[ALSA] ASoC AT91xxxx - SSC port DSP support

This patch series by Frank Madarino updates the AT91xxxx core to add
DSP/PCM audio hardware formats.
Changes:-
 o Rename at19-i2s.c -> at91-ssc.c
 o Rename at91-i2s.h -> at91-ssc.h
 o Add DSP hardware formats.
 o Rename various I2S labels to SSC

Signed-off-by: Frank Mandarino <fmandarino@endrelia.com>
Signed-off-by: Liam Girdwood <lg@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

2 files changed, 169 insertions, 98 deletions

diff --git a/sound/soc/at91/at91-i2s.c b/sound/soc/at91/at91-ssc.c
index 9fc0c0388881..db1635a09556 100644
--- a/sound/soc/at91/at91-i2s.c
+++ b/sound/soc/at91/at91-ssc.c
@@ -1,5 +1,5 @@
 /*
- * at91-i2s.c  --  ALSA SoC I2S Audio Layer Platform driver
+ * at91-ssc.c  --  ALSA SoC AT91 SSC Audio Layer Platform driver
  *
  * Author: Frank Mandarino <fmandarino@endrelia.com>
  *         Endrelia Technologies Inc.
@@ -25,6 +25,7 @@
 #include <sound/driver.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
+#include <sound/pcm_params.h>
 #include <sound/initval.h>
 #include <sound/soc.h>
 
@@ -33,10 +34,10 @@
 #include <asm/arch/at91_ssc.h>
 
 #include "at91-pcm.h"
-#include "at91-i2s.h"
+#include "at91-ssc.h"
 
 #if 0
-#define DBG(x...)       printk(KERN_DEBUG "at91-i2s:" x)
+#define DBG(x...)       printk(KERN_DEBUG "at91-ssc:" x)
 #else
 #define DBG(x...)
 #endif
@@ -92,33 +93,33 @@ static struct at91_ssc_mask ssc_rx_mask = {
  */
 static struct at91_pcm_dma_params ssc_dma_params[NUM_SSC_DEVICES][2] = {
         {{
-        .name           = "SSC0/I2S PCM Stereo out",
+        .name           = "SSC0 PCM out",
         .pdc            = &pdc_tx_reg,
         .mask           = &ssc_tx_mask,
         },
         {
-        .name           = "SSC0/I2S PCM Stereo in",
+        .name           = "SSC0 PCM in",
         .pdc            = &pdc_rx_reg,
         .mask           = &ssc_rx_mask,
         }},
 #if NUM_SSC_DEVICES == 3
         {{
-        .name           = "SSC1/I2S PCM Stereo out",
+        .name           = "SSC1 PCM out",
         .pdc            = &pdc_tx_reg,
         .mask           = &ssc_tx_mask,
         },
         {
-        .name           = "SSC1/I2S PCM Stereo in",
+        .name           = "SSC1 PCM in",
         .pdc            = &pdc_rx_reg,
         .mask           = &ssc_rx_mask,
         }},
         {{
-        .name           = "SSC2/I2S PCM Stereo out",
+        .name           = "SSC2 PCM out",
         .pdc            = &pdc_tx_reg,
         .mask           = &ssc_tx_mask,
         },
         {
-        .name           = "SSC1/I2S PCM Stereo in",
+        .name           = "SSC2 PCM in",
         .pdc            = &pdc_rx_reg,
         .mask           = &ssc_rx_mask,
         }},
@@ -171,13 +172,13 @@ static struct at91_ssc_info {
 #endif
 };
 
-static unsigned int at91_i2s_sysclk;
+static unsigned int at91_ssc_sysclk;
 
 /*
  * SSC interrupt handler.  Passes PDC interrupts to the DMA
  * interrupt handler in the PCM driver.
  */
-static irqreturn_t at91_i2s_interrupt(int irq, void *dev_id)
+static irqreturn_t at91_ssc_interrupt(int irq, void *dev_id)
 {
         struct at91_ssc_info *ssc_p = dev_id;
         struct at91_pcm_dma_params *dma_params;
@@ -209,13 +210,13 @@ static irqreturn_t at91_i2s_interrupt(int irq, void *dev_id)
 /*
  * Startup.  Only that one substream allowed in each direction.
  */
-static int at91_i2s_startup(struct snd_pcm_substream *substream)
+static int at91_ssc_startup(struct snd_pcm_substream *substream)
 {
         struct snd_soc_pcm_runtime *rtd = substream->private_data;
         struct at91_ssc_info *ssc_p = &ssc_info[rtd->dai->cpu_dai->id];
         int dir_mask;
 
