HID: Asus X205TA keyboard driver

Asus X205TA built-in keyboard contains wrong
logical maximum value in report descriptor.

0x05, 0x01,  // Usage Page (Generic Desktop)
0x09, 0x06,  // Usage (Keyboard)
0xa1, 0x01,  // Collection (Application)
0x85, 0x01,  // Report ID (1)
0x05, 0x07,  // Usage Page (Keyboard/Keypad)
0x19, 0xe0,  // Usage Minimum (224)
0x29, 0xe7,  // Usage Maximum (231)
0x15, 0x00,  // Logical Minimum (0)
0x25, 0x01,  // Logical Maximum (1)
0x75, 0x01,  // Report Size (1)
0x95, 0x08,  // Report Count (8)
0x81, 0x02,  // Input (Data,Array,Abs)
0x95, 0x01,  // Report Count (1)
0x75, 0x08,  // Report Size (8)
0x81, 0x03,  // Input (Const,Var,Abs)
0x95, 0x05,  // Report Count (5)
0x75, 0x01,  // Report Size (1)
0x05, 0x08,  // Usage (LED)
0x19, 0x01,  // Usage Minimum (1)
0x29, 0x05,  // Usage Maximum (5)
0x91, 0x02,  // Output (Data,Var,Abs)
0x95, 0x01,  // Report Count (1)
0x75, 0x03,  // Report Size (3)
0x91, 0x03,  // Output (Const,Var,Abs)
0x95, 0x06,  // Report Count (6)
0x75, 0x08,  // Report Size (8)
0x15, 0x00,  // Logical Minimum (0)
0x25, 0x65,  // Logical Maximum (101)  * too small *
0x05, 0x07,  // Usage Page (Keyboard/Keypad)
0x19, 0x00,  // Usage Minimum (0)
0x29, 0xdd,  // Usage Maximum (221)
0x81, 0x00,  // Input(Data,Array,Abs)

In Asus X205TA japanese keyboard model,there are language
specific keys over usage id 101.
This patch correct wrong logical maximum in report
descriptor.

Signed-off-by: Yusuke Fujimaki <usk.fujimaki@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 48 insertions, 0 deletions

diff --git a/drivers/hid/hid-asus.c b/drivers/hid/hid-asus.c
new file mode 100644
index 000000000000..1734e11298ed
--- /dev/null
+++ b/drivers/hid/hid-asus.c
@@ -0,0 +1,48 @@
+/*
+ *  HID driver for Asus X205TA built-in keyboard.
+ *  Fixes small logical maximum to match usage maximum.
+ *
+ *  Copyright (c) 2016 Yusuke Fujimaki <usk.fujimaki@gmail.com>
+ *
+ *  This module based on hid-ortek by
+ *  Copyright (c) 2010 Johnathon Harris <jmharris@gmail.com>
+ *  Copyright (c) 2011 Jiri Kosina
+ */
+
+/*
+ * 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/device.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+
+#include "hid-ids.h"
+
+static __u8 *asus_report_fixup(struct hid_device *hdev, __u8 *rdesc,
+		unsigned int *rsize)
+{
+	if (*rsize >= 180 && rdesc[54] == 0x25 && rdesc[55] == 0x65) {
+		hid_info(hdev, "Fixing up Asus X205TA report descriptor\n");
+		rdesc[55] = 0xdd;
+	}
+	return rdesc;
+}
+
+static const struct hid_device_id asus_devices[] = {
+	{ HID_I2C_DEVICE(USB_VENDOR_ID_ASUSTEK, USB_DEVICE_ID_ASUSTEK_X205TA_KEYBOARD) },
+	{ }
+};
+MODULE_DEVICE_TABLE(hid, asus_devices);
+
+static struct hid_driver asus_driver = {
+	.name = "asus",
+	.id_table = asus_devices,
+	.report_fixup = asus_report_fixup
+};
+module_hid_driver(asus_driver);
+
+MODULE_LICENSE("GPL");