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Commit c24eab4e authored by Ping Cheng's avatar Ping Cheng Committed by Jiri Kosina
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HID: wacom: retrieve name from HID descriptor for generic devices 



HID generic devices share the same default name, "Wacom HID". This
causes userland programs to show same device names for different
devices, which would confuse end users with same device names for
different devices too.

This patch uses name retrieved from HID descriptor, if a meaningful
name is reported. Otherwise, affix its product ID to "Wacom HID".

Names from descriptor may contain extra whitespaces. To comfort
readers' eyes, we removed those extra whitespaces too.

Signed-off-by: default avatarPing Cheng <pingc@wacom.com>
Reviewed-by: default avatarJason Gerecke <killertofu@gmail.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 007760cf

drivers/hid/wacom_sys.c

+47 −11
Original line number Original line Diff line number Diff line
@@ -1402,6 +1402,52 @@ static size_t wacom_compute_pktlen(struct hid_device *hdev) 
	return size;

	return size;

}

}





static void wacom_update_name(struct wacom *wacom)

{

	struct wacom_wac *wacom_wac = &wacom->wacom_wac;

	struct wacom_features *features = &wacom_wac->features;



	/* Generic devices name unspecified */

	if ((features->type == HID_GENERIC) && !strcmp("Wacom HID", features->name)) {

		if (strstr(wacom->hdev->name, "Wacom") ||

		    strstr(wacom->hdev->name, "wacom") ||

		    strstr(wacom->hdev->name, "WACOM")) {

			/* name is in HID descriptor, use it */

			strlcpy(wacom_wac->name, wacom->hdev->name,

				sizeof(wacom_wac->name));



			/* strip out excess whitespaces */

			while (1) {

				char *gap = strstr(wacom_wac->name, "  ");

				if (gap == NULL)

					break;

				/* shift everything including the terminator */

				memmove(gap, gap+1, strlen(gap));

			}

			/* get rid of trailing whitespace */

			if (wacom_wac->name[strlen(wacom_wac->name)-1] == ' ')

				wacom_wac->name[strlen(wacom_wac->name)-1] = '\0';

		} else {

			/* no meaningful name retrieved. use product ID */

			snprintf(wacom_wac->name, sizeof(wacom_wac->name),

				 "%s %X", features->name, wacom->hdev->product);

		}

	} else {

		strlcpy(wacom_wac->name, features->name, sizeof(wacom_wac->name));

	}



	/* Append the device type to the name */

	snprintf(wacom_wac->pad_name, sizeof(wacom_wac->pad_name),

		"%s Pad", wacom_wac->name);



	if (features->device_type != BTN_TOOL_FINGER)

		strlcat(wacom_wac->name, " Pen", WACOM_NAME_MAX);

	else if (features->touch_max)

		strlcat(wacom_wac->name, " Finger", WACOM_NAME_MAX);

	else

		strlcat(wacom_wac->name, " Pad", WACOM_NAME_MAX);

}



static int wacom_probe(struct hid_device *hdev,

static int wacom_probe(struct hid_device *hdev,

		const struct hid_device_id *id)

		const struct hid_device_id *id)

{

{
@@ -1484,17 +1530,7 @@ static int wacom_probe(struct hid_device *hdev, 
	wacom_setup_device_quirks(wacom);

	wacom_setup_device_quirks(wacom);

	wacom_calculate_res(features);

	wacom_calculate_res(features);





	strlcpy(wacom_wac->name, features->name, sizeof(wacom_wac->name));

	wacom_update_name(wacom);

	snprintf(wacom_wac->pad_name, sizeof(wacom_wac->pad_name),

		"%s Pad", features->name);



	/* Append the device type to the name */

	if (features->device_type != BTN_TOOL_FINGER)

		strlcat(wacom_wac->name, " Pen", WACOM_NAME_MAX);

	else if (features->touch_max)

		strlcat(wacom_wac->name, " Finger", WACOM_NAME_MAX);

	else

		strlcat(wacom_wac->name, " Pad", WACOM_NAME_MAX);





	error = wacom_add_shared_data(hdev);

	error = wacom_add_shared_data(hdev);

	if (error)

	if (error)