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ASoC: Warn if WM8903 platform data is used to enable microphone IRQ

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The WM8903 interrupts are clear on read so if the WM8903 detection is
enabled from platform data when the IRQ is in use (rather than using a
direct signal from a GPIO) status may be lost during startup. Help users
spot this misconfiguration by adding a WARN_ON().

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Mark Brown 2011-02-11 14:39:13 +00:00
parent 8eb34207c8
commit 905f6952c5
1 changed files with 22 additions and 0 deletions
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22
sound/soc/codecs/wm8903.c
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@ -1917,12 +1917,26 @@ static int wm8903_probe(struct snd_soc_codec *codec)
/* Set up GPIOs and microphone detection */
if (pdata) {
bool mic_gpio = false;
for (i = 0; i < ARRAY_SIZE(pdata->gpio_cfg); i++) {
if (pdata->gpio_cfg[i] == WM8903_GPIO_NO_CONFIG)
continue;
snd_soc_write(codec, WM8903_GPIO_CONTROL_1 + i,
pdata->gpio_cfg[i] & 0xffff);
val = (pdata->gpio_cfg[i] & WM8903_GP1_FN_MASK)
>> WM8903_GP1_FN_SHIFT;
switch (val) {
case WM8903_GPn_FN_MICBIAS_CURRENT_DETECT:
case WM8903_GPn_FN_MICBIAS_SHORT_DETECT:
mic_gpio = true;
break;
default:
break;
}
}
snd_soc_write(codec, WM8903_MIC_BIAS_CONTROL_0,
@ -1933,6 +1947,14 @@ static int wm8903_probe(struct snd_soc_codec *codec)
snd_soc_update_bits(codec, WM8903_WRITE_SEQUENCER_0,
WM8903_WSEQ_ENA, WM8903_WSEQ_ENA);
/* If microphone detection is enabled by pdata but
* detected via IRQ then interrupts can be lost before
* the machine driver has set up microphone detection
* IRQs as the IRQs are clear on read. The detection
* will be enabled when the machine driver configures.
*/
WARN_ON(!mic_gpio && (pdata->micdet_cfg & WM8903_MICDET_ENA));
wm8903->mic_delay = pdata->micdet_delay;
}