Input: introduce tsc2005 driver

Discussions:

http://www.mail-archive.com/linux-omap@vger.kernel.org/msg26748.html

Introduce a driver for the Texas Instruments TSC2005 touchscreen
controller (http://focus.ti.com/docs/prod/folders/print/tsc2005.html).

The patch is based on a driver by Lauri Leukkunen, with 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@nokia.com>
[aaro.koskinen@nokia.com: patch description, rebasing & cleanup]
Signed-off-by: Aaro Koskinen <aaro.koskinen@nokia.com>
[ext-srikar.1.bhavanarayana@nokia.com: various fixes]
Signed-off-by: Srikar <ext-srikar.1.bhavanarayana@nokia.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

3 files changed, 725 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 06ea8da95c62..30703ad363f3 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -629,6 +629,17 @@ 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 7cc1b4f4b677..34b26ad65cee 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -44,6 +44,7 @@ obj-$(CONFIG_TOUCHSCREEN_TNETV107X)	+= tnetv107x-ts.o
 obj-$(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 000000000000..f95f968f18e1
--- /dev/null
+++ b/drivers/input/touchscreen/tsc2005.c
@@ -0,0 +1,713 @@
+/*
+ * TSC2005 touchscreen driver
+ *
+ * Copyright (C) 2006-2010 Nokia Corporation
+ *
+ * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
+ * based on TSC2301 driver by Klaus K. Pedersen <klaus.k.pedersen@nokia.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:
+ *
+ * 1) Pen is pressed against the touchscreen.
+ * 2) TSC2005 performs AD conversion.
+ * 3) After the conversion is done TSC2005 drives DAV line down.
+ * 4) GPIO IRQ is received and tsc2005_irq_thread() is scheduled.
+ * 5) tsc2005_irq_thread() queues up an spi transfer to fetch the x, y, z1, z2
+ *    values.
+ * 6) tsc2005_irq_thread() reports coordinates to input layer and sets up
+ *    tsc2005_penup_timer() to be called after TSC2005_PENUP_TIME_MS (40ms).
+ * 7) When the penup timer expires, there have not been touch or DAV interrupts
+ *    during the last 40ms which means the pen has been lifted.
+ *
+ * ESD recovery via a hardware reset is done if the TSC2005 doesn't respond
+ * after a configurable period (in ms) of activity. If esd_timeout is 0, the
+ * watchdog is disabled.
+ */
+
+/* control byte 1 */
+#define TSC2005_CMD                     0x80
+#define TSC2005_CMD_NORMAL              0x00
+#define TSC2005_CMD_STOP                0x01
+#define TSC2005_CMD_12BIT               0x04
+
+/* control byte 0 */
+#define TSC2005_REG_READ                0x0001
+#define TSC2005_REG_PND0                0x0002
+#define TSC2005_REG_X                   0x0000
+#define TSC2005_REG_Y                   0x0008
+#define TSC2005_REG_Z1                  0x0010
+#define TSC2005_REG_Z2                  0x0018
+#define TSC2005_REG_TEMP_HIGH           0x0050
+#define TSC2005_REG_CFR0                0x0060
+#define TSC2005_REG_CFR1                0x0068
+#define TSC2005_REG_CFR2                0x0070
+
+/* configuration register 0 */
+#define TSC2005_CFR0_PRECHARGE_276US    0x0040
+#define TSC2005_CFR0_STABTIME_1MS       0x0300
+#define TSC2005_CFR0_CLOCK_1MHZ         0x1000
+#define TSC2005_CFR0_RESOLUTION12       0x2000
+#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 configuration register 0 */
+#define TSC2005_CFR0_RW_MASK            0x3fff
+
+/* configuration register 1 */
+#define TSC2005_CFR1_BATCHDELAY_4MS     0x0003
+#define TSC2005_CFR1_INITVALUE          TSC2005_CFR1_BATCHDELAY_4MS
+
+/* configuration register 2 */
+#define TSC2005_CFR2_MAVE_Z             0x0004
+#define TSC2005_CFR2_MAVE_Y             0x0008
+#define TSC2005_CFR2_MAVE_X             0x0010
+#define TSC2005_CFR2_AVG_7              0x0800
+#define TSC2005_CFR2_MEDIUM_15          0x3000
+#define TSC2005_CFR2_INITVALUE          (TSC2005_CFR2_MAVE_X    | \
+                                         TSC2005_CFR2_MAVE_Y    | \
+                                         TSC2005_CFR2_MAVE_Z    | \
+                                         TSC2005_CFR2_MEDIUM_15 | \
+                                         TSC2005_CFR2_AVG_7)
+
+#define MAX_12BIT                       0xfff
+#define TSC2005_SPI_MAX_SPEED_HZ        10000000
+#define TSC2005_PENUP_TIME_MS           40
+
+struct tsc2005_spi_rd {
+        struct spi_transfer     spi_xfer;
+        u32                     spi_tx;
+        u32                     spi_rx;
+};
+
+struct tsc2005 {
