#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/gpio.h>
+#include <linux/of_gpio.h>
#include <linux/idr.h>
#include <linux/slab.h>
goto free_id;
}
- pdesc->value_sd = sysfs_get_dirent(dev->kobj.sd, "value");
+ pdesc->value_sd = sysfs_get_dirent(dev->kobj.sd, NULL, "value");
if (!pdesc->value_sd) {
ret = -ENODEV;
goto free_id;
unsigned long flags;
struct gpio_desc *desc;
int status = -EINVAL;
- char *ioname = NULL;
+ const char *ioname = NULL;
/* can't export until sysfs is available ... */
if (!gpio_class.p) {
struct device *dev;
dev = device_create(&gpio_class, desc->chip->dev, MKDEV(0, 0),
- desc, ioname ? ioname : "gpio%d", gpio);
+ desc, ioname ? ioname : "gpio%u", gpio);
if (!IS_ERR(dev)) {
status = sysfs_create_group(&dev->kobj,
&gpio_attr_group);
void gpio_unexport(unsigned gpio)
{
struct gpio_desc *desc;
- int status = -EINVAL;
+ int status = 0;
- if (!gpio_is_valid(gpio))
+ if (!gpio_is_valid(gpio)) {
+ status = -EINVAL;
goto done;
+ }
mutex_lock(&sysfs_lock);
clear_bit(FLAG_EXPORT, &desc->flags);
put_device(dev);
device_unregister(dev);
- status = 0;
} else
status = -ENODEV;
}
}
}
+ of_gpiochip_add(chip);
+
unlock:
spin_unlock_irqrestore(&gpio_lock, flags);
- if (status == 0)
- status = gpiochip_export(chip);
+
+ if (status)
+ goto fail;
+
+ status = gpiochip_export(chip);
+ if (status)
+ goto fail;
+
+ return 0;
fail:
/* failures here can mean systems won't boot... */
- if (status)
- pr_err("gpiochip_add: gpios %d..%d (%s) not registered\n",
- chip->base, chip->base + chip->ngpio - 1,
- chip->label ? : "generic");
+ pr_err("gpiochip_add: gpios %d..%d (%s) failed to register\n",
+ chip->base, chip->base + chip->ngpio - 1,
+ chip->label ? : "generic");
return status;
}
EXPORT_SYMBOL_GPL(gpiochip_add);
spin_lock_irqsave(&gpio_lock, flags);
+ of_gpiochip_remove(chip);
+
for (id = chip->base; id < chip->base + chip->ngpio; id++) {
if (test_bit(FLAG_REQUESTED, &gpio_desc[id].flags)) {
status = -EBUSY;
}
EXPORT_SYMBOL_GPL(gpiochip_remove);
+/**
+ * gpiochip_find() - iterator for locating a specific gpio_chip
+ * @data: data to pass to match function
+ * @callback: Callback function to check gpio_chip
+ *
+ * Similar to bus_find_device. It returns a reference to a gpio_chip as
+ * determined by a user supplied @match callback. The callback should return
+ * 0 if the device doesn't match and non-zero if it does. If the callback is
+ * non-zero, this function will return to the caller and not iterate over any
+ * more gpio_chips.
+ */
+struct gpio_chip *gpiochip_find(void *data,
+ int (*match)(struct gpio_chip *chip, void *data))
+{
+ struct gpio_chip *chip = NULL;
+ unsigned long flags;
+ int i;
+
+ spin_lock_irqsave(&gpio_lock, flags);
+ for (i = 0; i < ARCH_NR_GPIOS; i++) {
+ if (!gpio_desc[i].chip)
+ continue;
+
+ if (match(gpio_desc[i].chip, data)) {
+ chip = gpio_desc[i].chip;
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&gpio_lock, flags);
+
+ return chip;
+}
/* These "optional" allocation calls help prevent drivers from stomping
* on each other, and help provide better diagnostics in debugfs.
}
EXPORT_SYMBOL_GPL(gpio_direction_output);
+/**
+ * gpio_set_debounce - sets @debounce time for a @gpio
+ * @gpio: the gpio to set debounce time
+ * @debounce: debounce time is microseconds
+ */
+int gpio_set_debounce(unsigned gpio, unsigned debounce)
+{
+ unsigned long flags;
+ struct gpio_chip *chip;
+ struct gpio_desc *desc = &gpio_desc[gpio];
+ int status = -EINVAL;
+
+ spin_lock_irqsave(&gpio_lock, flags);
+
+ if (!gpio_is_valid(gpio))
+ goto fail;
+ chip = desc->chip;
+ if (!chip || !chip->set || !chip->set_debounce)
+ goto fail;
+ gpio -= chip->base;
+ if (gpio >= chip->ngpio)
+ goto fail;
+ status = gpio_ensure_requested(desc, gpio);
+ if (status < 0)
+ goto fail;
+
+ /* now we know the gpio is valid and chip won't vanish */
+
+ spin_unlock_irqrestore(&gpio_lock, flags);
+
+ might_sleep_if(extra_checks && chip->can_sleep);
+
+ return chip->set_debounce(chip, gpio, debounce);
+
+fail:
+ spin_unlock_irqrestore(&gpio_lock, flags);
+ if (status)
+ pr_debug("%s: gpio-%d status %d\n",
+ __func__, gpio, status);
+
+ return status;
+}
+EXPORT_SYMBOL_GPL(gpio_set_debounce);
/* I/O calls are only valid after configuration completed; the relevant
* "is this a valid GPIO" error checks should already have been done.