Commit | Line | Data |
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74ba9207 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
6048a3dd CM |
2 | /* |
3 | * htc-i2cpld.c | |
4 | * Chip driver for an unknown CPLD chip found on omap850 HTC devices like | |
5 | * the HTC Wizard and HTC Herald. | |
6 | * The cpld is located on the i2c bus and acts as an input/output GPIO | |
7 | * extender. | |
8 | * | |
9 | * Copyright (C) 2009 Cory Maccarrone <darkstar6262@gmail.com> | |
10 | * | |
11 | * Based on work done in the linwizard project | |
12 | * Copyright (C) 2008-2009 Angelo Arrifano <miknix@gmail.com> | |
6048a3dd CM |
13 | */ |
14 | ||
15 | #include <linux/kernel.h> | |
16 | #include <linux/init.h> | |
6048a3dd CM |
17 | #include <linux/interrupt.h> |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/i2c.h> | |
20 | #include <linux/irq.h> | |
21 | #include <linux/spinlock.h> | |
22 | #include <linux/htcpld.h> | |
23 | #include <linux/gpio.h> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
6048a3dd CM |
25 | |
26 | struct htcpld_chip { | |
27 | spinlock_t lock; | |
28 | ||
29 | /* chip info */ | |
30 | u8 reset; | |
31 | u8 addr; | |
32 | struct device *dev; | |
33 | struct i2c_client *client; | |
34 | ||
35 | /* Output details */ | |
36 | u8 cache_out; | |
37 | struct gpio_chip chip_out; | |
38 | ||
39 | /* Input details */ | |
40 | u8 cache_in; | |
41 | struct gpio_chip chip_in; | |
42 | ||
43 | u16 irqs_enabled; | |
44 | uint irq_start; | |
45 | int nirqs; | |
46 | ||
9eaee99e | 47 | unsigned int flow_type; |
6048a3dd CM |
48 | /* |
49 | * Work structure to allow for setting values outside of any | |
50 | * possible interrupt context | |
51 | */ | |
52 | struct work_struct set_val_work; | |
53 | }; | |
54 | ||
55 | struct htcpld_data { | |
56 | /* irq info */ | |
57 | u16 irqs_enabled; | |
58 | uint irq_start; | |
59 | int nirqs; | |
60 | uint chained_irq; | |
61 | unsigned int int_reset_gpio_hi; | |
62 | unsigned int int_reset_gpio_lo; | |
63 | ||
64 | /* htcpld info */ | |
65 | struct htcpld_chip *chip; | |
66 | unsigned int nchips; | |
67 | }; | |
68 | ||
69 | /* There does not appear to be a way to proactively mask interrupts | |
70 | * on the htcpld chip itself. So, we simply ignore interrupts that | |
71 | * aren't desired. */ | |
e6a4c4a4 | 72 | static void htcpld_mask(struct irq_data *data) |
6048a3dd | 73 | { |
e6a4c4a4 MB |
74 | struct htcpld_chip *chip = irq_data_get_irq_chip_data(data); |
75 | chip->irqs_enabled &= ~(1 << (data->irq - chip->irq_start)); | |
76 | pr_debug("HTCPLD mask %d %04x\n", data->irq, chip->irqs_enabled); | |
6048a3dd | 77 | } |
e6a4c4a4 | 78 | static void htcpld_unmask(struct irq_data *data) |
6048a3dd | 79 | { |
e6a4c4a4 MB |
80 | struct htcpld_chip *chip = irq_data_get_irq_chip_data(data); |
81 | chip->irqs_enabled |= 1 << (data->irq - chip->irq_start); | |
82 | pr_debug("HTCPLD unmask %d %04x\n", data->irq, chip->irqs_enabled); | |
6048a3dd CM |
83 | } |
84 | ||
e6a4c4a4 | 85 | static int htcpld_set_type(struct irq_data *data, unsigned int flags) |
6048a3dd | 86 | { |
9eaee99e | 87 | struct htcpld_chip *chip = irq_data_get_irq_chip_data(data); |
6048a3dd CM |
88 | |
89 | if (flags & ~IRQ_TYPE_SENSE_MASK) | |
90 | return -EINVAL; | |
91 | ||
92 | /* We only allow edge triggering */ | |
93 | if (flags & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)) | |
94 | return -EINVAL; | |
95 | ||
9eaee99e | 96 | chip->flow_type = flags; |
6048a3dd CM |
97 | return 0; |
98 | } | |
99 | ||
100 | static struct irq_chip htcpld_muxed_chip = { | |
e6a4c4a4 MB |
101 | .name = "htcpld", |
102 | .irq_mask = htcpld_mask, | |
103 | .irq_unmask = htcpld_unmask, | |
104 | .irq_set_type = htcpld_set_type, | |
6048a3dd CM |
105 | }; |
106 | ||
107 | /* To properly dispatch IRQ events, we need to read from the | |
108 | * chip. This is an I2C action that could possibly sleep | |
109 | * (which is bad in interrupt context) -- so we use a threaded | |
110 | * interrupt handler to get around that. | |
111 | */ | |
112 | static irqreturn_t htcpld_handler(int irq, void *dev) | |
113 | { | |
114 | struct htcpld_data *htcpld = dev; | |
115 | unsigned int i; | |
116 | unsigned long flags; | |
117 | int irqpin; | |
6048a3dd CM |
118 | |
119 | if (!htcpld) { | |
120 | pr_debug("htcpld is null in ISR\n"); | |
121 | return IRQ_HANDLED; | |
122 | } | |
123 | ||
124 | /* | |
125 | * For each chip, do a read of the chip and trigger any interrupts | |
126 | * desired. The interrupts will be triggered from LSB to MSB (i.e. | |
127 | * bit 0 first, then bit 1, etc.) | |
128 | * | |
129 | * For chips that have no interrupt range specified, just skip 'em. | |
130 | */ | |
131 | for (i = 0; i < htcpld->nchips; i++) { | |
132 | struct htcpld_chip *chip = &htcpld->chip[i]; | |
133 | struct i2c_client *client; | |
134 | int val; | |
135 | unsigned long uval, old_val; | |
136 | ||
137 | if (!chip) { | |
138 | pr_debug("chip %d is null in ISR\n", i); | |
139 | continue; | |
140 | } | |
141 | ||
142 | if (chip->nirqs == 0) | |
143 | continue; | |
144 | ||
145 | client = chip->client; | |
146 | if (!client) { | |
147 | pr_debug("client %d is null in ISR\n", i); | |
148 | continue; | |
149 | } | |
150 | ||
151 | /* Scan the chip */ | |
152 | val = i2c_smbus_read_byte_data(client, chip->cache_out); | |
153 | if (val < 0) { | |
154 | /* Throw a warning and skip this chip */ | |
155 | dev_warn(chip->dev, "Unable to read from chip: %d\n", | |
156 | val); | |
157 | continue; | |
158 | } | |
159 | ||
160 | uval = (unsigned long)val; | |
161 | ||
162 | spin_lock_irqsave(&chip->lock, flags); | |
163 | ||
164 | /* Save away the old value so we can compare it */ | |
165 | old_val = chip->cache_in; | |
166 | ||
167 | /* Write the new value */ | |
168 | chip->cache_in = uval; | |
169 | ||
170 | spin_unlock_irqrestore(&chip->lock, flags); | |
171 | ||
172 | /* | |
173 | * For each bit in the data (starting at bit 0), trigger | |
174 | * associated interrupts. | |
175 | */ | |
176 | for (irqpin = 0; irqpin < chip->nirqs; irqpin++) { | |
9eaee99e | 177 | unsigned oldb, newb, type = chip->flow_type; |
6048a3dd CM |
178 | |
179 | irq = chip->irq_start + irqpin; | |
6048a3dd CM |
180 | |
181 | /* Run the IRQ handler, but only if the bit value | |
182 | * changed, and the proper flags are set */ | |
183 | oldb = (old_val >> irqpin) & 1; | |
184 | newb = (uval >> irqpin) & 1; | |
185 | ||
9eaee99e TG |
186 | if ((!oldb && newb && (type & IRQ_TYPE_EDGE_RISING)) || |
187 | (oldb && !newb && (type & IRQ_TYPE_EDGE_FALLING))) { | |
6048a3dd | 188 | pr_debug("fire IRQ %d\n", irqpin); |
9eaee99e | 189 | generic_handle_irq(irq); |
6048a3dd CM |
190 | } |
191 | } | |
192 | } | |
193 | ||
194 | /* | |
195 | * In order to continue receiving interrupts, the int_reset_gpio must | |
196 | * be asserted. | |
197 | */ | |
198 | if (htcpld->int_reset_gpio_hi) | |
199 | gpio_set_value(htcpld->int_reset_gpio_hi, 1); | |
200 | if (htcpld->int_reset_gpio_lo) | |
201 | gpio_set_value(htcpld->int_reset_gpio_lo, 0); | |
202 | ||
203 | return IRQ_HANDLED; | |
204 | } | |
205 | ||
206 | /* | |
207 | * The GPIO set routines can be called from interrupt context, especially if, | |
208 | * for example they're attached to the led-gpio framework and a trigger is | |
209 | * enabled. As such, we declared work above in the htcpld_chip structure, | |
210 | * and that work is scheduled in the set routine. The kernel can then run | |
211 | * the I2C functions, which will sleep, in process context. | |
212 | */ | |
8d2d3a3a | 213 | static void htcpld_chip_set(struct gpio_chip *chip, unsigned offset, int val) |
6048a3dd CM |
214 | { |
215 | struct i2c_client *client; | |
ed1c9b3c | 216 | struct htcpld_chip *chip_data = gpiochip_get_data(chip); |
6048a3dd CM |
217 | unsigned long flags; |
218 | ||
6048a3dd | 219 | client = chip_data->client; |
41cc08e9 | 220 | if (!client) |
6048a3dd CM |
221 | return; |
222 | ||
223 | spin_lock_irqsave(&chip_data->lock, flags); | |
224 | if (val) | |
225 | chip_data->cache_out |= (1 << offset); | |
226 | else | |
227 | chip_data->cache_out &= ~(1 << offset); | |
228 | spin_unlock_irqrestore(&chip_data->lock, flags); | |
229 | ||
230 | schedule_work(&(chip_data->set_val_work)); | |
231 | } | |
232 | ||
8d2d3a3a | 233 | static void htcpld_chip_set_ni(struct work_struct *work) |
6048a3dd CM |
234 | { |
235 | struct htcpld_chip *chip_data; | |
236 | struct i2c_client *client; | |
237 | ||
238 | chip_data = container_of(work, struct htcpld_chip, set_val_work); | |
239 | client = chip_data->client; | |
240 | i2c_smbus_read_byte_data(client, chip_data->cache_out); | |
241 | } | |
242 | ||
8d2d3a3a | 243 | static int htcpld_chip_get(struct gpio_chip *chip, unsigned offset) |
6048a3dd | 244 | { |
ed1c9b3c | 245 | struct htcpld_chip *chip_data = gpiochip_get_data(chip); |
9b6a5ad9 | 246 | u8 cache; |
6048a3dd | 247 | |
9b6a5ad9 | 248 | if (!strncmp(chip->label, "htcpld-out", 10)) { |
9b6a5ad9 LJ |
249 | cache = chip_data->cache_out; |
250 | } else if (!strncmp(chip->label, "htcpld-in", 9)) { | |
9b6a5ad9 LJ |
251 | cache = chip_data->cache_in; |
252 | } else | |
253 | return -EINVAL; | |
6048a3dd | 254 | |
9b6a5ad9 | 255 | return (cache >> offset) & 1; |
6048a3dd CM |
256 | } |
257 | ||
258 | static int htcpld_direction_output(struct gpio_chip *chip, | |
259 | unsigned offset, int value) | |
260 | { | |
261 | htcpld_chip_set(chip, offset, value); | |
262 | return 0; | |
263 | } | |
264 | ||
265 | static int htcpld_direction_input(struct gpio_chip *chip, | |
266 | unsigned offset) | |
267 | { | |
268 | /* | |
269 | * No-op: this function can only be called on the input chip. | |
270 | * We do however make sure the offset is within range. | |
271 | */ | |
272 | return (offset < chip->ngpio) ? 0 : -EINVAL; | |
