ASoC: support sample sizes properly in the WM8776 codec driver

Use snd_pcm_format_width() to determine the sample size, instead of
checking specify sample formats and assuming that those are the only
valid format.

This change adds support for big-endian architectures (which use the _BE
formats) and the packed 24-bit format (SNDRV_PCM_FORMAT_S24_3xE).

[Fixed single letter variable name legibility problem -- broonie]

Signed-off-by: Timur Tabi <timur@freescale.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 13 insertions, 12 deletions

diff --git a/sound/soc/codecs/wm8776.c b/sound/soc/codecs/wm8776.c
index 0cfbfc1dc093..5b17627aab0f 100644
--- a/sound/soc/codecs/wm8776.c
+++ b/sound/soc/codecs/wm8776.c
@@ -216,8 +216,6 @@ static int wm8776_hw_params(struct snd_pcm_substream *substream,
         int ratio_shift, master;
         int i;
 
-        iface = 0;
-
         switch (dai->driver->id) {
         case WM8776_DAI_DAC:
                 iface_reg = WM8776_DACIFCTRL;
@@ -233,20 +231,23 @@ static int wm8776_hw_params(struct snd_pcm_substream *substream,
                 return -EINVAL;
         }
 
-
         /* Set word length */
-        switch (params_format(params)) {
-        case SNDRV_PCM_FORMAT_S16_LE:
+        switch (snd_pcm_format_width(params_format(params))) {
+        case 16:
+                iface = 0;
+        case 20:
+                iface = 0x10;
                 break;
-        case SNDRV_PCM_FORMAT_S20_3LE:
-                iface |= 0x10;
+        case 24:
+                iface = 0x20;
                 break;
-        case SNDRV_PCM_FORMAT_S24_LE:
-                iface |= 0x20;
-                break;
-        case SNDRV_PCM_FORMAT_S32_LE:
-                iface |= 0x30;
+        case 32:
+                iface = 0x30;
                 break;
+        default:
+                dev_err(codec->dev, "Unsupported sample size: %i\n",
+                        snd_pcm_format_width(params_format(params)));
+                return -EINVAL;
         }
 
         /* Only need to set MCLK/LRCLK ratio if we're master */