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1/*
2 * Copyright (C) 2009 Texas Instruments Inc
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
17 *
18 * TODO : add support for VBI & HBI data service
19 *	  add static buffer allocation
20 */
21#include <linux/kernel.h>
22#include <linux/init.h>
23#include <linux/module.h>
24#include <linux/errno.h>
25#include <linux/fs.h>
26#include <linux/mm.h>
27#include <linux/interrupt.h>
28#include <linux/workqueue.h>
29#include <linux/string.h>
30#include <linux/videodev2.h>
31#include <linux/wait.h>
32#include <linux/time.h>
33#include <linux/i2c.h>
34#include <linux/platform_device.h>
35#include <linux/io.h>
36#include <linux/version.h>
37#include <linux/slab.h>
38#include <media/v4l2-device.h>
39#include <media/v4l2-ioctl.h>
40
41#include "vpif_capture.h"
42#include "vpif.h"
43
44MODULE_DESCRIPTION("TI DaVinci VPIF Capture driver");
45MODULE_LICENSE("GPL");
46
47#define vpif_err(fmt, arg...)	v4l2_err(&vpif_obj.v4l2_dev, fmt, ## arg)
48#define vpif_dbg(level, debug, fmt, arg...)	\
49		v4l2_dbg(level, debug, &vpif_obj.v4l2_dev, fmt, ## arg)
50
51static int debug = 1;
52static u32 ch0_numbuffers = 3;
53static u32 ch1_numbuffers = 3;
54static u32 ch0_bufsize = 1920 * 1080 * 2;
55static u32 ch1_bufsize = 720 * 576 * 2;
56
57module_param(debug, int, 0644);
58module_param(ch0_numbuffers, uint, S_IRUGO);
59module_param(ch1_numbuffers, uint, S_IRUGO);
60module_param(ch0_bufsize, uint, S_IRUGO);
61module_param(ch1_bufsize, uint, S_IRUGO);
62
63MODULE_PARM_DESC(debug, "Debug level 0-1");
64MODULE_PARM_DESC(ch2_numbuffers, "Channel0 buffer count (default:3)");
65MODULE_PARM_DESC(ch3_numbuffers, "Channel1 buffer count (default:3)");
66MODULE_PARM_DESC(ch2_bufsize, "Channel0 buffer size (default:1920 x 1080 x 2)");
67MODULE_PARM_DESC(ch3_bufsize, "Channel1 buffer size (default:720 x 576 x 2)");
68
69static struct vpif_config_params config_params = {
70	.min_numbuffers = 3,
71	.numbuffers[0] = 3,
72	.numbuffers[1] = 3,
73	.min_bufsize[0] = 720 * 480 * 2,
74	.min_bufsize[1] = 720 * 480 * 2,
75	.channel_bufsize[0] = 1920 * 1080 * 2,
76	.channel_bufsize[1] = 720 * 576 * 2,
77};
78
79/* global variables */
80static struct vpif_device vpif_obj = { {NULL} };
81static struct device *vpif_dev;
82
83/**
84 * ch_params: video standard configuration parameters for vpif
85 */
86static const struct vpif_channel_config_params ch_params[] = {
87	{
88		"NTSC_M", 720, 480, 30, 0, 1, 268, 1440, 1, 23, 263, 266,
89		286, 525, 525, 0, 1, 0, V4L2_STD_525_60,
90	},
91	{
92		"PAL_BDGHIK", 720, 576, 25, 0, 1, 280, 1440, 1, 23, 311, 313,
93		336, 624, 625, 0, 1, 0, V4L2_STD_625_50,
94	},
95};
96
97/**
98 * vpif_uservirt_to_phys : translate user/virtual address to phy address
99 * @virtp: user/virtual address
100 *
101 * This inline function is used to convert user space virtual address to
102 * physical address.
103 */
104static inline u32 vpif_uservirt_to_phys(u32 virtp)
105{
106	unsigned long physp = 0;
107	struct mm_struct *mm = current->mm;
108	struct vm_area_struct *vma;
109
110	vma = find_vma(mm, virtp);
111
112	/* For kernel direct-mapped memory, take the easy way */
113	if (virtp >= PAGE_OFFSET)
114		physp = virt_to_phys((void *)virtp);
115	else if (vma && (vma->vm_flags & VM_IO) && (vma->vm_pgoff))
116		/**
117		 * this will catch, kernel-allocated, mmaped-to-usermode
118		 * addresses
119		 */
120		physp = (vma->vm_pgoff << PAGE_SHIFT) + (virtp - vma->vm_start);
121	else {
122		/* otherwise, use get_user_pages() for general userland pages */
123		int res, nr_pages = 1;
124			struct page *pages;
125
126		down_read(&current->mm->mmap_sem);
127
128		res = get_user_pages(current, current->mm,
129				     virtp, nr_pages, 1, 0, &pages, NULL);
130		up_read(&current->mm->mmap_sem);
131
132		if (res == nr_pages)
133			physp = __pa(page_address(&pages[0]) +
134				     (virtp & ~PAGE_MASK));
135		else {
136			vpif_err("get_user_pages failed\n");
137			return 0;
138		}
139	}
140	return physp;
141}
142
143/**
144 * buffer_prepare :  callback function for buffer prepare
145 * @q : buffer queue ptr
146 * @vb: ptr to video buffer
147 * @field: field info
148 *
149 * This is the callback function for buffer prepare when videobuf_qbuf()
150 * function is called. The buffer is prepared and user space virtual address
151 * or user address is converted into  physical address
152 */
153static int vpif_buffer_prepare(struct videobuf_queue *q,
154			       struct videobuf_buffer *vb,
155			       enum v4l2_field field)
156{
157	/* Get the file handle object and channel object */
158	struct vpif_fh *fh = q->priv_data;
159	struct channel_obj *ch = fh->channel;
160	struct common_obj *common;
161	unsigned long addr;
162
163
164	vpif_dbg(2, debug, "vpif_buffer_prepare\n");
165
166	common = &ch->common[VPIF_VIDEO_INDEX];
167
168	/* If buffer is not initialized, initialize it */
169	if (VIDEOBUF_NEEDS_INIT == vb->state) {
170		vb->width = common->width;
171		vb->height = common->height;
172		vb->size = vb->width * vb->height;
173		vb->field = field;
174	}
175	vb->state = VIDEOBUF_PREPARED;
176	/**
177	 * if user pointer memory mechanism is used, get the physical
178	 * address of the buffer
179	 */
180	if (V4L2_MEMORY_USERPTR == common->memory) {
181		if (0 == vb->baddr) {
182			vpif_dbg(1, debug, "buffer address is 0\n");
183			return -EINVAL;
184
185		}
186		vb->boff = vpif_uservirt_to_phys(vb->baddr);
187		if (!IS_ALIGNED(vb->boff, 8))
188			goto exit;
189	}
190
191	addr = vb->boff;
192	if (q->streaming) {
193		if (!IS_ALIGNED((addr + common->ytop_off), 8) ||
194		    !IS_ALIGNED((addr + common->ybtm_off), 8) ||
195		    !IS_ALIGNED((addr + common->ctop_off), 8) ||
196		    !IS_ALIGNED((addr + common->cbtm_off), 8))
197			goto exit;
198	}
199	return 0;
200exit:
201	vpif_dbg(1, debug, "buffer_prepare:offset is not aligned to 8 bytes\n");
202	return -EINVAL;
203}
204
205/**
206 * vpif_buffer_setup : Callback function for buffer setup.
207 * @q: buffer queue ptr
208 * @count: number of buffers
209 * @size: size of the buffer
210 *
211 * This callback function is called when reqbuf() is called to adjust
212 * the buffer count and buffer size
213 */
214static int vpif_buffer_setup(struct videobuf_queue *q, unsigned int *count,
215			     unsigned int *size)
216{
217	/* Get the file handle object and channel object */
218	struct vpif_fh *fh = q->priv_data;
219	struct channel_obj *ch = fh->channel;
220	struct common_obj *common;
221
222	common = &ch->common[VPIF_VIDEO_INDEX];
223
224	vpif_dbg(2, debug, "vpif_buffer_setup\n");
225
226	/* If memory type is not mmap, return */
227	if (V4L2_MEMORY_MMAP != common->memory)
228		return 0;
229
230	/* Calculate the size of the buffer */
231	*size = config_params.channel_bufsize[ch->channel_id];
232
233	if (*count < config_params.min_numbuffers)
234		*count = config_params.min_numbuffers;
235	return 0;
236}
237
238/**
239 * vpif_buffer_queue : Callback function to add buffer to DMA queue
240 * @q: ptr to videobuf_queue
241 * @vb: ptr to videobuf_buffer
242 */
243static void vpif_buffer_queue(struct videobuf_queue *q,
244			      struct videobuf_buffer *vb)
245{
246	/* Get the file handle object and channel object */
247	struct vpif_fh *fh = q->priv_data;
248	struct channel_obj *ch = fh->channel;
249	struct common_obj *common;
250
251	common = &ch->common[VPIF_VIDEO_INDEX];
252
253	vpif_dbg(2, debug, "vpif_buffer_queue\n");
254
255	/* add the buffer to the DMA queue */
256	list_add_tail(&vb->queue, &common->dma_queue);
257	/* Change state of the buffer */
258	vb->state = VIDEOBUF_QUEUED;
259}
260
261/**
262 * vpif_buffer_release : Callback function to free buffer
263 * @q: buffer queue ptr
264 * @vb: ptr to video buffer
265 *
266 * This function is called from the videobuf layer to free memory
267 * allocated to  the buffers
268 */
269static void vpif_buffer_release(struct videobuf_queue *q,
270				struct videobuf_buffer *vb)
271{
272	/* Get the file handle object and channel object */
273	struct vpif_fh *fh = q->priv_data;
274	struct channel_obj *ch = fh->channel;
275	struct common_obj *common;
276
277	common = &ch->common[VPIF_VIDEO_INDEX];
278
279	videobuf_dma_contig_free(q, vb);
280	vb->state = VIDEOBUF_NEEDS_INIT;
281}
282
283static struct videobuf_queue_ops video_qops = {
284	.buf_setup = vpif_buffer_setup,
285	.buf_prepare = vpif_buffer_prepare,
286	.buf_queue = vpif_buffer_queue,
287	.buf_release = vpif_buffer_release,
288};
289
290static u8 channel_first_int[VPIF_NUMBER_OF_OBJECTS][2] =
291	{ {1, 1} };
292
293/**
294 * vpif_process_buffer_complete: process a completed buffer
295 * @common: ptr to common channel object
296 *
297 * This function time stamp the buffer and mark it as DONE. It also
298 * wake up any process waiting on the QUEUE and set the next buffer
299 * as current
300 */
301static void vpif_process_buffer_complete(struct common_obj *common)
302{
303	do_gettimeofday(&common->cur_frm->ts);
304	common->cur_frm->state = VIDEOBUF_DONE;
305	wake_up_interruptible(&common->cur_frm->done);
306	/* Make curFrm pointing to nextFrm */
307	common->cur_frm = common->next_frm;
308}
309
310/**
311 * vpif_schedule_next_buffer: set next buffer address for capture
312 * @common : ptr to common channel object
313 *
314 * This function will get next buffer from the dma queue and
315 * set the buffer address in the vpif register for capture.
