[mirror_ubuntu-artful-kernel.git] / drivers / mfd / as3711.c

/*
 * AS3711 PMIC MFC driver
 *
 * Copyright (C) 2012 Renesas Electronics Corporation
 * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the version 2 of the GNU General Public License as
 * published by the Free Software Foundation
 */

#include <linux/device.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mfd/as3711.h>
#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/slab.h>

enum {
	AS3711_REGULATOR,
	AS3711_BACKLIGHT,
};

/*
 * Ok to have it static: it is only used during probing and multiple I2C devices
 * cannot be probed simultaneously. Just make sure to avoid stale data.
 */
static struct mfd_cell as3711_subdevs[] = {
	[AS3711_REGULATOR] = {.name = "as3711-regulator",},
	[AS3711_BACKLIGHT] = {.name = "as3711-backlight",},
};

static bool as3711_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case AS3711_GPIO_SIGNAL_IN:
	case AS3711_INTERRUPT_STATUS_1:
	case AS3711_INTERRUPT_STATUS_2:
	case AS3711_INTERRUPT_STATUS_3:
	case AS3711_CHARGER_STATUS_1:
	case AS3711_CHARGER_STATUS_2:
	case AS3711_REG_STATUS:
		return true;
	}
	return false;
}

static bool as3711_precious_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case AS3711_INTERRUPT_STATUS_1:
	case AS3711_INTERRUPT_STATUS_2:
	case AS3711_INTERRUPT_STATUS_3:
		return true;
	}
	return false;
}

static bool as3711_readable_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case AS3711_SD_1_VOLTAGE:
	case AS3711_SD_2_VOLTAGE:
	case AS3711_SD_3_VOLTAGE:
	case AS3711_SD_4_VOLTAGE:
	case AS3711_LDO_1_VOLTAGE:
	case AS3711_LDO_2_VOLTAGE:
	case AS3711_LDO_3_VOLTAGE:
	case AS3711_LDO_4_VOLTAGE:
	case AS3711_LDO_5_VOLTAGE:
	case AS3711_LDO_6_VOLTAGE:
	case AS3711_LDO_7_VOLTAGE:
	case AS3711_LDO_8_VOLTAGE:
	case AS3711_SD_CONTROL:
	case AS3711_GPIO_SIGNAL_OUT:
	case AS3711_GPIO_SIGNAL_IN:
	case AS3711_SD_CONTROL_1:
	case AS3711_SD_CONTROL_2:
	case AS3711_CURR_CONTROL:
	case AS3711_CURR1_VALUE:
	case AS3711_CURR2_VALUE:
	case AS3711_CURR3_VALUE:
	case AS3711_STEPUP_CONTROL_1:
	case AS3711_STEPUP_CONTROL_2:
	case AS3711_STEPUP_CONTROL_4:
	case AS3711_STEPUP_CONTROL_5:
	case AS3711_REG_STATUS:
	case AS3711_INTERRUPT_STATUS_1:
	case AS3711_INTERRUPT_STATUS_2:
	case AS3711_INTERRUPT_STATUS_3:
	case AS3711_CHARGER_STATUS_1:
	case AS3711_CHARGER_STATUS_2:
	case AS3711_ASIC_ID_1:
	case AS3711_ASIC_ID_2:
		return true;
	}
	return false;
}

static const struct regmap_config as3711_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.volatile_reg = as3711_volatile_reg,
	.readable_reg = as3711_readable_reg,
	.precious_reg = as3711_precious_reg,
	.max_register = AS3711_MAX_REG,
	.num_reg_defaults_raw = AS3711_NUM_REGS,
	.cache_type = REGCACHE_RBTREE,
};

#ifdef CONFIG_OF
static const struct of_device_id as3711_of_match[] = {
	{.compatible = "ams,as3711",},
	{}
};
MODULE_DEVICE_TABLE(of, as3711_of_match);
#endif

static int as3711_i2c_probe(struct i2c_client *client,
			    const struct i2c_device_id *id)
{
	struct as3711 *as3711;
	struct as3711_platform_data *pdata;
	unsigned int id1, id2;
	int ret;

	if (!client->dev.of_node) {
		pdata = dev_get_platdata(&client->dev);
		if (!pdata)
			dev_dbg(&client->dev, "Platform data not found\n");
	} else {
		pdata = devm_kzalloc(&client->dev,
				     sizeof(*pdata), GFP_KERNEL);
		if (!pdata)
			return -ENOMEM;
	}

