[mirror_ubuntu-artful-kernel.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;
	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},
	{}
};

#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-ab", .data = &da9052_i2c_id[2] },
	{ .compatible = "dlg,da9053-bb", .data = &da9052_i2c_id[3] },
	{ /* 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;

	if (!i2c_check_functionality(client->adapter,
				     I2C_FUNC_SMBUS_BYTE_DATA)) {
		dev_info(&client->dev, "Error in %s:i2c_check_functionality\n",
			 __func__);
		return  -ENODEV;
	}

	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;
	}

	ret = da9052_device_init(da9052, id->driver_data);
	if (ret != 0)
		return ret;

	return 0;
}

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",
		.owner = THIS_MODULE,
#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. */
	73	if (!i2c_safe_reg(reg))
	74	return regmap_read(da9052->regmap,
	75	DA9052_PARK_REGISTER,
	76	&val);
	77	break;
	78	default:
	79	/*
	80	* For other chips parking of I2C register
	81	* to a safe place is not required.
	82	*/
	83	break;
	84	}
	85
	86	return 0;
	87	}
0a8c290a	88
43e30f23 DJ	89	/*
	90	* According to errata item 24, multiwrite mode should be avoided
	91	* in order to prevent register data corruption after power-down.
	92	*/
	93	static int da9052_i2c_disable_multiwrite(struct da9052 *da9052)
84c99db8 AJ	94	{
	95	int reg_val, ret;
	96
	97	ret = regmap_read(da9052->regmap, DA9052_CONTROL_B_REG, &reg_val);
	98	if (ret < 0)
	99	return ret;
	100
43e30f23 DJ	101	if (!(reg_val & DA9052_CONTROL_B_WRITEMODE)) {
43e30f23 DJ	102	reg_val \|= DA9052_CONTROL_B_WRITEMODE;
84c99db8 AJ	103	ret = regmap_write(da9052->regmap, DA9052_CONTROL_B_REG,
	104	reg_val);
	105	if (ret < 0)
	106	return ret;
	107	}
	108
	109	return 0;
	110	}
	111
e27d650b	112	static const struct i2c_device_id da9052_i2c_id[] = {
58d114b6 YCLP	113	{"da9052", DA9052},
	114	{"da9053-aa", DA9053_AA},
	115	{"da9053-ba", DA9053_BA},
	116	{"da9053-bb", DA9053_BB},
	117	{}
	118	};
	119
	120	#ifdef CONFIG_OF
	121	static const struct of_device_id dialog_dt_ids[] = {
	122	{ .compatible = "dlg,da9052", .data = &da9052_i2c_id[0] },
	123	{ .compatible = "dlg,da9053-aa", .data = &da9052_i2c_id[1] },
	124	{ .compatible = "dlg,da9053-ab", .data = &da9052_i2c_id[2] },
	125	{ .compatible = "dlg,da9053-bb", .data = &da9052_i2c_id[3] },
	126	{ /* sentinel */ }
	127	};
	128	#endif
	129
f791be49	130	static int da9052_i2c_probe(struct i2c_client *client,
84c99db8 AJ	131	const struct i2c_device_id *id)
	132	{
	133	struct da9052 *da9052;
	134	int ret;
	135
6608a5e2	136	da9052 = devm_kzalloc(&client->dev, sizeof(struct da9052), GFP_KERNEL);
84c99db8 AJ	137	if (!da9052)
	138	return -ENOMEM;
	139
	140	if (!i2c_check_functionality(client->adapter,
	141	I2C_FUNC_SMBUS_BYTE_DATA)) {
	142	dev_info(&client->dev, "Error in %s:i2c_check_functionality\n",
	143	__func__);
6608a5e2	144	return -ENODEV;
84c99db8 AJ	145	}
	146
	147	da9052->dev = &client->dev;
	148	da9052->chip_irq = client->irq;
0a8c290a	149	da9052->fix_io = da9052_i2c_fix;
84c99db8 AJ	150
	151	i2c_set_clientdata(client, da9052);
	152
6608a5e2	153	da9052->regmap = devm_regmap_init_i2c(client, &da9052_regmap_config);
84c99db8 AJ	154	if (IS_ERR(da9052->regmap)) {
	155	ret = PTR_ERR(da9052->regmap);
	156	dev_err(&client->dev, "Failed to allocate register map: %d\n",
	157	ret);
6608a5e2	158	return ret;
84c99db8 AJ	159	}
84c99db8 AJ	160
43e30f23	161	ret = da9052_i2c_disable_multiwrite(da9052);
84c99db8	162	if (ret < 0)
6608a5e2	163	return ret;
84c99db8	164
58d114b6 YCLP	165	#ifdef CONFIG_OF
	166	if (!id) {
	167	struct device_node *np = client->dev.of_node;
	168	const struct of_device_id *deviceid;
	169
9e69ab41	170	deviceid = of_match_node(dialog_dt_ids, np);
e27d650b	171	id = deviceid->data;
58d114b6 YCLP	172	}
	173	#endif
	174
	175	if (!id) {
	176	ret = -ENODEV;
	177	dev_err(&client->dev, "id is null.\n");
6608a5e2	178	return ret;
58d114b6 YCLP	179	}
58d114b6 YCLP	180
84c99db8 AJ	181	ret = da9052_device_init(da9052, id->driver_data);
84c99db8 AJ	182	if (ret != 0)
6608a5e2	183	return ret;
84c99db8 AJ	184
84c99db8 AJ	185	return 0;
84c99db8 AJ	186	}
84c99db8 AJ	187
4740f73f	188	static int da9052_i2c_remove(struct i2c_client *client)
84c99db8 AJ	189	{
	190	struct da9052 *da9052 = i2c_get_clientdata(client);
	191
	192	da9052_device_exit(da9052);
84c99db8 AJ	193	return 0;
	194	}
	195
84c99db8 AJ	196	static struct i2c_driver da9052_i2c_driver = {
84c99db8 AJ	197	.probe = da9052_i2c_probe,
84449216	198	.remove = da9052_i2c_remove,
84c99db8 AJ	199	.id_table = da9052_i2c_id,
	200	.driver = {
	201	.name = "da9052",
	202	.owner = THIS_MODULE,
58d114b6 YCLP	203	#ifdef CONFIG_OF
	204	.of_match_table = dialog_dt_ids,
	205	#endif
84c99db8 AJ	206	},
	207	};
	208
	209	static int __init da9052_i2c_init(void)
	210	{
	211	int ret;
	212
	213	ret = i2c_add_driver(&da9052_i2c_driver);
	214	if (ret != 0) {
	215	pr_err("DA9052 I2C registration failed %d\n", ret);
	216	return ret;
	217	}
	218
	219	return 0;
	220	}
	221	subsys_initcall(da9052_i2c_init);
	222
	223	static void __exit da9052_i2c_exit(void)
	224	{
	225	i2c_del_driver(&da9052_i2c_driver);
	226	}
	227	module_exit(da9052_i2c_exit);
	228
	229	MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
	230	MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC");
	231	MODULE_LICENSE("GPL");