The patch titled
gpiolib: introduce chip addition/removal notifier
has been added to the -mm tree. Its filename is
gpiolib-introduce-chip-addition-removal-notifier.patch
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------------------------------------------------------
Subject: gpiolib: introduce chip addition/removal notifier
From: Anton Vorontsov <avorontsov@xxxxxxxxxxxxx>
Some platforms (e.g. OpenFirmware) want to know when a particular chip
added or removed, so that the platforms could add their specifics for
non-platform devices, like I2C or SPI GPIO chips.
This patch implements the notifier for chip addition and removal events.
Signed-off-by: Anton Vorontsov <avorontsov@xxxxxxxxxxxxx>
Cc: Grant Likely <grant.likely@xxxxxxxxxxxx>
Cc: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
Cc: Bill Gatliff <bgat@xxxxxxxxxxxxxxx>
Cc: Dmitry Eremin-Solenikov <dbaryshkov@xxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Jean Delvare <khali@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/gpio/gpiolib.c | 14 ++++++++++++++
include/asm-generic/gpio.h | 8 ++++++++
2 files changed, 22 insertions(+)
diff -puN drivers/gpio/gpiolib.c~gpiolib-introduce-chip-addition-removal-notifier drivers/gpio/gpiolib.c
--- a/drivers/gpio/gpiolib.c~gpiolib-introduce-chip-addition-removal-notifier
+++ a/drivers/gpio/gpiolib.c
@@ -9,6 +9,7 @@
#include <linux/seq_file.h>
#include <linux/gpio.h>
#include <linux/idr.h>
+#include <linux/notifier.h>
/* Optional implementation infrastructure for GPIO interfaces.
@@ -1033,6 +1034,9 @@ static inline void gpiochip_unexport(str
#endif /* CONFIG_GPIO_SYSFS */
+BLOCKING_NOTIFIER_HEAD(gpio_notifier);
+EXPORT_SYMBOL_GPL(gpio_notifier);
+
/**
* gpiochip_add() - register a gpio_chip
* @chip: the chip to register, with chip->base initialized
@@ -1107,6 +1111,9 @@ 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);
@@ -1123,6 +1130,13 @@ int gpiochip_remove(struct gpio_chip *ch
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++) {
diff -puN include/asm-generic/gpio.h~gpiolib-introduce-chip-addition-removal-notifier include/asm-generic/gpio.h
--- a/include/asm-generic/gpio.h~gpiolib-introduce-chip-addition-removal-notifier
+++ a/include/asm-generic/gpio.h
@@ -4,6 +4,7 @@
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
+#include <linux/notifier.h>
#ifdef CONFIG_GPIOLIB
@@ -234,4 +235,11 @@ static inline void gpio_unexport(unsigne
}
#endif /* CONFIG_GPIO_SYSFS */
+enum gpio_notify_msg {
+ GPIO_NOTIFY_CHIP_ADDED = 0,
+ GPIO_NOTIFY_CHIP_REMOVE = 1,
+};
+
+extern struct blocking_notifier_head gpio_notifier;
+
#endif /* _ASM_GENERIC_GPIO_H */
_
Patches currently in -mm which might be from avorontsov@xxxxxxxxxxxxx are
linux-next.patch
gpio-add-driver-for-max7300-i2c-gpio-extender.patch
gpiolib-introduce-chip-addition-removal-notifier.patch
of-gpio-add-support-for-two-stage-registration-for-the-of_gpio_chips.patch
of-gpio-implement-gpiolib-notifier-hooks.patch
of-gpio-implement-gpiolib-notifier-hooks-fix.patch
powerpc-mcu_mpc8349emitx-remove-of-gpio-handling-stuff.patch
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