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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [drivers/] [char/] [lp_m68k.c] - Blame information for rev 1765

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/*
 * split in two parts for better support of different hardware
 * by Joerg Dorchain (dorchain@mpi-sb.mpg.de)
 *
 * Amiga printer device by Michael Rausch (linux@uni-koblenz.de);
 * Atari support added by Andreas Schwab (schwab@ls5.informatik.uni-dortmund.de);
 * based upon work from
 *
 * Copyright (C) 1992 by Jim Weigand and Linus Torvalds
 * Copyright (C) 1992,1993 by Michael K. Johnson
 * - Thanks much to Gunter Windau for pointing out to me where the error
 *   checking ought to be.
 * Copyright (C) 1993 by Nigel Gamble (added interrupt code)
 */
 
/* 01/17/95: Matthias Welwarsky (dg8y@rs11.hrz.th-darmstadt.de)
 * lp_write(): rewritten from scratch
 * lp_interrupt(): fixed cli()/sti()-bug
 *
 * 95/05/28: Andreas Schwab (schwab@issan.informatik.uni-dortmund.de)
 * lp_write() fixed to make it work again.
 * 95/08/18: Andreas Schwab
 * lp_write_interrupt: fix race condition
 *
 *  * CAUTION, please do check! *
 *
 *  on 68000-based machines sti() must NEVER appear in interrupt driven
 *  code. The 68k-CPU has a priority-based interrupt scheme. while an interrupt
 *  with a certain priority is executed, all requests with lower or same
 *  priority get locked out. executing the sti()-macro allows ANY interrupt
 *  to be served. this really causes BIG trouble!
 *  to protect an interrupt driven routine against being interrupted
 *  (if absolutely needed!) one should use save_flags();cli()/restore_flags()!
 *
 */
 
#include <linux/config.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/sched.h>
#include <asm/irq.h>
 
#ifdef CONFIG_AMIGA
#include <asm/amigaints.h>
#ifdef CONFIG_MULTIFACE_III_LP
#include <linux/lp_mfc.h>
#endif
#endif
#ifdef CONFIG_ATARI
#include <asm/atarihw.h>
#include <asm/atariints.h>
#endif
 
#include <linux/lp_m68k.h>
#include <linux/lp_intern.h>
#include <linux/malloc.h>
#include <linux/interrupt.h>
 
#include <asm/segment.h>
#include <asm/system.h>
 
 
/*
 *  why bother around with the pio driver when the interrupt works;
 *  so, for "security" reasons only, it's configurable here.
 *  saves some bytes, at least ...
 */
#define FORCE_POLLING    0
#define FORCE_INTERRUPT  1
#define PREFER_INTERRUPT 2
 
#define WHICH_DRIVER    FORCE_INTERRUPT
 
#define MAX_LP 3 /* the maximum number of devices */
 
struct lp_struct lp_table[MAX_LP] = {{0,},};
 
static int max_lp; /* the real number of devices */
 
/*
 * All my debugging code assumes that you debug with only one printer at
 * a time. RWWH
 */
 
#define LP_DEBUG 
#undef LP_DEBUG 
 
 
#if WHICH_DRIVER != FORCE_INTERRUPT
#ifdef LP_DEBUG
static int lp_max_count = 1;
#endif
 
static int lp_char_polled(char lpchar, int dev)
{
        unsigned long count  = 0;
 
        do {
                count ++;
                if(need_resched)
                        schedule();
        } while (lp_table[dev].lp_is_busy(dev) && count < lp_table[dev].chars);
 
        if (count == lp_table[dev].chars) {
                return 0;
                /* we timed out, and the character was /not/ printed */
        }
#ifdef LP_DEBUG
        if (count > lp_max_count) {
                printk("lp success after %d counts.\n",count);
                lp_max_count = count;
        }
#endif
        lp_table[dev].lp_out(lpchar, dev);
        return 1;
}
#endif
 
 
#ifdef LP_DEBUG
unsigned int lp_total_chars = 0;
unsigned int lp_last_call = 0;
#endif
 
