[linux-2.6-block.git] / drivers / mfd / rn5t618.c

/*
 * MFD core driver for Ricoh RN5T618 PMIC
 *
 * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
 *
 * 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/i2c.h>
#include <linux/mfd/core.h>
#include <linux/mfd/rn5t618.h>
#include <linux/module.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 void rn5t618_power_off(void)
{
	/* disable automatic repower-on */
	regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT,
			   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 int rn5t618_i2c_probe(struct i2c_client *i2c,
			     const struct i2c_device_id *id)
{
	struct rn5t618 *priv;
	int ret;

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

	i2c_set_clientdata(i2c, priv);

	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 = 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;
	}

	if (!pm_power_off) {
		rn5t618_pm_power_off = priv;
		pm_power_off = rn5t618_power_off;
	}

	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;
	}

	mfd_remove_devices(&i2c->dev);
	return 0;
}

static const struct of_device_id rn5t618_of_match[] = {
	{ .compatible = "ricoh,rn5t618" },
	{ }
};
MODULE_DEVICE_TABLE(of, rn5t618_of_match);

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 RN5T618 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>
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* version 2 as published by the Free Software Foundation.
	9	*
	10	* You should have received a copy of the GNU General Public License
	11	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	12	*/
	13
	14	#include <linux/i2c.h>
	15	#include <linux/mfd/core.h>
	16	#include <linux/mfd/rn5t618.h>
	17	#include <linux/module.h>
	18	#include <linux/regmap.h>
	19
	20	static const struct mfd_cell rn5t618_cells[] = {
	21	{ .name = "rn5t618-regulator" },
	22	{ .name = "rn5t618-wdt" },
	23	};
	24
	25	static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
	26	{
	27	switch (reg) {
	28	case RN5T618_WATCHDOGCNT:
	29	case RN5T618_DCIRQ:
	30	case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
	31	case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
	32	case RN5T618_IR_GPR:
	33	case RN5T618_IR_GPF:
	34	case RN5T618_MON_IOIN:
	35	case RN5T618_INTMON:
	36	return true;
	37	default:
	38	return false;
	39	}
	40	}
	41
	42	static const struct regmap_config rn5t618_regmap_config = {
	43	.reg_bits = 8,
	44	.val_bits = 8,
	45	.volatile_reg = rn5t618_volatile_reg,
	46	.max_register = RN5T618_MAX_REG,
	47	.cache_type = REGCACHE_RBTREE,
	48	};
	49
	50	static struct rn5t618 *rn5t618_pm_power_off;
	51
	52	static void rn5t618_power_off(void)
	53	{
	54	/* disable automatic repower-on */
	55	regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT,
	56	RN5T618_REPCNT_REPWRON, 0);
	57	/* start power-off sequence */
	58	regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT,
	59	RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF);
	60	}
	61
	62	static int rn5t618_i2c_probe(struct i2c_client *i2c,
	63	const struct i2c_device_id *id)
	64	{
65	struct rn5t618 *priv;
66	int ret;
67
68	priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
69	if (!priv)
70	return -ENOMEM;
71
72	i2c_set_clientdata(i2c, priv);
73
74	priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
75	if (IS_ERR(priv->regmap)) {
76	ret = PTR_ERR(priv->regmap);
77	dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
78	return ret;
79	}
80
81	ret = mfd_add_devices(&i2c->dev, -1, rn5t618_cells,
82	ARRAY_SIZE(rn5t618_cells), NULL, 0, NULL);
83	if (ret) {
84	dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
85	return ret;
86	}
87
88	if (!pm_power_off) {
89	rn5t618_pm_power_off = priv;
90	pm_power_off = rn5t618_power_off;
91	}
92
93	return 0;
94	}
95
96	static int rn5t618_i2c_remove(struct i2c_client *i2c)
97	{
98	struct rn5t618 *priv = i2c_get_clientdata(i2c);
99
100	if (priv == rn5t618_pm_power_off) {
101	rn5t618_pm_power_off = NULL;
102	pm_power_off = NULL;
103	}
104
105	mfd_remove_devices(&i2c->dev);
106	return 0;
107	}
108
109	static const struct of_device_id rn5t618_of_match[] = {
110	{ .compatible = "ricoh,rn5t618" },
111	{ }
112	};
113	MODULE_DEVICE_TABLE(of, rn5t618_of_match);
114
115	static const struct i2c_device_id rn5t618_i2c_id[] = {
116	{ }
117	};
118	MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id);
119
120	static struct i2c_driver rn5t618_i2c_driver = {
121	.driver = {
122	.name = "rn5t618",
123	.of_match_table = of_match_ptr(rn5t618_of_match),
124	},
125	.probe = rn5t618_i2c_probe,
126	.remove = rn5t618_i2c_remove,
127	.id_table = rn5t618_i2c_id,
128	};
129
130	module_i2c_driver(rn5t618_i2c_driver);
131
132	MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
133	MODULE_DESCRIPTION("Ricoh RN5T618 MFD driver");
134	MODULE_LICENSE("GPL v2");