492 lines
12 KiB
C
492 lines
12 KiB
C
/*
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* drivers/pci/pci-driver.c
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*
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*/
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#include <linux/pci.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include "pci.h"
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/*
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* Registration of PCI drivers and handling of hot-pluggable devices.
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*/
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/*
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* Dynamic device IDs are disabled for !CONFIG_HOTPLUG
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*/
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struct pci_dynid {
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struct list_head node;
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struct pci_device_id id;
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};
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#ifdef CONFIG_HOTPLUG
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/**
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* store_new_id
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*
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* Adds a new dynamic pci device ID to this driver,
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* and causes the driver to probe for all devices again.
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*/
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static inline ssize_t
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store_new_id(struct device_driver *driver, const char *buf, size_t count)
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{
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struct pci_dynid *dynid;
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struct pci_driver *pdrv = to_pci_driver(driver);
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__u32 vendor=PCI_ANY_ID, device=PCI_ANY_ID, subvendor=PCI_ANY_ID,
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subdevice=PCI_ANY_ID, class=0, class_mask=0;
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unsigned long driver_data=0;
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int fields=0;
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fields = sscanf(buf, "%x %x %x %x %x %x %lux",
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&vendor, &device, &subvendor, &subdevice,
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&class, &class_mask, &driver_data);
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if (fields < 0)
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return -EINVAL;
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dynid = kmalloc(sizeof(*dynid), GFP_KERNEL);
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if (!dynid)
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return -ENOMEM;
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memset(dynid, 0, sizeof(*dynid));
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INIT_LIST_HEAD(&dynid->node);
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dynid->id.vendor = vendor;
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dynid->id.device = device;
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dynid->id.subvendor = subvendor;
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dynid->id.subdevice = subdevice;
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dynid->id.class = class;
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dynid->id.class_mask = class_mask;
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dynid->id.driver_data = pdrv->dynids.use_driver_data ?
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driver_data : 0UL;
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spin_lock(&pdrv->dynids.lock);
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list_add_tail(&pdrv->dynids.list, &dynid->node);
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spin_unlock(&pdrv->dynids.lock);
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if (get_driver(&pdrv->driver)) {
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driver_attach(&pdrv->driver);
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put_driver(&pdrv->driver);
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}
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return count;
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}
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static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
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static void
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pci_free_dynids(struct pci_driver *drv)
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{
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struct pci_dynid *dynid, *n;
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spin_lock(&drv->dynids.lock);
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list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
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list_del(&dynid->node);
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kfree(dynid);
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}
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spin_unlock(&drv->dynids.lock);
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}
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static int
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pci_create_newid_file(struct pci_driver *drv)
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{
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int error = 0;
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if (drv->probe != NULL)
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error = sysfs_create_file(&drv->driver.kobj,
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&driver_attr_new_id.attr);
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return error;
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}
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#else /* !CONFIG_HOTPLUG */
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static inline void pci_free_dynids(struct pci_driver *drv) {}
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static inline int pci_create_newid_file(struct pci_driver *drv)
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{
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return 0;
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}
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#endif
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/**
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* pci_match_id - See if a pci device matches a given pci_id table
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* @ids: array of PCI device id structures to search in
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* @dev: the PCI device structure to match against.
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*
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* Used by a driver to check whether a PCI device present in the
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* system is in its list of supported devices. Returns the matching
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* pci_device_id structure or %NULL if there is no match.
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*
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* Depreciated, don't use this as it will not catch any dynamic ids
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* that a driver might want to check for.
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*/
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const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
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struct pci_dev *dev)
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{
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if (ids) {
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while (ids->vendor || ids->subvendor || ids->class_mask) {
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if (pci_match_one_device(ids, dev))
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return ids;
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ids++;
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}
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}
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return NULL;
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}
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/**
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* pci_match_device - Tell if a PCI device structure has a matching
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* PCI device id structure
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* @ids: array of PCI device id structures to search in
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* @dev: the PCI device structure to match against
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* @drv: the PCI driver to match against
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*
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* Used by a driver to check whether a PCI device present in the
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* system is in its list of supported devices. Returns the matching
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* pci_device_id structure or %NULL if there is no match.
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*/
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const struct pci_device_id *pci_match_device(struct pci_driver *drv,
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struct pci_dev *dev)
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{
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const struct pci_device_id *id;
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struct pci_dynid *dynid;
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id = pci_match_id(drv->id_table, dev);
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if (id)
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return id;
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/* static ids didn't match, lets look at the dynamic ones */
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spin_lock(&drv->dynids.lock);
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list_for_each_entry(dynid, &drv->dynids.list, node) {
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if (pci_match_one_device(&dynid->id, dev)) {
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spin_unlock(&drv->dynids.lock);
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return &dynid->id;
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}
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}
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spin_unlock(&drv->dynids.lock);
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return NULL;
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}
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/**
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* __pci_device_probe()
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*
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* returns 0 on success, else error.
