[linux-2.6-block.git] / drivers / pinctrl / pinconf.c

/*
 * Core driver for the pin config portions of the pin control subsystem
 *
 * Copyright (C) 2011 ST-Ericsson SA
 * Written on behalf of Linaro for ST-Ericsson
 *
 * Author: Linus Walleij <linus.walleij@linaro.org>
 *
 * License terms: GNU General Public License (GPL) version 2
 */
#define pr_fmt(fmt) "pinconfig core: " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinconf.h>
#include "core.h"
#include "pinconf.h"

int pinconf_check_ops(struct pinctrl_dev *pctldev)
{
	const struct pinconf_ops *ops = pctldev->desc->confops;

	/* We have to be able to config the pins in SOME way */
	if (!ops->pin_config_set && !ops->pin_config_group_set) {
		dev_err(pctldev->dev,
			"pinconf has to be able to set a pins config\n");
		return -EINVAL;
	}
	return 0;
}

int pinconf_validate_map(struct pinctrl_map const *map, int i)
{
	if (!map->data.configs.group_or_pin) {
		pr_err("failed to register map %s (%d): no group/pin given\n",
		       map->name, i);
		return -EINVAL;
	}

	if (!map->data.configs.num_configs ||
			!map->data.configs.configs) {
		pr_err("failed to register map %s (%d): no configs given\n",
		       map->name, i);
		return -EINVAL;
	}

	return 0;
}

int pin_config_get_for_pin(struct pinctrl_dev *pctldev, unsigned pin,
			   unsigned long *config)
{
	const struct pinconf_ops *ops = pctldev->desc->confops;

	if (!ops || !ops->pin_config_get) {
		dev_dbg(pctldev->dev,
			"cannot get pin configuration, .pin_config_get missing in driver\n");
		return -ENOTSUPP;
	}

	return ops->pin_config_get(pctldev, pin, config);
}

int pin_config_group_get(const char *dev_name, const char *pin_group,
			 unsigned long *config)
{
	struct pinctrl_dev *pctldev;
	const struct pinconf_ops *ops;
	int selector, ret;

	pctldev = get_pinctrl_dev_from_devname(dev_name);
	if (!pctldev) {
		ret = -EINVAL;
		return ret;
	}

	mutex_lock(&pctldev->mutex);

	ops = pctldev->desc->confops;

	if (!ops || !ops->pin_config_group_get) {
		dev_dbg(pctldev->dev,
			"cannot get configuration for pin group, missing group config get function in driver\n");
		ret = -ENOTSUPP;
		goto unlock;
	}

	selector = pinctrl_get_group_selector(pctldev, pin_group);
	if (selector < 0) {
		ret = selector;
		goto unlock;
	}

	ret = ops->pin_config_group_get(pctldev, selector, config);

unlock:
	mutex_unlock(&pctldev->mutex);
	return ret;
}

int pinconf_map_to_setting(struct pinctrl_map const *map,
			  struct pinctrl_setting *setting)
{
	struct pinctrl_dev *pctldev = setting->pctldev;
	int pin;

	switch (setting->type) {
	case PIN_MAP_TYPE_CONFIGS_PIN:
		pin = pin_get_from_name(pctldev,
					map->data.configs.group_or_pin);
		if (pin < 0) {
			dev_err(pctldev->dev, "could not map pin config for \"%s\"",
				map->data.configs.group_or_pin);
			return pin;
		}
		setting->data.configs.group_or_pin = pin;
		break;
	case PIN_MAP_TYPE_CONFIGS_GROUP:
		pin = pinctrl_get_group_selector(pctldev,
					 map->data.configs.group_or_pin);
		if (pin < 0) {
			dev_err(pctldev->dev, "could not map group config for \"%s\"",
				map->data.configs.group_or_pin);
			return pin;
		}
		setting->data.configs.group_or_pin = pin;
		break;
	default:
		return -EINVAL;
	}

	setting->data.configs.num_configs = map->data.configs.num_configs;
	setting->data.configs.configs = map->data.configs.configs;

	return 0;
}

void pinconf_free_setting(struct pinctrl_setting const *setting)
{
}

int pinconf_apply_setting(struct pinctrl_setting const *setting)
{
	struct pinctrl_dev *pctldev = setting->pctldev;
	const struct pinconf_ops *ops = pctldev->desc->confops;
	int ret;

	if (!ops) {
		dev_err(pctldev->dev, "missing confops\n");
		return -EINVAL;
	}

	switch (setting->type) {
	case PIN_MAP_TYPE_CONFIGS_PIN:
		if (!ops->pin_config_set) {
			dev_err(pctldev->dev, "missing pin_config_set op\n");
			return -EINVAL;
		}
		ret = ops->pin_config_set(pctldev,
				setting->data.configs.group_or_pin,
				setting->data.configs.configs,
				setting->data.configs.num_configs);
		if (ret < 0) {
			dev_err(pctldev->dev,
				"pin_config_set op failed for pin %d\n",
				setting->data.configs.group_or_pin);
			return ret;
		}
		break;
	case PIN_MAP_TYPE_CONFIGS_GROUP:
		if (!ops->pin_config_group_set) {
			dev_err(pctldev->dev,
				"missing pin_config_group_set op\n");
			return -EINVAL;
		}
		ret = ops->pin_config_group_set(pctldev,
				setting->data.configs.group_or_pin,
				setting->data.configs.configs,
				setting->data.configs.num_configs);
		if (ret < 0) {
			dev_err(pctldev->dev,
				"pin_config_group_set op failed for group %d\n",
				setting->data.configs.group_or_pin);
			return ret;
		}
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

