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Gmane
From: Aaro Koskinen <aaro.koskinen <at> nokia.com>
Subject: [PATCH] input: touchscreen: introduce tsc2005 driver
Newsgroups: gmane.linux.kernel
Date: Wednesday 14th October 2009 13:40:22 UTC (over 7 years ago)
From: Lauri Leukkunen 

Introduce a driver for the Texas Instruments TSC2005 touchscreen
controller. It is one of the peripherals on the RX-51 board.

Includes additional modifications by David Brownell, Phil Carmody,
Imre Deak, Hiroshi DOYU, Ari Kauppi, Tony Lindgren, Jarkko Nikula,
Eero Nurkkala and Roman Tereshonkov.

Signed-off-by: Lauri Leukkunen 
[[email protected]: patch description, rebasing & cleanup]
Signed-off-by: Aaro Koskinen 
CC: David Brownell 
CC: Phil Carmody 
CC: Imre Deak 
CC: Hiroshi DOYU 
CC: Ari Kauppi 
CC: Tony Lindgren 
CC: Jarkko Nikula <[email protected]>
CC: Eero Nurkkala 
CC: Roman Tereshonkov 
---
 arch/arm/configs/rx51_defconfig              |    1 +
 arch/arm/mach-omap2/board-rx51-peripherals.c |   66 ++
 drivers/input/touchscreen/Kconfig            |   11 +
 drivers/input/touchscreen/Makefile           |    1 +
 drivers/input/touchscreen/tsc2005.c          |  958
++++++++++++++++++++++++++
 include/linux/spi/tsc2005.h                  |   30 +
 6 files changed, 1067 insertions(+), 0 deletions(-)
 create mode 100644 drivers/input/touchscreen/tsc2005.c
 create mode 100644 include/linux/spi/tsc2005.h

diff --git a/arch/arm/configs/rx51_defconfig
b/arch/arm/configs/rx51_defconfig
index e7e3133..b10de8f 100644
--- a/arch/arm/configs/rx51_defconfig
+++ b/arch/arm/configs/rx51_defconfig
@@ -802,6 +802,7 @@ CONFIG_INPUT_TOUCHSCREEN=y
 # CONFIG_TOUCHSCREEN_TOUCHWIN is not set
 # CONFIG_TOUCHSCREEN_USB_COMPOSITE is not set
 # CONFIG_TOUCHSCREEN_TOUCHIT213 is not set
+CONFIG_TOUCHSCREEN_TSC2005=m
 # CONFIG_TOUCHSCREEN_TSC2007 is not set
 CONFIG_INPUT_MISC=y
 # CONFIG_INPUT_ATI_REMOTE is not set
diff --git a/arch/arm/mach-omap2/board-rx51-peripherals.c
b/arch/arm/mach-omap2/board-rx51-peripherals.c
index c1af532..21d0b2b 100644
--- a/arch/arm/mach-omap2/board-rx51-peripherals.c
+++ b/arch/arm/mach-omap2/board-rx51-peripherals.c
@@ -13,6 +13,7 @@
 #include 
 #include 
 #include 
+#include 
 #include 
 #include 
 #include 
@@ -509,6 +510,68 @@ static inline void board_onenand_init(void)
 
 #endif
 
+#define	RX51_TSC2005_RESET_GPIO	104
+#define	RX51_TSC2005_IRQ_GPIO	100
+
+static struct omap2_mcspi_device_config tsc2005_mcspi_config = {
+	.turbo_mode     = 0,
+	.single_channel = 1,
+};
+
+static struct tsc2005_platform_data tsc2005_config = {
+	.ts_x_plate_ohm		= 280,
+	.ts_hw_avg		= 0,
+	.ts_touch_pressure	= 1500,
+	.ts_stab_time		= 1000,
+	.ts_pressure_max	= 2048,
+	.ts_pressure_fudge	= 2,
+	.ts_x_max		= 4096,
+	.ts_x_fudge		= 4,
+	.ts_y_max		= 4096,
+	.ts_y_fudge		= 7,
+
+	.esd_timeout		= 8*1000, /* ms of inactivity before we check */
+
+	.set_reset		= NULL,
+};
+
+static void rx51_tsc2005_set_reset(bool enable)
+{
+	gpio_set_value(RX51_TSC2005_RESET_GPIO, enable);
+}
+
+static void __init rx51_init_tsc2005(void)
+{
+	int r;
+
+	r = gpio_request(RX51_TSC2005_IRQ_GPIO, "tsc2005 DAV IRQ");
+	if (r >= 0)
+		gpio_direction_input(RX51_TSC2005_IRQ_GPIO);
+	else
+		printk(KERN_ERR "unable to get %s GPIO\n", "tsc2005 DAV IRQ");
+
+	r = gpio_request(RX51_TSC2005_RESET_GPIO, "tsc2005 reset");
+	if (r >= 0) {
+		gpio_direction_output(RX51_TSC2005_RESET_GPIO, 1);
+		tsc2005_config.set_reset = rx51_tsc2005_set_reset;
+	} else {
+		printk(KERN_ERR "unable to get %s GPIO\n", "tsc2005 reset");
+		tsc2005_config.esd_timeout = 0;
+	}
+}
+
+static struct spi_board_info rx51_peripherals_spi_board_info[] = {
+	[0] = {
+		.modalias		= "tsc2005",
+		.bus_num		= 1,
+		.chip_select		= 0,
+		.irq			= OMAP_GPIO_IRQ(RX51_TSC2005_IRQ_GPIO),
+		.max_speed_hz		= 6000000,
+		.controller_data	= &tsc2005_mcspi_config,
+		.platform_data		= &tsc2005_config,
+	},
+};
+
 #if defined(CONFIG_SMC91X) || defined(CONFIG_SMC91X_MODULE)
 
 static struct omap_smc91x_platform_data board_smc91x_data = {
@@ -538,6 +601,9 @@ static inline void board_smc91x_init(void)
 
 void __init rx51_peripherals_init(void)
 {
+	spi_register_board_info(rx51_peripherals_spi_board_info,
+				ARRAY_SIZE(rx51_peripherals_spi_board_info));
+	rx51_init_tsc2005();
 	rx51_i2c_init();
 	board_onenand_init();
 	board_smc91x_init();
diff --git a/drivers/input/touchscreen/Kconfig
b/drivers/input/touchscreen/Kconfig
index 8cc453c..b758ba8 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -501,6 +501,17 @@ config TOUCHSCREEN_TOUCHIT213
 	  To compile this driver as a module, choose M here: the
 	  module will be called touchit213.