	as3711 = devm_kzalloc(&client->dev, sizeof(struct as3711), GFP_KERNEL);
	if (!as3711)
		return -ENOMEM;

	as3711->dev = &client->dev;
	i2c_set_clientdata(client, as3711);

	if (client->irq)
		dev_notice(&client->dev, "IRQ not supported yet\n");

	as3711->regmap = devm_regmap_init_i2c(client, &as3711_regmap_config);
	if (IS_ERR(as3711->regmap)) {
		ret = PTR_ERR(as3711->regmap);
		dev_err(&client->dev,
			"regmap initialization failed: %d\n", ret);
		return ret;
	}

	ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_1, &id1);
	if (!ret)
		ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_2, &id2);
	if (ret < 0) {
		dev_err(&client->dev, "regmap_read() failed: %d\n", ret);
		return ret;
	}
	if (id1 != 0x8b)
		return -ENODEV;
	dev_info(as3711->dev, "AS3711 detected: %x:%x\n", id1, id2);

	/*
	 * We can reuse as3711_subdevs[],
	 * it will be copied in mfd_add_devices()
	 */
	if (pdata) {
		as3711_subdevs[AS3711_REGULATOR].platform_data =
			&pdata->regulator;
		as3711_subdevs[AS3711_REGULATOR].pdata_size =
			sizeof(pdata->regulator);
		as3711_subdevs[AS3711_BACKLIGHT].platform_data =
			&pdata->backlight;
		as3711_subdevs[AS3711_BACKLIGHT].pdata_size =
			sizeof(pdata->backlight);
	} else {
		as3711_subdevs[AS3711_REGULATOR].platform_data = NULL;
		as3711_subdevs[AS3711_REGULATOR].pdata_size = 0;
		as3711_subdevs[AS3711_BACKLIGHT].platform_data = NULL;
		as3711_subdevs[AS3711_BACKLIGHT].pdata_size = 0;
	}

	ret = devm_mfd_add_devices(as3711->dev, -1, as3711_subdevs,
				   ARRAY_SIZE(as3711_subdevs), NULL, 0, NULL);
	if (ret < 0)
		dev_err(&client->dev, "add mfd devices failed: %d\n", ret);

	return ret;
}

static const struct i2c_device_id as3711_i2c_id[] = {
	{.name = "as3711", .driver_data = 0},
	{}
};

MODULE_DEVICE_TABLE(i2c, as3711_i2c_id);

static struct i2c_driver as3711_i2c_driver = {
	.driver = {
		   .name = "as3711",
		   .of_match_table = of_match_ptr(as3711_of_match),
	},
	.probe = as3711_i2c_probe,
	.id_table = as3711_i2c_id,
};

static int __init as3711_i2c_init(void)
{
	return i2c_add_driver(&as3711_i2c_driver);
}
/* Initialise early */
subsys_initcall(as3711_i2c_init);

static void __exit as3711_i2c_exit(void)
{
	i2c_del_driver(&as3711_i2c_driver);
}
module_exit(as3711_i2c_exit);

MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
MODULE_DESCRIPTION("AS3711 PMIC driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
acad189b GL	1	/*
	2	* AS3711 PMIC MFC driver
	3	*
	4	* Copyright (C) 2012 Renesas Electronics Corporation
	5	* Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the version 2 of the GNU General Public License as
	9	* published by the Free Software Foundation
	10	*/
	11
	12	#include <linux/device.h>
	13	#include <linux/err.h>
	14	#include <linux/i2c.h>
	15	#include <linux/init.h>
	16	#include <linux/kernel.h>
	17	#include <linux/mfd/as3711.h>
	18	#include <linux/mfd/core.h>
	19	#include <linux/module.h>
0af6f271	20	#include <linux/of.h>
acad189b GL	21	#include <linux/regmap.h>
	22	#include <linux/slab.h>
	23
	24	enum {
	25	AS3711_REGULATOR,
	26	AS3711_BACKLIGHT,
	27	};
	28
	29	/*
	30	* Ok to have it static: it is only used during probing and multiple I2C devices
	31	* cannot be probed simultaneously. Just make sure to avoid stale data.
	32	*/
	33	static struct mfd_cell as3711_subdevs[] = {
	34	[AS3711_REGULATOR] = {.name = "as3711-regulator",},
	35	[AS3711_BACKLIGHT] = {.name = "as3711-backlight",},
	36	};
	37
	38	static bool as3711_volatile_reg(struct device *dev, unsigned int reg)
	39	{
	40	switch (reg) {
	41	case AS3711_GPIO_SIGNAL_IN:
	42	case AS3711_INTERRUPT_STATUS_1:
	43	case AS3711_INTERRUPT_STATUS_2:
	44	case AS3711_INTERRUPT_STATUS_3:
	45	case AS3711_CHARGER_STATUS_1:
	46	case AS3711_CHARGER_STATUS_2:
	47	case AS3711_REG_STATUS:
	48	return true;
	49	}
	50	return false;
	51	}
	52
	53	static bool as3711_precious_reg(struct device *dev, unsigned int reg)
	54	{
	55	switch (reg) {
	56	case AS3711_INTERRUPT_STATUS_1:
	57	case AS3711_INTERRUPT_STATUS_2:
	58	case AS3711_INTERRUPT_STATUS_3:
	59	return true;
	60	}
	61	return false;
	62	}
	63
	64	static bool as3711_readable_reg(struct device *dev, unsigned int reg)
	65	{
	66	switch (reg) {
	67	case AS3711_SD_1_VOLTAGE:
	68	case AS3711_SD_2_VOLTAGE:
	69	case AS3711_SD_3_VOLTAGE:
	70	case AS3711_SD_4_VOLTAGE:
	71	case AS3711_LDO_1_VOLTAGE:
	72	case AS3711_LDO_2_VOLTAGE:
	73	case AS3711_LDO_3_VOLTAGE:
	74	case AS3711_LDO_4_VOLTAGE:
	75	case AS3711_LDO_5_VOLTAGE:
	76	case AS3711_LDO_6_VOLTAGE:
	77	case AS3711_LDO_7_VOLTAGE:
	78	case AS3711_LDO_8_VOLTAGE:
	79	case AS3711_SD_CONTROL:
	80	case AS3711_GPIO_SIGNAL_OUT:
	81	case AS3711_GPIO_SIGNAL_IN:
	82	case AS3711_SD_CONTROL_1:
	83	case AS3711_SD_CONTROL_2:
	84	case AS3711_CURR_CONTROL:
85	case AS3711_CURR1_VALUE:
86	case AS3711_CURR2_VALUE:
87	case AS3711_CURR3_VALUE:
88	case AS3711_STEPUP_CONTROL_1:
89	case AS3711_STEPUP_CONTROL_2:
90	case AS3711_STEPUP_CONTROL_4:
91	case AS3711_STEPUP_CONTROL_5:
92	case AS3711_REG_STATUS:
93	case AS3711_INTERRUPT_STATUS_1:
94	case AS3711_INTERRUPT_STATUS_2:
95	case AS3711_INTERRUPT_STATUS_3:
96	case AS3711_CHARGER_STATUS_1:
97	case AS3711_CHARGER_STATUS_2:
98	case AS3711_ASIC_ID_1:
99	case AS3711_ASIC_ID_2:
100	return true;
101	}
102	return false;
103	}
104
105	static const struct regmap_config as3711_regmap_config = {
106	.reg_bits = 8,
107	.val_bits = 8,
108	.volatile_reg = as3711_volatile_reg,
109	.readable_reg = as3711_readable_reg,
110	.precious_reg = as3711_precious_reg,
e9b7ba79 MS	111	.max_register = AS3711_MAX_REG,
e9b7ba79 MS	112	.num_reg_defaults_raw = AS3711_NUM_REGS,
acad189b GL	113	.cache_type = REGCACHE_RBTREE,
	114	};
	115
64710af3	116	#ifdef CONFIG_OF
44560303	117	static const struct of_device_id as3711_of_match[] = {
64710af3 GL	118	{.compatible = "ams,as3711",},
	119	{}
	120	};
