Commit | Line | Data |
---|---|---|
d2876d08 DB |
1 | #include <linux/kernel.h> |
2 | #include <linux/module.h> | |
ff77c352 | 3 | #include <linux/interrupt.h> |
d2876d08 DB |
4 | #include <linux/irq.h> |
5 | #include <linux/spinlock.h> | |
1a989d0f | 6 | #include <linux/list.h> |
d8f388d8 DB |
7 | #include <linux/device.h> |
8 | #include <linux/err.h> | |
9 | #include <linux/debugfs.h> | |
10 | #include <linux/seq_file.h> | |
11 | #include <linux/gpio.h> | |
391c970c | 12 | #include <linux/of_gpio.h> |
ff77c352 | 13 | #include <linux/idr.h> |
5a0e3ad6 | 14 | #include <linux/slab.h> |
d2876d08 | 15 | |
3f397c21 UKK |
16 | #define CREATE_TRACE_POINTS |
17 | #include <trace/events/gpio.h> | |
d2876d08 | 18 | |
79a9becd | 19 | /* Implementation infrastructure for GPIO interfaces. |
d2876d08 | 20 | * |
79a9becd AC |
21 | * The GPIO programming interface allows for inlining speed-critical |
22 | * get/set operations for common cases, so that access to SOC-integrated | |
23 | * GPIOs can sometimes cost only an instruction or two per bit. | |
d2876d08 DB |
24 | */ |
25 | ||
26 | ||
27 | /* When debugging, extend minimal trust to callers and platform code. | |
28 | * Also emit diagnostic messages that may help initial bringup, when | |
29 | * board setup or driver bugs are most common. | |
30 | * | |
31 | * Otherwise, minimize overhead in what may be bitbanging codepaths. | |
32 | */ | |
33 | #ifdef DEBUG | |
34 | #define extra_checks 1 | |
35 | #else | |
36 | #define extra_checks 0 | |
37 | #endif | |
38 | ||
39 | /* gpio_lock prevents conflicts during gpio_desc[] table updates. | |
40 | * While any GPIO is requested, its gpio_chip is not removable; | |
41 | * each GPIO's "requested" flag serves as a lock and refcount. | |
42 | */ | |
43 | static DEFINE_SPINLOCK(gpio_lock); | |
44 | ||
45 | struct gpio_desc { | |
46 | struct gpio_chip *chip; | |
47 | unsigned long flags; | |
48 | /* flag symbols are bit numbers */ | |
49 | #define FLAG_REQUESTED 0 | |
50 | #define FLAG_IS_OUT 1 | |
710b40ea AC |
51 | #define FLAG_EXPORT 2 /* protected by sysfs_lock */ |
52 | #define FLAG_SYSFS 3 /* exported via /sys/class/gpio/control */ | |
53 | #define FLAG_TRIG_FALL 4 /* trigger on falling edge */ | |
54 | #define FLAG_TRIG_RISE 5 /* trigger on rising edge */ | |
79a9becd | 55 | #define FLAG_ACTIVE_LOW 6 /* value has active low */ |
710b40ea AC |
56 | #define FLAG_OPEN_DRAIN 7 /* Gpio is open drain type */ |
57 | #define FLAG_OPEN_SOURCE 8 /* Gpio is open source type */ | |
d468bf9e | 58 | #define FLAG_USED_AS_IRQ 9 /* GPIO is connected to an IRQ */ |
ff77c352 | 59 | |
5ba1821d | 60 | #define ID_SHIFT 16 /* add new flags before this one */ |
ff77c352 | 61 | |
5ba1821d | 62 | #define GPIO_FLAGS_MASK ((1 << ID_SHIFT) - 1) |
ff77c352 | 63 | #define GPIO_TRIGGER_MASK (BIT(FLAG_TRIG_FALL) | BIT(FLAG_TRIG_RISE)) |
d2876d08 DB |
64 | |
65 | #ifdef CONFIG_DEBUG_FS | |
66 | const char *label; | |
67 | #endif | |
68 | }; | |
69 | static struct gpio_desc gpio_desc[ARCH_NR_GPIOS]; | |
70 | ||
6c0b4e6c AC |
71 | #define GPIO_OFFSET_VALID(chip, offset) (offset >= 0 && offset < chip->ngpio) |
72 | ||
bae48da2 AC |
73 | static DEFINE_MUTEX(gpio_lookup_lock); |
74 | static LIST_HEAD(gpio_lookup_list); | |
1a989d0f AC |
75 | static LIST_HEAD(gpio_chips); |
76 | ||
ff77c352 | 77 | #ifdef CONFIG_GPIO_SYSFS |
5ba1821d | 78 | static DEFINE_IDR(dirent_idr); |
ff77c352 DG |
79 | #endif |
80 | ||
372e722e AC |
81 | static int gpiod_request(struct gpio_desc *desc, const char *label); |
82 | static void gpiod_free(struct gpio_desc *desc); | |
372e722e | 83 | |
7b17b59f MB |
84 | #ifdef CONFIG_DEBUG_FS |
85 | #define gpiod_emerg(desc, fmt, ...) \ | |
86 | pr_emerg("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label, \ | |
87 | ##__VA_ARGS__) | |
88 | #define gpiod_crit(desc, fmt, ...) \ | |
89 | pr_crit("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label, \ | |
90 | ##__VA_ARGS__) | |
91 | #define gpiod_err(desc, fmt, ...) \ | |
92 | pr_err("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label, \ | |
93 | ##__VA_ARGS__) | |
94 | #define gpiod_warn(desc, fmt, ...) \ | |
95 | pr_warn("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label, \ | |
96 | ##__VA_ARGS__) | |
97 | #define gpiod_info(desc, fmt, ...) \ | |
98 | pr_info("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label, \ | |
99 | ##__VA_ARGS__) | |
100 | #define gpiod_dbg(desc, fmt, ...) \ | |
101 | pr_debug("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label, \ | |
102 | ##__VA_ARGS__) | |
103 | #else | |
6424de5a MB |
104 | #define gpiod_emerg(desc, fmt, ...) \ |
105 | pr_emerg("gpio-%d: " fmt, desc_to_gpio(desc), ##__VA_ARGS__) | |
106 | #define gpiod_crit(desc, fmt, ...) \ | |
107 | pr_crit("gpio-%d: " fmt, desc_to_gpio(desc), ##__VA_ARGS__) | |
108 | #define gpiod_err(desc, fmt, ...) \ | |
109 | pr_err("gpio-%d: " fmt, desc_to_gpio(desc), ##__VA_ARGS__) | |
110 | #define gpiod_warn(desc, fmt, ...) \ | |
111 | pr_warn("gpio-%d: " fmt, desc_to_gpio(desc), ##__VA_ARGS__) | |
112 | #define gpiod_info(desc, fmt, ...) \ | |
113 | pr_info("gpio-%d: " fmt, desc_to_gpio(desc), ##__VA_ARGS__) | |
114 | #define gpiod_dbg(desc, fmt, ...) \ | |
115 | pr_debug("gpio-%d: " fmt, desc_to_gpio(desc), ##__VA_ARGS__) | |
7b17b59f | 116 | #endif |
372e722e | 117 | |
d2876d08 DB |
118 | static inline void desc_set_label(struct gpio_desc *d, const char *label) |
119 | { | |
120 | #ifdef CONFIG_DEBUG_FS | |
121 | d->label = label; | |
122 | #endif | |
123 | } | |
124 | ||
372e722e AC |
125 | /* |
126 | * Return the GPIO number of the passed descriptor relative to its chip | |
127 | */ | |
128 | static int gpio_chip_hwgpio(const struct gpio_desc *desc) | |
129 | { | |
6c0b4e6c | 130 | return desc - &desc->chip->desc[0]; |
372e722e AC |
131 | } |
132 | ||
133 | /** | |
134 | * Convert a GPIO number to its descriptor | |
135 | */ | |
79a9becd | 136 | struct gpio_desc *gpio_to_desc(unsigned gpio) |
372e722e AC |
137 | { |
138 | if (WARN(!gpio_is_valid(gpio), "invalid GPIO %d\n", gpio)) | |
139 | return NULL; | |
140 | else | |
141 | return &gpio_desc[gpio]; | |
142 | } | |
79a9becd | 143 | EXPORT_SYMBOL_GPL(gpio_to_desc); |
372e722e | 144 | |
d468bf9e LW |
145 | /** |
146 | * Convert an offset on a certain chip to a corresponding descriptor | |
147 | */ | |
148 | static struct gpio_desc *gpiochip_offset_to_desc(struct gpio_chip *chip, | |
149 | unsigned int offset) | |
150 | { | |
151 | unsigned int gpio = chip->base + offset; | |
152 | ||
153 | return gpio_to_desc(gpio); | |
154 | } | |
155 | ||
372e722e AC |
156 | /** |
157 | * Convert a GPIO descriptor to the integer namespace. | |
158 | * This should disappear in the future but is needed since we still | |
159 | * use GPIO numbers for error messages and sysfs nodes | |
160 | */ | |
79a9becd | 161 | int desc_to_gpio(const struct gpio_desc *desc) |
372e722e | 162 | { |
8c0fca81 | 163 | return desc - &gpio_desc[0]; |
372e722e | 164 | } |
79a9becd | 165 | EXPORT_SYMBOL_GPL(desc_to_gpio); |
372e722e AC |
166 | |
167 | ||
d2876d08 DB |
168 | /* Warn when drivers omit gpio_request() calls -- legal but ill-advised |
169 | * when setting direction, and otherwise illegal. Until board setup code | |
170 | * and drivers use explicit requests everywhere (which won't happen when | |
171 | * those calls have no teeth) we can't avoid autorequesting. This nag | |
35e8bb51 DB |
172 | * message should motivate switching to explicit requests... so should |
173 | * the weaker cleanup after faults, compared to gpio_request(). | |
8a0cecff DB |
174 | * |
175 | * NOTE: the autorequest mechanism is going away; at this point it's | |
176 | * only "legal" in the sense that (old) code using it won't break yet, | |
177 | * but instead only triggers a WARN() stack dump. | |
d2876d08 | 178 | */ |
372e722e | 179 | static int gpio_ensure_requested(struct gpio_desc *desc) |
d2876d08 | 180 | { |
8a0cecff | 181 | const struct gpio_chip *chip = desc->chip; |
372e722e | 182 | const int gpio = desc_to_gpio(desc); |
35e8bb51 | 183 | |
8a0cecff DB |
184 | if (WARN(test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0, |
185 | "autorequest GPIO-%d\n", gpio)) { | |
35e8bb51 DB |
186 | if (!try_module_get(chip->owner)) { |
187 | pr_err("GPIO-%d: module can't be gotten \n", gpio); | |
188 | clear_bit(FLAG_REQUESTED, &desc->flags); | |
189 | /* lose */ | |
190 | return -EIO; | |
191 | } | |
d2876d08 | 192 | desc_set_label(desc, "[auto]"); |
35e8bb51 DB |
193 | /* caller must chip->request() w/o spinlock */ |
194 | if (chip->request) | |
195 | return 1; | |
d2876d08 | 196 | } |
35e8bb51 | 197 | return 0; |
d2876d08 DB |
198 | } |
199 | ||
79a9becd AC |
200 | /** |
201 | * gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs | |
202 | * @desc: descriptor to return the chip of | |
203 | */ | |
204 | struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc) | |
372e722e | 205 | { |
bcabdef1 | 206 | return desc ? desc->chip : NULL; |
372e722e | 207 | } |
79a9becd | 208 | EXPORT_SYMBOL_GPL(gpiod_to_chip); |
d2876d08 | 209 | |
8d0aab2f AV |
210 | /* dynamic allocation of GPIOs, e.g. on a hotplugged device */ |
211 | static int gpiochip_find_base(int ngpio) | |
212 | { | |
83cabe33 AC |
213 | struct gpio_chip *chip; |
214 | int base = ARCH_NR_GPIOS - ngpio; | |
8d0aab2f | 215 | |
83cabe33 AC |
216 | list_for_each_entry_reverse(chip, &gpio_chips, list) { |
217 | /* found a free space? */ | |
218 | if (chip->base + chip->ngpio <= base) | |
219 | break; | |
220 | else | |
221 | /* nope, check the space right before the chip */ | |
222 | base = chip->base - ngpio; | |
8d0aab2f AV |
223 | } |
224 | ||
83cabe33 | 225 | if (gpio_is_valid(base)) { |
8d0aab2f | 226 | pr_debug("%s: found new base at %d\n", __func__, base); |
83cabe33 AC |
227 | return base; |
228 | } else { | |
229 | pr_err("%s: cannot find free range\n", __func__); | |
230 | return -ENOSPC; | |
169b6a7a | 231 | } |
169b6a7a AV |
232 | } |
233 | ||
79a9becd AC |
234 | /** |
235 | * gpiod_get_direction - return the current direction of a GPIO | |
236 | * @desc: GPIO to get the direction of | |
237 | * | |
238 | * Return GPIOF_DIR_IN or GPIOF_DIR_OUT, or an error code in case of error. | |
239 | * | |
240 | * This function may sleep if gpiod_cansleep() is true. | |
241 | */ | |
242 | int gpiod_get_direction(const struct gpio_desc *desc) | |
80b0a602 MN |
243 | { |
244 | struct gpio_chip *chip; | |
372e722e | 245 | unsigned offset; |
80b0a602 MN |
246 | int status = -EINVAL; |
247 | ||
372e722e AC |
248 | chip = gpiod_to_chip(desc); |
249 | offset = gpio_chip_hwgpio(desc); | |
80b0a602 MN |
250 | |
251 | if (!chip->get_direction) | |
252 | return status; | |
253 | ||
372e722e | 254 | status = chip->get_direction(chip, offset); |
80b0a602 MN |
255 | if (status > 0) { |
256 | /* GPIOF_DIR_IN, or other positive */ | |
257 | status = 1; | |
def63433 AC |
258 | /* FLAG_IS_OUT is just a cache of the result of get_direction(), |
259 | * so it does not affect constness per se */ | |
260 | clear_bit(FLAG_IS_OUT, &((struct gpio_desc *)desc)->flags); | |
80b0a602 MN |
261 | } |
262 | if (status == 0) { | |
263 | /* GPIOF_DIR_OUT */ | |
def63433 | 264 | set_bit(FLAG_IS_OUT, &((struct gpio_desc *)desc)->flags); |
80b0a602 MN |
265 | } |
266 | return status; | |
267 | } | |
79a9becd | 268 | EXPORT_SYMBOL_GPL(gpiod_get_direction); |
80b0a602 | 269 | |
d8f388d8 DB |
270 | #ifdef CONFIG_GPIO_SYSFS |
271 | ||
272 | /* lock protects against unexport_gpio() being called while | |
273 | * sysfs files are active. | |
274 | */ | |
275 | static DEFINE_MUTEX(sysfs_lock); | |
276 | ||
277 | /* | |
278 | * /sys/class/gpio/gpioN... only for GPIOs that are exported | |
279 | * /direction | |
280 | * * MAY BE OMITTED if kernel won't allow direction changes | |
281 | * * is read/write as "in" or "out" | |
282 | * * may also be written as "high" or "low", initializing | |
