/*
- tea6415c.h - i2c-driver for the tea6415c by SGS Thomson
+ tea6415c - i2c-driver for the tea6415c by SGS Thomson
Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
with 8 inputs and 6 outputs.
It is cascadable, i.e. it can be found at the addresses
0x86 and 0x06 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 vs 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 Mvss 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 "tea6415c.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 TEA6415C_NUM_INPUTS 8
#define TEA6415C_NUM_OUTPUTS 6
/* addresses to scan, found only at 0x03 and/or 0x43 (7-bit) */
-static unsigned short normal_i2c[] = {I2C_TEA6415C_1, I2C_TEA6415C_2, I2C_CLIENT_END};
-static unsigned short normal_i2c_range[] = {I2C_CLIENT_END};
+static unsigned short normal_i2c[] = { I2C_TEA6415C_1, I2C_TEA6415C_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 tea6415c_id = 0;
/* this function is called by i2c_probe */
-static int tea6415c_detect(struct i2c_adapter *adapter, int address, int kind)
+static int detect(struct i2c_adapter *adapter, int address, int kind)
{
- struct i2c_client *client = NULL;
+ struct i2c_client *client = NULL;
int err = 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, 0, sizeof(struct i2c_client));
/* fill client structure */
- sprintf(client->name,"tea6415c (0x%02x)", address);
+ memcpy(client, &client_template, sizeof(struct i2c_client));
client->id = tea6415c_id++;
- client->flags = 0;
client->addr = address;
client->adapter = adapter;
- client->driver = &driver;
/* tell the i2c layer a new client has arrived */
if (0 != (err = i2c_attach_client(client))) {
return err;
}
- printk("tea6415c.o: detected @ 0x%02x on adapter %s\n",2*address,&client->adapter->name[0]);
+ printk("tea6415c: detected @ 0x%02x on adapter %s\n", address, &client->adapter->name[0]);
return 0;
}
-static int tea6415c_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("tea6415c.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,&tea6415c_detect);
+ return i2c_probe(adapter, &addr_data, &detect);
}
-static int tea6415c_detach(struct i2c_client *client)
+static int detach(struct i2c_client *client)
{
- int err = 0;
-
- if ( 0 != (err = i2c_detach_client(client))) {
- printk("tea6415c.o: Client deregistration failed, client not detached.\n");
- return err;
- }
-
+ int ret = i2c_detach_client(client);
kfree(client);
-
- return 0;
+ return ret;
}
/* makes a connection between the input-pin 'i' and the output-pin 'o'
for the tea6415c-client 'client' */
-static int tea6415c_switch(struct i2c_client *client, int i, int o)
+static int switch_matrix(struct i2c_client *client, int i, int o)
{
- u8 byte = 0;
+ u8 byte = 0;
+ int ret;
- dprintk("tea6415c.o: tea6415c_switch: adr:0x%02x, i:%d, o:%d\n", client->addr, i, o);
-
+ dprintk("adr:0x%02x, i:%d, o:%d\n", client->addr, i, o);
+
/* check if the pins are valid */
- if ( 0 == (( 1 == i || 3 == i || 5 == i || 6 == i || 8 == i || 10 == i || 20 == i || 11 == i ) &&
- (18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o )))
+ if (0 == ((1 == i || 3 == i || 5 == i || 6 == i || 8 == i || 10 == i || 20 == i || 11 == i)
+ && (18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o)))
