Input: Switch i2c drivers back to use .probe()

After commit b8a1a4cd5a98 ("i2c: Provide a temporary .probe_new()
call-back type"), all drivers being converted to .probe_new() and then
03c835f498b5 ("i2c: Switch .probe() to not take an id parameter") convert
back to (the new) .probe() to be able to eventually drop .probe_new() from
struct i2c_driver.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20230517164645.162294-1-u.kleine-koenig@pengutronix.de
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Input: hynitron_cstxxx - initialize tmp to 0 to fix uninitialized variable issue

In the very unlikely event the cst3xx_i2c_write() fails inside of the
cst3xx_bootloader_enter() function 5 times in a row, the uninitalized
value of tmp will get compared to CST3XX_BOOTLDR_CHK_VAL. Initialize
the value of tmp to 0 so that in this unlikely event we are comparing
0 instead of an uninitalized variable.

Fixes: 66603243f528 ("Input: add driver for Hynitron cstxxx touchscreens")

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Reported-by: Dan Carpenter <error27@gmail.com>
Link: https://lore.kernel.org/r/20221117195921.2291-1-macroalpha82@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Input: add driver for Hynitron cstxxx touchscreens

Add support for the Hynitron cst3xx controller found on devices such
as the Anbernic RG353P and RG353V (the Hynitron CST340). This driver
was built from sources provided by Hynitron to Anbernic (possibly
via Rockchip as an intermediary) and marked as GPLv2 in the code.
This driver was written strictly for the cst3xx series, but in
most places was left somewhat generic so support could be easily
added to other devices in the future.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Link: https://lore.kernel.org/r/20221028202636.14341-4-macroalpha82@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>