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 pin_config_get_for_pin(struct pinctrl_dev *pctldev, unsigned pin,
27 unsigned long *config)
29 const struct pinconf_ops *ops = pctldev->desc->confops;
31 if (!ops || !ops->pin_config_get) {
32 dev_err(pctldev->dev, "cannot get pin configuration, missing "
33 "pin_config_get() function in driver\n");
37 return ops->pin_config_get(pctldev, pin, config);
41 * pin_config_get() - get the configuration of a single pin parameter
42 * @dev_name: name of the pin controller device for this pin
43 * @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.
48 int pin_config_get(const char *dev_name, const char *name,
49 unsigned long *config)
51 struct pinctrl_dev *pctldev;
54 pctldev = get_pinctrl_dev_from_dev(NULL, dev_name);
58 pin = pin_get_from_name(pctldev, name);
62 return pin_config_get_for_pin(pctldev, pin, config);
64 EXPORT_SYMBOL(pin_config_get);
66 int pin_config_set_for_pin(struct pinctrl_dev *pctldev, unsigned pin,
69 const struct pinconf_ops *ops = pctldev->desc->confops;
72 if (!ops || !ops->pin_config_set) {
73 dev_err(pctldev->dev, "cannot configure pin, missing "
74 "config function in driver\n");
78 ret = ops->pin_config_set(pctldev, pin, config);
81 "unable to set pin configuration on pin %d\n", pin);
89 * pin_config_set() - set the configuration of a single pin parameter
90 * @dev_name: name of pin controller device for this pin
91 * @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
96 int pin_config_set(const char *dev_name, const char *name,
99 struct pinctrl_dev *pctldev;
102 pctldev = get_pinctrl_dev_from_dev(NULL, dev_name);
106 pin = pin_get_from_name(pctldev, name);
110 return pin_config_set_for_pin(pctldev, pin, config);
112 EXPORT_SYMBOL(pin_config_set);
114 int pin_config_group_get(const char *dev_name, const char *pin_group,
115 unsigned long *config)
117 struct pinctrl_dev *pctldev;
118 const struct pinconf_ops *ops;
121 pctldev = get_pinctrl_dev_from_dev(NULL, dev_name);
124 ops = pctldev->desc->confops;
126 if (!ops || !ops->pin_config_group_get) {
127 dev_err(pctldev->dev, "cannot get configuration for pin "
128 "group, missing group config get function in "
133 selector = pinctrl_get_group_selector(pctldev, pin_group);
137 return ops->pin_config_group_get(pctldev, selector, config);
139 EXPORT_SYMBOL(pin_config_group_get);
142 int pin_config_group_set(const char *dev_name, const char *pin_group,
143 unsigned long config)
145 struct pinctrl_dev *pctldev;
146 const struct pinconf_ops *ops;
147 const struct pinctrl_ops *pctlops;
149 const unsigned *pins;
154 pctldev = get_pinctrl_dev_from_dev(NULL, dev_name);
157 ops = pctldev->desc->confops;
158 pctlops = pctldev->desc->pctlops;
160 if (!ops || (!ops->pin_config_group_set && !ops->pin_config_set)) {
161 dev_err(pctldev->dev, "cannot configure pin group, missing "
162 "config function in driver\n");
166 selector = pinctrl_get_group_selector(pctldev, pin_group);
170 ret = pctlops->get_group_pins(pctldev, selector, &pins, &num_pins);
172 dev_err(pctldev->dev, "cannot configure pin group, error "
178 * If the pin controller supports handling entire groups we use that
181 if (ops->pin_config_group_set) {
182 ret = ops->pin_config_group_set(pctldev, selector, config);
184 * If the pin controller prefer that a certain group be handled
185 * pin-by-pin as well, it returns -EAGAIN.
192 * If the controller cannot handle entire groups, we configure each pin
195 if (!ops->pin_config_set)
198 for (i = 0; i < num_pins; i++) {
199 ret = ops->pin_config_set(pctldev, pins[i], config);
206 EXPORT_SYMBOL(pin_config_group_set);
208 int pinconf_check_ops(const struct pinconf_ops *ops)
210 /* We must be able to read out pin status */
211 if (!ops->pin_config_get && !ops->pin_config_group_get)
213 /* We have to be able to config the pins in SOME way */
214 if (!ops->pin_config_set && !ops->pin_config_group_set)
219 #ifdef CONFIG_DEBUG_FS
221 static void pinconf_dump_pin(struct pinctrl_dev *pctldev,
222 struct seq_file *s, int pin)
224 const struct pinconf_ops *ops = pctldev->desc->confops;
226 if (ops && ops->pin_config_dbg_show)
227 ops->pin_config_dbg_show(pctldev, s, pin);
230 static int pinconf_pins_show(struct seq_file *s, void *what)
232 struct pinctrl_dev *pctldev = s->private;
235 seq_puts(s, "Pin config settings per pin\n");
236 seq_puts(s, "Format: pin (name): pinmux setting array\n");
238 /* The pin number can be retrived from the pin controller descriptor */
239 for (i = 0; pin < pctldev->desc->npins; i++) {
240 struct pin_desc *desc;
242 pin = pctldev->desc->pins[i].number;
243 desc = pin_desc_get(pctldev, pin);
244 /* Skip if we cannot search the pin */
248 seq_printf(s, "pin %d (%s):", pin,
249 desc->name ? desc->name : "unnamed");
251 pinconf_dump_pin(pctldev, s, pin);
259 static void pinconf_dump_group(struct pinctrl_dev *pctldev,
260 struct seq_file *s, unsigned selector,
263 const struct pinconf_ops *ops = pctldev->desc->confops;
265 if (ops && ops->pin_config_group_dbg_show)
266 ops->pin_config_group_dbg_show(pctldev, s, selector);
269 static int pinconf_groups_show(struct seq_file *s, void *what)
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;
276 if (!ops || !ops->pin_config_group_get)
279 seq_puts(s, "Pin config settings per pin group\n");
280 seq_puts(s, "Format: group (name): pinmux setting array\n");
282 while (pctlops->list_groups(pctldev, selector) >= 0) {
283 const char *gname = pctlops->get_group_name(pctldev, selector);
285 seq_printf(s, "%u (%s):", selector, gname);
286 pinconf_dump_group(pctldev, s, selector, gname);
293 static int pinconf_pins_open(struct inode *inode, struct file *file)
295 return single_open(file, pinconf_pins_show, inode->i_private);
298 static int pinconf_groups_open(struct inode *inode, struct file *file)
300 return single_open(file, pinconf_groups_show, inode->i_private);
303 static const struct file_operations pinconf_pins_ops = {
304 .open = pinconf_pins_open,
307 .release = single_release,
310 static const struct file_operations pinconf_groups_ops = {
311 .open = pinconf_groups_open,
314 .release = single_release,
317 void pinconf_init_device_debugfs(struct dentry *devroot,
318 struct pinctrl_dev *pctldev)
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);