3 Copyright 1996,2002,2005 Gregory D. Hager, Alfred A. Rizzi, Noah J. Cowan,
4 Jason Lapenta, Scott Smedley, Greg Sharp
6 This file is part of the DT3155 Device Driver.
8 The DT3155 Device Driver is free software; you can redistribute it
9 and/or modify it under the terms of the GNU General Public License as
10 published by the Free Software Foundation; either version 2 of the
11 License, or (at your option) any later version.
13 The DT3155 Device Driver is distributed in the hope that it will be
14 useful, but WITHOUT ANY WARRANTY; without even the implied warranty
15 of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with the DT3155 Device Driver; if not, write to the Free
20 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
25 Date Programmer Description of changes made
26 -------------------------------------------------------------------
28 10-Oct-2001 SS port to 2.4 kernel
29 02-Apr-2002 SS Mods to use allocator as a standalone module;
30 Merged John Roll's changes (john@cfa.harvard.edu)
31 to make work with multiple boards.
32 02-Jul-2002 SS Merged James Rose's chages (rosejr@purdue.edu) to:
33 * fix successive interrupt-driven captures
34 * add select/poll support.
35 10-Jul-2002 GCS Add error check when ndevices > MAXBOARDS.
36 02-Aug-2002 GCS Fix field mode so that odd (lower) field is stored
37 in lower half of buffer.
38 05-Aug-2005 SS port to 2.6 kernel.
39 26-Oct-2009 SS port to 2.6.30 kernel.
43 ** appended "mem=124" in lilo.conf to allow for 4megs free on my 128meg system.
44 * using allocator.c and allocator.h from o'reilly book (alessandro rubini)
45 ftp://ftp.systemy.it/pub/develop (see README.allocator)
47 + might want to get rid of MAXboards for allocating initial buffer.
48 confusing and not necessary
50 + in cleanup_module the MOD_IN_USE looks like it is check after it should
52 * GFP_DMA should not be set with a PCI system (pg 291)
54 - NJC why are only two buffers allowed? (see isr, approx line 358)
58 extern void printques(int);
60 #include <linux/module.h>
61 #include <linux/interrupt.h>
62 #include <linux/pci.h>
63 #include <linux/types.h>
64 #include <linux/poll.h>
65 #include <linux/sched.h>
66 #include <linux/smp_lock.h>
69 #include <asm/uaccess.h>
72 #include "dt3155_drv.h"
73 #include "dt3155_isr.h"
74 #include "dt3155_io.h"
75 #include "allocator.h"
78 MODULE_LICENSE("GPL");
80 /* Error variable. Zero means no error. */
83 #ifndef PCI_DEVICE_ID_INTEL_7116
84 #define PCI_DEVICE_ID_INTEL_7116 0x1223
87 #define DT3155_VENDORID PCI_VENDOR_ID_INTEL
88 #define DT3155_DEVICEID PCI_DEVICE_ID_INTEL_7116
92 #define DT_3155_DEBUG_MSG(x,y) printk(x,y)
94 #define DT_3155_DEBUG_MSG(x,y)
97 /* wait queue for interrupts */
98 wait_queue_head_t dt3155_read_wait_queue[MAXBOARDS];
100 /* set to dynamicaly allocate, but it is tunable: */
101 /* insmod DT_3155 dt3155 dt3155_major=XX */
102 int dt3155_major = 0;
104 /* The minor numbers are 0 and 1 ... they are not tunable.
105 * They are used as the indices for the structure vectors,
106 * and register address vectors
109 /* Global structures and variables */
111 /* Status of each device */
112 struct dt3155_status dt3155_status[MAXBOARDS];
114 /* kernel logical address of the board */
115 u8 *dt3155_lbase[MAXBOARDS] = { NULL
120 /* DT3155 registers */
121 u8 *dt3155_bbase = NULL; /* kernel logical address of the *
123 u32 dt3155_dev_open[MAXBOARDS] = {0
134 * Stops interrupt generation right away and resets the status
135 * to idle. I don't know why this works and the other way doesn't.