283 | * output value as specified ("out" implies "low") | |
284 | * /value | |
285 | * * always readable, subject to hardware behavior | |
286 | * * may be writable, as zero/nonzero | |
ff77c352 DG |
287 | * /edge |
288 | * * configures behavior of poll(2) on /value | |
289 | * * available only if pin can generate IRQs on input | |
290 | * * is read/write as "none", "falling", "rising", or "both" | |
07697461 JN |
291 | * /active_low |
292 | * * configures polarity of /value | |
293 | * * is read/write as zero/nonzero | |
294 | * * also affects existing and subsequent "falling" and "rising" | |
295 | * /edge configuration | |
d8f388d8 DB |
296 | */ |
297 | ||
298 | static ssize_t gpio_direction_show(struct device *dev, | |
299 | struct device_attribute *attr, char *buf) | |
300 | { | |
def63433 | 301 | const struct gpio_desc *desc = dev_get_drvdata(dev); |
d8f388d8 DB |
302 | ssize_t status; |
303 | ||
304 | mutex_lock(&sysfs_lock); | |
305 | ||
476171ce | 306 | if (!test_bit(FLAG_EXPORT, &desc->flags)) { |
d8f388d8 | 307 | status = -EIO; |
476171ce | 308 | } else { |
372e722e | 309 | gpiod_get_direction(desc); |
d8f388d8 DB |
310 | status = sprintf(buf, "%s\n", |
311 | test_bit(FLAG_IS_OUT, &desc->flags) | |
312 | ? "out" : "in"); | |
476171ce | 313 | } |
d8f388d8 DB |
314 | |
315 | mutex_unlock(&sysfs_lock); | |
316 | return status; | |
317 | } | |
318 | ||
319 | static ssize_t gpio_direction_store(struct device *dev, | |
320 | struct device_attribute *attr, const char *buf, size_t size) | |
321 | { | |
372e722e | 322 | struct gpio_desc *desc = dev_get_drvdata(dev); |
d8f388d8 DB |
323 | ssize_t status; |
324 | ||
325 | mutex_lock(&sysfs_lock); | |
326 | ||
327 | if (!test_bit(FLAG_EXPORT, &desc->flags)) | |
328 | status = -EIO; | |
329 | else if (sysfs_streq(buf, "high")) | |
372e722e | 330 | status = gpiod_direction_output(desc, 1); |
d8f388d8 | 331 | else if (sysfs_streq(buf, "out") || sysfs_streq(buf, "low")) |
372e722e | 332 | status = gpiod_direction_output(desc, 0); |
d8f388d8 | 333 | else if (sysfs_streq(buf, "in")) |
372e722e | 334 | status = gpiod_direction_input(desc); |
d8f388d8 DB |
335 | else |
336 | status = -EINVAL; | |
337 | ||
338 | mutex_unlock(&sysfs_lock); | |
339 | return status ? : size; | |
340 | } | |
341 | ||
07697461 | 342 | static /* const */ DEVICE_ATTR(direction, 0644, |
d8f388d8 DB |
343 | gpio_direction_show, gpio_direction_store); |
344 | ||
345 | static ssize_t gpio_value_show(struct device *dev, | |
346 | struct device_attribute *attr, char *buf) | |
347 | { | |
372e722e | 348 | struct gpio_desc *desc = dev_get_drvdata(dev); |
d8f388d8 DB |
349 | ssize_t status; |
350 | ||
351 | mutex_lock(&sysfs_lock); | |
352 | ||
79a9becd | 353 | if (!test_bit(FLAG_EXPORT, &desc->flags)) |
d8f388d8 | 354 | status = -EIO; |
79a9becd AC |
355 | else |
356 | status = sprintf(buf, "%d\n", gpiod_get_value_cansleep(desc)); | |
d8f388d8 DB |
357 | |
358 | mutex_unlock(&sysfs_lock); | |
359 | return status; | |
360 | } | |
361 | ||
362 | static ssize_t gpio_value_store(struct device *dev, | |
363 | struct device_attribute *attr, const char *buf, size_t size) | |
364 | { | |
372e722e | 365 | struct gpio_desc *desc = dev_get_drvdata(dev); |
d8f388d8 DB |
366 | ssize_t status; |
367 | ||
368 | mutex_lock(&sysfs_lock); | |
369 | ||
370 | if (!test_bit(FLAG_EXPORT, &desc->flags)) | |
371 | status = -EIO; | |
372 | else if (!test_bit(FLAG_IS_OUT, &desc->flags)) | |
373 | status = -EPERM; | |
374 | else { | |
375 | long value; | |
376 | ||
a3d88c92 | 377 | status = kstrtol(buf, 0, &value); |
d8f388d8 | 378 | if (status == 0) { |
79a9becd | 379 | gpiod_set_value_cansleep(desc, value); |
d8f388d8 DB |
380 | status = size; |
381 | } | |
382 | } | |
383 | ||
384 | mutex_unlock(&sysfs_lock); | |
385 | return status; | |
386 | } | |
387 | ||
07697461 | 388 | static const DEVICE_ATTR(value, 0644, |
d8f388d8 DB |
389 | gpio_value_show, gpio_value_store); |
390 | ||
ff77c352 DG |
391 | static irqreturn_t gpio_sysfs_irq(int irq, void *priv) |
392 | { | |
5ba1821d | 393 | struct sysfs_dirent *value_sd = priv; |
ff77c352 | 394 | |
5ba1821d | 395 | sysfs_notify_dirent(value_sd); |
ff77c352 DG |
396 | return IRQ_HANDLED; |
397 | } | |
398 | ||
ff77c352 DG |
399 | static int gpio_setup_irq(struct gpio_desc *desc, struct device *dev, |
400 | unsigned long gpio_flags) | |
401 | { | |
5ba1821d | 402 | struct sysfs_dirent *value_sd; |
ff77c352 DG |
403 | unsigned long irq_flags; |
404 | int ret, irq, id; | |
405 | ||
406 | if ((desc->flags & GPIO_TRIGGER_MASK) == gpio_flags) | |
407 | return 0; | |
408 | ||
372e722e | 409 | irq = gpiod_to_irq(desc); |
ff77c352 DG |
410 | if (irq < 0) |
411 | return -EIO; | |
412 | ||
5ba1821d DG |
413 | id = desc->flags >> ID_SHIFT; |
414 | value_sd = idr_find(&dirent_idr, id); | |
415 | if (value_sd) | |
416 | free_irq(irq, value_sd); | |
ff77c352 DG |
417 | |
418 | desc->flags &= ~GPIO_TRIGGER_MASK; | |
419 | ||
420 | if (!gpio_flags) { | |
d468bf9e | 421 | gpiod_unlock_as_irq(desc); |
ff77c352 | 422 | ret = 0; |
5ba1821d | 423 | goto free_id; |
ff77c352 DG |
424 | } |
425 | ||
426 | irq_flags = IRQF_SHARED; | |
427 | if (test_bit(FLAG_TRIG_FALL, &gpio_flags)) | |
07697461 JN |
428 | irq_flags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ? |
429 | IRQF_TRIGGER_RISING : IRQF_TRIGGER_FALLING; | |
ff77c352 | 430 | if (test_bit(FLAG_TRIG_RISE, &gpio_flags)) |
07697461 JN |
431 | irq_flags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ? |
432 | IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING; | |
ff77c352 | 433 | |
5ba1821d DG |
434 | if (!value_sd) { |
435 | value_sd = sysfs_get_dirent(dev->kobj.sd, NULL, "value"); | |
436 | if (!value_sd) { | |
437 | ret = -ENODEV; | |
ff77c352 DG |
438 | goto err_out; |
439 | } | |
440 | ||
62f516b8 TH |
441 | ret = idr_alloc(&dirent_idr, value_sd, 1, 0, GFP_KERNEL); |
442 | if (ret < 0) | |
5ba1821d | 443 | goto free_sd; |
62f516b8 | 444 | id = ret; |
ff77c352 DG |
445 | |
446 | desc->flags &= GPIO_FLAGS_MASK; | |
5ba1821d | 447 | desc->flags |= (unsigned long)id << ID_SHIFT; |
ff77c352 | 448 | |
5ba1821d | 449 | if (desc->flags >> ID_SHIFT != id) { |
ff77c352 DG |
450 | ret = -ERANGE; |
451 | goto free_id; | |
452 | } | |
ff77c352 DG |
453 | } |
454 | ||
364fadb3 | 455 | ret = request_any_context_irq(irq, gpio_sysfs_irq, irq_flags, |
5ba1821d | 456 | "gpiolib", value_sd); |
364fadb3 | 457 | if (ret < 0) |
5ba1821d | 458 | goto free_id; |
ff77c352 | 459 | |
d468bf9e LW |
460 | ret = gpiod_lock_as_irq(desc); |
461 | if (ret < 0) { | |
462 | gpiod_warn(desc, "failed to flag the GPIO for IRQ\n"); | |
463 | goto free_id; | |
464 | } | |
465 | ||
ff77c352 DG |
466 | desc->flags |= gpio_flags; |
467 | return 0; | |
468 | ||
ff77c352 | 469 | free_id: |
5ba1821d | 470 | idr_remove(&dirent_idr, id); |
ff77c352 | 471 | desc->flags &= GPIO_FLAGS_MASK; |
5ba1821d DG |
472 | free_sd: |
473 | if (value_sd) | |
474 | sysfs_put(value_sd); | |
ff77c352 DG |
475 | err_out: |
476 | return ret; | |
477 | } | |
478 | ||
479 | static const struct { | |
480 | const char *name; | |
481 | unsigned long flags; | |
482 | } trigger_types[] = { | |
483 | { "none", 0 }, | |
484 | { "falling", BIT(FLAG_TRIG_FALL) }, | |
485 | { "rising", BIT(FLAG_TRIG_RISE) }, | |
486 | { "both", BIT(FLAG_TRIG_FALL) | BIT(FLAG_TRIG_RISE) }, | |
487 | }; | |
488 | ||
489 | static ssize_t gpio_edge_show(struct device *dev, | |
490 | struct device_attribute *attr, char *buf) | |
491 | { | |
492 | const struct gpio_desc *desc = dev_get_drvdata(dev); | |
493 | ssize_t status; | |
494 | ||
495 | mutex_lock(&sysfs_lock); | |
496 | ||
497 | if (!test_bit(FLAG_EXPORT, &desc->flags)) | |
498 | status = -EIO; | |
499 | else { | |
500 | int i; | |
501 | ||
502 | status = 0; | |
503 | for (i = 0; i < ARRAY_SIZE(trigger_types); i++) | |
504 | if ((desc->flags & GPIO_TRIGGER_MASK) | |
505 | == trigger_types[i].flags) { | |
506 | status = sprintf(buf, "%s\n", | |
507 | trigger_types[i].name); | |
508 | break; | |
509 | } | |
510 | } | |
511 | ||
512 | mutex_unlock(&sysfs_lock); | |
513 | return status; | |
514 | } | |
515 | ||
516 | static ssize_t gpio_edge_store(struct device *dev, | |
517 | struct device_attribute *attr, const char *buf, size_t size) | |
518 | { | |
519 | struct gpio_desc *desc = dev_get_drvdata(dev); | |
520 | ssize_t status; | |
521 | int i; | |
522 | ||
523 | for (i = 0; i < ARRAY_SIZE(trigger_types); i++) | |
524 | if (sysfs_streq(trigger_types[i].name, buf)) | |
525 | goto found; | |
526 | return -EINVAL; | |
527 | ||
528 | found: | |
529 | mutex_lock(&sysfs_lock); | |
530 | ||
531 | if (!test_bit(FLAG_EXPORT, &desc->flags)) | |
532 | status = -EIO; | |
533 | else { | |
534 | status = gpio_setup_irq(desc, dev, trigger_types[i].flags); | |
535 | if (!status) | |
536 | status = size; | |
537 | } | |
538 | ||
539 | mutex_unlock(&sysfs_lock); | |
540 | ||
541 | return status; | |
542 | } | |
543 | ||
544 | static DEVICE_ATTR(edge, 0644, gpio_edge_show, gpio_edge_store); | |
545 | ||
07697461 JN |
546 | static int sysfs_set_active_low(struct gpio_desc *desc, struct device *dev, |
547 | int value) | |
548 | { | |
549 | int status = 0; | |
550 | ||
551 | if (!!test_bit(FLAG_ACTIVE_LOW, &desc->flags) == !!value) | |
552 | return 0; | |
553 | ||
554 | if (value) | |
555 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
556 | else | |
557 | clear_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
558 | ||
559 | /* reconfigure poll(2) support if enabled on one edge only */ | |
560 | if (dev != NULL && (!!test_bit(FLAG_TRIG_RISE, &desc->flags) ^ | |
561 | !!test_bit(FLAG_TRIG_FALL, &desc->flags))) { | |
562 | unsigned long trigger_flags = desc->flags & GPIO_TRIGGER_MASK; | |
563 | ||
564 | gpio_setup_irq(desc, dev, 0); | |
565 | status = gpio_setup_irq(desc, dev, trigger_flags); | |
566 | } | |
567 | ||
568 | return status; | |
569 | } | |
570 | ||
571 | static ssize_t gpio_active_low_show(struct device *dev, | |
572 | struct device_attribute *attr, char *buf) | |
573 | { | |
574 | const struct gpio_desc *desc = dev_get_drvdata(dev); | |
575 | ssize_t status; | |
576 | ||
577 | mutex_lock(&sysfs_lock); | |
578 | ||
579 | if (!test_bit(FLAG_EXPORT, &desc->flags)) | |
580 | status = -EIO; | |
581 | else | |
582 | status = sprintf(buf, "%d\n", | |
583 | !!test_bit(FLAG_ACTIVE_LOW, &desc->flags)); | |
584 | ||
585 | mutex_unlock(&sysfs_lock); | |
586 | ||
587 | return status; | |
588 | } | |
589 | ||
590 | static ssize_t gpio_active_low_store(struct device *dev, | |
591 | struct device_attribute *attr, const char *buf, size_t size) | |
592 | { | |
593 | struct gpio_desc *desc = dev_get_drvdata(dev); | |
594 | ssize_t status; | |
595 | ||
596 | mutex_lock(&sysfs_lock); | |
597 | ||
598 | if (!test_bit(FLAG_EXPORT, &desc->flags)) { | |
599 | status = -EIO; | |
600 | } else { | |
601 | long value; | |
602 | ||
a3d88c92 | 603 | status = kstrtol(buf, 0, &value); |
07697461 JN |
604 | if (status == 0) |
605 | status = sysfs_set_active_low(desc, dev, value != 0); | |
606 | } | |
607 | ||
608 | mutex_unlock(&sysfs_lock); | |
609 | ||
610 | return status ? : size; | |
611 | } | |
612 | ||
613 | static const DEVICE_ATTR(active_low, 0644, | |
614 | gpio_active_low_show, gpio_active_low_store); | |
615 | ||
d8f388d8 | 616 | static const struct attribute *gpio_attrs[] = { |
d8f388d8 | 617 | &dev_attr_value.attr, |
07697461 | 618 | &dev_attr_active_low.attr, |
d8f388d8 DB |
619 | NULL, |
620 | }; | |
621 | ||
622 | static const struct attribute_group gpio_attr_group = { | |
623 | .attrs = (struct attribute **) gpio_attrs, | |
624 | }; | |
625 | ||
626 | /* | |
627 | * /sys/class/gpio/gpiochipN/ | |
628 | * /base ... matching gpio_chip.base (N) | |
629 | * /label ... matching gpio_chip.label | |
630 | * /ngpio ... matching gpio_chip.ngpio | |
631 | */ | |
632 | ||
633 | static ssize_t chip_base_show(struct device *dev, | |
