blob: 4dd7722f993552a4c8cd698cdc2f8d224dc337c4 [file] [log] [blame]
Linus Walleijae6b4d82011-10-19 18:14:33 +02001/*
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>
Laurent Meunierf07512e2013-04-18 10:48:07 +020020#include <linux/uaccess.h>
Linus Walleijae6b4d82011-10-19 18:14:33 +020021#include <linux/pinctrl/machine.h>
22#include <linux/pinctrl/pinctrl.h>
23#include <linux/pinctrl/pinconf.h>
24#include "core.h"
25#include "pinconf.h"
26
Stephen Warren2b694252012-02-19 23:45:46 -070027int pinconf_check_ops(struct pinctrl_dev *pctldev)
28{
29 const struct pinconf_ops *ops = pctldev->desc->confops;
30
Stephen Warren2b694252012-02-19 23:45:46 -070031 /* We have to be able to config the pins in SOME way */
John Crispinad6e1102012-04-26 16:47:11 +020032 if (!ops->pin_config_set && !ops->pin_config_group_set) {
33 dev_err(pctldev->dev,
34 "pinconf has to be able to set a pins config\n");
Stephen Warren2b694252012-02-19 23:45:46 -070035 return -EINVAL;
John Crispinad6e1102012-04-26 16:47:11 +020036 }
Stephen Warren2b694252012-02-19 23:45:46 -070037 return 0;
38}
39
Stephen Warren1e2082b2012-03-02 13:05:48 -070040int pinconf_validate_map(struct pinctrl_map const *map, int i)
41{
42 if (!map->data.configs.group_or_pin) {
43 pr_err("failed to register map %s (%d): no group/pin given\n",
44 map->name, i);
45 return -EINVAL;
46 }
47
Dong Aishengc95df2d2012-05-14 19:06:36 +080048 if (!map->data.configs.num_configs ||
Stephen Warren1e2082b2012-03-02 13:05:48 -070049 !map->data.configs.configs) {
Dong Aishengc95df2d2012-05-14 19:06:36 +080050 pr_err("failed to register map %s (%d): no configs given\n",
Stephen Warren1e2082b2012-03-02 13:05:48 -070051 map->name, i);
52 return -EINVAL;
53 }
54
55 return 0;
56}
57
Linus Walleij394349f2011-11-24 18:27:15 +010058int pin_config_get_for_pin(struct pinctrl_dev *pctldev, unsigned pin,
Linus Walleijae6b4d82011-10-19 18:14:33 +020059 unsigned long *config)
60{
61 const struct pinconf_ops *ops = pctldev->desc->confops;
62
63 if (!ops || !ops->pin_config_get) {
Masahiro Yamadaca67f102015-07-30 17:27:44 +090064 dev_dbg(pctldev->dev,
65 "cannot get pin configuration, .pin_config_get missing in driver\n");
Alexandre Bellonic4206192013-12-09 11:38:29 +010066 return -ENOTSUPP;
Linus Walleijae6b4d82011-10-19 18:14:33 +020067 }
68
69 return ops->pin_config_get(pctldev, pin, config);
70}
71
Stephen Warren43699de2011-12-15 16:57:17 -070072int pin_config_group_get(const char *dev_name, const char *pin_group,
Linus Walleijae6b4d82011-10-19 18:14:33 +020073 unsigned long *config)
74{
Stephen Warren43699de2011-12-15 16:57:17 -070075 struct pinctrl_dev *pctldev;
76 const struct pinconf_ops *ops;
Stephen Warren57b676f2012-03-02 13:05:44 -070077 int selector, ret;
78
Linus Walleij9dfac4f2012-02-01 18:02:47 +010079 pctldev = get_pinctrl_dev_from_devname(dev_name);
Stephen Warren57b676f2012-03-02 13:05:44 -070080 if (!pctldev) {
81 ret = -EINVAL;
Patrice Chotard42fed7b2013-04-11 11:01:27 +020082 return ret;
Stephen Warren57b676f2012-03-02 13:05:44 -070083 }
