[linux-2.6-block.git] / drivers / mfd / tps65217.c

/*
 * tps65217.c
 *
 * TPS65217 chip family multi-function driver
 *
 * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation version 2.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/regmap.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/of_device.h>

#include <linux/mfd/core.h>
#include <linux/mfd/tps65217.h>

static struct mfd_cell tps65217s[] = {
	{
		.name = "tps65217-pmic",
	},
};

/**
 * tps65217_reg_read: Read a single tps65217 register.
 *
 * @tps: Device to read from.
 * @reg: Register to read.
 * @val: Contians the value
 */
int tps65217_reg_read(struct tps65217 *tps, unsigned int reg,
			unsigned int *val)
{
	return regmap_read(tps->regmap, reg, val);
}
EXPORT_SYMBOL_GPL(tps65217_reg_read);

/**
 * tps65217_reg_write: Write a single tps65217 register.
 *
 * @tps65217: Device to write to.
 * @reg: Register to write to.
 * @val: Value to write.
 * @level: Password protected level
 */
int tps65217_reg_write(struct tps65217 *tps, unsigned int reg,
			unsigned int val, unsigned int level)
{
	int ret;
	unsigned int xor_reg_val;

	switch (level) {
	case TPS65217_PROTECT_NONE:
		return regmap_write(tps->regmap, reg, val);
	case TPS65217_PROTECT_L1:
		xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
		ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
							xor_reg_val);
		if (ret < 0)
			return ret;

		return regmap_write(tps->regmap, reg, val);
	case TPS65217_PROTECT_L2:
		xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
		ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
							xor_reg_val);
		if (ret < 0)
			return ret;
		ret = regmap_write(tps->regmap, reg, val);
		if (ret < 0)
			return ret;
		ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
							xor_reg_val);
		if (ret < 0)
			return ret;
		return regmap_write(tps->regmap, reg, val);
	default:
		return -EINVAL;
	}
}
EXPORT_SYMBOL_GPL(tps65217_reg_write);

/**
 * tps65217_update_bits: Modify bits w.r.t mask, val and level.
 *
 * @tps65217: Device to write to.
 * @reg: Register to read-write to.
 * @mask: Mask.
 * @val: Value to write.
 * @level: Password protected level
 */
static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg,
		unsigned int mask, unsigned int val, unsigned int level)
{
	int ret;
	unsigned int data;

	ret = tps65217_reg_read(tps, reg, &data);
	if (ret) {
		dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
		return ret;
	}

	data &= ~mask;
	data |= val & mask;

	ret = tps65217_reg_write(tps, reg, data, level);
	if (ret)
		dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);

	return ret;
}

int tps65217_set_bits(struct tps65217 *tps, unsigned int reg,
		unsigned int mask, unsigned int val, unsigned int level)
{
	return tps65217_update_bits(tps, reg, mask, val, level);
}
EXPORT_SYMBOL_GPL(tps65217_set_bits);

int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg,
		unsigned int mask, unsigned int level)
{
	return tps65217_update_bits(tps, reg, mask, 0, level);
}
EXPORT_SYMBOL_GPL(tps65217_clear_bits);

static struct regmap_config tps65217_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
};

static const struct of_device_id tps65217_of_match[] = {
	{ .compatible = "ti,tps65217", .data = (void *)TPS65217 },
	{ /* sentinel */ },
};

static int __devinit tps65217_probe(struct i2c_client *client,
				const struct i2c_device_id *ids)
{
	struct tps65217 *tps;
	unsigned int version;
	unsigned int chip_id = ids->driver_data;
	const struct of_device_id *match;
	int ret;

	if (client->dev.of_node) {
		match = of_match_device(tps65217_of_match, &client->dev);
		if (!match) {
			dev_err(&client->dev,
				"Failed to find matching dt id\n");
			return -EINVAL;
		}
		chip_id = (unsigned int)match->data;
	}

	if (!chip_id) {
		dev_err(&client->dev, "id is null.\n");
		return -ENODEV;
	}

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

	i2c_set_clientdata(client, tps);
	tps->dev = &client->dev;
	tps->id = chip_id;

	tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config);
	if (IS_ERR(tps->regmap)) {
		ret = PTR_ERR(tps->regmap);
		dev_err(tps->dev, "Failed to allocate register map: %d\n",
			ret);
		return ret;
	}

	ret = mfd_add_devices(tps->dev, -1, tps65217s,
					ARRAY_SIZE(tps65217s), NULL, 0);
	if (ret < 0) {
		dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret);
		return ret;
	}

	ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
	if (ret < 0) {
		dev_err(tps->dev, "Failed to read revision register: %d\n",
			ret);
		return ret;
	}

	dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n",
			(version & TPS65217_CHIPID_CHIP_MASK) >> 4,
			version & TPS65217_CHIPID_REV_MASK);

	return 0;
}

static int __devexit tps65217_remove(struct i2c_client *client)
{
	struct tps65217 *tps = i2c_get_clientdata(client);

	mfd_remove_devices(tps->dev);

	return 0;
}

static const struct i2c_device_id tps65217_id_table[] = {
	{"tps65217", TPS65217},
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(i2c, tps65217_id_table);

static struct i2c_driver tps65217_driver = {
	.driver		= {
		.name	= "tps65217",
		.owner	= THIS_MODULE,
		.of_match_table = of_match_ptr(tps65217_of_match),
	},
	.id_table	= tps65217_id_table,
	.probe		= tps65217_probe,
	.remove		= __devexit_p(tps65217_remove),
};

static int __init tps65217_init(void)
{
	return i2c_add_driver(&tps65217_driver);
}
subsys_initcall(tps65217_init);

static void __exit tps65217_exit(void)
{
	i2c_del_driver(&tps65217_driver);
}
module_exit(tps65217_exit);

MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
d48f411c AC	1	/*
	2	* tps65217.c
	3	*
	4	* TPS65217 chip family multi-function driver
	5	*
	6	* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License as
	10	* published by the Free Software Foundation version 2.
	11	*
	12	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	13	* kind, whether express or implied; without even the implied warranty
	14	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*/
	17
	18	#include <linux/kernel.h>
	19	#include <linux/device.h>
	20	#include <linux/module.h>
	21	#include <linux/platform_device.h>
	22	#include <linux/init.h>
	23	#include <linux/i2c.h>
	24	#include <linux/slab.h>
	25	#include <linux/regmap.h>
	26	#include <linux/err.h>
817bb7fb AC	27	#include <linux/of.h>
817bb7fb AC	28	#include <linux/of_device.h>
d48f411c AC	29
	30	#include <linux/mfd/core.h>
	31	#include <linux/mfd/tps65217.h>
	32
817bb7fb AC	33	static struct mfd_cell tps65217s[] = {
	34	{
	35	.name = "tps65217-pmic",
	36	},
	37	};
	38
d48f411c AC	39	/**
	40	* tps65217_reg_read: Read a single tps65217 register.
	41	*
	42	* @tps: Device to read from.
	43	* @reg: Register to read.
	44	* @val: Contians the value
	45	*/
	46	int tps65217_reg_read(struct tps65217 *tps, unsigned int reg,
	47	unsigned int *val)
	48	{
	49	return regmap_read(tps->regmap, reg, val);
	50	}
	51	EXPORT_SYMBOL_GPL(tps65217_reg_read);
	52
	53	/**
	54	* tps65217_reg_write: Write a single tps65217 register.
	55	*
	56	* @tps65217: Device to write to.
	57	* @reg: Register to write to.
	58	* @val: Value to write.
	59	* @level: Password protected level
	60	*/
	61	int tps65217_reg_write(struct tps65217 *tps, unsigned int reg,
	62	unsigned int val, unsigned int level)
	63	{
	64	int ret;
	65	unsigned int xor_reg_val;
	66
	67	switch (level) {
	68	case TPS65217_PROTECT_NONE:
	69	return regmap_write(tps->regmap, reg, val);
	70	case TPS65217_PROTECT_L1:
	71	xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
	72	ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
	73	xor_reg_val);
	74	if (ret < 0)
	75	return ret;
	76
	77	return regmap_write(tps->regmap, reg, val);
	78	case TPS65217_PROTECT_L2:
	79	xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
	80	ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
	81	xor_reg_val);
	82	if (ret < 0)
	83	return ret;
	84	ret = regmap_write(tps->regmap, reg, val);
	85	if (ret < 0)
	86	return ret;
	87	ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
	88	xor_reg_val);
	89	if (ret < 0)
	90	return ret;
	91	return regmap_write(tps->regmap, reg, val);
	92	default:
	93	return -EINVAL;
	94	}
	95	}
	96	EXPORT_SYMBOL_GPL(tps65217_reg_write);
	97
	98	/**
	99	* tps65217_update_bits: Modify bits w.r.t mask, val and level.
	100	*
	101	* @tps65217: Device to write to.
	102	* @reg: Register to read-write to.
103	* @mask: Mask.
104	* @val: Value to write.
105	* @level: Password protected level
106	*/
27757e82	107	static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg,
d48f411c AC	108	unsigned int mask, unsigned int val, unsigned int level)
	109	{