-        DBG("i2s_startup: SSC_SR=0x%08lx\n",
+        DBG("ssc_startup: SSC_SR=0x%08lx\n",
                         at91_ssc_read(ssc_p->ssc.base + AT91_SSC_SR));
         dir_mask = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0x1 : 0x2;
 
@@ -234,7 +235,7 @@ static int at91_i2s_startup(struct snd_pcm_substream *substream)
  * Shutdown.  Clear DMA parameters and shutdown the SSC if there
  * are no other substreams open.
  */
-static void at91_i2s_shutdown(struct snd_pcm_substream *substream)
+static void at91_ssc_shutdown(struct snd_pcm_substream *substream)
 {
         struct snd_soc_pcm_runtime *rtd = substream->private_data;
         struct at91_ssc_info *ssc_p = &ssc_info[rtd->dai->cpu_dai->id];
@@ -281,7 +282,7 @@ static void at91_i2s_shutdown(struct snd_pcm_substream *substream)
 /*
  * Record the SSC system clock rate.
  */
-static int at91_i2s_set_dai_sysclk(struct snd_soc_cpu_dai *cpu_dai,
+static int at91_ssc_set_dai_sysclk(struct snd_soc_cpu_dai *cpu_dai,
                 int clk_id, unsigned int freq, int dir)
 {
         /*
@@ -291,7 +292,7 @@ static int at91_i2s_set_dai_sysclk(struct snd_soc_cpu_dai *cpu_dai,
          */
         switch (clk_id) {
         case AT91_SYSCLK_MCK:
-                at91_i2s_sysclk = freq;
+                at91_ssc_sysclk = freq;
                 break;
         default:
                 return -EINVAL;
@@ -303,14 +304,11 @@ static int at91_i2s_set_dai_sysclk(struct snd_soc_cpu_dai *cpu_dai,
 /*
  * Record the DAI format for use in hw_params().
  */
-static int at91_i2s_set_dai_fmt(struct snd_soc_cpu_dai *cpu_dai,
+static int at91_ssc_set_dai_fmt(struct snd_soc_cpu_dai *cpu_dai,
                 unsigned int fmt)
 {
         struct at91_ssc_info *ssc_p = &ssc_info[cpu_dai->id];
 
-        if ((fmt & SND_SOC_DAIFMT_FORMAT_MASK) != SND_SOC_DAIFMT_I2S)
-                return -EINVAL;
-
         ssc_p->daifmt = fmt;
         return 0;
 }
@@ -318,7 +316,7 @@ static int at91_i2s_set_dai_fmt(struct snd_soc_cpu_dai *cpu_dai,
 /*
  * Record SSC clock dividers for use in hw_params().
  */
-static int at91_i2s_set_dai_clkdiv(struct snd_soc_cpu_dai *cpu_dai,
+static int at91_ssc_set_dai_clkdiv(struct snd_soc_cpu_dai *cpu_dai,
         int div_id, int div)
 {
         struct at91_ssc_info *ssc_p = &ssc_info[cpu_dai->id];
@@ -355,7 +353,7 @@ static int at91_i2s_set_dai_clkdiv(struct snd_soc_cpu_dai *cpu_dai,
 /*
  * Configure the SSC.
  */
-static int at91_i2s_hw_params(struct snd_pcm_substream *substream,
+static int at91_ssc_hw_params(struct snd_pcm_substream *substream,
         struct snd_pcm_hw_params *params)
 {
         struct snd_soc_pcm_runtime *rtd = substream->private_data;
@@ -391,20 +389,50 @@ static int at91_i2s_hw_params(struct snd_pcm_substream *substream,
         channels = params_channels(params);
 
