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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>
20#include <linux/pinctrl/machine.h>
21#include <linux/pinctrl/pinctrl.h>
22#include <linux/pinctrl/pinconf.h>
23#include "core.h"
24#include "pinconf.h"
25
26int pin_config_get_for_pin(struct pinctrl_dev *pctldev, unsigned pin,
27 unsigned long *config)
28{
29 const struct pinconf_ops *ops = pctldev->desc->confops;
30
31 if (!ops || !ops->pin_config_get) {
Stephen Warren51cd24e2011-12-09 16:59:05 -070032 dev_err(pctldev->dev, "cannot get pin configuration, missing "
Linus Walleijae6b4d82011-10-19 18:14:33 +020033 "pin_config_get() function in driver\n");
34 return -EINVAL;
35 }
36
37 return ops->pin_config_get(pctldev, pin, config);
38}
39
40/**
41 * pin_config_get() - get the configuration of a single pin parameter
Stephen Warren43699de2011-12-15 16:57:17 -070042 * @dev_name: name of the pin controller device for this pin
Linus Walleijae6b4d82011-10-19 18:14:33 +020043 * @name: name of the pin to get the config for
44 * @config: the config pointed to by this argument will be filled in with the
45 * current pin state, it can be used directly by drivers as a numeral, or
46 * it can be dereferenced to any struct.
47 */
Stephen Warren43699de2011-12-15 16:57:17 -070048int pin_config_get(const char *dev_name, const char *name,
Linus Walleijae6b4d82011-10-19 18:14:33 +020049 unsigned long *config)
50{
Stephen Warren43699de2011-12-15 16:57:17 -070051 struct pinctrl_dev *pctldev;
Linus Walleijae6b4d82011-10-19 18:14:33 +020052 int pin;
53
Stephen Warren43699de2011-12-15 16:57:17 -070054 pctldev = get_pinctrl_dev_from_dev(NULL, dev_name);
55 if (!pctldev)
56 return -EINVAL;
57
Linus Walleijae6b4d82011-10-19 18:14:33 +020058 pin = pin_get_from_name(pctldev, name);
59 if (pin < 0)
60 return pin;
61
62 return pin_config_get_for_pin(pctldev, pin, config);
63}
64EXPORT_SYMBOL(pin_config_get);
65
66int pin_config_set_for_pin(struct pinctrl_dev *pctldev, unsigned pin,
67 unsigned long config)
68{
69 const struct pinconf_ops *ops = pctldev->desc->confops;
70 int ret;
71
72 if (!ops || !ops->pin_config_set) {
Stephen Warren51cd24e2011-12-09 16:59:05 -070073 dev_err(pctldev->dev, "cannot configure pin, missing "
Linus Walleijae6b4d82011-10-19 18:14:33 +020074 "config function in driver\n");
75 return -EINVAL;
76 }
77
78 ret = ops->pin_config_set(pctldev, pin, config);
79 if (ret) {
Stephen Warren51cd24e2011-12-09 16:59:05 -070080 dev_err(pctldev->dev,
Linus Walleijae6b4d82011-10-19 18:14:33 +020081 "unable to set pin configuration on pin %d\n", pin);
82 return ret;
83 }
84
85 return 0;
86}
87
88/**
89 * pin_config_set() - set the configuration of a single pin parameter
Stephen Warren43699de2011-12-15 16:57:17 -070090 * @dev_name: name of pin controller device for this pin
Linus Walleijae6b4d82011-10-19 18:14:33 +020091 * @name: name of the pin to set the config for
92 * @config: the config in this argument will contain the desired pin state, it
93 * can be used directly by drivers as a numeral, or it can be dereferenced
94 * to any struct.
