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 #include "cyttsp4_core.h" 35 36 int cyttsp_i2c_read_block_data(struct device *dev, u8 *xfer_buf, 37 u16 addr, u8 length, void *values) 38 { 39 struct i2c_client *client = to_i2c_client(dev); 40 u8 client_addr = client->addr | ((addr >> 8) & 0x1); 41 u8 addr_lo = addr & 0xFF; 42 struct i2c_msg msgs[] = { 43 { 44 .addr = client_addr, 45 .flags = 0, 46 .len = 1, 47 .buf = &addr_lo, 48 }, 49 { 50 .addr = client_addr, 51 .flags = I2C_M_RD, 52 .len = length, 53 .buf = values, 54 }, 55 }; 56 int retval; 57 58 retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 59 if (retval < 0) 60 return retval; 61 62 return retval != ARRAY_SIZE(msgs) ? -EIO : 0; 63 } 64 EXPORT_SYMBOL_GPL(cyttsp_i2c_read_block_data); 65 66 int cyttsp_i2c_write_block_data(struct device *dev, u8 *xfer_buf, 67 u16 addr, u8 length, const void *values) 68 { 69 struct i2c_client *client = to_i2c_client(dev); 70 u8 client_addr = client->addr | ((addr >> 8) & 0x1); 71 u8 addr_lo = addr & 0xFF; 72 struct i2c_msg msgs[] = { 73 { 74 .addr = client_addr, 75 .flags = 0, 76 .len = length + 1, 77 .buf = xfer_buf, 78 }, 79 }; 80 int retval; 81 82 xfer_buf[0] = addr_lo; 83 memcpy(&xfer_buf[1], values, length); 84 85 retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 86 if (retval < 0) 87 return retval; 88 89 return retval != ARRAY_SIZE(msgs) ? -EIO : 0; 90 } 91 EXPORT_SYMBOL_GPL(cyttsp_i2c_write_block_data); 92 93 94 MODULE_LICENSE("GPL"); 95 MODULE_AUTHOR("Cypress"); 96