[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",
		.of_compatible = "ti,tps65217-pmic",
	},
	{
		.name = "tps65217-bl",
		.of_compatible = "ti,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 const 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 */ },
};
MODULE_DEVICE_TABLE(of, tps65217_of_match);

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",
		.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	{
817bb7fb AC	35	.name = "tps65217-pmic",
11d0d300	36	.of_compatible = "ti,tps65217-pmic",
817bb7fb	37	},
b6290ffe MK	38	{
b6290ffe MK	39	.name = "tps65217-bl",
11d0d300	40	.of_compatible = "ti,tps65217-bl",
b6290ffe	41	},
817bb7fb AC	42	};
817bb7fb AC	43
d48f411c AC	44	/**
	45	* tps65217_reg_read: Read a single tps65217 register.
	46	*
	47	* @tps: Device to read from.
	48	* @reg: Register to read.
	49	* @val: Contians the value
	50	*/
	51	int tps65217_reg_read(struct tps65217 *tps, unsigned int reg,
	52	unsigned int *val)
	53	{
	54	return regmap_read(tps->regmap, reg, val);
	55	}
	56	EXPORT_SYMBOL_GPL(tps65217_reg_read);
	57
	58	/**
	59	* tps65217_reg_write: Write a single tps65217 register.
	60	*
	61	* @tps65217: Device to write to.
	62	* @reg: Register to write to.
	63	* @val: Value to write.
	64	* @level: Password protected level
	65	*/
	66	int tps65217_reg_write(struct tps65217 *tps, unsigned int reg,
	67	unsigned int val, unsigned int level)
	68	{
	69	int ret;
	70	unsigned int xor_reg_val;
	71
	72	switch (level) {
	73	case TPS65217_PROTECT_NONE:
	74	return regmap_write(tps->regmap, reg, val);
	75	case TPS65217_PROTECT_L1:
	76	xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
	77	ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
	78	xor_reg_val);
	79	if (ret < 0)
	80	return ret;
	81
	82	return regmap_write(tps->regmap, reg, val);
	83	case TPS65217_PROTECT_L2:
	84	xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
	85	ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
	86	xor_reg_val);
	87	if (ret < 0)
	88	return ret;
	89	ret = regmap_write(tps->regmap, reg, val);
	90	if (ret < 0)
	91	return ret;
	92	ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
	93	xor_reg_val);
	94	if (ret < 0)
	95	return ret;
	96	return regmap_write(tps->regmap, reg, val);
	97	default:
	98	return -EINVAL;
	99	}
	100	}
	101	EXPORT_SYMBOL_GPL(tps65217_reg_write);
	102
	103	/**
	104	* tps65217_update_bits: Modify bits w.r.t mask, val and level.
	105	*
	106	* @tps65217: Device to write to.
	107	* @reg: Register to read-write to.
108	* @mask: Mask.
109	* @val: Value to write.
110	* @level: Password protected level
111	*/
27757e82	112	static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg,
d48f411c AC	113	unsigned int mask, unsigned int val, unsigned int level)
	114	{
	115	int ret;
	116	unsigned int data;
	117
	118	ret = tps65217_reg_read(tps, reg, &data);
	119	if (ret) {
	120	dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
	121	return ret;
	122	}
	123
	124	data &= ~mask;
	125	data \|= val & mask;
	126
	127	ret = tps65217_reg_write(tps, reg, data, level);
	128	if (ret)
	129	dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
	130
	131	return ret;
	132	}
	133
	134	int tps65217_set_bits(struct tps65217 *tps, unsigned int reg,
	135	unsigned int mask, unsigned int val, unsigned int level)
	136	{
	137	return tps65217_update_bits(tps, reg, mask, val, level);
	138	}
	139	EXPORT_SYMBOL_GPL(tps65217_set_bits);
	140
	141	int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg,
	142	unsigned int mask, unsigned int level)
	143	{
	144	return tps65217_update_bits(tps, reg, mask, 0, level);
	145	}
	146	EXPORT_SYMBOL_GPL(tps65217_clear_bits);
	147
af0a837d	148	static const struct regmap_config tps65217_regmap_config = {
d48f411c AC	149	.reg_bits = 8,
d48f411c AC	150	.val_bits = 8,
0b496b4c MB	151
0b496b4c MB	152	.max_register = TPS65217_REG_MAX,