95 */
Stephen Warren43699de2011-12-15 16:57:17 -070096int pin_config_set(const char *dev_name, const char *name,
Linus Walleijae6b4d82011-10-19 18:14:33 +020097 unsigned long config)
98{
Stephen Warren43699de2011-12-15 16:57:17 -070099 struct pinctrl_dev *pctldev;
Linus Walleijae6b4d82011-10-19 18:14:33 +0200100 int pin;
101
Stephen Warren43699de2011-12-15 16:57:17 -0700102 pctldev = get_pinctrl_dev_from_dev(NULL, dev_name);
103 if (!pctldev)
104 return -EINVAL;
105
Linus Walleijae6b4d82011-10-19 18:14:33 +0200106 pin = pin_get_from_name(pctldev, name);
107 if (pin < 0)
108 return pin;
109
110 return pin_config_set_for_pin(pctldev, pin, config);
111}
112EXPORT_SYMBOL(pin_config_set);
113
Stephen Warren43699de2011-12-15 16:57:17 -0700114int pin_config_group_get(const char *dev_name, const char *pin_group,
Linus Walleijae6b4d82011-10-19 18:14:33 +0200115 unsigned long *config)
116{
Stephen Warren43699de2011-12-15 16:57:17 -0700117 struct pinctrl_dev *pctldev;
118 const struct pinconf_ops *ops;
Linus Walleijae6b4d82011-10-19 18:14:33 +0200119 int selector;
120
Stephen Warren43699de2011-12-15 16:57:17 -0700121 pctldev = get_pinctrl_dev_from_dev(NULL, dev_name);
122 if (!pctldev)
123 return -EINVAL;
124 ops = pctldev->desc->confops;
125
Linus Walleijae6b4d82011-10-19 18:14:33 +0200126 if (!ops || !ops->pin_config_group_get) {
Stephen Warren51cd24e2011-12-09 16:59:05 -0700127 dev_err(pctldev->dev, "cannot get configuration for pin "
Linus Walleijae6b4d82011-10-19 18:14:33 +0200128 "group, missing group config get function in "
129 "driver\n");
130 return -EINVAL;
131 }
132
133 selector = pinctrl_get_group_selector(pctldev, pin_group);
134 if (selector < 0)
135 return selector;
136
137 return ops->pin_config_group_get(pctldev, selector, config);
138}
139EXPORT_SYMBOL(pin_config_group_get);
140
141
Stephen Warren43699de2011-12-15 16:57:17 -0700142int pin_config_group_set(const char *dev_name, const char *pin_group,
Linus Walleijae6b4d82011-10-19 18:14:33 +0200143 unsigned long config)
144{
Stephen Warren43699de2011-12-15 16:57:17 -0700145 struct pinctrl_dev *pctldev;
146 const struct pinconf_ops *ops;
147 const struct pinctrl_ops *pctlops;
Linus Walleijae6b4d82011-10-19 18:14:33 +0200148 int selector;
149 const unsigned *pins;
150 unsigned num_pins;
151 int ret;
152 int i;
153
Stephen Warren43699de2011-12-15 16:57:17 -0700154 pctldev = get_pinctrl_dev_from_dev(NULL, dev_name);
155 if (!pctldev)
156 return -EINVAL;
157 ops = pctldev->desc->confops;
158 pctlops = pctldev->desc->pctlops;
159
Linus Walleijae6b4d82011-10-19 18:14:33 +0200160 if (!ops || (!ops->pin_config_group_set && !ops->pin_config_set)) {
Stephen Warren51cd24e2011-12-09 16:59:05 -0700161 dev_err(pctldev->dev, "cannot configure pin group, missing "
Linus Walleijae6b4d82011-10-19 18:14:33 +0200162 "config function in driver\n");
163 return -EINVAL;
164 }
165
166 selector = pinctrl_get_group_selector(pctldev, pin_group);
167 if (selector < 0)
168 return selector;
169
170 ret = pctlops->get_group_pins(pctldev, selector, &pins, &num_pins);
171 if (ret) {
Stephen Warren51cd24e2011-12-09 16:59:05 -0700172 dev_err(pctldev->dev, "cannot configure pin group, error "
Linus Walleijae6b4d82011-10-19 18:14:33 +0200173 "getting pins\n");
174 return ret;
175 }
176
177 /*
178 * If the pin controller supports handling entire groups we use that
179 * capability.
180 */
181 if (ops->pin_config_group_set) {
182 ret = ops->pin_config_group_set(pctldev, selector, config);
183 /*
184 * If the pin controller prefer that a certain group be handled
185 * pin-by-pin as well, it returns -EAGAIN.
186 */
187 if (ret != -EAGAIN)
188 return ret;
189 }
190
191 /*
192 * If the controller cannot handle entire groups, we configure each pin
193 * individually.
