| // 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 <ddk/binding.h> |
| #include <ddk/debug.h> |
| #include <ddk/device.h> |
| #include <ddk/driver.h> |
| |
| #include <acpica/acpi.h> |
| #include <fuchsia/hardware/power/c/fidl.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <threads.h> |
| #include <zircon/syscalls.h> |
| #include <zircon/types.h> |
| |
| #include "dev.h" |
| #include "errors.h" |
| #include "power.h" |
| |
| typedef struct acpi_pwrsrc_device { |
| zx_device_t* zxdev; |
| |
| ACPI_HANDLE acpi_handle; |
| |
| // event to notify on |
| zx_handle_t event; |
| |
| power_info_t info; |
| |
| mtx_t lock; |
| } acpi_pwrsrc_device_t; |
| |
| static zx_status_t call_PSR(acpi_pwrsrc_device_t* dev, bool notify) { |
| ACPI_OBJECT obj = { |
| .Type = ACPI_TYPE_INTEGER, |
| }; |
| ACPI_BUFFER buffer = { |
| .Length = sizeof(obj), |
| .Pointer = &obj, |
| }; |
| ACPI_STATUS acpi_status = AcpiEvaluateObject(dev->acpi_handle, (char*)"_PSR", NULL, &buffer); |
| if (acpi_status == AE_OK) { |
| mtx_lock(&dev->lock); |
| uint32_t state = dev->info.state; |
| if (obj.Integer.Value) { |
| dev->info.state |= POWER_STATE_ONLINE; |
| } else { |
| dev->info.state &= ~POWER_STATE_ONLINE; |
| } |
| zxlogf(DEBUG1, "acpi-pwrsrc: 0x%x -> 0x%x\n", state, dev->info.state); |
| if (notify && (state != dev->info.state)) { |
| zx_object_signal(dev->event, 0, ZX_USER_SIGNAL_0); |
| } |
| mtx_unlock(&dev->lock); |
| } |
| return acpi_to_zx_status(acpi_status); |
| } |
| |
| static void acpi_pwrsrc_notify(ACPI_HANDLE handle, UINT32 value, void* ctx) { |
| acpi_pwrsrc_device_t* dev = ctx; |
| zxlogf(TRACE, "acpi-pwrsrc: got event 0x%x\n", value); |
| call_PSR(dev, true); |
| } |
| |
| static void acpi_pwrsrc_release(void* ctx) { |
| acpi_pwrsrc_device_t* dev = ctx; |
| AcpiRemoveNotifyHandler(dev->acpi_handle, ACPI_DEVICE_NOTIFY, acpi_pwrsrc_notify); |
| if (dev->event != ZX_HANDLE_INVALID) { |
| zx_handle_close(dev->event); |
| } |
| free(dev); |
| } |
| |
| zx_status_t fidl_pwrsrc_get_power_info(void* ctx, fidl_txn_t* txn) { |
| acpi_pwrsrc_device_t* dev = ctx; |
| struct fuchsia_hardware_power_SourceInfo info; |
| |
| mtx_lock(&dev->lock); |
| info.state = dev->info.state; |
| info.type = dev->info.type; |
| mtx_unlock(&dev->lock); |
| |
| // reading state clears the signal |
| zx_object_signal(dev->event, ZX_USER_SIGNAL_0, 0); |
| return fuchsia_hardware_power_SourceGetPowerInfo_reply(txn, ZX_OK, &info); |
| } |
| |
| zx_status_t fidl_pwrsrc_get_state_change_event(void* ctx, fidl_txn_t* txn) { |
| acpi_pwrsrc_device_t* dev = ctx; |
| zx_handle_t out_handle; |
| zx_rights_t rights = ZX_RIGHT_WAIT | ZX_RIGHT_TRANSFER; |
| zx_status_t status = zx_handle_duplicate(dev->event, rights, &out_handle); |
| |
| if (status == ZX_OK) { |
| // clear the signal before returning |
| zx_object_signal(dev->event, ZX_USER_SIGNAL_0, 0); |
| } |
| return fuchsia_hardware_power_SourceGetStateChangeEvent_reply(txn, status, out_handle); |
| } |
| |
| static fuchsia_hardware_power_Source_ops_t fidl_ops = { |
| .GetPowerInfo = fidl_pwrsrc_get_power_info, |
| .GetStateChangeEvent = fidl_pwrsrc_get_state_change_event, |
| }; |
| |
| static zx_status_t fuchsia_hardware_power_message_instance(void* ctx, fidl_msg_t* msg, |
| fidl_txn_t* txn) { |
| return fuchsia_hardware_power_Source_dispatch(ctx, txn, msg, &fidl_ops); |
| } |
| |
| static zx_protocol_device_t acpi_pwrsrc_device_proto = { |
| .version = DEVICE_OPS_VERSION, |
| .message = fuchsia_hardware_power_message_instance, |
| .release = acpi_pwrsrc_release, |
| }; |
| |
| zx_status_t pwrsrc_init(zx_device_t* parent, ACPI_HANDLE acpi_handle) { |
| acpi_pwrsrc_device_t* dev = calloc(1, sizeof(acpi_pwrsrc_device_t)); |
| if (!dev) { |
| return ZX_ERR_NO_MEMORY; |
| } |
| |
| dev->acpi_handle = acpi_handle; |
| mtx_init(&dev->lock, mtx_plain); |
| |
| zx_status_t status = zx_event_create(0, &dev->event); |
| if (status != ZX_OK) { |
| free(dev); |
| return status; |
| } |
| |
| dev->info.type = POWER_TYPE_AC; |
| call_PSR(dev, false); |
| |
| ACPI_STATUS acpi_status = AcpiInstallNotifyHandler(acpi_handle, ACPI_DEVICE_NOTIFY, |
| acpi_pwrsrc_notify, dev); |
| if (acpi_status != AE_OK) { |
| zxlogf(ERROR, "acpi-pwrsrc: could not install notify handler\n"); |
| acpi_pwrsrc_release(dev); |
| return acpi_to_zx_status(acpi_status); |
| } |
| |
| // read initial value |
| acpi_pwrsrc_notify(acpi_handle, 0, dev); |
| |
| device_add_args_t args = { |
| .version = DEVICE_ADD_ARGS_VERSION, |
| .name = "acpi-pwrsrc", |
| .ctx = dev, |
| .ops = &acpi_pwrsrc_device_proto, |
| .proto_id = ZX_PROTOCOL_POWER, |
| }; |
| |
| status = device_add(parent, &args, &dev->zxdev); |
| if (status != ZX_OK) { |
| zxlogf(ERROR, "acpi-pwrsrc: could not add device! err=%d\n", status); |
| acpi_pwrsrc_release(dev); |
| return status; |
| } |
| |
| zxlogf(TRACE, "acpi-pwrsrc: initialized\n"); |
| |
| return ZX_OK; |
| } |