Release 4.12 drivers/parport/share.c

/*
 * Parallel-port resource manager code.
 *
 * Authors: David Campbell <campbell@tirian.che.curtin.edu.au>
 *          Tim Waugh <tim@cyberelk.demon.co.uk>
 *          Jose Renau <renau@acm.org>
 *          Philip Blundell <philb@gnu.org>
 *          Andrea Arcangeli
 *
 * based on work by Grant Guenther <grant@torque.net>
 *          and Philip Blundell
 *
 * Any part of this program may be used in documents licensed under
 * the GNU Free Documentation License, Version 1.1 or any later version
 * published by the Free Software Foundation.
 */


#undef PARPORT_DEBUG_SHARING		
/* undef for production */

#include <linux/module.h>
#include <linux/string.h>
#include <linux/threads.h>
#include <linux/parport.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/sched/signal.h>
#include <linux/kmod.h>
#include <linux/device.h>

#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <asm/irq.h>


#undef PARPORT_PARANOID


#define PARPORT_DEFAULT_TIMESLICE	(HZ/5)


unsigned long parport_default_timeslice = PARPORT_DEFAULT_TIMESLICE;

int parport_default_spintime =  DEFAULT_SPIN_TIME;

static LIST_HEAD(portlist);
static DEFINE_SPINLOCK(parportlist_lock);

/* list of all allocated ports, sorted by ->number */
static LIST_HEAD(all_ports);
static DEFINE_SPINLOCK(full_list_lock);

static LIST_HEAD(drivers);

static DEFINE_MUTEX(registration_lock);

/* What you can do to a port that's gone away.. */


static void dead_write_lines(struct parport *p, unsigned char b){}
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static unsigned char dead_read_lines(struct parport *p) { return 0; }
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static unsigned char dead_frob_lines(struct parport *p, unsigned char b,
			     unsigned char c) { return 0; }
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static void dead_onearg(struct parport *p){}
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static void dead_initstate(struct pardevice *d, struct parport_state *s) { }
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static void dead_state(struct parport *p, struct parport_state *s) { }
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static size_t dead_write(struct parport *p, const void *b, size_t l, int f)
{ return 0; }
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static size_t dead_read(struct parport *p, void *b, size_t l, int f)
{ return 0; }
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static struct parport_operations dead_ops = {
	.write_data	= dead_write_lines,	/* data */
	.read_data	= dead_read_lines,

	.write_control	= dead_write_lines,	/* control */
	.read_control	= dead_read_lines,
	.frob_control	= dead_frob_lines,

	.read_status	= dead_read_lines,	/* status */

	.enable_irq	= dead_onearg,		/* enable_irq */
	.disable_irq	= dead_onearg,		/* disable_irq */

	.data_forward	= dead_onearg,		/* data_forward */
	.data_reverse	= dead_onearg,		/* data_reverse */

	.init_state	= dead_initstate,	/* init_state */
	.save_state	= dead_state,
	.restore_state	= dead_state,

	.epp_write_data	= dead_write,		/* epp */
	.epp_read_data	= dead_read,
	.epp_write_addr	= dead_write,
	.epp_read_addr	= dead_read,

	.ecp_write_data	= dead_write,		/* ecp */
	.ecp_read_data	= dead_read,
	.ecp_write_addr	= dead_write,

	.compat_write_data	= dead_write,	/* compat */
	.nibble_read_data	= dead_read,	/* nibble */
	.byte_read_data		= dead_read,	/* byte */

	.owner		= NULL,
};


static struct device_type parport_device_type = {
	.name = "parport",
};



static int is_parport(struct device *dev)
{
	return dev->type == &parport_device_type;
}

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static int parport_probe(struct device *dev)
{
	struct parport_driver *drv;

	if (is_parport(dev))
		return -ENODEV;

	drv = to_parport_driver(dev->driver);
	if (!drv->probe) {
		/* if driver has not defined a custom probe */
		struct pardevice *par_dev = to_pardevice(dev);

		if (strcmp(par_dev->name, drv->name))
			return -ENODEV;
		return 0;
	}
	/* if driver defined its own probe */
	return drv->probe(to_pardevice(dev));
}

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static struct bus_type parport_bus_type = {
	.name = "parport",
	.probe = parport_probe,
};



int parport_bus_init(void)
{
	return bus_register(&parport_bus_type);
}

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void parport_bus_exit(void)
{
	bus_unregister(&parport_bus_type);
}