316 * the buffer is marked active
317 */
318static void vpif_schedule_next_buffer(struct common_obj *common)
319{
320	unsigned long addr = 0;
321
322	common->next_frm = list_entry(common->dma_queue.next,
323				     struct videobuf_buffer, queue);
324	/* Remove that buffer from the buffer queue */
325	list_del(&common->next_frm->queue);
326	common->next_frm->state = VIDEOBUF_ACTIVE;
327	if (V4L2_MEMORY_USERPTR == common->memory)
328		addr = common->next_frm->boff;
329	else
330		addr = videobuf_to_dma_contig(common->next_frm);
331
332	/* Set top and bottom field addresses in VPIF registers */
333	common->set_addr(addr + common->ytop_off,
334			 addr + common->ybtm_off,
335			 addr + common->ctop_off,
336			 addr + common->cbtm_off);
337}
338
339/**
340 * vpif_channel_isr : ISR handler for vpif capture
341 * @irq: irq number
342 * @dev_id: dev_id ptr
343 *
344 * It changes status of the captured buffer, takes next buffer from the queue
345 * and sets its address in VPIF  registers
346 */
347static irqreturn_t vpif_channel_isr(int irq, void *dev_id)
348{
349	struct vpif_device *dev = &vpif_obj;
350	struct common_obj *common;
351	struct channel_obj *ch;
352	enum v4l2_field field;
353	int channel_id = 0;
354	int fid = -1, i;
355
356	channel_id = *(int *)(dev_id);
357	ch = dev->dev[channel_id];
358
359	field = ch->common[VPIF_VIDEO_INDEX].fmt.fmt.pix.field;
360
361	for (i = 0; i < VPIF_NUMBER_OF_OBJECTS; i++) {
362		common = &ch->common[i];
363		/* skip If streaming is not started in this channel */
364		if (0 == common->started)
365			continue;
366
367		/* Check the field format */
368		if (1 == ch->vpifparams.std_info.frm_fmt) {
369			/* Progressive mode */
370			if (list_empty(&common->dma_queue))
371				continue;
372
373			if (!channel_first_int[i][channel_id])
374				vpif_process_buffer_complete(common);
375
376			channel_first_int[i][channel_id] = 0;
377
378			vpif_schedule_next_buffer(common);
379
380
381			channel_first_int[i][channel_id] = 0;
382		} else {
383			/**
384			 * Interlaced mode. If it is first interrupt, ignore
385			 * it
386			 */
387			if (channel_first_int[i][channel_id]) {
388				channel_first_int[i][channel_id] = 0;
389				continue;
390			}
391			if (0 == i) {
392				ch->field_id ^= 1;
393				/* Get field id from VPIF registers */
394				fid = vpif_channel_getfid(ch->channel_id);
395				if (fid != ch->field_id) {
396					/**
397					 * If field id does not match stored
398					 * field id, make them in sync
399					 */
400					if (0 == fid)
401						ch->field_id = fid;
402					return IRQ_HANDLED;
403				}
404			}
405			/* device field id and local field id are in sync */
406			if (0 == fid) {
407				/* this is even field */
408				if (common->cur_frm == common->next_frm)
409					continue;
410
411				/* mark the current buffer as done */
412				vpif_process_buffer_complete(common);
413			} else if (1 == fid) {
414				/* odd field */
415				if (list_empty(&common->dma_queue) ||
416				    (common->cur_frm != common->next_frm))
417					continue;
418
419				vpif_schedule_next_buffer(common);
420			}
421		}
422	}
423	return IRQ_HANDLED;
424}
425
426/**
427 * vpif_update_std_info() - update standard related info
428 * @ch: ptr to channel object
429 *
430 * For a given standard selected by application, update values
431 * in the device data structures
432 */
433static int vpif_update_std_info(struct channel_obj *ch)
434{
435	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
436	struct vpif_params *vpifparams = &ch->vpifparams;
437	const struct vpif_channel_config_params *config;
438	struct vpif_channel_config_params *std_info;
439	struct video_obj *vid_ch = &ch->video;
440	int index;
441
442	vpif_dbg(2, debug, "vpif_update_std_info\n");
443
444	std_info = &vpifparams->std_info;
445
446	for (index = 0; index < ARRAY_SIZE(ch_params); index++) {
447		config = &ch_params[index];
448		if (config->stdid & vid_ch->stdid) {
449			memcpy(std_info, config, sizeof(*config));
450			break;
451		}
452	}
453
454	/* standard not found */
455	if (index == ARRAY_SIZE(ch_params))
456		return -EINVAL;
457
458	common->fmt.fmt.pix.width = std_info->width;
459	common->width = std_info->width;
460	common->fmt.fmt.pix.height = std_info->height;
461	common->height = std_info->height;
462	common->fmt.fmt.pix.bytesperline = std_info->width;
463	vpifparams->video_params.hpitch = std_info->width;
464	vpifparams->video_params.storage_mode = std_info->frm_fmt;
465	return 0;
466}
467
468/**
469 * vpif_calculate_offsets : This function calculates buffers offsets
470 * @ch : ptr to channel object
471 *
472 * This function calculates buffer offsets for Y and C in the top and
473 * bottom field
474 */
475static void vpif_calculate_offsets(struct channel_obj *ch)
476{
477	unsigned int hpitch, vpitch, sizeimage;
478	struct video_obj *vid_ch = &(ch->video);
479	struct vpif_params *vpifparams = &ch->vpifparams;
480	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
481	enum v4l2_field field = common->fmt.fmt.pix.field;
482
483	vpif_dbg(2, debug, "vpif_calculate_offsets\n");
484
485	if (V4L2_FIELD_ANY == field) {
486		if (vpifparams->std_info.frm_fmt)
487			vid_ch->buf_field = V4L2_FIELD_NONE;
488		else
489			vid_ch->buf_field = V4L2_FIELD_INTERLACED;
490	} else
491		vid_ch->buf_field = common->fmt.fmt.pix.field;
492
493	if (V4L2_MEMORY_USERPTR == common->memory)
494		sizeimage = common->fmt.fmt.pix.sizeimage;
495	else
496		sizeimage = config_params.channel_bufsize[ch->channel_id];
497
498	hpitch = common->fmt.fmt.pix.bytesperline;
499	vpitch = sizeimage / (hpitch * 2);
500
501	if ((V4L2_FIELD_NONE == vid_ch->buf_field) ||
502	    (V4L2_FIELD_INTERLACED == vid_ch->buf_field)) {
503		/* Calculate offsets for Y top, Y Bottom, C top and C Bottom */
504		common->ytop_off = 0;
505		common->ybtm_off = hpitch;
506		common->ctop_off = sizeimage / 2;
507		common->cbtm_off = sizeimage / 2 + hpitch;
508	} else if (V4L2_FIELD_SEQ_TB == vid_ch->buf_field) {
509		/* Calculate offsets for Y top, Y Bottom, C top and C Bottom */
510		common->ytop_off = 0;
511		common->ybtm_off = sizeimage / 4;
512		common->ctop_off = sizeimage / 2;
513		common->cbtm_off = common->ctop_off + sizeimage / 4;
514	} else if (V4L2_FIELD_SEQ_BT == vid_ch->buf_field) {
515		/* Calculate offsets for Y top, Y Bottom, C top and C Bottom */
516		common->ybtm_off = 0;
517		common->ytop_off = sizeimage / 4;
518		common->cbtm_off = sizeimage / 2;
519		common->ctop_off = common->cbtm_off + sizeimage / 4;
520	}
521	if ((V4L2_FIELD_NONE == vid_ch->buf_field) ||
522	    (V4L2_FIELD_INTERLACED == vid_ch->buf_field))
523		vpifparams->video_params.storage_mode = 1;
524	else
525		vpifparams->video_params.storage_mode = 0;
526
527	if (1 == vpifparams->std_info.frm_fmt)
528		vpifparams->video_params.hpitch =
529		    common->fmt.fmt.pix.bytesperline;
530	else {
531		if ((field == V4L2_FIELD_ANY)
532		    || (field == V4L2_FIELD_INTERLACED))
533			vpifparams->video_params.hpitch =
534			    common->fmt.fmt.pix.bytesperline * 2;
535		else
536			vpifparams->video_params.hpitch =
537			    common->fmt.fmt.pix.bytesperline;
538	}
539
540	ch->vpifparams.video_params.stdid = vpifparams->std_info.stdid;
541}
542
543/**
544 * vpif_config_format: configure default frame format in the device
545 * ch : ptr to channel object
546 */
547static void vpif_config_format(struct channel_obj *ch)
548{
549	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
550
551	vpif_dbg(2, debug, "vpif_config_format\n");
552
553	common->fmt.fmt.pix.field = V4L2_FIELD_ANY;
554	if (config_params.numbuffers[ch->channel_id] == 0)
555		common->memory = V4L2_MEMORY_USERPTR;
556	else
557		common->memory = V4L2_MEMORY_MMAP;
558
559	common->fmt.fmt.pix.sizeimage
560	    = config_params.channel_bufsize[ch->channel_id];
561
562	if (ch->vpifparams.iface.if_type == VPIF_IF_RAW_BAYER)
563		common->fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_SBGGR8;
564	else
565		common->fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUV422P;
566	common->fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
567}
568
569/**
570 * vpif_get_default_field() - Get default field type based on interface
571 * @vpif_params - ptr to vpif params
572 */
573static inline enum v4l2_field vpif_get_default_field(
574				struct vpif_interface *iface)
575{
576	return (iface->if_type == VPIF_IF_RAW_BAYER) ? V4L2_FIELD_NONE :
577						V4L2_FIELD_INTERLACED;
578}
579
580/**
581 * vpif_check_format()  - check given pixel format for compatibility
582 * @ch - channel  ptr
583 * @pixfmt - Given pixel format
584 * @update - update the values as per hardware requirement
585 *
586 * Check the application pixel format for S_FMT and update the input
587 * values as per hardware limits for TRY_FMT. The default pixel and
588 * field format is selected based on interface type.