138 static void quick_stop (int minor)
140 // TODO: scott was here
142 ReadMReg((dt3155_lbase[minor] + INT_CSR), int_csr_r.reg);
143 /* disable interrupts */
144 int_csr_r.fld.FLD_END_EVE_EN = 0;
145 int_csr_r.fld.FLD_END_ODD_EN = 0;
146 WriteMReg((dt3155_lbase[minor] + INT_CSR), int_csr_r.reg);
148 dt3155_status[minor].state &= ~(DT3155_STATE_STOP|0xff);
149 /* mark the system stopped: */
150 dt3155_status[minor].state |= DT3155_STATE_IDLE;
151 dt3155_fbuffer[minor]->stop_acquire = 0;
152 dt3155_fbuffer[minor]->even_stopped = 0;
154 dt3155_status[minor].state |= DT3155_STATE_STOP;
155 dt3155_status[minor].fbuffer.stop_acquire = 1;
161 /*****************************************************
162 * dt3155_isr() Interrupt service routien
164 * - looks like this isr supports IRQ sharing (or could) JML
165 * - Assumes irq's are disabled, via SA_INTERRUPT flag
166 * being set in request_irq() call from init_module()
167 *****************************************************/
168 static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
175 /* find out who issued the interrupt */
176 for (index = 0; index < ndevices; index++) {
177 if(dev_id == (void*) &dt3155_status[index])
184 /* hopefully we should not get here */
185 if (minor < 0 || minor >= MAXBOARDS) {
186 printk(KERN_ERR "dt3155_isr called with invalid dev_id\n");
190 /* Check for corruption and set a flag if so */
191 ReadMReg((dt3155_lbase[minor] + CSR1), csr1_r.reg);
193 if ((csr1_r.fld.FLD_CRPT_EVE) || (csr1_r.fld.FLD_CRPT_ODD))
195 /* TODO: this should probably stop acquisition */
196 /* and set some flags so that dt3155_read */
197 /* returns an error next time it is called */
198 dt3155_errno = DT_ERR_CORRUPT;
199 printk("dt3155: corrupt field\n");
203 ReadMReg((dt3155_lbase[minor] + INT_CSR), int_csr_r.reg);
205 /* Handle the even field ... */
206 if (int_csr_r.fld.FLD_END_EVE)
208 if ((dt3155_status[minor].state & DT3155_STATE_MODE) ==
211 dt3155_fbuffer[minor]->frame_count++;
214 ReadI2C(dt3155_lbase[minor], EVEN_CSR, &i2c_even_csr.reg);
216 /* Clear the interrupt? */
217 int_csr_r.fld.FLD_END_EVE = 1;
219 /* disable the interrupt if last field */
220 if (dt3155_fbuffer[minor]->stop_acquire)
222 printk("dt3155: even stopped.\n");
223 dt3155_fbuffer[minor]->even_stopped = 1;
224 if (i2c_even_csr.fld.SNGL_EVE)
226 int_csr_r.fld.FLD_END_EVE_EN = 0;
230 i2c_even_csr.fld.SNGL_EVE = 1;
234 WriteMReg((dt3155_lbase[minor] + INT_CSR), int_csr_r.reg);
236 /* Set up next DMA if we are doing FIELDS */
237 if ((dt3155_status[minor].state & DT3155_STATE_MODE) ==
240 /* GCS (Aug 2, 2002) -- In field mode, dma the odd field
241 into the lower half of the buffer */
242 const u32 stride = dt3155_status[minor].config.cols;
243 buffer_addr = dt3155_fbuffer[minor]->
244 frame_info[dt3155_fbuffer[minor]->active_buf].addr
245 + (DT3155_MAX_ROWS / 2) * stride;
246 local_save_flags(flags);
248 wake_up_interruptible(&dt3155_read_wait_queue[minor]);
250 /* Set up the DMA address for the next field */
251 local_irq_restore(flags);
252 WriteMReg((dt3155_lbase[minor] + ODD_DMA_START), buffer_addr);
255 /* Check for errors. */
256 i2c_even_csr.fld.DONE_EVE = 1;
257 if (i2c_even_csr.fld.ERROR_EVE)
258 dt3155_errno = DT_ERR_OVERRUN;
260 WriteI2C(dt3155_lbase[minor], EVEN_CSR, i2c_even_csr.reg);
262 /* Note that we actually saw an even field meaning */
263 /* that subsequent odd field complete the frame */
264 dt3155_fbuffer[minor]->even_happened = 1;
266 /* recording the time that the even field finished, this should be */
267 /* about time in the middle of the frame */
268 do_gettimeofday(&(dt3155_fbuffer[minor]->
