ALSA: ak411x: Add PM helper functions

[firefly-linux-kernel-4.4.55.git] / sound / i2c / other / ak4113.c

diff --git a/sound/i2c/other/ak4113.c b/sound/i2c/other/ak4113.c
index 1a3a6fa27158b0096de715c8e322ec0cddeb62ec..c2b14d981fa1fb0dc3634688045148a8eaf07885 100644 (file)
--- a/sound/i2c/other/ak4113.c
+++ b/sound/i2c/other/ak4113.c
@@ -56,8 +56,7 @@ static inline unsigned char reg_read(struct ak4113 *ak4113, unsigned char reg)
 
 static void snd_ak4113_free(struct ak4113 *chip)
 {
-       chip->init = 1; /* don't schedule new work */
-       mb();
+       atomic_inc(&chip->wq_processing);       /* don't schedule new work */
        cancel_delayed_work_sync(&chip->work);
        kfree(chip);
 }
@@ -89,6 +88,7 @@ int snd_ak4113_create(struct snd_card *card, ak4113_read_t *read,
        chip->write = write;
        chip->private_data = private_data;
        INIT_DELAYED_WORK(&chip->work, ak4113_stats);
+       atomic_set(&chip->wq_processing, 0);
 
        for (reg = 0; reg < AK4113_WRITABLE_REGS ; reg++)
                chip->regmap[reg] = pgm[reg];
@@ -139,13 +139,11 @@ static void ak4113_init_regs(struct ak4113 *chip)
 
 void snd_ak4113_reinit(struct ak4113 *chip)
 {
-       chip->init = 1;
-       mb();
-       flush_delayed_work(&chip->work);
+       if (atomic_inc_return(&chip->wq_processing) == 1)
+               cancel_delayed_work_sync(&chip->work);
        ak4113_init_regs(chip);
        /* bring up statistics / event queing */
-       chip->init = 0;
-       if (chip->kctls[0])
+       if (atomic_dec_and_test(&chip->wq_processing))
                schedule_delayed_work(&chip->work, HZ / 10);
 }
 EXPORT_SYMBOL_GPL(snd_ak4113_reinit);
@@ -632,8 +630,25 @@ static void ak4113_stats(struct work_struct *work)
 {
        struct ak4113 *chip = container_of(work, struct ak4113, work.work);
 
-       if (!chip->init)
+       if (atomic_inc_return(&chip->wq_processing) == 1)
                snd_ak4113_check_rate_and_errors(chip, chip->check_flags);
 
-       schedule_delayed_work(&chip->work, HZ / 10);
+       if (atomic_dec_and_test(&chip->wq_processing))
+               schedule_delayed_work(&chip->work, HZ / 10);
+}
+
+#ifdef CONFIG_PM
+void snd_ak4113_suspend(struct ak4113 *chip)
+{
+       atomic_inc(&chip->wq_processing); /* don't schedule new work */
+       cancel_delayed_work_sync(&chip->work);
+}
+EXPORT_SYMBOL(snd_ak4113_suspend);
+
+void snd_ak4113_resume(struct ak4113 *chip)
+{
+       atomic_dec(&chip->wq_processing);
+       snd_ak4113_reinit(chip);
 }
+EXPORT_SYMBOL(snd_ak4113_resume);
+#endif