2 * Core driver for the pin muxing portions of the pin control subsystem
4 * Copyright (C) 2011-2012 ST-Ericsson SA
5 * Written on behalf of Linaro for ST-Ericsson
6 * Based on bits of regulator core, gpio core and clk core
8 * Author: Linus Walleij <linus.walleij@linaro.org>
10 * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
12 * License terms: GNU General Public License (GPL) version 2
14 #define pr_fmt(fmt) "pinmux core: " fmt
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/device.h>
20 #include <linux/slab.h>
21 #include <linux/radix-tree.h>
22 #include <linux/err.h>
23 #include <linux/list.h>
24 #include <linux/string.h>
25 #include <linux/sysfs.h>
26 #include <linux/debugfs.h>
27 #include <linux/seq_file.h>
28 #include <linux/pinctrl/machine.h>
29 #include <linux/pinctrl/pinmux.h>
33 int pinmux_check_ops(struct pinctrl_dev *pctldev)
35 const struct pinmux_ops *ops = pctldev->desc->pmxops;
37 unsigned selector = 0;
39 /* Check that we implement required operations */
41 !ops->get_functions_count ||
42 !ops->get_function_name ||
43 !ops->get_function_groups ||
45 dev_err(pctldev->dev, "pinmux ops lacks necessary functions\n");
48 /* Check that all functions registered have names */
49 nfuncs = ops->get_functions_count(pctldev);
50 while (selector < nfuncs) {
51 const char *fname = ops->get_function_name(pctldev,
54 dev_err(pctldev->dev, "pinmux ops has no name for function%u\n",
64 int pinmux_validate_map(struct pinctrl_map const *map, int i)
66 if (!map->data.mux.function) {
67 pr_err("failed to register map %s (%d): no function given\n",
76 * pin_request() - request a single pin to be muxed in, typically for GPIO
77 * @pin: the pin number in the global pin space
78 * @owner: a representation of the owner of this pin; typically the device
79 * name that controls its mux function, or the requested GPIO name
80 * @gpio_range: the range matching the GPIO pin if this is a request for a
83 static int pin_request(struct pinctrl_dev *pctldev,
84 int pin, const char *owner,
85 struct pinctrl_gpio_range *gpio_range)
87 struct pin_desc *desc;
88 const struct pinmux_ops *ops = pctldev->desc->pmxops;
91 desc = pin_desc_get(pctldev, pin);
94 "pin %d is not registered so it cannot be requested\n",
99 dev_dbg(pctldev->dev, "request pin %d (%s) for %s\n",
100 pin, desc->name, owner);
103 /* There's no need to support multiple GPIO requests */
104 if (desc->gpio_owner) {
105 dev_err(pctldev->dev,
106 "pin %s already requested by %s; cannot claim for %s\n",
107 desc->name, desc->gpio_owner, owner);
110 if (ops->strict && desc->mux_usecount &&
111 strcmp(desc->mux_owner, owner)) {
112 dev_err(pctldev->dev,
113 "pin %s already requested by %s; cannot claim for %s\n",
114 desc->name, desc->mux_owner, owner);
118 desc->gpio_owner = owner;
120 if (desc->mux_usecount && strcmp(desc->mux_owner, owner)) {
121 dev_err(pctldev->dev,
122 "pin %s already requested by %s; cannot claim for %s\n",
123 desc->name, desc->mux_owner, owner);
126 if (ops->strict && desc->gpio_owner) {
127 dev_err(pctldev->dev,
128 "pin %s already requested by %s; cannot claim for %s\n",
129 desc->name, desc->gpio_owner, owner);
133 desc->mux_usecount++;
134 if (desc->mux_usecount > 1)
137 desc->mux_owner = owner;
140 /* Let each pin increase references to this module */
141 if (!try_module_get(pctldev->owner)) {
142 dev_err(pctldev->dev,
143 "could not increase module refcount for pin %d\n",
150 * If there is no kind of request function for the pin we just assume
151 * we got it by default and proceed.
