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9664877e FY |
1 | /* |
2 | * cyttsp_i2c_common.c | |
3 | * Cypress TrueTouch(TM) Standard Product (TTSP) I2C touchscreen driver. | |
4 | * For use with Cypress Txx3xx and Txx4xx parts. | |
5 | * Supported parts include: | |
6 | * CY8CTST341 | |
7 | * CY8CTMA340 | |
8 | * TMA4XX | |
9 | * TMA1036 | |
10 | * | |
11 | * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc. | |
12 | * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org> | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * version 2, and only version 2, as published by the | |
17 | * Free Software Foundation. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU General Public License for more details. | |
23 | * | |
24 | * Contact Cypress Semiconductor at www.cypress.com <ttdrivers@cypress.com> | |
25 | * | |
26 | */ | |
27 | ||
28 | #include <linux/device.h> | |
29 | #include <linux/export.h> | |
30 | #include <linux/i2c.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/types.h> | |
33 | ||
34 | int cyttsp_i2c_read_block_data(struct device *dev, u8 *xfer_buf, | |
62f548d0 | 35 | u16 addr, u8 length, void *values) |
9664877e FY |
36 | { |
37 | struct i2c_client *client = to_i2c_client(dev); | |
62f548d0 FY |
38 | u8 client_addr = client->addr | ((addr >> 8) & 0x1); |
39 | u8 addr_lo = addr & 0xFF; | |
9664877e FY |
40 | struct i2c_msg msgs[] = { |
41 | { | |
62f548d0 | 42 | .addr = client_addr, |
9664877e FY |
43 | .flags = 0, |
44 | .len = 1, | |
62f548d0 | 45 | .buf = &addr_lo, |
9664877e FY |
46 | }, |
47 | { | |
62f548d0 | 48 | .addr = client_addr, |
9664877e FY |
49 | .flags = I2C_M_RD, |
50 | .len = length, | |
51 | .buf = values, | |
52 | }, | |
53 | }; | |
54 | int retval; | |
55 | ||
56 | retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); | |
57 | if (retval < 0) | |
58 | return retval; | |
59 | ||
60 | return retval != ARRAY_SIZE(msgs) ? -EIO : 0; | |
61 | } | |
62 | EXPORT_SYMBOL_GPL(cyttsp_i2c_read_block_data); | |
63 | ||
64 | int cyttsp_i2c_write_block_data(struct device *dev, u8 *xfer_buf, | |
62f548d0 | 65 | u16 addr, u8 length, const void *values) |
9664877e FY |
66 | { |
67 | struct i2c_client *client = to_i2c_client(dev); | |
62f548d0 FY |
68 | u8 client_addr = client->addr | ((addr >> 8) & 0x1); |
69 | u8 addr_lo = addr & 0xFF; | |
70 | struct i2c_msg msgs[] = { | |
71 | { | |
72 | .addr = client_addr, | |
73 | .flags = 0, | |
74 | .len = length + 1, | |
75 | .buf = xfer_buf, | |
76 | }, | |
77 | }; | |
9664877e FY |
78 | int retval; |
79 | ||
62f548d0 | 80 | xfer_buf[0] = addr_lo; |
9664877e FY |
81 | memcpy(&xfer_buf[1], values, length); |
82 | ||
62f548d0 FY |
83 | retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); |
84 | if (retval < 0) | |
85 | return retval; | |
9664877e | 86 | |
62f548d0 | 87 | return retval != ARRAY_SIZE(msgs) ? -EIO : 0; |
9664877e FY |
88 | } |
89 | EXPORT_SYMBOL_GPL(cyttsp_i2c_write_block_data); | |
90 | ||
91 | ||
92 | MODULE_LICENSE("GPL"); | |
93 | MODULE_AUTHOR("Cypress"); |