Patrice Chotard42fed7b2013-04-11 11:01:27 +020084
85 mutex_lock(&pctldev->mutex);
86
Stephen Warren43699de2011-12-15 16:57:17 -070087 ops = pctldev->desc->confops;
88
Linus Walleijae6b4d82011-10-19 18:14:33 +020089 if (!ops || !ops->pin_config_group_get) {
Alexandre Bellonic4206192013-12-09 11:38:29 +010090 dev_dbg(pctldev->dev, "cannot get configuration for pin "
Linus Walleijae6b4d82011-10-19 18:14:33 +020091 "group, missing group config get function in "
92 "driver\n");
Alexandre Bellonic4206192013-12-09 11:38:29 +010093 ret = -ENOTSUPP;
Stephen Warren57b676f2012-03-02 13:05:44 -070094 goto unlock;
Linus Walleijae6b4d82011-10-19 18:14:33 +020095 }
96
97 selector = pinctrl_get_group_selector(pctldev, pin_group);
Stephen Warren57b676f2012-03-02 13:05:44 -070098 if (selector < 0) {
99 ret = selector;
100 goto unlock;
101 }
Linus Walleijae6b4d82011-10-19 18:14:33 +0200102
Stephen Warren57b676f2012-03-02 13:05:44 -0700103 ret = ops->pin_config_group_get(pctldev, selector, config);
104
105unlock:
Patrice Chotard42fed7b2013-04-11 11:01:27 +0200106 mutex_unlock(&pctldev->mutex);
Stephen Warren57b676f2012-03-02 13:05:44 -0700107 return ret;
Linus Walleijae6b4d82011-10-19 18:14:33 +0200108}
Linus Walleijae6b4d82011-10-19 18:14:33 +0200109
Stephen Warren1e2082b2012-03-02 13:05:48 -0700110int pinconf_map_to_setting(struct pinctrl_map const *map,
111 struct pinctrl_setting *setting)
112{
113 struct pinctrl_dev *pctldev = setting->pctldev;
Linus Walleij70b36372012-03-12 21:38:29 +0100114 int pin;
Stephen Warren1e2082b2012-03-02 13:05:48 -0700115
116 switch (setting->type) {
117 case PIN_MAP_TYPE_CONFIGS_PIN:
Linus Walleij70b36372012-03-12 21:38:29 +0100118 pin = pin_get_from_name(pctldev,
119 map->data.configs.group_or_pin);
120 if (pin < 0) {
121 dev_err(pctldev->dev, "could not map pin config for \"%s\"",
122 map->data.configs.group_or_pin);
123 return pin;
124 }
125 setting->data.configs.group_or_pin = pin;
Stephen Warren1e2082b2012-03-02 13:05:48 -0700126 break;
127 case PIN_MAP_TYPE_CONFIGS_GROUP:
Linus Walleij70b36372012-03-12 21:38:29 +0100128 pin = pinctrl_get_group_selector(pctldev,
129 map->data.configs.group_or_pin);
130 if (pin < 0) {
131 dev_err(pctldev->dev, "could not map group config for \"%s\"",
132 map->data.configs.group_or_pin);
133 return pin;
134 }
135 setting->data.configs.group_or_pin = pin;
Stephen Warren1e2082b2012-03-02 13:05:48 -0700136 break;
137 default:
138 return -EINVAL;
139 }
140
141 setting->data.configs.num_configs = map->data.configs.num_configs;
142 setting->data.configs.configs = map->data.configs.configs;
143
144 return 0;
145}
146
147void pinconf_free_setting(struct pinctrl_setting const *setting)
148{
149}
150
151int pinconf_apply_setting(struct pinctrl_setting const *setting)
152{
153 struct pinctrl_dev *pctldev = setting->pctldev;
154 const struct pinconf_ops *ops = pctldev->desc->confops;
Sherman Yin03b054e2013-08-27 11:32:12 -0700155 int ret;
Stephen Warren1e2082b2012-03-02 13:05:48 -0700156
157 if (!ops) {
158 dev_err(pctldev->dev, "missing confops\n");
