[deliverable/linux.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 const struct mfd_cell tps65217s[] = {
	{
		.name = "tps65217-pmic",
	},
	{
		.name = "tps65217-bl",
	},
};

/**
 * 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,

	.max_register = TPS65217_REG_MAX,
};

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

static int tps65217_probe(struct i2c_client *client,
				const struct i2c_device_id *ids)
{
	struct tps65217 *tps;
	unsigned int version;
	unsigned long chip_id = ids->driver_data;
	const struct of_device_id *match;
	bool status_off = false;
	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 long)match->data;
		status_off = of_property_read_bool(client->dev.of_node,
					"ti,pmic-shutdown-controller");
	}

	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, NULL);
	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;
	}

	/* Set the PMIC to shutdown on PWR_EN toggle */
	if (status_off) {
		ret = tps65217_set_bits(tps, TPS65217_REG_STATUS,
				TPS65217_STATUS_OFF, TPS65217_STATUS_OFF,
				TPS65217_PROTECT_NONE);
		if (ret)
			dev_warn(tps->dev, "unable to set the status OFF\n");
	}

	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 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 = tps65217_of_match,
	},
	.id_table	= tps65217_id_table,
	.probe		= tps65217_probe,
	.remove		= 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
30fe2b5b	33	static const struct mfd_cell tps65217s[] = {
817bb7fb AC	34	{
	35	.name = "tps65217-pmic",
	36	},
b6290ffe MK	37	{
	38	.name = "tps65217-bl",
	39	},
817bb7fb AC	40	};
817bb7fb AC	41
d48f411c AC	42	/**
	43	* tps65217_reg_read: Read a single tps65217 register.
	44	*
	45	* @tps: Device to read from.
	46	* @reg: Register to read.
	47	* @val: Contians the value
	48	*/
	49	int tps65217_reg_read(struct tps65217 *tps, unsigned int reg,
	50	unsigned int *val)
	51	{
	52	return regmap_read(tps->regmap, reg, val);
	53	}
	54	EXPORT_SYMBOL_GPL(tps65217_reg_read);
	55
	56	/**
	57	* tps65217_reg_write: Write a single tps65217 register.
	58	*
	59	* @tps65217: Device to write to.
	60	* @reg: Register to write to.
	61	* @val: Value to write.
	62	* @level: Password protected level
	63	*/
	64	int tps65217_reg_write(struct tps65217 *tps, unsigned int reg,
	65	unsigned int val, unsigned int level)
	66	{
	67	int ret;
	68	unsigned int xor_reg_val;
	69
	70	switch (level) {
	71	case TPS65217_PROTECT_NONE:
	72	return regmap_write(tps->regmap, reg, val);
	73	case TPS65217_PROTECT_L1:
	74	xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
	75	ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
	76	xor_reg_val);
	77	if (ret < 0)
	78	return ret;
	79
	80	return regmap_write(tps->regmap, reg, val);
	81	case TPS65217_PROTECT_L2:
	82	xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
	83	ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
	84	xor_reg_val);
	85	if (ret < 0)
	86	return ret;
	87	ret = regmap_write(tps->regmap, reg, val);
	88	if (ret < 0)
	89	return ret;
	90	ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
	91	xor_reg_val);
	92	if (ret < 0)
	93	return ret;
	94	return regmap_write(tps->regmap, reg, val);
	95	default:
	96	return -EINVAL;
	97	}
	98	}
	99	EXPORT_SYMBOL_GPL(tps65217_reg_write);
	100
	101	/**
	102	* tps65217_update_bits: Modify bits w.r.t mask, val and level.
	103	*
	104	* @tps65217: Device to write to.
	105	* @reg: Register to read-write to.
106	* @mask: Mask.
107	* @val: Value to write.
108	* @level: Password protected level
109	*/
27757e82	110	static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg,
d48f411c AC	111	unsigned int mask, unsigned int val, unsigned int level)
	112	{
	113	int ret;
	114	unsigned int data;
	115
	116	ret = tps65217_reg_read(tps, reg, &data);
	117	if (ret) {
	118	dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
	119	return ret;
	120	}
	121
	122	data &= ~mask;
	123	data \|= val & mask;
	124
	125	ret = tps65217_reg_write(tps, reg, data, level);
	126	if (ret)
	127	dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
	128
	129	return ret;
	130	}
	131
	132	int tps65217_set_bits(struct tps65217 *tps, unsigned int reg,
	133	unsigned int mask, unsigned int val, unsigned int level)
	134	{
	135	return tps65217_update_bits(tps, reg, mask, val, level);
