Initial import of modified Linux 2.6.28 tree

Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y

1 files changed, 227 insertions, 0 deletions

diff --git a/drivers/media/video/tda9840.c b/drivers/media/video/tda9840.c
new file mode 100644
index 0000000..1c391f0
--- /dev/null
+++ b/drivers/media/video/tda9840.c
@@ -0,0 +1,227 @@
+ /*
+    tda9840 - i2c-driver for the tda9840 by SGS Thomson
+
+    Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
+    Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
+
+    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 <media/v4l2-common.h>
+#include <media/v4l2-i2c-drv-legacy.h>
+#include "tda9840.h"
+
+MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
+MODULE_DESCRIPTION("tda9840 driver");
+MODULE_LICENSE("GPL");
+
+static int debug;
+module_param(debug, int, 0644);
+
+MODULE_PARM_DESC(debug, "Debug level (0-1)");
+
+#define	SWITCH		0x00
+#define	LEVEL_ADJUST	0x02
+#define	STEREO_ADJUST	0x03
+#define	TEST		0x04
+
+#define TDA9840_SET_MUTE                0x00
+#define TDA9840_SET_MONO                0x10
+#define TDA9840_SET_STEREO              0x2a
+#define TDA9840_SET_LANG1               0x12
+#define TDA9840_SET_LANG2               0x1e
+#define TDA9840_SET_BOTH                0x1a
+#define TDA9840_SET_BOTH_R              0x16
+#define TDA9840_SET_EXTERNAL            0x7a
+
+/* addresses to scan, found only at 0x42 (7-Bit) */
+static unsigned short normal_i2c[] = { I2C_ADDR_TDA9840, I2C_CLIENT_END };
+
+/* magic definition of all other variables and things */
+I2C_CLIENT_INSMOD;
+
+static void tda9840_write(struct i2c_client *client, u8 reg, u8 val)
+{
+	if (i2c_smbus_write_byte_data(client, reg, val))
+		v4l_dbg(1, debug, client, "error writing %02x to %02x\n",
+				val, reg);
+}
+
+static int tda9840_command(struct i2c_client *client, unsigned cmd, void *arg)
+{
+	int byte = *(int *)arg;
+
+	switch (cmd) {
+	case VIDIOC_S_TUNER: {
+		struct v4l2_tuner *t = arg;
+		int byte;
+
+		if (t->index)
+			return -EINVAL;
+
+		switch (t->audmode) {
+		case V4L2_TUNER_MODE_STEREO:
+			byte = TDA9840_SET_STEREO;
+			break;
+		case V4L2_TUNER_MODE_LANG1_LANG2:
+			byte = TDA9840_SET_BOTH;
+			break;
+		case V4L2_TUNER_MODE_LANG1:
+			byte = TDA9840_SET_LANG1;
+			break;
+		case V4L2_TUNER_MODE_LANG2:
+			byte = TDA9840_SET_LANG2;
+			break;
+		default:
+			byte = TDA9840_SET_MONO;
+			break;
+		}
+		v4l_dbg(1, debug, client, "TDA9840_SWITCH: 0x%02x\n", byte);
+		tda9840_write(client, SWITCH, byte);
+		break;
+	}
+
+	case VIDIOC_G_TUNER: {
+		struct v4l2_tuner *t = arg;
+		u8 byte;
+
+		t->rxsubchans = V4L2_TUNER_SUB_MONO;
+		if (1 != i2c_master_recv(client, &byte, 1)) {
+			v4l_dbg(1, debug, client,
+				"i2c_master_recv() failed\n");
+			return -EIO;
+		}
+
+		if (byte & 0x80) {
+			v4l_dbg(1, debug, client,
+				"TDA9840_DETECT: register contents invalid\n");
+			return -EINVAL;
+		}
+
+		v4l_dbg(1, debug, client, "TDA9840_DETECT: byte: 0x%02x\n", byte);
+
+		switch (byte & 0x60) {
+		case 0x00:
+			t->rxsubchans = V4L2_TUNER_SUB_MONO;
+			break;
+		case 0x20:
+			t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
+			break;
+		case 0x40:
+			t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO;
+			break;
+		default: /* Incorrect detect */
+			t->rxsubchans = V4L2_TUNER_MODE_MONO;
+			break;
+		}
+		break;
+	}
+
+	case TDA9840_LEVEL_ADJUST:
+		v4l_dbg(1, debug, client, "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;
+		tda9840_write(client, LEVEL_ADJUST, byte);
+		break;
+
+	case TDA9840_STEREO_ADJUST:
+		v4l_dbg(1, debug, client, "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;
+
+		tda9840_write(client, STEREO_ADJUST, byte);
+		break;
+	default:
+		return -ENOIOCTLCMD;
+	}
+
+	return 0;
+}
+
+static int tda9840_probe(struct i2c_client *client,
+			  const struct i2c_device_id *id)
+{
+	int result;
+	int byte;
+
+	/* let's see whether this adapter can support what we need */
+	if (!i2c_check_functionality(client->adapter,
+			I2C_FUNC_SMBUS_READ_BYTE_DATA |
+			I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
+		return 0;
+
+	v4l_info(client, "chip found @ 0x%x (%s)\n",
+			client->addr << 1, client->adapter->name);
+
+	/* set initial values for level & stereo - adjustment, mode */
+	byte = 0;
+	result = tda9840_command(client, TDA9840_LEVEL_ADJUST, &byte);
+	result += tda9840_command(client, TDA9840_STEREO_ADJUST, &byte);
+	tda9840_write(client, SWITCH, TDA9840_SET_STEREO);
+	if (result) {
+		v4l_dbg(1, debug, client, "could not initialize tda9840\n");
+		return -ENODEV;
+	}
+	return 0;
+}
+
+static int tda9840_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 tda9840_id[] = {
+	{ "tda9840", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, tda9840_id);
+
+static struct v4l2_i2c_driver_data v4l2_i2c_data = {
+	.name = "tda9840",
+	.driverid = I2C_DRIVERID_TDA9840,
+	.command = tda9840_command,
+	.probe = tda9840_probe,
+	.legacy_probe = tda9840_legacy_probe,
+	.id_table = tda9840_id,
+};