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authorНиколай Кудрявцев <nkudriavtsev@gmail.com>2015-07-21 13:31:52 +0300
committerJiri Kosina <jkosina@suse.com>2015-07-29 15:12:26 +0300
commit9a1d78a3780e0e37eeff11b377fc5fbb01446a36 (patch)
treeebb6789cc6ca4851e1fb387e702bc98d74e8eecb /drivers/hid/hid-chicony.c
parent874bf9ee69cdebc1e734a391d6b2fa3e08c9ff87 (diff)
downloadlinux-9a1d78a3780e0e37eeff11b377fc5fbb01446a36.tar.xz
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>
Diffstat (limited to 'drivers/hid/hid-chicony.c')
-rw-r--r--drivers/hid/hid-chicony.c26
1 files changed, 26 insertions, 0 deletions
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);