Input: cyttsp4 - SPI driver for Cypress TMA4XX touchscreen devices (67bf12ca) · Commits · e / devices / android_kernel_teracube_2e

drivers/input/touchscreen/Kconfig

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Original line number	Diff line number	Diff line
		@@ -188,6 +188,15 @@ config TOUCHSCREEN_CYTTSP4_I2C
		To compile this driver as a module, choose M here: the
		module will be called cyttsp4_i2c.

		config TOUCHSCREEN_CYTTSP4_SPI
		tristate "support SPI bus connection"
		depends on TOUCHSCREEN_CYTTSP4_CORE && SPI_MASTER
		help
		Say Y here if the touchscreen is connected via SPI bus.

		To compile this driver as a module, choose M here: the
		module will be called cyttsp4_spi.

		config TOUCHSCREEN_DA9034
		tristate "Touchscreen support for Dialog Semiconductor DA9034"
		depends on PMIC_DA903X

drivers/input/touchscreen/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -22,6 +22,7 @@ obj-$(CONFIG_TOUCHSCREEN_CYTTSP_I2C) += cyttsp_i2c.o cyttsp_i2c_common.o
		obj-$(CONFIG_TOUCHSCREEN_CYTTSP_SPI) += cyttsp_spi.o
		obj-$(CONFIG_TOUCHSCREEN_CYTTSP4_CORE) += cyttsp4_core.o
		obj-$(CONFIG_TOUCHSCREEN_CYTTSP4_I2C) += cyttsp4_i2c.o cyttsp_i2c_common.o
		obj-$(CONFIG_TOUCHSCREEN_CYTTSP4_SPI) += cyttsp4_spi.o
		obj-$(CONFIG_TOUCHSCREEN_DA9034) += da9034-ts.o
		obj-$(CONFIG_TOUCHSCREEN_DA9052) += da9052_tsi.o
		obj-$(CONFIG_TOUCHSCREEN_DYNAPRO) += dynapro.o

drivers/input/touchscreen/cyttsp4_spi.c

0 → 100644

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		/*
		* Source for:
		* Cypress TrueTouch(TM) Standard Product (TTSP) SPI touchscreen driver.
		* For use with Cypress Txx4xx parts.
		* Supported parts include:
		* TMA4XX
		* TMA1036
		*
		* Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc.
		* Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org>
		* Copyright (C) 2013 Cypress Semiconductor
		*
		* 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 "cyttsp4_core.h"

		#include <linux/delay.h>
		#include <linux/input.h>
		#include <linux/spi/spi.h>

		#define CY_SPI_WR_OP 0x00 /* r/~w */
		#define CY_SPI_RD_OP 0x01
		#define CY_SPI_BITS_PER_WORD 8
		#define CY_SPI_A8_BIT 0x02
		#define CY_SPI_WR_HEADER_BYTES 2
		#define CY_SPI_RD_HEADER_BYTES 1
		#define CY_SPI_CMD_BYTES 2
		#define CY_SPI_SYNC_BYTE 0
		#define CY_SPI_SYNC_ACK 0x62 /* from TRM A protocol /
		#define CY_SPI_DATA_SIZE (2 * 256)

		#define CY_SPI_DATA_BUF_SIZE (CY_SPI_CMD_BYTES + CY_SPI_DATA_SIZE)

		static int cyttsp_spi_xfer(struct device dev, u8 xfer_buf,
		u8 op, u8 reg, u8 *buf, int length)
		{
		struct spi_device *spi = to_spi_device(dev);
		struct spi_message msg;
		struct spi_transfer xfer[2];
		u8 *wr_buf = &xfer_buf[0];
		u8 rd_buf[CY_SPI_CMD_BYTES];
		int retval;
		int i;

		if (length > CY_SPI_DATA_SIZE) {
		dev_err(dev, "%s: length %d is too big.\n",
		__func__, length);
		return -EINVAL;
		}

		memset(wr_buf, 0, CY_SPI_DATA_BUF_SIZE);
		memset(rd_buf, 0, CY_SPI_CMD_BYTES);

		if (reg > 255)
		wr_buf[0] = op + CY_SPI_A8_BIT;
		else
		wr_buf[0] = op;
		if (op == CY_SPI_WR_OP)
		wr_buf[1] = reg % 256;
		if (op == CY_SPI_WR_OP && length > 0)
		memcpy(wr_buf + CY_SPI_CMD_BYTES, buf, length);

		memset(xfer, 0, sizeof(xfer));
		spi_message_init(&msg);

