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