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- /* $Id: parport.h,v 1.1 1998/05/17 10:57:52 andrea Exp andrea $ */
-
- #ifndef _PARPORT_H_
- #define _PARPORT_H_
-
- /* Start off with user-visible constants */
-
- /* Maximum of 8 ports per machine */
- #define PARPORT_MAX 8
-
- /* Magic numbers */
- #define PARPORT_IRQ_NONE -1
- #define PARPORT_DMA_NONE -1
- #define PARPORT_IRQ_AUTO -2
- #define PARPORT_DMA_AUTO -2
- #define PARPORT_DISABLE -2
- #define PARPORT_IRQ_PROBEONLY -3
-
- #define PARPORT_CONTROL_STROBE 0x1
- #define PARPORT_CONTROL_AUTOFD 0x2
- #define PARPORT_CONTROL_INIT 0x4
- #define PARPORT_CONTROL_SELECT 0x8
- #define PARPORT_CONTROL_INTEN 0x10
- #define PARPORT_CONTROL_DIRECTION 0x20
-
- #define PARPORT_STATUS_ERROR 0x8
- #define PARPORT_STATUS_SELECT 0x10
- #define PARPORT_STATUS_PAPEROUT 0x20
- #define PARPORT_STATUS_ACK 0x40
- #define PARPORT_STATUS_BUSY 0x80
-
- /* Type classes for Plug-and-Play probe. */
- typedef enum {
- PARPORT_CLASS_LEGACY = 0, /* Non-IEEE1284 device */
- PARPORT_CLASS_PRINTER,
- PARPORT_CLASS_MODEM,
- PARPORT_CLASS_NET,
- PARPORT_CLASS_HDC, /* Hard disk controller */
- PARPORT_CLASS_PCMCIA,
- PARPORT_CLASS_MEDIA, /* Multimedia device */
- PARPORT_CLASS_FDC, /* Floppy disk controller */
- PARPORT_CLASS_PORTS,
- PARPORT_CLASS_SCANNER,
- PARPORT_CLASS_DIGCAM,
- PARPORT_CLASS_OTHER, /* Anything else */
- PARPORT_CLASS_UNSPEC /* No CLS field in ID */
- } parport_device_class;
-
- /* The "modes" entry in parport is a bit field representing the following
- * modes.
- * Note that PARPORT_MODE_PCECPEPP is for the SMC EPP+ECP mode which is NOT
- * 100% compatible with EPP.
- */
- #define PARPORT_MODE_PCSPP 0x0001
- #define PARPORT_MODE_PCPS2 0x0002
- #define PARPORT_MODE_PCEPP 0x0004
- #define PARPORT_MODE_PCECP 0x0008
- #define PARPORT_MODE_PCECPEPP 0x0010
- #define PARPORT_MODE_PCECR 0x0020 /* ECR Register Exists */
- #define PARPORT_MODE_PCECPPS2 0x0040
-
- /* The rest is for the kernel only */
- #ifdef __KERNEL__
-
- #include <asm/system.h>
- #include <asm/ptrace.h>
- #include <asm/spinlock.h>
- #include <linux/proc_fs.h>
- #include <linux/config.h>
-
- #define PARPORT_NEED_GENERIC_OPS
-
- /* Define this later. */
- struct parport;
-
- struct pc_parport_state {
- unsigned int ctr;
- unsigned int ecr;
- };
-
- struct parport_state {
- union {
- struct pc_parport_state pc;
- /* ARC has no state. */
- /* AX uses same state information as PC */
- void *misc;
- } u;
- };
-
- struct parport_operations {
- void (*write_data)(struct parport *, unsigned char);
- unsigned char (*read_data)(struct parport *);
- void (*write_control)(struct parport *, unsigned char);
- unsigned char (*read_control)(struct parport *);
- unsigned char (*frob_control)(struct parport *, unsigned char mask, unsigned char val);
- void (*write_econtrol)(struct parport *, unsigned char);
- unsigned char (*read_econtrol)(struct parport *);
- unsigned char (*frob_econtrol)(struct parport *, unsigned char mask, unsigned char val);
- void (*write_status)(struct parport *, unsigned char);
- unsigned char (*read_status)(struct parport *);
- void (*write_fifo)(struct parport *, unsigned char);
- unsigned char (*read_fifo)(struct parport *);
-
- void (*change_mode)(struct parport *, int);
-
- void (*release_resources)(struct parport *);
- int (*claim_resources)(struct parport *);
-
- void (*epp_write_data)(struct parport *, unsigned char);
- unsigned char (*epp_read_data)(struct parport *);
- void (*epp_write_addr)(struct parport *, unsigned char);
- unsigned char (*epp_read_addr)(struct parport *);
- int (*epp_check_timeout)(struct parport *);
- size_t (*epp_write_block)(struct parport *, void *, size_t);
- size_t (*epp_read_block)(struct parport *, void *, size_t);
-
- int (*ecp_write_block)(struct parport *, void *, size_t, void (*fn)(struct parport *, void *, size_t), void *);
- int (*ecp_read_block)(struct parport *, void *, size_t, void (*fn)(struct parport *, void *, size_t), void *);
-
- void (*init_state)(struct parport_state *);
- void (*save_state)(struct parport *, struct parport_state *);
- void (*restore_state)(struct parport *, struct parport_state *);
-
- void (*enable_irq)(struct parport *);
- void (*disable_irq)(struct parport *);
- void (*interrupt)(int, void *, struct pt_regs *);
-
- void (*inc_use_count)(void);
- void (*dec_use_count)(void);
- void (*fill_inode)(struct inode *inode, int fill);
- };
-
- struct parport_device_info {
- parport_device_class class;
- const char *class_name;
- const char *mfr;
- const char *model;
- const char *cmdset;
- const char *description;
- };
-
- /* Each device can have two callback functions:
- * 1) a preemption function, called by the resource manager to request
- * that the driver relinquish control of the port. The driver should
- * return zero if it agrees to release the port, and nonzero if it
- * refuses. Do not call parport_release() - the kernel will do this
- * implicitly.
- *
- * 2) a wake-up function, called by the resource manager to tell drivers
- * that the port is available to be claimed. If a driver wants to use
- * the port, it should call parport_claim() here.
- */
-
- /* A parallel port device */
- struct pardevice {
- const char *name;
- struct parport *port;
- int (*preempt)(void *);
- void (*wakeup)(void *);
- void *private;
- void (*irq_func)(int, void *, struct pt_regs *);
- unsigned int flags;
- struct pardevice *next;
- struct pardevice *prev;
- struct parport_state *state; /* saved status over preemption */
- struct wait_queue *wait_q;
- unsigned long int time;
- unsigned long int timeslice;
- unsigned int waiting;
- struct pardevice *waitprev;
- struct pardevice *waitnext;
- };
-
- /* Directory information for the /proc interface */
- struct parport_dir {
- struct proc_dir_entry *entry; /* Directory /proc/parport/X */
- struct proc_dir_entry *irq; /* .../irq */
- struct proc_dir_entry *devices; /* .../devices */
- struct proc_dir_entry *hardware; /* .../hardware */
- struct proc_dir_entry *probe; /* .../autoprobe */
- char name[4];
- };
-
- /* A parallel port */
- struct parport {
- unsigned long base; /* base address */
- unsigned int size; /* IO extent */
- const char *name;
- int irq; /* interrupt (or -1 for none) */
- int dma;
- unsigned int modes;
-
- struct pardevice *devices;
- struct pardevice *cad; /* port owner */
-
- struct pardevice *waithead;
- struct pardevice *waittail;
-
- struct parport *next;
- unsigned int flags;
-
- struct parport_dir pdir;
- struct parport_device_info probe_info;
-
- struct parport_operations *ops;
- void *private_data; /* for lowlevel driver */
-
- int number; /* port index - the `n' in `parportn' */
- spinlock_t pardevice_lock;
- spinlock_t waitlist_lock;
- rwlock_t cad_lock;
- };
-
- /* parport_register_port registers a new parallel port at the given address (if
- * one does not already exist) and returns a pointer to it. This entails
- * claiming the I/O region, IRQ and DMA.
- * NULL is returned if initialisation fails.