		/*
		We set both TX and RX buffers because Cypress TTSP
		requires full duplex operation.
		*/
		xfer[0].tx_buf = wr_buf;
		xfer[0].rx_buf = rd_buf;
		switch (op) {
		case CY_SPI_WR_OP:
		xfer[0].len = length + CY_SPI_CMD_BYTES;
		spi_message_add_tail(&xfer[0], &msg);
		break;

		case CY_SPI_RD_OP:
		xfer[0].len = CY_SPI_RD_HEADER_BYTES;
		spi_message_add_tail(&xfer[0], &msg);

		xfer[1].rx_buf = buf;
		xfer[1].len = length;
		spi_message_add_tail(&xfer[1], &msg);
		break;

		default:
		dev_err(dev, "%s: bad operation code=%d\n", __func__, op);
		return -EINVAL;
		}

		retval = spi_sync(spi, &msg);
		if (retval < 0) {
		dev_dbg(dev, "%s: spi_sync() error %d, len=%d, op=%d\n",
		__func__, retval, xfer[1].len, op);

		/*
		* do not return here since was a bad ACK sequence
		* let the following ACK check handle any errors and
		* allow silent retries
		*/
		}

		if (rd_buf[CY_SPI_SYNC_BYTE] != CY_SPI_SYNC_ACK) {
		dev_dbg(dev, "%s: operation %d failed\n", __func__, op);

		for (i = 0; i < CY_SPI_CMD_BYTES; i++)
		dev_dbg(dev, "%s: test rd_buf[%d]:0x%02x\n",
		__func__, i, rd_buf[i]);
		for (i = 0; i < length; i++)
		dev_dbg(dev, "%s: test buf[%d]:0x%02x\n",
		__func__, i, buf[i]);

		return -EIO;
		}

		return 0;
		}

		static int cyttsp_spi_read_block_data(struct device dev, u8 xfer_buf,
		u8 addr, u8 length, void *data)
		{
		int rc;

		rc = cyttsp_spi_xfer(dev, xfer_buf, CY_SPI_WR_OP, addr, NULL, 0);
		if (rc)
		return rc;
		else
		return cyttsp_spi_xfer(dev, xfer_buf, CY_SPI_RD_OP, addr, data,
		length);
		}

		static int cyttsp_spi_write_block_data(struct device dev, u8 xfer_buf,
		u8 addr, u8 length, const void *data)
		{
		return cyttsp_spi_xfer(dev, xfer_buf, CY_SPI_WR_OP, addr, (void *)data,
		length);
		}

		static const struct cyttsp4_bus_ops cyttsp_spi_bus_ops = {
		.bustype = BUS_SPI,
		.write = cyttsp_spi_write_block_data,
		.read = cyttsp_spi_read_block_data,
		};

		static int cyttsp4_spi_probe(struct spi_device *spi)
		{
		struct cyttsp4 *ts;
		int error;

		/* Set up SPI*/
		spi->bits_per_word = CY_SPI_BITS_PER_WORD;
		spi->mode = SPI_MODE_0;
		error = spi_setup(spi);
		if (error < 0) {
		dev_err(&spi->dev, "%s: SPI setup error %d\n",
		__func__, error);
		return error;
		}

		ts = cyttsp4_probe(&cyttsp_spi_bus_ops, &spi->dev, spi->irq,
		CY_SPI_DATA_BUF_SIZE);

		if (IS_ERR(ts))
		return PTR_ERR(ts);

		return 0;
		}

		static int cyttsp4_spi_remove(struct spi_device *spi)
		{
		struct cyttsp4 *ts = spi_get_drvdata(spi);
		cyttsp4_remove(ts);

		return 0;
		}

		static struct spi_driver cyttsp4_spi_driver = {
		.driver = {
		.name = CYTTSP4_SPI_NAME,
		.owner = THIS_MODULE,
		.pm = &cyttsp4_pm_ops,
		},
		.probe = cyttsp4_spi_probe,
		.remove = cyttsp4_spi_remove,
		};

		module_spi_driver(cyttsp4_spi_driver);

		MODULE_LICENSE("GPL");
		MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard Product (TTSP) SPI driver");
		MODULE_AUTHOR("Cypress");
		MODULE_ALIAS("spi:cyttsp4");