269 frame_info[dt3155_fbuffer[minor]->
274 /* ... now handle the odd field */
275 if (int_csr_r.fld.FLD_END_ODD)
277 ReadI2C(dt3155_lbase[minor], ODD_CSR, &i2c_odd_csr.reg);
279 /* Clear the interrupt? */
280 int_csr_r.fld.FLD_END_ODD = 1;
282 if (dt3155_fbuffer[minor]->even_happened ||
283 (dt3155_status[minor].state & DT3155_STATE_MODE) ==
286 dt3155_fbuffer[minor]->frame_count++;
289 if (dt3155_fbuffer[minor]->stop_acquire &&
290 dt3155_fbuffer[minor]->even_stopped)
292 printk(KERN_DEBUG "dt3155: stopping odd..\n");
293 if (i2c_odd_csr.fld.SNGL_ODD)
295 /* disable interrupts */
296 int_csr_r.fld.FLD_END_ODD_EN = 0;
297 dt3155_status[minor].state &= ~(DT3155_STATE_STOP|0xff);
299 /* mark the system stopped: */
300 dt3155_status[minor].state |= DT3155_STATE_IDLE;
301 dt3155_fbuffer[minor]->stop_acquire = 0;
302 dt3155_fbuffer[minor]->even_stopped = 0;
304 printk(KERN_DEBUG "dt3155: state is now %x\n",
305 dt3155_status[minor].state);
309 i2c_odd_csr.fld.SNGL_ODD = 1;
313 WriteMReg((dt3155_lbase[minor] + INT_CSR), int_csr_r.reg);
315 /* if the odd field has been acquired, then */
316 /* change the next dma location for both fields */
317 /* and wake up the process if sleeping */
318 if (dt3155_fbuffer[minor]->even_happened ||
319 (dt3155_status[minor].state & DT3155_STATE_MODE) ==
323 local_save_flags(flags);
329 if (dt3155_fbuffer[minor]->nbuffers > 2)
331 if (!are_empty_buffers(minor))
333 /* The number of active + locked buffers is
334 * at most 2, and since there are none empty, there
335 * must be at least nbuffers-2 ready buffers.
336 * This is where we 'drop frames', oldest first. */
337 push_empty(pop_ready(minor), minor);
340 /* The ready_que can't be full, since we know
341 * there is one active buffer right now, so it's safe
342 * to push the active buf on the ready_que. */
343 push_ready(minor, dt3155_fbuffer[minor]->active_buf);
344 /* There's at least 1 empty -- make it active */
345 dt3155_fbuffer[minor]->active_buf = pop_empty(minor);
346 dt3155_fbuffer[minor]->
347 frame_info[dt3155_fbuffer[minor]->
348 active_buf].tag = ++unique_tag;
350 else /* nbuffers == 2, special case */
351 { /* There is 1 active buffer.
352 * If there is a locked buffer, keep the active buffer
353 * the same -- that means we drop a frame.
355 if (dt3155_fbuffer[minor]->locked_buf < 0)
358 dt3155_fbuffer[minor]->active_buf);
359 if (are_empty_buffers(minor))
361 dt3155_fbuffer[minor]->active_buf =
365 { /* no empty or locked buffers, so use a readybuf */
366 dt3155_fbuffer[minor]->active_buf =
376 dt3155_fbuffer[minor]->even_happened = 0;
378 wake_up_interruptible(&dt3155_read_wait_queue[minor]);
380 local_irq_restore(flags);
384 /* Set up the DMA address for the next frame/field */
385 buffer_addr = dt3155_fbuffer[minor]->
386 frame_info[dt3155_fbuffer[minor]->active_buf].addr;
387 if ((dt3155_status[minor].state & DT3155_STATE_MODE) ==
390 WriteMReg((dt3155_lbase[minor] + EVEN_DMA_START), buffer_addr);
394 WriteMReg((dt3155_lbase[minor] + EVEN_DMA_START), buffer_addr);
396 WriteMReg((dt3155_lbase[minor] + ODD_DMA_START), buffer_addr
397 + dt3155_status[minor].config.cols);
400 /* Do error checking */
401 i2c_odd_csr.fld.DONE_ODD = 1;
402 if (i2c_odd_csr.fld.ERROR_ODD)
403 dt3155_errno = DT_ERR_OVERRUN;
405 WriteI2C(dt3155_lbase[minor], ODD_CSR, i2c_odd_csr.reg);
409 /* If we get here, the Odd Field wasn't it either... */
410 printk("neither even nor odd. shared perhaps?\n");
413 /*****************************************************
414 * init_isr(int minor)
415 * turns on interupt generation for the card
416 * designated by "minor".
417 * It is called *only* from inside ioctl().
418 *****************************************************/
419 static void dt3155_init_isr(int minor)
421 const u32 stride = dt3155_status[minor].config.cols;
423 switch (dt3155_status[minor].state & DT3155_STATE_MODE)
425 case DT3155_STATE_FLD:
427 even_dma_start_r = dt3155_status[minor].
428 fbuffer.frame_info[dt3155_status[minor].fbuffer.active_buf].addr;
429 even_dma_stride_r = 0;
430 odd_dma_stride_r = 0;
432 WriteMReg((dt3155_lbase[minor] + EVEN_DMA_START),
434 WriteMReg((dt3155_lbase[minor] + EVEN_DMA_STRIDE),
436 WriteMReg((dt3155_lbase[minor] + ODD_DMA_STRIDE),
441 case DT3155_STATE_FRAME:
444 even_dma_start_r = dt3155_status[minor].
445 fbuffer.frame_info[dt3155_status[minor].fbuffer.active_buf].addr;
446 odd_dma_start_r = even_dma_start_r + stride;
447 even_dma_stride_r = stride;
448 odd_dma_stride_r = stride;
450 WriteMReg((dt3155_lbase[minor] + EVEN_DMA_START),
452 WriteMReg((dt3155_lbase[minor] + ODD_DMA_START),
454 WriteMReg((dt3155_lbase[minor] + EVEN_DMA_STRIDE),
456 WriteMReg((dt3155_lbase[minor] + ODD_DMA_STRIDE),
462 /* 50/60 Hz should be set before this point but let's make sure it is */
465 ReadI2C(dt3155_lbase[minor], CSR2, &i2c_csr2.reg);
466 i2c_csr2.fld.HZ50 = FORMAT50HZ;
467 WriteI2C(dt3155_lbase[minor], CSR2, i2c_csr2.reg);
469 /* enable busmaster chip, clear flags */
473 * shouldn't we be concered with continuous values of
474 * DT3155_SNAP & DT3155_ACQ here? (SS)
478 csr1_r.fld.CAP_CONT_EVE = 1; /* use continuous capture bits to */
479 csr1_r.fld.CAP_CONT_ODD = 1; /* enable */
480 csr1_r.fld.FLD_DN_EVE = 1; /* writing a 1 clears flags */
481 csr1_r.fld.FLD_DN_ODD = 1;
482 csr1_r.fld.SRST = 1; /* reset - must be 1 */
483 csr1_r.fld.FIFO_EN = 1; /* fifo control - must be 1 */
484 csr1_r.fld.FLD_CRPT_EVE = 1; /* writing a 1 clears flags */
485 csr1_r.fld.FLD_CRPT_ODD = 1;
487 WriteMReg((dt3155_lbase[minor] + CSR1),csr1_r.reg);
489 /* Enable interrupts at the end of each field */
492 int_csr_r.fld.FLD_END_EVE_EN = 1;
493 int_csr_r.fld.FLD_END_ODD_EN = 1;
494 int_csr_r.fld.FLD_START_EN = 0;
496 WriteMReg((dt3155_lbase[minor] + INT_CSR), int_csr_r.reg);
498 /* start internal BUSY bits */
500 ReadI2C(dt3155_lbase[minor], CSR2, &i2c_csr2.reg);
501 i2c_csr2.fld.BUSY_ODD = 1;
502 i2c_csr2.fld.BUSY_EVE = 1;
503 WriteI2C(dt3155_lbase[minor], CSR2, i2c_csr2.reg);
505 /* Now its up to the interrupt routine!! */
511 /*****************************************************
514 *****************************************************/
