Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 200 insertions, 0 deletions

diff --git a/drivers/media/video/tea6420.c b/drivers/media/video/tea6420.c
new file mode 100644
index 000000000000..bd10710fd909
--- /dev/null
+++ b/drivers/media/video/tea6420.c
@@ -0,0 +1,200 @@
+ /*
+    tea6420 - i2c-driver for the tea6420 by SGS Thomson
+
+    Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
+
+    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 "tea6420.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)
+
+/* addresses to scan, found only at 0x4c and/or 0x4d (7-Bit) */
+static unsigned short normal_i2c[] = { I2C_TEA6420_1, I2C_TEA6420_2, 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;
+
+/* 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 = 0;
+	int ret;
+
+	dprintk("adr:0x%02x, i:%d, o:%d, g:%d\n", client->addr, i, o, g);
+
+	/* check if the paramters 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) {
+		dprintk("i2c_smbus_write_byte() failed, ret:%d\n", ret);
+		return -EIO;
+	}
+	
+	return 0;
+}
+
+/* this function is called by i2c_probe */
+static int tea6420_detect(struct i2c_adapter *adapter, int address, int kind)
+{
+	struct i2c_client *client;
+	int err = 0, i = 0;
+
+	/* let's see whether this adapter can support what we need */
+	if (0 == i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WRITE_BYTE)) {
+		return 0;
+	}
+
+	/* allocate memory for client structure */
+	client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
+	if (0 == client) {
+		return -ENOMEM;
+	}
+	memset(client, 0x0, sizeof(struct i2c_client));
+
+	/* 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 != (err = i2c_attach_client(client))) {
+		kfree(client);
+		return err;
+	}
+
+	/* 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) {
+		dprintk("could not initialize tea6420\n");
+		kfree(client);
+		return -ENODEV;
+	}
+
+	printk("tea6420: 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, &tea6420_detect);
+}
+
+static int detach(struct i2c_client *client)
+{
+	int ret = i2c_detach_client(client);
+	kfree(client);
+	return ret;
+}
+
+static int command(struct i2c_client *client, unsigned int 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;
+}
+
+static struct i2c_driver driver = {
+	.owner	= THIS_MODULE,
+	.name	= "tea6420",
+	.id	= I2C_DRIVERID_TEA6420,
+	.flags	= I2C_DF_NOTIFY,
+	.attach_adapter	= attach,
+	.detach_client	= detach,
+	.command	= command,
+};
+
+static struct i2c_client client_template = {
+	I2C_DEVNAME("tea6420"),
+	.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("tea6420 driver");
+MODULE_LICENSE("GPL");