- struct snd_soc_device *socdev = cs4270_socdev;
- struct snd_soc_codec *codec = socdev->codec;
- int i;
- int ret = 0;
-
- /* Probing all possible addresses has one drawback: if there are
- multiple CS4270s on the bus, then you cannot specify which
- socdev is matched with which CS4270. For now, we just reject
- this I2C device if the socdev already has one attached. */
- if (codec->control_data)
- return -ENODEV;
-
- /* Note: codec_dai->codec is NULL here */
-
- codec->reg_cache = kzalloc(CS4270_NUMREGS, GFP_KERNEL);
- if (!codec->reg_cache) {
- printk(KERN_ERR "cs4270: could not allocate register cache\n");
- ret = -ENOMEM;
- goto error;
- }
-
- /* Verify that we have a CS4270 */
-
- ret = i2c_smbus_read_byte_data(i2c_client, CS4270_CHIPID);
- if (ret < 0) {
- printk(KERN_ERR "cs4270: failed to read I2C\n");
- goto error;
- }
- /* The top four bits of the chip ID should be 1100. */
- if ((ret & 0xF0) != 0xC0) {
- /* The device at this address is not a CS4270 codec */
- ret = -ENODEV;
- goto error;
- }
-
- printk(KERN_INFO "cs4270: found device at I2C address %X\n",
- i2c_client->addr);
- printk(KERN_INFO "cs4270: hardware revision %X\n", ret & 0xF);
-
- codec->control_data = i2c_client;
- codec->read = cs4270_read_reg_cache;
- codec->write = cs4270_i2c_write;
- codec->reg_cache_size = CS4270_NUMREGS;