         /*
+         * Determine sample size in bits and the PDC increment.
+         */
+        switch(params_format(params)) {
+        case SNDRV_PCM_FORMAT_S8:
+                bits = 8;
+                dma_params->pdc_xfer_size = 1;
+                break;
+        case SNDRV_PCM_FORMAT_S16_LE:
+                bits = 16;
+                dma_params->pdc_xfer_size = 2;
+                break;
+        case SNDRV_PCM_FORMAT_S24_LE:
+                bits = 24;
+                dma_params->pdc_xfer_size = 4;
+                break;
+        case SNDRV_PCM_FORMAT_S32_LE:
+                bits = 32;
+                dma_params->pdc_xfer_size = 4;
+                break;
+        default:
+                printk(KERN_WARNING "at91-ssc: unsupported PCM format");
+                return -EINVAL;
+        }
+
+        /*
          * The SSC only supports up to 16-bit samples in I2S format, due
-         * to the size of the Frame Mode Register FSLEN field.  Also, I2S
-         * implies signed data.
+         * to the size of the Frame Mode Register FSLEN field.
          */
-        bits = 16;
-        dma_params->pdc_xfer_size = 2;
+        if ((ssc_p->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) == SND_SOC_DAIFMT_I2S
+                && bits > 16) {
+                printk(KERN_WARNING
+                        "at91-ssc: sample size %d is too large for I2S\n", bits);
+                return -EINVAL;
+        }
 
         /*
          * Compute SSC register settings.
          */
-        switch (ssc_p->daifmt) {
-        case SND_SOC_DAIFMT_CBS_CFS:
+        switch (ssc_p->daifmt
+                & (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_MASTER_MASK)) {
+
+        case SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS:
                 /*
-                 * SSC provides BCLK and LRC clocks.
+                 * I2S format, SSC provides BCLK and LRC clocks.
                  *
                  * The SSC transmit and receive clocks are generated from the
                  * MCK divider, and the BCLK signal is output on the SSC TK line.
@@ -441,10 +469,9 @@ static int at91_i2s_hw_params(struct snd_pcm_substream *substream,
                         | (((bits - 1)                  <<  0) & AT91_SSC_DATALEN);
                 break;
 
-        case SND_SOC_DAIFMT_CBM_CFM:
-
+        case SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM:
                 /*
-                 * CODEC supplies BCLK and LRC clocks.
+                 * I2S format, CODEC supplies BCLK and LRC clocks.
                  *
                  * The SSC transmit clock is obtained from the BCLK signal on
                  * on the TK line, and the SSC receive clock is generated from the
@@ -490,10 +517,51 @@ static int at91_i2s_hw_params(struct snd_pcm_substream *substream,
                         | (((bits - 1)                  <<  0) & AT91_SSC_DATALEN);
                 break;
 
-        case SND_SOC_DAIFMT_CBS_CFM:
-        case SND_SOC_DAIFMT_CBM_CFS:
+        case SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_CBS_CFS:
+                /*
+                 * DSP/PCM Mode A format, SSC provides BCLK and LRC clocks.
+                 *
+                 * The SSC transmit and receive clocks are generated from the
+                 * MCK divider, and the BCLK signal is output on the SSC TK line.
+                 */
+                rcmr =    (( ssc_p->rcmr_period         << 24) & AT91_SSC_PERIOD)
+                        | (( 1                          << 16) & AT91_SSC_STTDLY)
+                        | (( AT91_SSC_START_RISING_RF        ) & AT91_SSC_START)
+                        | (( AT91_SSC_CK_RISING              ) & AT91_SSC_CKI)
+                        | (( AT91_SSC_CKO_NONE               ) & AT91_SSC_CKO)
+                        | (( AT91_SSC_CKS_DIV                ) & AT91_SSC_CKS);
+
+                rfmr =    (( AT91_SSC_FSEDGE_POSITIVE        ) & AT91_SSC_FSEDGE)
+                        | (( AT91_SSC_FSOS_POSITIVE          ) & AT91_SSC_FSOS)
+                        | (( 0                          << 16) & AT91_SSC_FSLEN)
+                        | (((channels - 1)              <<  8) & AT91_SSC_DATNB)
+                        | (( 1                          <<  7) & AT91_SSC_MSBF)
+                        | (( 0                          <<  5) & AT91_SSC_LOOP)
+                        | (((bits - 1)                  <<  0) & AT91_SSC_DATALEN);
+
+                tcmr =    (( ssc_p->tcmr_period         << 24) & AT91_SSC_PERIOD)
+                        | (( 1                          << 16) & AT91_SSC_STTDLY)
+                        | (( AT91_SSC_START_RISING_RF        ) & AT91_SSC_START)
+                        | (( AT91_SSC_CK_RISING              ) & AT91_SSC_CKI)
+                        | (( AT91_SSC_CKO_CONTINUOUS         ) & AT91_SSC_CKO)
+                        | (( AT91_SSC_CKS_DIV                ) & AT91_SSC_CKS);
+
+                tfmr =    (( AT91_SSC_FSEDGE_POSITIVE        ) & AT91_SSC_FSEDGE)
+                        | (( 0                          << 23) & AT91_SSC_FSDEN)
+                        | (( AT91_SSC_FSOS_POSITIVE          ) & AT91_SSC_FSOS)
+                        | (( 0                          << 16) & AT91_SSC_FSLEN)
+                        | (((channels - 1)              <<  8) & AT91_SSC_DATNB)
+                        | (( 1                          <<  7) & AT91_SSC_MSBF)
+                        | (( 0                          <<  5) & AT91_SSC_DATDEF)
+                        | (((bits - 1)                  <<  0) & AT91_SSC_DATALEN);
+
+
+
+                        break;
+
+        case SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_CBM_CFM:
         default:
-                printk(KERN_WARNING "at91-i2s: unsupported DAI format 0x%x.\n",
+                printk(KERN_WARNING "at91-ssc: unsupported DAI format 0x%x.\n",
                         ssc_p->daifmt);
                 return -EINVAL;
                 break;
@@ -518,9 +586,9 @@ static int at91_i2s_hw_params(struct snd_pcm_substream *substream,
                 at91_ssc_write(ssc_p->ssc.base + ATMEL_PDC_TNPR, 0);
                 at91_ssc_write(ssc_p->ssc.base + ATMEL_PDC_TNCR, 0);
 
