ALSA: es1968,maestro3 - Use work for hw-volume control

Instead of tasklet, use workq for handling the hw-volume control.
This reduces lots of spinlocks.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 11 insertions, 53 deletions

diff --git a/sound/pci/es1968.c b/sound/pci/es1968.c
index 3fa46593a3b9..99ea9320c6b5 100644
--- a/sound/pci/es1968.c
+++ b/sound/pci/es1968.c
@@ -554,9 +554,8 @@ struct es1968 {
 #else
         struct snd_kcontrol *master_switch; /* for h/w volume control */
         struct snd_kcontrol *master_volume;
-        spinlock_t ac97_lock;
-        struct tasklet_struct hwvol_tq;
 #endif
+        struct work_struct hwvol_work;
 
 #ifdef CONFIG_SND_ES1968_RADIO
         struct snd_tea575x tea;
@@ -646,38 +645,23 @@ static int snd_es1968_ac97_wait_poll(struct es1968 *chip)
 static void snd_es1968_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val)
 {
         struct es1968 *chip = ac97->private_data;
-#ifndef CONFIG_SND_ES1968_INPUT
-        unsigned long flags;
-#endif
 
         snd_es1968_ac97_wait(chip);
 
         /* Write the bus */
-#ifndef CONFIG_SND_ES1968_INPUT
-        spin_lock_irqsave(&chip->ac97_lock, flags);
-#endif
         outw(val, chip->io_port + ESM_AC97_DATA);
         /*msleep(1);*/
         outb(reg, chip->io_port + ESM_AC97_INDEX);
         /*msleep(1);*/
-#ifndef CONFIG_SND_ES1968_INPUT
-        spin_unlock_irqrestore(&chip->ac97_lock, flags);
-#endif
 }
 
 static unsigned short snd_es1968_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
 {
         u16 data = 0;
         struct es1968 *chip = ac97->private_data;
-#ifndef CONFIG_SND_ES1968_INPUT
-        unsigned long flags;
-#endif
 
         snd_es1968_ac97_wait(chip);
 
-#ifndef CONFIG_SND_ES1968_INPUT
-        spin_lock_irqsave(&chip->ac97_lock, flags);
-#endif
         outb(reg | 0x80, chip->io_port + ESM_AC97_INDEX);
         /*msleep(1);*/
 
@@ -685,9 +669,6 @@ static unsigned short snd_es1968_ac97_read(struct snd_ac97 *ac97, unsigned short
                 data = inw(chip->io_port + ESM_AC97_DATA);
                 /*msleep(1);*/
         }
-#ifndef CONFIG_SND_ES1968_INPUT
-        spin_unlock_irqrestore(&chip->ac97_lock, flags);
-#endif
 
         return data;
 }
@@ -1904,13 +1885,10 @@ static void snd_es1968_update_pcm(struct es1968 *chip, struct esschan *es)
    (without wrap around) in response to volume button presses and then
    generating an interrupt. The pair of counters is stored in bits 1-3 and 5-7
    of a byte wide register. The meaning of bits 0 and 4 is unknown. */
-static void es1968_update_hw_volume(unsigned long private_data)
+static void es1968_update_hw_volume(struct work_struct *work)
 {
-        struct es1968 *chip = (struct es1968 *) private_data;
+        struct es1968 *chip = container_of(work, struct es1968, hwvol_work);
         int x, val;
-#ifndef CONFIG_SND_ES1968_INPUT
-        unsigned long flags;
-#endif
 
         /* Figure out which volume control button was pushed,
            based on differences from the default register
@@ -1929,18 +1907,11 @@ static void es1968_update_hw_volume(unsigned long private_data)
         if (! chip->master_switch || ! chip->master_volume)
                 return;
 
