--- /dev/null
+/*
+ * 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);
Code Review / kvmfornfv.git / blobdiff