system/dev/bus/acpi/dev-tbmc.cpp - zircon - Git at Google

 // Copyright 2017 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.

 #include "dev.h"

 #include <ddk/debug.h>
 #include <ddktl/device.h>
 #include <ddktl/protocol/hidbus.h>

 #include <zircon/types.h>
 #include <zircon/syscalls.h>
 #include <zircon/device/input.h>
 #include <fbl/alloc_checker.h>
 #include <fbl/auto_lock.h>
 #include <fbl/mutex.h>
 #include <fbl/unique_ptr.h>
 #include <stdlib.h>
 #include <stdio.h>

 #include <acpica/acpi.h>

 #include "errors.h"

 class AcpiTbmcDevice;
 using DeviceType = ddk::Device<AcpiTbmcDevice>;

 // An instance of a GOOG0006 Tablet Motion Control device.  It presents a HID
 // interface with a single input, the state of the tablet mode switch.
 class AcpiTbmcDevice : public DeviceType,
                        public ddk::HidBusProtocol<AcpiTbmcDevice> {
 public:
     static zx_status_t Create(zx_device_t* parent, ACPI_HANDLE acpi_handle,
                               fbl::unique_ptr<AcpiTbmcDevice>* out);

     // hidbus protocol implementation
     zx_status_t HidBusQuery(uint32_t options, hid_info_t* info);
     zx_status_t HidBusStart(ddk::HidBusIfcProxy proxy);
     void HidBusStop();
     zx_status_t HidBusGetDescriptor(uint8_t desc_type, void** data, size_t* len);
     zx_status_t HidBusGetReport(uint8_t rpt_type, uint8_t rpt_id, void* data, size_t len,
                                 size_t* out_len);
     zx_status_t HidBusSetReport(uint8_t rpt_type, uint8_t rpt_id, void* data, size_t len);
     zx_status_t HidBusGetIdle(uint8_t rpt_id, uint8_t* duration);
     zx_status_t HidBusSetIdle(uint8_t rpt_id, uint8_t duration);
     zx_status_t HidBusGetProtocol(uint8_t* protocol);
     zx_status_t HidBusSetProtocol(uint8_t protocol);

     void DdkRelease();
     ~AcpiTbmcDevice();
 private:
     AcpiTbmcDevice(zx_device_t* parent, ACPI_HANDLE acpi_handle);
     DISALLOW_COPY_ASSIGN_AND_MOVE(AcpiTbmcDevice);

     zx_status_t CallTbmcMethod();
     static void NotifyHandler(ACPI_HANDLE handle, UINT32 value, void* ctx);

     zx_status_t QueueHidReportLocked();

     const ACPI_HANDLE acpi_handle_;

     fbl::Mutex lock_;

     // Current state of the tablet mode switch
     bool tablet_mode_ = false;

     // Interface the driver is currently bound to
     ddk::HidBusIfcProxy proxy_;

     static const uint8_t kHidDescriptor[];
     static const size_t kHidDescriptorLen;
     static constexpr size_t kHidReportLen = 1;
 };

 // We encode the tablet mode switch events as a vendor-defined System Control.
 // This is a bit hacky, but there is no tablet mode switch usage switch defined
 // that we can find.  System Control collections are meant to be consumed by the
 // operating system, not user applications.
 const uint8_t AcpiTbmcDevice::kHidDescriptor[] = {
     0x05, 0x01,        // Usage Page (Generic Desktop Ctrls)
     0x09, 0x80,        // Usage (Sys Control)
     0xA1, 0x01,        // Collection (Application)
     0x0B, 0x01, 0x00, 0x00, 0xFF,  //   Usage (0x0-FFFFFF) [Vendor Defined]
     0x15, 0x00,        //   Logical Minimum (0)
     0x25, 0x01,        //   Logical Maximum (1)
     0x75, 0x01,        //   Report Size (1)
     0x95, 0x01,        //   Report Count (1)
     0x81, 0x02,        //   Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
     0x75, 0x07,        //   Report Size (7)
     0x95, 0x01,        //   Report Count (1)
     0x81, 0x03,        //   Input (Const,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
     0xC0,              // End Collection
 };

 const size_t AcpiTbmcDevice::kHidDescriptorLen = sizeof(AcpiTbmcDevice::kHidDescriptor);

 AcpiTbmcDevice::AcpiTbmcDevice(zx_device_t* parent, ACPI_HANDLE acpi_handle)
     : DeviceType(parent), acpi_handle_(acpi_handle) {
 }

 AcpiTbmcDevice::~AcpiTbmcDevice() {
     AcpiRemoveNotifyHandler(acpi_handle_, ACPI_DEVICE_NOTIFY, NotifyHandler);
 }

 zx_status_t AcpiTbmcDevice::CallTbmcMethod() {
     ACPI_OBJECT obj = { };
     ACPI_BUFFER buffer = {
         .Length = sizeof(obj),
         .Pointer = &obj,
     };
     ACPI_STATUS acpi_status = AcpiEvaluateObjectTyped(acpi_handle_, const_cast<char*>("TBMC"),
                                                       nullptr, &buffer, ACPI_TYPE_INTEGER);
     if (acpi_status != AE_OK) {
         zxlogf(ERROR, "acpi-tbmc: TBMC failed: %d\n", acpi_status);
         return acpi_to_zx_status(acpi_status);
     }

     zxlogf(TRACE, "acpi-tbmc: TMBC returned 0x%llx\n", obj.Integer.Value);

     fbl::AutoLock guard(&lock_);

     bool old_mode = tablet_mode_;
     tablet_mode_ = obj.Integer.Value;
     if (tablet_mode_ != old_mode) {
         zx_status_t status = QueueHidReportLocked();
         if (status != ZX_OK) {
             return status;
         }
     }

     return ZX_OK;
 }

 void AcpiTbmcDevice::NotifyHandler(ACPI_HANDLE handle, UINT32 value, void* ctx) {
     auto dev = reinterpret_cast<AcpiTbmcDevice*>(ctx);

     zxlogf(TRACE, "acpi-tbmc: got event 0x%x\n", value);
     switch (value) {
     case 0x80:
         // Tablet mode has changed
         dev->CallTbmcMethod();
         break;
     }
 }

 zx_status_t AcpiTbmcDevice::QueueHidReportLocked() {
     if (proxy_.is_valid()) {
         zxlogf(TRACE, "acpi-tbmc:  queueing report\n");
         uint8_t report = tablet_mode_;
         proxy_.IoQueue(&report, sizeof(report));
     }
     return ZX_OK;
 }

 zx_status_t AcpiTbmcDevice::HidBusQuery(uint32_t options, hid_info_t* info) {
     zxlogf(TRACE, "acpi-tbmc: hid bus query\n");

     info->dev_num = 0;
     info->dev_class = HID_DEV_CLASS_OTHER;
     info->boot_device = false;
     return ZX_OK;
 }

 zx_status_t AcpiTbmcDevice::HidBusStart(ddk::HidBusIfcProxy proxy) {
     zxlogf(TRACE, "acpi-tbmc: hid bus start\n");

     fbl::AutoLock guard(&lock_);
     if (proxy_.is_valid()) {
         return ZX_ERR_ALREADY_BOUND;
     }
     proxy_ = proxy;
     return ZX_OK;
 }

 void AcpiTbmcDevice::HidBusStop() {
     zxlogf(TRACE, "acpi-tbmc: hid bus stop\n");

     fbl::AutoLock guard(&lock_);
     proxy_.clear();
 }

 zx_status_t AcpiTbmcDevice::HidBusGetDescriptor(uint8_t desc_type, void** data, size_t* len) {
     zxlogf(TRACE, "acpi-tbmc: hid bus get descriptor\n");

     if (data == nullptr || len == nullptr) {
         return ZX_ERR_INVALID_ARGS;
     }

     if (desc_type != HID_DESC_TYPE_REPORT) {
         return ZX_ERR_NOT_FOUND;
     }

