// SPDX-License-Identifier: GPL-2.0-or-later
/*
* pnpacpi -- PnP ACPI driver
*
* Copyright (c) 2004 Matthieu Castet <[email protected]>
* Copyright (c) 2004 Li Shaohua <[email protected]>
*/
#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);
Codebase Browser
linux