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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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5d38998ed1
The PNP_DRIVER_RES_DO_NOT_CHANGE flag is meant to signify that the PNP core
should not change resources for the device -- not that it shouldn't
disable/enable the device on suspend/resume.
ALSA ISAPnP drivers set PNP_DRIVER_RES_DO_NOT_CHANAGE (0x0001) through
setting PNP_DRIVER_RES_DISABLE (0x0003). The latter including the former
may in itself be considered rather unexpected but doesn't change that
suspend/resume wouldn't seem to have any business testing the flag.
As reported by Ondrej Zary for snd-cs4236, ALSA driven ISAPnP cards don't
survive swsusp hibernation with the resume skipping setting the resources
due to testing the flag -- the same test in the suspend path isn't enough
to keep hibernation from disabling the card it seems.
These tests were added (in 2005) by Piere Ossman in commit
68094e3251
, "alsa: Improved PnP suspend
support" who doesn't remember why. This deletes them.
Signed-off-by: Rene Herman <rene.herman@gmail.com>
Tested-by: Ondrej Zary <linux@rainbow-software.org>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Pierre Ossman <drzeus@drzeus.cx>
Cc: Adam Belay <ambx1@neo.rr.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
251 lines
5.0 KiB
C
251 lines
5.0 KiB
C
/*
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* driver.c - device id matching, driver model, etc.
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*
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* Copyright 2002 Adam Belay <ambx1@neo.rr.com>
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*/
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#include <linux/string.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/ctype.h>
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#include <linux/slab.h>
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#include <linux/pnp.h>
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#include "base.h"
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static int compare_func(const char *ida, const char *idb)
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{
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int i;
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/* we only need to compare the last 4 chars */
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for (i = 3; i < 7; i++) {
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if (ida[i] != 'X' &&
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idb[i] != 'X' && toupper(ida[i]) != toupper(idb[i]))
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return 0;
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}
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return 1;
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}
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int compare_pnp_id(struct pnp_id *pos, const char *id)
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{
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if (!pos || !id || (strlen(id) != 7))
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return 0;
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if (memcmp(id, "ANYDEVS", 7) == 0)
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return 1;
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while (pos) {
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if (memcmp(pos->id, id, 3) == 0)
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if (compare_func(pos->id, id) == 1)
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return 1;
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pos = pos->next;
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}
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return 0;
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}
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static const struct pnp_device_id *match_device(struct pnp_driver *drv,
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struct pnp_dev *dev)
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{
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const struct pnp_device_id *drv_id = drv->id_table;
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if (!drv_id)
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return NULL;
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while (*drv_id->id) {
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if (compare_pnp_id(dev->id, drv_id->id))
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return drv_id;
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drv_id++;
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}
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return NULL;
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}
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int pnp_device_attach(struct pnp_dev *pnp_dev)
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{
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spin_lock(&pnp_lock);
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if (pnp_dev->status != PNP_READY) {
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spin_unlock(&pnp_lock);
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return -EBUSY;
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}
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pnp_dev->status = PNP_ATTACHED;
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spin_unlock(&pnp_lock);
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return 0;
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}
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void pnp_device_detach(struct pnp_dev *pnp_dev)
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{
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spin_lock(&pnp_lock);
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if (pnp_dev->status == PNP_ATTACHED)
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pnp_dev->status = PNP_READY;
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spin_unlock(&pnp_lock);
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pnp_disable_dev(pnp_dev);
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}
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static int pnp_device_probe(struct device *dev)
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{
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int error;
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struct pnp_driver *pnp_drv;
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struct pnp_dev *pnp_dev;
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const struct pnp_device_id *dev_id = NULL;
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pnp_dev = to_pnp_dev(dev);
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pnp_drv = to_pnp_driver(dev->driver);
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error = pnp_device_attach(pnp_dev);
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if (error < 0)
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return error;
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if (pnp_dev->active == 0) {
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if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
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error = pnp_activate_dev(pnp_dev);
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if (error < 0)
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return error;
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}
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} else if ((pnp_drv->flags & PNP_DRIVER_RES_DISABLE)
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== PNP_DRIVER_RES_DISABLE) {
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error = pnp_disable_dev(pnp_dev);
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if (error < 0)
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return error;
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}
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error = 0;
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if (pnp_drv->probe) {
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dev_id = match_device(pnp_drv, pnp_dev);
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if (dev_id != NULL)
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error = pnp_drv->probe(pnp_dev, dev_id);
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}
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if (error >= 0) {
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pnp_dev->driver = pnp_drv;