d48f411c AC	153	};
d48f411c AC	154
817bb7fb AC	155	static const struct of_device_id tps65217_of_match[] = {
	156	{ .compatible = "ti,tps65217", .data = (void *)TPS65217 },
	157	{ /* sentinel */ },
	158	};
4895e493	159	MODULE_DEVICE_TABLE(of, tps65217_of_match);
817bb7fb	160
f791be49	161	static int tps65217_probe(struct i2c_client *client,
d48f411c AC	162	const struct i2c_device_id *ids)
	163	{
	164	struct tps65217 *tps;
d48f411c	165	unsigned int version;
5c6fbd56	166	unsigned long chip_id = ids->driver_data;
817bb7fb	167	const struct of_device_id *match;
eb433dad	168	bool status_off = false;
817bb7fb	169	int ret;
d48f411c	170
817bb7fb AC	171	if (client->dev.of_node) {
	172	match = of_match_device(tps65217_of_match, &client->dev);
	173	if (!match) {
	174	dev_err(&client->dev,
	175	"Failed to find matching dt id\n");
	176	return -EINVAL;
	177	}
5c6fbd56	178	chip_id = (unsigned long)match->data;
eb433dad CFP	179	status_off = of_property_read_bool(client->dev.of_node,
eb433dad CFP	180	"ti,pmic-shutdown-controller");
817bb7fb AC	181	}
	182
	183	if (!chip_id) {
	184	dev_err(&client->dev, "id is null.\n");
	185	return -ENODEV;
	186	}
a7f1b63e	187
d48f411c AC	188	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
	189	if (!tps)
	190	return -ENOMEM;
	191
817bb7fb AC	192	i2c_set_clientdata(client, tps);
	193	tps->dev = &client->dev;
	194	tps->id = chip_id;
	195
0ef4619c	196	tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config);
d48f411c AC	197	if (IS_ERR(tps->regmap)) {
	198	ret = PTR_ERR(tps->regmap);
	199	dev_err(tps->dev, "Failed to allocate register map: %d\n",
	200	ret);
	201	return ret;
	202	}
	203
817bb7fb	204	ret = mfd_add_devices(tps->dev, -1, tps65217s,
55692af5	205	ARRAY_SIZE(tps65217s), NULL, 0, NULL);
817bb7fb AC	206	if (ret < 0) {
	207	dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret);
	208	return ret;
	209	}
d48f411c AC	210
	211	ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
	212	if (ret < 0) {
0ef4619c AL	213	dev_err(tps->dev, "Failed to read revision register: %d\n",
	214	ret);
	215	return ret;
d48f411c AC	216	}
d48f411c AC	217
eb433dad CFP	218	/* Set the PMIC to shutdown on PWR_EN toggle */
	219	if (status_off) {
	220	ret = tps65217_set_bits(tps, TPS65217_REG_STATUS,
	221	TPS65217_STATUS_OFF, TPS65217_STATUS_OFF,
	222	TPS65217_PROTECT_NONE);
	223	if (ret)
	224	dev_warn(tps->dev, "unable to set the status OFF\n");
	225	}
	226
d48f411c AC	227	dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n",
	228	(version & TPS65217_CHIPID_CHIP_MASK) >> 4,
	229	version & TPS65217_CHIPID_REV_MASK);
	230
d48f411c	231	return 0;
d48f411c AC	232	}
d48f411c AC	233
4740f73f	234	static int tps65217_remove(struct i2c_client *client)
d48f411c AC	235	{
d48f411c AC	236	struct tps65217 *tps = i2c_get_clientdata(client);
d48f411c	237
817bb7fb	238	mfd_remove_devices(tps->dev);
d48f411c	239
d48f411c AC	240	return 0;
	241	}
	242
	243	static const struct i2c_device_id tps65217_id_table[] = {
817bb7fb AC	244	{"tps65217", TPS65217},
817bb7fb AC	245	{ /* sentinel */ }
d48f411c AC	246	};
	247	MODULE_DEVICE_TABLE(i2c, tps65217_id_table);
	248
	249	static struct i2c_driver tps65217_driver = {
	250	.driver = {
	251	.name = "tps65217",
a351451a	252	.of_match_table = tps65217_of_match,
d48f411c AC	253	},
	254	.id_table = tps65217_id_table,
	255	.probe = tps65217_probe,
84449216	256	.remove = tps65217_remove,
d48f411c AC	257	};
	258
	259	static int __init tps65217_init(void)
	260	{
	261	return i2c_add_driver(&tps65217_driver);
	262	}
	263	subsys_initcall(tps65217_init);
	264
	265	static void __exit tps65217_exit(void)
	266	{
	267	i2c_del_driver(&tps65217_driver);
	268	}
	269	module_exit(tps65217_exit);
	270
	271	MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
	272	MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
	273	MODULE_LICENSE("GPL v2");