589 */
590static int vpif_check_format(struct channel_obj *ch,
591			     struct v4l2_pix_format *pixfmt,
592			     int update)
593{
594	struct common_obj *common = &(ch->common[VPIF_VIDEO_INDEX]);
595	struct vpif_params *vpif_params = &ch->vpifparams;
596	enum v4l2_field field = pixfmt->field;
597	u32 sizeimage, hpitch, vpitch;
598	int ret = -EINVAL;
599
600	vpif_dbg(2, debug, "vpif_check_format\n");
601	/**
602	 * first check for the pixel format. If if_type is Raw bayer,
603	 * only V4L2_PIX_FMT_SBGGR8 format is supported. Otherwise only
604	 * V4L2_PIX_FMT_YUV422P is supported
605	 */
606	if (vpif_params->iface.if_type == VPIF_IF_RAW_BAYER) {
607		if (pixfmt->pixelformat != V4L2_PIX_FMT_SBGGR8) {
608			if (!update) {
609				vpif_dbg(2, debug, "invalid pix format\n");
610				goto exit;
611			}
612			pixfmt->pixelformat = V4L2_PIX_FMT_SBGGR8;
613		}
614	} else {
615		if (pixfmt->pixelformat != V4L2_PIX_FMT_YUV422P) {
616			if (!update) {
617				vpif_dbg(2, debug, "invalid pixel format\n");
618				goto exit;
619			}
620			pixfmt->pixelformat = V4L2_PIX_FMT_YUV422P;
621		}
622	}
623
624	if (!(VPIF_VALID_FIELD(field))) {
625		if (!update) {
626			vpif_dbg(2, debug, "invalid field format\n");
627			goto exit;
628		}
629		/**
630		 * By default use FIELD_NONE for RAW Bayer capture
631		 * and FIELD_INTERLACED for other interfaces
632		 */
633		field = vpif_get_default_field(&vpif_params->iface);
634	} else if (field == V4L2_FIELD_ANY)
635		/* unsupported field. Use default */
636		field = vpif_get_default_field(&vpif_params->iface);
637
638	/* validate the hpitch */
639	hpitch = pixfmt->bytesperline;
640	if (hpitch < vpif_params->std_info.width) {
641		if (!update) {
642			vpif_dbg(2, debug, "invalid hpitch\n");
643			goto exit;
644		}
645		hpitch = vpif_params->std_info.width;
646	}
647
648	if (V4L2_MEMORY_USERPTR == common->memory)
649		sizeimage = pixfmt->sizeimage;
650	else
651		sizeimage = config_params.channel_bufsize[ch->channel_id];
652
653	vpitch = sizeimage / (hpitch * 2);
654
655	/* validate the vpitch */
656	if (vpitch < vpif_params->std_info.height) {
657		if (!update) {
658			vpif_dbg(2, debug, "Invalid vpitch\n");
659			goto exit;
660		}
661		vpitch = vpif_params->std_info.height;
662	}
663
664	/* Check for 8 byte alignment */
665	if (!ALIGN(hpitch, 8)) {
666		if (!update) {
667			vpif_dbg(2, debug, "invalid pitch alignment\n");
668			goto exit;
669		}
670		/* adjust to next 8 byte boundary */
671		hpitch = (((hpitch + 7) / 8) * 8);
672	}
673	/* if update is set, modify the bytesperline and sizeimage */
674	if (update) {
675		pixfmt->bytesperline = hpitch;
676		pixfmt->sizeimage = hpitch * vpitch * 2;
677	}
678	/**
679	 * Image width and height is always based on current standard width and
680	 * height
681	 */
682	pixfmt->width = common->fmt.fmt.pix.width;
683	pixfmt->height = common->fmt.fmt.pix.height;
684	return 0;
685exit:
686	return ret;
687}
688
689/**
690 * vpif_config_addr() - function to configure buffer address in vpif
691 * @ch - channel ptr
692 * @muxmode - channel mux mode
693 */
694static void vpif_config_addr(struct channel_obj *ch, int muxmode)
695{
696	struct common_obj *common;
697
698	vpif_dbg(2, debug, "vpif_config_addr\n");
699
700	common = &(ch->common[VPIF_VIDEO_INDEX]);
701
702	if (VPIF_CHANNEL1_VIDEO == ch->channel_id)
703		common->set_addr = ch1_set_videobuf_addr;
704	else if (2 == muxmode)
705		common->set_addr = ch0_set_videobuf_addr_yc_nmux;
706	else
707		common->set_addr = ch0_set_videobuf_addr;
708}
709
710/**
711 * vpfe_mmap : It is used to map kernel space buffers into user spaces
712 * @filep: file pointer
713 * @vma: ptr to vm_area_struct
714 */
715static int vpif_mmap(struct file *filep, struct vm_area_struct *vma)
716{
717	/* Get the channel object and file handle object */
718	struct vpif_fh *fh = filep->private_data;
719	struct channel_obj *ch = fh->channel;
720	struct common_obj *common = &(ch->common[VPIF_VIDEO_INDEX]);
721
722	vpif_dbg(2, debug, "vpif_mmap\n");
723
724	return videobuf_mmap_mapper(&common->buffer_queue, vma);
725}
726
727/**
728 * vpif_poll: It is used for select/poll system call
729 * @filep: file pointer
730 * @wait: poll table to wait
731 */
732static unsigned int vpif_poll(struct file *filep, poll_table * wait)
733{
734	int err = 0;
735	struct vpif_fh *fh = filep->private_data;
736	struct channel_obj *channel = fh->channel;
737	struct common_obj *common = &(channel->common[VPIF_VIDEO_INDEX]);
738
739	vpif_dbg(2, debug, "vpif_poll\n");
740
741	if (common->started)
742		err = videobuf_poll_stream(filep, &common->buffer_queue, wait);
743
744	return 0;
745}
746
747/**
748 * vpif_open : vpif open handler
749 * @filep: file ptr
750 *
751 * It creates object of file handle structure and stores it in private_data
752 * member of filepointer
753 */
754static int vpif_open(struct file *filep)
755{
756	struct vpif_capture_config *config = vpif_dev->platform_data;
757	struct video_device *vdev = video_devdata(filep);
758	struct common_obj *common;
759	struct video_obj *vid_ch;
760	struct channel_obj *ch;
761	struct vpif_fh *fh;
762	int i, ret = 0;
763
764	vpif_dbg(2, debug, "vpif_open\n");
765
766	ch = video_get_drvdata(vdev);
767
768	vid_ch = &ch->video;
769	common = &ch->common[VPIF_VIDEO_INDEX];
770
771	if (mutex_lock_interruptible(&common->lock))
772		return -ERESTARTSYS;
773
774	if (NULL == ch->curr_subdev_info) {
775		/**
776		 * search through the sub device to see a registered
777		 * sub device and make it as current sub device
778		 */
779		for (i = 0; i < config->subdev_count; i++) {
780			if (vpif_obj.sd[i]) {
781				/* the sub device is registered */
782				ch->curr_subdev_info = &config->subdev_info[i];
783				/* make first input as the current input */
784				vid_ch->input_idx = 0;
785				break;
786			}
787		}
788		if (i == config->subdev_count) {
789			vpif_err("No sub device registered\n");
790			ret = -ENOENT;
791			goto exit;
792		}
793	}
794
795	/* Allocate memory for the file handle object */
796	fh = kmalloc(sizeof(struct vpif_fh), GFP_KERNEL);
797	if (NULL == fh) {
798		vpif_err("unable to allocate memory for file handle object\n");
799		ret = -ENOMEM;
800		goto exit;
801	}
802
803	/* store pointer to fh in private_data member of filep */
804	filep->private_data = fh;
805	fh->channel = ch;
806	fh->initialized = 0;
807	/* If decoder is not initialized. initialize it */
808	if (!ch->initialized) {
809		fh->initialized = 1;
810		ch->initialized = 1;
811		memset(&(ch->vpifparams), 0, sizeof(struct vpif_params));
812	}
813	/* Increment channel usrs counter */
814	ch->usrs++;
815	/* Set io_allowed member to false */
816	fh->io_allowed[VPIF_VIDEO_INDEX] = 0;
817	/* Initialize priority of this instance to default priority */
818	fh->prio = V4L2_PRIORITY_UNSET;
819	v4l2_prio_open(&ch->prio, &fh->prio);
820exit:
821	mutex_unlock(&common->lock);
822	return ret;
823}
824
825/**
826 * vpif_release : function to clean up file close
827 * @filep: file pointer
828 *