194 */
195 if (!ops->pin_config_set)
196 return 0;
197
198 for (i = 0; i < num_pins; i++) {
199 ret = ops->pin_config_set(pctldev, pins[i], config);
200 if (ret < 0)
201 return ret;
202 }
203
204 return 0;
205}
206EXPORT_SYMBOL(pin_config_group_set);
207
208int pinconf_check_ops(const struct pinconf_ops *ops)
209{
210 /* We must be able to read out pin status */
211 if (!ops->pin_config_get && !ops->pin_config_group_get)
212 return -EINVAL;
213 /* We have to be able to config the pins in SOME way */
214 if (!ops->pin_config_set && !ops->pin_config_group_set)
215 return -EINVAL;
216 return 0;
217}
218
219#ifdef CONFIG_DEBUG_FS
220
221static void pinconf_dump_pin(struct pinctrl_dev *pctldev,
222 struct seq_file *s, int pin)
223{
224 const struct pinconf_ops *ops = pctldev->desc->confops;
225
226 if (ops && ops->pin_config_dbg_show)
227 ops->pin_config_dbg_show(pctldev, s, pin);
228}
229
230static int pinconf_pins_show(struct seq_file *s, void *what)
231{
232 struct pinctrl_dev *pctldev = s->private;
Chanho Park706e8522012-01-03 16:47:50 +0900233 unsigned i, pin;
Linus Walleijae6b4d82011-10-19 18:14:33 +0200234
235 seq_puts(s, "Pin config settings per pin\n");
236 seq_puts(s, "Format: pin (name): pinmux setting array\n");
237
Chanho Park706e8522012-01-03 16:47:50 +0900238 /* The pin number can be retrived from the pin controller descriptor */
239 for (i = 0; pin < pctldev->desc->npins; i++) {
Linus Walleijae6b4d82011-10-19 18:14:33 +0200240 struct pin_desc *desc;
241
Chanho Park706e8522012-01-03 16:47:50 +0900242 pin = pctldev->desc->pins[i].number;
Linus Walleijae6b4d82011-10-19 18:14:33 +0200243 desc = pin_desc_get(pctldev, pin);
Chanho Park706e8522012-01-03 16:47:50 +0900244 /* Skip if we cannot search the pin */
Linus Walleijae6b4d82011-10-19 18:14:33 +0200245 if (desc == NULL)
246 continue;
247
248 seq_printf(s, "pin %d (%s):", pin,
249 desc->name ? desc->name : "unnamed");
250
251 pinconf_dump_pin(pctldev, s, pin);
252
253 seq_printf(s, "\n");
254 }
255
256 return 0;
257}
258
259static void pinconf_dump_group(struct pinctrl_dev *pctldev,
260 struct seq_file *s, unsigned selector,
261 const char *gname)
262{
263 const struct pinconf_ops *ops = pctldev->desc->confops;
264
265 if (ops && ops->pin_config_group_dbg_show)
266 ops->pin_config_group_dbg_show(pctldev, s, selector);
267}
268
269static int pinconf_groups_show(struct seq_file *s, void *what)
270{
271 struct pinctrl_dev *pctldev = s->private;
272 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
273 const struct pinconf_ops *ops = pctldev->desc->confops;
274 unsigned selector = 0;
275
276 if (!ops || !ops->pin_config_group_get)
277 return 0;
278
279 seq_puts(s, "Pin config settings per pin group\n");
280 seq_puts(s, "Format: group (name): pinmux setting array\n");
281
282 while (pctlops->list_groups(pctldev, selector) >= 0) {
283 const char *gname = pctlops->get_group_name(pctldev, selector);
284
285 seq_printf(s, "%u (%s):", selector, gname);
286 pinconf_dump_group(pctldev, s, selector, gname);
287 selector++;
288 }
289
290 return 0;
291}
292
293static int pinconf_pins_open(struct inode *inode, struct file *file)
294{
295 return single_open(file, pinconf_pins_show, inode->i_private);
296}
297
298static int pinconf_groups_open(struct inode *inode, struct file *file)
299{
300 return single_open(file, pinconf_groups_show, inode->i_private);
301}
302
303static const struct file_operations pinconf_pins_ops = {
304 .open = pinconf_pins_open,
305 .read = seq_read,
306 .llseek = seq_lseek,
307 .release = single_release,
308};
309
310static const struct file_operations pinconf_groups_ops = {
311 .open = pinconf_groups_open,
312 .read = seq_read,
313 .llseek = seq_lseek,
314 .release = single_release,
315};
316
317void pinconf_init_device_debugfs(struct dentry *devroot,
318 struct pinctrl_dev *pctldev)
319{
320 debugfs_create_file("pinconf-pins", S_IFREG | S_IRUGO,
321 devroot, pctldev, &pinconf_pins_ops);
322 debugfs_create_file("pinconf-groups", S_IFREG | S_IRUGO,
323 devroot, pctldev, &pinconf_groups_ops);
324}
325
326#endif