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
 25#ifdef CONFIG_OF
 26#include <linux/of.h>
 27#include <linux/of_device.h>
 28#endif
 29
 30static int da9052_i2c_enable_multiwrite(struct da9052 *da9052)
 31{
 32	int reg_val, ret;
 33
 34	ret = regmap_read(da9052->regmap, DA9052_CONTROL_B_REG, &reg_val);
 35	if (ret < 0)
 36		return ret;
 37
 38	if (reg_val & DA9052_CONTROL_B_WRITEMODE) {
 39		reg_val &= ~DA9052_CONTROL_B_WRITEMODE;
 40		ret = regmap_write(da9052->regmap, DA9052_CONTROL_B_REG,
 41				   reg_val);
 42		if (ret < 0)
 43			return ret;
 44	}
 45
 46	return 0;
 47}
 48
 49static struct i2c_device_id da9052_i2c_id[] = {
 50	{"da9052", DA9052},
 51	{"da9053-aa", DA9053_AA},
 52	{"da9053-ba", DA9053_BA},
 53	{"da9053-bb", DA9053_BB},
 54	{}
 55};
 56
 57#ifdef CONFIG_OF
 58static const struct of_device_id dialog_dt_ids[] = {
 59	{ .compatible = "dlg,da9052", .data = &da9052_i2c_id[0] },
 60	{ .compatible = "dlg,da9053-aa", .data = &da9052_i2c_id[1] },
 61	{ .compatible = "dlg,da9053-ab", .data = &da9052_i2c_id[2] },
 62	{ .compatible = "dlg,da9053-bb", .data = &da9052_i2c_id[3] },
 63	{ /* sentinel */ }
 64};
 65#endif
 66
 67static int __devinit da9052_i2c_probe(struct i2c_client *client,
 68				       const struct i2c_device_id *id)
 69{
 70	struct da9052 *da9052;
 71	int ret;
 72
 73	da9052 = devm_kzalloc(&client->dev, sizeof(struct da9052), GFP_KERNEL);
 74	if (!da9052)
 75		return -ENOMEM;
 76
 77	if (!i2c_check_functionality(client->adapter,
 78				     I2C_FUNC_SMBUS_BYTE_DATA)) {
 79		dev_info(&client->dev, "Error in %s:i2c_check_functionality\n",
 80			 __func__);
 81		return  -ENODEV;
 82	}
 83
 84	da9052->dev = &client->dev;
 85	da9052->chip_irq = client->irq;
 86
 87	i2c_set_clientdata(client, da9052);
 88
 89	da9052->regmap = devm_regmap_init_i2c(client, &da9052_regmap_config);
 90	if (IS_ERR(da9052->regmap)) {
 91		ret = PTR_ERR(da9052->regmap);
 92		dev_err(&client->dev, "Failed to allocate register map: %d\n",
 93			ret);
 94		return ret;
 95	}
 96
 97	ret = da9052_i2c_enable_multiwrite(da9052);
 98	if (ret < 0)
 99		return ret;
100
101#ifdef CONFIG_OF
102	if (!id) {
103		struct device_node *np = client->dev.of_node;
104		const struct of_device_id *deviceid;
105
106		deviceid = of_match_node(dialog_dt_ids, np);
107		id = (const struct i2c_device_id *)deviceid->data;
108	}
109#endif
110
111	if (!id) {
112		ret = -ENODEV;
113		dev_err(&client->dev, "id is null.\n");
114		return ret;
115	}
116
117	ret = da9052_device_init(da9052, id->driver_data);
118	if (ret != 0)
119		return ret;
120
121	return 0;
122}
123
124static int __devexit da9052_i2c_remove(struct i2c_client *client)
125{
126	struct da9052 *da9052 = i2c_get_clientdata(client);
127
128	da9052_device_exit(da9052);
129	return 0;
130}
131
132static struct i2c_driver da9052_i2c_driver = {
133	.probe = da9052_i2c_probe,
134	.remove = __devexit_p(da9052_i2c_remove),
135	.id_table = da9052_i2c_id,
136	.driver = {
137		.name = "da9052",
138		.owner = THIS_MODULE,
139#ifdef CONFIG_OF
140		.of_match_table = dialog_dt_ids,
141#endif
142	},
143};
144
145static int __init da9052_i2c_init(void)
146{
147	int ret;
148
149	ret = i2c_add_driver(&da9052_i2c_driver);
150	if (ret != 0) {
151		pr_err("DA9052 I2C registration failed %d\n", ret);
152		return ret;
153	}
154
155	return 0;
156}
157subsys_initcall(da9052_i2c_init);
158
159static void __exit da9052_i2c_exit(void)
160{
161	i2c_del_driver(&da9052_i2c_driver);
162}
163module_exit(da9052_i2c_exit);
164
165MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
166MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC");
167MODULE_LICENSE("GPL");