[ALSA] au1x00 - Code clean up

Modules: MIPS AU1x00 driver

Clean up snd-au1x00 driver code:

- Remove global variables
- Remove old compatibility codes
- Fix DMA-link allocation/release functions in hw_params and hw_free
  callbacks (they may be called multiple times)
- Fix spinlocks
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/mips/au1x00.c

@@ -50,12 +50,7 @@
 MODULE_AUTHOR("Charles Eidsness <charles@cooper-street.com>");
 MODULE_DESCRIPTION("Au1000 AC'97 ALSA Driver");
 MODULE_LICENSE("GPL");
-#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,8)
 MODULE_SUPPORTED_DEVICE("{{AMD,Au1000 AC'97}}");
-#else
-MODULE_CLASSES("{sound}");
-MODULE_DEVICES("{{AMD,Au1000 AC'97}}");
-#endif
 
 #define PLAYBACK 0
 #define CAPTURE 1
@@ -68,8 +63,6 @@ MODULE_DEVICES("{{AMD,Au1000 AC'97}}");
 #define READ_WAIT 2
 #define RW_DONE 3
 
-DECLARE_WAIT_QUEUE_HEAD(ac97_command_wq);
-
 typedef struct au1000_period au1000_period_t;
 struct au1000_period
 {
@@ -94,7 +87,8 @@ struct audio_stream {
 	int dma;
 	spinlock_t dma_lock;
 	au1000_period_t * buffer;
-	unsigned long period_size;
+	unsigned int period_size;
+	unsigned int periods;
 };
 
 typedef struct snd_card_au1000 {
@@ -109,11 +103,9 @@ typedef struct snd_card_au1000 {
 	audio_stream_t *stream[2];	/* playback & capture */
 } au1000_t;
 
-static au1000_t *au1000 = NULL;
-
 /*--------------------------- Local Functions --------------------------------*/
 static void
-au1000_set_ac97_xmit_slots(long xmit_slots)
+au1000_set_ac97_xmit_slots(au1000_t *au1000, long xmit_slots)
 {
 	u32 volatile ac97_config;
 
@@ -126,7 +118,7 @@ au1000_set_ac97_xmit_slots(long xmit_slots)
 }
 
 static void
-au1000_set_ac97_recv_slots(long recv_slots)
+au1000_set_ac97_recv_slots(au1000_t *au1000, long recv_slots)
 {
 	u32 volatile ac97_config;
 
@@ -140,61 +132,76 @@ au1000_set_ac97_recv_slots(long recv_slots)
 
 
 static void
-au1000_dma_stop(audio_stream_t *stream)
+au1000_release_dma_link(audio_stream_t *stream)
 {
-	unsigned long   flags;
 	au1000_period_t * pointer;
 	au1000_period_t * pointer_next;
 
-	if (stream->buffer != NULL) {
-		spin_lock_irqsave(&stream->dma_lock, flags);
-		disable_dma(stream->dma);
-		spin_unlock_irqrestore(&stream->dma_lock, flags);
-
+	stream->period_size = 0;
+	stream->periods = 0;
 	pointer = stream->buffer;
-		pointer_next = stream->buffer->next;
-
+	if (! pointer)
+		return;
 	do {
+		pointer_next = pointer->next;
 		kfree(pointer);
 		pointer = pointer_next;
-			pointer_next = pointer->next;
 	} while (pointer != stream->buffer);
-
 	stream->buffer = NULL;
-	}
 }
 
-static void
-au1000_dma_start(audio_stream_t *stream)
+static int
+au1000_setup_dma_link(audio_stream_t *stream, unsigned int period_bytes,
+		      unsigned int periods)
 {
 	snd_pcm_substream_t *substream = stream->substream;
 	snd_pcm_runtime_t *runtime = substream->runtime;
-
-	unsigned long flags, dma_start;
+	unsigned long dma_start;
 	int i;
-	au1000_period_t * pointer;
 
-	if (stream->buffer == NULL) {
 	dma_start = virt_to_phys(runtime->dma_area);
 