634 | struct device_attribute *attr, char *buf) | |
635 | { | |
636 | const struct gpio_chip *chip = dev_get_drvdata(dev); | |
637 | ||
638 | return sprintf(buf, "%d\n", chip->base); | |
639 | } | |
640 | static DEVICE_ATTR(base, 0444, chip_base_show, NULL); | |
641 | ||
642 | static ssize_t chip_label_show(struct device *dev, | |
643 | struct device_attribute *attr, char *buf) | |
644 | { | |
645 | const struct gpio_chip *chip = dev_get_drvdata(dev); | |
646 | ||
647 | return sprintf(buf, "%s\n", chip->label ? : ""); | |
648 | } | |
649 | static DEVICE_ATTR(label, 0444, chip_label_show, NULL); | |
650 | ||
651 | static ssize_t chip_ngpio_show(struct device *dev, | |
652 | struct device_attribute *attr, char *buf) | |
653 | { | |
654 | const struct gpio_chip *chip = dev_get_drvdata(dev); | |
655 | ||
656 | return sprintf(buf, "%u\n", chip->ngpio); | |
657 | } | |
658 | static DEVICE_ATTR(ngpio, 0444, chip_ngpio_show, NULL); | |
659 | ||
660 | static const struct attribute *gpiochip_attrs[] = { | |
661 | &dev_attr_base.attr, | |
662 | &dev_attr_label.attr, | |
663 | &dev_attr_ngpio.attr, | |
664 | NULL, | |
665 | }; | |
666 | ||
667 | static const struct attribute_group gpiochip_attr_group = { | |
668 | .attrs = (struct attribute **) gpiochip_attrs, | |
669 | }; | |
670 | ||
671 | /* | |
672 | * /sys/class/gpio/export ... write-only | |
673 | * integer N ... number of GPIO to export (full access) | |
674 | * /sys/class/gpio/unexport ... write-only | |
675 | * integer N ... number of GPIO to unexport | |
676 | */ | |
28812fe1 AK |
677 | static ssize_t export_store(struct class *class, |
678 | struct class_attribute *attr, | |
679 | const char *buf, size_t len) | |
d8f388d8 | 680 | { |
372e722e AC |
681 | long gpio; |
682 | struct gpio_desc *desc; | |
683 | int status; | |
d8f388d8 | 684 | |
a3d88c92 | 685 | status = kstrtol(buf, 0, &gpio); |
d8f388d8 DB |
686 | if (status < 0) |
687 | goto done; | |
688 | ||
372e722e | 689 | desc = gpio_to_desc(gpio); |
bcabdef1 AC |
690 | /* reject invalid GPIOs */ |
691 | if (!desc) { | |
692 | pr_warn("%s: invalid GPIO %ld\n", __func__, gpio); | |
693 | return -EINVAL; | |
694 | } | |
372e722e | 695 | |
d8f388d8 DB |
696 | /* No extra locking here; FLAG_SYSFS just signifies that the |
697 | * request and export were done by on behalf of userspace, so | |
698 | * they may be undone on its behalf too. | |
699 | */ | |
700 | ||
372e722e | 701 | status = gpiod_request(desc, "sysfs"); |
ad2fab36 MN |
702 | if (status < 0) { |
703 | if (status == -EPROBE_DEFER) | |
704 | status = -ENODEV; | |
d8f388d8 | 705 | goto done; |
ad2fab36 | 706 | } |
372e722e | 707 | status = gpiod_export(desc, true); |
d8f388d8 | 708 | if (status < 0) |
372e722e | 709 | gpiod_free(desc); |
d8f388d8 | 710 | else |
372e722e | 711 | set_bit(FLAG_SYSFS, &desc->flags); |
d8f388d8 DB |
712 | |
713 | done: | |
714 | if (status) | |
715 | pr_debug("%s: status %d\n", __func__, status); | |
716 | return status ? : len; | |
717 | } | |
718 | ||
28812fe1 AK |
719 | static ssize_t unexport_store(struct class *class, |
720 | struct class_attribute *attr, | |
721 | const char *buf, size_t len) | |
d8f388d8 | 722 | { |
372e722e AC |
723 | long gpio; |
724 | struct gpio_desc *desc; | |
725 | int status; | |
d8f388d8 | 726 | |
a3d88c92 | 727 | status = kstrtol(buf, 0, &gpio); |
d8f388d8 DB |
728 | if (status < 0) |
729 | goto done; | |
730 | ||
372e722e | 731 | desc = gpio_to_desc(gpio); |
d8f388d8 | 732 | /* reject bogus commands (gpio_unexport ignores them) */ |
bcabdef1 AC |
733 | if (!desc) { |
734 | pr_warn("%s: invalid GPIO %ld\n", __func__, gpio); | |
735 | return -EINVAL; | |
736 | } | |
737 | ||
738 | status = -EINVAL; | |
d8f388d8 DB |
739 | |
740 | /* No extra locking here; FLAG_SYSFS just signifies that the | |
741 | * request and export were done by on behalf of userspace, so | |
742 | * they may be undone on its behalf too. | |
743 | */ | |
372e722e | 744 | if (test_and_clear_bit(FLAG_SYSFS, &desc->flags)) { |
d8f388d8 | 745 | status = 0; |
372e722e | 746 | gpiod_free(desc); |
d8f388d8 DB |
747 | } |
748 | done: | |
749 | if (status) | |
750 | pr_debug("%s: status %d\n", __func__, status); | |
751 | return status ? : len; | |
752 | } | |
753 | ||
754 | static struct class_attribute gpio_class_attrs[] = { | |
755 | __ATTR(export, 0200, NULL, export_store), | |
756 | __ATTR(unexport, 0200, NULL, unexport_store), | |
757 | __ATTR_NULL, | |
758 | }; | |
759 | ||
760 | static struct class gpio_class = { | |
761 | .name = "gpio", | |
762 | .owner = THIS_MODULE, | |
763 | ||
764 | .class_attrs = gpio_class_attrs, | |
765 | }; | |
766 | ||
767 | ||
768 | /** | |
79a9becd | 769 | * gpiod_export - export a GPIO through sysfs |
d8f388d8 DB |
770 | * @gpio: gpio to make available, already requested |
771 | * @direction_may_change: true if userspace may change gpio direction | |
772 | * Context: arch_initcall or later | |
773 | * | |
774 | * When drivers want to make a GPIO accessible to userspace after they | |
775 | * have requested it -- perhaps while debugging, or as part of their | |
776 | * public interface -- they may use this routine. If the GPIO can | |
777 | * change direction (some can't) and the caller allows it, userspace | |
778 | * will see "direction" sysfs attribute which may be used to change | |
779 | * the gpio's direction. A "value" attribute will always be provided. | |
780 | * | |
781 | * Returns zero on success, else an error. | |
782 | */ | |
79a9becd | 783 | int gpiod_export(struct gpio_desc *desc, bool direction_may_change) |
d8f388d8 DB |
784 | { |
785 | unsigned long flags; | |
fc4e2514 | 786 | int status; |
62154991 | 787 | const char *ioname = NULL; |
fc4e2514 | 788 | struct device *dev; |
372e722e | 789 | int offset; |
d8f388d8 DB |
790 | |
791 | /* can't export until sysfs is available ... */ | |
792 | if (!gpio_class.p) { | |
793 | pr_debug("%s: called too early!\n", __func__); | |
794 | return -ENOENT; | |
795 | } | |
796 | ||
372e722e AC |
797 | if (!desc) { |
798 | pr_debug("%s: invalid gpio descriptor\n", __func__); | |
fc4e2514 RM |
799 | return -EINVAL; |
800 | } | |
d8f388d8 DB |
801 | |
802 | mutex_lock(&sysfs_lock); | |
803 | ||
804 | spin_lock_irqsave(&gpio_lock, flags); | |
fc4e2514 RM |
805 | if (!test_bit(FLAG_REQUESTED, &desc->flags) || |
806 | test_bit(FLAG_EXPORT, &desc->flags)) { | |
807 | spin_unlock_irqrestore(&gpio_lock, flags); | |
808 | pr_debug("%s: gpio %d unavailable (requested=%d, exported=%d)\n", | |
372e722e | 809 | __func__, desc_to_gpio(desc), |
fc4e2514 RM |
810 | test_bit(FLAG_REQUESTED, &desc->flags), |
811 | test_bit(FLAG_EXPORT, &desc->flags)); | |
529f2ad5 DC |
812 | status = -EPERM; |
813 | goto fail_unlock; | |
d8f388d8 | 814 | } |
fc4e2514 RM |
815 | |
816 | if (!desc->chip->direction_input || !desc->chip->direction_output) | |
817 | direction_may_change = false; | |
d8f388d8 DB |
818 | spin_unlock_irqrestore(&gpio_lock, flags); |
819 | ||
372e722e AC |
820 | offset = gpio_chip_hwgpio(desc); |
821 | if (desc->chip->names && desc->chip->names[offset]) | |
822 | ioname = desc->chip->names[offset]; | |
926b663c | 823 | |
fc4e2514 | 824 | dev = device_create(&gpio_class, desc->chip->dev, MKDEV(0, 0), |
372e722e AC |
825 | desc, ioname ? ioname : "gpio%u", |
826 | desc_to_gpio(desc)); | |
fc4e2514 RM |
827 | if (IS_ERR(dev)) { |
828 | status = PTR_ERR(dev); | |
829 | goto fail_unlock; | |
d8f388d8 DB |
830 | } |
831 | ||
fc4e2514 | 832 | status = sysfs_create_group(&dev->kobj, &gpio_attr_group); |
d8f388d8 | 833 | if (status) |
fc4e2514 | 834 | goto fail_unregister_device; |
d8f388d8 | 835 | |
fc4e2514 RM |
836 | if (direction_may_change) { |
837 | status = device_create_file(dev, &dev_attr_direction); | |
838 | if (status) | |
839 | goto fail_unregister_device; | |
840 | } | |
841 | ||
372e722e | 842 | if (gpiod_to_irq(desc) >= 0 && (direction_may_change || |
fc4e2514 RM |
843 | !test_bit(FLAG_IS_OUT, &desc->flags))) { |
844 | status = device_create_file(dev, &dev_attr_edge); | |
845 | if (status) | |
846 | goto fail_unregister_device; | |
847 | } | |
d8f388d8 | 848 | |
fc4e2514 RM |
849 | set_bit(FLAG_EXPORT, &desc->flags); |
850 | mutex_unlock(&sysfs_lock); | |
851 | return 0; | |
852 | ||
853 | fail_unregister_device: | |
854 | device_unregister(dev); | |
855 | fail_unlock: | |
856 | mutex_unlock(&sysfs_lock); | |
372e722e AC |
857 | pr_debug("%s: gpio%d status %d\n", __func__, desc_to_gpio(desc), |
858 | status); | |
d8f388d8 DB |
859 | return status; |
860 | } | |
79a9becd | 861 | EXPORT_SYMBOL_GPL(gpiod_export); |
d8f388d8 | 862 | |
9f3b795a | 863 | static int match_export(struct device *dev, const void *data) |
d8f388d8 DB |
864 | { |
865 | return dev_get_drvdata(dev) == data; | |
866 | } | |
867 | ||
a4177ee7 | 868 | /** |
79a9becd | 869 | * gpiod_export_link - create a sysfs link to an exported GPIO node |
a4177ee7 JN |
870 | * @dev: device under which to create symlink |
871 | * @name: name of the symlink | |
872 | * @gpio: gpio to create symlink to, already exported | |
873 | * | |
874 | * Set up a symlink from /sys/.../dev/name to /sys/class/gpio/gpioN | |
875 | * node. Caller is responsible for unlinking. | |
876 | * | |
877 | * Returns zero on success, else an error. | |
878 | */ | |
79a9becd AC |
879 | int gpiod_export_link(struct device *dev, const char *name, |
880 | struct gpio_desc *desc) | |
a4177ee7 | 881 | { |
a4177ee7 JN |
882 | int status = -EINVAL; |
883 | ||
bcabdef1 AC |
884 | if (!desc) { |
885 | pr_warn("%s: invalid GPIO\n", __func__); | |
886 | return -EINVAL; | |
887 | } | |
a4177ee7 JN |
888 | |
889 | mutex_lock(&sysfs_lock); | |
890 | ||
a4177ee7 JN |
891 | if (test_bit(FLAG_EXPORT, &desc->flags)) { |
892 | struct device *tdev; | |
893 | ||
894 | tdev = class_find_device(&gpio_class, NULL, desc, match_export); | |
895 | if (tdev != NULL) { | |
896 | status = sysfs_create_link(&dev->kobj, &tdev->kobj, | |
897 | name); | |
898 | } else { | |
899 | status = -ENODEV; | |
900 | } | |
901 | } | |
902 | ||
903 | mutex_unlock(&sysfs_lock); | |
904 | ||
a4177ee7 | 905 | if (status) |
372e722e AC |
906 | pr_debug("%s: gpio%d status %d\n", __func__, desc_to_gpio(desc), |
907 | status); | |
a4177ee7 JN |
908 | |
909 | return status; | |
910 | } | |
79a9becd | 911 | EXPORT_SYMBOL_GPL(gpiod_export_link); |
07697461 JN |
912 | |
913 | /** | |
79a9becd | 914 | * gpiod_sysfs_set_active_low - set the polarity of gpio sysfs value |
07697461 JN |
915 | * @gpio: gpio to change |
916 | * @value: non-zero to use active low, i.e. inverted values | |
917 | * | |
918 | * Set the polarity of /sys/class/gpio/gpioN/value sysfs attribute. | |
919 | * The GPIO does not have to be exported yet. If poll(2) support has | |
920 | * been enabled for either rising or falling edge, it will be | |
921 | * reconfigured to follow the new polarity. | |
922 | * | |
923 | * Returns zero on success, else an error. | |
924 | */ | |
79a9becd | 925 | int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value) |
07697461 | 926 | { |
07697461 JN |
927 | struct device *dev = NULL; |
928 | int status = -EINVAL; | |
929 | ||
bcabdef1 AC |
930 | if (!desc) { |
931 | pr_warn("%s: invalid GPIO\n", __func__); | |
932 | return -EINVAL; | |
933 | } | |
07697461 JN |
934 | |
935 | mutex_lock(&sysfs_lock); | |
936 | ||
07697461 | 937 | if (test_bit(FLAG_EXPORT, &desc->flags)) { |
07697461 JN |
938 | dev = class_find_device(&gpio_class, NULL, desc, match_export); |
939 | if (dev == NULL) { | |
940 | status = -ENODEV; | |
941 | goto unlock; | |
942 | } | |
943 | } | |
944 | ||
945 | status = sysfs_set_active_low(desc, dev, value); | |
946 | ||
947 | unlock: | |
948 | mutex_unlock(&sysfs_lock); | |
949 | ||
07697461 | 950 | if (status) |
372e722e AC |
951 | pr_debug("%s: gpio%d status %d\n", __func__, desc_to_gpio(desc), |
952 | status); | |
07697461 JN |
953 | |
954 | return status; | |
955 | } | |
