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 | |
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(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 | |
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(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 | |
86 | static 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 | |
105 | static const struct i2c_device_id tps6507x_i2c_id[] = { |
106 | { "tps6507x" , 0 }, |
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 | |
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 | |
135 | static void __exit tps6507x_i2c_exit(void) |
136 | { |
137 | i2c_del_driver(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 | |