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![Rafael J. Wysocki](/assets/img/avatar_default.png)
The PNP ACPI driver squirrels the ACPI handles of PNP devices' ACPI companions, but this isn't correct, because those handles should be accessed using the DEVICE_ACPI_HANDLE() macro operating on struct device objects. Using DEVICE_ACPI_HANDLE() in the PNP ACPI driver instead of the driver's own copies of the ACPI handles allows us to avoid a problem with docking stations where a machine docked before suspend to RAM and undocked while suspended crashes during the subsequent resume (in that case the ACPI companion of the PNP device in question doesn't exist any more while the device is being resumed). It also allows us to avoid the problem where suspend to RAM fails when the machine was undocked while suspended before (again, the ACPI companion of the PNP device is not present any more while it is being suspended). This change doesn't fix all of the the PNP ACPI driver's problems with PNP devices in docking stations (generally speaking, the driver has no idea that devices can come and go and doesn't even attempt to handle such events), but at least it makes suspend work for the users of docking stations who don't use the PNP devices located in there. References: https://bugzilla.kernel.org/show_bug.cgi?id=15100 Reported-and-tested-by: Toralf Förster <toralf.foerster@gmx.de> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Len Brown <len.brown@intel.com>
381 lines
9.7 KiB
C
381 lines
9.7 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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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 <acpi/acpi_bus.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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/* We need only to blacklist devices that have already an acpi driver that
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* can't use pnp layer. We don't need to blacklist device that are directly
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* used by the kernel (PCI root, ...), as it is harmless and there were
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* already present in pnpbios. But there is an exception for devices that
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* have irqs (PIC, Timer) because we call acpi_register_gsi.
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* Finally, only devices that have a CRS method need to be in this list.
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*/
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static struct acpi_device_id excluded_id_list[] __initdata = {
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{"PNP0C09", 0}, /* EC */
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{"PNP0C0F", 0}, /* Link device */
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{"PNP0000", 0}, /* PIC */
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{"PNP0100", 0}, /* Timer */
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{"", 0},
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};
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static inline int __init is_exclusive_device(struct acpi_device *dev)
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{
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return (!acpi_match_device_ids(dev, excluded_id_list));
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}
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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 (!('@' <= (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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struct acpi_buffer buffer;
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int ret;
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pnp_dbg(&dev->dev, "set resources\n");
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handle = DEVICE_ACPI_HANDLE(&dev->dev);
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if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &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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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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kfree(buffer.pointer);
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return ret;
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}
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if (ACPI_FAILURE(acpi_set_current_resources(handle, &buffer)))
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ret = -EINVAL;
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else if (acpi_bus_power_manageable(handle))
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ret = acpi_bus_set_power(handle, ACPI_STATE_D0);
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kfree(buffer.pointer);
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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_handle handle;
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int ret;
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dev_dbg(&dev->dev, "disable resources\n");
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handle = DEVICE_ACPI_HANDLE(&dev->dev);
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if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &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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ret = 0;
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if (acpi_bus_power_manageable(handle))
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acpi_bus_set_power(handle, ACPI_STATE_D3);
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/* continue even if acpi_bus_set_power() fails */
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if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DIS", NULL, NULL)))
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ret = -ENODEV;
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return ret;
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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;
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acpi_handle handle;
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handle = DEVICE_ACPI_HANDLE(&dev->dev);
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if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &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(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;
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acpi_handle handle;
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int error = 0;
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handle = DEVICE_ACPI_HANDLE(&dev->dev);
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if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &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_device_sleep_wake(&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_bus_power_manageable(handle)) {
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int power_state = acpi_pm_device_sleep_state(&dev->dev, NULL);
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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;
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/*
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* acpi_bus_set_power() often fails (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_bus_set_power(handle, 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;
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acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
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int error = 0;
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if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &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_device_sleep_wake(&dev->dev, false);
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if (acpi_bus_power_manageable(handle))
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error = acpi_bus_set_power(handle, 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 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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acpi_handle temp = NULL;
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acpi_status status;
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struct pnp_dev *dev;
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char *pnpid;
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struct acpi_hardware_id *id;
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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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status = acpi_get_handle(device->handle, "_CRS", &temp);
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if (ACPI_FAILURE(status))
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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 (is_exclusive_device(device) || !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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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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status = acpi_get_handle(device->handle, "_SRS", &temp);
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if (ACPI_SUCCESS(status))
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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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status = acpi_get_handle(device->handle, "_DIS", &temp);
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if (ACPI_SUCCESS(status))
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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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pnp_add_device(dev);
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num++;
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return AE_OK;
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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;
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if (!acpi_bus_get_device(handle, &device))
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pnpacpi_add_device(device);
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else
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return AE_CTRL_DEPTH;
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return AE_OK;
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}
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static int __init acpi_pnp_match(struct device *dev, void *_pnp)
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{
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struct acpi_device *acpi = to_acpi_device(dev);
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struct pnp_dev *pnp = _pnp;
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/* true means it matched */
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return !acpi_get_physical_device(acpi->handle)
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&& compare_pnp_id(pnp->id, acpi_device_hid(acpi));
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}
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static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
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{
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struct device *adev;
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struct acpi_device *acpi;
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adev = bus_find_device(&acpi_bus_type, NULL,
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to_pnp_dev(dev), acpi_pnp_match);
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if (!adev)
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return -ENODEV;
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acpi = to_acpi_device(adev);
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*handle = acpi->handle;
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put_device(adev);
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return 0;
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}
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/* complete initialization of a PNPACPI device includes having
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* pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
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*/
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static struct acpi_bus_type __initdata acpi_pnp_bus = {
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.bus = &pnp_bus_type,
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.find_device = acpi_pnp_find_device,
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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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register_acpi_bus_type(&acpi_pnp_bus);
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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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unregister_acpi_bus_type(&acpi_pnp_bus);
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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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