[mirror_ubuntu-artful-kernel.git] / drivers / mfd / rn5t618.c

/*
 * MFD core driver for Ricoh RN5T618 PMIC
 *
 * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
 * Copyright (C) 2016 Toradex AG
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/mfd/core.h>
#include <linux/mfd/rn5t618.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/reboot.h>
#include <linux/regmap.h>

static const struct mfd_cell rn5t618_cells[] = {
	{ .name = "rn5t618-regulator" },
	{ .name = "rn5t618-wdt" },
};

static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case RN5T618_WATCHDOGCNT:
	case RN5T618_DCIRQ:
	case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
	case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
	case RN5T618_IR_GPR:
	case RN5T618_IR_GPF:
	case RN5T618_MON_IOIN:
	case RN5T618_INTMON:
		return true;
	default:
		return false;
	}
}

static const struct regmap_config rn5t618_regmap_config = {
	.reg_bits	= 8,
	.val_bits	= 8,
	.volatile_reg	= rn5t618_volatile_reg,
	.max_register	= RN5T618_MAX_REG,
	.cache_type	= REGCACHE_RBTREE,
};

static struct rn5t618 *rn5t618_pm_power_off;
static struct notifier_block rn5t618_restart_handler;

static void rn5t618_trigger_poweroff_sequence(bool repower)
{
	/* disable automatic repower-on */
	regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT,
			   RN5T618_REPCNT_REPWRON,
			   repower ? RN5T618_REPCNT_REPWRON : 0);
	/* start power-off sequence */
	regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT,
			   RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF);
}

static void rn5t618_power_off(void)
{
	rn5t618_trigger_poweroff_sequence(false);
}

static int rn5t618_restart(struct notifier_block *this,
			    unsigned long mode, void *cmd)
{
	rn5t618_trigger_poweroff_sequence(true);

	/*
	 * Re-power factor detection on PMIC side is not instant. 1ms
	 * proved to be enough time until reset takes effect.
	 */
	mdelay(1);

	return NOTIFY_DONE;
}

static const struct of_device_id rn5t618_of_match[] = {
	{ .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
	{ .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
	{ .compatible = "ricoh,rc5t619", .data = (void *)RC5T619 },
	{ }
};
MODULE_DEVICE_TABLE(of, rn5t618_of_match);

static int rn5t618_i2c_probe(struct i2c_client *i2c,
			     const struct i2c_device_id *id)
{
	const struct of_device_id *of_id;
	struct rn5t618 *priv;
	int ret;

	of_id = of_match_device(rn5t618_of_match, &i2c->dev);
	if (!of_id) {
		dev_err(&i2c->dev, "Failed to find matching DT ID\n");
		return -EINVAL;
	}

	priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	i2c_set_clientdata(i2c, priv);
	priv->variant = (long)of_id->data;

	priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
	if (IS_ERR(priv->regmap)) {
		ret = PTR_ERR(priv->regmap);
		dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
		return ret;
	}

	ret = devm_mfd_add_devices(&i2c->dev, -1, rn5t618_cells,
				   ARRAY_SIZE(rn5t618_cells), NULL, 0, NULL);
	if (ret) {
		dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
		return ret;
	}

	rn5t618_pm_power_off = priv;
	if (of_device_is_system_power_controller(i2c->dev.of_node)) {
		if (!pm_power_off)
			pm_power_off = rn5t618_power_off;
		else
			dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
	}

	rn5t618_restart_handler.notifier_call = rn5t618_restart;
	rn5t618_restart_handler.priority = 192;

	ret = register_restart_handler(&rn5t618_restart_handler);
	if (ret) {
		dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);
		return ret;
	}

	return 0;
}

static int rn5t618_i2c_remove(struct i2c_client *i2c)
{
	struct rn5t618 *priv = i2c_get_clientdata(i2c);

	if (priv == rn5t618_pm_power_off) {
		rn5t618_pm_power_off = NULL;
		pm_power_off = NULL;
	}

	return 0;
}

static const struct i2c_device_id rn5t618_i2c_id[] = {
	{ }
};
MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id);

static struct i2c_driver rn5t618_i2c_driver = {
	.driver = {
		.name = "rn5t618",
		.of_match_table = of_match_ptr(rn5t618_of_match),
	},
	.probe = rn5t618_i2c_probe,
	.remove = rn5t618_i2c_remove,
	.id_table = rn5t618_i2c_id,
};

module_i2c_driver(rn5t618_i2c_driver);

MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
9bb9e29c BG	1	/*
	2	* MFD core driver for Ricoh RN5T618 PMIC
	3	*
	4	* Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
a99ab50d	5	* Copyright (C) 2016 Toradex AG
9bb9e29c BG	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* version 2 as published by the Free Software Foundation.
	10	*
	11	* You should have received a copy of the GNU General Public License
	12	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	13	*/
	14
a370f60a	15	#include <linux/delay.h>
9bb9e29c BG	16	#include <linux/i2c.h>
	17	#include <linux/mfd/core.h>
	18	#include <linux/mfd/rn5t618.h>
	19	#include <linux/module.h>
a99ab50d	20	#include <linux/of_device.h>
a370f60a	21	#include <linux/reboot.h>
9bb9e29c BG	22	#include <linux/regmap.h>
	23
	24	static const struct mfd_cell rn5t618_cells[] = {
	25	{ .name = "rn5t618-regulator" },
	26	{ .name = "rn5t618-wdt" },
	27	};
	28
	29	static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
	30	{
	31	switch (reg) {
	32	case RN5T618_WATCHDOGCNT:
	33	case RN5T618_DCIRQ:
	34	case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
	35	case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
	36	case RN5T618_IR_GPR:
	37	case RN5T618_IR_GPF:
	38	case RN5T618_MON_IOIN:
	39	case RN5T618_INTMON:
	40	return true;
	41	default:
	42	return false;
	43	}
	44	}
	45
	46	static const struct regmap_config rn5t618_regmap_config = {
	47	.reg_bits = 8,
	48	.val_bits = 8,
	49	.volatile_reg = rn5t618_volatile_reg,
	50	.max_register = RN5T618_MAX_REG,
	51	.cache_type = REGCACHE_RBTREE,
	52	};
	53
	54	static struct rn5t618 *rn5t618_pm_power_off;
a370f60a	55	static struct notifier_block rn5t618_restart_handler;
9bb9e29c	56
a370f60a	57	static void rn5t618_trigger_poweroff_sequence(bool repower)
9bb9e29c BG	58	{
	59	/* disable automatic repower-on */
	60	regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT,
a370f60a SA	61	RN5T618_REPCNT_REPWRON,
a370f60a SA	62	repower ? RN5T618_REPCNT_REPWRON : 0);
9bb9e29c BG	63	/* start power-off sequence */
	64	regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT,
	65	RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF);
	66	}
	67
a370f60a SA	68	static void rn5t618_power_off(void)
	69	{
	70	rn5t618_trigger_poweroff_sequence(false);
	71	}
	72
	73	static int rn5t618_restart(struct notifier_block *this,
	74	unsigned long mode, void *cmd)
	75	{
	76	rn5t618_trigger_poweroff_sequence(true);
	77
	78	/*
	79	* Re-power factor detection on PMIC side is not instant. 1ms
	80	* proved to be enough time until reset takes effect.
	81	*/
	82	mdelay(1);
	83
	84	return NOTIFY_DONE;
	85	}
	86
a99ab50d SA	87	static const struct of_device_id rn5t618_of_match[] = {
	88	{ .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
	89	{ .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
c5e589a1	90	{ .compatible = "ricoh,rc5t619", .data = (void *)RC5T619 },
a99ab50d SA	91	{ }
	92	};
	93	MODULE_DEVICE_TABLE(of, rn5t618_of_match);
	94
9bb9e29c BG	95	static int rn5t618_i2c_probe(struct i2c_client *i2c,
	96	const struct i2c_device_id *id)
	97	{
a99ab50d	98	const struct of_device_id *of_id;
9bb9e29c BG	99	struct rn5t618 *priv;
	100	int ret;
	101
a99ab50d SA	102	of_id = of_match_device(rn5t618_of_match, &i2c->dev);
	103	if (!of_id) {
	104	dev_err(&i2c->dev, "Failed to find matching DT ID\n");
	105	return -EINVAL;
	106	}
	107
9bb9e29c BG	108	priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
	109	if (!priv)
	110	return -ENOMEM;
	111
	112	i2c_set_clientdata(i2c, priv);
a99ab50d	113	priv->variant = (long)of_id->data;
9bb9e29c BG	114
	115	priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
	116	if (IS_ERR(priv->regmap)) {
	117	ret = PTR_ERR(priv->regmap);
	118	dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
	119	return ret;
	120	}
	121
f41206c9 LD	122	ret = devm_mfd_add_devices(&i2c->dev, -1, rn5t618_cells,
f41206c9 LD	123	ARRAY_SIZE(rn5t618_cells), NULL, 0, NULL);
9bb9e29c BG	124	if (ret) {
	125	dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
	126	return ret;
	127	}
	128
a370f60a	129	rn5t618_pm_power_off = priv;
fd65ae4c	130	if (of_device_is_system_power_controller(i2c->dev.of_node)) {
a370f60a	131	if (!pm_power_off)
fd65ae4c	132	pm_power_off = rn5t618_power_off;
a370f60a	133	else
fd65ae4c	134	dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
a370f60a SA	135	}
	136
	137	rn5t618_restart_handler.notifier_call = rn5t618_restart;
	138	rn5t618_restart_handler.priority = 192;
	139
	140	ret = register_restart_handler(&rn5t618_restart_handler);
	141	if (ret) {
	142	dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);
	143	return ret;
9bb9e29c BG	144	}
	145
	146	return 0;
	147	}
	148
	149	static int rn5t618_i2c_remove(struct i2c_client *i2c)
	150	{
	151	struct rn5t618 *priv = i2c_get_clientdata(i2c);
	152
	153	if (priv == rn5t618_pm_power_off) {
	154	rn5t618_pm_power_off = NULL;
	155	pm_power_off = NULL;
	156	}
	157
9bb9e29c BG	158	return 0;
	159	}
	160
9bb9e29c BG	161	static const struct i2c_device_id rn5t618_i2c_id[] = {
	162	{ }
	163	};
	164	MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id);
	165
	166	static struct i2c_driver rn5t618_i2c_driver = {
	167	.driver = {
	168	.name = "rn5t618",
	169	.of_match_table = of_match_ptr(rn5t618_of_match),
	170	},
	171	.probe = rn5t618_i2c_probe,
	172	.remove = rn5t618_i2c_remove,
	173	.id_table = rn5t618_i2c_id,
	174	};
	175
	176	module_i2c_driver(rn5t618_i2c_driver);
	177
	178	MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
a99ab50d	179	MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver");
9bb9e29c	180	MODULE_LICENSE("GPL v2");