     *data = malloc(kHidDescriptorLen);
     if (*data == nullptr) {
         return ZX_ERR_NO_MEMORY;
     }
     *len = kHidDescriptorLen;
     memcpy(*data, kHidDescriptor, kHidDescriptorLen);
     return ZX_OK;
 }

 zx_status_t AcpiTbmcDevice::HidBusGetReport(uint8_t rpt_type, uint8_t rpt_id, void* data,
                                             size_t len, size_t* out_len) {
     if (out_len == NULL) {
         return ZX_ERR_INVALID_ARGS;
     }

     if (rpt_type != HID_REPORT_TYPE_INPUT || rpt_id != 0) {
         return ZX_ERR_NOT_FOUND;
     }

     if (len < kHidReportLen) {
         return ZX_ERR_BUFFER_TOO_SMALL;
     }

     fbl::AutoLock guard(&lock_);
     uint8_t report = tablet_mode_;
     static_assert(sizeof(report) == kHidReportLen, "");
     memcpy(data, &report, kHidReportLen);

     *out_len = kHidReportLen;
     return ZX_OK;
 }

 zx_status_t AcpiTbmcDevice::HidBusSetReport(uint8_t rpt_type, uint8_t rpt_id, void* data,
                                             size_t len) {
     return ZX_ERR_NOT_SUPPORTED;
 }

 zx_status_t AcpiTbmcDevice::HidBusGetIdle(uint8_t rpt_id, uint8_t* duration) {
     return ZX_ERR_NOT_SUPPORTED;
 }

 zx_status_t AcpiTbmcDevice::HidBusSetIdle(uint8_t rpt_id, uint8_t duration) {
     return ZX_OK;
 }

 zx_status_t AcpiTbmcDevice::HidBusGetProtocol(uint8_t* protocol) {
     return ZX_ERR_NOT_SUPPORTED;
 }

 zx_status_t AcpiTbmcDevice::HidBusSetProtocol(uint8_t protocol) {
     return ZX_OK;
 }


 void AcpiTbmcDevice::DdkRelease() {
     zxlogf(INFO, "acpi-tbmc: release\n");
     delete this;
 }

 zx_status_t AcpiTbmcDevice::Create(zx_device_t* parent, ACPI_HANDLE acpi_handle,
                                    fbl::unique_ptr<AcpiTbmcDevice>* out) {
     fbl::AllocChecker ac;
     fbl::unique_ptr<AcpiTbmcDevice> dev(new (&ac) AcpiTbmcDevice(parent, acpi_handle));
     if (!ac.check()) {
         return ZX_ERR_NO_MEMORY;
     }

     // Initialize tracked state
     dev->CallTbmcMethod();

     // Install acpi event handler
     ACPI_STATUS acpi_status = AcpiInstallNotifyHandler(acpi_handle, ACPI_DEVICE_NOTIFY,
                                                        NotifyHandler, dev.get());
     if (acpi_status != AE_OK) {
         zxlogf(ERROR, "acpi-tbmc: could not install notify handler\n");
         return acpi_to_zx_status(acpi_status);
     }

     *out = fbl::move(dev);
     return ZX_OK;
 }

 zx_status_t tbmc_init(zx_device_t* parent, ACPI_HANDLE acpi_handle) {
     zxlogf(TRACE, "acpi-tbmc: init\n");

     fbl::unique_ptr<AcpiTbmcDevice> dev;
     zx_status_t status = AcpiTbmcDevice::Create(parent, acpi_handle, &dev);
     if (status != ZX_OK) {
         return status;
     }

     status = dev->DdkAdd("acpi-tbmc");
     if (status != ZX_OK) {
         return status;
     }

     // devmgr is now in charge of the memory for dev
     dev.release();

     zxlogf(INFO, "acpi-tbmc: initialized\n");
     return ZX_OK;
 }
	// Copyright 2017 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.

