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af873fce | 1 | // SPDX-License-Identifier: GPL-2.0-only |
ae6b4d85 LW |
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> | |
ae6b4d85 LW |
9 | */ |
10 | #define pr_fmt(fmt) "pinconfig core: " fmt | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/device.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/debugfs.h> | |
18 | #include <linux/seq_file.h> | |
19 | #include <linux/pinctrl/machine.h> | |
20 | #include <linux/pinctrl/pinctrl.h> | |
21 | #include <linux/pinctrl/pinconf.h> | |
22 | #include "core.h" | |
23 | #include "pinconf.h" | |
24 | ||
2b694250 SW |
25 | int pinconf_check_ops(struct pinctrl_dev *pctldev) |
26 | { | |
27 | const struct pinconf_ops *ops = pctldev->desc->confops; | |
28 | ||
2b694250 | 29 | /* We have to be able to config the pins in SOME way */ |
ad6e1107 JC |
30 | if (!ops->pin_config_set && !ops->pin_config_group_set) { |
31 | dev_err(pctldev->dev, | |
32 | "pinconf has to be able to set a pins config\n"); | |
2b694250 | 33 | return -EINVAL; |
ad6e1107 | 34 | } |
2b694250 SW |
35 | return 0; |
36 | } | |
37 | ||
3f713b7c | 38 | int pinconf_validate_map(const struct pinctrl_map *map, int i) |
1e2082b5 SW |
39 | { |
40 | if (!map->data.configs.group_or_pin) { | |
41 | pr_err("failed to register map %s (%d): no group/pin given\n", | |
42 | map->name, i); | |
43 | return -EINVAL; | |
44 | } | |
45 | ||
c95df2db | 46 | if (!map->data.configs.num_configs || |
1e2082b5 | 47 | !map->data.configs.configs) { |
c95df2db | 48 | pr_err("failed to register map %s (%d): no configs given\n", |
1e2082b5 SW |
49 | map->name, i); |
50 | return -EINVAL; | |
51 | } | |
52 | ||
53 | return 0; | |
54 | } | |
55 | ||
394349f7 | 56 | int pin_config_get_for_pin(struct pinctrl_dev *pctldev, unsigned pin, |
ae6b4d85 LW |
57 | unsigned long *config) |
58 | { | |
59 | const struct pinconf_ops *ops = pctldev->desc->confops; | |
60 | ||
61 | if (!ops || !ops->pin_config_get) { | |
ca67f10f MY |
62 | dev_dbg(pctldev->dev, |
63 | "cannot get pin configuration, .pin_config_get missing in driver\n"); | |
c420619d | 64 | return -ENOTSUPP; |
ae6b4d85 LW |
65 | } |
66 | ||
67 | return ops->pin_config_get(pctldev, pin, config); | |
68 | } | |
69 | ||
43699dea | 70 | int pin_config_group_get(const char *dev_name, const char *pin_group, |
ae6b4d85 LW |
71 | unsigned long *config) |
72 | { | |
43699dea SW |
73 | struct pinctrl_dev *pctldev; |
74 | const struct pinconf_ops *ops; | |
57b676f9 SW |
75 | int selector, ret; |
76 | ||
9dfac4fd | 77 | pctldev = get_pinctrl_dev_from_devname(dev_name); |
57b676f9 SW |
78 | if (!pctldev) { |
79 | ret = -EINVAL; | |
42fed7ba | 80 | return ret; |
57b676f9 | 81 | } |
42fed7ba PC |
82 | |
83 | mutex_lock(&pctldev->mutex); | |
84 | ||
43699dea SW |
85 | ops = pctldev->desc->confops; |
86 | ||
ae6b4d85 | 87 | if (!ops || !ops->pin_config_group_get) { |
e4d03050 ME |
88 | dev_dbg(pctldev->dev, |
89 | "cannot get configuration for pin group, missing group config get function in driver\n"); | |
c420619d | 90 | ret = -ENOTSUPP; |
57b676f9 | 91 | goto unlock; |
ae6b4d85 LW |
92 | } |
93 | ||
94 | selector = pinctrl_get_group_selector(pctldev, pin_group); | |
57b676f9 SW |
95 | if (selector < 0) { |
96 | ret = selector; | |
97 | goto unlock; | |
98 | } | |
ae6b4d85 | 99 | |
57b676f9 SW |
100 | ret = ops->pin_config_group_get(pctldev, selector, config); |
101 | ||
102 | unlock: | |