-                if ((ret = request_irq(ssc_p->ssc.pid, at91_i2s_interrupt,
+                if ((ret = request_irq(ssc_p->ssc.pid, at91_ssc_interrupt,
                                         0, ssc_p->name, ssc_p)) < 0) {
-                        printk(KERN_WARNING "at91-i2s: request_irq failure\n");
+                        printk(KERN_WARNING "at91-ssc: request_irq failure\n");
 
                         DBG("Stopping pid %d clock\n", ssc_p->ssc.pid);
                         at91_sys_write(AT91_PMC_PCER, 1<<ssc_p->ssc.pid);
@@ -546,7 +614,7 @@ static int at91_i2s_hw_params(struct snd_pcm_substream *substream,
 }
 
 
-static int at91_i2s_prepare(struct snd_pcm_substream *substream)
+static int at91_ssc_prepare(struct snd_pcm_substream *substream)
 {
         struct snd_soc_pcm_runtime *rtd = substream->private_data;
         struct at91_ssc_info *ssc_p = &ssc_info[rtd->dai->cpu_dai->id];
@@ -566,7 +634,7 @@ static int at91_i2s_prepare(struct snd_pcm_substream *substream)
 
 
 #ifdef CONFIG_PM
-static int at91_i2s_suspend(struct platform_device *pdev,
+static int at91_ssc_suspend(struct platform_device *pdev,
         struct snd_soc_cpu_dai *cpu_dai)
 {
         struct at91_ssc_info *ssc_p;
@@ -594,7 +662,7 @@ static int at91_i2s_suspend(struct platform_device *pdev,
         return 0;
 }
 
-static int at91_i2s_resume(struct platform_device *pdev,
+static int at91_ssc_resume(struct platform_device *pdev,
         struct snd_soc_cpu_dai *cpu_dai)
 {
         struct at91_ssc_info *ssc_p;
@@ -620,102 +688,105 @@ static int at91_i2s_resume(struct platform_device *pdev,
 }
 
 #else
-#define at91_i2s_suspend        NULL
-#define at91_i2s_resume         NULL
+#define at91_ssc_suspend        NULL
+#define at91_ssc_resume         NULL
 #endif
 
-#define AT91_I2S_RATES (SNDRV_PCM_RATE_8000  | SNDRV_PCM_RATE_11025 |\
+#define AT91_SSC_RATES (SNDRV_PCM_RATE_8000  | SNDRV_PCM_RATE_11025 |\
                         SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
                         SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
                         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |\
                         SNDRV_PCM_RATE_96000)
 
