blob: 409afa23d5dc0c2f4bf42278c76d780862c3cec3 [file] [log] [blame]
Todd Fischer31dd6a22010-04-08 09:04:55 +02001/*
2 * tps6507x.c -- TPS6507x chip family multi-function driver
3 *
4 * Copyright (c) 2010 RidgeRun (todd.fischer@ridgerun.com)
5 *
6 * Author: Todd Fischer
7 * todd.fischer@ridgerun.com
8 *
9 * Credits:
10 *
11 * Using code from wm831x-*.c, wm8400-core, Wolfson Microelectronics PLC.
12 *
13 * For licencing details see kernel-base/COPYING
14 *
15 */
16
17#include <linux/module.h>
18#include <linux/moduleparam.h>
19#include <linux/init.h>
20#include <linux/slab.h>
21#include <linux/i2c.h>
22#include <linux/mfd/core.h>
23#include <linux/mfd/tps6507x.h>
24
25static struct mfd_cell tps6507x_devs[] = {
26 {
27 .name = "tps6507x-pmic",
28 },
Todd Fischer75259962010-04-05 17:53:12 -060029 {
30 .name = "tps6507x-ts",
31 },
Todd Fischer31dd6a22010-04-08 09:04:55 +020032};
33
34
35static int tps6507x_i2c_read_device(struct tps6507x_dev *tps6507x, char reg,
36 int bytes, void *dest)
37{
38 struct i2c_client *i2c = tps6507x->i2c_client;
39 struct i2c_msg xfer[2];
40 int ret;
41
42 /* Write register */
43 xfer[0].addr = i2c->addr;
44 xfer[0].flags = 0;
45 xfer[0].len = 1;
46 xfer[0].buf = &reg;
47
48 /* Read data */
49 xfer[1].addr = i2c->addr;
50 xfer[1].flags = I2C_M_RD;
51 xfer[1].len = bytes;
52 xfer[1].buf = dest;
53
54 ret = i2c_transfer(i2c->adapter, xfer, 2);
55 if (ret == 2)
56 ret = 0;
57 else if (ret >= 0)
58 ret = -EIO;
59
60 return ret;
61}
62
63static int tps6507x_i2c_write_device(struct tps6507x_dev *tps6507x, char reg,
64 int bytes, void *src)
65{
66 struct i2c_client *i2c = tps6507x->i2c_client;
67 /* we add 1 byte for device register */
68 u8 msg[TPS6507X_MAX_REGISTER + 1];
69 int ret;
70
Axel Lina8d6aa02010-10-13 10:44:39 +080071 if (bytes > TPS6507X_MAX_REGISTER)
Todd Fischer31dd6a22010-04-08 09:04:55 +020072 return -EINVAL;
73
74 msg[0] = reg;
75 memcpy(&msg[1], src, bytes);
76
77 ret = i2c_master_send(i2c, msg, bytes + 1);
78 if (ret < 0)
79 return ret;
80 if (ret != bytes + 1)
81 return -EIO;
82 return 0;
83}
84
85static int tps6507x_i2c_probe(struct i2c_client *i2c,
86 const struct i2c_device_id *id)
87{
88 struct tps6507x_dev *tps6507x;
Todd Fischer31dd6a22010-04-08 09:04:55 +020089
Axel Lin1881b682012-12-09 20:25:55 +080090 tps6507x = devm_kzalloc(&i2c->dev, sizeof(struct tps6507x_dev),
91 GFP_KERNEL);
Axel Lin04a06422010-08-09 14:49:46 +080092 if (tps6507x == NULL)
Todd Fischer31dd6a22010-04-08 09:04:55 +020093 return -ENOMEM;
Todd Fischer31dd6a22010-04-08 09:04:55 +020094
95 i2c_set_clientdata(i2c, tps6507x);
96 tps6507x->dev = &i2c->dev;
97 tps6507x->i2c_client = i2c;
98 tps6507x->read_dev = tps6507x_i2c_read_device;
99 tps6507x->write_dev = tps6507x_i2c_write_device;
100
Axel Lin1881b682012-12-09 20:25:55 +0800101 return mfd_add_devices(tps6507x->dev, -1, tps6507x_devs,
102 ARRAY_SIZE(tps6507x_devs), NULL, 0, NULL);
Todd Fischer31dd6a22010-04-08 09:04:55 +0200103}
104
105static int tps6507x_i2c_remove(struct i2c_client *i2c)
106{
107 struct tps6507x_dev *tps6507x = i2c_get_clientdata(i2c);
108
109 mfd_remove_devices(tps6507x->dev);
Todd Fischer31dd6a22010-04-08 09:04:55 +0200110 return 0;
111}
112
113static const struct i2c_device_id tps6507x_i2c_id[] = {
114 { "tps6507x", 0 },
115 { }
116};
117MODULE_DEVICE_TABLE(i2c, tps6507x_i2c_id);
118
119
120static struct i2c_driver tps6507x_i2c_driver = {
121 .driver = {
122 .name = "tps6507x",
123 .owner = THIS_MODULE,
124 },
125 .probe = tps6507x_i2c_probe,
126 .remove = tps6507x_i2c_remove,
127 .id_table = tps6507x_i2c_id,
128};
129
130static int __init tps6507x_i2c_init(void)
131{
132 return i2c_add_driver(&tps6507x_i2c_driver);
133}
134/* init early so consumer devices can complete system boot */
135subsys_initcall(tps6507x_i2c_init);
136
137static void __exit tps6507x_i2c_exit(void)
138{
139 i2c_del_driver(&tps6507x_i2c_driver);
140}
141module_exit(tps6507x_i2c_exit);
142
143MODULE_DESCRIPTION("TPS6507x chip family multi-function driver");
144MODULE_LICENSE("GPL");