 
#if WHICH_DRIVER != FORCE_POLLING
static __inline__ int lp_char_interrupt(char lpchar, int dev)
{
        if (!lp_table[dev].lp_is_busy(dev)) {
                lp_table[dev].lp_out(lpchar,dev);
                return 1;
        }
        return 0;
}
 
static int lp_error;
 
static void lp_interrupt(int irq, struct pt_regs *fp, void *dummy)
{
    unsigned long flags;
    int dev;
 
    for (dev = 0; dev < max_lp; dev++) {
        if (lp_table[dev].lp_my_interrupt(dev) != 0)
          if (lp_table[dev].do_print)
          {
                  if (lp_table[dev].copy_size)
                  {
                          save_flags(flags);
                          cli();
                          if (lp_char_interrupt(lp_table[dev].lp_buffer[lp_table[dev].bytes_written], dev)) {
                                  --lp_table[dev].copy_size;
                                  ++lp_table[dev].bytes_written;
                                  restore_flags(flags);
                          }
                          else
                          {
                                  lp_table[dev].do_print = 0;
                                  restore_flags(flags);
                                  lp_error = 1;
                                  wake_up_interruptible(&lp_table[dev].lp_wait_q);
                          }
                  }
                  else
                  {
                          lp_table[dev].do_print = 0;
                          lp_error = 0;
                          wake_up_interruptible(&lp_table[dev].lp_wait_q);
                  }
 
          }
    }
}
 
#if WHICH_DRIVER == FORCE_INTERRUPT
static int lp_write(struct inode *inode, struct file *file,
                    const char *buf, int count)
#else
static int lp_write_interrupt(struct inode *inode, struct file *file,
                              const char *buf, int count)
#endif
{
  unsigned long total_bytes_written = 0;
  unsigned int flags;
  int rc;
  int dev = MINOR(inode->i_rdev);
 
  do {
    lp_table[dev].do_print = 0;          /* disable lp_interrupt()   */
    lp_table[dev].bytes_written = 0;     /* init buffer read-pointer */
    lp_error = 0;
    lp_table[dev].copy_size = (count <= LP_BUFFER_SIZE ? count : LP_BUFFER_SIZE);
    memcpy_fromfs(lp_table[dev].lp_buffer, buf, lp_table[dev].copy_size);
    while (lp_table[dev].copy_size) {
      save_flags(flags);
      cli();                            /* no interrupts now */
      lp_table[dev].do_print = 1;       /* enable lp_interrupt() */
      if (lp_char_interrupt(lp_table[dev].lp_buffer[lp_table[dev].bytes_written], dev)) {
        ++lp_table[dev].bytes_written;
        --lp_table[dev].copy_size;
        lp_error = 0;
      } else {                          /* something went wrong   */
        lp_table[dev].do_print = 0;      /* disable lp_interrupt() */
        lp_error = 1;                   /* printer caused error   */
      }
      if (lp_error) {
 
          /* something blocked printing, so we don't want to sleep too long,
             in case we have to rekick the interrupt */
 
          current->timeout = jiffies + LP_TIMEOUT_POLLED;
      } else {
          current->timeout = jiffies + LP_TIMEOUT_INTERRUPT;
      }
 
      interruptible_sleep_on(&lp_table[dev].lp_wait_q);
      restore_flags(flags);
 
      /* we're up again and running. we first disable lp_interrupt(), then
         check what happened meanwhile */
 
      lp_table[dev].do_print = 0;
      rc = total_bytes_written + lp_table[dev].bytes_written;
 
      if (current->signal & ~current->blocked) {
        if (rc)
          return rc;
        else
          return -EINTR;
      }
      if (lp_error) {
 
        /* an error has occurred, maybe in lp_interrupt().
           figure out the type of error, exit on request or if nothing has
           been printed at all. */
 
        if (lp_table[dev].lp_has_pout(dev)) {
          printk(KERN_NOTICE "lp%d: paper-out\n",dev);
          if (!rc) rc = -ENOSPC;
        } else if (!lp_table[dev].lp_is_online(dev)) {
          printk(KERN_NOTICE "lp%d: off-line\n",dev);
          if (!rc) rc = -EIO;
        } else if (lp_table[dev].lp_is_busy(dev)) {
          printk(KERN_NOTICE "lp%d: on fire\n",dev);
          if (!rc) rc = -EIO;
        }
        if (lp_table[dev].flags & LP_ABORT)
          return rc;
      }
      /* check if our buffer was completely printed, if not, most likely
         an unsolved error blocks the printer. As we can`t do anything
         against, we start all over again. Else we set the read-pointer
         of the buffer and count the printed characters */
 
      if (!lp_table[dev].copy_size) {
        total_bytes_written += lp_table[dev].bytes_written;
        buf += lp_table[dev].bytes_written;
        count -= lp_table[dev].bytes_written;
      }
    }
  } while (count > 0);
  return total_bytes_written;
}
#endif
 
