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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 294 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141900.825281744@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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* Contact Cypress Semiconductor at www.cypress.com <ttdrivers@cypress.com>
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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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#include "cyttsp4_core.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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