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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 | ||
84c99db8 AJ |
30 | static 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, ®_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 | ||
58d114b6 YCLP |
49 | static 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 | |
58 | static 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 | ||
84c99db8 AJ |
67 | static 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 = kzalloc(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 | ret = -ENODEV; | |
82 | goto err; | |
83 | } | |
84 | ||
85 | da9052->dev = &client->dev; | |
86 | da9052->chip_irq = client->irq; | |
87 | ||
88 | i2c_set_clientdata(client, da9052); | |
89 | ||
90 | da9052->regmap = regmap_init_i2c(client, &da9052_regmap_config); | |
91 | if (IS_ERR(da9052->regmap)) { | |
92 | ret = PTR_ERR(da9052->regmap); | |
93 | dev_err(&client->dev, "Failed to allocate register map: %d\n", | |
94 | ret); | |
95 | goto err; | |
96 | } | |
97 | ||
98 | ret = da9052_i2c_enable_multiwrite(da9052); | |
99 | if (ret < 0) | |
4d75dd61 | 100 | goto err_regmap; |
84c99db8 | 101 | |
58d114b6 YCLP |
102 | #ifdef CONFIG_OF |
103 | if (!id) { | |
104 | struct device_node *np = client->dev.of_node; | |
105 | const struct of_device_id *deviceid; | |
106 | ||
107 | deviceid = of_match_node(np, dialog_dt_ids); | |
108 | id = (const struct i2c_device_id *)deviceid->data; | |
109 | } | |
110 | #endif | |
111 | ||
112 | if (!id) { | |
113 | ret = -ENODEV; | |
114 | dev_err(&client->dev, "id is null.\n"); | |
115 | goto err_regmap; | |
116 | } | |
117 | ||
84c99db8 AJ |
118 | ret = da9052_device_init(da9052, id->driver_data); |
119 | if (ret != 0) | |
4d75dd61 | 120 | goto err_regmap; |
84c99db8 AJ |
121 | |
122 | return 0; | |
123 | ||
4d75dd61 AL |
124 | err_regmap: |
125 | regmap_exit(da9052->regmap); | |
84c99db8 AJ |
126 | err: |
127 | kfree(da9052); | |
128 | return ret; | |
129 | } | |
130 | ||
bcc2d6d6 | 131 | static int __devexit da9052_i2c_remove(struct i2c_client *client) |
84c99db8 AJ |
132 | { |
133 | struct da9052 *da9052 = i2c_get_clientdata(client); | |
134 | ||
135 | da9052_device_exit(da9052); | |
4d75dd61 | 136 | regmap_exit(da9052->regmap); |
84c99db8 AJ |
137 | kfree(da9052); |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
84c99db8 AJ |
142 | static struct i2c_driver da9052_i2c_driver = { |
143 | .probe = da9052_i2c_probe, | |
bcc2d6d6 | 144 | .remove = __devexit_p(da9052_i2c_remove), |
84c99db8 AJ |
145 | .id_table = da9052_i2c_id, |
146 | .driver = { | |
147 | .name = "da9052", | |
148 | .owner = THIS_MODULE, | |
58d114b6 YCLP |
149 | #ifdef CONFIG_OF |
150 | .of_match_table = dialog_dt_ids, | |
151 | #endif | |
84c99db8 AJ |
152 | }, |
153 | }; | |
154 | ||
155 | static int __init da9052_i2c_init(void) | |
156 | { | |
157 | int ret; | |
158 | ||
159 | ret = i2c_add_driver(&da9052_i2c_driver); | |
160 | if (ret != 0) { | |
161 | pr_err("DA9052 I2C registration failed %d\n", ret); | |
162 | return ret; | |
163 | } | |
164 | ||
165 | return 0; | |
166 | } | |
167 | subsys_initcall(da9052_i2c_init); | |
168 | ||
169 | static void __exit da9052_i2c_exit(void) | |
170 | { | |
171 | i2c_del_driver(&da9052_i2c_driver); | |
172 | } | |
173 | module_exit(da9052_i2c_exit); | |
174 | ||
175 | MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); | |
176 | MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC"); | |
177 | MODULE_LICENSE("GPL"); |