79a9becd | 956 | EXPORT_SYMBOL_GPL(gpiod_sysfs_set_active_low); |
07697461 | 957 | |
d8f388d8 | 958 | /** |
79a9becd | 959 | * gpiod_unexport - reverse effect of gpio_export() |
d8f388d8 DB |
960 | * @gpio: gpio to make unavailable |
961 | * | |
962 | * This is implicit on gpio_free(). | |
963 | */ | |
79a9becd | 964 | void gpiod_unexport(struct gpio_desc *desc) |
d8f388d8 | 965 | { |
6a99ad4a | 966 | int status = 0; |
864533ce | 967 | struct device *dev = NULL; |
d8f388d8 | 968 | |
372e722e | 969 | if (!desc) { |
bcabdef1 AC |
970 | pr_warn("%s: invalid GPIO\n", __func__); |
971 | return; | |
6a99ad4a | 972 | } |
d8f388d8 DB |
973 | |
974 | mutex_lock(&sysfs_lock); | |
975 | ||
d8f388d8 | 976 | if (test_bit(FLAG_EXPORT, &desc->flags)) { |
d8f388d8 DB |
977 | |
978 | dev = class_find_device(&gpio_class, NULL, desc, match_export); | |
979 | if (dev) { | |
ff77c352 | 980 | gpio_setup_irq(desc, dev, 0); |
d8f388d8 | 981 | clear_bit(FLAG_EXPORT, &desc->flags); |
d8f388d8 DB |
982 | } else |
983 | status = -ENODEV; | |
984 | } | |
985 | ||
986 | mutex_unlock(&sysfs_lock); | |
372e722e | 987 | |
864533ce ML |
988 | if (dev) { |
989 | device_unregister(dev); | |
990 | put_device(dev); | |
991 | } | |
bcabdef1 | 992 | |
d8f388d8 | 993 | if (status) |
372e722e AC |
994 | pr_debug("%s: gpio%d status %d\n", __func__, desc_to_gpio(desc), |
995 | status); | |
996 | } | |
79a9becd | 997 | EXPORT_SYMBOL_GPL(gpiod_unexport); |
d8f388d8 DB |
998 | |
999 | static int gpiochip_export(struct gpio_chip *chip) | |
1000 | { | |
1001 | int status; | |
1002 | struct device *dev; | |
1003 | ||
1004 | /* Many systems register gpio chips for SOC support very early, | |
1005 | * before driver model support is available. In those cases we | |
1006 | * export this later, in gpiolib_sysfs_init() ... here we just | |
1007 | * verify that _some_ field of gpio_class got initialized. | |
1008 | */ | |
1009 | if (!gpio_class.p) | |
1010 | return 0; | |
1011 | ||
1012 | /* use chip->base for the ID; it's already known to be unique */ | |
1013 | mutex_lock(&sysfs_lock); | |
1014 | dev = device_create(&gpio_class, chip->dev, MKDEV(0, 0), chip, | |
1015 | "gpiochip%d", chip->base); | |
d62668e1 | 1016 | if (!IS_ERR(dev)) { |
d8f388d8 DB |
1017 | status = sysfs_create_group(&dev->kobj, |
1018 | &gpiochip_attr_group); | |
1019 | } else | |
d62668e1 | 1020 | status = PTR_ERR(dev); |
d8f388d8 DB |
1021 | chip->exported = (status == 0); |
1022 | mutex_unlock(&sysfs_lock); | |
1023 | ||
1024 | if (status) { | |
1025 | unsigned long flags; | |
1026 | unsigned gpio; | |
1027 | ||
1028 | spin_lock_irqsave(&gpio_lock, flags); | |
6c0b4e6c AC |
1029 | gpio = 0; |
1030 | while (gpio < chip->ngpio) | |
1031 | chip->desc[gpio++].chip = NULL; | |
d8f388d8 DB |
1032 | spin_unlock_irqrestore(&gpio_lock, flags); |
1033 | ||
1034 | pr_debug("%s: chip %s status %d\n", __func__, | |
1035 | chip->label, status); | |
1036 | } | |
1037 | ||
1038 | return status; | |
1039 | } | |
1040 | ||
1041 | static void gpiochip_unexport(struct gpio_chip *chip) | |
1042 | { | |
1043 | int status; | |
1044 | struct device *dev; | |
1045 | ||
1046 | mutex_lock(&sysfs_lock); | |
1047 | dev = class_find_device(&gpio_class, NULL, chip, match_export); | |
1048 | if (dev) { | |
1049 | put_device(dev); | |
1050 | device_unregister(dev); | |
1051 | chip->exported = 0; | |
1052 | status = 0; | |
1053 | } else | |
1054 | status = -ENODEV; | |
1055 | mutex_unlock(&sysfs_lock); | |
1056 | ||
1057 | if (status) | |
1058 | pr_debug("%s: chip %s status %d\n", __func__, | |
1059 | chip->label, status); | |
1060 | } | |
1061 | ||
1062 | static int __init gpiolib_sysfs_init(void) | |
1063 | { | |
1064 | int status; | |
1065 | unsigned long flags; | |
65493e3a | 1066 | struct gpio_chip *chip; |
d8f388d8 DB |
1067 | |
1068 | status = class_register(&gpio_class); | |
1069 | if (status < 0) | |
1070 | return status; | |
1071 | ||
1072 | /* Scan and register the gpio_chips which registered very | |
1073 | * early (e.g. before the class_register above was called). | |
1074 | * | |
1075 | * We run before arch_initcall() so chip->dev nodes can have | |
1076 | * registered, and so arch_initcall() can always gpio_export(). | |
1077 | */ | |
1078 | spin_lock_irqsave(&gpio_lock, flags); | |
65493e3a | 1079 | list_for_each_entry(chip, &gpio_chips, list) { |
d8f388d8 DB |
1080 | if (!chip || chip->exported) |
1081 | continue; | |
1082 | ||
1083 | spin_unlock_irqrestore(&gpio_lock, flags); | |
1084 | status = gpiochip_export(chip); | |
1085 | spin_lock_irqsave(&gpio_lock, flags); | |
1086 | } | |
1087 | spin_unlock_irqrestore(&gpio_lock, flags); | |
1088 | ||
1089 | ||
1090 | return status; | |
1091 | } | |
1092 | postcore_initcall(gpiolib_sysfs_init); | |
1093 | ||
1094 | #else | |
1095 | static inline int gpiochip_export(struct gpio_chip *chip) | |
1096 | { | |
1097 | return 0; | |
1098 | } | |
1099 | ||
1100 | static inline void gpiochip_unexport(struct gpio_chip *chip) | |
1101 | { | |
1102 | } | |
1103 | ||
1104 | #endif /* CONFIG_GPIO_SYSFS */ | |
1105 | ||
1a989d0f AC |
1106 | /* |
1107 | * Add a new chip to the global chips list, keeping the list of chips sorted | |
1108 | * by base order. | |
1109 | * | |
1110 | * Return -EBUSY if the new chip overlaps with some other chip's integer | |
1111 | * space. | |
1112 | */ | |
1113 | static int gpiochip_add_to_list(struct gpio_chip *chip) | |
1114 | { | |
1115 | struct list_head *pos = &gpio_chips; | |
1116 | struct gpio_chip *_chip; | |
1117 | int err = 0; | |
1118 | ||
1119 | /* find where to insert our chip */ | |
1120 | list_for_each(pos, &gpio_chips) { | |
1121 | _chip = list_entry(pos, struct gpio_chip, list); | |
1122 | /* shall we insert before _chip? */ | |
1123 | if (_chip->base >= chip->base + chip->ngpio) | |
1124 | break; | |
1125 | } | |
1126 | ||
1127 | /* are we stepping on the chip right before? */ | |
1128 | if (pos != &gpio_chips && pos->prev != &gpio_chips) { | |
1129 | _chip = list_entry(pos->prev, struct gpio_chip, list); | |
1130 | if (_chip->base + _chip->ngpio > chip->base) { | |
1131 | dev_err(chip->dev, | |
1132 | "GPIO integer space overlap, cannot add chip\n"); | |
1133 | err = -EBUSY; | |
1134 | } | |
1135 | } | |
1136 | ||
1137 | if (!err) | |
1138 | list_add_tail(&chip->list, pos); | |
1139 | ||
1140 | return err; | |
1141 | } | |
1142 | ||
d2876d08 DB |
1143 | /** |
1144 | * gpiochip_add() - register a gpio_chip | |
1145 | * @chip: the chip to register, with chip->base initialized | |
1146 | * Context: potentially before irqs or kmalloc will work | |
1147 | * | |
1148 | * Returns a negative errno if the chip can't be registered, such as | |
1149 | * because the chip->base is invalid or already associated with a | |
1150 | * different chip. Otherwise it returns zero as a success code. | |
8d0aab2f | 1151 | * |
d8f388d8 DB |
1152 | * When gpiochip_add() is called very early during boot, so that GPIOs |
1153 | * can be freely used, the chip->dev device must be registered before | |
1154 | * the gpio framework's arch_initcall(). Otherwise sysfs initialization | |
1155 | * for GPIOs will fail rudely. | |
1156 | * | |
8d0aab2f AV |
1157 | * If chip->base is negative, this requests dynamic assignment of |
1158 | * a range of valid GPIOs. | |
d2876d08 DB |
1159 | */ |
1160 | int gpiochip_add(struct gpio_chip *chip) | |
1161 | { | |
1162 | unsigned long flags; | |
1163 | int status = 0; | |
1164 | unsigned id; | |
8d0aab2f | 1165 | int base = chip->base; |
d2876d08 | 1166 | |
bff5fda9 | 1167 | if ((!gpio_is_valid(base) || !gpio_is_valid(base + chip->ngpio - 1)) |
8d0aab2f | 1168 | && base >= 0) { |
d2876d08 DB |
1169 | status = -EINVAL; |
1170 | goto fail; | |
1171 | } | |
1172 | ||
1173 | spin_lock_irqsave(&gpio_lock, flags); | |
1174 | ||
8d0aab2f AV |
1175 | if (base < 0) { |
1176 | base = gpiochip_find_base(chip->ngpio); | |
1177 | if (base < 0) { | |
1178 | status = base; | |
d8f388d8 | 1179 | goto unlock; |
8d0aab2f AV |
1180 | } |
1181 | chip->base = base; | |
1182 | } | |
1183 | ||
1a989d0f AC |
1184 | status = gpiochip_add_to_list(chip); |
1185 | ||
d2876d08 | 1186 | if (status == 0) { |
6c0b4e6c AC |
1187 | chip->desc = &gpio_desc[chip->base]; |
1188 | ||
1189 | for (id = 0; id < chip->ngpio; id++) { | |
1190 | struct gpio_desc *desc = &chip->desc[id]; | |
1191 | desc->chip = chip; | |
d8f388d8 DB |
1192 | |
1193 | /* REVISIT: most hardware initializes GPIOs as | |
1194 | * inputs (often with pullups enabled) so power | |
1195 | * usage is minimized. Linux code should set the | |
1196 | * gpio direction first thing; but until it does, | |
80b0a602 | 1197 | * and in case chip->get_direction is not set, |
d8f388d8 DB |
1198 | * we may expose the wrong direction in sysfs. |
1199 | */ | |
6c0b4e6c | 1200 | desc->flags = !chip->direction_input |
d8f388d8 DB |
1201 | ? (1 << FLAG_IS_OUT) |
1202 | : 0; | |
d2876d08 DB |
1203 | } |
1204 | } | |
1205 | ||
3bae4811 ZG |
1206 | spin_unlock_irqrestore(&gpio_lock, flags); |
1207 | ||
f23f1516 SH |
1208 | #ifdef CONFIG_PINCTRL |
1209 | INIT_LIST_HEAD(&chip->pin_ranges); | |
1210 | #endif | |
1211 | ||
391c970c AV |
1212 | of_gpiochip_add(chip); |
1213 | ||
cedb1881 AV |
1214 | if (status) |
1215 | goto fail; | |
1216 | ||
1217 | status = gpiochip_export(chip); | |
1218 | if (status) | |
1219 | goto fail; | |
1220 | ||
ee1c1e7d | 1221 | pr_debug("gpiochip_add: registered GPIOs %d to %d on device: %s\n", |
64842aad GL |
1222 | chip->base, chip->base + chip->ngpio - 1, |
1223 | chip->label ? : "generic"); | |
1224 | ||
cedb1881 | 1225 | return 0; |
3bae4811 ZG |
1226 | |
1227 | unlock: | |
1228 | spin_unlock_irqrestore(&gpio_lock, flags); | |
d2876d08 DB |
1229 | fail: |
1230 | /* failures here can mean systems won't boot... */ | |
cedb1881 AV |
1231 | pr_err("gpiochip_add: gpios %d..%d (%s) failed to register\n", |
1232 | chip->base, chip->base + chip->ngpio - 1, | |
1233 | chip->label ? : "generic"); | |
d2876d08 DB |
1234 | return status; |
1235 | } | |
1236 | EXPORT_SYMBOL_GPL(gpiochip_add); | |
1237 | ||
1238 | /** | |
1239 | * gpiochip_remove() - unregister a gpio_chip | |
1240 | * @chip: the chip to unregister | |
1241 | * | |
1242 | * A gpio_chip with any GPIOs still requested may not be removed. | |
1243 | */ | |
1244 | int gpiochip_remove(struct gpio_chip *chip) | |
1245 | { | |
1246 | unsigned long flags; | |
1247 | int status = 0; | |
1248 | unsigned id; | |
1249 | ||
1250 | spin_lock_irqsave(&gpio_lock, flags); | |
1251 | ||
9ef0d6f7 | 1252 | gpiochip_remove_pin_ranges(chip); |
391c970c AV |
1253 | of_gpiochip_remove(chip); |
1254 | ||
6c0b4e6c AC |
1255 | for (id = 0; id < chip->ngpio; id++) { |
1256 | if (test_bit(FLAG_REQUESTED, &chip->desc[id].flags)) { | |
d2876d08 DB |
1257 | status = -EBUSY; |
1258 | break; | |
1259 | } | |
1260 | } | |
1261 | if (status == 0) { | |
6c0b4e6c AC |
1262 | for (id = 0; id < chip->ngpio; id++) |
1263 | chip->desc[id].chip = NULL; | |
1a989d0f AC |
1264 | |
1265 | list_del(&chip->list); | |
d2876d08 DB |
1266 | } |
1267 | ||
1268 | spin_unlock_irqrestore(&gpio_lock, flags); | |
d8f388d8 DB |
1269 | |
1270 | if (status == 0) | |
1271 | gpiochip_unexport(chip); | |
1272 | ||
d2876d08 DB |
1273 | return status; |
1274 | } | |
1275 | EXPORT_SYMBOL_GPL(gpiochip_remove); | |
1276 | ||
594fa265 GL |
1277 | /** |
1278 | * gpiochip_find() - iterator for locating a specific gpio_chip | |
1279 | * @data: data to pass to match function | |
1280 | * @callback: Callback function to check gpio_chip | |
1281 | * | |
1282 | * Similar to bus_find_device. It returns a reference to a gpio_chip as | |
1283 | * determined by a user supplied @match callback. The callback should return | |
1284 | * 0 if the device doesn't match and non-zero if it does. If the callback is | |
1285 | * non-zero, this function will return to the caller and not iterate over any | |
1286 | * more gpio_chips. | |
1287 | */ | |
07ce8ec7 | 1288 | struct gpio_chip *gpiochip_find(void *data, |
