1 files changed, 123 insertions, 0 deletions

diff --git a/sound/pci/cs5535audio/cs5535audio_pm.c b/sound/pci/cs5535audio/cs5535audio_pm.c
new file mode 100644
index 000000000000..aad0e69db9c1
--- /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;
+}
+