Quelle  core.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * pnpacpi -- PnP ACPI driver
 *
 * Copyright (c) 2004 Matthieu Castet <castet.matthieu@free.fr>
 * Copyright (c) 2004 Li Shaohua <shaohua.li@intel.com>
 */

#include <linux/export.h>
#include <linux/acpi.h>
#include <linux/pnp.h>
#include <linux/slab.h>
#include <linux/mod_devicetable.h>

#include "../base.h"
#include "pnpacpi.h"

static int num;

/*
 * Compatible Device IDs
 */
#define TEST_HEX(c) \
 if (!(('0' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \
  return 0
#define TEST_ALPHA(c) \
 if (!('A' <= (c) && (c) <= 'Z')) \
  return 0
static int __init ispnpidacpi(const char *id)
{
 TEST_ALPHA(id[0]);
 TEST_ALPHA(id[1]);
 TEST_ALPHA(id[2]);
 TEST_HEX(id[3]);
 TEST_HEX(id[4]);
 TEST_HEX(id[5]);
 TEST_HEX(id[6]);
 if (id[7] != '\0')
  return 0;
 return 1;
}

static int pnpacpi_get_resources(struct pnp_dev *dev)
{
 pnp_dbg(&dev->dev, "get resources\n");
 return pnpacpi_parse_allocated_resource(dev);
}

static int pnpacpi_set_resources(struct pnp_dev *dev)
{
 struct acpi_device *acpi_dev;
 acpi_handle handle;
 int ret = 0;

 pnp_dbg(&dev->dev, "set resources\n");

 acpi_dev = ACPI_COMPANION(&dev->dev);
 if (!acpi_dev) {
  dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
  return -ENODEV;
 }

 if (WARN_ON_ONCE(acpi_dev != dev->data))
  dev->data = acpi_dev;

 handle = acpi_dev->handle;
 if (acpi_has_method(handle, METHOD_NAME__SRS)) {
  struct acpi_buffer buffer;

  ret = pnpacpi_build_resource_template(dev, &buffer);
  if (ret)
   return ret;

  ret = pnpacpi_encode_resources(dev, &buffer);
  if (!ret) {
   acpi_status status;

   status = acpi_set_current_resources(handle, &buffer);
   if (ACPI_FAILURE(status))
    ret = -EIO;
  }
  kfree(buffer.pointer);
 }
 if (!ret && acpi_device_power_manageable(acpi_dev))
  ret = acpi_device_set_power(acpi_dev, ACPI_STATE_D0);

 return ret;
}

static int pnpacpi_disable_resources(struct pnp_dev *dev)
{
 struct acpi_device *acpi_dev;
 acpi_status status;

 dev_dbg(&dev->dev, "disable resources\n");

 acpi_dev = ACPI_COMPANION(&dev->dev);
 if (!acpi_dev) {
  dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
  return 0;
 }

 /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 if (acpi_device_power_manageable(acpi_dev))
  acpi_device_set_power(acpi_dev, ACPI_STATE_D3_COLD);

 /* continue even if acpi_device_set_power() fails */
 status = acpi_evaluate_object(acpi_dev->handle, "_DIS", NULL, NULL);
 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
  return -ENODEV;

 return 0;
}

#ifdef CONFIG_ACPI_SLEEP
static bool pnpacpi_can_wakeup(struct pnp_dev *dev)
{
 struct acpi_device *acpi_dev = ACPI_COMPANION(&dev->dev);

 if (!acpi_dev) {
  dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
  return false;
 }

 return acpi_bus_can_wakeup(acpi_dev->handle);
}

static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
{
 struct acpi_device *acpi_dev = ACPI_COMPANION(&dev->dev);
 int error = 0;

 if (!acpi_dev) {
  dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
  return 0;
 }

 if (device_can_wakeup(&dev->dev)) {
  error = acpi_pm_set_device_wakeup(&dev->dev,
           device_may_wakeup(&dev->dev));
  if (error)
   return error;
 }

 if (acpi_device_power_manageable(acpi_dev)) {
  int power_state = acpi_pm_device_sleep_state(&dev->dev, NULL,
       ACPI_STATE_D3_COLD);
  if (power_state < 0)
   power_state = (state.event == PM_EVENT_ON) ?
     ACPI_STATE_D0 : ACPI_STATE_D3_COLD;

