[PATCH] Input: synaptics - add PNP IDs for Dell XPS models to forcepad

[Kim Phillips]

This patch is the result of seeing this message:

psmouse serio1: synaptics: Your touchpad (PNP: DLL087c PNP0f13) says it can support a different bus. If i2c-hid and hid-rmi are not used, you might want to try setting psmouse.synaptics_intertouch to 1 and report this to linux-input@xxxxxxxxxxxxxxxx

If I set psmouse.synaptics_intertouch=1, or add the PNP ID to
smbus_pnp_ids, the touchpad continues to work, and the above message
goes away, but we now get:

psmouse serio1: synaptics: Trying to set up SMBus access
psmouse serio1: synaptics: SMbus companion is not ready yet

With this patch applied, i.e., the PNP IDs are added to the forcepad
array, the touchpad continues to work and all of the above messages
disappear.

Tested on a Dell XPS 15 9570.  The other IDs - for Dell XPS 13
9350/9360/9370 and XPS 15 9550/9560 - were obtained by searching
for the model numbers and "says it can support a different bus".
E.g, this is one such instance:

https://lkml.org/lkml/2018/2/15/52

Cc: Paul Menzel <pmenzel@xxxxxxxxxxxxx>
Cc: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Cc: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
Cc: linux-input@xxxxxxxxxxxxxxx
Signed-off-by: Kim Phillips <kim@xxxxxxxxxxxxxxx>
---
With or without this patch, I'm seeing a problem where when the XPS 15
comes out of a resume, and without even touching the touchpad, I notice
about 600 interrupts per second firing on the "IR-IO-APIC   51-fasteoi
SYNA2393:00" line in /proc/interrupts.  If I start using the touchpad,
then leave it alone, I check if there are still interrupts firing, and
they have indeed stopped.  This adversely affects my battery life when
using an external mouse.  Any ideas on how to debug the situation?
Could it be related to the 'vdd not found' messages?:

$ dmesg | grep -C 1 -i syna
probe of 1-12 returned 1 after 2343 usecs
psmouse serio1: synaptics: queried max coordinates: x [..5664], y [..4646]
psmouse serio1: synaptics: queried min coordinates: x [1278..], y [1206..]
psmouse serio1: synaptics: Touchpad model: 1, fw: 8.2, id: 0x1e2b1, caps: 0xf00123/0x840300/0x12e800/0x0, board id: 3125, fw id: 2378871
input: SynPS/2 Synaptics TouchPad as /devices/platform/i8042/serio1/input/input6
probe of serio1 returned 1 after 939332 usecs
--
probe of idma64.1 returned 1 after 72 usecs
i2c_hid i2c-SYNA2393:00: i2c-SYNA2393:00 supply vdd not found, using dummy regulator
i2c_hid i2c-SYNA2393:00: Linked as a consumer to regulator.0
i2c_hid i2c-SYNA2393:00: i2c-SYNA2393:00 supply vddl not found, using dummy regulator
ath10k_pci 0000:3b:00.0: qca6174 hw3.2 target 0x05030000 chip_id 0x00340aff sub 1a56:1535
--
ath10k_pci 0000:3b:00.0: firmware ver WLAN.RM.4.4.1-00079-QCARMSWPZ-1 api 6 features wowlan,ignore-otp crc32 fd869beb
probe of i2c-SYNA2393:00 returned 1 after 23978 usecs
ath10k_pci 0000:3b:00.0: board_file api 2 bmi_id N/A crc32 20d869c3
--
probe of 0018:056A:488F.0001 returned 1 after 1366 usecs
input: SYNA2393:00 06CB:7A13 Mouse as /devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-10/i2c-SYNA2393:00/0018:06CB:7A13.0002/input/input23
input: SYNA2393:00 06CB:7A13 Touchpad as /devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-10/i2c-SYNA2393:00/0018:06CB:7A13.0002/input/input24
hid-generic 0018:06CB:7A13.0002: input,hidraw1: I2C HID v1.00 Mouse [SYNA2393:00 06CB:7A13] on i2c-SYNA2393:00
probe of 0018:06CB:7A13.0002 returned 1 after 320 usecs
--
probe of 0018:06CB:7A13.0002 returned 0 after 5 usecs
input: SYNA2393:00 06CB:7A13 Touchpad as /devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-10/i2c-SYNA2393:00/0018:06CB:7A13.0002/input/input27
hid-multitouch 0018:06CB:7A13.0002: input,hidraw1: I2C HID v1.00 Mouse [SYNA2393:00 06CB:7A13] on i2c-SYNA2393:00
probe of 0018:06CB:7A13.0002 returned 1 after 25104 usecs

 drivers/input/mouse/synaptics.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index b6da0c1267e3..e3fb4b9346c0 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -185,6 +185,12 @@ static const char * const smbus_pnp_ids[] = {
 };
 
 static const char * const forcepad_pnp_ids[] = {
+	"DLL06e4", /* Dell XPS 15 9550 */
+	"DLL0704", /* Dell XPS 13 9350 */
+	"DLL075b", /* Dell XPS 13 9360 */
+	"DLL07be", /* Dell XPS 15 9560 */
+	"DLL07e6", /* Dell XPS 13 9370 */
+	"DLL087c", /* Dell XPS 15 9570 */
 	"SYN300D",
 	"SYN3014",
 	NULL
-- 
2.20.1