static void acpi_virtual_gpio_request_interrupts(struct virtual_gpio_data *gd)
{
struct device *dev = &gd->pdev->dev;
struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL};
struct acpi_resource *res;
acpi_handle handle, ev_handle;
acpi_status status;
unsigned int pin;
int ret;
char ev_name[5];
handle = ACPI_HANDLE(dev);
if (!handle)
return;
status = acpi_get_event_resources(handle, &buf);
if (ACPI_FAILURE(status))
return;
/*
* If a GPIO interrupt has an ACPI event handler method, 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)) {
if (res->type != ACPI_RESOURCE_TYPE_GPIO ||
res->data.gpio.connection_type !=
ACPI_RESOURCE_GPIO_TYPE_INT)
continue;
pin = res->data.gpio.pin_table[0];
dev_info(dev, "virtual gpio pin = %d\n", pin);
if (pin > 255)
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;
/* Assume BIOS sets the triggering, so no flags */
ret = devm_request_irq(dev, gd->irq,
virtual_gpio_irq_handler_isr,
0,
VIRTUAL_GPIO_DRIVER_NAME,
ev_handle);
if (ret)
dev_err(dev,
"Failed to request IRQ %d ACPI event handler\n",
gd->irq);
}
}
static acpi_status
acpi_db_device_resources(acpi_handle obj_handle,
u32 nesting_level, void *context, void **return_value)
{
struct acpi_namespace_node *node;
struct acpi_namespace_node *prt_node = NULL;
struct acpi_namespace_node *crs_node = NULL;
struct acpi_namespace_node *prs_node = NULL;
struct acpi_namespace_node *aei_node = NULL;
char *parent_path;
struct acpi_buffer return_buffer;
acpi_status status;
node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
parent_path = acpi_ns_get_normalized_pathname(node, TRUE);
if (!parent_path) {
return (AE_NO_MEMORY);
}
/* Get handles to the resource methods for this device */
(void)acpi_get_handle(node, METHOD_NAME__PRT,
ACPI_CAST_PTR(acpi_handle, &prt_node));
(void)acpi_get_handle(node, METHOD_NAME__CRS,
ACPI_CAST_PTR(acpi_handle, &crs_node));
(void)acpi_get_handle(node, METHOD_NAME__PRS,
ACPI_CAST_PTR(acpi_handle, &prs_node));
(void)acpi_get_handle(node, METHOD_NAME__AEI,
ACPI_CAST_PTR(acpi_handle, &aei_node));
if (!prt_node && !crs_node && !prs_node && !aei_node) {
goto cleanup; /* Nothing to do */
}
acpi_os_printf("\nDevice: %s\n", parent_path);
/* Prepare for a return object of arbitrary size */
return_buffer.pointer = acpi_gbl_db_buffer;
return_buffer.length = ACPI_DEBUG_BUFFER_SIZE;
/* _PRT */
if (prt_node) {
acpi_os_printf("Evaluating _PRT\n");
status =
acpi_evaluate_object(prt_node, NULL, NULL, &return_buffer);
if (ACPI_FAILURE(status)) {
acpi_os_printf("Could not evaluate _PRT: %s\n",
acpi_format_exception(status));
goto get_crs;
}
return_buffer.pointer = acpi_gbl_db_buffer;
return_buffer.length = ACPI_DEBUG_BUFFER_SIZE;
status = acpi_get_irq_routing_table(node, &return_buffer);
if (ACPI_FAILURE(status)) {
acpi_os_printf("GetIrqRoutingTable failed: %s\n",
acpi_format_exception(status));
goto get_crs;
}
acpi_rs_dump_irq_list(ACPI_CAST_PTR(u8, acpi_gbl_db_buffer));
}
/* _CRS */
get_crs:
if (crs_node) {
acpi_os_printf("Evaluating _CRS\n");
return_buffer.pointer = acpi_gbl_db_buffer;
return_buffer.length = ACPI_DEBUG_BUFFER_SIZE;
status =
acpi_evaluate_object(crs_node, NULL, NULL, &return_buffer);
if (ACPI_FAILURE(status)) {
acpi_os_printf("Could not evaluate _CRS: %s\n",
acpi_format_exception(status));
goto get_prs;
}
/* This code exercises the acpi_walk_resources interface */
status = acpi_walk_resources(node, METHOD_NAME__CRS,
acpi_db_resource_callback, NULL);
if (ACPI_FAILURE(status)) {
acpi_os_printf("AcpiWalkResources failed: %s\n",
acpi_format_exception(status));
goto get_prs;
}
/* Get the _CRS resource list (test ALLOCATE buffer) */
return_buffer.pointer = NULL;
return_buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
status = acpi_get_current_resources(node, &return_buffer);
if (ACPI_FAILURE(status)) {
acpi_os_printf("AcpiGetCurrentResources failed: %s\n",
acpi_format_exception(status));
goto get_prs;
}
/* This code exercises the acpi_walk_resource_buffer interface */
status = acpi_walk_resource_buffer(&return_buffer,
acpi_db_resource_callback,
NULL);
if (ACPI_FAILURE(status)) {
acpi_os_printf("AcpiWalkResourceBuffer failed: %s\n",
acpi_format_exception(status));
goto end_crs;
}
/* Dump the _CRS resource list */
acpi_rs_dump_resource_list(ACPI_CAST_PTR(struct acpi_resource,
return_buffer.
