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

source code of linux/drivers/mfd/tps6507x.c