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
26 static const struct mfd_cell tps6507x_devs[] = {
27 {
28 .name = "tps6507x-pmic",
29 },
30 {
31 .name = "tps6507x-ts",
32 },
33 };
34
35
tps6507x_i2c_read_device(struct tps6507x_dev * tps6507x,char reg,int bytes,void * dest)36 static 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 = ®
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(i2c->adapter, xfer, 2);
56 if (ret == 2)
57 ret = 0;
58 else if (ret >= 0)
59 ret = -EIO;
60
61 return ret;
62 }
63
tps6507x_i2c_write_device(struct tps6507x_dev * tps6507x,char reg,int bytes,void * src)64 static 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(i2c, msg, bytes + 1);
79 if (ret < 0)
80 return ret;
81 if (ret != bytes + 1)
82 return -EIO;
83 return 0;
84 }
85
tps6507x_i2c_probe(struct i2c_client * i2c)86 static int tps6507x_i2c_probe(struct i2c_client *i2c)
87 {
88 struct tps6507x_dev *tps6507x;
89
90 tps6507x = devm_kzalloc(&i2c->dev, sizeof(struct tps6507x_dev),
91 GFP_KERNEL);
92 if (tps6507x == NULL)
93 return -ENOMEM;
94
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
101 return devm_mfd_add_devices(tps6507x->dev, -1, tps6507x_devs,
102 ARRAY_SIZE(tps6507x_devs), NULL, 0, NULL);
103 }
104
105 static const struct i2c_device_id tps6507x_i2c_id[] = {
106 { "tps6507x" },
107 { }
108 };
109 MODULE_DEVICE_TABLE(i2c, tps6507x_i2c_id);
110
111 #ifdef CONFIG_OF
112 static const struct of_device_id tps6507x_of_match[] = {
113 {.compatible = "ti,tps6507x", },
114 {},
115 };
116 MODULE_DEVICE_TABLE(of, tps6507x_of_match);
117 #endif
118
119 static 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
tps6507x_i2c_init(void)128 static 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 */
133 subsys_initcall(tps6507x_i2c_init);
134
tps6507x_i2c_exit(void)135 static void __exit tps6507x_i2c_exit(void)
136 {
137 i2c_del_driver(&tps6507x_i2c_driver);
138 }
139 module_exit(tps6507x_i2c_exit);
140
141 MODULE_DESCRIPTION("TPS6507x chip family multi-function driver");
142 MODULE_LICENSE("GPL");
143