V4L/DVB (6950): Lindent em28xx-audio.c

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 197 insertions, 176 deletions

diff --git a/drivers/media/video/em28xx/em28xx-audio.c b/drivers/media/video/em28xx/em28xx-audio.c
index e1e1eda517a..c631cac4c5d 100644
--- a/drivers/media/video/em28xx/em28xx-audio.c
+++ b/drivers/media/video/em28xx/em28xx-audio.c
@@ -44,37 +44,39 @@
 #include "em28xx.h"
 
 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
-static int em28xx_cmd(struct em28xx *dev, int cmd,int arg);
+static int em28xx_cmd(struct em28xx *dev, int cmd, int arg);
 
-
-static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, size_t size)
+static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
+					size_t size)
 {
 	struct snd_pcm_runtime *runtime = subs->runtime;
-	if(runtime->dma_area){
-		if(runtime->dma_bytes > size)
+	if (runtime->dma_area) {
+		if (runtime->dma_bytes > size)
 			return 0;
 		vfree(runtime->dma_area);
 	}
 	runtime->dma_area = vmalloc(size);
-	if(!runtime ->dma_area)
+	if (!runtime->dma_area)
 		return -ENOMEM;
 	runtime->dma_bytes = size;
 	return 0;
 }
 
 static struct snd_pcm_hardware snd_em28xx_hw_capture = {
-	.info = SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED  | SNDRV_PCM_INFO_MMAP_VALID,
+	.info =
+	    SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP |
+	    SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP_VALID,
 	.formats = SNDRV_PCM_FMTBIT_S16_LE,
 	.rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
 	.rate_min = 48000,
 	.rate_max = 48000,
 	.channels_min = 2,
 	.channels_max = 2,
-	.buffer_bytes_max = 62720*8, /* just about the value in usbaudio.c */
-	.period_bytes_min = 64, //12544/2,
+	.buffer_bytes_max = 62720 * 8,	/* just about the value in usbaudio.c */
+	.period_bytes_min = 64,	//12544/2,
 	.period_bytes_max = 12544,
 	.periods_min = 2,
-	.periods_max = 98, //12544,
+	.periods_max = 98,	//12544,
 };
 
