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| author |   Benjamin Tissoires <benjamin.tissoires@redhat.com> | 2017-03-02 10:48:23 -0800 |
|---|---|---|
| committer |   Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2017-03-25 10:37:29 -0700 |
| commit | 8eb92e5c91338eb19f86ffb2232258337ebf905b (patch) | |
| tree | 2945e2b7f324c0a3d8da4aebefa27b145ffb7d6f /drivers/input/mouse/synaptics.c | |
| parent | Input: psmouse - introduce notion of SMBus companions (diff) | |
| download | linux-dev-8eb92e5c91338eb19f86ffb2232258337ebf905b.tar.xz linux-dev-8eb92e5c91338eb19f86ffb2232258337ebf905b.zip | |
Input: psmouse - add support for SMBus companions
This provides glue between PS/2 devices that enumerate the RMI4 devices
and Elan touchpads to the RMI4 (or Elan) SMBus driver.
The SMBus devices keep their PS/2 connection alive. If the initialization
process goes too far (psmouse_activate called), the device disconnects
from the I2C bus and stays on the PS/2 bus, that is why we explicitly
disable PS/2 device reporting (by calling psmouse_deactivate) before
trying to register SMBus companion device.
The HID over I2C devices are enumerated through the ACPI DSDT, and
their PS/2 device also exports the InterTouch bit in the extended
capability 0x0C. However, the firmware keeps its I2C connection open
even after going further in the PS/2 initialization. We don't need
to take extra precautions with those device, especially because they
block their PS/2 communication when HID over I2C is used.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input/mouse/synaptics.c')
0 files changed, 0 insertions, 0 deletions