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[linux-2.6] / drivers / sbus / char / vfc_dev.c
1 /*
2  * drivers/sbus/char/vfc_dev.c
3  *
4  * Driver for the Videopix Frame Grabber.
5  * 
6  * In order to use the VFC you need to program the video controller
7  * chip. This chip is the Phillips SAA9051.  You need to call their
8  * documentation ordering line to get the docs.
9  *
10  * There is very little documentation on the VFC itself.  There is
11  * some useful info that can be found in the manuals that come with
12  * the card.  I will hopefully write some better docs at a later date.
13  *
14  * Copyright (C) 1996 Manish Vachharajani (mvachhar@noc.rutgers.edu)
15  * */
16
17 #include <linux/module.h>
18 #include <linux/kernel.h>
19 #include <linux/string.h>
20 #include <linux/slab.h>
21 #include <linux/errno.h>
22 #include <linux/sched.h>
23 #include <linux/fs.h>
24 #include <linux/smp_lock.h>
25 #include <linux/delay.h>
26 #include <linux/spinlock.h>
27 #include <linux/mm.h>
28
29 #include <asm/openprom.h>
30 #include <asm/oplib.h>
31 #include <asm/io.h>
32 #include <asm/system.h>
33 #include <asm/sbus.h>
34 #include <asm/page.h>
35 #include <asm/pgtable.h>
36 #include <asm/uaccess.h>
37
38 #define VFC_MAJOR (60)
39
40 #if 0
41 #define VFC_IOCTL_DEBUG
42 #endif
43
44 #include "vfc.h"
45 #include <asm/vfc_ioctls.h>
46
47 static const struct file_operations vfc_fops;
48 struct vfc_dev **vfc_dev_lst;
49 static char vfcstr[]="vfc";
50 static unsigned char saa9051_init_array[VFC_SAA9051_NR] = {
51         0x00, 0x64, 0x72, 0x52,
52         0x36, 0x18, 0xff, 0x20,
53         0xfc, 0x77, 0xe3, 0x50,
54         0x3e
55 };
56
57 void vfc_lock_device(struct vfc_dev *dev)
58 {
59         down(&dev->device_lock_sem);
60 }
61
62 void vfc_unlock_device(struct vfc_dev *dev)
63 {
64         up(&dev->device_lock_sem);
65 }
66
67
68 void vfc_captstat_reset(struct vfc_dev *dev) 
69 {
70         dev->control_reg |= VFC_CONTROL_CAPTRESET;
71         sbus_writel(dev->control_reg, &dev->regs->control);
72         dev->control_reg &= ~VFC_CONTROL_CAPTRESET;
73         sbus_writel(dev->control_reg, &dev->regs->control);
74         dev->control_reg |= VFC_CONTROL_CAPTRESET;
75         sbus_writel(dev->control_reg, &dev->regs->control);
76 }
77
78 void vfc_memptr_reset(struct vfc_dev *dev) 
79 {
80         dev->control_reg |= VFC_CONTROL_MEMPTR;
81         sbus_writel(dev->control_reg, &dev->regs->control);
82         dev->control_reg &= ~VFC_CONTROL_MEMPTR;
83         sbus_writel(dev->control_reg, &dev->regs->control);
84         dev->control_reg |= VFC_CONTROL_MEMPTR; 
85         sbus_writel(dev->control_reg, &dev->regs->control);
86 }
87
88 int vfc_csr_init(struct vfc_dev *dev)
89 {
90         dev->control_reg = 0x80000000;
91         sbus_writel(dev->control_reg, &dev->regs->control);
92         udelay(200); 
93         dev->control_reg &= ~0x80000000;
94         sbus_writel(dev->control_reg, &dev->regs->control);
95         udelay(100); 
96         sbus_writel(0x0f000000, &dev->regs->i2c_magic2);
97
98         vfc_memptr_reset(dev);
99
100         dev->control_reg &= ~VFC_CONTROL_DIAGMODE;
101         dev->control_reg &= ~VFC_CONTROL_CAPTURE;
102         dev->control_reg |= 0x40000000;
103         sbus_writel(dev->control_reg, &dev->regs->control);
104
105         vfc_captstat_reset(dev);
106
107         return 0;
108 }
109
110 int vfc_saa9051_init(struct vfc_dev *dev)
111 {
112         int i;
113
114         for (i = 0; i < VFC_SAA9051_NR; i++)
115                 dev->saa9051_state_array[i] = saa9051_init_array[i];
116
117         vfc_i2c_sendbuf(dev,VFC_SAA9051_ADDR,
118                         dev->saa9051_state_array, VFC_SAA9051_NR);
119         return 0;
120 }
121
