[go: nahoru, domu]
1/*
2 * ST Microelectronics MFD: stmpe's i2c client specific driver
3 *
4 * Copyright (C) ST-Ericsson SA 2010
5 * Copyright (C) ST Microelectronics SA 2011
6 *
7 * License Terms: GNU General Public License, version 2
8 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
9 * Author: Viresh Kumar <viresh.linux@gmail.com> for ST Microelectronics
10 */
11
12#include <linux/i2c.h>
13#include <linux/interrupt.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/types.h>
17#include <linux/of_device.h>
18#include "stmpe.h"
19
20static int i2c_reg_read(struct stmpe *stmpe, u8 reg)
21{
22	struct i2c_client *i2c = stmpe->client;
23
24	return i2c_smbus_read_byte_data(i2c, reg);
25}
26
27static int i2c_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
28{
29	struct i2c_client *i2c = stmpe->client;
30
31	return i2c_smbus_write_byte_data(i2c, reg, val);
32}
33
34static int i2c_block_read(struct stmpe *stmpe, u8 reg, u8 length, u8 *values)
35{
36	struct i2c_client *i2c = stmpe->client;
37
38	return i2c_smbus_read_i2c_block_data(i2c, reg, length, values);
39}
40
41static int i2c_block_write(struct stmpe *stmpe, u8 reg, u8 length,
42		const u8 *values)
43{
44	struct i2c_client *i2c = stmpe->client;
45
46	return i2c_smbus_write_i2c_block_data(i2c, reg, length, values);
47}
48
49static struct stmpe_client_info i2c_ci = {
50	.read_byte = i2c_reg_read,
51	.write_byte = i2c_reg_write,
52	.read_block = i2c_block_read,
53	.write_block = i2c_block_write,
54};
55
56static const struct of_device_id stmpe_of_match[] = {
57	{ .compatible = "st,stmpe610", .data = (void *)STMPE610, },
58	{ .compatible = "st,stmpe801", .data = (void *)STMPE801, },
59	{ .compatible = "st,stmpe811", .data = (void *)STMPE811, },
60	{ .compatible = "st,stmpe1601", .data = (void *)STMPE1601, },
61	{ .compatible = "st,stmpe1801", .data = (void *)STMPE1801, },
62	{ .compatible = "st,stmpe2401", .data = (void *)STMPE2401, },
63	{ .compatible = "st,stmpe2403", .data = (void *)STMPE2403, },
64	{},
65};
66MODULE_DEVICE_TABLE(of, stmpe_of_match);
67
68static int
69stmpe_i2c_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
70{
71	enum stmpe_partnum partnum;
72	const struct of_device_id *of_id;
73
74	i2c_ci.data = (void *)id;
75	i2c_ci.irq = i2c->irq;
76	i2c_ci.client = i2c;
77	i2c_ci.dev = &i2c->dev;
78
79	of_id = of_match_device(stmpe_of_match, &i2c->dev);
80	if (!of_id) {
81		/*
82		 * This happens when the I2C ID matches the node name
83		 * but no real compatible string has been given.
84		 */
85		dev_info(&i2c->dev, "matching on node name, compatible is preferred\n");
86		partnum = id->driver_data;
87	} else
88		partnum = (enum stmpe_partnum)of_id->data;
89
90	return stmpe_probe(&i2c_ci, partnum);
91}
92
93static int stmpe_i2c_remove(struct i2c_client *i2c)
94{
95	struct stmpe *stmpe = dev_get_drvdata(&i2c->dev);
96
97	return stmpe_remove(stmpe);
98}
99
100static const struct i2c_device_id stmpe_i2c_id[] = {
101	{ "stmpe610", STMPE610 },
102	{ "stmpe801", STMPE801 },
103	{ "stmpe811", STMPE811 },
104	{ "stmpe1601", STMPE1601 },
105	{ "stmpe1801", STMPE1801 },
106	{ "stmpe2401", STMPE2401 },
107	{ "stmpe2403", STMPE2403 },
108	{ }
109};
110MODULE_DEVICE_TABLE(i2c, stmpe_id);
111
112static struct i2c_driver stmpe_i2c_driver = {
113	.driver = {
114		.name = "stmpe-i2c",
115		.owner = THIS_MODULE,
116#ifdef CONFIG_PM
117		.pm = &stmpe_dev_pm_ops,
118#endif
119		.of_match_table = stmpe_of_match,
120	},
121	.probe		= stmpe_i2c_probe,
122	.remove		= stmpe_i2c_remove,
123	.id_table	= stmpe_i2c_id,
124};
125
126static int __init stmpe_init(void)
127{
128	return i2c_add_driver(&stmpe_i2c_driver);
129}
130subsys_initcall(stmpe_init);
131
132static void __exit stmpe_exit(void)
133{
134	i2c_del_driver(&stmpe_i2c_driver);
135}
136module_exit(stmpe_exit);
137
138MODULE_LICENSE("GPL v2");
139MODULE_DESCRIPTION("STMPE MFD I2C Interface Driver");
140MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>");
141