| Ferruh Yigit | 9664877 | 2013-06-30 18:46:56 -0700 | [diff] [blame^] | 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, |
| 35 | u8 addr, u8 length, void *values) |
| 36 | { |
| 37 | struct i2c_client *client = to_i2c_client(dev); |
| 38 | struct i2c_msg msgs[] = { |
| 39 | { |
| 40 | .addr = client->addr, |
| 41 | .flags = 0, |
| 42 | .len = 1, |
| 43 | .buf = &addr, |
| 44 | }, |
| 45 | { |
| 46 | .addr = client->addr, |
| 47 | .flags = I2C_M_RD, |
| 48 | .len = length, |
| 49 | .buf = values, |
| 50 | }, |
| 51 | }; |
| 52 | int retval; |
| 53 | |
| 54 | retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); |
| 55 | if (retval < 0) |
| 56 | return retval; |
| 57 | |
| 58 | return retval != ARRAY_SIZE(msgs) ? -EIO : 0; |
| 59 | } |
| 60 | EXPORT_SYMBOL_GPL(cyttsp_i2c_read_block_data); |
| 61 | |
| 62 | int cyttsp_i2c_write_block_data(struct device *dev, u8 *xfer_buf, |
| 63 | u8 addr, u8 length, const void *values) |
| 64 | { |
| 65 | struct i2c_client *client = to_i2c_client(dev); |
| 66 | int retval; |
| 67 | |
| 68 | xfer_buf[0] = addr; |
| 69 | memcpy(&xfer_buf[1], values, length); |
| 70 | |
| 71 | retval = i2c_master_send(client, xfer_buf, length + 1); |
| 72 | |
| 73 | return retval < 0 ? retval : 0; |
| 74 | } |
| 75 | EXPORT_SYMBOL_GPL(cyttsp_i2c_write_block_data); |
| 76 | |
| 77 | |
| 78 | MODULE_LICENSE("GPL"); |
| 79 | MODULE_AUTHOR("Cypress"); |