515 static int dt3155_ioctl(struct inode *inode,
520 int minor = MINOR(inode->i_rdev); /* What device are we ioctl()'ing? */
521 void __user *up = (void __user *)arg;
523 if (minor >= MAXBOARDS || minor < 0)
526 /* make sure it is valid command */
527 if (_IOC_NR(cmd) > DT3155_IOC_MAXNR)
529 printk("DT3155: invalid IOCTL(0x%x)\n",cmd);
530 printk("DT3155: Valid commands (0x%x), (0x%x), (0x%x), (0x%x), (0x%x)\n",
531 (unsigned int)DT3155_GET_CONFIG,
532 (unsigned int)DT3155_SET_CONFIG,
533 (unsigned int)DT3155_START,
534 (unsigned int)DT3155_STOP,
535 (unsigned int)DT3155_FLUSH);
541 case DT3155_SET_CONFIG:
543 if (dt3155_status[minor].state != DT3155_STATE_IDLE)
547 struct dt3155_config tmp;
548 if (copy_from_user(&tmp, up, sizeof(tmp)))
550 /* check for valid settings */
551 if (tmp.rows > DT3155_MAX_ROWS ||
552 tmp.cols > DT3155_MAX_COLS ||
553 (tmp.acq_mode != DT3155_MODE_FRAME &&
554 tmp.acq_mode != DT3155_MODE_FIELD) ||
555 (tmp.continuous != DT3155_SNAP &&
556 tmp.continuous != DT3155_ACQ))
560 dt3155_status[minor].config = tmp;
564 case DT3155_GET_CONFIG:
566 if (copy_to_user(up, &dt3155_status[minor],
567 sizeof(struct dt3155_status)))
571 case DT3155_FLUSH: /* Flushes the buffers -- ensures fresh data */
573 if (dt3155_status[minor].state != DT3155_STATE_IDLE)
575 return dt3155_flush(minor);
579 if (dt3155_status[minor].state & DT3155_STATE_STOP ||
580 dt3155_status[minor].fbuffer.stop_acquire)
583 if (dt3155_status[minor].state == DT3155_STATE_IDLE)
587 if (copy_to_user(up, &dt3155_status[minor],
588 sizeof(struct dt3155_status)))
594 if (dt3155_status[minor].state != DT3155_STATE_IDLE)
597 dt3155_status[minor].fbuffer.stop_acquire = 0;
598 dt3155_status[minor].fbuffer.frame_count = 0;
600 /* Set the MODE in the status -- we default to FRAME */
601 if (dt3155_status[minor].config.acq_mode == DT3155_MODE_FIELD)
603 dt3155_status[minor].state = DT3155_STATE_FLD;
607 dt3155_status[minor].state = DT3155_STATE_FRAME;
610 dt3155_init_isr(minor);
611 if (copy_to_user(up, &dt3155_status[minor],
612 sizeof(struct dt3155_status)))
618 printk("DT3155: invalid IOCTL(0x%x)\n",cmd);
619 printk("DT3155: Valid commands (0x%x), (0x%x), (0x%x), (0x%x), (0x%x)\n",
620 (unsigned int)DT3155_GET_CONFIG,
621 (unsigned int)DT3155_SET_CONFIG,
622 DT3155_START, DT3155_STOP, DT3155_FLUSH);
629 /*****************************************************
632 * only allow the user to mmap the registers and buffer
633 * It is quite possible that this is broken, since the
634 * addition of of the capacity for two cards!!!!!!!!
