[mirror_ubuntu-artful-kernel.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"

#ifdef CONFIG_DEBUG_FS

struct pin_config_item {
	const enum pin_config_param param;
	const char * const display;
	const char * const format;
};

#define PCONFDUMP(a, b, c) { .param = a, .display = b, .format = c }

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

void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev,
			      struct seq_file *s, unsigned pin)
{
	const struct pinconf_ops *ops = pctldev->desc->confops;
	int i;

	if (!ops->is_generic)
		return;

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

		/* We want to check out this parameter */
		config = pinconf_to_config_packed(conf_items[i].param, 0);
		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, conf_items[i].display);
		/* Print unit if available */
		if (conf_items[i].format &&
		    pinconf_to_config_argument(config) != 0)
			seq_printf(s, " (%u %s)",
				   pinconf_to_config_argument(config),
				   conf_items[i].format);
	}
}

void pinconf_generic_dump_group(struct pinctrl_dev *pctldev,
			      struct seq_file *s, const char *gname)
{
	const struct pinconf_ops *ops = pctldev->desc->confops;
	int i;

	if (!ops->is_generic)
		return;

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

		/* We want to check out this parameter */
		config = pinconf_to_config_packed(conf_items[i].param, 0);
		ret = pin_config_group_get(dev_name(pctldev->dev), gname,
					   &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, conf_items[i].display);
		/* Print unit if available */
		if (conf_items[i].format && config != 0)
			seq_printf(s, " (%u %s)",
				   pinconf_to_config_argument(config),
				   conf_items[i].format);
	}
}

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));
	}
}
EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
#endif

#ifdef CONFIG_OF
struct pinconf_generic_dt_params {
	const char * const property;
	enum pin_config_param param;
	u32 default_value;
};

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

/**
 * 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
 * @nconfigs: umber of configurations
 */
int pinconf_generic_parse_dt_config(struct device_node *np,
				    unsigned long **configs,
				    unsigned int *nconfigs)
{
	unsigned long cfg[ARRAY_SIZE(dt_params)];
	unsigned int ncfg = 0;
	int ret;
	int i;
	u32 val;

	if (!np)
		return -EINVAL;

	for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
		struct pinconf_generic_dt_params *par = &dt_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++;
	}

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

	/*
	 * Now limit the number of configs to the real number of
	 * found properties.
	 */
	*configs = kzalloc(ncfg * sizeof(unsigned long), GFP_KERNEL);
	if (!*configs)
		return -ENOMEM;

