[mirror_ubuntu-bionic-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 ? desc->name : "unnamed",
			   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 ? desc->name : "unnamed");

		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, j;

	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;

		for (j = 0; j < map->data.configs.num_configs; j++) {
			if (!strcmp(map->data.configs.group_or_pin,
					dbg->pin_name)) {
				/* We found the right pin / state */
				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);
	261	seq_printf(s, "pin %s (%d)",
	262	desc->name ? desc->name : "unnamed",
	263	setting->data.configs.group_or_pin);
	264	break;
	265	case PIN_MAP_TYPE_CONFIGS_GROUP:
	266	seq_printf(s, "group %s (%d)",
	267	pctlops->get_group_name(pctldev,
	268	setting->data.configs.group_or_pin),
	269	setting->data.configs.group_or_pin);
	270	break;
	271	default:
	272	break;
	273	}
	274
	275	/*
	276	* FIXME: We should really get the pin controler to dump the config
	277	* values, so they can be decoded to something meaningful.
	278	*/
d96310ae JH	279	pinconf_show_config(s, pctldev, setting->data.configs.configs,
d96310ae JH	280	setting->data.configs.num_configs);
1e2082b5 SW	281	}
1e2082b5 SW	282
ae6b4d85 LW	283	static void pinconf_dump_pin(struct pinctrl_dev *pctldev,
	284	struct seq_file *s, int pin)
	285	{
	286	const struct pinconf_ops *ops = pctldev->desc->confops;
	287
394349f7	288	/* no-op when not using generic pin config */
dd4d01f7	289	pinconf_generic_dump_pins(pctldev, s, NULL, pin);
ae6b4d85 LW	290	if (ops && ops->pin_config_dbg_show)
	291	ops->pin_config_dbg_show(pctldev, s, pin);
	292	}
	293
	294	static int pinconf_pins_show(struct seq_file s, void what)
	295	{
	296	struct pinctrl_dev *pctldev = s->private;
706e8520	297	unsigned i, pin;
ae6b4d85 LW	298
ae6b4d85 LW	299	seq_puts(s, "Pin config settings per pin\n");
2aeefe02	300	seq_puts(s, "Format: pin (name): configs\n");
ae6b4d85	301
42fed7ba	302	mutex_lock(&pctldev->mutex);
57b676f9	303
706e8520	304	/* The pin number can be retrived from the pin controller descriptor */
546edd83	305	for (i = 0; i < pctldev->desc->npins; i++) {
ae6b4d85 LW	306	struct pin_desc *desc;
ae6b4d85 LW	307
706e8520	308	pin = pctldev->desc->pins[i].number;
ae6b4d85	309	desc = pin_desc_get(pctldev, pin);
706e8520	310	/* Skip if we cannot search the pin */
ae6b4d85 LW	311	if (desc == NULL)
	312	continue;
	313
	314	seq_printf(s, "pin %d (%s):", pin,
	315	desc->name ? desc->name : "unnamed");
	316
	317	pinconf_dump_pin(pctldev, s, pin);
	318
	319	seq_printf(s, "\n");
	320	}
	321
42fed7ba	322	mutex_unlock(&pctldev->mutex);
57b676f9	323
ae6b4d85 LW	324	return 0;
	325	}
	326
	327	static void pinconf_dump_group(struct pinctrl_dev *pctldev,
	328	struct seq_file *s, unsigned selector,
	329	const char *gname)
	330	{
	331	const struct pinconf_ops *ops = pctldev->desc->confops;
	332
394349f7	333	/* no-op when not using generic pin config */
dd4d01f7	334	pinconf_generic_dump_pins(pctldev, s, gname, 0);
ae6b4d85 LW	335	if (ops && ops->pin_config_group_dbg_show)
	336	ops->pin_config_group_dbg_show(pctldev, s, selector);
