[deliverable/linux.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 i, 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;
		}
		for (i = 0; i < setting->data.configs.num_configs; i++) {
			ret = ops->pin_config_set(pctldev,
					setting->data.configs.group_or_pin,
					setting->data.configs.configs[i]);
			if (ret < 0) {
				dev_err(pctldev->dev,
					"pin_config_set op failed for pin %d config %08lx\n",
					setting->data.configs.group_or_pin,
					setting->data.configs.configs[i]);
				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;
		}
		for (i = 0; i < setting->data.configs.num_configs; i++) {
			ret = ops->pin_config_group_set(pctldev,
					setting->data.configs.group_or_pin,
					setting->data.configs.configs[i]);
			if (ret < 0) {
				dev_err(pctldev->dev,
					"pin_config_group_set op failed for group %d config %08lx\n",
					setting->data.configs.group_or_pin,
					setting->data.configs.configs[i]);
				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;
	struct pinctrl_dev *pctldev = NULL;
	const struct pinconf_ops *confops = NULL;
	const struct pinctrl_map_configs *configs;
	struct dbg_cfg *dbg = &pinconf_dbg_conf;
	int i, j;
	bool found = false;
	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, read the
				 * config and he pctldev for later use
				 */
				configs = &map->data.configs;
				pctldev = get_pinctrl_dev_from_devname
					(map->ctrl_dev_name);
				found = true;
				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;
	}

	config = *(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;
	struct pinctrl_dev *pctldev = NULL;
	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];
	bool found = false;
	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" 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 = true;
			pctldev = get_pinctrl_dev_from_devname(
					map->ctrl_dev_name);
			configs = &map->data.configs;
			break;
		}
	}

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

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

	if (confops && confops->pin_config_dbg_parse_modify) {
		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;
	161	int i, ret;
	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	}
	174	for (i = 0; i < setting->data.configs.num_configs; i++) {
	175	ret = ops->pin_config_set(pctldev,
	176	setting->data.configs.group_or_pin,
	177	setting->data.configs.configs[i]);
	178	if (ret < 0) {
	179	dev_err(pctldev->dev,
	180	"pin_config_set op failed for pin %d config %08lx\n",
	181	setting->data.configs.group_or_pin,
	182	setting->data.configs.configs[i]);
	183	return ret;
	184	}
	185	}
	186	break;
	187	case PIN_MAP_TYPE_CONFIGS_GROUP:
	188	if (!ops->pin_config_group_set) {
	189	dev_err(pctldev->dev,
	190	"missing pin_config_group_set op\n");
	191	return -EINVAL;
	192	}
	193	for (i = 0; i < setting->data.configs.num_configs; i++) {
	194	ret = ops->pin_config_group_set(pctldev,
	195	setting->data.configs.group_or_pin,
	196	setting->data.configs.configs[i]);
	197	if (ret < 0) {
	198	dev_err(pctldev->dev,
	199	"pin_config_group_set op failed for group %d config %08lx\n",
	200	setting->data.configs.group_or_pin,
	201	setting->data.configs.configs[i]);
	202	return ret;
	203	}
	204	}
	205	break;
206	default:
207	return -EINVAL;
208	}
209
210	return 0;
211	}
212
ae6b4d85 LW	213	#ifdef CONFIG_DEBUG_FS
ae6b4d85 LW	214