-		stream->period_size = frames_to_bytes(runtime,
-			runtime->period_size);
+	if (stream->period_size == period_bytes &&
+	    stream->periods == periods)
+		return 0; /* not changed */
+
+	au1000_release_dma_link(stream);
+
+	stream->period_size = period_bytes;
+	stream->periods = periods;
+
 	stream->buffer = kmalloc(sizeof(au1000_period_t), GFP_KERNEL);
+	if (! stream->buffer)
+		return -ENOMEM;
 	pointer = stream->buffer;
-		for (i = 0 ; i < runtime->periods ; i++) {
-			pointer->start = (u32)(dma_start +
-				(i * stream->period_size));
-			pointer->relative_end = (u32)
-				(((i+1) * stream->period_size) - 0x1);
-			if ( i < runtime->periods - 1) {
-				pointer->next = kmalloc(sizeof(au1000_period_t)
-					, GFP_KERNEL);
+	for (i = 0; i < periods; i++) {
+		pointer->start = (u32)(dma_start + (i * period_bytes));
+		pointer->relative_end = (u32) (((i+1) * period_bytes) - 0x1);
+		if (i < periods - 1) {
+			pointer->next = kmalloc(sizeof(struct au1000_period), GFP_KERNEL);
+			if (! pointer->next) {
+				au1000_release_dma_link(stream);
+				return -ENOMEM;
+			}
 			pointer = pointer->next;
 		}
 	}
 	pointer->next = stream->buffer;
+	return 0;
+}
+
+static void
+au1000_dma_stop(audio_stream_t *stream)
+{
+	snd_assert(stream->buffer, return);
+	disable_dma(stream->dma);
+}
+
+static void
+au1000_dma_start(audio_stream_t *stream)
+{
+	snd_assert(stream->buffer, return);
 
-		spin_lock_irqsave(&stream->dma_lock, flags);
 	init_dma(stream->dma);
 	if (get_dma_active_buffer(stream->dma) == 0) {
 		clear_dma_done0(stream->dma);
@@ -211,8 +218,6 @@ au1000_dma_start(audio_stream_t *stream)
 	}
 	enable_dma_buffers(stream->dma);
 	start_dma(stream->dma);
-		spin_unlock_irqrestore(&stream->dma_lock, flags);
-	}
 }
 
 static irqreturn_t
@@ -238,11 +243,9 @@ au1000_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 		enable_dma_buffer1(stream->dma);
 		break;
 	case (DMA_D0 | DMA_D1):
-		spin_unlock(&stream->dma_lock);
 		printk(KERN_ERR "DMA %d missed interrupt.\n",stream->dma);
 		au1000_dma_stop(stream);
 		au1000_dma_start(stream);
-		spin_lock(&stream->dma_lock);
 		break;
 	case (~DMA_D0 & ~DMA_D1):
 		printk(KERN_ERR "DMA %d empty irq.\n",stream->dma);
@@ -261,7 +264,7 @@ static snd_pcm_hw_constraint_list_t hw_constraints_rates = {
 	.mask	= 0,
 };
 
-static snd_pcm_hardware_t snd_au1000 =
+static snd_pcm_hardware_t snd_au1000_hw =
 {
 	.info			= (SNDRV_PCM_INFO_INTERLEAVED | \
 				SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID),
@@ -283,10 +286,12 @@ static snd_pcm_hardware_t snd_au1000 =
 static int
 snd_au1000_playback_open(snd_pcm_substream_t * substream)
 {
+	au1000_t *au1000 = substream->pcm->private_data;
+
 	au1000->stream[PLAYBACK]->substream = substream;
 	au1000->stream[PLAYBACK]->buffer = NULL;
 	substream->private_data = au1000->stream[PLAYBACK];
-	substream->runtime->hw = snd_au1000;
+	substream->runtime->hw = snd_au1000_hw;
 	return (snd_pcm_hw_constraint_list(substream->runtime, 0,
 		SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
 }
@@ -294,10 +299,12 @@ snd_au1000_playback_open(snd_pcm_substream_t * substream)
 static int
 snd_au1000_capture_open(snd_pcm_substream_t * substream)
 {
+	au1000_t *au1000 = substream->pcm->private_data;
+
 	au1000->stream[CAPTURE]->substream = substream;
 	au1000->stream[CAPTURE]->buffer = NULL;
 	substream->private_data = au1000->stream[CAPTURE];
-	substream->runtime->hw = snd_au1000;
+	substream->runtime->hw = snd_au1000_hw;
 	return (snd_pcm_hw_constraint_list(substream->runtime, 0,
 		SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
 