273 | } | |
274 | ||
8d2d3a3a | 275 | static int htcpld_chip_to_irq(struct gpio_chip *chip, unsigned offset) |
6048a3dd | 276 | { |
ed1c9b3c | 277 | struct htcpld_chip *chip_data = gpiochip_get_data(chip); |
6048a3dd CM |
278 | |
279 | if (offset < chip_data->nirqs) | |
280 | return chip_data->irq_start + offset; | |
281 | else | |
282 | return -EINVAL; | |
283 | } | |
284 | ||
8d2d3a3a | 285 | static void htcpld_chip_reset(struct i2c_client *client) |
6048a3dd CM |
286 | { |
287 | struct htcpld_chip *chip_data = i2c_get_clientdata(client); | |
288 | if (!chip_data) | |
289 | return; | |
290 | ||
291 | i2c_smbus_read_byte_data( | |
292 | client, (chip_data->cache_out = chip_data->reset)); | |
293 | } | |
294 | ||
f791be49 | 295 | static int htcpld_setup_chip_irq( |
6048a3dd CM |
296 | struct platform_device *pdev, |
297 | int chip_index) | |
298 | { | |
299 | struct htcpld_data *htcpld; | |
6048a3dd | 300 | struct htcpld_chip *chip; |
6048a3dd | 301 | unsigned int irq, irq_end; |
6048a3dd CM |
302 | |
303 | /* Get the platform and driver data */ | |
6048a3dd CM |
304 | htcpld = platform_get_drvdata(pdev); |
305 | chip = &htcpld->chip[chip_index]; | |
6048a3dd CM |
306 | |
307 | /* Setup irq handlers */ | |
308 | irq_end = chip->irq_start + chip->nirqs; | |
309 | for (irq = chip->irq_start; irq < irq_end; irq++) { | |
d6f7ce9f TG |
310 | irq_set_chip_and_handler(irq, &htcpld_muxed_chip, |
311 | handle_simple_irq); | |
d5bb1221 | 312 | irq_set_chip_data(irq, chip); |
9bd09f34 | 313 | irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE); |
6048a3dd CM |
314 | } |
315 | ||
a48baac5 | 316 | return 0; |
6048a3dd CM |
317 | } |
318 | ||
f791be49 | 319 | static int htcpld_register_chip_i2c( |
6048a3dd CM |
320 | struct platform_device *pdev, |
321 | int chip_index) | |
322 | { | |
323 | struct htcpld_data *htcpld; | |
324 | struct device *dev = &pdev->dev; | |
325 | struct htcpld_core_platform_data *pdata; | |
326 | struct htcpld_chip *chip; | |
327 | struct htcpld_chip_platform_data *plat_chip_data; | |
328 | struct i2c_adapter *adapter; | |
329 | struct i2c_client *client; | |
330 | struct i2c_board_info info; | |
331 | ||
332 | /* Get the platform and driver data */ | |
334a41ce | 333 | pdata = dev_get_platdata(dev); |
6048a3dd CM |
334 | htcpld = platform_get_drvdata(pdev); |
335 | chip = &htcpld->chip[chip_index]; | |
336 | plat_chip_data = &pdata->chip[chip_index]; | |
337 | ||
338 | adapter = i2c_get_adapter(pdata->i2c_adapter_id); | |
41cc08e9 | 339 | if (!adapter) { |
6048a3dd CM |
340 | /* Eek, no such I2C adapter! Bail out. */ |
341 | dev_warn(dev, "Chip at i2c address 0x%x: Invalid i2c adapter %d\n", | |
342 | plat_chip_data->addr, pdata->i2c_adapter_id); | |
343 | return -ENODEV; | |
344 | } | |
345 | ||
346 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_BYTE_DATA)) { | |
347 | dev_warn(dev, "i2c adapter %d non-functional\n", | |
348 | pdata->i2c_adapter_id); | |
349 | return -EINVAL; | |
350 | } | |
351 | ||
352 | memset(&info, 0, sizeof(struct i2c_board_info)); | |
353 | info.addr = plat_chip_data->addr; | |
354 | strlcpy(info.type, "htcpld-chip", I2C_NAME_SIZE); | |
355 | info.platform_data = chip; | |
356 | ||
357 | /* Add the I2C device. This calls the probe() function. */ | |
