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If a BM type chip has iSerialNumber set to 0 in its EEPROM, an incorrect value is read from the bcdDevice field of the USB descriptor, making it look like an AM type chip. Attempt to correct this in ftdi_determine_type() by attempting to read the latency timer for an AM type chip if it has iSerialNumber set to 0. If that succeeds, assume it is a BM type chip. Currently, read_latency_timer() bails out without reading the latency timer for an AM type chip, so factor out the guts of read_latency_timer() into a new function _read_latency_timer() that attempts to read the latency timer regardless of chip type, and returns either the latency timer value or a negative error number. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Johan Hovold <johan@kernel.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.