[ALSA] ad1816a - Add clockfreq module option

Documentation,AD1816A driver
Added clockfreq module option for the card with a different clock frequency
than 33kHz.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/ad1816a.h

@@ -138,6 +138,7 @@ struct _snd_ad1816a {
 	spinlock_t lock;
 
 	unsigned short mode;
+	unsigned int clock_freq;
 
 	snd_card_t *card;
 	snd_pcm_t *pcm;

sound/isa/ad1816a/ad1816a.c

@@ -53,6 +53,7 @@ static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ;	/* Pnp setup */
 static int mpu_irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ;	/* Pnp setup */
 static int dma1[SNDRV_CARDS] = SNDRV_DEFAULT_DMA;	/* PnP setup */
 static int dma2[SNDRV_CARDS] = SNDRV_DEFAULT_DMA;	/* PnP setup */
+static int clockfreq[SNDRV_CARDS];
 
 module_param_array(index, int, NULL, 0444);
 MODULE_PARM_DESC(index, "Index value for ad1816a based soundcard.");
@@ -74,6 +75,8 @@ module_param_array(dma1, int, NULL, 0444);
 MODULE_PARM_DESC(dma1, "1st DMA # for ad1816a driver.");
 module_param_array(dma2, int, NULL, 0444);
 MODULE_PARM_DESC(dma2, "2nd DMA # for ad1816a driver.");
+module_param_array(clockfreq, int, NULL, 0444);
+MODULE_PARM_DESC(clockfreq, "Clock frequency for ad1816a driver (default = 0).");
 
 struct snd_card_ad1816a {
 	struct pnp_dev *dev;
@@ -209,6 +212,8 @@ static int __devinit snd_card_ad1816a_probe(int dev, struct pnp_card_link *pcard
 		snd_card_free(card);
 		return error;
 	}
+	if (clockfreq[dev] >= 5000 && clockfreq[dev] <= 100000)
+		chip->clock_freq = clockfreq[dev];
 
 	strcpy(card->driver, "AD1816A");
 	strcpy(card->shortname, "ADI SoundPort AD1816A");

sound/isa/ad1816a/ad1816a_lib.c

@@ -234,7 +234,7 @@ static int snd_ad1816a_playback_prepare(snd_pcm_substream_t *substream)
 	ad1816a_t *chip = snd_pcm_substream_chip(substream);
 	unsigned long flags;
 	snd_pcm_runtime_t *runtime = substream->runtime;
-	unsigned int size;
+	unsigned int size, rate;
 
 	spin_lock_irqsave(&chip->lock, flags);
 
@@ -245,7 +245,10 @@ static int snd_ad1816a_playback_prepare(snd_pcm_substream_t *substream)
 	snd_dma_program(chip->dma1, runtime->dma_addr, size,
 			DMA_MODE_WRITE | DMA_AUTOINIT);
 
-	snd_ad1816a_write(chip, AD1816A_PLAYBACK_SAMPLE_RATE, runtime->rate);
+	rate = runtime->rate;
+	if (chip->clock_freq)
+		rate = (rate * 33000) / chip->clock_freq;
+	snd_ad1816a_write(chip, AD1816A_PLAYBACK_SAMPLE_RATE, rate);
 	snd_ad1816a_out_mask(chip, AD1816A_PLAYBACK_CONFIG,
 		AD1816A_FMT_ALL | AD1816A_FMT_STEREO,
 		snd_ad1816a_get_format(chip, runtime->format,
@@ -263,7 +266,7 @@ static int snd_ad1816a_capture_prepare(snd_pcm_substream_t *substream)
 	ad1816a_t *chip = snd_pcm_substream_chip(substream);
 	unsigned long flags;
 	snd_pcm_runtime_t *runtime = substream->runtime;
-	unsigned int size;
+	unsigned int size, rate;
 
 	spin_lock_irqsave(&chip->lock, flags);
 
@@ -274,7 +277,10 @@ static int snd_ad1816a_capture_prepare(snd_pcm_substream_t *substream)
 	snd_dma_program(chip->dma2, runtime->dma_addr, size,
 			DMA_MODE_READ | DMA_AUTOINIT);
 
-	snd_ad1816a_write(chip, AD1816A_CAPTURE_SAMPLE_RATE, runtime->rate);
+	rate = runtime->rate;
+	if (chip->clock_freq)
+		rate = (rate * 33000) / chip->clock_freq;
+	snd_ad1816a_write(chip, AD1816A_CAPTURE_SAMPLE_RATE, rate);
 	snd_ad1816a_out_mask(chip, AD1816A_CAPTURE_CONFIG,
 		AD1816A_FMT_ALL | AD1816A_FMT_STEREO,
 		snd_ad1816a_get_format(chip, runtime->format,