 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
@@ -84,66 +86,68 @@ static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
 	struct em28xx *dev = snd_pcm_substream_chip(substream);
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	printk("opening radio device and trying to acquire exclusive lock\n");
-        switch(dev->mode){
-                case TUNER_STUB_DVBC_TV:
-                case TUNER_STUB_DVBT_TV:
-                case TUNER_STUB_ATSC_TV:
-			/* digital has no support for analog audio */
-			if (ret != 0 ) {
-				printk("device is already in use by DVB-T\n");
-				return -EINVAL;
-			} else {
-				struct v4l2_tuner tuner;
-				printk("switching device to FM mode\n");
-
-				mode = TUNER_STUB_RADIO;
-				memset(&tuner, 0x0, sizeof(struct v4l2_tuner));
-				tuner.type = V4L2_TUNER_RADIO;
-
-				/* enable GPIO for analog TV */
-				dev->em28xx_gpio_control(dev,  EM28XX_MODE, (void*)mode);
-				dev->mode = mode;
-				/* upload firmware */
-				tuner_run_cmd(dev->tobj, TUNER_CMD_INIT, (void*)mode);
-
-				/* required for devices which have kerneldriver dependencies */
-//				em28xx_config(dev);
-//				em28xx_config_i2c(dev);
-
-				/* this is moreover to switch the decoder to FM */
-				em28xx_i2c_call_clients(dev, VIDIOC_S_TUNER, &tuner);
-
-				dev->em28xx_write_regs(dev, 0x0f, "\x87", 1); 
-				ret = dev->em28xx_acquire(dev, EM28XX_RADIO, 1); 
-				em28xx_i2c_call_clients(dev, VIDIOC_INT_RESET, 0);
-				/* TODO switch to FM mode */
-
-				printk("em28xx-audio: %d mode\n", mode);
-				tuner_run_cmd(dev->tobj, TUNER_CMD_G_MODE, &mode);
-				printk("retrieved mode from tuner: %d\n",mode);
-			}
-			break;
-
-                case TUNER_STUB_ANALOG_TV:
-			printk("em28xx-audio: device is currently in analog TV mode\n");
-			/* unmute by default */
-			dev->em28xx_write_regs(dev, 0x0f, "\x87", 1); 
-			break;
-                case TUNER_STUB_RADIO:
-			/* check current mode and put a hard lock onto it */
-			printk("em28xx-audio: device is currently in analogue FM mode\n");
-			/* unmute by default here */
-			dev->em28xx_write_regs(dev, 0x0f, "\x87", 1); 
-			ret = dev->em28xx_acquire(dev, EM28XX_RADIO, 1); 
-			if ( ret == 0 ) 
-				printk("device is locked in fmradio mode now\n");
-			break;
-		default:
-			printk("em28xx-audio: unhandled mode %d\n", dev->mode);
+	switch (dev->mode) {
+	case TUNER_STUB_DVBC_TV:
+	case TUNER_STUB_DVBT_TV:
+	case TUNER_STUB_ATSC_TV:
+		/* digital has no support for analog audio */
+		if (ret != 0) {
+			printk("device is already in use by DVB-T\n");
+			return -EINVAL;
+		} else {
+			struct v4l2_tuner tuner;
+			printk("switching device to FM mode\n");
+
+			mode = TUNER_STUB_RADIO;
+			memset(&tuner, 0x0, sizeof(struct v4l2_tuner));
+			tuner.type = V4L2_TUNER_RADIO;
+
+			/* enable GPIO for analog TV */
+			dev->em28xx_gpio_control(dev, EM28XX_MODE,
+						 (void *)mode);
+			dev->mode = mode;
+			/* upload firmware */
+			tuner_run_cmd(dev->tobj, TUNER_CMD_INIT, (void *)mode);
+
+			/* required for devices which have kerneldriver dependencies */
+//                              em28xx_config(dev);
+//                              em28xx_config_i2c(dev);
+
+			/* this is moreover to switch the decoder to FM */
+			em28xx_i2c_call_clients(dev, VIDIOC_S_TUNER, &tuner);
+
+			dev->em28xx_write_regs(dev, 0x0f, "\x87", 1);
+			ret = dev->em28xx_acquire(dev, EM28XX_RADIO, 1);
+			em28xx_i2c_call_clients(dev, VIDIOC_INT_RESET, 0);
+			/* TODO switch to FM mode */
+
+			printk("em28xx-audio: %d mode\n", mode);
+			tuner_run_cmd(dev->tobj, TUNER_CMD_G_MODE, &mode);
+			printk("retrieved mode from tuner: %d\n", mode);
+		}
+		break;
+
+	case TUNER_STUB_ANALOG_TV:
+		printk("em28xx-audio: device is currently in analog TV mode\n");
+		/* unmute by default */
+		dev->em28xx_write_regs(dev, 0x0f, "\x87", 1);
+		break;
+	case TUNER_STUB_RADIO:
+		/* check current mode and put a hard lock onto it */
+		printk
+		    ("em28xx-audio: device is currently in analogue FM mode\n");
+		/* unmute by default here */
+		dev->em28xx_write_regs(dev, 0x0f, "\x87", 1);
+		ret = dev->em28xx_acquire(dev, EM28XX_RADIO, 1);
+		if (ret == 0)
+			printk("device is locked in fmradio mode now\n");
+		break;
+	default:
+		printk("em28xx-audio: unhandled mode %d\n", dev->mode);
 	}
 
 	runtime->hw = snd_em28xx_hw_capture;
-	if(dev->alt == 0 && dev->adev->users == 0 ) {
+	if (dev->alt == 0 && dev->adev->users == 0) {
 		int errCode;
 		dev->alt = 7;
 		errCode = usb_set_interface(dev->udev, 0, 7);
@@ -163,48 +167,51 @@ static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
 	dev->adev->users--;
 
