[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 must be able to read out pin status */
	if (!ops->pin_config_get && !ops->pin_config_group_get) {
		dev_err(pctldev->dev,
			"pinconf must be able to read out pin status\n");
		return -EINVAL;
	}
	/* 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_err(pctldev->dev, "cannot get pin configuration, missing "
			"pin_config_get() function in driver\n");
		return -EINVAL;
	}

	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_err(pctldev->dev, "cannot get configuration for pin "
			"group, missing group config get function in "
			"driver\n");
		ret = -EINVAL;
		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

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

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

	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);

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

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;
	const struct pinconf_ops *confops = pctldev->desc->confops;
	struct pin_desc *desc;
	int i;

	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.
	 */
	for (i = 0; i < setting->data.configs.num_configs; i++) {
		seq_printf(s, " ");
		if (confops && confops->pin_config_config_dbg_show)
			confops->pin_config_config_dbg_show(pctldev, s,
				setting->data.configs.configs[i]);
		else
			seq_printf(s, "%08lx",
				   setting->data.configs.configs[i]);
	}

	seq_printf(s, "\n");
}

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_pin(pctldev, s, 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;
	const struct pinconf_ops *ops = pctldev->desc->confops;
	unsigned i, pin;

	if (!ops || !ops->pin_config_get)
		return 0;

	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_group(pctldev, s, gname);
	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;
	const struct pinconf_ops *ops = pctldev->desc->confops;
	unsigned ngroups = pctlops->get_groups_count(pctldev);
	unsigned selector = 0;

	if (!ops || !ops->pin_config_group_get)
		return 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;
	const struct pinconf_ops *confops = NULL;
	struct dbg_cfg *dbg = &pinconf_dbg_conf;
	int i, j;
	unsigned long config;

	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);
	config = *found->data.configs.configs;
	seq_printf(s, "Dev %s has config of %s in state %s: 0x%08lX\n",
			dbg->dev_name, dbg->pin_name,
			dbg->state_name, config);

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

	if (confops && confops->pin_config_config_dbg_show)
		confops->pin_config_config_dbg_show(pctldev, s, config);

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_pin <devicename> <state> <pinname> <newvalue>
 * modify is literal string, alternatives like add/delete not supported yet
 * config_pin is literal, alternatives like config_mux not supported yet
 * <devicename> <state> <pinname> are values that should match the pinctrl-maps
 * <newvalue> reflects the new config and is driver dependant
 */
static int 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, (size_t)(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" type supported so far */
	token = strsep(&b, " ");
	if (!token)
		return -EINVAL;
	if (strcmp(token, "config_pin"))
		return -EINVAL;
	dbg->map_type = PIN_MAP_TYPE_CONFIGS_PIN;

