326 lines
7.4 KiB
C
326 lines
7.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* pnpacpi -- PnP ACPI driver
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*
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* Copyright (c) 2004 Matthieu Castet <castet.matthieu@free.fr>
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* Copyright (c) 2004 Li Shaohua <shaohua.li@intel.com>
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*/
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#include <linux/export.h>
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#include <linux/acpi.h>
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#include <linux/pnp.h>
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#include <linux/slab.h>
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#include <linux/mod_devicetable.h>
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#include "../base.h"
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#include "pnpacpi.h"
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static int num;
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/*
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* Compatible Device IDs
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*/
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#define TEST_HEX(c) \
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if (!(('0' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \
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return 0
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#define TEST_ALPHA(c) \
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if (!('A' <= (c) && (c) <= 'Z')) \
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return 0
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static int __init ispnpidacpi(const char *id)
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{
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TEST_ALPHA(id[0]);
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TEST_ALPHA(id[1]);
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TEST_ALPHA(id[2]);
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TEST_HEX(id[3]);
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TEST_HEX(id[4]);
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TEST_HEX(id[5]);
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TEST_HEX(id[6]);
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if (id[7] != '\0')
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return 0;
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return 1;
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}
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static int pnpacpi_get_resources(struct pnp_dev *dev)
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{
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pnp_dbg(&dev->dev, "get resources\n");
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return pnpacpi_parse_allocated_resource(dev);
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}
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static int pnpacpi_set_resources(struct pnp_dev *dev)
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{
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struct acpi_device *acpi_dev;
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acpi_handle handle;
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int ret = 0;
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pnp_dbg(&dev->dev, "set resources\n");
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acpi_dev = ACPI_COMPANION(&dev->dev);
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if (!acpi_dev) {
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dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
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return -ENODEV;
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}
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if (WARN_ON_ONCE(acpi_dev != dev->data))
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dev->data = acpi_dev;
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handle = acpi_dev->handle;
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if (acpi_has_method(handle, METHOD_NAME__SRS)) {
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struct acpi_buffer buffer;
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ret = pnpacpi_build_resource_template(dev, &buffer);
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if (ret)
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return ret;
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ret = pnpacpi_encode_resources(dev, &buffer);
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if (!ret) {
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acpi_status status;
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status = acpi_set_current_resources(handle, &buffer);
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if (ACPI_FAILURE(status))
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ret = -EIO;
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}
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kfree(buffer.pointer);
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}
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if (!ret && acpi_device_power_manageable(acpi_dev))
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ret = acpi_device_set_power(acpi_dev, ACPI_STATE_D0);
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return ret;
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}
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static int pnpacpi_disable_resources(struct pnp_dev *dev)
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{
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struct acpi_device *acpi_dev;
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acpi_status status;
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dev_dbg(&dev->dev, "disable resources\n");
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acpi_dev = ACPI_COMPANION(&dev->dev);
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if (!acpi_dev) {
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dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
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return 0;
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}
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/* acpi_unregister_gsi(pnp_irq(dev, 0)); */
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if (acpi_device_power_manageable(acpi_dev))
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acpi_device_set_power(acpi_dev, ACPI_STATE_D3_COLD);
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/* continue even if acpi_device_set_power() fails */
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status = acpi_evaluate_object(acpi_dev->handle, "_DIS", NULL, NULL);
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if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
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return -ENODEV;
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return 0;
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}
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#ifdef CONFIG_ACPI_SLEEP
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static bool pnpacpi_can_wakeup(struct pnp_dev *dev)
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{
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struct acpi_device *acpi_dev = ACPI_COMPANION(&dev->dev);
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if (!acpi_dev) {
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dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
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return false;
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}
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return acpi_bus_can_wakeup(acpi_dev->handle);
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}
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static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
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{
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struct acpi_device *acpi_dev = ACPI_COMPANION(&dev->dev);
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int error = 0;
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if (!acpi_dev) {
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dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
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return 0;
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}
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if (device_can_wakeup(&dev->dev)) {
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error = acpi_pm_set_device_wakeup(&dev->dev,
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device_may_wakeup(&dev->dev));
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if (error)
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return error;
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}
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if (acpi_device_power_manageable(acpi_dev)) {
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int power_state = acpi_pm_device_sleep_state(&dev->dev, NULL,
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ACPI_STATE_D3_COLD);
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if (power_state < 0)
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power_state = (state.event == PM_EVENT_ON) ?
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ACPI_STATE_D0 : ACPI_STATE_D3_COLD;
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/*
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* acpi_device_set_power() can fail (keyboard port can't be
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* powered-down?), and in any case, our return value is ignored
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* by pnp_bus_suspend(). Hence we don't revert the wakeup
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* setting if the set_power fails.
