[mirror_ubuntu-artful-kernel.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;
}

#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_puts(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_printf(s, "pin ");
		break;
	case PIN_MAP_TYPE_CONFIGS_GROUP:
		seq_printf(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 controler 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 == NULL)
			continue;

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

		pinconf_dump_pin(pctldev, s, pin);

		seq_printf(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_printf(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 dependant
 */
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 == NULL)
		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 == NULL)
		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 == NULL)
		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 == NULL)
		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) {
c420619d	90	dev_dbg(pctldev->dev, "cannot get configuration for pin "
ae6b4d85 LW	91	"group, missing group config get function in "
ae6b4d85 LW	92	"driver\n");
c420619d	93	ret = -ENOTSUPP;
57b676f9	94	goto unlock;
ae6b4d85 LW	95	}
	96
	97	selector = pinctrl_get_group_selector(pctldev, pin_group);
57b676f9 SW	98	if (selector < 0) {
	99	ret = selector;
	100	goto unlock;
	101	}
ae6b4d85	102
57b676f9 SW	103	ret = ops->pin_config_group_get(pctldev, selector, config);
	104
	105	unlock:
42fed7ba	106	mutex_unlock(&pctldev->mutex);
57b676f9	107	return ret;
ae6b4d85	108	}
ae6b4d85	109
1e2082b5 SW	110	int pinconf_map_to_setting(struct pinctrl_map const *map,
	111	struct pinctrl_setting *setting)
	112	{
	113	struct pinctrl_dev *pctldev = setting->pctldev;
70b36378	114	int pin;
1e2082b5 SW	115
	116	switch (setting->type) {
	117	case PIN_MAP_TYPE_CONFIGS_PIN:
70b36378 LW	118	pin = pin_get_from_name(pctldev,
	119	map->data.configs.group_or_pin);
	120	if (pin < 0) {
	121	dev_err(pctldev->dev, "could not map pin config for \"%s\"",
	122	map->data.configs.group_or_pin);
	123	return pin;
	124	}
	125	setting->data.configs.group_or_pin = pin;
1e2082b5 SW	126	break;
1e2082b5 SW	127	case PIN_MAP_TYPE_CONFIGS_GROUP:
70b36378 LW	128	pin = pinctrl_get_group_selector(pctldev,
	129	map->data.configs.group_or_pin);
	130	if (pin < 0) {
	131	dev_err(pctldev->dev, "could not map group config for \"%s\"",
	132	map->data.configs.group_or_pin);
	133	return pin;
	134	}
	135	setting->data.configs.group_or_pin = pin;
1e2082b5 SW	136	break;
	137	default:
	138	return -EINVAL;
	139	}
	140
	141	setting->data.configs.num_configs = map->data.configs.num_configs;
	142	setting->data.configs.configs = map->data.configs.configs;
	143
	144	return 0;
	145	}
	146
	147	void pinconf_free_setting(struct pinctrl_setting const *setting)
	148	{
	149	}
	150
	151	int pinconf_apply_setting(struct pinctrl_setting const *setting)
	152	{
	153	struct pinctrl_dev *pctldev = setting->pctldev;
	154	const struct pinconf_ops *ops = pctldev->desc->confops;
03b054e9	155	int ret;
1e2082b5 SW	156
	157	if (!ops) {
	158	dev_err(pctldev->dev, "missing confops\n");
	159	return -EINVAL;
	160	}
	161
	162	switch (setting->type) {
	163	case PIN_MAP_TYPE_CONFIGS_PIN:
	164	if (!ops->pin_config_set) {
	165	dev_err(pctldev->dev, "missing pin_config_set op\n");
