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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Core driver for the pin config portions of the pin control subsystem
4 *
5 * Copyright (C) 2011 ST-Ericsson SA
6 * Written on behalf of Linaro for ST-Ericsson
7 *
8 * Author: Linus Walleij <linus.walleij@linaro.org>
9 */
10#define pr_fmt(fmt) "pinconfig core: " fmt
11
12#include <linux/array_size.h>
13#include <linux/debugfs.h>
14#include <linux/device.h>
15#include <linux/init.h>
16#include <linux/module.h>
17#include <linux/seq_file.h>
18#include <linux/slab.h>
19
20#include <linux/pinctrl/machine.h>
21#include <linux/pinctrl/pinconf.h>
22#include <linux/pinctrl/pinctrl.h>
23
24#include "core.h"
25#include "pinconf.h"
26
27int pinconf_check_ops(struct pinctrl_dev *pctldev)
28{
29 const struct pinconf_ops *ops = pctldev->desc->confops;
30
31 /* We have to be able to config the pins in SOME way */
32 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");
35 return -EINVAL;
36 }
37 return 0;
38}
39
40int pinconf_validate_map(const struct pinctrl_map *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
48 if (!map->data.configs.num_configs ||
49 !map->data.configs.configs) {
50 pr_err("failed to register map %s (%d): no configs given\n",
51 map->name, i);
52 return -EINVAL;
53 }
54
55 return 0;
56}
57
58int pin_config_get_for_pin(struct pinctrl_dev *pctldev, unsigned int pin,
59 unsigned long *config)
60{
61 const struct pinconf_ops *ops = pctldev->desc->confops;
62
63 if (!ops || !ops->pin_config_get) {
64 dev_dbg(pctldev->dev,
65 "cannot get pin configuration, .pin_config_get missing in driver\n");
66 return -ENOTSUPP;
67 }
68
69 return ops->pin_config_get(pctldev, pin, config);
70}
71
72int pin_config_group_get(const char *dev_name, const char *pin_group,
73 unsigned long *config)
74{
75 struct pinctrl_dev *pctldev;
76 const struct pinconf_ops *ops;
77 int selector, ret;
78
79 pctldev = get_pinctrl_dev_from_devname(dev_name);
80 if (!pctldev) {
81 ret = -EINVAL;
82 return ret;
83 }
84
85 mutex_lock(&pctldev->mutex);
86
87 ops = pctldev->desc->confops;
88
89 if (!ops || !ops->pin_config_group_get) {
90 dev_dbg(pctldev->dev,
91 "cannot get configuration for pin group, missing group config get function in driver\n");
92 ret = -ENOTSUPP;
93 goto unlock;
94 }
95
96 selector = pinctrl_get_group_selector(pctldev, pin_group);
97 if (selector < 0) {
98 ret = selector;
99 goto unlock;
100 }
101
102 ret = ops->pin_config_group_get(pctldev, selector, config);
103
104unlock:
105 mutex_unlock(&pctldev->mutex);
106 return ret;
107}
108
109int pinconf_map_to_setting(const struct pinctrl_map *map,
110 struct pinctrl_setting *setting)
111{
112 struct pinctrl_dev *pctldev = setting->pctldev;
113 int pin;
114
115 switch (setting->type) {
116 case PIN_MAP_TYPE_CONFIGS_PIN:
117 pin = pin_get_from_name(pctldev,
118 map->data.configs.group_or_pin);
119 if (pin < 0) {
120 dev_err(pctldev->dev, "could not map pin config for \"%s\"",
121 map->data.configs.group_or_pin);
122 return pin;
123 }
124 setting->data.configs.group_or_pin = pin;
125 break;
126 case PIN_MAP_TYPE_CONFIGS_GROUP:
127 pin = pinctrl_get_group_selector(pctldev,
128 map->data.configs.group_or_pin);
129 if (pin < 0) {
130 dev_err(pctldev->dev, "could not map group config for \"%s\"",
131 map->data.configs.group_or_pin);
132 return pin;
133 }
134 setting->data.configs.group_or_pin = pin;
135 break;
136 default:
137 return -EINVAL;
138 }
139
140 setting->data.configs.num_configs = map->data.configs.num_configs;
141 setting->data.configs.configs = map->data.configs.configs;
142
143 return 0;
144}
145
146void pinconf_free_setting(const struct pinctrl_setting *setting)
147{
148}
149
