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1 | /* |
2 | * Source for: | |
3 | * Cypress TrueTouch(TM) Standard Product (TTSP) I2C touchscreen driver. | |
4 | * For use with Cypress Txx3xx parts. | |
5 | * Supported parts include: | |
6 | * CY8CTST341 | |
7 | * CY8CTMA340 | |
8 | * | |
9 | * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc. | |
10 | * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU General Public License | |
14 | * version 2, and only version 2, as published by the | |
15 | * Free Software Foundation. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License along | |
23 | * with this program; if not, write to the Free Software Foundation, Inc., | |
24 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
25 | * | |
26 | * Contact Cypress Semiconductor at www.cypress.com <kev@cypress.com> | |
27 | * | |
28 | */ | |
29 | ||
30 | #include "cyttsp_core.h" | |
31 | ||
32 | #include <linux/i2c.h> | |
33 | #include <linux/input.h> | |
34 | ||
35 | #define CY_I2C_DATA_SIZE 128 | |
36 | ||
37 | static int cyttsp_i2c_read_block_data(struct cyttsp *ts, | |
38 | u8 addr, u8 length, void *values) | |
39 | { | |
40 | struct i2c_client *client = to_i2c_client(ts->dev); | |
41 | struct i2c_msg msgs[] = { | |
42 | { | |
43 | .addr = client->addr, | |
44 | .flags = 0, | |
45 | .len = 1, | |
46 | .buf = &addr, | |
47 | }, | |
48 | { | |
49 | .addr = client->addr, | |
50 | .flags = I2C_M_RD, | |
51 | .len = length, | |
52 | .buf = values, | |
53 | }, | |
54 | }; | |
55 | int retval; | |
56 | ||
57 | retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); | |
58 | if (retval < 0) | |
59 | return retval; | |
60 | ||
61 | return retval != ARRAY_SIZE(msgs) ? -EIO : 0; | |
62 | } | |
63 | ||
64 | static int cyttsp_i2c_write_block_data(struct cyttsp *ts, | |
65 | u8 addr, u8 length, const void *values) | |
66 | { | |
67 | struct i2c_client *client = to_i2c_client(ts->dev); | |
68 | int retval; | |
69 | ||
70 | ts->xfer_buf[0] = addr; | |
71 | memcpy(&ts->xfer_buf[1], values, length); | |
72 | ||
73 | retval = i2c_master_send(client, ts->xfer_buf, length + 1); | |
74 | ||
75 | return retval < 0 ? retval : 0; | |
76 | } | |
77 | ||
78 | static const struct cyttsp_bus_ops cyttsp_i2c_bus_ops = { | |
79 | .bustype = BUS_I2C, | |
80 | .write = cyttsp_i2c_write_block_data, | |
81 | .read = cyttsp_i2c_read_block_data, | |
82 | }; | |
83 | ||
84 | static int __devinit cyttsp_i2c_probe(struct i2c_client *client, | |
85 | const struct i2c_device_id *id) | |
86 | { | |
87 | struct cyttsp *ts; | |
88 | ||
89 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { | |
90 | dev_err(&client->dev, "I2C functionality not Supported\n"); | |
91 | return -EIO; | |
92 | } | |
93 | ||
94 | ts = cyttsp_probe(&cyttsp_i2c_bus_ops, &client->dev, client->irq, | |
95 | CY_I2C_DATA_SIZE); | |
96 | ||
97 | if (IS_ERR(ts)) | |
98 | return PTR_ERR(ts); | |
99 | ||
100 | i2c_set_clientdata(client, ts); | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
105 | static int __devexit cyttsp_i2c_remove(struct i2c_client *client) | |
106 | { | |
107 | struct cyttsp *ts = i2c_get_clientdata(client); | |
108 | ||
109 | cyttsp_remove(ts); | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
114 | static const struct i2c_device_id cyttsp_i2c_id[] = { | |
115 | { CY_I2C_NAME, 0 }, | |
116 | { } | |
117 | }; | |
118 | MODULE_DEVICE_TABLE(i2c, cyttsp_i2c_id); | |
119 | ||
120 | static struct i2c_driver cyttsp_i2c_driver = { | |
121 | .driver = { | |
122 | .name = CY_I2C_NAME, | |
123 | .owner = THIS_MODULE, | |
124 | .pm = &cyttsp_pm_ops, | |
125 | }, | |
126 | .probe = cyttsp_i2c_probe, | |
1cb0aa88 | 127 | .remove = cyttsp_i2c_remove, |
4065d1e7 JMC |
128 | .id_table = cyttsp_i2c_id, |
129 | }; | |
130 | ||
4a533835 | 131 | module_i2c_driver(cyttsp_i2c_driver); |
4065d1e7 JMC |
132 | |
133 | MODULE_LICENSE("GPL"); | |
134 | MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard Product (TTSP) I2C driver"); | |
135 | MODULE_AUTHOR("Cypress"); | |
136 | MODULE_ALIAS("i2c:cyttsp"); |