2 * Core driver for the pin config portions of the pin control subsystem
4 * Copyright (C) 2011 ST-Ericsson SA
5 * Written on behalf of Linaro for ST-Ericsson
7 * Author: Linus Walleij <linus.walleij@linaro.org>
9 * License terms: GNU General Public License (GPL) version 2
11 #define pr_fmt(fmt) "pinconfig core: " fmt
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>
26 int pinconf_check_ops(struct pinctrl_dev *pctldev)
28 const struct pinconf_ops *ops = pctldev->desc->confops;
30 /* We must be able to read out pin status */
31 if (!ops->pin_config_get && !ops->pin_config_group_get)
33 /* We have to be able to config the pins in SOME way */
34 if (!ops->pin_config_set && !ops->pin_config_group_set)
39 static int pin_config_get_for_pin(struct pinctrl_dev *pctldev, unsigned pin,
40 unsigned long *config)
42 const struct pinconf_ops *ops = pctldev->desc->confops;
44 if (!ops || !ops->pin_config_get) {
45 dev_err(pctldev->dev, "cannot get pin configuration, missing "
46 "pin_config_get() function in driver\n");
50 return ops->pin_config_get(pctldev, pin, config);
54 * pin_config_get() - get the configuration of a single pin parameter
55 * @dev_name: name of the pin controller device for this pin
56 * @name: name of the pin to get the config for
57 * @config: the config pointed to by this argument will be filled in with the
58 * current pin state, it can be used directly by drivers as a numeral, or
59 * it can be dereferenced to any struct.
61 int pin_config_get(const char *dev_name, const char *name,
62 unsigned long *config)
64 struct pinctrl_dev *pctldev;
67 mutex_lock(&pinctrl_mutex);
69 pctldev = get_pinctrl_dev_from_devname(dev_name);
75 pin = pin_get_from_name(pctldev, name);
79 pin = pin_config_get_for_pin(pctldev, pin, config);
82 mutex_unlock(&pinctrl_mutex);
85 EXPORT_SYMBOL(pin_config_get);
87 static int pin_config_set_for_pin(struct pinctrl_dev *pctldev, unsigned pin,
90 const struct pinconf_ops *ops = pctldev->desc->confops;
93 if (!ops || !ops->pin_config_set) {
94 dev_err(pctldev->dev, "cannot configure pin, missing "
95 "config function in driver\n");
99 ret = ops->pin_config_set(pctldev, pin, config);
101 dev_err(pctldev->dev,
102 "unable to set pin configuration on pin %d\n", pin);
110 * pin_config_set() - set the configuration of a single pin parameter
111 * @dev_name: name of pin controller device for this pin
112 * @name: name of the pin to set the config for
113 * @config: the config in this argument will contain the desired pin state, it
114 * can be used directly by drivers as a numeral, or it can be dereferenced
117 int pin_config_set(const char *dev_name, const char *name,
118 unsigned long config)
120 struct pinctrl_dev *pctldev;
123 mutex_lock(&pinctrl_mutex);
125 pctldev = get_pinctrl_dev_from_devname(dev_name);
131 pin = pin_get_from_name(pctldev, name);
137 ret = pin_config_set_for_pin(pctldev, pin, config);
140 mutex_unlock(&pinctrl_mutex);
143 EXPORT_SYMBOL(pin_config_set);
145 int pin_config_group_get(const char *dev_name, const char *pin_group,
146 unsigned long *config)
148 struct pinctrl_dev *pctldev;
149 const struct pinconf_ops *ops;
152 mutex_lock(&pinctrl_mutex);
154 pctldev = get_pinctrl_dev_from_devname(dev_name);
159 ops = pctldev->desc->confops;
161 if (!ops || !ops->pin_config_group_get) {
162 dev_err(pctldev->dev, "cannot get configuration for pin "
163 "group, missing group config get function in "
169 selector = pinctrl_get_group_selector(pctldev, pin_group);
175 ret = ops->pin_config_group_get(pctldev, selector, config);
178 mutex_unlock(&pinctrl_mutex);
181 EXPORT_SYMBOL(pin_config_group_get);
183 int pin_config_group_set(const char *dev_name, const char *pin_group,
184 unsigned long config)
186 struct pinctrl_dev *pctldev;
187 const struct pinconf_ops *ops;
188 const struct pinctrl_ops *pctlops;
190 const unsigned *pins;
195 mutex_lock(&pinctrl_mutex);
197 pctldev = get_pinctrl_dev_from_devname(dev_name);
202 ops = pctldev->desc->confops;
203 pctlops = pctldev->desc->pctlops;
205 if (!ops || (!ops->pin_config_group_set && !ops->pin_config_set)) {
206 dev_err(pctldev->dev, "cannot configure pin group, missing "
207 "config function in driver\n");
212 selector = pinctrl_get_group_selector(pctldev, pin_group);
218 ret = pctlops->get_group_pins(pctldev, selector, &pins, &num_pins);
220 dev_err(pctldev->dev, "cannot configure pin group, error "
226 * If the pin controller supports handling entire groups we use that
229 if (ops->pin_config_group_set) {
230 ret = ops->pin_config_group_set(pctldev, selector, config);
232 * If the pin controller prefer that a certain group be handled
233 * pin-by-pin as well, it returns -EAGAIN.