122 int init_vfc_hw(struct vfc_dev *dev) 
123 {
124         vfc_lock_device(dev);
125         vfc_csr_init(dev);
126
127         vfc_pcf8584_init(dev);
128         vfc_init_i2c_bus(dev); /* hopefully this doesn't undo the magic
129                                   sun code above*/
130         vfc_saa9051_init(dev);
131         vfc_unlock_device(dev);
132         return 0; 
133 }
134
135 int init_vfc_devstruct(struct vfc_dev *dev, int instance) 
136 {
137         dev->instance=instance;
138         init_MUTEX(&dev->device_lock_sem);
139         dev->control_reg=0;
140         dev->busy=0;
141         return 0;
142 }
143
144 int init_vfc_device(struct sbus_dev *sdev,struct vfc_dev *dev, int instance)
145 {
146         if(dev == NULL) {
147                 printk(KERN_ERR "VFC: Bogus pointer passed\n");
148                 return -ENOMEM;
149         }
150         printk("Initializing vfc%d\n",instance);
151         dev->regs = NULL;
152         dev->regs = (volatile struct vfc_regs __iomem *)
153                 sbus_ioremap(&sdev->resource[0], 0,
154                              sizeof(struct vfc_regs), vfcstr);
155         dev->which_io = sdev->reg_addrs[0].which_io;
156         dev->phys_regs = (struct vfc_regs *) sdev->reg_addrs[0].phys_addr;
157         if (dev->regs == NULL)
158                 return -EIO;
159
160         printk("vfc%d: registers mapped at phys_addr: 0x%lx\n    virt_addr: 0x%lx\n",
161                instance,(unsigned long)sdev->reg_addrs[0].phys_addr,(unsigned long)dev->regs);
162
163         if (init_vfc_devstruct(dev, instance))
164                 return -EINVAL;
165         if (init_vfc_hw(dev))
166                 return -EIO;
167         return 0;
168 }
169
170
171 struct vfc_dev *vfc_get_dev_ptr(int instance) 
172 {
173         return vfc_dev_lst[instance];
174 }
175
176 static DEFINE_SPINLOCK(vfc_dev_lock);
177
178 static int vfc_open(struct inode *inode, struct file *file) 
179 {
180         struct vfc_dev *dev;
181
182         spin_lock(&vfc_dev_lock);
183         dev = vfc_get_dev_ptr(iminor(inode));
184         if (dev == NULL) {
185                 spin_unlock(&vfc_dev_lock);
186                 return -ENODEV;
187         }
188         if (dev->busy) {
189                 spin_unlock(&vfc_dev_lock);
190                 return -EBUSY;
191         }
192
193         dev->busy = 1;
194         spin_unlock(&vfc_dev_lock);
195
196         vfc_lock_device(dev);
197         
198         vfc_csr_init(dev);
199         vfc_pcf8584_init(dev);
200         vfc_init_i2c_bus(dev);
201         vfc_saa9051_init(dev);
202         vfc_memptr_reset(dev);
203         vfc_captstat_reset(dev);
204         
205         vfc_unlock_device(dev);
206         return 0;
207 }
208
209 static int vfc_release(struct inode *inode,struct file *file) 
210 {
211         struct vfc_dev *dev;
212
213         spin_lock(&vfc_dev_lock);
214         dev = vfc_get_dev_ptr(iminor(inode));
215         if (!dev || !dev->busy) {
216                 spin_unlock(&vfc_dev_lock);
217                 return -EINVAL;
218         }
219         dev->busy = 0;
220         spin_unlock(&vfc_dev_lock);
221         return 0;
222 }
223
224 static int vfc_debug(struct vfc_dev *dev, int cmd, void __user *argp)
225 {
226         struct vfc_debug_inout inout;
227         unsigned char *buffer;
228
229         if (!capable(CAP_SYS_ADMIN))
230                 return -EPERM;
231
232         switch(cmd) {
233         case VFC_I2C_SEND:
234                 if(copy_from_user(&inout, argp, sizeof(inout)))
235                         return -EFAULT;
236
237                 buffer = kmalloc(inout.len, GFP_KERNEL);
238                 if (buffer == NULL)
239                         return -ENOMEM;
240
