From mboxrd@z Thu Jan  1 00:00:00 1970
From: sergk sergk2mail <sergk.admin@gmail.com>
Subject: Re: How to use ACPI for touchscreen
Date: Wed, 2 Mar 2016 19:00:01 +0000
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To: Gregor Riepl <onitake@gmail.com>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>, linux-input@vger.kernel.org

Hi Gregor,

Actually if you look for the code of atmel_mxt_ts - all actions are in probe.
Also simple experimental like:
echo maxtouch 0x48 > /sys/bus/i2c/i2c-4/new_device
you got the same as in my case with modified your driver:

Mar 02 18:51:39 archiso kernel: device: '4-0048': device_add
Mar 02 18:51:39 archiso kernel: bus: 'i2c': add device 4-0048
Mar 02 18:51:39 archiso kernel: PM: Adding info for i2c:4-0048
Mar 02 18:51:39 archiso kernel: i2c i2c-4: new_device: Instantiated
device maxtouch at 0x48
Mar 02 18:51:39 archiso kernel: bus: 'i2c': add driver atmel_mxt_ts
Mar 02 18:51:39 archiso kernel: bus: 'i2c': driver_probe_device:
matched device 4-0048 with driver atmel_mxt_ts
Mar 02 18:51:39 archiso kernel: bus: 'i2c': really_probe: probing
driver atmel_mxt_ts with device 4-0048
Mar 02 18:51:39 archiso kernel: atmel_mxt_ts 4-0048: no default pinctrl state
Mar 02 18:51:39 archiso kernel: devices_kset: Moving 4-0048 to end of list
Mar 02 18:51:39 archiso kernel: atmel_mxt_ts 4-0048: No platform data specified
Mar 02 18:51:39 archiso kernel: atmel_mxt_ts: probe of 4-0048 faile

Regards,
                 Serge Kolotylo.

PS: it will be really good if here will be someone who is fluent in
Chinese and could directly read spec for Chipone and translate it to
us.