1e2082b5 SW	215	void pinconf_show_map(struct seq_file s, struct pinctrl_map const map)
1e2082b5 SW	216	{
6cb41587 SW	217	struct pinctrl_dev *pctldev;
6cb41587 SW	218	const struct pinconf_ops *confops;
1e2082b5 SW	219	int i;
1e2082b5 SW	220
6cb41587 SW	221	pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name);
	222	if (pctldev)
	223	confops = pctldev->desc->confops;
	224	else
	225	confops = NULL;
	226
1e2082b5 SW	227	switch (map->type) {
	228	case PIN_MAP_TYPE_CONFIGS_PIN:
	229	seq_printf(s, "pin ");
	230	break;
	231	case PIN_MAP_TYPE_CONFIGS_GROUP:
	232	seq_printf(s, "group ");
	233	break;
	234	default:
	235	break;
	236	}
	237
	238	seq_printf(s, "%s\n", map->data.configs.group_or_pin);
	239
6cb41587 SW	240	for (i = 0; i < map->data.configs.num_configs; i++) {
	241	seq_printf(s, "config ");
	242	if (confops && confops->pin_config_config_dbg_show)
	243	confops->pin_config_config_dbg_show(pctldev, s,
	244	map->data.configs.configs[i]);
	245	else
	246	seq_printf(s, "%08lx", map->data.configs.configs[i]);
	247	seq_printf(s, "\n");
	248	}
1e2082b5 SW	249	}
	250
	251	void pinconf_show_setting(struct seq_file *s,
	252	struct pinctrl_setting const *setting)
	253	{
	254	struct pinctrl_dev *pctldev = setting->pctldev;
	255	const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
6cb41587	256	const struct pinconf_ops *confops = pctldev->desc->confops;
1e2082b5 SW	257	struct pin_desc *desc;
	258	int i;
	259
	260	switch (setting->type) {
	261	case PIN_MAP_TYPE_CONFIGS_PIN:
	262	desc = pin_desc_get(setting->pctldev,
	263	setting->data.configs.group_or_pin);
	264	seq_printf(s, "pin %s (%d)",
	265	desc->name ? desc->name : "unnamed",
	266	setting->data.configs.group_or_pin);
	267	break;
	268	case PIN_MAP_TYPE_CONFIGS_GROUP:
	269	seq_printf(s, "group %s (%d)",
	270	pctlops->get_group_name(pctldev,
	271	setting->data.configs.group_or_pin),
	272	setting->data.configs.group_or_pin);
	273	break;
	274	default:
	275	break;
	276	}
	277
	278	/*
	279	* FIXME: We should really get the pin controler to dump the config
	280	* values, so they can be decoded to something meaningful.
	281	*/
6cb41587 SW	282	for (i = 0; i < setting->data.configs.num_configs; i++) {
	283	seq_printf(s, " ");
	284	if (confops && confops->pin_config_config_dbg_show)
	285	confops->pin_config_config_dbg_show(pctldev, s,
	286	setting->data.configs.configs[i]);
	287	else
	288	seq_printf(s, "%08lx",
	289	setting->data.configs.configs[i]);
	290	}
1e2082b5 SW	291
	292	seq_printf(s, "\n");
	293	}
	294
ae6b4d85 LW	295	static void pinconf_dump_pin(struct pinctrl_dev *pctldev,
	296	struct seq_file *s, int pin)
	297	{
	298	const struct pinconf_ops *ops = pctldev->desc->confops;
	299
394349f7 LW	300	/* no-op when not using generic pin config */
394349f7 LW	301	pinconf_generic_dump_pin(pctldev, s, pin);
ae6b4d85 LW	302	if (ops && ops->pin_config_dbg_show)
	303	ops->pin_config_dbg_show(pctldev, s, pin);
	304	}
	305
	306	static int pinconf_pins_show(struct seq_file s, void what)
	307	{
	308	struct pinctrl_dev *pctldev = s->private;
ad8bb720	309	const struct pinconf_ops *ops = pctldev->desc->confops;
706e8520	310	unsigned i, pin;
ae6b4d85	311
ad8bb720 DA	312	if (!ops \|\| !ops->pin_config_get)
	313	return 0;
	314
ae6b4d85	315	seq_puts(s, "Pin config settings per pin\n");
2aeefe02	316	seq_puts(s, "Format: pin (name): configs\n");
ae6b4d85	317
42fed7ba	318	mutex_lock(&pctldev->mutex);