int pinconf_set_config(struct pinctrl_dev *pctldev, unsigned pin,
		       unsigned long *configs, size_t nconfigs)
{
	const struct pinconf_ops *ops;

	ops = pctldev->desc->confops;
	if (!ops)
		return -ENOTSUPP;

	return ops->pin_config_set(pctldev, pin, configs, nconfigs);
}

#ifdef CONFIG_DEBUG_FS

static void pinconf_show_config(struct seq_file *s, struct pinctrl_dev *pctldev,
		      unsigned long *configs, unsigned num_configs)
{
	const struct pinconf_ops *confops;
	int i;

	if (pctldev)
		confops = pctldev->desc->confops;
	else
		confops = NULL;

	for (i = 0; i < num_configs; i++) {
		seq_puts(s, "config ");
		if (confops && confops->pin_config_config_dbg_show)
			confops->pin_config_config_dbg_show(pctldev, s,
							    configs[i]);
		else
			seq_printf(s, "%08lx", configs[i]);
		seq_putc(s, '\n');
	}
}

void pinconf_show_map(struct seq_file *s, struct pinctrl_map const *map)
{
	struct pinctrl_dev *pctldev;

	pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name);

	switch (map->type) {
	case PIN_MAP_TYPE_CONFIGS_PIN:
		seq_puts(s, "pin ");
		break;
	case PIN_MAP_TYPE_CONFIGS_GROUP:
		seq_puts(s, "group ");
		break;
	default:
		break;
	}

	seq_printf(s, "%s\n", map->data.configs.group_or_pin);

	pinconf_show_config(s, pctldev, map->data.configs.configs,
			    map->data.configs.num_configs);
}

void pinconf_show_setting(struct seq_file *s,
			  struct pinctrl_setting const *setting)
{
	struct pinctrl_dev *pctldev = setting->pctldev;
	const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
	struct pin_desc *desc;

	switch (setting->type) {
	case PIN_MAP_TYPE_CONFIGS_PIN:
		desc = pin_desc_get(setting->pctldev,
				    setting->data.configs.group_or_pin);
		seq_printf(s, "pin %s (%d)", desc->name,
			   setting->data.configs.group_or_pin);
		break;
	case PIN_MAP_TYPE_CONFIGS_GROUP:
		seq_printf(s, "group %s (%d)",
			   pctlops->get_group_name(pctldev,
					setting->data.configs.group_or_pin),
			   setting->data.configs.group_or_pin);
		break;
	default:
		break;
	}

	/*
	 * FIXME: We should really get the pin controller to dump the config
	 * values, so they can be decoded to something meaningful.
	 */
	pinconf_show_config(s, pctldev, setting->data.configs.configs,
			    setting->data.configs.num_configs);
}

static void pinconf_dump_pin(struct pinctrl_dev *pctldev,
			     struct seq_file *s, int pin)
{
	const struct pinconf_ops *ops = pctldev->desc->confops;

	/* no-op when not using generic pin config */
	pinconf_generic_dump_pins(pctldev, s, NULL, pin);
	if (ops && ops->pin_config_dbg_show)
		ops->pin_config_dbg_show(pctldev, s, pin);
}

static int pinconf_pins_show(struct seq_file *s, void *what)
{
	struct pinctrl_dev *pctldev = s->private;
	unsigned i, pin;

	seq_puts(s, "Pin config settings per pin\n");
	seq_puts(s, "Format: pin (name): configs\n");

	mutex_lock(&pctldev->mutex);

	/* The pin number can be retrived from the pin controller descriptor */
	for (i = 0; i < pctldev->desc->npins; i++) {
		struct pin_desc *desc;

		pin = pctldev->desc->pins[i].number;
		desc = pin_desc_get(pctldev, pin);
		/* Skip if we cannot search the pin */
		if (!desc)
			continue;

		seq_printf(s, "pin %d (%s): ", pin, desc->name);

		pinconf_dump_pin(pctldev, s, pin);
		seq_putc(s, '\n');
	}

	mutex_unlock(&pctldev->mutex);

	return 0;
}

static void pinconf_dump_group(struct pinctrl_dev *pctldev,
			       struct seq_file *s, unsigned selector,
			       const char *gname)
{
	const struct pinconf_ops *ops = pctldev->desc->confops;

	/* no-op when not using generic pin config */
	pinconf_generic_dump_pins(pctldev, s, gname, 0);
	if (ops && ops->pin_config_group_dbg_show)
		ops->pin_config_group_dbg_show(pctldev, s, selector);
}

static int pinconf_groups_show(struct seq_file *s, void *what)
{
	struct pinctrl_dev *pctldev = s->private;
	const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
	unsigned ngroups = pctlops->get_groups_count(pctldev);
	unsigned selector = 0;

	seq_puts(s, "Pin config settings per pin group\n");
	seq_puts(s, "Format: group (name): configs\n");

	while (selector < ngroups) {
		const char *gname = pctlops->get_group_name(pctldev, selector);

		seq_printf(s, "%u (%s): ", selector, gname);
		pinconf_dump_group(pctldev, s, selector, gname);
		seq_putc(s, '\n');
		selector++;
	}

	return 0;
}

static int pinconf_pins_open(struct inode *inode, struct file *file)
{
	return single_open(file, pinconf_pins_show, inode->i_private);
}

static int pinconf_groups_open(struct inode *inode, struct file *file)
{
	return single_open(file, pinconf_groups_show, inode->i_private);
}

static const struct file_operations pinconf_pins_ops = {
	.open		= pinconf_pins_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static const struct file_operations pinconf_groups_ops = {
	.open		= pinconf_groups_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