@@ -306,6 +313,8 @@ snd_au1000_capture_open(snd_pcm_substream_t * substream)
 static int
 snd_au1000_playback_close(snd_pcm_substream_t * substream)
 {
+	au1000_t *au1000 = substream->pcm->private_data;
+
 	au1000->stream[PLAYBACK]->substream = NULL;
 	return 0;
 }
@@ -313,6 +322,8 @@ snd_au1000_playback_close(snd_pcm_substream_t * substream)
 static int
 snd_au1000_capture_close(snd_pcm_substream_t * substream)
 {
+	au1000_t *au1000 = substream->pcm->private_data;
+
 	au1000->stream[CAPTURE]->substream = NULL;
 	return 0;
 }
@@ -321,25 +332,36 @@ static int
 snd_au1000_hw_params(snd_pcm_substream_t * substream,
 					snd_pcm_hw_params_t * hw_params)
 {
-	return snd_pcm_lib_malloc_pages(substream,
+	audio_stream_t *stream = substream->private_data;
+	int err;
+
+	err = snd_pcm_lib_malloc_pages(substream,
 				       params_buffer_bytes(hw_params));
+	if (err < 0)
+		return err;
+	return au1000_setup_dma_link(stream,
+				     params_period_bytes(hw_params),
+				     params_periods(hw_params));
 }
 
 static int
 snd_au1000_hw_free(snd_pcm_substream_t * substream)
 {
+	audio_stream_t *stream = substream->private_data;
+	au1000_release_dma_link(stream);
 	return snd_pcm_lib_free_pages(substream);
 }
 
 static int
 snd_au1000_playback_prepare(snd_pcm_substream_t * substream)
 {
+	au1000_t *au1000 = substream->pcm->private_data;
 	snd_pcm_runtime_t *runtime = substream->runtime;
 
-	if (runtime->channels == 1 )
-		au1000_set_ac97_xmit_slots(AC97_SLOT_4);
+	if (runtime->channels == 1)
+		au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_4);
 	else
-		au1000_set_ac97_xmit_slots(AC97_SLOT_3 | AC97_SLOT_4);
+		au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
 	snd_ac97_set_rate(au1000->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate);
 	return 0;
 }
@@ -347,12 +369,13 @@ snd_au1000_playback_prepare(snd_pcm_substream_t * substream)
 static int
 snd_au1000_capture_prepare(snd_pcm_substream_t * substream)
 {
+	au1000_t *au1000 = substream->pcm->private_data;
 	snd_pcm_runtime_t *runtime = substream->runtime;
 
-	if (runtime->channels == 1 )
-		au1000_set_ac97_recv_slots(AC97_SLOT_4);
+	if (runtime->channels == 1)
+		au1000_set_ac97_recv_slots(au1000, AC97_SLOT_4);
 	else
-		au1000_set_ac97_recv_slots(AC97_SLOT_3 | AC97_SLOT_4);
+		au1000_set_ac97_recv_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
 	snd_ac97_set_rate(au1000->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
 	return 0;
 }
@@ -363,6 +386,7 @@ snd_au1000_trigger(snd_pcm_substream_t * substream, int cmd)
 	audio_stream_t *stream = substream->private_data;
 	int err = 0;
 
+	spin_lock(&stream->dma_lock);
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 		au1000_dma_start(stream);
@@ -374,6 +398,7 @@ snd_au1000_trigger(snd_pcm_substream_t * substream, int cmd)
 		err = -EINVAL;
 		break;
 	}
+	spin_unlock(&stream->dma_lock);
 	return err;
 }
 
@@ -382,12 +407,11 @@ snd_au1000_pointer(snd_pcm_substream_t * substream)
 {
 	audio_stream_t *stream = substream->private_data;
 	snd_pcm_runtime_t *runtime = substream->runtime;
-	unsigned long flags;
 	long location;
 
-	spin_lock_irqsave(&stream->dma_lock, flags);
+	spin_lock(&stream->dma_lock);
 	location = get_dma_residue(stream->dma);
-	spin_unlock_irqrestore(&stream->dma_lock, flags);
+	spin_unlock(&stream->dma_lock);
 	location = stream->buffer->relative_end - location;
 	if (location == -1)
 		location = 0;
@@ -438,6 +462,9 @@ snd_au1000_pcm_new(void)
 	pcm->info_flags = 0;
 	strcpy(pcm->name, "Au1000 AC97 PCM");
 
