ASoC: Parse board ID/revision information from WM1250-EV1 board

The WM1250-EV1 board has an ID chip on it, check the board ID and display
the board revision during startup.

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

diff --git a/sound/soc/codecs/wm1250-ev1.c b/sound/soc/codecs/wm1250-ev1.c
index bcc208967917f149956985e7c8f5c290a1506aad..bbcf9ec34759edba6629c64cc1f6e35885a2cab3 100644 (file)
--- a/sound/soc/codecs/wm1250-ev1.c
+++ b/sound/soc/codecs/wm1250-ev1.c
@@ -56,8 +56,26 @@ static struct snd_soc_codec_driver soc_codec_dev_wm1250_ev1 = {
 };
 
 static int __devinit wm1250_ev1_probe(struct i2c_client *i2c,
-                                     const struct i2c_device_id *id)
+                                     const struct i2c_device_id *i2c_id)
 {
+       int ret, id, board, rev;
+
+       board = i2c_smbus_read_byte_data(i2c, 0);
+       if (board < 0) {
+               dev_err(&i2c->dev, "Failed to read ID: %d\n", ret);
+               return ret;
+       }
+
+       id = (board & 0xfe) >> 2;
+       rev = board & 0x3;
+
+       if (id != 1) {
+               dev_err(&i2c->dev, "Unknown board ID %d\n", id);
+               return -ENODEV;
+       }
+
+       dev_info(&i2c->dev, "revision %d\n", rev);
+
        return snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm1250_ev1,
                                      &wm1250_ev1_dai, 1);
 }