+        struct spi_device       *spi;
+
+        struct spi_message      spi_read_msg;
+        struct tsc2005_spi_rd   spi_x;
+        struct tsc2005_spi_rd   spi_y;
+        struct tsc2005_spi_rd   spi_z1;
+        struct tsc2005_spi_rd   spi_z2;
+
+        struct input_dev        *idev;
+        char                    phys[32];
+
+        struct mutex            mutex;
+
+        /* raw copy of previous x,y,z */
+        int                     in_x;
+        int                     in_y;
+        int                     in_z1;
+        int                     in_z2;
+
+        struct timer_list       penup_timer;
+        struct work_struct      penup_work;
+
+        unsigned int            esd_timeout;
+        struct timer_list       esd_timer;
+        struct work_struct      esd_work;
+
+        unsigned int            x_plate_ohm;
+
+        bool                    disabled;
+        unsigned int            disable_depth;
+        unsigned int            pen_down;
+
+        void                    (*set_reset)(bool enable);
+};
+
+static void tsc2005_cmd(struct tsc2005 *ts, u8 cmd)
+{
+        u8 tx;
+        struct spi_message msg;
+        struct spi_transfer xfer = { 0 };
+
+        tx = TSC2005_CMD | TSC2005_CMD_12BIT | cmd;
+
+        xfer.tx_buf = &tx;
+        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 = (reg | TSC2005_REG_PND0) << 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_setup_read(struct tsc2005_spi_rd *rd, u8 reg, bool last)
+{
+        rd->spi_tx                 = (reg | TSC2005_REG_READ) << 16;
+        rd->spi_xfer.tx_buf        = &rd->spi_tx;
+        rd->spi_xfer.rx_buf        = &rd->spi_rx;
+        rd->spi_xfer.len           = 4;
+        rd->spi_xfer.bits_per_word = 24;
+        rd->spi_xfer.cs_change     = !last;
+}
+
+static void tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value)
+{
+        struct spi_message msg;
+        struct tsc2005_spi_rd spi_rd = { { 0 }, 0, 0 };
+
+        tsc2005_setup_read(&spi_rd, reg, 1);
+
+        spi_message_init(&msg);
+        spi_message_add_tail(&spi_rd.spi_xfer, &msg);
+        spi_sync(ts->spi, &msg);
+        *value = spi_rd.spi_rx;
+}
+
+static void tsc2005_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, !!pressure);
+                        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);
+        dev_dbg(&ts->spi->dev, "point(%4d,%4d), pressure (%4d)\n", x, y,
+                pressure);
+}
+
+static irqreturn_t tsc2005_irq_handler(int irq, void *dev_id)
+{
+        struct tsc2005 *ts = dev_id;
+
+        /* update the penup timer only if it's pending */
+        mod_timer_pending(&ts->penup_timer,
+                          jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS));
+
+        return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t tsc2005_irq_thread(int irq, void *_ts)
+{
+        struct tsc2005 *ts = _ts;
+        unsigned int pressure;
+        u32 x;
+        u32 y;
+        u32 z1;
+        u32 z2;
+
+        mutex_lock(&ts->mutex);
+
+        if (unlikely(ts->disable_depth))
+                goto out;
+
+        /* read the coordinates */
+        spi_sync(ts->spi, &ts->spi_read_msg);
+        x = ts->spi_x.spi_rx;
+        y = ts->spi_y.spi_rx;
+        z1 = ts->spi_z1.spi_rx;
+        z2 = ts->spi_z2.spi_rx;
+
+        /* validate position */
+        if (unlikely(x > MAX_12BIT || y > MAX_12BIT))
+                goto out;
+
+        /* skip coords if the pressure components are out of range */
+        if (unlikely(z1 == 0 || 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;
+
+        /* compute touch pressure resistance using equation #1 */
+        pressure = x * (z2 - z1) / z1;
+        pressure = pressure * ts->x_plate_ohm / 4096;
+        if (unlikely(pressure > MAX_12BIT))
+                goto out;
+
+        tsc2005_update_pen_state(ts, x, y, pressure);
+
+        /* set the penup timer */
+        mod_timer(&ts->penup_timer,
+                  jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS));
+
+        if (!ts->esd_timeout)
+                goto out;
+
+        /* update the watchdog timer */
+        mod_timer(&ts->esd_timer,
+                  round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout)));
+
+out:
+        mutex_unlock(&ts->mutex);
+        return IRQ_HANDLED;
+}
+
+static void tsc2005_penup_timer(unsigned long data)
+{
+        struct tsc2005 *ts = (struct tsc2005 *)data;
