[linux.git] / drivers / input / touchscreen / cyttsp_i2c_common.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * 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 <[email protected]>
 *
 * Contact Cypress Semiconductor at www.cypress.com <[email protected]>
 */

#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_DESCRIPTION("Cypress TrueTouch(TM) Standard Product (TTSP) I2C touchscreen driver");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Cypress");
Commit	Line	Data
97fb5e8d	1	// SPDX-License-Identifier: GPL-2.0-only
9664877e FY	2	/*
	3	* cyttsp_i2c_common.c
	4	* Cypress TrueTouch(TM) Standard Product (TTSP) I2C touchscreen driver.
	5	* For use with Cypress Txx3xx and Txx4xx parts.
	6	* Supported parts include:
	7	* CY8CTST341
	8	* CY8CTMA340
	9	* TMA4XX
	10	* TMA1036
	11	*
	12	* Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc.
	13	* Copyright (C) 2012 Javier Martinez Canillas <[email protected]>
	14	*
9664877e	15	* Contact Cypress Semiconductor at www.cypress.com <[email protected]>
9664877e FY	16	*/
	17
	18	#include <linux/device.h>
	19	#include <linux/export.h>
	20	#include <linux/i2c.h>
	21	#include <linux/module.h>
	22	#include <linux/types.h>
	23
9222d806 RK	24	#include "cyttsp4_core.h"
9222d806 RK	25
9664877e	26	int cyttsp_i2c_read_block_data(struct device dev, u8 xfer_buf,
62f548d0	27	u16 addr, u8 length, void *values)
9664877e FY	28	{
9664877e FY	29	struct i2c_client *client = to_i2c_client(dev);
62f548d0 FY	30	u8 client_addr = client->addr \| ((addr >> 8) & 0x1);
62f548d0 FY	31	u8 addr_lo = addr & 0xFF;
9664877e FY	32	struct i2c_msg msgs[] = {
9664877e FY	33	{
62f548d0	34	.addr = client_addr,
9664877e FY	35	.flags = 0,
9664877e FY	36	.len = 1,
62f548d0	37	.buf = &addr_lo,
9664877e FY	38	},
9664877e FY	39	{
62f548d0	40	.addr = client_addr,
9664877e FY	41	.flags = I2C_M_RD,
	42	.len = length,
	43	.buf = values,
	44	},
	45	};
	46	int retval;
	47
	48	retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
	49	if (retval < 0)
	50	return retval;
	51
	52	return retval != ARRAY_SIZE(msgs) ? -EIO : 0;
	53	}
	54	EXPORT_SYMBOL_GPL(cyttsp_i2c_read_block_data);
	55
	56	int cyttsp_i2c_write_block_data(struct device dev, u8 xfer_buf,
62f548d0	57	u16 addr, u8 length, const void *values)
9664877e FY	58	{
9664877e FY	59	struct i2c_client *client = to_i2c_client(dev);
62f548d0 FY	60	u8 client_addr = client->addr \| ((addr >> 8) & 0x1);
	61	u8 addr_lo = addr & 0xFF;
	62	struct i2c_msg msgs[] = {
	63	{
	64	.addr = client_addr,
	65	.flags = 0,
	66	.len = length + 1,
	67	.buf = xfer_buf,
	68	},
	69	};
9664877e FY	70	int retval;
9664877e FY	71
62f548d0	72	xfer_buf[0] = addr_lo;
9664877e FY	73	memcpy(&xfer_buf[1], values, length);
9664877e FY	74
62f548d0 FY	75	retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
	76	if (retval < 0)
	77	return retval;
9664877e	78
62f548d0	79	return retval != ARRAY_SIZE(msgs) ? -EIO : 0;
9664877e FY	80	}
	81	EXPORT_SYMBOL_GPL(cyttsp_i2c_write_block_data);
	82
	83
e17fb91c	84	MODULE_DESCRIPTION("Cypress TrueTouch(TM) Standard Product (TTSP) I2C touchscreen driver");
9664877e FY	85	MODULE_LICENSE("GPL");
9664877e FY	86	MODULE_AUTHOR("Cypress");