[deliverable/linux.git] / drivers / mfd / tps6105x.c

/*
 * Core driver for TPS61050/61052 boost converters, used for while LED
 * driving, audio power amplification, white LED flash, and generic
 * boost conversion. Additionally it provides a 1-bit GPIO pin (out or in)
 * and a flash synchronization pin to synchronize flash events when used as
 * flashgun.
 *
 * Copyright (C) 2011 ST-Ericsson SA
 * Written on behalf of Linaro for ST-Ericsson
 *
 * Author: Linus Walleij <linus.walleij@linaro.org>
 *
 * License terms: GNU General Public License (GPL) version 2
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include <linux/gpio.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/regulator/driver.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tps6105x.h>

static struct regmap_config tps6105x_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = TPS6105X_REG_3,
};

static int tps6105x_startup(struct tps6105x *tps6105x)
{
	int ret;
	unsigned int regval;

	ret = regmap_read(tps6105x->regmap, TPS6105X_REG_0, &regval);
	if (ret)
		return ret;
	switch (regval >> TPS6105X_REG0_MODE_SHIFT) {
	case TPS6105X_REG0_MODE_SHUTDOWN:
		dev_info(&tps6105x->client->dev,
			 "TPS6105x found in SHUTDOWN mode\n");
		break;
	case TPS6105X_REG0_MODE_TORCH:
		dev_info(&tps6105x->client->dev,
			 "TPS6105x found in TORCH mode\n");
		break;
	case TPS6105X_REG0_MODE_TORCH_FLASH:
		dev_info(&tps6105x->client->dev,
			 "TPS6105x found in FLASH mode\n");
		break;
	case TPS6105X_REG0_MODE_VOLTAGE:
		dev_info(&tps6105x->client->dev,
			 "TPS6105x found in VOLTAGE mode\n");
		break;
	default:
		break;
	}

	return ret;
}

/*
 * MFD cells - we always have a GPIO cell and we have one cell
 * which is selected operation mode.
 */
static struct mfd_cell tps6105x_gpio_cell = {
	.name = "tps6105x-gpio",
};

static struct mfd_cell tps6105x_leds_cell = {
	.name = "tps6105x-leds",
};

static struct mfd_cell tps6105x_flash_cell = {
	.name = "tps6105x-flash",
};

static struct mfd_cell tps6105x_regulator_cell = {
	.name = "tps6105x-regulator",
};

static int tps6105x_add_device(struct tps6105x *tps6105x,
			       struct mfd_cell *cell)
{
	cell->platform_data = tps6105x;
	cell->pdata_size = sizeof(*tps6105x);

	return mfd_add_devices(&tps6105x->client->dev,
			       PLATFORM_DEVID_AUTO, cell, 1, NULL, 0, NULL);
}

static int tps6105x_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct tps6105x			*tps6105x;
	struct tps6105x_platform_data	*pdata;
	int ret;

	pdata = dev_get_platdata(&client->dev);
	if (!pdata) {
		dev_err(&client->dev, "missing platform data\n");
		return -ENODEV;
	}

	tps6105x = devm_kmalloc(&client->dev, sizeof(*tps6105x), GFP_KERNEL);
	if (!tps6105x)
		return -ENOMEM;

	tps6105x->regmap = devm_regmap_init_i2c(client, &tps6105x_regmap_config);
	if (IS_ERR(tps6105x->regmap))
		return PTR_ERR(tps6105x->regmap);

	i2c_set_clientdata(client, tps6105x);
	tps6105x->client = client;
	tps6105x->pdata = pdata;

	ret = tps6105x_startup(tps6105x);
	if (ret) {
		dev_err(&client->dev, "chip initialization failed\n");
		return ret;
	}

	ret = tps6105x_add_device(tps6105x, &tps6105x_gpio_cell);
	if (ret)
		return ret;

	switch (pdata->mode) {
	case TPS6105X_MODE_SHUTDOWN:
		dev_info(&client->dev,
			 "present, not used for anything, only GPIO\n");
		break;
	case TPS6105X_MODE_TORCH:
		ret = tps6105x_add_device(tps6105x, &tps6105x_leds_cell);
		break;
	case TPS6105X_MODE_TORCH_FLASH:
		ret = tps6105x_add_device(tps6105x, &tps6105x_flash_cell);
		break;
	case TPS6105X_MODE_VOLTAGE:
		ret = tps6105x_add_device(tps6105x, &tps6105x_regulator_cell);
		break;
	default:
		dev_warn(&client->dev, "invalid mode: %d\n", pdata->mode);
		break;
	}

	if (ret)
		mfd_remove_devices(&client->dev);

	return ret;
}

static int tps6105x_remove(struct i2c_client *client)
{
	struct tps6105x *tps6105x = i2c_get_clientdata(client);

	mfd_remove_devices(&client->dev);