#if WHICH_DRIVER != FORCE_INTERRUPT
#if WHICH_DRIVER == FORCE_POLLING
static int lp_write(struct inode *inode, struct file *file,
                    const char *buf, int count)
#else
static int lp_write_polled(struct inode *inode, struct file *file,
                           const char *buf, int count)
#endif
{
        char *temp = buf;
        int dev = MINOR(inode->i_rdev);
 
#ifdef LP_DEBUG
        if (jiffies-lp_last_call > lp_table[dev].time) {
                lp_total_chars = 0;
                lp_max_count = 1;
        }
        lp_last_call = jiffies;
#endif
 
        temp = buf;
        while (count > 0) {
                if (lp_char_polled(get_user(temp), dev)) {
                        /* only update counting vars if character was printed */
                        count--; temp++;
#ifdef LP_DEBUG
                        lp_total_chars++;
#endif
                } else { /* if printer timed out */
                        if (lp_table[dev].lp_has_pout(dev)) {
                                printk(KERN_NOTICE "lp%d: out of paper\n",dev);
                                if (lp_table[dev].flags & LP_ABORT)
                                        return temp - buf ? temp-buf : -ENOSPC;
                                current->state = TASK_INTERRUPTIBLE;
                                current->timeout = jiffies + LP_TIMEOUT_POLLED;
                                schedule();
                        } else if (!lp_table[dev].lp_is_online(dev)) {
                                printk(KERN_NOTICE "lp%d: off-line\n",dev);
                                if (lp_table[dev].flags & LP_ABORT)
                                        return temp - buf ? temp-buf : -EIO;
                                current->state = TASK_INTERRUPTIBLE;
                                current->timeout = jiffies + LP_TIMEOUT_POLLED;
                                schedule();
                        } else
                        /* not offline or out of paper. on fire? */
                        if (lp_table[dev].lp_is_busy(dev)) {
                                printk(KERN_NOTICE "lp%d: on fire\n",dev);
                                if (lp_table[dev].flags & LP_ABORT)
                                        return temp - buf ? temp-buf : -EFAULT;
                                current->state = TASK_INTERRUPTIBLE;
                                current->timeout = jiffies + LP_TIMEOUT_POLLED;
                                schedule();
                        }
 
                        /* check for signals before going to sleep */
                        if (current->signal & ~current->blocked) {
                                if (temp != buf)
                                        return temp-buf;
                                else
                                        return -EINTR;
                        }
#ifdef LP_DEBUG
                        printk("lp sleeping at %d characters for %d jiffies\n",
                                lp_total_chars, lp_table[dev].time);
                        lp_total_chars = 0;
#endif
                        current->state = TASK_INTERRUPTIBLE;
                        current->timeout = jiffies + lp_table[dev].time;
                        schedule();
                }
        }
        return temp - buf;
}
#endif
 
static unsigned int lp_irq = 0;
 
#if WHICH_DRIVER == PREFER_INTERRUPT
static int lp_write(struct inode *inode, struct file *file,
                    const char *buf, int count)
{
        if (lp_irq)
                return lp_write_interrupt(inode, file, buf, count);
        else
                return lp_write_polled(inode, file, buf, count);
}
#endif
 
static int lp_lseek(struct inode *inode, struct file *file,
                    off_t offset, int origin)
{
        return -ESPIPE;
}
 
static int lp_open(struct inode *inode, struct file *file)
{
        int dev = MINOR(inode->i_rdev);
 
        if (dev >= max_lp)
                return -ENODEV;
        if (!(lp_table[dev].flags & LP_EXIST))
                return -ENODEV;
        if (lp_table[dev].flags & LP_BUSY)
                return -EBUSY;
 
        lp_table[dev].flags |= LP_BUSY;
 
        return 0;
}
 
static void lp_release(struct inode *inode, struct file *file)
{
        lp_table[MINOR(inode->i_rdev)].flags &= ~LP_BUSY;
}
 
 
static int lp_ioctl(struct inode *inode, struct file *file,
                    unsigned int cmd, unsigned long arg)
{
        unsigned int minor = MINOR(inode->i_rdev);
        int retval = 0;
 
