diff options
| -rw-r--r-- | drivers/gpio/gpio-uclass.c | 47 | ||||
| -rw-r--r-- | include/asm-generic/gpio.h | 34 |
2 files changed, 80 insertions, 1 deletions
diff --git a/drivers/gpio/gpio-uclass.c b/drivers/gpio/gpio-uclass.c index e11c5a6..04b7b16 100644 --- a/drivers/gpio/gpio-uclass.c +++ b/drivers/gpio/gpio-uclass.c @@ -283,6 +283,53 @@ const char *gpio_get_bank_info(struct udevice *dev, int *bit_count) return priv->bank_name; } +static const char * const gpio_function[GPIOF_COUNT] = { + "input", + "output", + "unused", + "unknown", + "func", +}; + +int get_function(struct udevice *dev, int offset, bool skip_unused, + const char **namep) +{ + struct gpio_dev_priv *uc_priv = dev->uclass_priv; + struct dm_gpio_ops *ops = gpio_get_ops(dev); + + BUILD_BUG_ON(GPIOF_COUNT != ARRAY_SIZE(gpio_function)); + if (!device_active(dev)) + return -ENODEV; + if (offset < 0 || offset >= uc_priv->gpio_count) + return -EINVAL; + if (namep) + *namep = uc_priv->name[offset]; + if (skip_unused && !uc_priv->name[offset]) + return GPIOF_UNUSED; + if (ops->get_function) { + int ret; + + ret = ops->get_function(dev, offset); + if (ret < 0) + return ret; + if (ret >= ARRAY_SIZE(gpio_function)) + return -ENODATA; + return ret; + } + + return GPIOF_UNKNOWN; +} + +int gpio_get_function(struct udevice *dev, int offset, const char **namep) +{ + return get_function(dev, offset, true, namep); +} + +int gpio_get_raw_function(struct udevice *dev, int offset, const char **namep) +{ + return get_function(dev, offset, false, namep); +} + /* We need to renumber the GPIOs when any driver is probed/removed */ static int gpio_renumber(struct udevice *removed_dev) { diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h index 128249e..7104454 100644 --- a/include/asm-generic/gpio.h +++ b/include/asm-generic/gpio.h @@ -83,7 +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 */ @@ -96,6 +96,38 @@ enum { struct udevice; /** + * 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); + +/** * struct struct dm_gpio_ops - Driver model GPIO operations * * Refer to functions above for description. These function largely copy |