Message-Id: <1257340982-22814-1-git-send-email-aaro.koskinen@nokia.com>
Date:	Wed,  4 Nov 2009 15:23:01 +0200
From:	Aaro Koskinen <aaro.koskinen@...ia.com>
To:	linux-input@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, dmitry.torokhov@...il.com,
	tony@...mide.com
Cc:	Lauri Leukkunen <lauri.leukkunen@...ia.com>,
	Aaro Koskinen <aaro.koskinen@...ia.com>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Phil Carmody <ext-phil.2.carmody@...ia.com>,
	Imre Deak <imre.deak@...ia.com>,
	Hiroshi DOYU <Hiroshi.DOYU@...ia.com>,
	Ari Kauppi <Ext-Ari.Kauppi@...ia.com>,
	Jarkko Nikula <jhnikula@...il.com>,
	Eero Nurkkala <ext-eero.nurkkala@...ia.com>,
	Roman Tereshonkov <roman.tereshonkov@...ia.com>
Subject: [PATCH v2 1/2] input: touchscreen: introduce tsc2005 driver

From: Lauri Leukkunen <lauri.leukkunen@...ia.com>

Introduce a driver for the Texas Instruments TSC2005 touchscreen
controller.

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 <lauri.leukkunen@...ia.com>
[aaro.koskinen@...ia.com: patch description, rebasing & cleanup]
Signed-off-by: Aaro Koskinen <aaro.koskinen@...ia.com>
CC: David Brownell <dbrownell@...rs.sourceforge.net>
CC: Phil Carmody <ext-phil.2.carmody@...ia.com>
CC: Imre Deak <imre.deak@...ia.com>
CC: Hiroshi DOYU <Hiroshi.DOYU@...ia.com>
CC: Ari Kauppi <Ext-Ari.Kauppi@...ia.com>
CC: Tony Lindgren <tony@...mide.com>
CC: Jarkko Nikula <jhnikula@...il.com>
CC: Eero Nurkkala <ext-eero.nurkkala@...ia.com>
CC: Roman Tereshonkov <roman.tereshonkov@...ia.com>
---

The patch is for 2.6.32-rc6.

v2:
	- Move RX-51 specific stuff to a separate patch
	- Change year in the comments

 drivers/input/touchscreen/Kconfig   |   11 +
 drivers/input/touchscreen/Makefile  |    1 +
 drivers/input/touchscreen/tsc2005.c |  958 +++++++++++++++++++++++++++++++++++
 include/linux/spi/tsc2005.h         |   30 ++
 4 files changed, 1000 insertions(+), 0 deletions(-)
 create mode 100644 drivers/input/touchscreen/tsc2005.c
 create mode 100644 include/linux/spi/tsc2005.h

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) 2006-2009 Nokia Corporation
+ *
+ * Author: Lauri Leukkunen <lauri.leukkunen@...ia.com>
+ * based on TSC2301 driver by Klaus K. Pedersen <klaus.k.pedersen@...ia.com>
+ *
+ * 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 <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/spi/spi.h>
+
+#include <linux/spi/tsc2005.h>
+
+/**
+ * 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 = &rx;
+	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, &reg_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 <lauri.leukkunen@...ia.com>");
+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 <linux/types.h>
+
+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

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