#include <linux/acpi.h>
#include <linux/interrupt.h>
+struct acpi_gpio_evt_pin {
+ struct list_head node;
+ acpi_handle *evt_handle;
+ unsigned int pin;
+ unsigned int irq;
+};
+
static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
{
if (!gc->dev)
}
EXPORT_SYMBOL_GPL(acpi_get_gpio);
-
static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
{
acpi_handle handle = data;
return IRQ_HANDLED;
}
+static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data)
+{
+ struct acpi_gpio_evt_pin *evt_pin = data;
+ struct acpi_object_list args;
+ union acpi_object arg;
+
+ arg.type = ACPI_TYPE_INTEGER;
+ arg.integer.value = evt_pin->pin;
+ args.count = 1;
+ args.pointer = &arg;
+
+ acpi_evaluate_object(evt_pin->evt_handle, NULL, &args, NULL);
+
+ return IRQ_HANDLED;
+}
+
+static void acpi_gpio_evt_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
* 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.
- *
- * Interrupts are automatically freed on driver detach
*/
-
void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
{
struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL};
struct acpi_resource *res;
- acpi_handle handle, ev_handle;
+ acpi_handle handle, evt_handle;
+ struct list_head *evt_pins = NULL;
acpi_status status;
unsigned int pin;
int irq, ret;
if (ACPI_FAILURE(status))
return;
- /* If a gpio interrupt has an acpi event handler method, then
- * set up an interrupt handler that calls the acpi event handler
- */
+ 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;
+ }
+ }
+ }
+ /*
+ * 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 !=
if (pin > chip->ngpio)
continue;
- sprintf(ev_name, "_%c%02X",
- res->data.gpio.triggering ? 'E' : 'L', pin);
-
- status = acpi_get_handle(handle, ev_name, &ev_handle);
- if (ACPI_FAILURE(status))
- continue;
-
irq = chip->to_irq(chip, pin);
if (irq < 0)
continue;
+ if (pin <= 255) {
+ acpi_handle ev_handle;
+
+ 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;
+ }
+ }
+ if (!handler && evt_pins) {
+ struct acpi_gpio_evt_pin *evt_pin;
+
+ evt_pin = kzalloc(sizeof(*evt_pin), GFP_KERNEL);
+ if (!evt_pin)
+ continue;
+
+ list_add_tail(&evt_pin->node, evt_pins);
+ evt_pin->evt_handle = evt_handle;
+ evt_pin->pin = pin;
+ evt_pin->irq = irq;
+ handler = acpi_gpio_irq_handler_evt;
+ data = evt_pin;
+ }
+ if (!handler)
+ continue;
+
/* Assume BIOS sets the triggering, so no flags */
- ret = devm_request_threaded_irq(chip->dev, irq, NULL,
- acpi_gpio_irq_handler,
- 0,
- "GPIO-signaled-ACPI-event",
- ev_handle);
+ 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",
}
}
EXPORT_SYMBOL(acpi_gpiochip_request_interrupts);
+
+struct acpi_gpio_lookup {
+ struct acpi_gpio_info info;
+ int index;
+ int gpio;
+ int n;
+};
+
+static int acpi_find_gpio(struct acpi_resource *ares, void *data)
+{
+ struct acpi_gpio_lookup *lookup = data;
+
+ if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
+ return 1;
+
+ if (lookup->n++ == lookup->index && lookup->gpio < 0) {
+ const struct acpi_resource_gpio *agpio = &ares->data.gpio;
+
+ lookup->gpio = acpi_get_gpio(agpio->resource_source.string_ptr,
+ agpio->pin_table[0]);
+ lookup->info.gpioint =
+ agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
+ }
+
+ return 1;
+}
+
+/**
+ * acpi_get_gpio_by_index() - get a GPIO number from device resources
+ * @dev: pointer to a device to get GPIO from
+ * @index: index of GpioIo/GpioInt resource (starting from %0)
+ * @info: info pointer to fill in (optional)
+ *
+ * Function goes through ACPI resources for @dev and based on @index looks
+ * up a GpioIo/GpioInt resource, translates it to the Linux GPIO number,
+ * and returns it. @index matches GpioIo/GpioInt resources only so if there
+ * are total %3 GPIO resources, the index goes from %0 to %2.
+ *
+ * If the GPIO cannot be translated or there is an error, negative errno is
+ * returned.
+ *
+ * Note: if the GPIO resource has multiple entries in the pin list, this
+ * function only returns the first.
+ */
+int acpi_get_gpio_by_index(struct device *dev, int index,
+ struct acpi_gpio_info *info)
+{
+ struct acpi_gpio_lookup lookup;
+ struct list_head resource_list;
+ struct acpi_device *adev;
+ acpi_handle handle;
+ int ret;
+
+ if (!dev)
+ return -EINVAL;
+
+ handle = ACPI_HANDLE(dev);
+ if (!handle || acpi_bus_get_device(handle, &adev))
+ return -ENODEV;
+
+ memset(&lookup, 0, sizeof(lookup));
+ lookup.index = index;
+ lookup.gpio = -ENODEV;
+
+ INIT_LIST_HEAD(&resource_list);
+ ret = acpi_dev_get_resources(adev, &resource_list, acpi_find_gpio,
+ &lookup);
+ if (ret < 0)
+ return ret;
+
+ acpi_dev_free_resource_list(&resource_list);
+
+ if (lookup.gpio >= 0 && info)
+ *info = lookup.info;
+
+ return lookup.gpio;
+}
+EXPORT_SYMBOL_GPL(acpi_get_gpio_by_index);
+
+/**
+ * acpi_gpiochip_free_interrupts() - Free GPIO _EVT ACPI event interrupts.
+ * @chip: 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.
+ */
+void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
+{
+ acpi_handle handle;
+ acpi_status status;
+ struct list_head *evt_pins;
+ struct acpi_gpio_evt_pin *evt_pin, *ep;
+
+ 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) {
+ 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);
+}
+EXPORT_SYMBOL(acpi_gpiochip_free_interrupts);
projects / firefly-linux-kernel-4.4.55.git / blobdiff