ALSA: Echoaudio - Add suspend support #2

This patch adds rearranges parts of the initialization code and adds
suspend and resume callbacks.

This patch adds suspend and resume callbacks.
It also rearranges parts of the initialization code so it can be
used in both the first initialization (when the module is loaded we
also have to load default settings) and the resume callback (where
we have to restore the previous settings).

Signed-off-by: Giuliano Pochini <pochini@shiny.it>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 138 insertions, 15 deletions

diff --git a/sound/pci/echoaudio/echoaudio.c b/sound/pci/echoaudio/echoaudio.c
index 79dde9592847..2783ce6c236e 100644
--- a/sound/pci/echoaudio/echoaudio.c
+++ b/sound/pci/echoaudio/echoaudio.c
@@ -753,6 +753,8 @@ static int pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 
         spin_lock(&chip->lock);
         switch (cmd) {
+        case SNDRV_PCM_TRIGGER_RESUME:
+                DE_ACT(("pcm_trigger resume\n"));
         case SNDRV_PCM_TRIGGER_START:
         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
                 DE_ACT(("pcm_trigger start\n"));
@@ -776,6 +778,8 @@ static int pcm_trigger(struct snd_pcm_substream *substream, int cmd)
                 err = start_transport(chip, channelmask,
                                       chip->pipe_cyclic_mask);
                 break;
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+                DE_ACT(("pcm_trigger suspend\n"));
         case SNDRV_PCM_TRIGGER_STOP:
                 DE_ACT(("pcm_trigger stop\n"));
                 for (i = 0; i < DSP_MAXPIPES; i++) {
@@ -1951,18 +1955,27 @@ static __devinit int snd_echo_create(struct snd_card *card,
                 return err;
         pci_set_master(pci);
 
-        /* allocate a chip-specific data */
-        chip = kzalloc(sizeof(*chip), GFP_KERNEL);
-        if (!chip) {
-                pci_disable_device(pci);
-                return -ENOMEM;
+        /* Allocate chip if needed */
+        if (!*rchip) {
+                chip = kzalloc(sizeof(*chip), GFP_KERNEL);
+                if (!chip) {
+                        pci_disable_device(pci);
+                        return -ENOMEM;
+                }
+                DE_INIT(("chip=%p\n", chip));
+                spin_lock_init(&chip->lock);
+                chip->card = card;
+                chip->pci = pci;
+                chip->irq = -1;
+                atomic_set(&chip->opencount, 0);
+                mutex_init(&chip->mode_mutex);
+                chip->can_set_rate = 1;
+        } else {
+                /* If this was called from the resume function, chip is
+                 * already allocated and it contains current card settings.
+                 */
+                chip = *rchip;
         }
-        DE_INIT(("chip=%p\n", chip));
-
-        spin_lock_init(&chip->lock);
-        chip->card = card;
-        chip->pci = pci;
-        chip->irq = -1;
 
         /* PCI resource allocation */
         chip->dsp_registers_phys = pci_resource_start(pci, 0);
@@ -2002,7 +2015,9 @@ static __devinit int snd_echo_create(struct snd_card *card,
         chip->comm_page = (struct comm_page *)chip->commpage_dma_buf.area;
 
         err = init_hw(chip, chip->pci->device, chip->pci->subsystem_device);
-        if (err) {
+        if (err >= 0)
+                err = set_mixer_defaults(chip);
+        if (err < 0) {
                 DE_INIT(("init_hw err=%d\n", err));
                 snd_echo_free(chip);
                 return err;
@@ -2013,9 +2028,6 @@ static __devinit int snd_echo_create(struct snd_card *card,
                 snd_echo_free(chip);
                 return err;
         }
-        atomic_set(&chip->opencount, 0);
-        mutex_init(&chip->mode_mutex);
-        chip->can_set_rate = 1;
         *rchip = chip;
         /* Init done ! */
         return 0;
@@ -2048,6 +2060,7 @@ static int __devinit snd_echo_probe(struct pci_dev *pci,
 
         snd_card_set_dev(card, &pci->dev);
 
+        chip = NULL;    /* Tells snd_echo_create to allocate chip */
         if ((err = snd_echo_create(card, pci, &chip)) < 0) {
                 snd_card_free(card);
                 return err;
@@ -2187,6 +2200,112 @@ ctl_error:
 
 
 
