@@ -1103,6 +1107,9 @@ fail:
pr_err("gpiochip_add: gpios %d..%d (%s) not registered\n",
chip->base, chip->base + chip->ngpio - 1,
chip->label ? : "generic");
+ else
+ blocking_notifier_call_chain(&gpio_notifier,
+ GPIO_NOTIFY_CHIP_ADDED, chip);
return status;
}
EXPORT_SYMBOL_GPL(gpiochip_add);
@@ -1119,6 +1126,13 @@ int gpiochip_remove(struct gpio_chip *chip)
int status = 0;
unsigned id;
+ /* Ask external subsystems to release the chip. */
+ status = blocking_notifier_call_chain(&gpio_notifier,
+ GPIO_NOTIFY_CHIP_REMOVE, chip);
+ status = notifier_to_errno(status);
+ if (status)
+ return status;
+
spin_lock_irqsave(&gpio_lock, flags);
for (id = chip->base; id < chip->base + chip->ngpio; id++) {
With the call_chain helper:
@@ -1029,6 +1030,16 @@ static inline void gpiochip_unexport(struct gpio_chip *chip)
#endif /* CONFIG_GPIO_SYSFS */
+static int gpio_call_chain(struct gpio_chip *chip, enum gpio_notify_msg msg)
+{
+ int ret = blocking_notifier_call_chain(&gpio_notifier, msg, chip);
+
+ return notifier_to_errno(ret);
+}
+
/**
* gpiochip_add() - register a gpio_chip
* @chip: the chip to register, with chip->base initialized
@@ -1103,6 +1114,9 @@ fail:
pr_err("gpiochip_add: gpios %d..%d (%s) not registered\n",
chip->base, chip->base + chip->ngpio - 1,