6e2cf651 | 1289 | int (*match)(struct gpio_chip *chip, |
3d0f7cf0 | 1290 | void *data)) |
594fa265 | 1291 | { |
125eef96 | 1292 | struct gpio_chip *chip; |
594fa265 | 1293 | unsigned long flags; |
594fa265 GL |
1294 | |
1295 | spin_lock_irqsave(&gpio_lock, flags); | |
125eef96 AC |
1296 | list_for_each_entry(chip, &gpio_chips, list) |
1297 | if (match(chip, data)) | |
594fa265 | 1298 | break; |
125eef96 AC |
1299 | |
1300 | /* No match? */ | |
1301 | if (&chip->list == &gpio_chips) | |
1302 | chip = NULL; | |
594fa265 GL |
1303 | spin_unlock_irqrestore(&gpio_lock, flags); |
1304 | ||
1305 | return chip; | |
1306 | } | |
8fa0c9bf | 1307 | EXPORT_SYMBOL_GPL(gpiochip_find); |
d2876d08 | 1308 | |
f23f1516 | 1309 | #ifdef CONFIG_PINCTRL |
165adc9c | 1310 | |
3f0f8670 LW |
1311 | /** |
1312 | * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping | |
1313 | * @chip: the gpiochip to add the range for | |
1314 | * @pinctrl_name: the dev_name() of the pin controller to map to | |
316511c0 LW |
1315 | * @gpio_offset: the start offset in the current gpio_chip number space |
1316 | * @pin_offset: the start offset in the pin controller number space | |
3f0f8670 LW |
1317 | * @npins: the number of pins from the offset of each pin space (GPIO and |
1318 | * pin controller) to accumulate in this range | |
1319 | */ | |
1e63d7b9 | 1320 | int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, |
316511c0 | 1321 | unsigned int gpio_offset, unsigned int pin_offset, |
3f0f8670 | 1322 | unsigned int npins) |
f23f1516 SH |
1323 | { |
1324 | struct gpio_pin_range *pin_range; | |
b4d4b1f0 | 1325 | int ret; |
f23f1516 | 1326 | |
3f0f8670 | 1327 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); |
f23f1516 SH |
1328 | if (!pin_range) { |
1329 | pr_err("%s: GPIO chip: failed to allocate pin ranges\n", | |
1330 | chip->label); | |
1e63d7b9 | 1331 | return -ENOMEM; |
f23f1516 SH |
1332 | } |
1333 | ||
3f0f8670 | 1334 | /* Use local offset as range ID */ |
316511c0 | 1335 | pin_range->range.id = gpio_offset; |
3f0f8670 | 1336 | pin_range->range.gc = chip; |
f23f1516 | 1337 | pin_range->range.name = chip->label; |
316511c0 LW |
1338 | pin_range->range.base = chip->base + gpio_offset; |
1339 | pin_range->range.pin_base = pin_offset; | |
f23f1516 | 1340 | pin_range->range.npins = npins; |
192c369c | 1341 | pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name, |
f23f1516 | 1342 | &pin_range->range); |
8f23ca1a | 1343 | if (IS_ERR(pin_range->pctldev)) { |
b4d4b1f0 | 1344 | ret = PTR_ERR(pin_range->pctldev); |
3f0f8670 LW |
1345 | pr_err("%s: GPIO chip: could not create pin range\n", |
1346 | chip->label); | |
1347 | kfree(pin_range); | |
b4d4b1f0 | 1348 | return ret; |
3f0f8670 | 1349 | } |
316511c0 LW |
1350 | pr_debug("GPIO chip %s: created GPIO range %d->%d ==> %s PIN %d->%d\n", |
1351 | chip->label, gpio_offset, gpio_offset + npins - 1, | |
1352 | pinctl_name, | |
1353 | pin_offset, pin_offset + npins - 1); | |
f23f1516 SH |
1354 | |
1355 | list_add_tail(&pin_range->node, &chip->pin_ranges); | |
1e63d7b9 LW |
1356 | |
1357 | return 0; | |
f23f1516 | 1358 | } |
165adc9c | 1359 | EXPORT_SYMBOL_GPL(gpiochip_add_pin_range); |
f23f1516 | 1360 | |
3f0f8670 LW |
1361 | /** |
1362 | * gpiochip_remove_pin_ranges() - remove all the GPIO <-> pin mappings | |
1363 | * @chip: the chip to remove all the mappings for | |
1364 | */ | |
f23f1516 SH |
1365 | void gpiochip_remove_pin_ranges(struct gpio_chip *chip) |
1366 | { | |
1367 | struct gpio_pin_range *pin_range, *tmp; | |
1368 | ||
1369 | list_for_each_entry_safe(pin_range, tmp, &chip->pin_ranges, node) { | |
1370 | list_del(&pin_range->node); | |
1371 | pinctrl_remove_gpio_range(pin_range->pctldev, | |
1372 | &pin_range->range); | |
3f0f8670 | 1373 | kfree(pin_range); |
f23f1516 SH |
1374 | } |
1375 | } | |
165adc9c LW |
1376 | EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges); |
1377 | ||
1378 | #endif /* CONFIG_PINCTRL */ | |
f23f1516 | 1379 | |
d2876d08 DB |
1380 | /* These "optional" allocation calls help prevent drivers from stomping |
1381 | * on each other, and help provide better diagnostics in debugfs. | |
1382 | * They're called even less than the "set direction" calls. | |
1383 | */ | |
372e722e | 1384 | static int gpiod_request(struct gpio_desc *desc, const char *label) |
d2876d08 | 1385 | { |
35e8bb51 | 1386 | struct gpio_chip *chip; |
e9354576 | 1387 | int status = -EPROBE_DEFER; |
d2876d08 DB |
1388 | unsigned long flags; |
1389 | ||
0204df47 | 1390 | if (!desc) { |
bcabdef1 AC |
1391 | pr_warn("%s: invalid GPIO\n", __func__); |
1392 | return -EINVAL; | |
ad2fab36 | 1393 | } |
bcabdef1 AC |
1394 | |
1395 | spin_lock_irqsave(&gpio_lock, flags); | |
1396 | ||
35e8bb51 | 1397 | chip = desc->chip; |
0204df47 AC |
1398 | if (chip == NULL) |
1399 | goto done; | |
d2876d08 | 1400 | |
35e8bb51 | 1401 | if (!try_module_get(chip->owner)) |
438d8908 GL |
1402 | goto done; |
1403 | ||
d2876d08 | 1404 | /* NOTE: gpio_request() can be called in early boot, |
35e8bb51 | 1405 | * before IRQs are enabled, for non-sleeping (SOC) GPIOs. |
d2876d08 DB |
1406 | */ |
1407 | ||
1408 | if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) { | |
1409 | desc_set_label(desc, label ? : "?"); | |
1410 | status = 0; | |
438d8908 | 1411 | } else { |
d2876d08 | 1412 | status = -EBUSY; |
35e8bb51 | 1413 | module_put(chip->owner); |
7460db56 | 1414 | goto done; |
35e8bb51 DB |
1415 | } |
1416 | ||
1417 | if (chip->request) { | |
1418 | /* chip->request may sleep */ | |
1419 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 1420 | status = chip->request(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
1421 | spin_lock_irqsave(&gpio_lock, flags); |
1422 | ||
1423 | if (status < 0) { | |
1424 | desc_set_label(desc, NULL); | |
1425 | module_put(chip->owner); | |
1426 | clear_bit(FLAG_REQUESTED, &desc->flags); | |
80b0a602 | 1427 | goto done; |
35e8bb51 | 1428 | } |
438d8908 | 1429 | } |
80b0a602 MN |
1430 | if (chip->get_direction) { |
1431 | /* chip->get_direction may sleep */ | |
1432 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 1433 | gpiod_get_direction(desc); |
80b0a602 MN |
1434 | spin_lock_irqsave(&gpio_lock, flags); |
1435 | } | |
d2876d08 DB |
1436 | done: |
1437 | if (status) | |
372e722e | 1438 | pr_debug("_gpio_request: gpio-%d (%s) status %d\n", |
bcabdef1 | 1439 | desc_to_gpio(desc), label ? : "?", status); |
d2876d08 DB |
1440 | spin_unlock_irqrestore(&gpio_lock, flags); |
1441 | return status; | |
1442 | } | |
372e722e AC |
1443 | |
1444 | int gpio_request(unsigned gpio, const char *label) | |
1445 | { | |
1446 | return gpiod_request(gpio_to_desc(gpio), label); | |
1447 | } | |
d2876d08 DB |
1448 | EXPORT_SYMBOL_GPL(gpio_request); |
1449 | ||
372e722e | 1450 | static void gpiod_free(struct gpio_desc *desc) |
d2876d08 DB |
1451 | { |
1452 | unsigned long flags; | |
35e8bb51 | 1453 | struct gpio_chip *chip; |
d2876d08 | 1454 | |
3d599d1c UKK |
1455 | might_sleep(); |
1456 | ||
372e722e | 1457 | if (!desc) { |
d2876d08 DB |
1458 | WARN_ON(extra_checks); |
1459 | return; | |
1460 | } | |
1461 | ||
372e722e | 1462 | gpiod_unexport(desc); |
d8f388d8 | 1463 | |
d2876d08 DB |
1464 | spin_lock_irqsave(&gpio_lock, flags); |
1465 | ||
35e8bb51 DB |
1466 | chip = desc->chip; |
1467 | if (chip && test_bit(FLAG_REQUESTED, &desc->flags)) { | |
1468 | if (chip->free) { | |
1469 | spin_unlock_irqrestore(&gpio_lock, flags); | |
9c4ba946 | 1470 | might_sleep_if(chip->can_sleep); |
372e722e | 1471 | chip->free(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
1472 | spin_lock_irqsave(&gpio_lock, flags); |
1473 | } | |
d2876d08 | 1474 | desc_set_label(desc, NULL); |
438d8908 | 1475 | module_put(desc->chip->owner); |
07697461 | 1476 | clear_bit(FLAG_ACTIVE_LOW, &desc->flags); |
35e8bb51 | 1477 | clear_bit(FLAG_REQUESTED, &desc->flags); |
aca5ce14 | 1478 | clear_bit(FLAG_OPEN_DRAIN, &desc->flags); |
25553ff0 | 1479 | clear_bit(FLAG_OPEN_SOURCE, &desc->flags); |
438d8908 | 1480 | } else |
d2876d08 DB |
1481 | WARN_ON(extra_checks); |
1482 | ||
1483 | spin_unlock_irqrestore(&gpio_lock, flags); | |
1484 | } | |
372e722e AC |
1485 | |
1486 | void gpio_free(unsigned gpio) | |
1487 | { | |
1488 | gpiod_free(gpio_to_desc(gpio)); | |
1489 | } | |
d2876d08 DB |
1490 | EXPORT_SYMBOL_GPL(gpio_free); |
1491 | ||
3e45f1d1 EM |
1492 | /** |
1493 | * gpio_request_one - request a single GPIO with initial configuration | |
1494 | * @gpio: the GPIO number | |
1495 | * @flags: GPIO configuration as specified by GPIOF_* | |
1496 | * @label: a literal description string of this GPIO | |
1497 | */ | |
1498 | int gpio_request_one(unsigned gpio, unsigned long flags, const char *label) | |
1499 | { | |
372e722e | 1500 | struct gpio_desc *desc; |
3e45f1d1 EM |
1501 | int err; |
1502 | ||
372e722e AC |
1503 | desc = gpio_to_desc(gpio); |
1504 | ||
1505 | err = gpiod_request(desc, label); | |
3e45f1d1 EM |
1506 | if (err) |
1507 | return err; | |
1508 | ||
aca5ce14 | 1509 | if (flags & GPIOF_OPEN_DRAIN) |
372e722e | 1510 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); |
aca5ce14 | 1511 | |
25553ff0 | 1512 | if (flags & GPIOF_OPEN_SOURCE) |
372e722e | 1513 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); |
25553ff0 | 1514 | |
3e45f1d1 | 1515 | if (flags & GPIOF_DIR_IN) |
372e722e | 1516 | err = gpiod_direction_input(desc); |
3e45f1d1 | 1517 | else |
372e722e | 1518 | err = gpiod_direction_output(desc, |
3e45f1d1 EM |
1519 | (flags & GPIOF_INIT_HIGH) ? 1 : 0); |
1520 | ||
e254811c | 1521 | if (err) |
fc3a1f04 WS |
1522 | goto free_gpio; |
1523 | ||
1524 | if (flags & GPIOF_EXPORT) { | |
372e722e | 1525 | err = gpiod_export(desc, flags & GPIOF_EXPORT_CHANGEABLE); |
fc3a1f04 WS |
1526 | if (err) |
1527 | goto free_gpio; | |
1528 | } | |
1529 | ||
1530 | return 0; | |
e254811c | 1531 | |
fc3a1f04 | 1532 | free_gpio: |
372e722e | 1533 | gpiod_free(desc); |
3e45f1d1 EM |
1534 | return err; |
1535 | } | |
1536 | EXPORT_SYMBOL_GPL(gpio_request_one); | |
1537 | ||
1538 | /** | |
1539 | * gpio_request_array - request multiple GPIOs in a single call | |
1540 | * @array: array of the 'struct gpio' | |
1541 | * @num: how many GPIOs in the array | |
1542 | */ | |
7c295975 | 1543 | int gpio_request_array(const struct gpio *array, size_t num) |
3e45f1d1 EM |
1544 | { |
1545 | int i, err; | |
1546 | ||
1547 | for (i = 0; i < num; i++, array++) { | |
1548 | err = gpio_request_one(array->gpio, array->flags, array->label); | |
1549 | if (err) | |
1550 | goto err_free; | |
1551 | } | |
1552 | return 0; | |
1553 | ||
1554 | err_free: | |
1555 | while (i--) | |
1556 | gpio_free((--array)->gpio); | |
1557 | return err; | |
1558 | } | |
1559 | EXPORT_SYMBOL_GPL(gpio_request_array); | |
1560 | ||
1561 | /** | |
1562 | * gpio_free_array - release multiple GPIOs in a single call | |
1563 | * @array: array of the 'struct gpio' | |
1564 | * @num: how many GPIOs in the array | |
1565 | */ | |
7c295975 | 1566 | void gpio_free_array(const struct gpio *array, size_t num) |
3e45f1d1 EM |
1567 | { |
1568 | while (num--) | |
1569 | gpio_free((array++)->gpio); | |
1570 | } | |
1571 | EXPORT_SYMBOL_GPL(gpio_free_array); | |
d2876d08 DB |
1572 | |
1573 | /** | |
1574 | * gpiochip_is_requested - return string iff signal was requested | |
1575 | * @chip: controller managing the signal | |
1576 | * @offset: of signal within controller's 0..(ngpio - 1) range | |
1577 | * | |
1578 | * Returns NULL if the GPIO is not currently requested, else a string. | |
1579 | * If debugfs support is enabled, the string returned is the label passed | |
1580 | * to gpio_request(); otherwise it is a meaningless constant. | |
1581 | * | |
1582 | * This function is for use by GPIO controller drivers. The label can | |
1583 | * help with diagnostics, and knowing that the signal is used as a GPIO | |
1584 | * can help avoid accidentally multiplexing it to another controller. | |