159 return -EINVAL;
160 }
161
162 switch (setting->type) {
163 case PIN_MAP_TYPE_CONFIGS_PIN:
164 if (!ops->pin_config_set) {
165 dev_err(pctldev->dev, "missing pin_config_set op\n");
166 return -EINVAL;
167 }
Sherman Yin03b054e2013-08-27 11:32:12 -0700168 ret = ops->pin_config_set(pctldev,
169 setting->data.configs.group_or_pin,
170 setting->data.configs.configs,
171 setting->data.configs.num_configs);
172 if (ret < 0) {
173 dev_err(pctldev->dev,
174 "pin_config_set op failed for pin %d\n",
175 setting->data.configs.group_or_pin);
176 return ret;
Stephen Warren1e2082b2012-03-02 13:05:48 -0700177 }
178 break;
179 case PIN_MAP_TYPE_CONFIGS_GROUP:
180 if (!ops->pin_config_group_set) {
181 dev_err(pctldev->dev,
182 "missing pin_config_group_set op\n");
183 return -EINVAL;
184 }
Sherman Yin03b054e2013-08-27 11:32:12 -0700185 ret = ops->pin_config_group_set(pctldev,
186 setting->data.configs.group_or_pin,
187 setting->data.configs.configs,
188 setting->data.configs.num_configs);
189 if (ret < 0) {
190 dev_err(pctldev->dev,
191 "pin_config_group_set op failed for group %d\n",
192 setting->data.configs.group_or_pin);
193 return ret;
Stephen Warren1e2082b2012-03-02 13:05:48 -0700194 }
195 break;
196 default:
197 return -EINVAL;
198 }
199
200 return 0;
201}
202
Linus Walleijae6b4d82011-10-19 18:14:33 +0200203#ifdef CONFIG_DEBUG_FS
204
kbuild test robot6de52c12015-07-17 21:37:09 +0800205static void pinconf_show_config(struct seq_file *s, struct pinctrl_dev *pctldev,
Jon Hunterd96310a2015-07-14 11:17:59 +0100206 unsigned long *configs, unsigned num_configs)
Stephen Warren1e2082b2012-03-02 13:05:48 -0700207{
Stephen Warren6cb41582012-04-13 10:49:06 -0600208 const struct pinconf_ops *confops;
Stephen Warren1e2082b2012-03-02 13:05:48 -0700209 int i;
210
Stephen Warren6cb41582012-04-13 10:49:06 -0600211 if (pctldev)
212 confops = pctldev->desc->confops;
213 else
214 confops = NULL;
215
Jon Hunterd96310a2015-07-14 11:17:59 +0100216 for (i = 0; i < num_configs; i++) {
217 seq_puts(s, "config ");
218 if (confops && confops->pin_config_config_dbg_show)
219 confops->pin_config_config_dbg_show(pctldev, s,
220 configs[i]);
221 else
222 seq_printf(s, "%08lx", configs[i]);
223 seq_puts(s, "\n");
224 }
225}
226
227void pinconf_show_map(struct seq_file *s, struct pinctrl_map const *map)
228{
229 struct pinctrl_dev *pctldev;
230
231 pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name);
232
Stephen Warren1e2082b2012-03-02 13:05:48 -0700233 switch (map->type) {
234 case PIN_MAP_TYPE_CONFIGS_PIN:
235 seq_printf(s, "pin ");
236 break;
237 case PIN_MAP_TYPE_CONFIGS_GROUP:
238 seq_printf(s, "group ");
239 break;
240 default:
241 break;
242 }
243
244 seq_printf(s, "%s\n", map->data.configs.group_or_pin);
245
Jon Hunterd96310a2015-07-14 11:17:59 +0100246 pinconf_show_config(s, pctldev, map->data.configs.configs,
247 map->data.configs.num_configs);
Stephen Warren1e2082b2012-03-02 13:05:48 -0700248}
249
250void pinconf_show_setting(struct seq_file *s,
251 struct pinctrl_setting const *setting)
252{
