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

/*
 * Core driver for the generic 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) "generic 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/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/of.h>
#include "core.h"
#include "pinconf.h"
#include "pinctrl-utils.h"

#ifdef CONFIG_DEBUG_FS
static const struct pin_config_item conf_items[] = {
	PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL, false),
	PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL, false),
	PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL, false),
	PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL, false),
	PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
				"input bias pull to pin specific state", NULL, false),
	PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL, false),
	PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL, false),
	PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL, false),
	PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL, false),
	PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA", true),
	PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec", true),
	PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL, false),
	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL, false),
	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL, false),
	PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode", true),
	PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level", true),
	PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector", true),
	PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true),
};

static void pinconf_generic_dump_one(struct pinctrl_dev *pctldev,
				     struct seq_file *s, const char *gname,
				     unsigned pin,
				     const struct pin_config_item *items,
				     int nitems)
{
	int i;

	for (i = 0; i < nitems; i++) {
		unsigned long config;
		int ret;

		/* We want to check out this parameter */
		config = pinconf_to_config_packed(items[i].param, 0);
		if (gname)
			ret = pin_config_group_get(dev_name(pctldev->dev),
						   gname, &config);
		else
			ret = pin_config_get_for_pin(pctldev, pin, &config);
		/* These are legal errors */
		if (ret == -EINVAL || ret == -ENOTSUPP)
			continue;
		if (ret) {
			seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
			continue;
		}
		/* Space between multiple configs */
		seq_puts(s, " ");
		seq_puts(s, items[i].display);
		/* Print unit if available */
		if (items[i].has_arg) {
			seq_printf(s, " (%u",
				   pinconf_to_config_argument(config));
			if (items[i].format)
				seq_printf(s, " %s)", items[i].format);
			else
				seq_puts(s, ")");
		}
	}
}

/**
 * pinconf_generic_dump_pins - Print information about pin or group of pins
 * @pctldev:	Pincontrol device
 * @s:		File to print to
 * @gname:	Group name specifying pins
 * @pin:	Pin number specyfying pin
 *
 * Print the pinconf configuration for the requested pin(s) to @s. Pins can be
 * specified either by pin using @pin or by group using @gname. Only one needs
 * to be specified the other can be NULL/0.
 */
void pinconf_generic_dump_pins(struct pinctrl_dev *pctldev, struct seq_file *s,
			       const char *gname, unsigned pin)
{
	const struct pinconf_ops *ops = pctldev->desc->confops;

	if (!ops->is_generic)
		return;

	/* generic parameters */
	pinconf_generic_dump_one(pctldev, s, gname, pin, conf_items,
				 ARRAY_SIZE(conf_items));
	/* driver-specific parameters */
	if (pctldev->desc->num_custom_params &&
	    pctldev->desc->custom_conf_items)
		pinconf_generic_dump_one(pctldev, s, gname, pin,
					 pctldev->desc->custom_conf_items,
					 pctldev->desc->num_custom_params);
}

void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
				 struct seq_file *s, unsigned long config)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
		if (pinconf_to_config_param(config) != conf_items[i].param)
			continue;
		seq_printf(s, "%s: 0x%x", conf_items[i].display,
			   pinconf_to_config_argument(config));
	}

	if (!pctldev->desc->num_custom_params ||
	    !pctldev->desc->custom_conf_items)
		return;

	for (i = 0; i < pctldev->desc->num_custom_params; i++) {
		if (pinconf_to_config_param(config) !=
		    pctldev->desc->custom_conf_items[i].param)
			continue;
		seq_printf(s, "%s: 0x%x",
				pctldev->desc->custom_conf_items[i].display,
				pinconf_to_config_argument(config));
	}
}
EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
#endif