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/*
 * iterates through all the drivers registered with the bus and sends the port
 * details to the match_port callback of the driver, so that the driver can
 * know about the new port that just registered with the bus and decide if it
 * wants to use this new port.
 */


static int driver_check(struct device_driver *dev_drv, void *_port)
{
	struct parport *port = _port;
	struct parport_driver *drv = to_parport_driver(dev_drv);

	if (drv->match_port)
		drv->match_port(port);
	return 0;
}

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/* Call attach(port) for each registered driver. */


static void attach_driver_chain(struct parport *port)
{
	/* caller has exclusive registration_lock */
	struct parport_driver *drv;

	list_for_each_entry(drv, &drivers, list)
		drv->attach(port);

	/*
         * call the driver_check function of the drivers registered in
         * new device model
         */

	bus_for_each_drv(&parport_bus_type, NULL, port, driver_check);
}

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static int driver_detach(struct device_driver *_drv, void *_port)
{
	struct parport *port = _port;
	struct parport_driver *drv = to_parport_driver(_drv);

	if (drv->detach)
		drv->detach(port);
	return 0;
}

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/* Call detach(port) for each registered driver. */


static void detach_driver_chain(struct parport *port)
{
	struct parport_driver *drv;
	/* caller has exclusive registration_lock */
	list_for_each_entry(drv, &drivers, list)
		drv->detach(port);

	/*
         * call the detach function of the drivers registered in
         * new device model
         */

	bus_for_each_drv(&parport_bus_type, NULL, port, driver_detach);
}

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/* Ask kmod for some lowlevel drivers. */


static void get_lowlevel_driver(void)
{
	/*
         * There is no actual module called this: you should set
         * up an alias for modutils.
         */
	request_module("parport_lowlevel");
}

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/*
 * iterates through all the devices connected to the bus and sends the device
 * details to the match_port callback of the driver, so that the driver can
 * know what are all the ports that are connected to the bus and choose the
 * port to which it wants to register its device.
 */


static int port_check(struct device *dev, void *dev_drv)
{
	struct parport_driver *drv = dev_drv;

	/* only send ports, do not send other devices connected to bus */
	if (is_parport(dev))
		drv->match_port(to_parport_dev(dev));
	return 0;
}

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/**
 *      parport_register_driver - register a parallel port device driver
 *      @drv: structure describing the driver
 *      @owner: owner module of drv
 *      @mod_name: module name string
 *
 *      This can be called by a parallel port device driver in order
 *      to receive notifications about ports being found in the
 *      system, as well as ports no longer available.
 *
 *      If devmodel is true then the new device model is used
 *      for registration.
 *
 *      The @drv structure is allocated by the caller and must not be
 *      deallocated until after calling parport_unregister_driver().
 *
 *      If using the non device model:
 *      The driver's attach() function may block.  The port that
 *      attach() is given will be valid for the duration of the
 *      callback, but if the driver wants to take a copy of the
 *      pointer it must call parport_get_port() to do so.  Calling
 *      parport_register_device() on that port will do this for you.
 *
 *      The driver's detach() function may block.  The port that
 *      detach() is given will be valid for the duration of the
 *      callback, but if the driver wants to take a copy of the
 *      pointer it must call parport_get_port() to do so.
 *
 *
 *      Returns 0 on success. The non device model will always succeeds.
 *      but the new device model can fail and will return the error code.
 **/



int __parport_register_driver(struct parport_driver *drv, struct module *owner,
			      const char *mod_name)
{
	if (list_empty(&portlist))
		get_lowlevel_driver();

	if (drv->devmodel) {
		/* using device model */
		int ret;

		/* initialize common driver fields */
		drv->driver.name = drv->name;
		drv->driver.bus = &parport_bus_type;
		drv->driver.owner = owner;
		drv->driver.mod_name = mod_name;
		ret = driver_register(&drv->driver);
		if (ret)
			return ret;

		mutex_lock(&registration_lock);
		if (drv->match_port)
			bus_for_each_dev(&parport_bus_type, NULL, drv,
					 port_check);
		mutex_unlock(&registration_lock);
	} else {
		struct parport *port;

		drv->devmodel = false;

		mutex_lock(&registration_lock);
		list_for_each_entry(port, &portlist, list)
			drv->attach(port);
		list_add(&drv->list, &drivers);
		mutex_unlock(&registration_lock);
	}

	return 0;
}
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EXPORT_SYMBOL(__parport_register_driver);



static int port_detach(struct device *dev, void *_drv)
{
	struct parport_driver *drv = _drv;

	if (is_parport(dev) && drv->detach)
		drv->detach(to_parport_dev(dev));

