2012-05-09 13:27:19 +00:00
|
|
|
/*
|
|
|
|
* Industry-pack bus support functions.
|
|
|
|
*
|
|
|
|
* (C) 2011 Samuel Iglesias Gonsalvez <siglesia@cern.ch>, CERN
|
|
|
|
* (C) 2012 Samuel Iglesias Gonsalvez <siglesias@igalia.com>, Igalia
|
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
|
|
* under the terms of the GNU General Public License as published by the Free
|
2012-05-11 08:17:13 +00:00
|
|
|
* Software Foundation; version 2 of the License.
|
2012-05-09 13:27:19 +00:00
|
|
|
*/
|
|
|
|
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/mutex.h>
|
|
|
|
#include "ipack.h"
|
|
|
|
|
|
|
|
#define to_ipack_dev(device) container_of(device, struct ipack_device, dev)
|
|
|
|
#define to_ipack_driver(drv) container_of(drv, struct ipack_driver, driver)
|
|
|
|
|
|
|
|
/* used when allocating bus numbers */
|
|
|
|
#define IPACK_MAXBUS 64
|
|
|
|
|
|
|
|
static DEFINE_MUTEX(ipack_mutex);
|
|
|
|
|
|
|
|
struct ipack_busmap {
|
|
|
|
unsigned long busmap[IPACK_MAXBUS / (8*sizeof(unsigned long))];
|
|
|
|
};
|
|
|
|
static struct ipack_busmap busmap;
|
|
|
|
|
|
|
|
static int ipack_bus_match(struct device *device, struct device_driver *driver)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
struct ipack_device *dev = to_ipack_dev(device);
|
|
|
|
struct ipack_driver *drv = to_ipack_driver(driver);
|
|
|
|
|
|
|
|
if (!drv->ops->match)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
ret = drv->ops->match(dev);
|
|
|
|
if (ret)
|
|
|
|
dev->driver = drv;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int ipack_bus_probe(struct device *device)
|
|
|
|
{
|
|
|
|
struct ipack_device *dev = to_ipack_dev(device);
|
|
|
|
|
|
|
|
if (!dev->driver->ops->probe)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
return dev->driver->ops->probe(dev);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int ipack_bus_remove(struct device *device)
|
|
|
|
{
|
|
|
|
struct ipack_device *dev = to_ipack_dev(device);
|
|
|
|
|
|
|
|
if (!dev->driver->ops->remove)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
dev->driver->ops->remove(dev);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct bus_type ipack_bus_type = {
|
|
|
|
.name = "ipack",
|
|
|
|
.probe = ipack_bus_probe,
|
|
|
|
.match = ipack_bus_match,
|
|
|
|
.remove = ipack_bus_remove,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int ipack_assign_bus_number(void)
|
|
|
|
{
|
|
|
|
int busnum;
|
|
|
|
|
|
|
|
mutex_lock(&ipack_mutex);
|
|
|
|
busnum = find_next_zero_bit(busmap.busmap, IPACK_MAXBUS, 1);
|
|
|
|
|
|
|
|
if (busnum >= IPACK_MAXBUS) {
|
|
|
|
pr_err("too many buses\n");
|
|
|
|
busnum = -1;
|
|
|
|
goto error_find_busnum;
|
|
|
|
}
|
|
|
|
|
|
|
|
set_bit(busnum, busmap.busmap);
|
|
|
|
|
|
|
|
error_find_busnum:
|
|
|
|
mutex_unlock(&ipack_mutex);
|
|
|
|
return busnum;
|
|
|
|
}
|
|
|
|
|
|
|
|
int ipack_bus_register(struct ipack_bus_device *bus)
|
|
|
|
{
|
|
|
|
int bus_nr;
|
|
|
|
|
|
|
|
bus_nr = ipack_assign_bus_number();
|
|
|
|
if (bus_nr < 0)
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
bus->bus_nr = bus_nr;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(ipack_bus_register);
|
|
|
|
|
|
|
|
int ipack_bus_unregister(struct ipack_bus_device *bus)
|
|
|
|
{
|
|
|
|
mutex_lock(&ipack_mutex);
|
|
|
|
clear_bit(bus->bus_nr, busmap.busmap);
|
|
|
|
mutex_unlock(&ipack_mutex);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(ipack_bus_unregister);
|
|
|
|
|
|
|
|
int ipack_driver_register(struct ipack_driver *edrv)
|
|
|
|
{
|
|
|
|
edrv->driver.bus = &ipack_bus_type;
|
|
|
|
return driver_register(&edrv->driver);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(ipack_driver_register);
|
|
|
|
|
|
|
|
void ipack_driver_unregister(struct ipack_driver *edrv)
|
|
|
|
{
|
|
|
|
driver_unregister(&edrv->driver);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(ipack_driver_unregister);
|
|
|
|
|
|
|
|
static void ipack_device_release(struct device *dev)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
int ipack_device_register(struct ipack_device *dev)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
dev->dev.bus = &ipack_bus_type;
|
|
|
|
dev->dev.release = ipack_device_release;
|
|
|
|
dev_set_name(&dev->dev,
|
|
|
|
"%s.%u.%u", dev->board_name, dev->bus_nr, dev->slot);
|
|
|
|
|
|
|
|
ret = device_register(&dev->dev);
|
|
|
|
if (ret < 0) {
|
|
|
|
pr_err("error registering the device.\n");
|
|
|
|
dev->driver->ops->remove(dev);
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(ipack_device_register);
|
|
|
|
|
|
|
|
void ipack_device_unregister(struct ipack_device *dev)
|
|
|
|
{
|
|
|
|
device_unregister(&dev->dev);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(ipack_device_unregister);
|
|
|
|
|
|
|
|
static int __init ipack_init(void)
|
|
|
|
{
|
|
|
|
return bus_register(&ipack_bus_type);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit ipack_exit(void)
|
|
|
|
{
|
|
|
|
bus_unregister(&ipack_bus_type);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(ipack_init);
|
|
|
|
module_exit(ipack_exit);
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Samuel Iglesias Gonsalvez <siglesias@igalia.com>");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_DESCRIPTION("Industry-pack bus core");
|