#ifdef CONFIG_OF
static const struct pinconf_generic_params dt_params[] = {
	{ "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
	{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
	{ "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
	{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
	{ "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
	{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
	{ "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
	{ "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
	{ "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
	{ "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
	{ "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
	{ "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
	{ "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
	{ "input-schmitt", PIN_CONFIG_INPUT_SCHMITT, 0 },
	{ "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
	{ "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
	{ "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 },
	{ "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 },
	{ "output-high", PIN_CONFIG_OUTPUT, 1, },
	{ "output-low", PIN_CONFIG_OUTPUT, 0, },
	{ "power-source", PIN_CONFIG_POWER_SOURCE, 0 },
	{ "slew-rate", PIN_CONFIG_SLEW_RATE, 0 },
};

/**
 * parse_dt_cfg() - Parse DT pinconf parameters
 * @np:	DT node
 * @params:	Array of describing generic parameters
 * @count:	Number of entries in @params
 * @cfg:	Array of parsed config options
 * @ncfg:	Number of entries in @cfg
 *
 * Parse the config options described in @params from @np and puts the result
 * in @cfg. @cfg does not need to be empty, entries are added beggining at
 * @ncfg. @ncfg is updated to reflect the number of entries after parsing. @cfg
 * needs to have enough memory allocated to hold all possible entries.
 */
static void parse_dt_cfg(struct device_node *np,
			 const struct pinconf_generic_params *params,
			 unsigned int count, unsigned long *cfg,
			 unsigned int *ncfg)
{
	int i;

	for (i = 0; i < count; i++) {
		u32 val;
		int ret;
		const struct pinconf_generic_params *par = &params[i];

		ret = of_property_read_u32(np, par->property, &val);

		/* property not found */
		if (ret == -EINVAL)
			continue;

		/* use default value, when no value is specified */
		if (ret)
			val = par->default_value;

		pr_debug("found %s with value %u\n", par->property, val);
		cfg[*ncfg] = pinconf_to_config_packed(par->param, val);
		(*ncfg)++;
	}
}

/**
 * pinconf_generic_parse_dt_config()
 * parse the config properties into generic pinconfig values.
 * @np: node containing the pinconfig properties
 * @configs: array with nconfigs entries containing the generic pinconf values
 *           must be freed when no longer necessary.
 * @nconfigs: umber of configurations
 */
int pinconf_generic_parse_dt_config(struct device_node *np,
				    struct pinctrl_dev *pctldev,
				    unsigned long **configs,
				    unsigned int *nconfigs)
{
	unsigned long *cfg;
	unsigned int max_cfg, ncfg = 0;
	int ret;

	if (!np)
		return -EINVAL;

	/* allocate a temporary array big enough to hold one of each option */
	max_cfg = ARRAY_SIZE(dt_params);
	if (pctldev)
		max_cfg += pctldev->desc->num_custom_params;
	cfg = kcalloc(max_cfg, sizeof(*cfg), GFP_KERNEL);
	if (!cfg)
		return -ENOMEM;

	parse_dt_cfg(np, dt_params, ARRAY_SIZE(dt_params), cfg, &ncfg);
	if (pctldev && pctldev->desc->num_custom_params &&
		pctldev->desc->custom_params)
		parse_dt_cfg(np, pctldev->desc->custom_params,
			     pctldev->desc->num_custom_params, cfg, &ncfg);

	ret = 0;

	/* no configs found at all */
	if (ncfg == 0) {
		*configs = NULL;
		*nconfigs = 0;
		goto out;
	}

	/*
	 * Now limit the number of configs to the real number of
	 * found properties.
	 */
	*configs = kmemdup(cfg, ncfg * sizeof(unsigned long), GFP_KERNEL);
	if (!*configs) {
		ret = -ENOMEM;
		goto out;
	}