 	/* decrease audio reference */
-	switch(dev->mode) {
-		case TUNER_STUB_ANALOG_TV:
-			amode = EM28XX_VIDEO;
-			break;
-		case TUNER_STUB_RADIO:
-			amode = EM28XX_RADIO;
-			break;
-		default:
-			printk("invalid mode: %d\n",dev->mode);
-			break;
+	switch (dev->mode) {
+	case TUNER_STUB_ANALOG_TV:
+		amode = EM28XX_VIDEO;
+		break;
+	case TUNER_STUB_RADIO:
+		amode = EM28XX_RADIO;
+		break;
+	default:
+		printk("invalid mode: %d\n", dev->mode);
+		break;
 	}
 
-	dev->em28xx_acquire(dev, amode, 0); 
+	dev->em28xx_acquire(dev, amode, 0);
 
-	if(dev->adev->users == 0 && dev->adev->shutdown == 1) {
-		printk("audio users: %d\n",dev->adev->users);
+	if (dev->adev->users == 0 && dev->adev->shutdown == 1) {
+		printk("audio users: %d\n", dev->adev->users);
 		printk("disabling audio stream!\n");
 		dev->adev->shutdown = 0;
 		printk("released lock\n");
-		em28xx_cmd(dev,EM28XX_CAPTURE_STREAM_EN,0);
+		em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
 	}
 	return 0;
 }
 
-static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params)
+static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
+					struct snd_pcm_hw_params *hw_params)
 {
 	unsigned int channels, rate, format;
 	int ret;
-	ret = snd_pcm_alloc_vmalloc_buffer(substream, params_buffer_bytes(hw_params));
+	ret =
+	    snd_pcm_alloc_vmalloc_buffer(substream,
+					 params_buffer_bytes(hw_params));
 	format = params_format(hw_params);
 	rate = params_rate(hw_params);
 	channels = params_channels(hw_params);
 	/* TODO: set up em28xx audio chip to deliver the correct audio format, current default is 48000hz multiplexed => 96000hz mono
-	   which shouldn't matter since analogue TV only supports mono*/
+	   which shouldn't matter since analogue TV only supports mono */
 	return 0;
 }
 
 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
 {
 	struct em28xx *dev = snd_pcm_substream_chip(substream);
-	if(dev->adev->capture_stream==STREAM_ON){
-		em28xx_cmd(dev,EM28XX_CAPTURE_STREAM_EN,0);
+	if (dev->adev->capture_stream == STREAM_ON) {
+		em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
 	}
 	return 0;
 }
@@ -214,24 +221,25 @@ static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
 	return 0;
 }
 
-static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream, int cmd)
+static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
+				      int cmd)
 {
 	struct em28xx *dev = snd_pcm_substream_chip(substream);
-	switch(cmd){
-		case SNDRV_PCM_TRIGGER_START:
-			em28xx_cmd(dev,EM28XX_CAPTURE_STREAM_EN,1);
-			return 0;
-		case SNDRV_PCM_TRIGGER_STOP:
-			dev->adev->shutdown=1;
-			return 0;
-		default:
-			return -EINVAL;
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 1);
+		return 0;
+	case SNDRV_PCM_TRIGGER_STOP:
+		dev->adev->shutdown = 1;
+		return 0;
+	default:
+		return -EINVAL;
 	}
 }
 
