[linux-2.6-block.git] / drivers / mfd / da9052-i2c.c

/*
 * I2C access for DA9052 PMICs.
 *
 * Copyright(c) 2011 Dialog Semiconductor Ltd.
 *
 * Author: David Dajun Chen <dchen@diasemi.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; either version 2 of the License, or
 * (at your option) any later version.
 *
 */

#include <linux/device.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/mfd/core.h>
#include <linux/i2c.h>
#include <linux/err.h>

#include <linux/mfd/da9052/da9052.h>
#include <linux/mfd/da9052/reg.h>

#ifdef CONFIG_OF
#include <linux/of.h>
#include <linux/of_device.h>
#endif

/* I2C safe register check */
static inline bool i2c_safe_reg(unsigned char reg)
{
	switch (reg) {
	case DA9052_STATUS_A_REG:
	case DA9052_STATUS_B_REG:
	case DA9052_STATUS_C_REG:
	case DA9052_STATUS_D_REG:
	case DA9052_ADC_RES_L_REG:
	case DA9052_ADC_RES_H_REG:
	case DA9052_VDD_RES_REG:
	case DA9052_ICHG_AV_REG:
	case DA9052_TBAT_RES_REG:
	case DA9052_ADCIN4_RES_REG:
	case DA9052_ADCIN5_RES_REG:
	case DA9052_ADCIN6_RES_REG:
	case DA9052_TJUNC_RES_REG:
	case DA9052_TSI_X_MSB_REG:
	case DA9052_TSI_Y_MSB_REG:
	case DA9052_TSI_LSB_REG:
	case DA9052_TSI_Z_MSB_REG:
		return true;
	default:
		return false;
	}
}

/*
 * There is an issue with DA9052 and DA9053_AA/BA/BB PMIC where the PMIC
 * gets lockup up or fails to respond following a system reset.
 * This fix is to follow any read or write with a dummy read to a safe
 * register.
 */
static int da9052_i2c_fix(struct da9052 *da9052, unsigned char reg)
{
	int val;

	switch (da9052->chip_id) {
	case DA9052:
	case DA9053_AA:
	case DA9053_BA:
	case DA9053_BB:
		/* A dummy read to a safe register address. */
		if (!i2c_safe_reg(reg))
			return regmap_read(da9052->regmap,
					   DA9052_PARK_REGISTER,
					   &val);
		break;
	case DA9053_BC:
	default:
		/*
		 * For other chips parking of I2C register
		 * to a safe place is not required.
		 */
		break;
	}

	return 0;
}

/*
 * According to errata item 24, multiwrite mode should be avoided
 * in order to prevent register data corruption after power-down.
 */
static int da9052_i2c_disable_multiwrite(struct da9052 *da9052)
{
	int reg_val, ret;

	ret = regmap_read(da9052->regmap, DA9052_CONTROL_B_REG, &reg_val);
	if (ret < 0)
		return ret;

	if (!(reg_val & DA9052_CONTROL_B_WRITEMODE)) {
		reg_val |= DA9052_CONTROL_B_WRITEMODE;
		ret = regmap_write(da9052->regmap, DA9052_CONTROL_B_REG,
				   reg_val);
		if (ret < 0)
			return ret;
	}

	return 0;
}

static const struct i2c_device_id da9052_i2c_id[] = {
	{"da9052", DA9052},
	{"da9053-aa", DA9053_AA},
	{"da9053-ba", DA9053_BA},
	{"da9053-bb", DA9053_BB},
	{"da9053-bc", DA9053_BC},
	{}
};