	*nconfigs = ncfg;

out:
	kfree(cfg);
	return ret;
}

int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
		struct device_node *np, struct pinctrl_map **map,
		unsigned *reserved_maps, unsigned *num_maps,
		enum pinctrl_map_type type)
{
	int ret;
	const char *function;
	struct device *dev = pctldev->dev;
	unsigned long *configs = NULL;
	unsigned num_configs = 0;
	unsigned reserve, strings_count;
	struct property *prop;
	const char *group;
	const char *subnode_target_type = "pins";

	ret = of_property_count_strings(np, "pins");
	if (ret < 0) {
		ret = of_property_count_strings(np, "groups");
		if (ret < 0)
			/* skip this node; may contain config child nodes */
			return 0;
		if (type == PIN_MAP_TYPE_INVALID)
			type = PIN_MAP_TYPE_CONFIGS_GROUP;
		subnode_target_type = "groups";
	} else {
		if (type == PIN_MAP_TYPE_INVALID)
			type = PIN_MAP_TYPE_CONFIGS_PIN;
	}
	strings_count = ret;

	ret = of_property_read_string(np, "function", &function);
	if (ret < 0) {
		/* EINVAL=missing, which is fine since it's optional */
		if (ret != -EINVAL)
			dev_err(dev, "%s: could not parse property function\n",
				of_node_full_name(np));
		function = NULL;
	}

	ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
					      &num_configs);
	if (ret < 0) {
		dev_err(dev, "%s: could not parse node property\n",
			of_node_full_name(np));
		return ret;
	}

	reserve = 0;
	if (function != NULL)
		reserve++;
	if (num_configs)
		reserve++;

	reserve *= strings_count;

	ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
			num_maps, reserve);
	if (ret < 0)
		goto exit;

	of_property_for_each_string(np, subnode_target_type, prop, group) {
		if (function) {
			ret = pinctrl_utils_add_map_mux(pctldev, map,
					reserved_maps, num_maps, group,
					function);
			if (ret < 0)
				goto exit;
		}

		if (num_configs) {
			ret = pinctrl_utils_add_map_configs(pctldev, map,
					reserved_maps, num_maps, group, configs,
					num_configs, type);
			if (ret < 0)
				goto exit;
		}
	}
	ret = 0;

exit:
	kfree(configs);
	return ret;
}
EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map);

int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
		struct device_node *np_config, struct pinctrl_map **map,
		unsigned *num_maps, enum pinctrl_map_type type)
{
	unsigned reserved_maps;
	struct device_node *np;
	int ret;

	reserved_maps = 0;
	*map = NULL;
	*num_maps = 0;

	ret = pinconf_generic_dt_subnode_to_map(pctldev, np_config, map,
						&reserved_maps, num_maps, type);
	if (ret < 0)
		goto exit;

	for_each_child_of_node(np_config, np) {
		ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
					&reserved_maps, num_maps, type);
		if (ret < 0)
			goto exit;
	}
	return 0;

exit:
	pinctrl_utils_free_map(pctldev, *map, *num_maps);
	return ret;
}
EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map);