153 if (gpio_range && ops->gpio_request_enable)
154 /* This requests and enables a single GPIO pin */
155 status = ops->gpio_request_enable(pctldev, gpio_range, pin);
156 else if (ops->request)
157 status = ops->request(pctldev, pin);
162 dev_err(pctldev->dev, "request() failed for pin %d\n", pin);
163 module_put(pctldev->owner);
169 desc->gpio_owner = NULL;
171 desc->mux_usecount--;
172 if (!desc->mux_usecount)
173 desc->mux_owner = NULL;
178 dev_err(pctldev->dev, "pin-%d (%s) status %d\n",
185 * pin_free() - release a single muxed in pin so something else can be muxed
186 * @pctldev: pin controller device handling this pin
187 * @pin: the pin to free
188 * @gpio_range: the range matching the GPIO pin if this is a request for a
191 * This function returns a pointer to the previous owner. This is used
192 * for callers that dynamically allocate an owner name so it can be freed
193 * once the pin is free. This is done for GPIO request functions.
195 static const char *pin_free(struct pinctrl_dev *pctldev, int pin,
196 struct pinctrl_gpio_range *gpio_range)
198 const struct pinmux_ops *ops = pctldev->desc->pmxops;
199 struct pin_desc *desc;
202 desc = pin_desc_get(pctldev, pin);
204 dev_err(pctldev->dev,
205 "pin is not registered so it cannot be freed\n");
211 * A pin should not be freed more times than allocated.
213 if (WARN_ON(!desc->mux_usecount))
215 desc->mux_usecount--;
216 if (desc->mux_usecount)
221 * If there is no kind of request function for the pin we just assume
222 * we got it by default and proceed.
224 if (gpio_range && ops->gpio_disable_free)
225 ops->gpio_disable_free(pctldev, gpio_range, pin);
227 ops->free(pctldev, pin);
230 owner = desc->gpio_owner;
231 desc->gpio_owner = NULL;
233 owner = desc->mux_owner;
234 desc->mux_owner = NULL;
235 desc->mux_setting = NULL;
238 module_put(pctldev->owner);
244 * pinmux_request_gpio() - request pinmuxing for a GPIO pin
245 * @pctldev: pin controller device affected
246 * @pin: the pin to mux in for GPIO
247 * @range: the applicable GPIO range
249 int pinmux_request_gpio(struct pinctrl_dev *pctldev,
250 struct pinctrl_gpio_range *range,
251 unsigned pin, unsigned gpio)
256 /* Conjure some name stating what chip and pin this is taken by */
257 owner = kasprintf(GFP_KERNEL, "%s:%d", range->name, gpio);
261 ret = pin_request(pctldev, pin, owner, range);
269 * pinmux_free_gpio() - release a pin from GPIO muxing
270 * @pctldev: the pin controller device for the pin
271 * @pin: the affected currently GPIO-muxed in pin
272 * @range: applicable GPIO range
274 void pinmux_free_gpio(struct pinctrl_dev *pctldev, unsigned pin,
275 struct pinctrl_gpio_range *range)
279 owner = pin_free(pctldev, pin, range);
284 * pinmux_gpio_direction() - set the direction of a single muxed-in GPIO pin
285 * @pctldev: the pin controller handling this pin
286 * @range: applicable GPIO range
287 * @pin: the affected GPIO pin in this controller
288 * @input: true if we set the pin as input, false for output
290 int pinmux_gpio_direction(struct pinctrl_dev *pctldev,
291 struct pinctrl_gpio_range *range,
292 unsigned pin, bool input)
294 const struct pinmux_ops *ops;
297 ops = pctldev->desc->pmxops;
299 if (ops->gpio_set_direction)
300 ret = ops->gpio_set_direction(pctldev, range, pin, input);
307 static int pinmux_func_name_to_selector(struct pinctrl_dev *pctldev,
308 const char *function)
310 const struct pinmux_ops *ops = pctldev->desc->pmxops;
311 unsigned nfuncs = ops->get_functions_count(pctldev);
312 unsigned selector = 0;
314 /* See if this pctldev has this function */
315 while (selector < nfuncs) {
316 const char *fname = ops->get_function_name(pctldev,
319 if (!strcmp(function, fname))
325 pr_err("%s does not support function %s\n",
326 pinctrl_dev_get_name(pctldev), function);
330 int pinmux_map_to_setting(struct pinctrl_map const *map,
331 struct pinctrl_setting *setting)
333 struct pinctrl_dev *pctldev = setting->pctldev;
334 const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
335 char const * const *groups;
