1 /*
2  * STMicroelectronics st_lsm6dsx i2c driver
3  *
4  * Copyright 2016 STMicroelectronics Inc.
5  *
6  * Lorenzo Bianconi <lorenzo.bianconi@st.com>
7  * Denis Ciocca <denis.ciocca@st.com>
8  *
9  * Licensed under the GPL-2.
10  */
11 
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/i2c.h>
15 #include <linux/slab.h>
16 #include <linux/of.h>
17 
18 #include "st_lsm6dsx.h"
19 
20 static int st_lsm6dsx_i2c_read(struct device *dev, u8 addr, int len, u8 *data)
21 {
22 	struct i2c_client *client = to_i2c_client(dev);
23 	struct i2c_msg msg[2];
24 
25 	msg[0].addr = client->addr;
26 	msg[0].flags = client->flags;
27 	msg[0].len = 1;
28 	msg[0].buf = &addr;
29 
30 	msg[1].addr = client->addr;
31 	msg[1].flags = client->flags | I2C_M_RD;
32 	msg[1].len = len;
33 	msg[1].buf = data;
34 
35 	return i2c_transfer(client->adapter, msg, 2);
36 }
37 
38 static int st_lsm6dsx_i2c_write(struct device *dev, u8 addr, int len, u8 *data)
39 {
40 	struct i2c_client *client = to_i2c_client(dev);
41 	struct i2c_msg msg;
42 	u8 send[len + 1];
43 
44 	send[0] = addr;
45 	memcpy(&send[1], data, len * sizeof(u8));
46 
47 	msg.addr = client->addr;
48 	msg.flags = client->flags;
49 	msg.len = len + 1;
50 	msg.buf = send;
51 
52 	return i2c_transfer(client->adapter, &msg, 1);
53 }
54 
55 static const struct st_lsm6dsx_transfer_function st_lsm6dsx_transfer_fn = {
56 	.read = st_lsm6dsx_i2c_read,
57 	.write = st_lsm6dsx_i2c_write,
58 };
59 
60 static int st_lsm6dsx_i2c_probe(struct i2c_client *client,
61 				const struct i2c_device_id *id)
62 {
63 	return st_lsm6dsx_probe(&client->dev, client->irq,
64 				(int)id->driver_data, id->name,
65 				&st_lsm6dsx_transfer_fn);
66 }
67 
68 static const struct of_device_id st_lsm6dsx_i2c_of_match[] = {
69 	{
70 		.compatible = "st,lsm6ds3",
71 		.data = (void *)ST_LSM6DS3_ID,
72 	},
73 	{
74 		.compatible = "st,lsm6ds3h",
75 		.data = (void *)ST_LSM6DS3H_ID,
76 	},
77 	{
78 		.compatible = "st,lsm6dsl",
79 		.data = (void *)ST_LSM6DSL_ID,
80 	},
81 	{
82 		.compatible = "st,lsm6dsm",
83 		.data = (void *)ST_LSM6DSM_ID,
84 	},
85 	{},
86 };
87 MODULE_DEVICE_TABLE(of, st_lsm6dsx_i2c_of_match);
88 
89 static const struct i2c_device_id st_lsm6dsx_i2c_id_table[] = {
90 	{ ST_LSM6DS3_DEV_NAME, ST_LSM6DS3_ID },
91 	{ ST_LSM6DS3H_DEV_NAME, ST_LSM6DS3H_ID },
92 	{ ST_LSM6DSL_DEV_NAME, ST_LSM6DSL_ID },
93 	{ ST_LSM6DSM_DEV_NAME, ST_LSM6DSM_ID },
94 	{},
95 };
96 MODULE_DEVICE_TABLE(i2c, st_lsm6dsx_i2c_id_table);
97 
98 static struct i2c_driver st_lsm6dsx_driver = {
99 	.driver = {
100 		.name = "st_lsm6dsx_i2c",
101 		.pm = &st_lsm6dsx_pm_ops,
102 		.of_match_table = of_match_ptr(st_lsm6dsx_i2c_of_match),
103 	},
104 	.probe = st_lsm6dsx_i2c_probe,
105 	.id_table = st_lsm6dsx_i2c_id_table,
106 };
107 module_i2c_driver(st_lsm6dsx_driver);
108 
109 MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@st.com>");
110 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
111 MODULE_DESCRIPTION("STMicroelectronics st_lsm6dsx i2c driver");
112 MODULE_LICENSE("GPL v2");
113