diff options
Diffstat (limited to 'drivers/staging/ipack/ipack.c')
| -rw-r--r-- | drivers/staging/ipack/ipack.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/drivers/staging/ipack/ipack.c b/drivers/staging/ipack/ipack.c new file mode 100644 index 000000000000..2b4fa51bf167 --- /dev/null +++ b/drivers/staging/ipack/ipack.c @@ -0,0 +1,205 @@ +/* + * 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 + * Software Foundation; version 2 of the License. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/slab.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 void ipack_device_release(struct device *dev) +{ + struct ipack_device *device = to_ipack_dev(dev); + kfree(device); +} + +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) || (!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; +} + +struct ipack_bus_device *ipack_bus_register(struct device *parent, int slots, + struct ipack_bus_ops *ops) +{ + int bus_nr; + struct ipack_bus_device *bus; + + bus = kzalloc(sizeof(struct ipack_bus_device), GFP_KERNEL); + if (!bus) + return NULL; + + bus_nr = ipack_assign_bus_number(); + if (bus_nr < 0) { + kfree(bus); + return NULL; + } + + bus->bus_nr = bus_nr; + bus->parent = parent; + bus->slots = slots; + bus->ops = ops; + return bus; +} +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); + kfree(bus); + return 0; +} +EXPORT_SYMBOL_GPL(ipack_bus_unregister); + +int ipack_driver_register(struct ipack_driver *edrv, struct module *owner, + char *name) +{ + edrv->driver.owner = owner; + edrv->driver.name = name; + 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); + +struct ipack_device *ipack_device_register(struct ipack_bus_device *bus, + int slot, int irqv) +{ + int ret; + struct ipack_device *dev; + + dev = kzalloc(sizeof(struct ipack_device), GFP_KERNEL); + if (!dev) + return NULL; + + dev->dev.bus = &ipack_bus_type; + dev->dev.release = ipack_device_release; + dev->dev.parent = bus->parent; + dev->slot = slot; + dev->bus_nr = bus->bus_nr; + dev->irq = irqv; + dev->bus = bus; + dev_set_name(&dev->dev, + "ipack-dev.%u.%u", 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); + kfree(dev); + return NULL; + } + + return dev; +} +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"); |