Input: add Philips UCB1400 touchscreen driver
Nicolas Pitre [Fri, 17 Nov 2006 06:07:26 +0000 (01:07 -0500)]
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/touchscreen/Kconfig
drivers/input/touchscreen/Makefile
drivers/input/touchscreen/ucb1400_ts.c [new file with mode: 0644]

index 9418bbe..29ca0ab 100644 (file)
@@ -144,4 +144,19 @@ config TOUCHSCREEN_TOUCHWIN
          To compile this driver as a module, choose M here: the
          module will be called touchwin.
 
+config TOUCHSCREEN_UCB1400
+       tristate "Philips UCB1400 touchscreen"
+       select SND_AC97_BUS
+       help
+         This enables support for the Philips UCB1400 touchscreen interface.
+         The UCB1400 is an AC97 audio codec.  The touchscreen interface
+         will be initialized only after the ALSA subsystem has been
+         brought up and the UCB1400 detected.  You therefore have to
+         configure ALSA support as well (either built-in or modular,
+         independently of whether this driver is itself built-in or
+         modular) for this driver to work.
+
+         To compile this driver as a module, choose M here: the
+         module will be called ucb1400_ts.
+
 endif
index 1abb8f1..30e6e22 100644 (file)
@@ -15,3 +15,4 @@ obj-$(CONFIG_TOUCHSCREEN_HP600)       += hp680_ts_input.o
 obj-$(CONFIG_TOUCHSCREEN_PENMOUNT)     += penmount.o
 obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT)   += touchright.o
 obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN)     += touchwin.o
+obj-$(CONFIG_TOUCHSCREEN_UCB1400)      += ucb1400_ts.o
diff --git a/drivers/input/touchscreen/ucb1400_ts.c b/drivers/input/touchscreen/ucb1400_ts.c
new file mode 100644 (file)
index 0000000..6ef0836
--- /dev/null
@@ -0,0 +1,579 @@
+/*
+ *  Philips UCB1400 touchscreen driver
+ *
+ *  Author:    Nicolas Pitre
+ *  Created:   September 25, 2006
+ *  Copyright: MontaVista Software, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This code is heavily based on ucb1x00-*.c copyrighted by Russell King
+ * covering the UCB1100, UCB1200 and UCB1300..  Support for the UCB1400 has
+ * been made separate from ucb1x00-core/ucb1x00-ts on Russell's request.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/input.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/suspend.h>
+#include <linux/slab.h>
+#include <linux/kthread.h>
+
+#include <sound/driver.h>
+#include <sound/core.h>
+#include <sound/ac97_codec.h>
+
+
+/*
+ * Interesting UCB1400 AC-link registers
+ */
+
+#define UCB_IE_RIS             0x5e
+#define UCB_IE_FAL             0x60
+#define UCB_IE_STATUS          0x62
+#define UCB_IE_CLEAR           0x62
+#define UCB_IE_ADC             (1 << 11)
+#define UCB_IE_TSPX            (1 << 12)
+
+#define UCB_TS_CR              0x64
+#define UCB_TS_CR_TSMX_POW     (1 << 0)
+#define UCB_TS_CR_TSPX_POW     (1 << 1)
+#define UCB_TS_CR_TSMY_POW     (1 << 2)
+#define UCB_TS_CR_TSPY_POW     (1 << 3)
+#define UCB_TS_CR_TSMX_GND     (1 << 4)
+#define UCB_TS_CR_TSPX_GND     (1 << 5)
+#define UCB_TS_CR_TSMY_GND     (1 << 6)
+#define UCB_TS_CR_TSPY_GND     (1 << 7)
+#define UCB_TS_CR_MODE_INT     (0 << 8)