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* side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
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*/
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static int
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__pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
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{
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const struct pci_device_id *id;
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int error = 0;
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if (!pci_dev->driver && drv->probe) {
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error = -ENODEV;
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id = pci_match_device(drv, pci_dev);
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if (id)
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error = drv->probe(pci_dev, id);
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if (error >= 0) {
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pci_dev->driver = drv;
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error = 0;
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}
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}
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return error;
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}
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static int pci_device_probe(struct device * dev)
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{
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int error = 0;
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struct pci_driver *drv;
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struct pci_dev *pci_dev;
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drv = to_pci_driver(dev->driver);
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pci_dev = to_pci_dev(dev);
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pci_dev_get(pci_dev);
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error = __pci_device_probe(drv, pci_dev);
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if (error)
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pci_dev_put(pci_dev);
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return error;
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}
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static int pci_device_remove(struct device * dev)
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{
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struct pci_dev * pci_dev = to_pci_dev(dev);
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struct pci_driver * drv = pci_dev->driver;
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if (drv) {
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if (drv->remove)
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drv->remove(pci_dev);
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pci_dev->driver = NULL;
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}
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/*
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* We would love to complain here if pci_dev->is_enabled is set, that
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* the driver should have called pci_disable_device(), but the
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* unfortunate fact is there are too many odd BIOS and bridge setups
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* that don't like drivers doing that all of the time.
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* Oh well, we can dream of sane hardware when we sleep, no matter how
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* horrible the crap we have to deal with is when we are awake...
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*/
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pci_dev_put(pci_dev);
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return 0;
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}
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static int pci_device_suspend(struct device * dev, pm_message_t state)
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{
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struct pci_dev * pci_dev = to_pci_dev(dev);
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struct pci_driver * drv = pci_dev->driver;
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int i = 0;
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if (drv && drv->suspend)
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i = drv->suspend(pci_dev, state);
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else
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pci_save_state(pci_dev);
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return i;
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}
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/*
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* Default resume method for devices that have no driver provided resume,
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* or not even a driver at all.
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*/
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static void pci_default_resume(struct pci_dev *pci_dev)
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{
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/* restore the PCI config space */
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pci_restore_state(pci_dev);
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/* if the device was enabled before suspend, reenable */
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if (pci_dev->is_enabled)
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pci_enable_device(pci_dev);
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/* if the device was busmaster before the suspend, make it busmaster again */
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if (pci_dev->is_busmaster)
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pci_set_master(pci_dev);
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}
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static int pci_device_resume(struct device * dev)
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{
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struct pci_dev * pci_dev = to_pci_dev(dev);
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struct pci_driver * drv = pci_dev->driver;
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if (drv && drv->resume)
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drv->resume(pci_dev);
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else
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pci_default_resume(pci_dev);
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return 0;
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}
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static void pci_device_shutdown(struct device *dev)
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{
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struct pci_dev *pci_dev = to_pci_dev(dev);
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struct pci_driver *drv = pci_dev->driver;
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if (drv && drv->shutdown)
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drv->shutdown(pci_dev);
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}
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#define kobj_to_pci_driver(obj) container_of(obj, struct device_driver, kobj)
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#define attr_to_driver_attribute(obj) container_of(obj, struct driver_attribute, attr)
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static ssize_t
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pci_driver_attr_show(struct kobject * kobj, struct attribute *attr, char *buf)
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{
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struct device_driver *driver = kobj_to_pci_driver(kobj);
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struct driver_attribute *dattr = attr_to_driver_attribute(attr);
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ssize_t ret;
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if (!get_driver(driver))
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return -ENODEV;
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ret = dattr->show ? dattr->show(driver, buf) : -EIO;
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put_driver(driver);
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return ret;
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}
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static ssize_t
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pci_driver_attr_store(struct kobject * kobj, struct attribute *attr,
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const char *buf, size_t count)
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{
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struct device_driver *driver = kobj_to_pci_driver(kobj);
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struct driver_attribute *dattr = attr_to_driver_attribute(attr);
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ssize_t ret;
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if (!get_driver(driver))
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return -ENODEV;
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ret = dattr->store ? dattr->store(driver, buf, count) : -EIO;
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put_driver(driver);
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return ret;
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}
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static struct sysfs_ops pci_driver_sysfs_ops = {
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.show = pci_driver_attr_show,
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.store = pci_driver_attr_store,
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};
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static struct kobj_type pci_driver_kobj_type = {
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.sysfs_ops = &pci_driver_sysfs_ops,
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};
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/**
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* pci_register_driver - register a new pci driver
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* @drv: the driver structure to register
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*
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* Adds the driver structure to the list of registered drivers.
