iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

HID: rmi: Use SET_REPORT request on control endpoint for Acer Switch 3 and 5

Browse Source 
The touchpad on the cover keyboard for the Acer Switch 3 and 5 does not
work as-is under Linux. Both devices have the same usb id for the cover
keyboard.

The kernel correctly assigns the hid-rmi driver to the device using usbhid
for transport.
Any attempts of hid-rmi to talk to the device using hid_hw_output_report
fail however as usbhid does not have a working urbout due to the lack of
any out endpoints.

Looking through Wireshark usbmon recordings from the Windows Synaptics
driver for this computer running inside of QEMU shows that it should be
using SET_REPORT requests instead.

This replaces the hid_hw_output_report in hid-rmi with a
hid_hw_raw_request for this device, which is at least enough to enable
the kernel to get working multi-touch input.

Signed-off-by: Tobias Auerochs <tobi291019@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Tobias Auerochs 2019-04-20 21:19:51 +02:00 committed by Jiri Kosina
parent ced2c0c53d
commit 10235380d1
2 changed files with 15 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/hid/hid-ids.h
View File

@ -1089,6 +1089,7 @@
#define USB_DEVICE_ID_SYNAPTICS_HD 0x0ac3
#define USB_DEVICE_ID_SYNAPTICS_QUAD_HD 0x1ac3
#define USB_DEVICE_ID_SYNAPTICS_TP_V103 0x5710
#define USB_DEVICE_ID_SYNAPTICS_ACER_SWITCH5 0x81a7
#define USB_VENDOR_ID_TEXAS_INSTRUMENTS 0x2047
#define USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA 0x0855

15
drivers/hid/hid-rmi.c
View File

@ -39,6 +39,7 @@
/* device flags */
#define RMI_DEVICE BIT(0)
#define RMI_DEVICE_HAS_PHYS_BUTTONS BIT(1)
#define RMI_DEVICE_OUTPUT_SET_REPORT BIT(2)
/*
* retrieve the ctrl registers
@ -167,9 +168,19 @@ static int rmi_set_mode(struct hid_device *hdev, u8 mode)
static int rmi_write_report(struct hid_device *hdev, u8 *report, int len)
{
struct rmi_data *data = hid_get_drvdata(hdev);
int ret;
ret = hid_hw_output_report(hdev, (void *)report, len);
if (data->device_flags & RMI_DEVICE_OUTPUT_SET_REPORT) {
/*
* Talk to device by using SET_REPORT requests instead.
*/
ret = hid_hw_raw_request(hdev, report[0], report,
len, HID_OUTPUT_REPORT, HID_REQ_SET_REPORT);
} else {
ret = hid_hw_output_report(hdev, (void *)report, len);
}
if (ret < 0) {
dev_err(&hdev->dev, "failed to write hid report (%d)\n", ret);
return ret;
@ -751,6 +762,8 @@ static const struct hid_device_id rmi_id[] = {
.driver_data = RMI_DEVICE_HAS_PHYS_BUTTONS },
{ HID_USB_DEVICE(USB_VENDOR_ID_LENOVO, USB_DEVICE_ID_LENOVO_X1_COVER) },
{ HID_USB_DEVICE(USB_VENDOR_ID_PRIMAX, USB_DEVICE_ID_PRIMAX_REZEL) },
{ HID_USB_DEVICE(USB_VENDOR_ID_SYNAPTICS, USB_DEVICE_ID_SYNAPTICS_ACER_SWITCH5),
.driver_data = RMI_DEVICE_OUTPUT_SET_REPORT },
{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_RMI, HID_ANY_ID, HID_ANY_ID) },
{ }
};