	136	}
	137	EXPORT_SYMBOL_GPL(tps65217_set_bits);
	138
	139	int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg,
	140	unsigned int mask, unsigned int level)
	141	{
	142	return tps65217_update_bits(tps, reg, mask, 0, level);
	143	}
	144	EXPORT_SYMBOL_GPL(tps65217_clear_bits);
	145
	146	static struct regmap_config tps65217_regmap_config = {
	147	.reg_bits = 8,
	148	.val_bits = 8,
0b496b4c MB	149
0b496b4c MB	150	.max_register = TPS65217_REG_MAX,
d48f411c AC	151	};
d48f411c AC	152
817bb7fb AC	153	static const struct of_device_id tps65217_of_match[] = {
	154	{ .compatible = "ti,tps65217", .data = (void *)TPS65217 },
	155	{ /* sentinel */ },
	156	};
	157
f791be49	158	static int tps65217_probe(struct i2c_client *client,
d48f411c AC	159	const struct i2c_device_id *ids)
	160	{
	161	struct tps65217 *tps;
d48f411c	162	unsigned int version;
5c6fbd56	163	unsigned long chip_id = ids->driver_data;
817bb7fb	164	const struct of_device_id *match;
eb433dad	165	bool status_off = false;
817bb7fb	166	int ret;
d48f411c	167
817bb7fb AC	168	if (client->dev.of_node) {
	169	match = of_match_device(tps65217_of_match, &client->dev);
	170	if (!match) {
	171	dev_err(&client->dev,
	172	"Failed to find matching dt id\n");
	173	return -EINVAL;
	174	}
5c6fbd56	175	chip_id = (unsigned long)match->data;
eb433dad CFP	176	status_off = of_property_read_bool(client->dev.of_node,
eb433dad CFP	177	"ti,pmic-shutdown-controller");
817bb7fb AC	178	}
	179
	180	if (!chip_id) {
	181	dev_err(&client->dev, "id is null.\n");
	182	return -ENODEV;
	183	}
a7f1b63e	184
d48f411c AC	185	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
	186	if (!tps)
	187	return -ENOMEM;
	188
817bb7fb AC	189	i2c_set_clientdata(client, tps);
	190	tps->dev = &client->dev;
	191	tps->id = chip_id;
	192
0ef4619c	193	tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config);
d48f411c AC	194	if (IS_ERR(tps->regmap)) {
	195	ret = PTR_ERR(tps->regmap);
	196	dev_err(tps->dev, "Failed to allocate register map: %d\n",
	197	ret);
	198	return ret;
	199	}
	200
817bb7fb	201	ret = mfd_add_devices(tps->dev, -1, tps65217s,
55692af5	202	ARRAY_SIZE(tps65217s), NULL, 0, NULL);
817bb7fb AC	203	if (ret < 0) {
	204	dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret);
	205	return ret;
	206	}
d48f411c AC	207
	208	ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
	209	if (ret < 0) {
0ef4619c AL	210	dev_err(tps->dev, "Failed to read revision register: %d\n",
	211	ret);
	212	return ret;
d48f411c AC	213	}
d48f411c AC	214
eb433dad CFP	215	/* Set the PMIC to shutdown on PWR_EN toggle */
	216	if (status_off) {
	217	ret = tps65217_set_bits(tps, TPS65217_REG_STATUS,
	218	TPS65217_STATUS_OFF, TPS65217_STATUS_OFF,
	219	TPS65217_PROTECT_NONE);
	220	if (ret)
	221	dev_warn(tps->dev, "unable to set the status OFF\n");
	222	}
	223
d48f411c AC	224	dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n",
	225	(version & TPS65217_CHIPID_CHIP_MASK) >> 4,
	226	version & TPS65217_CHIPID_REV_MASK);
	227
d48f411c	228	return 0;
d48f411c AC	229	}
d48f411c AC	230
4740f73f	231	static int tps65217_remove(struct i2c_client *client)
d48f411c AC	232	{
d48f411c AC	233	struct tps65217 *tps = i2c_get_clientdata(client);
d48f411c	234
817bb7fb	235	mfd_remove_devices(tps->dev);
d48f411c	236
d48f411c AC	237	return 0;
	238	}
	239
	240	static const struct i2c_device_id tps65217_id_table[] = {
817bb7fb AC	241	{"tps65217", TPS65217},
817bb7fb AC	242	{ /* sentinel */ }
d48f411c AC	243	};
	244	MODULE_DEVICE_TABLE(i2c, tps65217_id_table);
	245
	246	static struct i2c_driver tps65217_driver = {
	247	.driver = {
	248	.name = "tps65217",
a7f1b63e	249	.owner = THIS_MODULE,
a351451a	250	.of_match_table = tps65217_of_match,
d48f411c AC	251	},
	252	.id_table = tps65217_id_table,
	253	.probe = tps65217_probe,
84449216	254	.remove = tps65217_remove,
d48f411c AC	255	};
	256
	257	static int __init tps65217_init(void)
	258	{
	259	return i2c_add_driver(&tps65217_driver);
	260	}
	261	subsys_initcall(tps65217_init);
	262
	263	static void __exit tps65217_exit(void)
	264	{
	265	i2c_del_driver(&tps65217_driver);
	266	}
	267	module_exit(tps65217_exit);
	268
	269	MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
	270	MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
	271	MODULE_LICENSE("GPL v2");