253 struct pinctrl_dev *pctldev = setting->pctldev;
254 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
255 struct pin_desc *desc;
Stephen Warren1e2082b2012-03-02 13:05:48 -0700256
257 switch (setting->type) {
258 case PIN_MAP_TYPE_CONFIGS_PIN:
259 desc = pin_desc_get(setting->pctldev,
260 setting->data.configs.group_or_pin);
261 seq_printf(s, "pin %s (%d)",
262 desc->name ? desc->name : "unnamed",
263 setting->data.configs.group_or_pin);
264 break;
265 case PIN_MAP_TYPE_CONFIGS_GROUP:
266 seq_printf(s, "group %s (%d)",
267 pctlops->get_group_name(pctldev,
268 setting->data.configs.group_or_pin),
269 setting->data.configs.group_or_pin);
270 break;
271 default:
272 break;
273 }
274
275 /*
276 * FIXME: We should really get the pin controler to dump the config
277 * values, so they can be decoded to something meaningful.
278 */
Jon Hunterd96310a2015-07-14 11:17:59 +0100279 pinconf_show_config(s, pctldev, setting->data.configs.configs,
280 setting->data.configs.num_configs);
Stephen Warren1e2082b2012-03-02 13:05:48 -0700281}
282
Linus Walleijae6b4d82011-10-19 18:14:33 +0200283static void pinconf_dump_pin(struct pinctrl_dev *pctldev,
284 struct seq_file *s, int pin)
285{
286 const struct pinconf_ops *ops = pctldev->desc->confops;
287
Linus Walleij394349f2011-11-24 18:27:15 +0100288 /* no-op when not using generic pin config */
Soren Brinkmanndd4d01f2015-01-09 07:43:46 -0800289 pinconf_generic_dump_pins(pctldev, s, NULL, pin);
Linus Walleijae6b4d82011-10-19 18:14:33 +0200290 if (ops && ops->pin_config_dbg_show)
291 ops->pin_config_dbg_show(pctldev, s, pin);
292}
293
294static int pinconf_pins_show(struct seq_file *s, void *what)
295{
296 struct pinctrl_dev *pctldev = s->private;
Chanho Park706e8522012-01-03 16:47:50 +0900297 unsigned i, pin;
Linus Walleijae6b4d82011-10-19 18:14:33 +0200298
299 seq_puts(s, "Pin config settings per pin\n");
Dong Aisheng2aeefe02012-04-16 22:07:24 +0800300 seq_puts(s, "Format: pin (name): configs\n");
Linus Walleijae6b4d82011-10-19 18:14:33 +0200301
Patrice Chotard42fed7b2013-04-11 11:01:27 +0200302 mutex_lock(&pctldev->mutex);
Stephen Warren57b676f2012-03-02 13:05:44 -0700303
Chanho Park706e8522012-01-03 16:47:50 +0900304 /* The pin number can be retrived from the pin controller descriptor */
Stephen Warren546edd82012-01-06 13:38:31 -0700305 for (i = 0; i < pctldev->desc->npins; i++) {
Linus Walleijae6b4d82011-10-19 18:14:33 +0200306 struct pin_desc *desc;
307
Chanho Park706e8522012-01-03 16:47:50 +0900308 pin = pctldev->desc->pins[i].number;
Linus Walleijae6b4d82011-10-19 18:14:33 +0200309 desc = pin_desc_get(pctldev, pin);
Chanho Park706e8522012-01-03 16:47:50 +0900310 /* Skip if we cannot search the pin */
Linus Walleijae6b4d82011-10-19 18:14:33 +0200311 if (desc == NULL)
312 continue;
313
314 seq_printf(s, "pin %d (%s):", pin,
315 desc->name ? desc->name : "unnamed");
316
317 pinconf_dump_pin(pctldev, s, pin);
318
319 seq_printf(s, "\n");
320 }
321
Patrice Chotard42fed7b2013-04-11 11:01:27 +0200322 mutex_unlock(&pctldev->mutex);
Stephen Warren57b676f2012-03-02 13:05:44 -0700323
