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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 | ||
31 | ||
32 | static int tps6507x_i2c_read_device(struct tps6507x_dev *tps6507x, char reg, | |
33 | int bytes, void *dest) | |
34 | { | |
35 | struct i2c_client *i2c = tps6507x->i2c_client; | |
36 | struct i2c_msg xfer[2]; | |
37 | int ret; | |
38 | ||
39 | /* Write register */ | |
40 | xfer[0].addr = i2c->addr; | |
41 | xfer[0].flags = 0; | |
42 | xfer[0].len = 1; | |
43 | xfer[0].buf = ® | |
44 | ||
45 | /* Read data */ | |
46 | xfer[1].addr = i2c->addr; | |
47 | xfer[1].flags = I2C_M_RD; | |
48 | xfer[1].len = bytes; | |
49 | xfer[1].buf = dest; | |
50 | ||
51 | ret = i2c_transfer(i2c->adapter, xfer, 2); | |
52 | if (ret == 2) | |
53 | ret = 0; | |
54 | else if (ret >= 0) | |
55 | ret = -EIO; | |
56 | ||
57 | return ret; | |
58 | } | |
59 | ||
60 | static int tps6507x_i2c_write_device(struct tps6507x_dev *tps6507x, char reg, | |
61 | int bytes, void *src) | |
62 | { | |
63 | struct i2c_client *i2c = tps6507x->i2c_client; | |
64 | /* we add 1 byte for device register */ | |
65 | u8 msg[TPS6507X_MAX_REGISTER + 1]; | |
66 | int ret; | |
67 | ||
68 | if (bytes > (TPS6507X_MAX_REGISTER + 1)) | |
69 | return -EINVAL; | |
70 | ||
71 | msg[0] = reg; | |
72 | memcpy(&msg[1], src, bytes); | |
73 | ||
74 | ret = i2c_master_send(i2c, msg, bytes + 1); | |
75 | if (ret < 0) | |
76 | return ret; | |
77 | if (ret != bytes + 1) | |
78 | return -EIO; | |
79 | return 0; | |
80 | } | |
81 | ||
82 | static int tps6507x_i2c_probe(struct i2c_client *i2c, | |
83 | const struct i2c_device_id *id) | |
84 | { | |
85 | struct tps6507x_dev *tps6507x; | |
86 | int ret = 0; | |
87 | ||
88 | tps6507x = kzalloc(sizeof(struct tps6507x_dev), GFP_KERNEL); | |
89 | if (tps6507x == NULL) { | |
90 | kfree(i2c); | |
91 | return -ENOMEM; | |
92 | } | |
93 | ||
94 | i2c_set_clientdata(i2c, tps6507x); | |
95 | tps6507x->dev = &i2c->dev; | |
96 | tps6507x->i2c_client = i2c; | |
97 | tps6507x->read_dev = tps6507x_i2c_read_device; | |
98 | tps6507x->write_dev = tps6507x_i2c_write_device; | |
99 | ||
100 | ret = mfd_add_devices(tps6507x->dev, -1, | |
101 | tps6507x_devs, ARRAY_SIZE(tps6507x_devs), | |
102 | NULL, 0); | |
103 | ||
104 | if (ret < 0) | |
105 | goto err; | |
106 | ||
107 | return ret; | |
108 | ||
109 | err: | |
110 | mfd_remove_devices(tps6507x->dev); | |
111 | kfree(tps6507x); | |
112 | return ret; | |
113 | } | |
114 | ||
115 | static int tps6507x_i2c_remove(struct i2c_client *i2c) | |
116 | { | |
117 | struct tps6507x_dev *tps6507x = i2c_get_clientdata(i2c); | |
118 | ||
119 | mfd_remove_devices(tps6507x->dev); | |
120 | kfree(tps6507x); | |
121 | ||
122 | return 0; | |
123 | } | |
124 | ||
125 | static const struct i2c_device_id tps6507x_i2c_id[] = { | |
126 | { "tps6507x", 0 }, | |
127 | { } | |
128 | }; | |
129 | MODULE_DEVICE_TABLE(i2c, tps6507x_i2c_id); | |
130 | ||
131 | ||
132 | static struct i2c_driver tps6507x_i2c_driver = { | |
133 | .driver = { | |
134 | .name = "tps6507x", | |
135 | .owner = THIS_MODULE, | |
136 | }, | |
137 | .probe = tps6507x_i2c_probe, | |
138 | .remove = tps6507x_i2c_remove, | |
139 | .id_table = tps6507x_i2c_id, | |
140 | }; | |
141 | ||
142 | static int __init tps6507x_i2c_init(void) | |
143 | { | |
144 | return i2c_add_driver(&tps6507x_i2c_driver); | |
145 | } | |
146 | /* init early so consumer devices can complete system boot */ | |
147 | subsys_initcall(tps6507x_i2c_init); | |
148 | ||
149 | static void __exit tps6507x_i2c_exit(void) | |
150 | { | |
151 | i2c_del_driver(&tps6507x_i2c_driver); | |
152 | } | |
153 | module_exit(tps6507x_i2c_exit); | |
154 | ||
155 | MODULE_DESCRIPTION("TPS6507x chip family multi-function driver"); | |
156 | MODULE_LICENSE("GPL"); |