	return 0;
}

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/**
 *      parport_unregister_driver - deregister a parallel port device driver
 *      @drv: structure describing the driver that was given to
 *            parport_register_driver()
 *
 *      This should be called by a parallel port device driver that
 *      has registered itself using parport_register_driver() when it
 *      is about to be unloaded.
 *
 *      When it returns, the driver's attach() routine will no longer
 *      be called, and for each port that attach() was called for, the
 *      detach() routine will have been called.
 *
 *      All the driver's attach() and detach() calls are guaranteed to have
 *      finished by the time this function returns.
 **/



void parport_unregister_driver(struct parport_driver *drv)
{
	struct parport *port;

	mutex_lock(&registration_lock);
	if (drv->devmodel) {
		bus_for_each_dev(&parport_bus_type, NULL, drv, port_detach);
		driver_unregister(&drv->driver);
	} else {
		list_del_init(&drv->list);
		list_for_each_entry(port, &portlist, list)
			drv->detach(port);
	}
	mutex_unlock(&registration_lock);
}
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EXPORT_SYMBOL(parport_unregister_driver);



static void free_port(struct device *dev)
{
	int d;
	struct parport *port = to_parport_dev(dev);

	spin_lock(&full_list_lock);
	list_del(&port->full_list);
	spin_unlock(&full_list_lock);
	for (d = 0; d < 5; d++) {
		kfree(port->probe_info[d].class_name);
		kfree(port->probe_info[d].mfr);
		kfree(port->probe_info[d].model);
		kfree(port->probe_info[d].cmdset);
		kfree(port->probe_info[d].description);
	}

	kfree(port->name);
	kfree(port);
}

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/**
 *      parport_get_port - increment a port's reference count
 *      @port: the port
 *
 *      This ensures that a struct parport pointer remains valid
 *      until the matching parport_put_port() call.
 **/



struct parport *parport_get_port(struct parport *port)
{
	struct device *dev = get_device(&port->bus_dev);

	return to_parport_dev(dev);
}
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EXPORT_SYMBOL(parport_get_port);



void parport_del_port(struct parport *port)
{
	device_unregister(&port->bus_dev);
}
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EXPORT_SYMBOL(parport_del_port);

/**
 *      parport_put_port - decrement a port's reference count
 *      @port: the port
 *
 *      This should be called once for each call to parport_get_port(),
 *      once the port is no longer needed. When the reference count reaches
 *      zero (port is no longer used), free_port is called.
 **/



void parport_put_port(struct parport *port)
{
	put_device(&port->bus_dev);
}
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EXPORT_SYMBOL(parport_put_port);

/**
 *      parport_register_port - register a parallel port
 *      @base: base I/O address
 *      @irq: IRQ line
 *      @dma: DMA channel
 *      @ops: pointer to the port driver's port operations structure
 *
 *      When a parallel port (lowlevel) driver finds a port that
 *      should be made available to parallel port device drivers, it
 *      should call parport_register_port().  The @base, @irq, and
 *      @dma parameters are for the convenience of port drivers, and
 *      for ports where they aren't meaningful needn't be set to
 *      anything special.  They can be altered afterwards by adjusting
 *      the relevant members of the parport structure that is returned
 *      and represents the port.  They should not be tampered with
 *      after calling parport_announce_port, however.
 *
 *      If there are parallel port device drivers in the system that
 *      have registered themselves using parport_register_driver(),
 *      they are not told about the port at this time; that is done by
 *      parport_announce_port().
 *
 *      The @ops structure is allocated by the caller, and must not be
 *      deallocated before calling parport_remove_port().
 *
 *      If there is no memory to allocate a new parport structure,
 *      this function will return %NULL.
 **/



struct parport *parport_register_port(unsigned long base, int irq, int dma,
				      struct parport_operations *ops)
{
	struct list_head *l;
	struct parport *tmp;
	int num;
	int device;
	char *name;
	int ret;

	tmp = kzalloc(sizeof(struct parport), GFP_KERNEL);
	if (!tmp)
		return NULL;

	/* Init our structure */
	tmp->base = base;
	tmp->irq = irq;
	tmp->dma = dma;
	tmp->muxport = tmp->daisy = tmp->muxsel = -1;
	tmp->modes = 0;
	INIT_LIST_HEAD(&tmp->list);
	tmp->devices = tmp->cad = NULL;
	tmp->flags = 0;
	tmp->ops = ops;
	tmp->physport = tmp;
	memset(tmp->probe_info, 0, 5 * sizeof(struct parport_device_info));
	rwlock_init(&tmp->cad_lock);
	spin_lock_init(&tmp->waitlist_lock);
	spin_lock_init(&tmp->pardevice_lock);
	tmp->ieee1284.mode = IEEE1284_MODE_COMPAT;
	tmp->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
	sema_init(&tmp->ieee1284.irq, 0);
	tmp->spintime = parport_default_spintime;
	atomic_set(&tmp->ref_count, 1);
	INIT_LIST_HEAD(&tmp->full_list);

