GNU Linux-libre 4.4.289-gnu1
[releases.git] / drivers / mfd / stmpe-i2c.c
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 <vireshk@kernel.org> 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
20 static 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
27 static 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
34 static 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
41 static 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
49 static 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
56 static 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 };
66 MODULE_DEVICE_TABLE(of, stmpe_of_match);
67
68 static int
69 stmpe_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
93 static 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
100 static 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 };
110 MODULE_DEVICE_TABLE(i2c, stmpe_i2c_id);
111
112 static struct i2c_driver stmpe_i2c_driver = {
113         .driver = {
114                 .name = "stmpe-i2c",
115 #ifdef CONFIG_PM
116                 .pm = &stmpe_dev_pm_ops,
117 #endif
118                 .of_match_table = stmpe_of_match,
119         },
120         .probe          = stmpe_i2c_probe,
121         .remove         = stmpe_i2c_remove,
122         .id_table       = stmpe_i2c_id,
123 };
124
125 static int __init stmpe_init(void)
126 {
127         return i2c_add_driver(&stmpe_i2c_driver);
128 }
129 subsys_initcall(stmpe_init);
130
131 static void __exit stmpe_exit(void)
132 {
133         i2c_del_driver(&stmpe_i2c_driver);
134 }
135 module_exit(stmpe_exit);
136
137 MODULE_LICENSE("GPL v2");
138 MODULE_DESCRIPTION("STMPE MFD I2C Interface Driver");
139 MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>");