[PATCH] HID: add support for PenMount HID TouchScreen Driver v2

[Christian Gmeiner <christian.gmeiner@gmail.com>]

This patch adds a seperate hid-penmount driver to work
around an issue with the HID report descriptor. The
descriptor does not contain the ContactID usage and as
result the touchscreen is represented as normal mouse
to the system.

This driver maps the button 0 emitted by the touchscreen
to BTN_TOUCH. This makes it possible to use touch events
in userspace.

changes from v1 to v2
 - incorporated feedback from Benjamin Tissoires

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
---
 drivers/hid/Kconfig        |  6 ++++++
 drivers/hid/Makefile       |  1 +
 drivers/hid/hid-penmount.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 58 insertions(+)
 create mode 100644 drivers/hid/hid-penmount.c

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index c18d5d7..0351b66 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -530,6 +530,12 @@ config PANTHERLORD_FF
 	  Say Y here if you have a PantherLord/GreenAsia based game controller
 	  or adapter and want to enable force feedback support for it.
 
+config HID_PENMOUNT
+	tristate "Penmount touch device"
+	depends on USB_HID
+	---help---
+	  Say Y here if you have a Penmount based touch controller.
+
 config HID_PETALYNX
 	tristate "Petalynx Maxter remote control"
 	depends on HID
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index 4dbac7f..e2850d8 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -71,6 +71,7 @@ obj-$(CONFIG_HID_NTRIG)		+= hid-ntrig.o
 obj-$(CONFIG_HID_ORTEK)		+= hid-ortek.o
 obj-$(CONFIG_HID_PRODIKEYS)	+= hid-prodikeys.o
 obj-$(CONFIG_HID_PANTHERLORD)	+= hid-pl.o
+obj-$(CONFIG_HID_PENMOUNT)	+= hid-penmount.o
 obj-$(CONFIG_HID_PETALYNX)	+= hid-petalynx.o
 obj-$(CONFIG_HID_PICOLCD)	+= hid-picolcd.o
 hid-picolcd-y			+= hid-picolcd_core.o
diff --git a/drivers/hid/hid-penmount.c b/drivers/hid/hid-penmount.c
new file mode 100644
index 0000000..02de4b8
--- /dev/null
+++ b/drivers/hid/hid-penmount.c
@@ -0,0 +1,51 @@
+/*
+ *  HID driver for PenMount touchscreens
+ *
+ *  Copyright (c) 2014 Christian Gmeiner <christian.gmeiner@gmail.com>
+ *
+ *  based on hid-penmount copyrighted by
+ *    PenMount Touch Solutions <penmount@seed.net.tw>
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/hid.h>
+#include "hid-ids.h"
+
+static int penmount_input_mapping(struct hid_device *hdev,
+		struct hid_input *hi, struct hid_field *field,
+		struct hid_usage *usage, unsigned long **bit, int *max)
+{
+	int mapped = 0;
+
+	if ((usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON) {
+		hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
+		mapped = 1;
+	}
+
+	return mapped;
+}
+
+static const struct hid_device_id penmount_devices[] = {
+	{ HID_USB_DEVICE(USB_VENDOR_ID_PENMOUNT, USB_DEVICE_ID_PENMOUNT_6000) },
+	{ }
+};
+MODULE_DEVICE_TABLE(hid, penmount_devices);
+
+static struct hid_driver penmount_driver = {
+	.name = "hid-penmount",
+	.id_table = penmount_devices,
+	.input_mapping = penmount_input_mapping,
+};
+
+module_hid_driver(penmount_driver);
+
+MODULE_AUTHOR("Christian Gmeiner <christian.gmeiner@gmail.com>");
+MODULE_DESCRIPTION("PenMount HID TouchScreen driver");
+MODULE_LICENSE("GPL");
-- 
1.9.3