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-rw-r--r--drivers/gpio/gpiolib-acpi.c214
-rw-r--r--drivers/gpio/gpiolib.c3
2 files changed, 131 insertions, 86 deletions
diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index be09e7526890..092ea4e5c9a8 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -70,9 +70,9 @@ static struct gpio_desc *acpi_get_gpiod(char *path, int pin)
static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
{
- acpi_handle handle = data;
+ struct acpi_gpio_event *event = data;
- acpi_evaluate_object(handle, NULL, NULL, NULL);
+ acpi_evaluate_object(event->handle, NULL, NULL, NULL);
return IRQ_HANDLED;
}
@@ -91,111 +91,148 @@ 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
- * @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
- * chip's interrupt handler. acpi_gpiochip_request_interrupts finds out which
- * 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 acpi_gpio_chip *acpi_gpio)
+static acpi_status acpi_gpiochip_request_interrupt(struct acpi_resource *ares,
+ void *context)
{
- struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL};
+ struct acpi_gpio_chip *acpi_gpio = context;
struct gpio_chip *chip = acpi_gpio->chip;
- struct acpi_resource *res;
+ struct acpi_resource_gpio *agpio;
acpi_handle handle, evt_handle;
- acpi_status status;
- unsigned int pin;
- int irq, ret;
- char ev_name[5];
+ struct acpi_gpio_event *event;
+ irq_handler_t handler = NULL;
+ struct gpio_desc *desc;
+ unsigned long irqflags;
+ int ret, pin, irq;
- if (!chip->dev || !chip->to_irq)
- return;
+ if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
+ return AE_OK;
+
+ agpio = &ares->data.gpio;
+ if (agpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT)
+ return AE_OK;
handle = ACPI_HANDLE(chip->dev);
- if (!handle)
- return;
+ pin = agpio->pin_table[0];
+
+ if (pin <= 255) {
+ char ev_name[5];
+ sprintf(ev_name, "_%c%02X",
+ agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L',
+ pin);
+ if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle)))
+ handler = acpi_gpio_irq_handler;
+ }
+ if (!handler) {
+ if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle)))
+ handler = acpi_gpio_irq_handler_evt;
+ }
+ if (!handler)
+ return AE_BAD_PARAMETER;
- INIT_LIST_HEAD(&acpi_gpio->events);
+ desc = gpiochip_get_desc(chip, pin);
+ if (IS_ERR(desc)) {
+ dev_err(chip->dev, "Failed to get GPIO descriptor\n");
+ return AE_ERROR;
+ }
- /*
- * If a GPIO interrupt has an ACPI event handler method, or _EVT is
- * present, set up an interrupt handler that calls the ACPI event
- * handler.
- */
- for (res = buf.pointer;
- res && (res->type != ACPI_RESOURCE_TYPE_END_TAG);
- res = ACPI_NEXT_RESOURCE(res)) {
- irq_handler_t handler = NULL;
- void *data;
-
- if (res->type != ACPI_RESOURCE_TYPE_GPIO ||
- res->data.gpio.connection_type !=
- ACPI_RESOURCE_GPIO_TYPE_INT)
- continue;
+ ret = gpiochip_request_own_desc(desc, "ACPI:Event");
+ if (ret) {
+ dev_err(chip->dev, "Failed to request GPIO\n");
+ return AE_ERROR;
+ }
- pin = res->data.gpio.pin_table[0];
- if (pin > chip->ngpio)
- continue;
+ gpiod_direction_input(desc);
- irq = chip->to_irq(chip, pin);
- if (irq < 0)
- continue;
+ ret = gpiod_lock_as_irq(desc);
+ if (ret) {
+ dev_err(chip->dev, "Failed to lock GPIO as interrupt\n");
+ goto fail_free_desc;
+ }
- if (pin <= 255) {
- acpi_handle ev_handle;
+ irq = gpiod_to_irq(desc);
+ if (irq < 0) {
+ dev_err(chip->dev, "Failed to translate GPIO to IRQ\n");
+ goto fail_unlock_irq;
+ }
- sprintf(ev_name, "_%c%02X",
- res->data.gpio.triggering ? 'E' : 'L', pin);
- status = acpi_get_handle(handle, ev_name, &ev_handle);
- if (ACPI_SUCCESS(status)) {
- handler = acpi_gpio_irq_handler;
