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/mfd/core.h>
23 #include <linux/mfd/tps6507x.h>
24
25 static struct mfd_cell tps6507x_devs[] = {
26 {
27 .name = "tps6507x-pmic",
28 },
29 {
30 .name = "tps6507x-ts",
31 },
32 };
33
34
tps6507x_i2c_read_device(struct tps6507x_dev * tps6507x,char reg,int bytes,void * dest)35 static 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 = ®
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
tps6507x_i2c_write_device(struct tps6507x_dev * tps6507x,char reg,int bytes,void * src)63 static 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
71 if (bytes > TPS6507X_MAX_REGISTER)
72 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
tps6507x_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)85 static int tps6507x_i2c_probe(struct i2c_client *i2c,
86 const struct i2c_device_id *id)
87 {
88 struct tps6507x_dev *tps6507x;
89 int ret = 0;
90
91 tps6507x = kzalloc(sizeof(struct tps6507x_dev), 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 ret = mfd_add_devices(tps6507x->dev, -1,
102 tps6507x_devs, ARRAY_SIZE(tps6507x_devs),
103 NULL, 0);
104
105 if (ret < 0)
106 goto err;
107
108 return ret;
109
110 err:
111 mfd_remove_devices(tps6507x->dev);
112 kfree(tps6507x);
113 return ret;
114 }
115
tps6507x_i2c_remove(struct i2c_client * i2c)116 static int tps6507x_i2c_remove(struct i2c_client *i2c)
117 {
118 struct tps6507x_dev *tps6507x = i2c_get_clientdata(i2c);
119
120 mfd_remove_devices(tps6507x->dev);
121 kfree(tps6507x);
122
123 return 0;
124 }
125
126 static const struct i2c_device_id tps6507x_i2c_id[] = {
127 { "tps6507x", 0 },
128 { }
129 };
130 MODULE_DEVICE_TABLE(i2c, tps6507x_i2c_id);
131
132
133 static struct i2c_driver tps6507x_i2c_driver = {
134 .driver = {
135 .name = "tps6507x",
136 .owner = THIS_MODULE,
137 },
138 .probe = tps6507x_i2c_probe,
139 .remove = tps6507x_i2c_remove,
140 .id_table = tps6507x_i2c_id,
141 };
142
tps6507x_i2c_init(void)143 static int __init tps6507x_i2c_init(void)
144 {
145 return i2c_add_driver(&tps6507x_i2c_driver);
146 }
147 /* init early so consumer devices can complete system boot */
148 subsys_initcall(tps6507x_i2c_init);
149
tps6507x_i2c_exit(void)150 static void __exit tps6507x_i2c_exit(void)
151 {
152 i2c_del_driver(&tps6507x_i2c_driver);
153 }
154 module_exit(tps6507x_i2c_exit);
155
156 MODULE_DESCRIPTION("TPS6507x chip family multi-function driver");
157 MODULE_LICENSE("GPL");
158