| // 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. |
| |
| // WARNING: This file is machine generated by fidlc. |
| |
| #pragma once |
| |
| #include <ddk/protocol/gpio.h> |
| #include <ddktl/device-internal.h> |
| #include <zircon/assert.h> |
| #include <zircon/compiler.h> |
| #include <zircon/types.h> |
| |
| #include "gpio-internal.h" |
| |
| // DDK gpio-protocol support |
| // |
| // :: Proxies :: |
| // |
| // ddk::GpioProtocolProxy is a simple wrapper around |
| // gpio_protocol_t. It does not own the pointers passed to it |
| // |
| // :: Mixins :: |
| // |
| // ddk::GpioProtocol is a mixin class that simplifies writing DDK drivers |
| // that implement the gpio protocol. It doesn't set the base protocol. |
| // |
| // :: Examples :: |
| // |
| // // A driver that implements a ZX_PROTOCOL_GPIO device. |
| // class GpioDevice { |
| // using GpioDeviceType = ddk::Device<GpioDevice, /* ddk mixins */>; |
| // |
| // class GpioDevice : public GpioDeviceType, |
| // public ddk::GpioProtocol<GpioDevice> { |
| // public: |
| // GpioDevice(zx_device_t* parent) |
| // : GpioDeviceType("my-gpio-protocol-device", parent) {} |
| // |
| // zx_status_t GpioConfigIn(uint32_t index, uint32_t flags); |
| // |
| // zx_status_t GpioConfigOut(uint32_t index, uint8_t initial_value); |
| // |
| // zx_status_t GpioSetAltFunction(uint32_t index, uint64_t function); |
| // |
| // zx_status_t GpioRead(uint32_t index, uint8_t* out_value); |
| // |
| // zx_status_t GpioWrite(uint32_t index, uint8_t value); |
| // |
| // zx_status_t GpioGetInterrupt(uint32_t index, uint32_t flags, zx_handle_t* out_irq); |
| // |
| // zx_status_t GpioReleaseInterrupt(uint32_t index); |
| // |
| // zx_status_t GpioSetPolarity(uint32_t index, gpio_polarity_t polarity); |
| // |
| // ... |
| // }; |
| |
| namespace ddk { |
| |
| // In the functions below, the GPIO index is relative to the list of GPIOs for the device. |
| // For example, the list of GPIOs a platform device has access to would likely be a small |
| // subset of the total number of GPIOs, while a platform bus implementation driver would |
| // have access to the complete set of GPIOs. |
| template <typename D> |
| class GpioProtocol : public internal::base_mixin { |
| public: |
| GpioProtocol() { |
| internal::CheckGpioProtocolSubclass<D>(); |
| gpio_protocol_ops_.config_in = GpioConfigIn; |
| gpio_protocol_ops_.config_out = GpioConfigOut; |
| gpio_protocol_ops_.set_alt_function = GpioSetAltFunction; |
| gpio_protocol_ops_.read = GpioRead; |
| gpio_protocol_ops_.write = GpioWrite; |
| gpio_protocol_ops_.get_interrupt = GpioGetInterrupt; |
| gpio_protocol_ops_.release_interrupt = GpioReleaseInterrupt; |
| gpio_protocol_ops_.set_polarity = GpioSetPolarity; |
| } |
| |
| protected: |
| gpio_protocol_ops_t gpio_protocol_ops_ = {}; |
| |
| private: |
| // Configures a GPIO for input. |
| static zx_status_t GpioConfigIn(void* ctx, uint32_t index, uint32_t flags) { |
| return static_cast<D*>(ctx)->GpioConfigIn(index, flags); |
| } |
| // Configures a GPIO for output. |
| static zx_status_t GpioConfigOut(void* ctx, uint32_t index, uint8_t initial_value) { |
| return static_cast<D*>(ctx)->GpioConfigOut(index, initial_value); |
| } |
