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Message-Id: <1394456094-21671-3-git-send-email-mika.westerberg@linux.intel.com>
Date: Mon, 10 Mar 2014 14:54:51 +0200
From: Mika Westerberg <mika.westerberg@...ux.intel.com>
To: Linus Walleij <linus.walleij@...aro.org>,
"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: Alexandre Courbot <gnurou@...il.com>,
Lan Tianyu <tianyu.lan@...el.com>,
Lv Zheng <lv.zheng@...el.com>, Alan Cox <alan.cox@...el.com>,
Mathias Nyman <mathias.nyman@...ux.intel.com>,
linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: [PATCH v2 2/5] gpio / ACPI: Allocate ACPI specific data directly in acpi_gpiochip_add()
We are going to add more ACPI specific data to accompany GPIO chip so
instead of allocating it per each use-case we allocate it once when
acpi_gpiochip_add() is called and release it when acpi_gpiochip_remove() is
called.
Doing this allows us to add more ACPI specific data by merely adding new
fields to struct acpi_gpio_chip.
In addition we embed evt_pins member directly to the structure instead of
having it as a pointer. This simplifies the code a bit since we don't need
to check against NULL.
Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
---
drivers/gpio/gpiolib-acpi.c | 106 ++++++++++++++++++++++++++------------------
1 file changed, 64 insertions(+), 42 deletions(-)
diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index b7db098ba060..5c0cf1d76c8b 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -26,6 +26,11 @@ struct acpi_gpio_evt_pin {
unsigned int irq;
};
+struct acpi_gpio_chip {
+ struct gpio_chip *chip;
+ struct list_head evt_pins;
+};
+
static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
{
if (!gc->dev)
@@ -81,14 +86,14 @@ static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data)
return IRQ_HANDLED;
}
-static void acpi_gpio_evt_dh(acpi_handle handle, void *data)
+static void acpi_gpio_chip_dh(acpi_handle handle, void *data)
{
/* The address of this function is used as a key. */
}
/**
* acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
- * @chip: gpio chip
+ * @acpi_gpio: ACPI GPIO chip
*
* ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are
* handled by ACPI event methods which need to be called from the GPIO
@@ -96,12 +101,12 @@ 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.
*/
-static void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
+static void acpi_gpiochip_request_interrupts(struct acpi_gpio_chip *acpi_gpio)
{
struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL};
+ struct gpio_chip *chip = acpi_gpio->chip;
struct acpi_resource *res;
acpi_handle handle, evt_handle;
- struct list_head *evt_pins = NULL;
acpi_status status;
unsigned int pin;
int irq, ret;
@@ -114,23 +119,7 @@ static void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
if (!handle)
return;
- status = acpi_get_event_resources(handle, &buf);
- if (ACPI_FAILURE(status))
- return;
-
- status = acpi_get_handle(handle, "_EVT", &evt_handle);
- if (ACPI_SUCCESS(status)) {
- evt_pins = kzalloc(sizeof(*evt_pins), GFP_KERNEL);
- if (evt_pins) {
- INIT_LIST_HEAD(evt_pins);
- status = acpi_attach_data(handle, acpi_gpio_evt_dh,
- evt_pins);
- if (ACPI_FAILURE(status)) {
- kfree(evt_pins);
- evt_pins = NULL;
- }
- }
- }
+ INIT_LIST_HEAD(&acpi_gpio->evt_pins);
/*
* If a GPIO interrupt has an ACPI event handler method, or _EVT is
@@ -167,14 +156,18 @@ static void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
data = ev_handle;
}
}
- if (!handler && evt_pins) {
+ if (!handler) {
struct acpi_gpio_evt_pin *evt_pin;
+ status = acpi_get_handle(handle, "_EVT", &evt_handle);
+ if (ACPI_FAILURE(status))
+ continue
+
evt_pin = kzalloc(sizeof(*evt_pin), GFP_KERNEL);
if (!evt_pin)
continue;
- list_add_tail(&evt_pin->node, evt_pins);
+ list_add_tail(&evt_pin->node, &acpi_gpio->evt_pins);
evt_pin->evt_handle = evt_handle;
evt_pin->pin = pin;
evt_pin->irq = irq;
@@ -197,39 +190,27 @@ static void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
/**
* acpi_gpiochip_free_interrupts() - Free GPIO _EVT ACPI event interrupts.
- * @chip: gpio chip
+ * @acpi_gpio: ACPI GPIO chip
*
* Free interrupts associated with the _EVT method for the given GPIO chip.
*
* The remaining ACPI event interrupts associated with the chip are freed
* automatically.
*/
-static void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
+static void acpi_gpiochip_free_interrupts(struct acpi_gpio_chip *acpi_gpio)
{
- acpi_handle handle;
- acpi_status status;
- struct list_head *evt_pins;
struct acpi_gpio_evt_pin *evt_pin, *ep;
+ struct gpio_chip *chip = acpi_gpio->chip;
if (!chip->dev || !chip->to_irq)
return;
- handle = ACPI_HANDLE(chip->dev);
- if (!handle)
- return;
-
- status = acpi_get_data(handle, acpi_gpio_evt_dh, (void **)&evt_pins);
- if (ACPI_FAILURE(status))
- return;
-
- list_for_each_entry_safe_reverse(evt_pin, ep, evt_pins, node) {
+ list_for_each_entry_safe_reverse(evt_pin, ep, &acpi_gpio->evt_pins,
+ node) {
devm_free_irq(chip->dev, evt_pin->irq, evt_pin);
list_del(&evt_pin->node);
kfree(evt_pin);
}
-
- acpi_detach_data(handle, acpi_gpio_evt_dh);
- kfree(evt_pins);
}
struct acpi_gpio_lookup {
@@ -312,10 +293,51 @@ struct gpio_desc *acpi_get_gpiod_by_index(struct device *dev, int index,
void acpi_gpiochip_add(struct gpio_chip *chip)
{
- acpi_gpiochip_request_interrupts(chip);
+ struct acpi_gpio_chip *acpi_gpio;
+ acpi_handle handle;
+ acpi_status status;
+
+ handle = ACPI_HANDLE(chip->dev);
+ if (!handle)
+ return;
+
+ acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL);
+ if (!acpi_gpio) {
+ dev_err(chip->dev,
+ "Failed to allocate memory for ACPI GPIO chip\n");
+ return;
+ }
+
+ acpi_gpio->chip = chip;
+
+ status = acpi_attach_data(handle, acpi_gpio_chip_dh, acpi_gpio);
+ if (ACPI_FAILURE(status)) {
+ dev_err(chip->dev, "Failed to attach ACPI GPIO chip\n");
+ kfree(acpi_gpio);
+ return;
+ }
+
+ acpi_gpiochip_request_interrupts(acpi_gpio);
}
void acpi_gpiochip_remove(struct gpio_chip *chip)
{
- acpi_gpiochip_free_interrupts(chip);
+ struct acpi_gpio_chip *acpi_gpio;
+ acpi_handle handle;
+ acpi_status status;
+
+ handle = ACPI_HANDLE(chip->dev);
+ if (!handle)
+ return;
+
+ status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
+ if (ACPI_FAILURE(status)) {
+ dev_warn(chip->dev, "Failed to retrieve ACPI GPIO chip\n");
+ return;
+ }
+
+ acpi_gpiochip_free_interrupts(acpi_gpio);
+
+ acpi_detach_data(handle, acpi_gpio_chip_dh);
+ kfree(acpi_gpio);
}
--
1.9.0
--
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