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dm: gpio: Add gpio_get_function() and friends

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Add helpers to the uclass to allow finding out the pin function.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2014-10-04 11:29:43 -06:00
parent b892d127ff
commit 6449a506d6
2 changed files with 80 additions and 1 deletions
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47
drivers/gpio/gpio-uclass.c
View File

@ -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)
{

34
include/asm-generic/gpio.h
View File

@ -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 */
@ -95,6 +95,38 @@ 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
*