829 * This function deletes buffer queue, frees the buffers and the vpfe file
830 * handle
831 */
832static int vpif_release(struct file *filep)
833{
834	struct vpif_fh *fh = filep->private_data;
835	struct channel_obj *ch = fh->channel;
836	struct common_obj *common;
837
838	vpif_dbg(2, debug, "vpif_release\n");
839
840	common = &ch->common[VPIF_VIDEO_INDEX];
841
842	if (mutex_lock_interruptible(&common->lock))
843		return -ERESTARTSYS;
844
845	/* if this instance is doing IO */
846	if (fh->io_allowed[VPIF_VIDEO_INDEX]) {
847		/* Reset io_usrs member of channel object */
848		common->io_usrs = 0;
849		/* Disable channel as per its device type and channel id */
850		if (VPIF_CHANNEL0_VIDEO == ch->channel_id) {
851			enable_channel0(0);
852			channel0_intr_enable(0);
853		}
854		if ((VPIF_CHANNEL1_VIDEO == ch->channel_id) ||
855		    (2 == common->started)) {
856			enable_channel1(0);
857			channel1_intr_enable(0);
858		}
859		common->started = 0;
860		/* Free buffers allocated */
861		videobuf_queue_cancel(&common->buffer_queue);
862		videobuf_mmap_free(&common->buffer_queue);
863	}
864
865	/* Decrement channel usrs counter */
866	ch->usrs--;
867
868	/* unlock mutex on channel object */
869	mutex_unlock(&common->lock);
870
871	/* Close the priority */
872	v4l2_prio_close(&ch->prio, fh->prio);
873
874	if (fh->initialized)
875		ch->initialized = 0;
876
877	filep->private_data = NULL;
878	kfree(fh);
879	return 0;
880}
881
882/**
883 * vpif_reqbufs() - request buffer handler
884 * @file: file ptr
885 * @priv: file handle
886 * @reqbuf: request buffer structure ptr
887 */
888static int vpif_reqbufs(struct file *file, void *priv,
889			struct v4l2_requestbuffers *reqbuf)
890{
891	struct vpif_fh *fh = priv;
892	struct channel_obj *ch = fh->channel;
893	struct common_obj *common;
894	u8 index = 0;
895	int ret = 0;
896
897	vpif_dbg(2, debug, "vpif_reqbufs\n");
898
899	/**
900	 * This file handle has not initialized the channel,
901	 * It is not allowed to do settings
902	 */
903	if ((VPIF_CHANNEL0_VIDEO == ch->channel_id)
904	    || (VPIF_CHANNEL1_VIDEO == ch->channel_id)) {
905		if (!fh->initialized) {
906			vpif_dbg(1, debug, "Channel Busy\n");
907			return -EBUSY;
908		}
909	}
910
911	if (V4L2_BUF_TYPE_VIDEO_CAPTURE != reqbuf->type)
912		return -EINVAL;
913
914	index = VPIF_VIDEO_INDEX;
915
916	common = &ch->common[index];
917
918	if (mutex_lock_interruptible(&common->lock))
919		return -ERESTARTSYS;
920
921	if (0 != common->io_usrs) {
922		ret = -EBUSY;
923		goto reqbuf_exit;
924	}
925
926	/* Initialize videobuf queue as per the buffer type */
927	videobuf_queue_dma_contig_init(&common->buffer_queue,
928					    &video_qops, NULL,
929					    &common->irqlock,
930					    reqbuf->type,
931					    common->fmt.fmt.pix.field,
932					    sizeof(struct videobuf_buffer), fh);
933
934	/* Set io allowed member of file handle to TRUE */
935	fh->io_allowed[index] = 1;
936	/* Increment io usrs member of channel object to 1 */
937	common->io_usrs = 1;
938	/* Store type of memory requested in channel object */
939	common->memory = reqbuf->memory;
940	INIT_LIST_HEAD(&common->dma_queue);
941
942	/* Allocate buffers */
943	ret = videobuf_reqbufs(&common->buffer_queue, reqbuf);
944
945reqbuf_exit:
946	mutex_unlock(&common->lock);
947	return ret;
948}
949
950/**
951 * vpif_querybuf() - query buffer handler
952 * @file: file ptr
953 * @priv: file handle
954 * @buf: v4l2 buffer structure ptr
955 */
956static int vpif_querybuf(struct file *file, void *priv,
957				struct v4l2_buffer *buf)
958{
959	struct vpif_fh *fh = priv;
960	struct channel_obj *ch = fh->channel;
961	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
962
963	vpif_dbg(2, debug, "vpif_querybuf\n");
964
965	if (common->fmt.type != buf->type)
966		return -EINVAL;
967
968	if (common->memory != V4L2_MEMORY_MMAP) {
969		vpif_dbg(1, debug, "Invalid memory\n");
970		return -EINVAL;
971	}
972
973	return videobuf_querybuf(&common->buffer_queue, buf);
974}
975
976/**
977 * vpif_qbuf() - query buffer handler
978 * @file: file ptr
979 * @priv: file handle
980 * @buf: v4l2 buffer structure ptr
981 */
982static int vpif_qbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
983{
984
985	struct vpif_fh *fh = priv;
986	struct channel_obj *ch = fh->channel;
987	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
988	struct v4l2_buffer tbuf = *buf;
989	struct videobuf_buffer *buf1;
990	unsigned long addr = 0;
991	unsigned long flags;
992	int ret = 0;
993
994	vpif_dbg(2, debug, "vpif_qbuf\n");
995
996	if (common->fmt.type != tbuf.type) {
997		vpif_err("invalid buffer type\n");
998		return -EINVAL;
999	}
1000
1001	if (!fh->io_allowed[VPIF_VIDEO_INDEX]) {
1002		vpif_err("fh io not allowed \n");
1003		return -EACCES;
1004	}
1005
1006	if (!(list_empty(&common->dma_queue)) ||
1007	    (common->cur_frm != common->next_frm) ||
1008	    !common->started ||
1009	    (common->started && (0 == ch->field_id)))
1010		return videobuf_qbuf(&common->buffer_queue, buf);
1011
1012	/* bufferqueue is empty store buffer address in VPIF registers */
1013	mutex_lock(&common->buffer_queue.vb_lock);
1014	buf1 = common->buffer_queue.bufs[tbuf.index];
1015
1016	if ((buf1->state == VIDEOBUF_QUEUED) ||
1017	    (buf1->state == VIDEOBUF_ACTIVE)) {
1018		vpif_err("invalid state\n");
1019		goto qbuf_exit;
1020	}
1021
1022	switch (buf1->memory) {
1023	case V4L2_MEMORY_MMAP:
1024		if (buf1->baddr == 0)
1025			goto qbuf_exit;
1026		break;
1027
1028	case V4L2_MEMORY_USERPTR:
1029		if (tbuf.length < buf1->bsize)
1030			goto qbuf_exit;
1031
1032		if ((VIDEOBUF_NEEDS_INIT != buf1->state)
1033			    && (buf1->baddr != tbuf.m.userptr))
1034			vpif_buffer_release(&common->buffer_queue, buf1);
1035			buf1->baddr = tbuf.m.userptr;
1036		break;
1037
1038	default:
1039		goto qbuf_exit;
1040	}
1041
1042	local_irq_save(flags);
1043	ret = vpif_buffer_prepare(&common->buffer_queue, buf1,
1044					common->buffer_queue.field);
1045	if (ret < 0) {
1046		local_irq_restore(flags);
1047		goto qbuf_exit;
1048	}
1049
1050	buf1->state = VIDEOBUF_ACTIVE;
1051
1052	if (V4L2_MEMORY_USERPTR == common->memory)
1053		addr = buf1->boff;
1054	else
1055		addr = videobuf_to_dma_contig(buf1);
1056
1057	common->next_frm = buf1;
1058	common->set_addr(addr + common->ytop_off,
1059			 addr + common->ybtm_off,
1060			 addr + common->ctop_off,
1061			 addr + common->cbtm_off);
1062
1063	local_irq_restore(flags);
1064	list_add_tail(&buf1->stream, &common->buffer_queue.stream);
1065	mutex_unlock(&common->buffer_queue.vb_lock);
1066	return 0;
1067
1068qbuf_exit:
1069	mutex_unlock(&common->buffer_queue.vb_lock);
1070	return -EINVAL;
1071}
1072
1073/**
1074 * vpif_dqbuf() - query buffer handler
1075 * @file: file ptr
1076 * @priv: file handle
1077 * @buf: v4l2 buffer structure ptr
1078 */
1079static int vpif_dqbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
1080{
1081	struct vpif_fh *fh = priv;
1082	struct channel_obj *ch = fh->channel;
1083	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
1084
1085	vpif_dbg(2, debug, "vpif_dqbuf\n");