42fed7ba | 103 | mutex_unlock(&pctldev->mutex); |
57b676f9 | 104 | return ret; |
ae6b4d85 | 105 | } |
ae6b4d85 | 106 | |
3f713b7c | 107 | int pinconf_map_to_setting(const struct pinctrl_map *map, |
1e2082b5 SW |
108 | struct pinctrl_setting *setting) |
109 | { | |
110 | struct pinctrl_dev *pctldev = setting->pctldev; | |
70b36378 | 111 | int pin; |
1e2082b5 SW |
112 | |
113 | switch (setting->type) { | |
114 | case PIN_MAP_TYPE_CONFIGS_PIN: | |
70b36378 LW |
115 | pin = pin_get_from_name(pctldev, |
116 | map->data.configs.group_or_pin); | |
117 | if (pin < 0) { | |
118 | dev_err(pctldev->dev, "could not map pin config for \"%s\"", | |
119 | map->data.configs.group_or_pin); | |
120 | return pin; | |
121 | } | |
122 | setting->data.configs.group_or_pin = pin; | |
1e2082b5 SW |
123 | break; |
124 | case PIN_MAP_TYPE_CONFIGS_GROUP: | |
70b36378 LW |
125 | pin = pinctrl_get_group_selector(pctldev, |
126 | map->data.configs.group_or_pin); | |
127 | if (pin < 0) { | |
128 | dev_err(pctldev->dev, "could not map group config for \"%s\"", | |
129 | map->data.configs.group_or_pin); | |
130 | return pin; | |
131 | } | |
132 | setting->data.configs.group_or_pin = pin; | |
1e2082b5 SW |
133 | break; |
134 | default: | |
135 | return -EINVAL; | |
136 | } | |
137 | ||
138 | setting->data.configs.num_configs = map->data.configs.num_configs; | |
139 | setting->data.configs.configs = map->data.configs.configs; | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
3f713b7c | 144 | void pinconf_free_setting(const struct pinctrl_setting *setting) |
1e2082b5 SW |
145 | { |
146 | } | |
147 | ||
3f713b7c | 148 | int pinconf_apply_setting(const struct pinctrl_setting *setting) |
1e2082b5 SW |
149 | { |
150 | struct pinctrl_dev *pctldev = setting->pctldev; | |
151 | const struct pinconf_ops *ops = pctldev->desc->confops; | |
03b054e9 | 152 | int ret; |
1e2082b5 SW |
153 | |
154 | if (!ops) { | |
155 | dev_err(pctldev->dev, "missing confops\n"); | |
156 | return -EINVAL; | |
157 | } | |
158 | ||
159 | switch (setting->type) { | |
160 | case PIN_MAP_TYPE_CONFIGS_PIN: | |
161 | if (!ops->pin_config_set) { | |
162 | dev_err(pctldev->dev, "missing pin_config_set op\n"); | |
163 | return -EINVAL; | |
164 | } | |
03b054e9 SY |
165 | ret = ops->pin_config_set(pctldev, |
166 | setting->data.configs.group_or_pin, | |
167 | setting->data.configs.configs, | |
168 | setting->data.configs.num_configs); | |
169 | if (ret < 0) { | |
170 | dev_err(pctldev->dev, | |
171 | "pin_config_set op failed for pin %d\n", | |
172 | setting->data.configs.group_or_pin); | |
173 | return ret; | |
1e2082b5 SW |
174 | } |
175 | break; | |
176 | case PIN_MAP_TYPE_CONFIGS_GROUP: | |
177 | if (!ops->pin_config_group_set) { | |
178 | dev_err(pctldev->dev, | |
179 | "missing pin_config_group_set op\n"); | |
180 | return -EINVAL; | |
181 | } | |
03b054e9 SY |
182 | ret = ops->pin_config_group_set(pctldev, |
183 | setting->data.configs.group_or_pin, | |
184 | setting->data.configs.configs, | |
185 | setting->data.configs.num_configs); | |
186 | if (ret < 0) { | |
187 | dev_err(pctldev->dev, | |
188 | "pin_config_group_set op failed for group %d\n", | |
189 | setting->data.configs.group_or_pin); | |
190 | return ret; | |
1e2082b5 SW |
191 | } |
192 | break; | |
193 | default: | |
194 | return -EINVAL; | |
195 | } | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
15381bc7 MW |
200 | int pinconf_set_config(struct pinctrl_dev *pctldev, unsigned pin, |
