lkml.org 
[lkml]   [2001]   [Nov]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH] save sound mixer state over suspend

The appended patch introduces two new functions to the ac97_codec
handling: ac97_save_state() and ac97_restore_state().
These functions save/restore the mixer state over suspend. (So after
resume the volume is the same it was before)

As an example, I changed the ymfpci driver to use the new functionality -
works fine here.

--Kai

diff -ur linux-2.4.15-pre2/drivers/sound/ac97_codec.c linux-2.4.15-pre2.x/drivers/sound/ac97_codec.c
--- linux-2.4.15-pre2/drivers/sound/ac97_codec.c Sat Nov 10 19:08:12 2001
+++ linux-2.4.15-pre2.x/drivers/sound/ac97_codec.c Sun Nov 11 20:39:15 2001
@@ -1019,4 +1019,31 @@
}

EXPORT_SYMBOL(ac97_set_adc_rate);
+
+int ac97_save_state(struct ac97_codec *codec)
+{
+ return 0;
+}
+
+EXPORT_SYMBOL(ac97_save_state);
+
+int ac97_restore_state(struct ac97_codec *codec)
+{
+ int i;
+ unsigned int left, right, val;
+
+ for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
+ if (!supported_mixer(codec, i))
+ continue;
+
+ val = codec->mixer_state[i];
+ right = val >> 8;
+ left = val & 0xff;
+ codec->write_mixer(codec, i, left, right);
+ }
+ return 0;
+}
+
+EXPORT_SYMBOL(ac97_restore_state);
+
MODULE_LICENSE("GPL");
diff -ur linux-2.4.15-pre2/drivers/sound/ymfpci.c linux-2.4.15-pre2.x/drivers/sound/ymfpci.c
--- linux-2.4.15-pre2/drivers/sound/ymfpci.c Wed Oct 24 22:51:49 2001
+++ linux-2.4.15-pre2.x/drivers/sound/ymfpci.c Sun Nov 11 20:40:46 2001
@@ -1824,7 +1824,7 @@
}

unit = NULL; /* gcc warns */
- for (list = ymf_devs.next; list != &ymf_devs; list = list->next) {
+ list_for_each(list, &ymf_devs) {
unit = list_entry(list, ymfpci_t, ymf_devs);
if (((unit->dev_audio ^ minor) & ~0x0F) == 0)
break;
@@ -1935,7 +1935,7 @@
struct list_head *list;
ymfpci_t *unit;

- for (list = ymf_devs.next; list != &ymf_devs; list = list->next) {
+ list_for_each(list, &ymf_devs) {
unit = list_entry(list, ymfpci_t, ymf_devs);
for (i = 0; i < NR_AC97; i++) {
if (unit->ac97_codec[i] != NULL &&
@@ -1990,16 +1990,25 @@

static int ymf_suspend(struct pci_dev *pcidev, u32 unused)
{
+ int i;
struct ymf_unit *unit = pci_get_drvdata(pcidev);
unsigned long flags;
struct ymf_dmabuf *dmabuf;
struct list_head *p;
struct ymf_state *state;
+ struct ac97_codec *codec;

spin_lock_irqsave(&unit->reg_lock, flags);

unit->suspended = 1;

+ for (i = 0; i < NR_AC97; i++) {
+ codec = unit->ac97_codec[i];
+ if (!codec)
+ continue;
+ ac97_save_state(codec);
+ }
+
list_for_each(p, &unit->states) {
state = list_entry(p, struct ymf_state, chain);

@@ -2024,13 +2033,22 @@

static int ymf_resume(struct pci_dev *pcidev)
{
+ int i;
struct ymf_unit *unit = pci_get_drvdata(pcidev);
unsigned long flags;
struct list_head *p;
struct ymf_state *state;
+ struct ac97_codec *codec;

ymfpci_aclink_reset(unit->pci);
ymfpci_codec_ready(unit, 0, 1); /* prints diag if not ready. */
+
+ for (i = 0; i < NR_AC97; i++) {
+ codec = unit->ac97_codec[i];
+ if (!codec)
+ continue;
+ ac97_restore_state(codec);
+ }

#ifdef CONFIG_SOUND_YMFPCI_LEGACY
/* XXX At this time the legacy registers are probably deprogrammed. */
diff -ur linux-2.4.15-pre2/include/linux/ac97_codec.h linux-2.4.15-pre2.x/include/linux/ac97_codec.h
--- linux-2.4.15-pre2/include/linux/ac97_codec.h Sun Nov 11 13:12:47 2001
+++ linux-2.4.15-pre2.x/include/linux/ac97_codec.h Sun Nov 11 20:40:29 2001
@@ -239,6 +239,7 @@
extern int ac97_probe_codec(struct ac97_codec *);
extern unsigned int ac97_set_adc_rate(struct ac97_codec *codec, unsigned int rate);
extern unsigned int ac97_set_dac_rate(struct ac97_codec *codec, unsigned int rate);
-
+extern int ac97_save_state(struct ac97_codec *codec);
+extern int ac97_restore_state(struct ac97_codec *codec);

#endif /* _AC97_CODEC_H_ */



-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:13    [W:0.056 / U:0.068 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site