150int pinconf_apply_setting(const struct pinctrl_setting *setting)
151{
152 struct pinctrl_dev *pctldev = setting->pctldev;
153 const struct pinconf_ops *ops = pctldev->desc->confops;
154 int ret;
155
156 if (!ops) {
157 dev_err(pctldev->dev, "missing confops\n");
158 return -EINVAL;
159 }
160
161 switch (setting->type) {
162 case PIN_MAP_TYPE_CONFIGS_PIN:
163 if (!ops->pin_config_set) {
164 dev_err(pctldev->dev, "missing pin_config_set op\n");
165 return -EINVAL;
166 }
167 ret = ops->pin_config_set(pctldev,
168 setting->data.configs.group_or_pin,
169 setting->data.configs.configs,
170 setting->data.configs.num_configs);
171 if (ret < 0) {
172 dev_err(pctldev->dev,
173 "pin_config_set op failed for pin %d\n",
174 setting->data.configs.group_or_pin);
175 return ret;
176 }
177 break;
178 case PIN_MAP_TYPE_CONFIGS_GROUP:
179 if (!ops->pin_config_group_set) {
180 dev_err(pctldev->dev,
181 "missing pin_config_group_set op\n");
182 return -EINVAL;
183 }
184 ret = ops->pin_config_group_set(pctldev,
185 setting->data.configs.group_or_pin,
186 setting->data.configs.configs,
187 setting->data.configs.num_configs);
188 if (ret < 0) {
189 dev_err(pctldev->dev,
190 "pin_config_group_set op failed for group %d\n",
191 setting->data.configs.group_or_pin);
192 return ret;
193 }
194 break;
195 default:
196 return -EINVAL;
197 }
198
199 return 0;
200}
201
202int pinconf_set_config(struct pinctrl_dev *pctldev, unsigned int pin,
203 unsigned long *configs, size_t nconfigs)
204{
205 const struct pinconf_ops *ops;
206
207 ops = pctldev->desc->confops;
208 if (!ops || !ops->pin_config_set)
209 return -ENOTSUPP;
210
211 return ops->pin_config_set(pctldev, pin, configs, nconfigs);
212}
213
214#ifdef CONFIG_DEBUG_FS
215
216static void pinconf_show_config(struct seq_file *s, struct pinctrl_dev *pctldev,
217 unsigned long *configs, unsigned int num_configs)
218{
219 const struct pinconf_ops *confops;
220 int i;
221
222 if (pctldev)
223 confops = pctldev->desc->confops;
224 else
225 confops = NULL;
226
227 for (i = 0; i < num_configs; i++) {
228 seq_puts(s, "config ");
229 if (confops && confops->pin_config_config_dbg_show)
230 confops->pin_config_config_dbg_show(pctldev, s,
231 configs[i]);
232 else
233 seq_printf(s, "%08lx", configs[i]);
234 seq_putc(s, '\n');
235 }
236}
237
238void pinconf_show_map(struct seq_file *s, const struct pinctrl_map *map)
239{
240 struct pinctrl_dev *pctldev;
241
242 pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name);
243
244 switch (map->type) {
245 case PIN_MAP_TYPE_CONFIGS_PIN:
246 seq_puts(s, "pin ");
247 break;
248 case PIN_MAP_TYPE_CONFIGS_GROUP:
249 seq_puts(s, "group ");
250 break;
251 default:
252 break;
253 }
254
255 seq_printf(s, "%s\n", map->data.configs.group_or_pin);
256
257 pinconf_show_config(s, pctldev, map->data.configs.configs,
258 map->data.configs.num_configs);
259}
260
261void pinconf_show_setting(struct seq_file *s,
262 const struct pinctrl_setting *setting)
263{
264 struct pinctrl_dev *pctldev = setting->pctldev;
265 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
266 struct pin_desc *desc;
267
268 switch (setting->type) {
269 case PIN_MAP_TYPE_CONFIGS_PIN:
270 desc = pin_desc_get(setting->pctldev,
271 setting->data.configs.group_or_pin);
272 seq_printf(s, "pin %s (%d)", desc->name,
273 setting->data.configs.group_or_pin);
274 break;
275 case PIN_MAP_TYPE_CONFIGS_GROUP:
276 seq_printf(s, "group %s (%d)",
277 pctlops->get_group_name(pctldev,
278 setting->data.configs.group_or_pin),
279 setting->data.configs.group_or_pin);
280 break;
281 default:
282 break;
283 }
284
285 /*
286 * FIXME: We should really get the pin controller to dump the config
287 * values, so they can be decoded to something meaningful.
