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| author | Andrew Duggan <aduggan@synaptics.com> | 2015-02-24 17:36:49 -0800 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2015-02-25 15:26:44 +0100 |
| commit | 05ba999fcabb747214d177279de55f00a74850d4 (patch) | |
| tree | b317b87cd4941357810a899725b515f4fcff5a63 /drivers/hid | |
| parent | dd8df28459dcad4da5dec94d12801b149a895c36 (diff) | |
| download | linux-stable-05ba999fcabb747214d177279de55f00a74850d4.tar.gz linux-stable-05ba999fcabb747214d177279de55f00a74850d4.tar.bz2 linux-stable-05ba999fcabb747214d177279de55f00a74850d4.zip | |
HID: rmi: disable dribble packets on Synaptics touchpads
When a finger is lifted from a Synaptics touchpad the firmware will continue
to interrupts for up to a second. These additional interrupts are know and
dribble interrupts. Since the data read from the touchpad does not change
the input subsystem only reports a single event. This makes the servicing of
dribble interrupts on Linux unnecessary. This patch simply disables dribble
interupts when configuring the touchpad.
Signed-off-by: Andrew Duggan <aduggan@synaptics.com>
Tested-by: Gabriele Mazzotta <gabriele.mzt@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid')
| -rw-r--r-- | drivers/hid/hid-rmi.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/hid/hid-rmi.c b/drivers/hid/hid-rmi.c index e2a43a1d3aa3..6e74eae6b652 100644 --- a/drivers/hid/hid-rmi.c +++ b/drivers/hid/hid-rmi.c @@ -751,6 +751,7 @@ static int rmi_populate_f11(struct hid_device *hdev) bool has_gestures; bool has_rel; bool has_data40 = false; + bool has_dribble = false; unsigned x_size, y_size; u16 query_offset; @@ -792,6 +793,14 @@ static int rmi_populate_f11(struct hid_device *hdev) has_rel = !!(buf[0] & BIT(3)); has_gestures = !!(buf[0] & BIT(5)); + ret = rmi_read(hdev, data->f11.query_base_addr + 5, buf); + if (ret) { + hid_err(hdev, "can not get absolute data sources: %d.\n", ret); + return ret; + } + + has_dribble = !!(buf[0] & BIT(4)); + /* * At least 4 queries are guaranteed to be present in F11 * +1 for query 5 which is present since absolute events are @@ -908,6 +917,16 @@ static int rmi_populate_f11(struct hid_device *hdev) data->max_x = buf[6] | (buf[7] << 8); data->max_y = buf[8] | (buf[9] << 8); + if (has_dribble) { + buf[0] = buf[0] & ~BIT(6); + ret = rmi_write(hdev, data->f11.control_base_addr, buf); + if (ret) { + hid_err(hdev, "can not write to control reg 0: %d.\n", + ret); + return ret; + } + } + return 0; } |