3ce868bb05
The datasheet mentions that the suspend mode is toggled by reading the suspend register. The reading returns value 0xFF if the system was in suspend mode, otherwise it returns value 0x00. The bma220_deinit() function does up to 2 reads, in case the device was in suspend mode, which suggests a level of paranoia that makes the logic in bma220_suspend() and bma220_resume() look insufficient. This change implements a bma220_power() function which does up to 2 reads of the suspend register to make sure that the chip enters a desired (suspended or normal) mode. If the transition fails, then -EBUSY is returned. Since only a reference to SPI device is required, we can remove the spi_set_drvdata() call and get the SPI device object from the base device object in the suspend/resume routines. Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com> Link: https://lore.kernel.org/r/20210625140137.362282-2-aardelean@deviqon.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.