/*
- tea6420.o - i2c-driver for the tea6420 by SGS Thomson
+ tea6420 - i2c-driver for the tea6420 by SGS Thomson
Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
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
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/version.h>
#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/poll.h>
-#include <linux/slab.h>
+#include <linux/ioctl.h>
#include <linux/i2c.h>
-#include <linux/init.h>
#include "tea6420.h"
-static int debug = 0; /* insmod parameter */
-MODULE_PARM(debug,"i");
-#define dprintk if (debug) printk
+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};
+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;
/* unique ID allocation */
static int tea6420_id = 0;
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 result = 0;
-
- dprintk("tea6420.o: tea6420_switch: adr:0x%02x, i:%d, o:%d, g:%d\n",client->addr,i,o,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 )
+ 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);
+ 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;
+ switch (g) {
+ case 0:
+ byte |= (3 << 3);
+ break;
+ case 2:
+ byte |= (2 << 3);
+ break;
+ case 4:
+ byte |= (1 << 3);
+ break;
+ case 6:
+ break;
}
- /* fixme?: 1 != ... => 0 != */
- if ( 0 != (result = i2c_smbus_write_byte(client,byte))) {
- printk("tea6402:%d\n",result);
- dprintk(KERN_ERR "tea6420.o: could not switch, result:%d\n",result);
- return -EFAULT;
+ 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;
+ 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)) {
+ 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) {
+ if (0 == client) {
return -ENOMEM;
}
- memset(client, 0x0, sizeof(struct i2c_client));
+ memset(client, 0x0, sizeof(struct i2c_client));
/* fill client structure */
- sprintf(client->name,"tea6420 (0x%02x)", address);
+ memcpy(client, &client_template, sizeof(struct i2c_client));
client->id = tea6420_id++;
- client->flags = 0;
client->addr = address;
client->adapter = adapter;
- client->driver = &driver;
- i2c_set_clientdata(client, NULL);
/* tell the i2c layer a new client has arrived */
if (0 != (err = i2c_attach_client(client))) {
/* set initial values: set "mute"-input to all outputs at gain 0 */
err = 0;
- for(i = 1; i < 5; i++) {
+ for (i = 1; i < 5; i++) {
err += tea6420_switch(client, 6, i, 0);
}
- if( 0 != err) {
- printk("tea6420.o: could not initialize chipset. continuing anyway.\n");
+ if (err) {
+ dprintk("could not initialize tea6420\n");
+ kfree(client);
+ return -ENODEV;
}
-
- printk("tea6420.o: detected @ 0x%02x on adapter %s\n",2*address,&client->adapter->name[0]);
+
+ printk("tea6420: detected @ 0x%02x on adapter %s\n", address, &client->adapter->name[0]);
return 0;
}
-static int tea6420_attach(struct i2c_adapter *adapter)
+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("tea6420.o: refusing to probe on unknown adapter [name='%s',id=0x%x]\n",adapter->name,adapter->id);
+ 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);
+ return i2c_probe(adapter, &addr_data, &tea6420_detect);
}
-static int tea6420_detach(struct i2c_client *client)
+static int detach(struct i2c_client *client)
{
- int err = 0;
-
- if ( 0 != (err = i2c_detach_client(client))) {
- printk("tea6420.o: Client deregistration failed, client not detached.\n");
- return err;
- }
-
+ int ret = i2c_detach_client(client);
kfree(client);
-
- return 0;
+ return ret;
}
-static int tea6420_command(struct i2c_client *client, unsigned int cmd, void* arg)
+static int command(struct i2c_client *client, unsigned int cmd, void *arg)
{
- struct tea6420_multiplex *a = (struct tea6420_multiplex*)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;
- }
+ case TEA6420_SWITCH:
+ result = tea6420_switch(client, a->in, a->out, a->gain);
+ break;
+ default:
+ return -ENOIOCTLCMD;
}
- if ( 0 != result )
- return result;
-
- return 0;
+ return result;
}
static struct i2c_driver driver = {
- .owner = THIS_MODULE,
- .name = "tea6420 driver",
- .id = I2C_DRIVERID_TEA6420,
- .flags = I2C_DF_NOTIFY,
- .attach_adapter = tea6420_attach,
- .detach_client = tea6420_detach,
- .command = tea6420_command,
+ .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 tea6420_init_module(void)
+static int __init this_module_init(void)
{
return i2c_add_driver(&driver);
}
-static void __exit tea6420_cleanup_module(void)
+static void __exit this_module_exit(void)
{
- i2c_del_driver(&driver);
+ i2c_del_driver(&driver);
}
-module_init(tea6420_init_module);
-module_exit(tea6420_cleanup_module);
+module_init(this_module_init);
+module_exit(this_module_exit);
MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
MODULE_DESCRIPTION("tea6420 driver");
git://git.onelab.eu / linux-2.6.git / blobdiff