+#if defined(CONFIG_PM)
+
+static int snd_echo_suspend(struct pci_dev *pci, pm_message_t state)
+{
+        struct echoaudio *chip = pci_get_drvdata(pci);
+
+        DE_INIT(("suspend start\n"));
+        snd_pcm_suspend_all(chip->analog_pcm);
+        snd_pcm_suspend_all(chip->digital_pcm);
+
+#ifdef ECHOCARD_HAS_MIDI
+        /* This call can sleep */
+        if (chip->midi_out)
+                snd_echo_midi_output_trigger(chip->midi_out, 0);
+#endif
+        spin_lock_irq(&chip->lock);
+        if (wait_handshake(chip)) {
+                spin_unlock_irq(&chip->lock);
+                return -EIO;
+        }
+        clear_handshake(chip);
+        if (send_vector(chip, DSP_VC_GO_COMATOSE) < 0) {
+                spin_unlock_irq(&chip->lock);
+                return -EIO;
+        }
+        spin_unlock_irq(&chip->lock);
+
+        chip->dsp_code = NULL;
+        free_irq(chip->irq, chip);
+        chip->irq = -1;
+        pci_save_state(pci);
+        pci_disable_device(pci);
+
+        DE_INIT(("suspend done\n"));
+        return 0;
+}
+
+
+
+static int snd_echo_resume(struct pci_dev *pci)
+{
+        struct echoaudio *chip = pci_get_drvdata(pci);
+        struct comm_page *commpage, *commpage_bak;
+        u32 pipe_alloc_mask;
+        int err;
+
+        DE_INIT(("resume start\n"));
+        pci_restore_state(pci);
+        commpage_bak = kmalloc(sizeof(struct echoaudio), GFP_KERNEL);
+        commpage = chip->comm_page;
+        memcpy(commpage_bak, commpage, sizeof(struct comm_page));
+
+        err = init_hw(chip, chip->pci->device, chip->pci->subsystem_device);
+        if (err < 0) {
+                kfree(commpage_bak);
+                DE_INIT(("resume init_hw err=%d\n", err));
+                snd_echo_free(chip);
+                return err;
+        }
+        DE_INIT(("resume init OK\n"));
+
+        /* Temporarily set chip->pipe_alloc_mask=0 otherwise
+         * restore_dsp_settings() fails.
+         */
+        pipe_alloc_mask = chip->pipe_alloc_mask;
+        chip->pipe_alloc_mask = 0;
+        err = restore_dsp_rettings(chip);
+        chip->pipe_alloc_mask = pipe_alloc_mask;
+        if (err < 0) {
+                kfree(commpage_bak);
+                return err;
+        }
+        DE_INIT(("resume restore OK\n"));
+
+        memcpy(&commpage->audio_format, &commpage_bak->audio_format,
+                sizeof(commpage->audio_format));
+        memcpy(&commpage->sglist_addr, &commpage_bak->sglist_addr,
+                sizeof(commpage->sglist_addr));
+        memcpy(&commpage->midi_output, &commpage_bak->midi_output,
+                sizeof(commpage->midi_output));
+        kfree(commpage_bak);
+
+        if (request_irq(pci->irq, snd_echo_interrupt, IRQF_SHARED,
+                        ECHOCARD_NAME, chip)) {
+                snd_echo_free(chip);
+                snd_printk(KERN_ERR "cannot grab irq\n");
+                return -EBUSY;
+        }
+        chip->irq = pci->irq;
+        DE_INIT(("resume irq=%d\n", chip->irq));
+
+#ifdef ECHOCARD_HAS_MIDI
+        if (chip->midi_input_enabled)
+                enable_midi_input(chip, TRUE);
+        if (chip->midi_out)
+                snd_echo_midi_output_trigger(chip->midi_out, 1);
+#endif
+
+        DE_INIT(("resume done\n"));
+        return 0;
+}
+
+#endif /* CONFIG_PM */
+
+
+
 static void __devexit snd_echo_remove(struct pci_dev *pci)
 {
         struct echoaudio *chip;
@@ -2209,6 +2328,10 @@ static struct pci_driver driver = {
         .id_table = snd_echo_ids,
         .probe = snd_echo_probe,
         .remove = __devexit_p(snd_echo_remove),
+#ifdef CONFIG_PM
+        .suspend = snd_echo_suspend,
+        .resume = snd_echo_resume,
+#endif /* CONFIG_PM */
 };