+#define UCB_TS_CR_MODE_PRES    (1 << 8)
+#define UCB_TS_CR_MODE_POS     (2 << 8)
+#define UCB_TS_CR_BIAS_ENA     (1 << 11)
+#define UCB_TS_CR_TSPX_LOW     (1 << 12)
+#define UCB_TS_CR_TSMX_LOW     (1 << 13)
+
+#define UCB_ADC_CR             0x66
+#define UCB_ADC_SYNC_ENA       (1 << 0)
+#define UCB_ADC_VREFBYP_CON    (1 << 1)
+#define UCB_ADC_INP_TSPX       (0 << 2)
+#define UCB_ADC_INP_TSMX       (1 << 2)
+#define UCB_ADC_INP_TSPY       (2 << 2)
+#define UCB_ADC_INP_TSMY       (3 << 2)
+#define UCB_ADC_INP_AD0                (4 << 2)
+#define UCB_ADC_INP_AD1                (5 << 2)
+#define UCB_ADC_INP_AD2                (6 << 2)
+#define UCB_ADC_INP_AD3                (7 << 2)
+#define UCB_ADC_EXT_REF                (1 << 5)
+#define UCB_ADC_START          (1 << 7)
+#define UCB_ADC_ENA            (1 << 15)
+
+#define UCB_ADC_DATA           0x68
+#define UCB_ADC_DAT_VALID      (1 << 15)
+#define UCB_ADC_DAT_VALUE(x)   ((x) & 0x3ff)
+
+#define UCB_ID                 0x7e
+#define UCB_ID_1400             0x4304
+
+
+struct ucb1400 {
+       ac97_t                  *ac97;
+       struct input_dev        *ts_idev;
+
+       int                     irq;
+
+       wait_queue_head_t       ts_wait;
+       struct task_struct      *ts_task;
+
+       unsigned int            irq_pending;    /* not bit field shared */
+       unsigned int            ts_restart:1;
+       unsigned int            adcsync:1;
+};
+
+static int adcsync;
+
+static inline u16 ucb1400_reg_read(struct ucb1400 *ucb, u16 reg)
+{
+       return ucb->ac97->bus->ops->read(ucb->ac97, reg);
+}
+
+static inline void ucb1400_reg_write(struct ucb1400 *ucb, u16 reg, u16 val)
+{
+       ucb->ac97->bus->ops->write(ucb->ac97, reg, val);
+}
+
+static inline void ucb1400_adc_enable(struct ucb1400 *ucb)
+{
+       ucb1400_reg_write(ucb, UCB_ADC_CR, UCB_ADC_ENA);
+}
+
+static unsigned int ucb1400_adc_read(struct ucb1400 *ucb, u16 adc_channel)
+{
+       unsigned int val;
+
+       if (ucb->adcsync)
+               adc_channel |= UCB_ADC_SYNC_ENA;
+
+       ucb1400_reg_write(ucb, UCB_ADC_CR, UCB_ADC_ENA | adc_channel);
+       ucb1400_reg_write(ucb, UCB_ADC_CR, UCB_ADC_ENA | adc_channel | UCB_ADC_START);
+
+       for (;;) {
+               val = ucb1400_reg_read(ucb, UCB_ADC_DATA);
+               if (val & UCB_ADC_DAT_VALID)
+                       break;
+               /* yield to other processes */
+               set_current_state(TASK_INTERRUPTIBLE);
+               schedule_timeout(1);
+       }
+
+       return UCB_ADC_DAT_VALUE(val);
+}
+
+static inline void ucb1400_adc_disable(struct ucb1400 *ucb)
+{
+       ucb1400_reg_write(ucb, UCB_ADC_CR, 0);
+}
+
+/* Switch to interrupt mode. */
+static inline void ucb1400_ts_mode_int(struct ucb1400 *ucb)
+{
+       ucb1400_reg_write(ucb, UCB_TS_CR,
+                       UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW |
+                       UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND |
+                       UCB_TS_CR_MODE_INT);
+}
+
+/*
+ * Switch to pressure mode, and read pressure.  We don't need to wait
+ * here, since both plates are being driven.
