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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/pnp/card.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/pnp/card.c')
-rw-r--r-- | drivers/pnp/card.c | 391 |
1 files changed, 391 insertions, 0 deletions
diff --git a/drivers/pnp/card.c b/drivers/pnp/card.c new file mode 100644 index 000000000000..97eeecfaef1b --- /dev/null +++ b/drivers/pnp/card.c @@ -0,0 +1,391 @@ +/* + * card.c - contains functions for managing groups of PnP devices + * + * Copyright 2002 Adam Belay <ambx1@neo.rr.com> + * + */ + +#include <linux/config.h> +#include <linux/module.h> +#include <linux/slab.h> + +#ifdef CONFIG_PNP_DEBUG + #define DEBUG +#else + #undef DEBUG +#endif + +#include <linux/pnp.h> +#include "base.h" + +LIST_HEAD(pnp_cards); +LIST_HEAD(pnp_card_drivers); + + +static const struct pnp_card_device_id * match_card(struct pnp_card_driver * drv, struct pnp_card * card) +{ + const struct pnp_card_device_id * drv_id = drv->id_table; + while (*drv_id->id){ + if (compare_pnp_id(card->id,drv_id->id)) { + int i = 0; + for (;;) { + int found; + struct pnp_dev *dev; + if (i == PNP_MAX_DEVICES || ! *drv_id->devs[i].id) + return drv_id; + found = 0; + card_for_each_dev(card, dev) { + if (compare_pnp_id(dev->id, drv_id->devs[i].id)) { + found = 1; + break; + } + } + if (! found) + break; + i++; + } + } + drv_id++; + } + return NULL; +} + +static void card_remove(struct pnp_dev * dev) +{ + dev->card_link = NULL; +} + +static void card_remove_first(struct pnp_dev * dev) +{ + struct pnp_card_driver * drv = to_pnp_card_driver(dev->driver); + if (!dev->card || !drv) + return; + if (drv->remove) + drv->remove(dev->card_link); + drv->link.remove = &card_remove; + kfree(dev->card_link); + card_remove(dev); +} + +static int card_probe(struct pnp_card * card, struct pnp_card_driver * drv) +{ + const struct pnp_card_device_id *id = match_card(drv,card); + if (id) { + struct pnp_card_link * clink = pnp_alloc(sizeof(struct pnp_card_link)); + if (!clink) + return 0; + clink->card = card; + clink->driver = drv; + if (drv->probe) { + if (drv->probe(clink, id)>=0) + return 1; + else { + struct pnp_dev * dev; + card_for_each_dev(card, dev) { + if (dev->card_link == clink) + pnp_release_card_device(dev); + } + kfree(clink); + } + } else + return 1; + } + return 0; +} + +/** + * pnp_add_card_id - adds an EISA id to the specified card + * @id: pointer to a pnp_id structure + * @card: pointer to the desired card + * + */ + +int pnp_add_card_id(struct pnp_id *id, struct pnp_card * card) +{ + struct pnp_id * ptr; + if (!id) + return -EINVAL; + if (!card) + return -EINVAL; + id->next = NULL; + ptr = card->id; + while (ptr && ptr->next) + ptr = ptr->next; + if (ptr) + ptr->next = id; + else + card->id = id; + return 0; +} + +static void pnp_free_card_ids(struct pnp_card * card) +{ + struct pnp_id * id; + struct pnp_id *next; + if (!card) + return; + id = card->id; + while (id) { + next = id->next; + kfree(id); + id = next; + } +} + +static void pnp_release_card(struct device *dmdev) +{ + struct pnp_card * card = to_pnp_card(dmdev); + pnp_free_card_ids(card); + kfree(card); +} + + +static ssize_t pnp_show_card_name(struct device *dmdev, char *buf) +{ + char *str = buf; + struct pnp_card *card = to_pnp_card(dmdev); + str += sprintf(str,"%s\n", card->name); + return (str - buf); +} + +static DEVICE_ATTR(name,S_IRUGO,pnp_show_card_name,NULL); + +static ssize_t pnp_show_card_ids(struct device *dmdev, char *buf) +{ + char *str = buf; + struct pnp_card *card = to_pnp_card(dmdev); + struct pnp_id * pos = card->id; + + while (pos) { + str += sprintf(str,"%s\n", pos->id); + pos = pos->next; + } + return (str - buf); +} + +static DEVICE_ATTR(card_id,S_IRUGO,pnp_show_card_ids,NULL); + +static int pnp_interface_attach_card(struct pnp_card *card) +{ + device_create_file(&card->dev,&dev_attr_name); + device_create_file(&card->dev,&dev_attr_card_id); + return 0; +} + +/** + * pnp_add_card - adds a PnP card to the PnP Layer + * @card: pointer to the card to add + */ + +int pnp_add_card(struct pnp_card * card) +{ + int error; + struct list_head * pos, * temp; + if (!card || !card->protocol) + return -EINVAL; + + sprintf(card->dev.bus_id, "%02x:%02x", card->protocol->number, card->number); + card->dev.parent = &card->protocol->dev; + card->dev.bus = NULL; + card->dev.release = &pnp_release_card; + error = device_register(&card->dev); + + if (error == 0) { + pnp_interface_attach_card(card); + spin_lock(&pnp_lock); + list_add_tail(&card->global_list, &pnp_cards); + list_add_tail(&card->protocol_list, &card->protocol->cards); + spin_unlock(&pnp_lock); + + /* we wait until now to add devices in order to ensure the drivers + * will be able to use all of the related devices on the card + * without waiting any unresonable length of time */ + list_for_each(pos,&card->devices){ + struct pnp_dev *dev = card_to_pnp_dev(pos); + __pnp_add_device(dev); + } + + /* match