Linus Walleijae6b4d82011-10-19 18:14:33 +0200324 return 0;
325}
326
327static void pinconf_dump_group(struct pinctrl_dev *pctldev,
328 struct seq_file *s, unsigned selector,
329 const char *gname)
330{
331 const struct pinconf_ops *ops = pctldev->desc->confops;
332
Linus Walleij394349f2011-11-24 18:27:15 +0100333 /* no-op when not using generic pin config */
Soren Brinkmanndd4d01f2015-01-09 07:43:46 -0800334 pinconf_generic_dump_pins(pctldev, s, gname, 0);
Linus Walleijae6b4d82011-10-19 18:14:33 +0200335 if (ops && ops->pin_config_group_dbg_show)
336 ops->pin_config_group_dbg_show(pctldev, s, selector);
337}
338
339static int pinconf_groups_show(struct seq_file *s, void *what)
340{
341 struct pinctrl_dev *pctldev = s->private;
342 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
Viresh Kumard1e90e92012-03-30 11:25:40 +0530343 unsigned ngroups = pctlops->get_groups_count(pctldev);
Linus Walleijae6b4d82011-10-19 18:14:33 +0200344 unsigned selector = 0;
345
Linus Walleijae6b4d82011-10-19 18:14:33 +0200346 seq_puts(s, "Pin config settings per pin group\n");
Dong Aisheng2aeefe02012-04-16 22:07:24 +0800347 seq_puts(s, "Format: group (name): configs\n");
Linus Walleijae6b4d82011-10-19 18:14:33 +0200348
Viresh Kumard1e90e92012-03-30 11:25:40 +0530349 while (selector < ngroups) {
Linus Walleijae6b4d82011-10-19 18:14:33 +0200350 const char *gname = pctlops->get_group_name(pctldev, selector);
351
352 seq_printf(s, "%u (%s):", selector, gname);
353 pinconf_dump_group(pctldev, s, selector, gname);
Stephen Warrenf7b90062012-02-19 23:45:58 -0700354 seq_printf(s, "\n");
355
Linus Walleijae6b4d82011-10-19 18:14:33 +0200356 selector++;
357 }
358
Linus Walleijae6b4d82011-10-19 18:14:33 +0200359 return 0;
360}
361
362static int pinconf_pins_open(struct inode *inode, struct file *file)
363{
364 return single_open(file, pinconf_pins_show, inode->i_private);
365}
366
367static int pinconf_groups_open(struct inode *inode, struct file *file)
368{
369 return single_open(file, pinconf_groups_show, inode->i_private);
370}
371
372static const struct file_operations pinconf_pins_ops = {
373 .open = pinconf_pins_open,
374 .read = seq_read,
375 .llseek = seq_lseek,
376 .release = single_release,
377};
378
379static const struct file_operations pinconf_groups_ops = {
380 .open = pinconf_groups_open,
381 .read = seq_read,
382 .llseek = seq_lseek,
383 .release = single_release,
384};
385
Laurent Meunierf07512e2013-04-18 10:48:07 +0200386#define MAX_NAME_LEN 15
387
388struct dbg_cfg {
389 enum pinctrl_map_type map_type;
390 char dev_name[MAX_NAME_LEN+1];
391 char state_name[MAX_NAME_LEN+1];
392 char pin_name[MAX_NAME_LEN+1];
393};
394
395/*
396 * Goal is to keep this structure as global in order to simply read the
397 * pinconf-config file after a write to check config is as expected
398 */
399static struct dbg_cfg pinconf_dbg_conf;
400
401/**
402 * pinconf_dbg_config_print() - display the pinctrl config from the pinctrl
403 * map, of the dev/pin/state that was last written to pinconf-config file.