8bc401f3 WS |
358 | client = i2c_new_client_device(adapter, &info); |
359 | if (IS_ERR(client)) { | |
6048a3dd CM |
360 | /* I2C device registration failed, contineu with the next */ |
361 | dev_warn(dev, "Unable to add I2C device for 0x%x\n", | |
362 | plat_chip_data->addr); | |
8bc401f3 | 363 | return PTR_ERR(client); |
6048a3dd CM |
364 | } |
365 | ||
366 | i2c_set_clientdata(client, chip); | |
6065c9a4 | 367 | snprintf(client->name, I2C_NAME_SIZE, "Chip_0x%x", client->addr); |
6048a3dd CM |
368 | chip->client = client; |
369 | ||
370 | /* Reset the chip */ | |
371 | htcpld_chip_reset(client); | |
372 | chip->cache_in = i2c_smbus_read_byte_data(client, chip->cache_out); | |
373 | ||
374 | return 0; | |
375 | } | |
376 | ||
f791be49 | 377 | static void htcpld_unregister_chip_i2c( |
6048a3dd CM |
378 | struct platform_device *pdev, |
379 | int chip_index) | |
380 | { | |
381 | struct htcpld_data *htcpld; | |
382 | struct htcpld_chip *chip; | |
383 | ||
384 | /* Get the platform and driver data */ | |
385 | htcpld = platform_get_drvdata(pdev); | |
386 | chip = &htcpld->chip[chip_index]; | |
387 | ||
10944222 | 388 | i2c_unregister_device(chip->client); |
6048a3dd CM |
389 | } |
390 | ||
f791be49 | 391 | static int htcpld_register_chip_gpio( |
6048a3dd CM |
392 | struct platform_device *pdev, |
393 | int chip_index) | |
394 | { | |
395 | struct htcpld_data *htcpld; | |
396 | struct device *dev = &pdev->dev; | |
397 | struct htcpld_core_platform_data *pdata; | |
398 | struct htcpld_chip *chip; | |
399 | struct htcpld_chip_platform_data *plat_chip_data; | |
400 | struct gpio_chip *gpio_chip; | |
401 | int ret = 0; | |
402 | ||
403 | /* Get the platform and driver data */ | |
334a41ce | 404 | pdata = dev_get_platdata(dev); |
6048a3dd CM |
405 | htcpld = platform_get_drvdata(pdev); |
406 | chip = &htcpld->chip[chip_index]; | |
407 | plat_chip_data = &pdata->chip[chip_index]; | |
408 | ||
409 | /* Setup the GPIO chips */ | |
410 | gpio_chip = &(chip->chip_out); | |
411 | gpio_chip->label = "htcpld-out"; | |
58383c78 | 412 | gpio_chip->parent = dev; |
6048a3dd CM |
413 | gpio_chip->owner = THIS_MODULE; |
414 | gpio_chip->get = htcpld_chip_get; | |
415 | gpio_chip->set = htcpld_chip_set; | |
416 | gpio_chip->direction_input = NULL; | |
417 | gpio_chip->direction_output = htcpld_direction_output; | |
418 | gpio_chip->base = plat_chip_data->gpio_out_base; | |
419 | gpio_chip->ngpio = plat_chip_data->num_gpios; | |
420 | ||
421 | gpio_chip = &(chip->chip_in); | |
422 | gpio_chip->label = "htcpld-in"; | |
58383c78 | 423 | gpio_chip->parent = dev; |
6048a3dd CM |
424 | gpio_chip->owner = THIS_MODULE; |
425 | gpio_chip->get = htcpld_chip_get; | |
426 | gpio_chip->set = NULL; | |
427 | gpio_chip->direction_input = htcpld_direction_input; | |
428 | gpio_chip->direction_output = NULL; | |
429 | gpio_chip->to_irq = htcpld_chip_to_irq; | |
430 | gpio_chip->base = plat_chip_data->gpio_in_base; | |
431 | gpio_chip->ngpio = plat_chip_data->num_gpios; | |
432 | ||
433 | /* Add the GPIO chips */ | |
ed1c9b3c | 434 | ret = gpiochip_add_data(&(chip->chip_out), chip); |
6048a3dd CM |
435 | if (ret) { |
436 | dev_warn(dev, "Unable to register output GPIOs for 0x%x: %d\n", | |
437 | plat_chip_data->addr, ret); | |
438 | return ret; | |