635 * It *looks* like it should work but since I'm not
636 * sure how to use it, I'm not actually sure. (NJC? ditto by SS)
637 *****************************************************/
638 static int dt3155_mmap (struct file * file, struct vm_area_struct * vma)
640 /* which device are we mmapping? */
641 int minor = MINOR(file->f_dentry->d_inode->i_rdev);
642 unsigned long offset;
643 offset = vma->vm_pgoff << PAGE_SHIFT;
645 if (offset >= __pa(high_memory) || (file->f_flags & O_SYNC))
646 vma->vm_flags |= VM_IO;
648 /* Don't try to swap out physical pages.. */
649 vma->vm_flags |= VM_RESERVED;
651 /* they are mapping the registers or the buffer */
652 if ((offset == dt3155_status[minor].reg_addr &&
653 vma->vm_end - vma->vm_start == PCI_PAGE_SIZE) ||
654 (offset == dt3155_status[minor].mem_addr &&
655 vma->vm_end - vma->vm_start == dt3155_status[minor].mem_size))
657 if (remap_pfn_range(vma,
659 offset >> PAGE_SHIFT,
660 vma->vm_end - vma->vm_start,
661 vma->vm_page_prot)) {
662 printk("DT3155: remap_page_range() failed.\n");
668 printk("DT3155: dt3155_mmap() bad call.\n");
676 /*****************************************************
679 * Our special open code.
680 * MOD_INC_USE_COUNT make sure that the driver memory is not freed
681 * while the device is in use.
682 *****************************************************/
683 static int dt3155_open(struct inode* inode, struct file* filep)
685 int minor = MINOR(inode->i_rdev); /* what device are we opening? */
686 if (dt3155_dev_open[minor]) {
687 printk ("DT3155: Already opened by another process.\n");
691 if (dt3155_status[minor].device_installed==0)
693 printk("DT3155 Open Error: No such device dt3155 minor number %d\n",
698 if (dt3155_status[minor].state != DT3155_STATE_IDLE) {
699 printk ("DT3155: Not in idle state (state = %x)\n",
700 dt3155_status[minor].state);
704 printk("DT3155: Device opened.\n");
706 dt3155_dev_open[minor] = 1 ;
710 /* Disable ALL interrupts */
712 WriteMReg((dt3155_lbase[minor] + INT_CSR), int_csr_r.reg);
714 init_waitqueue_head(&(dt3155_read_wait_queue[minor]));
720 /*****************************************************
723 * Now decrement the use count.
725 *****************************************************/
726 static int dt3155_close(struct inode *inode, struct file *filep)
730 minor = MINOR(inode->i_rdev); /* which device are we closing */
731 if (!dt3155_dev_open[minor])
733 printk("DT3155: attempt to CLOSE a not OPEN device\n");
737 dt3155_dev_open[minor] = 0;
739 if (dt3155_status[minor].state != DT3155_STATE_IDLE)
747 /*****************************************************
750 *****************************************************/
751 static ssize_t dt3155_read(struct file *filep, char __user *buf,
752 size_t count, loff_t *ppos)
754 /* which device are we reading from? */
755 int minor = MINOR(filep->f_dentry->d_inode->i_rdev);
758 struct frame_info *frame_info;
760 /* TODO: this should check the error flag and */
761 /* return an error on hardware failures */
762 if (count != sizeof(struct dt3155_read))
764 printk("DT3155 ERROR (NJC): count is not right\n");
769 /* Hack here -- I'm going to allow reading even when idle.
770 * this is so that the frames can be read after STOP has
771 * been called. Leaving it here, commented out, as a reminder
772 * for a short while to make sure there are no problems.
773 * Note that if the driver is not opened in non_blocking mode,
774 * and the device is idle, then it could sit here forever! */
776 /* if (dt3155_status[minor].state == DT3155_STATE_IDLE)*/
779 /* non-blocking reads should return if no data */
780 if (filep->f_flags & O_NDELAY)
782 if ((frame_index = dt3155_get_ready_buffer(minor)) < 0) {
783 /*printk("dt3155: no buffers available (?)\n");*/
784 /* printques(minor); */
791 * sleep till data arrives , or we get interrupted.
792 * Note that wait_event_interruptible() does not actually
793 * sleep/wait if it's condition evaluates to true upon entry.