288 */
289 pinconf_show_config(s, pctldev, setting->data.configs.configs,
290 setting->data.configs.num_configs);
291}
292
293static void pinconf_dump_pin(struct pinctrl_dev *pctldev,
294 struct seq_file *s, int pin)
295{
296 const struct pinconf_ops *ops = pctldev->desc->confops;
297
298 /* no-op when not using generic pin config */
299 pinconf_generic_dump_pins(pctldev, s, NULL, pin);
300 if (ops && ops->pin_config_dbg_show)
301 ops->pin_config_dbg_show(pctldev, s, pin);
302}
303
304static int pinconf_pins_show(struct seq_file *s, void *what)
305{
306 struct pinctrl_dev *pctldev = s->private;
307 unsigned int i, pin;
308
309 seq_puts(s, "Pin config settings per pin\n");
310 seq_puts(s, "Format: pin (name): configs\n");
311
312 mutex_lock(&pctldev->mutex);
313
314 /* The pin number can be retrived from the pin controller descriptor */
315 for (i = 0; i < pctldev->desc->npins; i++) {
316 struct pin_desc *desc;
317
318 pin = pctldev->desc->pins[i].number;
319 desc = pin_desc_get(pctldev, pin);
320 /* Skip if we cannot search the pin */
321 if (!desc)
322 continue;
323
324 seq_printf(s, "pin %d (%s): ", pin, desc->name);
325
326 pinconf_dump_pin(pctldev, s, pin);
327 seq_putc(s, '\n');
328 }
329
330 mutex_unlock(&pctldev->mutex);
331
332 return 0;
333}
334
335static void pinconf_dump_group(struct pinctrl_dev *pctldev,
336 struct seq_file *s, unsigned int selector,
337 const char *gname)
338{
339 const struct pinconf_ops *ops = pctldev->desc->confops;
340
341 /* no-op when not using generic pin config */
342 pinconf_generic_dump_pins(pctldev, s, gname, 0);
343 if (ops && ops->pin_config_group_dbg_show)
344 ops->pin_config_group_dbg_show(pctldev, s, selector);
345}
346
347static int pinconf_groups_show(struct seq_file *s, void *what)
348{
349 struct pinctrl_dev *pctldev = s->private;
350 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
351 unsigned int ngroups = pctlops->get_groups_count(pctldev);
352 unsigned int selector = 0;
353
354 seq_puts(s, "Pin config settings per pin group\n");
355 seq_puts(s, "Format: group (name): configs\n");
356
357 while (selector < ngroups) {
358 const char *gname = pctlops->get_group_name(pctldev, selector);
359
360 seq_printf(s, "%u (%s): ", selector, gname);
361 pinconf_dump_group(pctldev, s, selector, gname);
362 seq_putc(s, '\n');
363 selector++;
364 }
365
366 return 0;
367}
368
369DEFINE_SHOW_ATTRIBUTE(pinconf_pins);
370DEFINE_SHOW_ATTRIBUTE(pinconf_groups);
371
372void pinconf_init_device_debugfs(struct dentry *devroot,
373 struct pinctrl_dev *pctldev)
374{
375 debugfs_create_file("pinconf-pins", 0444,
376 devroot, pctldev, &pinconf_pins_fops);
377 debugfs_create_file("pinconf-groups", 0444,
378 devroot, pctldev, &pinconf_groups_fops);
379}
380
381#endif
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/uaccess.h>
21#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
27int pinconf_check_ops(struct pinctrl_dev *pctldev)
28{
29 const struct pinconf_ops *ops = pctldev->desc->confops;
30
31 /* We have to be able to config the pins in SOME way */
32 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");
35 return -EINVAL;
36 }
37 return 0;
38}
39
40int 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
48 if (!map->data.configs.num_configs ||
49 !map->data.configs.configs) {
50 pr_err("failed to register map %s (%d): no configs given\n",
51 map->name, i);
52 return -EINVAL;
53 }
54
55 return 0;
56}
57
58int pin_config_get_for_pin(struct pinctrl_dev *pctldev, unsigned pin,
59 unsigned long *config)
60{
61 const struct pinconf_ops *ops = pctldev->desc->confops;
62
63 if (!ops || !ops->pin_config_get) {
64 dev_dbg(pctldev->dev, "cannot get pin configuration, missing "
