Re: [PATCH v4 1/2] HID: quirks: Refactor ELAN 400 and 401 handling

[Bjorn Andersson <bjorn.andersson@linaro.org>]

On Tue 23 Apr 09:06 PDT 2019, Jeffrey Hugo wrote:

> There needs to be coordination between hid-quirks and the elan_i2c driver
> about which devices are handled by what drivers.  Currently, both use
> whitelists, which results in valid devices being unhandled by default,
> when they should not be rejected by hid-quirks.  This is quickly becoming
> an issue.
> 
> Since elan_i2c has a maintained whitelist of what devices it will handle,
> use that to implement a blacklist in hid-quirks so that only the devices
> that need to be handled by elan_i2c get rejected by hid-quirks, and
> everything else is handled by default.  The downside is the whitelist and
> blacklist need to be kept in sync.
> 

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Jiri, the two patches in this series doesn't have a build time
dependency, so if you take this one through your tree I'll take 2/2
through arm-soc.

Regards,
Bjorn

> Suggested-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
> Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
> ---
>  drivers/hid/hid-quirks.c            | 64 ++++++++++++++++++++++++-----
>  drivers/input/mouse/elan_i2c_core.c |  4 ++
>  2 files changed, 58 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/hid/hid-quirks.c b/drivers/hid/hid-quirks.c
> index 77ffba48cc73..656485e08eb7 100644
> --- a/drivers/hid/hid-quirks.c
> +++ b/drivers/hid/hid-quirks.c
> @@ -987,17 +987,61 @@ bool hid_ignore(struct hid_device *hdev)
>  		break;
>  	case USB_VENDOR_ID_ELAN:
>  		/*
> -		 * Many Elan devices have a product id of 0x0401 and are handled
> -		 * by the elan_i2c input driver. But the ACPI HID ELAN0800 dev
> -		 * is not (and cannot be) handled by that driver ->
> -		 * Ignore all 0x0401 devs except for the ELAN0800 dev.
> +		 * Blacklist of everything that gets handled by the elan_i2c
> +		 * input driver.  This should be kept in sync with the whitelist
> +		 * that exists in that driver.  This avoids disabling valid
> +		 * touchpads and other ELAN devices.
>  		 */
> -		if (hdev->product == 0x0401 &&
> -		    strncmp(hdev->name, "ELAN0800", 8) != 0)
> -			return true;
> -		/* Same with product id 0x0400 */
> -		if (hdev->product == 0x0400 &&
> -		    strncmp(hdev->name, "QTEC0001", 8) != 0)
> +		if ((hdev->product == 0x0401 || hdev->product == 0x0400) &&
> +		   (strncmp(hdev->name, "ELAN0000", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0100", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0600", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0601", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0602", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0603", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0604", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0605", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0606", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0607", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0608", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0609", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN060B", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN060C", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN060F", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0610", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0611", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0612", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0613", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0614", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0615", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0616", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0617", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0618", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0619", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN061A", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN061B", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN061C", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN061D", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN061E", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN061F", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0620", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0621", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0622", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0623", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0624", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0625", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0626", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0627", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0628", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0629", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN062A", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN062B", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN062C", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN062D", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0631", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN0632", 8) == 0 ||
> +		    strncmp(hdev->name, "ELAN1000", 8) == 0 ||
> +		    strncmp(hdev->name, "elan,ekth3000", 13) == 0))
>  			return true;
>  		break;
>  	}
> diff --git a/drivers/input/mouse/elan_i2c_core.c b/drivers/input/mouse/elan_i2c_core.c
> index f9525d6f0bfe..3ded19528cd4 100644
> --- a/drivers/input/mouse/elan_i2c_core.c
> +++ b/drivers/input/mouse/elan_i2c_core.c
> @@ -1332,6 +1332,10 @@ static const struct i2c_device_id elan_id[] = {
>  };
>  MODULE_DEVICE_TABLE(i2c, elan_id);
>  
> +/*
> + * when these whtielists get updated, the corresponding blacklist in hid-quirks
> + * needs to be updated to match.
> + */
>  #ifdef CONFIG_ACPI
>  static const struct acpi_device_id elan_acpi_id[] = {
>  	{ "ELAN0000", 0 },
> -- 
> 2.17.1
>