	name = kmalloc(15, GFP_KERNEL);
	if (!name) {
		kfree(tmp);
		return NULL;
	}
	/* Search for the lowest free parport number. */

	spin_lock(&full_list_lock);
	for (l = all_ports.next, num = 0; l != &all_ports; l = l->next, num++) {
		struct parport *p = list_entry(l, struct parport, full_list);
		if (p->number != num)
			break;
	}
	tmp->portnum = tmp->number = num;
	list_add_tail(&tmp->full_list, l);
	spin_unlock(&full_list_lock);

	/*
         * Now that the portnum is known finish doing the Init.
         */
	sprintf(name, "parport%d", tmp->portnum = tmp->number);
	tmp->name = name;
	tmp->bus_dev.bus = &parport_bus_type;
	tmp->bus_dev.release = free_port;
	dev_set_name(&tmp->bus_dev, name);
	tmp->bus_dev.type = &parport_device_type;

	for (device = 0; device < 5; device++)
		/* assume the worst */
		tmp->probe_info[device].class = PARPORT_CLASS_LEGACY;

	tmp->waithead = tmp->waittail = NULL;

	ret = device_register(&tmp->bus_dev);
	if (ret) {
		put_device(&tmp->bus_dev);
		return NULL;
	}

	return tmp;
}
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EXPORT_SYMBOL(parport_register_port);

/**
 *      parport_announce_port - tell device drivers about a parallel port
 *      @port: parallel port to announce
 *
 *      After a port driver has registered a parallel port with
 *      parport_register_port, and performed any necessary
 *      initialisation or adjustments, it should call
 *      parport_announce_port() in order to notify all device drivers
 *      that have called parport_register_driver().  Their attach()
 *      functions will be called, with @port as the parameter.
 **/



void parport_announce_port(struct parport *port)
{
	int i;

#ifdef CONFIG_PARPORT_1284
	/* Analyse the IEEE1284.3 topology of the port. */
	parport_daisy_init(port);
#endif

	if (!port->dev)
		printk(KERN_WARNING "%s: fix this legacy no-device port driver!\n",
		       port->name);

	parport_proc_register(port);
	mutex_lock(&registration_lock);
	spin_lock_irq(&parportlist_lock);
	list_add_tail(&port->list, &portlist);
	for (i = 1; i < 3; i++) {
		struct parport *slave = port->slaves[i-1];
		if (slave)
			list_add_tail(&slave->list, &portlist);
	}
	spin_unlock_irq(&parportlist_lock);

	/* Let drivers know that new port(s) has arrived. */
	attach_driver_chain(port);
	for (i = 1; i < 3; i++) {
		struct parport *slave = port->slaves[i-1];
		if (slave)
			attach_driver_chain(slave);
	}
	mutex_unlock(&registration_lock);
}
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EXPORT_SYMBOL(parport_announce_port);

/**
 *      parport_remove_port - deregister a parallel port
 *      @port: parallel port to deregister
 *
 *      When a parallel port driver is forcibly unloaded, or a
 *      parallel port becomes inaccessible, the port driver must call
 *      this function in order to deal with device drivers that still
 *      want to use it.
 *
 *      The parport structure associated with the port has its
 *      operations structure replaced with one containing 'null'
 *      operations that return errors or just don't do anything.
 *
 *      Any drivers that have registered themselves using
 *      parport_register_driver() are notified that the port is no
 *      longer accessible by having their detach() routines called
 *      with @port as the parameter.
 **/



void parport_remove_port(struct parport *port)
{
	int i;

	mutex_lock(&registration_lock);

	/* Spread the word. */
	detach_driver_chain(port);

#ifdef CONFIG_PARPORT_1284
	/* Forget the IEEE1284.3 topology of the port. */
	parport_daisy_fini(port);
	for (i = 1; i < 3; i++) {
		struct parport *slave = port->slaves[i-1];
		if (!slave)
			continue;
		detach_driver_chain(slave);
		parport_daisy_fini(slave);
	}
#endif

	port->ops = &dead_ops;
	spin_lock(&parportlist_lock);
	list_del_init(&port->list);
	for (i = 1; i < 3; i++) {
		struct parport *slave = port->slaves[i-1];
		if (slave)
			list_del_init(&slave->list);
	}
	spin_unlock(&parportlist_lock);

	mutex_unlock(&registration_lock);

	parport_proc_unregister(port);

