HID: handle cases of volume knobs generating relative values

There are some devices (for example Dell Multimedia Keyboard SK-8135) that have
a volume control knob which generates relative events instead of absolute.
hid-input maps them to ABS_VOLUME. HUT pages don't restrict volume to absolute
values.

Adding REL_VOLUME doesn't seem feasible, nothing knows how to handle it. This
patch translates relative ABS_VOLUME events into appropriate number of series
of VOLUME_UP or VOLUME_DOWN events respectively, so that userspace sees the
correct values in the end.

kernel.org bugzilla 5233

Reported-by: Jochen Eisinger <jochen@penguin-breeder.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 60de16a83c3e..bf7e307503cc 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -882,6 +882,16 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
                         field->dpad = usage->code;
         }
 
+        /* for those devices which produce Consumer volume usage as relative,
+         * we emulate pressing volumeup/volumedown appropriate number of times
+         * in hidinput_hid_event()
+         */
+        if ((usage->type == EV_ABS) && (field->flags & HID_MAIN_ITEM_RELATIVE) &&
+                        (usage->code == ABS_VOLUME)) {
+                set_bit(KEY_VOLUMEUP, input->keybit);
+                set_bit(KEY_VOLUMEDOWN, input->keybit);
+        }
+
         hid_resolv_event(usage->type, usage->code);
 #ifdef CONFIG_HID_DEBUG
         printk("\n");
@@ -972,6 +982,21 @@ void hidinput_hid_event(struct hid_device *hid, struct hid_field *field, struct
         if ((usage->type == EV_KEY) && (usage->code == 0)) /* Key 0 is "unassigned", not KEY_UNKNOWN */
                 return;
 
+        if ((usage->type == EV_ABS) && (field->flags & HID_MAIN_ITEM_RELATIVE) &&
+                        (usage->code == ABS_VOLUME)) {
+                int count = abs(value);
+                int direction = value > 0 ? KEY_VOLUMEUP : KEY_VOLUMEDOWN;
+                int i;
+
+                for (i = 0; i < count; i++) {
+                        input_event(input, EV_KEY, direction, 1);
+                        input_sync(input);
+                        input_event(input, EV_KEY, direction, 0);
+                        input_sync(input);
+                }
+                return;
+        }
+
         input_event(input, usage->type, usage->code, value);
 
         if ((field->flags & HID_MAIN_ITEM_RELATIVE) && (usage->type == EV_KEY))