	166	return -EINVAL;
	167	}
03b054e9 SY	168	ret = ops->pin_config_set(pctldev,
	169	setting->data.configs.group_or_pin,
	170	setting->data.configs.configs,
	171	setting->data.configs.num_configs);
	172	if (ret < 0) {
	173	dev_err(pctldev->dev,
	174	"pin_config_set op failed for pin %d\n",
	175	setting->data.configs.group_or_pin);
	176	return ret;
1e2082b5 SW	177	}
	178	break;
	179	case PIN_MAP_TYPE_CONFIGS_GROUP:
	180	if (!ops->pin_config_group_set) {
	181	dev_err(pctldev->dev,
	182	"missing pin_config_group_set op\n");
	183	return -EINVAL;
	184	}
03b054e9 SY	185	ret = ops->pin_config_group_set(pctldev,
	186	setting->data.configs.group_or_pin,
	187	setting->data.configs.configs,
	188	setting->data.configs.num_configs);
	189	if (ret < 0) {
	190	dev_err(pctldev->dev,
	191	"pin_config_group_set op failed for group %d\n",
	192	setting->data.configs.group_or_pin);
	193	return ret;
1e2082b5 SW	194	}
	195	break;
	196	default:
	197	return -EINVAL;
	198	}
	199
	200	return 0;
	201	}
	202
ae6b4d85 LW	203	#ifdef CONFIG_DEBUG_FS
ae6b4d85 LW	204
6de52c15	205	static void pinconf_show_config(struct seq_file s, struct pinctrl_dev pctldev,
d96310ae	206	unsigned long *configs, unsigned num_configs)
1e2082b5	207	{
6cb41587	208	const struct pinconf_ops *confops;
1e2082b5 SW	209	int i;
1e2082b5 SW	210
6cb41587 SW	211	if (pctldev)
	212	confops = pctldev->desc->confops;
	213	else
	214	confops = NULL;
	215
d96310ae JH	216	for (i = 0; i < num_configs; i++) {
	217	seq_puts(s, "config ");
	218	if (confops && confops->pin_config_config_dbg_show)
	219	confops->pin_config_config_dbg_show(pctldev, s,
	220	configs[i]);
	221	else
	222	seq_printf(s, "%08lx", configs[i]);
	223	seq_puts(s, "\n");
	224	}
	225	}
	226
	227	void pinconf_show_map(struct seq_file s, struct pinctrl_map const map)
	228	{
	229	struct pinctrl_dev *pctldev;
	230
	231	pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name);
	232
1e2082b5 SW	233	switch (map->type) {
	234	case PIN_MAP_TYPE_CONFIGS_PIN:
	235	seq_printf(s, "pin ");
	236	break;
	237	case PIN_MAP_TYPE_CONFIGS_GROUP:
	238	seq_printf(s, "group ");
	239	break;
	240	default:
	241	break;
	242	}
	243
	244	seq_printf(s, "%s\n", map->data.configs.group_or_pin);
	245
d96310ae JH	246	pinconf_show_config(s, pctldev, map->data.configs.configs,
d96310ae JH	247	map->data.configs.num_configs);
1e2082b5 SW	248	}
	249
	250	void pinconf_show_setting(struct seq_file *s,
	251	struct pinctrl_setting const *setting)
	252	{
	253	struct pinctrl_dev *pctldev = setting->pctldev;
	254	const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
	255	struct pin_desc *desc;
1e2082b5 SW	256
	257	switch (setting->type) {
	258	case PIN_MAP_TYPE_CONFIGS_PIN:
	259	desc = pin_desc_get(setting->pctldev,
	260	setting->data.configs.group_or_pin);
cf9d994d	261	seq_printf(s, "pin %s (%d)", desc->name,
1e2082b5 SW	262	setting->data.configs.group_or_pin);
	263	break;
	264	case PIN_MAP_TYPE_CONFIGS_GROUP:
	265	seq_printf(s, "group %s (%d)",
	266	pctlops->get_group_name(pctldev,
	267	setting->data.configs.group_or_pin),
	268	setting->data.configs.group_or_pin);
	269	break;
	270	default:
	271	break;
	272	}
	273
	274	/*
	275	* FIXME: We should really get the pin controler to dump the config
	276	* values, so they can be decoded to something meaningful.
