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Bugzilla: 1046238
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Upstream-status: Queued for 3.14
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From 1d0d6df02750b4a6f466768cbfbf860e24f4c8d4 Mon Sep 17 00:00:00 2001
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From: Ping Cheng <pinglinux@gmail.com>
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Date: Mon, 25 Nov 2013 18:43:45 -0800
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Subject: [PATCH] Input: wacom - make sure touch_max is set for touch devices
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Old single touch Tablet PCs do not have touch_max set at
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wacom_features. Since touch device at lease supports one
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finger, assign touch_max to 1 when touch usage is defined
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in its HID Descriptor and touch_max is not pre-defined.
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Tested-by: Jason Gerecke <killertofu@gmail.com>
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Signed-off-by: Ping Cheng <pingc@wacom.com>
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Reviewed-by: Chris Bagwell <chris@cnpbagwell.com>
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Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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---
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drivers/input/tablet/wacom_sys.c | 7 +++++--
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1 file changed, 5 insertions(+), 2 deletions(-)
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diff --git a/drivers/input/tablet/wacom_sys.c b/drivers/input/tablet/wacom_sys.c
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index 8a90da1..3d71b60 100644
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--- a/drivers/input/tablet/wacom_sys.c
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+++ b/drivers/input/tablet/wacom_sys.c
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@@ -304,7 +304,7 @@ static int wacom_parse_hid(struct usb_interface *intf,
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struct usb_device *dev = interface_to_usbdev(intf);
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char limit = 0;
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/* result has to be defined as int for some devices */
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- int result = 0;
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+ int result = 0, touch_max = 0;
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int i = 0, usage = WCM_UNDEFINED, finger = 0, pen = 0;
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unsigned char *report;
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@@ -351,7 +351,8 @@ static int wacom_parse_hid(struct usb_interface *intf,
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if (usage == WCM_DESKTOP) {
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if (finger) {
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features->device_type = BTN_TOOL_FINGER;
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-
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+ /* touch device at least supports one touch point */
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+ touch_max = 1;
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switch (features->type) {
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case TABLETPC2FG:
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features->pktlen = WACOM_PKGLEN_TPC2FG;
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@@ -504,6 +505,8 @@ static int wacom_parse_hid(struct usb_interface *intf,
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}
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out:
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+ if (!features->touch_max && touch_max)
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+ features->touch_max = touch_max;
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result = 0;
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kfree(report);
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return result;
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--
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1.8.4.2
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