 static void em28xx_audio_isocirq(struct urb *urb)
 {
-	struct em28xx *dev=urb->context;
+	struct em28xx *dev = urb->context;
 	int i;
 	unsigned int oldptr;
 	unsigned long flags;
@@ -241,50 +249,61 @@ static void em28xx_audio_isocirq(struct urb *urb)
 	unsigned int stride;
 	struct snd_pcm_substream *substream;
 	struct snd_pcm_runtime *runtime;
-	if(dev->adev->capture_pcm_substream){
-		substream=dev->adev->capture_pcm_substream;
-		runtime=substream->runtime;
+	if (dev->adev->capture_pcm_substream) {
+		substream = dev->adev->capture_pcm_substream;
+		runtime = substream->runtime;
 
 		stride = runtime->frame_bits >> 3;
-		for(i=0;i<urb->number_of_packets;i++){
-			int length=urb->iso_frame_desc[i].actual_length/stride;
-			cp=(unsigned char *) urb->transfer_buffer + urb->iso_frame_desc[i].offset;
+		for (i = 0; i < urb->number_of_packets; i++) {
+			int length =
+			    urb->iso_frame_desc[i].actual_length / stride;
+			cp = (unsigned char *)urb->transfer_buffer +
+			    urb->iso_frame_desc[i].offset;
 
-			if(!length)
+			if (!length)
 				continue;
 
 			spin_lock_irqsave(&dev->adev->slock, flags);
 			oldptr = dev->adev->hwptr_done_capture;
-			dev->adev->hwptr_done_capture +=length;
-			if(dev->adev->hwptr_done_capture >= runtime->buffer_size)
-				dev->adev->hwptr_done_capture -= runtime->buffer_size;
+			dev->adev->hwptr_done_capture += length;
+			if (dev->adev->hwptr_done_capture >=
+			    runtime->buffer_size)
+				dev->adev->hwptr_done_capture -=
+				    runtime->buffer_size;
 
 			dev->adev->capture_transfer_done += length;
-			if(dev->adev->capture_transfer_done >= runtime->period_size){
-				dev->adev->capture_transfer_done -= runtime->period_size;
-				period_elapsed=1;
+			if (dev->adev->capture_transfer_done >=
+			    runtime->period_size) {
+				dev->adev->capture_transfer_done -=
+				    runtime->period_size;
+				period_elapsed = 1;
 			}
 			spin_unlock_irqrestore(&dev->adev->slock, flags);
 
-			if(oldptr + length >= runtime->buffer_size){
-				unsigned int cnt = runtime->buffer_size-oldptr-1;
-				memcpy(runtime->dma_area+oldptr*stride, cp , cnt*stride);
-				memcpy(runtime->dma_area, cp + cnt, length*stride - cnt*stride);
+			if (oldptr + length >= runtime->buffer_size) {
+				unsigned int cnt =
+				    runtime->buffer_size - oldptr - 1;
+				memcpy(runtime->dma_area + oldptr * stride, cp,
+				       cnt * stride);
+				memcpy(runtime->dma_area, cp + cnt,
+				       length * stride - cnt * stride);
 			} else {
-				memcpy(runtime->dma_area+oldptr*stride, cp, length*stride);
+				memcpy(runtime->dma_area + oldptr * stride, cp,
+				       length * stride);
 			}
 		}
-		if(period_elapsed){
+		if (period_elapsed) {
 			snd_pcm_period_elapsed(substream);
 		}
 	}
 	urb->status = 0;
-	
-	if(dev->adev->shutdown)
+
+	if (dev->adev->shutdown)
 		return;
 