439 | } | |
440 | ||
ed1c9b3c | 441 | ret = gpiochip_add_data(&(chip->chip_in), chip); |
6048a3dd | 442 | if (ret) { |
6048a3dd CM |
443 | dev_warn(dev, "Unable to register input GPIOs for 0x%x: %d\n", |
444 | plat_chip_data->addr, ret); | |
88d5e520 | 445 | gpiochip_remove(&(chip->chip_out)); |
6048a3dd CM |
446 | return ret; |
447 | } | |
448 | ||
449 | return 0; | |
450 | } | |
451 | ||
f791be49 | 452 | static int htcpld_setup_chips(struct platform_device *pdev) |
6048a3dd CM |
453 | { |
454 | struct htcpld_data *htcpld; | |
455 | struct device *dev = &pdev->dev; | |
456 | struct htcpld_core_platform_data *pdata; | |
457 | int i; | |
458 | ||
459 | /* Get the platform and driver data */ | |
334a41ce | 460 | pdata = dev_get_platdata(dev); |
6048a3dd CM |
461 | htcpld = platform_get_drvdata(pdev); |
462 | ||
463 | /* Setup each chip's output GPIOs */ | |
464 | htcpld->nchips = pdata->num_chip; | |
a86854d0 KC |
465 | htcpld->chip = devm_kcalloc(dev, |
466 | htcpld->nchips, | |
467 | sizeof(struct htcpld_chip), | |
2b0b5e2d | 468 | GFP_KERNEL); |
2e4d5494 | 469 | if (!htcpld->chip) |
6048a3dd | 470 | return -ENOMEM; |
6048a3dd CM |
471 | |
472 | /* Add the chips as best we can */ | |
473 | for (i = 0; i < htcpld->nchips; i++) { | |
474 | int ret; | |
475 | ||
476 | /* Setup the HTCPLD chips */ | |
477 | htcpld->chip[i].reset = pdata->chip[i].reset; | |
478 | htcpld->chip[i].cache_out = pdata->chip[i].reset; | |
479 | htcpld->chip[i].cache_in = 0; | |
480 | htcpld->chip[i].dev = dev; | |
481 | htcpld->chip[i].irq_start = pdata->chip[i].irq_base; | |
482 | htcpld->chip[i].nirqs = pdata->chip[i].num_irqs; | |
483 | ||
484 | INIT_WORK(&(htcpld->chip[i].set_val_work), &htcpld_chip_set_ni); | |
485 | spin_lock_init(&(htcpld->chip[i].lock)); | |
486 | ||
487 | /* Setup the interrupts for the chip */ | |
488 | if (htcpld->chained_irq) { | |
489 | ret = htcpld_setup_chip_irq(pdev, i); | |
490 | if (ret) | |
491 | continue; | |
492 | } | |
493 | ||
494 | /* Register the chip with I2C */ | |
495 | ret = htcpld_register_chip_i2c(pdev, i); | |
496 | if (ret) | |
497 | continue; | |
498 | ||
499 | ||
500 | /* Register the chips with the GPIO subsystem */ | |
501 | ret = htcpld_register_chip_gpio(pdev, i); | |
502 | if (ret) { | |
503 | /* Unregister the chip from i2c and continue */ | |
504 | htcpld_unregister_chip_i2c(pdev, i); | |
505 | continue; | |
506 | } | |
507 | ||
508 | dev_info(dev, "Registered chip at 0x%x\n", pdata->chip[i].addr); | |
509 | } | |
510 | ||
511 | return 0; | |
512 | } | |
513 | ||
f791be49 | 514 | static int htcpld_core_probe(struct platform_device *pdev) |
6048a3dd CM |
515 | { |
516 | struct htcpld_data *htcpld; | |
517 | struct device *dev = &pdev->dev; | |
518 | struct htcpld_core_platform_data *pdata; | |
519 | struct resource *res; | |
520 | int ret = 0; | |
521 | ||
522 | if (!dev) | |
523 | return -ENODEV; | |
524 | ||
334a41ce | 525 | pdata = dev_get_platdata(dev); |
6048a3dd CM |
526 | if (!pdata) { |
527 | dev_warn(dev, "Platform data not found for htcpld core!\n"); | |
528 | return -ENXIO; | |
529 | } | |
530 | ||
2b0b5e2d | 531 | htcpld = devm_kzalloc(dev, sizeof(struct htcpld_data), GFP_KERNEL); |
6048a3dd CM |
532 | if (!htcpld) |
533 | return -ENOMEM; | |