65 "pin_config_get() function in driver\n");
66 return -ENOTSUPP;
67 }
68
69 return ops->pin_config_get(pctldev, pin, config);
70}
71
72int pin_config_group_get(const char *dev_name, const char *pin_group,
73 unsigned long *config)
74{
75 struct pinctrl_dev *pctldev;
76 const struct pinconf_ops *ops;
77 int selector, ret;
78
79 pctldev = get_pinctrl_dev_from_devname(dev_name);
80 if (!pctldev) {
81 ret = -EINVAL;
82 return ret;
83 }
84
85 mutex_lock(&pctldev->mutex);
86
87 ops = pctldev->desc->confops;
88
89 if (!ops || !ops->pin_config_group_get) {
90 dev_dbg(pctldev->dev, "cannot get configuration for pin "
91 "group, missing group config get function in "
92 "driver\n");
93 ret = -ENOTSUPP;
94 goto unlock;
95 }
96
97 selector = pinctrl_get_group_selector(pctldev, pin_group);
98 if (selector < 0) {
99 ret = selector;
100 goto unlock;
101 }
102
103 ret = ops->pin_config_group_get(pctldev, selector, config);
104
105unlock:
106 mutex_unlock(&pctldev->mutex);
107 return ret;
108}
109
110int pinconf_map_to_setting(struct pinctrl_map const *map,
111 struct pinctrl_setting *setting)
112{
113 struct pinctrl_dev *pctldev = setting->pctldev;
114 int pin;
115
116 switch (setting->type) {
117 case PIN_MAP_TYPE_CONFIGS_PIN:
118 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;
126 break;
127 case PIN_MAP_TYPE_CONFIGS_GROUP:
128 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;
136 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;
155 int ret;
156
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 }
168 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;
177 }
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 }
185 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;
194 }
195 break;
196 default:
197 return -EINVAL;
198 }
199
200 return 0;
201}
202
203#ifdef CONFIG_DEBUG_FS
204
205void pinconf_show_map(struct seq_file *s, struct pinctrl_map const *map)
206{
207 struct pinctrl_dev *pctldev;
208 const struct pinconf_ops *confops;
209 int i;
210
211 pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name);
212 if (pctldev)
213 confops = pctldev->desc->confops;
214 else
215 confops = NULL;
216
217 switch (map->type) {
218 case PIN_MAP_TYPE_CONFIGS_PIN:
219 seq_printf(s, "pin ");
220 break;
221 case PIN_MAP_TYPE_CONFIGS_GROUP:
222 seq_printf(s, "group ");
223 break;
224 default:
225 break;
226 }
227
228 seq_printf(s, "%s\n", map->data.configs.group_or_pin);
229
230 for (i = 0; i < map->data.configs.num_configs; i++) {
231 seq_printf(s, "config ");
232 if (confops && confops->pin_config_config_dbg_show)
233 confops->pin_config_config_dbg_show(pctldev, s,
234 map->data.configs.configs[i]);
235 else
236 seq_printf(s, "%08lx", map->data.configs.configs[i]);
237 seq_printf(s, "\n");
238 }
239}
240
241void pinconf_show_setting(struct seq_file *s,
242 struct pinctrl_setting const *setting)
243{
244 struct pinctrl_dev *pctldev = setting->pctldev;
245 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
246 const struct pinconf_ops *confops = pctldev->desc->confops;
247 struct pin_desc *desc;
248 int i;
249
250 switch (setting->type) {
251 case PIN_MAP_TYPE_CONFIGS_PIN:
252 desc = pin_desc_get(setting->pctldev,
253 setting->data.configs.group_or_pin);
254 seq_printf(s, "pin %s (%d)",
255 desc->name ? desc->name : "unnamed",
256 setting->data.configs.group_or_pin);
257 break;
258 case PIN_MAP_TYPE_CONFIGS_GROUP:
259 seq_printf(s, "group %s (%d)",
260 pctlops->get_group_name(pctldev,
261 setting->data.configs.group_or_pin),
262 setting->data.configs.group_or_pin);
263 break;
264 default:
265 break;
266 }
267
268 /*
269 * FIXME: We should really get the pin controler to dump the config
270 * values, so they can be decoded to something meaningful.
