hwmon: (ucd9000) Add gpio chip interface
Add a struct gpio_chip and define some methods so that this device's I/O can be accessed via /sys/class/gpio. Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Andrew Jeffery <andrew@aj.id.au> Signed-off-by: Eddie James <eajames@linux.vnet.ibm.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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