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ASoC: tlv320dac33: Error handling for broken chip 

Correct/Implement handling of broken chip.
Fail the soc_prope if the communication with the chip
fails (can not read chip ID).

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Peter Ujfalusi 2010-10-26 11:45:59 +03:00 committed by Liam Girdwood
parent 84eae18c86
commit 911a0f0bfc
1 changed files with 19 additions and 7 deletions
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26
sound/soc/codecs/tlv320dac33.c
View File

@ -200,7 +200,7 @@ static int dac33_read(struct snd_soc_codec *codec, unsigned int reg,
u8 *value)
{
struct tlv320dac33_priv *dac33 = snd_soc_codec_get_drvdata(codec);
int val;
int val, ret = 0;
*value = reg & 0xff;
@ -210,6 +210,7 @@ static int dac33_read(struct snd_soc_codec *codec, unsigned int reg,
if (val < 0) {
dev_err(codec->dev, "Read failed (%d)\n", val);
value[0] = dac33_read_reg_cache(codec, reg);
ret = val;
} else {
value[0] = val;
dac33_write_reg_cache(codec, reg, val);
@ -218,7 +219,7 @@ static int dac33_read(struct snd_soc_codec *codec, unsigned int reg,
value[0] = dac33_read_reg_cache(codec, reg);
}
return 0;
return ret;
}
static int dac33_write(struct snd_soc_codec *codec, unsigned int reg,
@ -329,13 +330,18 @@ static void dac33_init_chip(struct snd_soc_codec *codec)
dac33_read_reg_cache(codec, DAC33_LINER_TO_RLO_VOL));
}
static inline void dac33_read_id(struct snd_soc_codec *codec)
static inline int dac33_read_id(struct snd_soc_codec *codec)
{
int i, ret = 0;
u8 reg;
dac33_read(codec, DAC33_DEVICE_ID_MSB, &reg);
dac33_read(codec, DAC33_DEVICE_ID_LSB, &reg);
dac33_read(codec, DAC33_DEVICE_REV_ID, &reg);
for (i = 0; i < 3; i++) {
ret = dac33_read(codec, DAC33_DEVICE_ID_MSB + i, &reg);
if (ret < 0)
break;
}
return ret;
}
static inline void dac33_soft_power(struct snd_soc_codec *codec, int power)
@ -1414,9 +1420,15 @@ static int dac33_soc_probe(struct snd_soc_codec *codec)
dev_err(codec->dev, "Failed to power up codec: %d\n", ret);
goto err_power;
}
dac33_read_id(codec);
ret = dac33_read_id(codec);
dac33_hard_power(codec, 0);
if (ret < 0) {
dev_err(codec->dev, "Failed to read chip ID: %d\n", ret);
ret = -ENODEV;
goto err_power;
}
/* Check if the IRQ number is valid and request it */
if (dac33->irq >= 0) {
ret = request_irq(dac33->irq, dac33_interrupt_handler,