gpio / ACPI: register to ACPI events automatically

Instead of asking each driver to register to ACPI events we can just call
acpi_gpiochip_register_interrupts() for each chip that has an ACPI handle.
The function checks chip->to_irq and if it is set to NULL (a GPIO driver
that doesn't do interrupts) the function does nothing.

We also add the a new header drivers/gpio/gpiolib.h that is used for
functions internal to gpiolib and add ACPI GPIO chip registering functions
to that header.

Once that is done we can remove call to acpi_gpiochip_register_interrupts()
from its only user, pinctrl-baytrail.c

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

3 files changed, 39 insertions, 4 deletions

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index 137d20c70afe..739b72b6731a 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -94,7 +94,7 @@ static void acpi_gpio_evt_dh(acpi_handle handle, void *data)
  * gpio pins have acpi event methods and assigns interrupt handlers that calls
  * the acpi event methods for those pins.
  */
-void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
+static void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
 {
 	struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL};
 	struct acpi_resource *res;
@@ -192,7 +192,6 @@ void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
 				irq);
 	}
 }
-EXPORT_SYMBOL(acpi_gpiochip_request_interrupts);
 
 /**
  * acpi_gpiochip_free_interrupts() - Free GPIO _EVT ACPI event interrupts.
@@ -203,7 +202,7 @@ EXPORT_SYMBOL(acpi_gpiochip_request_interrupts);
  * The remaining ACPI event interrupts associated with the chip are freed
  * automatically.
  */
-void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
+static void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
 {
 	acpi_handle handle;
 	acpi_status status;
@@ -230,7 +229,6 @@ void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
 	acpi_detach_data(handle, acpi_gpio_evt_dh);
 	kfree(evt_pins);
 }
-EXPORT_SYMBOL(acpi_gpiochip_free_interrupts);
 
 struct acpi_gpio_lookup {
 	struct acpi_gpio_info info;
@@ -310,3 +308,13 @@ struct gpio_desc *acpi_get_gpiod_by_index(struct device *dev, int index,
 	return lookup.desc ? lookup.desc : ERR_PTR(-ENOENT);
 }
 EXPORT_SYMBOL_GPL(acpi_get_gpiod_by_index);
+
+void acpi_gpiochip_add(struct gpio_chip *chip)
+{
+	acpi_gpiochip_request_interrupts(chip);
+}
+
+void acpi_gpiochip_remove(struct gpio_chip *chip)
+{
+	acpi_gpiochip_free_interrupts(chip);
+}
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index c0b06a9adad9..0de4069e33ab 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -16,6 +16,8 @@
 #include <linux/acpi.h>
 #include <linux/gpio/driver.h>
 
+#include "gpiolib.h"
+
 #define CREATE_TRACE_POINTS
 #include <trace/events/gpio.h>
 
@@ -1226,6 +1228,7 @@ int gpiochip_add(struct gpio_chip *chip)
 #endif
 
 	of_gpiochip_add(chip);
+	acpi_gpiochip_add(chip);
 
 	if (status)
 		goto fail;
@@ -1267,6 +1270,7 @@ int gpiochip_remove(struct gpio_chip *chip)
 
 	gpiochip_remove_pin_ranges(chip);
 	of_gpiochip_remove(chip);
+	acpi_gpiochip_remove(chip);
 
 	for (id = 0; id < chip->ngpio; id++) {
 		if (test_bit(FLAG_REQUESTED, &chip->desc[id].flags)) {
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
new file mode 100644
index 000000000000..2ed23ab8298c
--- /dev/null
+++ b/drivers/gpio/gpiolib.h
@@ -0,0 +1,23 @@
+/*
+ * Internal GPIO functions.
+ *
+ * Copyright (C) 2013, Intel Corporation
+ * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef GPIOLIB_H
+#define GPIOLIB_H
+
+#ifdef CONFIG_ACPI
+void acpi_gpiochip_add(struct gpio_chip *chip);
+void acpi_gpiochip_remove(struct gpio_chip *chip);
+#else
+static inline void acpi_gpiochip_add(struct gpio_chip *chip) { }
+static inline void acpi_gpiochip_remove(struct gpio_chip *chip) { }
+#endif
+
+#endif /* GPIOLIB_H */