#define MAX_NAME_LEN 15

struct dbg_cfg {
	enum pinctrl_map_type map_type;
	char dev_name[MAX_NAME_LEN + 1];
	char state_name[MAX_NAME_LEN + 1];
	char pin_name[MAX_NAME_LEN + 1];
};

/*
 * Goal is to keep this structure as global in order to simply read the
 * pinconf-config file after a write to check config is as expected
 */
static struct dbg_cfg pinconf_dbg_conf;

/**
 * pinconf_dbg_config_print() - display the pinctrl config from the pinctrl
 * map, of the dev/pin/state that was last written to pinconf-config file.
 * @s: string filled in  with config description
 * @d: not used
 */
static int pinconf_dbg_config_print(struct seq_file *s, void *d)
{
	struct pinctrl_maps *maps_node;
	const struct pinctrl_map *map;
	const struct pinctrl_map *found = NULL;
	struct pinctrl_dev *pctldev;
	struct dbg_cfg *dbg = &pinconf_dbg_conf;
	int i;

	mutex_lock(&pinctrl_maps_mutex);

	/* Parse the pinctrl map and look for the elected pin/state */
	for_each_maps(maps_node, i, map) {
		if (map->type != dbg->map_type)
			continue;
		if (strcmp(map->dev_name, dbg->dev_name))
			continue;
		if (strcmp(map->name, dbg->state_name))
			continue;

		if (!strcmp(map->data.configs.group_or_pin, dbg->pin_name)) {
			/* We found the right pin */
			found = map;
			break;
		}
	}

	if (!found) {
		seq_printf(s, "No config found for dev/state/pin, expected:\n");
		seq_printf(s, "Searched dev:%s\n", dbg->dev_name);
		seq_printf(s, "Searched state:%s\n", dbg->state_name);
		seq_printf(s, "Searched pin:%s\n", dbg->pin_name);
		seq_printf(s, "Use: modify config_pin <devname> "\
				"<state> <pinname> <value>\n");
		goto exit;
	}

	pctldev = get_pinctrl_dev_from_devname(found->ctrl_dev_name);
	seq_printf(s, "Dev %s has config of %s in state %s:\n",
		   dbg->dev_name, dbg->pin_name, dbg->state_name);
	pinconf_show_config(s, pctldev, found->data.configs.configs,
			    found->data.configs.num_configs);

exit:
	mutex_unlock(&pinctrl_maps_mutex);

	return 0;
}

/**
 * pinconf_dbg_config_write() - modify the pinctrl config in the pinctrl
 * map, of a dev/pin/state entry based on user entries to pinconf-config
 * @user_buf: contains the modification request with expected format:
 *     modify <config> <devicename> <state> <name> <newvalue>
 * modify is literal string, alternatives like add/delete not supported yet
 * <config> is the configuration to be changed. Supported configs are
 *     "config_pin" or "config_group", alternatives like config_mux are not
 *     supported yet.
 * <devicename> <state> <name> are values that should match the pinctrl-maps
 * <newvalue> reflects the new config and is driver dependent
 */
static ssize_t pinconf_dbg_config_write(struct file *file,
	const char __user *user_buf, size_t count, loff_t *ppos)
{
	struct pinctrl_maps *maps_node;
	const struct pinctrl_map *map;
	const struct pinctrl_map *found = NULL;
	struct pinctrl_dev *pctldev;
	const struct pinconf_ops *confops = NULL;
	struct dbg_cfg *dbg = &pinconf_dbg_conf;
	const struct pinctrl_map_configs *configs;
	char config[MAX_NAME_LEN + 1];
	char buf[128];
	char *b = &buf[0];
	int buf_size;
	char *token;
	int i;

	/* Get userspace string and assure termination */
	buf_size = min(count, sizeof(buf) - 1);
	if (copy_from_user(buf, user_buf, buf_size))
		return -EFAULT;
	buf[buf_size] = 0;

	/*
	 * need to parse entry and extract parameters:
	 * modify configs_pin devicename state pinname newvalue
	 */

	/* Get arg: 'modify' */
	token = strsep(&b, " ");
	if (!token)
		return -EINVAL;
	if (strcmp(token, "modify"))
		return -EINVAL;

	/*
	 * Get arg type: "config_pin" and "config_group"
	 *                types are supported so far
	 */
	token = strsep(&b, " ");
	if (!token)
		return -EINVAL;
	if (!strcmp(token, "config_pin"))
		dbg->map_type = PIN_MAP_TYPE_CONFIGS_PIN;
	else if (!strcmp(token, "config_group"))
		dbg->map_type = PIN_MAP_TYPE_CONFIGS_GROUP;
	else
		return -EINVAL;

	/* get arg 'device_name' */
	token = strsep(&b, " ");
	if (!token)
		return -EINVAL;
	if (strlen(token) >= MAX_NAME_LEN)
		return -EINVAL;
	strncpy(dbg->dev_name, token, MAX_NAME_LEN);

	/* get arg 'state_name' */
	token = strsep(&b, " ");
	if (!token)
		return -EINVAL;
	if (strlen(token) >= MAX_NAME_LEN)
		return -EINVAL;
	strncpy(dbg->state_name, token, MAX_NAME_LEN);

	/* get arg 'pin_name' */
	token = strsep(&b, " ");
	if (!token)
		return -EINVAL;
	if (strlen(token) >= MAX_NAME_LEN)
		return -EINVAL;
	strncpy(dbg->pin_name, token, MAX_NAME_LEN);

	/* get new_value of config' */
	token = strsep(&b, " ");
	if (!token)
		return -EINVAL;
	if (strlen(token) >= MAX_NAME_LEN)
		return -EINVAL;
	strncpy(config, token, MAX_NAME_LEN);

	mutex_lock(&pinctrl_maps_mutex);