	/* 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
	31	/* We must be able to read out pin status */
ad6e1107 JC	32	if (!ops->pin_config_get && !ops->pin_config_group_get) {
	33	dev_err(pctldev->dev,
	34	"pinconf must be able to read out pin status\n");
2b694250	35	return -EINVAL;
ad6e1107	36	}
2b694250	37	/* We have to be able to config the pins in SOME way */
ad6e1107 JC	38	if (!ops->pin_config_set && !ops->pin_config_group_set) {
	39	dev_err(pctldev->dev,
	40	"pinconf has to be able to set a pins config\n");
2b694250	41	return -EINVAL;
ad6e1107	42	}
2b694250 SW	43	return 0;
	44	}
	45
1e2082b5 SW	46	int pinconf_validate_map(struct pinctrl_map const *map, int i)
	47	{
	48	if (!map->data.configs.group_or_pin) {
	49	pr_err("failed to register map %s (%d): no group/pin given\n",
	50	map->name, i);
	51	return -EINVAL;
	52	}
	53
c95df2db	54	if (!map->data.configs.num_configs \|\|
1e2082b5	55	!map->data.configs.configs) {
c95df2db	56	pr_err("failed to register map %s (%d): no configs given\n",
1e2082b5 SW	57	map->name, i);
	58	return -EINVAL;
	59	}
	60
	61	return 0;
	62	}
	63
394349f7	64	int pin_config_get_for_pin(struct pinctrl_dev *pctldev, unsigned pin,
ae6b4d85 LW	65	unsigned long *config)
	66	{
	67	const struct pinconf_ops *ops = pctldev->desc->confops;
	68
	69	if (!ops \|\| !ops->pin_config_get) {
51cd24ee	70	dev_err(pctldev->dev, "cannot get pin configuration, missing "
ae6b4d85 LW	71	"pin_config_get() function in driver\n");
	72	return -EINVAL;
	73	}
	74
	75	return ops->pin_config_get(pctldev, pin, config);
	76	}
	77
43699dea	78	int pin_config_group_get(const char dev_name, const char pin_group,
ae6b4d85 LW	79	unsigned long *config)
ae6b4d85 LW	80	{
43699dea SW	81	struct pinctrl_dev *pctldev;
43699dea SW	82	const struct pinconf_ops *ops;
57b676f9 SW	83	int selector, ret;
57b676f9 SW	84
9dfac4fd	85	pctldev = get_pinctrl_dev_from_devname(dev_name);
57b676f9 SW	86	if (!pctldev) {
57b676f9 SW	87	ret = -EINVAL;
42fed7ba	88	return ret;
57b676f9	89	}
42fed7ba PC	90
	91	mutex_lock(&pctldev->mutex);
	92
43699dea SW	93	ops = pctldev->desc->confops;
43699dea SW	94
ae6b4d85	95	if (!ops \|\| !ops->pin_config_group_get) {
51cd24ee	96	dev_err(pctldev->dev, "cannot get configuration for pin "
ae6b4d85 LW	97	"group, missing group config get function in "
ae6b4d85 LW	98	"driver\n");
57b676f9 SW	99	ret = -EINVAL;
57b676f9 SW	100	goto unlock;
ae6b4d85 LW	101	}
	102
	103	selector = pinctrl_get_group_selector(pctldev, pin_group);
57b676f9 SW	104	if (selector < 0) {
	105	ret = selector;
	106	goto unlock;
	107	}
ae6b4d85	108
57b676f9 SW	109	ret = ops->pin_config_group_get(pctldev, selector, config);
	110
	111	unlock:
42fed7ba	112	mutex_unlock(&pctldev->mutex);
57b676f9	113	return ret;
ae6b4d85	114	}
ae6b4d85	115
1e2082b5 SW	116	int pinconf_map_to_setting(struct pinctrl_map const *map,
	117	struct pinctrl_setting *setting)
	118	{
	119	struct pinctrl_dev *pctldev = setting->pctldev;
70b36378	120	int pin;
1e2082b5 SW	121
	122	switch (setting->type) {
	123	case PIN_MAP_TYPE_CONFIGS_PIN:
70b36378 LW	124	pin = pin_get_from_name(pctldev,
	125	map->data.configs.group_or_pin);
	126	if (pin < 0) {