	#include "dev.h"

	#include <ddk/debug.h>
	#include <ddktl/device.h>
	#include <ddktl/protocol/hidbus.h>

	#include <zircon/types.h>
	#include <zircon/syscalls.h>
	#include <zircon/device/input.h>
	#include <fbl/alloc_checker.h>
	#include <fbl/auto_lock.h>
	#include <fbl/mutex.h>
	#include <fbl/unique_ptr.h>
	#include <stdlib.h>
	#include <stdio.h>

	#include <acpica/acpi.h>

	#include "errors.h"

	class AcpiTbmcDevice;
	using DeviceType = ddk::Device<AcpiTbmcDevice>;

	// An instance of a GOOG0006 Tablet Motion Control device. It presents a HID
	// interface with a single input, the state of the tablet mode switch.
	class AcpiTbmcDevice : public DeviceType,
	public ddk::HidBusProtocol<AcpiTbmcDevice> {
	public:
	static zx_status_t Create(zx_device_t* parent, ACPI_HANDLE acpi_handle,
	fbl::unique_ptr<AcpiTbmcDevice>* out);

	// hidbus protocol implementation
	zx_status_t HidBusQuery(uint32_t options, hid_info_t* info);
	zx_status_t HidBusStart(ddk::HidBusIfcProxy proxy);
	void HidBusStop();
	zx_status_t HidBusGetDescriptor(uint8_t desc_type, void** data, size_t* len);
	zx_status_t HidBusGetReport(uint8_t rpt_type, uint8_t rpt_id, void* data, size_t len,
	size_t* out_len);
	zx_status_t HidBusSetReport(uint8_t rpt_type, uint8_t rpt_id, void* data, size_t len);
	zx_status_t HidBusGetIdle(uint8_t rpt_id, uint8_t* duration);
	zx_status_t HidBusSetIdle(uint8_t rpt_id, uint8_t duration);
	zx_status_t HidBusGetProtocol(uint8_t* protocol);
	zx_status_t HidBusSetProtocol(uint8_t protocol);

	void DdkRelease();
	~AcpiTbmcDevice();
	private:
	AcpiTbmcDevice(zx_device_t* parent, ACPI_HANDLE acpi_handle);
	DISALLOW_COPY_ASSIGN_AND_MOVE(AcpiTbmcDevice);

	zx_status_t CallTbmcMethod();
	static void NotifyHandler(ACPI_HANDLE handle, UINT32 value, void* ctx);

	zx_status_t QueueHidReportLocked();

	const ACPI_HANDLE acpi_handle_;

	fbl::Mutex lock_;

	// Current state of the tablet mode switch
	bool tablet_mode_ = false;

	// Interface the driver is currently bound to
	ddk::HidBusIfcProxy proxy_;

	static const uint8_t kHidDescriptor[];
	static const size_t kHidDescriptorLen;
	static constexpr size_t kHidReportLen = 1;
	};

	// We encode the tablet mode switch events as a vendor-defined System Control.
	// This is a bit hacky, but there is no tablet mode switch usage switch defined
	// that we can find. System Control collections are meant to be consumed by the
	// operating system, not user applications.
	const uint8_t AcpiTbmcDevice::kHidDescriptor[] = {
	0x05, 0x01, // Usage Page (Generic Desktop Ctrls)
	0x09, 0x80, // Usage (Sys Control)
	0xA1, 0x01, // Collection (Application)
	0x0B, 0x01, 0x00, 0x00, 0xFF, // Usage (0x0-FFFFFF) [Vendor Defined]
	0x15, 0x00, // Logical Minimum (0)
	0x25, 0x01, // Logical Maximum (1)
	0x75, 0x01, // Report Size (1)
	0x95, 0x01, // Report Count (1)
	0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
	0x75, 0x07, // Report Size (7)
	0x95, 0x01, // Report Count (1)
	0x81, 0x03, // Input (Const,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
	0xC0, // End Collection
	};

	const size_t AcpiTbmcDevice::kHidDescriptorLen = sizeof(AcpiTbmcDevice::kHidDescriptor);