pointer));
/*
* Perform comparison of original AML to newly created AML. This
* tests both the AML->Resource conversion and the Resource->AML
* conversion.
*/
(void)acpi_dm_test_resource_conversion(node, METHOD_NAME__CRS);
/* Execute _SRS with the resource list */
acpi_os_printf("Evaluating _SRS\n");
status = acpi_set_current_resources(node, &return_buffer);
if (ACPI_FAILURE(status)) {
acpi_os_printf("AcpiSetCurrentResources failed: %s\n",
acpi_format_exception(status));
goto end_crs;
}
end_crs:
ACPI_FREE(return_buffer.pointer);
}
/* _PRS */
get_prs:
if (prs_node) {
acpi_os_printf("Evaluating _PRS\n");
return_buffer.pointer = acpi_gbl_db_buffer;
return_buffer.length = ACPI_DEBUG_BUFFER_SIZE;
status =
acpi_evaluate_object(prs_node, NULL, NULL, &return_buffer);
if (ACPI_FAILURE(status)) {
acpi_os_printf("Could not evaluate _PRS: %s\n",
acpi_format_exception(status));
goto get_aei;
}
return_buffer.pointer = acpi_gbl_db_buffer;
return_buffer.length = ACPI_DEBUG_BUFFER_SIZE;
status = acpi_get_possible_resources(node, &return_buffer);
if (ACPI_FAILURE(status)) {
acpi_os_printf("AcpiGetPossibleResources failed: %s\n",
acpi_format_exception(status));
goto get_aei;
}
acpi_rs_dump_resource_list(ACPI_CAST_PTR
(struct acpi_resource,
acpi_gbl_db_buffer));
}
/* _AEI */
get_aei:
if (aei_node) {
acpi_os_printf("Evaluating _AEI\n");
return_buffer.pointer = acpi_gbl_db_buffer;
return_buffer.length = ACPI_DEBUG_BUFFER_SIZE;
status =
acpi_evaluate_object(aei_node, NULL, NULL, &return_buffer);
if (ACPI_FAILURE(status)) {
acpi_os_printf("Could not evaluate _AEI: %s\n",
acpi_format_exception(status));
goto cleanup;
}
return_buffer.pointer = acpi_gbl_db_buffer;
return_buffer.length = ACPI_DEBUG_BUFFER_SIZE;
status = acpi_get_event_resources(node, &return_buffer);
if (ACPI_FAILURE(status)) {
acpi_os_printf("AcpiGetEventResources failed: %s\n",
acpi_format_exception(status));
goto cleanup;
}
acpi_rs_dump_resource_list(ACPI_CAST_PTR
(struct acpi_resource,
acpi_gbl_db_buffer));
}
cleanup:
ACPI_FREE(parent_path);
return (AE_OK);
}
/**
* acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
* @chip: 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.
*/
void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
{
struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL};
struct acpi_resource *res;
acpi_handle handle, evt_handle;
struct list_head *evt_pins = NULL;
acpi_status status;
unsigned int pin;
int irq, ret;
char ev_name[5];
if (!chip->dev || !chip->to_irq)
return;
handle = ACPI_HANDLE(chip->dev);
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;
}
}
}
/*
* 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;
pin = res->data.gpio.pin_table[0];
if (pin > chip->ngpio)
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, handler,
0, "GPIO-signaled-ACPI-event",
data);
if (ret)
dev_err(chip->dev,
"Failed to request IRQ %d ACPI event handler\n",
irq);
}
}
