diff options
| -rw-r--r-- | drivers/gpio/gpiolib-acpi.c | 106 |
1 files changed, 64 insertions, 42 deletions
diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c index b7db098ba06..5c0cf1d76c8 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); } |