 
+config TOUCHSCREEN_TSC2005
+        tristate "TSC2005 based touchscreens"
+        depends on SPI_MASTER
+        help
+          Say Y here if you have a TSC2005 based touchscreen.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called tsc2005.
+
 config TOUCHSCREEN_TSC2007
 	tristate "TSC2007 based touchscreens"
 	depends on I2C
diff --git a/drivers/input/touchscreen/Makefile
b/drivers/input/touchscreen/Makefile
index 15fa62c..0626f9f 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_TOUCHSCREEN_PENMOUNT)	+= penmount.o
 obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213)	+= touchit213.o
 obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT)	+= touchright.o
 obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN)	+= touchwin.o
+obj-$(CONFIG_TOUCHSCREEN_TSC2005)	+= tsc2005.o
 obj-$(CONFIG_TOUCHSCREEN_TSC2007)	+= tsc2007.o
 obj-$(CONFIG_TOUCHSCREEN_UCB1400)	+= ucb1400_ts.o
 obj-$(CONFIG_TOUCHSCREEN_WACOM_W8001)	+= wacom_w8001.o
diff --git a/drivers/input/touchscreen/tsc2005.c
b/drivers/input/touchscreen/tsc2005.c
new file mode 100644
index 0000000..abc0548
--- /dev/null
+++ b/drivers/input/touchscreen/tsc2005.c
@@ -0,0 +1,958 @@
+/*
+ * TSC2005 touchscreen driver
+ *
+ * Copyright (C) 2006-2008 Nokia Corporation
+ *
+ * Author: Lauri Leukkunen 
+ * based on TSC2301 driver by Klaus K. Pedersen

+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+
+#include 
+
+/**
+ * The touchscreen interface operates as follows:
+ *
+ * Initialize:
+ *    Request access to GPIO103 (DAV)
+ *    tsc2005_ts_irq_handler will trigger when DAV line goes down
+ *
+ *  1) Pen is pressed against touchscreeen
+ *  2) TSC2005 performs AD conversion
+ *  3) After the conversion is done TSC2005 drives DAV line down
+ *  4) GPIO IRQ is received and tsc2005_ts_irq_handler is called
+ *  5) tsc2005_ts_irq_handler queues up an spi transfer to fetch
+ *     the x, y, z1, z2 values
+ *  6) tsc2005_ts_rx() reports coordinates to input layer and
+ *     sets up tsc2005_ts_timer() to be called after TSC2005_TS_SCAN_TIME
+ *  7)  When the penup_timer expires, there have not been DAV interrupts
+ *     during the last 20ms which means the pen has been lifted.
+ */
+
+#define TSC2005_VDD_LOWER_27
+
+#ifdef TSC2005_VDD_LOWER_27
+#define TSC2005_HZ     (10000000)
+#else
+#define TSC2005_HZ     (25000000)
+#endif
+
+#define TSC2005_CMD	(0x80)
+#define TSC2005_REG	(0x00)
+
+#define TSC2005_CMD_STOP	(1)
+#define TSC2005_CMD_10BIT	(0 << 2)
+#define TSC2005_CMD_12BIT	(1 << 2)
+
+#define TSC2005_CMD_SCAN_XYZZ	(0 << 3)
+#define TSC2005_CMD_SCAN_XY	(1 << 3)
+#define TSC2005_CMD_SCAN_X	(2 << 3)
+#define TSC2005_CMD_SCAN_Y	(3 << 3)
+#define TSC2005_CMD_SCAN_ZZ	(4 << 3)
+#define TSC2005_CMD_AUX_SINGLE	(5 << 3)
+#define TSC2005_CMD_TEMP1	(6 << 3)
+#define TSC2005_CMD_TEMP2	(7 << 3)
+#define TSC2005_CMD_AUX_CONT	(8 << 3)
+#define TSC2005_CMD_TEST_X_CONN	(9 << 3)
+#define TSC2005_CMD_TEST_Y_CONN	(10 << 3)
+#define TSC2005_CMD_TEST_SHORT	(11 << 3)
+/* command 12 reserved, according to 2008-03 erratum */
+#define TSC2005_CMD_DRIVE_XX	(13 << 3)
+#define TSC2005_CMD_DRIVE_YY	(14 << 3)
+#define TSC2005_CMD_DRIVE_YX	(15 << 3)
+
+#define TSC2005_REG_X		(0 << 3)
+#define TSC2005_REG_Y		(1 << 3)
+#define TSC2005_REG_Z1		(2 << 3)
+#define TSC2005_REG_Z2		(3 << 3)
+#define TSC2005_REG_AUX		(4 << 3)
+#define TSC2005_REG_TEMP1	(5 << 3)
+#define TSC2005_REG_TEMP2	(6 << 3)
+#define TSC2005_REG_STATUS	(7 << 3)
+#define TSC2005_REG_AUX_HIGH	(8 << 3)
+#define TSC2005_REG_AUX_LOW	(9 << 3)
+#define TSC2005_REG_TEMP_HIGH	(10 << 3)
+#define TSC2005_REG_TEMP_LOW	(11 << 3)
+#define TSC2005_REG_CFR0	(12 << 3)
+#define TSC2005_REG_CFR1	(13 << 3)