#ifdef LP_DEBUG
        printk("lp%d ioctl, cmd: 0x%x, arg: 0x%x\n", minor, cmd, arg);
#endif
        if (minor >= max_lp)
                return -ENODEV;
        if (!(lp_table[minor].flags & LP_EXIST))
                return -ENODEV;
        switch (cmd) {
        case LPTIME:
                lp_table[minor].time = arg;
                break;
        case LPCHAR:
                lp_table[minor].chars = arg;
                break;
        case LPABORT:
                if (arg)
                        lp_table[minor].flags |= LP_ABORT;
                else
                        lp_table[minor].flags &= ~LP_ABORT;
                break;
        case LPWAIT:
                lp_table[minor].wait = arg;
                break;
        case LPSETIRQ:
        case LPGETIRQ:
                retval = lp_irq;
                break;
        default:
                retval = -EINVAL;
        }
        return retval;
}
 
 
static struct file_operations lp_fops = {
        lp_lseek,
        NULL,           /* lp_read */
        lp_write,
        NULL,           /* lp_readdir */
        NULL,           /* lp_select */
        lp_ioctl,
        NULL,           /* lp_mmap */
        lp_open,
        lp_release
};
 
 
int lp_init(void)
{
        extern char m68k_debug_device[];
 
        if (!strcmp( m68k_debug_device, "par" ))
                return -EBUSY;
 
        if (register_chrdev(LP_MAJOR,"lp", &lp_fops)) {
                printk("unable to get major %d for line printer\n", LP_MAJOR);
                return -EBUSY;
        }
 
#if WHICH_DRIVER == FORCE_POLLING
        lp_irq = 0;
        printk(KERN_INFO "lp_init: lp using polling driver\n");
#else
 
#ifdef CONFIG_AMIGA
        if (MACH_IS_AMIGA && AMIGAHW_PRESENT(AMI_PARALLEL))
                lp_irq = add_isr(IRQ_AMIGA_CIAA_FLG, lp_interrupt, 0,
                                 NULL, "printer");
#endif
#ifdef CONFIG_ATARI
        if (MACH_IS_ATARI)
                lp_irq = add_isr(IRQ_MFP_BUSY, lp_interrupt, IRQ_TYPE_SLOW,
                                 NULL, "printer");
#endif
 
        if (lp_irq)
                printk(KERN_INFO "lp_init: lp using interrupt\n");
        else
 
#if WHICH_DRIVER == PREFER_INTERRUPT
                printk(KERN_INFO "lp_init: lp using polling driver\n");
#else
                printk(KERN_WARNING "lp_init: can't get interrupt, and polling driver not configured\n");
#endif
#endif
 
        max_lp = 0;
        max_lp += lp_internal_init(lp_table, max_lp, MAX_LP, WHICH_DRIVER);
#ifdef CONFIG_MULTIFACE_III_LP
        max_lp += lp_mfc_init(lp_table, max_lp, MAX_LP, WHICH_DRIVER);
#if WHICH_DRIVER != FORCE_POLLING
        add_isr(IRQ_AMIGA_PORTS, lp_interrupt, 0, NULL,
                "Multiface III printer");
#endif
#endif
        return 0;
}
 
/*
 * Currently we do not accept any lp-parameters, but that may change.
 */
void    lp_setup(char *str, int *ints)
{
}

