Commit | Line | Data |
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ae6b4d85 LW |
1 | /* |
2 | * Core driver for the pin config portions of the pin control subsystem | |
3 | * | |
4 | * Copyright (C) 2011 ST-Ericsson SA | |
5 | * Written on behalf of Linaro for ST-Ericsson | |
6 | * | |
7 | * Author: Linus Walleij <linus.walleij@linaro.org> | |
8 | * | |
9 | * License terms: GNU General Public License (GPL) version 2 | |
10 | */ | |
11 | #define pr_fmt(fmt) "pinconfig core: " fmt | |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/device.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/debugfs.h> | |
19 | #include <linux/seq_file.h> | |
20 | #include <linux/pinctrl/machine.h> | |
21 | #include <linux/pinctrl/pinctrl.h> | |
22 | #include <linux/pinctrl/pinconf.h> | |
23 | #include "core.h" | |
24 | #include "pinconf.h" | |
25 | ||
2b694250 SW |
26 | int pinconf_check_ops(struct pinctrl_dev *pctldev) |
27 | { | |
28 | const struct pinconf_ops *ops = pctldev->desc->confops; | |
29 | ||
30 | /* We must be able to read out pin status */ | |
31 | if (!ops->pin_config_get && !ops->pin_config_group_get) | |
32 | return -EINVAL; | |
33 | /* We have to be able to config the pins in SOME way */ | |
34 | if (!ops->pin_config_set && !ops->pin_config_group_set) | |
35 | return -EINVAL; | |
36 | return 0; | |
37 | } | |
38 | ||
39 | static int pin_config_get_for_pin(struct pinctrl_dev *pctldev, unsigned pin, | |
ae6b4d85 LW |
40 | unsigned long *config) |
41 | { | |
42 | const struct pinconf_ops *ops = pctldev->desc->confops; | |
43 | ||
44 | if (!ops || !ops->pin_config_get) { | |
51cd24ee | 45 | dev_err(pctldev->dev, "cannot get pin configuration, missing " |
ae6b4d85 LW |
46 | "pin_config_get() function in driver\n"); |
47 | return -EINVAL; | |
48 | } | |
49 | ||
50 | return ops->pin_config_get(pctldev, pin, config); | |
51 | } | |
52 | ||
53 | /** | |
54 | * pin_config_get() - get the configuration of a single pin parameter | |
43699dea | 55 | * @dev_name: name of the pin controller device for this pin |
ae6b4d85 LW |
56 | * @name: name of the pin to get the config for |
57 | * @config: the config pointed to by this argument will be filled in with the | |
58 | * current pin state, it can be used directly by drivers as a numeral, or | |
59 | * it can be dereferenced to any struct. | |
60 | */ | |
43699dea | 61 | int pin_config_get(const char *dev_name, const char *name, |
ae6b4d85 LW |
62 | unsigned long *config) |
63 | { | |
43699dea | 64 | struct pinctrl_dev *pctldev; |
ae6b4d85 LW |
65 | int pin; |
66 | ||
57b676f9 SW |
67 | mutex_lock(&pinctrl_mutex); |
68 | ||
9dfac4fd | 69 | pctldev = get_pinctrl_dev_from_devname(dev_name); |
57b676f9 SW |
70 | if (!pctldev) { |
71 | pin = -EINVAL; | |
72 | goto unlock; | |
73 | } | |
43699dea | 74 | |
ae6b4d85 LW |
75 | pin = pin_get_from_name(pctldev, name); |
76 | if (pin < 0) | |
57b676f9 | 77 | goto unlock; |
ae6b4d85 | 78 | |
57b676f9 SW |
79 | pin = pin_config_get_for_pin(pctldev, pin, config); |
80 | ||
81 | unlock: | |
82 | mutex_unlock(&pinctrl_mutex); | |
83 | return pin; | |
ae6b4d85 LW |
84 | } |
85 | EXPORT_SYMBOL(pin_config_get); | |
86 | ||
2b694250 | 87 | static int pin_config_set_for_pin(struct pinctrl_dev *pctldev, unsigned pin, |
ae6b4d85 LW |
88 | unsigned long config) |
89 | { | |
90 | const struct pinconf_ops *ops = pctldev->desc->confops; | |