+ */
+static inline unsigned int ucb1400_ts_read_pressure(struct ucb1400 *ucb)
+{
+       ucb1400_reg_write(ucb, UCB_TS_CR,
+                       UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW |
+                       UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND |
+                       UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
+       return ucb1400_adc_read(ucb, UCB_ADC_INP_TSPY);
+}
+
+/*
+ * Switch to X position mode and measure Y plate.  We switch the plate
+ * configuration in pressure mode, then switch to position mode.  This
+ * gives a faster response time.  Even so, we need to wait about 55us
+ * for things to stabilise.
+ */
+static inline unsigned int ucb1400_ts_read_xpos(struct ucb1400 *ucb)
+{
+       ucb1400_reg_write(ucb, UCB_TS_CR,
+                       UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
+                       UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
+       ucb1400_reg_write(ucb, UCB_TS_CR,
+                       UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
+                       UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
+       ucb1400_reg_write(ucb, UCB_TS_CR,
+                       UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
+                       UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA);
+
+       udelay(55);
+
+       return ucb1400_adc_read(ucb, UCB_ADC_INP_TSPY);
+}
+
+/*
+ * Switch to Y position mode and measure X plate.  We switch the plate
+ * configuration in pressure mode, then switch to position mode.  This
+ * gives a faster response time.  Even so, we need to wait about 55us
+ * for things to stabilise.
+ */
+static inline unsigned int ucb1400_ts_read_ypos(struct ucb1400 *ucb)
+{
+       ucb1400_reg_write(ucb, UCB_TS_CR,
+                       UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
+                       UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
+       ucb1400_reg_write(ucb, UCB_TS_CR,
+                       UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
+                       UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
+       ucb1400_reg_write(ucb, UCB_TS_CR,
+                       UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
+                       UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA);
+
+       udelay(55);
+
+       return ucb1400_adc_read(ucb, UCB_ADC_INP_TSPX);
+}
+
+/*
+ * Switch to X plate resistance mode.  Set MX to ground, PX to
+ * supply.  Measure current.
+ */
+static inline unsigned int ucb1400_ts_read_xres(struct ucb1400 *ucb)
+{
+       ucb1400_reg_write(ucb, UCB_TS_CR,
+                       UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
+                       UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
+       return ucb1400_adc_read(ucb, 0);
+}
+
+/*
+ * Switch to Y plate resistance mode.  Set MY to ground, PY to
+ * supply.  Measure current.
+ */
+static inline unsigned int ucb1400_ts_read_yres(struct ucb1400 *ucb)
+{
+       ucb1400_reg_write(ucb, UCB_TS_CR,
+                       UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
+                       UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
+       return ucb1400_adc_read(ucb, 0);
+}
+
+static inline int ucb1400_ts_pen_down(struct ucb1400 *ucb)
+{
+       unsigned short val = ucb1400_reg_read(ucb, UCB_TS_CR);
+       return (val & (UCB_TS_CR_TSPX_LOW | UCB_TS_CR_TSMX_LOW));
+}
+
+static inline void ucb1400_ts_irq_enable(struct ucb1400 *ucb)
+{
+       ucb1400_reg_write(ucb, UCB_IE_CLEAR, UCB_IE_TSPX);
