blob: 799048f3c8d4ec271c5c8849d3a8f17c8ac4e1ff [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);
Masahiro Yamadacf9d9942016-05-24 14:26:26 +0900261 seq_printf(s, "pin %s (%d)", desc->name,
Stephen Warren1e2082b2012-03-02 13:05:48 -0700262 setting->data.configs.group_or_pin);
263 break;
264 case PIN_MAP_TYPE_CONFIGS_GROUP:
265 seq_printf(s, "group %s (%d)",
266 pctlops->get_group_name(pctldev,
267 setting->data.configs.group_or_pin),
268 setting->data.configs.group_or_pin);
269 break;
270 default:
271 break;
272 }
273
274 /*
275 * FIXME: We should really get the pin controler to dump the config
276 * values, so they can be decoded to something meaningful.
277 */
Jon Hunterd96310a2015-07-14 11:17:59 +0100278 pinconf_show_config(s, pctldev, setting->data.configs.configs,
279 setting->data.configs.num_configs);
Stephen Warren1e2082b2012-03-02 13:05:48 -0700280}
281
Linus Walleijae6b4d82011-10-19 18:14:33 +0200282static void pinconf_dump_pin(struct pinctrl_dev *pctldev,
283 struct seq_file *s, int pin)
284{
285 const struct pinconf_ops *ops = pctldev->desc->confops;
286
Linus Walleij394349f2011-11-24 18:27:15 +0100287 /* no-op when not using generic pin config */
Soren Brinkmanndd4d01f2015-01-09 07:43:46 -0800288 pinconf_generic_dump_pins(pctldev, s, NULL, pin);
Linus Walleijae6b4d82011-10-19 18:14:33 +0200289 if (ops && ops->pin_config_dbg_show)
290 ops->pin_config_dbg_show(pctldev, s, pin);
291}
292
293static int pinconf_pins_show(struct seq_file *s, void *what)
294{
295 struct pinctrl_dev *pctldev = s->private;
Chanho Park706e8522012-01-03 16:47:50 +0900296 unsigned i, pin;
Linus Walleijae6b4d82011-10-19 18:14:33 +0200297
298 seq_puts(s, "Pin config settings per pin\n");
Dong Aisheng2aeefe02012-04-16 22:07:24 +0800299 seq_puts(s, "Format: pin (name): configs\n");
Linus Walleijae6b4d82011-10-19 18:14:33 +0200300
Patrice Chotard42fed7b2013-04-11 11:01:27 +0200301 mutex_lock(&pctldev->mutex);
Stephen Warren57b676f2012-03-02 13:05:44 -0700302
Chanho Park706e8522012-01-03 16:47:50 +0900303 /* The pin number can be retrived from the pin controller descriptor */
Stephen Warren546edd82012-01-06 13:38:31 -0700304 for (i = 0; i < pctldev->desc->npins; i++) {
Linus Walleijae6b4d82011-10-19 18:14:33 +0200305 struct pin_desc *desc;
306
Chanho Park706e8522012-01-03 16:47:50 +0900307 pin = pctldev->desc->pins[i].number;
Linus Walleijae6b4d82011-10-19 18:14:33 +0200308 desc = pin_desc_get(pctldev, pin);
Chanho Park706e8522012-01-03 16:47:50 +0900309 /* Skip if we cannot search the pin */
Linus Walleijae6b4d82011-10-19 18:14:33 +0200310 if (desc == NULL)
311 continue;
312
Masahiro Yamadaa672eb52016-05-25 15:37:27 +0900313 seq_printf(s, "pin %d (%s): ", pin, desc->name);
Linus Walleijae6b4d82011-10-19 18:14:33 +0200314
315 pinconf_dump_pin(pctldev, s, pin);
316
317 seq_printf(s, "\n");
318 }
319
Patrice Chotard42fed7b2013-04-11 11:01:27 +0200320 mutex_unlock(&pctldev->mutex);
Stephen Warren57b676f2012-03-02 13:05:44 -0700321
Linus Walleijae6b4d82011-10-19 18:14:33 +0200322 return 0;
323}
324
325static void pinconf_dump_group(struct pinctrl_dev *pctldev,
326 struct seq_file *s, unsigned selector,
327 const char *gname)
328{
329 const struct pinconf_ops *ops = pctldev->desc->confops;
330
Linus Walleij394349f2011-11-24 18:27:15 +0100331 /* no-op when not using generic pin config */
Soren Brinkmanndd4d01f2015-01-09 07:43:46 -0800332 pinconf_generic_dump_pins(pctldev, s, gname, 0);
Linus Walleijae6b4d82011-10-19 18:14:33 +0200333 if (ops && ops->pin_config_group_dbg_show)
334 ops->pin_config_group_dbg_show(pctldev, s, selector);
335}
336
337static int pinconf_groups_show(struct seq_file *s, void *what)