342 dev_err(pctldev->dev, "does not support mux function\n");
346 ret = pinmux_func_name_to_selector(pctldev, map->data.mux.function);
348 dev_err(pctldev->dev, "invalid function %s in map table\n",
349 map->data.mux.function);
352 setting->data.mux.func = ret;
354 ret = pmxops->get_function_groups(pctldev, setting->data.mux.func,
355 &groups, &num_groups);
357 dev_err(pctldev->dev, "can't query groups for function %s\n",
358 map->data.mux.function);
362 dev_err(pctldev->dev,
363 "function %s can't be selected on any group\n",
364 map->data.mux.function);
367 if (map->data.mux.group) {
369 group = map->data.mux.group;
370 for (i = 0; i < num_groups; i++) {
371 if (!strcmp(group, groups[i])) {
377 dev_err(pctldev->dev,
378 "invalid group \"%s\" for function \"%s\"\n",
379 group, map->data.mux.function);
386 ret = pinctrl_get_group_selector(pctldev, group);
388 dev_err(pctldev->dev, "invalid group %s in map table\n",
389 map->data.mux.group);
392 setting->data.mux.group = ret;
397 void pinmux_free_setting(struct pinctrl_setting const *setting)
399 /* This function is currently unused */
402 int pinmux_enable_setting(struct pinctrl_setting const *setting)
404 struct pinctrl_dev *pctldev = setting->pctldev;
405 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
406 const struct pinmux_ops *ops = pctldev->desc->pmxops;
408 const unsigned *pins = NULL;
409 unsigned num_pins = 0;
411 struct pin_desc *desc;
413 if (pctlops->get_group_pins)
414 ret = pctlops->get_group_pins(pctldev, setting->data.mux.group,
420 /* errors only affect debug data, so just warn */
421 gname = pctlops->get_group_name(pctldev,
422 setting->data.mux.group);
423 dev_warn(pctldev->dev,
424 "could not get pins for group %s\n",
429 /* Try to allocate all pins in this group, one by one */
430 for (i = 0; i < num_pins; i++) {
431 ret = pin_request(pctldev, pins[i], setting->dev_name, NULL);
436 desc = pin_desc_get(pctldev, pins[i]);
437 pname = desc ? desc->name : "non-existing";
438 gname = pctlops->get_group_name(pctldev,
439 setting->data.mux.group);
440 dev_err(pctldev->dev,
441 "could not request pin %d (%s) from group %s "
443 pins[i], pname, gname,
444 pinctrl_dev_get_name(pctldev));
445 goto err_pin_request;
449 /* Now that we have acquired the pins, encode the mux setting */
450 for (i = 0; i < num_pins; i++) {
451 desc = pin_desc_get(pctldev, pins[i]);
453 dev_warn(pctldev->dev,
454 "could not get pin desc for pin %d\n",
458 desc->mux_setting = &(setting->data.mux);
461 ret = ops->set_mux(pctldev, setting->data.mux.func,
462 setting->data.mux.group);
470 for (i = 0; i < num_pins; i++) {
471 desc = pin_desc_get(pctldev, pins[i]);
473 desc->mux_setting = NULL;
476 /* On error release all taken pins */
478 pin_free(pctldev, pins[i], NULL);
483 void pinmux_disable_setting(struct pinctrl_setting const *setting)
485 struct pinctrl_dev *pctldev = setting->pctldev;
486 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
488 const unsigned *pins = NULL;
489 unsigned num_pins = 0;
491 struct pin_desc *desc;
493 if (pctlops->get_group_pins)
494 ret = pctlops->get_group_pins(pctldev, setting->data.mux.group,
499 /* errors only affect debug data, so just warn */
500 gname = pctlops->get_group_name(pctldev,
501 setting->data.mux.group);
502 dev_warn(pctldev->dev,
503 "could not get pins for group %s\n",
508 /* Flag the descs that no setting is active */
509 for (i = 0; i < num_pins; i++) {
510 desc = pin_desc_get(pctldev, pins[i]);
512 dev_warn(pctldev->dev,
513 "could not get pin desc for pin %d\n",
517 if (desc->mux_setting == &(setting->data.mux)) {
518 desc->mux_setting = NULL;
519 /* And release the pin */
520 pin_free(pctldev, pins[i], NULL);
524 gname = pctlops->get_group_name(pctldev,
525 setting->data.mux.group);
526 dev_warn(pctldev->dev,
527 "not freeing pin %d (%s) as part of "
528 "deactivating group %s - it is already "
529 "used for some other setting",
530 pins[i], desc->name, gname);
535 #ifdef CONFIG_DEBUG_FS
537 /* Called from pincontrol core */