	for (i = 1; i < 3; i++) {
		struct parport *slave = port->slaves[i-1];
		if (slave)
			parport_put_port(slave);
	}
}
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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) {
			printk(KERN_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;
}
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EXPORT_SYMBOL(parport_register_device);



static void free_pardevice(struct device *dev)
{
	struct pardevice *par_dev = to_pardevice(dev);

	kfree(par_dev->name);
	kfree(par_dev);
}

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struct pardevice *

parport_register_dev_model(struct parport *port, const char *name,
			   const struct pardev_cb *par_dev_cb, int id)
{
	struct pardevice *par_dev;
	int ret;
	char *devname;

	if (port->physport->flags & PARPORT_FLAG_EXCL) {
		/* An exclusive device is registered. */
		pr_err("%s: no more devices allowed\n", port->name);
		return NULL;
	}

	if (par_dev_cb->flags & PARPORT_DEV_LURK) {
		if (!par_dev_cb->preempt || !par_dev_cb->wakeup) {
			pr_info("%s: refused to register lurking device (%s) without callbacks\n",
				port->name, name);
			return NULL;
		}
	}

	if (par_dev_cb->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;
		}
	}

	if (!try_module_get(port->ops->owner))
		return NULL;

	parport_get_port(port);

	par_dev = kzalloc(sizeof(*par_dev), GFP_KERNEL);
	if (!par_dev)
		goto err_put_port;

	par_dev->state = kzalloc(sizeof(*par_dev->state), GFP_KERNEL);
	if (!par_dev->state)
		goto err_put_par_dev;

	devname = kstrdup(name, GFP_KERNEL);
	if (!devname)
		goto err_free_par_dev;

	par_dev->name = devname;
	par_dev->port = port;
	par_dev->daisy = -1;
	par_dev->preempt = par_dev_cb->preempt;
	par_dev->wakeup = par_dev_cb->wakeup;
	par_dev->private = par_dev_cb->private;
	par_dev->flags = par_dev_cb->flags;
	par_dev->irq_func = par_dev_cb->irq_func;
	par_dev->waiting = 0;
	par_dev->timeout = 5 * HZ;

	par_dev->dev.parent = &port->bus_dev;
	par_dev->dev.bus = &parport_bus_type;
	ret = dev_set_name(&par_dev->dev, "%s.%d", devname, id);
	if (ret)
		goto err_free_devname;
	par_dev->dev.release = free_pardevice;
	par_dev->devmodel = true;
	ret = device_register(&par_dev->dev);
	if (ret) {
		put_device(&par_dev->dev);
		goto err_put_port;
	}

	/* Chain this onto the list */
	par_dev->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 (par_dev_cb->flags & PARPORT_DEV_EXCL) {
		if (port->physport->devices) {
			spin_unlock(&port->physport->pardevice_lock);
			pr_debug("%s: cannot grant exclusive access for device %s\n",
				 port->name, name);
			device_unregister(&par_dev->dev);
			goto err_put_port;
		}
		port->flags |= PARPORT_FLAG_EXCL;
	}

	par_dev->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 = par_dev;
	port->physport->devices = par_dev;
	spin_unlock(&port->physport->pardevice_lock);

	init_waitqueue_head(&par_dev->wait_q);
	par_dev->timeslice = parport_default_timeslice;
	par_dev->waitnext = NULL;
	par_dev->waitprev = NULL;

	/*
         * This has to be run as last thing since init_state may need other
         * pardevice fields. -arca
         */
	port->ops->init_state(par_dev, par_dev->state);
	if (!test_and_set_bit(PARPORT_DEVPROC_REGISTERED, &port->devflags)) {
		port->proc_device = par_dev;
		parport_device_proc_register(par_dev);
	}

	return par_dev;

err_free_devname:
	kfree(devname);
err_free_par_dev:
	kfree(par_dev->state);
err_put_par_dev:
	if (!par_dev->devmodel)
		kfree(par_dev);
err_put_port:
	parport_put_port(port);
	module_put(port->ops->owner);

	return NULL;
}
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331
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12
63.16%
Sudip Mukherjee
268
43.09%
5
26.32%
Alan Cox
23
3.70%
2
10.53%
Total
622
100.00%
19
100.00%


EXPORT_SYMBOL(parport_register_dev_model);

/**
 *      parport_unregister_device - deregister a device on a parallel port
 *      @dev: pointer to structure representing device
 *
 *      This undoes the effect of parport_register_device().
 **/



void parport_unregister_device(struct pardevice *dev)
{
	struct parport *port;

