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| author | Jiri Kosina <jkosina@suse.cz> | 2007-07-04 16:45:59 +0200 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2007-07-09 14:13:37 +0200 |
| commit | 2c1d8aea2ca76df1b1de2aed23e3ceda2a044ed1 (patch) | |
| tree | 84441a52707b1239e8395b282b986dfb5a9cd3f1 /drivers | |
| parent | 3c5f4b25f3552c9bcb52eb956753a3c8140480b7 (diff) | |
| download | lwn-2c1d8aea2ca76df1b1de2aed23e3ceda2a044ed1.tar.gz lwn-2c1d8aea2ca76df1b1de2aed23e3ceda2a044ed1.zip | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/hid/hid-input.c | 25 |
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)) |