parport: remove unused parport_register_device()

}

EXPORT_SYMBOL(parport_remove_port);

/**

 *	parport_register_device - register a device on a parallel port

 *	@port: port to which the device is attached

 *	@name: a name to refer to the device

 *	@pf: preemption callback

 *	@kf: kick callback (wake-up)

 *	@irq_func: interrupt handler

 *	@flags: registration flags

 *	@handle: data for callback functions

 *

 *	This function, called by parallel port device drivers,

 *	declares that a device is connected to a port, and tells the

 *	system all it needs to know.

 *

 *	The @name is allocated by the caller and must not be

 *	deallocated until the caller calls @parport_unregister_device

 *	for that device.

 *

 *	The preemption callback function, @pf, is called when this

 *	device driver has claimed access to the port but another

 *	device driver wants to use it.  It is given @handle as its

 *	parameter, and should return zero if it is willing for the

 *	system to release the port to another driver on its behalf.

 *	If it wants to keep control of the port it should return

 *	non-zero, and no action will be taken.  It is good manners for

 *	the driver to try to release the port at the earliest

 *	opportunity after its preemption callback rejects a preemption

 *	attempt.  Note that if a preemption callback is happy for

 *	preemption to go ahead, there is no need to release the port;

 *	it is done automatically.  This function may not block, as it

 *	may be called from interrupt context.  If the device driver

 *	does not support preemption, @pf can be %NULL.

 *

 *	The wake-up ("kick") callback function, @kf, is called when

 *	the port is available to be claimed for exclusive access; that

 *	is, parport_claim() is guaranteed to succeed when called from

 *	inside the wake-up callback function.  If the driver wants to

 *	claim the port it should do so; otherwise, it need not take

 *	any action.  This function may not block, as it may be called

 *	from interrupt context.  If the device driver does not want to

 *	be explicitly invited to claim the port in this way, @kf can

 *	be %NULL.

 *

 *	The interrupt handler, @irq_func, is called when an interrupt

 *	arrives from the parallel port.  Note that if a device driver

 *	wants to use interrupts it should use parport_enable_irq(),

 *	and can also check the irq member of the parport structure

 *	representing the port.

 *

 *	The parallel port (lowlevel) driver is the one that has called

 *	request_irq() and whose interrupt handler is called first.

 *	This handler does whatever needs to be done to the hardware to

 *	acknowledge the interrupt (for PC-style ports there is nothing

 *	special to be done).  It then tells the IEEE 1284 code about

 *	the interrupt, which may involve reacting to an IEEE 1284

 *	event depending on the current IEEE 1284 phase.  After this,

 *	it calls @irq_func.  Needless to say, @irq_func will be called

 *	from interrupt context, and may not block.

 *

 *	The %PARPORT_DEV_EXCL flag is for preventing port sharing, and

 *	so should only be used when sharing the port with other device

 *	drivers is impossible and would lead to incorrect behaviour.

 *	Use it sparingly!  Normally, @flags will be zero.

 *

 *	This function returns a pointer to a structure that represents

 *	the device on the port, or %NULL if there is not enough memory

 *	to allocate space for that structure.

 **/

struct pardevice *

parport_register_device(struct parport *port, const char *name,

			int (*pf)(void *), void (*kf)(void *),

			void (*irq_func)(void *),

			int flags, void *handle)

{

	struct pardevice *tmp;

	if (port->physport->flags & PARPORT_FLAG_EXCL) {

		/* An exclusive device is registered. */

		printk(KERN_DEBUG "%s: no more devices allowed\n", port->name);

		return NULL;

	}

	if (flags & PARPORT_DEV_LURK) {

		if (!pf || !kf) {

			pr_info("%s: refused to register lurking device (%s) without callbacks\n",

				port->name, name);

			return NULL;

		}

	}

	if (flags & PARPORT_DEV_EXCL) {

		if (port->physport->devices) {

			/*

			 * If a device is already registered and this new

			 * device wants exclusive access, then no need to

			 * continue as we can not grant exclusive access to

			 * this device.

			 */

			pr_err("%s: cannot grant exclusive access for device %s\n",

			       port->name, name);

			return NULL;

		}

	}

	/*

	 * We up our own module reference count, and that of the port

	 * on which a device is to be registered, to ensure that

	 * neither of us gets unloaded while we sleep in (e.g.)

	 * kmalloc.

	 */

	if (!try_module_get(port->ops->owner))

		return NULL;

	parport_get_port(port);

	tmp = kmalloc(sizeof(struct pardevice), GFP_KERNEL);

	if (!tmp)

		goto out;

	tmp->state = kmalloc(sizeof(struct parport_state), GFP_KERNEL);

	if (!tmp->state)

		goto out_free_pardevice;

	tmp->name = name;

	tmp->port = port;

	tmp->daisy = -1;

	tmp->preempt = pf;

	tmp->wakeup = kf;

	tmp->private = handle;

	tmp->flags = flags;

	tmp->irq_func = irq_func;

	tmp->waiting = 0;

	tmp->timeout = 5 * HZ;

	tmp->devmodel = false;

	/* Chain this onto the list */

	tmp->prev = NULL;

	/*

	 * This function must not run from an irq handler so we don' t need

	 * to clear irq on the local CPU. -arca

	 */

	spin_lock(&port->physport->pardevice_lock);

	if (flags & PARPORT_DEV_EXCL) {

		if (port->physport->devices) {

			spin_unlock(&port->physport->pardevice_lock);

			printk(KERN_DEBUG "%s: cannot grant exclusive access for device %s\n",

			       port->name, name);

			goto out_free_all;

		}

		port->flags |= PARPORT_FLAG_EXCL;

	}

	tmp->next = port->physport->devices;

	wmb(); /*

		* Make sure that tmp->next is written before it's

		* added to the list; see comments marked 'no locking

		* required'

		*/

	if (port->physport->devices)

		port->physport->devices->prev = tmp;

	port->physport->devices = tmp;

	spin_unlock(&port->physport->pardevice_lock);

	init_waitqueue_head(&tmp->wait_q);

	tmp->timeslice = parport_default_timeslice;

	tmp->waitnext = tmp->waitprev = NULL;

	/*

	 * This has to be run as last thing since init_state may need other

	 * pardevice fields. -arca

	 */

	port->ops->init_state(tmp, tmp->state);

	if (!test_and_set_bit(PARPORT_DEVPROC_REGISTERED, &port->devflags)) {

		port->proc_device = tmp;

		parport_device_proc_register(tmp);

	}

	return tmp;

 out_free_all:

	kfree(tmp->state);

 out_free_pardevice:

	kfree(tmp);

 out:

	parport_put_port(port);

	module_put(port->ops->owner);

	return NULL;

}

EXPORT_SYMBOL(parport_register_device);

static void free_pardevice(struct device *dev)

{

	struct pardevice *par_dev = to_pardevice(dev);

	unsigned int flags;

};

/* parport_register_device declares that a device is connected to a

   port, and tells the kernel all it needs to know.

   - pf is the preemption function (may be NULL for no callback)

   - kf is the wake-up function (may be NULL for no callback)

   - irq_func is the interrupt handler (may be NULL for no interrupts)

   - handle is a user pointer that gets handed to callback functions.  */

struct pardevice *parport_register_device(struct parport *port, 

			  const char *name,

			  int (*pf)(void *), void (*kf)(void *),

			  void (*irq_func)(void *), 

			  int flags, void *handle);

/*

 * parport_register_dev_model declares that a device is connected to a

 * port, and tells the kernel all it needs to know.