| // Configures the GPIO pin for an alternate function (I2C, SPI, etc) |
| // the interpretation of "function" is platform dependent. |
| static zx_status_t GpioSetAltFunction(void* ctx, uint32_t index, uint64_t function) { |
| return static_cast<D*>(ctx)->GpioSetAltFunction(index, function); |
| } |
| // Reads the current value of a GPIO (0 or 1). |
| static zx_status_t GpioRead(void* ctx, uint32_t index, uint8_t* out_value) { |
| return static_cast<D*>(ctx)->GpioRead(index, out_value); |
| } |
| // Sets the current value of the GPIO (any non-zero value maps to 1). |
| static zx_status_t GpioWrite(void* ctx, uint32_t index, uint8_t value) { |
| return static_cast<D*>(ctx)->GpioWrite(index, value); |
| } |
| // Gets an interrupt object pertaining to a particular GPIO pin. |
| static zx_status_t GpioGetInterrupt(void* ctx, uint32_t index, uint32_t flags, |
| zx_handle_t* out_irq) { |
| return static_cast<D*>(ctx)->GpioGetInterrupt(index, flags, out_irq); |
| } |
| // Release the interrupt. |
| static zx_status_t GpioReleaseInterrupt(void* ctx, uint32_t index) { |
| return static_cast<D*>(ctx)->GpioReleaseInterrupt(index); |
| } |
| // Set GPIO polarity. |
| static zx_status_t GpioSetPolarity(void* ctx, uint32_t index, gpio_polarity_t polarity) { |
| return static_cast<D*>(ctx)->GpioSetPolarity(index, polarity); |
| } |
| }; |
| |
| class GpioProtocolProxy { |
| public: |
| GpioProtocolProxy() : ops_(nullptr), ctx_(nullptr) {} |
| GpioProtocolProxy(const gpio_protocol_t* proto) : ops_(proto->ops), ctx_(proto->ctx) {} |
| |
| void GetProto(gpio_protocol_t* proto) { |
| proto->ctx = ctx_; |
| proto->ops = ops_; |
| } |
| bool is_valid() { return ops_ != nullptr; } |
| void clear() { |
| ctx_ = nullptr; |
| ops_ = nullptr; |
| } |
| // Configures a GPIO for input. |
| zx_status_t ConfigIn(uint32_t index, uint32_t flags) { |
| return ops_->config_in(ctx_, index, flags); |
| } |
| // Configures a GPIO for output. |
| zx_status_t ConfigOut(uint32_t index, uint8_t initial_value) { |
| return ops_->config_out(ctx_, index, initial_value); |
| } |
| // Configures the GPIO pin for an alternate function (I2C, SPI, etc) |
| // the interpretation of "function" is platform dependent. |
| zx_status_t SetAltFunction(uint32_t index, uint64_t function) { |
| return ops_->set_alt_function(ctx_, index, function); |
| } |
| // Reads the current value of a GPIO (0 or 1). |
| zx_status_t Read(uint32_t index, uint8_t* out_value) { |
| return ops_->read(ctx_, index, out_value); |
| } |
| // Sets the current value of the GPIO (any non-zero value maps to 1). |
| zx_status_t Write(uint32_t index, uint8_t value) { return ops_->write(ctx_, index, value); } |
| // Gets an interrupt object pertaining to a particular GPIO pin. |
| zx_status_t GetInterrupt(uint32_t index, uint32_t flags, zx_handle_t* out_irq) { |
| return ops_->get_interrupt(ctx_, index, flags, out_irq); |
| } |
| // Release the interrupt. |
| zx_status_t ReleaseInterrupt(uint32_t index) { return ops_->release_interrupt(ctx_, index); } |
| // Set GPIO polarity. |
| zx_status_t SetPolarity(uint32_t index, gpio_polarity_t polarity) { |
| return ops_->set_polarity(ctx_, index, polarity); |
| } |
| |
| private: |
| gpio_protocol_ops_t* ops_; |
| void* ctx_; |
| }; |
| |
| } // namespace ddk |