201 | unsigned long *configs, size_t nconfigs) | |
202 | { | |
203 | const struct pinconf_ops *ops; | |
204 | ||
205 | ops = pctldev->desc->confops; | |
17a51248 | 206 | if (!ops || !ops->pin_config_set) |
15381bc7 MW |
207 | return -ENOTSUPP; |
208 | ||
209 | return ops->pin_config_set(pctldev, pin, configs, nconfigs); | |
210 | } | |
211 | ||
ae6b4d85 LW |
212 | #ifdef CONFIG_DEBUG_FS |
213 | ||
6de52c15 | 214 | static void pinconf_show_config(struct seq_file *s, struct pinctrl_dev *pctldev, |
d96310ae | 215 | unsigned long *configs, unsigned num_configs) |
1e2082b5 | 216 | { |
6cb41587 | 217 | const struct pinconf_ops *confops; |
1e2082b5 SW |
218 | int i; |
219 | ||
6cb41587 SW |
220 | if (pctldev) |
221 | confops = pctldev->desc->confops; | |
222 | else | |
223 | confops = NULL; | |
224 | ||
d96310ae JH |
225 | for (i = 0; i < num_configs; i++) { |
226 | seq_puts(s, "config "); | |
227 | if (confops && confops->pin_config_config_dbg_show) | |
228 | confops->pin_config_config_dbg_show(pctldev, s, | |
229 | configs[i]); | |
230 | else | |
231 | seq_printf(s, "%08lx", configs[i]); | |
47352a63 | 232 | seq_putc(s, '\n'); |
d96310ae JH |
233 | } |
234 | } | |
235 | ||
3f713b7c | 236 | void pinconf_show_map(struct seq_file *s, const struct pinctrl_map *map) |
d96310ae JH |
237 | { |
238 | struct pinctrl_dev *pctldev; | |
239 | ||
240 | pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name); | |
241 | ||
1e2082b5 SW |
242 | switch (map->type) { |
243 | case PIN_MAP_TYPE_CONFIGS_PIN: | |
de2eae26 | 244 | seq_puts(s, "pin "); |
1e2082b5 SW |
245 | break; |
246 | case PIN_MAP_TYPE_CONFIGS_GROUP: | |
de2eae26 | 247 | seq_puts(s, "group "); |
1e2082b5 SW |
248 | break; |
249 | default: | |
250 | break; | |
251 | } | |
252 | ||
253 | seq_printf(s, "%s\n", map->data.configs.group_or_pin); | |
254 | ||
d96310ae JH |
255 | pinconf_show_config(s, pctldev, map->data.configs.configs, |
256 | map->data.configs.num_configs); | |
1e2082b5 SW |
257 | } |
258 | ||
259 | void pinconf_show_setting(struct seq_file *s, | |
3f713b7c | 260 | const struct pinctrl_setting *setting) |
1e2082b5 SW |
261 | { |
262 | struct pinctrl_dev *pctldev = setting->pctldev; | |
263 | const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; | |
264 | struct pin_desc *desc; | |
1e2082b5 SW |
265 | |
266 | switch (setting->type) { | |
267 | case PIN_MAP_TYPE_CONFIGS_PIN: | |
268 | desc = pin_desc_get(setting->pctldev, | |
269 | setting->data.configs.group_or_pin); | |
cf9d994d | 270 | seq_printf(s, "pin %s (%d)", desc->name, |
1e2082b5 SW |
271 | setting->data.configs.group_or_pin); |
272 | break; | |
273 | case PIN_MAP_TYPE_CONFIGS_GROUP: | |
274 | seq_printf(s, "group %s (%d)", | |
275 | pctlops->get_group_name(pctldev, | |
276 | setting->data.configs.group_or_pin), | |
277 | setting->data.configs.group_or_pin); | |
278 | break; | |
279 | default: | |
280 | break; | |
281 | } | |
282 | ||
283 | /* | |
3ec440e3 | 284 | * FIXME: We should really get the pin controller to dump the config |
1e2082b5 SW |
285 | * values, so they can be decoded to something meaningful. |
286 | */ | |
d96310ae JH |
287 | pinconf_show_config(s, pctldev, setting->data.configs.configs, |
288 | setting->data.configs.num_configs); | |
1e2082b5 SW |
289 | } |
290 | ||
ae6b4d85 LW |
291 | static void pinconf_dump_pin(struct pinctrl_dev *pctldev, |
292 | struct seq_file *s, int pin) | |
293 | { | |
294 | const struct pinconf_ops *ops = pctldev->desc->confops; | |