+
+        schedule_work(&ts->penup_work);
+}
+
+static void tsc2005_penup_work(struct work_struct *work)
+{
+        struct tsc2005 *ts = container_of(work, struct tsc2005, penup_work);
+
+        mutex_lock(&ts->mutex);
+        tsc2005_update_pen_state(ts, 0, 0, 0);
+        mutex_unlock(&ts->mutex);
+}
+
+static void tsc2005_start_scan(struct tsc2005 *ts)
+{
+        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, TSC2005_CMD_NORMAL);
+}
+
+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_sync(&ts->esd_timer);
+        del_timer_sync(&ts->penup_timer);
+        tsc2005_stop_scan(ts);
+}
+
+/* must be called with mutex held */
+static void tsc2005_enable(struct tsc2005 *ts)
+{
+        if (--ts->disable_depth != 0)
+                return;
+        tsc2005_start_scan(ts);
+        enable_irq(ts->spi->irq);
+        if (!ts->esd_timeout)
+                return;
+        mod_timer(&ts->esd_timer,
+                  round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout)));
+}
+
+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, 0664, tsc2005_disable_show, tsc2005_disable_store);
+
+static ssize_t tsc2005_selftest_show(struct device *dev,
+                                     struct device_attribute *attr,
+                                     char *buf)
+{
+        struct tsc2005 *ts = dev_get_drvdata(dev);
+        u16 temp_high;
+        u16 temp_high_orig;
+        u16 temp_high_test;
+        unsigned int result;
+
+        if (!ts->set_reset) {
+                dev_warn(&ts->spi->dev,
+                         "unable to selftest: no reset function\n");
+                result = 0;
+                goto out;
+        }
+
+        mutex_lock(&ts->mutex);
+
+        /*
+         * Test TSC2005 communications via temp high register.
+         */
+        tsc2005_disable(ts);
+        result = 1;
+        tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig);
+        temp_high_test = (temp_high_orig - 1) & MAX_12BIT;
+        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) {
+                dev_warn(dev, "selftest failed: %d != %d\n",
+                         temp_high, temp_high_test);
+                result = 0;
+        }
+
+        /* hardware reset */
+        ts->set_reset(0);
+        usleep_range(100, 500); /* only 10us required */
+        ts->set_reset(1);
+        tsc2005_enable(ts);
+
+        /* test that the reset really happened */
+        tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
+        if (temp_high != temp_high_orig) {
+                dev_warn(dev, "selftest failed after reset: %d != %d\n",
+                         temp_high, temp_high_orig);
+                result = 0;
+        }
+
+        mutex_unlock(&ts->mutex);
+
+out:
+        return sprintf(buf, "%u\n", result);
+}
+static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL);
+
+static void tsc2005_esd_timer(unsigned long data)
+{
+        struct tsc2005 *ts = (struct tsc2005 *)data;
+
+        schedule_work(&ts->esd_work);
+}
+
+static void tsc2005_esd_work(struct work_struct *work)
+{
+        struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work);
+        u16 r;
+
+        mutex_lock(&ts->mutex);
+
+        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.
+         */
+        tsc2005_read(ts, TSC2005_REG_CFR0, &r);
+        if ((r ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK) {
+                dev_info(&ts->spi->dev, "TSC2005 not responding - resetting\n");
+                ts->set_reset(0);
+                tsc2005_update_pen_state(ts, 0, 0, 0);
+                usleep_range(100, 500); /* only 10us required */
+                ts->set_reset(1);
+                tsc2005_start_scan(ts);
+        }
+
+        /* re-arm the watchdog */
+        mod_timer(&ts->esd_timer,
+                  round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout)));
+
+out:
+        mutex_unlock(&ts->mutex);
+}
+
+static void __devinit tsc2005_setup_spi_xfer(struct tsc2005 *ts)
+{
+        tsc2005_setup_read(&ts->spi_x, TSC2005_REG_X, 0);
+        tsc2005_setup_read(&ts->spi_y, TSC2005_REG_Y, 0);
+        tsc2005_setup_read(&ts->spi_z1, TSC2005_REG_Z1, 0);
+        tsc2005_setup_read(&ts->spi_z2, TSC2005_REG_Z2, 1);
+
+        spi_message_init(&ts->spi_read_msg);
+        spi_message_add_tail(&ts->spi_x.spi_xfer, &ts->spi_read_msg);
+        spi_message_add_tail(&ts->spi_y.spi_xfer, &ts->spi_read_msg);
