386 lines
9.0 KiB
C
386 lines
9.0 KiB
C
/*
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* card.c - contains functions for managing groups of PnP devices
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*
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* Copyright 2002 Adam Belay <ambx1@neo.rr.com>
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*
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*/
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#include <linux/config.h>
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#include <linux/module.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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LIST_HEAD(pnp_cards);
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LIST_HEAD(pnp_card_drivers);
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static const struct pnp_card_device_id * match_card(struct pnp_card_driver * drv, struct pnp_card * card)
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{
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const struct pnp_card_device_id * drv_id = drv->id_table;
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while (*drv_id->id){
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if (compare_pnp_id(card->id,drv_id->id)) {
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int i = 0;
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for (;;) {
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int found;
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struct pnp_dev *dev;
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if (i == PNP_MAX_DEVICES || ! *drv_id->devs[i].id)
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return drv_id;
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found = 0;
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card_for_each_dev(card, dev) {
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if (compare_pnp_id(dev->id, drv_id->devs[i].id)) {
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found = 1;
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break;
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}
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}
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if (! found)
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break;
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i++;
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}
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}
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drv_id++;
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}
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return NULL;
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}
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static void card_remove(struct pnp_dev * dev)
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{
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dev->card_link = NULL;
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}
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static void card_remove_first(struct pnp_dev * dev)
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{
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struct pnp_card_driver * drv = to_pnp_card_driver(dev->driver);
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if (!dev->card || !drv)
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return;
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if (drv->remove)
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drv->remove(dev->card_link);
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drv->link.remove = &card_remove;
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kfree(dev->card_link);
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card_remove(dev);
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}
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static int card_probe(struct pnp_card * card, struct pnp_card_driver * drv)
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{
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const struct pnp_card_device_id *id = match_card(drv,card);
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if (id) {
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struct pnp_card_link * clink = pnp_alloc(sizeof(struct pnp_card_link));
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if (!clink)
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return 0;
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clink->card = card;
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clink->driver = drv;
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if (drv->probe) {
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if (drv->probe(clink, id)>=0)
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return 1;
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else {
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struct pnp_dev * dev;
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card_for_each_dev(card, dev) {
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if (dev->card_link == clink)
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pnp_release_card_device(dev);
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}
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kfree(clink);
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}
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} else
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return 1;
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}
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return 0;
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}
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/**
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* pnp_add_card_id - adds an EISA id to the specified card
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* @id: pointer to a pnp_id structure
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* @card: pointer to the desired card
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*
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*/
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int pnp_add_card_id(struct pnp_id *id, struct pnp_card * card)
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{
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struct pnp_id * ptr;
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if (!id)
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return -EINVAL;
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if (!card)
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return -EINVAL;
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id->next = NULL;
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ptr = card->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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card->id = id;
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return 0;
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}
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static void pnp_free_card_ids(struct pnp_card * card)
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{
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struct pnp_id * id;
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struct pnp_id *next;
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if (!card)
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return;
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id = card->id;
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while (id) {
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next = id->next;
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kfree(id);
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id = next;
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}
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}
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static void pnp_release_card(struct device *dmdev)
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{
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struct pnp_card * card = to_pnp_card(dmdev);
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pnp_free_card_ids(card);
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kfree(card);
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}
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static ssize_t pnp_show_card_name(struct device *dmdev, struct device_attribute *attr, char *buf)
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{
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char *str = buf;
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struct pnp_card *card = to_pnp_card(dmdev);
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str += sprintf(str,"%s\n", card->name);
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return (str - buf);
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}
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static DEVICE_ATTR(name,S_IRUGO,pnp_show_card_name,NULL);
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static ssize_t pnp_show_card_ids(struct device *dmdev, struct device_attribute *attr, char *buf)
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{
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char *str = buf;
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struct pnp_card *card = to_pnp_card(dmdev);
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struct pnp_id * pos = card->id;
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while (pos) {
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str += sprintf(str,"%s\n", pos->id);
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pos = pos->next;
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}
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return (str - buf);
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}
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static DEVICE_ATTR(card_id,S_IRUGO,pnp_show_card_ids,NULL);
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static int pnp_interface_attach_card(struct pnp_card *card)
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{
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device_create_file(&card->dev,&dev_attr_name);
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device_create_file(&card->dev,&dev_attr_card_id);
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return 0;
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}
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/**
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* pnp_add_card - adds a PnP card to the PnP Layer
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* @card: pointer to the card to add
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*/
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int pnp_add_card(struct pnp_card * card)
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{
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int error;
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struct list_head * pos, * temp;
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if (!card || !card->protocol)
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return -EINVAL;
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sprintf(card->dev.bus_id, "%02x:%02x", card->protocol->number, card->number);
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card->dev.parent = &card->protocol->dev;
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card->dev.bus = NULL;
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card->dev.release = &pnp_release_card;
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error = device_register(&card->dev);
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if (error == 0) {
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pnp_interface_attach_card(card);
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spin_lock(&pnp_lock);
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list_add_tail(&card->global_list, &pnp_cards);
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list_add_tail(&card->protocol_list, &card->protocol->cards);
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spin_unlock(&pnp_lock);
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/* we wait until now to add devices in order to ensure the drivers
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* will be able to use all of the related devices on the card
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* without waiting any unresonable length of time */
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list_for_each(pos,&card->devices){
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struct pnp_dev *dev = card_to_pnp_dev(pos);
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__pnp_add_device(dev);
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}
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/* match with card drivers */
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list_for_each_safe(pos,temp,&pnp_card_drivers){
