[ALSA] PM support for cs5535audio
Appended is my patch adding PM support to the cs5535audio driver.
I also added the ac97 quirk but it's not yet confirmed which
boards need to be in the quirk list. The patch also includes some
Kconfig and misc cleanup.
Signed-off-by: Jaya Kumar <jayakumar.alsa@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/cs5535audio/cs5535audio_pm.c b/sound/pci/cs5535audio/cs5535audio_pm.c
new file mode 100644
index 0000000..aad0e69
--- /dev/null
+++ b/sound/pci/cs5535audio/cs5535audio_pm.c
@@ -0,0 +1,123 @@
+/*
+ * Power management for audio on multifunction CS5535 companion device
+ * Copyright (C) Jaya Kumar
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <sound/driver.h>
+#include <sound/core.h>
+#include <sound/control.h>
+#include <sound/initval.h>
+#include <sound/asoundef.h>
+#include <sound/pcm.h>
+#include <sound/ac97_codec.h>
+#include "cs5535audio.h"
+
+static void snd_cs5535audio_stop_hardware(struct cs5535audio *cs5535au)
+{
+ /*
+ we depend on snd_ac97_suspend to tell the
+ AC97 codec to shutdown. the amd spec suggests
+ that the LNK_SHUTDOWN be done at the same time
+ that the codec power-down is issued. instead,
+ we do it just after rather than at the same
+ time. excluding codec specific build_ops->suspend
+ ac97 powerdown hits:
+ 0x8000 EAPD
+ 0x4000 Headphone amplifier
+ 0x0300 ADC & DAC
+ 0x0400 Analog Mixer powerdown (Vref on)
+ I am not sure if this is the best that we can do.
+ The remainder to be investigated are:
+ - analog mixer (vref off) 0x0800
+ - AC-link powerdown 0x1000
+ - codec internal clock 0x2000
+ */
+
+ /* set LNK_SHUTDOWN to shutdown AC link */
+ cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_SHUTDOWN);
+
+}
+
+int snd_cs5535audio_suspend(struct pci_dev *pci, pm_message_t state)
+{
+ struct snd_card *card = pci_get_drvdata(pci);
+ struct cs5535audio *cs5535au = card->private_data;
+ int i;
+
+ snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
+ for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {
+ struct cs5535audio_dma *dma = &cs5535au->dmas[i];
+ if (dma && dma->substream && !dma->suspended)
+ dma->saved_prd = dma->ops->read_prd(cs5535au);
+ }
+ snd_pcm_suspend_all(cs5535au->pcm);
+ snd_ac97_suspend(cs5535au->ac97);
+ /* save important regs, then disable aclink in hw */
+ snd_cs5535audio_stop_hardware(cs5535au);
+ pci_disable_device(pci);
+ pci_save_state(pci);
+
+ return 0;
+}
+
+int snd_cs5535audio_resume(struct pci_dev *pci)
+{
+ struct snd_card *card = pci_get_drvdata(pci);
+ struct cs5535audio *cs5535au = card->private_data;
+ u32 tmp;
+ int timeout;
+ int i;
+
+ pci_restore_state(pci);
+ pci_enable_device(pci);
+ pci_set_master(pci);
+
+ /* set LNK_WRM_RST to reset AC link */
+ cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_WRM_RST);
+
+ timeout = 50;
+ do {
+ tmp = cs_readl(cs5535au, ACC_CODEC_STATUS);
+ if (tmp & PRM_RDY_STS)
+ break;
+ udelay(1);
+ } while (--timeout);
+
+ if (!timeout)
+ snd_printk(KERN_ERR "Failure getting AC Link ready\n");
+
+ /* we depend on ac97 to perform the codec power up */
+ snd_ac97_resume(cs5535au->ac97);
+ /* set up rate regs, dma. actual initiation is done in trig */
+ for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {
+ struct cs5535audio_dma *dma = &cs5535au->dmas[i];
+ if (dma && dma->substream && dma->suspended) {
+ dma->substream->ops->prepare(dma->substream);
+ dma->ops->setup_prd(cs5535au, dma->saved_prd);
+ }
+ }
+
+ snd_power_change_state(card, SNDRV_CTL_POWER_D0);
+
+ return 0;
+}
+