diff options
Diffstat (limited to 'drivers/pnp/driver.c')
| -rw-r--r-- | drivers/pnp/driver.c | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/drivers/pnp/driver.c b/drivers/pnp/driver.c new file mode 100644 index 00000000000..d64c1ca4fa7 --- /dev/null +++ b/drivers/pnp/driver.c @@ -0,0 +1,222 @@ +/* + * driver.c - device id matching, driver model, etc. + * + * Copyright 2002 Adam Belay <ambx1@neo.rr.com> + * + */ + +#include <linux/config.h> +#include <linux/string.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/ctype.h> +#include <linux/slab.h> + +#ifdef CONFIG_PNP_DEBUG + #define DEBUG +#else + #undef DEBUG +#endif + +#include <linux/pnp.h> +#include "base.h" + +static int compare_func(const char *ida, const char *idb) +{ + int i; + /* we only need to compare the last 4 chars */ + for (i=3; i<7; i++) + { + if (ida[i] != 'X' && + idb[i] != 'X' && + toupper(ida[i]) != toupper(idb[i])) + return 0; + } + return 1; +} + +int compare_pnp_id(struct pnp_id *pos, const char *id) +{ + if (!pos || !id || (strlen(id) != 7)) + return 0; + if (memcmp(id,"ANYDEVS",7)==0) + return 1; + while (pos){ + if (memcmp(pos->id,id,3)==0) + if (compare_func(pos->id,id)==1) + return 1; + pos = pos->next; + } + return 0; +} + +static const struct pnp_device_id * match_device(struct pnp_driver *drv, struct pnp_dev *dev) +{ + const struct pnp_device_id *drv_id = drv->id_table; + if (!drv_id) + return NULL; + + while (*drv_id->id) { + if (compare_pnp_id(dev->id, drv_id->id)) + return drv_id; + drv_id++; + } + return NULL; +} + +int pnp_device_attach(struct pnp_dev *pnp_dev) +{ + spin_lock(&pnp_lock); + if(pnp_dev->status != PNP_READY){ + spin_unlock(&pnp_lock); + return -EBUSY; + } + pnp_dev->status = PNP_ATTACHED; + spin_unlock(&pnp_lock); + return 0; +} + +void pnp_device_detach(struct pnp_dev *pnp_dev) +{ + spin_lock(&pnp_lock); + if (pnp_dev->status == PNP_ATTACHED) + pnp_dev->status = PNP_READY; + spin_unlock(&pnp_lock); + pnp_disable_dev(pnp_dev); +} + +static int pnp_device_probe(struct device *dev) +{ + int error; + struct pnp_driver *pnp_drv; + struct pnp_dev *pnp_dev; + const struct pnp_device_id *dev_id = NULL; + pnp_dev = to_pnp_dev(dev); + pnp_drv = to_pnp_driver(dev->driver); + + pnp_dbg("match found with the PnP device '%s' and the driver '%s'", dev->bus_id,pnp_drv->name); + + error = pnp_device_attach(pnp_dev); + if (error < 0) + return error; + + if (pnp_dev->active == 0) { + if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) { + error = pnp_activate_dev(pnp_dev); + if (error < 0) + return error; + } + } else if ((pnp_drv->flags & PNP_DRIVER_RES_DISABLE) + == PNP_DRIVER_RES_DISABLE) { + error = pnp_disable_dev(pnp_dev); + if (error < 0) + return error; + } + error = 0; + if (pnp_drv->probe) { + dev_id = match_device(pnp_drv, pnp_dev); + if (dev_id != NULL) + error = pnp_drv->probe(pnp_dev, dev_id); + } + if (error >= 0){ + pnp_dev->driver = pnp_drv; + error = 0; + } else + goto fail; + return error; + +fail: + pnp_device_detach(pnp_dev); + return error; +} + +static int pnp_device_remove(struct device *dev) +{ + struct pnp_dev * pnp_dev = to_pnp_dev(dev); + struct pnp_driver * drv = pnp_dev->driver; + + if (drv) { + if (drv->remove) + drv->remove(pnp_dev); + pnp_dev->driver = NULL; + } + pnp_device_detach(pnp_dev); + return 0; +} + +static int pnp_bus_match(struct device *dev, struct device_driver *drv) +{ + struct pnp_dev * pnp_dev = to_pnp_dev(dev); + struct pnp_driver * pnp_drv = to_pnp_driver(drv); + if (match_device(pnp_drv, pnp_dev) == NULL) + return 0; + return 1; +} + + +struct bus_type pnp_bus_type = { + .name = "pnp", + .match = pnp_bus_match, +}; + + +int pnp_register_driver(struct pnp_driver *drv) +{ + int count; + struct list_head *pos; + + pnp_dbg("the driver '%s' has been registered", drv->name); + + drv->driver.name = drv->name; + drv->driver.bus = &pnp_bus_type; + drv->driver.probe = pnp_device_probe; + drv->driver.remove = pnp_device_remove; + + count = driver_register(&drv->driver); + + /* get the number of initial matches */ + if (count >= 0){ + count = 0; + list_for_each(pos,&drv->driver.devices){ + count++; + } + } + return count; +} + +void pnp_unregister_driver(struct pnp_driver *drv) +{ + driver_unregister(&drv->driver); + pnp_dbg("the driver '%s' has been unregistered", drv->name); +} + +/** + * pnp_add_id - adds an EISA id to the specified device + * @id: pointer to a pnp_id structure + * @dev: pointer to the desired device + * + */ + +int pnp_add_id(struct pnp_id *id, struct pnp_dev *dev) +{ + struct pnp_id *ptr; + if (!id) + return -EINVAL; + if (!dev) + return -EINVAL; + id->next = NULL; + ptr = dev->id; + while (ptr && ptr->next) + ptr = ptr->next; + if (ptr) + ptr->next = id; + else + dev->id = id; + return 0; +} + +EXPORT_SYMBOL(pnp_register_driver); +EXPORT_SYMBOL(pnp_unregister_driver); +EXPORT_SYMBOL(pnp_add_id); +EXPORT_SYMBOL(pnp_device_attach); +EXPORT_SYMBOL(pnp_device_detach); |