	127	dev_err(pctldev->dev, "could not map pin config for \"%s\"",
	128	map->data.configs.group_or_pin);
	129	return pin;
	130	}
	131	setting->data.configs.group_or_pin = pin;
1e2082b5 SW	132	break;
1e2082b5 SW	133	case PIN_MAP_TYPE_CONFIGS_GROUP:
70b36378 LW	134	pin = pinctrl_get_group_selector(pctldev,
	135	map->data.configs.group_or_pin);
	136	if (pin < 0) {
	137	dev_err(pctldev->dev, "could not map group config for \"%s\"",
	138	map->data.configs.group_or_pin);
	139	return pin;
	140	}
	141	setting->data.configs.group_or_pin = pin;
1e2082b5 SW	142	break;
	143	default:
	144	return -EINVAL;
	145	}
	146
	147	setting->data.configs.num_configs = map->data.configs.num_configs;
	148	setting->data.configs.configs = map->data.configs.configs;
	149
	150	return 0;
	151	}
	152
	153	void pinconf_free_setting(struct pinctrl_setting const *setting)
	154	{
	155	}
	156
	157	int pinconf_apply_setting(struct pinctrl_setting const *setting)
	158	{
	159	struct pinctrl_dev *pctldev = setting->pctldev;
	160	const struct pinconf_ops *ops = pctldev->desc->confops;
03b054e9	161	int ret;
1e2082b5 SW	162
	163	if (!ops) {
	164	dev_err(pctldev->dev, "missing confops\n");
	165	return -EINVAL;
	166	}
	167
	168	switch (setting->type) {
	169	case PIN_MAP_TYPE_CONFIGS_PIN:
	170	if (!ops->pin_config_set) {
	171	dev_err(pctldev->dev, "missing pin_config_set op\n");
	172	return -EINVAL;
	173	}
03b054e9 SY	174	ret = ops->pin_config_set(pctldev,
	175	setting->data.configs.group_or_pin,
	176	setting->data.configs.configs,
	177	setting->data.configs.num_configs);
	178	if (ret < 0) {
	179	dev_err(pctldev->dev,
	180	"pin_config_set op failed for pin %d\n",
	181	setting->data.configs.group_or_pin);
	182	return ret;
1e2082b5 SW	183	}
	184	break;
	185	case PIN_MAP_TYPE_CONFIGS_GROUP:
	186	if (!ops->pin_config_group_set) {
	187	dev_err(pctldev->dev,
	188	"missing pin_config_group_set op\n");
	189	return -EINVAL;
	190	}
03b054e9 SY	191	ret = ops->pin_config_group_set(pctldev,
	192	setting->data.configs.group_or_pin,
	193	setting->data.configs.configs,
	194	setting->data.configs.num_configs);
	195	if (ret < 0) {
	196	dev_err(pctldev->dev,
	197	"pin_config_group_set op failed for group %d\n",
	198	setting->data.configs.group_or_pin);
	199	return ret;
1e2082b5 SW	200	}
	201	break;
	202	default:
	203	return -EINVAL;
	204	}
	205
	206	return 0;
	207	}
	208
ae6b4d85 LW	209	#ifdef CONFIG_DEBUG_FS
ae6b4d85 LW	210
1e2082b5 SW	211	void pinconf_show_map(struct seq_file s, struct pinctrl_map const map)
1e2082b5 SW	212	{
6cb41587 SW	213	struct pinctrl_dev *pctldev;
6cb41587 SW	214	const struct pinconf_ops *confops;
1e2082b5 SW	215	int i;
1e2082b5 SW	216
6cb41587 SW	217	pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name);
	218	if (pctldev)
	219	confops = pctldev->desc->confops;
	220	else
	221	confops = NULL;
	222
1e2082b5 SW	223	switch (map->type) {
	224	case PIN_MAP_TYPE_CONFIGS_PIN:
	225	seq_printf(s, "pin ");
	226	break;
	227	case PIN_MAP_TYPE_CONFIGS_GROUP:
	228	seq_printf(s, "group ");
	229	break;
	230	default:
	231	break;
	232	}
	233
	234	seq_printf(s, "%s\n", map->data.configs.group_or_pin);
	235
6cb41587 SW	236	for (i = 0; i < map->data.configs.num_configs; i++) {
	237	seq_printf(s, "config ");
	238	if (confops && confops->pin_config_config_dbg_show)
	239	confops->pin_config_config_dbg_show(pctldev, s,
	240	map->data.configs.configs[i]);
	241	else
	242	seq_printf(s, "%08lx", map->data.configs.configs[i]);
	243	seq_printf(s, "\n");
	244	}
1e2082b5 SW	245	}
	246
	247	void pinconf_show_setting(struct seq_file *s,
	248	struct pinctrl_setting const *setting)
	249	{
	250	struct pinctrl_dev *pctldev = setting->pctldev;
	251	const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
6cb41587	252	const struct pinconf_ops *confops = pctldev->desc->confops;
1e2082b5 SW	253	struct pin_desc *desc;
	254	int i;
	255
	256	switch (setting->type) {
	257	case PIN_MAP_TYPE_CONFIGS_PIN:
	258	desc = pin_desc_get(setting->pctldev,
	259	setting->data.configs.group_or_pin);
	260	seq_printf(s, "pin %s (%d)",
	261	desc->name ? desc->name : "unnamed",
	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	*/
6cb41587 SW	278	for (i = 0; i < setting->data.configs.num_configs; i++) {
	279	seq_printf(s, " ");
	280	if (confops && confops->pin_config_config_dbg_show)
	281	confops->pin_config_config_dbg_show(pctldev, s,
	282	setting->data.configs.configs[i]);
	283	else
	284	seq_printf(s, "%08lx",
	285	setting->data.configs.configs[i]);
	286	}
1e2082b5 SW	287
	288	seq_printf(s, "\n");
	289	}
	290
ae6b4d85 LW	291	static void pinconf_dump_pin(struct pinctrl_dev *pctldev,
	292	struct seq_file *s, int pin)
	293	{
	294	const struct pinconf_ops *ops = pctldev->desc->confops;
	295
394349f7 LW	296	/* no-op when not using generic pin config */
394349f7 LW	297	pinconf_generic_dump_pin(pctldev, s, pin);
ae6b4d85 LW	298	if (ops && ops->pin_config_dbg_show)
	299	ops->pin_config_dbg_show(pctldev, s, pin);
	300	}
	301
	302	static int pinconf_pins_show(struct seq_file s, void what)
	303	{
	304	struct pinctrl_dev *pctldev = s->private;
ad8bb720	305	const struct pinconf_ops *ops = pctldev->desc->confops;
706e8520	306	unsigned i, pin;
ae6b4d85	307
ad8bb720 DA	308	if (!ops \|\| !ops->pin_config_get)
	309	return 0;
	310
ae6b4d85	311	seq_puts(s, "Pin config settings per pin\n");
2aeefe02	312	seq_puts(s, "Format: pin (name): configs\n");
ae6b4d85	313
42fed7ba	314	mutex_lock(&pctldev->mutex);
57b676f9	315
706e8520	316	/* The pin number can be retrived from the pin controller descriptor */
546edd83	317	for (i = 0; i < pctldev->desc->npins; i++) {
ae6b4d85 LW	318	struct pin_desc *desc;
ae6b4d85 LW	319
706e8520	320	pin = pctldev->desc->pins[i].number;
ae6b4d85	321	desc = pin_desc_get(pctldev, pin);
706e8520	322	/* Skip if we cannot search the pin */
ae6b4d85 LW	323	if (desc == NULL)
	324	continue;
	325
	326	seq_printf(s, "pin %d (%s):", pin,
	327	desc->name ? desc->name : "unnamed");
	328
	329	pinconf_dump_pin(pctldev, s, pin);
	330
	331	seq_printf(s, "\n");
	332	}
	333
42fed7ba	334	mutex_unlock(&pctldev->mutex);
57b676f9	335
ae6b4d85 LW	336	return 0;
	337	}
	338
	339	static void pinconf_dump_group(struct pinctrl_dev *pctldev,
	340	struct seq_file *s, unsigned selector,
	341	const char *gname)
	342	{
	343	const struct pinconf_ops *ops = pctldev->desc->confops;
	344