	/* Parse the pinctrl map and look for the selected dev/state/pin */
	for_each_maps(maps_node, i, map) {
		if (strcmp(map->dev_name, dbg->dev_name))
			continue;
		if (map->type != dbg->map_type)
			continue;
		if (strcmp(map->name, dbg->state_name))
			continue;

		/*  we found the right pin / state, so overwrite config */
		if (!strcmp(map->data.configs.group_or_pin, dbg->pin_name)) {
			found = map;
			break;
		}
	}

	if (!found) {
		count = -EINVAL;
		goto exit;
	}

	pctldev = get_pinctrl_dev_from_devname(found->ctrl_dev_name);
	if (pctldev)
		confops = pctldev->desc->confops;

	if (confops && confops->pin_config_dbg_parse_modify) {
		configs = &found->data.configs;
		for (i = 0; i < configs->num_configs; i++) {
			confops->pin_config_dbg_parse_modify(pctldev,
						     config,
						     &configs->configs[i]);
		}
	}

exit:
	mutex_unlock(&pinctrl_maps_mutex);

	return count;
}

static int pinconf_dbg_config_open(struct inode *inode, struct file *file)
{
	return single_open(file, pinconf_dbg_config_print, inode->i_private);
}

static const struct file_operations pinconf_dbg_pinconfig_fops = {
	.open = pinconf_dbg_config_open,
	.write = pinconf_dbg_config_write,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
};

void pinconf_init_device_debugfs(struct dentry *devroot,
			 struct pinctrl_dev *pctldev)
{
	debugfs_create_file("pinconf-pins", S_IFREG | S_IRUGO,
			    devroot, pctldev, &pinconf_pins_ops);
	debugfs_create_file("pinconf-groups", S_IFREG | S_IRUGO,
			    devroot, pctldev, &pinconf_groups_ops);
	debugfs_create_file("pinconf-config",  (S_IRUGO | S_IWUSR | S_IWGRP),
			    devroot, pctldev, &pinconf_dbg_pinconfig_fops);
}

#endif
Commit	Line	Data
ae6b4d85 LW	1	/*
	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>
f07512e6	20	#include <linux/uaccess.h>
ae6b4d85 LW	21	#include <linux/pinctrl/machine.h>
	22	#include <linux/pinctrl/pinctrl.h>
	23	#include <linux/pinctrl/pinconf.h>
	24	#include "core.h"
	25	#include "pinconf.h"
	26
2b694250 SW	27	int pinconf_check_ops(struct pinctrl_dev *pctldev)
	28	{
	29	const struct pinconf_ops *ops = pctldev->desc->confops;
	30
2b694250	31	/* We have to be able to config the pins in SOME way */
ad6e1107 JC	32	if (!ops->pin_config_set && !ops->pin_config_group_set) {
	33	dev_err(pctldev->dev,
	34	"pinconf has to be able to set a pins config\n");
2b694250	35	return -EINVAL;
ad6e1107	36	}
2b694250 SW	37	return 0;
	38	}
	39
1e2082b5 SW	40	int pinconf_validate_map(struct pinctrl_map const *map, int i)
	41	{
	42	if (!map->data.configs.group_or_pin) {
	43	pr_err("failed to register map %s (%d): no group/pin given\n",
	44	map->name, i);
	45	return -EINVAL;
	46	}
	47
c95df2db	48	if (!map->data.configs.num_configs \|\|
1e2082b5	49	!map->data.configs.configs) {
c95df2db	50	pr_err("failed to register map %s (%d): no configs given\n",
1e2082b5 SW	51	map->name, i);
	52	return -EINVAL;
	53	}
	54
	55	return 0;
	56	}
	57
394349f7	58	int pin_config_get_for_pin(struct pinctrl_dev *pctldev, unsigned pin,
ae6b4d85 LW	59	unsigned long *config)
	60	{
	61	const struct pinconf_ops *ops = pctldev->desc->confops;
	62
	63	if (!ops \|\| !ops->pin_config_get) {
ca67f10f MY	64	dev_dbg(pctldev->dev,
ca67f10f MY	65	"cannot get pin configuration, .pin_config_get missing in driver\n");
c420619d	66	return -ENOTSUPP;
ae6b4d85 LW	67	}
	68
	69	return ops->pin_config_get(pctldev, pin, config);
	70	}
	71
43699dea	72	int pin_config_group_get(const char dev_name, const char pin_group,
ae6b4d85 LW	73	unsigned long *config)
ae6b4d85 LW	74	{
43699dea SW	75	struct pinctrl_dev *pctldev;
43699dea SW	76	const struct pinconf_ops *ops;
57b676f9 SW	77	int selector, ret;
57b676f9 SW	78
9dfac4fd	79	pctldev = get_pinctrl_dev_from_devname(dev_name);
57b676f9 SW	80	if (!pctldev) {
57b676f9 SW	81	ret = -EINVAL;
42fed7ba	82	return ret;
57b676f9	83	}
42fed7ba PC	84
	85	mutex_lock(&pctldev->mutex);
	86
43699dea SW	87	ops = pctldev->desc->confops;
43699dea SW	88
ae6b4d85	89	if (!ops \|\| !ops->pin_config_group_get) {
e4d03050 ME	90	dev_dbg(pctldev->dev,
e4d03050 ME	91	"cannot get configuration for pin group, missing group config get function in driver\n");
c420619d	92	ret = -ENOTSUPP;
57b676f9	93	goto unlock;
ae6b4d85 LW	94	}
	95
	96	selector = pinctrl_get_group_selector(pctldev, pin_group);
57b676f9 SW	97	if (selector < 0) {
	98	ret = selector;
	99	goto unlock;
	100	}
ae6b4d85	101
57b676f9 SW	102	ret = ops->pin_config_group_get(pctldev, selector, config);
	103
	104	unlock:
42fed7ba	105	mutex_unlock(&pctldev->mutex);
57b676f9	106	return ret;
ae6b4d85	107	}
ae6b4d85	108
1e2082b5 SW	109	int pinconf_map_to_setting(struct pinctrl_map const *map,
	110	struct pinctrl_setting *setting)
	111	{
	112	struct pinctrl_dev *pctldev = setting->pctldev;
70b36378	113	int pin;
1e2082b5 SW	114
	115	switch (setting->type) {
	116	case PIN_MAP_TYPE_CONFIGS_PIN:
70b36378 LW	117	pin = pin_get_from_name(pctldev,
	118	map->data.configs.group_or_pin);
	119	if (pin < 0) {
	120	dev_err(pctldev->dev, "could not map pin config for \"%s\"",
	121	map->data.configs.group_or_pin);
	122	return pin;
	123	}
	124	setting->data.configs.group_or_pin = pin;
1e2082b5 SW	125	break;
1e2082b5 SW	126	case PIN_MAP_TYPE_CONFIGS_GROUP:
70b36378 LW	127	pin = pinctrl_get_group_selector(pctldev,
	128	map->data.configs.group_or_pin);
	129	if (pin < 0) {
	130	dev_err(pctldev->dev, "could not map group config for \"%s\"",
	131	map->data.configs.group_or_pin);
	132	return pin;
	133	}
	134	setting->data.configs.group_or_pin = pin;
1e2082b5 SW	135	break;
	136	default:
	137	return -EINVAL;
	138	}
	139
	140	setting->data.configs.num_configs = map->data.configs.num_configs;
	141	setting->data.configs.configs = map->data.configs.configs;
	142
	143	return 0;
	144	}
	145
	146	void pinconf_free_setting(struct pinctrl_setting const *setting)
	147	{
	148	}
	149
	150	int pinconf_apply_setting(struct pinctrl_setting const *setting)
	151	{
	152	struct pinctrl_dev *pctldev = setting->pctldev;
	153	const struct pinconf_ops *ops = pctldev->desc->confops;
03b054e9	154	int ret;
1e2082b5 SW	155
	156	if (!ops) {
	157	dev_err(pctldev->dev, "missing confops\n");
	158	return -EINVAL;
	159	}
	160
	161	switch (setting->type) {
	162	case PIN_MAP_TYPE_CONFIGS_PIN:
	163	if (!ops->pin_config_set) {
	164	dev_err(pctldev->dev, "missing pin_config_set op\n");
	165	return -EINVAL;
	166	}
03b054e9 SY	167	ret = ops->pin_config_set(pctldev,
	168	setting->data.configs.group_or_pin,
	169	setting->data.configs.configs,
	170	setting->data.configs.num_configs);
	171	if (ret < 0) {
	172	dev_err(pctldev->dev,
	173	"pin_config_set op failed for pin %d\n",
	174	setting->data.configs.group_or_pin);
