1 files changed, 254 insertions, 0 deletions
diff --git a/drivers/media/video/tda9840.c b/drivers/media/video/tda9840.c
new file mode 100644
index 00000000000..b5177c6f54f
--- /dev/null
+++ b/drivers/media/video/tda9840.c
@@ -0,0 +1,254 @@
+ /*
+    tda9840 - i2c-driver for the tda9840 by SGS Thomson
+
+    Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
+
+    The tda9840 is a stereo/dual sound processor with digital
+    identification. It can be found at address 0x84 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 "tda9840.h"
+
+static int debug = 0;		/* insmod parameter */
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Turn on/off device debugging (default:off).");
+#define dprintk(args...) \
+            do { if (debug) { printk("%s: %s()[%d]: ",__stringify(KBUILD_MODNAME), __FUNCTION__, __LINE__); printk(args); } } while (0)
+
+#define	SWITCH		0x00
+#define	LEVEL_ADJUST	0x02
+#define	STEREO_ADJUST	0x03
+#define	TEST		0x04
+
+/* addresses to scan, found only at 0x42 (7-Bit) */
+static unsigned short normal_i2c[] = { I2C_TDA9840, I2C_CLIENT_END };
+static unsigned short normal_i2c_range[] = { I2C_CLIENT_END };
+
+/* magic definition of all other variables and things */
+I2C_CLIENT_INSMOD;
+
+static struct i2c_driver driver;
+static struct i2c_client client_template;
+
+static int command(struct i2c_client *client, unsigned int cmd, void *arg)
+{
+	int result;
+	int byte = *(int *)arg;
+
+	switch (cmd) {
+	case TDA9840_SWITCH:
+
+		dprintk("TDA9840_SWITCH: 0x%02x\n", byte);
+
+		if (byte != TDA9840_SET_MONO
+		    && byte != TDA9840_SET_MUTE
+		    && byte != TDA9840_SET_STEREO
+		    && byte != TDA9840_SET_LANG1
+		    && byte != TDA9840_SET_LANG2
+		    && byte != TDA9840_SET_BOTH
+		    && byte != TDA9840_SET_BOTH_R
+		    && byte != TDA9840_SET_EXTERNAL) {
+			return -EINVAL;
+		}
+
+		result = i2c_smbus_write_byte_data(client, SWITCH, byte);
+		if (result)
+			dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result);
+		break;
+
+	case TDA9840_LEVEL_ADJUST:
+
+		dprintk("TDA9840_LEVEL_ADJUST: %d\n", byte);
+
+		/* check for correct range */
+		if (byte > 25 || byte < -20)
+			return -EINVAL;
+
+		/* calculate actual value to set, see specs, page 18 */
+		byte /= 5;
+		if (0 < byte)
+			byte += 0x8;
+		else
+			byte = -byte;
+
+		result = i2c_smbus_write_byte_data(client, LEVEL_ADJUST, byte);
+		if (result)
+			dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result);
+		break;
+
+	case TDA9840_STEREO_ADJUST:
+
+		dprintk("TDA9840_STEREO_ADJUST: %d\n", byte);
+
+		/* check for correct range */
+		if (byte > 25 || byte < -24)
+			return -EINVAL;
+
+		/* calculate actual value to set */
+		byte /= 5;
+		if (0 < byte)
+			byte += 0x20;
+		else
+			byte = -byte;
+
+		result = i2c_smbus_write_byte_data(client, STEREO_ADJUST, byte);
+		if (result)
+			dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result);
+		break;
+
+	case TDA9840_DETECT: {
+		int *ret = (int *)arg;
+
+		byte = i2c_smbus_read_byte_data(client, STEREO_ADJUST);
+		if (byte == -1) {
+			dprintk("i2c_smbus_read_byte_data() failed\n");
+			return -EIO;
+		}
+
+		if (0 != (byte & 0x80)) {
+			dprintk("TDA9840_DETECT: register contents invalid\n");
+			return -EINVAL;
+		}
+
+		dprintk("TDA9840_DETECT: byte: 0x%02x\n", byte);
+		*ret = ((byte & 0x60) >> 5);
+		result = 0;
+		break;
+	}
+	case TDA9840_TEST:
+		dprintk("TDA9840_TEST: 0x%02x\n", byte);
+
+		/* mask out irrelevant bits */
+		byte &= 0x3;
+
+		result = i2c_smbus_write_byte_data(client, TEST, byte);
+		if (result)
+			dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result);
+		break;
+	default:
+		return -ENOIOCTLCMD;
+	}
+
+	if (result)
+		return -EIO;
+
+	return 0;
+}
+
+static int detect(struct i2c_adapter *adapter, int address, int kind)
+{
+	struct i2c_client *client;
+	int result = 0;
+
+	int byte = 0x0;
+
+	/* let's see whether this adapter can support what we need */
+	if (0 == i2c_check_functionality(adapter,
+				    I2C_FUNC_SMBUS_READ_BYTE_DATA |
+				    I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) {
+		return 0;
+	}
+
+	/* allocate memory for client structure */
+	client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
+	if (0 == client) {
+		printk("not enough kernel memory\n");
+		return -ENOMEM;
+	}
+
+	/* fill client structure */
+	memcpy(client, &client_template, sizeof(struct i2c_client));
+	client->addr = address;
+	client->adapter = adapter;
+
+	/* tell the i2c layer a new client has arrived */
+	if (0 != (result = i2c_attach_client(client))) {
+		kfree(client);
+		return result;
+	}
+
+	/* set initial values for level & stereo - adjustment, mode */
+	byte = 0;
+	result  = command(client, TDA9840_LEVEL_ADJUST, &byte);
+	result += command(client, TDA9840_STEREO_ADJUST, &byte);
+	byte = TDA9840_SET_MONO;
+	result = command(client, TDA9840_SWITCH, &byte);
+	if (result) {
+		dprintk("could not initialize tda9840\n");
+		return -ENODEV;
+	}
+
+	printk("tda9840: detected @ 0x%02x on adapter %s\n", address, &client->adapter->name[0]);
+	return 0;
+}
+
+static int attach(struct i2c_adapter *adapter)
+{
+	/* let's see whether this is a know adapter we can attach to */
+	if (adapter->id != I2C_ALGO_SAA7146) {
+		dprintk("refusing to probe on unknown adapter [name='%s',id=0x%x]\n", adapter->name, adapter->id);
+		return -ENODEV;
+	}
+
+	return i2c_probe(adapter, &addr_data, &detect);
+}
+
+static int detach(struct i2c_client *client)
+{
+	int ret = i2c_detach_client(client);
+	kfree(client);
+	return ret;
+}
+
+static struct i2c_driver driver = {
+	.owner	= THIS_MODULE,
+	.name	= "tda9840",
+	.id	= I2C_DRIVERID_TDA9840,
+	.flags	= I2C_DF_NOTIFY,
+	.attach_adapter	= attach,
+	.detach_client	= detach,
+	.command	= command,
+};
+
+static struct i2c_client client_template = {
+	I2C_DEVNAME("tda9840"),
+	.driver = &driver,
+};
+
+static int __init this_module_init(void)
+{
+	return i2c_add_driver(&driver);
+}
+
+static void __exit this_module_exit(void)
+{
+	i2c_del_driver(&driver);
+}
+
+module_init(this_module_init);
+module_exit(this_module_exit);
+
+MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
+MODULE_DESCRIPTION("tda9840 driver");
+MODULE_LICENSE("GPL");