57b676f9	319
706e8520	320	/* The pin number can be retrived from the pin controller descriptor */
546edd83	321	for (i = 0; i < pctldev->desc->npins; i++) {
ae6b4d85 LW	322	struct pin_desc *desc;
ae6b4d85 LW	323
706e8520	324	pin = pctldev->desc->pins[i].number;
ae6b4d85	325	desc = pin_desc_get(pctldev, pin);
706e8520	326	/* Skip if we cannot search the pin */
ae6b4d85 LW	327	if (desc == NULL)
	328	continue;
	329
	330	seq_printf(s, "pin %d (%s):", pin,
	331	desc->name ? desc->name : "unnamed");
	332
	333	pinconf_dump_pin(pctldev, s, pin);
	334
	335	seq_printf(s, "\n");
	336	}
	337
42fed7ba	338	mutex_unlock(&pctldev->mutex);
57b676f9	339
ae6b4d85 LW	340	return 0;
	341	}
	342
	343	static void pinconf_dump_group(struct pinctrl_dev *pctldev,
	344	struct seq_file *s, unsigned selector,
	345	const char *gname)
	346	{
	347	const struct pinconf_ops *ops = pctldev->desc->confops;
	348
394349f7 LW	349	/* no-op when not using generic pin config */
394349f7 LW	350	pinconf_generic_dump_group(pctldev, s, gname);
ae6b4d85 LW	351	if (ops && ops->pin_config_group_dbg_show)
	352	ops->pin_config_group_dbg_show(pctldev, s, selector);
	353	}
	354
	355	static int pinconf_groups_show(struct seq_file s, void what)
	356	{
	357	struct pinctrl_dev *pctldev = s->private;
	358	const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
	359	const struct pinconf_ops *ops = pctldev->desc->confops;
d1e90e9e	360	unsigned ngroups = pctlops->get_groups_count(pctldev);
ae6b4d85 LW	361	unsigned selector = 0;
	362
	363	if (!ops \|\| !ops->pin_config_group_get)
	364	return 0;
	365
	366	seq_puts(s, "Pin config settings per pin group\n");
2aeefe02	367	seq_puts(s, "Format: group (name): configs\n");
ae6b4d85	368
d1e90e9e	369	while (selector < ngroups) {
ae6b4d85 LW	370	const char *gname = pctlops->get_group_name(pctldev, selector);
	371
	372	seq_printf(s, "%u (%s):", selector, gname);
	373	pinconf_dump_group(pctldev, s, selector, gname);
f7b9006f SW	374	seq_printf(s, "\n");
f7b9006f SW	375
ae6b4d85 LW	376	selector++;
	377	}
	378
	379	return 0;
	380	}
	381
	382	static int pinconf_pins_open(struct inode inode, struct file file)
	383	{
	384	return single_open(file, pinconf_pins_show, inode->i_private);
	385	}
	386
	387	static int pinconf_groups_open(struct inode inode, struct file file)
	388	{
	389	return single_open(file, pinconf_groups_show, inode->i_private);
	390	}
	391
	392	static const struct file_operations pinconf_pins_ops = {
	393	.open = pinconf_pins_open,
	394	.read = seq_read,
	395	.llseek = seq_lseek,
	396	.release = single_release,
	397	};
	398
	399	static const struct file_operations pinconf_groups_ops = {
	400	.open = pinconf_groups_open,
	401	.read = seq_read,
	402	.llseek = seq_lseek,
	403	.release = single_release,
	404	};
	405
f07512e6 LM	406	#define MAX_NAME_LEN 15
	407
	408	struct dbg_cfg {
	409	enum pinctrl_map_type map_type;
	410	char dev_name[MAX_NAME_LEN+1];
	411	char state_name[MAX_NAME_LEN+1];
	412	char pin_name[MAX_NAME_LEN+1];
	413	};
	414
	415	/*
	416	* Goal is to keep this structure as global in order to simply read the
	417	* pinconf-config file after a write to check config is as expected
	418	*/
	419	static struct dbg_cfg pinconf_dbg_conf;
	420
	421	/**
	422	* pinconf_dbg_config_print() - display the pinctrl config from the pinctrl
	423	* map, of the dev/pin/state that was last written to pinconf-config file.
