summaryrefslogtreecommitdiff
path: root/sound/soc/s3c24xx/s3c2412-i2s.c
diff options
context:
space:
mode:
authorBen Dooks <ben-linux@fluff.org>2008-01-10 14:48:37 +0100
committerJaroslav Kysela <perex@perex.cz>2008-01-31 17:29:53 +0100
commit6cab2d3ddd54f2ef4872a4fca3d44655377737dd (patch)
tree94606e1ce47773315c7165c566221ec94c4b2ffd /sound/soc/s3c24xx/s3c2412-i2s.c
parent49646dfa2ae81e770da1c12c4fce227062ce4612 (diff)
[ALSA] S3C2412: suspend and resume support
Support for suspend/resume for the S3C2412 ASoC IIS core driver. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Diffstat (limited to 'sound/soc/s3c24xx/s3c2412-i2s.c')
-rw-r--r--sound/soc/s3c24xx/s3c2412-i2s.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/sound/soc/s3c24xx/s3c2412-i2s.c b/sound/soc/s3c24xx/s3c2412-i2s.c
index b10f7ffa9424..c4a46dd589b3 100644
--- a/sound/soc/s3c24xx/s3c2412-i2s.c
+++ b/sound/soc/s3c24xx/s3c2412-i2s.c
@@ -79,6 +79,10 @@ struct s3c2412_i2s_info {
struct clk *iis_clk;
struct clk *iis_pclk;
struct clk *iis_cclk;
+
+ u32 suspend_iismod;
+ u32 suspend_iiscon;
+ u32 suspend_iispsr;
};
static struct s3c2412_i2s_info s3c2412_i2s;
@@ -641,6 +645,63 @@ static int s3c2412_i2s_probe(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_PM
+static int s3c2412_i2s_suspend(struct platform_device *dev,
+ struct snd_soc_cpu_dai *dai)
+{
+ struct s3c2412_i2s_info *i2s = &s3c2412_i2s;
+ u32 iismod;
+
+ if (dai->active) {
+ i2s->suspend_iismod = readl(i2s->regs + S3C2412_IISMOD);
+ i2s->suspend_iiscon = readl(i2s->regs + S3C2412_IISCON);
+ i2s->suspend_iispsr = readl(i2s->regs + S3C2412_IISPSR);
+
+ /* some basic suspend checks */
+
+ iismod = readl(i2s->regs + S3C2412_IISMOD);
+
+ if (iismod & S3C2412_IISCON_RXDMA_ACTIVE)
+ dev_warn(&dev->dev, "%s: RXDMA active?\n", __func__);
+
+ if (iismod & S3C2412_IISCON_TXDMA_ACTIVE)
+ dev_warn(&dev->dev, "%s: TXDMA active?\n", __func__);
+
+ if (iismod & S3C2412_IISCON_IIS_ACTIVE)
+ dev_warn(&dev->dev, "%s: IIS active\n", __func__);
+ }
+
+ return 0;
+}
+
+static int s3c2412_i2s_resume(struct platform_device *pdev,
+ struct snd_soc_cpu_dai *dai)
+{
+ struct s3c2412_i2s_info *i2s = &s3c2412_i2s;
+
+ dev_info(&pdev->dev, "dai_active %d, IISMOD %08x, IISCON %08x\n",
+ dai->active, i2s->suspend_iismod, i2s->suspend_iiscon);
+
+ if (dai->active) {
+ writel(i2s->suspend_iiscon, i2s->regs + S3C2412_IISCON);
+ writel(i2s->suspend_iismod, i2s->regs + S3C2412_IISMOD);
+ writel(i2s->suspend_iispsr, i2s->regs + S3C2412_IISPSR);
+
+ writel(S3C2412_IISFIC_RXFLUSH | S3C2412_IISFIC_TXFLUSH,
+ i2s->regs + S3C2412_IISFIC);
+
+ ndelay(250);
+ writel(0x0, i2s->regs + S3C2412_IISFIC);
+
+ }
+
+ return 0;
+}
+#else
+#define s3c2412_i2s_suspend NULL
+#define s3c2412_i2s_resume NULL
+#endif /* CONFIG_PM */
+
#define S3C2412_I2S_RATES \
(SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
@@ -651,6 +712,8 @@ struct snd_soc_cpu_dai s3c2412_i2s_dai = {
.id = 0,
.type = SND_SOC_DAI_I2S,
.probe = s3c2412_i2s_probe,
+ .suspend = s3c2412_i2s_suspend,
+ .resume = s3c2412_i2s_resume,
.playback = {
.channels_min = 2,
.channels_max = 2,