394349f7 LW	345	/* no-op when not using generic pin config */
394349f7 LW	346	pinconf_generic_dump_group(pctldev, s, gname);
ae6b4d85 LW	347	if (ops && ops->pin_config_group_dbg_show)
	348	ops->pin_config_group_dbg_show(pctldev, s, selector);
	349	}
	350
	351	static int pinconf_groups_show(struct seq_file s, void what)
	352	{
	353	struct pinctrl_dev *pctldev = s->private;
	354	const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
	355	const struct pinconf_ops *ops = pctldev->desc->confops;
d1e90e9e	356	unsigned ngroups = pctlops->get_groups_count(pctldev);
ae6b4d85 LW	357	unsigned selector = 0;
	358
	359	if (!ops \|\| !ops->pin_config_group_get)
	360	return 0;
	361
	362	seq_puts(s, "Pin config settings per pin group\n");
2aeefe02	363	seq_puts(s, "Format: group (name): configs\n");
ae6b4d85	364
d1e90e9e	365	while (selector < ngroups) {
ae6b4d85 LW	366	const char *gname = pctlops->get_group_name(pctldev, selector);
	367
	368	seq_printf(s, "%u (%s):", selector, gname);
	369	pinconf_dump_group(pctldev, s, selector, gname);
f7b9006f SW	370	seq_printf(s, "\n");
f7b9006f SW	371
ae6b4d85 LW	372	selector++;
	373	}
	374
	375	return 0;
	376	}
	377
	378	static int pinconf_pins_open(struct inode inode, struct file file)
	379	{
	380	return single_open(file, pinconf_pins_show, inode->i_private);
	381	}
	382
	383	static int pinconf_groups_open(struct inode inode, struct file file)
	384	{
	385	return single_open(file, pinconf_groups_show, inode->i_private);
	386	}
	387
	388	static const struct file_operations pinconf_pins_ops = {
	389	.open = pinconf_pins_open,
	390	.read = seq_read,
	391	.llseek = seq_lseek,
	392	.release = single_release,
	393	};
	394
	395	static const struct file_operations pinconf_groups_ops = {
	396	.open = pinconf_groups_open,
	397	.read = seq_read,
	398	.llseek = seq_lseek,
	399	.release = single_release,
	400	};
	401
f07512e6 LM	402	#define MAX_NAME_LEN 15
	403
	404	struct dbg_cfg {
	405	enum pinctrl_map_type map_type;
	406	char dev_name[MAX_NAME_LEN+1];
	407	char state_name[MAX_NAME_LEN+1];
	408	char pin_name[MAX_NAME_LEN+1];
	409	};
	410
	411	/*
	412	* Goal is to keep this structure as global in order to simply read the
	413	* pinconf-config file after a write to check config is as expected
	414	*/
	415	static struct dbg_cfg pinconf_dbg_conf;
	416
	417	/**
	418	* pinconf_dbg_config_print() - display the pinctrl config from the pinctrl
	419	* map, of the dev/pin/state that was last written to pinconf-config file.
	420	* @s: string filled in with config description
	421	* @d: not used
	422	*/
	423	static int pinconf_dbg_config_print(struct seq_file s, void d)
	424	{
	425	struct pinctrl_maps *maps_node;
	426	const struct pinctrl_map *map;
8a9dcc3f RKAL	427	const struct pinctrl_map *found = NULL;
8a9dcc3f RKAL	428	struct pinctrl_dev *pctldev;
f07512e6	429	const struct pinconf_ops *confops = NULL;
f07512e6 LM	430	struct dbg_cfg *dbg = &pinconf_dbg_conf;
f07512e6 LM	431	int i, j;
f07512e6 LM	432	unsigned long config;
f07512e6 LM	433
a386267a	434	mutex_lock(&pinctrl_maps_mutex);
f07512e6 LM	435
	436	/* Parse the pinctrl map and look for the elected pin/state */
	437	for_each_maps(maps_node, i, map) {
