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36e52873 MO |
1 | /* |
2 | * tps65912-i2c.c -- I2C access for TI TPS65912x PMIC | |
3 | * | |
4 | * Copyright 2011 Texas Instruments Inc. | |
5 | * | |
6 | * Author: Margarita Olaya Cabrera <magi@slimlogic.co.uk> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2 of the License, or (at your | |
11 | * option) any later version. | |
12 | * | |
13 | * This driver is based on wm8350 implementation. | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/moduleparam.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/gpio.h> | |
21 | #include <linux/i2c.h> | |
22 | #include <linux/mfd/core.h> | |
23 | #include <linux/mfd/tps65912.h> | |
24 | ||
25 | static int tps65912_i2c_read(struct tps65912 *tps65912, u8 reg, | |
26 | int bytes, void *dest) | |
27 | { | |
28 | struct i2c_client *i2c = tps65912->control_data; | |
29 | struct i2c_msg xfer[2]; | |
30 | int ret; | |
31 | ||
32 | /* Write register */ | |
33 | xfer[0].addr = i2c->addr; | |
34 | xfer[0].flags = 0; | |
35 | xfer[0].len = 1; | |
36 | xfer[0].buf = ® | |
37 | ||
38 | /* Read data */ | |
39 | xfer[1].addr = i2c->addr; | |
40 | xfer[1].flags = I2C_M_RD; | |
41 | xfer[1].len = bytes; | |
42 | xfer[1].buf = dest; | |
43 | ||
44 | ret = i2c_transfer(i2c->adapter, xfer, 2); | |
45 | if (ret == 2) | |
46 | ret = 0; | |
47 | else if (ret >= 0) | |
48 | ret = -EIO; | |
49 | return ret; | |
50 | } | |
51 | ||
52 | static int tps65912_i2c_write(struct tps65912 *tps65912, u8 reg, | |
53 | int bytes, void *src) | |
54 | { | |
55 | struct i2c_client *i2c = tps65912->control_data; | |
56 | /* we add 1 byte for device register */ | |
57 | u8 msg[TPS6591X_MAX_REGISTER + 1]; | |
58 | int ret; | |
59 | ||
63c8a58d | 60 | if (bytes > TPS6591X_MAX_REGISTER) |
36e52873 MO |
61 | return -EINVAL; |
62 | ||
63 | msg[0] = reg; | |
64 | memcpy(&msg[1], src, bytes); | |
65 | ||
66 | ret = i2c_master_send(i2c, msg, bytes + 1); | |
67 | if (ret < 0) | |
68 | return ret; | |
69 | if (ret != bytes + 1) | |
70 | return -EIO; | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
75 | static int tps65912_i2c_probe(struct i2c_client *i2c, | |
76 | const struct i2c_device_id *id) | |
77 | { | |
78 | struct tps65912 *tps65912; | |
79 | ||
80 | tps65912 = kzalloc(sizeof(struct tps65912), GFP_KERNEL); | |
81 | if (tps65912 == NULL) | |
82 | return -ENOMEM; | |
83 | ||
84 | i2c_set_clientdata(i2c, tps65912); | |
85 | tps65912->dev = &i2c->dev; | |
86 | tps65912->control_data = i2c; | |
87 | tps65912->read = tps65912_i2c_read; | |
88 | tps65912->write = tps65912_i2c_write; | |
89 | ||
90 | return tps65912_device_init(tps65912); | |
91 | } | |
92 | ||
93 | static int tps65912_i2c_remove(struct i2c_client *i2c) | |
94 | { | |
95 | struct tps65912 *tps65912 = i2c_get_clientdata(i2c); | |
96 | ||
97 | tps65912_device_exit(tps65912); | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
102 | static const struct i2c_device_id tps65912_i2c_id[] = { | |
103 | {"tps65912", 0 }, | |
104 | { } | |
105 | }; | |
106 | MODULE_DEVICE_TABLE(i2c, tps65912_i2c_id); | |
107 | ||
108 | static struct i2c_driver tps65912_i2c_driver = { | |
109 | .driver = { | |
110 | .name = "tps65912", | |
111 | .owner = THIS_MODULE, | |
112 | }, | |
113 | .probe = tps65912_i2c_probe, | |
114 | .remove = tps65912_i2c_remove, | |
115 | .id_table = tps65912_i2c_id, | |
116 | }; | |
117 | ||
118 | static int __init tps65912_i2c_init(void) | |
119 | { | |
120 | int ret; | |
121 | ||
122 | ret = i2c_add_driver(&tps65912_i2c_driver); | |
123 | if (ret != 0) | |
124 | pr_err("Failed to register TPS65912 I2C driver: %d\n", ret); | |
125 | ||
126 | return ret; | |
127 | } | |
128 | /* init early so consumer devices can complete system boot */ | |
129 | subsys_initcall(tps65912_i2c_init); | |
130 | ||
131 | static void __exit tps65912_i2c_exit(void) | |
132 | { | |
133 | i2c_del_driver(&tps65912_i2c_driver); | |
134 | } | |
135 | module_exit(tps65912_i2c_exit); | |
136 | ||
137 | MODULE_AUTHOR("Margarita Olaya <magi@slimlogic.co.uk>"); | |
138 | MODULE_DESCRIPTION("TPS6591x chip family multi-function driver"); | |
139 | MODULE_LICENSE("GPL"); |