271 */
272 for (i = 0; i < setting->data.configs.num_configs; i++) {
273 seq_printf(s, " ");
274 if (confops && confops->pin_config_config_dbg_show)
275 confops->pin_config_config_dbg_show(pctldev, s,
276 setting->data.configs.configs[i]);
277 else
278 seq_printf(s, "%08lx",
279 setting->data.configs.configs[i]);
280 }
281
282 seq_printf(s, "\n");
283}
284
285static void pinconf_dump_pin(struct pinctrl_dev *pctldev,
286 struct seq_file *s, int pin)
287{
288 const struct pinconf_ops *ops = pctldev->desc->confops;
289
290 /* no-op when not using generic pin config */
291 pinconf_generic_dump_pin(pctldev, s, pin);
292 if (ops && ops->pin_config_dbg_show)
293 ops->pin_config_dbg_show(pctldev, s, pin);
294}
295
296static int pinconf_pins_show(struct seq_file *s, void *what)
297{
298 struct pinctrl_dev *pctldev = s->private;
299 unsigned i, pin;
300
301 seq_puts(s, "Pin config settings per pin\n");
302 seq_puts(s, "Format: pin (name): configs\n");
303
304 mutex_lock(&pctldev->mutex);
305
306 /* The pin number can be retrived from the pin controller descriptor */
307 for (i = 0; i < pctldev->desc->npins; i++) {
308 struct pin_desc *desc;
309
310 pin = pctldev->desc->pins[i].number;
311 desc = pin_desc_get(pctldev, pin);
312 /* Skip if we cannot search the pin */
313 if (desc == NULL)
314 continue;
315
316 seq_printf(s, "pin %d (%s):", pin,
317 desc->name ? desc->name : "unnamed");
318
319 pinconf_dump_pin(pctldev, s, pin);
320
321 seq_printf(s, "\n");
322 }
323
324 mutex_unlock(&pctldev->mutex);
325
326 return 0;
327}
328
329static void pinconf_dump_group(struct pinctrl_dev *pctldev,
330 struct seq_file *s, unsigned selector,
331 const char *gname)
332{
333 const struct pinconf_ops *ops = pctldev->desc->confops;
334
335 /* no-op when not using generic pin config */
336 pinconf_generic_dump_group(pctldev, s, gname);
337 if (ops && ops->pin_config_group_dbg_show)
338 ops->pin_config_group_dbg_show(pctldev, s, selector);
339}
340
341static int pinconf_groups_show(struct seq_file *s, void *what)
342{
343 struct pinctrl_dev *pctldev = s->private;
344 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
345 unsigned ngroups = pctlops->get_groups_count(pctldev);
346 unsigned selector = 0;
347
348 seq_puts(s, "Pin config settings per pin group\n");
349 seq_puts(s, "Format: group (name): configs\n");
350
351 while (selector < ngroups) {
352 const char *gname = pctlops->get_group_name(pctldev, selector);
353
354 seq_printf(s, "%u (%s):", selector, gname);
355 pinconf_dump_group(pctldev, s, selector, gname);
356 seq_printf(s, "\n");
357
358 selector++;
359 }
360
361 return 0;
362}
363
364static int pinconf_pins_open(struct inode *inode, struct file *file)
365{
366 return single_open(file, pinconf_pins_show, inode->i_private);
367}
368
369static int pinconf_groups_open(struct inode *inode, struct file *file)
370{
371 return single_open(file, pinconf_groups_show, inode->i_private);
372}
373
374static const struct file_operations pinconf_pins_ops = {
375 .open = pinconf_pins_open,
376 .read = seq_read,
377 .llseek = seq_lseek,
378 .release = single_release,
379};
380
381static const struct file_operations pinconf_groups_ops = {
382 .open = pinconf_groups_open,
383 .read = seq_read,
384 .llseek = seq_lseek,
385 .release = single_release,
386};
387
388#define MAX_NAME_LEN 15
389
390struct dbg_cfg {
391 enum pinctrl_map_type map_type;
392 char dev_name[MAX_NAME_LEN+1];
393 char state_name[MAX_NAME_LEN+1];
394 char pin_name[MAX_NAME_LEN+1];
395};
396
397/*
398 * Goal is to keep this structure as global in order to simply read the
399 * pinconf-config file after a write to check config is as expected
400 */
401static struct dbg_cfg pinconf_dbg_conf;
402
403/**
404 * pinconf_dbg_config_print() - display the pinctrl config from the pinctrl
405 * map, of the dev/pin/state that was last written to pinconf-config file.