	175	return ret;
1e2082b5 SW	176	}
	177	break;
	178	case PIN_MAP_TYPE_CONFIGS_GROUP:
	179	if (!ops->pin_config_group_set) {
	180	dev_err(pctldev->dev,
	181	"missing pin_config_group_set op\n");
	182	return -EINVAL;
	183	}
03b054e9 SY	184	ret = ops->pin_config_group_set(pctldev,
	185	setting->data.configs.group_or_pin,
	186	setting->data.configs.configs,
	187	setting->data.configs.num_configs);
	188	if (ret < 0) {
	189	dev_err(pctldev->dev,
	190	"pin_config_group_set op failed for group %d\n",
	191	setting->data.configs.group_or_pin);
	192	return ret;
1e2082b5 SW	193	}
	194	break;
	195	default:
	196	return -EINVAL;
	197	}
	198
	199	return 0;
	200	}
	201
15381bc7 MW	202	int pinconf_set_config(struct pinctrl_dev *pctldev, unsigned pin,
	203	unsigned long *configs, size_t nconfigs)
	204	{
	205	const struct pinconf_ops *ops;
	206
	207	ops = pctldev->desc->confops;
	208	if (!ops)
	209	return -ENOTSUPP;
	210
	211	return ops->pin_config_set(pctldev, pin, configs, nconfigs);
	212	}
	213
ae6b4d85 LW	214	#ifdef CONFIG_DEBUG_FS
ae6b4d85 LW	215
6de52c15	216	static void pinconf_show_config(struct seq_file s, struct pinctrl_dev pctldev,
d96310ae	217	unsigned long *configs, unsigned num_configs)
1e2082b5	218	{
6cb41587	219	const struct pinconf_ops *confops;
1e2082b5 SW	220	int i;
1e2082b5 SW	221
6cb41587 SW	222	if (pctldev)
	223	confops = pctldev->desc->confops;
	224	else
	225	confops = NULL;
	226
d96310ae JH	227	for (i = 0; i < num_configs; i++) {
	228	seq_puts(s, "config ");
	229	if (confops && confops->pin_config_config_dbg_show)
	230	confops->pin_config_config_dbg_show(pctldev, s,
	231	configs[i]);
	232	else
	233	seq_printf(s, "%08lx", configs[i]);
47352a63	234	seq_putc(s, '\n');
d96310ae JH	235	}
	236	}
	237
	238	void pinconf_show_map(struct seq_file s, struct pinctrl_map const map)
	239	{
	240	struct pinctrl_dev *pctldev;
	241
	242	pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name);
	243
1e2082b5 SW	244	switch (map->type) {
1e2082b5 SW	245	case PIN_MAP_TYPE_CONFIGS_PIN:
de2eae26	246	seq_puts(s, "pin ");
1e2082b5 SW	247	break;
1e2082b5 SW	248	case PIN_MAP_TYPE_CONFIGS_GROUP:
de2eae26	249	seq_puts(s, "group ");
1e2082b5 SW	250	break;
	251	default:
	252	break;
	253	}
	254
	255	seq_printf(s, "%s\n", map->data.configs.group_or_pin);
	256
d96310ae JH	257	pinconf_show_config(s, pctldev, map->data.configs.configs,
d96310ae JH	258	map->data.configs.num_configs);
1e2082b5 SW	259	}
	260
	261	void pinconf_show_setting(struct seq_file *s,
	262	struct pinctrl_setting const *setting)
	263	{
	264	struct pinctrl_dev *pctldev = setting->pctldev;
	265	const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
	266	struct pin_desc *desc;
1e2082b5 SW	267
	268	switch (setting->type) {
	269	case PIN_MAP_TYPE_CONFIGS_PIN:
	270	desc = pin_desc_get(setting->pctldev,
	271	setting->data.configs.group_or_pin);
cf9d994d	272	seq_printf(s, "pin %s (%d)", desc->name,
1e2082b5 SW	273	setting->data.configs.group_or_pin);
	274	break;
	275	case PIN_MAP_TYPE_CONFIGS_GROUP:
	276	seq_printf(s, "group %s (%d)",
	277	pctlops->get_group_name(pctldev,
	278	setting->data.configs.group_or_pin),
	279	setting->data.configs.group_or_pin);
	280	break;
	281	default:
	282	break;
	283	}
	284
	285	/*
3ec440e3	286	* FIXME: We should really get the pin controller to dump the config
1e2082b5 SW	287	* values, so they can be decoded to something meaningful.
1e2082b5 SW	288	*/
d96310ae JH	289	pinconf_show_config(s, pctldev, setting->data.configs.configs,
d96310ae JH	290	setting->data.configs.num_configs);
1e2082b5 SW	291	}
1e2082b5 SW	292
ae6b4d85 LW	293	static void pinconf_dump_pin(struct pinctrl_dev *pctldev,
	294	struct seq_file *s, int pin)
	295	{
	296	const struct pinconf_ops *ops = pctldev->desc->confops;
	297
394349f7	298	/* no-op when not using generic pin config */
dd4d01f7	299	pinconf_generic_dump_pins(pctldev, s, NULL, pin);
ae6b4d85 LW	300	if (ops && ops->pin_config_dbg_show)
	301	ops->pin_config_dbg_show(pctldev, s, pin);
	302	}
	303
	304	static int pinconf_pins_show(struct seq_file s, void what)
	305	{
	306	struct pinctrl_dev *pctldev = s->private;
706e8520	307	unsigned i, pin;
ae6b4d85 LW	308
ae6b4d85 LW	309	seq_puts(s, "Pin config settings per pin\n");
2aeefe02	310	seq_puts(s, "Format: pin (name): configs\n");
ae6b4d85	311
42fed7ba	312	mutex_lock(&pctldev->mutex);
57b676f9	313
706e8520	314	/* The pin number can be retrived from the pin controller descriptor */
546edd83	315	for (i = 0; i < pctldev->desc->npins; i++) {
ae6b4d85 LW	316	struct pin_desc *desc;
ae6b4d85 LW	317
706e8520	318	pin = pctldev->desc->pins[i].number;
ae6b4d85	319	desc = pin_desc_get(pctldev, pin);
706e8520	320	/* Skip if we cannot search the pin */
76ce37f0	321	if (!desc)
ae6b4d85 LW	322	continue;
ae6b4d85 LW	323
a672eb5e	324	seq_printf(s, "pin %d (%s): ", pin, desc->name);
ae6b4d85 LW	325
ae6b4d85 LW	326	pinconf_dump_pin(pctldev, s, pin);
47352a63	327	seq_putc(s, '\n');
ae6b4d85 LW	328	}
ae6b4d85 LW	329