+       ucb1400_reg_write(ucb, UCB_IE_CLEAR, 0);
+       ucb1400_reg_write(ucb, UCB_IE_FAL, UCB_IE_TSPX);
+}
+
+static inline void ucb1400_ts_irq_disable(struct ucb1400 *ucb)
+{
+       ucb1400_reg_write(ucb, UCB_IE_FAL, 0);
+}
+
+static void ucb1400_ts_evt_add(struct input_dev *idev, u16 pressure, u16 x, u16 y)
+{
+       input_report_abs(idev, ABS_X, x);
+       input_report_abs(idev, ABS_Y, y);
+       input_report_abs(idev, ABS_PRESSURE, pressure);
+       input_sync(idev);
+}
+
+static void ucb1400_ts_event_release(struct input_dev *idev)
+{
+       input_report_abs(idev, ABS_PRESSURE, 0);
+       input_sync(idev);
+}
+
+static void ucb1400_handle_pending_irq(struct ucb1400 *ucb)
+{
+       unsigned int isr;
+
+       isr = ucb1400_reg_read(ucb, UCB_IE_STATUS);
+       ucb1400_reg_write(ucb, UCB_IE_CLEAR, isr);
+       ucb1400_reg_write(ucb, UCB_IE_CLEAR, 0);
+
+       if (isr & UCB_IE_TSPX)
+               ucb1400_ts_irq_disable(ucb);
+       else
+               printk(KERN_ERR "ucb1400: unexpected IE_STATUS = %#x\n", isr);
+
+       enable_irq(ucb->irq);
+}
+
+static int ucb1400_ts_thread(void *_ucb)
+{
+       struct ucb1400 *ucb = _ucb;
+       struct task_struct *tsk = current;
+       int valid = 0;
+
+       tsk->policy = SCHED_FIFO;
+       tsk->rt_priority = 1;
+
+       while (!kthread_should_stop()) {
+               unsigned int x, y, p;
+               long timeout;
+
+               ucb->ts_restart = 0;
+
+               if (ucb->irq_pending) {
+                       ucb->irq_pending = 0;
+                       ucb1400_handle_pending_irq(ucb);
+               }
+
+               ucb1400_adc_enable(ucb);
+               x = ucb1400_ts_read_xpos(ucb);
+               y = ucb1400_ts_read_ypos(ucb);
+               p = ucb1400_ts_read_pressure(ucb);
+               ucb1400_adc_disable(ucb);
+
+               /* Switch back to interrupt mode. */
+               ucb1400_ts_mode_int(ucb);
+
+               msleep(10);
+
+               if (ucb1400_ts_pen_down(ucb)) {
+                       ucb1400_ts_irq_enable(ucb);
+
+                       /*
+                        * If we spat out a valid sample set last time,
+                        * spit out a "pen off" sample here.
+                        */
+                       if (valid) {
+                               ucb1400_ts_event_release(ucb->ts_idev);
+                               valid = 0;
+                       }
+
+                       timeout = MAX_SCHEDULE_TIMEOUT;
+               } else {
+                       valid = 1;
+                       ucb1400_ts_evt_add(ucb->ts_idev, p, x, y);
+                       timeout = msecs_to_jiffies(10);
+               }
+
+               wait_event_interruptible_timeout(ucb->ts_wait,
+                       ucb->irq_pending || ucb->ts_restart || kthread_should_stop(),
+                       timeout);
+               try_to_freeze();
+       }
+
+       /* Send the "pen off" if we are stopping with the pen still active */
+       if (valid)
+               ucb1400_ts_event_release(ucb->ts_idev);
+
+       ucb->ts_task = NULL;
+       return 0;
+}
+
+/*
+ * A restriction with interrupts exists when using the ucb1400, as
+ * the codec read/write routines may sleep while waiting for codec
+ * access completion and uses semaphores for access control to the
+ * AC97 bus.  A complete codec read cycle could take  anywhere from
+ * 60 to 100uSec so we *definitely* don't want to spin inside the
+ * interrupt handler waiting for codec access.  So, we handle the
+ * interrupt by scheduling a RT kernel thread to run in process
+ * context instead of interrupt context.