	277	*/
d96310ae JH	278	pinconf_show_config(s, pctldev, setting->data.configs.configs,
d96310ae JH	279	setting->data.configs.num_configs);
1e2082b5 SW	280	}
1e2082b5 SW	281
ae6b4d85 LW	282	static void pinconf_dump_pin(struct pinctrl_dev *pctldev,
	283	struct seq_file *s, int pin)
	284	{
	285	const struct pinconf_ops *ops = pctldev->desc->confops;
	286
394349f7	287	/* no-op when not using generic pin config */
dd4d01f7	288	pinconf_generic_dump_pins(pctldev, s, NULL, pin);
ae6b4d85 LW	289	if (ops && ops->pin_config_dbg_show)
	290	ops->pin_config_dbg_show(pctldev, s, pin);
	291	}
	292
	293	static int pinconf_pins_show(struct seq_file s, void what)
	294	{
	295	struct pinctrl_dev *pctldev = s->private;
706e8520	296	unsigned i, pin;
ae6b4d85 LW	297
ae6b4d85 LW	298	seq_puts(s, "Pin config settings per pin\n");
2aeefe02	299	seq_puts(s, "Format: pin (name): configs\n");
ae6b4d85	300
42fed7ba	301	mutex_lock(&pctldev->mutex);
57b676f9	302
706e8520	303	/* The pin number can be retrived from the pin controller descriptor */
546edd83	304	for (i = 0; i < pctldev->desc->npins; i++) {
ae6b4d85 LW	305	struct pin_desc *desc;
ae6b4d85 LW	306
706e8520	307	pin = pctldev->desc->pins[i].number;
ae6b4d85	308	desc = pin_desc_get(pctldev, pin);
706e8520	309	/* Skip if we cannot search the pin */
ae6b4d85 LW	310	if (desc == NULL)
	311	continue;
	312
a672eb5e	313	seq_printf(s, "pin %d (%s): ", pin, desc->name);
ae6b4d85 LW	314
	315	pinconf_dump_pin(pctldev, s, pin);
	316
	317	seq_printf(s, "\n");
	318	}
	319
42fed7ba	320	mutex_unlock(&pctldev->mutex);
57b676f9	321
ae6b4d85 LW	322	return 0;
	323	}
	324
	325	static void pinconf_dump_group(struct pinctrl_dev *pctldev,
	326	struct seq_file *s, unsigned selector,
	327	const char *gname)
	328	{
	329	const struct pinconf_ops *ops = pctldev->desc->confops;
	330
394349f7	331	/* no-op when not using generic pin config */
dd4d01f7	332	pinconf_generic_dump_pins(pctldev, s, gname, 0);
ae6b4d85 LW	333	if (ops && ops->pin_config_group_dbg_show)
	334	ops->pin_config_group_dbg_show(pctldev, s, selector);
	335	}
	336
	337	static int pinconf_groups_show(struct seq_file s, void what)
	338	{
	339	struct pinctrl_dev *pctldev = s->private;
	340	const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
d1e90e9e	341	unsigned ngroups = pctlops->get_groups_count(pctldev);
ae6b4d85 LW	342	unsigned selector = 0;
ae6b4d85 LW	343
ae6b4d85	344	seq_puts(s, "Pin config settings per pin group\n");
2aeefe02	345	seq_puts(s, "Format: group (name): configs\n");
ae6b4d85	346
d1e90e9e	347	while (selector < ngroups) {
ae6b4d85 LW	348	const char *gname = pctlops->get_group_name(pctldev, selector);
ae6b4d85 LW	349
a672eb5e	350	seq_printf(s, "%u (%s): ", selector, gname);
ae6b4d85	351	pinconf_dump_group(pctldev, s, selector, gname);
f7b9006f SW	352	seq_printf(s, "\n");
f7b9006f SW	353
ae6b4d85 LW	354	selector++;
	355	}
	356
	357	return 0;
	358	}
	359
	360	static int pinconf_pins_open(struct inode inode, struct file file)
	361	{
	362	return single_open(file, pinconf_pins_show, inode->i_private);
	363	}
	364
	365	static int pinconf_groups_open(struct inode inode, struct file file)
	366	{
	367	return single_open(file, pinconf_groups_show, inode->i_private);
	368	}
	369
	370	static const struct file_operations pinconf_pins_ops = {
	371	.open = pinconf_pins_open,
	372	.read = seq_read,
	373	.llseek = seq_lseek,
	374	.release = single_release,
	375	};
	376
	377	static const struct file_operations pinconf_groups_ops = {
	378	.open = pinconf_groups_open,
	379	.read = seq_read,
	380	.llseek = seq_lseek,
	381	.release = single_release,
	382	};
	383
f07512e6 LM	384	#define MAX_NAME_LEN 15
	385
	386	struct dbg_cfg {
	387	enum pinctrl_map_type map_type;
	388	char dev_name[MAX_NAME_LEN+1];
	389	char state_name[MAX_NAME_LEN+1];
	390	char pin_name[MAX_NAME_LEN+1];
	391	};
	392
	393	/*
	394	* Goal is to keep this structure as global in order to simply read the
	395	* pinconf-config file after a write to check config is as expected
	396	*/
	397	static struct dbg_cfg pinconf_dbg_conf;
	398
	399	/**
	400	* pinconf_dbg_config_print() - display the pinctrl config from the pinctrl
	401	* map, of the dev/pin/state that was last written to pinconf-config file.
