V4L/DVB (4048): Add support for the Texas Instruments TLV320AIC23B audio codec

Signed-off-by: Scott Alfter <salfter@ssai.us>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 217 insertions, 0 deletions

diff --git a/drivers/media/video/tlv320aic23b.c b/drivers/media/video/tlv320aic23b.c
new file mode 100644
index 000000000000..76b2e96429d9
--- /dev/null
+++ b/drivers/media/video/tlv320aic23b.c
@@ -0,0 +1,217 @@
+/*
+ * tlv320aic23b - driver version 0.0.1
+ *
+ * Copyright (C) 2006 Scott Alfter <salfter@ssai.us>
+ *
+ * Based on wm8775 driver
+ *
+ * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
+ * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/ioctl.h>
+#include <asm/uaccess.h>
+#include <linux/i2c.h>
+#include <linux/i2c-id.h>
+#include <linux/videodev.h>
+#include <media/v4l2-common.h>
+
+MODULE_DESCRIPTION("tlv320aic23b driver");
+MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
+MODULE_LICENSE("GPL");
+
+static unsigned short normal_i2c[] = { 0x34 >> 1, I2C_CLIENT_END };
+
+
+I2C_CLIENT_INSMOD;
+
+/* ----------------------------------------------------------------------- */
+
+struct tlv320aic23b_state {
+	u8 muted;
+};
+
+static int tlv320aic23b_write(struct i2c_client *client, int reg, u16 val)
+{
+	int i;
+
+	if ((reg < 0 || reg > 9) && (reg != 15)) {
+		v4l_err(client, "Invalid register R%d\n", reg);
+		return -1;
+	}
+
+	for (i = 0; i < 3; i++) {
+		if (i2c_smbus_write_byte_data(client, (reg << 1) |
+					(val >> 8), val & 0xff) == 0) {
+			return 0;
+		}
+	}
+	v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
+	return -1;
+}
+
+static int tlv320aic23b_command(struct i2c_client *client, unsigned int cmd,
+			  void *arg)
+{
+	struct tlv320aic23b_state *state = i2c_get_clientdata(client);
+	struct v4l2_control *ctrl = arg;
+	u32* freq = arg;
+
+	switch (cmd) {
+	case VIDIOC_INT_AUDIO_CLOCK_FREQ:
+		switch (*freq) {
+			case 32000: /* set sample rate to 32 kHz */
+				tlv320aic23b_write(client, 8, 0x018);
+				break;
+			case 44100: /* set sample rate to 44.1 kHz */
+				tlv320aic23b_write(client, 8, 0x022);
+				break;
+			case 48000: /* set sample rate to 48 kHz */
+				tlv320aic23b_write(client, 8, 0x000);
+				break;
+			default:
+				return -EINVAL;
+		}
+		break;
+
+	case VIDIOC_G_CTRL:
+		if (ctrl->id != V4L2_CID_AUDIO_MUTE)
+			return -EINVAL;
+		ctrl->value = state->muted;
+		break;
+
+	case VIDIOC_S_CTRL:
+		if (ctrl->id != V4L2_CID_AUDIO_MUTE)
+			return -EINVAL;
+		state->muted = ctrl->value;
+		tlv320aic23b_write(client, 0, 0x180); /* mute both channels */
+		/* set gain on both channels to +3.0 dB */
+		if (!state->muted)
+			tlv320aic23b_write(client, 0, 0x119);
+		break;
+
+	case VIDIOC_LOG_STATUS:
+		v4l_info(client, "Input: %s\n",
+			    state->muted ? "muted" : "active");
+		break;
+
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+/* ----------------------------------------------------------------------- */
+
+/* i2c implementation */
+
+/*
+ * Generic i2c probe
+ * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
+ */
+
+static struct i2c_driver i2c_driver;
+
+static int tlv320aic23b_attach(struct i2c_adapter *adapter, int address, int kind)
+{
+	struct i2c_client *client;
+	struct tlv320aic23b_state *state;
+
+	/* Check if the adapter supports the needed features */
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+		return 0;
+
+	client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
+	if (client == 0)
+		return -ENOMEM;
+
+	client->addr = address;
+	client->adapter = adapter;
+	client->driver = &i2c_driver;
+	snprintf(client->name, sizeof(client->name) - 1, "tlv320aic23b");
+
+	v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);
+
+	state = kmalloc(sizeof(struct tlv320aic23b_state), GFP_KERNEL);
+	if (state == NULL) {
+		kfree(client);
+		return -ENOMEM;
+	}
+	state->muted = 0;
+	i2c_set_clientdata(client, state);
+
+	/* initialize tlv320aic23b */
+	tlv320aic23b_write(client, 15, 0x000);	/* RESET */
+	tlv320aic23b_write(client, 6, 0x00A);   /* turn off DAC & mic input */
+	tlv320aic23b_write(client, 7, 0x049);   /* left-justified, 24-bit, master mode */
+	tlv320aic23b_write(client, 0, 0x119);   /* set gain on both channels to +3.0 dB */
+	tlv320aic23b_write(client, 8, 0x000);   /* set sample rate to 48 kHz */
+	tlv320aic23b_write(client, 9, 0x001);   /* activate digital interface */
+
+	i2c_attach_client(client);
+
+	return 0;
+}
+
+static int tlv320aic23b_probe(struct i2c_adapter *adapter)
+{
+	if (adapter->class & I2C_CLASS_TV_ANALOG)
+		return i2c_probe(adapter, &addr_data, tlv320aic23b_attach);
+	return 0;
+}
+
+static int tlv320aic23b_detach(struct i2c_client *client)
+{
+	int err;
+
+	err = i2c_detach_client(client);
+	if (err) {
+		return err;
+	}
+	kfree(client);
+
+	return 0;
+}
+
+/* ----------------------------------------------------------------------- */
+
+/* i2c implementation */
+static struct i2c_driver i2c_driver = {
+	.driver = {
+		.name = "tlv320aic23b",
+	},
+	.id             = I2C_DRIVERID_TLV320AIC23B,
+	.attach_adapter = tlv320aic23b_probe,
+	.detach_client  = tlv320aic23b_detach,
+	.command        = tlv320aic23b_command,
+};
+
+
+static int __init tlv320aic23b_init_module(void)
+{
+	return i2c_add_driver(&i2c_driver);
+}
+
+static void __exit tlv320aic23b_cleanup_module(void)
+{
+	i2c_del_driver(&i2c_driver);
+}
+
+module_init(tlv320aic23b_init_module);
+module_exit(tlv320aic23b_cleanup_module);