I've found a supposedly internal Dell email trail on the web
(http://www.spinics.net/lists/linux-input/msg44773.html), which says
something about alps.c (although it doesn't seem to be an Alps touchpad
after all?, cf. below) and protocols spoken by the touchpad, perhaps
this is of any help?

Quoting:
> As I mentioned earlier, the device is certainly not recognized as an
> ALPS device,
>
>     [  367.097253] input: ImPS/2 BYD TouchPad as 
> /devices/platform/i8042/serio1/input/input21
>
> If I `rmmod psmouse; modprobe psmouse dyndbg==pm` I find this,
>
>    [  714.520655] psmouse: psmouse serio1: cypress_ps2: send extension cmd 
> 0x00, [0 0 0 0]
>    [  714.748482] psmouse: psmouse serio1: cypress_ps2: Command 0x00 response 
> data (0x): 00 00 14
>    [  714.781858] psmouse: psmouse serio1: alps: E6 report: 00 00 64
>    [  714.804749] psmouse: psmouse serio1: alps: E7 report: 73 03 28
>    [  714.830829] psmouse: psmouse serio1: alps: EC report: 73 01 13
>    [  714.833568] psmouse: psmouse serio1: alps: Likely not an ALPS touchpad: 
> E7=73 03 28, EC=73 01 13
>    [  714.860923] psmouse: psmouse serio1: elantech: unexpected magic knock 
> result 0x00, 0x02, 0x64.
>    [  714.947527] psmouse: psmouse serio1: byd: BYD touchpad detected
>    [  715.869113] input: ImPS/2 BYD TouchPad as 
> /devices/platform/i8042/serio1/input/input24
>
> This seems like quite a hint.

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https://bugs.launchpad.net/bugs/1590590

Title:
  Touchpad not recognized on Dell Latitude E7470 Ultrabook

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