241                 if(copy_from_user(buffer, inout.buffer, inout.len)) {
242                         kfree(buffer);
243                         return -EFAULT;
244                 }
245                 
246
247                 vfc_lock_device(dev);
248                 inout.ret=
249                         vfc_i2c_sendbuf(dev,inout.addr & 0xff,
250                                         buffer,inout.len);
251
252                 if (copy_to_user(argp,&inout,sizeof(inout))) {
253                         kfree(buffer);
254                         return -EFAULT;
255                 }
256                 vfc_unlock_device(dev);
257
258                 break;
259         case VFC_I2C_RECV:
260                 if (copy_from_user(&inout, argp, sizeof(inout)))
261                         return -EFAULT;
262
263                 buffer = kmalloc(inout.len, GFP_KERNEL);
264                 if (buffer == NULL)
265                         return -ENOMEM;
266
267                 memset(buffer,0,inout.len);
268                 vfc_lock_device(dev);
269                 inout.ret=
270                         vfc_i2c_recvbuf(dev,inout.addr & 0xff
271                                         ,buffer,inout.len);
272                 vfc_unlock_device(dev);
273                 
274                 if (copy_to_user(inout.buffer, buffer, inout.len)) {
275                         kfree(buffer);
276                         return -EFAULT;
277                 }
278                 if (copy_to_user(argp,&inout,sizeof(inout))) {
279                         kfree(buffer);
280                         return -EFAULT;
281                 }
282                 kfree(buffer);
283                 break;
284         default:
285                 return -EINVAL;
286         };
287
288         return 0;
289 }
290
291 int vfc_capture_start(struct vfc_dev *dev) 
292 {
293         vfc_captstat_reset(dev);
294         dev->control_reg = sbus_readl(&dev->regs->control);
295         if((dev->control_reg & VFC_STATUS_CAPTURE)) {
296                 printk(KERN_ERR "vfc%d: vfc capture status not reset\n",
297                        dev->instance);
298                 return -EIO;
299         }
300
301         vfc_lock_device(dev);
302         dev->control_reg &= ~VFC_CONTROL_CAPTURE;
303         sbus_writel(dev->control_reg, &dev->regs->control);
304         dev->control_reg |= VFC_CONTROL_CAPTURE;
305         sbus_writel(dev->control_reg, &dev->regs->control);
306         dev->control_reg &= ~VFC_CONTROL_CAPTURE;
307         sbus_writel(dev->control_reg, &dev->regs->control);
308         vfc_unlock_device(dev);
309
310         return 0;
311 }
312
313 int vfc_capture_poll(struct vfc_dev *dev) 
314 {
315         int timeout = 1000;
316
317         while (!timeout--) {
318                 if (sbus_readl(&dev->regs->control) & VFC_STATUS_CAPTURE)
319                         break;
320                 vfc_i2c_delay_no_busy(dev, 100);
321         }
322         if(!timeout) {
323                 printk(KERN_WARNING "vfc%d: capture timed out\n",
324                        dev->instance);
325                 return -ETIMEDOUT;
326         }
327         return 0;
328 }
329
330
331
332 static int vfc_set_control_ioctl(struct inode *inode, struct file *file, 
333                           struct vfc_dev *dev, unsigned long arg) 
334 {
335         int setcmd, ret = 0;
336
337         if (copy_from_user(&setcmd,(void __user *)arg,sizeof(unsigned int)))
338                 return -EFAULT;
339
340         VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCSCTRL) arg=0x%x\n",
341                                 dev->instance,setcmd));
342
343         switch(setcmd) {
344         case MEMPRST:
345                 vfc_lock_device(dev);