795 wait_event_interruptible(dt3155_read_wait_queue[minor],
796 (frame_index = dt3155_get_ready_buffer(minor))
801 printk ("DT3155: read: interrupted\n");
808 frame_info = &dt3155_status[minor].fbuffer.frame_info[frame_index];
810 /* make this an offset */
811 offset = frame_info->addr - dt3155_status[minor].mem_addr;
813 put_user(offset, (unsigned int __user *)buf);
815 put_user(dt3155_status[minor].fbuffer.frame_count, (unsigned int __user *)buf);
817 put_user(dt3155_status[minor].state, (unsigned int __user *)buf);
819 if (copy_to_user(buf, frame_info, sizeof(*frame_info)))
822 return sizeof(struct dt3155_read);
825 static unsigned int dt3155_poll (struct file * filp, poll_table *wait)
827 int minor = MINOR(filp->f_dentry->d_inode->i_rdev);
829 if (!is_ready_buf_empty(minor))
830 return POLLIN | POLLRDNORM;
832 poll_wait (filp, &dt3155_read_wait_queue[minor], wait);
838 dt3155_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
843 ret = dt3155_ioctl(file->f_path.dentry->d_inode, file, cmd, arg);
849 /*****************************************************
850 * file operations supported by DT3155 driver
851 * needed by init_module
853 *****************************************************/
854 static struct file_operations dt3155_fops = {
856 .unlocked_ioctl = dt3155_unlocked_ioctl,
860 .release = dt3155_close
864 /*****************************************************
867 * PCI has been totally reworked in 2.1..
868 *****************************************************/
869 static int find_PCI (void)
871 struct pci_dev *pci_dev = NULL;
872 int error, pci_index = 0;
873 unsigned short rev_device;
877 while ((pci_dev = pci_get_device
878 (DT3155_VENDORID, DT3155_DEVICEID, pci_dev)) != NULL)
882 /* Is it really there? */
884 pci_read_config_word(pci_dev, PCI_CLASS_DEVICE, &rev_device)))
888 DT_3155_DEBUG_MSG("DT3155: Device number %d \n", pci_index);
890 /* Make sure the driver was compiled with enough buffers to handle
892 if (pci_index > MAXBOARDS) {
893 printk("DT3155: ERROR - found %d devices, but driver only configured "
895 "DT3155: Please change MAXBOARDS in dt3155.h\n",
896 pci_index, MAXBOARDS);
900 /* Now, just go out and make sure that this/these device(s) is/are
901 actually mapped into the kernel address space */
902 if ((error = pci_read_config_dword(pci_dev, PCI_BASE_ADDRESS_0,
905 printk("DT3155: Was not able to find device \n");
909 DT_3155_DEBUG_MSG("DT3155: Base address 0 for device is %lx \n", base);
910 dt3155_status[pci_index-1].reg_addr = base;
912 /* Remap the base address to a logical address through which we
914 dt3155_lbase[pci_index - 1] = ioremap(base,PCI_PAGE_SIZE);
915 dt3155_status[pci_index - 1].reg_addr = base;
916 DT_3155_DEBUG_MSG("DT3155: New logical address is %p \n",
917 dt3155_lbase[pci_index-1]);
918 if (!dt3155_lbase[pci_index-1])
920 printk("DT3155: Unable to remap control registers\n");
924 if ((error = pci_read_config_byte(pci_dev, PCI_INTERRUPT_LINE, &irq)))
926 printk("DT3155: Was not able to find device \n");
930 DT_3155_DEBUG_MSG("DT3155: IRQ is %d \n",irq);
931 dt3155_status[pci_index-1].irq = irq;
932 /* Set flag: kth device found! */
933 dt3155_status[pci_index-1].device_installed = 1;
934 printk("DT3155: Installing device %d w/irq %d and address %p\n",
936 dt3155_status[pci_index-1].irq,
937 dt3155_lbase[pci_index-1]);
940 ndevices = pci_index;
945 pci_dev_put(pci_dev);
949 u32 allocatorAddr = 0;
951 /*****************************************************
953 *****************************************************/
954 int init_module(void)
958 char *devname[MAXBOARDS];
960 devname[0] = "dt3155a";
962 devname[1] = "dt3155b";
965 printk("DT3155: Loading module...\n");
