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MCP2221 has 4 pins that can be used as GPIO or configured for alternate functionality such as clock generation and IRQ detection. This patch adds support for GPIO functionality. To set direction of a pin or to toggle its state after it has been configured as GPIO, driver sends command to mcp2221 and parses response received from mcp2221. Based on this response either 0 or appropriate error code is returned to GPIO framework. To get the direction or current state of a pin, driver sends command and read response from the device. Based on the response received from device direction or value is sent to the GPIO framework. Command from driver to mcp2221 device are output report. Response received from mcp2221 is input report. Datasheet (page 45-48) contains details about how to decode the response received from device: http://ww1.microchip.com/downloads/en/DeviceDoc/20005565B.pdf Signed-off-by: Rishi Gupta <gupt21@gmail.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz> |
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| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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.