Logo Search packages:      
Sourcecode: linux version File versions  Download package

isa.c

/*
 * ISA bus.
 */

#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/isa.h>

static struct device isa_bus = {
      .bus_id           = "isa"
};

struct isa_dev {
      struct device dev;
      struct device *next;
      unsigned int id;
};

#define to_isa_dev(x) container_of((x), struct isa_dev, dev)

static int isa_bus_match(struct device *dev, struct device_driver *driver)
{
      struct isa_driver *isa_driver = to_isa_driver(driver);

      if (dev->platform_data == isa_driver) {
            if (!isa_driver->match ||
                  isa_driver->match(dev, to_isa_dev(dev)->id))
                  return 1;
            dev->platform_data = NULL;
      }
      return 0;
}

static int isa_bus_probe(struct device *dev)
{
      struct isa_driver *isa_driver = dev->platform_data;

      if (isa_driver->probe)
            return isa_driver->probe(dev, to_isa_dev(dev)->id);

      return 0;
}

static int isa_bus_remove(struct device *dev)
{
      struct isa_driver *isa_driver = dev->platform_data;

      if (isa_driver->remove)
            return isa_driver->remove(dev, to_isa_dev(dev)->id);

      return 0;
}

static void isa_bus_shutdown(struct device *dev)
{
      struct isa_driver *isa_driver = dev->platform_data;

      if (isa_driver->shutdown)
            isa_driver->shutdown(dev, to_isa_dev(dev)->id);
}

static int isa_bus_suspend(struct device *dev, pm_message_t state)
{
      struct isa_driver *isa_driver = dev->platform_data;

      if (isa_driver->suspend)
            return isa_driver->suspend(dev, to_isa_dev(dev)->id, state);

      return 0;
}

static int isa_bus_resume(struct device *dev)
{
      struct isa_driver *isa_driver = dev->platform_data;

      if (isa_driver->resume)
            return isa_driver->resume(dev, to_isa_dev(dev)->id);

      return 0;
}

static struct bus_type isa_bus_type = {
      .name       = "isa",
      .match            = isa_bus_match,
      .probe            = isa_bus_probe,
      .remove           = isa_bus_remove,
      .shutdown   = isa_bus_shutdown,
      .suspend    = isa_bus_suspend,
      .resume           = isa_bus_resume
};

static void isa_dev_release(struct device *dev)
{
      kfree(to_isa_dev(dev));
}

void isa_unregister_driver(struct isa_driver *isa_driver)
{
      struct device *dev = isa_driver->devices;

      while (dev) {
            struct device *tmp = to_isa_dev(dev)->next;
            device_unregister(dev);
            dev = tmp;
      }
      driver_unregister(&isa_driver->driver);
}
EXPORT_SYMBOL_GPL(isa_unregister_driver);

int isa_register_driver(struct isa_driver *isa_driver, unsigned int ndev)
{
      int error;
      unsigned int id;

      isa_driver->driver.bus  = &isa_bus_type;
      isa_driver->devices     = NULL;

      error = driver_register(&isa_driver->driver);
      if (error)
            return error;

      for (id = 0; id < ndev; id++) {
            struct isa_dev *isa_dev;

            isa_dev = kzalloc(sizeof *isa_dev, GFP_KERNEL);
            if (!isa_dev) {
                  error = -ENOMEM;
                  break;
            }

            isa_dev->dev.parent     = &isa_bus;
            isa_dev->dev.bus  = &isa_bus_type;

            snprintf(isa_dev->dev.bus_id, BUS_ID_SIZE, "%s.%u",
                        isa_driver->driver.name, id);

            isa_dev->dev.platform_data    = isa_driver;
            isa_dev->dev.release          = isa_dev_release;
            isa_dev->id             = id;

            error = device_register(&isa_dev->dev);
            if (error) {
                  put_device(&isa_dev->dev);
                  break;
            }

            if (isa_dev->dev.platform_data) {
                  isa_dev->next = isa_driver->devices;
                  isa_driver->devices = &isa_dev->dev;
            } else
                  device_unregister(&isa_dev->dev);
      }

      if (!error && !isa_driver->devices)
            error = -ENODEV;

      if (error)
            isa_unregister_driver(isa_driver);

      return error;
}
EXPORT_SYMBOL_GPL(isa_register_driver);

static int __init isa_bus_init(void)
{
      int error;

      error = bus_register(&isa_bus_type);
      if (!error) {
            error = device_register(&isa_bus);
            if (error)
                  bus_unregister(&isa_bus_type);
      }
      return error;
}

device_initcall(isa_bus_init);

Generated by  Doxygen 1.6.0   Back to index