#ifdef PARPORT_PARANOID
	if (!dev) {
		printk(KERN_ERR "parport_unregister_device: passed NULL\n");
		return;
	}
#endif

	port = dev->port->physport;

	if (port->proc_device == dev) {
		port->proc_device = NULL;
		clear_bit(PARPORT_DEVPROC_REGISTERED, &port->devflags);
		parport_device_proc_unregister(dev);
	}

	if (port->cad == dev) {
		printk(KERN_DEBUG "%s: %s forgot to release port\n",
		       port->name, dev->name);
		parport_release(dev);
	}

	spin_lock(&port->pardevice_lock);
	if (dev->next)
		dev->next->prev = dev->prev;
	if (dev->prev)
		dev->prev->next = dev->next;
	else
		port->devices = dev->next;

	if (dev->flags & PARPORT_DEV_EXCL)
		port->flags &= ~PARPORT_FLAG_EXCL;

	spin_unlock(&port->pardevice_lock);

	/*
         * Make sure we haven't left any pointers around in the wait
         * list.
         */
	spin_lock_irq(&port->waitlist_lock);
	if (dev->waitprev || dev->waitnext || port->waithead == dev) {
		if (dev->waitprev)
			dev->waitprev->waitnext = dev->waitnext;
		else
			port->waithead = dev->waitnext;
		if (dev->waitnext)
			dev->waitnext->waitprev = dev->waitprev;
		else
			port->waittail = dev->waitprev;
	}
	spin_unlock_irq(&port->waitlist_lock);

	kfree(dev->state);
	if (dev->devmodel)
		device_unregister(&dev->dev);
	else
		kfree(dev);

	module_put(port->ops->owner);
	parport_put_port(port);
}
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Linus Torvalds (pre-git)
164
54.67%
8
53.33%
Linus Torvalds
82
27.33%
1
6.67%
Alan Cox
35
11.67%
2
13.33%
Sudip Mukherjee
17
5.67%
3
20.00%
Alexander Gordeev
2
0.67%
1
6.67%
Total
300
100.00%
15
100.00%


EXPORT_SYMBOL(parport_unregister_device);

/**
 *      parport_find_number - find a parallel port by number
 *      @number: parallel port number
 *
 *      This returns the parallel port with the specified number, or
 *      %NULL if there is none.
 *
 *      There is an implicit parport_get_port() done already; to throw
 *      away the reference to the port that parport_find_number()
 *      gives you, use parport_put_port().
 */



struct parport *parport_find_number(int number)
{
	struct parport *port, *result = NULL;

	if (list_empty(&portlist))
		get_lowlevel_driver();

	spin_lock(&parportlist_lock);
	list_for_each_entry(port, &portlist, list) {
		if (port->number == number) {
			result = parport_get_port(port);
			break;
		}
	}
	spin_unlock(&parportlist_lock);
	return result;
}
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53
71.62%
2
50.00%
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14
18.92%
1
25.00%
Linus Torvalds
7
9.46%
1
25.00%
Total
74
100.00%
4
100.00%


EXPORT_SYMBOL(parport_find_number);

/**
 *      parport_find_base - find a parallel port by base address
 *      @base: base I/O address
 *
 *      This returns the parallel port with the specified base
 *      address, or %NULL if there is none.
 *
 *      There is an implicit parport_get_port() done already; to throw
 *      away the reference to the port that parport_find_base()
 *      gives you, use parport_put_port().
 */



struct parport *parport_find_base(unsigned long base)
{
	struct parport *port, *result = NULL;

	if (list_empty(&portlist))
		get_lowlevel_driver();

	spin_lock(&parportlist_lock);
	list_for_each_entry(port, &portlist, list) {
		if (port->base == base) {
			result = parport_get_port(port);
			break;
		}
	}
	spin_unlock(&parportlist_lock);
	return result;
}
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3
60.00%
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14
18.67%
1
20.00%
Linus Torvalds
7
9.33%
1
20.00%
Total
75
100.00%
5
100.00%


EXPORT_SYMBOL(parport_find_base);

/**
 *      parport_claim - claim access to a parallel port device
 *      @dev: pointer to structure representing a device on the port
 *
 *      This function will not block and so can be used from interrupt
 *      context.  If parport_claim() succeeds in claiming access to
 *      the port it returns zero and the port is available to use.  It
 *      may fail (returning non-zero) if the port is in use by another
 *      driver and that driver is not willing to relinquish control of
 *      the port.
 **/



int parport_claim(struct pardevice *dev)
{
	struct pardevice *oldcad;
	struct parport *port = dev->port->physport;
	unsigned long flags;

	if (port->cad == dev) {
		printk(KERN_INFO "%s: %s already owner\n",
		       dev->port->name,dev->name);
		return 0;
	}

