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Linux Kernel
3.7.1
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Linux Kernel
3.7.1
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#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.h>#include <linux/kmod.h>#include <linux/spinlock.h>#include <linux/mutex.h>#include <asm/irq.h>Go to the source code of this file.
Macros | |
| #define | PARPORT_DEFAULT_TIMESLICE (HZ/5) |
Functions | |
| int | parport_register_driver (struct parport_driver *drv) |
| void | parport_unregister_driver (struct parport_driver *drv) |
| struct parport * | parport_get_port (struct parport *port) |
| void | parport_put_port (struct parport *port) |
| struct parport * | parport_register_port (unsigned long base, int irq, int dma, struct parport_operations *ops) |
| void | parport_announce_port (struct parport *port) |
| void | parport_remove_port (struct parport *port) |
is allocated by the caller and must not be | |
deallocated until the caller calls for that device. The preemption callback function, , is called when this device driver has claimed access to the port but another device driver wants to use it. It is given 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, can be NULL. The wake-up ("kick") callback function, , 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, can be NULL. The interrupt handler, , 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 . Needless to say, 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, 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) |
| void | parport_unregister_device (struct pardevice *dev) |
| struct parport * | parport_find_number (int number) |
| struct parport * | parport_find_base (unsigned long base) |
| int | parport_claim (struct pardevice *dev) |
| int | parport_claim_or_block (struct pardevice *dev) |
| void | parport_release (struct pardevice *dev) |
| irqreturn_t | parport_irq_handler (int irq, void *dev_id) |
| EXPORT_SYMBOL (parport_claim) | |
| EXPORT_SYMBOL (parport_claim_or_block) | |
| EXPORT_SYMBOL (parport_release) | |
| EXPORT_SYMBOL (parport_register_port) | |
| EXPORT_SYMBOL (parport_announce_port) | |
| EXPORT_SYMBOL (parport_remove_port) | |
| EXPORT_SYMBOL (parport_register_driver) | |
| EXPORT_SYMBOL (parport_unregister_driver) | |
| EXPORT_SYMBOL (parport_register_device) | |
| EXPORT_SYMBOL (parport_unregister_device) | |
| EXPORT_SYMBOL (parport_get_port) | |
| EXPORT_SYMBOL (parport_put_port) | |
| EXPORT_SYMBOL (parport_find_number) | |
| EXPORT_SYMBOL (parport_find_base) | |
| EXPORT_SYMBOL (parport_irq_handler) | |
| MODULE_LICENSE ("GPL") | |
Variables | |
| unsigned long | parport_default_timeslice = PARPORT_DEFAULT_TIMESLICE |
| int | parport_default_spintime = DEFAULT_SPIN_TIME |
| EXPORT_SYMBOL | ( | parport_claim | ) |
| EXPORT_SYMBOL | ( | parport_claim_or_block | ) |
| EXPORT_SYMBOL | ( | parport_release | ) |
| EXPORT_SYMBOL | ( | parport_register_port | ) |
| EXPORT_SYMBOL | ( | parport_announce_port | ) |
| EXPORT_SYMBOL | ( | parport_remove_port | ) |
| EXPORT_SYMBOL | ( | parport_register_driver | ) |
| EXPORT_SYMBOL | ( | parport_unregister_driver | ) |
| EXPORT_SYMBOL | ( | parport_register_device | ) |
| EXPORT_SYMBOL | ( | parport_unregister_device | ) |
| EXPORT_SYMBOL | ( | parport_get_port | ) |
| EXPORT_SYMBOL | ( | parport_put_port | ) |
| EXPORT_SYMBOL | ( | parport_find_number | ) |
| EXPORT_SYMBOL | ( | parport_find_base | ) |
| EXPORT_SYMBOL | ( | parport_irq_handler | ) |
| MODULE_LICENSE | ( | "GPL" | ) |
parport_announce_port - tell device drivers about a parallel 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 as the parameter.
parport_claim - claim access to a parallel port device : 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.
parport_claim_or_block - claim access to a parallel port device : 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.
parport_find_base - find a parallel port by base address : 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().
parport_find_number - find a parallel port by 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().
| irqreturn_t parport_irq_handler | ( | int | irq, |
| void * | dev_id | ||
| ) |
parport_put_port - decrement a port's reference count : the port
This should be called once for each call to parport_get_port(), once the port is no longer needed.
| int parport_register_driver | ( | struct parport_driver * | drv | ) |
parport_register_driver - register a parallel port device driver : structure describing the driver
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.
The structure is allocated by the caller and must not be deallocated until after calling parport_unregister_driver().
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. Currently it always succeeds.
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read |
parport_register_port - register a parallel port : base I/O address : IRQ line : DMA channel : 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 , , and 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 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.
parport_remove_port - deregister a parallel 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 as the parameter.
parport_unregister_device - deregister a device on a parallel port : pointer to structure representing device
This undoes the effect of parport_register_device().
| void parport_unregister_driver | ( | struct parport_driver * | drv | ) |
parport_unregister_driver - deregister a parallel port device driver : 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.
| int parport_default_spintime = DEFAULT_SPIN_TIME |
| unsigned long parport_default_timeslice = PARPORT_DEFAULT_TIMESLICE |
1.8.2