+        spi_message_add_tail(&ts->spi_z1.spi_xfer, &ts->spi_read_msg);
+        spi_message_add_tail(&ts->spi_z2.spi_xfer, &ts->spi_read_msg);
+}
+
+static struct attribute *tsc2005_attrs[] = {
+        &dev_attr_disable.attr,
+        &dev_attr_selftest.attr,
+        NULL
+};
+
+static struct attribute_group tsc2005_attr_group = {
+        .attrs = tsc2005_attrs,
+};
+
+static int __devinit tsc2005_setup(struct tsc2005 *ts,
+                                   struct tsc2005_platform_data *pdata)
+{
+        int r;
+        int fudge_x;
+        int fudge_y;
+        int fudge_p;
+        int p_max;
+        int x_max;
+        int y_max;
+
+        mutex_init(&ts->mutex);
+
+        tsc2005_setup_spi_xfer(ts);
+
+        init_timer(&ts->penup_timer);
+        setup_timer(&ts->penup_timer, tsc2005_penup_timer, (unsigned long)ts);
+        INIT_WORK(&ts->penup_work, tsc2005_penup_work);
+
+        fudge_x         = pdata->ts_x_fudge        ? : 4;
+        fudge_y         = pdata->ts_y_fudge        ? : 8;
+        fudge_p         = pdata->ts_pressure_fudge ? : 2;
+        x_max           = pdata->ts_x_max          ? : MAX_12BIT;
+        y_max           = pdata->ts_y_max          ? : MAX_12BIT;
+        p_max           = pdata->ts_pressure_max   ? : MAX_12BIT;
+        ts->x_plate_ohm = pdata->ts_x_plate_ohm    ? : 280;
+        ts->esd_timeout = pdata->esd_timeout_ms;
+        ts->set_reset   = pdata->set_reset;
+
+        ts->idev = input_allocate_device();
+        if (ts->idev == NULL)
+                return -ENOMEM;
+        ts->idev->name = "TSC2005 touchscreen";
+        snprintf(ts->phys, sizeof(ts->phys), "%s/input-ts",
+                 dev_name(&ts->spi->dev));
+        ts->idev->phys = ts->phys;
+        ts->idev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
+        ts->idev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE);
+        ts->idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+
+        input_set_abs_params(ts->idev, ABS_X, 0, x_max, fudge_x, 0);
+        input_set_abs_params(ts->idev, ABS_Y, 0, y_max, fudge_y, 0);
+        input_set_abs_params(ts->idev, ABS_PRESSURE, 0, p_max, fudge_p, 0);
+
+        r = request_threaded_irq(ts->spi->irq, tsc2005_irq_handler,
+                                 tsc2005_irq_thread, IRQF_TRIGGER_RISING,
+                                 "tsc2005", ts);
+        if (r) {
+                dev_err(&ts->spi->dev, "request_threaded_irq(): %d\n", r);
+                goto err1;
+        }
+        set_irq_wake(ts->spi->irq, 1);
+
+        r = input_register_device(ts->idev);
+        if (r) {
+                dev_err(&ts->spi->dev, "input_register_device(): %d\n", r);
+                goto err2;
+        }
+
+        r = sysfs_create_group(&ts->spi->dev.kobj, &tsc2005_attr_group);
+        if (r)
+                dev_warn(&ts->spi->dev, "sysfs entry creation failed: %d\n", r);
+
+        tsc2005_start_scan(ts);
+
+        if (!ts->esd_timeout || !ts->set_reset)
+                goto done;
+
+        /* start the optional ESD watchdog */
+        setup_timer(&ts->esd_timer, tsc2005_esd_timer, (unsigned long)ts);
+        INIT_WORK(&ts->esd_work, tsc2005_esd_work);
+        mod_timer(&ts->esd_timer,
+                  round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout)));
+
+done:
+        return 0;
+
+err2:
+        free_irq(ts->spi->irq, ts);
+
+err1:
+        input_free_device(ts->idev);
+        return r;
+}
+
+static int __devinit tsc2005_probe(struct spi_device *spi)
+{
+        struct tsc2005_platform_data *pdata = spi->dev.platform_data;
+        struct tsc2005 *ts;
+        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;
+        if (!spi->max_speed_hz)
+                spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ;
+        spi_setup(spi);
+
+        r = tsc2005_setup(ts, pdata);
+        if (r)
+                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);
+
+        if (ts->esd_timeout)
+                del_timer_sync(&ts->esd_timer);
+        del_timer_sync(&ts->penup_timer);
+
+        flush_work(&ts->esd_work);
+        flush_work(&ts->penup_work);
+
+        sysfs_remove_group(&ts->spi->dev.kobj, &tsc2005_attr_group);
+        free_irq(ts->spi->irq, ts);
+        input_unregister_device(ts->idev);
+        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@nokia.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:tsc2005");