-	if((status = usb_submit_urb(urb, GFP_ATOMIC))){
-		em28xx_errdev("resubmit of audio urb failed (error=%i)\n", status);
+	if ((status = usb_submit_urb(urb, GFP_ATOMIC))) {
+		em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
+			      status);
 	}
 	return;
 }
@@ -292,10 +311,10 @@ static void em28xx_audio_isocirq(struct urb *urb)
 static int em28xx_isoc_audio_deinit(struct em28xx *dev)
 {
 	int i;
-	for(i=0;i<EM28XX_AUDIO_BUFS;i++){
+	for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
 		usb_kill_urb(dev->adev->urb[i]);
 		usb_free_urb(dev->adev->urb[i]);
-		dev->adev->urb[i]=NULL;
+		dev->adev->urb[i] = NULL;
 	}
 	return 0;
 }
@@ -304,40 +323,42 @@ static int em28xx_init_audio_isoc(struct em28xx *dev)
 {
 	int i;
 	int errCode;
-	const int sb_size=EM28XX_NUM_AUDIO_PACKETS * EM28XX_AUDIO_MAX_PACKET_SIZE;
+	const int sb_size =
+	    EM28XX_NUM_AUDIO_PACKETS * EM28XX_AUDIO_MAX_PACKET_SIZE;
 
-
-	for(i=0;i<EM28XX_AUDIO_BUFS;i++){
+	for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
 		struct urb *urb;
-		int j,k;
-		dev->adev->transfer_buffer[i]=kmalloc(sb_size,GFP_ATOMIC);
-		if(!dev->adev->transfer_buffer[i]){
+		int j, k;
+		dev->adev->transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
+		if (!dev->adev->transfer_buffer[i]) {
 			return -ENOMEM;
 		}
-		memset(dev->adev->transfer_buffer[i],0x80,sb_size);
-		urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS,GFP_ATOMIC);
-		if(urb){
-			urb->dev=dev->udev;
-			urb->context=dev;
-			urb->pipe=usb_rcvisocpipe(dev->udev,0x83);
+		memset(dev->adev->transfer_buffer[i], 0x80, sb_size);
+		urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
+		if (urb) {
+			urb->dev = dev->udev;
+			urb->context = dev;
+			urb->pipe = usb_rcvisocpipe(dev->udev, 0x83);
 			urb->transfer_flags = URB_ISO_ASAP;
 			urb->transfer_buffer = dev->adev->transfer_buffer[i];
-			urb->interval=1;
+			urb->interval = 1;
 			urb->complete = em28xx_audio_isocirq;
 			urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
 			urb->transfer_buffer_length = sb_size;
-			for(j=k=0; j<EM28XX_NUM_AUDIO_PACKETS;j++,k+=EM28XX_AUDIO_MAX_PACKET_SIZE){
+			for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
+			     j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
 				urb->iso_frame_desc[j].offset = k;
-				urb->iso_frame_desc[j].length=EM28XX_AUDIO_MAX_PACKET_SIZE;
+				urb->iso_frame_desc[j].length =
+				    EM28XX_AUDIO_MAX_PACKET_SIZE;
 			}
-			dev->adev->urb[i]=urb;
+			dev->adev->urb[i] = urb;
 		} else {
 			return -ENOMEM;
 		}
 	}
-	for(i=0;i<EM28XX_AUDIO_BUFS;i++){
+	for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
 		errCode = usb_submit_urb(dev->adev->urb[i], GFP_ATOMIC);
-		if (errCode){
+		if (errCode) {
 			em28xx_isoc_audio_deinit(dev);
 			return errCode;
 		}
@@ -345,27 +366,28 @@ static int em28xx_init_audio_isoc(struct em28xx *dev)
 	return 0;
 }
 
-
-static int em28xx_cmd(struct em28xx *dev, int cmd,int arg)
+static int em28xx_cmd(struct em28xx *dev, int cmd, int arg)
 {
-	switch(cmd){
-		case EM28XX_CAPTURE_STREAM_EN:
-			if(dev->adev->capture_stream == STREAM_OFF && arg==1){
-				dev->adev->capture_stream=STREAM_ON;
-				em28xx_init_audio_isoc(dev);
-			} else if (dev->adev->capture_stream==STREAM_ON && arg==0){
-				dev->adev->capture_stream=STREAM_OFF;
-				em28xx_isoc_audio_deinit(dev);
-			} else {
-				printk("An underrun occured very likely... ignoring it\n");
-			}
-			return 0;
-		default:
-			return -EINVAL;
+	switch (cmd) {
+	case EM28XX_CAPTURE_STREAM_EN:
+		if (dev->adev->capture_stream == STREAM_OFF && arg == 1) {
+			dev->adev->capture_stream = STREAM_ON;
+			em28xx_init_audio_isoc(dev);
+		} else if (dev->adev->capture_stream == STREAM_ON && arg == 0) {
+			dev->adev->capture_stream = STREAM_OFF;
+			em28xx_isoc_audio_deinit(dev);
+		} else {
+			printk
+			    ("An underrun occured very likely... ignoring it\n");
+		}
+		return 0;
+	default:
+		return -EINVAL;
 	}
 }
 
