Re: [PATCH] HID: Add Wireless Radio Control feature for Chicony devices

[Chris Chiu]

On Tue, Dec 22, 2020 at 3:41 PM Jian-Hong Pan <jhp@xxxxxxxxxxxxx> wrote:
>
> Some Chicony's keyboards support airplane mode hotkey (Fn+F2) with
> "Wireless Radio Control" feature. For example, the wireless keyboard
> [04f2:1236] shipped with ASUS all-in-one desktop.
>
> After consulting Chicony for this hotkey, learned the device will send
> with 0x11 as the report ID and 0x1 as the value when the key is pressed
> down.
>
> This patch maps the event as KEY_RFKILL.
>
> Signed-off-by: Jian-Hong Pan <jhp@xxxxxxxxxxxxx>
> ---
>  drivers/hid/hid-chicony.c | 58 +++++++++++++++++++++++++++++++++++++++
>  drivers/hid/hid-ids.h     |  1 +
>  2 files changed, 59 insertions(+)
>
> diff --git a/drivers/hid/hid-chicony.c b/drivers/hid/hid-chicony.c
> index 3f0ed6a95223..aca963aa0f1e 100644
> --- a/drivers/hid/hid-chicony.c
> +++ b/drivers/hid/hid-chicony.c
> @@ -21,6 +21,42 @@
>
>  #include "hid-ids.h"
>
> +#define KEY_PRESSED                    0x01
> +#define CH_WIRELESS_CTL_REPORT_ID      0x11
> +
> +static int ch_report_wireless(struct hid_report *report, u8 *data, int size)
> +{
> +       struct hid_device *hdev = report->device;
> +       struct input_dev *input;
> +
> +       if (report->id != CH_WIRELESS_CTL_REPORT_ID ||
> +           report->maxfield != 1 ||
> +           *report->field[0]->value != KEY_PRESSED)

Maybe replace this line with hid_check_keys_pressed() and the KEY_PRESSED
is not required.

> +               return 0;
> +
> +       input = report->field[0]->hidinput->input;
> +       if (!input) {
> +               hid_warn(hdev, "can't find wireless radio control's input");
> +               return 0;
> +       }
> +
> +       input_report_key(input, KEY_RFKILL, 1);
> +       input_sync(input);
> +       input_report_key(input, KEY_RFKILL, 0);
> +       input_sync(input);
> +
> +       return 1;
> +}
> +
> +static int ch_raw_event(struct hid_device *hdev,
> +               struct hid_report *report, u8 *data, int size)
> +{
> +       if (report->application == HID_GD_WIRELESS_RADIO_CTLS)
> +               return ch_report_wireless(report, data, size);
> +
> +       return 0;
> +}
> +
>  #define ch_map_key_clear(c)    hid_map_usage_clear(hi, usage, bit, max, \
>                                         EV_KEY, (c))
>  static int ch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
> @@ -77,10 +113,30 @@ static __u8 *ch_switch12_report_fixup(struct hid_device *hdev, __u8 *rdesc,
>         return rdesc;
>  }
>
> +static int ch_probe(struct hid_device *hdev, const struct hid_device_id *id)
> +{
> +       int ret;
> +
> +       hdev->quirks |= HID_QUIRK_INPUT_PER_APP;
> +       ret = hid_parse(hdev);
> +       if (ret) {
> +               hid_err(hdev, "Chicony hid parse failed: %d\n", ret);
> +               return ret;
> +       }
> +
> +       ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
> +       if (ret) {
> +               hid_err(hdev, "Chicony hw start failed: %d\n", ret);
> +               return ret;
> +       }
> +
> +       return 0;
> +}
>
>  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_WIRELESS3) },
>         { HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_ACER_SWITCH12) },
>         { }
>  };
> @@ -91,6 +147,8 @@ static struct hid_driver ch_driver = {
>         .id_table = ch_devices,
>         .report_fixup = ch_switch12_report_fixup,
>         .input_mapping = ch_input_mapping,
> +       .probe = ch_probe,
> +       .raw_event = ch_raw_event,
>  };
>  module_hid_driver(ch_driver);
>
> diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
> index 4c5f23640f9c..06d90301a3dc 100644
> --- a/drivers/hid/hid-ids.h
> +++ b/drivers/hid/hid-ids.h
> @@ -270,6 +270,7 @@
>  #define USB_DEVICE_ID_CHICONY_PIXART_USB_OPTICAL_MOUSE 0x1053
>  #define USB_DEVICE_ID_CHICONY_PIXART_USB_OPTICAL_MOUSE2        0x0939
>  #define USB_DEVICE_ID_CHICONY_WIRELESS2        0x1123
> +#define USB_DEVICE_ID_CHICONY_WIRELESS3        0x1236
>  #define USB_DEVICE_ID_ASUS_AK1D                0x1125
>  #define USB_DEVICE_ID_CHICONY_TOSHIBA_WT10A    0x1408
>  #define USB_DEVICE_ID_CHICONY_ACER_SWITCH12    0x1421
> --
> 2.29.2
>