HID: Support Samsung IR remote

Samsung USB remotes (0419:0001) are rejected by kernel 2.6.23, because the
report descriptor from the remote contains a 48 bit HID report field. HID 1.11
states: Fields may span at most 4 bytes.

This patch, based on 2.6.23, fixes this by modifying the internal report
descriptor in hid-quirks.c. Additional user space support (e.g. LIRC) is
required to fetch the information from the hiddev interface.

The burden to reconstruct the data is moved into userspace (lirc through hiddev).
There is no need to set HID_QUIRK_HIDDEV quirk, as the device has also output
applications, which trigger the creation of hiddev device automatically.

Signed-off-by: Robert Schedel <r.schedel@yahoo.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

2 files changed, 37 insertions, 0 deletions

diff --git a/drivers/hid/usbhid/hid-quirks.c b/drivers/hid/usbhid/hid-quirks.c
index 68b38fdb1203..30f63e9f93a3 100644
--- a/drivers/hid/usbhid/hid-quirks.c
+++ b/drivers/hid/usbhid/hid-quirks.c
@@ -341,6 +341,9 @@
 #define USB_VENDOR_ID_SAITEK		0x06a3
 #define USB_DEVICE_ID_SAITEK_RUMBLEPAD	0xff17
 
+#define USB_VENDOR_ID_SAMSUNG		0x0419
+#define USB_DEVICE_ID_SAMSUNG_IR_REMOTE	0x0001
+
 #define USB_VENDOR_ID_SONY			0x054c
 #define USB_DEVICE_ID_SONY_PS3_CONTROLLER	0x0268
 
@@ -673,6 +676,8 @@ static const struct hid_rdesc_blacklist {
 
 	{ USB_VENDOR_ID_PETALYNX, USB_DEVICE_ID_PETALYNX_MAXTER_REMOTE, HID_QUIRK_RDESC_PETALYNX },
 
+	{ USB_VENDOR_ID_SAMSUNG, USB_DEVICE_ID_SAMSUNG_IR_REMOTE, HID_QUIRK_RDESC_SAMSUNG_REMOTE },
+
 	{ USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_1, HID_QUIRK_RDESC_SWAPPED_MIN_MAX },
 	{ USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_2, HID_QUIRK_RDESC_SWAPPED_MIN_MAX },
 
@@ -947,6 +952,33 @@ static void usbhid_fixup_logitech_descriptor(unsigned char *rdesc, int rsize)
 	}
 }
 
+/*
+ * Samsung IrDA remote controller (reports as Cypress USB Mouse).
+ *
+ * Vendor specific report #4 has a size of 48 bit,
+ * and therefore is not accepted when inspecting the descriptors.
+ * As a workaround we reinterpret the report as:
+ *   Variable type, count 6, size 8 bit, log. maximum 255
+ * The burden to reconstruct the data is moved into user space.
+ */
+static void usbhid_fixup_samsung_irda_descriptor(unsigned char *rdesc,
+						  int rsize)
+{
+	if (rsize >= 182 && rdesc[175] == 0x25
+			 && rdesc[176] == 0x40
+			 && rdesc[177] == 0x75
+			 && rdesc[178] == 0x30
+			 && rdesc[179] == 0x95
+			 && rdesc[180] == 0x01
+			 && rdesc[182] == 0x40) {
+		printk(KERN_INFO "Fixing up Samsung IrDA report descriptor\n");
+		rdesc[176] = 0xff;
+		rdesc[178] = 0x08;
+		rdesc[180] = 0x06;
+		rdesc[182] = 0x42;
+	}
+}
+
 /* Petalynx Maxter Remote has maximum for consumer page set too low */
 static void usbhid_fixup_petalynx_descriptor(unsigned char *rdesc, int rsize)
 {
@@ -1026,6 +1058,10 @@ static void __usbhid_fixup_report_descriptor(__u32 quirks, char *rdesc, unsigned
 
 	if (quirks & HID_QUIRK_RDESC_BUTTON_CONSUMER)
 		usbhid_fixup_button_consumer_descriptor(rdesc, rsize);
+
+	if (quirks & HID_QUIRK_RDESC_SAMSUNG_REMOTE)
+		usbhid_fixup_samsung_irda_descriptor(rdesc, rsize);
+
 }
 
 /**
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 6a70b788ee9c..3902690647b0 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -295,6 +295,7 @@ struct hid_item {
 #define HID_QUIRK_RDESC_PETALYNX		0x00000008
 #define HID_QUIRK_RDESC_MACBOOK_JIS		0x00000010
 #define HID_QUIRK_RDESC_BUTTON_CONSUMER		0x00000020
+#define HID_QUIRK_RDESC_SAMSUNG_REMOTE		0x00000040
 
 /*
  * This is the global environment of the parser. This information is