1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * ST Microelectronics MFD: stmpe's i2c client specific driver
4 *
5 * Copyright (C) ST-Ericsson SA 2010
6 * Copyright (C) ST Microelectronics SA 2011
7 *
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
i2c_reg_read(struct stmpe * stmpe,u8 reg)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
i2c_reg_write(struct stmpe * stmpe,u8 reg,u8 val)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
i2c_block_read(struct stmpe * stmpe,u8 reg,u8 length,u8 * values)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
i2c_block_write(struct stmpe * stmpe,u8 reg,u8 length,const u8 * values)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,stmpe1600", .data = (void *)STMPE1600, },
61 { .compatible = "st,stmpe1601", .data = (void *)STMPE1601, },
62 { .compatible = "st,stmpe1801", .data = (void *)STMPE1801, },
63 { .compatible = "st,stmpe2401", .data = (void *)STMPE2401, },
64 { .compatible = "st,stmpe2403", .data = (void *)STMPE2403, },
65 {},
66 };
67 MODULE_DEVICE_TABLE(of, stmpe_of_match);
68
69 static int
stmpe_i2c_probe(struct i2c_client * i2c)70 stmpe_i2c_probe(struct i2c_client *i2c)
71 {
72 const struct i2c_device_id *id = i2c_client_get_device_id(i2c);
73 enum stmpe_partnum partnum;
74 const struct of_device_id *of_id;
75
76 i2c_ci.data = (void *)id;
77 i2c_ci.irq = i2c->irq;
78 i2c_ci.client = i2c;
79 i2c_ci.dev = &i2c->dev;
80
81 of_id = of_match_device(stmpe_of_match, &i2c->dev);
82 if (!of_id) {
83 /*
84 * This happens when the I2C ID matches the node name
85 * but no real compatible string has been given.
86 */
87 dev_info(&i2c->dev, "matching on node name, compatible is preferred\n");
88 partnum = id->driver_data;
89 } else
90 partnum = (uintptr_t)of_id->data;
91
92 return stmpe_probe(&i2c_ci, partnum);
93 }
94
stmpe_i2c_remove(struct i2c_client * i2c)95 static void stmpe_i2c_remove(struct i2c_client *i2c)
96 {
97 struct stmpe *stmpe = dev_get_drvdata(&i2c->dev);
98
99 stmpe_remove(stmpe);
100 }
101
102 static const struct i2c_device_id stmpe_i2c_id[] = {
103 { "stmpe610", STMPE610 },
104 { "stmpe801", STMPE801 },
105 { "stmpe811", STMPE811 },
106 { "stmpe1600", STMPE1600 },
107 { "stmpe1601", STMPE1601 },
108 { "stmpe1801", STMPE1801 },
109 { "stmpe2401", STMPE2401 },
110 { "stmpe2403", STMPE2403 },
111 { }
112 };
113 MODULE_DEVICE_TABLE(i2c, stmpe_i2c_id);
114
115 static struct i2c_driver stmpe_i2c_driver = {
116 .driver = {
117 .name = "stmpe-i2c",
118 .pm = pm_sleep_ptr(&stmpe_dev_pm_ops),
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
stmpe_init(void)126 static int __init stmpe_init(void)
127 {
128 return i2c_add_driver(&stmpe_i2c_driver);
129 }
130 subsys_initcall(stmpe_init);
131
stmpe_exit(void)132 static void __exit stmpe_exit(void)
133 {
134 i2c_del_driver(&stmpe_i2c_driver);
135 }
136 module_exit(stmpe_exit);
137
138 MODULE_DESCRIPTION("STMPE MFD I2C Interface Driver");
139 MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>");
140