404 * @s: string filled in with config description
405 * @d: not used
406 */
407static int pinconf_dbg_config_print(struct seq_file *s, void *d)
408{
409 struct pinctrl_maps *maps_node;
410 const struct pinctrl_map *map;
Russell King - ARM Linux8a9dcc32013-07-28 13:13:00 +0100411 const struct pinctrl_map *found = NULL;
412 struct pinctrl_dev *pctldev;
Laurent Meunierf07512e2013-04-18 10:48:07 +0200413 struct dbg_cfg *dbg = &pinconf_dbg_conf;
Laurent Meunierd99c8052015-10-30 15:15:51 +0100414 int i;
Laurent Meunierf07512e2013-04-18 10:48:07 +0200415
Linus Walleija3862672013-05-27 15:53:32 +0200416 mutex_lock(&pinctrl_maps_mutex);
Laurent Meunierf07512e2013-04-18 10:48:07 +0200417
418 /* Parse the pinctrl map and look for the elected pin/state */
419 for_each_maps(maps_node, i, map) {
420 if (map->type != dbg->map_type)
421 continue;
422 if (strcmp(map->dev_name, dbg->dev_name))
423 continue;
424 if (strcmp(map->name, dbg->state_name))
425 continue;
426
Laurent Meunierd99c8052015-10-30 15:15:51 +0100427 if (!strcmp(map->data.configs.group_or_pin, dbg->pin_name)) {
428 /* We found the right pin */
429 found = map;
430 break;
Laurent Meunierf07512e2013-04-18 10:48:07 +0200431 }
432 }
433
434 if (!found) {
435 seq_printf(s, "No config found for dev/state/pin, expected:\n");
436 seq_printf(s, "Searched dev:%s\n", dbg->dev_name);
437 seq_printf(s, "Searched state:%s\n", dbg->state_name);
438 seq_printf(s, "Searched pin:%s\n", dbg->pin_name);
439 seq_printf(s, "Use: modify config_pin <devname> "\
440 "<state> <pinname> <value>\n");
441 goto exit;
442 }
443
Russell King - ARM Linux8a9dcc32013-07-28 13:13:00 +0100444 pctldev = get_pinctrl_dev_from_devname(found->ctrl_dev_name);
Jon Hunterd96310a2015-07-14 11:17:59 +0100445 seq_printf(s, "Dev %s has config of %s in state %s:\n",
446 dbg->dev_name, dbg->pin_name, dbg->state_name);
447 pinconf_show_config(s, pctldev, found->data.configs.configs,
448 found->data.configs.num_configs);
Laurent Meunierf07512e2013-04-18 10:48:07 +0200449
450exit:
Linus Walleija3862672013-05-27 15:53:32 +0200451 mutex_unlock(&pinctrl_maps_mutex);
Laurent Meunierf07512e2013-04-18 10:48:07 +0200452
453 return 0;
454}
455
456/**
457 * pinconf_dbg_config_write() - modify the pinctrl config in the pinctrl
458 * map, of a dev/pin/state entry based on user entries to pinconf-config
459 * @user_buf: contains the modification request with expected format:
Jon Hunter75629982015-07-14 11:17:58 +0100460 * modify <config> <devicename> <state> <name> <newvalue>
Laurent Meunierf07512e2013-04-18 10:48:07 +0200461 * modify is literal string, alternatives like add/delete not supported yet
Jon Hunter75629982015-07-14 11:17:58 +0100462 * <config> is the configuration to be changed. Supported configs are
463 * "config_pin" or "config_group", alternatives like config_mux are not
464 * supported yet.
