[GitHub/mt8127/android_kernel_alcatel_ttab.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/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_REGS,
	.num_reg_defaults_raw = AS3711_MAX_REGS,
	.cache_type = REGCACHE_RBTREE,
};

#ifdef CONFIG_OF
static 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 = client->dev.platform_data;
		if (!pdata)
			dev_dbg(&client->dev, "Platform data not found\n");
	} else {
		pdata = devm_kzalloc(&client->dev,
				     sizeof(*pdata), GFP_KERNEL);
		if (!pdata) {
			dev_err(&client->dev, "Failed to allocate pdata\n");
			return -ENOMEM;
		}
	}

	as3711 = devm_kzalloc(&client->dev, sizeof(struct as3711), GFP_KERNEL);
	if (!as3711) {
		dev_err(&client->dev, "Memory allocation failed\n");
		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 = 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 int as3711_i2c_remove(struct i2c_client *client)
{
	struct as3711 *as3711 = i2c_get_clientdata(client);

	mfd_remove_devices(as3711->dev);
	return 0;
}

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",
		   .owner = THIS_MODULE,
		   .of_match_table = of_match_ptr(as3711_of_match),
	},
	.probe = as3711_i2c_probe,
	.remove = as3711_i2c_remove,
	.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>
	20	#include <linux/regmap.h>
	21	#include <linux/slab.h>
	22
	23	enum {
	24	AS3711_REGULATOR,
	25	AS3711_BACKLIGHT,
	26	};
	27
	28	/*
	29	* Ok to have it static: it is only used during probing and multiple I2C devices
	30	* cannot be probed simultaneously. Just make sure to avoid stale data.
	31	*/
	32	static struct mfd_cell as3711_subdevs[] = {
	33	[AS3711_REGULATOR] = {.name = "as3711-regulator",},
	34	[AS3711_BACKLIGHT] = {.name = "as3711-backlight",},
	35	};
	36
	37	static bool as3711_volatile_reg(struct device *dev, unsigned int reg)
	38	{
	39	switch (reg) {
	40	case AS3711_GPIO_SIGNAL_IN:
	41	case AS3711_INTERRUPT_STATUS_1:
	42	case AS3711_INTERRUPT_STATUS_2:
	43	case AS3711_INTERRUPT_STATUS_3:
	44	case AS3711_CHARGER_STATUS_1:
	45	case AS3711_CHARGER_STATUS_2:
	46	case AS3711_REG_STATUS:
	47	return true;
	48	}
	49	return false;
	50	}
	51
	52	static bool as3711_precious_reg(struct device *dev, unsigned int reg)
	53	{
	54	switch (reg) {
	55	case AS3711_INTERRUPT_STATUS_1:
	56	case AS3711_INTERRUPT_STATUS_2:
	57	case AS3711_INTERRUPT_STATUS_3:
	58	return true;
	59	}
	60	return false;
	61	}
	62
	63	static bool as3711_readable_reg(struct device *dev, unsigned int reg)
	64	{
65	switch (reg) {
66	case AS3711_SD_1_VOLTAGE:
67	case AS3711_SD_2_VOLTAGE:
68	case AS3711_SD_3_VOLTAGE:
69	case AS3711_SD_4_VOLTAGE:
70	case AS3711_LDO_1_VOLTAGE:
71	case AS3711_LDO_2_VOLTAGE:
72	case AS3711_LDO_3_VOLTAGE:
73	case AS3711_LDO_4_VOLTAGE:
74	case AS3711_LDO_5_VOLTAGE:
75	case AS3711_LDO_6_VOLTAGE:
76	case AS3711_LDO_7_VOLTAGE:
77	case AS3711_LDO_8_VOLTAGE:
78	case AS3711_SD_CONTROL:
79	case AS3711_GPIO_SIGNAL_OUT:
80	case AS3711_GPIO_SIGNAL_IN:
81	case AS3711_SD_CONTROL_1:
82	case AS3711_SD_CONTROL_2:
83	case AS3711_CURR_CONTROL:
84	case AS3711_CURR1_VALUE:
85	case AS3711_CURR2_VALUE:
86	case AS3711_CURR3_VALUE:
87	case AS3711_STEPUP_CONTROL_1:
88	case AS3711_STEPUP_CONTROL_2:
89	case AS3711_STEPUP_CONTROL_4:
90	case AS3711_STEPUP_CONTROL_5:
91	case AS3711_REG_STATUS:
92	case AS3711_INTERRUPT_STATUS_1:
93	case AS3711_INTERRUPT_STATUS_2:
94	case AS3711_INTERRUPT_STATUS_3:
95	case AS3711_CHARGER_STATUS_1:
96	case AS3711_CHARGER_STATUS_2:
97	case AS3711_ASIC_ID_1:
98	case AS3711_ASIC_ID_2:
99	return true;
100	}
101	return false;
102	}
103
104	static const struct regmap_config as3711_regmap_config = {
105	.reg_bits = 8,
106	.val_bits = 8,
107	.volatile_reg = as3711_volatile_reg,
108	.readable_reg = as3711_readable_reg,
109	.precious_reg = as3711_precious_reg,
110	.max_register = AS3711_MAX_REGS,
111	.num_reg_defaults_raw = AS3711_MAX_REGS,
112	.cache_type = REGCACHE_RBTREE,
