Input: add support for the HP Jornada 7xx (710/720/728) touchscreen

Signed-off-by: Kristoffer Ericson <Kristoffer.Ericson@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 182 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/jornada720_ts.c b/drivers/input/touchscreen/jornada720_ts.c
new file mode 100644
index 00000000000..42a1c9a1940
--- /dev/null
+++ b/drivers/input/touchscreen/jornada720_ts.c
@@ -0,0 +1,182 @@
+/*
+ * drivers/input/touchscreen/jornada720_ts.c
+ *
+ * Copyright (C) 2007 Kristoffer Ericson <Kristoffer.Ericson@gmail.com>
+ *
+ *  Copyright (C) 2006 Filip Zyzniewski <filip.zyzniewski@tefnet.pl>
+ *  based on HP Jornada 56x touchscreen driver by Alex Lange <chicken@handhelds.org>
+ *
+ * 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.
+ *
+ * HP Jornada 710/720/729 Touchscreen Driver
+ */
+
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+
+#include <asm/hardware.h>
+#include <asm/arch/jornada720.h>
+
+MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
+MODULE_DESCRIPTION("HP Jornada 710/720/728 touchscreen driver");
+MODULE_LICENSE("GPLv2");
+
+struct jornada_ts {
+	struct input_dev *dev;
+	int x_data[4];		/* X sample values */
+	int y_data[4];		/* Y sample values */
+};
+
+static void jornada720_ts_collect_data(struct jornada_ts *jornada_ts)
+{
+
+    /* 3 low word X samples */
+    jornada_ts->x_data[0] = jornada_ssp_byte(TXDUMMY);
+    jornada_ts->x_data[1] = jornada_ssp_byte(TXDUMMY);
+    jornada_ts->x_data[2] = jornada_ssp_byte(TXDUMMY);
+
+    /* 3 low word Y samples */
+    jornada_ts->y_data[0] = jornada_ssp_byte(TXDUMMY);
+    jornada_ts->y_data[1] = jornada_ssp_byte(TXDUMMY);
+    jornada_ts->y_data[2] = jornada_ssp_byte(TXDUMMY);
+
+    /* combined x samples bits */
+    jornada_ts->x_data[3] = jornada_ssp_byte(TXDUMMY);
+
+    /* combined y samples bits */
+    jornada_ts->y_data[3] = jornada_ssp_byte(TXDUMMY);
+}
+
+static int jornada720_ts_average(int coords[4])
+{
+	int coord, high_bits = coords[3];
+
+	coord  = coords[0] | ((high_bits & 0x03) << 8);
+	coord += coords[1] | ((high_bits & 0x0c) << 6);
+	coord += coords[2] | ((high_bits & 0x30) << 4);
+
+	return coord / 3;
+}
+
+static irqreturn_t jornada720_ts_interrupt(int irq, void *dev_id)
+{
+	struct platform_device *pdev = dev_id;
+	struct jornada_ts *jornada_ts = platform_get_drvdata(pdev);
+	struct input_dev *input = jornada_ts->dev;
+	int x, y;
+
+	/* If GPIO_GPIO9 is set to high then report pen up */
+	if (GPLR & GPIO_GPIO(9)) {
+		input_report_key(input, BTN_TOUCH, 0);
+		input_sync(input);
+	} else {
+		jornada_ssp_start();
+
+		/* proper reply to request is always TXDUMMY */
+		if (jornada_ssp_inout(GETTOUCHSAMPLES) == TXDUMMY) {
+			jornada720_ts_collect_data(jornada_ts);
+
+			x = jornada720_ts_average(jornada_ts->x_data);
+			y = jornada720_ts_average(jornada_ts->y_data);
+
+			input_report_key(input, BTN_TOUCH, 1);
+			input_report_abs(input, ABS_X, x);
+			input_report_abs(input, ABS_Y, y);
+			input_sync(input);
+		}
+
+		jornada_ssp_end();
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int __devinit jornada720_ts_probe(struct platform_device *pdev)
+{
+	struct jornada_ts *jornada_ts;
+	struct input_dev *input_dev;
+	int error;
+
+	jornada_ts = kzalloc(sizeof(struct jornada_ts), GFP_KERNEL);
+	input_dev = input_allocate_device();
+
+	if (!jornada_ts || !input_dev) {
+		error = -ENOMEM;
+		goto fail1;
+	}
+
+	platform_set_drvdata(pdev, jornada_ts);
+
+	jornada_ts->dev = input_dev;
+
+	input_dev->name = "HP Jornada 7xx Touchscreen";
+	input_dev->phys = "jornadats/input0";
+	input_dev->id.bustype = BUS_HOST;
+	input_dev->dev.parent = &pdev->dev;
+
+	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
+	input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
+	input_set_abs_params(input_dev, ABS_X, 270, 3900, 0, 0);
+	input_set_abs_params(input_dev, ABS_Y, 180, 3700, 0, 0);
+
+	error = request_irq(IRQ_GPIO9,
+			jornada720_ts_interrupt,
+			IRQF_DISABLED | IRQF_TRIGGER_RISING,
+			"HP7XX Touchscreen driver", pdev);
+	if (error) {
+		printk(KERN_INFO "HP7XX TS : Unable to acquire irq!\n");
+		goto fail1;
+	}
+
+	error = input_register_device(jornada_ts->dev);
+	if (error)
+		goto fail2;
+
+	return 0;
+
+ fail2:
+	free_irq(IRQ_GPIO9, pdev);
+ fail1:
+	platform_set_drvdata(pdev, NULL);
+	input_free_device(input_dev);
+	kfree(jornada_ts);
+	return error;
+}
+
+static int __devexit jornada720_ts_remove(struct platform_device *pdev)
+{
+	struct jornada_ts *jornada_ts = platform_get_drvdata(pdev);
+
+	free_irq(IRQ_GPIO9, pdev);
+	platform_set_drvdata(pdev, NULL);
+	input_unregister_device(jornada_ts->dev);
+	kfree(jornada_ts);
+
+	return 0;
+}
+
+static struct platform_driver jornada720_ts_driver = {
+	.probe		= jornada720_ts_probe,
+	.remove		= __devexit_p(jornada720_ts_remove),
+	.driver		= {
+		.name	= "jornada_ts",
+	},
+};
+
+static int __init jornada720_ts_init(void)
+{
+	return platform_driver_register(&jornada720_ts_driver);
+}
+
+static void __exit jornada720_ts_exit(void)
+{
+	platform_driver_unregister(&jornada720_ts_driver);
+}
+
+module_init(jornada720_ts_init);
+module_exit(jornada720_ts_exit);