465 * <devicename> <state> <name> are values that should match the pinctrl-maps
Laurent Meunierf07512e2013-04-18 10:48:07 +0200466 * <newvalue> reflects the new config and is driver dependant
467 */
Vincent Stehlé3b59e432013-09-16 22:50:32 +0200468static ssize_t pinconf_dbg_config_write(struct file *file,
Laurent Meunierf07512e2013-04-18 10:48:07 +0200469 const char __user *user_buf, size_t count, loff_t *ppos)
470{
471 struct pinctrl_maps *maps_node;
472 const struct pinctrl_map *map;
Russell King - ARM Linux8a9dcc32013-07-28 13:13:00 +0100473 const struct pinctrl_map *found = NULL;
474 struct pinctrl_dev *pctldev;
Laurent Meunierf07512e2013-04-18 10:48:07 +0200475 const struct pinconf_ops *confops = NULL;
476 struct dbg_cfg *dbg = &pinconf_dbg_conf;
477 const struct pinctrl_map_configs *configs;
478 char config[MAX_NAME_LEN+1];
Laurent Meunierf07512e2013-04-18 10:48:07 +0200479 char buf[128];
480 char *b = &buf[0];
481 int buf_size;
482 char *token;
483 int i;
484
485 /* Get userspace string and assure termination */
Dan Carpenter81d36c42013-09-17 13:47:54 +0300486 buf_size = min(count, sizeof(buf) - 1);
Laurent Meunierf07512e2013-04-18 10:48:07 +0200487 if (copy_from_user(buf, user_buf, buf_size))
488 return -EFAULT;
489 buf[buf_size] = 0;
490
491 /*
492 * need to parse entry and extract parameters:
493 * modify configs_pin devicename state pinname newvalue
494 */
495
496 /* Get arg: 'modify' */
497 token = strsep(&b, " ");
498 if (!token)
499 return -EINVAL;
500 if (strcmp(token, "modify"))
501 return -EINVAL;
502
Jon Hunter75629982015-07-14 11:17:58 +0100503 /*
504 * Get arg type: "config_pin" and "config_group"
505 * types are supported so far
506 */
Laurent Meunierf07512e2013-04-18 10:48:07 +0200507 token = strsep(&b, " ");
508 if (!token)
509 return -EINVAL;
Jon Hunter75629982015-07-14 11:17:58 +0100510 if (!strcmp(token, "config_pin"))
511 dbg->map_type = PIN_MAP_TYPE_CONFIGS_PIN;
512 else if (!strcmp(token, "config_group"))
513 dbg->map_type = PIN_MAP_TYPE_CONFIGS_GROUP;
514 else
Laurent Meunierf07512e2013-04-18 10:48:07 +0200515 return -EINVAL;
Laurent Meunierf07512e2013-04-18 10:48:07 +0200516
517 /* get arg 'device_name' */
518 token = strsep(&b, " ");
519 if (token == NULL)
520 return -EINVAL;
521 if (strlen(token) >= MAX_NAME_LEN)
522 return -EINVAL;
523 strncpy(dbg->dev_name, token, MAX_NAME_LEN);
524
525 /* get arg 'state_name' */
526 token = strsep(&b, " ");
527 if (token == NULL)
528 return -EINVAL;
529 if (strlen(token) >= MAX_NAME_LEN)
530 return -EINVAL;
531 strncpy(dbg->state_name, token, MAX_NAME_LEN);
532
533 /* get arg 'pin_name' */
534 token = strsep(&b, " ");
535 if (token == NULL)
536 return -EINVAL;
537 if (strlen(token) >= MAX_NAME_LEN)
538 return -EINVAL;
539 strncpy(dbg->pin_name, token, MAX_NAME_LEN);
540
541 /* get new_value of config' */