406 * @s: string filled in with config description
407 * @d: not used
408 */
409static int pinconf_dbg_config_print(struct seq_file *s, void *d)
410{
411 struct pinctrl_maps *maps_node;
412 const struct pinctrl_map *map;
413 const struct pinctrl_map *found = NULL;
414 struct pinctrl_dev *pctldev;
415 const struct pinconf_ops *confops = NULL;
416 struct dbg_cfg *dbg = &pinconf_dbg_conf;
417 int i, j;
418 unsigned long config;
419
420 mutex_lock(&pinctrl_maps_mutex);
421
422 /* Parse the pinctrl map and look for the elected pin/state */
423 for_each_maps(maps_node, i, map) {
424 if (map->type != dbg->map_type)
425 continue;
426 if (strcmp(map->dev_name, dbg->dev_name))
427 continue;
428 if (strcmp(map->name, dbg->state_name))
429 continue;
430
431 for (j = 0; j < map->data.configs.num_configs; j++) {
432 if (!strcmp(map->data.configs.group_or_pin,
433 dbg->pin_name)) {
434 /* We found the right pin / state */
435 found = map;
436 break;
437 }
438 }
439 }
440
441 if (!found) {
442 seq_printf(s, "No config found for dev/state/pin, expected:\n");
443 seq_printf(s, "Searched dev:%s\n", dbg->dev_name);
444 seq_printf(s, "Searched state:%s\n", dbg->state_name);
445 seq_printf(s, "Searched pin:%s\n", dbg->pin_name);
446 seq_printf(s, "Use: modify config_pin <devname> "\
447 "<state> <pinname> <value>\n");
448 goto exit;
449 }
450
451 pctldev = get_pinctrl_dev_from_devname(found->ctrl_dev_name);
452 config = *found->data.configs.configs;
453 seq_printf(s, "Dev %s has config of %s in state %s: 0x%08lX\n",
454 dbg->dev_name, dbg->pin_name,
455 dbg->state_name, config);
456
457 if (pctldev)
458 confops = pctldev->desc->confops;
459
460 if (confops && confops->pin_config_config_dbg_show)
461 confops->pin_config_config_dbg_show(pctldev, s, config);
462
463exit:
464 mutex_unlock(&pinctrl_maps_mutex);
465
466 return 0;
467}
468
469/**
470 * pinconf_dbg_config_write() - modify the pinctrl config in the pinctrl
471 * map, of a dev/pin/state entry based on user entries to pinconf-config
472 * @user_buf: contains the modification request with expected format:
473 * modify config_pin <devicename> <state> <pinname> <newvalue>
474 * modify is literal string, alternatives like add/delete not supported yet
475 * config_pin is literal, alternatives like config_mux not supported yet
476 * <devicename> <state> <pinname> are values that should match the pinctrl-maps
477 * <newvalue> reflects the new config and is driver dependant
478 */
479static ssize_t pinconf_dbg_config_write(struct file *file,
480 const char __user *user_buf, size_t count, loff_t *ppos)
481{
482 struct pinctrl_maps *maps_node;
483 const struct pinctrl_map *map;
484 const struct pinctrl_map *found = NULL;
485 struct pinctrl_dev *pctldev;
486 const struct pinconf_ops *confops = NULL;
487 struct dbg_cfg *dbg = &pinconf_dbg_conf;
488 const struct pinctrl_map_configs *configs;
489 char config[MAX_NAME_LEN+1];
490 char buf[128];
491 char *b = &buf[0];
492 int buf_size;
493 char *token;
494 int i;
495
496 /* Get userspace string and assure termination */
497 buf_size = min(count, sizeof(buf) - 1);
498 if (copy_from_user(buf, user_buf, buf_size))
499 return -EFAULT;
500 buf[buf_size] = 0;
501
502 /*
503 * need to parse entry and extract parameters:
504 * modify configs_pin devicename state pinname newvalue
505 */
506
507 /* Get arg: 'modify' */
508 token = strsep(&b, " ");
509 if (!token)
510 return -EINVAL;
511 if (strcmp(token, "modify"))
512 return -EINVAL;
513
514 /* Get arg type: "config_pin" type supported so far */
515 token = strsep(&b, " ");
516 if (!token)
517 return -EINVAL;
518 if (strcmp(token, "config_pin"))
519 return -EINVAL;
520 dbg->map_type = PIN_MAP_TYPE_CONFIGS_PIN;
521
522 /* get arg 'device_name' */
523 token = strsep(&b, " ");
524 if (token == NULL)
525 return -EINVAL;
526 if (strlen(token) >= MAX_NAME_LEN)
527 return -EINVAL;
528 strncpy(dbg->dev_name, token, MAX_NAME_LEN);
529
530 /* get arg 'state_name' */
531 token = strsep(&b, " ");
532 if (token == NULL)
533 return -EINVAL;
534 if (strlen(token) >= MAX_NAME_LEN)
535 return -EINVAL;
536 strncpy(dbg->state_name, token, MAX_NAME_LEN);
537
538 /* get arg 'pin_name' */
539 token = strsep(&b, " ");
540 if (token == NULL)
541 return -EINVAL;
542 if (strlen(token) >= MAX_NAME_LEN)
543 return -EINVAL;
544 strncpy(dbg->pin_name, token, MAX_NAME_LEN);
545
546 /* get new_value of config' */
547 token = strsep(&b, " ");
548 if (token == NULL)
549 return -EINVAL;
550 if (strlen(token) >= MAX_NAME_LEN)
551 return -EINVAL;
552 strncpy(config, token, MAX_NAME_LEN);
553
554 mutex_lock(&pinctrl_maps_mutex);
555
556 /* Parse the pinctrl map and look for the selected dev/state/pin */
557 for_each_maps(maps_node, i, map) {
558 if (strcmp(map->dev_name, dbg->dev_name))
559 continue;
560 if (map->type != dbg->map_type)
561 continue;
562 if (strcmp(map->name, dbg->state_name))
563 continue;
564
565 /* we found the right pin / state, so overwrite config */
566 if (!strcmp(map->data.configs.group_or_pin, dbg->pin_name)) {
567 found = map;
568 break;
569 }
570 }
571
572 if (!found) {
573 count = -EINVAL;
574 goto exit;
575 }
576
577 pctldev = get_pinctrl_dev_from_devname(found->ctrl_dev_name);
578 if (pctldev)
579 confops = pctldev->desc->confops;
580
581 if (confops && confops->pin_config_dbg_parse_modify) {
582 configs = &found->data.configs;
583 for (i = 0; i < configs->num_configs; i++) {
584 confops->pin_config_dbg_parse_modify(pctldev,
585 config,
586 &configs->configs[i]);
587 }
588 }
589
590exit:
591 mutex_unlock(&pinctrl_maps_mutex);
592
593 return count;
594}
595
596static int pinconf_dbg_config_open(struct inode *inode, struct file *file)
597{
598 return single_open(file, pinconf_dbg_config_print, inode->i_private);
599}
600
601static const struct file_operations pinconf_dbg_pinconfig_fops = {
602 .open = pinconf_dbg_config_open,
603 .write = pinconf_dbg_config_write,
604 .read = seq_read,
605 .llseek = seq_lseek,
606 .release = single_release,
607 .owner = THIS_MODULE,
608};
609
610void pinconf_init_device_debugfs(struct dentry *devroot,
611 struct pinctrl_dev *pctldev)
612{
613 debugfs_create_file("pinconf-pins", S_IFREG | S_IRUGO,
614 devroot, pctldev, &pinconf_pins_ops);
615 debugfs_create_file("pinconf-groups", S_IFREG | S_IRUGO,
616 devroot, pctldev, &pinconf_groups_ops);
617 debugfs_create_file("pinconf-config", (S_IRUGO | S_IWUSR | S_IWGRP),
618 devroot, pctldev, &pinconf_dbg_pinconfig_fops);
619}
620
621#endif