/*
- tda9840.h - i2c-driver for the tda9840 by SGS Thomson
+ tda9840 - i2c-driver for the tda9840 by SGS Thomson
Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
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 "tda9840.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)
#define SWITCH 0x00
#define LEVEL_ADJUST 0x02
#define TEST 0x04
/* addresses to scan, found only at 0x42 (7-Bit) */
-static unsigned short normal_i2c[] = {I2C_TDA9840, I2C_CLIENT_END};
-static unsigned short normal_i2c_range[] = {I2C_CLIENT_END};
+static unsigned short normal_i2c[] = { I2C_TDA9840, 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 tda9840_id = 0;
-static struct i2c_driver driver;
-
-static int tda9840_command(struct i2c_client *client, unsigned int cmd, void* arg)
+static int command(struct i2c_client *client, unsigned int cmd, void *arg)
{
- int result = 0;
+ int result;
+ int byte = *(int *)arg;
switch (cmd) {
- case TDA9840_SWITCH:
- {
- int byte = *(int*)arg;
-
- dprintk("tda9840.o: 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 ) {
- return -EINVAL;
- }
-
- if ( 0 != (result = i2c_smbus_write_byte_data(client, SWITCH, byte))) {
- printk("tda9840.o: TDA9840_SWITCH error.\n");
- return -EFAULT;
- }
-
- return 0;
+ 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) {
+ return -EINVAL;
}
- case TDA9840_LEVEL_ADJUST:
- {
- int byte = *(int*)arg;
-
- dprintk("tda9840.o: 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;
-
- if ( 0 != (result = i2c_smbus_write_byte_data(client, LEVEL_ADJUST, byte))) {
- printk("tda9840.o: TDA9840_LEVEL_ADJUST error.\n");
- return -EFAULT;
- }
-
- return 0;
- }
+ result = i2c_smbus_write_byte_data(client, SWITCH, byte);
+ if (result)
+ dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result);
+ break;
- case TDA9840_STEREO_ADJUST:
- {
- int byte = *(int*)arg;
-
- dprintk("tda9840.o: 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;
-
- if ( 0 != (result = i2c_smbus_write_byte_data(client, STEREO_ADJUST, byte))) {
- printk("tda9840.o: TDA9840_STEREO_ADJUST error.\n");
- return -EFAULT;
- }
-
- return 0;
- }
+ case TDA9840_LEVEL_ADJUST:
- case TDA9840_DETECT:
- {
- int byte = 0x0;
+ dprintk("TDA9840_LEVEL_ADJUST: %d\n", byte);
- if ( -1 == (byte = i2c_smbus_read_byte_data(client, STEREO_ADJUST))) {
- printk("tda9840.o: TDA9840_DETECT error while reading.\n");
- return -EFAULT;
- }
+ /* check for correct range */
+ if (byte > 25 || byte < -20)
+ return -EINVAL;
- if( 0 != (byte & 0x80)) {
- dprintk("tda9840.o: TDA9840_DETECT, register contents invalid.\n");
- return -EFAULT;
- }
+ /* calculate actual value to set, see specs, page 18 */
+ byte /= 5;
+ if (0 < byte)
+ byte += 0x8;
+ else
+ byte = -byte;
- dprintk("tda9840.o: TDA9840_DETECT, result: 0x%02x (original byte)\n",byte);
+ result = i2c_smbus_write_byte_data(client, LEVEL_ADJUST, byte);
+ if (result)
+ dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result);
+ break;
- return ((byte & 0x60) >> 5);
- }
+ case TDA9840_STEREO_ADJUST:
+
+ dprintk("TDA9840_STEREO_ADJUST: %d\n", byte);
- case TDA9840_TEST:
- {
- int byte = *(int*)arg;
+ /* check for correct range */
+ if (byte > 25 || byte < -24)
+ return -EINVAL;
- dprintk("tda9840.o: TDA9840_TEST: 0x%02x\n",byte);
+ /* calculate actual value to set */
+ byte /= 5;
+ if (0 < byte)
+ byte += 0x20;
+ else
+ byte = -byte;
- /* mask out irrelevant bits */
- byte &= 0x3;
+ result = i2c_smbus_write_byte_data(client, STEREO_ADJUST, byte);
+ if (result)
+ dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result);
+ break;
- if ( 0 != (result = i2c_smbus_write_byte_data(client, TEST, byte))) {
- printk("tda9840.o: TDA9840_TEST error.\n");
- return -EFAULT;
- }
-
- return 0;
+ case TDA9840_DETECT:
+
+ byte = i2c_smbus_read_byte_data(client, STEREO_ADJUST);
+ if (byte == -1) {
+ dprintk("i2c_smbus_read_byte_data() failed\n");