1086
1087	return videobuf_dqbuf(&common->buffer_queue, buf,
1088					file->f_flags & O_NONBLOCK);
1089}
1090
1091/**
1092 * vpif_streamon() - streamon handler
1093 * @file: file ptr
1094 * @priv: file handle
1095 * @buftype: v4l2 buffer type
1096 */
1097static int vpif_streamon(struct file *file, void *priv,
1098				enum v4l2_buf_type buftype)
1099{
1100
1101	struct vpif_capture_config *config = vpif_dev->platform_data;
1102	struct vpif_fh *fh = priv;
1103	struct channel_obj *ch = fh->channel;
1104	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
1105	struct channel_obj *oth_ch = vpif_obj.dev[!ch->channel_id];
1106	struct vpif_params *vpif;
1107	unsigned long addr = 0;
1108	int ret = 0;
1109
1110	vpif_dbg(2, debug, "vpif_streamon\n");
1111
1112	vpif = &ch->vpifparams;
1113
1114	if (buftype != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
1115		vpif_dbg(1, debug, "buffer type not supported\n");
1116		return -EINVAL;
1117	}
1118
1119	/* If file handle is not allowed IO, return error */
1120	if (!fh->io_allowed[VPIF_VIDEO_INDEX]) {
1121		vpif_dbg(1, debug, "io not allowed\n");
1122		return -EACCES;
1123	}
1124
1125	/* If Streaming is already started, return error */
1126	if (common->started) {
1127		vpif_dbg(1, debug, "channel->started\n");
1128		return -EBUSY;
1129	}
1130
1131	if ((ch->channel_id == VPIF_CHANNEL0_VIDEO &&
1132	    oth_ch->common[VPIF_VIDEO_INDEX].started &&
1133	    vpif->std_info.ycmux_mode == 0) ||
1134	   ((ch->channel_id == VPIF_CHANNEL1_VIDEO) &&
1135	    (2 == oth_ch->common[VPIF_VIDEO_INDEX].started))) {
1136		vpif_dbg(1, debug, "other channel is being used\n");
1137		return -EBUSY;
1138	}
1139
1140	ret = vpif_check_format(ch, &common->fmt.fmt.pix, 0);
1141	if (ret)
1142		return ret;
1143
1144	/* Enable streamon on the sub device */
1145	ret = v4l2_subdev_call(vpif_obj.sd[ch->curr_sd_index], video,
1146				s_stream, 1);
1147
1148	if (ret && (ret != -ENOIOCTLCMD)) {
1149		vpif_dbg(1, debug, "stream on failed in subdev\n");
1150		return ret;
1151	}
1152
1153	/* Call videobuf_streamon to start streaming in videobuf */
1154	ret = videobuf_streamon(&common->buffer_queue);
1155	if (ret) {
1156		vpif_dbg(1, debug, "videobuf_streamon\n");
1157		return ret;
1158	}
1159
1160	if (mutex_lock_interruptible(&common->lock)) {
1161		ret = -ERESTARTSYS;
1162		goto streamoff_exit;
1163	}
1164
1165	/* If buffer queue is empty, return error */
1166	if (list_empty(&common->dma_queue)) {
1167		vpif_dbg(1, debug, "buffer queue is empty\n");
1168		ret = -EIO;
1169		goto exit;
1170	}
1171
1172	/* Get the next frame from the buffer queue */
1173	common->cur_frm = list_entry(common->dma_queue.next,
1174				    struct videobuf_buffer, queue);
1175	common->next_frm = common->cur_frm;
1176
1177	/* Remove buffer from the buffer queue */
1178	list_del(&common->cur_frm->queue);
1179	/* Mark state of the current frame to active */
1180	common->cur_frm->state = VIDEOBUF_ACTIVE;
1181	/* Initialize field_id and started member */
1182	ch->field_id = 0;
1183	common->started = 1;
1184
1185	if (V4L2_MEMORY_USERPTR == common->memory)
1186		addr = common->cur_frm->boff;
1187	else
1188		addr = videobuf_to_dma_contig(common->cur_frm);
1189
1190	/* Calculate the offset for Y and C data in the buffer */
1191	vpif_calculate_offsets(ch);
1192
1193	if ((vpif->std_info.frm_fmt &&
1194	    ((common->fmt.fmt.pix.field != V4L2_FIELD_NONE) &&
1195	     (common->fmt.fmt.pix.field != V4L2_FIELD_ANY))) ||
1196	    (!vpif->std_info.frm_fmt &&
1197	     (common->fmt.fmt.pix.field == V4L2_FIELD_NONE))) {
1198		vpif_dbg(1, debug, "conflict in field format and std format\n");
1199		ret = -EINVAL;
1200		goto exit;
1201	}
1202
1203	/* configure 1 or 2 channel mode */
1204	ret = config->setup_input_channel_mode(vpif->std_info.ycmux_mode);
1205
1206	if (ret < 0) {
1207		vpif_dbg(1, debug, "can't set vpif channel mode\n");
1208		goto exit;
1209	}
1210
1211	/* Call vpif_set_params function to set the parameters and addresses */
1212	ret = vpif_set_video_params(vpif, ch->channel_id);
1213
1214	if (ret < 0) {
1215		vpif_dbg(1, debug, "can't set video params\n");
1216		goto exit;
1217	}
1218
1219	common->started = ret;
1220	vpif_config_addr(ch, ret);
1221
1222	common->set_addr(addr + common->ytop_off,
1223			 addr + common->ybtm_off,
1224			 addr + common->ctop_off,
1225			 addr + common->cbtm_off);
1226
1227	/**
1228	 * Set interrupt for both the fields in VPIF Register enable channel in
1229	 * VPIF register
1230	 */
1231	if ((VPIF_CHANNEL0_VIDEO == ch->channel_id)) {
1232		channel0_intr_assert();
1233		channel0_intr_enable(1);
1234		enable_channel0(1);
1235	}
1236	if ((VPIF_CHANNEL1_VIDEO == ch->channel_id) ||
1237	    (common->started == 2)) {
1238		channel1_intr_assert();
1239		channel1_intr_enable(1);
1240		enable_channel1(1);
1241	}
1242	channel_first_int[VPIF_VIDEO_INDEX][ch->channel_id] = 1;
1243	mutex_unlock(&common->lock);
1244	return ret;
1245
1246exit:
1247	mutex_unlock(&common->lock);
1248streamoff_exit:
1249	ret = videobuf_streamoff(&common->buffer_queue);
1250	return ret;
1251}
1252
1253/**
1254 * vpif_streamoff() - streamoff handler
1255 * @file: file ptr
1256 * @priv: file handle
1257 * @buftype: v4l2 buffer type
1258 */
1259static int vpif_streamoff(struct file *file, void *priv,
1260				enum v4l2_buf_type buftype)
1261{
1262
1263	struct vpif_fh *fh = priv;
1264	struct channel_obj *ch = fh->channel;
1265	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
1266	int ret;
1267
1268	vpif_dbg(2, debug, "vpif_streamoff\n");
1269
1270	if (buftype != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
1271		vpif_dbg(1, debug, "buffer type not supported\n");
1272		return -EINVAL;
1273	}
1274
1275	/* If io is allowed for this file handle, return error */
1276	if (!fh->io_allowed[VPIF_VIDEO_INDEX]) {
1277		vpif_dbg(1, debug, "io not allowed\n");
1278		return -EACCES;
1279	}
1280
1281	/* If streaming is not started, return error */
1282	if (!common->started) {
1283		vpif_dbg(1, debug, "channel->started\n");
1284		return -EINVAL;
1285	}
1286
1287	if (mutex_lock_interruptible(&common->lock))
1288		return -ERESTARTSYS;
1289
1290	/* disable channel */
1291	if (VPIF_CHANNEL0_VIDEO == ch->channel_id) {
1292		enable_channel0(0);
1293		channel0_intr_enable(0);
1294	} else {
1295		enable_channel1(0);
1296		channel1_intr_enable(0);
1297	}
1298
1299	common->started = 0;
1300
1301	ret = v4l2_subdev_call(vpif_obj.sd[ch->curr_sd_index], video,
1302				s_stream, 0);
1303
1304	if (ret && (ret != -ENOIOCTLCMD))
1305		vpif_dbg(1, debug, "stream off failed in subdev\n");
1306
1307	mutex_unlock(&common->lock);
1308
1309	return videobuf_streamoff(&common->buffer_queue);
1310}
1311
1312/**
1313 * vpif_map_sub_device_to_input() - Maps sub device to input
1314 * @ch - ptr to channel
1315 * @config - ptr to capture configuration
1316 * @input_index - Given input index from application
1317 * @sub_device_index - index into sd table
1318 *
1319 * lookup the sub device information for a given input index.