	/* Preempt any current device */
	write_lock_irqsave(&port->cad_lock, flags);
	oldcad = port->cad;
	if (oldcad) {
		if (oldcad->preempt) {
			if (oldcad->preempt(oldcad->private))
				goto blocked;
			port->ops->save_state(port, dev->state);
		} else
			goto blocked;

		if (port->cad != oldcad) {
			/*
                         * I think we'll actually deadlock rather than
                         * get here, but just in case..
                         */
			printk(KERN_WARNING
			       "%s: %s released port when preempted!\n",
			       port->name, oldcad->name);
			if (port->cad)
				goto blocked;
		}
	}

	/* Can't fail from now on, so mark ourselves as no longer waiting.  */
	if (dev->waiting & 1) {
		dev->waiting = 0;

		/* Take ourselves out of the wait list again.  */
		spin_lock_irq(&port->waitlist_lock);
		if (dev->waitprev)
			dev->waitprev->waitnext = dev->waitnext;
		else
			port->waithead = dev->waitnext;
		if (dev->waitnext)
			dev->waitnext->waitprev = dev->waitprev;
		else
			port->waittail = dev->waitprev;
		spin_unlock_irq(&port->waitlist_lock);
		dev->waitprev = dev->waitnext = NULL;
	}

	/* Now we do the change of devices */
	port->cad = dev;

#ifdef CONFIG_PARPORT_1284
	/* If it's a mux port, select it. */
	if (dev->port->muxport >= 0) {
		/* FIXME */
		port->muxsel = dev->port->muxport;
	}

	/* If it's a daisy chain device, select it. */
	if (dev->daisy >= 0) {
		/* This could be lazier. */
		if (!parport_daisy_select(port, dev->daisy,
					   IEEE1284_MODE_COMPAT))
			port->daisy = dev->daisy;
	}
#endif /* IEEE1284.3 support */

	/* Restore control registers */
	port->ops->restore_state(port, dev->state);
	write_unlock_irqrestore(&port->cad_lock, flags);
	dev->time = jiffies;
	return 0;

blocked:
	/*
         * If this is the first time we tried to claim the port, register an
         * interest.  This is only allowed for devices sleeping in
         * parport_claim_or_block(), or those with a wakeup function.
         */

	/* The cad_lock is still held for writing here */
	if (dev->waiting & 2 || dev->wakeup) {
		spin_lock(&port->waitlist_lock);
		if (test_and_set_bit(0, &dev->waiting) == 0) {
			/* First add ourselves to the end of the wait list. */
			dev->waitnext = NULL;
			dev->waitprev = port->waittail;
			if (port->waittail) {
				port->waittail->waitnext = dev;
				port->waittail = dev;
			} else
				port->waithead = port->waittail = dev;
		}
		spin_unlock(&port->waitlist_lock);
	}
	write_unlock_irqrestore(&port->cad_lock, flags);
	return -EAGAIN;
}
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1.29%
2
20.00%
Total
465
100.00%
10
100.00%


EXPORT_SYMBOL(parport_claim);

/**
 *      parport_claim_or_block - claim access to a parallel port device
 *      @dev: pointer to structure representing a device on the port
 *
 *      This behaves like parport_claim(), but will block if necessary
 *      to wait for the port to be free.  A return value of 1
 *      indicates that it slept; 0 means that it succeeded without
 *      needing to sleep.  A negative error code indicates failure.
 **/



int parport_claim_or_block(struct pardevice *dev)
{
	int r;

	/*
         * Signal to parport_claim() that we can wait even without a
         * wakeup function.
         */
	dev->waiting = 2;

	/* Try to claim the port.  If this fails, we need to sleep.  */
	r = parport_claim(dev);
	if (r == -EAGAIN) {
#ifdef PARPORT_DEBUG_SHARING
		printk(KERN_DEBUG "%s: parport_claim() returned -EAGAIN\n", dev->name);
#endif
		/*
                 * FIXME!!! Use the proper locking for dev->waiting,
                 * and make this use the "wait_event_interruptible()"
                 * interfaces. The cli/sti that used to be here
                 * did nothing.
                 *
                 * See also parport_release()
                 */

		/*
                 * If dev->waiting is clear now, an interrupt
                 * gave us the port and we would deadlock if we slept.
                 */
		if (dev->waiting) {
			wait_event_interruptible(dev->wait_q,
						 !dev->waiting);
			if (signal_pending(current))
				return -EINTR;
			r = 1;
		} else {
			r = 0;
#ifdef PARPORT_DEBUG_SHARING
			printk(KERN_DEBUG "%s: didn't sleep in parport_claim_or_block()\n",
			       dev->name);
#endif
		}