+ return -EIO;
}
- default:
- return -ENOIOCTLCMD;
+ if (0 != (byte & 0x80)) {
+ dprintk("TDA9840_DETECT: register contents invalid\n");
+ return -EINVAL;
+ }
+
+ dprintk("TDA9840_DETECT: byte: 0x%02x\n", byte);
+ return ((byte & 0x60) >> 5);
+
+ 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);
+ break;
+ default:
+ return -ENOIOCTLCMD;
}
+ if (result)
+ return -EIO;
+
return 0;
}
-static int tda9840_detect(struct i2c_adapter *adapter, int address, int kind)
+static int detect(struct i2c_adapter *adapter, int address, int kind)
{
- struct i2c_client *client;
+ struct i2c_client *client;
int result = 0;
int byte = 0x0;
-
+
/* 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 (0 == i2c_check_functionality(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("tda9840.o: not enough kernel memory.\n");
+ if (0 == client) {
+ printk("not enough kernel memory\n");
return -ENOMEM;
}
- memset(client, 0, sizeof(struct i2c_client));
-
+
/* fill client structure */
- sprintf(client->name,"tda9840 (0x%02x)", address);
+ memcpy(client, &client_template, sizeof(struct i2c_client));
client->id = tda9840_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 != (result = i2c_attach_client(client))) {
/* set initial values for level & stereo - adjustment, mode */
byte = 0;
- if ( 0 != (result = tda9840_command(client, TDA9840_LEVEL_ADJUST, &byte))) {
- printk("tda9840.o: could not initialize ic #1. continuing anyway. (result:%d)\n",result);
- }
-
- if ( 0 != (result = tda9840_command(client, TDA9840_STEREO_ADJUST, &byte))) {
- printk("tda9840.o: could not initialize ic #2. continuing anyway. (result:%d)\n",result);
- }
-
+ result = command(client, TDA9840_LEVEL_ADJUST, &byte);
+ result += command(client, TDA9840_STEREO_ADJUST, &byte);
byte = TDA9840_SET_MONO;
- if ( 0 != (result = tda9840_command(client, TDA9840_SWITCH, &byte))) {
- printk("tda9840.o: could not initialize ic #3. continuing anyway. (result:%d)\n",result);
- }
-
- printk("tda9840.o: detected @ 0x%02x on adapter %s\n",2*address,&client->adapter->name[0]);
+ result = command(client, TDA9840_SWITCH, &byte);
+ if (result) {
+ dprintk("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 tda9840_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("tda9840.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,&tda9840_detect);
+ return i2c_probe(adapter, &addr_data, &detect);
}
-static int tda9840_detach(struct i2c_client *client)
+static int detach(struct i2c_client *client)
{
- int err = 0;
-
- if ( 0 != (err = i2c_detach_client(client))) {
- printk("tda9840.o: Client deregistration failed, client not detached.\n");
- return err;
- }
-
+ int ret = i2c_detach_client(client);
kfree(client);
-
- return 0;
+ return ret;
}
static struct i2c_driver driver = {
- .owner = THIS_MODULE,
- .name = "tda9840 driver",
- .id = I2C_DRIVERID_TDA9840,
- .flags = I2C_DF_NOTIFY,
- .attach_adapter = tda9840_attach,
- .detach_client = tda9840_detach,
- .command = tda9840_command,
+ .owner = THIS_MODULE,
+ .name = "tda9840",
+ .id = I2C_DRIVERID_TDA9840,
+ .flags = I2C_DF_NOTIFY,
+ .attach_adapter = attach,
+ .detach_client = detach,
+ .command = command,
+};
+
+static struct i2c_client client_template = {
+ I2C_DEVNAME("tda9840"),
+ .driver = &driver,
};
-static int __init tda9840_init_module(void)
+static int __init this_module_init(void)
{
- return i2c_add_driver(&driver);
+ return i2c_add_driver(&driver);
}
-static void __exit tda9840_cleanup_module(void)
+static void __exit this_module_exit(void)
{
- i2c_del_driver(&driver);
+ i2c_del_driver(&driver);
}
-module_init(tda9840_init_module);
-module_exit(tda9840_cleanup_module);
+module_init(this_module_init);
+module_exit(this_module_exit);
MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
MODULE_DESCRIPTION("tda9840 driver");
git://git.onelab.eu / linux-2.6.git / blobdiff