[GitHub/mt8127/android_kernel_alcatel_ttab.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",
	},
	{
		.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,
};

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 int 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 int)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 = of_match_ptr(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
817bb7fb AC	33	static struct mfd_cell tps65217s[] = {
	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,
	149	};
	150
817bb7fb AC	151	static const struct of_device_id tps65217_of_match[] = {
	152	{ .compatible = "ti,tps65217", .data = (void *)TPS65217 },
	153	{ /* sentinel */ },
	154	};
	155
f791be49	156	static int tps65217_probe(struct i2c_client *client,
d48f411c AC	157	const struct i2c_device_id *ids)
	158	{
	159	struct tps65217 *tps;
d48f411c	160	unsigned int version;
817bb7fb AC	161	unsigned int chip_id = ids->driver_data;
817bb7fb AC	162	const struct of_device_id *match;
eb433dad	163	bool status_off = false;
817bb7fb	164	int ret;
d48f411c	165
817bb7fb AC	166	if (client->dev.of_node) {
	167	match = of_match_device(tps65217_of_match, &client->dev);
	168	if (!match) {
	169	dev_err(&client->dev,
	170	"Failed to find matching dt id\n");
	171	return -EINVAL;
	172	}
	173	chip_id = (unsigned int)match->data;
eb433dad CFP	174	status_off = of_property_read_bool(client->dev.of_node,
eb433dad CFP	175	"ti,pmic-shutdown-controller");
817bb7fb AC	176	}
	177
	178	if (!chip_id) {
	179	dev_err(&client->dev, "id is null.\n");
	180	return -ENODEV;
	181	}
a7f1b63e	182
d48f411c AC	183	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
	184	if (!tps)
	185	return -ENOMEM;
	186
817bb7fb AC	187	i2c_set_clientdata(client, tps);
	188	tps->dev = &client->dev;
	189	tps->id = chip_id;
	190
0ef4619c	191	tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config);
d48f411c AC	192	if (IS_ERR(tps->regmap)) {
	193	ret = PTR_ERR(tps->regmap);
	194	dev_err(tps->dev, "Failed to allocate register map: %d\n",
	195	ret);
	196	return ret;
	197	}
	198
817bb7fb	199	ret = mfd_add_devices(tps->dev, -1, tps65217s,
55692af5	200	ARRAY_SIZE(tps65217s), NULL, 0, NULL);
817bb7fb AC	201	if (ret < 0) {
	202	dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret);
	203	return ret;
	204	}
d48f411c AC	205
	206	ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
	207	if (ret < 0) {
0ef4619c AL	208	dev_err(tps->dev, "Failed to read revision register: %d\n",
	209	ret);
	210	return ret;
d48f411c AC	211	}
d48f411c AC	212
eb433dad CFP	213	/* Set the PMIC to shutdown on PWR_EN toggle */
	214	if (status_off) {
	215	ret = tps65217_set_bits(tps, TPS65217_REG_STATUS,
	216	TPS65217_STATUS_OFF, TPS65217_STATUS_OFF,
	217	TPS65217_PROTECT_NONE);
	218	if (ret)
	219	dev_warn(tps->dev, "unable to set the status OFF\n");
	220	}
	221
d48f411c AC	222	dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n",
	223	(version & TPS65217_CHIPID_CHIP_MASK) >> 4,
	224	version & TPS65217_CHIPID_REV_MASK);
	225
d48f411c	226	return 0;
d48f411c AC	227	}
d48f411c AC	228
4740f73f	229	static int tps65217_remove(struct i2c_client *client)
d48f411c AC	230	{
d48f411c AC	231	struct tps65217 *tps = i2c_get_clientdata(client);
d48f411c	232
817bb7fb	233	mfd_remove_devices(tps->dev);
d48f411c	234
d48f411c AC	235	return 0;
	236	}
	237
	238	static const struct i2c_device_id tps65217_id_table[] = {
817bb7fb AC	239	{"tps65217", TPS65217},
817bb7fb AC	240	{ /* sentinel */ }
d48f411c AC	241	};
	242	MODULE_DEVICE_TABLE(i2c, tps65217_id_table);
	243
	244	static struct i2c_driver tps65217_driver = {
	245	.driver = {
	246	.name = "tps65217",
a7f1b63e AC	247	.owner = THIS_MODULE,
a7f1b63e AC	248	.of_match_table = of_match_ptr(tps65217_of_match),
d48f411c AC	249	},
	250	.id_table = tps65217_id_table,
	251	.probe = tps65217_probe,
84449216	252	.remove = tps65217_remove,
d48f411c AC	253	};
	254
	255	static int __init tps65217_init(void)
	256	{
	257	return i2c_add_driver(&tps65217_driver);
	258	}
	259	subsys_initcall(tps65217_init);
	260
	261	static void __exit tps65217_exit(void)
	262	{
	263	i2c_del_driver(&tps65217_driver);
	264	}
	265	module_exit(tps65217_exit);
	266
	267	MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
	268	MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
	269	MODULE_LICENSE("GPL v2");