[linux-2.6-block.git] / drivers / input / touchscreen / cyttsp_i2c_common.c

/*
 * 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 <javier@dowhile0.org>
 *
 * 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 <ttdrivers@cypress.com>
 *
 */

#include <linux/device.h>
#include <linux/export.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/types.h>

#include "cyttsp4_core.h"

int cyttsp_i2c_read_block_data(struct device *dev, u8 *xfer_buf,
				      u16 addr, u8 length, void *values)
{
	struct i2c_client *client = to_i2c_client(dev);
	u8 client_addr = client->addr | ((addr >> 8) & 0x1);
	u8 addr_lo = addr & 0xFF;
	struct i2c_msg msgs[] = {
		{
			.addr = client_addr,
			.flags = 0,
			.len = 1,
			.buf = &addr_lo,
		},
		{
			.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,
				       u16 addr, u8 length, const void *values)
{
	struct i2c_client *client = to_i2c_client(dev);
	u8 client_addr = client->addr | ((addr >> 8) & 0x1);
	u8 addr_lo = addr & 0xFF;
	struct i2c_msg msgs[] = {
		{
			.addr = client_addr,
			.flags = 0,
			.len = length + 1,
			.buf = xfer_buf,
		},
	};
	int retval;

	xfer_buf[0] = addr_lo;
	memcpy(&xfer_buf[1], values, length);

	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_write_block_data);


MODULE_LICENSE("GPL");
MODULE_AUTHOR("Cypress");
Commit	Line	Data
9664877e FY	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
9222d806 RK	34	#include "cyttsp4_core.h"
9222d806 RK	35
9664877e	36	int cyttsp_i2c_read_block_data(struct device dev, u8 xfer_buf,
62f548d0	37	u16 addr, u8 length, void *values)
9664877e FY	38	{
9664877e FY	39	struct i2c_client *client = to_i2c_client(dev);
62f548d0 FY	40	u8 client_addr = client->addr \| ((addr >> 8) & 0x1);
62f548d0 FY	41	u8 addr_lo = addr & 0xFF;
9664877e FY	42	struct i2c_msg msgs[] = {
9664877e FY	43	{
62f548d0	44	.addr = client_addr,
9664877e FY	45	.flags = 0,
9664877e FY	46	.len = 1,
62f548d0	47	.buf = &addr_lo,
9664877e FY	48	},
9664877e FY	49	{
62f548d0	50	.addr = client_addr,
9664877e FY	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,
62f548d0	67	u16 addr, u8 length, const void *values)
9664877e FY	68	{
9664877e FY	69	struct i2c_client *client = to_i2c_client(dev);
62f548d0 FY	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	};
9664877e FY	80	int retval;
9664877e FY	81
62f548d0	82	xfer_buf[0] = addr_lo;
9664877e FY	83	memcpy(&xfer_buf[1], values, length);
9664877e FY	84
62f548d0 FY	85	retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
	86	if (retval < 0)
	87	return retval;
9664877e	88
62f548d0	89	return retval != ARRAY_SIZE(msgs) ? -EIO : 0;
9664877e FY	90	}
	91	EXPORT_SYMBOL_GPL(cyttsp_i2c_write_block_data);
	92
	93
	94	MODULE_LICENSE("GPL");
	95	MODULE_AUTHOR("Cypress");