	402	* @s: string filled in with config description
	403	* @d: not used
	404	*/
	405	static int pinconf_dbg_config_print(struct seq_file s, void d)
	406	{
	407	struct pinctrl_maps *maps_node;
	408	const struct pinctrl_map *map;
8a9dcc3f RKAL	409	const struct pinctrl_map *found = NULL;
8a9dcc3f RKAL	410	struct pinctrl_dev *pctldev;
f07512e6	411	struct dbg_cfg *dbg = &pinconf_dbg_conf;
d99c8053	412	int i;
f07512e6	413
a386267a	414	mutex_lock(&pinctrl_maps_mutex);
f07512e6 LM	415
	416	/* Parse the pinctrl map and look for the elected pin/state */
	417	for_each_maps(maps_node, i, map) {
	418	if (map->type != dbg->map_type)
	419	continue;
	420	if (strcmp(map->dev_name, dbg->dev_name))
	421	continue;
	422	if (strcmp(map->name, dbg->state_name))
	423	continue;
	424
d99c8053 LM	425	if (!strcmp(map->data.configs.group_or_pin, dbg->pin_name)) {
	426	/* We found the right pin */
	427	found = map;
	428	break;
f07512e6 LM	429	}
	430	}
	431
	432	if (!found) {
	433	seq_printf(s, "No config found for dev/state/pin, expected:\n");
	434	seq_printf(s, "Searched dev:%s\n", dbg->dev_name);
	435	seq_printf(s, "Searched state:%s\n", dbg->state_name);
	436	seq_printf(s, "Searched pin:%s\n", dbg->pin_name);
	437	seq_printf(s, "Use: modify config_pin <devname> "\
	438	"<state> <pinname> <value>\n");
	439	goto exit;
	440	}
	441
8a9dcc3f	442	pctldev = get_pinctrl_dev_from_devname(found->ctrl_dev_name);
d96310ae JH	443	seq_printf(s, "Dev %s has config of %s in state %s:\n",
	444	dbg->dev_name, dbg->pin_name, dbg->state_name);
	445	pinconf_show_config(s, pctldev, found->data.configs.configs,
	446	found->data.configs.num_configs);
f07512e6 LM	447
f07512e6 LM	448	exit:
a386267a	449	mutex_unlock(&pinctrl_maps_mutex);
f07512e6 LM	450
	451	return 0;
	452	}
	453
	454	/**
	455	* pinconf_dbg_config_write() - modify the pinctrl config in the pinctrl
	456	* map, of a dev/pin/state entry based on user entries to pinconf-config
	457	* @user_buf: contains the modification request with expected format:
75629981	458	* modify <config> <devicename> <state> <name> <newvalue>
f07512e6	459	* modify is literal string, alternatives like add/delete not supported yet
75629981 JH	460	* <config> is the configuration to be changed. Supported configs are
	461	* "config_pin" or "config_group", alternatives like config_mux are not
	462	* supported yet.
	463	* <devicename> <state> <name> are values that should match the pinctrl-maps
f07512e6 LM	464	* <newvalue> reflects the new config and is driver dependant
f07512e6 LM	465	*/
3b59e432	466	static ssize_t pinconf_dbg_config_write(struct file *file,
f07512e6 LM	467	const char __user user_buf, size_t count, loff_t ppos)
	468	{
	469	struct pinctrl_maps *maps_node;
	470	const struct pinctrl_map *map;
8a9dcc3f RKAL	471	const struct pinctrl_map *found = NULL;
8a9dcc3f RKAL	472	struct pinctrl_dev *pctldev;
f07512e6 LM	473	const struct pinconf_ops *confops = NULL;
	474	struct dbg_cfg *dbg = &pinconf_dbg_conf;
	475	const struct pinctrl_map_configs *configs;
	476	char config[MAX_NAME_LEN+1];
f07512e6 LM	477	char buf[128];
	478	char *b = &buf[0];
	479	int buf_size;
	480	char *token;
	481	int i;
	482
	483	/* Get userspace string and assure termination */
81d36c4f	484	buf_size = min(count, sizeof(buf) - 1);
f07512e6 LM	485	if (copy_from_user(buf, user_buf, buf_size))
	486	return -EFAULT;
	487	buf[buf_size] = 0;
	488
	489	/*
	490	* need to parse entry and extract parameters:
	491	* modify configs_pin devicename state pinname newvalue
	492	*/
	493
	494	/* Get arg: 'modify' */
	495	token = strsep(&b, " ");
	496	if (!token)