-struct snd_soc_cpu_dai at91_i2s_dai[NUM_SSC_DEVICES] = {
-        {       .name = "at91_ssc0/i2s",
+#define AT91_SSC_FORMATS (SNDRV_PCM_FMTBIT_S8     | SNDRV_PCM_FMTBIT_S16_LE |\
+                          SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
+
+struct snd_soc_cpu_dai at91_ssc_dai[NUM_SSC_DEVICES] = {
+        {       .name = "at91-ssc0",
                 .id = 0,
-                .type = SND_SOC_DAI_I2S,
-                .suspend = at91_i2s_suspend,
-                .resume = at91_i2s_resume,
+                .type = SND_SOC_DAI_PCM,
+                .suspend = at91_ssc_suspend,
+                .resume = at91_ssc_resume,
                 .playback = {
                         .channels_min = 1,
                         .channels_max = 2,
-                        .rates = AT91_I2S_RATES,
-                        .formats = SNDRV_PCM_FMTBIT_S16_LE,},
+                        .rates = AT91_SSC_RATES,
+                        .formats = AT91_SSC_FORMATS,},
                 .capture = {
                         .channels_min = 1,
                         .channels_max = 2,
-                        .rates = AT91_I2S_RATES,
-                        .formats = SNDRV_PCM_FMTBIT_S16_LE,},
+                        .rates = AT91_SSC_RATES,
+                        .formats = AT91_SSC_FORMATS,},
                 .ops = {
-                        .startup = at91_i2s_startup,
-                        .shutdown = at91_i2s_shutdown,
-                        .prepare = at91_i2s_prepare,
-                        .hw_params = at91_i2s_hw_params,},
+                        .startup = at91_ssc_startup,
+                        .shutdown = at91_ssc_shutdown,
+                        .prepare = at91_ssc_prepare,
+                        .hw_params = at91_ssc_hw_params,},
                 .dai_ops = {
-                        .set_sysclk = at91_i2s_set_dai_sysclk,
-                        .set_fmt = at91_i2s_set_dai_fmt,
-                        .set_clkdiv = at91_i2s_set_dai_clkdiv,},
+                        .set_sysclk = at91_ssc_set_dai_sysclk,
+                        .set_fmt = at91_ssc_set_dai_fmt,
+                        .set_clkdiv = at91_ssc_set_dai_clkdiv,},
                 .private_data = &ssc_info[0].ssc,
         },
 #if NUM_SSC_DEVICES == 3
-        {       .name = "at91_ssc1/i2s",
+        {       .name = "at91-ssc1",
                 .id = 1,
-                .type = SND_SOC_DAI_I2S,
-                .suspend = at91_i2s_suspend,
-                .resume = at91_i2s_resume,
+                .type = SND_SOC_DAI_PCM,
+                .suspend = at91_ssc_suspend,
+                .resume = at91_ssc_resume,
                 .playback = {
                         .channels_min = 1,
                         .channels_max = 2,
-                        .rates = AT91_I2S_RATES,
-                        .formats = SNDRV_PCM_FMTBIT_S16_LE,},
+                        .rates = AT91_SSC_RATES,
+                        .formats = AT91_SSC_FORMATS,},
                 .capture = {
                         .channels_min = 1,
                         .channels_max = 2,
-                        .rates = AT91_I2S_RATES,
-                        .formats = SNDRV_PCM_FMTBIT_S16_LE,},
+                        .rates = AT91_SSC_RATES,
+                        .formats = AT91_SSC_FORMATS,},
                 .ops = {
-                        .startup = at91_i2s_startup,
-                        .shutdown = at91_i2s_shutdown,
-                        .prepare = at91_i2s_prepare,
-                        .hw_params = at91_i2s_hw_params,},
+                        .startup = at91_ssc_startup,
+                        .shutdown = at91_ssc_shutdown,
+                        .prepare = at91_ssc_prepare,
+                        .hw_params = at91_ssc_hw_params,},
                 .dai_ops = {
-                        .set_sysclk = at91_i2s_set_dai_sysclk,
-                        .set_fmt = at91_i2s_set_dai_fmt,
-                        .set_clkdiv = at91_i2s_set_dai_clkdiv,},
+                        .set_sysclk = at91_ssc_set_dai_sysclk,
+                        .set_fmt = at91_ssc_set_dai_fmt,
+                        .set_clkdiv = at91_ssc_set_dai_clkdiv,},
                 .private_data = &ssc_info[1].ssc,
         },
-        {       .name = "at91_ssc2/i2s",
+        {       .name = "at91-ssc2",
                 .id = 2,
-                .type = SND_SOC_DAI_I2S,
-                .suspend = at91_i2s_suspend,
-                .resume = at91_i2s_resume,
+                .type = SND_SOC_DAI_PCM,
+                .suspend = at91_ssc_suspend,
+                .resume = at91_ssc_resume,
                 .playback = {
                         .channels_min = 1,
                         .channels_max = 2,
-                        .rates = AT91_I2S_RATES,
-                        .formats = SNDRV_PCM_FMTBIT_S16_LE,},
+                        .rates = AT91_SSC_RATES,
+                        .formats = AT91_SSC_FORMATS,},
                 .capture = {
                         .channels_min = 1,
                         .channels_max = 2,
-                        .rates = AT91_I2S_RATES,
-                        .formats = SNDRV_PCM_FMTBIT_S16_LE,},
+                        .rates = AT91_SSC_RATES,
+                        .formats = AT91_SSC_FORMATS,},
                 .ops = {
-                        .startup = at91_i2s_startup,
-                        .shutdown = at91_i2s_shutdown,
-                        .prepare = at91_i2s_prepare,
-                        .hw_params = at91_i2s_hw_params,},
+                        .startup = at91_ssc_startup,
+                        .shutdown = at91_ssc_shutdown,
+                        .prepare = at91_ssc_prepare,
+                        .hw_params = at91_ssc_hw_params,},
                 .dai_ops = {
-                        .set_sysclk = at91_i2s_set_dai_sysclk,
-                        .set_fmt = at91_i2s_set_dai_fmt,
-                        .set_clkdiv = at91_i2s_set_dai_clkdiv,},
+                        .set_sysclk = at91_ssc_set_dai_sysclk,
+                        .set_fmt = at91_ssc_set_dai_fmt,
+                        .set_clkdiv = at91_ssc_set_dai_clkdiv,},
                 .private_data = &ssc_info[2].ssc,
         },
 #endif
 };
 