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error = 0;
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} else
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goto fail;
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dev_dbg(dev, "driver attached\n");
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return error;
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fail:
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pnp_device_detach(pnp_dev);
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return error;
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}
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static int pnp_device_remove(struct device *dev)
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{
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struct pnp_dev *pnp_dev = to_pnp_dev(dev);
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struct pnp_driver *drv = pnp_dev->driver;
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if (drv) {
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if (drv->remove)
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drv->remove(pnp_dev);
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pnp_dev->driver = NULL;
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}
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pnp_device_detach(pnp_dev);
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return 0;
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}
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static int pnp_bus_match(struct device *dev, struct device_driver *drv)
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{
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struct pnp_dev *pnp_dev = to_pnp_dev(dev);
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struct pnp_driver *pnp_drv = to_pnp_driver(drv);
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if (match_device(pnp_drv, pnp_dev) == NULL)
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return 0;
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return 1;
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}
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static int pnp_bus_suspend(struct device *dev, pm_message_t state)
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{
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struct pnp_dev *pnp_dev = to_pnp_dev(dev);
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struct pnp_driver *pnp_drv = pnp_dev->driver;
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int error;
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if (!pnp_drv)
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return 0;
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if (pnp_drv->suspend) {
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error = pnp_drv->suspend(pnp_dev, state);
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if (error)
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return error;
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}
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if (pnp_can_disable(pnp_dev)) {
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error = pnp_stop_dev(pnp_dev);
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if (error)
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return error;
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}
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if (pnp_dev->protocol && pnp_dev->protocol->suspend)
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pnp_dev->protocol->suspend(pnp_dev, state);
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return 0;
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}
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static int pnp_bus_resume(struct device *dev)
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{
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struct pnp_dev *pnp_dev = to_pnp_dev(dev);
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struct pnp_driver *pnp_drv = pnp_dev->driver;
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int error;
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if (!pnp_drv)
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return 0;
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if (pnp_dev->protocol && pnp_dev->protocol->resume)
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pnp_dev->protocol->resume(pnp_dev);
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if (pnp_can_write(pnp_dev)) {
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error = pnp_start_dev(pnp_dev);
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if (error)
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return error;
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}
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if (pnp_drv->resume) {
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error = pnp_drv->resume(pnp_dev);
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if (error)
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return error;
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}
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return 0;
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}
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struct bus_type pnp_bus_type = {
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.name = "pnp",
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.match = pnp_bus_match,
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.probe = pnp_device_probe,
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.remove = pnp_device_remove,
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.suspend = pnp_bus_suspend,
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.resume = pnp_bus_resume,
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};
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int pnp_register_driver(struct pnp_driver *drv)
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{
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pnp_dbg("the driver '%s' has been registered", drv->name);
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drv->driver.name = drv->name;
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drv->driver.bus = &pnp_bus_type;
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return driver_register(&drv->driver);
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}
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void pnp_unregister_driver(struct pnp_driver *drv)
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{
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driver_unregister(&drv->driver);
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pnp_dbg("the driver '%s' has been unregistered", drv->name);
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}
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/**
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* pnp_add_id - adds an EISA id to the specified device
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* @id: pointer to a pnp_id structure
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* @dev: pointer to the desired device
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*/
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int pnp_add_id(struct pnp_id *id, struct pnp_dev *dev)
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{
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struct pnp_id *ptr;
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id->next = NULL;
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ptr = dev->id;
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while (ptr && ptr->next)
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ptr = ptr->next;
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if (ptr)
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ptr->next = id;
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else
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dev->id = id;
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return 0;
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}
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EXPORT_SYMBOL(pnp_register_driver);
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EXPORT_SYMBOL(pnp_unregister_driver);
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EXPORT_SYMBOL(pnp_device_attach);
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EXPORT_SYMBOL(pnp_device_detach);
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