-        /* FIXME: we can't call snd_ac97_* functions since here is in tasklet. */
-        spin_lock_irqsave(&chip->ac97_lock, flags);
-        val = chip->ac97->regs[AC97_MASTER];
+        val = snd_ac97_read(chip->ac97, AC97_MASTER);
         switch (x) {
         case 0x88:
                 /* mute */
                 val ^= 0x8000;
-                chip->ac97->regs[AC97_MASTER] = val;
-                outw(val, chip->io_port + ESM_AC97_DATA);
-                outb(AC97_MASTER, chip->io_port + ESM_AC97_INDEX);
-                snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
-                               &chip->master_switch->id);
                 break;
         case 0xaa:
                 /* volume up */
@@ -1948,11 +1919,6 @@ static void es1968_update_hw_volume(unsigned long private_data)
                         val--;
                 if ((val & 0x7f00) > 0)
                         val -= 0x0100;
-                chip->ac97->regs[AC97_MASTER] = val;
-                outw(val, chip->io_port + ESM_AC97_DATA);
-                outb(AC97_MASTER, chip->io_port + ESM_AC97_INDEX);
-                snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
-                               &chip->master_volume->id);
                 break;
         case 0x66:
                 /* volume down */
@@ -1960,14 +1926,11 @@ static void es1968_update_hw_volume(unsigned long private_data)
                         val++;
                 if ((val & 0x7f00) < 0x1f00)
                         val += 0x0100;
-                chip->ac97->regs[AC97_MASTER] = val;
-                outw(val, chip->io_port + ESM_AC97_DATA);
-                outb(AC97_MASTER, chip->io_port + ESM_AC97_INDEX);
-                snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
-                               &chip->master_volume->id);
                 break;
         }
-        spin_unlock_irqrestore(&chip->ac97_lock, flags);
+        if (snd_ac97_update(chip->ac97, AC97_MASTER, val))
+                snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
+                               &chip->master_volume->id);
 #else
         if (!chip->input_dev)
                 return;
@@ -2013,11 +1976,7 @@ static irqreturn_t snd_es1968_interrupt(int irq, void *dev_id)
         outw(inw(chip->io_port + 4) & 1, chip->io_port + 4);
 
         if (event & ESM_HWVOL_IRQ)
-#ifdef CONFIG_SND_ES1968_INPUT
-                es1968_update_hw_volume((unsigned long)chip);
-#else
-                tasklet_schedule(&chip->hwvol_tq); /* we'll do this later */
-#endif
+                schedule_work(&chip->hwvol_work);
 
         /* else ack 'em all, i imagine */
         outb(0xFF, chip->io_port + 0x1A);
@@ -2426,6 +2385,7 @@ static int es1968_suspend(struct pci_dev *pci, pm_message_t state)
                 return 0;
 
         chip->in_suspend = 1;
+        cancel_work_sync(&chip->hwvol_work);
         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
         snd_pcm_suspend_all(chip->pcm);
         snd_ac97_suspend(chip->ac97);
@@ -2638,6 +2598,7 @@ static struct snd_tea575x_ops snd_es1968_tea_ops = {
 
 static int snd_es1968_free(struct es1968 *chip)
 {
+        cancel_work_sync(&chip->hwvol_work);
 #ifdef CONFIG_SND_ES1968_INPUT
         if (chip->input_dev)
                 input_unregister_device(chip->input_dev);
@@ -2728,10 +2689,7 @@ static int __devinit snd_es1968_create(struct snd_card *card,
         INIT_LIST_HEAD(&chip->buf_list);
         INIT_LIST_HEAD(&chip->substream_list);
         mutex_init(&chip->memory_mutex);
-#ifndef CONFIG_SND_ES1968_INPUT
-        spin_lock_init(&chip->ac97_lock);
-        tasklet_init(&chip->hwvol_tq, es1968_update_hw_volume, (unsigned long)chip);
-#endif
+        INIT_WORK(&chip->hwvol_work, es1968_update_hw_volume);
         chip->card = card;
         chip->pci = pci;
         chip->irq = -1;