+ */
+static irqreturn_t ucb1400_hard_irq(int irqnr, void *devid)
+{
+       struct ucb1400 *ucb = devid;
+
+       if (irqnr == ucb->irq) {
+               disable_irq(ucb->irq);
+               ucb->irq_pending = 1;
+               wake_up(&ucb->ts_wait);
+               return IRQ_HANDLED;
+       }
+       return IRQ_NONE;
+}
+
+static int ucb1400_ts_open(struct input_dev *idev)
+{
+       struct ucb1400 *ucb = idev->private;
+       int ret = 0;
+
+       BUG_ON(ucb->ts_task);
+
+       ucb->ts_task = kthread_run(ucb1400_ts_thread, ucb, "UCB1400_ts");
+       if (IS_ERR(ucb->ts_task)) {
+               ret = PTR_ERR(ucb->ts_task);
+               ucb->ts_task = NULL;
+       }
+
+       return ret;
+}
+
+static void ucb1400_ts_close(struct input_dev *idev)
+{
+       struct ucb1400 *ucb = idev->private;
+
+       if (ucb->ts_task)
+               kthread_stop(ucb->ts_task);
+
+       ucb1400_ts_irq_disable(ucb);
+       ucb1400_reg_write(ucb, UCB_TS_CR, 0);
+}
+
+#ifdef CONFIG_PM
+static int ucb1400_ts_resume(struct device *dev)
+{
+       struct ucb1400 *ucb = dev_get_drvdata(dev);
+
+       if (ucb->ts_task) {
+               /*
+                * Restart the TS thread to ensure the
+                * TS interrupt mode is set up again
+                * after sleep.
+                */
+               ucb->ts_restart = 1;
+               wake_up(&ucb->ts_wait);
+       }
+       return 0;
+}
+#else
+#define ucb1400_ts_resume NULL
+#endif
+
+#ifndef NO_IRQ
+#define NO_IRQ 0
+#endif
+
+/*
+ * Try to probe our interrupt, rather than relying on lots of
+ * hard-coded machine dependencies.
+ */
+static int ucb1400_detect_irq(struct ucb1400 *ucb)
+{
+       unsigned long mask, timeout;
+
+       mask = probe_irq_on();
+       if (!mask) {
+               probe_irq_off(mask);
+               return -EBUSY;
+       }
+
+       /* Enable the ADC interrupt. */
+       ucb1400_reg_write(ucb, UCB_IE_RIS, UCB_IE_ADC);
+       ucb1400_reg_write(ucb, UCB_IE_FAL, UCB_IE_ADC);
+       ucb1400_reg_write(ucb, UCB_IE_CLEAR, 0xffff);
+       ucb1400_reg_write(ucb, UCB_IE_CLEAR, 0);
+
+       /* Cause an ADC interrupt. */
+       ucb1400_reg_write(ucb, UCB_ADC_CR, UCB_ADC_ENA);
+       ucb1400_reg_write(ucb, UCB_ADC_CR, UCB_ADC_ENA | UCB_ADC_START);
+
+       /* Wait for the conversion to complete. */
+       timeout = jiffies + HZ/2;
+       while (!(ucb1400_reg_read(ucb, UCB_ADC_DATA) & UCB_ADC_DAT_VALID)) {
+               cpu_relax();
+               if (time_after(jiffies, timeout)) {
+                       printk(KERN_ERR "ucb1400: timed out in IRQ probe\n");
+                       probe_irq_off(mask);
+                       return -ENODEV;
+               }
+       }
+       ucb1400_reg_write(ucb, UCB_ADC_CR, 0);
+
+       /* Disable and clear interrupt. */
+       ucb1400_reg_write(ucb, UCB_IE_RIS, 0);
+       ucb1400_reg_write(ucb, UCB_IE_FAL, 0);
+       ucb1400_reg_write(ucb, UCB_IE_CLEAR, 0xffff);
+       ucb1400_reg_write(ucb, UCB_IE_CLEAR, 0);
+
+       /* Read triggered interrupt. */
+       ucb->irq = probe_irq_off(mask);
+       if (ucb->irq < 0 || ucb->irq == NO_IRQ)
+               return -ENODEV;
+
+       return 0;
+}
+
+static int ucb1400_ts_probe(struct device *dev)