91 | int ret; | |
92 | ||
93 | if (!ops || !ops->pin_config_set) { | |
51cd24ee | 94 | dev_err(pctldev->dev, "cannot configure pin, missing " |
ae6b4d85 LW |
95 | "config function in driver\n"); |
96 | return -EINVAL; | |
97 | } | |
98 | ||
99 | ret = ops->pin_config_set(pctldev, pin, config); | |
100 | if (ret) { | |
51cd24ee | 101 | dev_err(pctldev->dev, |
ae6b4d85 LW |
102 | "unable to set pin configuration on pin %d\n", pin); |
103 | return ret; | |
104 | } | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | /** | |
110 | * pin_config_set() - set the configuration of a single pin parameter | |
43699dea | 111 | * @dev_name: name of pin controller device for this pin |
ae6b4d85 LW |
112 | * @name: name of the pin to set the config for |
113 | * @config: the config in this argument will contain the desired pin state, it | |
114 | * can be used directly by drivers as a numeral, or it can be dereferenced | |
115 | * to any struct. | |
116 | */ | |
43699dea | 117 | int pin_config_set(const char *dev_name, const char *name, |
ae6b4d85 LW |
118 | unsigned long config) |
119 | { | |
43699dea | 120 | struct pinctrl_dev *pctldev; |
57b676f9 SW |
121 | int pin, ret; |
122 | ||
123 | mutex_lock(&pinctrl_mutex); | |
ae6b4d85 | 124 | |
9dfac4fd | 125 | pctldev = get_pinctrl_dev_from_devname(dev_name); |
57b676f9 SW |
126 | if (!pctldev) { |
127 | ret = -EINVAL; | |
128 | goto unlock; | |
129 | } | |
43699dea | 130 | |
ae6b4d85 | 131 | pin = pin_get_from_name(pctldev, name); |
57b676f9 SW |
132 | if (pin < 0) { |
133 | ret = pin; | |
134 | goto unlock; | |
135 | } | |
136 | ||
137 | ret = pin_config_set_for_pin(pctldev, pin, config); | |
ae6b4d85 | 138 | |
57b676f9 SW |
139 | unlock: |
140 | mutex_unlock(&pinctrl_mutex); | |
141 | return ret; | |
ae6b4d85 LW |
142 | } |
143 | EXPORT_SYMBOL(pin_config_set); | |
144 | ||
43699dea | 145 | int pin_config_group_get(const char *dev_name, const char *pin_group, |
ae6b4d85 LW |
146 | unsigned long *config) |
147 | { | |
43699dea SW |
148 | struct pinctrl_dev *pctldev; |
149 | const struct pinconf_ops *ops; | |
57b676f9 SW |
150 | int selector, ret; |
151 | ||
152 | mutex_lock(&pinctrl_mutex); | |
ae6b4d85 | 153 | |
9dfac4fd | 154 | pctldev = get_pinctrl_dev_from_devname(dev_name); |
57b676f9 SW |
155 | if (!pctldev) { |
156 | ret = -EINVAL; | |
157 | goto unlock; | |
158 | } | |
43699dea SW |
159 | ops = pctldev->desc->confops; |
160 | ||
ae6b4d85 | 161 | if (!ops || !ops->pin_config_group_get) { |
51cd24ee | 162 | dev_err(pctldev->dev, "cannot get configuration for pin " |
ae6b4d85 LW |
163 | "group, missing group config get function in " |
164 | "driver\n"); | |
57b676f9 SW |
165 | ret = -EINVAL; |
166 | goto unlock; | |
ae6b4d85 LW |
167 | } |
168 | ||
169 | selector = pinctrl_get_group_selector(pctldev, pin_group); | |
57b676f9 SW |
170 | if (selector < 0) { |
171 | ret = selector; | |
172 | goto unlock; | |
173 | } | |
ae6b4d85 | 174 | |
57b676f9 SW |
175 | ret = ops->pin_config_group_get(pctldev, selector, config); |
176 | ||
177 | unlock: | |
178 | mutex_unlock(&pinctrl_mutex); | |
179 | return ret; | |
ae6b4d85 LW |
180 | } |
181 | EXPORT_SYMBOL(pin_config_group_get); | |
182 | ||
43699dea | 183 | int pin_config_group_set(const char *dev_name, const char *pin_group, |
ae6b4d85 LW |
184 | unsigned long config) |
185 | { | |
43699dea SW |