	/* Put chip in shutdown mode */
	regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0,
		TPS6105X_REG0_MODE_MASK,
		TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);

	return 0;
}

static const struct i2c_device_id tps6105x_id[] = {
	{ "tps61050", 0 },
	{ "tps61052", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, tps6105x_id);

static struct i2c_driver tps6105x_driver = {
	.driver = {
		.name	= "tps6105x",
	},
	.probe		= tps6105x_probe,
	.remove		= tps6105x_remove,
	.id_table	= tps6105x_id,
};

static int __init tps6105x_init(void)
{
	return i2c_add_driver(&tps6105x_driver);
}
subsys_initcall(tps6105x_init);

static void __exit tps6105x_exit(void)
{
	i2c_del_driver(&tps6105x_driver);
}
module_exit(tps6105x_exit);

MODULE_AUTHOR("Linus Walleij");
MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
798a8eee LW	1	/*
	2	* Core driver for TPS61050/61052 boost converters, used for while LED
	3	* driving, audio power amplification, white LED flash, and generic
	4	* boost conversion. Additionally it provides a 1-bit GPIO pin (out or in)
	5	* and a flash synchronization pin to synchronize flash events when used as
	6	* flashgun.
	7	*
	8	* Copyright (C) 2011 ST-Ericsson SA
	9	* Written on behalf of Linaro for ST-Ericsson
	10	*
	11	* Author: Linus Walleij <linus.walleij@linaro.org>
	12	*
	13	* License terms: GNU General Public License (GPL) version 2
	14	*/
	15
	16	#include <linux/module.h>
	17	#include <linux/init.h>
	18	#include <linux/i2c.h>
7e507119	19	#include <linux/regmap.h>
798a8eee LW	20	#include <linux/gpio.h>
	21	#include <linux/spinlock.h>
	22	#include <linux/slab.h>
	23	#include <linux/err.h>
	24	#include <linux/regulator/driver.h>
	25	#include <linux/mfd/core.h>
	26	#include <linux/mfd/tps6105x.h>
	27
7e507119 GD	28	static struct regmap_config tps6105x_regmap_config = {
	29	.reg_bits = 8,
	30	.val_bits = 8,
	31	.max_register = TPS6105X_REG_3,
	32	};
798a8eee	33
f791be49	34	static int tps6105x_startup(struct tps6105x *tps6105x)
798a8eee LW	35	{
798a8eee LW	36	int ret;
7e507119	37	unsigned int regval;
798a8eee	38
7e507119	39	ret = regmap_read(tps6105x->regmap, TPS6105X_REG_0, &regval);
798a8eee LW	40	if (ret)
	41	return ret;
	42	switch (regval >> TPS6105X_REG0_MODE_SHIFT) {
	43	case TPS6105X_REG0_MODE_SHUTDOWN:
	44	dev_info(&tps6105x->client->dev,
	45	"TPS6105x found in SHUTDOWN mode\n");
	46	break;
	47	case TPS6105X_REG0_MODE_TORCH:
	48	dev_info(&tps6105x->client->dev,
	49	"TPS6105x found in TORCH mode\n");
	50	break;
	51	case TPS6105X_REG0_MODE_TORCH_FLASH:
	52	dev_info(&tps6105x->client->dev,
	53	"TPS6105x found in FLASH mode\n");
	54	break;
	55	case TPS6105X_REG0_MODE_VOLTAGE:
	56	dev_info(&tps6105x->client->dev,
	57	"TPS6105x found in VOLTAGE mode\n");
	58	break;
	59	default:
	60	break;
	61	}
	62
	63	return ret;
	64	}
	65
	66	/*
ea50e9d3 GD	67	* MFD cells - we always have a GPIO cell and we have one cell
ea50e9d3 GD	68	* which is selected operation mode.
798a8eee	69	*/
ea50e9d3 GD	70	static struct mfd_cell tps6105x_gpio_cell = {
	71	.name = "tps6105x-gpio",
	72	};
	73
	74	static struct mfd_cell tps6105x_leds_cell = {
	75	.name = "tps6105x-leds",
	76	};
	77
	78	static struct mfd_cell tps6105x_flash_cell = {
	79	.name = "tps6105x-flash",
798a8eee LW	80	};
798a8eee LW	81
ea50e9d3 GD	82	static struct mfd_cell tps6105x_regulator_cell = {
	83	.name = "tps6105x-regulator",
	84	};
	85
	86	static int tps6105x_add_device(struct tps6105x *tps6105x,
	87	struct mfd_cell *cell)
