[PATCH] input: driver for touchscreen on iPaq h3xxx

[Linus Walleij <linus.walleij@linaro.org>]

From: Dmitry Artamonow <mad_soft@inbox.ru>

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.

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>
---
 drivers/input/touchscreen/Kconfig         |   8 ++
 drivers/input/touchscreen/Makefile        |   1 +
 drivers/input/touchscreen/ipaq-micro-ts.c | 137 ++++++++++++++++++++++++++++++
 3 files changed, 146 insertions(+)
 create mode 100644 drivers/input/touchscreen/ipaq-micro-ts.c

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index a23a94bb4bcb..26d0953c7094 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -471,6 +471,14 @@ config TOUCHSCREEN_HP7XX
 	  To compile this driver as a module, choose M here: the
 	  module will be called jornada720_ts.
 
+config TOUCHSCREEN_IPAQ_MICRO
+	tristate "HP iPAQ Atmel Micro ASIC touchscreen"
+	depends on MFD_IPAQ_MICRO
+	help
+	  This enables support for the touchscreen attached to
+	  the Atmel Micro peripheral controller on iPAQ h3100/h3600/h3700
+
+
 config TOUCHSCREEN_HTCPEN
 	tristate "HTC Shift X9500 touchscreen"
 	depends on ISA
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 126479d8c29a..4be94fce41af 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -46,6 +46,7 @@ obj-$(CONFIG_TOUCHSCREEN_MTOUCH)	+= mtouch.o
 obj-$(CONFIG_TOUCHSCREEN_MK712)		+= mk712.o
 obj-$(CONFIG_TOUCHSCREEN_HP600)		+= hp680_ts_input.o
 obj-$(CONFIG_TOUCHSCREEN_HP7XX)		+= jornada720_ts.o
+obj-$(CONFIG_TOUCHSCREEN_IPAQ_MICRO)	+= ipaq-micro-ts.o
 obj-$(CONFIG_TOUCHSCREEN_HTCPEN)	+= htcpen.o
 obj-$(CONFIG_TOUCHSCREEN_USB_COMPOSITE)	+= usbtouchscreen.o
 obj-$(CONFIG_TOUCHSCREEN_PCAP)		+= pcap_ts.o
diff --git a/drivers/input/touchscreen/ipaq-micro-ts.c b/drivers/input/touchscreen/ipaq-micro-ts.c
new file mode 100644
index 000000000000..9c5e1b62d192
--- /dev/null
+++ b/drivers/input/touchscreen/ipaq-micro-ts.c
@@ -0,0 +1,137 @@
+/*
+ * 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 : Linus Walleij <linus.walleij@linaro.org>
+ *
+ */
+
+#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, (msg[2]<<8)+msg[3]);
+		input_report_abs(ts->input, ABS_Y, (msg[0]<<8)+msg[1]);
+		input_report_abs(ts->input, ABS_PRESSURE, 1);
+		input_report_key(ts->input, BTN_TOUCH, 0);
+	}
+	if (len == 0) {
+		input_report_abs(ts->input, ABS_X, 0);
+		input_report_abs(ts->input, ABS_Y, 0);
+		input_report_abs(ts->input, ABS_PRESSURE, 0);
+		input_report_key(ts->input, BTN_TOUCH, 1);
+	}
+	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 = input_allocate_device();
+
+	ts->input->evbit[0] = BIT(EV_ABS);
+	ts->input->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE);
+	input_set_abs_params(ts->input, ABS_X, 0, 1023, 0, 0);
+	input_set_abs_params(ts->input, ABS_Y, 0, 1023, 0, 0);
+	input_set_abs_params(ts->input, ABS_PRESSURE, 0x0, 0x1, 0, 0);
+
+	ts->input->name = "ipaq micro ts";
+	/* ts->input->private = ts; */
+
+	ret = input_register_device(ts->input);
+	if (ret) {
+		dev_err(&pdev->dev, "error registering touch input\n");
+		return ret;
+	}
+
+	spin_lock(&ts->micro->lock);
+	ts->micro->ts = micro_ts_receive;
+	ts->micro->ts_data = ts;
+	spin_unlock(&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(&ts->micro->lock);
+	ts->micro->ts = NULL;
+	ts->micro->ts_data = NULL;
+	spin_unlock(&ts->micro->lock);
+	input_unregister_device(ts->input);
+
+	return 0;
+}
+
+static int micro_ts_suspend(struct device *dev)
+{
+	struct touchscreen_data *ts = dev_get_drvdata(dev);
+
+	spin_lock(&ts->micro->lock);
+	ts->micro->ts = NULL;
+	ts->micro->ts_data = NULL;
+	spin_unlock(&ts->micro->lock);
+	return 0;
+}
+
+static int micro_ts_resume(struct device *dev)
+{
+	struct touchscreen_data *ts = dev_get_drvdata(dev);
+
+	spin_lock(&ts->micro->lock);
+	ts->micro->ts = micro_ts_receive;
+	ts->micro->ts_data = ts;
+	spin_unlock(&ts->micro->lock);
+	return 0;
+}
+
+static const struct dev_pm_ops micro_ts_dev_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(micro_ts_suspend, micro_ts_resume)
+};
+
+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");
-- 
1.9.3