1585 | */ | |
1586 | const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset) | |
1587 | { | |
6c0b4e6c | 1588 | struct gpio_desc *desc; |
d2876d08 | 1589 | |
6c0b4e6c | 1590 | if (!GPIO_OFFSET_VALID(chip, offset)) |
d2876d08 | 1591 | return NULL; |
6c0b4e6c AC |
1592 | |
1593 | desc = &chip->desc[offset]; | |
1594 | ||
372e722e | 1595 | if (test_bit(FLAG_REQUESTED, &desc->flags) == 0) |
d2876d08 DB |
1596 | return NULL; |
1597 | #ifdef CONFIG_DEBUG_FS | |
372e722e | 1598 | return desc->label; |
d2876d08 DB |
1599 | #else |
1600 | return "?"; | |
1601 | #endif | |
1602 | } | |
1603 | EXPORT_SYMBOL_GPL(gpiochip_is_requested); | |
1604 | ||
1605 | ||
1606 | /* Drivers MUST set GPIO direction before making get/set calls. In | |
1607 | * some cases this is done in early boot, before IRQs are enabled. | |
1608 | * | |
1609 | * As a rule these aren't called more than once (except for drivers | |
1610 | * using the open-drain emulation idiom) so these are natural places | |
1611 | * to accumulate extra debugging checks. Note that we can't (yet) | |
1612 | * rely on gpio_request() having been called beforehand. | |
1613 | */ | |
1614 | ||
79a9becd AC |
1615 | /** |
1616 | * gpiod_direction_input - set the GPIO direction to input | |
1617 | * @desc: GPIO to set to input | |
1618 | * | |
1619 | * Set the direction of the passed GPIO to input, such as gpiod_get_value() can | |
1620 | * be called safely on it. | |
1621 | * | |
1622 | * Return 0 in case of success, else an error code. | |
1623 | */ | |
1624 | int gpiod_direction_input(struct gpio_desc *desc) | |
d2876d08 DB |
1625 | { |
1626 | unsigned long flags; | |
1627 | struct gpio_chip *chip; | |
d2876d08 | 1628 | int status = -EINVAL; |
372e722e | 1629 | int offset; |
d2876d08 | 1630 | |
be1a4b13 | 1631 | if (!desc || !desc->chip) { |
bcabdef1 AC |
1632 | pr_warn("%s: invalid GPIO\n", __func__); |
1633 | return -EINVAL; | |
1634 | } | |
1635 | ||
be1a4b13 LW |
1636 | chip = desc->chip; |
1637 | if (!chip->get || !chip->direction_input) { | |
6424de5a MB |
1638 | gpiod_warn(desc, |
1639 | "%s: missing get() or direction_input() operations\n", | |
1640 | __func__); | |
be1a4b13 LW |
1641 | return -EIO; |
1642 | } | |
1643 | ||
d2876d08 DB |
1644 | spin_lock_irqsave(&gpio_lock, flags); |
1645 | ||
372e722e | 1646 | status = gpio_ensure_requested(desc); |
35e8bb51 DB |
1647 | if (status < 0) |
1648 | goto fail; | |
d2876d08 DB |
1649 | |
1650 | /* now we know the gpio is valid and chip won't vanish */ | |
1651 | ||
1652 | spin_unlock_irqrestore(&gpio_lock, flags); | |
1653 | ||
9c4ba946 | 1654 | might_sleep_if(chip->can_sleep); |
d2876d08 | 1655 | |
372e722e | 1656 | offset = gpio_chip_hwgpio(desc); |
35e8bb51 | 1657 | if (status) { |
372e722e | 1658 | status = chip->request(chip, offset); |
35e8bb51 | 1659 | if (status < 0) { |
6424de5a | 1660 | gpiod_dbg(desc, "chip request fail, %d\n", status); |
35e8bb51 DB |
1661 | /* and it's not available to anyone else ... |
1662 | * gpio_request() is the fully clean solution. | |
1663 | */ | |
1664 | goto lose; | |
1665 | } | |
1666 | } | |
1667 | ||
372e722e | 1668 | status = chip->direction_input(chip, offset); |
d2876d08 DB |
1669 | if (status == 0) |
1670 | clear_bit(FLAG_IS_OUT, &desc->flags); | |
3f397c21 | 1671 | |
372e722e | 1672 | trace_gpio_direction(desc_to_gpio(desc), 1, status); |
35e8bb51 | 1673 | lose: |
d2876d08 DB |
1674 | return status; |
1675 | fail: | |
1676 | spin_unlock_irqrestore(&gpio_lock, flags); | |
bcabdef1 | 1677 | if (status) |
6424de5a | 1678 | gpiod_dbg(desc, "%s status %d\n", __func__, status); |
d2876d08 DB |
1679 | return status; |
1680 | } | |
79a9becd | 1681 | EXPORT_SYMBOL_GPL(gpiod_direction_input); |
372e722e | 1682 | |
79a9becd AC |
1683 | /** |
1684 | * gpiod_direction_output - set the GPIO direction to input | |
1685 | * @desc: GPIO to set to output | |
1686 | * @value: initial output value of the GPIO | |
1687 | * | |
1688 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
1689 | * be called safely on it. The initial value of the output must be specified. | |
1690 | * | |
1691 | * Return 0 in case of success, else an error code. | |
1692 | */ | |
1693 | int gpiod_direction_output(struct gpio_desc *desc, int value) | |
d2876d08 DB |
1694 | { |
1695 | unsigned long flags; | |
1696 | struct gpio_chip *chip; | |
d2876d08 | 1697 | int status = -EINVAL; |
372e722e | 1698 | int offset; |
d2876d08 | 1699 | |
be1a4b13 | 1700 | if (!desc || !desc->chip) { |
bcabdef1 AC |
1701 | pr_warn("%s: invalid GPIO\n", __func__); |
1702 | return -EINVAL; | |
1703 | } | |
1704 | ||
d468bf9e LW |
1705 | /* GPIOs used for IRQs shall not be set as output */ |
1706 | if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) { | |
1707 | gpiod_err(desc, | |
1708 | "%s: tried to set a GPIO tied to an IRQ as output\n", | |
1709 | __func__); | |
1710 | return -EIO; | |
1711 | } | |
1712 | ||
aca5ce14 LD |
1713 | /* Open drain pin should not be driven to 1 */ |
1714 | if (value && test_bit(FLAG_OPEN_DRAIN, &desc->flags)) | |
372e722e | 1715 | return gpiod_direction_input(desc); |
aca5ce14 | 1716 | |
25553ff0 LD |
1717 | /* Open source pin should not be driven to 0 */ |
1718 | if (!value && test_bit(FLAG_OPEN_SOURCE, &desc->flags)) | |
372e722e | 1719 | return gpiod_direction_input(desc); |
25553ff0 | 1720 | |
be1a4b13 LW |
1721 | chip = desc->chip; |
1722 | if (!chip->set || !chip->direction_output) { | |
6424de5a MB |
1723 | gpiod_warn(desc, |
1724 | "%s: missing set() or direction_output() operations\n", | |
1725 | __func__); | |
be1a4b13 LW |
1726 | return -EIO; |
1727 | } | |
1728 | ||
d2876d08 DB |
1729 | spin_lock_irqsave(&gpio_lock, flags); |
1730 | ||
372e722e | 1731 | status = gpio_ensure_requested(desc); |
35e8bb51 DB |
1732 | if (status < 0) |
1733 | goto fail; | |
d2876d08 DB |
1734 | |
1735 | /* now we know the gpio is valid and chip won't vanish */ | |
1736 | ||
1737 | spin_unlock_irqrestore(&gpio_lock, flags); | |
1738 | ||
9c4ba946 | 1739 | might_sleep_if(chip->can_sleep); |
d2876d08 | 1740 | |
372e722e | 1741 | offset = gpio_chip_hwgpio(desc); |
35e8bb51 | 1742 | if (status) { |
372e722e | 1743 | status = chip->request(chip, offset); |
35e8bb51 | 1744 | if (status < 0) { |
6424de5a | 1745 | gpiod_dbg(desc, "chip request fail, %d\n", status); |
35e8bb51 DB |
1746 | /* and it's not available to anyone else ... |
1747 | * gpio_request() is the fully clean solution. | |
1748 | */ | |
1749 | goto lose; | |
1750 | } | |
1751 | } | |
1752 | ||
372e722e | 1753 | status = chip->direction_output(chip, offset, value); |
d2876d08 DB |
1754 | if (status == 0) |
1755 | set_bit(FLAG_IS_OUT, &desc->flags); | |
372e722e AC |
1756 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
1757 | trace_gpio_direction(desc_to_gpio(desc), 0, status); | |
35e8bb51 | 1758 | lose: |
d2876d08 DB |
1759 | return status; |
1760 | fail: | |
1761 | spin_unlock_irqrestore(&gpio_lock, flags); | |
bcabdef1 | 1762 | if (status) |
6424de5a | 1763 | gpiod_dbg(desc, "%s: gpio status %d\n", __func__, status); |
d2876d08 DB |
1764 | return status; |
1765 | } | |
79a9becd | 1766 | EXPORT_SYMBOL_GPL(gpiod_direction_output); |
d2876d08 | 1767 | |
c4b5be98 | 1768 | /** |
79a9becd | 1769 | * gpiod_set_debounce - sets @debounce time for a @gpio |
c4b5be98 FB |
1770 | * @gpio: the gpio to set debounce time |
1771 | * @debounce: debounce time is microseconds | |
65d87656 LW |
1772 | * |
1773 | * returns -ENOTSUPP if the controller does not support setting | |
1774 | * debounce. | |
c4b5be98 | 1775 | */ |
79a9becd | 1776 | int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce) |
c4b5be98 FB |
1777 | { |
1778 | unsigned long flags; | |
1779 | struct gpio_chip *chip; | |
c4b5be98 | 1780 | int status = -EINVAL; |
372e722e | 1781 | int offset; |
c4b5be98 | 1782 | |
be1a4b13 | 1783 | if (!desc || !desc->chip) { |
bcabdef1 AC |
1784 | pr_warn("%s: invalid GPIO\n", __func__); |
1785 | return -EINVAL; | |
1786 | } | |
1787 | ||
c4b5be98 | 1788 | chip = desc->chip; |
be1a4b13 | 1789 | if (!chip->set || !chip->set_debounce) { |
6424de5a MB |
1790 | gpiod_dbg(desc, |
1791 | "%s: missing set() or set_debounce() operations\n", | |
1792 | __func__); | |
65d87656 | 1793 | return -ENOTSUPP; |
be1a4b13 LW |
1794 | } |
1795 | ||
1796 | spin_lock_irqsave(&gpio_lock, flags); | |
372e722e AC |
1797 | |
1798 | status = gpio_ensure_requested(desc); | |
c4b5be98 FB |
1799 | if (status < 0) |
1800 | goto fail; | |
1801 | ||
1802 | /* now we know the gpio is valid and chip won't vanish */ | |
1803 | ||
1804 | spin_unlock_irqrestore(&gpio_lock, flags); | |
1805 | ||
9c4ba946 | 1806 | might_sleep_if(chip->can_sleep); |
c4b5be98 | 1807 | |
372e722e AC |
1808 | offset = gpio_chip_hwgpio(desc); |
1809 | return chip->set_debounce(chip, offset, debounce); | |
c4b5be98 FB |
1810 | |
1811 | fail: | |
1812 | spin_unlock_irqrestore(&gpio_lock, flags); | |
bcabdef1 | 1813 | if (status) |
6424de5a | 1814 | gpiod_dbg(desc, "%s: status %d\n", __func__, status); |
c4b5be98 FB |
1815 | |
1816 | return status; | |
1817 | } | |
79a9becd | 1818 | EXPORT_SYMBOL_GPL(gpiod_set_debounce); |
372e722e | 1819 | |
79a9becd AC |
1820 | /** |
1821 | * gpiod_is_active_low - test whether a GPIO is active-low or not | |
1822 | * @desc: the gpio descriptor to test | |
1823 | * | |
1824 | * Returns 1 if the GPIO is active-low, 0 otherwise. | |
1825 | */ | |
1826 | int gpiod_is_active_low(const struct gpio_desc *desc) | |
372e722e | 1827 | { |
79a9becd | 1828 | return test_bit(FLAG_ACTIVE_LOW, &desc->flags); |
372e722e | 1829 | } |
79a9becd | 1830 | EXPORT_SYMBOL_GPL(gpiod_is_active_low); |
d2876d08 DB |
1831 | |
1832 | /* I/O calls are only valid after configuration completed; the relevant | |
1833 | * "is this a valid GPIO" error checks should already have been done. | |
1834 | * | |
1835 | * "Get" operations are often inlinable as reading a pin value register, | |
1836 | * and masking the relevant bit in that register. | |
1837 | * | |
1838 | * When "set" operations are inlinable, they involve writing that mask to | |
1839 | * one register to set a low value, or a different register to set it high. | |
1840 | * Otherwise locking is needed, so there may be little value to inlining. | |
1841 | * | |
1842 | *------------------------------------------------------------------------ | |
1843 | * | |
1844 | * IMPORTANT!!! The hot paths -- get/set value -- assume that callers | |
1845 | * have requested the GPIO. That can include implicit requesting by | |
1846 | * a direction setting call. Marking a gpio as requested locks its chip | |
1847 | * in memory, guaranteeing that these table lookups need no more locking | |
1848 | * and that gpiochip_remove() will fail. | |
1849 | * | |
1850 | * REVISIT when debugging, consider adding some instrumentation to ensure | |
1851 | * that the GPIO was actually requested. | |
1852 | */ | |
1853 | ||
79a9becd | 1854 | static int _gpiod_get_raw_value(const struct gpio_desc *desc) |
d8e0ac08 AC |
1855 | { |
1856 | struct gpio_chip *chip; | |
1857 | int value; | |
1858 | int offset; | |
1859 | ||
1860 | chip = desc->chip; | |
1861 | offset = gpio_chip_hwgpio(desc); | |
1862 | value = chip->get ? chip->get(chip, offset) : 0; | |
1863 | trace_gpio_value(desc_to_gpio(desc), 1, value); | |
1864 | return value; | |
1865 | } | |
1866 | ||
d2876d08 | 1867 | /** |
79a9becd AC |
1868 | * gpiod_get_raw_value() - return a gpio's raw value |
1869 | * @desc: gpio whose value will be returned | |
d2876d08 | 1870 | * |
79a9becd AC |
1871 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding |
1872 | * its ACTIVE_LOW status. | |
1873 | * | |
1874 | * This function should be called from contexts where we cannot sleep, and will | |
1875 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 1876 | */ |
79a9becd | 1877 | int gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 | 1878 | { |
bcabdef1 AC |