#endif
Commit	Line	Data
394349f7 LW	1	/*
	2	* Core driver for the generic 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
	12	#define pr_fmt(fmt) "generic pinconfig core: " fmt
	13
	14	#include <linux/kernel.h>
9cfd1724	15	#include <linux/module.h>
394349f7 LW	16	#include <linux/init.h>
	17	#include <linux/device.h>
	18	#include <linux/slab.h>
	19	#include <linux/debugfs.h>
	20	#include <linux/seq_file.h>
	21	#include <linux/pinctrl/pinctrl.h>
	22	#include <linux/pinctrl/pinconf.h>
	23	#include <linux/pinctrl/pinconf-generic.h>
7db9af4b	24	#include <linux/of.h>
394349f7 LW	25	#include "core.h"
394349f7 LW	26	#include "pinconf.h"
e81c8f18	27	#include "pinctrl-utils.h"
394349f7 LW	28
394349f7 LW	29	#ifdef CONFIG_DEBUG_FS
2500bcc9	30	static const struct pin_config_item conf_items[] = {
3c4b23dd	31	PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL, false),
eec45071 SB	32	PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL, false),
eec45071 SB	33	PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL, false),
eec45071	34	PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL, false),
7970cb77	35	PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
eec45071	36	"input bias pull to pin specific state", NULL, false),
3c4b23dd	37	PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL, false),
eec45071 SB	38	PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL, false),
eec45071 SB	39	PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL, false),
3c4b23dd	40	PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL, false),
eec45071	41	PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA", true),
3c4b23dd	42	PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec", true),
eec45071	43	PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL, false),
eec45071	44	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL, false),
3c4b23dd	45	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL, false),
eec45071 SB	46	PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode", true),
eec45071 SB	47	PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level", true),
3c4b23dd MY	48	PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector", true),
3c4b23dd MY	49	PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true),
394349f7 LW	50	};
394349f7 LW	51
dd4d01f7 SB	52	static void pinconf_generic_dump_one(struct pinctrl_dev *pctldev,
	53	struct seq_file s, const char gname,
	54	unsigned pin,
	55	const struct pin_config_item *items,
	56	int nitems)
394349f7	57	{
394349f7 LW	58	int i;
394349f7 LW	59
dd4d01f7	60	for (i = 0; i < nitems; i++) {
394349f7 LW	61	unsigned long config;
	62	int ret;
	63
	64	/* We want to check out this parameter */
dd4d01f7 SB	65	config = pinconf_to_config_packed(items[i].param, 0);
	66	if (gname)
	67	ret = pin_config_group_get(dev_name(pctldev->dev),
	68	gname, &config);
	69	else
	70	ret = pin_config_get_for_pin(pctldev, pin, &config);
394349f7 LW	71	/* These are legal errors */
	72	if (ret == -EINVAL \|\| ret == -ENOTSUPP)
	73	continue;
	74	if (ret) {
	75	seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
	76	continue;
	77	}
	78	/* Space between multiple configs */
	79	seq_puts(s, " ");
dd4d01f7	80	seq_puts(s, items[i].display);
394349f7	81	/* Print unit if available */
dd4d01f7	82	if (items[i].has_arg) {
eec45071 SB	83	seq_printf(s, " (%u",
eec45071 SB	84	pinconf_to_config_argument(config));
dd4d01f7 SB	85	if (items[i].format)
dd4d01f7 SB	86	seq_printf(s, " %s)", items[i].format);
eec45071 SB	87	else
	88	seq_puts(s, ")");
	89	}
394349f7 LW	90	}
	91	}
	92
dd4d01f7 SB	93	/**