338{
339 struct pinctrl_dev *pctldev = s->private;
340 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
Viresh Kumard1e90e92012-03-30 11:25:40 +0530341 unsigned ngroups = pctlops->get_groups_count(pctldev);
Linus Walleijae6b4d82011-10-19 18:14:33 +0200342 unsigned selector = 0;
343
Linus Walleijae6b4d82011-10-19 18:14:33 +0200344 seq_puts(s, "Pin config settings per pin group\n");
Dong Aisheng2aeefe02012-04-16 22:07:24 +0800345 seq_puts(s, "Format: group (name): configs\n");
Linus Walleijae6b4d82011-10-19 18:14:33 +0200346
Viresh Kumard1e90e92012-03-30 11:25:40 +0530347 while (selector < ngroups) {
Linus Walleijae6b4d82011-10-19 18:14:33 +0200348 const char *gname = pctlops->get_group_name(pctldev, selector);
349
Masahiro Yamadaa672eb52016-05-25 15:37:27 +0900350 seq_printf(s, "%u (%s): ", selector, gname);
Linus Walleijae6b4d82011-10-19 18:14:33 +0200351 pinconf_dump_group(pctldev, s, selector, gname);
Stephen Warrenf7b90062012-02-19 23:45:58 -0700352 seq_printf(s, "\n");
353
Linus Walleijae6b4d82011-10-19 18:14:33 +0200354 selector++;
355 }
356
Linus Walleijae6b4d82011-10-19 18:14:33 +0200357 return 0;
358}
359
360static int pinconf_pins_open(struct inode *inode, struct file *file)
361{
362 return single_open(file, pinconf_pins_show, inode->i_private);
363}
364
365static int pinconf_groups_open(struct inode *inode, struct file *file)
366{
367 return single_open(file, pinconf_groups_show, inode->i_private);
368}
369
370static const struct file_operations pinconf_pins_ops = {
371 .open = pinconf_pins_open,
372 .read = seq_read,
373 .llseek = seq_lseek,
374 .release = single_release,
375};
376
377static const struct file_operations pinconf_groups_ops = {
378 .open = pinconf_groups_open,
379 .read = seq_read,
380 .llseek = seq_lseek,
381 .release = single_release,
382};
383
Laurent Meunierf07512e2013-04-18 10:48:07 +0200384#define MAX_NAME_LEN 15
385
386struct dbg_cfg {
387 enum pinctrl_map_type map_type;
388 char dev_name[MAX_NAME_LEN+1];
389 char state_name[MAX_NAME_LEN+1];
390 char pin_name[MAX_NAME_LEN+1];
391};
392
393/*
394 * Goal is to keep this structure as global in order to simply read the
395 * pinconf-config file after a write to check config is as expected
396 */
397static struct dbg_cfg pinconf_dbg_conf;
398
399/**
400 * pinconf_dbg_config_print() - display the pinctrl config from the pinctrl
401 * map, of the dev/pin/state that was last written to pinconf-config file.
402 * @s: string filled in with config description
403 * @d: not used
404 */
405static int pinconf_dbg_config_print(struct seq_file *s, void *d)
406{
407 struct pinctrl_maps *maps_node;
408 const struct pinctrl_map *map;
Russell King - ARM Linux8a9dcc32013-07-28 13:13:00 +0100409 const struct pinctrl_map *found = NULL;
410 struct pinctrl_dev *pctldev;
Laurent Meunierf07512e2013-04-18 10:48:07 +0200411 struct dbg_cfg *dbg = &pinconf_dbg_conf;
Laurent Meunierd99c8052015-10-30 15:15:51 +0100412 int i;
Laurent Meunierf07512e2013-04-18 10:48:07 +0200413
Linus Walleija3862672013-05-27 15:53:32 +0200414 mutex_lock(&pinctrl_maps_mutex);
Laurent Meunierf07512e2013-04-18 10:48:07 +0200415
416 /* Parse the pinctrl map and look for the elected pin/state */
417 for_each_maps(maps_node, i, map) {
418 if (map->type != dbg->map_type)
419 continue;
420 if (strcmp(map->dev_name, dbg->dev_name))
421 continue;
422 if (strcmp(map->name, dbg->state_name))
423 continue;
424
Laurent Meunierd99c8052015-10-30 15:15:51 +0100425 if (!strcmp(map->data.configs.group_or_pin, dbg->pin_name)) {
426 /* We found the right pin */
427 found = map;
428 break;
Laurent Meunierf07512e2013-04-18 10:48:07 +0200429 }
430 }
431
432 if (!found) {