1320 * we report all the inputs to application. inputs table also
1321 * has sub device name for the each input
1322 */
1323static struct vpif_subdev_info *vpif_map_sub_device_to_input(
1324				struct channel_obj *ch,
1325				struct vpif_capture_config *vpif_cfg,
1326				int input_index,
1327				int *sub_device_index)
1328{
1329	struct vpif_capture_chan_config *chan_cfg;
1330	struct vpif_subdev_info *subdev_info = NULL;
1331	const char *subdev_name = NULL;
1332	int i;
1333
1334	vpif_dbg(2, debug, "vpif_map_sub_device_to_input\n");
1335
1336	chan_cfg = &vpif_cfg->chan_config[ch->channel_id];
1337
1338	/**
1339	 * search through the inputs to find the sub device supporting
1340	 * the input
1341	 */
1342	for (i = 0; i < chan_cfg->input_count; i++) {
1343		/* For each sub device, loop through input */
1344		if (i == input_index) {
1345			subdev_name = chan_cfg->inputs[i].subdev_name;
1346			break;
1347		}
1348	}
1349
1350	/* if reached maximum. return null */
1351	if (i == chan_cfg->input_count || (NULL == subdev_name))
1352		return subdev_info;
1353
1354	/* loop through the sub device list to get the sub device info */
1355	for (i = 0; i < vpif_cfg->subdev_count; i++) {
1356		subdev_info = &vpif_cfg->subdev_info[i];
1357		if (!strcmp(subdev_info->name, subdev_name))
1358			break;
1359	}
1360
1361	if (i == vpif_cfg->subdev_count)
1362		return subdev_info;
1363
1364	/* check if the sub device is registered */
1365	if (NULL == vpif_obj.sd[i])
1366		return NULL;
1367
1368	*sub_device_index = i;
1369	return subdev_info;
1370}
1371
1372/**
1373 * vpif_querystd() - querystd handler
1374 * @file: file ptr
1375 * @priv: file handle
1376 * @std_id: ptr to std id
1377 *
1378 * This function is called to detect standard at the selected input
1379 */
1380static int vpif_querystd(struct file *file, void *priv, v4l2_std_id *std_id)
1381{
1382	struct vpif_fh *fh = priv;
1383	struct channel_obj *ch = fh->channel;
1384	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
1385	int ret = 0;
1386
1387	vpif_dbg(2, debug, "vpif_querystd\n");
1388
1389	if (mutex_lock_interruptible(&common->lock))
1390		return -ERESTARTSYS;
1391
1392	/* Call querystd function of decoder device */
1393	ret = v4l2_subdev_call(vpif_obj.sd[ch->curr_sd_index], video,
1394				querystd, std_id);
1395	if (ret < 0)
1396		vpif_dbg(1, debug, "Failed to set standard for sub devices\n");
1397
1398	mutex_unlock(&common->lock);
1399	return ret;
1400}
1401
1402/**
1403 * vpif_g_std() - get STD handler
1404 * @file: file ptr
1405 * @priv: file handle
1406 * @std_id: ptr to std id
1407 */
1408static int vpif_g_std(struct file *file, void *priv, v4l2_std_id *std)
1409{
1410	struct vpif_fh *fh = priv;
1411	struct channel_obj *ch = fh->channel;
1412
1413	vpif_dbg(2, debug, "vpif_g_std\n");
1414
1415	*std = ch->video.stdid;
1416	return 0;
1417}
1418
1419/**
1420 * vpif_s_std() - set STD handler
1421 * @file: file ptr
1422 * @priv: file handle
1423 * @std_id: ptr to std id
1424 */
1425static int vpif_s_std(struct file *file, void *priv, v4l2_std_id *std_id)
1426{
1427	struct vpif_fh *fh = priv;
1428	struct channel_obj *ch = fh->channel;
1429	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
1430	int ret = 0;
1431
1432	vpif_dbg(2, debug, "vpif_s_std\n");
1433
1434	if (common->started) {
1435		vpif_err("streaming in progress\n");
1436		return -EBUSY;
1437	}
1438
1439	if ((VPIF_CHANNEL0_VIDEO == ch->channel_id) ||
1440	    (VPIF_CHANNEL1_VIDEO == ch->channel_id)) {
1441		if (!fh->initialized) {
1442			vpif_dbg(1, debug, "Channel Busy\n");
1443			return -EBUSY;
1444		}
1445	}
1446
1447	ret = v4l2_prio_check(&ch->prio, fh->prio);
1448	if (0 != ret)
1449		return ret;
1450
1451	fh->initialized = 1;
1452
1453	/* Call encoder subdevice function to set the standard */
1454	if (mutex_lock_interruptible(&common->lock))
1455		return -ERESTARTSYS;
1456
1457	ch->video.stdid = *std_id;
1458
1459	/* Get the information about the standard */
1460	if (vpif_update_std_info(ch)) {
1461		ret = -EINVAL;
1462		vpif_err("Error getting the standard info\n");
1463		goto s_std_exit;
1464	}
1465
1466	/* Configure the default format information */
1467	vpif_config_format(ch);
1468
1469	/* set standard in the sub device */
1470	ret = v4l2_subdev_call(vpif_obj.sd[ch->curr_sd_index], core,
1471				s_std, *std_id);
1472	if (ret < 0)
1473		vpif_dbg(1, debug, "Failed to set standard for sub devices\n");
1474
1475s_std_exit:
1476	mutex_unlock(&common->lock);
1477	return ret;
1478}
1479
1480/**
1481 * vpif_enum_input() - ENUMINPUT handler
1482 * @file: file ptr
1483 * @priv: file handle
1484 * @input: ptr to input structure
1485 */
1486static int vpif_enum_input(struct file *file, void *priv,
1487				struct v4l2_input *input)
1488{
1489
1490	struct vpif_capture_config *config = vpif_dev->platform_data;
1491	struct vpif_capture_chan_config *chan_cfg;
1492	struct vpif_fh *fh = priv;
1493	struct channel_obj *ch = fh->channel;
1494
1495	chan_cfg = &config->chan_config[ch->channel_id];
1496
1497	if (input->index >= chan_cfg->input_count) {
1498		vpif_dbg(1, debug, "Invalid input index\n");
1499		return -EINVAL;
1500	}
1501
1502	memcpy(input, &chan_cfg->inputs[input->index].input,
1503		sizeof(*input));
1504	return 0;
1505}
1506
1507/**
1508 * vpif_g_input() - Get INPUT handler
1509 * @file: file ptr
1510 * @priv: file handle
1511 * @index: ptr to input index
1512 */
1513static int vpif_g_input(struct file *file, void *priv, unsigned int *index)
1514{
1515	struct vpif_fh *fh = priv;
1516	struct channel_obj *ch = fh->channel;
1517	struct video_obj *vid_ch = &ch->video;
1518
1519	*index = vid_ch->input_idx;
1520
1521	return 0;
1522}
1523
1524/**
1525 * vpif_s_input() - Set INPUT handler
1526 * @file: file ptr
1527 * @priv: file handle
1528 * @index: input index
1529 */
1530static int vpif_s_input(struct file *file, void *priv, unsigned int index)
1531{
1532	struct vpif_capture_config *config = vpif_dev->platform_data;
1533	struct vpif_capture_chan_config *chan_cfg;
1534	struct vpif_fh *fh = priv;
1535	struct channel_obj *ch = fh->channel;
1536	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
1537	struct video_obj *vid_ch = &ch->video;
1538	struct vpif_subdev_info *subdev_info;
1539	int ret = 0, sd_index = 0;
1540	u32 input = 0, output = 0;
1541
1542	chan_cfg = &config->chan_config[ch->channel_id];
1543
1544	if (common->started) {
1545		vpif_err("Streaming in progress\n");
1546		return -EBUSY;
1547	}
1548
1549	if ((VPIF_CHANNEL0_VIDEO == ch->channel_id) ||
1550	    (VPIF_CHANNEL1_VIDEO == ch->channel_id)) {
1551		if (!fh->initialized) {
1552			vpif_dbg(1, debug, "Channel Busy\n");
1553			return -EBUSY;
1554		}
1555	}
1556
1557	ret = v4l2_prio_check(&ch->prio, fh->prio);
1558	if (0 != ret)
1559		return ret;
1560
1561	fh->initialized = 1;
1562	subdev_info = vpif_map_sub_device_to_input(ch, config, index,
1563						   &sd_index);
1564	if (NULL == subdev_info) {
1565		vpif_dbg(1, debug,
1566			"couldn't lookup sub device for the input index\n");
1567		return -EINVAL;
1568	}
1569
1570	if (mutex_lock_interruptible(&common->lock))
1571		return -ERESTARTSYS;
1572
1573	/* first setup input path from sub device to vpif */
1574	if (config->setup_input_path) {
1575		ret = config->setup_input_path(ch->channel_id,
1576					       subdev_info->name);
1577		if (ret < 0) {
1578			vpif_dbg(1, debug, "couldn't setup input path for the"
1579				" sub device %s, for input index %d\n",
1580				subdev_info->name, index);
1581			goto exit;
1582		}
1583	}
1584
1585	if (subdev_info->can_route) {
1586		input = subdev_info->input;
1587		output = subdev_info->output;
1588		ret = v4l2_subdev_call(vpif_obj.sd[sd_index], video, s_routing,
1589					input, output, 0);
1590		if (ret < 0) {
1591			vpif_dbg(1, debug, "Failed to set input\n");
1592			goto exit;
1593		}
1594	}
1595	vid_ch->input_idx = index;
1596	ch->curr_subdev_info = subdev_info;
1597	ch->curr_sd_index = sd_index;
1598	/* copy interface parameters to vpif */
1599	ch->vpifparams.iface = subdev_info->vpif_if;
1600
1601	/* update tvnorms from the sub device input info */
1602	ch->video_dev->tvnorms = chan_cfg->inputs[index].input.std;
1603
1604exit:
1605	mutex_unlock(&common->lock);
