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
+ It is cascadable, i.e. it can be found at the addresses 0x98
and 0x9a on the i2c-bus.
For detailed informations download the specifications directly
#include <linux/module.h>
#include <linux/ioctl.h>
+#include <linux/slab.h>
#include <linux/i2c.h>
-
+#include <media/v4l2-device.h>
+#include <media/v4l2-chip-ident.h>
+#include <media/v4l2-i2c-drv.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]: ", KBUILD_MODNAME, __FUNCTION__, __LINE__); printk(args); } } while (0)
+MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
+MODULE_DESCRIPTION("tea6420 driver");
+MODULE_LICENSE("GPL");
-/* 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 int debug;
+module_param(debug, int, 0644);
-/* magic definition of all other variables and things */
-I2C_CLIENT_INSMOD;
+MODULE_PARM_DESC(debug, "Debug level (0-1)");
-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)
+ with gain 'g' (note: i = 6 means 'mute') */
+static int tea6420_s_routing(struct v4l2_subdev *sd,
+ u32 i, u32 o, u32 config)
{
- u8 byte = 0;
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+ int g = (o >> 4) & 0xf;
+ u8 byte;
int ret;
- dprintk("adr:0x%02x, i:%d, o:%d, g:%d\n", client->addr, i, o, g);
+ o &= 0xf;
+ v4l2_dbg(1, debug, sd, "i=%d, o=%d, g=%d\n", i, o, g);
- /* check if the paramters are valid */
+ /* check if the parameters are valid */
if (i < 1 || i > 6 || o < 1 || o > 4 || g < 0 || g > 6 || g % 2 != 0)
- return -1;
+ return -EINVAL;
- byte = ((o - 1) << 5);
+ byte = ((o - 1) << 5);
byte |= (i - 1);
/* to understand this, have a look at the tea6420-specs (p.5) */
ret = i2c_smbus_write_byte(client, byte);
if (ret) {
- dprintk("i2c_smbus_write_byte() failed, ret:%d\n", ret);
+ v4l2_dbg(1, debug, sd,
+ "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)
+static int tea6420_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
{
- struct i2c_client *client;
- int err = 0, i = 0;
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
- /* let's see whether this adapter can support what we need */
- if (0 == i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WRITE_BYTE)) {
- return 0;
- }
+ return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEA6420, 0);
+}
- /* allocate memory for client structure */
- client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
- if (0 == client) {
- return -ENOMEM;
- }
+/* ----------------------------------------------------------------------- */
+
+static const struct v4l2_subdev_core_ops tea6420_core_ops = {
+ .g_chip_ident = tea6420_g_chip_ident,
+};
- /* fill client structure */
- memcpy(client, &client_template, sizeof(struct i2c_client));
- client->addr = address;
- client->adapter = adapter;
+static const struct v4l2_subdev_audio_ops tea6420_audio_ops = {
+ .s_routing = tea6420_s_routing,
+};
- /* tell the i2c layer a new client has arrived */
- if (0 != (err = i2c_attach_client(client))) {
- kfree(client);
- return err;
- }
+static const struct v4l2_subdev_ops tea6420_ops = {
+ .core = &tea6420_core_ops,
+ .audio = &tea6420_audio_ops,
+};
+
+static int tea6420_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct v4l2_subdev *sd;
+ 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);
+
+ sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
+ if (sd == NULL)
+ return -ENOMEM;
+ v4l2_i2c_subdev_init(sd, client, &tea6420_ops);
/* 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);
- }
+ for (i = 1; i < 5; i++)
+ err += tea6420_s_routing(sd, 6, i, 0);
if (err) {
- dprintk("could not initialize tea6420\n");
- kfree(client);
+ v4l_dbg(1, debug, client, "could not initialize tea6420\n");
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)
+static int tea6420_remove(struct i2c_client *client)
{
- /* 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, &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;
- }
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
- return result;
+ v4l2_device_unregister_subdev(sd);
+ kfree(sd);
+ return 0;
}
-static struct i2c_driver driver = {
- .driver = {
- .name = "tea6420",
- },
- .id = I2C_DRIVERID_TEA6420,
- .attach_adapter = attach,
- .detach_client = detach,
- .command = command,
+static const struct i2c_device_id tea6420_id[] = {
+ { "tea6420", 0 },
+ { }
};
+MODULE_DEVICE_TABLE(i2c, tea6420_id);
-static struct i2c_client client_template = {
+static struct v4l2_i2c_driver_data v4l2_i2c_data = {
.name = "tea6420",
- .driver = &driver,
+ .probe = tea6420_probe,
+ .remove = tea6420_remove,
+ .id_table = tea6420_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("tea6420 driver");
-MODULE_LICENSE("GPL");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff