94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
/*
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* cyttsp_i2c_common.c
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* Cypress TrueTouch(TM) Standard Product (TTSP) I2C touchscreen driver.
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* For use with Cypress Txx3xx and Txx4xx parts.
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* Supported parts include:
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* CY8CTST341
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* CY8CTMA340
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* TMA4XX
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* TMA1036
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*
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* Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc.
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* Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2, and only version 2, as published by the
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* Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Contact Cypress Semiconductor at www.cypress.com <ttdrivers@cypress.com>
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*
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*/
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#include <linux/device.h>
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#include <linux/export.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/types.h>
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int cyttsp_i2c_read_block_data(struct device *dev, u8 *xfer_buf,
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u16 addr, u8 length, void *values)
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{
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struct i2c_client *client = to_i2c_client(dev);
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u8 client_addr = client->addr | ((addr >> 8) & 0x1);
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u8 addr_lo = addr & 0xFF;
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struct i2c_msg msgs[] = {
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{
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.addr = client_addr,
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.flags = 0,
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.len = 1,
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.buf = &addr_lo,
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},
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{
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.addr = client_addr,
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.flags = I2C_M_RD,
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.len = length,
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.buf = values,
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},
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};
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int retval;
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retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
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if (retval < 0)
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return retval;
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return retval != ARRAY_SIZE(msgs) ? -EIO : 0;
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}
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EXPORT_SYMBOL_GPL(cyttsp_i2c_read_block_data);
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int cyttsp_i2c_write_block_data(struct device *dev, u8 *xfer_buf,
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u16 addr, u8 length, const void *values)
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{
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struct i2c_client *client = to_i2c_client(dev);
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u8 client_addr = client->addr | ((addr >> 8) & 0x1);
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u8 addr_lo = addr & 0xFF;
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struct i2c_msg msgs[] = {
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{
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.addr = client_addr,
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.flags = 0,
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.len = length + 1,
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.buf = xfer_buf,
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},
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};
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int retval;
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xfer_buf[0] = addr_lo;
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memcpy(&xfer_buf[1], values, length);
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retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
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if (retval < 0)
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return retval;
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return retval != ARRAY_SIZE(msgs) ? -EIO : 0;
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}
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EXPORT_SYMBOL_GPL(cyttsp_i2c_write_block_data);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Cypress");
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