	AcpiTbmcDevice::AcpiTbmcDevice(zx_device_t* parent, ACPI_HANDLE acpi_handle)
	: DeviceType(parent), acpi_handle_(acpi_handle) {
	}

	AcpiTbmcDevice::~AcpiTbmcDevice() {
	AcpiRemoveNotifyHandler(acpi_handle_, ACPI_DEVICE_NOTIFY, NotifyHandler);
	}

	zx_status_t AcpiTbmcDevice::CallTbmcMethod() {
	ACPI_OBJECT obj = { };
	ACPI_BUFFER buffer = {
	.Length = sizeof(obj),
	.Pointer = &obj,
	};
	ACPI_STATUS acpi_status = AcpiEvaluateObjectTyped(acpi_handle_, const_cast<char*>("TBMC"),
	nullptr, &buffer, ACPI_TYPE_INTEGER);
	if (acpi_status != AE_OK) {
	zxlogf(ERROR, "acpi-tbmc: TBMC failed: %d\n", acpi_status);
	return acpi_to_zx_status(acpi_status);
	}

	zxlogf(TRACE, "acpi-tbmc: TMBC returned 0x%llx\n", obj.Integer.Value);

	fbl::AutoLock guard(&lock_);

	bool old_mode = tablet_mode_;
	tablet_mode_ = obj.Integer.Value;
	if (tablet_mode_ != old_mode) {
	zx_status_t status = QueueHidReportLocked();
	if (status != ZX_OK) {
	return status;
	}
	}

	return ZX_OK;
	}

	void AcpiTbmcDevice::NotifyHandler(ACPI_HANDLE handle, UINT32 value, void* ctx) {
	auto dev = reinterpret_cast<AcpiTbmcDevice*>(ctx);

	zxlogf(TRACE, "acpi-tbmc: got event 0x%x\n", value);
	switch (value) {
	case 0x80:
	// Tablet mode has changed
	dev->CallTbmcMethod();
	break;
	}
	}

	zx_status_t AcpiTbmcDevice::QueueHidReportLocked() {
	if (proxy_.is_valid()) {
	zxlogf(TRACE, "acpi-tbmc: queueing report\n");
	uint8_t report = tablet_mode_;
	proxy_.IoQueue(&report, sizeof(report));
	}
	return ZX_OK;
	}

	zx_status_t AcpiTbmcDevice::HidBusQuery(uint32_t options, hid_info_t* info) {
	zxlogf(TRACE, "acpi-tbmc: hid bus query\n");

	info->dev_num = 0;
	info->dev_class = HID_DEV_CLASS_OTHER;
	info->boot_device = false;
	return ZX_OK;
	}

	zx_status_t AcpiTbmcDevice::HidBusStart(ddk::HidBusIfcProxy proxy) {
	zxlogf(TRACE, "acpi-tbmc: hid bus start\n");

	fbl::AutoLock guard(&lock_);
	if (proxy_.is_valid()) {
	return ZX_ERR_ALREADY_BOUND;
	}
	proxy_ = proxy;
	return ZX_OK;
	}

	void AcpiTbmcDevice::HidBusStop() {
	zxlogf(TRACE, "acpi-tbmc: hid bus stop\n");

	fbl::AutoLock guard(&lock_);
	proxy_.clear();
	}

	zx_status_t AcpiTbmcDevice::HidBusGetDescriptor(uint8_t desc_type, void** data, size_t* len) {
	zxlogf(TRACE, "acpi-tbmc: hid bus get descriptor\n");