534 | ||
535 | /* Find chained irq */ | |
6048a3dd CM |
536 | res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
537 | if (res) { | |
538 | int flags; | |
539 | htcpld->chained_irq = res->start; | |
540 | ||
541 | /* Setup the chained interrupt handler */ | |
cea2cc73 FE |
542 | flags = IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | |
543 | IRQF_ONESHOT; | |
6048a3dd CM |
544 | ret = request_threaded_irq(htcpld->chained_irq, |
545 | NULL, htcpld_handler, | |
546 | flags, pdev->name, htcpld); | |
547 | if (ret) { | |
548 | dev_warn(dev, "Unable to setup chained irq handler: %d\n", ret); | |
2b0b5e2d | 549 | return ret; |
6048a3dd CM |
550 | } else |
551 | device_init_wakeup(dev, 0); | |
552 | } | |
553 | ||
554 | /* Set the driver data */ | |
555 | platform_set_drvdata(pdev, htcpld); | |
556 | ||
557 | /* Setup the htcpld chips */ | |
558 | ret = htcpld_setup_chips(pdev); | |
559 | if (ret) | |
2b0b5e2d | 560 | return ret; |
6048a3dd CM |
561 | |
562 | /* Request the GPIO(s) for the int reset and set them up */ | |
563 | if (pdata->int_reset_gpio_hi) { | |
564 | ret = gpio_request(pdata->int_reset_gpio_hi, "htcpld-core"); | |
565 | if (ret) { | |
566 | /* | |
567 | * If it failed, that sucks, but we can probably | |
568 | * continue on without it. | |
569 | */ | |
570 | dev_warn(dev, "Unable to request int_reset_gpio_hi -- interrupts may not work\n"); | |
571 | htcpld->int_reset_gpio_hi = 0; | |
572 | } else { | |
573 | htcpld->int_reset_gpio_hi = pdata->int_reset_gpio_hi; | |
574 | gpio_set_value(htcpld->int_reset_gpio_hi, 1); | |
575 | } | |
576 | } | |
577 | ||
578 | if (pdata->int_reset_gpio_lo) { | |
579 | ret = gpio_request(pdata->int_reset_gpio_lo, "htcpld-core"); | |
580 | if (ret) { | |
581 | /* | |
582 | * If it failed, that sucks, but we can probably | |
583 | * continue on without it. | |
584 | */ | |
585 | dev_warn(dev, "Unable to request int_reset_gpio_lo -- interrupts may not work\n"); | |
586 | htcpld->int_reset_gpio_lo = 0; | |
587 | } else { | |
588 | htcpld->int_reset_gpio_lo = pdata->int_reset_gpio_lo; | |
589 | gpio_set_value(htcpld->int_reset_gpio_lo, 0); | |
590 | } | |
591 | } | |
592 | ||
593 | dev_info(dev, "Initialized successfully\n"); | |
594 | return 0; | |
6048a3dd CM |
595 | } |
596 | ||
597 | /* The I2C Driver -- used internally */ | |
598 | static const struct i2c_device_id htcpld_chip_id[] = { | |
599 | { "htcpld-chip", 0 }, | |
600 | { } | |
601 | }; | |
6048a3dd CM |
602 | |
603 | static struct i2c_driver htcpld_chip_driver = { | |
604 | .driver = { | |
605 | .name = "htcpld-chip", | |
606 | }, | |
607 | .id_table = htcpld_chip_id, | |
608 | }; | |
609 | ||
610 | /* The Core Driver */ | |
611 | static struct platform_driver htcpld_core_driver = { | |
612 | .driver = { | |
613 | .name = "i2c-htcpld", | |
614 | }, | |
615 | }; | |
616 | ||
617 | static int __init htcpld_core_init(void) | |
618 | { | |
619 | int ret; | |
620 | ||
621 | /* Register the I2C Chip driver */ | |
622 | ret = i2c_add_driver(&htcpld_chip_driver); | |
623 | if (ret) | |
624 | return ret; | |
625 | ||
626 | /* Probe for our chips */ | |
627 | return platform_driver_probe(&htcpld_core_driver, htcpld_core_probe); | |
628 | } | |
11165223 | 629 | device_initcall(htcpld_core_init); |