tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
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/of.h>
23#include <linux/of_device.h>
24#include <linux/mfd/core.h>
25#include <linux/mfd/tps6507x.h>
26
27static const struct mfd_cell tps6507x_devs[] = {
28 {
29 .name = "tps6507x-pmic",
30 },
31 {
32 .name = "tps6507x-ts",
33 },
34};
35
36
37static int tps6507x_i2c_read_device(struct tps6507x_dev *tps6507x, char reg,
38 int bytes, void *dest)
39{
40 struct i2c_client *i2c = tps6507x->i2c_client;
41 struct i2c_msg xfer[2];
42 int ret;
43
44 /* Write register */
45 xfer[0].addr = i2c->addr;
46 xfer[0].flags = 0;
47 xfer[0].len = 1;
48 xfer[0].buf = ®
49
50 /* Read data */
51 xfer[1].addr = i2c->addr;
52 xfer[1].flags = I2C_M_RD;
53 xfer[1].len = bytes;
54 xfer[1].buf = dest;
55
56 ret = i2c_transfer(i2c->adapter, xfer, 2);
57 if (ret == 2)
58 ret = 0;
59 else if (ret >= 0)
60 ret = -EIO;
61
62 return ret;
63}
64
65static int tps6507x_i2c_write_device(struct tps6507x_dev *tps6507x, char reg,
66 int bytes, void *src)
67{
68 struct i2c_client *i2c = tps6507x->i2c_client;
69 /* we add 1 byte for device register */
70 u8 msg[TPS6507X_MAX_REGISTER + 1];
71 int ret;
72
73 if (bytes > TPS6507X_MAX_REGISTER)
74 return -EINVAL;
75
76 msg[0] = reg;
77 memcpy(&msg[1], src, bytes);
78
79 ret = i2c_master_send(i2c, msg, bytes + 1);
80 if (ret < 0)
81 return ret;
82 if (ret != bytes + 1)
83 return -EIO;
84 return 0;
85}
86
87static int tps6507x_i2c_probe(struct i2c_client *i2c)
88{
89 struct tps6507x_dev *tps6507x;
90
91 tps6507x = devm_kzalloc(&i2c->dev, sizeof(struct tps6507x_dev),
92 GFP_KERNEL);
93 if (tps6507x == NULL)
94 return -ENOMEM;
95
96 i2c_set_clientdata(i2c, tps6507x);
97 tps6507x->dev = &i2c->dev;
98 tps6507x->i2c_client = i2c;
99 tps6507x->read_dev = tps6507x_i2c_read_device;
100 tps6507x->write_dev = tps6507x_i2c_write_device;
101
102 return devm_mfd_add_devices(tps6507x->dev, -1, tps6507x_devs,
103 ARRAY_SIZE(tps6507x_devs), NULL, 0, NULL);
104}
105
106static const struct i2c_device_id tps6507x_i2c_id[] = {
107 { "tps6507x", 0 },
108 { }
109};
110MODULE_DEVICE_TABLE(i2c, tps6507x_i2c_id);
111
112#ifdef CONFIG_OF
113static const struct of_device_id tps6507x_of_match[] = {
114 {.compatible = "ti,tps6507x", },
115 {},
116};
117MODULE_DEVICE_TABLE(of, tps6507x_of_match);
118#endif
119
120static struct i2c_driver tps6507x_i2c_driver = {
121 .driver = {
122 .name = "tps6507x",
123 .of_match_table = of_match_ptr(tps6507x_of_match),
124 },
125 .probe_new = tps6507x_i2c_probe,
126 .id_table = tps6507x_i2c_id,
127};
128
129static int __init tps6507x_i2c_init(void)
130{
131 return i2c_add_driver(&tps6507x_i2c_driver);
132}
133/* init early so consumer devices can complete system boot */
134subsys_initcall(tps6507x_i2c_init);
135
136static void __exit tps6507x_i2c_exit(void)
137{
138 i2c_del_driver(&tps6507x_i2c_driver);
139}
140module_exit(tps6507x_i2c_exit);
141
142MODULE_DESCRIPTION("TPS6507x chip family multi-function driver");
143MODULE_LICENSE("GPL");