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struct pnp_card_driver * drv = list_entry(pos, struct pnp_card_driver, global_list);
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card_probe(card,drv);
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}
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} else
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pnp_err("sysfs failure, card '%s' will be unavailable", card->dev.bus_id);
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return error;
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}
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/**
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* pnp_remove_card - removes a PnP card from the PnP Layer
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* @card: pointer to the card to remove
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*/
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void pnp_remove_card(struct pnp_card * card)
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{
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struct list_head *pos, *temp;
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if (!card)
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return;
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device_unregister(&card->dev);
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spin_lock(&pnp_lock);
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list_del(&card->global_list);
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list_del(&card->protocol_list);
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spin_unlock(&pnp_lock);
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list_for_each_safe(pos,temp,&card->devices){
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struct pnp_dev *dev = card_to_pnp_dev(pos);
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pnp_remove_card_device(dev);
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}
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}
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/**
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* pnp_add_card_device - adds a device to the specified card
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* @card: pointer to the card to add to
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* @dev: pointer to the device to add
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*/
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int pnp_add_card_device(struct pnp_card * card, struct pnp_dev * dev)
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{
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if (!card || !dev || !dev->protocol)
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return -EINVAL;
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dev->dev.parent = &card->dev;
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dev->card_link = NULL;
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snprintf(dev->dev.bus_id, BUS_ID_SIZE, "%02x:%02x.%02x", dev->protocol->number,
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card->number,dev->number);
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spin_lock(&pnp_lock);
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dev->card = card;
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list_add_tail(&dev->card_list, &card->devices);
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spin_unlock(&pnp_lock);
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return 0;
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}
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/**
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* pnp_remove_card_device- removes a device from the specified card
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* @dev: pointer to the device to remove
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*/
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void pnp_remove_card_device(struct pnp_dev * dev)
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{
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spin_lock(&pnp_lock);
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dev->card = NULL;
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list_del(&dev->card_list);
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spin_unlock(&pnp_lock);
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__pnp_remove_device(dev);
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}
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/**
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* pnp_request_card_device - Searches for a PnP device under the specified card
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* @clink: pointer to the card link, cannot be NULL
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* @id: pointer to a PnP ID structure that explains the rules for finding the device
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* @from: Starting place to search from. If NULL it will start from the begining.
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*/
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struct pnp_dev * pnp_request_card_device(struct pnp_card_link *clink, const char * id, struct pnp_dev * from)
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{
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struct list_head * pos;
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struct pnp_dev * dev;
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struct pnp_card_driver * drv;
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struct pnp_card * card;
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if (!clink || !id)
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goto done;
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card = clink->card;
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drv = clink->driver;
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if (!from) {
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pos = card->devices.next;
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} else {
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if (from->card != card)
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goto done;
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pos = from->card_list.next;
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}
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while (pos != &card->devices) {
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dev = card_to_pnp_dev(pos);
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if ((!dev->card_link) && compare_pnp_id(dev->id,id))
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goto found;
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pos = pos->next;
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}
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done:
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return NULL;
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found:
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down_write(&dev->dev.bus->subsys.rwsem);
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dev->card_link = clink;
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dev->dev.driver = &drv->link.driver;
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if (drv->link.driver.probe) {
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if (drv->link.driver.probe(&dev->dev)) {
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dev->dev.driver = NULL;
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dev->card_link = NULL;
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up_write(&dev->dev.bus->subsys.rwsem);
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return NULL;
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}
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}
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device_bind_driver(&dev->dev);
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up_write(&dev->dev.bus->subsys.rwsem);
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return dev;
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}
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/**
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* pnp_release_card_device - call this when the driver no longer needs the device
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* @dev: pointer to the PnP device stucture
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*/
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void pnp_release_card_device(struct pnp_dev * dev)
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{
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struct pnp_card_driver * drv = dev->card_link->driver;
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if (!drv)
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return;
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down_write(&dev->dev.bus->subsys.rwsem);
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drv->link.remove = &card_remove;
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device_release_driver(&dev->dev);
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drv->link.remove = &card_remove_first;
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up_write(&dev->dev.bus->subsys.rwsem);
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}
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/**
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* pnp_register_card_driver - registers a PnP card driver with the PnP Layer
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* @drv: pointer to the driver to register
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*/
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int pnp_register_card_driver(struct pnp_card_driver * drv)
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{
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int count = 0;
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struct list_head *pos, *temp;
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drv->link.name = drv->name;
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drv->link.id_table = NULL; /* this will disable auto matching */
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drv->link.flags = drv->flags;
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drv->link.probe = NULL;
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drv->link.remove = &card_remove_first;
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spin_lock(&pnp_lock);
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list_add_tail(&drv->global_list, &pnp_card_drivers);
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spin_unlock(&pnp_lock);
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pnp_register_driver(&drv->link);
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list_for_each_safe(pos,temp,&pnp_cards){
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struct pnp_card *card = list_entry(pos, struct pnp_card, global_list);
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count += card_probe(card,drv);
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}
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return count;
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}
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/**
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* pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer
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* @drv: pointer to the driver to unregister
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*/
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void pnp_unregister_card_driver(struct pnp_card_driver * drv)
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{
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spin_lock(&pnp_lock);
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list_del(&drv->global_list);
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spin_unlock(&pnp_lock);
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pnp_unregister_driver(&drv->link);
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}
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EXPORT_SYMBOL(pnp_add_card);
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EXPORT_SYMBOL(pnp_remove_card);
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EXPORT_SYMBOL(pnp_add_card_device);
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EXPORT_SYMBOL(pnp_remove_card_device);
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EXPORT_SYMBOL(pnp_add_card_id);
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EXPORT_SYMBOL(pnp_request_card_device);
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EXPORT_SYMBOL(pnp_release_card_device);
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EXPORT_SYMBOL(pnp_register_card_driver);
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EXPORT_SYMBOL(pnp_unregister_card_driver);
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