- */
- struct parport *parport_register_port(unsigned long base, int irq, int dma,
- struct parport_operations *ops);
-
- /* Unregister a port. */
- extern void parport_unregister_port(struct parport *port);
-
- /* parport_in_use returns nonzero if there are devices attached to a port. */
- #define parport_in_use(x) ((x)->devices != NULL)
-
- /* Put a parallel port to sleep; release its hardware resources. Only possible
- * if no devices are registered. */
- extern void parport_quiesce(struct parport *);
-
- /* parport_enumerate returns a pointer to the linked list of all the ports
- * in this machine.
- */
- struct parport *parport_enumerate(void);
-
- /* 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)(int, void *, struct pt_regs *),
- int flags, void *handle);
-
- /* parport_unregister unlinks a device from the chain. */
- extern void parport_unregister_device(struct pardevice *dev);
-
- /* parport_claim tries to gain ownership of the port for a particular driver.
- * This may fail (return non-zero) if another driver is busy. If this
- * driver has registered an interrupt handler, it will be enabled.
- */
- extern int parport_claim(struct pardevice *dev);
-
- /* parport_claim_or_block is the same, but sleeps if the port cannot be
- claimed. Return value is 1 if it slept, 0 normally and -errno on error. */
- extern int parport_claim_or_block(struct pardevice *dev);
-
- /* parport_release reverses a previous parport_claim. This can never fail,
- * though the effects are undefined (except that they are bad) if you didn't
- * previously own the port. Once you have released the port you should make
- * sure that neither your code nor the hardware on the port tries to initiate
- * any communication without first re-claiming the port.
- * If you mess with the port state (enabling ECP for example) you should
- * clean up before releasing the port.
- */
-
- extern void parport_release(struct pardevice *dev);
-
- /* parport_yield relinquishes the port if it would be helpful to other
- * drivers. The return value is the same as for parport_claim.
- */
- extern __inline__ int parport_yield(struct pardevice *dev)
- {
- unsigned long int timeslip = (jiffies - dev->time);
- if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice))
- return 0;
- parport_release(dev);
- return parport_claim(dev);
- }
-
- /* parport_yield_blocking is the same but uses parport_claim_or_block
- * instead of parport_claim.
- */
- extern __inline__ int parport_yield_blocking(struct pardevice *dev)
- {
- unsigned long int timeslip = (jiffies - dev->time);
- if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice))
- return 0;
- parport_release(dev);
- return parport_claim_or_block(dev);
- }
-
- /*
- * Lowlevel drivers _can_ call this support function to handle irqs.
- */
- extern __inline__ void parport_generic_irq(int irq, struct parport *port,
- struct pt_regs *regs)
- {
- read_lock(&port->cad_lock);
- if (!port->cad)
- goto out_unlock;
- if (port->cad->irq_func)
- port->cad->irq_func(irq, port->cad->private, regs);
- else
- printk(KERN_ERR "%s: irq%d happened with irq_func NULL "
- "with %s as cad!\n", port->name, irq, port->cad->name);
- out_unlock:
- read_unlock(&port->cad_lock);
- }
-
- /* Flags used to identify what a device does. */
- #define PARPORT_DEV_TRAN 0 /* WARNING !! DEPRECATED !! */
- #define PARPORT_DEV_LURK (1<<0) /* WARNING !! DEPRECATED !! */
- #define PARPORT_DEV_EXCL (1<<1) /* Need exclusive access. */
-
- #define PARPORT_FLAG_COMA (1<<0)
- #define PARPORT_FLAG_EXCL (1<<1) /* EXCL driver registered. */
-
- extern void parport_parse_irqs(int, const char *[], int irqval[]);
- extern int parport_ieee1284_nibble_mode_ok(struct parport *, unsigned char);
