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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
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,
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, "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
205static void pinconf_show_config(struct seq_file *s, struct pinctrl_dev *pctldev,
206 unsigned long *configs, unsigned num_configs)
207{
208 const struct pinconf_ops *confops;
209 int i;
210
211 if (pctldev)
212 confops = pctldev->desc->confops;
213 else
214 confops = NULL;
215
216 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
233 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
246 pinconf_show_config(s, pctldev, map->data.configs.configs,
247 map->data.configs.num_configs);
248}
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;
256
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)", desc->name,
262 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
276
277
278 pinconf_show_config(s, pctldev, setting->data.configs.configs,
279 setting->data.configs.num_configs);
280}
281
282static 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
287
288 pinconf_generic_dump_pins(pctldev, s, NULL, pin);
289 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;
296 unsigned i, pin;
297
298 seq_puts(s, "Pin config settings per pin\n");
299 seq_puts(s, "Format: pin (name): configs\n");
300
301 mutex_lock(&pctldev->mutex);
302
303
304 for (i = 0; i < pctldev->desc->npins; i++) {
305 struct pin_desc *desc;
306
307 pin = pctldev->desc->pins[i].number;
308 desc = pin_desc_get(pctldev, pin);
309
310 if (desc == NULL)
311 continue;
312
313 seq_printf(s, "pin %d (%s): ", pin, desc->name);
314
315 pinconf_dump_pin(pctldev, s, pin);
316
317 seq_printf(s, "\n");
318 }
319
320 mutex_unlock(&pctldev->mutex);
321
322 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
331
332 pinconf_generic_dump_pins(pctldev, s, gname, 0);
333 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;
341 unsigned ngroups = pctlops->get_groups_count(pctldev);
342 unsigned selector = 0;
343
344 seq_puts(s, "Pin config settings per pin group\n");
345 seq_puts(s, "Format: group (name): configs\n");
346
347 while (selector < ngroups) {
348 const char *gname = pctlops->get_group_name(pctldev, selector);
349
350 seq_printf(s, "%u (%s): ", selector, gname);
351 pinconf_dump_group(pctldev, s, selector, gname);
352 seq_printf(s, "\n");
353
354 selector++;
355 }
356
357 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
384#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
395
396
397static struct dbg_cfg pinconf_dbg_conf;
398
399
400
401
402
403
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;
409 const struct pinctrl_map *found = NULL;
410 struct pinctrl_dev *pctldev;
411 struct dbg_cfg *dbg = &pinconf_dbg_conf;
412 int i;
413
414 mutex_lock(&pinctrl_maps_mutex);
415
416
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
425 if (!strcmp(map->data.configs.group_or_pin, dbg->pin_name)) {
426
427 found = map;
428 break;
429 }
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
442 pctldev = get_pinctrl_dev_from_devname(found->ctrl_dev_name);
443 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);
447
448exit:
449 mutex_unlock(&pinctrl_maps_mutex);
450
451 return 0;
452}
453
454
455
456
457
458
459
460
461
462
463
464
465
466static ssize_t pinconf_dbg_config_write(struct file *file,
467 const char __user *user_buf, size_t count, loff_t *ppos)
468{
469 struct pinctrl_maps *maps_node;
470 const struct pinctrl_map *map;
471 const struct pinctrl_map *found = NULL;
472 struct pinctrl_dev *pctldev;
473 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];
477 char buf[128];
478 char *b = &buf[0];
479 int buf_size;
480 char *token;
481 int i;
482
483
484 buf_size = min(count, sizeof(buf) - 1);
485 if (copy_from_user(buf, user_buf, buf_size))
486 return -EFAULT;
487 buf[buf_size] = 0;
488
489
490
491
492
493
494
495 token = strsep(&b, " ");
496 if (!token)
497 return -EINVAL;
498 if (strcmp(token, "modify"))
499 return -EINVAL;
500
501
502
503
504
505 token = strsep(&b, " ");
506 if (!token)
507 return -EINVAL;
508 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
513 return -EINVAL;
514
515
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
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
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
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
547 mutex_lock(&pinctrl_maps_mutex);
548
549
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
559 if (!strcmp(map->data.configs.group_or_pin, dbg->pin_name)) {
560 found = map;
561 break;
562 }
563 }
564
565 if (!found) {
566 count = -EINVAL;
567 goto exit;
568 }
569
570 pctldev = get_pinctrl_dev_from_devname(found->ctrl_dev_name);
571 if (pctldev)
572 confops = pctldev->desc->confops;
573
574 if (confops && confops->pin_config_dbg_parse_modify) {
575 configs = &found->data.configs;
576 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:
584 mutex_unlock(&pinctrl_maps_mutex);
585
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
603void 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);
610 debugfs_create_file("pinconf-config", (S_IRUGO | S_IWUSR | S_IWGRP),
611 devroot, pctldev, &pinconf_dbg_pinconfig_fops);
612}
613
614#endif
615
