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

drivers/input/touchscreen/Kconfig

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	@@ -188,6 +188,15 @@ config TOUCHSCREEN_CYTTSP4_I2C
	To compile this driver as a module, choose M here: the		To compile this driver as a module, choose M here: the
	module will be called cyttsp4_i2c.		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		config TOUCHSCREEN_DA9034
	tristate "Touchscreen support for Dialog Semiconductor DA9034"		tristate "Touchscreen support for Dialog Semiconductor DA9034"
	depends on PMIC_DA903X		depends on PMIC_DA903X

drivers/input/touchscreen/Makefile

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Original line number	Original line	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-$(CONFIG_TOUCHSCREEN_CYTTSP_SPI) += cyttsp_spi.o
	obj-$(CONFIG_TOUCHSCREEN_CYTTSP4_CORE) += cyttsp4_core.o		obj-$(CONFIG_TOUCHSCREEN_CYTTSP4_CORE) += cyttsp4_core.o
	obj-$(CONFIG_TOUCHSCREEN_CYTTSP4_I2C) += cyttsp4_i2c.o cyttsp_i2c_common.o		obj-$(CONFIG_TOUCHSCREEN_CYTTSP4_I2C) += cyttsp4_i2c.o cyttsp_i2c_common.o
			obj-$(CONFIG_TOUCHSCREEN_CYTTSP4_SPI) += cyttsp4_spi.o
	obj-$(CONFIG_TOUCHSCREEN_DA9034) += da9034-ts.o		obj-$(CONFIG_TOUCHSCREEN_DA9034) += da9034-ts.o
	obj-$(CONFIG_TOUCHSCREEN_DA9052) += da9052_tsi.o		obj-$(CONFIG_TOUCHSCREEN_DA9052) += da9052_tsi.o
	obj-$(CONFIG_TOUCHSCREEN_DYNAPRO) += dynapro.o		obj-$(CONFIG_TOUCHSCREEN_DYNAPRO) += dynapro.o

drivers/input/touchscreen/cyttsp4_spi.c

0 → 100644

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Original line number	Original line	Diff line number	Diff line
			/*
			* 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");

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