240 * If the controller cannot handle entire groups, we configure each pin
243 if (!ops->pin_config_set) {
248 for (i = 0; i < num_pins; i++) {
249 ret = ops->pin_config_set(pctldev, pins[i], config);
257 mutex_unlock(&pinctrl_mutex);
261 EXPORT_SYMBOL(pin_config_group_set);
263 #ifdef CONFIG_DEBUG_FS
265 static void pinconf_dump_pin(struct pinctrl_dev *pctldev,
266 struct seq_file *s, int pin)
268 const struct pinconf_ops *ops = pctldev->desc->confops;
270 if (ops && ops->pin_config_dbg_show)
271 ops->pin_config_dbg_show(pctldev, s, pin);
274 static int pinconf_pins_show(struct seq_file *s, void *what)
276 struct pinctrl_dev *pctldev = s->private;
279 seq_puts(s, "Pin config settings per pin\n");
280 seq_puts(s, "Format: pin (name): pinmux setting array\n");
282 mutex_lock(&pinctrl_mutex);
284 /* The pin number can be retrived from the pin controller descriptor */
285 for (i = 0; i < pctldev->desc->npins; i++) {
286 struct pin_desc *desc;
288 pin = pctldev->desc->pins[i].number;
289 desc = pin_desc_get(pctldev, pin);
290 /* Skip if we cannot search the pin */
294 seq_printf(s, "pin %d (%s):", pin,
295 desc->name ? desc->name : "unnamed");
297 pinconf_dump_pin(pctldev, s, pin);
302 mutex_unlock(&pinctrl_mutex);
307 static void pinconf_dump_group(struct pinctrl_dev *pctldev,
308 struct seq_file *s, unsigned selector,
311 const struct pinconf_ops *ops = pctldev->desc->confops;
313 if (ops && ops->pin_config_group_dbg_show)
314 ops->pin_config_group_dbg_show(pctldev, s, selector);
317 static int pinconf_groups_show(struct seq_file *s, void *what)
319 struct pinctrl_dev *pctldev = s->private;
320 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
321 const struct pinconf_ops *ops = pctldev->desc->confops;
322 unsigned selector = 0;
324 if (!ops || !ops->pin_config_group_get)
327 seq_puts(s, "Pin config settings per pin group\n");
328 seq_puts(s, "Format: group (name): pinmux setting array\n");
330 mutex_lock(&pinctrl_mutex);
332 while (pctlops->list_groups(pctldev, selector) >= 0) {
333 const char *gname = pctlops->get_group_name(pctldev, selector);
335 seq_printf(s, "%u (%s):", selector, gname);
336 pinconf_dump_group(pctldev, s, selector, gname);
342 mutex_unlock(&pinctrl_mutex);
347 static int pinconf_pins_open(struct inode *inode, struct file *file)
349 return single_open(file, pinconf_pins_show, inode->i_private);
352 static int pinconf_groups_open(struct inode *inode, struct file *file)
354 return single_open(file, pinconf_groups_show, inode->i_private);
357 static const struct file_operations pinconf_pins_ops = {
358 .open = pinconf_pins_open,
361 .release = single_release,
364 static const struct file_operations pinconf_groups_ops = {
365 .open = pinconf_groups_open,
368 .release = single_release,
371 void pinconf_init_device_debugfs(struct dentry *devroot,
372 struct pinctrl_dev *pctldev)
374 debugfs_create_file("pinconf-pins", S_IFREG | S_IRUGO,
375 devroot, pctldev, &pinconf_pins_ops);
376 debugfs_create_file("pinconf-groups", S_IFREG | S_IRUGO,
377 devroot, pctldev, &pinconf_groups_ops);