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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>
Sachin Kamat5c8c8792013-10-16 14:26:53 +053022#include <linux/of.h>
Vishwanathrao Badarkhe, Manish154c4c72013-01-24 16:25:17 +053023#include <linux/of_device.h>
Todd Fischer31dd6a22010-04-08 09:04:55 +020024#include <linux/mfd/core.h>
25#include <linux/mfd/tps6507x.h>
26
Geert Uytterhoeven30fe2b52013-11-18 14:33:02 +010027static const struct mfd_cell tps6507x_devs[] = {
Todd Fischer31dd6a22010-04-08 09:04:55 +020028 {
29 .name = "tps6507x-pmic",
30 },
Todd Fischer75259962010-04-05 17:53:12 -060031 {
32 .name = "tps6507x-ts",
33 },
Todd Fischer31dd6a22010-04-08 09:04:55 +020034};
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 = &reg;
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
Axel Lina8d6aa02010-10-13 10:44:39 +080073 if (bytes > TPS6507X_MAX_REGISTER)
Todd Fischer31dd6a22010-04-08 09:04:55 +020074 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 const struct i2c_device_id *id)
89{
90 struct tps6507x_dev *tps6507x;
Todd Fischer31dd6a22010-04-08 09:04:55 +020091
Axel Lin1881b682012-12-09 20:25:55 +080092 tps6507x = devm_kzalloc(&i2c->dev, sizeof(struct tps6507x_dev),
93 GFP_KERNEL);
Axel Lin04a06422010-08-09 14:49:46 +080094 if (tps6507x == NULL)
Todd Fischer31dd6a22010-04-08 09:04:55 +020095 return -ENOMEM;
Todd Fischer31dd6a22010-04-08 09:04:55 +020096
97 i2c_set_clientdata(i2c, tps6507x);
98 tps6507x->dev = &i2c->dev;
99 tps6507x->i2c_client = i2c;
100 tps6507x->read_dev = tps6507x_i2c_read_device;
101 tps6507x->write_dev = tps6507x_i2c_write_device;
102
Laxman Dewangan5635d992016-04-08 00:13:11 +0530103 return devm_mfd_add_devices(tps6507x->dev, -1, tps6507x_devs,
104 ARRAY_SIZE(tps6507x_devs), NULL, 0, NULL);
Todd Fischer31dd6a22010-04-08 09:04:55 +0200105}
106
107static const struct i2c_device_id tps6507x_i2c_id[] = {
Ben Copeland7657c9f2016-06-09 16:25:50 +0100108 { "tps6507x", 0 },
109 { }
Todd Fischer31dd6a22010-04-08 09:04:55 +0200110};
111MODULE_DEVICE_TABLE(i2c, tps6507x_i2c_id);
112
Vishwanathrao Badarkhe, Manish154c4c72013-01-24 16:25:17 +0530113#ifdef CONFIG_OF
Jingoo Han153a4ff2014-05-07 17:22:28 +0900114static const struct of_device_id tps6507x_of_match[] = {
Vishwanathrao Badarkhe, Manish154c4c72013-01-24 16:25:17 +0530115 {.compatible = "ti,tps6507x", },
116 {},
117};
118MODULE_DEVICE_TABLE(of, tps6507x_of_match);
119#endif
Todd Fischer31dd6a22010-04-08 09:04:55 +0200120
121static struct i2c_driver tps6507x_i2c_driver = {
122 .driver = {
123 .name = "tps6507x",
Vishwanathrao Badarkhe, Manish154c4c72013-01-24 16:25:17 +0530124 .of_match_table = of_match_ptr(tps6507x_of_match),
Todd Fischer31dd6a22010-04-08 09:04:55 +0200125 },
126 .probe = tps6507x_i2c_probe,
Todd Fischer31dd6a22010-04-08 09:04:55 +0200127 .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");