	110	int ret;
	111	unsigned int data;
	112
	113	ret = tps65217_reg_read(tps, reg, &data);
	114	if (ret) {
	115	dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
	116	return ret;
	117	}
	118
	119	data &= ~mask;
	120	data \|= val & mask;
	121
	122	ret = tps65217_reg_write(tps, reg, data, level);
	123	if (ret)
	124	dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
	125
	126	return ret;
	127	}
	128
	129	int tps65217_set_bits(struct tps65217 *tps, unsigned int reg,
	130	unsigned int mask, unsigned int val, unsigned int level)
	131	{
	132	return tps65217_update_bits(tps, reg, mask, val, level);
	133	}
	134	EXPORT_SYMBOL_GPL(tps65217_set_bits);
	135
	136	int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg,
	137	unsigned int mask, unsigned int level)
	138	{
	139	return tps65217_update_bits(tps, reg, mask, 0, level);
	140	}
	141	EXPORT_SYMBOL_GPL(tps65217_clear_bits);
	142
	143	static struct regmap_config tps65217_regmap_config = {
	144	.reg_bits = 8,
	145	.val_bits = 8,
	146	};
	147
817bb7fb AC	148	static const struct of_device_id tps65217_of_match[] = {
	149	{ .compatible = "ti,tps65217", .data = (void *)TPS65217 },
	150	{ /* sentinel */ },
	151	};
	152
d48f411c AC	153	static int __devinit tps65217_probe(struct i2c_client *client,
	154	const struct i2c_device_id *ids)
	155	{
	156	struct tps65217 *tps;
d48f411c	157	unsigned int version;
817bb7fb AC	158	unsigned int chip_id = ids->driver_data;
	159	const struct of_device_id *match;
	160	int ret;
d48f411c	161
817bb7fb AC	162	if (client->dev.of_node) {
	163	match = of_match_device(tps65217_of_match, &client->dev);
	164	if (!match) {
	165	dev_err(&client->dev,
	166	"Failed to find matching dt id\n");
	167	return -EINVAL;
	168	}
	169	chip_id = (unsigned int)match->data;
	170	}
	171
	172	if (!chip_id) {
	173	dev_err(&client->dev, "id is null.\n");
	174	return -ENODEV;
	175	}
a7f1b63e	176
d48f411c AC	177	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
	178	if (!tps)
	179	return -ENOMEM;
	180
817bb7fb AC	181	i2c_set_clientdata(client, tps);
	182	tps->dev = &client->dev;
	183	tps->id = chip_id;
	184
0ef4619c	185	tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config);
d48f411c AC	186	if (IS_ERR(tps->regmap)) {
	187	ret = PTR_ERR(tps->regmap);
	188	dev_err(tps->dev, "Failed to allocate register map: %d\n",
	189	ret);
	190	return ret;
	191	}
	192
817bb7fb AC	193	ret = mfd_add_devices(tps->dev, -1, tps65217s,
	194	ARRAY_SIZE(tps65217s), NULL, 0);
	195	if (ret < 0) {
	196	dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret);
	197	return ret;
	198	}
d48f411c AC	199
	200	ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
	201	if (ret < 0) {
0ef4619c AL	202	dev_err(tps->dev, "Failed to read revision register: %d\n",
	203	ret);
	204	return ret;
d48f411c AC	205	}
	206
	207	dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n",
	208	(version & TPS65217_CHIPID_CHIP_MASK) >> 4,
	209	version & TPS65217_CHIPID_REV_MASK);
	210
d48f411c	211	return 0;
d48f411c AC	212	}
	213
	214	static int __devexit tps65217_remove(struct i2c_client *client)
	215	{
	216	struct tps65217 *tps = i2c_get_clientdata(client);
d48f411c	217
817bb7fb	218	mfd_remove_devices(tps->dev);
d48f411c	219
d48f411c AC	220	return 0;
	221	}
	222
	223	static const struct i2c_device_id tps65217_id_table[] = {
817bb7fb AC	224	{"tps65217", TPS65217},
817bb7fb AC	225	{ /* sentinel */ }
d48f411c AC	226	};
	227	MODULE_DEVICE_TABLE(i2c, tps65217_id_table);
	228
	229	static struct i2c_driver tps65217_driver = {
	230	.driver = {
	231	.name = "tps65217",
a7f1b63e AC	232	.owner = THIS_MODULE,
a7f1b63e AC	233	.of_match_table = of_match_ptr(tps65217_of_match),
d48f411c AC	234	},
	235	.id_table = tps65217_id_table,
	236	.probe = tps65217_probe,
	237	.remove = __devexit_p(tps65217_remove),
	238	};
	239
	240	static int __init tps65217_init(void)
	241	{
	242	return i2c_add_driver(&tps65217_driver);
	243	}
	244	subsys_initcall(tps65217_init);
	245
	246	static void __exit tps65217_exit(void)
	247	{
	248	i2c_del_driver(&tps65217_driver);
	249	}
	250	module_exit(tps65217_exit);
	251
	252	MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
	253	MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
	254	MODULE_LICENSE("GPL v2");