433 seq_printf(s, "No config found for dev/state/pin, expected:\n");
434 seq_printf(s, "Searched dev:%s\n", dbg->dev_name);
435 seq_printf(s, "Searched state:%s\n", dbg->state_name);
436 seq_printf(s, "Searched pin:%s\n", dbg->pin_name);
437 seq_printf(s, "Use: modify config_pin <devname> "\
438 "<state> <pinname> <value>\n");
439 goto exit;
440 }
441
Russell King - ARM Linux8a9dcc32013-07-28 13:13:00 +0100442 pctldev = get_pinctrl_dev_from_devname(found->ctrl_dev_name);
Jon Hunterd96310a2015-07-14 11:17:59 +0100443 seq_printf(s, "Dev %s has config of %s in state %s:\n",
444 dbg->dev_name, dbg->pin_name, dbg->state_name);
445 pinconf_show_config(s, pctldev, found->data.configs.configs,
446 found->data.configs.num_configs);
Laurent Meunierf07512e2013-04-18 10:48:07 +0200447
448exit:
Linus Walleija3862672013-05-27 15:53:32 +0200449 mutex_unlock(&pinctrl_maps_mutex);
Laurent Meunierf07512e2013-04-18 10:48:07 +0200450
451 return 0;
452}
453
454/**
455 * pinconf_dbg_config_write() - modify the pinctrl config in the pinctrl
456 * map, of a dev/pin/state entry based on user entries to pinconf-config
457 * @user_buf: contains the modification request with expected format:
Jon Hunter75629982015-07-14 11:17:58 +0100458 * modify <config> <devicename> <state> <name> <newvalue>
Laurent Meunierf07512e2013-04-18 10:48:07 +0200459 * modify is literal string, alternatives like add/delete not supported yet
Jon Hunter75629982015-07-14 11:17:58 +0100460 * <config> is the configuration to be changed. Supported configs are
461 * "config_pin" or "config_group", alternatives like config_mux are not
462 * supported yet.
463 * <devicename> <state> <name> are values that should match the pinctrl-maps
Laurent Meunierf07512e2013-04-18 10:48:07 +0200464 * <newvalue> reflects the new config and is driver dependant
465 */
Vincent Stehlé3b59e432013-09-16 22:50:32 +0200466static ssize_t pinconf_dbg_config_write(struct file *file,
Laurent Meunierf07512e2013-04-18 10:48:07 +0200467 const char __user *user_buf, size_t count, loff_t *ppos)
468{
469 struct pinctrl_maps *maps_node;
470 const struct pinctrl_map *map;
Russell King - ARM Linux8a9dcc32013-07-28 13:13:00 +0100471 const struct pinctrl_map *found = NULL;
472 struct pinctrl_dev *pctldev;
Laurent Meunierf07512e2013-04-18 10:48:07 +0200473 const struct pinconf_ops *confops = NULL;
474 struct dbg_cfg *dbg = &pinconf_dbg_conf;
475 const struct pinctrl_map_configs *configs;
476 char config[MAX_NAME_LEN+1];
Laurent Meunierf07512e2013-04-18 10:48:07 +0200477 char buf[128];
478 char *b = &buf[0];
479 int buf_size;
480 char *token;
481 int i;
482
483 /* Get userspace string and assure termination */
Dan Carpenter81d36c42013-09-17 13:47:54 +0300484 buf_size = min(count, sizeof(buf) - 1);
Laurent Meunierf07512e2013-04-18 10:48:07 +0200485 if (copy_from_user(buf, user_buf, buf_size))
486 return -EFAULT;
487 buf[buf_size] = 0;
488
489 /*
490 * need to parse entry and extract parameters:
491 * modify configs_pin devicename state pinname newvalue
492 */
493
494 /* Get arg: 'modify' */
495 token = strsep(&b, " ");
496 if (!token)
497 return -EINVAL;
498 if (strcmp(token, "modify"))
499 return -EINVAL;
500
Jon Hunter75629982015-07-14 11:17:58 +0100501 /*
502 * Get arg type: "config_pin" and "config_group"
503 * types are supported so far
504 */
Laurent Meunierf07512e2013-04-18 10:48:07 +0200505 token = strsep(&b, " ");
506 if (!token)
507 return -EINVAL;
Jon Hunter75629982015-07-14 11:17:58 +0100508 if (!strcmp(token, "config_pin"))
509 dbg->map_type = PIN_MAP_TYPE_CONFIGS_PIN;
510 else if (!strcmp(token, "config_group"))
511 dbg->map_type = PIN_MAP_TYPE_CONFIGS_GROUP;