346                 vfc_memptr_reset(dev);
347                 vfc_unlock_device(dev);
348                 ret=0;
349                 break;
350         case CAPTRCMD:
351                 vfc_capture_start(dev);
352                 vfc_capture_poll(dev);
353                 break;
354         case DIAGMODE:
355                 if(capable(CAP_SYS_ADMIN)) {
356                         vfc_lock_device(dev);
357                         dev->control_reg |= VFC_CONTROL_DIAGMODE;
358                         sbus_writel(dev->control_reg, &dev->regs->control);
359                         vfc_unlock_device(dev);
360                         ret = 0;
361                 } else {
362                         ret = -EPERM; 
363                 }
364                 break;
365         case NORMMODE:
366                 vfc_lock_device(dev);
367                 dev->control_reg &= ~VFC_CONTROL_DIAGMODE;
368                 sbus_writel(dev->control_reg, &dev->regs->control);
369                 vfc_unlock_device(dev);
370                 ret = 0;
371                 break;
372         case CAPTRSTR:
373                 vfc_capture_start(dev);
374                 ret = 0;
375                 break;
376         case CAPTRWAIT:
377                 vfc_capture_poll(dev);
378                 ret = 0;
379                 break;
380         default:
381                 ret = -EINVAL;
382                 break;
383         };
384
385         return ret;
386 }
387
388
389 int vfc_port_change_ioctl(struct inode *inode, struct file *file, 
390                           struct vfc_dev *dev, unsigned long arg) 
391 {
392         int ret = 0;
393         int cmd;
394
395         if(copy_from_user(&cmd, (void __user *)arg, sizeof(unsigned int))) {
396                 VFC_IOCTL_DEBUG_PRINTK(("vfc%d: User passed bogus pointer to "
397                                         "vfc_port_change_ioctl\n",
398                                         dev->instance));
399                 return -EFAULT;
400         }
401         
402         VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCPORTCHG) arg=0x%x\n",
403                                 dev->instance, cmd));
404
405         switch(cmd) {
406         case 1:
407         case 2:
408                 VFC_SAA9051_SA(dev,VFC_SAA9051_HSY_START) = 0x72; 
409                 VFC_SAA9051_SA(dev,VFC_SAA9051_HSY_STOP) = 0x52;
410                 VFC_SAA9051_SA(dev,VFC_SAA9051_HC_START) = 0x36;
411                 VFC_SAA9051_SA(dev,VFC_SAA9051_HC_STOP) = 0x18;
412                 VFC_SAA9051_SA(dev,VFC_SAA9051_HORIZ_PEAK) = VFC_SAA9051_BP2;
413                 VFC_SAA9051_SA(dev,VFC_SAA9051_C3) = VFC_SAA9051_CT | VFC_SAA9051_SS3;
414                 VFC_SAA9051_SA(dev,VFC_SAA9051_SECAM_DELAY) = 0x3e;
415                 break;
416         case 3:
417                 VFC_SAA9051_SA(dev,VFC_SAA9051_HSY_START) = 0x3a;
418                 VFC_SAA9051_SA(dev,VFC_SAA9051_HSY_STOP) = 0x17;
419                 VFC_SAA9051_SA(dev,VFC_SAA9051_HC_START) = 0xfa;
420                 VFC_SAA9051_SA(dev,VFC_SAA9051_HC_STOP) = 0xde;
421                 VFC_SAA9051_SA(dev,VFC_SAA9051_HORIZ_PEAK) =
422                         VFC_SAA9051_BY | VFC_SAA9051_PF | VFC_SAA9051_BP2;
423                 VFC_SAA9051_SA(dev,VFC_SAA9051_C3) = VFC_SAA9051_YC;
424                 VFC_SAA9051_SA(dev,VFC_SAA9051_SECAM_DELAY) = 0;
425                 VFC_SAA9051_SA(dev,VFC_SAA9051_C2) &=
426                         ~(VFC_SAA9051_SS0 | VFC_SAA9051_SS1);
427                 break;
428         default:
429                 ret = -EINVAL;
430                 return ret;
431                 break;
432         }
433
434         switch(cmd) {
435         case 1:
436                 VFC_SAA9051_SA(dev,VFC_SAA9051_C2) |=
437                         (VFC_SAA9051_SS0 | VFC_SAA9051_SS1);
438                 break;
439         case 2:
440                 VFC_SAA9051_SA(dev,VFC_SAA9051_C2) &=
441                         ~(VFC_SAA9051_SS0 | VFC_SAA9051_SS1);
442                 VFC_SAA9051_SA(dev,VFC_SAA9051_C2) |= VFC_SAA9051_SS0; 
443                 break;
444         case 3:
445                 break;
446         default:
447                 ret = -EINVAL;
448                 return ret;
449                 break;
450         }
451         VFC_SAA9051_SA(dev,VFC_SAA9051_C3) &= ~(VFC_SAA9051_SS2);
452         ret=vfc_update_saa9051(dev);
453         udelay(500);
454         VFC_SAA9051_SA(dev,VFC_SAA9051_C3) |= (VFC_SAA9051_SS2);
455         ret=vfc_update_saa9051(dev);
456         return ret;
457 }
458
459 int vfc_set_video_ioctl(struct inode *inode, struct file *file, 
460                         struct vfc_dev *dev, unsigned long arg) 
461 {
462         int ret = 0;
463         int cmd;
464
465         if(copy_from_user(&cmd, (void __user *)arg, sizeof(unsigned int))) {
466                 VFC_IOCTL_DEBUG_PRINTK(("vfc%d: User passed bogus pointer to "
467                                         "vfc_set_video_ioctl\n",
468                                         dev->instance));
469                 return ret;
470         }
471         
472         VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCSVID) arg=0x%x\n",
473                                 dev->instance, cmd));
474         switch(cmd) {
475         case STD_NTSC:
476                 VFC_SAA9051_SA(dev,VFC_SAA9051_C1) &= ~VFC_SAA9051_ALT;
477                 VFC_SAA9051_SA(dev,VFC_SAA9051_C1) |= VFC_SAA9051_YPN | 
478                         VFC_SAA9051_CCFR0 | VFC_SAA9051_CCFR1 | VFC_SAA9051_FS;
479                 ret = vfc_update_saa9051(dev);
480                 break;
481         case STD_PAL:
482                 VFC_SAA9051_SA(dev,VFC_SAA9051_C1) &= ~(VFC_SAA9051_YPN | 
483                                                         VFC_SAA9051_CCFR1 | 
484                                                         VFC_SAA9051_CCFR0 |
485                                                         VFC_SAA9051_FS);
486                 VFC_SAA9051_SA(dev,VFC_SAA9051_C1) |= VFC_SAA9051_ALT;
487                 ret = vfc_update_saa9051(dev);
488                 break;
489
490         case COLOR_ON:
491                 VFC_SAA9051_SA(dev,VFC_SAA9051_C1) |= VFC_SAA9051_CO;
492                 VFC_SAA9051_SA(dev,VFC_SAA9051_HORIZ_PEAK) &=
493                         ~(VFC_SAA9051_BY | VFC_SAA9051_PF);
494                 ret = vfc_update_saa9051(dev);
495                 break;
496         case MONO:
497                 VFC_SAA9051_SA(dev,VFC_SAA9051_C1) &= ~(VFC_SAA9051_CO);
498                 VFC_SAA9051_SA(dev,VFC_SAA9051_HORIZ_PEAK) |=
499                         (VFC_SAA9051_BY | VFC_SAA9051_PF);
500                 ret = vfc_update_saa9051(dev);
501                 break;
502         default:
503                 ret = -EINVAL;
504                 break;
505         };
506
507         return ret;
508 }
509
510 int vfc_get_video_ioctl(struct inode *inode, struct file *file, 
511                         struct vfc_dev *dev, unsigned long arg) 
512 {
513         int ret = 0;
514         unsigned int status = NO_LOCK;
515         unsigned char buf[1];
516
517         if(vfc_i2c_recvbuf(dev, VFC_SAA9051_ADDR, buf, 1)) {
518                 printk(KERN_ERR "vfc%d: Unable to get status\n",
519                        dev->instance);
520                 return -EIO;
521         }
522
523         if(buf[0] & VFC_SAA9051_HLOCK) {
524                 status = NO_LOCK;
525         } else if(buf[0] & VFC_SAA9051_FD) {