	337	}
	338
	339	static int pinconf_groups_show(struct seq_file s, void what)
	340	{
	341	struct pinctrl_dev *pctldev = s->private;
	342	const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
d1e90e9e	343	unsigned ngroups = pctlops->get_groups_count(pctldev);
ae6b4d85 LW	344	unsigned selector = 0;
ae6b4d85 LW	345
ae6b4d85	346	seq_puts(s, "Pin config settings per pin group\n");
2aeefe02	347	seq_puts(s, "Format: group (name): configs\n");
ae6b4d85	348
d1e90e9e	349	while (selector < ngroups) {
ae6b4d85 LW	350	const char *gname = pctlops->get_group_name(pctldev, selector);
	351
	352	seq_printf(s, "%u (%s):", selector, gname);
	353	pinconf_dump_group(pctldev, s, selector, gname);
f7b9006f SW	354	seq_printf(s, "\n");
f7b9006f SW	355
ae6b4d85 LW	356	selector++;
	357	}
	358
	359	return 0;
	360	}
	361
	362	static int pinconf_pins_open(struct inode inode, struct file file)
	363	{
	364	return single_open(file, pinconf_pins_show, inode->i_private);
	365	}
	366
	367	static int pinconf_groups_open(struct inode inode, struct file file)
	368	{
	369	return single_open(file, pinconf_groups_show, inode->i_private);
	370	}
	371
	372	static const struct file_operations pinconf_pins_ops = {
	373	.open = pinconf_pins_open,
	374	.read = seq_read,
	375	.llseek = seq_lseek,
	376	.release = single_release,
	377	};
	378
	379	static const struct file_operations pinconf_groups_ops = {
	380	.open = pinconf_groups_open,
	381	.read = seq_read,
	382	.llseek = seq_lseek,
	383	.release = single_release,
	384	};
	385
f07512e6 LM	386	#define MAX_NAME_LEN 15
	387
	388	struct dbg_cfg {
	389	enum pinctrl_map_type map_type;
	390	char dev_name[MAX_NAME_LEN+1];
	391	char state_name[MAX_NAME_LEN+1];
	392	char pin_name[MAX_NAME_LEN+1];
	393	};
	394
	395	/*
	396	* Goal is to keep this structure as global in order to simply read the
	397	* pinconf-config file after a write to check config is as expected
	398	*/
	399	static struct dbg_cfg pinconf_dbg_conf;
	400
	401	/**
	402	* pinconf_dbg_config_print() - display the pinctrl config from the pinctrl
	403	* map, of the dev/pin/state that was last written to pinconf-config file.
	404	* @s: string filled in with config description
	405	* @d: not used
	406	*/
	407	static int pinconf_dbg_config_print(struct seq_file s, void d)
	408	{
	409	struct pinctrl_maps *maps_node;
	410	const struct pinctrl_map *map;
8a9dcc3f RKAL	411	const struct pinctrl_map *found = NULL;
8a9dcc3f RKAL	412	struct pinctrl_dev *pctldev;
f07512e6 LM	413	struct dbg_cfg *dbg = &pinconf_dbg_conf;
f07512e6 LM	414	int i, j;
f07512e6	415
a386267a	416	mutex_lock(&pinctrl_maps_mutex);
f07512e6 LM	417
	418	/* Parse the pinctrl map and look for the elected pin/state */
	419	for_each_maps(maps_node, i, map) {
	420	if (map->type != dbg->map_type)
	421	continue;
	422	if (strcmp(map->dev_name, dbg->dev_name))
	423	continue;
	424	if (strcmp(map->name, dbg->state_name))
	425	continue;
	426
	427	for (j = 0; j < map->data.configs.num_configs; j++) {
	428	if (!strcmp(map->data.configs.group_or_pin,
	429	dbg->pin_name)) {
8a9dcc3f RKAL	430	/* We found the right pin / state */
8a9dcc3f RKAL	431	found = map;
