diff options
Diffstat (limited to 'include/asm-generic')
-rw-r--r-- | include/asm-generic/gpio.h | 82 |
1 files changed, 74 insertions, 8 deletions
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h index 60539d8..f81b51a 100644 --- a/include/asm-generic/gpio.h +++ b/include/asm-generic/gpio.h @@ -26,8 +26,11 @@ */ /** - * Request a gpio. This should be called before any of the other functions - * are used on this gpio. + * Request a GPIO. This should be called before any of the other functions + * are used on this GPIO. + * + * Note: With driver model, the label is allocated so there is no need for + * the caller to preserve it. * * @param gp GPIO number * @param label User label for this GPIO @@ -80,7 +83,7 @@ int gpio_get_value(unsigned gpio); int gpio_set_value(unsigned gpio, int value); /* State of a GPIO, as reported by get_function() */ -enum { +enum gpio_func_t { GPIOF_INPUT = 0, GPIOF_OUTPUT, GPIOF_UNUSED, /* Not claimed */ @@ -93,6 +96,66 @@ enum { struct udevice; /** + * gpio_get_status() - get the current GPIO status as a string + * + * Obtain the current GPIO status as a string which can be presented to the + * user. A typical string is: + * + * "b4: in: 1 [x] sdmmc_cd" + * + * which means this is GPIO bank b, offset 4, currently set to input, current + * value 1, [x] means that it is requested and the owner is 'sdmmc_cd' + * + * @dev: Device to check + * @offset: Offset of device GPIO to check + * @buf: Place to put string + * @buffsize: Size of string including \0 + */ +int gpio_get_status(struct udevice *dev, int offset, char *buf, int buffsize); + +/** + * gpio_get_function() - get the current function for a GPIO pin + * + * Note this returns GPIOF_UNUSED if the GPIO is not requested. + * + * @dev: Device to check + * @offset: Offset of device GPIO to check + * @namep: If non-NULL, this is set to the nane given when the GPIO + * was requested, or -1 if it has not been requested + * @return -ENODATA if the driver returned an unknown function, + * -ENODEV if the device is not active, -EINVAL if the offset is invalid. + * GPIOF_UNUSED if the GPIO has not been requested. Otherwise returns the + * function from enum gpio_func_t. + */ +int gpio_get_function(struct udevice *dev, int offset, const char **namep); + +/** + * gpio_get_raw_function() - get the current raw function for a GPIO pin + * + * Note this does not return GPIOF_UNUSED - it will always return the GPIO + * driver's view of a pin function, even if it is not correctly set up. + * + * @dev: Device to check + * @offset: Offset of device GPIO to check + * @namep: If non-NULL, this is set to the nane given when the GPIO + * was requested, or -1 if it has not been requested + * @return -ENODATA if the driver returned an unknown function, + * -ENODEV if the device is not active, -EINVAL if the offset is invalid. + * Otherwise returns the function from enum gpio_func_t. + */ +int gpio_get_raw_function(struct udevice *dev, int offset, const char **namep); + +/** + * gpio_requestf() - request a GPIO using a format string for the owner + * + * This is a helper function for gpio_request(). It allows you to provide + * a printf()-format string for the GPIO owner. It calls gpio_request() with + * the string that is created + */ +int gpio_requestf(unsigned gpio, const char *fmt, ...) + __attribute__ ((format (__printf__, 2, 3))); + +/** * struct struct dm_gpio_ops - Driver model GPIO operations * * Refer to functions above for description. These function largely copy @@ -102,7 +165,7 @@ struct udevice; * new DM GPIO API, this should be really easy to flip over to the Linux * GPIO API-alike interface. * - * Akso it would be useful to standardise additional functions like + * Also it would be useful to standardise additional functions like * pullup, slew rate and drive strength. * * gpio_request)( and gpio_free() are optional - if NULL then they will @@ -115,7 +178,7 @@ struct udevice; * SoCs there may be many banks and therefore many devices all referring * to the different IO addresses within the SoC. * - * The uclass combines all GPIO devices togther to provide a consistent + * The uclass combines all GPIO devices together to provide a consistent * numbering from 0 to n-1, where n is the number of GPIOs in total across * all devices. Be careful not to confuse offset with gpio in the parameters. */ @@ -135,15 +198,13 @@ struct dm_gpio_ops { * @return current function - GPIOF_... */ int (*get_function)(struct udevice *dev, unsigned offset); - int (*get_state)(struct udevice *dev, unsigned offset, char *state, - int maxlen); }; /** * struct gpio_dev_priv - information about a device used by the uclass * * The uclass combines all active GPIO devices into a unified numbering - * scheme. To do this it maintains some private information aobut each + * scheme. To do this it maintains some private information about each * device. * * To implement driver model support in your GPIO driver, add a probe @@ -157,11 +218,14 @@ struct dm_gpio_ops { * @gpio_base: Base GPIO number for this device. For the first active device * this will be 0; the numbering for others will follow sequentially so that * @gpio_base for device 1 will equal the number of GPIOs in device 0. + * @name: Array of pointers to the name for each GPIO in this bank. The + * value of the pointer will be NULL if the GPIO has not been claimed. */ struct gpio_dev_priv { const char *bank_name; unsigned gpio_count; unsigned gpio_base; + char **name; }; /* Access the GPIO operations for a device */ @@ -193,4 +257,6 @@ const char *gpio_get_bank_info(struct udevice *dev, int *offset_count); int gpio_lookup_name(const char *name, struct udevice **devp, unsigned int *offsetp, unsigned int *gpiop); +int name_to_gpio(const char *name); + #endif /* _ASM_GENERIC_GPIO_H_ */ |