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| author | David Brownell <dbrownell@users.sourceforge.net> | 2008-10-15 22:03:16 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-10-16 11:21:40 -0700 |
| commit | 35e8bb5175c1a6ff6253f1a2acb30bfe52a2f500 (patch) | |
| tree | 88a1e9695824f88efef3340fd53f8dbe576f5852 /include/asm-generic/gpio.h | |
| parent | 93a22f8b95756c53e80308820892119c910d2739 (diff) | |
| download | op-kernel-dev-35e8bb5175c1a6ff6253f1a2acb30bfe52a2f500.zip op-kernel-dev-35e8bb5175c1a6ff6253f1a2acb30bfe52a2f500.tar.gz | |
gpiolib: request/free hooks
Add a new internal mechanism to gpiolib to support low power
operations by letting gpio_chip instances see when their GPIOs
are in use. When no GPIOs are active, chips may be able to
enter lower powered runtime states by disabling clocks and/or
power domains.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: "Magnus Damm" <magnus.damm@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-generic/gpio.h')
| -rw-r--r-- | include/asm-generic/gpio.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h index 04cb1d1..81797ec 100644 --- a/include/asm-generic/gpio.h +++ b/include/asm-generic/gpio.h @@ -35,6 +35,10 @@ struct module; * @label: for diagnostics * @dev: optional device providing the GPIOs * @owner: helps prevent removal of modules exporting active GPIOs + * @request: optional hook for chip-specific activation, such as + * enabling module power and clock; may sleep + * @free: optional hook for chip-specific deactivation, such as + * disabling module power and clock; may sleep * @direction_input: configures signal "offset" as input, or returns error * @get: returns value for signal "offset"; for output signals this * returns either the value actually sensed, or zero @@ -67,6 +71,11 @@ struct gpio_chip { struct device *dev; struct module *owner; + int (*request)(struct gpio_chip *chip, + unsigned offset); + void (*free)(struct gpio_chip *chip, + unsigned offset); + int (*direction_input)(struct gpio_chip *chip, unsigned offset); int (*get)(struct gpio_chip *chip, |