f07512e6 LM	432	break;
	433	}
	434	}
	435	}
	436
	437	if (!found) {
	438	seq_printf(s, "No config found for dev/state/pin, expected:\n");
	439	seq_printf(s, "Searched dev:%s\n", dbg->dev_name);
	440	seq_printf(s, "Searched state:%s\n", dbg->state_name);
	441	seq_printf(s, "Searched pin:%s\n", dbg->pin_name);
	442	seq_printf(s, "Use: modify config_pin <devname> "\
	443	"<state> <pinname> <value>\n");
	444	goto exit;
	445	}
	446
8a9dcc3f	447	pctldev = get_pinctrl_dev_from_devname(found->ctrl_dev_name);
d96310ae JH	448	seq_printf(s, "Dev %s has config of %s in state %s:\n",
	449	dbg->dev_name, dbg->pin_name, dbg->state_name);
	450	pinconf_show_config(s, pctldev, found->data.configs.configs,
	451	found->data.configs.num_configs);
f07512e6 LM	452
f07512e6 LM	453	exit:
a386267a	454	mutex_unlock(&pinctrl_maps_mutex);
f07512e6 LM	455
	456	return 0;
	457	}
	458
	459	/**
	460	* pinconf_dbg_config_write() - modify the pinctrl config in the pinctrl
	461	* map, of a dev/pin/state entry based on user entries to pinconf-config
	462	* @user_buf: contains the modification request with expected format:
75629981	463	* modify <config> <devicename> <state> <name> <newvalue>
f07512e6	464	* modify is literal string, alternatives like add/delete not supported yet
75629981 JH	465	* <config> is the configuration to be changed. Supported configs are
	466	* "config_pin" or "config_group", alternatives like config_mux are not
	467	* supported yet.
	468	* <devicename> <state> <name> are values that should match the pinctrl-maps
f07512e6 LM	469	* <newvalue> reflects the new config and is driver dependant
f07512e6 LM	470	*/
3b59e432	471	static ssize_t pinconf_dbg_config_write(struct file *file,
f07512e6 LM	472	const char __user user_buf, size_t count, loff_t ppos)
	473	{
	474	struct pinctrl_maps *maps_node;
	475	const struct pinctrl_map *map;
8a9dcc3f RKAL	476	const struct pinctrl_map *found = NULL;
8a9dcc3f RKAL	477	struct pinctrl_dev *pctldev;
f07512e6 LM	478	const struct pinconf_ops *confops = NULL;
	479	struct dbg_cfg *dbg = &pinconf_dbg_conf;
	480	const struct pinctrl_map_configs *configs;
	481	char config[MAX_NAME_LEN+1];
f07512e6 LM	482	char buf[128];
	483	char *b = &buf[0];
	484	int buf_size;
	485	char *token;
	486	int i;
	487
	488	/* Get userspace string and assure termination */
81d36c4f	489	buf_size = min(count, sizeof(buf) - 1);
f07512e6 LM	490	if (copy_from_user(buf, user_buf, buf_size))
	491	return -EFAULT;
	492	buf[buf_size] = 0;
	493
	494	/*
	495	* need to parse entry and extract parameters:
	496	* modify configs_pin devicename state pinname newvalue
	497	*/
	498
	499	/* Get arg: 'modify' */
	500	token = strsep(&b, " ");
	501	if (!token)
	502	return -EINVAL;
	503	if (strcmp(token, "modify"))
	504	return -EINVAL;
	505
75629981 JH	506	/*
	507	* Get arg type: "config_pin" and "config_group"
	508	* types are supported so far
	509	*/
f07512e6 LM	510	token = strsep(&b, " ");
	511	if (!token)
	512	return -EINVAL;
75629981 JH	513	if (!strcmp(token, "config_pin"))
	514	dbg->map_type = PIN_MAP_TYPE_CONFIGS_PIN;
	515	else if (!strcmp(token, "config_group"))
	516	dbg->map_type = PIN_MAP_TYPE_CONFIGS_GROUP;
