From: Janne Grunau j@jannau.net
Those keyboards do not return the current device state. Polling will timeout unless there are key presses. This is not a problem during operation but the initial device state query during probing will fail. Skip this step in usb_kbd_probe_dev() to make these devices useable. Not all Apple keyboards behave like this. A keyboard with USB vendor/product ID 05ac:0221 is reported to work with the current code. Unfortunately some Keychron keyboards "re-use" Apple's vendor ID and show the same behavior (Keychron C2, 05ac:024f for example).
Reviewed-by: Marek Vasut marex@denx.de Reviewed-by: Neal Gompa neal@gompa.dev Signed-off-by: Janne Grunau j@jannau.net --- common/usb_kbd.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)
diff --git a/common/usb_kbd.c b/common/usb_kbd.c index b2361bbf18..820f591fc5 100644 --- a/common/usb_kbd.c +++ b/common/usb_kbd.c @@ -31,6 +31,10 @@ #define USB_DEVICE_ID_APPLE_MAGIC_KEYBOARD_FINGERPRINT_2021 0x029a #define USB_DEVICE_ID_APPLE_MAGIC_KEYBOARD_NUMPAD_2021 0x029f
+#define USB_VENDOR_ID_KEYCHRON 0x3434 + +#define USB_HID_QUIRK_POLL_NO_REPORT_IDLE BIT(0) + /* * If overwrite_console returns 1, the stdin, stderr and stdout * are switched to the serial port, else the settings in the @@ -474,6 +478,7 @@ static int usb_kbd_probe_dev(struct usb_device *dev, unsigned int ifnum) struct usb_interface *iface; struct usb_endpoint_descriptor *ep; struct usb_kbd_pdata *data; + unsigned int quirks = 0; int epNum;
if (dev->descriptor.bNumConfigurations != 1) @@ -506,6 +511,15 @@ static int usb_kbd_probe_dev(struct usb_device *dev, unsigned int ifnum)
debug("USB KBD: found interrupt EP: 0x%x\n", ep->bEndpointAddress);
+ switch (dev->descriptor.idVendor) { + case USB_VENDOR_ID_APPLE: + case USB_VENDOR_ID_KEYCHRON: + quirks |= USB_HID_QUIRK_POLL_NO_REPORT_IDLE; + break; + default: + break; + } + data = malloc(sizeof(struct usb_kbd_pdata)); if (!data) { printf("USB KBD: Error allocating private data\n"); @@ -546,6 +560,14 @@ static int usb_kbd_probe_dev(struct usb_device *dev, unsigned int ifnum) usb_set_idle(dev, iface->desc.bInterfaceNumber, 0, 0); #endif
+ /* + * Apple and Keychron keyboards do not report the device state. Reports + * are only returned during key presses. + */ + if (quirks & USB_HID_QUIRK_POLL_NO_REPORT_IDLE) { + debug("USB KBD: quirk: skip testing device state\n"); + return 1; + } debug("USB KBD: enable interrupt pipe...\n"); #ifdef CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE data->intq = create_int_queue(dev, data->intpipe, 1,