1 files changed, 152 insertions, 0 deletions

diff --git a/drivers/media/usb/stk1160/stk1160-ac97.c b/drivers/media/usb/stk1160/stk1160-ac97.c
new file mode 100644
index 000000000000..c8583c262c3d
--- /dev/null
+++ b/drivers/media/usb/stk1160/stk1160-ac97.c
@@ -0,0 +1,152 @@
+/*
+ * STK1160 driver
+ *
+ * Copyright (C) 2012 Ezequiel Garcia
+ * <elezegarcia--a.t--gmail.com>
+ *
+ * Based on Easycap driver by R.M. Thomas
+ *	Copyright (C) 2010 R.M. Thomas
+ *	<rmthomas--a.t--sciolus.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/ac97_codec.h>
+
+#include "stk1160.h"
+#include "stk1160-reg.h"
+
+static struct snd_ac97 *stk1160_ac97;
+
+static void stk1160_write_ac97(struct snd_ac97 *ac97, u16 reg, u16 value)
+{
+	struct stk1160 *dev = ac97->private_data;
+
+	/* Set codec register address */
+	stk1160_write_reg(dev, STK1160_AC97_ADDR, reg);
+
+	/* Set codec command */
+	stk1160_write_reg(dev, STK1160_AC97_CMD, value & 0xff);
+	stk1160_write_reg(dev, STK1160_AC97_CMD + 1, (value & 0xff00) >> 8);
+
+	/*
+	 * Set command write bit to initiate write operation.
+	 * The bit will be cleared when transfer is done.
+	 */
+	stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x8c);
+}
+
+static u16 stk1160_read_ac97(struct snd_ac97 *ac97, u16 reg)
+{
+	struct stk1160 *dev = ac97->private_data;
+	u8 vall = 0;
+	u8 valh = 0;
+
+	/* Set codec register address */
+	stk1160_write_reg(dev, STK1160_AC97_ADDR, reg);
+
+	/*
+	 * Set command read bit to initiate read operation.
+	 * The bit will be cleared when transfer is done.
+	 */
+	stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x8b);
+
+	/* Retrieve register value */
+	stk1160_read_reg(dev, STK1160_AC97_CMD, &vall);
+	stk1160_read_reg(dev, STK1160_AC97_CMD + 1, &valh);
+
+	return (valh << 8) | vall;
+}
+
+static void stk1160_reset_ac97(struct snd_ac97 *ac97)
+{
+	struct stk1160 *dev = ac97->private_data;
+	/* Two-step reset AC97 interface and hardware codec */
+	stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x94);
+	stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x88);
+
+	/* Set 16-bit audio data and choose L&R channel*/
+	stk1160_write_reg(dev, STK1160_AC97CTL_1 + 2, 0x01);
+}
+
+static struct snd_ac97_bus_ops stk1160_ac97_ops = {
+	.read	= stk1160_read_ac97,
+	.write	= stk1160_write_ac97,
+	.reset	= stk1160_reset_ac97,
+};
+
+int stk1160_ac97_register(struct stk1160 *dev)
+{
+	struct snd_card *card = NULL;
+	struct snd_ac97_bus *ac97_bus;
+	struct snd_ac97_template ac97_template;
+	int rc;
+
+	/*
+	 * Just want a card to access ac96 controls,
+	 * the actual capture interface will be handled by snd-usb-audio
+	 */
+	rc = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
+			      THIS_MODULE, 0, &card);
+	if (rc < 0)
+		return rc;
+
+	snd_card_set_dev(card, dev->dev);
+
+	/* TODO: I'm not sure where should I get these names :-( */
+	snprintf(card->shortname, sizeof(card->shortname),
+		 "stk1160-mixer");
+	snprintf(card->longname, sizeof(card->longname),
+		 "stk1160 ac97 codec mixer control");
+	strncpy(card->driver, dev->dev->driver->name, sizeof(card->driver));
+
+	rc = snd_ac97_bus(card, 0, &stk1160_ac97_ops, NULL, &ac97_bus);
+	if (rc)
+		goto err;
+
+	/* We must set private_data before calling snd_ac97_mixer */
+	memset(&ac97_template, 0, sizeof(ac97_template));
+	ac97_template.private_data = dev;
+	ac97_template.scaps = AC97_SCAP_SKIP_MODEM;
+	rc = snd_ac97_mixer(ac97_bus, &ac97_template, &stk1160_ac97);
+	if (rc)
+		goto err;
+
+	dev->snd_card = card;
+	rc = snd_card_register(card);
+	if (rc)
+		goto err;
+
+	return 0;
+
+err:
+	dev->snd_card = NULL;
+	snd_card_free(card);
+	return rc;
+}
+
+int stk1160_ac97_unregister(struct stk1160 *dev)
+{
+	struct snd_card *card = dev->snd_card;
+
+	/*
+	 * We need to check usb_device,
+	 * because ac97 release attempts to communicate with codec
+	 */
+	if (card && dev->udev)
+		snd_card_free(card);
+
+	return 0;
+}