	497	return -EINVAL;
	498	if (strcmp(token, "modify"))
	499	return -EINVAL;
	500
75629981 JH	501	/*
	502	* Get arg type: "config_pin" and "config_group"
	503	* types are supported so far
	504	*/
f07512e6 LM	505	token = strsep(&b, " ");
	506	if (!token)
	507	return -EINVAL;
75629981 JH	508	if (!strcmp(token, "config_pin"))
	509	dbg->map_type = PIN_MAP_TYPE_CONFIGS_PIN;
	510	else if (!strcmp(token, "config_group"))
	511	dbg->map_type = PIN_MAP_TYPE_CONFIGS_GROUP;
	512	else
f07512e6	513	return -EINVAL;
f07512e6 LM	514
	515	/* get arg 'device_name' */
	516	token = strsep(&b, " ");
	517	if (token == NULL)
	518	return -EINVAL;
	519	if (strlen(token) >= MAX_NAME_LEN)
	520	return -EINVAL;
	521	strncpy(dbg->dev_name, token, MAX_NAME_LEN);
	522
	523	/* get arg 'state_name' */
	524	token = strsep(&b, " ");
	525	if (token == NULL)
	526	return -EINVAL;
	527	if (strlen(token) >= MAX_NAME_LEN)
	528	return -EINVAL;
	529	strncpy(dbg->state_name, token, MAX_NAME_LEN);
	530
	531	/* get arg 'pin_name' */
	532	token = strsep(&b, " ");
	533	if (token == NULL)
	534	return -EINVAL;
	535	if (strlen(token) >= MAX_NAME_LEN)
	536	return -EINVAL;
	537	strncpy(dbg->pin_name, token, MAX_NAME_LEN);
	538
	539	/* get new_value of config' */
	540	token = strsep(&b, " ");
	541	if (token == NULL)
	542	return -EINVAL;
	543	if (strlen(token) >= MAX_NAME_LEN)
	544	return -EINVAL;
	545	strncpy(config, token, MAX_NAME_LEN);
	546
42fed7ba	547	mutex_lock(&pinctrl_maps_mutex);
f07512e6 LM	548
	549	/* Parse the pinctrl map and look for the selected dev/state/pin */
	550	for_each_maps(maps_node, i, map) {
	551	if (strcmp(map->dev_name, dbg->dev_name))
	552	continue;
	553	if (map->type != dbg->map_type)
	554	continue;
	555	if (strcmp(map->name, dbg->state_name))
	556	continue;
	557
	558	/* we found the right pin / state, so overwrite config */
	559	if (!strcmp(map->data.configs.group_or_pin, dbg->pin_name)) {
8a9dcc3f	560	found = map;
f07512e6 LM	561	break;
	562	}
	563	}
	564
	565	if (!found) {
f07512e6	566	count = -EINVAL;
cb6d315d	567	goto exit;
f07512e6 LM	568	}
f07512e6 LM	569
8a9dcc3f	570	pctldev = get_pinctrl_dev_from_devname(found->ctrl_dev_name);
f07512e6 LM	571	if (pctldev)
	572	confops = pctldev->desc->confops;
	573
	574	if (confops && confops->pin_config_dbg_parse_modify) {
8a9dcc3f	575	configs = &found->data.configs;
f07512e6 LM	576	for (i = 0; i < configs->num_configs; i++) {
	577	confops->pin_config_dbg_parse_modify(pctldev,
	578	config,
	579	&configs->configs[i]);
	580	}
	581	}
	582
	583	exit:
42fed7ba	584	mutex_unlock(&pinctrl_maps_mutex);
f07512e6 LM	585
	586	return count;
	587	}
	588
	589	static int pinconf_dbg_config_open(struct inode inode, struct file file)
	590	{
	591	return single_open(file, pinconf_dbg_config_print, inode->i_private);
	592	}
	593
	594	static const struct file_operations pinconf_dbg_pinconfig_fops = {
	595	.open = pinconf_dbg_config_open,
	596	.write = pinconf_dbg_config_write,
	597	.read = seq_read,
	598	.llseek = seq_lseek,
	599	.release = single_release,
	600	.owner = THIS_MODULE,
	601	};
	602
ae6b4d85 LW	603	void pinconf_init_device_debugfs(struct dentry *devroot,
	604	struct pinctrl_dev *pctldev)
	605	{
	606	debugfs_create_file("pinconf-pins", S_IFREG \| S_IRUGO,
	607	devroot, pctldev, &pinconf_pins_ops);
	608	debugfs_create_file("pinconf-groups", S_IFREG \| S_IRUGO,
	609	devroot, pctldev, &pinconf_groups_ops);
f07512e6 LM	610	debugfs_create_file("pinconf-config", (S_IRUGO \| S_IWUSR \| S_IWGRP),
f07512e6 LM	611	devroot, pctldev, &pinconf_dbg_pinconfig_fops);
ae6b4d85 LW	612	}
	613
	614	#endif