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authorSimon Glass <sjg@chromium.org>2014-10-04 11:29:43 -0600
committerSimon Glass <sjg@chromium.org>2014-10-23 19:29:52 -0600
commit6449a506d67b0374bf23a3833f15afa0c92a7a0e (patch)
tree73106b68362473dad809e2f54a97e7f3b6b3efa0 /drivers
parentb892d127ffd448e8adf21e9703c0c5107e2a7814 (diff)
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dm: gpio: Add gpio_get_function() and friends
Add helpers to the uclass to allow finding out the pin function. Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpio/gpio-uclass.c47
1 files changed, 47 insertions, 0 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)
{