1879 | if (!desc) |
1880 | return 0; | |
e4e449e8 | 1881 | /* Should be using gpio_get_value_cansleep() */ |
d8e0ac08 | 1882 | WARN_ON(desc->chip->can_sleep); |
79a9becd | 1883 | return _gpiod_get_raw_value(desc); |
d2876d08 | 1884 | } |
79a9becd | 1885 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value); |
372e722e | 1886 | |
79a9becd AC |
1887 | /** |
1888 | * gpiod_get_value() - return a gpio's value | |
1889 | * @desc: gpio whose value will be returned | |
1890 | * | |
1891 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
1892 | * account. | |
1893 | * | |
1894 | * This function should be called from contexts where we cannot sleep, and will | |
1895 | * complain if the GPIO chip functions potentially sleep. | |
1896 | */ | |
1897 | int gpiod_get_value(const struct gpio_desc *desc) | |
372e722e | 1898 | { |
79a9becd AC |
1899 | int value; |
1900 | if (!desc) | |
1901 | return 0; | |
1902 | /* Should be using gpio_get_value_cansleep() */ | |
1903 | WARN_ON(desc->chip->can_sleep); | |
1904 | ||
1905 | value = _gpiod_get_raw_value(desc); | |
1906 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
1907 | value = !value; | |
1908 | ||
1909 | return value; | |
372e722e | 1910 | } |
79a9becd | 1911 | EXPORT_SYMBOL_GPL(gpiod_get_value); |
d2876d08 | 1912 | |
aca5ce14 LD |
1913 | /* |
1914 | * _gpio_set_open_drain_value() - Set the open drain gpio's value. | |
79a9becd | 1915 | * @desc: gpio descriptor whose state need to be set. |
aca5ce14 LD |
1916 | * @value: Non-zero for setting it HIGH otherise it will set to LOW. |
1917 | */ | |
372e722e | 1918 | static void _gpio_set_open_drain_value(struct gpio_desc *desc, int value) |
aca5ce14 LD |
1919 | { |
1920 | int err = 0; | |
372e722e AC |
1921 | struct gpio_chip *chip = desc->chip; |
1922 | int offset = gpio_chip_hwgpio(desc); | |
1923 | ||
aca5ce14 | 1924 | if (value) { |
372e722e | 1925 | err = chip->direction_input(chip, offset); |
aca5ce14 | 1926 | if (!err) |
372e722e | 1927 | clear_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 1928 | } else { |
372e722e | 1929 | err = chip->direction_output(chip, offset, 0); |
aca5ce14 | 1930 | if (!err) |
372e722e | 1931 | set_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 1932 | } |
372e722e | 1933 | trace_gpio_direction(desc_to_gpio(desc), value, err); |
aca5ce14 | 1934 | if (err < 0) |
6424de5a MB |
1935 | gpiod_err(desc, |
1936 | "%s: Error in set_value for open drain err %d\n", | |
1937 | __func__, err); | |
aca5ce14 LD |
1938 | } |
1939 | ||
25553ff0 | 1940 | /* |
79a9becd AC |
1941 | * _gpio_set_open_source_value() - Set the open source gpio's value. |
1942 | * @desc: gpio descriptor whose state need to be set. | |
25553ff0 LD |
1943 | * @value: Non-zero for setting it HIGH otherise it will set to LOW. |
1944 | */ | |
372e722e | 1945 | static void _gpio_set_open_source_value(struct gpio_desc *desc, int value) |
25553ff0 LD |
1946 | { |
1947 | int err = 0; | |
372e722e AC |
1948 | struct gpio_chip *chip = desc->chip; |
1949 | int offset = gpio_chip_hwgpio(desc); | |
1950 | ||
25553ff0 | 1951 | if (value) { |
372e722e | 1952 | err = chip->direction_output(chip, offset, 1); |
25553ff0 | 1953 | if (!err) |
372e722e | 1954 | set_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 1955 | } else { |
372e722e | 1956 | err = chip->direction_input(chip, offset); |
25553ff0 | 1957 | if (!err) |
372e722e | 1958 | clear_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 1959 | } |
372e722e | 1960 | trace_gpio_direction(desc_to_gpio(desc), !value, err); |
25553ff0 | 1961 | if (err < 0) |
6424de5a MB |
1962 | gpiod_err(desc, |
1963 | "%s: Error in set_value for open source err %d\n", | |
1964 | __func__, err); | |
25553ff0 LD |
1965 | } |
1966 | ||
79a9becd | 1967 | static void _gpiod_set_raw_value(struct gpio_desc *desc, int value) |
d8e0ac08 AC |
1968 | { |
1969 | struct gpio_chip *chip; | |
1970 | ||
1971 | chip = desc->chip; | |
1972 | trace_gpio_value(desc_to_gpio(desc), 0, value); | |
1973 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) | |
1974 | _gpio_set_open_drain_value(desc, value); | |
1975 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) | |
1976 | _gpio_set_open_source_value(desc, value); | |
1977 | else | |
1978 | chip->set(chip, gpio_chip_hwgpio(desc), value); | |
1979 | } | |
1980 | ||
d2876d08 | 1981 | /** |
79a9becd AC |
1982 | * gpiod_set_raw_value() - assign a gpio's raw value |
1983 | * @desc: gpio whose value will be assigned | |
d2876d08 | 1984 | * @value: value to assign |
d2876d08 | 1985 | * |
79a9becd AC |
1986 | * Set the raw value of the GPIO, i.e. the value of its physical line without |
1987 | * regard for its ACTIVE_LOW status. | |
1988 | * | |
1989 | * This function should be called from contexts where we cannot sleep, and will | |
1990 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 1991 | */ |
79a9becd | 1992 | void gpiod_set_raw_value(struct gpio_desc *desc, int value) |
d2876d08 | 1993 | { |
bcabdef1 AC |
1994 | if (!desc) |
1995 | return; | |
e4e449e8 | 1996 | /* Should be using gpio_set_value_cansleep() */ |
d8e0ac08 | 1997 | WARN_ON(desc->chip->can_sleep); |
79a9becd | 1998 | _gpiod_set_raw_value(desc, value); |
372e722e | 1999 | } |
79a9becd | 2000 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value); |
372e722e | 2001 | |
79a9becd AC |
2002 | /** |
2003 | * gpiod_set_value() - assign a gpio's value | |
2004 | * @desc: gpio whose value will be assigned | |
2005 | * @value: value to assign | |
2006 | * | |
2007 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
2008 | * account | |
2009 | * | |
2010 | * This function should be called from contexts where we cannot sleep, and will | |
2011 | * complain if the GPIO chip functions potentially sleep. | |
2012 | */ | |
2013 | void gpiod_set_value(struct gpio_desc *desc, int value) | |
372e722e | 2014 | { |
79a9becd AC |
2015 | if (!desc) |
2016 | return; | |
2017 | /* Should be using gpio_set_value_cansleep() */ | |
2018 | WARN_ON(desc->chip->can_sleep); | |
2019 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
2020 | value = !value; | |
2021 | _gpiod_set_raw_value(desc, value); | |
d2876d08 | 2022 | } |
79a9becd | 2023 | EXPORT_SYMBOL_GPL(gpiod_set_value); |
d2876d08 DB |
2024 | |
2025 | /** | |
79a9becd AC |
2026 | * gpiod_cansleep() - report whether gpio value access may sleep |
2027 | * @desc: gpio to check | |
d2876d08 | 2028 | * |
d2876d08 | 2029 | */ |
79a9becd | 2030 | int gpiod_cansleep(const struct gpio_desc *desc) |
d2876d08 | 2031 | { |
bcabdef1 AC |
2032 | if (!desc) |
2033 | return 0; | |
372e722e AC |
2034 | return desc->chip->can_sleep; |
2035 | } | |
79a9becd | 2036 | EXPORT_SYMBOL_GPL(gpiod_cansleep); |
d2876d08 | 2037 | |
0f6d504e | 2038 | /** |
79a9becd AC |
2039 | * gpiod_to_irq() - return the IRQ corresponding to a GPIO |
2040 | * @desc: gpio whose IRQ will be returned (already requested) | |
0f6d504e | 2041 | * |
79a9becd AC |
2042 | * Return the IRQ corresponding to the passed GPIO, or an error code in case of |
2043 | * error. | |
0f6d504e | 2044 | */ |
79a9becd | 2045 | int gpiod_to_irq(const struct gpio_desc *desc) |
0f6d504e DB |
2046 | { |
2047 | struct gpio_chip *chip; | |
372e722e | 2048 | int offset; |
0f6d504e | 2049 | |
bcabdef1 AC |
2050 | if (!desc) |
2051 | return -EINVAL; | |
372e722e AC |
2052 | chip = desc->chip; |
2053 | offset = gpio_chip_hwgpio(desc); | |
2054 | return chip->to_irq ? chip->to_irq(chip, offset) : -ENXIO; | |
0f6d504e | 2055 | } |
79a9becd | 2056 | EXPORT_SYMBOL_GPL(gpiod_to_irq); |
d2876d08 | 2057 | |
d468bf9e LW |
2058 | /** |
2059 | * gpiod_lock_as_irq() - lock a GPIO to be used as IRQ | |
2060 | * @gpio: the GPIO line to lock as used for IRQ | |
2061 | * | |
2062 | * This is used directly by GPIO drivers that want to lock down | |
2063 | * a certain GPIO line to be used as IRQs, for example in the | |
2064 | * .to_irq() callback of their gpio_chip, or in the .irq_enable() | |
2065 | * of its irq_chip implementation if the GPIO is known from that | |
2066 | * code. | |
2067 | */ | |
79a9becd | 2068 | int gpiod_lock_as_irq(struct gpio_desc *desc) |
d468bf9e LW |
2069 | { |
2070 | if (!desc) | |
2071 | return -EINVAL; | |
2072 | ||
2073 | if (test_bit(FLAG_IS_OUT, &desc->flags)) { | |
2074 | gpiod_err(desc, | |
2075 | "%s: tried to flag a GPIO set as output for IRQ\n", | |
2076 | __func__); | |
2077 | return -EIO; | |
2078 | } | |
2079 | ||
2080 | set_bit(FLAG_USED_AS_IRQ, &desc->flags); | |
2081 | return 0; | |
2082 | } | |
79a9becd | 2083 | EXPORT_SYMBOL_GPL(gpiod_lock_as_irq); |
d468bf9e LW |
2084 | |
2085 | int gpio_lock_as_irq(struct gpio_chip *chip, unsigned int offset) | |
2086 | { | |
2087 | return gpiod_lock_as_irq(gpiochip_offset_to_desc(chip, offset)); | |
2088 | } | |
2089 | EXPORT_SYMBOL_GPL(gpio_lock_as_irq); | |
2090 | ||
2091 | /** | |
2092 | * gpiod_unlock_as_irq() - unlock a GPIO used as IRQ | |
2093 | * @gpio: the GPIO line to unlock from IRQ usage | |
2094 | * | |
2095 | * This is used directly by GPIO drivers that want to indicate | |
2096 | * that a certain GPIO is no longer used exclusively for IRQ. | |
2097 | */ | |
79a9becd | 2098 | void gpiod_unlock_as_irq(struct gpio_desc *desc) |
d468bf9e LW |
2099 | { |
2100 | if (!desc) | |
2101 | return; | |
2102 | ||
2103 | clear_bit(FLAG_USED_AS_IRQ, &desc->flags); | |
2104 | } | |
79a9becd | 2105 | EXPORT_SYMBOL_GPL(gpiod_unlock_as_irq); |
d468bf9e LW |
2106 | |
2107 | void gpio_unlock_as_irq(struct gpio_chip *chip, unsigned int offset) | |
2108 | { | |
2109 | return gpiod_unlock_as_irq(gpiochip_offset_to_desc(chip, offset)); | |
2110 | } | |
2111 | EXPORT_SYMBOL_GPL(gpio_unlock_as_irq); | |
d2876d08 | 2112 | |
79a9becd AC |
2113 | /** |
2114 | * gpiod_get_raw_value_cansleep() - return a gpio's raw value | |
2115 | * @desc: gpio whose value will be returned | |
2116 | * | |
2117 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding | |
2118 | * its ACTIVE_LOW status. | |
2119 | * | |
2120 | * This function is to be called from contexts that can sleep. | |
d2876d08 | 2121 | */ |
79a9becd | 2122 | int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc) |
d2876d08 | 2123 | { |
d2876d08 | 2124 | might_sleep_if(extra_checks); |
bcabdef1 AC |
2125 | if (!desc) |
2126 | return 0; | |
79a9becd | 2127 | return _gpiod_get_raw_value(desc); |
d2876d08 | 2128 | } |
79a9becd | 2129 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep); |
372e722e | 2130 | |
79a9becd AC |
2131 | /** |
2132 | * gpiod_get_value_cansleep() - return a gpio's value | |
2133 | * @desc: gpio whose value will be returned | |
2134 | * | |
2135 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
2136 | * account. | |
2137 | * | |
2138 | * This function is to be called from contexts that can sleep. | |
2139 | */ | |
2140 | int gpiod_get_value_cansleep(const struct gpio_desc *desc) | |
372e722e | 2141 | { |
79a9becd AC |
2142 | int value; |
2143 | ||
2144 | might_sleep_if(extra_checks); | |
2145 | if (!desc) | |
2146 | return 0; | |
2147 | ||
2148 | value = _gpiod_get_raw_value(desc); | |
2149 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
2150 | value = !value; | |
2151 | ||
2152 | return value; | |
372e722e | 2153 | } |
79a9becd | 2154 | EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep); |
d2876d08 | 2155 | |
79a9becd AC |
2156 | /** |
2157 | * gpiod_set_raw_value_cansleep() - assign a gpio's raw value | |
2158 | * @desc: gpio whose value will be assigned | |
2159 | * @value: value to assign | |
2160 | * | |
2161 | * Set the raw value of the GPIO, i.e. the value of its physical line without | |
2162 | * regard for its ACTIVE_LOW status. | |
2163 | * | |
2164 | * This function is to be called from contexts that can sleep. | |
2165 | */ | |
2166 | void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value) | |
d2876d08 | 2167 | { |
d2876d08 | 2168 | might_sleep_if(extra_checks); |
bcabdef1 AC |
2169 | if (!desc) |