186 | struct pinctrl_dev *pctldev; |
187 | const struct pinconf_ops *ops; | |
188 | const struct pinctrl_ops *pctlops; | |
ae6b4d85 LW |
189 | int selector; |
190 | const unsigned *pins; | |
191 | unsigned num_pins; | |
192 | int ret; | |
193 | int i; | |
194 | ||
57b676f9 SW |
195 | mutex_lock(&pinctrl_mutex); |
196 | ||
9dfac4fd | 197 | pctldev = get_pinctrl_dev_from_devname(dev_name); |
57b676f9 SW |
198 | if (!pctldev) { |
199 | ret = -EINVAL; | |
200 | goto unlock; | |
201 | } | |
43699dea SW |
202 | ops = pctldev->desc->confops; |
203 | pctlops = pctldev->desc->pctlops; | |
204 | ||
ae6b4d85 | 205 | if (!ops || (!ops->pin_config_group_set && !ops->pin_config_set)) { |
51cd24ee | 206 | dev_err(pctldev->dev, "cannot configure pin group, missing " |
ae6b4d85 | 207 | "config function in driver\n"); |
57b676f9 SW |
208 | ret = -EINVAL; |
209 | goto unlock; | |
ae6b4d85 LW |
210 | } |
211 | ||
212 | selector = pinctrl_get_group_selector(pctldev, pin_group); | |
57b676f9 SW |
213 | if (selector < 0) { |
214 | ret = selector; | |
215 | goto unlock; | |
216 | } | |
ae6b4d85 LW |
217 | |
218 | ret = pctlops->get_group_pins(pctldev, selector, &pins, &num_pins); | |
219 | if (ret) { | |
51cd24ee | 220 | dev_err(pctldev->dev, "cannot configure pin group, error " |
ae6b4d85 | 221 | "getting pins\n"); |
57b676f9 | 222 | goto unlock; |
ae6b4d85 LW |
223 | } |
224 | ||
225 | /* | |
226 | * If the pin controller supports handling entire groups we use that | |
227 | * capability. | |
228 | */ | |
229 | if (ops->pin_config_group_set) { | |
230 | ret = ops->pin_config_group_set(pctldev, selector, config); | |
231 | /* | |
232 | * If the pin controller prefer that a certain group be handled | |
233 | * pin-by-pin as well, it returns -EAGAIN. | |
234 | */ | |
235 | if (ret != -EAGAIN) | |
57b676f9 | 236 | goto unlock; |
ae6b4d85 LW |
237 | } |
238 | ||
239 | /* | |
240 | * If the controller cannot handle entire groups, we configure each pin | |
241 | * individually. | |
242 | */ | |
57b676f9 SW |
243 | if (!ops->pin_config_set) { |
244 | ret = 0; | |
245 | goto unlock; | |
246 | } | |
ae6b4d85 LW |
247 | |
248 | for (i = 0; i < num_pins; i++) { | |
249 | ret = ops->pin_config_set(pctldev, pins[i], config); | |
250 | if (ret < 0) | |
57b676f9 | 251 | goto unlock; |
ae6b4d85 LW |
252 | } |
253 | ||
57b676f9 SW |
254 | ret = 0; |
255 | ||
256 | unlock: | |
257 | mutex_unlock(&pinctrl_mutex); | |
258 | ||
259 | return ret; | |
ae6b4d85 LW |
260 | } |
261 | EXPORT_SYMBOL(pin_config_group_set); | |
262 | ||
ae6b4d85 LW |
263 | #ifdef CONFIG_DEBUG_FS |
264 | ||
265 | static void pinconf_dump_pin(struct pinctrl_dev *pctldev, | |
266 | struct seq_file *s, int pin) | |
267 | { | |
268 | const struct pinconf_ops *ops = pctldev->desc->confops; | |
269 | ||
270 | if (ops && ops->pin_config_dbg_show) | |
271 | ops->pin_config_dbg_show(pctldev, s, pin); | |
272 | } | |
273 | ||
274 | static int pinconf_pins_show(struct seq_file *s, void *what) | |
275 | { | |
276 | struct pinctrl_dev *pctldev = s->private; | |
706e8520 | 277 | unsigned i, pin; |
ae6b4d85 LW |
278 | |
279 | seq_puts(s, "Pin config settings per pin\n"); | |
280 | seq_puts(s, "Format: pin (name): pinmux setting array\n"); | |
281 | ||
57b676f9 SW |
282 | mutex_lock(&pinctrl_mutex); |
283 | ||
706e8520 | 284 | /* The pin number can be retrived from the pin controller descriptor */ |