1606	return ret;
1607}
1608
1609/**
1610 * vpif_enum_fmt_vid_cap() - ENUM_FMT handler
1611 * @file: file ptr
1612 * @priv: file handle
1613 * @index: input index
1614 */
1615static int vpif_enum_fmt_vid_cap(struct file *file, void  *priv,
1616					struct v4l2_fmtdesc *fmt)
1617{
1618	struct vpif_fh *fh = priv;
1619	struct channel_obj *ch = fh->channel;
1620
1621	if (fmt->index != 0) {
1622		vpif_dbg(1, debug, "Invalid format index\n");
1623		return -EINVAL;
1624	}
1625
1626	/* Fill in the information about format */
1627	if (ch->vpifparams.iface.if_type == VPIF_IF_RAW_BAYER) {
1628		fmt->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1629		strcpy(fmt->description, "Raw Mode -Bayer Pattern GrRBGb");
1630		fmt->pixelformat = V4L2_PIX_FMT_SBGGR8;
1631	} else {
1632		fmt->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1633		strcpy(fmt->description, "YCbCr4:2:2 YC Planar");
1634		fmt->pixelformat = V4L2_PIX_FMT_YUV422P;
1635	}
1636	return 0;
1637}
1638
1639/**
1640 * vpif_try_fmt_vid_cap() - TRY_FMT handler
1641 * @file: file ptr
1642 * @priv: file handle
1643 * @fmt: ptr to v4l2 format structure
1644 */
1645static int vpif_try_fmt_vid_cap(struct file *file, void *priv,
1646				struct v4l2_format *fmt)
1647{
1648	struct vpif_fh *fh = priv;
1649	struct channel_obj *ch = fh->channel;
1650	struct v4l2_pix_format *pixfmt = &fmt->fmt.pix;
1651
1652	return vpif_check_format(ch, pixfmt, 1);
1653}
1654
1655
1656/**
1657 * vpif_g_fmt_vid_cap() - Set INPUT handler
1658 * @file: file ptr
1659 * @priv: file handle
1660 * @fmt: ptr to v4l2 format structure
1661 */
1662static int vpif_g_fmt_vid_cap(struct file *file, void *priv,
1663				struct v4l2_format *fmt)
1664{
1665	struct vpif_fh *fh = priv;
1666	struct channel_obj *ch = fh->channel;
1667	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
1668
1669	/* Check the validity of the buffer type */
1670	if (common->fmt.type != fmt->type)
1671		return -EINVAL;
1672
1673	/* Fill in the information about format */
1674	if (mutex_lock_interruptible(&common->lock))
1675		return -ERESTARTSYS;
1676
1677	*fmt = common->fmt;
1678	mutex_unlock(&common->lock);
1679	return 0;
1680}
1681
1682/**
1683 * vpif_s_fmt_vid_cap() - Set FMT handler
1684 * @file: file ptr
1685 * @priv: file handle
1686 * @fmt: ptr to v4l2 format structure
1687 */
1688static int vpif_s_fmt_vid_cap(struct file *file, void *priv,
1689				struct v4l2_format *fmt)
1690{
1691	struct vpif_fh *fh = priv;
1692	struct channel_obj *ch = fh->channel;
1693	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
1694	struct v4l2_pix_format *pixfmt;
1695	int ret = 0;
1696
1697	vpif_dbg(2, debug, "VIDIOC_S_FMT\n");
1698
1699	/* If streaming is started, return error */
1700	if (common->started) {
1701		vpif_dbg(1, debug, "Streaming is started\n");
1702		return -EBUSY;
1703	}
1704
1705	if ((VPIF_CHANNEL0_VIDEO == ch->channel_id) ||
1706	    (VPIF_CHANNEL1_VIDEO == ch->channel_id)) {
1707		if (!fh->initialized) {
1708			vpif_dbg(1, debug, "Channel Busy\n");
1709			return -EBUSY;
1710		}
1711	}
1712
1713	ret = v4l2_prio_check(&ch->prio, fh->prio);
1714	if (0 != ret)
1715		return ret;
1716
1717	fh->initialized = 1;
1718
1719	pixfmt = &fmt->fmt.pix;
1720	/* Check for valid field format */
1721	ret = vpif_check_format(ch, pixfmt, 0);
1722
1723	if (ret)
1724		return ret;
1725	/* store the format in the channel object */
1726	if (mutex_lock_interruptible(&common->lock))
1727		return -ERESTARTSYS;
1728
1729	common->fmt = *fmt;
1730	mutex_unlock(&common->lock);
1731
1732	return 0;
1733}
1734
1735/**
1736 * vpif_querycap() - QUERYCAP handler
1737 * @file: file ptr
1738 * @priv: file handle
1739 * @cap: ptr to v4l2_capability structure
1740 */
1741static int vpif_querycap(struct file *file, void  *priv,
1742				struct v4l2_capability *cap)
1743{
1744	struct vpif_capture_config *config = vpif_dev->platform_data;
1745
1746	cap->version = VPIF_CAPTURE_VERSION_CODE;
1747	cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1748	strlcpy(cap->driver, "vpif capture", sizeof(cap->driver));
1749	strlcpy(cap->bus_info, "DM646x Platform", sizeof(cap->bus_info));
1750	strlcpy(cap->card, config->card_name, sizeof(cap->card));
1751
1752	return 0;
1753}
1754
1755/**
1756 * vpif_g_priority() - get priority handler
1757 * @file: file ptr
1758 * @priv: file handle
1759 * @prio: ptr to v4l2_priority structure
1760 */
1761static int vpif_g_priority(struct file *file, void *priv,
1762			   enum v4l2_priority *prio)
1763{
1764	struct vpif_fh *fh = priv;
1765	struct channel_obj *ch = fh->channel;
1766
1767	*prio = v4l2_prio_max(&ch->prio);
1768
1769	return 0;
1770}
1771
1772/**
1773 * vpif_s_priority() - set priority handler
1774 * @file: file ptr
1775 * @priv: file handle
1776 * @prio: ptr to v4l2_priority structure
1777 */
1778static int vpif_s_priority(struct file *file, void *priv, enum v4l2_priority p)
1779{
1780	struct vpif_fh *fh = priv;
1781	struct channel_obj *ch = fh->channel;
1782
1783	return v4l2_prio_change(&ch->prio, &fh->prio, p);
1784}
1785
1786/**
1787 * vpif_cropcap() - cropcap handler
1788 * @file: file ptr
1789 * @priv: file handle
1790 * @crop: ptr to v4l2_cropcap structure
1791 */
1792static int vpif_cropcap(struct file *file, void *priv,
1793			struct v4l2_cropcap *crop)
1794{
1795	struct vpif_fh *fh = priv;
1796	struct channel_obj *ch = fh->channel;
1797	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
1798
1799	if (V4L2_BUF_TYPE_VIDEO_CAPTURE != crop->type)
1800		return -EINVAL;
1801
1802	crop->bounds.left = 0;
1803	crop->bounds.top = 0;
1804	crop->bounds.height = common->height;
1805	crop->bounds.width = common->width;
1806	crop->defrect = crop->bounds;
1807	return 0;
1808}
1809
1810/* vpif capture ioctl operations */
1811static const struct v4l2_ioctl_ops vpif_ioctl_ops = {
1812	.vidioc_querycap        	= vpif_querycap,
1813	.vidioc_g_priority		= vpif_g_priority,
1814	.vidioc_s_priority		= vpif_s_priority,
1815	.vidioc_enum_fmt_vid_cap	= vpif_enum_fmt_vid_cap,
1816	.vidioc_g_fmt_vid_cap  		= vpif_g_fmt_vid_cap,
1817	.vidioc_s_fmt_vid_cap		= vpif_s_fmt_vid_cap,
1818	.vidioc_try_fmt_vid_cap		= vpif_try_fmt_vid_cap,
1819	.vidioc_enum_input		= vpif_enum_input,
1820	.vidioc_s_input			= vpif_s_input,
1821	.vidioc_g_input			= vpif_g_input,
1822	.vidioc_reqbufs         	= vpif_reqbufs,
1823	.vidioc_querybuf        	= vpif_querybuf,
1824	.vidioc_querystd		= vpif_querystd,
1825	.vidioc_s_std           	= vpif_s_std,
1826	.vidioc_g_std			= vpif_g_std,
1827	.vidioc_qbuf            	= vpif_qbuf,
1828	.vidioc_dqbuf           	= vpif_dqbuf,
1829	.vidioc_streamon        	= vpif_streamon,
1830	.vidioc_streamoff       	= vpif_streamoff,
1831	.vidioc_cropcap         	= vpif_cropcap,
1832};
1833
1834/* vpif file operations */
1835static struct v4l2_file_operations vpif_fops = {
1836	.owner = THIS_MODULE,
1837	.open = vpif_open,
1838	.release = vpif_release,
1839	.ioctl = video_ioctl2,
1840	.mmap = vpif_mmap,
1841	.poll = vpif_poll
1842};
1843
1844/* vpif video template */
1845static struct video_device vpif_video_template = {
1846	.name		= "vpif",
1847	.fops		= &vpif_fops,
1848	.minor		= -1,
1849	.ioctl_ops	= &vpif_ioctl_ops,
1850};
1851
1852/**
1853 * initialize_vpif() - Initialize vpif data structures
1854 *
1855 * Allocate memory for data structures and initialize them
1856 */
1857static int initialize_vpif(void)
1858{
1859	int err = 0, i, j;
1860	int free_channel_objects_index;
1861
1862	/* Default number of buffers should be 3 */
1863	if ((ch0_numbuffers > 0) &&
1864	    (ch0_numbuffers < config_params.min_numbuffers))
1865		ch0_numbuffers = config_params.min_numbuffers;
1866	if ((ch1_numbuffers > 0) &&
1867	    (ch1_numbuffers < config_params.min_numbuffers))
1868		ch1_numbuffers = config_params.min_numbuffers;
1869
1870	/* Set buffer size to min buffers size if it is invalid */
1871	if (ch0_bufsize < config_params.min_bufsize[VPIF_CHANNEL0_VIDEO])
1872		ch0_bufsize =
1873		    config_params.min_bufsize[VPIF_CHANNEL0_VIDEO];
1874	if (ch1_bufsize < config_params.min_bufsize[VPIF_CHANNEL1_VIDEO])
1875		ch1_bufsize =
1876		    config_params.min_bufsize[VPIF_CHANNEL1_VIDEO];
1877
1878	config_params.numbuffers[VPIF_CHANNEL0_VIDEO] = ch0_numbuffers;