- data = ev_handle;
- }
+ irqflags = IRQF_ONESHOT;
+ if (agpio->triggering == ACPI_LEVEL_SENSITIVE) {
+ if (agpio->polarity == ACPI_ACTIVE_HIGH)
+ irqflags |= IRQF_TRIGGER_HIGH;
+ else
+ irqflags |= IRQF_TRIGGER_LOW;
+ } else {
+ switch (agpio->polarity) {
+ case ACPI_ACTIVE_HIGH:
+ irqflags |= IRQF_TRIGGER_RISING;
+ break;
+ case ACPI_ACTIVE_LOW:
+ irqflags |= IRQF_TRIGGER_FALLING;
+ break;
+ default:
+ irqflags |= IRQF_TRIGGER_RISING |
+ IRQF_TRIGGER_FALLING;
+ break;
}
- if (!handler) {
- struct acpi_gpio_event *event;
-
- status = acpi_get_handle(handle, "_EVT", &evt_handle);
- if (ACPI_FAILURE(status))
- continue
+ }
- event = kzalloc(sizeof(*event), GFP_KERNEL);
- if (!event)
- continue;
+ event = kzalloc(sizeof(*event), GFP_KERNEL);
+ if (!event)
+ goto fail_unlock_irq;
- list_add_tail(&event->node, &acpi_gpio->events);
- event->handle = evt_handle;
- event->pin = pin;
- event->irq = irq;
- handler = acpi_gpio_irq_handler_evt;
- data = event;
- }
- if (!handler)
- continue;
+ event->handle = evt_handle;
+ event->irq = irq;
+ event->pin = pin;
- /* Assume BIOS sets the triggering, so no flags */
- ret = devm_request_threaded_irq(chip->dev, irq, NULL, handler,
- 0, "GPIO-signaled-ACPI-event",
- data);
- if (ret)
- dev_err(chip->dev,
- "Failed to request IRQ %d ACPI event handler\n",
- irq);
+ ret = request_threaded_irq(event->irq, NULL, handler, irqflags,
+ "ACPI:Event", event);
+ if (ret) {
+ dev_err(chip->dev, "Failed to setup interrupt handler for %d\n",
+ event->irq);
+ goto fail_free_event;
}
+
+ list_add_tail(&event->node, &acpi_gpio->events);
+ return AE_OK;
+
+fail_free_event:
+ kfree(event);
+fail_unlock_irq:
+ gpiod_unlock_as_irq(desc);
+fail_free_desc:
+ gpiochip_free_own_desc(desc);
+
+ return AE_ERROR;
}
/**
- * acpi_gpiochip_free_interrupts() - Free GPIO _EVT ACPI event interrupts.
+ * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
* @acpi_gpio: ACPI GPIO chip
*
- * Free interrupts associated with the _EVT method for the given 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
+ * chip's interrupt handler. acpi_gpiochip_request_interrupts finds out which
+ * 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 acpi_gpio_chip *acpi_gpio)
+{
+ struct gpio_chip *chip = acpi_gpio->chip;
+
+ if (!chip->dev || !chip->to_irq)
+ return;
+
+ INIT_LIST_HEAD(&acpi_gpio->events);
+ acpi_walk_resources(ACPI_HANDLE(chip->dev), "_AEI",
+ acpi_gpiochip_request_interrupt, acpi_gpio);
+}
+
+/**
+ * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts.
+ * @acpi_gpio: ACPI GPIO chip
*
- * The remaining ACPI event interrupts associated with the chip are freed
- * automatically.
+ * Free interrupts associated with GPIO ACPI event method for the given
+ * GPIO chip.
*/
static void acpi_gpiochip_free_interrupts(struct acpi_gpio_chip *acpi_gpio)
{
@@ -206,7 +243,14 @@ static void acpi_gpiochip_free_interrupts(struct acpi_gpio_chip *acpi_gpio)
return;
list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
- devm_free_irq(chip->dev, event->irq, event);
+ struct gpio_desc *desc;
+
+ free_irq(event->irq, event);
+ desc = gpiochip_get_desc(chip, event->pin);
+ if (WARN_ON(IS_ERR(desc)))
+ continue;
+ gpiod_unlock_as_irq(desc);
+ gpiochip_free_own_desc(desc);
list_del(&event->node);
kfree(event);
}
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 8fbc67a88465..3707930e082e 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1266,11 +1266,12 @@ int gpiochip_remove(struct gpio_chip *chip)
int status = 0;
unsigned id;
+ acpi_gpiochip_remove(chip);
+
spin_lock_irqsave(&gpio_lock, flags);
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)) {
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