Commit Graph

4 Commits

Author SHA1 Message Date
Benjamin Tissoires dcce583792 HID: rmi: do not fetch more than 16 bytes in a query
A firmware bug is present on the XPS Haswell edition which silently
split the request in two responses when the caller ask for a read of
more than 16 bytes.
The FW sends the first 16 then the 4 next, but it says that it answered
the 20 bytes in the first report.

This occurs only on the retrieving of the min/max of X and Y of the F11
function.
We only use the first 10 bytes of the Ctrl register, so we can get only
those 10 bytes to prevent the bug from happening.

Resolves:
https://bugzilla.redhat.com/show_bug.cgi?id=1090161

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2014-05-13 16:42:50 +02:00
Andrew Duggan f15475c397 HID: rmi: check for the existence of some optional queries before reading query 12
The rmi4 spec defines some optional query registers in F11 which appear before
query 12. This patch checks for the existence of some of the lesser used queries to
 compute the location of query12 and all subsequent query registers.

Signed-off-by: Andrew Duggan <aduggan@synaptics.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2014-05-13 16:37:43 +02:00
Benjamin Tissoires b89f991af0 HID: rmi: do not stop the device at the end of probe
Well, this is embarrassing, if the device is stopped at the end of probe,
we get into big trouble.

This was a leftover of an attempt to be smart when sending the patch,
I deeply apologies.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2014-04-09 17:13:34 +02:00
Benjamin Tissoires 9fb6bf02e3 HID: rmi: introduce RMI driver for Synaptics touchpads
This driver add support for RMI4 over USB or I2C.
The current state is that it uses its own RMI4 implementation, but once
RMI4 is merged upstream, the driver will be a transport driver for the
RMI4 library.

Part of this driver should be considered as temporary. Most of the RMI4
processing and input handling will be deleted at some point.

I based my work on Andrew's regarding its port of RMI4 over HID (see
https://github.com/mightybigcar/synaptics-rmi4/tree/rmihid )
This repo presents how the driver may looks like at the end:
https://github.com/mightybigcar/synaptics-rmi4/blob/rmihid/drivers/input/rmi4/rmi_hid.c

Without this temporary solution, the workaround we gave to users
is to disable i2c-hid, which leads to disabling the touchscreen on the
XPS 11 and 12 (Haswell generation).

Related bugs:
https://bugzilla.redhat.com/show_bug.cgi?id=1048314
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1218973

Signed-off-by: Andrew Duggan <aduggan@synaptics.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2014-04-09 15:34:59 +02:00