1879	config_params.numbuffers[VPIF_CHANNEL1_VIDEO] = ch1_numbuffers;
1880	if (ch0_numbuffers) {
1881		config_params.channel_bufsize[VPIF_CHANNEL0_VIDEO]
1882		    = ch0_bufsize;
1883	}
1884	if (ch1_numbuffers) {
1885		config_params.channel_bufsize[VPIF_CHANNEL1_VIDEO]
1886		    = ch1_bufsize;
1887	}
1888
1889	/* Allocate memory for six channel objects */
1890	for (i = 0; i < VPIF_CAPTURE_MAX_DEVICES; i++) {
1891		vpif_obj.dev[i] =
1892		    kzalloc(sizeof(*vpif_obj.dev[i]), GFP_KERNEL);
1893		/* If memory allocation fails, return error */
1894		if (!vpif_obj.dev[i]) {
1895			free_channel_objects_index = i;
1896			err = -ENOMEM;
1897			goto vpif_init_free_channel_objects;
1898		}
1899	}
1900	return 0;
1901
1902vpif_init_free_channel_objects:
1903	for (j = 0; j < free_channel_objects_index; j++)
1904		kfree(vpif_obj.dev[j]);
1905	return err;
1906}
1907
1908/**
1909 * vpif_probe : This function probes the vpif capture driver
1910 * @pdev: platform device pointer
1911 *
1912 * This creates device entries by register itself to the V4L2 driver and
1913 * initializes fields of each channel objects
1914 */
1915static __init int vpif_probe(struct platform_device *pdev)
1916{
1917	struct vpif_subdev_info *subdevdata;
1918	struct vpif_capture_config *config;
1919	int i, j, k, m, q, err;
1920	struct i2c_adapter *i2c_adap;
1921	struct channel_obj *ch;
1922	struct common_obj *common;
1923	struct video_device *vfd;
1924	struct resource *res;
1925	int subdev_count;
1926
1927	vpif_dev = &pdev->dev;
1928
1929	err = initialize_vpif();
1930	if (err) {
1931		v4l2_err(vpif_dev->driver, "Error initializing vpif\n");
1932		return err;
1933	}
1934
1935	k = 0;
1936	while ((res = platform_get_resource(pdev, IORESOURCE_IRQ, k))) {
1937		for (i = res->start; i <= res->end; i++) {
1938			if (request_irq(i, vpif_channel_isr, IRQF_DISABLED,
1939					"DM646x_Capture",
1940				(void *)(&vpif_obj.dev[k]->channel_id))) {
1941				err = -EBUSY;
1942				i--;
1943				goto vpif_int_err;
1944			}
1945		}
1946		k++;
1947	}
1948
1949	for (i = 0; i < VPIF_CAPTURE_MAX_DEVICES; i++) {
1950		/* Get the pointer to the channel object */
1951		ch = vpif_obj.dev[i];
1952		/* Allocate memory for video device */
1953		vfd = video_device_alloc();
1954		if (NULL == vfd) {
1955			for (j = 0; j < i; j++) {
1956				ch = vpif_obj.dev[j];
1957				video_device_release(ch->video_dev);
1958			}
1959			err = -ENOMEM;
1960			goto vpif_dev_alloc_err;
1961		}
1962
1963		/* Initialize field of video device */
1964		*vfd = vpif_video_template;
1965		vfd->v4l2_dev = &vpif_obj.v4l2_dev;
1966		vfd->release = video_device_release;
1967		snprintf(vfd->name, sizeof(vfd->name),
1968			 "DM646x_VPIFCapture_DRIVER_V%d.%d.%d",
1969			 (VPIF_CAPTURE_VERSION_CODE >> 16) & 0xff,
1970			 (VPIF_CAPTURE_VERSION_CODE >> 8) & 0xff,
1971			 (VPIF_CAPTURE_VERSION_CODE) & 0xff);
1972		/* Set video_dev to the video device */
1973		ch->video_dev = vfd;
1974	}
1975
1976	for (j = 0; j < VPIF_CAPTURE_MAX_DEVICES; j++) {
1977		ch = vpif_obj.dev[j];
1978		ch->channel_id = j;
1979		common = &(ch->common[VPIF_VIDEO_INDEX]);
1980		spin_lock_init(&common->irqlock);
1981		mutex_init(&common->lock);
1982		/* Initialize prio member of channel object */
1983		v4l2_prio_init(&ch->prio);
1984		err = video_register_device(ch->video_dev,
1985					    VFL_TYPE_GRABBER, (j ? 1 : 0));
1986		if (err)
1987			goto probe_out;
1988
1989		video_set_drvdata(ch->video_dev, ch);
1990
1991	}
1992
1993	i2c_adap = i2c_get_adapter(1);
1994	config = pdev->dev.platform_data;
1995
1996	subdev_count = config->subdev_count;
1997	vpif_obj.sd = kmalloc(sizeof(struct v4l2_subdev *) * subdev_count,
1998				GFP_KERNEL);
1999	if (vpif_obj.sd == NULL) {
2000		vpif_err("unable to allocate memory for subdevice pointers\n");
2001		err = -ENOMEM;
2002		goto probe_out;
2003	}
2004
2005	err = v4l2_device_register(vpif_dev, &vpif_obj.v4l2_dev);
2006	if (err) {
2007		v4l2_err(vpif_dev->driver, "Error registering v4l2 device\n");
2008		goto probe_subdev_out;
2009	}
2010
2011	for (i = 0; i < subdev_count; i++) {
2012		subdevdata = &config->subdev_info[i];
2013		vpif_obj.sd[i] =
2014			v4l2_i2c_new_subdev_board(&vpif_obj.v4l2_dev,
2015						  i2c_adap,
2016						  subdevdata->name,
2017						  &subdevdata->board_info,
2018						  NULL);
2019
2020		if (!vpif_obj.sd[i]) {
2021			vpif_err("Error registering v4l2 subdevice\n");
2022			goto probe_subdev_out;
2023		}
2024		v4l2_info(&vpif_obj.v4l2_dev, "registered sub device %s\n",
2025			  subdevdata->name);
2026
2027		if (vpif_obj.sd[i])
2028			vpif_obj.sd[i]->grp_id = 1 << i;
2029	}
2030	v4l2_info(&vpif_obj.v4l2_dev, "DM646x VPIF Capture driver"
2031		  " initialized\n");
2032
2033	return 0;
2034
2035probe_subdev_out:
2036	/* free sub devices memory */
2037	kfree(vpif_obj.sd);
2038
2039	j = VPIF_CAPTURE_MAX_DEVICES;
2040probe_out:
2041	v4l2_device_unregister(&vpif_obj.v4l2_dev);
2042	for (k = 0; k < j; k++) {
2043		/* Get the pointer to the channel object */
2044		ch = vpif_obj.dev[k];
2045		/* Unregister video device */
2046		video_unregister_device(ch->video_dev);
2047	}
2048
2049vpif_dev_alloc_err:
2050	k = VPIF_CAPTURE_MAX_DEVICES-1;
2051	res = platform_get_resource(pdev, IORESOURCE_IRQ, k);
2052	i = res->end;
2053
2054vpif_int_err:
2055	for (q = k; q >= 0; q--) {
2056		for (m = i; m >= (int)res->start; m--)
2057			free_irq(m, (void *)(&vpif_obj.dev[q]->channel_id));
2058
2059		res = platform_get_resource(pdev, IORESOURCE_IRQ, q-1);
2060		if (res)
2061			i = res->end;
2062	}
2063	return err;
2064}
2065
2066/**
2067 * vpif_remove() - driver remove handler
2068 * @device: ptr to platform device structure
2069 *
2070 * The vidoe device is unregistered
2071 */
2072static int vpif_remove(struct platform_device *device)
2073{
2074	int i;
2075	struct channel_obj *ch;
2076
2077	v4l2_device_unregister(&vpif_obj.v4l2_dev);
2078
2079	/* un-register device */
2080	for (i = 0; i < VPIF_CAPTURE_MAX_DEVICES; i++) {
2081		/* Get the pointer to the channel object */
2082		ch = vpif_obj.dev[i];
2083		/* Unregister video device */
2084		video_unregister_device(ch->video_dev);
2085	}
2086	return 0;
2087}
2088
2089/**
2090 * vpif_suspend: vpif device suspend
2091 *
2092 * TODO: Add suspend code here
2093 */
2094static int
2095vpif_suspend(struct device *dev)
2096{
2097	return -1;
2098}
2099
2100/**
2101 * vpif_resume: vpif device suspend
2102 *
2103 * TODO: Add resume code here
2104 */
2105static int
2106vpif_resume(struct device *dev)
2107{
2108	return -1;
2109}
2110
2111static const struct dev_pm_ops vpif_dev_pm_ops = {
2112	.suspend = vpif_suspend,
2113	.resume = vpif_resume,
2114};
2115
2116static struct platform_driver vpif_driver = {
2117	.driver	= {
2118		.name	= "vpif_capture",
2119		.owner	= THIS_MODULE,
2120		.pm = &vpif_dev_pm_ops,
2121	},
2122	.probe = vpif_probe,
2123	.remove = vpif_remove,
2124};
2125
2126/**
2127 * vpif_init: initialize the vpif driver
2128 *
2129 * This function registers device and driver to the kernel, requests irq
2130 * handler and allocates memory
2131 * for channel objects
2132 */
2133static __init int vpif_init(void)
2134{
2135	return platform_driver_register(&vpif_driver);
2136}
2137
2138/**
2139 * vpif_cleanup : This function clean up the vpif capture resources
2140 *
2141 * This will un-registers device and driver to the kernel, frees
2142 * requested irq handler and de-allocates memory allocated for channel
2143 * objects.
2144 */
2145static void vpif_cleanup(void)
2146{
2147	struct platform_device *pdev;
2148	struct resource *res;
2149	int irq_num;
2150	int i = 0;
2151
2152	pdev = container_of(vpif_dev, struct platform_device, dev);
2153	while ((res = platform_get_resource(pdev, IORESOURCE_IRQ, i))) {
2154		for (irq_num = res->start; irq_num <= res->end; irq_num++)
2155			free_irq(irq_num,
2156				 (void *)(&vpif_obj.dev[i]->channel_id));
2157		i++;
2158	}
2159
2160	platform_driver_unregister(&vpif_driver);
2161
2162	kfree(vpif_obj.sd);
2163	for (i = 0; i < VPIF_CAPTURE_MAX_DEVICES; i++)
2164		kfree(vpif_obj.dev[i]);
2165}
2166
2167/* Function for module initialization and cleanup */
2168module_init(vpif_init);
2169module_exit(vpif_cleanup);
2170