blob: 36b88e395499f1673ecb57eee39b0c6a3fa920cd [file] [log] [blame]
Ashish Jangam84c99db2011-12-12 20:06:56 +05301/*
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
25static int da9052_i2c_enable_multiwrite(struct da9052 *da9052)
26{
27 int reg_val, ret;
28
29 ret = regmap_read(da9052->regmap, DA9052_CONTROL_B_REG, &reg_val);
30 if (ret < 0)
31 return ret;
32
33 if (reg_val & DA9052_CONTROL_B_WRITEMODE) {
34 reg_val &= ~DA9052_CONTROL_B_WRITEMODE;
35 ret = regmap_write(da9052->regmap, DA9052_CONTROL_B_REG,
36 reg_val);
37 if (ret < 0)
38 return ret;
39 }
40
41 return 0;
42}
43
44static int __devinit da9052_i2c_probe(struct i2c_client *client,
45 const struct i2c_device_id *id)
46{
47 struct da9052 *da9052;
48 int ret;
49
50 da9052 = kzalloc(sizeof(struct da9052), GFP_KERNEL);
51 if (!da9052)
52 return -ENOMEM;
53
54 if (!i2c_check_functionality(client->adapter,
55 I2C_FUNC_SMBUS_BYTE_DATA)) {
56 dev_info(&client->dev, "Error in %s:i2c_check_functionality\n",
57 __func__);
58 ret = -ENODEV;
59 goto err;
60 }
61
62 da9052->dev = &client->dev;
63 da9052->chip_irq = client->irq;
64
65 i2c_set_clientdata(client, da9052);
66
67 da9052->regmap = regmap_init_i2c(client, &da9052_regmap_config);
68 if (IS_ERR(da9052->regmap)) {
69 ret = PTR_ERR(da9052->regmap);
70 dev_err(&client->dev, "Failed to allocate register map: %d\n",
71 ret);
72 goto err;
73 }
74
75 ret = da9052_i2c_enable_multiwrite(da9052);
76 if (ret < 0)
Axel Lin4d75dd62012-01-10 15:09:56 +080077 goto err_regmap;
Ashish Jangam84c99db2011-12-12 20:06:56 +053078
79 ret = da9052_device_init(da9052, id->driver_data);
80 if (ret != 0)
Axel Lin4d75dd62012-01-10 15:09:56 +080081 goto err_regmap;
Ashish Jangam84c99db2011-12-12 20:06:56 +053082
83 return 0;
84
Axel Lin4d75dd62012-01-10 15:09:56 +080085err_regmap:
86 regmap_exit(da9052->regmap);
Ashish Jangam84c99db2011-12-12 20:06:56 +053087err:
88 kfree(da9052);
89 return ret;
90}
91
Dmitry Torokhovbcc2d6d2012-03-17 16:01:09 -070092static int __devexit da9052_i2c_remove(struct i2c_client *client)
Ashish Jangam84c99db2011-12-12 20:06:56 +053093{
94 struct da9052 *da9052 = i2c_get_clientdata(client);
95
96 da9052_device_exit(da9052);
Axel Lin4d75dd62012-01-10 15:09:56 +080097 regmap_exit(da9052->regmap);
Ashish Jangam84c99db2011-12-12 20:06:56 +053098 kfree(da9052);
99
100 return 0;
101}
102
103static struct i2c_device_id da9052_i2c_id[] = {
104 {"da9052", DA9052},
105 {"da9053-aa", DA9053_AA},
106 {"da9053-ba", DA9053_BA},
107 {"da9053-bb", DA9053_BB},
108 {}
109};
110
111static struct i2c_driver da9052_i2c_driver = {
112 .probe = da9052_i2c_probe,
Dmitry Torokhovbcc2d6d2012-03-17 16:01:09 -0700113 .remove = __devexit_p(da9052_i2c_remove),
Ashish Jangam84c99db2011-12-12 20:06:56 +0530114 .id_table = da9052_i2c_id,
115 .driver = {
116 .name = "da9052",
117 .owner = THIS_MODULE,
118 },
119};
120
121static int __init da9052_i2c_init(void)
122{
123 int ret;
124
125 ret = i2c_add_driver(&da9052_i2c_driver);
126 if (ret != 0) {
127 pr_err("DA9052 I2C registration failed %d\n", ret);
128 return ret;
129 }
130
131 return 0;
132}
133subsys_initcall(da9052_i2c_init);
134
135static void __exit da9052_i2c_exit(void)
136{
137 i2c_del_driver(&da9052_i2c_driver);
138}
139module_exit(da9052_i2c_exit);
140
141MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
142MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC");
143MODULE_LICENSE("GPL");