From 9664877ed8956b81feb3bd6b3b2621b5fcdb624f Mon Sep 17 00:00:00 2001 From: Ferruh Yigit Date: Sun, 30 Jun 2013 18:46:56 -0700 Subject: Input: cyttsp - I2C driver split into two modules Existing I2C code is for TrueTouch Gen3 devices TrueTouch Gen4 device is using same protocol, will split driver into two pieces to use common code with both drivers. Read/Write functions parameter list modified, since shared code will be used by two separate drivers and these drivers are not sharing same structs, parameters updated to use common structures. Signed-off-by: Ferruh Yigit Acked-by: Greg Kroah-Hartman Acked-by: Javier Martinez Canillas Signed-off-by: Dmitry Torokhov --- drivers/input/touchscreen/cyttsp_i2c_common.c | 79 +++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 drivers/input/touchscreen/cyttsp_i2c_common.c (limited to 'drivers/input/touchscreen/cyttsp_i2c_common.c') diff --git a/drivers/input/touchscreen/cyttsp_i2c_common.c b/drivers/input/touchscreen/cyttsp_i2c_common.c new file mode 100644 index 000000000000..07c553fbcef2 --- /dev/null +++ b/drivers/input/touchscreen/cyttsp_i2c_common.c @@ -0,0 +1,79 @@ +/* + * cyttsp_i2c_common.c + * Cypress TrueTouch(TM) Standard Product (TTSP) I2C touchscreen driver. + * For use with Cypress Txx3xx and Txx4xx parts. + * Supported parts include: + * CY8CTST341 + * CY8CTMA340 + * TMA4XX + * TMA1036 + * + * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc. + * Copyright (C) 2012 Javier Martinez Canillas + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2, and only version 2, as published by the + * Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * Contact Cypress Semiconductor at www.cypress.com + * + */ + +#include +#include +#include +#include +#include + +int cyttsp_i2c_read_block_data(struct device *dev, u8 *xfer_buf, + u8 addr, u8 length, void *values) +{ + struct i2c_client *client = to_i2c_client(dev); + struct i2c_msg msgs[] = { + { + .addr = client->addr, + .flags = 0, + .len = 1, + .buf = &addr, + }, + { + .addr = client->addr, + .flags = I2C_M_RD, + .len = length, + .buf = values, + }, + }; + int retval; + + retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); + if (retval < 0) + return retval; + + return retval != ARRAY_SIZE(msgs) ? -EIO : 0; +} +EXPORT_SYMBOL_GPL(cyttsp_i2c_read_block_data); + +int cyttsp_i2c_write_block_data(struct device *dev, u8 *xfer_buf, + u8 addr, u8 length, const void *values) +{ + struct i2c_client *client = to_i2c_client(dev); + int retval; + + xfer_buf[0] = addr; + memcpy(&xfer_buf[1], values, length); + + retval = i2c_master_send(client, xfer_buf, length + 1); + + return retval < 0 ? retval : 0; +} +EXPORT_SYMBOL_GPL(cyttsp_i2c_write_block_data); + + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Cypress"); -- cgit v1.2.3-59-g8ed1b