platform/x86/siemens: simatic-ipc-batt: Convert to platform remove callback returning void

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20230927081040.2198742-25-u.kleine-koenig@pengutronix.de
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

platform/x86/siemens: simatic-ipc-batt: Simplify simatic_ipc_batt_remove()

Instead of unconditionally returning zero, let simatic_ipc_batt_remove()
return no value. This is a preparation to convert the drivers using this
function to struct platform_driver::remove_new().

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20230927081040.2198742-24-u.kleine-koenig@pengutronix.de
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

platform/x86/siemens: simatic-ipc-batt: fix logical error for BX-59A

The variable "priv.devmode" is missing from if statement that leads
to a logical error. Add the missing variable to the if condition.

Fixes: c56beff20375 ("platform/x86/siemens: simatic-ipc-batt: add support for module BX-59A")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202308010001.BGYCSQrl-lkp@intel.com/
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: xingtong.wu <xingtong.wu@siemens.com>
Link: https://lore.kernel.org/r/20430802173844.2483-1-xingtong_wu@163.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

platform/x86/siemens: simatic-ipc-batt: fix wrong pointer pass to PTR_ERR()

Fix wrong pointer pass to PTR_ERR() if devm_gpiod_get_index() fails.

Fixes: 917f54340794 ("platform/x86: simatic-ipc: add CMOS battery monitoring")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230809081227.1221267-1-yangyingliang@huawei.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

platform/x86/siemens: simatic-ipc-batt: add support for module BX-59A

This is used for the Siemens Simatic IPC BX-59A, which
can monitor the voltage of the CMOS battery with two bits
that indicate low or empty state

Signed-off-by: xingtong.wu <xingtong.wu@siemens.com>
Link: https://lore.kernel.org/r/20230731072148.4781-1-xingtong_wu@163.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

platform/x86/siemens: simatic-ipc-batt: fix bat reading in BX_21A

There was a case missing in a switch statement which lead to that model
not actually reading the GPIOs. That switch statement got simplified
now. Additionally on that model we need to initialize one pin
differently. As a drive-by finding also add a missing newline.

Fixes: 917f54340794 ("platform/x86: simatic-ipc: add CMOS battery monitoring")
Reported-by: Henning Schild <henning.schild@siemens.com>
Signed-off-by: xingtong.wu <xingtong.wu@siemens.com>
Signed-off-by: Henning Schild <henning.schild@siemens.com>
Link: https://lore.kernel.org/r/20230728083651.19747-1-henning.schild@siemens.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

platform/x86: Move all simatic ipc drivers to the subdirectory siemens

With more files around move everything to a subdirectory. Users will
only see the several options once they enable the main one.

Suggested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Henning Schild <henning.schild@siemens.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230719153518.13073-4-henning.schild@siemens.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>