526                 if(buf[0] & VFC_SAA9051_CD)
527                         status = NTSC_COLOR;
528                 else
529                         status = NTSC_NOCOLOR;
530         } else {
531                 if(buf[0] & VFC_SAA9051_CD)
532                         status = PAL_COLOR;
533                 else
534                         status = PAL_NOCOLOR;
535         }
536         VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCGVID) returning status 0x%x; "
537                                 "buf[0]=%x\n", dev->instance, status, buf[0]));
538
539         if (copy_to_user((void __user *)arg,&status,sizeof(unsigned int))) {
540                 VFC_IOCTL_DEBUG_PRINTK(("vfc%d: User passed bogus pointer to "
541                                         "vfc_get_video_ioctl\n",
542                                         dev->instance));
543                 return ret;
544         }
545         return ret;
546 }
547
548 static int vfc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
549               unsigned long arg) 
550 {
551         int ret = 0;
552         unsigned int tmp;
553         struct vfc_dev *dev;
554         void __user *argp = (void __user *)arg;
555
556         dev = vfc_get_dev_ptr(iminor(inode));
557         if(dev == NULL)
558                 return -ENODEV;
559         
560         switch(cmd & 0x0000ffff) {
561         case VFCGCTRL:
562 #if 0
563                 VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCGCTRL)\n", dev->instance));
564 #endif
565                 tmp = sbus_readl(&dev->regs->control);
566                 if(copy_to_user(argp, &tmp, sizeof(unsigned int))) {
567                         ret = -EFAULT;
568                         break;
569                 }
570                 ret = 0;
571                 break;
572         case VFCSCTRL:
573                 ret = vfc_set_control_ioctl(inode, file, dev, arg);
574                 break;
575         case VFCGVID:
576                 ret = vfc_get_video_ioctl(inode, file, dev, arg);
577                 break;
578         case VFCSVID:
579                 ret = vfc_set_video_ioctl(inode, file, dev, arg);
580                 break;
581         case VFCHUE:
582                 VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCHUE)\n", dev->instance));
583                 if(copy_from_user(&tmp,argp,sizeof(unsigned int))) {
584                         VFC_IOCTL_DEBUG_PRINTK(("vfc%d: User passed bogus pointer "
585                                                 "to IOCTL(VFCHUE)", dev->instance));
586                         ret = -EFAULT;
587                 } else {
588                         VFC_SAA9051_SA(dev,VFC_SAA9051_HUE) = tmp;
589                         vfc_update_saa9051(dev);
590                         ret = 0;
591                 }
592                 break;
593         case VFCPORTCHG:
594                 ret = vfc_port_change_ioctl(inode, file, dev, arg);
595                 break;
596         case VFCRDINFO:
597                 ret = -EINVAL;
598                 VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCRDINFO)\n", dev->instance));
599                 break;
600         default:
601                 ret = vfc_debug(vfc_get_dev_ptr(iminor(inode)), cmd, argp);
602                 break;
603         };
604
605         return ret;
606 }
607
608 static int vfc_mmap(struct file *file, struct vm_area_struct *vma) 
609 {
610         unsigned int map_size, ret, map_offset;
611         struct vfc_dev *dev;
612         
613         dev = vfc_get_dev_ptr(iminor(file->f_path.dentry->d_inode));
614         if(dev == NULL)
615                 return -ENODEV;
616
617         map_size = vma->vm_end - vma->vm_start;
618         if(map_size > sizeof(struct vfc_regs)) 
