Input: tsc2005 - convert to using dev_pm_ops

[linux-2.6/kvm.git] / drivers / input / touchscreen / tsc2005.c

/*
 * 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/pm.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 spi_device *spi = to_spi_device(dev);
        struct tsc2005 *ts = spi_get_drvdata(spi);

        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 spi_device *spi = to_spi_device(dev);
        struct tsc2005 *ts = spi_get_drvdata(spi);
        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 spi_device *spi = to_spi_device(dev);
        struct tsc2005 *ts = spi_get_drvdata(spi);
        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;

        spi_set_drvdata(spi, 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 = spi_get_drvdata(spi);

        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_SLEEP
static int tsc2005_suspend(struct device *dev)
{
        struct spi_device *spi = to_spi_device(dev);
        struct tsc2005 *ts = spi_get_drvdata(spi);

        mutex_lock(&ts->mutex);
        tsc2005_disable(ts);
        mutex_unlock(&ts->mutex);

        return 0;
}

static int tsc2005_resume(struct device *dev)
{
        struct spi_device *spi = to_spi_device(dev);
        struct tsc2005 *ts = spi_get_drvdata(spi);

        mutex_lock(&ts->mutex);
        tsc2005_enable(ts);
        mutex_unlock(&ts->mutex);

        return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(tsc2005_pm_ops, tsc2005_suspend, tsc2005_resume);

static struct spi_driver tsc2005_driver = {
        .driver = {
                .name   = "tsc2005",
                .owner  = THIS_MODULE,
                .pm     = &tsc2005_pm_ops,
        },
        .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");