| // Copyright 2018 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| library fuchsia.hardware.gpio; |
| |
| using zx; |
| |
| /// Flags for `ConfigIn`. |
| const GPIO_PULL_DOWN uint32 = 0x0; |
| const GPIO_PULL_UP uint32 = 0x1; |
| const GPIO_NO_PULL uint32 = 0x2; |
| const GPIO_PULL_MASK uint32 = 0x3; |
| |
| /// Values for `SetPolarity`. |
| type GpioPolarity = strict enum : uint32 { |
| LOW = 0x0; |
| HIGH = 0x1; |
| }; |
| |
| @transport("Banjo") |
| @banjo_layout("ddk-protocol") |
| protocol Gpio { |
| /// Configures a GPIO for input. |
| ConfigIn(struct { |
| flags uint32; |
| }) -> (struct { |
| s zx.status; |
| }); |
| /// Configures a GPIO for output. |
| ConfigOut(struct { |
| initial_value uint8; |
| }) -> (struct { |
| s zx.status; |
| }); |
| /// Configures the GPIO pin for an alternate function (I2C, SPI, etc) |
| /// the interpretation of "function" is platform dependent. |
| SetAltFunction(struct { |
| function uint64; |
| }) -> (struct { |
| s zx.status; |
| }); |
| /// Reads the current value of a GPIO (0 or 1). |
| Read() -> (struct { |
| s zx.status; |
| value uint8; |
| }); |
| /// Sets the current value of the GPIO (any non-zero value maps to 1). |
| Write(struct { |
| value uint8; |
| }) -> (struct { |
| s zx.status; |
| }); |
| /// Gets an interrupt object pertaining to a particular GPIO pin. |
| GetInterrupt(struct { |
| flags uint32; |
| }) -> (resource struct { |
| s zx.status; |
| irq zx.handle:INTERRUPT; |
| }); |
| /// Release the interrupt. |
| ReleaseInterrupt() -> (struct { |
| s zx.status; |
| }); |
| /// Set GPIO polarity. |
| SetPolarity(struct { |
| polarity GpioPolarity; |
| }) -> (struct { |
| s zx.status; |
| }); |
| /// Set GPIO drive strength. |
| SetDriveStrength(struct { |
| ds_ua uint64; |
| }) -> (struct { |
| s zx.status; |
| actual_ds_ua uint64; |
| }); |
| /// Get GPIO drive strength. |
| GetDriveStrength() -> (struct { |
| s zx.status; |
| value uint64; |
| }); |
| }; |