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.
#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"
-static int debug = 0; /* insmod parameter */
+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, "Turn on/off device debugging (default:off).");
-#define dprintk(args...) \
- do { if (debug) { printk("%s: %s()[%d]: ", KBUILD_MODNAME, __FUNCTION__, __LINE__); printk(args); } } while (0)
+
+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 struct i2c_driver driver;
-static struct i2c_client client_template;
+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 command(struct i2c_client *client, unsigned int cmd, void *arg)
+static int tda9840_command(struct i2c_client *client, unsigned 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) {
+ 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;
- result = i2c_smbus_write_byte_data(client, SWITCH, byte);
- if (result)
- dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result);
+ 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:
-
- dprintk("TDA9840_LEVEL_ADJUST: %d\n", byte);
+ v4l_dbg(1, debug, client, "TDA9840_LEVEL_ADJUST: %d\n", byte);
/* check for correct range */
if (byte > 25 || byte < -20)
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);
+ tda9840_write(client, LEVEL_ADJUST, byte);
break;
case TDA9840_STEREO_ADJUST:
-
- dprintk("TDA9840_STEREO_ADJUST: %d\n", byte);
+ v4l_dbg(1, debug, client, "TDA9840_STEREO_ADJUST: %d\n", byte);
/* check for correct range */
if (byte > 25 || byte < -24)
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);
+ tda9840_write(client, STEREO_ADJUST, byte);
break;
default:
return -ENOIOCTLCMD;
}
- if (result)
- return -EIO;
-
return 0;
}
-static int detect(struct i2c_adapter *adapter, int address, int kind)
+static int tda9840_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
{
- struct i2c_client *client;
- int result = 0;
-
- int byte = 0x0;
+ int result;
+ int byte;
/* 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)) {
+ if (!i2c_check_functionality(client->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;
- }
+ 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 = command(client, TDA9840_LEVEL_ADJUST, &byte);
- result += command(client, TDA9840_STEREO_ADJUST, &byte);
- byte = TDA9840_SET_MONO;
- result = command(client, TDA9840_SWITCH, &byte);
+ 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) {
- dprintk("could not initialize tda9840\n");
+ v4l_dbg(1, debug, client, "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)
+static int tda9840_legacy_probe(struct i2c_adapter *adapter)
{
- /* let's see whether this is a know adapter we can attach to */
- if (adapter->id != I2C_HW_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;
+ /* 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 struct i2c_driver driver = {
- .driver = {
- .name = "tda9840",
- },
- .id = I2C_DRIVERID_TDA9840,
- .attach_adapter = attach,
- .detach_client = detach,
- .command = command,
+static const struct i2c_device_id tda9840_id[] = {
+ { "tda9840", 0 },
+ { }
};
+MODULE_DEVICE_TABLE(i2c, tda9840_id);
-static struct i2c_client client_template = {
+static struct v4l2_i2c_driver_data v4l2_i2c_data = {
.name = "tda9840",
- .driver = &driver,
+ .driverid = I2C_DRIVERID_TDA9840,
+ .command = tda9840_command,
+ .probe = tda9840_probe,
+ .legacy_probe = tda9840_legacy_probe,
+ .id_table = tda9840_id,
};
-
-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");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff