1 files changed, 129 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/hp680_ts_input.c b/drivers/input/touchscreen/hp680_ts_input.c
new file mode 100644
index 0000000..a89700e
--- /dev/null
+++ b/drivers/input/touchscreen/hp680_ts_input.c
@@ -0,0 +1,129 @@
+#include <linux/input.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <asm/io.h>
+#include <asm/delay.h>
+#include <asm/adc.h>
+#include <mach/hp6xx.h>
+
+#define MODNAME "hp680_ts_input"
+
+#define HP680_TS_ABS_X_MIN	40
+#define HP680_TS_ABS_X_MAX	950
+#define HP680_TS_ABS_Y_MIN	80
+#define HP680_TS_ABS_Y_MAX	910
+
+#define	PHDR	0xa400012e
+#define SCPDR	0xa4000136
+
+static void do_softint(struct work_struct *work);
+
+static struct input_dev *hp680_ts_dev;
+static DECLARE_DELAYED_WORK(work, do_softint);
+
+static void do_softint(struct work_struct *work)
+{
+	int absx = 0, absy = 0;
+	u8 scpdr;
+	int touched = 0;
+
+	if (ctrl_inb(PHDR) & PHDR_TS_PEN_DOWN) {
+		scpdr = ctrl_inb(SCPDR);
+		scpdr |= SCPDR_TS_SCAN_ENABLE;
+		scpdr &= ~SCPDR_TS_SCAN_Y;
+		ctrl_outb(scpdr, SCPDR);
+		udelay(30);
+
+		absy = adc_single(ADC_CHANNEL_TS_Y);
+
+		scpdr = ctrl_inb(SCPDR);
+		scpdr |= SCPDR_TS_SCAN_Y;
+		scpdr &= ~SCPDR_TS_SCAN_X;
+		ctrl_outb(scpdr, SCPDR);
+		udelay(30);
+
+		absx = adc_single(ADC_CHANNEL_TS_X);
+
+		scpdr = ctrl_inb(SCPDR);
+		scpdr |= SCPDR_TS_SCAN_X;
+		scpdr &= ~SCPDR_TS_SCAN_ENABLE;
+		ctrl_outb(scpdr, SCPDR);
+		udelay(100);
+		touched = ctrl_inb(PHDR) & PHDR_TS_PEN_DOWN;
+	}
+
+	if (touched) {
+		input_report_key(hp680_ts_dev, BTN_TOUCH, 1);
+		input_report_abs(hp680_ts_dev, ABS_X, absx);
+		input_report_abs(hp680_ts_dev, ABS_Y, absy);
+	} else {
+		input_report_key(hp680_ts_dev, BTN_TOUCH, 0);
+	}
+
+	input_sync(hp680_ts_dev);
+	enable_irq(HP680_TS_IRQ);
+}
+
+static irqreturn_t hp680_ts_interrupt(int irq, void *dev)
+{
+	disable_irq_nosync(irq);
+	schedule_delayed_work(&work, HZ / 20);
+
+	return IRQ_HANDLED;
+}
+
+static int __init hp680_ts_init(void)
+{
+	int err;
+
+	hp680_ts_dev = input_allocate_device();
+	if (!hp680_ts_dev)
+		return -ENOMEM;
+
+	hp680_ts_dev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY);
+	hp680_ts_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+
+	input_set_abs_params(hp680_ts_dev, ABS_X,
+		HP680_TS_ABS_X_MIN, HP680_TS_ABS_X_MAX, 0, 0);
+	input_set_abs_params(hp680_ts_dev, ABS_Y,
+		HP680_TS_ABS_Y_MIN, HP680_TS_ABS_Y_MAX, 0, 0);
+
+	hp680_ts_dev->name = "HP Jornada touchscreen";
+	hp680_ts_dev->phys = "hp680_ts/input0";
+
+	if (request_irq(HP680_TS_IRQ, hp680_ts_interrupt,
+			IRQF_DISABLED, MODNAME, 0) < 0) {
+		printk(KERN_ERR "hp680_touchscreen.c: Can't allocate irq %d\n",
+		       HP680_TS_IRQ);
+		err = -EBUSY;
+		goto fail1;
+	}
+
+	err = input_register_device(hp680_ts_dev);
+	if (err)
+		goto fail2;
+
+	return 0;
+
+ fail2:	free_irq(HP680_TS_IRQ, NULL);
+	cancel_delayed_work(&work);
+	flush_scheduled_work();
+ fail1:	input_free_device(hp680_ts_dev);
+	return err;
+}
+
+static void __exit hp680_ts_exit(void)
+{
+	free_irq(HP680_TS_IRQ, NULL);
+	cancel_delayed_work(&work);
+	flush_scheduled_work();
+	input_unregister_device(hp680_ts_dev);
+}
+
+module_init(hp680_ts_init);
+module_exit(hp680_ts_exit);
+
+MODULE_AUTHOR("Andriy Skulysh, askulysh@image.kiev.ua");
+MODULE_DESCRIPTION("HP Jornada 680 touchscreen driver");
+MODULE_LICENSE("GPL");