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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [drivers/] [char/] [lp_m68k.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	199	simons	`/*`
2			`* split in two parts for better support of different hardware`
3			`* by Joerg Dorchain (dorchain@mpi-sb.mpg.de)`
4			`*`
5			`* Amiga printer device by Michael Rausch (linux@uni-koblenz.de);`
6			`* Atari support added by Andreas Schwab (schwab@ls5.informatik.uni-dortmund.de);`
7			`* based upon work from`
8			`*`
9			`* Copyright (C) 1992 by Jim Weigand and Linus Torvalds`
10			`* Copyright (C) 1992,1993 by Michael K. Johnson`
11			`* - Thanks much to Gunter Windau for pointing out to me where the error`
12			`* checking ought to be.`
13			`* Copyright (C) 1993 by Nigel Gamble (added interrupt code)`
14			`*/`
15
16			`/* 01/17/95: Matthias Welwarsky (dg8y@rs11.hrz.th-darmstadt.de)`
17			`* lp_write(): rewritten from scratch`
18			`* lp_interrupt(): fixed cli()/sti()-bug`
19			`*`
20			`* 95/05/28: Andreas Schwab (schwab@issan.informatik.uni-dortmund.de)`
21			`* lp_write() fixed to make it work again.`
22			`* 95/08/18: Andreas Schwab`
23			`* lp_write_interrupt: fix race condition`
24			`*`
25			`* * CAUTION, please do check! *`
26			`*`
27			`* on 68000-based machines sti() must NEVER appear in interrupt driven`
28			`* code. The 68k-CPU has a priority-based interrupt scheme. while an interrupt`
29			`* with a certain priority is executed, all requests with lower or same`
30			`* priority get locked out. executing the sti()-macro allows ANY interrupt`
31			`* to be served. this really causes BIG trouble!`
32			`* to protect an interrupt driven routine against being interrupted`
33			`* (if absolutely needed!) one should use save_flags();cli()/restore_flags()!`
34			`*`
35			`*/`
36
37			`#include <linux/config.h>`
38			`#include <linux/errno.h>`
39			`#include <linux/kernel.h>`
40			`#include <linux/major.h>`
41			`#include <linux/sched.h>`
42			`#include <asm/irq.h>`
43
44			`#ifdef CONFIG_AMIGA`
45			`#include <asm/amigaints.h>`
46			`#ifdef CONFIG_MULTIFACE_III_LP`
47			`#include <linux/lp_mfc.h>`
48			`#endif`
49			`#endif`
50			`#ifdef CONFIG_ATARI`
51			`#include <asm/atarihw.h>`
52			`#include <asm/atariints.h>`
53			`#endif`
54
55			`#include <linux/lp_m68k.h>`
56			`#include <linux/lp_intern.h>`
57			`#include <linux/malloc.h>`
58			`#include <linux/interrupt.h>`
59
60			`#include <asm/segment.h>`
61			`#include <asm/system.h>`
62
63
64			`/*`
65			`* why bother around with the pio driver when the interrupt works;`
66			`* so, for "security" reasons only, it's configurable here.`
67			`* saves some bytes, at least ...`
68			`*/`
69			`#define FORCE_POLLING 0`
70			`#define FORCE_INTERRUPT 1`
71			`#define PREFER_INTERRUPT 2`
72
73			`#define WHICH_DRIVER FORCE_INTERRUPT`
74
75			`#define MAX_LP 3 /* the maximum number of devices */`
76
77			`struct lp_struct lp_table[MAX_LP] = {{0,},};`
78
79			`static int max_lp; /* the real number of devices */`
80
81			`/*`
82			`* All my debugging code assumes that you debug with only one printer at`
83			`* a time. RWWH`
84			`*/`
85
86			`#define LP_DEBUG`
87			`#undef LP_DEBUG`
88
89
90			`#if WHICH_DRIVER != FORCE_INTERRUPT`
91			`#ifdef LP_DEBUG`
92			`static int lp_max_count = 1;`
93			`#endif`
94
95			`static int lp_char_polled(char lpchar, int dev)`
96			`{`
97			`unsigned long count = 0;`
98
99			`do {`
100			`count ++;`
101			`if(need_resched)`
102			`schedule();`
103			`} while (lp_table[dev].lp_is_busy(dev) && count < lp_table[dev].chars);`
104
105			`if (count == lp_table[dev].chars) {`
106			`return 0;`
107			`/* we timed out, and the character was /not/ printed */`
108			`}`
109			`#ifdef LP_DEBUG`
110			`if (count > lp_max_count) {`
111			`printk("lp success after %d counts.\n",count);`