+#define TSC2005_REG_CFR2	(14 << 3)
+#define TSC2005_REG_FUNCTION	(15 << 3)
+
+#define TSC2005_REG_PND0	(1 << 1)
+#define TSC2005_REG_READ	(0x01)
+#define TSC2005_REG_WRITE	(0x00)
+
+
+#define TSC2005_CFR0_LONGSAMPLING	(1)
+#define TSC2005_CFR0_DETECTINWAIT	(1 << 1)
+#define TSC2005_CFR0_SENSETIME_32US	(0)
+#define TSC2005_CFR0_SENSETIME_96US	(1 << 2)
+#define TSC2005_CFR0_SENSETIME_544US	(1 << 3)
+#define TSC2005_CFR0_SENSETIME_2080US	(1 << 4)
+#define TSC2005_CFR0_SENSETIME_2656US	(0x001C)
+#define TSC2005_CFR0_PRECHARGE_20US	(0x0000)
+#define TSC2005_CFR0_PRECHARGE_84US	(0x0020)
+#define TSC2005_CFR0_PRECHARGE_276US	(0x0040)
+#define TSC2005_CFR0_PRECHARGE_1044US	(0x0080)
+#define TSC2005_CFR0_PRECHARGE_1364US	(0x00E0)
+#define TSC2005_CFR0_STABTIME_0US	(0x0000)
+#define TSC2005_CFR0_STABTIME_100US	(0x0100)
+#define TSC2005_CFR0_STABTIME_500US	(0x0200)
+#define TSC2005_CFR0_STABTIME_1MS	(0x0300)
+#define TSC2005_CFR0_STABTIME_5MS	(0x0400)
+#define TSC2005_CFR0_STABTIME_100MS	(0x0700)
+#define TSC2005_CFR0_CLOCK_4MHZ		(0x0000)
+#define TSC2005_CFR0_CLOCK_2MHZ		(0x0800)
+#define TSC2005_CFR0_CLOCK_1MHZ		(0x1000)
+#define TSC2005_CFR0_RESOLUTION12	(0x2000)
+#define TSC2005_CFR0_STATUS		(0x4000)
+#define TSC2005_CFR0_PENMODE		(0x8000)
+
+#define TSC2005_CFR0_INITVALUE	(TSC2005_CFR0_STABTIME_1MS  |	\
+				 TSC2005_CFR0_CLOCK_1MHZ    |	\
+				 TSC2005_CFR0_RESOLUTION12  |	\
+				 TSC2005_CFR0_PRECHARGE_276US | \
+				 TSC2005_CFR0_PENMODE)
+
+/* Bits common to both read and write of config register 0 */
+#define	TSC2005_CFR0_RW_MASK	0x3fff
+
+#define TSC2005_CFR1_BATCHDELAY_0MS	(0x0000)
+#define TSC2005_CFR1_BATCHDELAY_1MS	(0x0001)
+#define TSC2005_CFR1_BATCHDELAY_2MS	(0x0002)
+#define TSC2005_CFR1_BATCHDELAY_4MS	(0x0003)
+#define TSC2005_CFR1_BATCHDELAY_10MS	(0x0004)
+#define TSC2005_CFR1_BATCHDELAY_20MS	(0x0005)
+#define TSC2005_CFR1_BATCHDELAY_40MS	(0x0006)
+#define TSC2005_CFR1_BATCHDELAY_100MS	(0x0007)
+
+#define TSC2005_CFR1_INITVALUE	(TSC2005_CFR1_BATCHDELAY_4MS)
+
+#define TSC2005_CFR2_MAVE_TEMP	(0x0001)
+#define TSC2005_CFR2_MAVE_AUX	(0x0002)
+#define TSC2005_CFR2_MAVE_Z	(0x0004)
+#define TSC2005_CFR2_MAVE_Y	(0x0008)
+#define TSC2005_CFR2_MAVE_X	(0x0010)
+#define TSC2005_CFR2_AVG_1	(0x0000)
+#define TSC2005_CFR2_AVG_3	(0x0400)
+#define TSC2005_CFR2_AVG_7	(0x0800)
+#define TSC2005_CFR2_MEDIUM_1	(0x0000)
+#define TSC2005_CFR2_MEDIUM_3	(0x1000)
+#define TSC2005_CFR2_MEDIUM_7	(0x2000)
+#define TSC2005_CFR2_MEDIUM_15	(0x3000)
+
+#define TSC2005_CFR2_IRQ_MASK   (0xC000)
+#define TSC2005_CFR2_IRQ_DAV	(0x4000)
+#define TSC2005_CFR2_IRQ_PEN	(0x8000)
+#define TSC2005_CFR2_IRQ_PENDAV	(0x0000)
+
+#define TSC2005_CFR2_INITVALUE	(TSC2005_CFR2_IRQ_PENDAV |	\
+				 TSC2005_CFR2_MAVE_X    |	\
+				 TSC2005_CFR2_MAVE_Y    |	\
+				 TSC2005_CFR2_MAVE_Z    |	\
+				 TSC2005_CFR2_MEDIUM_15 |	\
+				 TSC2005_CFR2_AVG_7)
+
+#define MAX_12BIT					((1 << 12) - 1)
+#define TS_SAMPLES					4
+#define TSC2005_TS_PENUP_TIME				40
+
+static const u32 tsc2005_read_reg[] = {
+	(TSC2005_REG | TSC2005_REG_X | TSC2005_REG_READ) << 16,
+	(TSC2005_REG | TSC2005_REG_Y | TSC2005_REG_READ) << 16,
+	(TSC2005_REG | TSC2005_REG_Z1 | TSC2005_REG_READ) << 16,
+	(TSC2005_REG | TSC2005_REG_Z2 | TSC2005_REG_READ) << 16,
+};
+#define
NUM_READ_REGS	(sizeof(tsc2005_read_reg)/sizeof(tsc2005_read_reg[0]))
+
+struct tsc2005 {
+	struct spi_device	*spi;
+
+	struct input_dev	*idev;
+	char			phys[32];
+	struct timer_list	penup_timer;
+
+	/* ESD recovery via a hardware reset if the tsc2005
+	 * doesn't respond after a configurable period (in ms) of
+	 * IRQ/SPI inactivity. If esd_timeout is 0, timer and work
+	 * fields are used.