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* Returns a negative value on error, otherwise 0.
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* If no error occurred, the driver remains registered even if
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* no device was claimed during registration.
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*/
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int pci_register_driver(struct pci_driver *drv)
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{
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int error;
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/* initialize common driver fields */
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drv->driver.name = drv->name;
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drv->driver.bus = &pci_bus_type;
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drv->driver.probe = pci_device_probe;
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drv->driver.remove = pci_device_remove;
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/* FIXME, once all of the existing PCI drivers have been fixed to set
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* the pci shutdown function, this test can go away. */
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if (!drv->driver.shutdown)
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drv->driver.shutdown = pci_device_shutdown;
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drv->driver.owner = drv->owner;
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drv->driver.kobj.ktype = &pci_driver_kobj_type;
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spin_lock_init(&drv->dynids.lock);
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INIT_LIST_HEAD(&drv->dynids.list);
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/* register with core */
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error = driver_register(&drv->driver);
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if (!error)
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error = pci_create_newid_file(drv);
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return error;
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}
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/**
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* pci_unregister_driver - unregister a pci driver
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* @drv: the driver structure to unregister
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*
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* Deletes the driver structure from the list of registered PCI drivers,
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* gives it a chance to clean up by calling its remove() function for
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* each device it was responsible for, and marks those devices as
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* driverless.
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*/
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void
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pci_unregister_driver(struct pci_driver *drv)
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{
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driver_unregister(&drv->driver);
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pci_free_dynids(drv);
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}
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static struct pci_driver pci_compat_driver = {
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.name = "compat"
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};
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/**
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* pci_dev_driver - get the pci_driver of a device
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* @dev: the device to query
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*
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* Returns the appropriate pci_driver structure or %NULL if there is no
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* registered driver for the device.
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*/
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struct pci_driver *
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pci_dev_driver(const struct pci_dev *dev)
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{
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if (dev->driver)
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return dev->driver;
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else {
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int i;
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for(i=0; i<=PCI_ROM_RESOURCE; i++)
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if (dev->resource[i].flags & IORESOURCE_BUSY)
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return &pci_compat_driver;
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}
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return NULL;
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}
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/**
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* pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
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* @ids: array of PCI device id structures to search in
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* @dev: the PCI device structure to match against
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*
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* Used by a driver to check whether a PCI device present in the
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* system is in its list of supported devices.Returns the matching
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* pci_device_id structure or %NULL if there is no match.
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*/
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static int pci_bus_match(struct device *dev, struct device_driver *drv)
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{
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struct pci_dev *pci_dev = to_pci_dev(dev);
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struct pci_driver *pci_drv = to_pci_driver(drv);
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const struct pci_device_id *found_id;
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found_id = pci_match_device(pci_drv, pci_dev);
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if (found_id)
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return 1;
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return 0;
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}
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/**
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* pci_dev_get - increments the reference count of the pci device structure
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* @dev: the device being referenced
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*
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* Each live reference to a device should be refcounted.
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*
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* Drivers for PCI devices should normally record such references in
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* their probe() methods, when they bind to a device, and release
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* them by calling pci_dev_put(), in their disconnect() methods.
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*
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* A pointer to the device with the incremented reference counter is returned.
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*/
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struct pci_dev *pci_dev_get(struct pci_dev *dev)
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{
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if (dev)
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get_device(&dev->dev);
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return dev;
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}
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/**
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* pci_dev_put - release a use of the pci device structure
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* @dev: device that's been disconnected
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*
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* Must be called when a user of a device is finished with it. When the last
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* user of the device calls this function, the memory of the device is freed.
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*/
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void pci_dev_put(struct pci_dev *dev)
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{
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if (dev)
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put_device(&dev->dev);
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}
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#ifndef CONFIG_HOTPLUG
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int pci_hotplug (struct device *dev, char **envp, int num_envp,
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char *buffer, int buffer_size)
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{
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return -ENODEV;
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}
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#endif
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struct bus_type pci_bus_type = {
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.name = "pci",
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.match = pci_bus_match,
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.hotplug = pci_hotplug,
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.suspend = pci_device_suspend,
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.resume = pci_device_resume,
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.dev_attrs = pci_dev_attrs,
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};
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static int __init pci_driver_init(void)
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{
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return bus_register(&pci_bus_type);
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}
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postcore_initcall(pci_driver_init);
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EXPORT_SYMBOL(pci_match_id);
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EXPORT_SYMBOL(pci_match_device);
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EXPORT_SYMBOL(pci_register_driver);
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EXPORT_SYMBOL(pci_unregister_driver);
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EXPORT_SYMBOL(pci_dev_driver);
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EXPORT_SYMBOL(pci_bus_type);
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EXPORT_SYMBOL(pci_dev_get);
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EXPORT_SYMBOL(pci_dev_put);
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