-static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream *substream)
+static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
+						    *substream)
 {
 	struct em28xx *dev;
 	snd_pcm_uframes_t hwptr_done;
@@ -393,7 +415,6 @@ static struct snd_pcm_ops snd_em28xx_pcm_capture = {
 	.page = snd_pcm_get_vmalloc_page,
 };
 
-
 static int em28xx_audio_init(struct em28xx *dev)
 {
 	struct em28xx_audio *adev;
@@ -404,54 +425,54 @@ static int em28xx_audio_init(struct em28xx *dev)
 	int err;
 	printk("em28xx-audio.c: probing for em28x1 non standard usbaudio\n");
 	printk("em28xx-audio.c: Copyright (C) 2006 Markus Rechberger\n");
-	adev=kzalloc(sizeof(*adev),GFP_KERNEL);
-	if(!adev){
+	adev = kzalloc(sizeof(*adev), GFP_KERNEL);
+	if (!adev) {
 		printk("em28xx-audio.c: out of memory\n");
 		return -1;
 	}
-	card = snd_card_new(index[devnr], "Em28xx Audio", THIS_MODULE,0);
-	if(card==NULL){
+	card = snd_card_new(index[devnr], "Em28xx Audio", THIS_MODULE, 0);
+	if (card == NULL) {
 		kfree(adev);
 		return -ENOMEM;
 	}
 
 	spin_lock_init(&adev->slock);
-	ret=snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
+	ret = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
 	pcm->info_flags = 0;
 	pcm->private_data = dev;
-	strcpy(pcm->name,"Empia 28xx Capture");
+	strcpy(pcm->name, "Empia 28xx Capture");
 	strcpy(card->driver, "Empia Em28xx Audio");
 	strcpy(card->shortname, "Em28xx Audio");
-	strcpy(card->longname,"Empia Em28xx Audio");
+	strcpy(card->longname, "Empia Em28xx Audio");
 
-	if((err = snd_card_register(card))<0){
+	if ((err = snd_card_register(card)) < 0) {
 		snd_card_free(card);
 		return -ENOMEM;
 	}
-	adev->sndcard=card;
-	adev->udev=dev->udev;
-	dev->adev=adev;
+	adev->sndcard = card;
+	adev->udev = dev->udev;
+	dev->adev = adev;
 	return 0;
 }
 
 static int em28xx_audio_fini(struct em28xx *dev)
 {
-	if(dev==NULL)
+	if (dev == NULL)
 		return 0;
-	if(dev->adev){
+	if (dev->adev) {
 		snd_card_free(dev->adev->sndcard);
 		kfree(dev->adev);
-		dev->adev=NULL;
+		dev->adev = NULL;
 	}
 	return 0;
 }
 
 static struct em28xx_ops audio_ops = {
-	.id	= EM28XX_AUDIO,
-	.name	= "Em28xx Audio Extension",
-	.init	= em28xx_audio_init,
-	.fini	= em28xx_audio_fini,
+	.id = EM28XX_AUDIO,
+	.name = "Em28xx Audio Extension",
+	.init = em28xx_audio_init,
+	.fini = em28xx_audio_fini,
 };
 
 static int __init em28xx_alsa_register(void)