+	 */
+	u32			esd_timeout;
+	struct timer_list	esd_timer;
+	struct work_struct	esd_work;
+
+	spinlock_t		lock;
+	struct mutex		mutex;
+
+	struct spi_message	read_msg;
+	struct spi_transfer	read_xfer[NUM_READ_REGS];
+	u32                     data[NUM_READ_REGS];
+
+	/* previously reported x,y,p (if pen_down) */
+	int			out_x;
+	int			out_y;
+	int			out_p;
+	/* fudge parameters - changes must exceed one of these. */
+	int			fudge_x;
+	int			fudge_y;
+	int			fudge_p;
+	/* raw copy of previous x,y,z */
+	int			in_x;
+	int			in_y;
+	int			in_z1;
+	int			in_z2;
+	/* average accumulators for each component */
+	int			sample_cnt;
+	int			avg_x;
+	int			avg_y;
+	int			avg_z1;
+	int			avg_z2;
+	/* configuration */
+	int			x_plate_ohm;
+	int			hw_avg_max;
+	int			stab_time;
+	int			p_max;
+	int			touch_pressure;
+	/* status */
+	u8			sample_sent;
+	u8			pen_down;
+	u8			disabled;
+	u8			disable_depth;
+	u8			spi_pending;
+
+	void (*set_reset)(bool enable);
+};
+
+static void tsc2005_cmd(struct tsc2005 *ts, u8 cmd)
+{
+	u8 data = TSC2005_CMD | TSC2005_CMD_12BIT | cmd;
+	struct spi_message msg;
+	struct spi_transfer xfer = { 0 };
+
+	xfer.tx_buf = &data;
+	xfer.rx_buf = NULL;
+	xfer.len = 1;
+	xfer.bits_per_word = 8;
+
+	spi_message_init(&msg);
+	spi_message_add_tail(&xfer, &msg);
+	spi_sync(ts->spi, &msg);
+}
+
+static void tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value)
+{
+	u32 tx;
+	struct spi_message msg;
+	struct spi_transfer xfer = { 0 };
+
+	tx = (TSC2005_REG | reg | TSC2005_REG_PND0 |
+	       TSC2005_REG_WRITE) << 16;
+	tx |= value;
+
+	xfer.tx_buf = &tx;
+	xfer.rx_buf = NULL;
+	xfer.len = 4;
+	xfer.bits_per_word = 24;
+
+	spi_message_init(&msg);
+	spi_message_add_tail(&xfer, &msg);
+	spi_sync(ts->spi, &msg);
+}
+
+static void tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value)
+{
+	u32 tx;
+	u32 rx = 0;
+	struct spi_message msg;
+	struct spi_transfer xfer = { 0 };
+
+	tx = (TSC2005_REG | reg | TSC2005_REG_READ) << 16;
+
+	xfer.tx_buf = &tx;
+	xfer.rx_buf = ℞
+	xfer.len = 4;
+	xfer.bits_per_word = 24;
+
+	spi_message_init(&msg);
+	spi_message_add_tail(&xfer, &msg);
+	spi_sync(ts->spi, &msg);
+	*value = rx;
+}
+
+static void tsc2005_ts_update_pen_state(struct tsc2005 *ts,
+					int x, int y, int pressure)
+{
+	if (pressure) {
+		input_report_abs(ts->idev, ABS_X, x);
+		input_report_abs(ts->idev, ABS_Y, y);
+		input_report_abs(ts->idev, ABS_PRESSURE, pressure);
+		if (!ts->pen_down) {
+			input_report_key(ts->idev, BTN_TOUCH, 1);
+			ts->pen_down = 1;
+		}
+	} else {
+		input_report_abs(ts->idev, ABS_PRESSURE, 0);
+		if (ts->pen_down) {
+			input_report_key(ts->idev, BTN_TOUCH, 0);
+			ts->pen_down = 0;
+		}
+	}
+
+	input_sync(ts->idev);
+}
+
+/*
+ * This function is called by the SPI framework after the coordinates
+ * have been read from TSC2005
+ */
+static void tsc2005_ts_rx(void *arg)
+{
+	struct tsc2005 *ts = arg;
+	unsigned long flags;
+	int inside_rect, pressure_limit;
+	int x, y, z1, z2, pressure;
+
+	spin_lock_irqsave(&ts->lock, flags);
+
+	if (ts->disable_depth) {
+		ts->spi_pending = 0;
+		goto out;
+	}
+
+	x = ts->data[0];
+	y = ts->data[1];
+	z1 = ts->data[2];
+	z2 = ts->data[3];
+
+	/* validate pressure and position */
+	if (x > MAX_12BIT || y > MAX_12BIT)
+		goto out;
+
+	/* skip coords if the pressure-components are out of range */
+	if (z1 < 100 || z2 > MAX_12BIT || z1 >= z2)
+		goto out;
+
+	/* skip point if this is a pen down with the exact same values as
+	 * the value before pen-up - that implies SPI fed us stale data
+	 */
+	if (!ts->pen_down &&
+	    ts->in_x == x &&
+	    ts->in_y == y &&
+	    ts->in_z1 == z1 &&
+	    ts->in_z2 == z2)
+		goto out;
+
+	/* At this point we are happy we have a valid and useful reading.