112			`lp_max_count = count;`
113			`}`
114			`#endif`
115			`lp_table[dev].lp_out(lpchar, dev);`
116			`return 1;`
117			`}`
118			`#endif`
119
120
121			`#ifdef LP_DEBUG`
122			`unsigned int lp_total_chars = 0;`
123			`unsigned int lp_last_call = 0;`
124			`#endif`
125
126
127			`#if WHICH_DRIVER != FORCE_POLLING`
128			`static __inline__ int lp_char_interrupt(char lpchar, int dev)`
129			`{`
130			`if (!lp_table[dev].lp_is_busy(dev)) {`
131			`lp_table[dev].lp_out(lpchar,dev);`
132			`return 1;`
133			`}`
134			`return 0;`
135			`}`
136
137			`static int lp_error;`
138
139			`static void lp_interrupt(int irq, struct pt_regs fp, void dummy)`
140			`{`
141			`unsigned long flags;`
142			`int dev;`
143
144			`for (dev = 0; dev < max_lp; dev++) {`
145			`if (lp_table[dev].lp_my_interrupt(dev) != 0)`
146			`if (lp_table[dev].do_print)`
147			`{`
148			`if (lp_table[dev].copy_size)`
149			`{`
150			`save_flags(flags);`
151			`cli();`
152			`if (lp_char_interrupt(lp_table[dev].lp_buffer[lp_table[dev].bytes_written], dev)) {`
153			`--lp_table[dev].copy_size;`
154			`++lp_table[dev].bytes_written;`
155			`restore_flags(flags);`
156			`}`
157			`else`
158			`{`
159			`lp_table[dev].do_print = 0;`
160			`restore_flags(flags);`
161			`lp_error = 1;`
162			`wake_up_interruptible(&lp_table[dev].lp_wait_q);`
163			`}`
164			`}`
165			`else`
166			`{`
167			`lp_table[dev].do_print = 0;`
168			`lp_error = 0;`
169			`wake_up_interruptible(&lp_table[dev].lp_wait_q);`
170			`}`
171
172			`}`
173			`}`
174			`}`
175
176			`#if WHICH_DRIVER == FORCE_INTERRUPT`
177			`static int lp_write(struct inode inode, struct file file,`
178			`const char *buf, int count)`
179			`#else`
180			`static int lp_write_interrupt(struct inode inode, struct file file,`
181			`const char *buf, int count)`
182			`#endif`
183			`{`
184			`unsigned long total_bytes_written = 0;`
185			`unsigned int flags;`
186			`int rc;`
187			`int dev = MINOR(inode->i_rdev);`
188
189			`do {`
190			`lp_table[dev].do_print = 0; /* disable lp_interrupt() */`
191			`lp_table[dev].bytes_written = 0; /* init buffer read-pointer */`
192			`lp_error = 0;`
193			`lp_table[dev].copy_size = (count <= LP_BUFFER_SIZE ? count : LP_BUFFER_SIZE);`
194			`memcpy_fromfs(lp_table[dev].lp_buffer, buf, lp_table[dev].copy_size);`
195			`while (lp_table[dev].copy_size) {`
196			`save_flags(flags);`
197			`cli(); /* no interrupts now */`
198			`lp_table[dev].do_print = 1; /* enable lp_interrupt() */`
199			`if (lp_char_interrupt(lp_table[dev].lp_buffer[lp_table[dev].bytes_written], dev)) {`
200			`++lp_table[dev].bytes_written;`
201			`--lp_table[dev].copy_size;`
202			`lp_error = 0;`
203			`} else { /* something went wrong */`
204			`lp_table[dev].do_print = 0; /* disable lp_interrupt() */`
205			`lp_error = 1; /* printer caused error */`
206			`}`
207			`if (lp_error) {`
208
209			`/* something blocked printing, so we don't want to sleep too long,`
210			`in case we have to rekick the interrupt */`
211
212			`current->timeout = jiffies + LP_TIMEOUT_POLLED;`
213			`} else {`
214			`current->timeout = jiffies + LP_TIMEOUT_INTERRUPT;`
215			`}`
216
217			`interruptible_sleep_on(&lp_table[dev].lp_wait_q);`
218			`restore_flags(flags);`
219
220			`/* we're up again and running. we first disable lp_interrupt(), then`
221			`check what happened meanwhile */`
222
223			`lp_table[dev].do_print = 0;`
224			`rc = total_bytes_written + lp_table[dev].bytes_written;`
225
226			`if (current->signal & ~current->blocked) {`
227			`if (rc)`
228			`return rc;`
229			`else`
230			`return -EINTR;`
231			`}`
232			`if (lp_error) {`
233
234			`/* an error has occurred, maybe in lp_interrupt().`
235			`figure out the type of error, exit on request or if nothing has`
236			`been printed at all. */`
237
238			`if (lp_table[dev].lp_has_pout(dev)) {`
