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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 | static 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, ®_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 | ||
44 | static 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) | |
77 | goto err; | |
78 | ||
79 | ret = da9052_device_init(da9052, id->driver_data); | |
80 | if (ret != 0) | |
81 | goto err; | |
82 | ||
83 | return 0; | |
84 | ||
85 | err: | |
86 | kfree(da9052); | |
87 | return ret; | |
88 | } | |
89 | ||
90 | static int da9052_i2c_remove(struct i2c_client *client) | |
91 | { | |
92 | struct da9052 *da9052 = i2c_get_clientdata(client); | |
93 | ||
94 | da9052_device_exit(da9052); | |
95 | kfree(da9052); | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
100 | static struct i2c_device_id da9052_i2c_id[] = { | |
101 | {"da9052", DA9052}, | |
102 | {"da9053-aa", DA9053_AA}, | |
103 | {"da9053-ba", DA9053_BA}, | |
104 | {"da9053-bb", DA9053_BB}, | |
105 | {} | |
106 | }; | |
107 | ||
108 | static struct i2c_driver da9052_i2c_driver = { | |
109 | .probe = da9052_i2c_probe, | |
110 | .remove = da9052_i2c_remove, | |
111 | .id_table = da9052_i2c_id, | |
112 | .driver = { | |
113 | .name = "da9052", | |
114 | .owner = THIS_MODULE, | |
115 | }, | |
116 | }; | |
117 | ||
118 | static int __init da9052_i2c_init(void) | |
119 | { | |
120 | int ret; | |
121 | ||
122 | ret = i2c_add_driver(&da9052_i2c_driver); | |
123 | if (ret != 0) { | |
124 | pr_err("DA9052 I2C registration failed %d\n", ret); | |
125 | return ret; | |
126 | } | |
127 | ||
128 | return 0; | |
129 | } | |
130 | subsys_initcall(da9052_i2c_init); | |
131 | ||
132 | static void __exit da9052_i2c_exit(void) | |
133 | { | |
134 | i2c_del_driver(&da9052_i2c_driver); | |
135 | } | |
136 | module_exit(da9052_i2c_exit); | |
137 | ||
138 | MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); | |
139 | MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC"); | |
140 | MODULE_LICENSE("GPL"); |