+	 * Remember it for later comparisons. We may now begin downsampling
+	 */
+	ts->in_x = x;
+	ts->in_y = y;
+	ts->in_z1 = z1;
+	ts->in_z2 = z2;
+
+	/* don't run average on the "pen down" event */
+	if (ts->sample_sent) {
+		ts->avg_x += x;
+		ts->avg_y += y;
+		ts->avg_z1 += z1;
+		ts->avg_z2 += z2;
+
+		if (++ts->sample_cnt < TS_SAMPLES)
+			goto out;
+
+		x = ts->avg_x / TS_SAMPLES;
+		y = ts->avg_y / TS_SAMPLES;
+		z1 = ts->avg_z1 / TS_SAMPLES;
+		z2 = ts->avg_z2 / TS_SAMPLES;
+	}
+
+	ts->sample_cnt = 0;
+	ts->avg_x = 0;
+	ts->avg_y = 0;
+	ts->avg_z1 = 0;
+	ts->avg_z2 = 0;
+
+	pressure = x * (z2 - z1) / z1;
+	pressure = pressure * ts->x_plate_ohm / 4096;
+
+	pressure_limit = ts->sample_sent ? ts->p_max : ts->touch_pressure;
+	if (pressure > pressure_limit)
+		goto out;
+
+	/* Discard the event if it still is within the previous rect -
+	 * unless the pressure is clearly harder, but then use previous
+	 * x,y position. If any coordinate deviates enough, fudging
+	 * of all three will still take place in the input layer.
+	 */
+	inside_rect = (ts->sample_sent &&
+		x > (int)ts->out_x - ts->fudge_x &&
+		x < (int)ts->out_x + ts->fudge_x &&
+		y > (int)ts->out_y - ts->fudge_y &&
+		y < (int)ts->out_y + ts->fudge_y);
+	if (inside_rect)
+		x = ts->out_x, y = ts->out_y;
+
+	if (!inside_rect || pressure < (ts->out_p - ts->fudge_p)) {
+		tsc2005_ts_update_pen_state(ts, x, y, pressure);
+		ts->sample_sent = 1;
+		ts->out_x = x;
+		ts->out_y = y;
+		ts->out_p = pressure;
+	}
+out:
+	if (ts->spi_pending > 1) {
+		/* One or more interrupts (sometimes several dozens)
+		 * occured while waiting for the SPI read - get
+		 * another read going.
+		 */
+		ts->spi_pending = 1;
+		if (spi_async(ts->spi, &ts->read_msg)) {
+			dev_err(&ts->spi->dev, "ts: spi_async() failed");
+			ts->spi_pending = 0;
+		}
+	} else
+		ts->spi_pending = 0;
+
+	/* kick pen up timer - to make sure it expires again(!) */
+	if (ts->sample_sent) {
+		mod_timer(&ts->penup_timer,
+			  jiffies + msecs_to_jiffies(TSC2005_TS_PENUP_TIME));
+		/* Also kick the watchdog, as we still think we're alive */
+		if (ts->esd_timeout && ts->disable_depth == 0) {
+			unsigned long wdj = msecs_to_jiffies(ts->esd_timeout);
+			mod_timer(&ts->esd_timer, round_jiffies(jiffies+wdj));
+		}
+	}
+	spin_unlock_irqrestore(&ts->lock, flags);
+}
+
+/* This penup timer is very forgiving of delayed SPI reads. The
+ * (ESD) watchdog will rescue us if spi_pending remains set, unless
+ * we are enterring the disabled state. In that case we must just
+ * handle the pen up, and let disabling complete.
+ */
+static void tsc2005_ts_penup_timer_handler(unsigned long data)
+{
+	struct tsc2005 *ts = (struct tsc2005 *)data;
+	if ((!ts->spi_pending || ts->disable_depth) &&
+	    ts->sample_sent) {
+		tsc2005_ts_update_pen_state(ts, 0, 0, 0);
+		ts->sample_sent = 0;
+	}
+}
+
+/*
+ * This interrupt is called when pen is down and coordinates are
+ * available. That is indicated by a either:
+ * a) a rising edge on PINTDAV or (PENDAV mode)
+ * b) a falling edge on DAV line (DAV mode)
+ * depending on the setting of the IRQ bits in the CFR2 setting above.
+ */
+static irqreturn_t tsc2005_ts_irq_handler(int irq, void *dev_id)
+{
+	struct tsc2005 *ts = dev_id;
+	if (ts->disable_depth)
+		goto out;
+
+	if (!ts->spi_pending) {
+		if (spi_async(ts->spi, &ts->read_msg)) {
+			dev_err(&ts->spi->dev, "ts: spi_async() failed");
+			goto out;
+		}
+	}
+	/* By shifting in 1s we can never wrap */
+	ts->spi_pending = (ts->spi_pending<<1)+1;
+
+	/* Kick pen up timer only if it's not been started yet. Strictly,
+	 * it isn't even necessary to start it at all here,  but doing so
+	 * keeps an equivalence between pen state and timer state.
+	 * The SPI read loop will keep pushing it into the future.
+	 * If it times out with an SPI pending, it's ignored anyway.