#ifdef CONFIG_OF
static const struct of_device_id dialog_dt_ids[] = {
	{ .compatible = "dlg,da9052", .data = &da9052_i2c_id[0] },
	{ .compatible = "dlg,da9053-aa", .data = &da9052_i2c_id[1] },
	{ .compatible = "dlg,da9053-ba", .data = &da9052_i2c_id[2] },
	{ .compatible = "dlg,da9053-bb", .data = &da9052_i2c_id[3] },
	{ .compatible = "dlg,da9053-bc", .data = &da9052_i2c_id[4] },
	{ /* sentinel */ }
};
#endif

static int da9052_i2c_probe(struct i2c_client *client,
				       const struct i2c_device_id *id)
{
	struct da9052 *da9052;
	int ret;

	da9052 = devm_kzalloc(&client->dev, sizeof(struct da9052), GFP_KERNEL);
	if (!da9052)
		return -ENOMEM;

	da9052->dev = &client->dev;
	da9052->chip_irq = client->irq;
	da9052->fix_io = da9052_i2c_fix;

	i2c_set_clientdata(client, da9052);

	da9052->regmap = devm_regmap_init_i2c(client, &da9052_regmap_config);
	if (IS_ERR(da9052->regmap)) {
		ret = PTR_ERR(da9052->regmap);
		dev_err(&client->dev, "Failed to allocate register map: %d\n",
			ret);
		return ret;
	}

	ret = da9052_i2c_disable_multiwrite(da9052);
	if (ret < 0)
		return ret;

#ifdef CONFIG_OF
	if (!id) {
		struct device_node *np = client->dev.of_node;
		const struct of_device_id *deviceid;

		deviceid = of_match_node(dialog_dt_ids, np);
		id = deviceid->data;
	}
#endif

	if (!id) {
		ret = -ENODEV;
		dev_err(&client->dev, "id is null.\n");
		return ret;
	}

	return da9052_device_init(da9052, id->driver_data);
}

static int da9052_i2c_remove(struct i2c_client *client)
{
	struct da9052 *da9052 = i2c_get_clientdata(client);

	da9052_device_exit(da9052);
	return 0;
}

static struct i2c_driver da9052_i2c_driver = {
	.probe = da9052_i2c_probe,
	.remove = da9052_i2c_remove,
	.id_table = da9052_i2c_id,
	.driver = {
		.name = "da9052",
#ifdef CONFIG_OF
		.of_match_table = dialog_dt_ids,
#endif
	},
};

static int __init da9052_i2c_init(void)
{
	int ret;

	ret = i2c_add_driver(&da9052_i2c_driver);
	if (ret != 0) {
		pr_err("DA9052 I2C registration failed %d\n", ret);
		return ret;
	}

	return 0;
}
subsys_initcall(da9052_i2c_init);

static void __exit da9052_i2c_exit(void)
{
	i2c_del_driver(&da9052_i2c_driver);
}
module_exit(da9052_i2c_exit);

MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC");
MODULE_LICENSE("GPL");
Commit	Line	Data
84c99db8 AJ	1	/*
	2	* I2C access for DA9052 PMICs.
	3	*
	4	* Copyright(c) 2011 Dialog Semiconductor Ltd.
	5	*
	6	* Author: David Dajun Chen <dchen@diasemi.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	*/
	14
	15	#include <linux/device.h>
	16	#include <linux/module.h>
	17	#include <linux/input.h>
	18	#include <linux/mfd/core.h>
	19	#include <linux/i2c.h>
	20	#include <linux/err.h>
	21
	22	#include <linux/mfd/da9052/da9052.h>
	23	#include <linux/mfd/da9052/reg.h>
	24
58d114b6 YCLP	25	#ifdef CONFIG_OF
	26	#include <linux/of.h>
	27	#include <linux/of_device.h>
	28	#endif
	29
0a8c290a AJ	30	/* I2C safe register check */
	31	static inline bool i2c_safe_reg(unsigned char reg)
	32	{
	33	switch (reg) {
	34	case DA9052_STATUS_A_REG:
	35	case DA9052_STATUS_B_REG:
	36	case DA9052_STATUS_C_REG:
	37	case DA9052_STATUS_D_REG:
	38	case DA9052_ADC_RES_L_REG:
	39	case DA9052_ADC_RES_H_REG:
	40	case DA9052_VDD_RES_REG:
	41	case DA9052_ICHG_AV_REG:
	42	case DA9052_TBAT_RES_REG:
	43	case DA9052_ADCIN4_RES_REG:
	44	case DA9052_ADCIN5_RES_REG:
	45	case DA9052_ADCIN6_RES_REG:
	46	case DA9052_TJUNC_RES_REG:
	47	case DA9052_TSI_X_MSB_REG:
	48	case DA9052_TSI_Y_MSB_REG:
	49	case DA9052_TSI_LSB_REG:
	50	case DA9052_TSI_Z_MSB_REG:
	51	return true;
	52	default:
	53	return false;
	54	}
	55	}
	56
	57	/*
	58	* There is an issue with DA9052 and DA9053_AA/BA/BB PMIC where the PMIC
	59	* gets lockup up or fails to respond following a system reset.
	60	* This fix is to follow any read or write with a dummy read to a safe
	61	* register.
	62	*/
c3e9e6b6	63	static int da9052_i2c_fix(struct da9052 *da9052, unsigned char reg)
0a8c290a AJ	64	{
	65	int val;
	66
	67	switch (da9052->chip_id) {
	68	case DA9052:
	69	case DA9053_AA:
	70	case DA9053_BA:
	71	case DA9053_BB:
	72	/* A dummy read to a safe register address. */
5b7b2ac1	73	if (!i2c_safe_reg(reg))
0a8c290a AJ	74	return regmap_read(da9052->regmap,
	75	DA9052_PARK_REGISTER,
	76	&val);
	77	break;
6c049b2a	78	case DA9053_BC:
0a8c290a AJ	79	default:
	80	/*
	81	* For other chips parking of I2C register
	82	* to a safe place is not required.
	83	*/
	84	break;
	85	}
	86
	87	return 0;
	88	}
0a8c290a	89
43e30f23 DJ	90	/*
	91	* According to errata item 24, multiwrite mode should be avoided
	92	* in order to prevent register data corruption after power-down.
	93	*/
	94	static int da9052_i2c_disable_multiwrite(struct da9052 *da9052)
84c99db8 AJ	95	{
	96	int reg_val, ret;
	97
	98	ret = regmap_read(da9052->regmap, DA9052_CONTROL_B_REG, &reg_val);
	99	if (ret < 0)
	100	return ret;
	101
43e30f23 DJ	102	if (!(reg_val & DA9052_CONTROL_B_WRITEMODE)) {
43e30f23 DJ	103	reg_val \|= DA9052_CONTROL_B_WRITEMODE;
84c99db8 AJ	104	ret = regmap_write(da9052->regmap, DA9052_CONTROL_B_REG,
	105	reg_val);
	106	if (ret < 0)
	107	return ret;
	108	}
	109
	110	return 0;
	111	}
	112
e27d650b	113	static const struct i2c_device_id da9052_i2c_id[] = {
58d114b6 YCLP	114	{"da9052", DA9052},
	115	{"da9053-aa", DA9053_AA},
	116	{"da9053-ba", DA9053_BA},
	117	{"da9053-bb", DA9053_BB},
6c049b2a	118	{"da9053-bc", DA9053_BC},