return -1;
/* to understand this, have a look at the tea6415c-specs (p.5) */
- switch(o) {
- case 18:
- byte = 0x00;
- break;
- case 14:
- byte = 0x20;
- break;
- case 16:
- byte = 0x10;
- break;
- case 17:
- byte = 0x08;
- break;
- case 15:
- byte = 0x18;
- break;
- case 13:
- byte = 0x28;
- break;
+ switch (o) {
+ case 18:
+ byte = 0x00;
+ break;
+ case 14:
+ byte = 0x20;
+ break;
+ case 16:
+ byte = 0x10;
+ break;
+ case 17:
+ byte = 0x08;
+ break;
+ case 15:
+ byte = 0x18;
+ break;
+ case 13:
+ byte = 0x28;
+ break;
};
-
- switch(i) {
- case 5:
- byte |= 0x00;
- break;
- case 8:
- byte |= 0x04;
- break;
- case 3:
- byte |= 0x02;
- break;
- case 20:
- byte |= 0x06;
- break;
- case 6:
- byte |= 0x01;
- break;
- case 10:
- byte |= 0x05;
- break;
- case 1:
- byte |= 0x03;
- break;
- case 11:
- byte |= 0x07;
- break;
+
+ switch (i) {
+ case 5:
+ byte |= 0x00;
+ break;
+ case 8:
+ byte |= 0x04;
+ break;
+ case 3:
+ byte |= 0x02;
+ break;
+ case 20:
+ byte |= 0x06;
+ break;
+ case 6:
+ byte |= 0x01;
+ break;
+ case 10:
+ byte |= 0x05;
+ break;
+ case 1:
+ byte |= 0x03;
+ break;
+ case 11:
+ byte |= 0x07;
+ break;
};
- if ( 0 != i2c_smbus_write_byte(client,byte)) {
- dprintk("tea6415c.o: tea6415c_switch: could not write to tea6415c\n");
- return -1;
+ ret = i2c_smbus_write_byte(client, byte);
+ if (ret) {
+ dprintk("i2c_smbus_write_byte() failed, ret:%d\n", ret);
+ return -EIO;
}
- return 0;
+ return ret;
}
-static int tea6415c_command(struct i2c_client *client, unsigned int cmd, void* arg)
+static int command(struct i2c_client *client, unsigned int cmd, void *arg)
{
- struct tea6415c_multiplex *v = (struct tea6415c_multiplex*)arg;
+ struct tea6415c_multiplex *v = (struct tea6415c_multiplex *)arg;
int result = 0;
switch (cmd) {
- case TEA6415C_SWITCH: {
- result = tea6415c_switch(client,v->in,v->out);
- break;
- }
- default: {
- return -ENOIOCTLCMD;
- }
+ case TEA6415C_SWITCH:
+ result = switch_matrix(client, v->in, v->out);
+ break;
+ default:
+ return -ENOIOCTLCMD;
}
- if ( 0 != result )
- return result;
-
- return 0;
+ return result;
}
static struct i2c_driver driver = {
- .owner = THIS_MODULE,
- .name = "tea6415c driver",
- .id = I2C_DRIVERID_TEA6415C,
- .flags = I2C_DF_NOTIFY,
- .attach_adapter = tea6415c_attach,
- .detach_client = tea6415c_detach,
- .command = tea6415c_command,
+ .owner = THIS_MODULE,
+ .name = "tea6415c",
+ .id = I2C_DRIVERID_TEA6415C,
+ .flags = I2C_DF_NOTIFY,
+ .attach_adapter = attach,
+ .detach_client = detach,
+ .command = command,
+};
+
+static struct i2c_client client_template = {
+ I2C_DEVNAME("tea6415c"),
+ .driver = &driver,
};
-static int __init tea6415c_init_module(void)
+static int __init this_module_init(void)
{
return i2c_add_driver(&driver);
}
-static void __exit tea6415c_cleanup_module(void)
+static void __exit this_module_exit(void)
{
- i2c_del_driver(&driver);
+ i2c_del_driver(&driver);
}
-module_init(tea6415c_init_module);
-module_exit(tea6415c_cleanup_module);
+module_init(this_module_init);
+module_exit(this_module_exit);
MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
MODULE_DESCRIPTION("tea6415c driver");
MODULE_LICENSE("GPL");
-
git://git.onelab.eu / linux-2.6.git / blobdiff