diff options
| author | eric miao <eric.miao@marvell.com> | 2008-02-04 22:28:26 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-05 09:44:13 -0800 |
| commit | 9e60fdcf0c2905d7a8fc4cb2b3711ea5c5acaae1 (patch) | |
| tree | c90417ab0e2079d0355ffb553985d9a0f2348bab /include/linux/i2c | |
| parent | e58b9e2762a6ef99e20dba47aba21b911658541d (diff) | |
gpiolib: pca9539 i2c gpio expander support
This adds a new-style I2C driver with basic support for the sixteen bit
PCA9539 GPIO expanders. These chips have multiple registers, push-pull output
drivers, and (not supported in this patch) pin change interrupts.
Board-specific code must provide "pca9539_platform_data" with each chip's
"i2c_board_info". That provides the GPIO numbers to be used by that chip, and
callbacks for board-specific setup/teardown logic.
Derived from drivers/i2c/chips/pca9539.c (which has no current known users).
This is faster and simpler; it uses 16-bit register access, and cache the
OUTPUT and DIRECTION registers for fast access
Signed-off-by: eric miao <eric.miao@marvell.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Philipp Zabel <philipp.zabel@gmail.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ben Gardner <bgardner@wabtec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/i2c')
| -rw-r--r-- | include/linux/i2c/pca9539.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/i2c/pca9539.h b/include/linux/i2c/pca9539.h new file mode 100644 index 00000000000..611d84ab7a3 --- /dev/null +++ b/include/linux/i2c/pca9539.h @@ -0,0 +1,18 @@ +/* platform data for the PCA9539 16-bit I/O expander driver */ + +struct pca9539_platform_data { + /* number of the first GPIO */ + unsigned gpio_base; + + /* initial polarity inversion setting */ + uint16_t invert; + + void *context; /* param to setup/teardown */ + + int (*setup)(struct i2c_client *client, + unsigned gpio, unsigned ngpio, + void *context); + int (*teardown)(struct i2c_client *client, + unsigned gpio, unsigned ngpio, + void *context); +}; |