317 lines
6.5 KiB
C
317 lines
6.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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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mutex_lock(&pnp_lock);
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if (pnp_dev->status != PNP_READY) {
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mutex_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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mutex_unlock(&pnp_lock);
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return 0;
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}
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EXPORT_SYMBOL(pnp_device_attach);
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void pnp_device_detach(struct pnp_dev *pnp_dev)
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{
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mutex_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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mutex_unlock(&pnp_lock);
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}
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EXPORT_SYMBOL(pnp_device_detach);
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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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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 void 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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if (pnp_dev->active &&
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(!drv || !(drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)))
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pnp_disable_dev(pnp_dev);
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pnp_device_detach(pnp_dev);
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}
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static void pnp_device_shutdown(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 && drv->shutdown)
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drv->shutdown(pnp_dev);
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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->driver.pm && pnp_drv->driver.pm->suspend) {
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error = pnp_drv->driver.pm->suspend(dev);
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suspend_report_result(dev, pnp_drv->driver.pm->suspend, error);
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if (error)
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return error;
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}
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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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/* can_write is necessary to be able to re-start the device on resume */
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if (pnp_can_disable(pnp_dev) && pnp_can_write(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_can_suspend(pnp_dev))
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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_suspend(struct device *dev)
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{
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return __pnp_bus_suspend(dev, PMSG_SUSPEND);
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}
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static int pnp_bus_freeze(struct device *dev)
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{
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return __pnp_bus_suspend(dev, PMSG_FREEZE);
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}
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static int pnp_bus_poweroff(struct device *dev)
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{
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return __pnp_bus_suspend(dev, PMSG_HIBERNATE);
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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->resume) {
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error = pnp_dev->protocol->resume(pnp_dev);
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if (error)
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return error;
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}
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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->driver.pm && pnp_drv->driver.pm->resume) {
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error = pnp_drv->driver.pm->resume(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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static const struct dev_pm_ops pnp_bus_dev_pm_ops = {
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/* Suspend callbacks */
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.suspend = pnp_bus_suspend,
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.resume = pnp_bus_resume,
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/* Hibernate callbacks */
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.freeze = pnp_bus_freeze,
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.thaw = pnp_bus_resume,
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.poweroff = pnp_bus_poweroff,
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.restore = pnp_bus_resume,
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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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.shutdown = pnp_device_shutdown,
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.pm = &pnp_bus_dev_pm_ops,
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.dev_groups = pnp_dev_groups,
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};
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int pnp_register_driver(struct pnp_driver *drv)
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{
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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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EXPORT_SYMBOL(pnp_register_driver);
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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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}
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EXPORT_SYMBOL(pnp_unregister_driver);
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/**
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* pnp_add_id - adds an EISA id to the specified device
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* @dev: pointer to the desired device
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* @id: pointer to an EISA id string
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*/
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struct pnp_id *pnp_add_id(struct pnp_dev *dev, const char *id)
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{
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struct pnp_id *dev_id, *ptr;
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dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
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if (!dev_id)
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return NULL;
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dev_id->id[0] = id[0];
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dev_id->id[1] = id[1];
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dev_id->id[2] = id[2];
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dev_id->id[3] = tolower(id[3]);
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dev_id->id[4] = tolower(id[4]);
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dev_id->id[5] = tolower(id[5]);
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dev_id->id[6] = tolower(id[6]);
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dev_id->id[7] = '\0';
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dev_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 = dev_id;
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else
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dev->id = dev_id;
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return dev_id;
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}
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