58d114b6 YCLP	119	{}
	120	};
	121
	122	#ifdef CONFIG_OF
	123	static const struct of_device_id dialog_dt_ids[] = {
	124	{ .compatible = "dlg,da9052", .data = &da9052_i2c_id[0] },
	125	{ .compatible = "dlg,da9053-aa", .data = &da9052_i2c_id[1] },
6c049b2a	126	{ .compatible = "dlg,da9053-ba", .data = &da9052_i2c_id[2] },
58d114b6	127	{ .compatible = "dlg,da9053-bb", .data = &da9052_i2c_id[3] },
6c049b2a	128	{ .compatible = "dlg,da9053-bc", .data = &da9052_i2c_id[4] },
58d114b6 YCLP	129	{ /* sentinel */ }
	130	};
	131	#endif
	132
f791be49	133	static int da9052_i2c_probe(struct i2c_client *client,
84c99db8 AJ	134	const struct i2c_device_id *id)
	135	{
	136	struct da9052 *da9052;
	137	int ret;
	138
6608a5e2	139	da9052 = devm_kzalloc(&client->dev, sizeof(struct da9052), GFP_KERNEL);
84c99db8 AJ	140	if (!da9052)
	141	return -ENOMEM;
	142
84c99db8 AJ	143	da9052->dev = &client->dev;
84c99db8 AJ	144	da9052->chip_irq = client->irq;
0a8c290a	145	da9052->fix_io = da9052_i2c_fix;
84c99db8 AJ	146
	147	i2c_set_clientdata(client, da9052);
	148
6608a5e2	149	da9052->regmap = devm_regmap_init_i2c(client, &da9052_regmap_config);
84c99db8 AJ	150	if (IS_ERR(da9052->regmap)) {
	151	ret = PTR_ERR(da9052->regmap);
	152	dev_err(&client->dev, "Failed to allocate register map: %d\n",
	153	ret);
6608a5e2	154	return ret;
84c99db8 AJ	155	}
84c99db8 AJ	156
43e30f23	157	ret = da9052_i2c_disable_multiwrite(da9052);
84c99db8	158	if (ret < 0)
6608a5e2	159	return ret;
84c99db8	160
58d114b6 YCLP	161	#ifdef CONFIG_OF
	162	if (!id) {
	163	struct device_node *np = client->dev.of_node;
	164	const struct of_device_id *deviceid;
	165
9e69ab41	166	deviceid = of_match_node(dialog_dt_ids, np);
e27d650b	167	id = deviceid->data;
58d114b6 YCLP	168	}
	169	#endif
	170
	171	if (!id) {
	172	ret = -ENODEV;
	173	dev_err(&client->dev, "id is null.\n");
6608a5e2	174	return ret;
58d114b6 YCLP	175	}
58d114b6 YCLP	176
ad698ea4	177	return da9052_device_init(da9052, id->driver_data);
84c99db8 AJ	178	}
84c99db8 AJ	179
4740f73f	180	static int da9052_i2c_remove(struct i2c_client *client)
84c99db8 AJ	181	{
	182	struct da9052 *da9052 = i2c_get_clientdata(client);
	183
	184	da9052_device_exit(da9052);
84c99db8 AJ	185	return 0;
	186	}
	187
84c99db8 AJ	188	static struct i2c_driver da9052_i2c_driver = {
84c99db8 AJ	189	.probe = da9052_i2c_probe,
84449216	190	.remove = da9052_i2c_remove,
84c99db8 AJ	191	.id_table = da9052_i2c_id,
	192	.driver = {
	193	.name = "da9052",
58d114b6 YCLP	194	#ifdef CONFIG_OF
	195	.of_match_table = dialog_dt_ids,
	196	#endif
84c99db8 AJ	197	},
	198	};
	199
	200	static int __init da9052_i2c_init(void)
	201	{
	202	int ret;
	203
	204	ret = i2c_add_driver(&da9052_i2c_driver);
	205	if (ret != 0) {
	206	pr_err("DA9052 I2C registration failed %d\n", ret);
	207	return ret;
	208	}
	209
	210	return 0;
	211	}
	212	subsys_initcall(da9052_i2c_init);
	213
	214	static void __exit da9052_i2c_exit(void)
	215	{
	216	i2c_del_driver(&da9052_i2c_driver);
	217	}
	218	module_exit(da9052_i2c_exit);
	219
	220	MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
	221	MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC");
	222	MODULE_LICENSE("GPL");