with card drivers */ + list_for_each_safe(pos,temp,&pnp_card_drivers){ + struct pnp_card_driver * drv = list_entry(pos, struct pnp_card_driver, global_list); + card_probe(card,drv); + } + } else + pnp_err("sysfs failure, card '%s' will be unavailable", card->dev.bus_id); + return error; +} + +/** + * pnp_remove_card - removes a PnP card from the PnP Layer + * @card: pointer to the card to remove + */ + +void pnp_remove_card(struct pnp_card * card) +{ + struct list_head *pos, *temp; + if (!card) + return; + device_unregister(&card->dev); + spin_lock(&pnp_lock); + list_del(&card->global_list); + list_del(&card->protocol_list); + spin_unlock(&pnp_lock); + list_for_each_safe(pos,temp,&card->devices){ + struct pnp_dev *dev = card_to_pnp_dev(pos); + pnp_remove_card_device(dev); + } +} + +/** + * pnp_add_card_device - adds a device to the specified card + * @card: pointer to the card to add to + * @dev: pointer to the device to add + */ + +int pnp_add_card_device(struct pnp_card * card, struct pnp_dev * dev) +{ + if (!card || !dev || !dev->protocol) + return -EINVAL; + dev->dev.parent = &card->dev; + dev->card_link = NULL; + snprintf(dev->dev.bus_id, BUS_ID_SIZE, "%02x:%02x.%02x", dev->protocol->number, + card->number,dev->number); + spin_lock(&pnp_lock); + dev->card = card; + list_add_tail(&dev->card_list, &card->devices); + spin_unlock(&pnp_lock); + return 0; +} + +/** + * pnp_remove_card_device- removes a device from the specified card + * @card: pointer to the card to remove from + * @dev: pointer to the device to remove + */ + +void pnp_remove_card_device(struct pnp_dev * dev) +{ + spin_lock(&pnp_lock); + dev->card = NULL; + list_del(&dev->card_list); + spin_unlock(&pnp_lock); + __pnp_remove_device(dev); +} + +/** + * pnp_request_card_device - Searches for a PnP device under the specified card + * @lcard: pointer to the card link, cannot be NULL + * @id: pointer to a PnP ID structure that explains the rules for finding the device + * @from: Starting place to search from. If NULL it will start from the begining. + */ + +struct pnp_dev * pnp_request_card_device(struct pnp_card_link *clink, const char * id, struct pnp_dev * from) +{ + struct list_head * pos; + struct pnp_dev * dev; + struct pnp_card_driver * drv; + struct pnp_card * card; + if (!clink || !id) + goto done; + card = clink->card; + drv = clink->driver; + if (!from) { + pos = card->devices.next; + } else { + if (from->card != card) + goto done; + pos = from->card_list.next; + } + while (pos != &card->devices) { + dev = card_to_pnp_dev(pos); + if ((!dev->card_link) && compare_pnp_id(dev->id,id)) + goto found; + pos = pos->next; + } + +done: + return NULL; + +found: + down_write(&dev->dev.bus->subsys.rwsem); + dev->card_link = clink; + dev->dev.driver = &drv->link.driver; + if (drv->link.driver.probe) { + if (drv->link.driver.probe(&dev->dev)) { + dev->dev.driver = NULL; + return NULL; + } + } + device_bind_driver(&dev->dev); + up_write(&dev->dev.bus->subsys.rwsem); + + return dev; +} + +/** + * pnp_release_card_device - call this when the driver no longer needs the device + * @dev: pointer to the PnP device stucture + */ + +void pnp_release_card_device(struct pnp_dev * dev) +{ + struct pnp_card_driver * drv = dev->card_link->driver; + if (!drv) + return; + down_write(&dev->dev.bus->subsys.rwsem); + drv->link.remove = &card_remove; + device_release_driver(&dev->dev); + drv->link.remove = &card_remove_first; + up_write(&dev->dev.bus->subsys.rwsem); +} + +/** + * pnp_register_card_driver - registers a PnP card driver with the PnP Layer + * @drv: pointer to the driver to register + */ + +int pnp_register_card_driver(struct pnp_card_driver * drv) +{ + int count = 0; + struct list_head *pos, *temp; + + drv->link.name = drv->name; + drv->link.id_table = NULL; /* this will disable auto matching */ + drv->link.flags = drv->flags; + drv->link.probe = NULL; + drv->link.remove = &card_remove_first; + + spin_lock(&pnp_lock); + list_add_tail(&drv->global_list, &pnp_card_drivers); + spin_unlock(&pnp_lock); + pnp_register_driver(&drv->link); + + list_for_each_safe(pos,temp,&pnp_cards){ + struct pnp_card *card = list_entry(pos, struct pnp_card, global_list); + count += card_probe(card,drv); + } + return count; +} + +/** + * pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer + * @drv: pointer to the driver to unregister + */ + +void pnp_unregister_card_driver(struct pnp_card_driver * drv) +{ + spin_lock(&pnp_lock); + list_del(&drv->global_list); + spin_unlock(&pnp_lock); + pnp_unregister_driver(&drv->link); +} + +EXPORT_SYMBOL(pnp_add_card); +EXPORT_SYMBOL(pnp_remove_card); +EXPORT_SYMBOL(pnp_add_card_device); +EXPORT_SYMBOL(pnp_remove_card_device); +EXPORT_SYMBOL(pnp_add_card_id); +EXPORT_SYMBOL(pnp_request_card_device); +EXPORT_SYMBOL(pnp_release_card_device); +EXPORT_SYMBOL(pnp_register_card_driver); +EXPORT_SYMBOL(pnp_unregister_card_driver); |