+{
+       struct ucb1400 *ucb;
+       struct input_dev *idev;
+       int error, id, x_res, y_res;
+
+       ucb = kzalloc(sizeof(struct ucb1400), GFP_KERNEL);
+       idev = input_allocate_device();
+       if (!ucb || !idev) {
+               error = -ENOMEM;
+               goto err_free_devs;
+       }
+
+       ucb->ts_idev = idev;
+       ucb->adcsync = adcsync;
+       ucb->ac97 = to_ac97_t(dev);
+       init_waitqueue_head(&ucb->ts_wait);
+
+       id = ucb1400_reg_read(ucb, UCB_ID);
+       if (id != UCB_ID_1400) {
+               error = -ENODEV;
+               goto err_free_devs;
+       }
+
+       error = ucb1400_detect_irq(ucb);
+       if (error) {
+               printk(KERN_ERR "UCB1400: IRQ probe failed\n");
+               goto err_free_devs;
+       }
+
+       error = request_irq(ucb->irq, ucb1400_hard_irq, IRQF_TRIGGER_RISING,
+                               "UCB1400", ucb);
+       if (error) {
+               printk(KERN_ERR "ucb1400: unable to grab irq%d: %d\n",
+                               ucb->irq, error);
+               goto err_free_devs;
+       }
+       printk(KERN_DEBUG "UCB1400: found IRQ %d\n", ucb->irq);
+
+       idev->private           = ucb;
+       idev->cdev.dev          = dev;
+       idev->name              = "UCB1400 touchscreen interface";
+       idev->id.vendor         = ucb1400_reg_read(ucb, AC97_VENDOR_ID1);
+       idev->id.product        = id;
+       idev->open              = ucb1400_ts_open;
+       idev->close             = ucb1400_ts_close;
+       idev->evbit[0]          = BIT(EV_ABS);
+
+       ucb1400_adc_enable(ucb);
+       x_res = ucb1400_ts_read_xres(ucb);
+       y_res = ucb1400_ts_read_yres(ucb);
+       ucb1400_adc_disable(ucb);
+       printk(KERN_DEBUG "UCB1400: x/y = %d/%d\n", x_res, y_res);
+
+       input_set_abs_params(idev, ABS_X, 0, x_res, 0, 0);
+       input_set_abs_params(idev, ABS_Y, 0, y_res, 0, 0);
+       input_set_abs_params(idev, ABS_PRESSURE, 0, 0, 0, 0);
+
+       error = input_register_device(idev);
+       if (error)
+               goto err_free_irq;
+
+       dev_set_drvdata(dev, ucb);
+       return 0;
+
+ err_free_irq:
+       free_irq(ucb->irq, ucb);
+ err_free_devs:
+       input_free_device(idev);
+       kfree(ucb);
+       return error;
+}
+
+static int ucb1400_ts_remove(struct device *dev)
+{
+       struct ucb1400 *ucb = dev_get_drvdata(dev);
+
+       free_irq(ucb->irq, ucb);
+       input_unregister_device(ucb->ts_idev);
+       dev_set_drvdata(dev, NULL);
+       kfree(ucb);
+       return 0;
+}
+
+static struct device_driver ucb1400_ts_driver = {
+       .owner          = THIS_MODULE,
+       .bus            = &ac97_bus_type,
+       .probe          = ucb1400_ts_probe,
+       .remove         = ucb1400_ts_remove,
+       .resume         = ucb1400_ts_resume,
+};
+
+static int __init ucb1400_ts_init(void)
+{
+       return driver_register(&ucb1400_ts_driver);
+}
+
+static void __exit ucb1400_ts_exit(void)
+{
+       driver_unregister(&ucb1400_ts_driver);
+}
+
+module_param(adcsync, int, 0444);
+
+module_init(ucb1400_ts_init);
+module_exit(ucb1400_ts_exit);
+
+MODULE_DESCRIPTION("Philips UCB1400 touchscreen driver");
+MODULE_LICENSE("GPL");