538 static int pinmux_functions_show(struct seq_file *s, void *what)
540 struct pinctrl_dev *pctldev = s->private;
541 const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
543 unsigned func_selector = 0;
548 mutex_lock(&pctldev->mutex);
549 nfuncs = pmxops->get_functions_count(pctldev);
550 while (func_selector < nfuncs) {
551 const char *func = pmxops->get_function_name(pctldev,
553 const char * const *groups;
558 ret = pmxops->get_function_groups(pctldev, func_selector,
559 &groups, &num_groups);
561 seq_printf(s, "function %s: COULD NOT GET GROUPS\n",
567 seq_printf(s, "function: %s, groups = [ ", func);
568 for (i = 0; i < num_groups; i++)
569 seq_printf(s, "%s ", groups[i]);
575 mutex_unlock(&pctldev->mutex);
580 static int pinmux_pins_show(struct seq_file *s, void *what)
582 struct pinctrl_dev *pctldev = s->private;
583 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
584 const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
590 seq_puts(s, "Pinmux settings per pin\n");
593 "Format: pin (name): mux_owner|gpio_owner (strict) hog?\n");
596 "Format: pin (name): mux_owner gpio_owner hog?\n");
598 mutex_lock(&pctldev->mutex);
600 /* The pin number can be retrived from the pin controller descriptor */
601 for (i = 0; i < pctldev->desc->npins; i++) {
602 struct pin_desc *desc;
605 pin = pctldev->desc->pins[i].number;
606 desc = pin_desc_get(pctldev, pin);
607 /* Skip if we cannot search the pin */
611 if (desc->mux_owner &&
612 !strcmp(desc->mux_owner, pinctrl_dev_get_name(pctldev)))
615 if (pmxops->strict) {
617 seq_printf(s, "pin %d (%s): device %s%s",
619 desc->name ? desc->name : "unnamed",
621 is_hog ? " (HOG)" : "");
622 else if (desc->gpio_owner)
623 seq_printf(s, "pin %d (%s): GPIO %s",
625 desc->name ? desc->name : "unnamed",
628 seq_printf(s, "pin %d (%s): UNCLAIMED",
630 desc->name ? desc->name : "unnamed");
632 /* For non-strict controllers */
633 seq_printf(s, "pin %d (%s): %s %s%s", pin,
634 desc->name ? desc->name : "unnamed",
635 desc->mux_owner ? desc->mux_owner
637 desc->gpio_owner ? desc->gpio_owner
638 : "(GPIO UNCLAIMED)",
639 is_hog ? " (HOG)" : "");
642 /* If mux: print function+group claiming the pin */
643 if (desc->mux_setting)
644 seq_printf(s, " function %s group %s\n",
645 pmxops->get_function_name(pctldev,
646 desc->mux_setting->func),
647 pctlops->get_group_name(pctldev,
648 desc->mux_setting->group));
653 mutex_unlock(&pctldev->mutex);
658 void pinmux_show_map(struct seq_file *s, struct pinctrl_map const *map)
660 seq_printf(s, "group %s\nfunction %s\n",
661 map->data.mux.group ? map->data.mux.group : "(default)",
662 map->data.mux.function);
665 void pinmux_show_setting(struct seq_file *s,
666 struct pinctrl_setting const *setting)
668 struct pinctrl_dev *pctldev = setting->pctldev;
669 const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
670 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
672 seq_printf(s, "group: %s (%u) function: %s (%u)\n",
673 pctlops->get_group_name(pctldev, setting->data.mux.group),
674 setting->data.mux.group,
675 pmxops->get_function_name(pctldev, setting->data.mux.func),
676 setting->data.mux.func);
679 static int pinmux_functions_open(struct inode *inode, struct file *file)
681 return single_open(file, pinmux_functions_show, inode->i_private);
684 static int pinmux_pins_open(struct inode *inode, struct file *file)
686 return single_open(file, pinmux_pins_show, inode->i_private);
689 static const struct file_operations pinmux_functions_ops = {
690 .open = pinmux_functions_open,
693 .release = single_release,
696 static const struct file_operations pinmux_pins_ops = {
697 .open = pinmux_pins_open,
700 .release = single_release,
703 void pinmux_init_device_debugfs(struct dentry *devroot,
704 struct pinctrl_dev *pctldev)
706 debugfs_create_file("pinmux-functions", S_IFREG | S_IRUGO,
707 devroot, pctldev, &pinmux_functions_ops);
708 debugfs_create_file("pinmux-pins", S_IFREG | S_IRUGO,
709 devroot, pctldev, &pinmux_pins_ops);
712 #endif /* CONFIG_DEBUG_FS */