/* * driver.c - device id matching, driver model, etc. * * Copyright 2002 Adam Belay <ambx1@neo.rr.com> * */ #include <linux/string.h>#include <linux/list.h>#include <linux/module.h>#include <linux/ctype.h>#include <linux/slab.h>#include <linux/pnp.h>#include "base.h" static int compare_func(const char *ida, const char *idb){	int i;	/* we only need to compare the last 4 chars */	for (i=3; i<7; i++)	{		if (ida[i] != 'X' &&		    idb[i] != 'X' &&		    toupper(ida[i]) != toupper(idb[i]))			return 0;	}	return 1;} int compare_pnp_id(struct pnp_id *pos, const char *id){	if (!pos || !id || (strlen(id) != 7))		return 0;	if (memcmp(id,"ANYDEVS",7)==0)		return 1;	while (pos){		if (memcmp(pos->id,id,3)==0)			if (compare_func(pos->id,id)==1)				return 1;		pos = pos->next;	}	return 0;} static const struct pnp_device_id * match_device(struct pnp_driver *drv, struct pnp_dev *dev){	const struct pnp_device_id *drv_id = drv->id_table;	if (!drv_id)		return NULL; 	while (*drv_id->id) {		if (compare_pnp_id(dev->id, drv_id->id))			return drv_id;		drv_id++;	}	return NULL;} int pnp_device_attach(struct pnp_dev *pnp_dev){	spin_lock(&pnp_lock);	if(pnp_dev->status != PNP_READY){		spin_unlock(&pnp_lock);		return -EBUSY;	}	pnp_dev->status = PNP_ATTACHED;	spin_unlock(&pnp_lock);	return 0;} void pnp_device_detach(struct pnp_dev *pnp_dev){	spin_lock(&pnp_lock);	if (pnp_dev->status == PNP_ATTACHED)		pnp_dev->status = PNP_READY;	spin_unlock(&pnp_lock);	pnp_disable_dev(pnp_dev);} static int pnp_device_probe(struct device *dev){	int error;	struct pnp_driver *pnp_drv;	struct pnp_dev *pnp_dev;	const struct pnp_device_id *dev_id = NULL;	pnp_dev = to_pnp_dev(dev);	pnp_drv = to_pnp_driver(dev->driver); 	pnp_dbg("match found with the PnP device '%s' and the driver '%s'", dev->bus_id,pnp_drv->name); 	error = pnp_device_attach(pnp_dev);	if (error < 0)		return error; 	if (pnp_dev->active == 0) {		if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {			error = pnp_activate_dev(pnp_dev);			if (error < 0)				return error;		}	} else if ((pnp_drv->flags & PNP_DRIVER_RES_DISABLE)		    == PNP_DRIVER_RES_DISABLE) {		error = pnp_disable_dev(pnp_dev);		if (error < 0)			return error;	}	error = 0;	if (pnp_drv->probe) {		dev_id = match_device(pnp_drv, pnp_dev);		if (dev_id != NULL)			error = pnp_drv->probe(pnp_dev, dev_id);	}	if (error >= 0){		pnp_dev->driver = pnp_drv;		error = 0;	} else		goto fail;	return error; fail:	pnp_device_detach(pnp_dev);	return error;} static int pnp_device_remove(struct device *dev){	struct pnp_dev * pnp_dev = to_pnp_dev(dev);	struct pnp_driver * drv = pnp_dev->driver; 	if (drv) {		if (drv->remove)			drv->remove(pnp_dev);		pnp_dev->driver = NULL;	}	pnp_device_detach(pnp_dev);	return 0;} static int pnp_bus_match(struct device *dev, struct device_driver *drv){	struct pnp_dev * pnp_dev = to_pnp_dev(dev);	struct pnp_driver * pnp_drv = to_pnp_driver(drv);	if (match_device(pnp_drv, pnp_dev) == NULL)		return 0;	return 1;} static int pnp_bus_suspend(struct device *dev, pm_message_t state){	struct pnp_dev * pnp_dev = to_pnp_dev(dev);	struct pnp_driver * pnp_drv = pnp_dev->driver;	int error; 	if (!pnp_drv)		return 0; 	if (pnp_drv->suspend) {		error = pnp_drv->suspend(pnp_dev, state);		if (error)			return error;	} 	if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE) &&	    pnp_can_disable(pnp_dev)) {	    	error = pnp_stop_dev(pnp_dev);	    	if (error)	    		return error;	} 	return 0;} static int pnp_bus_resume(struct device *dev){	struct pnp_dev * pnp_dev = to_pnp_dev(dev);	struct pnp_driver * pnp_drv = pnp_dev->driver;	int error; 	if (!pnp_drv)		return 0; 	if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {		error = pnp_start_dev(pnp_dev);		if (error)			return error;	} 	if (pnp_drv->resume)		return pnp_drv->resume(pnp_dev); 	return 0;} struct bus_type pnp_bus_type = {	.name	= "pnp",	.match	= pnp_bus_match,	.probe	= pnp_device_probe,	.remove	= pnp_device_remove,	.suspend = pnp_bus_suspend,	.resume = pnp_bus_resume,}; int pnp_register_driver(struct pnp_driver *drv){	pnp_dbg("the driver '%s' has been registered", drv->name); 	drv->driver.name = drv->name;	drv->driver.bus = &pnp_bus_type; 	return driver_register(&drv->driver);} void pnp_unregister_driver(struct pnp_driver *drv){	driver_unregister(&drv->driver);	pnp_dbg("the driver '%s' has been unregistered", drv->name);} /** * pnp_add_id - adds an EISA id to the specified device * @id: pointer to a pnp_id structure * @dev: pointer to the desired device * */ int pnp_add_id(struct pnp_id *id, struct pnp_dev *dev){	struct pnp_id *ptr;	if (!id)		return -EINVAL;	if (!dev)		return -EINVAL;	id->next = NULL;	ptr = dev->id;	while (ptr && ptr->next)		ptr = ptr->next;	if (ptr)		ptr->next = id;	else		dev->id = id;	return 0;} EXPORT_SYMBOL(pnp_register_driver);EXPORT_SYMBOL(pnp_unregister_driver);#if 0EXPORT_SYMBOL(pnp_add_id);#endifEXPORT_SYMBOL(pnp_device_attach);EXPORT_SYMBOL(pnp_device_detach);