	if (data == nullptr \|\| len == nullptr) {
	return ZX_ERR_INVALID_ARGS;
	}

	if (desc_type != HID_DESC_TYPE_REPORT) {
	return ZX_ERR_NOT_FOUND;
	}

	*data = malloc(kHidDescriptorLen);
	if (*data == nullptr) {
	return ZX_ERR_NO_MEMORY;
	}
	*len = kHidDescriptorLen;
	memcpy(*data, kHidDescriptor, kHidDescriptorLen);
	return ZX_OK;
	}

	zx_status_t AcpiTbmcDevice::HidBusGetReport(uint8_t rpt_type, uint8_t rpt_id, void* data,
	size_t len, size_t* out_len) {
	if (out_len == NULL) {
	return ZX_ERR_INVALID_ARGS;
	}

	if (rpt_type != HID_REPORT_TYPE_INPUT \|\| rpt_id != 0) {
	return ZX_ERR_NOT_FOUND;
	}

	if (len < kHidReportLen) {
	return ZX_ERR_BUFFER_TOO_SMALL;
	}

	fbl::AutoLock guard(&lock_);
	uint8_t report = tablet_mode_;
	static_assert(sizeof(report) == kHidReportLen, "");
	memcpy(data, &report, kHidReportLen);

	*out_len = kHidReportLen;
	return ZX_OK;
	}

	zx_status_t AcpiTbmcDevice::HidBusSetReport(uint8_t rpt_type, uint8_t rpt_id, void* data,
	size_t len) {
	return ZX_ERR_NOT_SUPPORTED;
	}

	zx_status_t AcpiTbmcDevice::HidBusGetIdle(uint8_t rpt_id, uint8_t* duration) {
	return ZX_ERR_NOT_SUPPORTED;
	}

	zx_status_t AcpiTbmcDevice::HidBusSetIdle(uint8_t rpt_id, uint8_t duration) {
	return ZX_OK;
	}

	zx_status_t AcpiTbmcDevice::HidBusGetProtocol(uint8_t* protocol) {
	return ZX_ERR_NOT_SUPPORTED;
	}

	zx_status_t AcpiTbmcDevice::HidBusSetProtocol(uint8_t protocol) {
	return ZX_OK;
	}


	void AcpiTbmcDevice::DdkRelease() {
	zxlogf(INFO, "acpi-tbmc: release\n");
	delete this;
	}

	zx_status_t AcpiTbmcDevice::Create(zx_device_t* parent, ACPI_HANDLE acpi_handle,
	fbl::unique_ptr<AcpiTbmcDevice>* out) {
	fbl::AllocChecker ac;
	fbl::unique_ptr<AcpiTbmcDevice> dev(new (&ac) AcpiTbmcDevice(parent, acpi_handle));
	if (!ac.check()) {
	return ZX_ERR_NO_MEMORY;
	}

	// Initialize tracked state
	dev->CallTbmcMethod();

	// Install acpi event handler
	ACPI_STATUS acpi_status = AcpiInstallNotifyHandler(acpi_handle, ACPI_DEVICE_NOTIFY,
	NotifyHandler, dev.get());
	if (acpi_status != AE_OK) {
	zxlogf(ERROR, "acpi-tbmc: could not install notify handler\n");
	return acpi_to_zx_status(acpi_status);
	}

	*out = fbl::move(dev);
	return ZX_OK;
	}

	zx_status_t tbmc_init(zx_device_t* parent, ACPI_HANDLE acpi_handle) {
	zxlogf(TRACE, "acpi-tbmc: init\n");

	fbl::unique_ptr<AcpiTbmcDevice> dev;
	zx_status_t status = AcpiTbmcDevice::Create(parent, acpi_handle, &dev);
	if (status != ZX_OK) {
	return status;
	}

	status = dev->DdkAdd("acpi-tbmc");
	if (status != ZX_OK) {
	return status;
	}

	// devmgr is now in charge of the memory for dev
	dev.release();

	zxlogf(INFO, "acpi-tbmc: initialized\n");
	return ZX_OK;
	}