239			`printk(KERN_NOTICE "lp%d: paper-out\n",dev);`
240			`if (!rc) rc = -ENOSPC;`
241			`} else if (!lp_table[dev].lp_is_online(dev)) {`
242			`printk(KERN_NOTICE "lp%d: off-line\n",dev);`
243			`if (!rc) rc = -EIO;`
244			`} else if (lp_table[dev].lp_is_busy(dev)) {`
245			`printk(KERN_NOTICE "lp%d: on fire\n",dev);`
246			`if (!rc) rc = -EIO;`
247			`}`
248			`if (lp_table[dev].flags & LP_ABORT)`
249			`return rc;`
250			`}`
251			`/* check if our buffer was completely printed, if not, most likely`
252			an unsolved error blocks the printer. As we can`t do anything
253			`against, we start all over again. Else we set the read-pointer`
254			`of the buffer and count the printed characters */`
255
256			`if (!lp_table[dev].copy_size) {`
257			`total_bytes_written += lp_table[dev].bytes_written;`
258			`buf += lp_table[dev].bytes_written;`
259			`count -= lp_table[dev].bytes_written;`
260			`}`
261			`}`
262			`} while (count > 0);`
263			`return total_bytes_written;`
264			`}`
265			`#endif`
266
267			`#if WHICH_DRIVER != FORCE_INTERRUPT`
268			`#if WHICH_DRIVER == FORCE_POLLING`
269			`static int lp_write(struct inode inode, struct file file,`
270			`const char *buf, int count)`
271			`#else`
272			`static int lp_write_polled(struct inode inode, struct file file,`
273			`const char *buf, int count)`
274			`#endif`
275			`{`
276			`char *temp = buf;`
277			`int dev = MINOR(inode->i_rdev);`
278
279			`#ifdef LP_DEBUG`
280			`if (jiffies-lp_last_call > lp_table[dev].time) {`
281			`lp_total_chars = 0;`
282			`lp_max_count = 1;`
283			`}`
284			`lp_last_call = jiffies;`
285			`#endif`
286
287			`temp = buf;`
288			`while (count > 0) {`
289			`if (lp_char_polled(get_user(temp), dev)) {`
290			`/* only update counting vars if character was printed */`
291			`count--; temp++;`
292			`#ifdef LP_DEBUG`
293			`lp_total_chars++;`
294			`#endif`
295			`} else { /* if printer timed out */`
296			`if (lp_table[dev].lp_has_pout(dev)) {`
297			`printk(KERN_NOTICE "lp%d: out of paper\n",dev);`
298			`if (lp_table[dev].flags & LP_ABORT)`
299			`return temp - buf ? temp-buf : -ENOSPC;`
300			`current->state = TASK_INTERRUPTIBLE;`
301			`current->timeout = jiffies + LP_TIMEOUT_POLLED;`
302			`schedule();`
303			`} else if (!lp_table[dev].lp_is_online(dev)) {`
304			`printk(KERN_NOTICE "lp%d: off-line\n",dev);`
305			`if (lp_table[dev].flags & LP_ABORT)`
306			`return temp - buf ? temp-buf : -EIO;`
307			`current->state = TASK_INTERRUPTIBLE;`
308			`current->timeout = jiffies + LP_TIMEOUT_POLLED;`
309			`schedule();`
310			`} else`
311			`/* not offline or out of paper. on fire? */`
312			`if (lp_table[dev].lp_is_busy(dev)) {`
313			`printk(KERN_NOTICE "lp%d: on fire\n",dev);`
314			`if (lp_table[dev].flags & LP_ABORT)`
315			`return temp - buf ? temp-buf : -EFAULT;`
316			`current->state = TASK_INTERRUPTIBLE;`
317			`current->timeout = jiffies + LP_TIMEOUT_POLLED;`
318			`schedule();`
319			`}`
320
321			`/* check for signals before going to sleep */`
322			`if (current->signal & ~current->blocked) {`
323			`if (temp != buf)`
324			`return temp-buf;`
325			`else`
326			`return -EINTR;`
327			`}`
328			`#ifdef LP_DEBUG`
329			`printk("lp sleeping at %d characters for %d jiffies\n",`
330			`lp_total_chars, lp_table[dev].time);`
331			`lp_total_chars = 0;`
332			`#endif`
333			`current->state = TASK_INTERRUPTIBLE;`
334			`current->timeout = jiffies + lp_table[dev].time;`
335			`schedule();`
336			`}`
337			`}`
338			`return temp - buf;`
339			`}`
340			`#endif`
341
342			`static unsigned int lp_irq = 0;`
343
344			`#if WHICH_DRIVER == PREFER_INTERRUPT`
345			`static int lp_write(struct inode inode, struct file file,`
346			`const char *buf, int count)`
347			`{`
348			`if (lp_irq)`
349			`return lp_write_interrupt(inode, file, buf, count);`
