[ALSA] #4/4 for Zoom Video - add Zoom Video support

Modules: ES18xx driver

Forth of 4 es18xx.c patches culminating in Zoom Video support.

This patch adds Zoom Video support for those chipsets that support it.

Testing:
This work was initially done on the source from the Debian Sarge ALSA
package, then tested
on an ES1879. I could not test the Zoom Video function for an ES1878 or
ES1869.
Patches were created against the Sarge code and then edited to apply
correctly to the
ALSA cvs code. Lastly the patched ALSA cvs code was test for successful
compilation.
No additional testing was done on the ALSA cvs version.

One quirk (noted in my comments below) is that apparently the datasheet
is wrong
for one of the ES1879 Zoom Video 'enable' bits, because
 1) if you set this bit it messes up PCM playback (speaker_test play a
lower frequency)
 2) even if you don't set this bit Zoom Video still works.
I added a control to toggle the bit on just in case there might be a
version of the
ES1879 that requires it, but I expect noone will need it.

Signed-off-by: Mark Salazar <markTheCoder@justmyself.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/isa/es18xx.c

@@ -49,6 +49,10 @@
  * - contrarily to some pages in DS_1869.PDF the rates can be set
  *   independently.
  *
+ * - Zoom Video is implemented by sharing the FM DAC, thus the user can
+ *   have either FM playback or Video playback but not both simultaneously.
+ *   The Video Playback Switch mixer control toggles this choice.
+ *
  * BUGS:
  *
  * - There is a major trouble I noted:
@@ -63,7 +67,16 @@
  *
  */
 
-
+/*
+ * ES1879 NOTES:
+ * - When Zoom Video is enabled (reg 0x71 bit 6 toggled on) the PCM playback
+ *   seems to be effected (speaker_test plays a lower frequency). Can't find
+ *   anything in the datasheet to account for this, so a Video Playback Switch
+ *   control has been included to allow ZV to be enabled only when necessary.
+ *   Then again on at least one test system the 0x71 bit 6 enable bit is not 
+ *   needed for ZV, so maybe the datasheet is entirely wrong here.
+ */
+ 
 #include <sound/driver.h>
 #include <linux/init.h>
 #include <linux/err.h>
@@ -1317,10 +1330,20 @@ static struct snd_kcontrol_new snd_es18xx_opt_speaker =
 
 static struct snd_kcontrol_new snd_es18xx_opt_1869[] = {
 ES18XX_SINGLE("Capture Switch", 0, 0x1c, 4, 1, 1),
+ES18XX_SINGLE("Video Playback Switch", 0, 0x7f, 0, 1, 0),
 ES18XX_DOUBLE("Mono Playback Volume", 0, 0x6d, 0x6d, 4, 0, 15, 0),
 ES18XX_DOUBLE("Mono Capture Volume", 0, 0x6f, 0x6f, 4, 0, 15, 0)
 };
 
+static struct snd_kcontrol_new snd_es18xx_opt_1878 =
+	ES18XX_DOUBLE("Video Playback Volume", 0, 0x68, 0x68, 4, 0, 15, 0);
+
+static struct snd_kcontrol_new snd_es18xx_opt_1879[] = {
+ES18XX_SINGLE("Video Playback Switch", 0, 0x71, 6, 1, 0),
+ES18XX_DOUBLE("Video Playback Volume", 0, 0x6d, 0x6d, 4, 0, 15, 0),
+ES18XX_DOUBLE("Video Capture Volume", 0, 0x6f, 0x6f, 4, 0, 15, 0)
+};
+
 static struct snd_kcontrol_new snd_es18xx_pcm1_controls[] = {
 ES18XX_DOUBLE("PCM Playback Volume", 0, 0x14, 0x14, 4, 0, 15, 0),
 };
@@ -1365,7 +1388,6 @@ static struct snd_kcontrol_new snd_es18xx_hw_volume_controls[] = {
 ES18XX_SINGLE("Hardware Master Volume Split", 0, 0x64, 7, 1, 0),
 };
 
-#if 0
 static int __devinit snd_es18xx_config_read(struct snd_es18xx *chip, unsigned char reg)
 {
 	int data;
@@ -1376,7 +1398,6 @@ static int __devinit snd_es18xx_config_read(struct snd_es18xx *chip, unsigned ch
         spin_unlock_irqrestore(&chip->ctrl_lock, flags);
 	return data;
 }
-#endif
 
 static void __devinit snd_es18xx_config_write(struct snd_es18xx *chip, 
 					      unsigned char reg, unsigned char data)
@@ -1522,6 +1543,17 @@ static int __devinit snd_es18xx_initialize(struct snd_es18xx *chip)
 		snd_es18xx_mixer_write(chip, 0x58, 0x94);
 		snd_es18xx_mixer_write(chip, 0x5a, 0x80);
 	}
+	/* Flip the "enable I2S" bits for those chipsets that need it */
+	switch (chip->version) {
+	case 0x1879:
+		//Leaving I2S enabled on the 1879 screws up the PCM playback (rate effected somehow)
+		//so a Switch control has been added to toggle this 0x71 bit on/off:
+		//snd_es18xx_mixer_bits(chip, 0x71, 0x40, 0x40);
+		/* Note: we fall through on purpose here. */
+	case 0x1878:
+		snd_es18xx_config_write(chip, 0x29, snd_es18xx_config_read(chip, 0x29) | 0x40);
+		break;
+	}
 	/* Mute input source */
 	if (chip->caps & ES18XX_MUTEREC)
 		mask = 0x10;
@@ -1929,6 +1961,19 @@ static int __devinit snd_es18xx_mixer(struct snd_es18xx *chip)
 			if (err < 0)
 				return err;
 		}
+	} else if (chip->version == 0x1878) {
+		err = snd_ctl_add(card, snd_ctl_new1(&snd_es18xx_opt_1878,
+						     chip));
+		if (err < 0)
+			return err;
+	} else if (chip->version == 0x1879) {
+		for (idx = 0; idx < ARRAY_SIZE(snd_es18xx_opt_1879); idx++) {
+			err = snd_ctl_add(card,
+					  snd_ctl_new1(&snd_es18xx_opt_1879[idx],
+						       chip));
+			if (err < 0)
+				return err;
+		}
 	}
 	return 0;
 }