+	 */
+	if (!timer_pending(&ts->penup_timer)) {
+		unsigned long pu = msecs_to_jiffies(TSC2005_TS_PENUP_TIME);
+		ts->penup_timer.expires = jiffies + pu;
+		add_timer(&ts->penup_timer);
+	}
+out:
+	return IRQ_HANDLED;
+}
+
+static void tsc2005_ts_setup_spi_xfer(struct tsc2005 *ts)
+{
+	struct spi_message *m = &ts->read_msg;
+	struct spi_transfer *x = &ts->read_xfer[0];
+	int i;
+
+	spi_message_init(m);
+
+	for (i = 0; i < NUM_READ_REGS; i++, x++) {
+		x->tx_buf = &tsc2005_read_reg[i];
+		x->rx_buf = &ts->data[i];
+		x->len = 4;
+		x->bits_per_word = 24;
+		x->cs_change = i < (NUM_READ_REGS - 1);
+		spi_message_add_tail(x, m);
+	}
+
+	m->complete = tsc2005_ts_rx;
+	m->context = ts;
+}
+
+static ssize_t tsc2005_ts_pen_down_show(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	struct tsc2005 *ts = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", ts->pen_down);
+}
+
+static DEVICE_ATTR(pen_down, S_IRUGO, tsc2005_ts_pen_down_show, NULL);
+
+static int tsc2005_configure(struct tsc2005 *ts, int flags)
+{
+	tsc2005_write(ts, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE);
+	tsc2005_write(ts, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE);
+	tsc2005_write(ts, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE);
+	tsc2005_cmd(ts, flags);
+
+	return 0;
+}
+
+static void tsc2005_start_scan(struct tsc2005 *ts)
+{
+	tsc2005_configure(ts, TSC2005_CMD_SCAN_XYZZ);
+}
+
+static void tsc2005_stop_scan(struct tsc2005 *ts)
+{
+	tsc2005_cmd(ts, TSC2005_CMD_STOP);
+}
+
+/* Must be called with mutex held */
+static void tsc2005_disable(struct tsc2005 *ts)
+{
+	if (ts->disable_depth++ != 0)
+		return;
+
+	disable_irq(ts->spi->irq);
+	if (ts->esd_timeout)
+		del_timer(&ts->esd_timer);
+
+	/* wait until penup timer expire normally */
+	do {
+		msleep(4);
+	} while (ts->sample_sent);
+
+	tsc2005_stop_scan(ts);
+}
+
+static void tsc2005_enable(struct tsc2005 *ts)
+{
+	if (ts->disable_depth != 1)
+		goto out;
+
+	if (ts->esd_timeout) {
+		unsigned long wdj = msecs_to_jiffies(ts->esd_timeout);
+		ts->esd_timer.expires = round_jiffies(jiffies+wdj);
+		add_timer(&ts->esd_timer);
+	}
+	tsc2005_start_scan(ts);
+	enable_irq(ts->spi->irq);
+out:
+	--ts->disable_depth;
+}
+
+static ssize_t tsc2005_disable_show(struct device *dev,
+				    struct device_attribute *attr, char *buf)
+{
+	struct tsc2005 *ts = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", ts->disabled);
+}
+
+static ssize_t tsc2005_disable_store(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	struct tsc2005		*ts = dev_get_drvdata(dev);
+	unsigned long res;
+	int i;
+
+	if (strict_strtoul(buf, 10, &res) < 0)
+		return -EINVAL;
+	i = res ? 1 : 0;
+
+	mutex_lock(&ts->mutex);
+	if (i == ts->disabled)
+		goto out;
+	ts->disabled = i;
+
+	if (i)
+		tsc2005_disable(ts);
+	else
+		tsc2005_enable(ts);
+out:
+	mutex_unlock(&ts->mutex);
+	return count;
+}
+
+static DEVICE_ATTR(disable_ts, 0664, tsc2005_disable_show,
+		   tsc2005_disable_store);
+
+static ssize_t tsc2005_ctrl_selftest_show(struct device *dev,
+					  struct device_attribute *attr,
+					  char *buf)
+{
+	u16 temp_high_orig, temp_high_test, temp_high;
+	unsigned int result = 1;
+	struct tsc2005 *ts = dev_get_drvdata(dev);
+
+	if (!ts->set_reset) {
+		dev_warn(&ts->spi->dev,
+			 "unable to selftest: reset not configured\n");
+		result = 0;
+		goto out;
+	}
+
+	mutex_lock(&ts->mutex);
+	tsc2005_disable(ts);
+
+	/* Test ctrl communications via temp high / low registers */
+	tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig);
+
+	temp_high_test = (temp_high_orig - 1) & 0x0FFF;
+
+	tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test);
+
+	tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
+
+	if (temp_high != temp_high_test) {
+		result = 0;
+		dev_warn(dev, "selftest failed: %d != %d\n",
+			 temp_high, temp_high_test);
+	}
+
+	/* HW Reset */
+	ts->set_reset(0);
+	msleep(1); /* only 10us required */
+	ts->set_reset(1);
+
+	tsc2005_enable(ts);
+
+	/* Test that reset really happened */
+	tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
+
+	if (temp_high != temp_high_orig) {
+		result = 0;
+		dev_warn(dev, "selftest failed after reset: "
+			 "%d != %d\n",
+			 temp_high, temp_high_orig);
+	}
+
+	mutex_unlock(&ts->mutex);
+
+out:
+	return sprintf(buf, "%u\n", result);
+}
+
+static DEVICE_ATTR(ts_ctrl_selftest, S_IRUGO, tsc2005_ctrl_selftest_show,
NULL);
+
+static void tsc2005_esd_timer_handler(unsigned long data)
+{
+	struct tsc2005 *ts = (struct tsc2005 *)data;
+	if (!ts->disable_depth)
+		schedule_work(&ts->esd_work);
+}
+
+static void tsc2005_rst_handler(struct work_struct *work)
+{
+	u16 reg_val;
+	struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work);
+	unsigned long wdj;
+
+	mutex_lock(&ts->mutex);
+
+	/* If we are disabled, or the a touch has been detected,
+	 * then ignore this timeout. The enable will restart the
+	 * watchdog, as it restarts scanning
+	 */
+	if (ts->disable_depth)
+		goto out;
+
+	/* If we cannot read our known value from configuration register 0
+	 * then reset the controller as if from power-up and start
+	 * scanning again. Always re-arm the watchdog.