542 token = strsep(&b, " ");
543 if (token == NULL)
544 return -EINVAL;
545 if (strlen(token) >= MAX_NAME_LEN)
546 return -EINVAL;
547 strncpy(config, token, MAX_NAME_LEN);
548
Patrice Chotard42fed7b2013-04-11 11:01:27 +0200549 mutex_lock(&pinctrl_maps_mutex);
Laurent Meunierf07512e2013-04-18 10:48:07 +0200550
551 /* Parse the pinctrl map and look for the selected dev/state/pin */
552 for_each_maps(maps_node, i, map) {
553 if (strcmp(map->dev_name, dbg->dev_name))
554 continue;
555 if (map->type != dbg->map_type)
556 continue;
557 if (strcmp(map->name, dbg->state_name))
558 continue;
559
560 /* we found the right pin / state, so overwrite config */
561 if (!strcmp(map->data.configs.group_or_pin, dbg->pin_name)) {
Russell King - ARM Linux8a9dcc32013-07-28 13:13:00 +0100562 found = map;
Laurent Meunierf07512e2013-04-18 10:48:07 +0200563 break;
564 }
565 }
566
567 if (!found) {
Laurent Meunierf07512e2013-04-18 10:48:07 +0200568 count = -EINVAL;
Laurent Meuniercb6d3152013-04-24 13:05:50 +0200569 goto exit;
Laurent Meunierf07512e2013-04-18 10:48:07 +0200570 }
571
Russell King - ARM Linux8a9dcc32013-07-28 13:13:00 +0100572 pctldev = get_pinctrl_dev_from_devname(found->ctrl_dev_name);
Laurent Meunierf07512e2013-04-18 10:48:07 +0200573 if (pctldev)
574 confops = pctldev->desc->confops;
575
576 if (confops && confops->pin_config_dbg_parse_modify) {
Russell King - ARM Linux8a9dcc32013-07-28 13:13:00 +0100577 configs = &found->data.configs;
Laurent Meunierf07512e2013-04-18 10:48:07 +0200578 for (i = 0; i < configs->num_configs; i++) {
579 confops->pin_config_dbg_parse_modify(pctldev,
580 config,
581 &configs->configs[i]);
582 }
583 }
584
585exit:
Patrice Chotard42fed7b2013-04-11 11:01:27 +0200586 mutex_unlock(&pinctrl_maps_mutex);
Laurent Meunierf07512e2013-04-18 10:48:07 +0200587
588 return count;
589}
590
591static int pinconf_dbg_config_open(struct inode *inode, struct file *file)
592{
593 return single_open(file, pinconf_dbg_config_print, inode->i_private);
594}
595
596static const struct file_operations pinconf_dbg_pinconfig_fops = {
597 .open = pinconf_dbg_config_open,
598 .write = pinconf_dbg_config_write,
599 .read = seq_read,
600 .llseek = seq_lseek,
601 .release = single_release,
602 .owner = THIS_MODULE,
603};
604
Linus Walleijae6b4d82011-10-19 18:14:33 +0200605void pinconf_init_device_debugfs(struct dentry *devroot,
606 struct pinctrl_dev *pctldev)
607{
608 debugfs_create_file("pinconf-pins", S_IFREG | S_IRUGO,
609 devroot, pctldev, &pinconf_pins_ops);
610 debugfs_create_file("pinconf-groups", S_IFREG | S_IRUGO,
611 devroot, pctldev, &pinconf_groups_ops);
Laurent Meunierf07512e2013-04-18 10:48:07 +0200612 debugfs_create_file("pinconf-config", (S_IRUGO | S_IWUSR | S_IWGRP),
613 devroot, pctldev, &pinconf_dbg_pinconfig_fops);
Linus Walleijae6b4d82011-10-19 18:14:33 +0200614}
615
616#endif