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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 <[email protected]>
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 selector = 0;
352 unsigned int ngroups;
353
354 if (!pctlops->get_groups_count || !pctlops->get_group_name)
355 return 0;
356
357 ngroups = pctlops->get_groups_count(pctldev);
358
359 seq_puts(s, "Pin config settings per pin group\n");
360 seq_puts(s, "Format: group (name): configs\n");
361
362 while (selector < ngroups) {
363 const char *gname = pctlops->get_group_name(pctldev, selector);
364
365 seq_printf(s, "%u (%s): ", selector, gname);
366 pinconf_dump_group(pctldev, s, selector, gname);
367 seq_putc(s, '\n');
368 selector++;
369 }
370
371 return 0;
372}
373
374DEFINE_SHOW_ATTRIBUTE(pinconf_pins);
375DEFINE_SHOW_ATTRIBUTE(pinconf_groups);
376
377void pinconf_init_device_debugfs(struct dentry *devroot,
378 struct pinctrl_dev *pctldev)
379{
380 debugfs_create_file("pinconf-pins", 0444,
381 devroot, pctldev, &pinconf_pins_fops);
382 debugfs_create_file("pinconf-groups", 0444,
383 devroot, pctldev, &pinconf_groups_fops);
384}
385
386#endif