350			`else`
351			`return lp_write_polled(inode, file, buf, count);`
352			`}`
353			`#endif`
354
355			`static int lp_lseek(struct inode inode, struct file file,`
356			`off_t offset, int origin)`
357			`{`
358			`return -ESPIPE;`
359			`}`
360
361			`static int lp_open(struct inode inode, struct file file)`
362			`{`
363			`int dev = MINOR(inode->i_rdev);`
364
365			`if (dev >= max_lp)`
366			`return -ENODEV;`
367			`if (!(lp_table[dev].flags & LP_EXIST))`
368			`return -ENODEV;`
369			`if (lp_table[dev].flags & LP_BUSY)`
370			`return -EBUSY;`
371
372			`lp_table[dev].flags \|= LP_BUSY;`
373
374			`return 0;`
375			`}`
376
377			`static void lp_release(struct inode inode, struct file file)`
378			`{`
379			`lp_table[MINOR(inode->i_rdev)].flags &= ~LP_BUSY;`
380			`}`
381
382
383			`static int lp_ioctl(struct inode inode, struct file file,`
384			`unsigned int cmd, unsigned long arg)`
385			`{`
386			`unsigned int minor = MINOR(inode->i_rdev);`
387			`int retval = 0;`
388
389			`#ifdef LP_DEBUG`
390			`printk("lp%d ioctl, cmd: 0x%x, arg: 0x%x\n", minor, cmd, arg);`
391			`#endif`
392			`if (minor >= max_lp)`
393			`return -ENODEV;`
394			`if (!(lp_table[minor].flags & LP_EXIST))`
395			`return -ENODEV;`
396			`switch (cmd) {`
397			`case LPTIME:`
398			`lp_table[minor].time = arg;`
399			`break;`
400			`case LPCHAR:`
401			`lp_table[minor].chars = arg;`
402			`break;`
403			`case LPABORT:`
404			`if (arg)`
405			`lp_table[minor].flags \|= LP_ABORT;`
406			`else`
407			`lp_table[minor].flags &= ~LP_ABORT;`
408			`break;`
409			`case LPWAIT:`
410			`lp_table[minor].wait = arg;`
411			`break;`
412			`case LPSETIRQ:`
413			`case LPGETIRQ:`
414			`retval = lp_irq;`
415			`break;`
416			`default:`
417			`retval = -EINVAL;`
418			`}`
419			`return retval;`
420			`}`
421
422
423			`static struct file_operations lp_fops = {`
424			`lp_lseek,`
425			`NULL, /* lp_read */`
426			`lp_write,`
427			`NULL, /* lp_readdir */`
428			`NULL, /* lp_select */`
429			`lp_ioctl,`
430			`NULL, /* lp_mmap */`
431			`lp_open,`
432			`lp_release`
433			`};`
434
435
436			`int lp_init(void)`
437			`{`
438			`extern char m68k_debug_device[];`
439
440			`if (!strcmp( m68k_debug_device, "par" ))`
441			`return -EBUSY;`
442
443			`if (register_chrdev(LP_MAJOR,"lp", &lp_fops)) {`
444			`printk("unable to get major %d for line printer\n", LP_MAJOR);`
445			`return -EBUSY;`
446			`}`
447
448			`#if WHICH_DRIVER == FORCE_POLLING`
449			`lp_irq = 0;`
450			`printk(KERN_INFO "lp_init: lp using polling driver\n");`
451			`#else`
452
453			`#ifdef CONFIG_AMIGA`
454			`if (MACH_IS_AMIGA && AMIGAHW_PRESENT(AMI_PARALLEL))`
455			`lp_irq = add_isr(IRQ_AMIGA_CIAA_FLG, lp_interrupt, 0,`
456			`NULL, "printer");`
457			`#endif`
458			`#ifdef CONFIG_ATARI`
459			`if (MACH_IS_ATARI)`
460			`lp_irq = add_isr(IRQ_MFP_BUSY, lp_interrupt, IRQ_TYPE_SLOW,`
461			`NULL, "printer");`
462			`#endif`
463
464			`if (lp_irq)`
465			`printk(KERN_INFO "lp_init: lp using interrupt\n");`
466			`else`
467
468			`#if WHICH_DRIVER == PREFER_INTERRUPT`
469			`printk(KERN_INFO "lp_init: lp using polling driver\n");`
470			`#else`
471			`printk(KERN_WARNING "lp_init: can't get interrupt, and polling driver not configured\n");`
472			`#endif`
473			`#endif`
474
475			`max_lp = 0;`
476			`max_lp += lp_internal_init(lp_table, max_lp, MAX_LP, WHICH_DRIVER);`
477			`#ifdef CONFIG_MULTIFACE_III_LP`
478			`max_lp += lp_mfc_init(lp_table, max_lp, MAX_LP, WHICH_DRIVER);`
479			`#if WHICH_DRIVER != FORCE_POLLING`
480			`add_isr(IRQ_AMIGA_PORTS, lp_interrupt, 0, NULL,`
481			`"Multiface III printer");`
482			`#endif`
483			`#endif`
484			`return 0;`
485			`}`
486
487			`/*`
488			`* Currently we do not accept any lp-parameters, but that may change.`
489			`*/`
490			`void lp_setup(char str, int ints)`
491			`{`
492			`}`