  /*
 * acpi_device_set_power() can fail (keyboard port can't be
 * powered-down?), and in any case, our return value is ignored
 * by pnp_bus_suspend().  Hence we don't revert the wakeup
 * setting if the set_power fails.
 */
  error = acpi_device_set_power(acpi_dev, power_state);
 }

 return error;
}

static int pnpacpi_resume(struct pnp_dev *dev)
{
 struct acpi_device *acpi_dev = ACPI_COMPANION(&dev->dev);
 int error = 0;

 if (!acpi_dev) {
  dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
  return -ENODEV;
 }

 if (device_may_wakeup(&dev->dev))
  acpi_pm_set_device_wakeup(&dev->dev, false);

 if (acpi_device_power_manageable(acpi_dev))
  error = acpi_device_set_power(acpi_dev, ACPI_STATE_D0);

 return error;
}
#endif

struct pnp_protocol pnpacpi_protocol = {
 .name  = "Plug and Play ACPI",
 .get  = pnpacpi_get_resources,
 .set  = pnpacpi_set_resources,
 .disable = pnpacpi_disable_resources,
#ifdef CONFIG_ACPI_SLEEP
 .can_wakeup = pnpacpi_can_wakeup,
 .suspend = pnpacpi_suspend,
 .resume = pnpacpi_resume,
#endif
};
EXPORT_SYMBOL(pnpacpi_protocol);

static const char *__init pnpacpi_get_id(struct acpi_device *device)
{
 struct acpi_hardware_id *id;

 list_for_each_entry(id, &device->pnp.ids, list) {
  if (ispnpidacpi(id->id))
   return id->id;
 }

 return NULL;
}

static int __init pnpacpi_add_device(struct acpi_device *device)
{
 struct pnp_dev *dev;
 const char *pnpid;
 struct acpi_hardware_id *id;
 int error;

 /* Skip devices that are already bound */
 if (device->physical_node_count)
  return 0;

 /*
 * If a PnPacpi device is not present , the device
 * driver should not be loaded.
 */
 if (!acpi_has_method(device->handle, "_CRS"))
  return 0;

 pnpid = pnpacpi_get_id(device);
 if (!pnpid)
  return 0;

 if (!device->status.present)
  return 0;

 dev = pnp_alloc_dev(&pnpacpi_protocol, num, pnpid);
 if (!dev)
  return -ENOMEM;

 ACPI_COMPANION_SET(&dev->dev, device);
 dev->data = device;
 /* .enabled means the device can decode the resources */
 dev->active = device->status.enabled;
 if (acpi_has_method(device->handle, "_SRS"))
  dev->capabilities |= PNP_CONFIGURABLE;
 dev->capabilities |= PNP_READ;
 if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
  dev->capabilities |= PNP_WRITE;
 if (device->flags.removable)
  dev->capabilities |= PNP_REMOVABLE;
 if (acpi_has_method(device->handle, "_DIS"))
  dev->capabilities |= PNP_DISABLE;

 if (strlen(acpi_device_name(device)))
  strscpy(dev->name, acpi_device_name(device), sizeof(dev->name));
 else
  strscpy(dev->name, acpi_device_bid(device), sizeof(dev->name));

 if (dev->active)
  pnpacpi_parse_allocated_resource(dev);

 if (dev->capabilities & PNP_CONFIGURABLE)
  pnpacpi_parse_resource_option_data(dev);

 list_for_each_entry(id, &device->pnp.ids, list) {
  if (!strcmp(id->id, pnpid))
   continue;
  if (!ispnpidacpi(id->id))
   continue;
  pnp_add_id(dev, id->id);
 }

 /* clear out the damaged flags */
 if (!dev->active)
  pnp_init_resources(dev);

 error = pnp_add_device(dev);
 if (error) {
  put_device(&dev->dev);
  return error;
 }

 num++;

 return 0;
}

static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
           u32 lvl, void *context,
           void **rv)
{
 struct acpi_device *device = acpi_fetch_acpi_dev(handle);

 if (!device)
  return AE_CTRL_DEPTH;
 if (acpi_is_pnp_device(device))
  pnpacpi_add_device(device);
 return AE_OK;
}

int pnpacpi_disabled __initdata;
static int __init pnpacpi_init(void)
{
 if (acpi_disabled || pnpacpi_disabled) {
  printk(KERN_INFO "pnp: PnP ACPI: disabled\n");
  return 0;
 }
 printk(KERN_INFO "pnp: PnP ACPI init\n");
 pnp_register_protocol(&pnpacpi_protocol);
 acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
 pnp_platform_devices = 1;
 return 0;
}

fs_initcall(pnpacpi_init);

static int __init pnpacpi_setup(char *str)
{
 if (str == NULL)
  return 1;
 if (!strncmp(str, "off", 3))
  pnpacpi_disabled = 1;
 return 1;
}

__setup("pnpacpi=", pnpacpi_setup);