1 files changed, 155 insertions, 0 deletions
diff --git a/drivers/media/video/tea6420.c b/drivers/media/video/tea6420.c
new file mode 100644
index 0000000..e508209
--- /dev/null
+++ b/drivers/media/video/tea6420.c
@@ -0,0 +1,155 @@
+ /*
+    tea6420 - i2c-driver for the tea6420 by SGS Thomson
+
+    Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
+    Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
+
+    The tea6420 is a bus controlled audio-matrix with 5 stereo inputs,
+    4 stereo outputs and gain control for each output.
+    It is cascadable, i.e. it can be found at the adresses 0x98
+    and 0x9a on the i2c-bus.
+
+    For detailed informations download the specifications directly
+    from SGS Thomson at http://www.st.com
+
+    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/ioctl.h>
+#include <linux/i2c.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-i2c-drv-legacy.h>
+#include "tea6420.h"
+
+MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
+MODULE_DESCRIPTION("tea6420 driver");
+MODULE_LICENSE("GPL");
+
+static int debug;
+module_param(debug, int, 0644);
+
+MODULE_PARM_DESC(debug, "Debug level (0-1)");
+
+/* addresses to scan, found only at 0x4c and/or 0x4d (7-Bit) */
+static unsigned short normal_i2c[] = { I2C_ADDR_TEA6420_1, I2C_ADDR_TEA6420_2, I2C_CLIENT_END };
+
+/* magic definition of all other variables and things */
+I2C_CLIENT_INSMOD;
+
+/* make a connection between the input 'i' and the output 'o'
+   with gain 'g' for the tea6420-client 'client' (note: i = 6 means 'mute') */
+static int tea6420_switch(struct i2c_client *client, int i, int o, int g)
+{
+	u8 byte;
+	int ret;
+
+	v4l_dbg(1, debug, client, "i=%d, o=%d, g=%d\n", i, o, g);
+
+	/* check if the parameters are valid */
+	if (i < 1 || i > 6 || o < 1 || o > 4 || g < 0 || g > 6 || g % 2 != 0)
+		return -1;
+
+	byte = ((o - 1) << 5);
+	byte |= (i - 1);
+
+	/* to understand this, have a look at the tea6420-specs (p.5) */
+	switch (g) {
+	case 0:
+		byte |= (3 << 3);
+		break;
+	case 2:
+		byte |= (2 << 3);
+		break;
+	case 4:
+		byte |= (1 << 3);
+		break;
+	case 6:
+		break;
+	}
+
+	ret = i2c_smbus_write_byte(client, byte);
+	if (ret) {
+		v4l_dbg(1, debug, client,
+			"i2c_smbus_write_byte() failed, ret:%d\n", ret);
+		return -EIO;
+	}
+	return 0;
+}
+
+static int tea6420_command(struct i2c_client *client, unsigned cmd, void *arg)
+{
+	struct tea6420_multiplex *a = (struct tea6420_multiplex *)arg;
+	int result = 0;
+
+	switch (cmd) {
+	case TEA6420_SWITCH:
+		result = tea6420_switch(client, a->in, a->out, a->gain);
+		break;
+	default:
+		return -ENOIOCTLCMD;
+	}
+
+	return result;
+}
+
+/* this function is called by i2c_probe */
+static int tea6420_probe(struct i2c_client *client,
+			  const struct i2c_device_id *id)
+{
+	int err, i;
+
+	/* let's see whether this adapter can support what we need */
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
+		return -EIO;
+
+	v4l_info(client, "chip found @ 0x%x (%s)\n",
+			client->addr << 1, client->adapter->name);
+
+	/* set initial values: set "mute"-input to all outputs at gain 0 */
+	err = 0;
+	for (i = 1; i < 5; i++) {
+		err += tea6420_switch(client, 6, i, 0);
+	}
+	if (err) {
+		v4l_dbg(1, debug, client, "could not initialize tea6420\n");
+		kfree(client);
+		return -ENODEV;
+	}
+	return 0;
+}
+
+static int tea6420_legacy_probe(struct i2c_adapter *adapter)
+{
+	/* Let's see whether this is a known adapter we can attach to.
+	   Prevents conflicts with tvaudio.c. */
+	return adapter->id == I2C_HW_SAA7146;
+}
+
+static const struct i2c_device_id tea6420_id[] = {
+	{ "tea6420", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, tea6420_id);
+
+static struct v4l2_i2c_driver_data v4l2_i2c_data = {
+	.name = "tea6420",
+	.driverid = I2C_DRIVERID_TEA6420,
+	.command = tea6420_command,
+	.probe = tea6420_probe,
+	.legacy_probe = tea6420_legacy_probe,
+	.id_table = tea6420_id,
+};