Input: driver for touchscreen on iPaq h3xxx

This adds a driver for the touchscreen connected to the Atmel
microcontroller on the iPAQ h3xxx series.

Based on a driver from handhelds.org 2.6.21 kernel, written by Alessandro
GARDICH, with the bulk of the code for the new input architecture rewritten
by Dmitry Atamonow, and the final polish by Linus Walleij.

Signed-off-by: Alessandro GARDICH <gremlin@gremlin.it>
Signed-off-by: Dmitry Artamonow <mad_soft@inbox.ru>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 142 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/ipaq-micro-ts.c b/drivers/input/touchscreen/ipaq-micro-ts.c
new file mode 100644
index 000000000000..53fa5c361be1
--- /dev/null
+++ b/drivers/input/touchscreen/ipaq-micro-ts.c
@@ -0,0 +1,142 @@
+/*
+ * 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.
+ *
+ * h3600 atmel micro companion support, touchscreen subdevice
+ * Author : Alessandro Gardich <gremlin@gremlin.it>
+ * Author : Dmitry Artamonow <mad_soft@inbox.ru>
+ * Author : Linus Walleij <linus.walleij@linaro.org>
+ *
+ */
+
+#include <asm/byteorder.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/pm.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/input.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/mfd/ipaq-micro.h>
+
+struct touchscreen_data {
+	struct input_dev *input;
+	struct ipaq_micro *micro;
+};
+
+static void micro_ts_receive(void *data, int len, unsigned char *msg)
+{
+	struct touchscreen_data *ts = data;
+
+	if (len == 4) {
+		input_report_abs(ts->input, ABS_X,
+				 be16_to_cpup((__be16 *) &msg[2]));
+		input_report_abs(ts->input, ABS_Y,
+				 be16_to_cpup((__be16 *) &msg[0]));
+		input_report_key(ts->input, BTN_TOUCH, 1);
+		input_sync(ts->input);
+	} else if (len == 0) {
+		input_report_abs(ts->input, ABS_X, 0);
+		input_report_abs(ts->input, ABS_Y, 0);
+		input_report_key(ts->input, BTN_TOUCH, 0);
+		input_sync(ts->input);
+	}
+}
+
+static int micro_ts_probe(struct platform_device *pdev)
+{
+	struct touchscreen_data *ts;
+	int ret;
+
+	ts = devm_kzalloc(&pdev->dev, sizeof(*ts), GFP_KERNEL);
+	if (!ts)
+		return -ENOMEM;
+	ts->micro = dev_get_drvdata(pdev->dev.parent);
+
+	platform_set_drvdata(pdev, ts);
+
+	ts->input = devm_input_allocate_device(&pdev->dev);
+	if (!ts->input) {
+		dev_err(&pdev->dev, "failed to allocate input device\n");
+		return -ENOMEM;
+	}
+
+	input_set_capability(ts->input, EV_KEY, BTN_TOUCH);
+	input_set_capability(ts->input, EV_ABS, ABS_X);
+	input_set_capability(ts->input, EV_ABS, ABS_Y);
+	input_set_abs_params(ts->input, ABS_X, 0, 1023, 0, 0);
+	input_set_abs_params(ts->input, ABS_Y, 0, 1023, 0, 0);
+
+	ts->input->name = "ipaq micro ts";
+
+	ret = input_register_device(ts->input);
+	if (ret) {
+		dev_err(&pdev->dev, "error registering touch input\n");
+		return ret;
+	}
+
+	spin_lock_irq(&ts->micro->lock);
+	ts->micro->ts = micro_ts_receive;
+	ts->micro->ts_data = ts;
+	spin_unlock_irq(&ts->micro->lock);
+
+	dev_info(&pdev->dev, "iPAQ micro touchscreen\n");
+	return 0;
+}
+
+static int micro_ts_remove(struct platform_device *pdev)
+{
+	struct touchscreen_data *ts = platform_get_drvdata(pdev);
+
+	spin_lock_irq(&ts->micro->lock);
+	ts->micro->ts = NULL;
+	ts->micro->ts_data = NULL;
+	spin_unlock_irq(&ts->micro->lock);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int micro_ts_suspend(struct device *dev)
+{
+	struct touchscreen_data *ts = dev_get_drvdata(dev);
+
+	spin_lock_irq(&ts->micro->lock);
+	ts->micro->ts = NULL;
+	ts->micro->ts_data = NULL;
+	spin_unlock_irq(&ts->micro->lock);
+	return 0;
+}
+
+static int micro_ts_resume(struct device *dev)
+{
+	struct touchscreen_data *ts = dev_get_drvdata(dev);
+
+	spin_lock_irq(&ts->micro->lock);
+	ts->micro->ts = micro_ts_receive;
+	ts->micro->ts_data = ts;
+	spin_unlock_irq(&ts->micro->lock);
+	return 0;
+}
+#endif
+
+static const struct dev_pm_ops micro_ts_dev_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(micro_ts_suspend, micro_ts_resume)
+};
+
+static struct platform_driver micro_ts_device_driver = {
+	.driver	= {
+		.name	= "ipaq-micro-ts",
+		.pm	= &micro_ts_dev_pm_ops,
+	},
+	.probe	= micro_ts_probe,
+	.remove	= micro_ts_remove,
+};
+module_platform_driver(micro_ts_device_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("driver for iPAQ Atmel micro touchscreen");
+MODULE_ALIAS("platform:ipaq-micro-ts");