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457 lines
10 KiB
457 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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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 <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/mutex.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 <linux/dma-mapping.h> |
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#include "base.h" |
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LIST_HEAD(pnp_cards); |
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static LIST_HEAD(pnp_card_drivers); |
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static const struct pnp_card_device_id *match_card(struct pnp_card_driver *drv, |
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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 || |
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!*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, |
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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; |
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struct pnp_card_link *clink; |
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struct pnp_dev *dev; |
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if (!drv->probe) |
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return 0; |
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id = match_card(drv, card); |
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if (!id) |
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return 0; |
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clink = kzalloc(sizeof(*clink), GFP_KERNEL); |
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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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clink->pm_state = PMSG_ON; |
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if (drv->probe(clink, id) >= 0) |
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return 1; |
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/* Recovery */ |
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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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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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static struct pnp_id *pnp_add_card_id(struct pnp_card *card, 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 = 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 = dev_id; |
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else |
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card->id = dev_id; |
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return dev_id; |
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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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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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struct pnp_card *pnp_alloc_card(struct pnp_protocol *protocol, int id, char *pnpid) |
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{ |
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struct pnp_card *card; |
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struct pnp_id *dev_id; |
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card = kzalloc(sizeof(struct pnp_card), GFP_KERNEL); |
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if (!card) |
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return NULL; |
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card->protocol = protocol; |
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card->number = id; |
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card->dev.parent = &card->protocol->dev; |
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dev_set_name(&card->dev, "%02x:%02x", card->protocol->number, card->number); |
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card->dev.coherent_dma_mask = DMA_BIT_MASK(24); |
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card->dev.dma_mask = &card->dev.coherent_dma_mask; |
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dev_id = pnp_add_card_id(card, pnpid); |
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if (!dev_id) { |
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kfree(card); |
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return NULL; |
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} |
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return card; |
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} |
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static ssize_t name_show(struct device *dmdev, |
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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_RO(name); |
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static ssize_t card_id_show(struct device *dmdev, |
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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_RO(card_id); |
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static int pnp_interface_attach_card(struct pnp_card *card) |
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{ |
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int rc = device_create_file(&card->dev, &dev_attr_name); |
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if (rc) |
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return rc; |
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rc = device_create_file(&card->dev, &dev_attr_card_id); |
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if (rc) |
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goto err_name; |
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return 0; |
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err_name: |
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device_remove_file(&card->dev, &dev_attr_name); |
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return rc; |
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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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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) { |
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dev_err(&card->dev, "could not register (err=%d)\n", error); |
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put_device(&card->dev); |
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return error; |
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} |
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pnp_interface_attach_card(card); |
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mutex_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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mutex_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 an unreasonable 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 = |
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list_entry(pos, struct pnp_card_driver, |
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global_list); |
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card_probe(card, drv); |
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} |
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return 0; |
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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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device_unregister(&card->dev); |
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mutex_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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mutex_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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dev->dev.parent = &card->dev; |
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dev->card_link = NULL; |
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dev_set_name(&dev->dev, "%02x:%02x.%02x", |
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dev->protocol->number, card->number, dev->number); |
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mutex_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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mutex_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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mutex_lock(&pnp_lock); |
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dev->card = NULL; |
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list_del(&dev->card_list); |
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mutex_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 beginning. |
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*/ |
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struct pnp_dev *pnp_request_card_device(struct pnp_card_link *clink, |
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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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return NULL; |
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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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return NULL; |
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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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return NULL; |
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found: |
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dev->card_link = clink; |
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dev->dev.driver = &drv->link.driver; |
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if (pnp_bus_type.probe(&dev->dev)) |
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goto err_out; |
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if (device_bind_driver(&dev->dev)) |
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goto err_out; |
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return dev; |
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err_out: |
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dev->dev.driver = NULL; |
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dev->card_link = NULL; |
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return NULL; |
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} |
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EXPORT_SYMBOL(pnp_request_card_device); |
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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 structure |
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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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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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} |
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EXPORT_SYMBOL(pnp_release_card_device); |
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/* |
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* suspend/resume callbacks |
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*/ |
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static int card_suspend(struct pnp_dev *dev, pm_message_t state) |
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{ |
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struct pnp_card_link *link = dev->card_link; |
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if (link->pm_state.event == state.event) |
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return 0; |
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link->pm_state = state; |
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return link->driver->suspend(link, state); |
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} |
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static int card_resume(struct pnp_dev *dev) |
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{ |
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struct pnp_card_link *link = dev->card_link; |
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if (link->pm_state.event == PM_EVENT_ON) |
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return 0; |
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link->pm_state = PMSG_ON; |
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link->driver->resume(link); |
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return 0; |
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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 error; |
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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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drv->link.suspend = drv->suspend ? card_suspend : NULL; |
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drv->link.resume = drv->resume ? card_resume : NULL; |
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error = pnp_register_driver(&drv->link); |
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if (error < 0) |
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return error; |
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mutex_lock(&pnp_lock); |
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list_add_tail(&drv->global_list, &pnp_card_drivers); |
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mutex_unlock(&pnp_lock); |
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list_for_each_safe(pos, temp, &pnp_cards) { |
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struct pnp_card *card = |
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list_entry(pos, struct pnp_card, global_list); |
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card_probe(card, drv); |
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} |
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return 0; |
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} |
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EXPORT_SYMBOL(pnp_register_card_driver); |
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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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mutex_lock(&pnp_lock); |
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list_del(&drv->global_list); |
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mutex_unlock(&pnp_lock); |
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pnp_unregister_driver(&drv->link); |
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} |
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EXPORT_SYMBOL(pnp_unregister_card_driver);
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