#ifdef PARPORT_DEBUG_SHARING
		if (dev->port->physport->cad != dev)
			printk(KERN_DEBUG "%s: exiting parport_claim_or_block but %s owns port!\n",
			       dev->name, dev->port->physport->cad ?
			       dev->port->physport->cad->name:"nobody");
#endif
	}
	dev->waiting = 0;
	return r;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
146
87.43%
3
37.50%
Tim Waugh
11
6.59%
1
12.50%
Arnd Bergmann
6
3.59%
1
12.50%
Sudip Mukherjee
3
1.80%
2
25.00%
Linus Torvalds
1
0.60%
1
12.50%
Total
167
100.00%
8
100.00%


EXPORT_SYMBOL(parport_claim_or_block);

/**
 *      parport_release - give up access to a parallel port device
 *      @dev: pointer to structure representing parallel port device
 *
 *      This function cannot fail, but it should not be called without
 *      the port claimed.  Similarly, if the port is already claimed
 *      you should not try claiming it again.
 **/



void parport_release(struct pardevice *dev)
{
	struct parport *port = dev->port->physport;
	struct pardevice *pd;
	unsigned long flags;

	/* Make sure that dev is the current device */
	write_lock_irqsave(&port->cad_lock, flags);
	if (port->cad != dev) {
		write_unlock_irqrestore(&port->cad_lock, flags);
		printk(KERN_WARNING "%s: %s tried to release parport when not owner\n",
		       port->name, dev->name);
		return;
	}

#ifdef CONFIG_PARPORT_1284
	/* If this is on a mux port, deselect it. */
	if (dev->port->muxport >= 0) {
		/* FIXME */
		port->muxsel = -1;
	}

	/* If this is a daisy device, deselect it. */
	if (dev->daisy >= 0) {
		parport_daisy_deselect_all(port);
		port->daisy = -1;
	}
#endif

	port->cad = NULL;
	write_unlock_irqrestore(&port->cad_lock, flags);

	/* Save control registers */
	port->ops->save_state(port, dev->state);

	/*
         * If anybody is waiting, find out who's been there longest and
         * then wake them up. (Note: no locking required)
         */
	/* !!! LOCKING IS NEEDED HERE */
	for (pd = port->waithead; pd; pd = pd->waitnext) {
		if (pd->waiting & 2) { /* sleeping in claim_or_block */
			parport_claim(pd);
			if (waitqueue_active(&pd->wait_q))
				wake_up_interruptible(&pd->wait_q);
			return;
		} else if (pd->wakeup) {
			pd->wakeup(pd->private);
			if (dev->port->cad) /* racy but no matter */
				return;
		} else {
			printk(KERN_ERR "%s: don't know how to wake %s\n", port->name, pd->name);
		}
	}

	/*
         * Nobody was waiting, so walk the list to see if anyone is
         * interested in being woken up. (Note: no locking required)
         */
	/* !!! LOCKING IS NEEDED HERE */
	for (pd = port->devices; !port->cad && pd; pd = pd->next) {
		if (pd->wakeup && pd != dev)
			pd->wakeup(pd->private);
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
292
97.66%
8
61.54%
Sudip Mukherjee
4
1.34%
3
23.08%
Linus Torvalds
2
0.67%
1
7.69%
Tim Waugh
1
0.33%
1
7.69%
Total
299
100.00%
13
100.00%


EXPORT_SYMBOL(parport_release);



irqreturn_t parport_irq_handler(int irq, void *dev_id)
{
	struct parport *port = dev_id;

	parport_generic_irq(port);

	return IRQ_HANDLED;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jeff Garzik
27
100.00%
1
100.00%
Total
27
100.00%
1
100.00%


EXPORT_SYMBOL(parport_irq_handler);

MODULE_LICENSE("GPL");
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Sudip Mukherjee
2340
48.62%
11
17.19%
Linus Torvalds (pre-git)
1975
41.03%
29
45.31%
Al Viro
165
3.43%
6
9.38%
Alan Cox
146
3.03%
2
3.12%
Linus Torvalds
110
2.29%
6
9.38%
Jeff Garzik
32
0.66%
1
1.56%
Tim Waugh
12
0.25%
1
1.56%
Thomas Gleixner
11
0.23%
2
3.12%
David Brownell
8
0.17%
1
1.56%
Arnd Bergmann
6
0.12%
1
1.56%
Ingo Molnar
5
0.10%
2
3.12%
Alexander Gordeev
2
0.04%
1
1.56%
Geliang Tang
1
0.02%
1
1.56%
Total
4813
100.00%
64
100.00%
Directory: drivers/parport

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