42fed7ba	330	mutex_unlock(&pctldev->mutex);
57b676f9	331
ae6b4d85 LW	332	return 0;
	333	}
	334
	335	static void pinconf_dump_group(struct pinctrl_dev *pctldev,
	336	struct seq_file *s, unsigned selector,
	337	const char *gname)
	338	{
	339	const struct pinconf_ops *ops = pctldev->desc->confops;
	340
394349f7	341	/* no-op when not using generic pin config */
dd4d01f7	342	pinconf_generic_dump_pins(pctldev, s, gname, 0);
ae6b4d85 LW	343	if (ops && ops->pin_config_group_dbg_show)
	344	ops->pin_config_group_dbg_show(pctldev, s, selector);
	345	}
	346
	347	static int pinconf_groups_show(struct seq_file s, void what)
	348	{
	349	struct pinctrl_dev *pctldev = s->private;
	350	const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
d1e90e9e	351	unsigned ngroups = pctlops->get_groups_count(pctldev);
ae6b4d85 LW	352	unsigned selector = 0;
ae6b4d85 LW	353
ae6b4d85	354	seq_puts(s, "Pin config settings per pin group\n");
2aeefe02	355	seq_puts(s, "Format: group (name): configs\n");
ae6b4d85	356
d1e90e9e	357	while (selector < ngroups) {
ae6b4d85 LW	358	const char *gname = pctlops->get_group_name(pctldev, selector);
ae6b4d85 LW	359
a672eb5e	360	seq_printf(s, "%u (%s): ", selector, gname);
ae6b4d85	361	pinconf_dump_group(pctldev, s, selector, gname);
47352a63	362	seq_putc(s, '\n');
ae6b4d85 LW	363	selector++;
	364	}
	365
	366	return 0;
	367	}
	368
	369	static int pinconf_pins_open(struct inode inode, struct file file)
	370	{
	371	return single_open(file, pinconf_pins_show, inode->i_private);
	372	}
	373
	374	static int pinconf_groups_open(struct inode inode, struct file file)
	375	{
	376	return single_open(file, pinconf_groups_show, inode->i_private);
	377	}
	378
	379	static const struct file_operations pinconf_pins_ops = {
	380	.open = pinconf_pins_open,
	381	.read = seq_read,
	382	.llseek = seq_lseek,
	383	.release = single_release,
	384	};
	385
	386	static const struct file_operations pinconf_groups_ops = {
	387	.open = pinconf_groups_open,
	388	.read = seq_read,
	389	.llseek = seq_lseek,
	390	.release = single_release,
	391	};
	392
f07512e6 LM	393	#define MAX_NAME_LEN 15
	394
	395	struct dbg_cfg {
	396	enum pinctrl_map_type map_type;
e8c5d759 ME	397	char dev_name[MAX_NAME_LEN + 1];
	398	char state_name[MAX_NAME_LEN + 1];
	399	char pin_name[MAX_NAME_LEN + 1];
f07512e6 LM	400	};
	401
	402	/*
	403	* Goal is to keep this structure as global in order to simply read the
	404	* pinconf-config file after a write to check config is as expected
	405	*/
	406	static struct dbg_cfg pinconf_dbg_conf;
	407
	408	/**
	409	* pinconf_dbg_config_print() - display the pinctrl config from the pinctrl
	410	* map, of the dev/pin/state that was last written to pinconf-config file.
	411	* @s: string filled in with config description
	412	* @d: not used
	413	*/
	414	static int pinconf_dbg_config_print(struct seq_file s, void d)
	415	{
	416	struct pinctrl_maps *maps_node;
	417	const struct pinctrl_map *map;
8a9dcc3f RKAL	418	const struct pinctrl_map *found = NULL;
8a9dcc3f RKAL	419	struct pinctrl_dev *pctldev;
f07512e6	420	struct dbg_cfg *dbg = &pinconf_dbg_conf;
d99c8053	421	int i;
f07512e6	422
a386267a	423	mutex_lock(&pinctrl_maps_mutex);
f07512e6 LM	424
	425	/* Parse the pinctrl map and look for the elected pin/state */
	426	for_each_maps(maps_node, i, map) {
	427	if (map->type != dbg->map_type)
	428	continue;
	429	if (strcmp(map->dev_name, dbg->dev_name))
	430	continue;
	431	if (strcmp(map->name, dbg->state_name))
	432	continue;
	433
d99c8053 LM	434	if (!strcmp(map->data.configs.group_or_pin, dbg->pin_name)) {
	435	/* We found the right pin */
	436	found = map;
	437	break;
f07512e6 LM	438	}
	439	}
	440
	441	if (!found) {
	442	seq_printf(s, "No config found for dev/state/pin, expected:\n");
	443	seq_printf(s, "Searched dev:%s\n", dbg->dev_name);
	444	seq_printf(s, "Searched state:%s\n", dbg->state_name);
	445	seq_printf(s, "Searched pin:%s\n", dbg->pin_name);
	446	seq_printf(s, "Use: modify config_pin <devname> "\
	447	"<state> <pinname> <value>\n");
	448	goto exit;
	449	}
	450
8a9dcc3f	451	pctldev = get_pinctrl_dev_from_devname(found->ctrl_dev_name);
d96310ae JH	452	seq_printf(s, "Dev %s has config of %s in state %s:\n",
	453	dbg->dev_name, dbg->pin_name, dbg->state_name);
	454	pinconf_show_config(s, pctldev, found->data.configs.configs,
	455	found->data.configs.num_configs);
f07512e6 LM	456
f07512e6 LM	457	exit:
a386267a	458	mutex_unlock(&pinctrl_maps_mutex);
f07512e6 LM	459
	460	return 0;
	461	}
	462
	463	/**
	464	* pinconf_dbg_config_write() - modify the pinctrl config in the pinctrl
	465	* map, of a dev/pin/state entry based on user entries to pinconf-config
	466	* @user_buf: contains the modification request with expected format:
75629981	467	* modify <config> <devicename> <state> <name> <newvalue>
f07512e6	468	* modify is literal string, alternatives like add/delete not supported yet
75629981 JH	469	* <config> is the configuration to be changed. Supported configs are
