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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
Ying-Chun Liu (PaulLiu)58d114b2012-04-16 00:01:50 +080025#ifdef CONFIG_OF
26#include <linux/of.h>
27#include <linux/of_device.h>
28#endif
29
Ashish Jangam84c99db2011-12-12 20:06:56 +053030static 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
Ying-Chun Liu (PaulLiu)58d114b2012-04-16 00:01:50 +080049static 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
Ashish Jangam84c99db2011-12-12 20:06:56 +053067static 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
Axel Lin6608a5e2012-05-11 09:29:51 +080073 da9052 = devm_kzalloc(&client->dev, sizeof(struct da9052), GFP_KERNEL);
Ashish Jangam84c99db2011-12-12 20:06:56 +053074 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__);
Axel Lin6608a5e2012-05-11 09:29:51 +080081 return -ENODEV;
Ashish Jangam84c99db2011-12-12 20:06:56 +053082 }
83
84 da9052->dev = &client->dev;
85 da9052->chip_irq = client->irq;
86
87 i2c_set_clientdata(client, da9052);
88
Axel Lin6608a5e2012-05-11 09:29:51 +080089 da9052->regmap = devm_regmap_init_i2c(client, &da9052_regmap_config);
Ashish Jangam84c99db2011-12-12 20:06:56 +053090 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);
Axel Lin6608a5e2012-05-11 09:29:51 +080094 return ret;
Ashish Jangam84c99db2011-12-12 20:06:56 +053095 }
96
97 ret = da9052_i2c_enable_multiwrite(da9052);
98 if (ret < 0)
Axel Lin6608a5e2012-05-11 09:29:51 +080099 return ret;
Ashish Jangam84c99db2011-12-12 20:06:56 +0530100
Ying-Chun Liu (PaulLiu)58d114b2012-04-16 00:01:50 +0800101#ifdef CONFIG_OF
102 if (!id) {
103 struct device_node *np = client->dev.of_node;
104 const struct of_device_id *deviceid;
105
Olof Johansson9e69ab42012-05-05 16:02:48 -0700106 deviceid = of_match_node(dialog_dt_ids, np);
Ying-Chun Liu (PaulLiu)58d114b2012-04-16 00:01:50 +0800107 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");
Axel Lin6608a5e2012-05-11 09:29:51 +0800114 return ret;
Ying-Chun Liu (PaulLiu)58d114b2012-04-16 00:01:50 +0800115 }
116
Ashish Jangam84c99db2011-12-12 20:06:56 +0530117 ret = da9052_device_init(da9052, id->driver_data);
118 if (ret != 0)
Axel Lin6608a5e2012-05-11 09:29:51 +0800119 return ret;
Ashish Jangam84c99db2011-12-12 20:06:56 +0530120
121 return 0;
Ashish Jangam84c99db2011-12-12 20:06:56 +0530122}
123
Dmitry Torokhovbcc2d6d2012-03-17 16:01:09 -0700124static int __devexit da9052_i2c_remove(struct i2c_client *client)
Ashish Jangam84c99db2011-12-12 20:06:56 +0530125{
126 struct da9052 *da9052 = i2c_get_clientdata(client);
127
128 da9052_device_exit(da9052);
Ashish Jangam84c99db2011-12-12 20:06:56 +0530129 return 0;
130}
131
Ashish Jangam84c99db2011-12-12 20:06:56 +0530132static struct i2c_driver da9052_i2c_driver = {
133 .probe = da9052_i2c_probe,
Dmitry Torokhovbcc2d6d2012-03-17 16:01:09 -0700134 .remove = __devexit_p(da9052_i2c_remove),
Ashish Jangam84c99db2011-12-12 20:06:56 +0530135 .id_table = da9052_i2c_id,
136 .driver = {
137 .name = "da9052",
138 .owner = THIS_MODULE,
Ying-Chun Liu (PaulLiu)58d114b2012-04-16 00:01:50 +0800139#ifdef CONFIG_OF
140 .of_match_table = dialog_dt_ids,
141#endif
Ashish Jangam84c99db2011-12-12 20:06:56 +0530142 },
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");