+	 */
+	tsc2005_read(ts, TSC2005_REG_CFR0, ®_val);
+	if ((reg_val ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK) {
+		dev_info(&ts->spi->dev, "TSC not responding, resetting.\n");
+		/* If this timer kicked in, the penup timer, if ever active
+		 * at all, must have expired ages ago, so no need to del it.
+		 */
+		ts->set_reset(0);
+		if (ts->sample_sent) {
+			tsc2005_ts_update_pen_state(ts, 0, 0, 0);
+			ts->sample_sent = 0;
+		}
+		ts->spi_pending = 0;
+		msleep(1); /* only 10us required */
+		ts->set_reset(1);
+		tsc2005_start_scan(ts);
+	}
+	wdj = msecs_to_jiffies(ts->esd_timeout);
+	mod_timer(&ts->esd_timer, round_jiffies(jiffies+wdj));
+
+out:
+	mutex_unlock(&ts->mutex);
+}
+
+static int __devinit tsc2005_ts_init(struct tsc2005 *ts,
+				     struct tsc2005_platform_data *pdata)
+{
+	struct input_dev *idev;
+	int r;
+	int x_max, y_max;
+
+	init_timer(&ts->penup_timer);
+	setup_timer(&ts->penup_timer, tsc2005_ts_penup_timer_handler,
+			(unsigned long)ts);
+
+	spin_lock_init(&ts->lock);
+	mutex_init(&ts->mutex);
+
+	ts->x_plate_ohm		= pdata->ts_x_plate_ohm ? : 280;
+	ts->hw_avg_max		= pdata->ts_hw_avg;
+	ts->stab_time		= pdata->ts_stab_time;
+	x_max			= pdata->ts_x_max ? : 4096;
+	ts->fudge_x		= pdata->ts_x_fudge ? : 4;
+	y_max			= pdata->ts_y_max ? : 4096;
+	ts->fudge_y		= pdata->ts_y_fudge ? : 8;
+	ts->p_max		= pdata->ts_pressure_max ? : MAX_12BIT;
+	ts->touch_pressure	= pdata->ts_touch_pressure ? : ts->p_max;
+	ts->fudge_p		= pdata->ts_pressure_fudge ? : 2;
+
+	ts->set_reset		= pdata->set_reset;
+
+	idev = input_allocate_device();
+	if (idev == NULL) {
+		r = -ENOMEM;
+		goto err1;
+	}
+
+	idev->name = "TSC2005 touchscreen";
+	snprintf(ts->phys, sizeof(ts->phys), "%s/input-ts",
+		 dev_name(&ts->spi->dev));
+	idev->phys = ts->phys;
+
+	idev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
+	idev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE);
+	idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+	ts->idev = idev;
+
+	tsc2005_ts_setup_spi_xfer(ts);
+
+	input_set_abs_params(idev, ABS_X, 0, x_max, ts->fudge_x, 0);
+	input_set_abs_params(idev, ABS_Y, 0, y_max, ts->fudge_y, 0);
+	input_set_abs_params(idev, ABS_PRESSURE, 0, ts->p_max, ts->fudge_p, 0);
+
+	tsc2005_start_scan(ts);
+
+	r = request_irq(ts->spi->irq, tsc2005_ts_irq_handler,
+			(((TSC2005_CFR2_INITVALUE & TSC2005_CFR2_IRQ_MASK) ==
+			  TSC2005_CFR2_IRQ_PENDAV)
+			 ? IRQF_TRIGGER_RISING
+			 : IRQF_TRIGGER_FALLING) |
+			IRQF_DISABLED, "tsc2005", ts);
+	if (r < 0) {
+		dev_err(&ts->spi->dev, "unable to get DAV IRQ");
+		goto err2;
+	}
+
+	set_irq_wake(ts->spi->irq, 1);
+
+	r = input_register_device(idev);
+	if (r < 0) {
+		dev_err(&ts->spi->dev, "can't register touchscreen device\n");
+		goto err3;
+	}
+
+	/* We can tolerate these failing */
+	r = device_create_file(&ts->spi->dev, &dev_attr_ts_ctrl_selftest);
+	if (r < 0)
+		dev_warn(&ts->spi->dev, "can't create sysfs file for %s: %d\n",
+			 dev_attr_ts_ctrl_selftest.attr.name, r);
+
+	r = device_create_file(&ts->spi->dev, &dev_attr_pen_down);
+	if (r < 0)
+		dev_warn(&ts->spi->dev, "can't create sysfs file for %s: %d\n",
+			 dev_attr_pen_down.attr.name, r);
+
+	r = device_create_file(&ts->spi->dev, &dev_attr_disable_ts);
+	if (r < 0)
+		dev_warn(&ts->spi->dev, "can't create sysfs file for %s: %d\n",
+			 dev_attr_disable_ts.attr.name, r);
+
+	/* Finally, configure and start the optional EDD watchdog. */
+	ts->esd_timeout = pdata->esd_timeout;
+	if (ts->esd_timeout && ts->set_reset) {
+		unsigned long wdj;
+		setup_timer(&ts->esd_timer, tsc2005_esd_timer_handler,
+			    (unsigned long)ts);
+		INIT_WORK(&ts->esd_work, tsc2005_rst_handler);
+		wdj = msecs_to_jiffies(ts->esd_timeout);