	121	MODULE_DEVICE_TABLE(of, as3711_of_match);
	122	#endif
	123
acad189b GL	124	static int as3711_i2c_probe(struct i2c_client *client,
	125	const struct i2c_device_id *id)
	126	{
	127	struct as3711 *as3711;
64710af3	128	struct as3711_platform_data *pdata;
acad189b GL	129	unsigned int id1, id2;
	130	int ret;
	131
64710af3	132	if (!client->dev.of_node) {
334a41ce	133	pdata = dev_get_platdata(&client->dev);
64710af3 GL	134	if (!pdata)
	135	dev_dbg(&client->dev, "Platform data not found\n");
	136	} else {
	137	pdata = devm_kzalloc(&client->dev,
	138	sizeof(*pdata), GFP_KERNEL);
ae487ae2	139	if (!pdata)
64710af3	140	return -ENOMEM;
64710af3	141	}
acad189b GL	142
acad189b GL	143	as3711 = devm_kzalloc(&client->dev, sizeof(struct as3711), GFP_KERNEL);
ae487ae2	144	if (!as3711)
acad189b	145	return -ENOMEM;
acad189b GL	146
	147	as3711->dev = &client->dev;
	148	i2c_set_clientdata(client, as3711);
	149
	150	if (client->irq)
	151	dev_notice(&client->dev, "IRQ not supported yet\n");
	152
	153	as3711->regmap = devm_regmap_init_i2c(client, &as3711_regmap_config);
	154	if (IS_ERR(as3711->regmap)) {
	155	ret = PTR_ERR(as3711->regmap);
ae487ae2 LJ	156	dev_err(&client->dev,
ae487ae2 LJ	157	"regmap initialization failed: %d\n", ret);
acad189b GL	158	return ret;
	159	}
	160
	161	ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_1, &id1);
	162	if (!ret)
	163	ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_2, &id2);
	164	if (ret < 0) {
	165	dev_err(&client->dev, "regmap_read() failed: %d\n", ret);
	166	return ret;
	167	}
	168	if (id1 != 0x8b)
	169	return -ENODEV;
	170	dev_info(as3711->dev, "AS3711 detected: %x:%x\n", id1, id2);
	171
ae487ae2 LJ	172	/*
	173	* We can reuse as3711_subdevs[],
	174	* it will be copied in mfd_add_devices()
	175	*/
acad189b	176	if (pdata) {
ae487ae2 LJ	177	as3711_subdevs[AS3711_REGULATOR].platform_data =
	178	&pdata->regulator;
	179	as3711_subdevs[AS3711_REGULATOR].pdata_size =
	180	sizeof(pdata->regulator);
	181	as3711_subdevs[AS3711_BACKLIGHT].platform_data =
	182	&pdata->backlight;
	183	as3711_subdevs[AS3711_BACKLIGHT].pdata_size =
	184	sizeof(pdata->backlight);
acad189b GL	185	} else {
	186	as3711_subdevs[AS3711_REGULATOR].platform_data = NULL;
	187	as3711_subdevs[AS3711_REGULATOR].pdata_size = 0;
	188	as3711_subdevs[AS3711_BACKLIGHT].platform_data = NULL;
	189	as3711_subdevs[AS3711_BACKLIGHT].pdata_size = 0;
	190	}
	191
9c998326 LD	192	ret = devm_mfd_add_devices(as3711->dev, -1, as3711_subdevs,
9c998326 LD	193	ARRAY_SIZE(as3711_subdevs), NULL, 0, NULL);
acad189b GL	194	if (ret < 0)
	195	dev_err(&client->dev, "add mfd devices failed: %d\n", ret);
	196
	197	return ret;
	198	}
	199
acad189b GL	200	static const struct i2c_device_id as3711_i2c_id[] = {
	201	{.name = "as3711", .driver_data = 0},
	202	{}
	203	};
	204
	205	MODULE_DEVICE_TABLE(i2c, as3711_i2c_id);
	206
	207	static struct i2c_driver as3711_i2c_driver = {
	208	.driver = {
	209	.name = "as3711",
64710af3 GL	210	.of_match_table = of_match_ptr(as3711_of_match),
64710af3 GL	211	},
acad189b	212	.probe = as3711_i2c_probe,
acad189b GL	213	.id_table = as3711_i2c_id,
	214	};
	215
	216	static int __init as3711_i2c_init(void)
	217	{
	218	return i2c_add_driver(&as3711_i2c_driver);
	219	}
	220	/* Initialise early */
	221	subsys_initcall(as3711_i2c_init);
	222
	223	static void __exit as3711_i2c_exit(void)
	224	{
	225	i2c_del_driver(&as3711_i2c_driver);
	226	}
	227	module_exit(as3711_i2c_exit);
	228
	229	MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
	230	MODULE_DESCRIPTION("AS3711 PMIC driver");
	231	MODULE_LICENSE("GPL v2");