ALSA: snd-es1968: Make hardware volume buttons an input device (rev2)
The hardware volume handling code in essence just detects key presses, and
then does some hardcoded modification of the master volume based on which key
is pressed.
Clearly the right thing to do here is just report these keypresses to
userspace and let userspace decide what to with them.
This patch adds a Kconfig option which when enabled reports the volume
buttons as keypresses using an input device. When enabled this option
also gets rid of the ugly direct ac97 writes from the tasklet, the ac97lock
and the need for using a tasklet in general.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/es1968.c b/sound/pci/es1968.c
index ecaea9f..aa973ce 100644
--- a/sound/pci/es1968.c
+++ b/sound/pci/es1968.c
@@ -104,6 +104,7 @@
#include <linux/gameport.h>
#include <linux/moduleparam.h>
#include <linux/mutex.h>
+#include <linux/input.h>
#include <sound/core.h>
#include <sound/pcm.h>
@@ -517,14 +518,9 @@
/* ALSA Stuff */
struct snd_ac97 *ac97;
- struct snd_kcontrol *master_switch; /* for h/w volume control */
- struct snd_kcontrol *master_volume;
-
struct snd_rawmidi *rmidi;
spinlock_t reg_lock;
- spinlock_t ac97_lock;
- struct tasklet_struct hwvol_tq;
unsigned int in_suspend;
/* Maestro Stuff */
@@ -547,6 +543,16 @@
#ifdef SUPPORT_JOYSTICK
struct gameport *gameport;
#endif
+
+#ifdef CONFIG_SND_ES1968_INPUT
+ struct input_dev *input_dev;
+ char phys[64]; /* physical device path */
+#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
};
static irqreturn_t snd_es1968_interrupt(int irq, void *dev_id);
@@ -632,28 +638,38 @@
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);*/
@@ -661,7 +677,9 @@
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;
}
@@ -1874,13 +1892,17 @@
}
}
-/*
- */
+/* The hardware volume works by incrementing / decrementing 2 counters
+ (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)
{
struct es1968 *chip = (struct es1968 *) private_data;
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
@@ -1895,6 +1917,7 @@
if (chip->in_suspend)
return;
+#ifndef CONFIG_SND_ES1968_INPUT
if (! chip->master_switch || ! chip->master_volume)
return;
@@ -1937,6 +1960,35 @@
break;
}
spin_unlock_irqrestore(&chip->ac97_lock, flags);
+#else
+ if (!chip->input_dev)
+ return;
+
+ val = 0;
+ switch (x) {
+ case 0x88:
+ /* The counters have not changed, yet we've received a HV
+ interrupt. According to tests run by various people this
+ happens when pressing the mute button. */
+ val = KEY_MUTE;
+ break;
+ case 0xaa:
+ /* counters increased by 1 -> volume up */
+ val = KEY_VOLUMEUP;
+ break;
+ case 0x66:
+ /* counters decreased by 1 -> volume down */
+ val = KEY_VOLUMEDOWN;
+ break;
+ }
+
+ if (val) {
+ input_report_key(chip->input_dev, val, 1);
+ input_sync(chip->input_dev);
+ input_report_key(chip->input_dev, val, 0);
+ input_sync(chip->input_dev);
+ }
+#endif
}
/*
@@ -1953,7 +2005,11 @@
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
/* else ack 'em all, i imagine */
outb(0xFF, chip->io_port + 0x1A);
@@ -1993,7 +2049,9 @@
{
struct snd_ac97_bus *pbus;
struct snd_ac97_template ac97;
+#ifndef CONFIG_SND_ES1968_INPUT
struct snd_ctl_elem_id elem_id;
+#endif
int err;
static struct snd_ac97_bus_ops ops = {
.write = snd_es1968_ac97_write,
@@ -2009,6 +2067,7 @@
if ((err = snd_ac97_mixer(pbus, &ac97, &chip->ac97)) < 0)
return err;
+#ifndef CONFIG_SND_ES1968_INPUT
/* attach master switch / volumes for h/w volume control */
memset(&elem_id, 0, sizeof(elem_id));
elem_id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
@@ -2018,6 +2077,7 @@
elem_id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
strcpy(elem_id.name, "Master Playback Volume");
chip->master_volume = snd_ctl_find_id(chip->card, &elem_id);
+#endif
return 0;
}
@@ -2474,8 +2534,49 @@
static inline void snd_es1968_free_gameport(struct es1968 *chip) { }
#endif
+#ifdef CONFIG_SND_ES1968_INPUT
+static int __devinit snd_es1968_input_register(struct es1968 *chip)
+{
+ struct input_dev *input_dev;
+ int err;
+
+ input_dev = input_allocate_device();
+ if (!input_dev)
+ return -ENOMEM;
+
+ snprintf(chip->phys, sizeof(chip->phys), "pci-%s/input0",
+ pci_name(chip->pci));
+
+ input_dev->name = chip->card->driver;
+ input_dev->phys = chip->phys;
+ input_dev->id.bustype = BUS_PCI;
+ input_dev->id.vendor = chip->pci->vendor;
+ input_dev->id.product = chip->pci->device;
+ input_dev->dev.parent = &chip->pci->dev;
+
+ __set_bit(EV_KEY, input_dev->evbit);
+ __set_bit(KEY_MUTE, input_dev->keybit);
+ __set_bit(KEY_VOLUMEDOWN, input_dev->keybit);
+ __set_bit(KEY_VOLUMEUP, input_dev->keybit);
+
+ err = input_register_device(input_dev);
+ if (err) {
+ input_free_device(input_dev);
+ return err;
+ }
+
+ chip->input_dev = input_dev;
+ return 0;
+}
+#endif /* CONFIG_SND_ES1968_INPUT */
+
static int snd_es1968_free(struct es1968 *chip)
{
+#ifdef CONFIG_SND_ES1968_INPUT
+ if (chip->input_dev)
+ input_unregister_device(chip->input_dev);
+#endif
+
if (chip->io_port) {
if (chip->irq >= 0)
synchronize_irq(chip->irq);
@@ -2486,8 +2587,6 @@
if (chip->irq >= 0)
free_irq(chip->irq, chip);
snd_es1968_free_gameport(chip);
- chip->master_switch = NULL;
- chip->master_volume = NULL;
pci_release_regions(chip->pci);
pci_disable_device(chip->pci);
kfree(chip);
@@ -2558,9 +2657,11 @@
spin_lock_init(&chip->substream_lock);
INIT_LIST_HEAD(&chip->buf_list);
INIT_LIST_HEAD(&chip->substream_list);
- spin_lock_init(&chip->ac97_lock);
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
chip->card = card;
chip->pci = pci;
chip->irq = -1;
@@ -2713,6 +2814,13 @@
snd_es1968_create_gameport(chip, dev);
+#ifdef CONFIG_SND_ES1968_INPUT
+ err = snd_es1968_input_register(chip);
+ if (err)
+ snd_printk(KERN_WARNING "Input device registration "
+ "failed with error %i", err);
+#endif
+
snd_es1968_start_irq(chip);
chip->clock = clock[dev];