	424	* @s: string filled in with config description
	425	* @d: not used
	426	*/
	427	static int pinconf_dbg_config_print(struct seq_file s, void d)
	428	{
	429	struct pinctrl_maps *maps_node;
	430	const struct pinctrl_map *map;
	431	struct pinctrl_dev *pctldev = NULL;
	432	const struct pinconf_ops *confops = NULL;
	433	const struct pinctrl_map_configs *configs;
	434	struct dbg_cfg *dbg = &pinconf_dbg_conf;
	435	int i, j;
	436	bool found = false;
	437	unsigned long config;
	438
a386267a	439	mutex_lock(&pinctrl_maps_mutex);
f07512e6 LM	440
	441	/* Parse the pinctrl map and look for the elected pin/state */
	442	for_each_maps(maps_node, i, map) {
	443	if (map->type != dbg->map_type)
	444	continue;
	445	if (strcmp(map->dev_name, dbg->dev_name))
	446	continue;
	447	if (strcmp(map->name, dbg->state_name))
	448	continue;
	449
	450	for (j = 0; j < map->data.configs.num_configs; j++) {
	451	if (!strcmp(map->data.configs.group_or_pin,
	452	dbg->pin_name)) {
	453	/*
	454	* We found the right pin / state, read the
	455	* config and he pctldev for later use
	456	*/
	457	configs = &map->data.configs;
	458	pctldev = get_pinctrl_dev_from_devname
	459	(map->ctrl_dev_name);
	460	found = true;
	461	break;
	462	}
	463	}
	464	}
	465
	466	if (!found) {
	467	seq_printf(s, "No config found for dev/state/pin, expected:\n");
	468	seq_printf(s, "Searched dev:%s\n", dbg->dev_name);
	469	seq_printf(s, "Searched state:%s\n", dbg->state_name);
	470	seq_printf(s, "Searched pin:%s\n", dbg->pin_name);
	471	seq_printf(s, "Use: modify config_pin <devname> "\
	472	"<state> <pinname> <value>\n");
	473	goto exit;
	474	}
	475
	476	config = *(configs->configs);
	477	seq_printf(s, "Dev %s has config of %s in state %s: 0x%08lX\n",
	478	dbg->dev_name, dbg->pin_name,
	479	dbg->state_name, config);
	480
	481	if (pctldev)
	482	confops = pctldev->desc->confops;
	483
	484	if (confops && confops->pin_config_config_dbg_show)
	485	confops->pin_config_config_dbg_show(pctldev, s, config);
	486
	487	exit:
a386267a	488	mutex_unlock(&pinctrl_maps_mutex);
f07512e6 LM	489
	490	return 0;
	491	}
	492
	493	/**
	494	* pinconf_dbg_config_write() - modify the pinctrl config in the pinctrl
	495	* map, of a dev/pin/state entry based on user entries to pinconf-config
	496	* @user_buf: contains the modification request with expected format:
	497	* modify config_pin <devicename> <state> <pinname> <newvalue>
	498	* modify is literal string, alternatives like add/delete not supported yet
	499	* config_pin is literal, alternatives like config_mux not supported yet
	500	* <devicename> <state> <pinname> are values that should match the pinctrl-maps
	501	* <newvalue> reflects the new config and is driver dependant
	502	*/
	503	static int pinconf_dbg_config_write(struct file *file,
	504	const char __user user_buf, size_t count, loff_t ppos)
	505	{
	506	struct pinctrl_maps *maps_node;
	507	const struct pinctrl_map *map;
	508	struct pinctrl_dev *pctldev = NULL;
	509	const struct pinconf_ops *confops = NULL;
	510	struct dbg_cfg *dbg = &pinconf_dbg_conf;
	511	const struct pinctrl_map_configs *configs;
	512	char config[MAX_NAME_LEN+1];
	513	bool found = false;
	514	char buf[128];
	515	char *b = &buf[0];
	516	int buf_size;
	517	char *token;
	518	int i;
	519
	520	/* Get userspace string and assure termination */
	521	buf_size = min(count, (sizeof(buf)-1));
	522	if (copy_from_user(buf, user_buf, buf_size))
	523	return -EFAULT;
	524	buf[buf_size] = 0;
	525
	526	/*
