Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=2c1d8aea2ca76df1b1de2aed23e3ceda2a044ed1
Commit: 2c1d8aea2ca76df1b1de2aed23e3ceda2a044ed1
Parent: 3c5f4b25f3552c9bcb52eb956753a3c8140480b7
Author: Jiri Kosina <[EMAIL PROTECTED]>
AuthorDate: Wed Jul 4 16:45:59 2007 +0200
Committer: Jiri Kosina <[EMAIL PROTECTED]>
CommitDate: Mon Jul 9 14:13:37 2007 +0200
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 <[EMAIL PROTECTED]>
Signed-off-by: Jiri Kosina <[EMAIL PROTECTED]>
---
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 60de16a..bf7e307 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))
-
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