	470	* "config_pin" or "config_group", alternatives like config_mux are not
	471	* supported yet.
	472	* <devicename> <state> <name> are values that should match the pinctrl-maps
3ec440e3	473	* <newvalue> reflects the new config and is driver dependent
f07512e6	474	*/
3b59e432	475	static ssize_t pinconf_dbg_config_write(struct file *file,
f07512e6 LM	476	const char __user user_buf, size_t count, loff_t ppos)
	477	{
	478	struct pinctrl_maps *maps_node;
	479	const struct pinctrl_map *map;
8a9dcc3f RKAL	480	const struct pinctrl_map *found = NULL;
8a9dcc3f RKAL	481	struct pinctrl_dev *pctldev;
f07512e6 LM	482	const struct pinconf_ops *confops = NULL;
	483	struct dbg_cfg *dbg = &pinconf_dbg_conf;
	484	const struct pinctrl_map_configs *configs;
e8c5d759	485	char config[MAX_NAME_LEN + 1];
f07512e6 LM	486	char buf[128];
	487	char *b = &buf[0];
	488	int buf_size;
	489	char *token;
	490	int i;
	491
	492	/* Get userspace string and assure termination */
81d36c4f	493	buf_size = min(count, sizeof(buf) - 1);
f07512e6 LM	494	if (copy_from_user(buf, user_buf, buf_size))
	495	return -EFAULT;
	496	buf[buf_size] = 0;
	497
	498	/*
	499	* need to parse entry and extract parameters:
	500	* modify configs_pin devicename state pinname newvalue
	501	*/
	502
	503	/* Get arg: 'modify' */
	504	token = strsep(&b, " ");
	505	if (!token)
	506	return -EINVAL;
	507	if (strcmp(token, "modify"))
	508	return -EINVAL;
	509
75629981 JH	510	/*
	511	* Get arg type: "config_pin" and "config_group"
	512	* types are supported so far
	513	*/
f07512e6 LM	514	token = strsep(&b, " ");
	515	if (!token)
	516	return -EINVAL;
75629981 JH	517	if (!strcmp(token, "config_pin"))
	518	dbg->map_type = PIN_MAP_TYPE_CONFIGS_PIN;
	519	else if (!strcmp(token, "config_group"))
	520	dbg->map_type = PIN_MAP_TYPE_CONFIGS_GROUP;
	521	else
f07512e6	522	return -EINVAL;
f07512e6 LM	523
	524	/* get arg 'device_name' */
	525	token = strsep(&b, " ");
76ce37f0	526	if (!token)
f07512e6 LM	527	return -EINVAL;
	528	if (strlen(token) >= MAX_NAME_LEN)
	529	return -EINVAL;
	530	strncpy(dbg->dev_name, token, MAX_NAME_LEN);
	531
	532	/* get arg 'state_name' */
	533	token = strsep(&b, " ");
76ce37f0	534	if (!token)
f07512e6 LM	535	return -EINVAL;
	536	if (strlen(token) >= MAX_NAME_LEN)
	537	return -EINVAL;
	538	strncpy(dbg->state_name, token, MAX_NAME_LEN);
	539
	540	/* get arg 'pin_name' */
	541	token = strsep(&b, " ");
76ce37f0	542	if (!token)
f07512e6 LM	543	return -EINVAL;
	544	if (strlen(token) >= MAX_NAME_LEN)
	545	return -EINVAL;
	546	strncpy(dbg->pin_name, token, MAX_NAME_LEN);
	547
	548	/* get new_value of config' */
	549	token = strsep(&b, " ");
76ce37f0	550	if (!token)
f07512e6 LM	551	return -EINVAL;
	552	if (strlen(token) >= MAX_NAME_LEN)
	553	return -EINVAL;
	554	strncpy(config, token, MAX_NAME_LEN);
	555
42fed7ba	556	mutex_lock(&pinctrl_maps_mutex);
f07512e6 LM	557
	558	/* Parse the pinctrl map and look for the selected dev/state/pin */
	559	for_each_maps(maps_node, i, map) {
	560	if (strcmp(map->dev_name, dbg->dev_name))
	561	continue;
	562	if (map->type != dbg->map_type)
	563	continue;
	564	if (strcmp(map->name, dbg->state_name))
	565	continue;
	566
	567	/* we found the right pin / state, so overwrite config */
	568	if (!strcmp(map->data.configs.group_or_pin, dbg->pin_name)) {
8a9dcc3f	569	found = map;
f07512e6 LM	570	break;
	571	}
	572	}
	573
	574	if (!found) {
f07512e6	575	count = -EINVAL;
cb6d315d	576	goto exit;
f07512e6 LM	577	}
f07512e6 LM	578
8a9dcc3f	579	pctldev = get_pinctrl_dev_from_devname(found->ctrl_dev_name);
f07512e6 LM	580	if (pctldev)
	581	confops = pctldev->desc->confops;
	582
	583	if (confops && confops->pin_config_dbg_parse_modify) {
8a9dcc3f	584	configs = &found->data.configs;
f07512e6 LM	585	for (i = 0; i < configs->num_configs; i++) {
	586	confops->pin_config_dbg_parse_modify(pctldev,
	587	config,
	588	&configs->configs[i]);
	589	}
	590	}
	591
	592	exit:
42fed7ba	593	mutex_unlock(&pinctrl_maps_mutex);
f07512e6 LM	594
	595	return count;
	596	}
	597
	598	static int pinconf_dbg_config_open(struct inode inode, struct file file)
	599	{
	600	return single_open(file, pinconf_dbg_config_print, inode->i_private);
	601	}
	602
	603	static const struct file_operations pinconf_dbg_pinconfig_fops = {
	604	.open = pinconf_dbg_config_open,
	605	.write = pinconf_dbg_config_write,
	606	.read = seq_read,
	607	.llseek = seq_lseek,
	608	.release = single_release,
	609	.owner = THIS_MODULE,
	610	};
	611
ae6b4d85 LW	612	void pinconf_init_device_debugfs(struct dentry *devroot,
	613	struct pinctrl_dev *pctldev)
	614	{
	615	debugfs_create_file("pinconf-pins", S_IFREG \| S_IRUGO,
	616	devroot, pctldev, &pinconf_pins_ops);
	617	debugfs_create_file("pinconf-groups", S_IFREG \| S_IRUGO,
	618	devroot, pctldev, &pinconf_groups_ops);
f07512e6 LM	619	debugfs_create_file("pinconf-config", (S_IRUGO \| S_IWUSR \| S_IWGRP),
f07512e6 LM	620	devroot, pctldev, &pinconf_dbg_pinconfig_fops);
ae6b4d85 LW	621	}
	622
	623	#endif