Blob Blame Raw
From 98f07385212073536f303c07ece455acdd4d267f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9D=D0=B8=D0=BA=D0=BE=D0=BB=D0=B0=D0=B9=20=D0=9A=D1=83?=
 =?UTF-8?q?=D0=B4=D1=80=D1=8F=D0=B2=D1=86=D0=B5=D0=B2?=
 <nkudriavtsev@gmail.com>
Date: Tue, 21 Jul 2015 13:31:52 +0300
Subject: [PATCH] HID: chicony: Add support for Acer Aspire Switch 12

Acer Aspire Switch 12 keyboard Chicony's controller reports too big usage
index on the 1st interface. The patch fixes the report. The work based on
solution from drivers/hid/hid-holtek-mouse.c

Bug report: https://bugzilla.kernel.org/show_bug.cgi?id=101721

Signed-off-by: Nicholas Kudriavtsev <nkudriavtsev@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
---
 drivers/hid/hid-chicony.c | 26 ++++++++++++++++++++++++++
 drivers/hid/hid-core.c    |  1 +
 drivers/hid/hid-ids.h     |  1 +
 3 files changed, 28 insertions(+)

diff --git a/drivers/hid/hid-chicony.c b/drivers/hid/hid-chicony.c
index b613d5a79684..bc3cec199fee 100644
--- a/drivers/hid/hid-chicony.c
+++ b/drivers/hid/hid-chicony.c
@@ -20,6 +20,7 @@
 #include <linux/input.h>
 #include <linux/hid.h>
 #include <linux/module.h>
+#include <linux/usb.h>
 
 #include "hid-ids.h"
 
@@ -57,10 +58,34 @@ static int ch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
 	return 1;
 }
 
+static __u8 *ch_switch12_report_fixup(struct hid_device *hdev, __u8 *rdesc,
+		unsigned int *rsize)
+{
+	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
+	
+	if (intf->cur_altsetting->desc.bInterfaceNumber == 1) {
+		/* Change usage maximum and logical maximum from 0x7fff to
+		 * 0x2fff, so they don't exceed HID_MAX_USAGES */
+		switch (hdev->product) {
+		case USB_DEVICE_ID_CHICONY_ACER_SWITCH12:
+			if (*rsize >= 128 && rdesc[64] == 0xff && rdesc[65] == 0x7f
+					&& rdesc[69] == 0xff && rdesc[70] == 0x7f) {
+				hid_info(hdev, "Fixing up report descriptor\n");
+				rdesc[65] = rdesc[70] = 0x2f;
+			}
+			break;
+		}
+
+	}
+	return rdesc;
+}
+
+
 static const struct hid_device_id ch_devices[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_TACTICAL_PAD) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_WIRELESS2) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_AK1D) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_ACER_SWITCH12) },
 	{ }
 };
 MODULE_DEVICE_TABLE(hid, ch_devices);
@@ -68,6 +93,7 @@ MODULE_DEVICE_TABLE(hid, ch_devices);
 static struct hid_driver ch_driver = {
 	.name = "chicony",
 	.id_table = ch_devices,
+	.report_fixup = ch_switch12_report_fixup,
 	.input_mapping = ch_input_mapping,
 };
 module_hid_driver(ch_driver);
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index e6fce23b121a..f90ca6574221 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1807,6 +1807,7 @@ static const struct hid_device_id hid_have_special_driver[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_WIRELESS) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_WIRELESS2) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_AK1D) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_ACER_SWITCH12) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_CREATIVELABS, USB_DEVICE_ID_PRODIKEYS_PCMIDI) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_CYGNAL, USB_DEVICE_ID_CYGNAL_CP2112) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_1) },
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index b3b225b75d0a..79210ca8eff1 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -233,6 +233,7 @@
 #define USB_DEVICE_ID_CHICONY_PIXART_USB_OPTICAL_MOUSE	0x1053
 #define USB_DEVICE_ID_CHICONY_WIRELESS2	0x1123
 #define USB_DEVICE_ID_CHICONY_AK1D	0x1125
+#define USB_DEVICE_ID_CHICONY_ACER_SWITCH12	0x1421
 
 #define USB_VENDOR_ID_CHUNGHWAT		0x2247
 #define USB_DEVICE_ID_CHUNGHWAT_MULTITOUCH	0x0001
-- 
2.4.3