	94	* pinconf_generic_dump_pins - Print information about pin or group of pins
	95	* @pctldev: Pincontrol device
	96	* @s: File to print to
	97	* @gname: Group name specifying pins
	98	* @pin: Pin number specyfying pin
	99	*
	100	* Print the pinconf configuration for the requested pin(s) to @s. Pins can be
	101	* specified either by pin using @pin or by group using @gname. Only one needs
	102	* to be specified the other can be NULL/0.
	103	*/
	104	void pinconf_generic_dump_pins(struct pinctrl_dev pctldev, struct seq_file s,
	105	const char *gname, unsigned pin)
394349f7 LW	106	{
394349f7 LW	107	const struct pinconf_ops *ops = pctldev->desc->confops;
394349f7 LW	108
	109	if (!ops->is_generic)
	110	return;
	111
dd4d01f7 SB	112	/* generic parameters */
	113	pinconf_generic_dump_one(pctldev, s, gname, pin, conf_items,
	114	ARRAY_SIZE(conf_items));
	115	/* driver-specific parameters */
f684e4ac LW	116	if (pctldev->desc->num_custom_params &&
f684e4ac LW	117	pctldev->desc->custom_conf_items)
dd4d01f7	118	pinconf_generic_dump_one(pctldev, s, gname, pin,
f684e4ac LW	119	pctldev->desc->custom_conf_items,
f684e4ac LW	120	pctldev->desc->num_custom_params);
394349f7 LW	121	}
394349f7 LW	122
9cfd1724 HZ	123	void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
	124	struct seq_file *s, unsigned long config)
	125	{
	126	int i;
	127
b6465424	128	for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
9cfd1724 HZ	129	if (pinconf_to_config_param(config) != conf_items[i].param)
	130	continue;
	131	seq_printf(s, "%s: 0x%x", conf_items[i].display,
	132	pinconf_to_config_argument(config));
	133	}
dd4d01f7	134
f684e4ac LW	135	if (!pctldev->desc->num_custom_params \|\|
f684e4ac LW	136	!pctldev->desc->custom_conf_items)
dd4d01f7 SB	137	return;
dd4d01f7 SB	138
f684e4ac LW	139	for (i = 0; i < pctldev->desc->num_custom_params; i++) {
	140	if (pinconf_to_config_param(config) !=
	141	pctldev->desc->custom_conf_items[i].param)
dd4d01f7	142	continue;
f684e4ac LW	143	seq_printf(s, "%s: 0x%x",
	144	pctldev->desc->custom_conf_items[i].display,
	145	pinconf_to_config_argument(config));
dd4d01f7	146	}
9cfd1724 HZ	147	}
9cfd1724 HZ	148	EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
394349f7	149	#endif
7db9af4b HS	150
7db9af4b HS	151	#ifdef CONFIG_OF
f684e4ac	152	static const struct pinconf_generic_params dt_params[] = {
3c4b23dd	153	{ "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
7db9af4b HS	154	{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
7db9af4b HS	155	{ "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
9ee1f7d2	156	{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
9ee1f7d2	157	{ "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
3c4b23dd	158	{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
7db9af4b HS	159	{ "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
7db9af4b HS	160	{ "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
3c4b23dd	161	{ "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
7db9af4b	162	{ "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
3c4b23dd	163	{ "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
8ba3f4d0	164	{ "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
3c4b23dd	165	{ "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
69c308e2	166	{ "input-schmitt", PIN_CONFIG_INPUT_SCHMITT, 0 },
7db9af4b	167	{ "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
3c4b23dd	168	{ "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
9ee1f7d2	169	{ "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 },
3c4b23dd	170	{ "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 },