	527	* need to parse entry and extract parameters:
	528	* modify configs_pin devicename state pinname newvalue
	529	*/
	530
	531	/* Get arg: 'modify' */
	532	token = strsep(&b, " ");
	533	if (!token)
	534	return -EINVAL;
	535	if (strcmp(token, "modify"))
	536	return -EINVAL;
	537
	538	/* Get arg type: "config_pin" type supported so far */
	539	token = strsep(&b, " ");
	540	if (!token)
	541	return -EINVAL;
	542	if (strcmp(token, "config_pin"))
	543	return -EINVAL;
	544	dbg->map_type = PIN_MAP_TYPE_CONFIGS_PIN;
	545
	546	/* get arg 'device_name' */
	547	token = strsep(&b, " ");
	548	if (token == NULL)
	549	return -EINVAL;
	550	if (strlen(token) >= MAX_NAME_LEN)
	551	return -EINVAL;
	552	strncpy(dbg->dev_name, token, MAX_NAME_LEN);
553
554	/* get arg 'state_name' */
555	token = strsep(&b, " ");
556	if (token == NULL)
557	return -EINVAL;
558	if (strlen(token) >= MAX_NAME_LEN)
559	return -EINVAL;
560	strncpy(dbg->state_name, token, MAX_NAME_LEN);
561
562	/* get arg 'pin_name' */
563	token = strsep(&b, " ");
564	if (token == NULL)
565	return -EINVAL;
566	if (strlen(token) >= MAX_NAME_LEN)
567	return -EINVAL;
568	strncpy(dbg->pin_name, token, MAX_NAME_LEN);
569
570	/* get new_value of config' */
571	token = strsep(&b, " ");
572	if (token == NULL)
573	return -EINVAL;
574	if (strlen(token) >= MAX_NAME_LEN)
575	return -EINVAL;
576	strncpy(config, token, MAX_NAME_LEN);
577
42fed7ba	578	mutex_lock(&pinctrl_maps_mutex);
f07512e6 LM	579
	580	/* Parse the pinctrl map and look for the selected dev/state/pin */
	581	for_each_maps(maps_node, i, map) {
	582	if (strcmp(map->dev_name, dbg->dev_name))
	583	continue;
	584	if (map->type != dbg->map_type)
	585	continue;
	586	if (strcmp(map->name, dbg->state_name))
	587	continue;
	588
	589	/* we found the right pin / state, so overwrite config */
	590	if (!strcmp(map->data.configs.group_or_pin, dbg->pin_name)) {
	591	found = true;
	592	pctldev = get_pinctrl_dev_from_devname(
	593	map->ctrl_dev_name);
	594	configs = &map->data.configs;
	595	break;
	596	}
	597	}
	598
	599	if (!found) {
f07512e6	600	count = -EINVAL;
cb6d315d	601	goto exit;
f07512e6 LM	602	}
	603
	604	if (pctldev)
	605	confops = pctldev->desc->confops;
	606
	607	if (confops && confops->pin_config_dbg_parse_modify) {
	608	for (i = 0; i < configs->num_configs; i++) {
	609	confops->pin_config_dbg_parse_modify(pctldev,
	610	config,
	611	&configs->configs[i]);
	612	}
	613	}
	614
	615	exit:
42fed7ba	616	mutex_unlock(&pinctrl_maps_mutex);
f07512e6 LM	617
	618	return count;
	619	}
	620
	621	static int pinconf_dbg_config_open(struct inode inode, struct file file)
	622	{
	623	return single_open(file, pinconf_dbg_config_print, inode->i_private);
	624	}
	625
	626	static const struct file_operations pinconf_dbg_pinconfig_fops = {
	627	.open = pinconf_dbg_config_open,
	628	.write = pinconf_dbg_config_write,
	629	.read = seq_read,
	630	.llseek = seq_lseek,
	631	.release = single_release,
	632	.owner = THIS_MODULE,
	633	};
	634
ae6b4d85 LW	635	void pinconf_init_device_debugfs(struct dentry *devroot,
	636	struct pinctrl_dev *pctldev)
	637	{
	638	debugfs_create_file("pinconf-pins", S_IFREG \| S_IRUGO,
	639	devroot, pctldev, &pinconf_pins_ops);
	640	debugfs_create_file("pinconf-groups", S_IFREG \| S_IRUGO,
	641	devroot, pctldev, &pinconf_groups_ops);
f07512e6 LM	642	debugfs_create_file("pinconf-config", (S_IRUGO \| S_IWUSR \| S_IWGRP),
f07512e6 LM	643	devroot, pctldev, &pinconf_dbg_pinconfig_fops);
ae6b4d85 LW	644	}
	645
	646	#endif