AudioInjector Octo : Consolidate sample rates and add a codec reset.

This patch consolidates the sample rates which the audioinjector.net octo
sound card can use. The consolidation of sample rates are due to the
capabilities of the cs42448 codec.

This codec also requires a hard reset using the GPIO pin 5 upon probe.

sound/soc/bcm/audioinjector-octo-soundcard.c

@@ -27,8 +27,18 @@
 #include <sound/control.h>
 
 static struct gpio_descs *mult_gpios;
+static struct gpio_desc *codec_rst_gpio;
 static unsigned int audioinjector_octo_rate;
 
+static const unsigned int audioinjector_octo_rates[] = {
+	96000, 48000, 88200, 44100,
+};
+
+static struct snd_pcm_hw_constraint_list audioinjector_octo_constraints = {
+	.list = audioinjector_octo_rates,
+	.count = ARRAY_SIZE(audioinjector_octo_rates),
+};
+
 static int audioinjector_octo_dai_init(struct snd_soc_pcm_runtime *rtd)
 {
 	return snd_soc_dai_set_bclk_ratio(rtd->cpu_dai, 64);
@@ -42,6 +52,11 @@ static int audioinjector_octo_startup(struct snd_pcm_substream *substream)
 	rtd->cpu_dai->driver->capture.channels_min = 8;
 	rtd->cpu_dai->driver->capture.channels_max = 8;
 	rtd->codec_dai->driver->capture.channels_max = 8;
+
+	snd_pcm_hw_constraint_list(substream->runtime, 0,
+				SNDRV_PCM_HW_PARAM_RATE,
+				&audioinjector_octo_constraints);
+
 	return 0;
 }
 
@@ -76,7 +91,21 @@ static int audioinjector_octo_hw_params(struct snd_pcm_substream *substream,
 
 	audioinjector_octo_rate = params_rate(params);
 
-	return 0;
+	// Set the correct sysclock for the codec
+	switch (audioinjector_octo_rate) {
+	case 96000:
+	case 48000:
+		return snd_soc_dai_set_sysclk(rtd->codec_dai, 0, 49152000,
+									0);
+		break;
+	case 88200:
+	case 44100:
+		return snd_soc_dai_set_sysclk(rtd->codec_dai, 0, 45185400,
+									0);
+		break;
+	default:
+		return -EINVAL;
+	}
 }
 
 static int audioinjector_octo_trigger(struct snd_pcm_substream *substream,
@@ -92,49 +121,17 @@ static int audioinjector_octo_trigger(struct snd_pcm_substream *substream,
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		switch (audioinjector_octo_rate) {
-		case 192000:
-			mult[3] = 1;
-		case 176640:
-			mult[0] = 1;
-			mult[1] = 1;
-			mult[2] = 1;
-			break;
 		case 96000:
 			mult[3] = 1;
 		case 88200:
 			mult[1] = 1;
 			mult[2] = 1;
 			break;
-		case 64000:
-			mult[3] = 1;
-		case 58800:
-			mult[0] = 1;
-			mult[2] = 1;
-			break;
 		case 48000:
 			mult[3] = 1;
 		case 44100:
 			mult[2] = 1;
 			break;
-		case 32000:
-			mult[3] = 1;
-		case 29400:
-			mult[0] = 1;
-			mult[1] = 1;
-			break;
-		case 24000:
-			mult[3] = 1;
-		case 22050:
-			mult[1] = 1;
-			break;
-		case 16000:
-			mult[3] = 1;
-		case 14700:
-			mult[0] = 1;
-			break;
-		case 8000:
-			mult[3] = 1;
-			break;
 		default:
 			return -EINVAL;
 		}
@@ -231,6 +228,18 @@ static int audioinjector_octo_probe(struct platform_device *pdev)
 		if (IS_ERR(mult_gpios))
 			return PTR_ERR(mult_gpios);
 
+		codec_rst_gpio = devm_gpiod_get_optional(&pdev->dev, "reset",
+								GPIOD_OUT_LOW);
+		if (IS_ERR(codec_rst_gpio))
+			return PTR_ERR(codec_rst_gpio);
+
+		if (codec_rst_gpio)
+			gpiod_set_value(codec_rst_gpio, 0);
+		msleep(5);
+		if (codec_rst_gpio)
+			gpiod_set_value(codec_rst_gpio, 1);
+		msleep(50);
+
 		if (i2s_node && codec_node) {
 			dai->cpu_dai_name = NULL;
 			dai->cpu_of_node = i2s_node;