	517	else
f07512e6	518	return -EINVAL;
f07512e6 LM	519
	520	/* get arg 'device_name' */
	521	token = strsep(&b, " ");
	522	if (token == NULL)
	523	return -EINVAL;
	524	if (strlen(token) >= MAX_NAME_LEN)
	525	return -EINVAL;
	526	strncpy(dbg->dev_name, token, MAX_NAME_LEN);
	527
	528	/* get arg 'state_name' */
	529	token = strsep(&b, " ");
	530	if (token == NULL)
	531	return -EINVAL;
	532	if (strlen(token) >= MAX_NAME_LEN)
	533	return -EINVAL;
	534	strncpy(dbg->state_name, token, MAX_NAME_LEN);
	535
	536	/* get arg 'pin_name' */
	537	token = strsep(&b, " ");
	538	if (token == NULL)
	539	return -EINVAL;
	540	if (strlen(token) >= MAX_NAME_LEN)
	541	return -EINVAL;
	542	strncpy(dbg->pin_name, token, MAX_NAME_LEN);
	543
	544	/* get new_value of config' */
	545	token = strsep(&b, " ");
	546	if (token == NULL)
	547	return -EINVAL;
	548	if (strlen(token) >= MAX_NAME_LEN)
	549	return -EINVAL;
	550	strncpy(config, token, MAX_NAME_LEN);
	551
42fed7ba	552	mutex_lock(&pinctrl_maps_mutex);
f07512e6 LM	553
	554	/* Parse the pinctrl map and look for the selected dev/state/pin */
	555	for_each_maps(maps_node, i, map) {
	556	if (strcmp(map->dev_name, dbg->dev_name))
	557	continue;
	558	if (map->type != dbg->map_type)
	559	continue;
	560	if (strcmp(map->name, dbg->state_name))
	561	continue;
	562
	563	/* we found the right pin / state, so overwrite config */
	564	if (!strcmp(map->data.configs.group_or_pin, dbg->pin_name)) {
8a9dcc3f	565	found = map;
f07512e6 LM	566	break;
	567	}
	568	}
	569
	570	if (!found) {
f07512e6	571	count = -EINVAL;
cb6d315d	572	goto exit;
f07512e6 LM	573	}
f07512e6 LM	574
8a9dcc3f	575	pctldev = get_pinctrl_dev_from_devname(found->ctrl_dev_name);
f07512e6 LM	576	if (pctldev)
	577	confops = pctldev->desc->confops;
	578
	579	if (confops && confops->pin_config_dbg_parse_modify) {
8a9dcc3f	580	configs = &found->data.configs;
f07512e6 LM	581	for (i = 0; i < configs->num_configs; i++) {
	582	confops->pin_config_dbg_parse_modify(pctldev,
	583	config,
	584	&configs->configs[i]);
	585	}
	586	}
	587
	588	exit:
42fed7ba	589	mutex_unlock(&pinctrl_maps_mutex);
f07512e6 LM	590
	591	return count;
	592	}
	593
	594	static int pinconf_dbg_config_open(struct inode inode, struct file file)
	595	{
	596	return single_open(file, pinconf_dbg_config_print, inode->i_private);
	597	}
	598
	599	static const struct file_operations pinconf_dbg_pinconfig_fops = {
	600	.open = pinconf_dbg_config_open,
	601	.write = pinconf_dbg_config_write,
	602	.read = seq_read,
	603	.llseek = seq_lseek,
	604	.release = single_release,
	605	.owner = THIS_MODULE,
	606	};
	607
ae6b4d85 LW	608	void pinconf_init_device_debugfs(struct dentry *devroot,
	609	struct pinctrl_dev *pctldev)
	610	{
	611	debugfs_create_file("pinconf-pins", S_IFREG \| S_IRUGO,
	612	devroot, pctldev, &pinconf_pins_ops);
	613	debugfs_create_file("pinconf-groups", S_IFREG \| S_IRUGO,
	614	devroot, pctldev, &pinconf_groups_ops);
f07512e6 LM	615	debugfs_create_file("pinconf-config", (S_IRUGO \| S_IWUSR \| S_IWGRP),
f07512e6 LM	616	devroot, pctldev, &pinconf_dbg_pinconfig_fops);
ae6b4d85 LW	617	}
	618
	619	#endif