7db9af4b	171	{ "output-high", PIN_CONFIG_OUTPUT, 1, },
3c4b23dd MY	172	{ "output-low", PIN_CONFIG_OUTPUT, 0, },
	173	{ "power-source", PIN_CONFIG_POWER_SOURCE, 0 },
	174	{ "slew-rate", PIN_CONFIG_SLEW_RATE, 0 },
7db9af4b HS	175	};
7db9af4b HS	176
dd4d01f7	177	/**
f684e4ac	178	* parse_dt_cfg() - Parse DT pinconf parameters
dd4d01f7	179	* @np: DT node
f684e4ac	180	* @params: Array of describing generic parameters
dd4d01f7 SB	181	* @count: Number of entries in @params
	182	* @cfg: Array of parsed config options
	183	* @ncfg: Number of entries in @cfg
	184	*
	185	* Parse the config options described in @params from @np and puts the result
	186	* in @cfg. @cfg does not need to be empty, entries are added beggining at
	187	* @ncfg. @ncfg is updated to reflect the number of entries after parsing. @cfg
	188	* needs to have enough memory allocated to hold all possible entries.
	189	*/
	190	static void parse_dt_cfg(struct device_node *np,
f684e4ac	191	const struct pinconf_generic_params *params,
dd4d01f7 SB	192	unsigned int count, unsigned long *cfg,
	193	unsigned int *ncfg)
	194	{
	195	int i;
	196
	197	for (i = 0; i < count; i++) {
	198	u32 val;
	199	int ret;
f684e4ac	200	const struct pinconf_generic_params *par = &params[i];
dd4d01f7 SB	201
	202	ret = of_property_read_u32(np, par->property, &val);
	203
	204	/* property not found */
	205	if (ret == -EINVAL)
	206	continue;
	207
	208	/* use default value, when no value is specified */
	209	if (ret)
	210	val = par->default_value;
	211
	212	pr_debug("found %s with value %u\n", par->property, val);
	213	cfg[*ncfg] = pinconf_to_config_packed(par->param, val);
	214	(*ncfg)++;
	215	}
	216	}
	217
7db9af4b HS	218	/**
	219	* pinconf_generic_parse_dt_config()
	220	* parse the config properties into generic pinconfig values.
	221	* @np: node containing the pinconfig properties
	222	* @configs: array with nconfigs entries containing the generic pinconf values
d9ac5e25	223	* must be freed when no longer necessary.
7db9af4b HS	224	* @nconfigs: umber of configurations
	225	*/
	226	int pinconf_generic_parse_dt_config(struct device_node *np,
dd4d01f7	227	struct pinctrl_dev *pctldev,
7db9af4b HS	228	unsigned long **configs,
	229	unsigned int *nconfigs)
	230	{
6abab2d4	231	unsigned long *cfg;
dd4d01f7	232	unsigned int max_cfg, ncfg = 0;
7db9af4b	233	int ret;
7db9af4b HS	234
	235	if (!np)
	236	return -EINVAL;
	237
6abab2d4	238	/* allocate a temporary array big enough to hold one of each option */
dd4d01f7 SB	239	max_cfg = ARRAY_SIZE(dt_params);
dd4d01f7 SB	240	if (pctldev)
f684e4ac	241	max_cfg += pctldev->desc->num_custom_params;
dd4d01f7	242	cfg = kcalloc(max_cfg, sizeof(*cfg), GFP_KERNEL);
6abab2d4 HS	243	if (!cfg)
	244	return -ENOMEM;
	245
dd4d01f7	246	parse_dt_cfg(np, dt_params, ARRAY_SIZE(dt_params), cfg, &ncfg);
f684e4ac LW	247	if (pctldev && pctldev->desc->num_custom_params &&
	248	pctldev->desc->custom_params)
	249	parse_dt_cfg(np, pctldev->desc->custom_params,
	250	pctldev->desc->num_custom_params, cfg, &ncfg);
7db9af4b	251
6abab2d4 HS	252	ret = 0;
6abab2d4 HS	253
e4a8844c HS	254	/* no configs found at all */
	255	if (ncfg == 0) {
	256	*configs = NULL;
	257	*nconfigs = 0;
6abab2d4	258	goto out;
e4a8844c HS	259	}
e4a8844c HS	260
7db9af4b HS	261	/*
	262	* Now limit the number of configs to the real number of
	263	* found properties.
	264	*/
db388dfb	265	configs = kmemdup(cfg, ncfg sizeof(unsigned long), GFP_KERNEL);
6abab2d4 HS	266	if (!*configs) {
	267	ret = -ENOMEM;
	268	goto out;
	269	}
7db9af4b	270
7db9af4b	271	*nconfigs = ncfg;
6abab2d4 HS	272
	273	out:
	274	kfree(cfg);
	275	return ret;
7db9af4b	276	}