967 /* Register the device driver */
968 rcode = register_chrdev(dt3155_major, "dt3155", &dt3155_fops);
971 printk(KERN_INFO "DT3155: register_chrdev failed \n");
975 if(dt3155_major == 0)
976 dt3155_major = rcode; /* dynamic */
979 /* init the status variables. */
980 /* DMA memory is taken care of in setup_buffers() */
981 for (index = 0; index < MAXBOARDS; index++)
983 dt3155_status[index].config.acq_mode = DT3155_MODE_FRAME;
984 dt3155_status[index].config.continuous = DT3155_ACQ;
985 dt3155_status[index].config.cols = DT3155_MAX_COLS;
986 dt3155_status[index].config.rows = DT3155_MAX_ROWS;
987 dt3155_status[index].state = DT3155_STATE_IDLE;
989 /* find_PCI() will check if devices are installed; */
990 /* first assume they're not: */
991 dt3155_status[index].mem_addr = 0;
992 dt3155_status[index].mem_size = 0;
993 dt3155_status[index].state = DT3155_STATE_IDLE;
994 dt3155_status[index].device_installed = 0;
997 /* Now let's find the hardware. find_PCI() will set ndevices to the
998 * number of cards found in this machine. */
1000 if ((rcode = find_PCI()) != 0)
1002 printk("DT3155 error: find_PCI() failed to find dt3155 board(s)\n");
1003 unregister_chrdev(dt3155_major, "dt3155");
1008 /* Ok, time to setup the frame buffers */
1009 if((rcode = dt3155_setup_buffers(&allocatorAddr)) < 0)
1011 printk("DT3155: Error: setting up buffer not large enough.");
1012 unregister_chrdev(dt3155_major, "dt3155");
1016 /* If we are this far, then there is enough RAM */
1017 /* for the buffers: Print the configuration. */
1018 for( index = 0; index < ndevices; index++)
1020 printk("DT3155: Device = %d; acq_mode = %d; "
1021 "continuous = %d; cols = %d; rows = %d;\n",
1023 dt3155_status[index].config.acq_mode,
1024 dt3155_status[index].config.continuous,
1025 dt3155_status[index].config.cols,
1026 dt3155_status[index].config.rows);
1027 printk("DT3155: m_addr = 0x%x; m_size = %ld; "
1028 "state = %d; device_installed = %d\n",
1029 dt3155_status[index].mem_addr,
1030 (long int)dt3155_status[index].mem_size,
1031 dt3155_status[index].state,
1032 dt3155_status[index].device_installed);
1035 /* Disable ALL interrupts */
1037 for( index = 0; index < ndevices; index++)
1039 WriteMReg((dt3155_lbase[index] + INT_CSR), int_csr_r.reg);
1040 if(dt3155_status[index].device_installed)
1043 * This driver *looks* like it can handle sharing interrupts,
1044 * but I can't actually test myself. I've had reports that it
1045 * DOES work so I'll enable it for now. This comment will remain
1046 * as a reminder in case any problems arise. (SS)
1048 /* in older kernels flags are: SA_SHIRQ | SA_INTERRUPT */
1049 rcode = request_irq(dt3155_status[index].irq, (void *)dt3155_isr,
1050 IRQF_SHARED | IRQF_DISABLED, devname[index],
1051 (void*) &dt3155_status[index]);
1054 printk("DT3155: minor %d request_irq failed for IRQ %d\n",
1055 index, dt3155_status[index].irq);
1056 unregister_chrdev(dt3155_major, "dt3155");
1062 printk("DT3155: finished loading\n");
1067 /*****************************************************
1068 * cleanup_module(void)
1070 *****************************************************/
1071 void cleanup_module(void)
1075 printk("DT3155: cleanup_module called\n");
1077 /* removed DMA allocated with the allocator */
1078 #ifdef STANDALONE_ALLOCATOR
1079 if (allocatorAddr != 0)
1080 allocator_free_dma(allocatorAddr);
1082 allocator_cleanup();
1085 unregister_chrdev(dt3155_major, "dt3155");
1087 for(index = 0; index < ndevices; index++)
1089 if(dt3155_status[index].device_installed == 1)
1091 printk("DT3155: Freeing irq %d for device %d\n",
1092 dt3155_status[index].irq, index);
1093 free_irq(dt3155_status[index].irq, (void*)&dt3155_status[index]);