	438	if (map->type != dbg->map_type)
	439	continue;
	440	if (strcmp(map->dev_name, dbg->dev_name))
	441	continue;
	442	if (strcmp(map->name, dbg->state_name))
	443	continue;
	444
	445	for (j = 0; j < map->data.configs.num_configs; j++) {
	446	if (!strcmp(map->data.configs.group_or_pin,
	447	dbg->pin_name)) {
8a9dcc3f RKAL	448	/* We found the right pin / state */
8a9dcc3f RKAL	449	found = map;
f07512e6 LM	450	break;
	451	}
	452	}
	453	}
	454
	455	if (!found) {
	456	seq_printf(s, "No config found for dev/state/pin, expected:\n");
	457	seq_printf(s, "Searched dev:%s\n", dbg->dev_name);
	458	seq_printf(s, "Searched state:%s\n", dbg->state_name);
	459	seq_printf(s, "Searched pin:%s\n", dbg->pin_name);
	460	seq_printf(s, "Use: modify config_pin <devname> "\
	461	"<state> <pinname> <value>\n");
	462	goto exit;
	463	}
	464
8a9dcc3f RKAL	465	pctldev = get_pinctrl_dev_from_devname(found->ctrl_dev_name);
8a9dcc3f RKAL	466	config = *found->data.configs.configs;
f07512e6 LM	467	seq_printf(s, "Dev %s has config of %s in state %s: 0x%08lX\n",
	468	dbg->dev_name, dbg->pin_name,
	469	dbg->state_name, config);
	470
	471	if (pctldev)
	472	confops = pctldev->desc->confops;
	473
	474	if (confops && confops->pin_config_config_dbg_show)
	475	confops->pin_config_config_dbg_show(pctldev, s, config);
	476
	477	exit:
a386267a	478	mutex_unlock(&pinctrl_maps_mutex);
f07512e6 LM	479
	480	return 0;
	481	}
	482
	483	/**
	484	* pinconf_dbg_config_write() - modify the pinctrl config in the pinctrl
	485	* map, of a dev/pin/state entry based on user entries to pinconf-config
	486	* @user_buf: contains the modification request with expected format:
	487	* modify config_pin <devicename> <state> <pinname> <newvalue>
	488	* modify is literal string, alternatives like add/delete not supported yet
	489	* config_pin is literal, alternatives like config_mux not supported yet
	490	* <devicename> <state> <pinname> are values that should match the pinctrl-maps
	491	* <newvalue> reflects the new config and is driver dependant
	492	*/
	493	static int pinconf_dbg_config_write(struct file *file,
	494	const char __user user_buf, size_t count, loff_t ppos)
	495	{
	496	struct pinctrl_maps *maps_node;
	497	const struct pinctrl_map *map;
8a9dcc3f RKAL	498	const struct pinctrl_map *found = NULL;
8a9dcc3f RKAL	499	struct pinctrl_dev *pctldev;
f07512e6 LM	500	const struct pinconf_ops *confops = NULL;
	501	struct dbg_cfg *dbg = &pinconf_dbg_conf;
	502	const struct pinctrl_map_configs *configs;
	503	char config[MAX_NAME_LEN+1];
f07512e6 LM	504	char buf[128];
	505	char *b = &buf[0];
	506	int buf_size;
	507	char *token;
	508	int i;
	509
	510	/* Get userspace string and assure termination */
9b680354	511	buf_size = min(count, (size_t)(sizeof(buf)-1));
f07512e6 LM	512	if (copy_from_user(buf, user_buf, buf_size))
	513	return -EFAULT;
	514	buf[buf_size] = 0;
	515
	516	/*
	517	* need to parse entry and extract parameters:
	518	* modify configs_pin devicename state pinname newvalue
	519	*/
	520
	521	/* Get arg: 'modify' */
	522	token = strsep(&b, " ");
	523	if (!token)
	524	return -EINVAL;
	525	if (strcmp(token, "modify"))
	526	return -EINVAL;
	527