e81c8f18 LD	277
	278	int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
	279	struct device_node np, struct pinctrl_map *map,
3287c240 LD	280	unsigned reserved_maps, unsigned num_maps,
3287c240 LD	281	enum pinctrl_map_type type)
e81c8f18 LD	282	{
	283	int ret;
	284	const char *function;
	285	struct device *dev = pctldev->dev;
	286	unsigned long *configs = NULL;
	287	unsigned num_configs = 0;
c7289500	288	unsigned reserve, strings_count;
e81c8f18 LD	289	struct property *prop;
e81c8f18 LD	290	const char *group;
31c89c95	291	const char *subnode_target_type = "pins";
e81c8f18	292
c7289500 BS	293	ret = of_property_count_strings(np, "pins");
	294	if (ret < 0) {
	295	ret = of_property_count_strings(np, "groups");
	296	if (ret < 0)
	297	/* skip this node; may contain config child nodes */
	298	return 0;
	299	if (type == PIN_MAP_TYPE_INVALID)
	300	type = PIN_MAP_TYPE_CONFIGS_GROUP;
	301	subnode_target_type = "groups";
	302	} else {
	303	if (type == PIN_MAP_TYPE_INVALID)
	304	type = PIN_MAP_TYPE_CONFIGS_PIN;
	305	}
	306	strings_count = ret;
	307
e81c8f18 LD	308	ret = of_property_read_string(np, "function", &function);
	309	if (ret < 0) {
	310	/* EINVAL=missing, which is fine since it's optional */
	311	if (ret != -EINVAL)
4024efb4 BS	312	dev_err(dev, "%s: could not parse property function\n",
4024efb4 BS	313	of_node_full_name(np));
e81c8f18 LD	314	function = NULL;
	315	}
	316
dd4d01f7 SB	317	ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
dd4d01f7 SB	318	&num_configs);
e81c8f18	319	if (ret < 0) {
4024efb4 BS	320	dev_err(dev, "%s: could not parse node property\n",
4024efb4 BS	321	of_node_full_name(np));
e81c8f18 LD	322	return ret;
	323	}
	324
	325	reserve = 0;
	326	if (function != NULL)
	327	reserve++;
	328	if (num_configs)
	329	reserve++;
31c89c95	330
c7289500	331	reserve *= strings_count;
e81c8f18 LD	332
	333	ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
	334	num_maps, reserve);
	335	if (ret < 0)
	336	goto exit;
	337
31c89c95	338	of_property_for_each_string(np, subnode_target_type, prop, group) {
e81c8f18 LD	339	if (function) {
	340	ret = pinctrl_utils_add_map_mux(pctldev, map,
	341	reserved_maps, num_maps, group,
	342	function);
	343	if (ret < 0)
	344	goto exit;
	345	}
	346
	347	if (num_configs) {
	348	ret = pinctrl_utils_add_map_configs(pctldev, map,
	349	reserved_maps, num_maps, group, configs,
3287c240	350	num_configs, type);
e81c8f18 LD	351	if (ret < 0)
	352	goto exit;
	353	}
	354	}
	355	ret = 0;
	356
	357	exit:
	358	kfree(configs);
	359	return ret;
	360	}
	361	EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map);
	362
	363	int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
	364	struct device_node np_config, struct pinctrl_map *map,
3287c240	365	unsigned *num_maps, enum pinctrl_map_type type)
e81c8f18 LD	366	{
	367	unsigned reserved_maps;
	368	struct device_node *np;
	369	int ret;
	370
	371	reserved_maps = 0;
	372	*map = NULL;
	373	*num_maps = 0;
	374
c7289500 BS	375	ret = pinconf_generic_dt_subnode_to_map(pctldev, np_config, map,
	376	&reserved_maps, num_maps, type);
	377	if (ret < 0)
	378	goto exit;
	379
e81c8f18 LD	380	for_each_child_of_node(np_config, np) {
e81c8f18 LD	381	ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
3287c240	382	&reserved_maps, num_maps, type);
c7289500 BS	383	if (ret < 0)
c7289500 BS	384	goto exit;
e81c8f18 LD	385	}
e81c8f18 LD	386	return 0;
c7289500 BS	387
c7289500 BS	388	exit:
d32f7fd3	389	pinctrl_utils_free_map(pctldev, map, num_maps);
c7289500	390	return ret;
e81c8f18 LD	391	}
	392	EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map);
	393
7db9af4b	394	#endif