2170 | return; | |
79a9becd | 2171 | _gpiod_set_raw_value(desc, value); |
d2876d08 | 2172 | } |
79a9becd | 2173 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep); |
d2876d08 | 2174 | |
79a9becd AC |
2175 | /** |
2176 | * gpiod_set_value_cansleep() - assign a gpio's value | |
2177 | * @desc: gpio whose value will be assigned | |
2178 | * @value: value to assign | |
2179 | * | |
2180 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
2181 | * account | |
2182 | * | |
2183 | * This function is to be called from contexts that can sleep. | |
2184 | */ | |
2185 | void gpiod_set_value_cansleep(struct gpio_desc *desc, int value) | |
372e722e | 2186 | { |
79a9becd AC |
2187 | might_sleep_if(extra_checks); |
2188 | if (!desc) | |
2189 | return; | |
2190 | ||
2191 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
2192 | value = !value; | |
2193 | _gpiod_set_raw_value(desc, value); | |
372e722e | 2194 | } |
79a9becd | 2195 | EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep); |
d2876d08 | 2196 | |
bae48da2 AC |
2197 | /** |
2198 | * gpiod_add_table() - register GPIO device consumers | |
2199 | * @table: array of consumers to register | |
2200 | * @num: number of consumers in table | |
2201 | */ | |
2202 | void gpiod_add_table(struct gpiod_lookup *table, size_t size) | |
2203 | { | |
2204 | mutex_lock(&gpio_lookup_lock); | |
2205 | ||
2206 | while (size--) { | |
2207 | list_add_tail(&table->list, &gpio_lookup_list); | |
2208 | table++; | |
2209 | } | |
2210 | ||
2211 | mutex_unlock(&gpio_lookup_lock); | |
2212 | } | |
2213 | ||
2214 | /* | |
2215 | * Caller must have a acquired gpio_lookup_lock | |
2216 | */ | |
2217 | static struct gpio_chip *find_chip_by_name(const char *name) | |
2218 | { | |
2219 | struct gpio_chip *chip = NULL; | |
2220 | ||
2221 | list_for_each_entry(chip, &gpio_lookup_list, list) { | |
2222 | if (chip->label == NULL) | |
2223 | continue; | |
2224 | if (!strcmp(chip->label, name)) | |
2225 | break; | |
2226 | } | |
2227 | ||
2228 | return chip; | |
2229 | } | |
2230 | ||
2231 | #ifdef CONFIG_OF | |
2232 | static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, | |
2233 | unsigned int idx, unsigned long *flags) | |
2234 | { | |
2235 | char prop_name[32]; /* 32 is max size of property name */ | |
2236 | enum of_gpio_flags of_flags; | |
2237 | struct gpio_desc *desc; | |
2238 | ||
2239 | if (con_id) | |
2240 | snprintf(prop_name, 32, "%s-gpios", con_id); | |
2241 | else | |
2242 | snprintf(prop_name, 32, "gpios"); | |
2243 | ||
2244 | desc = of_get_named_gpiod_flags(dev->of_node, prop_name, idx, | |
2245 | &of_flags); | |
2246 | ||
2247 | if (IS_ERR(desc)) | |
2248 | return desc; | |
2249 | ||
2250 | if (of_flags & OF_GPIO_ACTIVE_LOW) | |
2251 | *flags |= GPIOF_ACTIVE_LOW; | |
2252 | ||
2253 | return desc; | |
2254 | } | |
2255 | #else | |
2256 | static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, | |
2257 | unsigned int idx, unsigned long *flags) | |
2258 | { | |
2259 | return ERR_PTR(-ENODEV); | |
2260 | } | |
2261 | #endif | |
2262 | ||
2263 | static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id, | |
2264 | unsigned int idx, unsigned long *flags) | |
2265 | { | |
2266 | const char *dev_id = dev ? dev_name(dev) : NULL; | |
2267 | struct gpio_desc *desc = ERR_PTR(-ENODEV); | |
2268 | unsigned int match, best = 0; | |
2269 | struct gpiod_lookup *p; | |
2270 | ||
2271 | mutex_lock(&gpio_lookup_lock); | |
2272 | ||
2273 | list_for_each_entry(p, &gpio_lookup_list, list) { | |
2274 | match = 0; | |
2275 | ||
2276 | if (p->dev_id) { | |
2277 | if (!dev_id || strcmp(p->dev_id, dev_id)) | |
2278 | continue; | |
2279 | ||
2280 | match += 2; | |
2281 | } | |
2282 | ||
2283 | if (p->con_id) { | |
2284 | if (!con_id || strcmp(p->con_id, con_id)) | |
2285 | continue; | |
2286 | ||
2287 | match += 1; | |
2288 | } | |
2289 | ||
2290 | if (p->idx != idx) | |
2291 | continue; | |
2292 | ||
2293 | if (match > best) { | |
2294 | struct gpio_chip *chip; | |
2295 | ||
2296 | chip = find_chip_by_name(p->chip_label); | |
2297 | ||
2298 | if (!chip) { | |
2299 | dev_warn(dev, "cannot find GPIO chip %s\n", | |
2300 | p->chip_label); | |
2301 | continue; | |
2302 | } | |
2303 | ||
2304 | if (chip->ngpio >= p->chip_hwnum) { | |
2305 | dev_warn(dev, "GPIO chip %s has %d GPIOs\n", | |
2306 | chip->label, chip->ngpio); | |
2307 | continue; | |
2308 | } | |
2309 | ||
2310 | desc = gpio_to_desc(chip->base + p->chip_hwnum); | |
2311 | *flags = p->flags; | |
2312 | ||
2313 | if (match != 3) | |
2314 | best = match; | |
2315 | else | |
2316 | break; | |
2317 | } | |
2318 | } | |
2319 | ||
2320 | mutex_unlock(&gpio_lookup_lock); | |
2321 | ||
2322 | return desc; | |
2323 | } | |
2324 | ||
2325 | /** | |
2326 | * gpio_get - obtain a GPIO for a given GPIO function | |
2327 | * @dev: GPIO consumer | |
2328 | * @con_id: function within the GPIO consumer | |
2329 | * | |
2330 | * Return the GPIO descriptor corresponding to the function con_id of device | |
2331 | * dev, or an IS_ERR() condition if an error occured. | |
2332 | */ | |
2333 | struct gpio_desc *__must_check gpiod_get(struct device *dev, const char *con_id) | |
2334 | { | |
2335 | return gpiod_get_index(dev, con_id, 0); | |
2336 | } | |
2337 | EXPORT_SYMBOL_GPL(gpiod_get); | |
2338 | ||
2339 | /** | |
2340 | * gpiod_get_index - obtain a GPIO from a multi-index GPIO function | |
2341 | * @dev: GPIO consumer | |
2342 | * @con_id: function within the GPIO consumer | |
2343 | * @idx: index of the GPIO to obtain in the consumer | |
2344 | * | |
2345 | * This variant of gpiod_get() allows to access GPIOs other than the first | |
2346 | * defined one for functions that define several GPIOs. | |
2347 | * | |
2348 | * Return a valid GPIO descriptor, or an IS_ERR() condition in case of error. | |
2349 | */ | |
2350 | struct gpio_desc *__must_check gpiod_get_index(struct device *dev, | |
2351 | const char *con_id, | |
2352 | unsigned int idx) | |
2353 | { | |
2354 | struct gpio_desc *desc; | |
2355 | int status; | |
2356 | unsigned long flags = 0; | |
2357 | ||
2358 | dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id); | |
2359 | ||
2360 | /* Using device tree? */ | |
2361 | if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node) { | |
2362 | dev_dbg(dev, "using device tree for GPIO lookup\n"); | |
2363 | desc = of_find_gpio(dev, con_id, idx, &flags); | |
2364 | } else { | |
2365 | dev_dbg(dev, "using lookup tables for GPIO lookup"); | |
2366 | desc = gpiod_find(dev, con_id, idx, &flags); | |
2367 | } | |
2368 | ||
2369 | if (IS_ERR(desc)) { | |
2370 | dev_warn(dev, "lookup for GPIO %s failed\n", con_id); | |
2371 | return desc; | |
2372 | } | |
2373 | ||
2374 | status = gpiod_request(desc, con_id); | |
2375 | ||
2376 | if (status < 0) | |
2377 | return ERR_PTR(status); | |
2378 | ||
2379 | if (flags & GPIOF_ACTIVE_LOW) | |
2380 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
2381 | ||
2382 | return desc; | |
2383 | } | |
2384 | EXPORT_SYMBOL_GPL(gpiod_get_index); | |
2385 | ||
2386 | /** | |
2387 | * gpiod_put - dispose of a GPIO descriptor | |
2388 | * @desc: GPIO descriptor to dispose of | |
2389 | * | |
2390 | * No descriptor can be used after gpiod_put() has been called on it. | |
2391 | */ | |
2392 | void gpiod_put(struct gpio_desc *desc) | |
2393 | { | |
2394 | gpiod_free(desc); | |
2395 | } | |
2396 | EXPORT_SYMBOL_GPL(gpiod_put); | |
2397 | ||
d2876d08 DB |
2398 | #ifdef CONFIG_DEBUG_FS |
2399 | ||
d2876d08 DB |
2400 | static void gpiolib_dbg_show(struct seq_file *s, struct gpio_chip *chip) |
2401 | { | |
2402 | unsigned i; | |
2403 | unsigned gpio = chip->base; | |
6c0b4e6c | 2404 | struct gpio_desc *gdesc = &chip->desc[0]; |
d2876d08 | 2405 | int is_out; |
d468bf9e | 2406 | int is_irq; |
d2876d08 DB |
2407 | |
2408 | for (i = 0; i < chip->ngpio; i++, gpio++, gdesc++) { | |
2409 | if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) | |
2410 | continue; | |
2411 | ||
372e722e | 2412 | gpiod_get_direction(gdesc); |
d2876d08 | 2413 | is_out = test_bit(FLAG_IS_OUT, &gdesc->flags); |
d468bf9e LW |
2414 | is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags); |
2415 | seq_printf(s, " gpio-%-3d (%-20.20s) %s %s %s", | |
d2876d08 DB |
2416 | gpio, gdesc->label, |
2417 | is_out ? "out" : "in ", | |
2418 | chip->get | |
2419 | ? (chip->get(chip, i) ? "hi" : "lo") | |
d468bf9e LW |
2420 | : "? ", |
2421 | is_irq ? "IRQ" : " "); | |
d2876d08 DB |
2422 | seq_printf(s, "\n"); |
2423 | } | |
2424 | } | |
2425 | ||
f9c4a31f | 2426 | static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos) |
d2876d08 | 2427 | { |
362432ae | 2428 | unsigned long flags; |
f9c4a31f | 2429 | struct gpio_chip *chip = NULL; |
cb1650d4 | 2430 | loff_t index = *pos; |
d2876d08 | 2431 | |
f9c4a31f | 2432 | s->private = ""; |
d2876d08 | 2433 | |
362432ae | 2434 | spin_lock_irqsave(&gpio_lock, flags); |
cb1650d4 | 2435 | list_for_each_entry(chip, &gpio_chips, list) |
362432ae GL |
2436 | if (index-- == 0) { |
2437 | spin_unlock_irqrestore(&gpio_lock, flags); | |
cb1650d4 | 2438 | return chip; |
f9c4a31f | 2439 | } |
362432ae | 2440 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f | 2441 | |
cb1650d4 | 2442 | return NULL; |
f9c4a31f TR |
2443 | } |
2444 | ||
2445 | static void *gpiolib_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2446 | { | |
362432ae | 2447 | unsigned long flags; |
f9c4a31f | 2448 | struct gpio_chip *chip = v; |
f9c4a31f TR |
2449 | void *ret = NULL; |
2450 | ||
362432ae | 2451 | spin_lock_irqsave(&gpio_lock, flags); |
cb1650d4 AC |
2452 | if (list_is_last(&chip->list, &gpio_chips)) |
2453 | ret = NULL; | |
2454 | else | |
2455 | ret = list_entry(chip->list.next, struct gpio_chip, list); | |
362432ae | 2456 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f TR |
2457 | |
2458 | s->private = "\n"; | |
2459 | ++*pos; | |
2460 | ||
2461 | return ret; | |
2462 | } | |
2463 | ||
2464 | static void gpiolib_seq_stop(struct seq_file *s, void *v) | |
2465 | { | |
2466 | } | |
2467 | ||
2468 | static int gpiolib_seq_show(struct seq_file *s, void *v) | |
2469 | { | |
2470 | struct gpio_chip *chip = v; | |
2471 | struct device *dev; | |
2472 | ||
2473 | seq_printf(s, "%sGPIOs %d-%d", (char *)s->private, | |
2474 | chip->base, chip->base + chip->ngpio - 1); | |
2475 | dev = chip->dev; | |
2476 | if (dev) | |
2477 | seq_printf(s, ", %s/%s", dev->bus ? dev->bus->name : "no-bus", | |
2478 | dev_name(dev)); | |
2479 | if (chip->label) | |
2480 | seq_printf(s, ", %s", chip->label); | |
2481 | if (chip->can_sleep) | |
2482 | seq_printf(s, ", can sleep"); | |
2483 | seq_printf(s, ":\n"); | |
2484 | ||
2485 | if (chip->dbg_show) | |
2486 | chip->dbg_show(s, chip); | |
2487 | else | |
2488 | gpiolib_dbg_show(s, chip); | |
2489 | ||
d2876d08 DB |
2490 | return 0; |
2491 | } | |
2492 | ||
f9c4a31f TR |
2493 | static const struct seq_operations gpiolib_seq_ops = { |
2494 | .start = gpiolib_seq_start, | |
2495 | .next = gpiolib_seq_next, | |
2496 | .stop = gpiolib_seq_stop, | |
2497 | .show = gpiolib_seq_show, | |
2498 | }; | |
2499 | ||
d2876d08 DB |
2500 | static int gpiolib_open(struct inode *inode, struct file *file) |
2501 | { | |
f9c4a31f | 2502 | return seq_open(file, &gpiolib_seq_ops); |
d2876d08 DB |
2503 | } |
2504 | ||
828c0950 | 2505 | static const struct file_operations gpiolib_operations = { |
f9c4a31f | 2506 | .owner = THIS_MODULE, |
d2876d08 DB |
2507 | .open = gpiolib_open, |
2508 | .read = seq_read, | |
2509 | .llseek = seq_lseek, | |
f9c4a31f | 2510 | .release = seq_release, |
d2876d08 DB |
2511 | }; |
2512 | ||
2513 | static int __init gpiolib_debugfs_init(void) | |
2514 | { | |
2515 | /* /sys/kernel/debug/gpio */ | |
2516 | (void) debugfs_create_file("gpio", S_IFREG | S_IRUGO, | |
2517 | NULL, NULL, &gpiolib_operations); | |
2518 | return 0; | |
2519 | } | |
2520 | subsys_initcall(gpiolib_debugfs_init); | |
2521 | ||
2522 | #endif /* DEBUG_FS */ |