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*/
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error = acpi_device_set_power(acpi_dev, power_state);
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}
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return error;
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}
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static int pnpacpi_resume(struct pnp_dev *dev)
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{
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struct acpi_device *acpi_dev = ACPI_COMPANION(&dev->dev);
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int error = 0;
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if (!acpi_dev) {
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dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
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return -ENODEV;
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}
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if (device_may_wakeup(&dev->dev))
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acpi_pm_set_device_wakeup(&dev->dev, false);
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if (acpi_device_power_manageable(acpi_dev))
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error = acpi_device_set_power(acpi_dev, ACPI_STATE_D0);
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return error;
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}
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#endif
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struct pnp_protocol pnpacpi_protocol = {
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.name = "Plug and Play ACPI",
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.get = pnpacpi_get_resources,
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.set = pnpacpi_set_resources,
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.disable = pnpacpi_disable_resources,
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#ifdef CONFIG_ACPI_SLEEP
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.can_wakeup = pnpacpi_can_wakeup,
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.suspend = pnpacpi_suspend,
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.resume = pnpacpi_resume,
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#endif
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};
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EXPORT_SYMBOL(pnpacpi_protocol);
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static const char *__init pnpacpi_get_id(struct acpi_device *device)
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{
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struct acpi_hardware_id *id;
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list_for_each_entry(id, &device->pnp.ids, list) {
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if (ispnpidacpi(id->id))
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return id->id;
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}
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return NULL;
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}
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static int __init pnpacpi_add_device(struct acpi_device *device)
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{
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struct pnp_dev *dev;
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const char *pnpid;
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struct acpi_hardware_id *id;
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int error;
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/* Skip devices that are already bound */
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if (device->physical_node_count)
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return 0;
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/*
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* If a PnPacpi device is not present , the device
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* driver should not be loaded.
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*/
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if (!acpi_has_method(device->handle, "_CRS"))
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return 0;
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pnpid = pnpacpi_get_id(device);
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if (!pnpid)
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return 0;
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if (!device->status.present)
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return 0;
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dev = pnp_alloc_dev(&pnpacpi_protocol, num, pnpid);
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if (!dev)
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return -ENOMEM;
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ACPI_COMPANION_SET(&dev->dev, device);
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dev->data = device;
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/* .enabled means the device can decode the resources */
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dev->active = device->status.enabled;
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if (acpi_has_method(device->handle, "_SRS"))
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dev->capabilities |= PNP_CONFIGURABLE;
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dev->capabilities |= PNP_READ;
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if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
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dev->capabilities |= PNP_WRITE;
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if (device->flags.removable)
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dev->capabilities |= PNP_REMOVABLE;
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if (acpi_has_method(device->handle, "_DIS"))
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dev->capabilities |= PNP_DISABLE;
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if (strlen(acpi_device_name(device)))
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strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
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else
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strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
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if (dev->active)
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pnpacpi_parse_allocated_resource(dev);
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if (dev->capabilities & PNP_CONFIGURABLE)
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pnpacpi_parse_resource_option_data(dev);
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list_for_each_entry(id, &device->pnp.ids, list) {
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if (!strcmp(id->id, pnpid))
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continue;
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if (!ispnpidacpi(id->id))
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continue;
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pnp_add_id(dev, id->id);
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}
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/* clear out the damaged flags */
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if (!dev->active)
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pnp_init_resources(dev);
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error = pnp_add_device(dev);
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if (error) {
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put_device(&dev->dev);
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return error;
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}
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num++;
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return 0;
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}
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static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
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u32 lvl, void *context,
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void **rv)
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{
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struct acpi_device *device = acpi_fetch_acpi_dev(handle);
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if (!device)
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return AE_CTRL_DEPTH;
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if (acpi_is_pnp_device(device))
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pnpacpi_add_device(device);
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return AE_OK;
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}
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int pnpacpi_disabled __initdata;
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static int __init pnpacpi_init(void)
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{
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if (acpi_disabled || pnpacpi_disabled) {
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printk(KERN_INFO "pnp: PnP ACPI: disabled\n");
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return 0;
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}
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printk(KERN_INFO "pnp: PnP ACPI init\n");
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pnp_register_protocol(&pnpacpi_protocol);
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acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
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printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
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pnp_platform_devices = 1;
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return 0;
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}
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fs_initcall(pnpacpi_init);
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static int __init pnpacpi_setup(char *str)
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{
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if (str == NULL)
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return 1;
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if (!strncmp(str, "off", 3))
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pnpacpi_disabled = 1;
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return 1;
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}
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__setup("pnpacpi=", pnpacpi_setup);
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