113	};
114
64710af3 GL	115	#ifdef CONFIG_OF
	116	static struct of_device_id as3711_of_match[] = {
	117	{.compatible = "ams,as3711",},
	118	{}
	119	};
	120	MODULE_DEVICE_TABLE(of, as3711_of_match);
	121	#endif
	122
acad189b GL	123	static int as3711_i2c_probe(struct i2c_client *client,
	124	const struct i2c_device_id *id)
	125	{
	126	struct as3711 *as3711;
64710af3	127	struct as3711_platform_data *pdata;
acad189b GL	128	unsigned int id1, id2;
	129	int ret;
	130
64710af3 GL	131	if (!client->dev.of_node) {
	132	pdata = client->dev.platform_data;
	133	if (!pdata)
	134	dev_dbg(&client->dev, "Platform data not found\n");
	135	} else {
	136	pdata = devm_kzalloc(&client->dev,
	137	sizeof(*pdata), GFP_KERNEL);
	138	if (!pdata) {
	139	dev_err(&client->dev, "Failed to allocate pdata\n");
	140	return -ENOMEM;
	141	}
	142	}
acad189b GL	143
	144	as3711 = devm_kzalloc(&client->dev, sizeof(struct as3711), GFP_KERNEL);
	145	if (!as3711) {
	146	dev_err(&client->dev, "Memory allocation failed\n");
	147	return -ENOMEM;
	148	}
	149
	150	as3711->dev = &client->dev;
	151	i2c_set_clientdata(client, as3711);
	152
	153	if (client->irq)
	154	dev_notice(&client->dev, "IRQ not supported yet\n");
	155
	156	as3711->regmap = devm_regmap_init_i2c(client, &as3711_regmap_config);
	157	if (IS_ERR(as3711->regmap)) {
	158	ret = PTR_ERR(as3711->regmap);
	159	dev_err(&client->dev, "regmap initialization failed: %d\n", ret);
	160	return ret;
	161	}
	162
	163	ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_1, &id1);
	164	if (!ret)
	165	ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_2, &id2);
	166	if (ret < 0) {
	167	dev_err(&client->dev, "regmap_read() failed: %d\n", ret);
	168	return ret;
	169	}
	170	if (id1 != 0x8b)
	171	return -ENODEV;
	172	dev_info(as3711->dev, "AS3711 detected: %x:%x\n", id1, id2);
	173
	174	/* We can reuse as3711_subdevs[], it will be copied in mfd_add_devices() */
	175	if (pdata) {
	176	as3711_subdevs[AS3711_REGULATOR].platform_data = &pdata->regulator;
	177	as3711_subdevs[AS3711_REGULATOR].pdata_size = sizeof(pdata->regulator);
	178	as3711_subdevs[AS3711_BACKLIGHT].platform_data = &pdata->backlight;
	179	as3711_subdevs[AS3711_BACKLIGHT].pdata_size = sizeof(pdata->backlight);
	180	} else {
	181	as3711_subdevs[AS3711_REGULATOR].platform_data = NULL;
	182	as3711_subdevs[AS3711_REGULATOR].pdata_size = 0;
	183	as3711_subdevs[AS3711_BACKLIGHT].platform_data = NULL;
	184	as3711_subdevs[AS3711_BACKLIGHT].pdata_size = 0;
	185	}
	186
	187	ret = mfd_add_devices(as3711->dev, -1, as3711_subdevs,
	188	ARRAY_SIZE(as3711_subdevs), NULL, 0, NULL);
	189	if (ret < 0)
	190	dev_err(&client->dev, "add mfd devices failed: %d\n", ret);
	191
	192	return ret;
	193	}
	194
	195	static int as3711_i2c_remove(struct i2c_client *client)
	196	{
	197	struct as3711 *as3711 = i2c_get_clientdata(client);
	198
	199	mfd_remove_devices(as3711->dev);
	200	return 0;
	201	}
	202
	203	static const struct i2c_device_id as3711_i2c_id[] = {
	204	{.name = "as3711", .driver_data = 0},
	205	{}
	206	};
207
208	MODULE_DEVICE_TABLE(i2c, as3711_i2c_id);
209
210	static struct i2c_driver as3711_i2c_driver = {
211	.driver = {
212	.name = "as3711",
213	.owner = THIS_MODULE,
64710af3 GL	214	.of_match_table = of_match_ptr(as3711_of_match),
64710af3 GL	215	},
acad189b GL	216	.probe = as3711_i2c_probe,
	217	.remove = as3711_i2c_remove,
	218	.id_table = as3711_i2c_id,
	219	};
	220
	221	static int __init as3711_i2c_init(void)
	222	{
	223	return i2c_add_driver(&as3711_i2c_driver);
	224	}
	225	/* Initialise early */
	226	subsys_initcall(as3711_i2c_init);
	227
	228	static void __exit as3711_i2c_exit(void)
	229	{
	230	i2c_del_driver(&as3711_i2c_driver);
	231	}
	232	module_exit(as3711_i2c_exit);
	233
	234	MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
	235	MODULE_DESCRIPTION("AS3711 PMIC driver");
	236	MODULE_LICENSE("GPL v2");