diff options
Diffstat (limited to 'drivers/pnp/card.c')
-rw-r--r-- | drivers/pnp/card.c | 457 |
1 files changed, 457 insertions, 0 deletions
diff --git a/drivers/pnp/card.c b/drivers/pnp/card.c new file mode 100644 index 000000000..31ad9fc3f --- /dev/null +++ b/drivers/pnp/card.c @@ -0,0 +1,457 @@ +/* + * card.c - contains functions for managing groups of PnP devices + * + * Copyright 2002 Adam Belay <ambx1@neo.rr.com> + */ + +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/ctype.h> +#include <linux/slab.h> +#include <linux/pnp.h> +#include <linux/dma-mapping.h> +#include "base.h" + +LIST_HEAD(pnp_cards); +static 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; + struct pnp_card_link *clink; + struct pnp_dev *dev; + + if (!drv->probe) + return 0; + id = match_card(drv, card); + if (!id) + return 0; + + clink = pnp_alloc(sizeof(*clink)); + if (!clink) + return 0; + clink->card = card; + clink->driver = drv; + clink->pm_state = PMSG_ON; + + if (drv->probe(clink, id) >= 0) + return 1; + + /* Recovery */ + card_for_each_dev(card, dev) { + if (dev->card_link == clink) + pnp_release_card_device(dev); + } + kfree(clink); + 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 + */ +static struct pnp_id *pnp_add_card_id(struct pnp_card *card, char *id) +{ + struct pnp_id *dev_id, *ptr; + + dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL); + if (!dev_id) + return NULL; + + dev_id->id[0] = id[0]; + dev_id->id[1] = id[1]; + dev_id->id[2] = id[2]; + dev_id->id[3] = tolower(id[3]); + dev_id->id[4] = tolower(id[4]); + dev_id->id[5] = tolower(id[5]); + dev_id->id[6] = tolower(id[6]); + dev_id->id[7] = '\0'; + + dev_id->next = NULL; + ptr = card->id; + while (ptr && ptr->next) + ptr = ptr->next; + if (ptr) + ptr->next = dev_id; + else + card->id = dev_id; + + return dev_id; +} + +static void pnp_free_card_ids(struct pnp_card *card) +{ + struct pnp_id *id; + struct pnp_id *next; + + 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); +} + +struct pnp_card *pnp_alloc_card(struct pnp_protocol *protocol, int id, char *pnpid) +{ + struct pnp_card *card; + struct pnp_id *dev_id; + + card = kzalloc(sizeof(struct pnp_card), GFP_KERNEL); + if (!card) + return NULL; + + card->protocol = protocol; + card->number = id; + + card->dev.parent = &card->protocol->dev; + dev_set_name(&card->dev, "%02x:%02x", card->protocol->number, card->number); + + card->dev.coherent_dma_mask = DMA_BIT_MASK(24); + card->dev.dma_mask = &card->dev.coherent_dma_mask; + + dev_id = pnp_add_card_id(card, pnpid); + if (!dev_id) { + kfree(card); + return NULL; + } + + return card; +} + +static ssize_t pnp_show_card_name(struct device *dmdev, + struct device_attribute *attr, 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, + struct device_attribute *attr, 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) +{ + int rc = device_create_file(&card->dev, &dev_attr_name); + + if (rc) + return rc; + + rc = device_create_file(&card->dev, &dev_attr_card_id); + if (rc) + goto err_name; + + return 0; + +err_name: + device_remove_file(&card->dev, &dev_attr_name); + return rc; +} + +/** + * 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; + + card->dev.bus = NULL; + card->dev.release = &pnp_release_card; + error = device_register(&card->dev); + if (error) { + dev_err(&card->dev, "could not register (err=%d)\n", error); + put_device(&card->dev); + return error; + } + + pnp_interface_attach_card(card); + mutex_lock(&pnp_lock); + list_add_tail(&card->global_list, &pnp_cards); + list_add_tail(&card->protocol_list, &card->protocol->cards); + mutex_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 an unreasonable 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); + } + return 0; +} + +/** + * 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; + + device_unregister(&card->dev); + mutex_lock(&pnp_lock); + list_del(&card->global_list); + list_del(&card->protocol_list); + mutex_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) +{ + dev->dev.parent = &card->dev; + dev->card_link = NULL; + dev_set_name(&dev->dev, "%02x:%02x.%02x", + dev->protocol->number, card->number, dev->number); + mutex_lock(&pnp_lock); + dev->card = card; + list_add_tail(&dev->card_list, &card->devices); + mutex_unlock(&pnp_lock); + return 0; +} + +/** + * pnp_remove_card_device- removes a device from the specified card + * @dev: pointer to the device to remove + */ +void pnp_remove_card_device(struct pnp_dev *dev) +{ + mutex_lock(&pnp_lock); + dev->card = NULL; + list_del(&dev->card_list); + mutex_unlock(&pnp_lock); + __pnp_remove_device(dev); +} + +/** + * pnp_request_card_device - Searches for a PnP device under the specified card + * @clink: 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 beginning. + */ +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) + return NULL; + + card = clink->card; + drv = clink->driver; + if (!from) { + pos = card->devices.next; + } else { + if (from->card != card) + return NULL; + 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; + } + + return NULL; + +found: + dev->card_link = clink; + dev->dev.driver = &drv->link.driver; + if (pnp_bus_type.probe(&dev->dev)) + goto err_out; + if (device_bind_driver(&dev->dev)) + goto err_out; + + return dev; + +err_out: + dev->dev.driver = NULL; + dev->card_link = NULL; + return NULL; +} + +/** + * pnp_release_card_device - call this when the driver no longer needs the device + * @dev: pointer to the PnP device structure + */ +void pnp_release_card_device(struct pnp_dev *dev) +{ + struct pnp_card_driver *drv = dev->card_link->driver; + + drv->link.remove = &card_remove; + device_release_driver(&dev->dev); + drv->link.remove = &card_remove_first; +} + +/* + * suspend/resume callbacks + */ +static int card_suspend(struct pnp_dev *dev, pm_message_t state) +{ + struct pnp_card_link *link = dev->card_link; + + if (link->pm_state.event == state.event) + return 0; + link->pm_state = state; + return link->driver->suspend(link, state); +} + +static int card_resume(struct pnp_dev *dev) +{ + struct pnp_card_link *link = dev->card_link; + + if (link->pm_state.event == PM_EVENT_ON) + return 0; + link->pm_state = PMSG_ON; + link->driver->resume(link); + return 0; +} + +/** + * 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 error; + 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; + drv->link.suspend = drv->suspend ? card_suspend : NULL; + drv->link.resume = drv->resume ? card_resume : NULL; + + error = pnp_register_driver(&drv->link); + if (error < 0) + return error; + + mutex_lock(&pnp_lock); + list_add_tail(&drv->global_list, &pnp_card_drivers); + mutex_unlock(&pnp_lock); + + list_for_each_safe(pos, temp, &pnp_cards) { + struct pnp_card *card = + list_entry(pos, struct pnp_card, global_list); + card_probe(card, drv); + } + return 0; +} + +/** + * 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) +{ + mutex_lock(&pnp_lock); + list_del(&drv->global_list); + mutex_unlock(&pnp_lock); + pnp_unregister_driver(&drv->link); +} + +EXPORT_SYMBOL(pnp_request_card_device); +EXPORT_SYMBOL(pnp_release_card_device); +EXPORT_SYMBOL(pnp_register_card_driver); +EXPORT_SYMBOL(pnp_unregister_card_driver); |