619                 map_size = sizeof(struct vfc_regs);
620
621         vma->vm_flags |=
622                 (VM_MAYREAD | VM_MAYWRITE | VM_MAYSHARE);
623         map_offset = (unsigned int) (long)dev->phys_regs;
624         ret = io_remap_pfn_range(vma, vma->vm_start,
625                                   MK_IOSPACE_PFN(dev->which_io,
626                                         map_offset >> PAGE_SHIFT),
627                                   map_size, vma->vm_page_prot);
628
629         if(ret)
630                 return -EAGAIN;
631
632         return 0;
633 }
634
635
636 static const struct file_operations vfc_fops = {
637         .owner =        THIS_MODULE,
638         .llseek =       no_llseek,
639         .ioctl =        vfc_ioctl,
640         .mmap =         vfc_mmap,
641         .open =         vfc_open,
642         .release =      vfc_release,
643 };
644
645 static int vfc_probe(void)
646 {
647         struct sbus_bus *sbus;
648         struct sbus_dev *sdev = NULL;
649         int ret;
650         int instance = 0, cards = 0;
651
652         for_all_sbusdev(sdev, sbus) {
653                 if (strcmp(sdev->prom_name, "vfc") == 0) {
654                         cards++;
655                         continue;
656                 }
657         }
658
659         if (!cards)
660                 return -ENODEV;
661
662         vfc_dev_lst = kmalloc(sizeof(struct vfc_dev *) *
663                                                  (cards+1),
664                                                  GFP_KERNEL);
665         if (vfc_dev_lst == NULL)
666                 return -ENOMEM;
667         memset(vfc_dev_lst, 0, sizeof(struct vfc_dev *) * (cards + 1));
668         vfc_dev_lst[cards] = NULL;
669
670         ret = register_chrdev(VFC_MAJOR, vfcstr, &vfc_fops);
671         if(ret) {
672                 printk(KERN_ERR "Unable to get major number %d\n", VFC_MAJOR);
673                 kfree(vfc_dev_lst);
674                 return -EIO;
675         }
676         instance = 0;
677         for_all_sbusdev(sdev, sbus) {
678                 if (strcmp(sdev->prom_name, "vfc") == 0) {
679                         vfc_dev_lst[instance]=(struct vfc_dev *)
680                                 kmalloc(sizeof(struct vfc_dev), GFP_KERNEL);
681                         if (vfc_dev_lst[instance] == NULL)
682                                 return -ENOMEM;
683                         ret = init_vfc_device(sdev,
684                                               vfc_dev_lst[instance],
685                                               instance);
686                         if(ret) {
687                                 printk(KERN_ERR "Unable to initialize"
688                                        " vfc%d device\n",
689                                        instance);
690                         } else {
691                         }
692                 
693                         instance++;
694                         continue;
695                 }
696         }
697
698         return 0;
699 }
700
701 #ifdef MODULE
702 int init_module(void)
703 #else 
704 int vfc_init(void)
705 #endif
706 {
707         return vfc_probe();
708 }
709
710 #ifdef MODULE
711 static void deinit_vfc_device(struct vfc_dev *dev)
712 {
713         if(dev == NULL)
714                 return;
715         sbus_iounmap(dev->regs, sizeof(struct vfc_regs));
716         kfree(dev);
717 }
718
719 void cleanup_module(void)
720 {
721         struct vfc_dev **devp;
722
723         unregister_chrdev(VFC_MAJOR,vfcstr);
724
725         for (devp = vfc_dev_lst; *devp; devp++)
726                 deinit_vfc_device(*devp);
727
728         kfree(vfc_dev_lst);
729         return;
730 }
731 #endif
732
733 MODULE_LICENSE("GPL");
734