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- /* SPDX-License-Identifier: GPL-2.0 */
- /*
- * Generation of tables for particular device types
- *
- * Copyright 2019 Google LLC
- * Mostly taken from coreboot file of the same name
- */
- #ifndef __ACPI_DEVICE_H
- #define __ACPI_DEVICE_H
- #include <linux/bitops.h>
- struct udevice;
- /* ACPI descriptor values for common descriptors: SERIAL_BUS means I2C */
- #define ACPI_DESCRIPTOR_LARGE BIT(7)
- #define ACPI_DESCRIPTOR_INTERRUPT (ACPI_DESCRIPTOR_LARGE | 9)
- #define ACPI_DESCRIPTOR_GPIO (ACPI_DESCRIPTOR_LARGE | 12)
- #define ACPI_DESCRIPTOR_SERIAL_BUS (ACPI_DESCRIPTOR_LARGE | 14)
- /* Length of a full path to an ACPI device */
- #define ACPI_PATH_MAX 30
- /* Values that can be returned for ACPI device _STA method */
- enum acpi_dev_status {
- ACPI_DSTATUS_PRESENT = BIT(0),
- ACPI_DSTATUS_ENABLED = BIT(1),
- ACPI_DSTATUS_SHOW_IN_UI = BIT(2),
- ACPI_DSTATUS_OK = BIT(3),
- ACPI_DSTATUS_HAS_BATTERY = BIT(4),
- ACPI_DSTATUS_ALL_OFF = 0,
- ACPI_DSTATUS_HIDDEN_ON = ACPI_DSTATUS_PRESENT | ACPI_DSTATUS_ENABLED |
- ACPI_DSTATUS_OK,
- ACPI_DSTATUS_ALL_ON = ACPI_DSTATUS_HIDDEN_ON |
- ACPI_DSTATUS_SHOW_IN_UI,
- };
- /** enum acpi_irq_mode - edge/level trigger mode */
- enum acpi_irq_mode {
- ACPI_IRQ_EDGE_TRIGGERED,
- ACPI_IRQ_LEVEL_TRIGGERED,
- };
- /**
- * enum acpi_irq_polarity - polarity of interrupt
- *
- * @ACPI_IRQ_ACTIVE_LOW - for ACPI_IRQ_EDGE_TRIGGERED this means falling edge
- * @ACPI_IRQ_ACTIVE_HIGH - for ACPI_IRQ_EDGE_TRIGGERED this means rising edge
- * @ACPI_IRQ_ACTIVE_BOTH - not meaningful for ACPI_IRQ_EDGE_TRIGGERED
- */
- enum acpi_irq_polarity {
- ACPI_IRQ_ACTIVE_LOW,
- ACPI_IRQ_ACTIVE_HIGH,
- ACPI_IRQ_ACTIVE_BOTH,
- };
- /**
- * enum acpi_irq_shared - whether interrupt is shared or not
- *
- * @ACPI_IRQ_EXCLUSIVE: only this device uses the interrupt
- * @ACPI_IRQ_SHARED: other devices may use this interrupt
- */
- enum acpi_irq_shared {
- ACPI_IRQ_EXCLUSIVE,
- ACPI_IRQ_SHARED,
- };
- /** enum acpi_irq_wake - indicates whether this interrupt can wake the device */
- enum acpi_irq_wake {
- ACPI_IRQ_NO_WAKE,
- ACPI_IRQ_WAKE,
- };
- /**
- * struct acpi_irq - representation of an ACPI interrupt
- *
- * @pin: ACPI pin that is monitored for the interrupt
- * @mode: Edge/level triggering
- * @polarity: Interrupt polarity
- * @shared: Whether interrupt is shared or not
- * @wake: Whether interrupt can wake the device from sleep
- */
- struct acpi_irq {
- unsigned int pin;
- enum acpi_irq_mode mode;
- enum acpi_irq_polarity polarity;
- enum acpi_irq_shared shared;
- enum acpi_irq_wake wake;
- };
- /**
- * acpi_device_path() - Get the full path to an ACPI device
- *
- * This gets the full path in the form XXXX.YYYY.ZZZZ where XXXX is the root
- * and ZZZZ is the device. All parent devices are added to the path.
- *
- * @dev: Device to check
- * @buf: Buffer to place the path in (should be ACPI_PATH_MAX long)
- * @maxlen: Size of buffer (typically ACPI_PATH_MAX)
- * @return 0 if OK, -ve on error
- */
- int acpi_device_path(const struct udevice *dev, char *buf, int maxlen);
- /**
- * acpi_device_scope() - Get the scope of an ACPI device
- *
- * This gets the scope which is the full path of the parent device, as per
- * acpi_device_path().
- *
- * @dev: Device to check
- * @buf: Buffer to place the path in (should be ACPI_PATH_MAX long)
- * @maxlen: Size of buffer (typically ACPI_PATH_MAX)
- * @return 0 if OK, -EINVAL if the device has no parent, other -ve on other
- * error
- */
- int acpi_device_scope(const struct udevice *dev, char *scope, int maxlen);
- /**
- * acpi_device_status() - Get the status of a device
- *
- * This currently just returns ACPI_DSTATUS_ALL_ON. It does not support
- * inactive or hidden devices.
- *
- * @dev: Device to check
- * @return device status, as ACPI_DSTATUS_...
- */
- enum acpi_dev_status acpi_device_status(const struct udevice *dev);
- #endif
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