512 else
Laurent Meunierf07512e2013-04-18 10:48:07 +0200513 return -EINVAL;
Laurent Meunierf07512e2013-04-18 10:48:07 +0200514
515 /* get arg 'device_name' */
516 token = strsep(&b, " ");
517 if (token == NULL)
518 return -EINVAL;
519 if (strlen(token) >= MAX_NAME_LEN)
520 return -EINVAL;
521 strncpy(dbg->dev_name, token, MAX_NAME_LEN);
522
523 /* get arg 'state_name' */
524 token = strsep(&b, " ");
525 if (token == NULL)
526 return -EINVAL;
527 if (strlen(token) >= MAX_NAME_LEN)
528 return -EINVAL;
529 strncpy(dbg->state_name, token, MAX_NAME_LEN);
530
531 /* get arg 'pin_name' */
532 token = strsep(&b, " ");
533 if (token == NULL)
534 return -EINVAL;
535 if (strlen(token) >= MAX_NAME_LEN)
536 return -EINVAL;
537 strncpy(dbg->pin_name, token, MAX_NAME_LEN);
538
539 /* get new_value of config' */
540 token = strsep(&b, " ");
541 if (token == NULL)
542 return -EINVAL;
543 if (strlen(token) >= MAX_NAME_LEN)
544 return -EINVAL;
545 strncpy(config, token, MAX_NAME_LEN);
546
Patrice Chotard42fed7b2013-04-11 11:01:27 +0200547 mutex_lock(&pinctrl_maps_mutex);
Laurent Meunierf07512e2013-04-18 10:48:07 +0200548
549 /* Parse the pinctrl map and look for the selected dev/state/pin */
550 for_each_maps(maps_node, i, map) {
551 if (strcmp(map->dev_name, dbg->dev_name))
552 continue;
553 if (map->type != dbg->map_type)
554 continue;
555 if (strcmp(map->name, dbg->state_name))
556 continue;
557
558 /* we found the right pin / state, so overwrite config */
559 if (!strcmp(map->data.configs.group_or_pin, dbg->pin_name)) {
Russell King - ARM Linux8a9dcc32013-07-28 13:13:00 +0100560 found = map;
Laurent Meunierf07512e2013-04-18 10:48:07 +0200561 break;
562 }
563 }
564
565 if (!found) {
Laurent Meunierf07512e2013-04-18 10:48:07 +0200566 count = -EINVAL;
Laurent Meuniercb6d3152013-04-24 13:05:50 +0200567 goto exit;
Laurent Meunierf07512e2013-04-18 10:48:07 +0200568 }
569
Russell King - ARM Linux8a9dcc32013-07-28 13:13:00 +0100570 pctldev = get_pinctrl_dev_from_devname(found->ctrl_dev_name);
Laurent Meunierf07512e2013-04-18 10:48:07 +0200571 if (pctldev)
572 confops = pctldev->desc->confops;
573
574 if (confops && confops->pin_config_dbg_parse_modify) {
Russell King - ARM Linux8a9dcc32013-07-28 13:13:00 +0100575 configs = &found->data.configs;
Laurent Meunierf07512e2013-04-18 10:48:07 +0200576 for (i = 0; i < configs->num_configs; i++) {
577 confops->pin_config_dbg_parse_modify(pctldev,
578 config,
579 &configs->configs[i]);
580 }
581 }
582
583exit:
Patrice Chotard42fed7b2013-04-11 11:01:27 +0200584 mutex_unlock(&pinctrl_maps_mutex);
Laurent Meunierf07512e2013-04-18 10:48:07 +0200585
586 return count;
587}
588
589static int pinconf_dbg_config_open(struct inode *inode, struct file *file)
590{
591 return single_open(file, pinconf_dbg_config_print, inode->i_private);
592}
593
594static const struct file_operations pinconf_dbg_pinconfig_fops = {
595 .open = pinconf_dbg_config_open,
596 .write = pinconf_dbg_config_write,
597 .read = seq_read,
598 .llseek = seq_lseek,
599 .release = single_release,
600 .owner = THIS_MODULE,
601};
602
Linus Walleijae6b4d82011-10-19 18:14:33 +0200603void pinconf_init_device_debugfs(struct dentry *devroot,
604 struct pinctrl_dev *pctldev)
605{
606 debugfs_create_file("pinconf-pins", S_IFREG | S_IRUGO,
607 devroot, pctldev, &pinconf_pins_ops);
608 debugfs_create_file("pinconf-groups", S_IFREG | S_IRUGO,
609 devroot, pctldev, &pinconf_groups_ops);
Laurent Meunierf07512e2013-04-18 10:48:07 +0200610 debugfs_create_file("pinconf-config", (S_IRUGO | S_IWUSR | S_IWGRP),
611 devroot, pctldev, &pinconf_dbg_pinconfig_fops);
Linus Walleijae6b4d82011-10-19 18:14:33 +0200612}
613
614#endif