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Update some comments

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This commit is contained in:
Gregory Nutt 2016-07-24 12:48:37 -06:00
parent 88cb41a0dc
commit eb94cc5419
2 changed files with 25 additions and 4 deletions
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8
drivers/ioexpander/gpio.c
View File

@ -92,7 +92,7 @@ static const struct file_operations g_gpio_drvrops =
* Name: gpio_handler
*
* Description:
* Standard character driver open method.
* GPIO interrupt callback function.
*
****************************************************************************/
@ -273,6 +273,12 @@ static int gpio_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
* Description:
* Register GPIO pin device driver.
*
* - Input pin types will be registered at /dev/gpinN
* - Output pin types will be registered at /dev/gpoutN
* - Interrupt pin types will be registered at /dev/gpintN
*
* Where N is the provided minor number in the range of 0-99.
*
****************************************************************************/
int gpio_pin_register(FAR struct gpio_dev_s *dev, int minor)

21
include/nuttx/ioexpander/gpio.h
View File

@ -85,7 +85,15 @@ enum gpio_pintype_e
typedef CODE int (*pin_interrupt_t)(FAR struct gpio_dev_s *dev);
/* Pin interface definition. */
/* Pin interface vtable definition. Instances of this vtable are read-only
* and may reside in FLASH.
*
* - go_read. Required for all all pin types.
* - go_write. Required only for the GPIO_OUTPUT_PIN pin type. Unused
* for other pin types may be NULL.
* - go_attach and gp_eanble. Required only the GPIO_INTERRUPT_PIN pin
* type. Unused for other pin types may be NULL.
*/
struct gpio_dev_s;
struct gpio_operations_s
@ -99,7 +107,7 @@ struct gpio_operations_s
CODE int (*go_enable)(FAR struct gpio_dev_s *dev, bool enable);
};
/* Pin interface definition. */
/* Pin interface definition. Must lie in writable memory. */
struct gpio_dev_s
{
@ -120,7 +128,7 @@ struct gpio_dev_s
FAR const struct gpio_operations_s *gp_ops;
/* Device specific, lower-half information may follow */
/* Device specific, lower-half information may follow. */
};
/****************************************************************************
@ -141,6 +149,13 @@ extern "C"
* Description:
* Register GPIO pin device driver.
*
* - Input pin types will be registered at /dev/gpinN
* - Output pin types will be registered at /dev/gpoutN
* - Interrupt pin types will be registered at /dev/gpintN
*
* Where N is the provided minor number in the range of 0-99.
*
*
****************************************************************************/
int gpio_pin_register(FAR struct gpio_dev_s *dev, int minor);