295 | ||
394349f7 | 296 | /* no-op when not using generic pin config */ |
dd4d01f7 | 297 | pinconf_generic_dump_pins(pctldev, s, NULL, pin); |
ae6b4d85 LW |
298 | if (ops && ops->pin_config_dbg_show) |
299 | ops->pin_config_dbg_show(pctldev, s, pin); | |
300 | } | |
301 | ||
302 | static int pinconf_pins_show(struct seq_file *s, void *what) | |
303 | { | |
304 | struct pinctrl_dev *pctldev = s->private; | |
706e8520 | 305 | unsigned i, pin; |
ae6b4d85 LW |
306 | |
307 | seq_puts(s, "Pin config settings per pin\n"); | |
2aeefe02 | 308 | seq_puts(s, "Format: pin (name): configs\n"); |
ae6b4d85 | 309 | |
42fed7ba | 310 | mutex_lock(&pctldev->mutex); |
57b676f9 | 311 | |
706e8520 | 312 | /* The pin number can be retrived from the pin controller descriptor */ |
546edd83 | 313 | for (i = 0; i < pctldev->desc->npins; i++) { |
ae6b4d85 LW |
314 | struct pin_desc *desc; |
315 | ||
706e8520 | 316 | pin = pctldev->desc->pins[i].number; |
ae6b4d85 | 317 | desc = pin_desc_get(pctldev, pin); |
706e8520 | 318 | /* Skip if we cannot search the pin */ |
76ce37f0 | 319 | if (!desc) |
ae6b4d85 LW |
320 | continue; |
321 | ||
a672eb5e | 322 | seq_printf(s, "pin %d (%s): ", pin, desc->name); |
ae6b4d85 LW |
323 | |
324 | pinconf_dump_pin(pctldev, s, pin); | |
47352a63 | 325 | seq_putc(s, '\n'); |
ae6b4d85 LW |
326 | } |
327 | ||
42fed7ba | 328 | mutex_unlock(&pctldev->mutex); |
57b676f9 | 329 | |
ae6b4d85 LW |
330 | return 0; |
331 | } | |
332 | ||
333 | static void pinconf_dump_group(struct pinctrl_dev *pctldev, | |
334 | struct seq_file *s, unsigned selector, | |
335 | const char *gname) | |
336 | { | |
337 | const struct pinconf_ops *ops = pctldev->desc->confops; | |
338 | ||
394349f7 | 339 | /* no-op when not using generic pin config */ |
dd4d01f7 | 340 | pinconf_generic_dump_pins(pctldev, s, gname, 0); |
ae6b4d85 LW |
341 | if (ops && ops->pin_config_group_dbg_show) |
342 | ops->pin_config_group_dbg_show(pctldev, s, selector); | |
343 | } | |
344 | ||
345 | static int pinconf_groups_show(struct seq_file *s, void *what) | |
346 | { | |
347 | struct pinctrl_dev *pctldev = s->private; | |
348 | const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; | |
d1e90e9e | 349 | unsigned ngroups = pctlops->get_groups_count(pctldev); |
ae6b4d85 LW |
350 | unsigned selector = 0; |
351 | ||
ae6b4d85 | 352 | seq_puts(s, "Pin config settings per pin group\n"); |
2aeefe02 | 353 | seq_puts(s, "Format: group (name): configs\n"); |
ae6b4d85 | 354 | |
d1e90e9e | 355 | while (selector < ngroups) { |
ae6b4d85 LW |
356 | const char *gname = pctlops->get_group_name(pctldev, selector); |
357 | ||
a672eb5e | 358 | seq_printf(s, "%u (%s): ", selector, gname); |
ae6b4d85 | 359 | pinconf_dump_group(pctldev, s, selector, gname); |
47352a63 | 360 | seq_putc(s, '\n'); |
ae6b4d85 LW |
361 | selector++; |
362 | } | |
363 | ||
364 | return 0; | |
365 | } | |
366 | ||
0819dc72 YL |
367 | DEFINE_SHOW_ATTRIBUTE(pinconf_pins); |
368 | DEFINE_SHOW_ATTRIBUTE(pinconf_groups); | |
ae6b4d85 LW |
369 | |
370 | void pinconf_init_device_debugfs(struct dentry *devroot, | |
371 | struct pinctrl_dev *pctldev) | |
372 | { | |
47473813 | 373 | debugfs_create_file("pinconf-pins", 0444, |
0819dc72 | 374 | devroot, pctldev, &pinconf_pins_fops); |
47473813 | 375 | debugfs_create_file("pinconf-groups", 0444, |
0819dc72 | 376 | devroot, pctldev, &pinconf_groups_fops); |
ae6b4d85 LW |
377 | } |
378 | ||
379 | #endif |