546edd83 | 285 | for (i = 0; i < pctldev->desc->npins; i++) { |
ae6b4d85 LW |
286 | struct pin_desc *desc; |
287 | ||
706e8520 | 288 | pin = pctldev->desc->pins[i].number; |
ae6b4d85 | 289 | desc = pin_desc_get(pctldev, pin); |
706e8520 | 290 | /* Skip if we cannot search the pin */ |
ae6b4d85 LW |
291 | if (desc == NULL) |
292 | continue; | |
293 | ||
294 | seq_printf(s, "pin %d (%s):", pin, | |
295 | desc->name ? desc->name : "unnamed"); | |
296 | ||
297 | pinconf_dump_pin(pctldev, s, pin); | |
298 | ||
299 | seq_printf(s, "\n"); | |
300 | } | |
301 | ||
57b676f9 SW |
302 | mutex_unlock(&pinctrl_mutex); |
303 | ||
ae6b4d85 LW |
304 | return 0; |
305 | } | |
306 | ||
307 | static void pinconf_dump_group(struct pinctrl_dev *pctldev, | |
308 | struct seq_file *s, unsigned selector, | |
309 | const char *gname) | |
310 | { | |
311 | const struct pinconf_ops *ops = pctldev->desc->confops; | |
312 | ||
313 | if (ops && ops->pin_config_group_dbg_show) | |
314 | ops->pin_config_group_dbg_show(pctldev, s, selector); | |
315 | } | |
316 | ||
317 | static int pinconf_groups_show(struct seq_file *s, void *what) | |
318 | { | |
319 | struct pinctrl_dev *pctldev = s->private; | |
320 | const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; | |
321 | const struct pinconf_ops *ops = pctldev->desc->confops; | |
322 | unsigned selector = 0; | |
323 | ||
324 | if (!ops || !ops->pin_config_group_get) | |
325 | return 0; | |
326 | ||
327 | seq_puts(s, "Pin config settings per pin group\n"); | |
328 | seq_puts(s, "Format: group (name): pinmux setting array\n"); | |
329 | ||
57b676f9 SW |
330 | mutex_lock(&pinctrl_mutex); |
331 | ||
ae6b4d85 LW |
332 | while (pctlops->list_groups(pctldev, selector) >= 0) { |
333 | const char *gname = pctlops->get_group_name(pctldev, selector); | |
334 | ||
335 | seq_printf(s, "%u (%s):", selector, gname); | |
336 | pinconf_dump_group(pctldev, s, selector, gname); | |
f7b9006f SW |
337 | seq_printf(s, "\n"); |
338 | ||
ae6b4d85 LW |
339 | selector++; |
340 | } | |
341 | ||
57b676f9 SW |
342 | mutex_unlock(&pinctrl_mutex); |
343 | ||
ae6b4d85 LW |
344 | return 0; |
345 | } | |
346 | ||
347 | static int pinconf_pins_open(struct inode *inode, struct file *file) | |
348 | { | |
349 | return single_open(file, pinconf_pins_show, inode->i_private); | |
350 | } | |
351 | ||
352 | static int pinconf_groups_open(struct inode *inode, struct file *file) | |
353 | { | |
354 | return single_open(file, pinconf_groups_show, inode->i_private); | |
355 | } | |
356 | ||
357 | static const struct file_operations pinconf_pins_ops = { | |
358 | .open = pinconf_pins_open, | |
359 | .read = seq_read, | |
360 | .llseek = seq_lseek, | |
361 | .release = single_release, | |
362 | }; | |
363 | ||
364 | static const struct file_operations pinconf_groups_ops = { | |
365 | .open = pinconf_groups_open, | |
366 | .read = seq_read, | |
367 | .llseek = seq_lseek, | |
368 | .release = single_release, | |
369 | }; | |
370 | ||
371 | void pinconf_init_device_debugfs(struct dentry *devroot, | |
372 | struct pinctrl_dev *pctldev) | |
373 | { | |
374 | debugfs_create_file("pinconf-pins", S_IFREG | S_IRUGO, | |
375 | devroot, pctldev, &pinconf_pins_ops); | |
376 | debugfs_create_file("pinconf-groups", S_IFREG | S_IRUGO, | |
377 | devroot, pctldev, &pinconf_groups_ops); | |
378 | } | |
379 | ||
380 | #endif |