-EXPORT_SYMBOL_GPL(at91_i2s_dai);
+EXPORT_SYMBOL_GPL(at91_ssc_dai);
 
 /* Module information */
 MODULE_AUTHOR("Frank Mandarino, fmandarino@endrelia.com, www.endrelia.com");
-MODULE_DESCRIPTION("AT91 I2S ASoC Interface");
+MODULE_DESCRIPTION("AT91 SSC ASoC Interface");
 MODULE_LICENSE("GPL");
diff --git a/sound/soc/at91/at91-i2s.h b/sound/soc/at91/at91-ssc.h
index f8a875ba0ccc..b188f973df9f 100644
--- a/sound/soc/at91/at91-i2s.h
+++ b/sound/soc/at91/at91-ssc.h
@@ -1,5 +1,5 @@
 /*
- * at91-i2s.h - ALSA I2S interface for the Atmel AT91 SoC
+ * at91-ssc.h - ALSA SSC interface for the Atmel AT91 SoC
  *
  * Author:      Frank Mandarino <fmandarino@endrelia.com>
  *              Endrelia Technologies Inc.
@@ -10,18 +10,18 @@
  * published by the Free Software Foundation.
  */
 
-#ifndef _AT91_I2S_H
-#define _AT91_I2S_H
+#ifndef _AT91_SSC_H
+#define _AT91_SSC_H
 
-/* I2S system clock ids */
+/* SSC system clock ids */
 #define AT91_SYSCLK_MCK         0 /* SSC uses AT91 MCK as system clock */
 
-/* I2S divider ids */
+/* SSC divider ids */
 #define AT91SSC_CMR_DIV         0 /* MCK divider for BCLK */
 #define AT91SSC_TCMR_PERIOD     1 /* BCLK divider for transmit FS */
 #define AT91SSC_RCMR_PERIOD     2 /* BCLK divider for receive FS */
 
-extern struct snd_soc_cpu_dai at91_i2s_dai[];
+extern struct snd_soc_cpu_dai at91_ssc_dai[];
 
-#endif /* _AT91_I2S_H */
+#endif /* _AT91_SSC_H */