+		ts->esd_timer.expires = round_jiffies(jiffies+wdj);
+		add_timer(&ts->esd_timer);
+	}
+
+	return 0;
+err3:
+	free_irq(ts->spi->irq, ts);
+err2:
+	tsc2005_stop_scan(ts);
+	input_free_device(idev);
+err1:
+	return r;
+}
+
+static int __devinit tsc2005_probe(struct spi_device *spi)
+{
+	struct tsc2005			*ts;
+	struct tsc2005_platform_data	*pdata = spi->dev.platform_data;
+	int r;
+
+	if (spi->irq < 0) {
+		dev_dbg(&spi->dev, "no irq?\n");
+		return -ENODEV;
+	}
+	if (!pdata) {
+		dev_dbg(&spi->dev, "no platform data?\n");
+		return -ENODEV;
+	}
+
+	ts = kzalloc(sizeof(*ts), GFP_KERNEL);
+	if (ts == NULL)
+		return -ENOMEM;
+
+	dev_set_drvdata(&spi->dev, ts);
+	ts->spi = spi;
+	spi->dev.power.power_state = PMSG_ON;
+
+	spi->mode = SPI_MODE_0;
+	spi->bits_per_word = 8;
+	/* The max speed might've been defined by the board-specific
+	 * struct */
+	if (!spi->max_speed_hz)
+		spi->max_speed_hz = TSC2005_HZ;
+
+	spi_setup(spi);
+
+	r = tsc2005_ts_init(ts, pdata);
+	if (r)
+		goto err1;
+
+	return 0;
+
+err1:
+	kfree(ts);
+	return r;
+}
+
+static int __devexit tsc2005_remove(struct spi_device *spi)
+{
+	struct tsc2005 *ts = dev_get_drvdata(&spi->dev);
+
+	mutex_lock(&ts->mutex);
+	tsc2005_disable(ts);
+	mutex_unlock(&ts->mutex);
+
+	device_remove_file(&ts->spi->dev, &dev_attr_disable_ts);
+	device_remove_file(&ts->spi->dev, &dev_attr_pen_down);
+	device_remove_file(&ts->spi->dev, &dev_attr_ts_ctrl_selftest);
+
+	free_irq(ts->spi->irq, ts);
+	input_unregister_device(ts->idev);
+
+	if (ts->esd_timeout)
+		del_timer(&ts->esd_timer);
+	kfree(ts);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int tsc2005_suspend(struct spi_device *spi, pm_message_t mesg)
+{
+	struct tsc2005 *ts = dev_get_drvdata(&spi->dev);
+
+	mutex_lock(&ts->mutex);
+	tsc2005_disable(ts);
+	mutex_unlock(&ts->mutex);
+
+	return 0;
+}
+
+static int tsc2005_resume(struct spi_device *spi)
+{
+	struct tsc2005 *ts = dev_get_drvdata(&spi->dev);
+
+	mutex_lock(&ts->mutex);
+	tsc2005_enable(ts);
+	mutex_unlock(&ts->mutex);
+
+	return 0;
+}
+#endif
+
+static struct spi_driver tsc2005_driver = {
+	.driver = {
+		.name = "tsc2005",
+		.owner = THIS_MODULE,
+	},
+#ifdef CONFIG_PM
+	.suspend = tsc2005_suspend,
+	.resume = tsc2005_resume,
+#endif
+	.probe = tsc2005_probe,
+	.remove = __devexit_p(tsc2005_remove),
+};
+
+static int __init tsc2005_init(void)
+{
+	printk(KERN_INFO "TSC2005 driver initializing\n");
+
+	return spi_register_driver(&tsc2005_driver);
+}
+module_init(tsc2005_init);
+
+static void __exit tsc2005_exit(void)
+{
+	spi_unregister_driver(&tsc2005_driver);
+}
+module_exit(tsc2005_exit);
+
+MODULE_AUTHOR("Lauri Leukkunen ");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:tsc2005");
diff --git a/include/linux/spi/tsc2005.h b/include/linux/spi/tsc2005.h
new file mode 100644
index 0000000..1a60c90
--- /dev/null
+++ b/include/linux/spi/tsc2005.h
@@ -0,0 +1,30 @@
+#ifndef _LINUX_SPI_TSC2005_H
+#define _LINUX_SPI_TSC2005_H
+
+#include 
+
+struct tsc2005_platform_data {
+	u16	ts_x_plate_ohm;
+	u32	ts_stab_time;	/* voltage settling time */
+	u8	ts_hw_avg;	/* HW assiseted averaging. Can be
+				   0, 4, 8, 16 samples per reading */
+	u32	ts_touch_pressure;	/* Pressure limit until we report a
+					   touch event. After that we switch
+					   to ts_max_pressure. */
+	u32	ts_pressure_max;/* Samples with bigger pressure value will
+				   be ignored, since the corresponding X, Y
+				   values are unreliable */
+	u32	ts_pressure_fudge;
+	u32	ts_x_max;
+	u32	ts_x_fudge;
+	u32	ts_y_max;
+	u32	ts_y_fudge;
+
+	u32	esd_timeout;    /* msec of inactivity before we check */
+
+	unsigned ts_ignore_last:1;
+
+	void (*set_reset)(bool enable);
+};
+
+#endif
-- 
1.6.0.4
 
CD: 4ms