	88	{
	89	cell->platform_data = tps6105x;
	90	cell->pdata_size = sizeof(*tps6105x);
	91
	92	return mfd_add_devices(&tps6105x->client->dev,
	93	PLATFORM_DEVID_AUTO, cell, 1, NULL, 0, NULL);
	94	}
	95
f791be49	96	static int tps6105x_probe(struct i2c_client *client,
798a8eee LW	97	const struct i2c_device_id *id)
	98	{
	99	struct tps6105x *tps6105x;
	100	struct tps6105x_platform_data *pdata;
	101	int ret;
ea50e9d3 GD	102
	103	pdata = dev_get_platdata(&client->dev);
	104	if (!pdata) {
	105	dev_err(&client->dev, "missing platform data\n");
	106	return -ENODEV;
	107	}
798a8eee	108
ad83533a	109	tps6105x = devm_kmalloc(&client->dev, sizeof(*tps6105x), GFP_KERNEL);
798a8eee LW	110	if (!tps6105x)
	111	return -ENOMEM;
	112
7e507119 GD	113	tps6105x->regmap = devm_regmap_init_i2c(client, &tps6105x_regmap_config);
	114	if (IS_ERR(tps6105x->regmap))
	115	return PTR_ERR(tps6105x->regmap);
	116
798a8eee LW	117	i2c_set_clientdata(client, tps6105x);
798a8eee LW	118	tps6105x->client = client;
798a8eee	119	tps6105x->pdata = pdata;
798a8eee LW	120
	121	ret = tps6105x_startup(tps6105x);
	122	if (ret) {
	123	dev_err(&client->dev, "chip initialization failed\n");
ad83533a	124	return ret;
798a8eee LW	125	}
798a8eee LW	126
ea50e9d3 GD	127	ret = tps6105x_add_device(tps6105x, &tps6105x_gpio_cell);
	128	if (ret)
	129	return ret;
	130
798a8eee LW	131	switch (pdata->mode) {
	132	case TPS6105X_MODE_SHUTDOWN:
	133	dev_info(&client->dev,
	134	"present, not used for anything, only GPIO\n");
	135	break;
	136	case TPS6105X_MODE_TORCH:
ea50e9d3	137	ret = tps6105x_add_device(tps6105x, &tps6105x_leds_cell);
798a8eee LW	138	break;
798a8eee LW	139	case TPS6105X_MODE_TORCH_FLASH:
ea50e9d3	140	ret = tps6105x_add_device(tps6105x, &tps6105x_flash_cell);
798a8eee LW	141	break;
798a8eee LW	142	case TPS6105X_MODE_VOLTAGE:
ea50e9d3	143	ret = tps6105x_add_device(tps6105x, &tps6105x_regulator_cell);
798a8eee LW	144	break;
798a8eee LW	145	default:
ea50e9d3	146	dev_warn(&client->dev, "invalid mode: %d\n", pdata->mode);
798a8eee LW	147	break;
	148	}
	149
ea50e9d3 GD	150	if (ret)
ea50e9d3 GD	151	mfd_remove_devices(&client->dev);
798a8eee	152
ea50e9d3	153	return ret;
798a8eee LW	154	}
798a8eee LW	155
4740f73f	156	static int tps6105x_remove(struct i2c_client *client)
798a8eee LW	157	{
	158	struct tps6105x *tps6105x = i2c_get_clientdata(client);
	159
	160	mfd_remove_devices(&client->dev);
	161
	162	/* Put chip in shutdown mode */
7e507119	163	regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0,
798a8eee LW	164	TPS6105X_REG0_MODE_MASK,
	165	TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);
	166
798a8eee LW	167	return 0;
	168	}
	169
	170	static const struct i2c_device_id tps6105x_id[] = {
	171	{ "tps61050", 0 },
	172	{ "tps61052", 0 },
	173	{ }
	174	};
	175	MODULE_DEVICE_TABLE(i2c, tps6105x_id);
	176
	177	static struct i2c_driver tps6105x_driver = {
	178	.driver = {
	179	.name = "tps6105x",
	180	},
	181	.probe = tps6105x_probe,
84449216	182	.remove = tps6105x_remove,
798a8eee LW	183	.id_table = tps6105x_id,
	184	};
	185
	186	static int __init tps6105x_init(void)
	187	{
	188	return i2c_add_driver(&tps6105x_driver);
	189	}
	190	subsys_initcall(tps6105x_init);
	191
	192	static void __exit tps6105x_exit(void)
	193	{
	194	i2c_del_driver(&tps6105x_driver);
	195	}
	196	module_exit(tps6105x_exit);
	197
	198	MODULE_AUTHOR("Linus Walleij");
	199	MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver");
	200	MODULE_LICENSE("GPL v2");