	528	/* Get arg type: "config_pin" type supported so far */
	529	token = strsep(&b, " ");
	530	if (!token)
	531	return -EINVAL;
	532	if (strcmp(token, "config_pin"))
	533	return -EINVAL;
	534	dbg->map_type = PIN_MAP_TYPE_CONFIGS_PIN;
	535
	536	/* get arg 'device_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->dev_name, token, MAX_NAME_LEN);
	543
	544	/* get arg 'state_name' */
	545	token = strsep(&b, " ");
	546	if (token == NULL)
	547	return -EINVAL;
	548	if (strlen(token) >= MAX_NAME_LEN)
	549	return -EINVAL;
	550	strncpy(dbg->state_name, token, MAX_NAME_LEN);
	551
	552	/* get arg 'pin_name' */
	553	token = strsep(&b, " ");
	554	if (token == NULL)
	555	return -EINVAL;
	556	if (strlen(token) >= MAX_NAME_LEN)
	557	return -EINVAL;
	558	strncpy(dbg->pin_name, token, MAX_NAME_LEN);
	559
	560	/* get new_value of config' */
	561	token = strsep(&b, " ");
	562	if (token == NULL)
	563	return -EINVAL;
	564	if (strlen(token) >= MAX_NAME_LEN)
	565	return -EINVAL;
	566	strncpy(config, token, MAX_NAME_LEN);
	567
42fed7ba	568	mutex_lock(&pinctrl_maps_mutex);
f07512e6 LM	569
	570	/* Parse the pinctrl map and look for the selected dev/state/pin */
	571	for_each_maps(maps_node, i, map) {
	572	if (strcmp(map->dev_name, dbg->dev_name))
	573	continue;
	574	if (map->type != dbg->map_type)
	575	continue;
	576	if (strcmp(map->name, dbg->state_name))
	577	continue;
	578
	579	/* we found the right pin / state, so overwrite config */
	580	if (!strcmp(map->data.configs.group_or_pin, dbg->pin_name)) {
8a9dcc3f	581	found = map;
f07512e6 LM	582	break;
	583	}
	584	}
	585
	586	if (!found) {
f07512e6	587	count = -EINVAL;
cb6d315d	588	goto exit;
f07512e6 LM	589	}
f07512e6 LM	590
8a9dcc3f	591	pctldev = get_pinctrl_dev_from_devname(found->ctrl_dev_name);
f07512e6 LM	592	if (pctldev)
	593	confops = pctldev->desc->confops;
	594
	595	if (confops && confops->pin_config_dbg_parse_modify) {
8a9dcc3f	596	configs = &found->data.configs;
f07512e6 LM	597	for (i = 0; i < configs->num_configs; i++) {
	598	confops->pin_config_dbg_parse_modify(pctldev,
	599	config,
	600	&configs->configs[i]);
	601	}
	602	}
	603
	604	exit:
42fed7ba	605	mutex_unlock(&pinctrl_maps_mutex);
f07512e6 LM	606
	607	return count;
	608	}
	609
	610	static int pinconf_dbg_config_open(struct inode inode, struct file file)
	611	{
	612	return single_open(file, pinconf_dbg_config_print, inode->i_private);
	613	}
	614
	615	static const struct file_operations pinconf_dbg_pinconfig_fops = {
	616	.open = pinconf_dbg_config_open,
	617	.write = pinconf_dbg_config_write,
	618	.read = seq_read,
	619	.llseek = seq_lseek,
	620	.release = single_release,
	621	.owner = THIS_MODULE,
	622	};
	623
ae6b4d85 LW	624	void pinconf_init_device_debugfs(struct dentry *devroot,
	625	struct pinctrl_dev *pctldev)
	626	{
	627	debugfs_create_file("pinconf-pins", S_IFREG \| S_IRUGO,
	628	devroot, pctldev, &pinconf_pins_ops);
	629	debugfs_create_file("pinconf-groups", S_IFREG \| S_IRUGO,
	630	devroot, pctldev, &pinconf_groups_ops);
f07512e6 LM	631	debugfs_create_file("pinconf-config", (S_IRUGO \| S_IWUSR \| S_IWGRP),
f07512e6 LM	632	devroot, pctldev, &pinconf_dbg_pinconfig_fops);
ae6b4d85 LW	633	}
	634
	635	#endif