+	spin_lock_init(&au1000->stream[PLAYBACK]->dma_lock);
+	spin_lock_init(&au1000->stream[CAPTURE]->dma_lock);
+
 	flags = claim_dma_lock();
 	if ((au1000->stream[PLAYBACK]->dma = request_au1000_dma(DMA_ID_AC97C_TX,
 			"AC97 TX", au1000_dma_interrupt, SA_INTERRUPT,
@@ -457,8 +484,6 @@ snd_au1000_pcm_new(void)
 	set_dma_mode(au1000->stream[CAPTURE]->dma,
 		     get_dma_mode(au1000->stream[CAPTURE]->dma) & ~DMA_NC);
 	release_dma_lock(flags);
-	spin_lock_init(&au1000->stream[PLAYBACK]->dma_lock);
-	spin_lock_init(&au1000->stream[CAPTURE]->dma_lock);
 	au1000->pcm = pcm;
 	return 0;
 }
@@ -469,9 +494,11 @@ snd_au1000_pcm_new(void)
 static unsigned short
 snd_au1000_ac97_read(ac97_t *ac97, unsigned short reg)
 {
+	au1000_t *au1000 = ac97->private_data;
 	u32 volatile cmd;
 	u16 volatile data;
 	int             i;
+
 	spin_lock(&au1000->ac97_lock);
 /* would rather use the interupt than this polling but it works and I can't
 get the interupt driven case to work efficiently */
@@ -505,8 +532,10 @@ get the interupt driven case to work efficiently */
 static void
 snd_au1000_ac97_write(ac97_t *ac97, unsigned short reg, unsigned short val)
 {
+	au1000_t *au1000 = ac97->private_data;
 	u32 cmd;
 	int i;
+
 	spin_lock(&au1000->ac97_lock);
 /* would rather use the interupt than this polling but it works and I can't
 get the interupt driven case to work efficiently */
@@ -522,28 +551,13 @@ get the interupt driven case to work efficiently */
 	au1000->ac97_ioport->cmd = cmd;
 	spin_unlock(&au1000->ac97_lock);
 }
-static void
-snd_au1000_ac97_free(ac97_t *ac97)
-{
-	au1000->ac97 = NULL;
-}
 
 static int __devinit
-snd_au1000_ac97_new(void)
+snd_au1000_ac97_new(au1000_t *au1000)
 {
 	int err;
-
-#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,8)
-	ac97_bus_t *pbus;
-	ac97_template_t ac97;
- 	static ac97_bus_ops_t ops = {
-		.write = snd_au1000_ac97_write,
-		.read = snd_au1000_ac97_read,
-	};
-#else
 	ac97_bus_t bus, *pbus;
 	ac97_t ac97;
-#endif
 
 	if ((au1000->ac97_res_port = request_region(AC97C_CONFIG,
 	       		sizeof(au1000_ac97_reg_t), "Au1x00 AC97")) == NULL) {
@@ -554,8 +568,6 @@ snd_au1000_ac97_new(void)
 
 	spin_lock_init(&au1000->ac97_lock);
 
-	spin_lock(&au1000->ac97_lock);
-
 	/* configure pins for AC'97
 	TODO: move to board_setup.c */
 	au_writel(au_readl(SYS_PINFUNC) & ~0x02, SYS_PINFUNC);
@@ -572,26 +584,16 @@ snd_au1000_ac97_new(void)
 	au1000->ac97_ioport->config = 0x0;
 	mdelay(5);
 
-	spin_unlock(&au1000->ac97_lock);
-
 	/* Initialise AC97 middle-layer */
-#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,8)
 	if ((err = snd_ac97_bus(au1000->card, 0, &ops, au1000, &pbus)) < 0)
  		return err;
-#else
-	memset(&bus, 0, sizeof(bus));
-	bus.write = snd_au1000_ac97_write;
-	bus.read = snd_au1000_ac97_read;
-	if ((err = snd_ac97_bus(au1000->card, &bus, &pbus)) < 0)
-		return err;
-#endif
+
 	memset(&ac97, 0, sizeof(ac97));
 	ac97.private_data = au1000;
-	ac97.private_free = snd_au1000_ac97_free;
 	if ((err = snd_ac97_mixer(pbus, &ac97, &au1000->ac97)) < 0)
 		return err;
-	return 0;
 
+	return 0;
 }
 
 /*------------------------------ Setup / Destroy ----------------------------*/
@@ -599,6 +601,7 @@ snd_au1000_ac97_new(void)
 void
 snd_au1000_free(snd_card_t *card)
 {
+	au1000_t *au1000 = card->private_data;
 
 	if (au1000->ac97_res_port) {
 		/* put internal AC97 block into reset */
@@ -614,73 +617,70 @@ snd_au1000_free(snd_card_t *card)
 		free_au1000_dma(au1000->stream[CAPTURE]->dma);
 
 	kfree(au1000->stream[PLAYBACK]);
-	au1000->stream[PLAYBACK] = NULL;
 	kfree(au1000->stream[CAPTURE]);
-	au1000->stream[CAPTURE] = NULL;
-	kfree(au1000);
-	au1000 = NULL;
-
 }
 
+
+static snd_card_t *au1000_card;
+
 static int __init
 au1000_init(void)
 {
 	int err;
+	snd_card_t *card;
+	au1000_t *au1000;
 
-	au1000 = kmalloc(sizeof(au1000_t), GFP_KERNEL);
-	if (au1000 == NULL)
-		return -ENOMEM;
-	au1000->stream[PLAYBACK] = kmalloc(sizeof(audio_stream_t), GFP_KERNEL);
-	if (au1000->stream[PLAYBACK] == NULL)
-		return -ENOMEM;
-	au1000->stream[CAPTURE] = kmalloc(sizeof(audio_stream_t), GFP_KERNEL);
-	if (au1000->stream[CAPTURE] == NULL)
+	card = snd_card_new(-1, "AC97", THIS_MODULE, sizeof(au1000_t));
+	if (card == NULL)
 		return -ENOMEM;
+
+	card->private_free = snd_au1000_free;
+	au1000 = card->private_data;
 	/* so that snd_au1000_free will work as intended */
+	au1000->card = card;
 	au1000->stream[PLAYBACK]->dma = -1;
 	au1000->stream[CAPTURE]->dma = -1;
  	au1000->ac97_res_port = NULL;
-
-	au1000->card = snd_card_new(-1, "AC97", THIS_MODULE, sizeof(au1000_t));
-	if (au1000->card == NULL) {
-		snd_au1000_free(au1000->card);
+	au1000->stream[PLAYBACK] = kmalloc(sizeof(audio_stream_t), GFP_KERNEL);
+	au1000->stream[CAPTURE] = kmalloc(sizeof(audio_stream_t), GFP_KERNEL);
+	if (au1000->stream[PLAYBACK] == NULL ||
+	    au1000->stream[CAPTURE] == NULL) {
+		snd_card_free(card);
 		return -ENOMEM;
 	}
 
-	au1000->card->private_data = (au1000_t *)au1000;
-	au1000->card->private_free = snd_au1000_free;
-
-	if ((err = snd_au1000_ac97_new()) < 0 ) {
-		snd_card_free(au1000->card);
+	if ((err = snd_au1000_ac97_new(au1000)) < 0 ) {
+		snd_card_free(card);
 		return err;
 	}
 
-	if ((err = snd_au1000_pcm_new()) < 0) {
-		snd_card_free(au1000->card);
+	if ((err = snd_au1000_pcm_new(au1000)) < 0) {
+		snd_card_free(card);
 		return err;
 	}
 
-	strcpy(au1000->card->driver, "AMD-Au1000-AC97");
-	strcpy(au1000->card->shortname, "Au1000-AC97");
-	sprintf(au1000->card->longname, "AMD Au1000--AC97 ALSA Driver");
+	strcpy(card->driver, "Au1000-AC97");
+	strcpy(card->shortname, "AMD Au1000-AC97");
+	sprintf(card->longname, "AMD Au1000--AC97 ALSA Driver");
 
-	if ((err = snd_card_set_generic_dev(au1000->card)) < 0) {
-		snd_card_free(au1000->card);
+	if ((err = snd_card_set_generic_dev(card)) < 0) {
+		snd_card_free(card);
 		return err;
 	}
 
-	if ((err = snd_card_register(au1000->card)) < 0) {
-		snd_card_free(au1000->card);
+	if ((err = snd_card_register(card)) < 0) {
+		snd_card_free(card);
 		return err;
 	}
 
 	printk( KERN_INFO "ALSA AC97: Driver Initialized\n" );
+	au1000_card = card;
 	return 0;
 }
 
 static void __exit au1000_exit(void)
 {
-	snd_card_free(au1000->card);
+	snd_card_free(au1000_card);
 }
 
 module_init(au1000_init);