- extern int parport_wait_peripheral(struct parport *, unsigned char, unsigned
- char);
-
- /* Prototypes from parport_procfs */
- extern int parport_proc_init(void);
- extern void parport_proc_cleanup(void);
- extern int parport_proc_register(struct parport *pp);
- extern int parport_proc_unregister(struct parport *pp);
-
- extern void dec_parport_count(void);
- extern void inc_parport_count(void);
-
- extern int parport_probe(struct parport *port, char *buffer, int len);
- extern void parport_probe_one(struct parport *port);
- extern void (*parport_probe_hook)(struct parport *port);
-
- /* If PC hardware is the only type supported, we can optimise a bit. */
- #if (defined(CONFIG_PARPORT_PC) || defined(CONFIG_PARPORT_PC_MODULE)) && !(defined(CONFIG_PARPORT_AX) || defined(CONFIG_PARPORT_AX_MODULE)) && !(defined(CONFIG_PARPORT_ARC) || defined(CONFIG_PARPORT_ARC_MODULE)) && !defined(CONFIG_PARPORT_OTHER)
- #undef PARPORT_NEED_GENERIC_OPS
- #include <linux/parport_pc.h>
- #define parport_write_data(p,x) parport_pc_write_data(p,x)
- #define parport_read_data(p) parport_pc_read_data(p)
- #define parport_write_control(p,x) parport_pc_write_control(p,x)
- #define parport_read_control(p) parport_pc_read_control(p)
- #define parport_frob_control(p,m,v) parport_pc_frob_control(p,m,v)
- #define parport_write_econtrol(p,x) parport_pc_write_econtrol(p,x)
- #define parport_read_econtrol(p) parport_pc_read_econtrol(p)
- #define parport_frob_econtrol(p,m,v) parport_pc_frob_econtrol(p,m,v)
- #define parport_write_status(p,v) parport_pc_write_status(p,v)
- #define parport_read_status(p) parport_pc_read_status(p)
- #define parport_write_fifo(p,v) parport_pc_write_fifo(p,v)
- #define parport_read_fifo(p) parport_pc_read_fifo(p)
- #define parport_change_mode(p,m) parport_pc_change_mode(p,m)
- #define parport_release_resources(p) parport_pc_release_resources(p)
- #define parport_claim_resources(p) parport_pc_claim_resources(p)
- #define parport_epp_write_data(p,x) parport_pc_write_epp(p,x)
- #define parport_epp_read_data(p) parport_pc_read_epp(p)
- #define parport_epp_write_addr(p,x) parport_pc_write_epp_addr(p,x)
- #define parport_epp_read_addr(p) parport_pc_read_epp_addr(p)
- #define parport_epp_check_timeout(p) parport_pc_check_epp_timeout(p)
- #endif
-
- #ifdef PARPORT_NEED_GENERIC_OPS
- /* Generic operations vector through the dispatch table. */
- #define parport_write_data(p,x) (p)->ops->write_data(p,x)
- #define parport_read_data(p) (p)->ops->read_data(p)
- #define parport_write_control(p,x) (p)->ops->write_control(p,x)
- #define parport_read_control(p) (p)->ops->read_control(p)
- #define parport_frob_control(p,m,v) (p)->ops->frob_control(p,m,v)
- #define parport_write_econtrol(p,x) (p)->ops->write_econtrol(p,x)
- #define parport_read_econtrol(p) (p)->ops->read_econtrol(p)
- #define parport_frob_econtrol(p,m,v) (p)->ops->frob_econtrol(p,m,v)
- #define parport_write_status(p,v) (p)->ops->write_status(p,v)
- #define parport_read_status(p) (p)->ops->read_status(p)
- #define parport_write_fifo(p,v) (p)->ops->write_fifo(p,v)
- #define parport_read_fifo(p) (p)->ops->read_fifo(p)
- #define parport_change_mode(p,m) (p)->ops->change_mode(p,m)
- #define parport_release_resources(p) (p)->ops->release_resources(p)
- #define parport_claim_resources(p) (p)->ops->claim_resources(p)
- #define parport_epp_write_data(p,x) (p)->ops->epp_write_data(p,x)
- #define parport_epp_read_data(p) (p)->ops->epp_read_data(p)
- #define parport_epp_write_addr(p,x) (p)->ops->epp_write_addr(p,x)
- #define parport_epp_read_addr(p) (p)->ops->epp_read_addr(p)
- #define parport_epp_check_timeout(p) (p)->ops->epp_check_timeout(p)
- #endif
-
- #endif /* __KERNEL__ */
- #endif /* _PARPORT_H_ */
-