1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * cyttsp_i2c_common.c |
4 | * Cypress TrueTouch(TM) Standard Product (TTSP) I2C touchscreen driver. |
5 | * For use with Cypress Txx3xx and Txx4xx parts. |
6 | * Supported parts include: |
7 | * CY8CTST341 |
8 | * CY8CTMA340 |
9 | * TMA4XX |
10 | * TMA1036 |
11 | * |
12 | * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc. |
13 | * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org> |
14 | * |
15 | * Contact Cypress Semiconductor at www.cypress.com <ttdrivers@cypress.com> |
16 | */ |
17 | |
18 | #include <linux/device.h> |
19 | #include <linux/export.h> |
20 | #include <linux/i2c.h> |
21 | #include <linux/module.h> |
22 | #include <linux/types.h> |
23 | |
24 | #include "cyttsp4_core.h" |
25 | |
26 | int cyttsp_i2c_read_block_data(struct device *dev, u8 *xfer_buf, |
27 | u16 addr, u8 length, void *values) |
28 | { |
29 | struct i2c_client *client = to_i2c_client(dev); |
30 | u8 client_addr = client->addr | ((addr >> 8) & 0x1); |
31 | u8 addr_lo = addr & 0xFF; |
32 | struct i2c_msg msgs[] = { |
33 | { |
34 | .addr = client_addr, |
35 | .flags = 0, |
36 | .len = 1, |
37 | .buf = &addr_lo, |
38 | }, |
39 | { |
40 | .addr = client_addr, |
41 | .flags = I2C_M_RD, |
42 | .len = length, |
43 | .buf = values, |
44 | }, |
45 | }; |
46 | int retval; |
47 | |
48 | retval = i2c_transfer(adap: client->adapter, msgs, ARRAY_SIZE(msgs)); |
49 | if (retval < 0) |
50 | return retval; |
51 | |
52 | return retval != ARRAY_SIZE(msgs) ? -EIO : 0; |
53 | } |
54 | EXPORT_SYMBOL_GPL(cyttsp_i2c_read_block_data); |
55 | |
56 | int cyttsp_i2c_write_block_data(struct device *dev, u8 *xfer_buf, |
57 | u16 addr, u8 length, const void *values) |
58 | { |
59 | struct i2c_client *client = to_i2c_client(dev); |
60 | u8 client_addr = client->addr | ((addr >> 8) & 0x1); |
61 | u8 addr_lo = addr & 0xFF; |
62 | struct i2c_msg msgs[] = { |
63 | { |
64 | .addr = client_addr, |
65 | .flags = 0, |
66 | .len = length + 1, |
67 | .buf = xfer_buf, |
68 | }, |
69 | }; |
70 | int retval; |
71 | |
72 | xfer_buf[0] = addr_lo; |
73 | memcpy(&xfer_buf[1], values, length); |
74 | |
75 | retval = i2c_transfer(adap: client->adapter, msgs, ARRAY_SIZE(msgs)); |
76 | if (retval < 0) |
77 | return retval; |
78 | |
79 | return retval != ARRAY_SIZE(msgs) ? -EIO : 0; |
80 | } |
81 | EXPORT_SYMBOL_GPL(cyttsp_i2c_write_block_data); |
82 | |
83 | |
84 | MODULE_LICENSE("GPL" ); |
85 | MODULE_AUTHOR("Cypress" ); |
86 | |