	memcpy(*configs, &cfg, ncfg * sizeof(unsigned long));
	*nconfigs = ncfg;
	return 0;
}
#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"
	26	#include "pinconf.h"
	27
	28	#ifdef CONFIG_DEBUG_FS
	29
	30	struct pin_config_item {
	31	const enum pin_config_param param;
	32	const char * const display;
	33	const char * const format;
	34	};
	35
	36	#define PCONFDUMP(a, b, c) { .param = a, .display = b, .format = c }
	37
1ef465c0	38	static struct pin_config_item conf_items[] = {
394349f7 LW	39	PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL),
394349f7 LW	40	PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL),
a2df4269	41	PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL),
394349f7 LW	42	PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL),
394349f7 LW	43	PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL),
7970cb77 HS	44	PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
7970cb77 HS	45	"input bias pull to pin specific state", NULL),
394349f7 LW	46	PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL),
	47	PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL),
	48	PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL),
73ae368c	49	PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA"),
ea27c396	50	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL),
394349f7 LW	51	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL),
	52	PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "time units"),
	53	PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector"),
684697cb	54	PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL),
394349f7	55	PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode"),
483f33f6	56	PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level"),
394349f7 LW	57	};
	58
	59	void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev,
	60	struct seq_file *s, unsigned pin)
	61	{
	62	const struct pinconf_ops *ops = pctldev->desc->confops;
	63	int i;
	64
	65	if (!ops->is_generic)
	66	return;
	67
b6465424	68	for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
394349f7 LW	69	unsigned long config;
	70	int ret;
	71
	72	/* We want to check out this parameter */
	73	config = pinconf_to_config_packed(conf_items[i].param, 0);
	74	ret = pin_config_get_for_pin(pctldev, pin, &config);
	75	/* These are legal errors */
	76	if (ret == -EINVAL \|\| ret == -ENOTSUPP)
	77	continue;
	78	if (ret) {
	79	seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
	80	continue;
	81	}
	82	/* Space between multiple configs */
	83	seq_puts(s, " ");
	84	seq_puts(s, conf_items[i].display);
	85	/* Print unit if available */
	86	if (conf_items[i].format &&
	87	pinconf_to_config_argument(config) != 0)
	88	seq_printf(s, " (%u %s)",
	89	pinconf_to_config_argument(config),
	90	conf_items[i].format);
	91	}
	92	}
	93
	94	void pinconf_generic_dump_group(struct pinctrl_dev *pctldev,
	95	struct seq_file s, const char gname)
	96	{
	97	const struct pinconf_ops *ops = pctldev->desc->confops;
	98	int i;
	99
	100	if (!ops->is_generic)
	101	return;
	102
b6465424	103	for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
394349f7 LW	104	unsigned long config;
	105	int ret;
	106
	107	/* We want to check out this parameter */
	108	config = pinconf_to_config_packed(conf_items[i].param, 0);
	109	ret = pin_config_group_get(dev_name(pctldev->dev), gname,
	110	&config);
	111	/* These are legal errors */
	112	if (ret == -EINVAL \|\| ret == -ENOTSUPP)
	113	continue;
	114	if (ret) {
	115	seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
	116	continue;
	117	}
	118	/* Space between multiple configs */
	119	seq_puts(s, " ");
	120	seq_puts(s, conf_items[i].display);
	121	/* Print unit if available */
	122	if (conf_items[i].format && config != 0)
	123	seq_printf(s, " (%u %s)",
	124	pinconf_to_config_argument(config),
	125	conf_items[i].format);
	126	}
	127	}
	128
9cfd1724 HZ	129	void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
	130	struct seq_file *s, unsigned long config)
	131	{
	132	int i;
	133
b6465424	134	for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
9cfd1724 HZ	135	if (pinconf_to_config_param(config) != conf_items[i].param)
	136	continue;
	137	seq_printf(s, "%s: 0x%x", conf_items[i].display,
	138	pinconf_to_config_argument(config));
	139	}
	140	}
	141	EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
394349f7	142	#endif
7db9af4b HS	143
	144	#ifdef CONFIG_OF
	145	struct pinconf_generic_dt_params {
	146	const char * const property;
	147	enum pin_config_param param;
	148	u32 default_value;
	149	};
	150
	151	static struct pinconf_generic_dt_params dt_params[] = {
	152	{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
	153	{ "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
	154	{ "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
9ee1f7d2 HS	155	{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
	156	{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
	157	{ "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
7db9af4b HS	158	{ "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
	159	{ "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
	160	{ "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
	161	{ "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
	162	{ "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
	163	{ "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
	164	{ "input-schmitt", PIN_CONFIG_INPUT_SCHMITT, 0 },
	165	{ "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
	166	{ "power-source", PIN_CONFIG_POWER_SOURCE, 0 },
	167	{ "slew-rate", PIN_CONFIG_SLEW_RATE, 0 },
9ee1f7d2 HS	168	{ "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 },
9ee1f7d2 HS	169	{ "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 },
7db9af4b HS	170	{ "output-low", PIN_CONFIG_OUTPUT, 0, },
	171	{ "output-high", PIN_CONFIG_OUTPUT, 1, },
	172	};
	173
	174	/**
	175	* pinconf_generic_parse_dt_config()
	176	* parse the config properties into generic pinconfig values.
	177	* @np: node containing the pinconfig properties
	178	* @configs: array with nconfigs entries containing the generic pinconf values
	179	* @nconfigs: umber of configurations
	180	*/
	181	int pinconf_generic_parse_dt_config(struct device_node *np,
	182	unsigned long **configs,
	183	unsigned int *nconfigs)
	184	{
	185	unsigned long cfg[ARRAY_SIZE(dt_params)];
	186	unsigned int ncfg = 0;
	187	int ret;
	188	int i;
	189	u32 val;
	190
	191	if (!np)
	192	return -EINVAL;
	193
	194	for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
	195	struct pinconf_generic_dt_params *par = &dt_params[i];
	196	ret = of_property_read_u32(np, par->property, &val);
	197
	198	/* property not found */
	199	if (ret == -EINVAL)
	200	continue;
	201
	202	/* use default value, when no value is specified */
	203	if (ret)
	204	val = par->default_value;
	205
	206	pr_debug("found %s with value %u\n", par->property, val);
	207	cfg[ncfg] = pinconf_to_config_packed(par->param, val);
	208	ncfg++;
	209	}
	210
e4a8844c HS	211	/* no configs found at all */
	212	if (ncfg == 0) {
	213	*configs = NULL;
	214	*nconfigs = 0;
	215	return 0;
	216	}
	217
7db9af4b HS	218	/*
	219	* Now limit the number of configs to the real number of
	220	* found properties.
	221	*/
	222	configs = kzalloc(ncfg sizeof(unsigned long), GFP_KERNEL);
	223	if (!*configs)
	224	return -ENOMEM;
	225
	226	memcpy(configs, &cfg, ncfg sizeof(unsigned long));
	227	*nconfigs = ncfg;
	228	return 0;
	229	}
	230	#endif