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lm-sensors/kernel/i2c-dev.c
Frodo Looijaard a775db2fcc Completed i2c-dev. Not tested yet. 
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@160 7894878c-1315-0410-8ee3-d5d059ff63e0
1999-01-13 19:07:57 +00:00

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/*
i2c-dev.c - Part of lm_sensors, Linux kernel modules for hardware
monitoring
Copyright (c) 1995-1997, 1999 by Frodo Looijaard <frodol@dds.nl> and
Simon Vogl
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
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
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.
*/
/* Note that this is a complete rewrite of Simon Vogl's i2c-dev module.
But I have used so much of his original code and ideas that it seems
only fair to recognize him as co-author -- Frodo */
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/malloc.h>
#include "compat.h"
#include "i2c.h"
#include "smbus.h"
#include "isa.h"
#include "sensors.h"
#include "version.h"
#include "i2c-dev.h"
#ifdef MODULE
extern int init_module(void);
extern int cleanup_module(void);
#endif /* def MODULE */
/* struct file_operations changed too often in the 2.1 series for nice code */
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,70))
static loff_t i2cdev_lseek (struct file *file, loff_t offset, int origin);
#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,56))
static long long i2cdev_lseek (struct file *file, long long offset, int origin);
#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,0))
static long long i2cdev_llseek (struct inode *inode, struct file *file,
long long offset, int origin);
#else
static int i2cdev_lseek (struct inode *inode, struct file *file, off_t offset,
int origin);
#endif
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,70))
static ssize_t i2cdev_read (struct file *file, char *buf, size_t count,
loff_t *offset);
static ssize_t i2cdev_write (struct file *file, const char *buf, size_t count,
loff_t *offset);
#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,0))
static long i2cdev_read (struct inode *inode, struct file *file, char *buf,
unsigned long count);
static long i2cdev_write (struct inode *inode, struct file *file,
const char *buf, unsigned long offset);
#else
static int i2cdev_read(struct inode *inode, struct file *file, char *buf,
int count);
static int i2cdev_write(struct inode *inode, struct file *file,
const char *buf, int count);
#endif
static int i2cdev_ioctl (struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg);
static int i2cdev_open (struct inode *inode, struct file *file);
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,31))
static int i2cdev_release (struct inode *inode, struct file *file);
#else
static void i2cdev_release (struct inode *inode, struct file *file);
#endif
static int i2cdev_attach_adapter(struct i2c_adapter *adap);
static int i2cdev_detach_client(struct i2c_client *client);
static int i2cdev_command(struct i2c_client *client, unsigned int cmd,
void *arg);
static void i2cdev_inc_use(struct i2c_client *client);
static void i2cdev_dec_use(struct i2c_client *client);
static int i2cdev_init(void);
static int i2cdev_cleanup(void);
static struct file_operations i2cdev_fops = {
i2cdev_lseek,
i2cdev_read,
i2cdev_write,
NULL, /* i2cdev_readdir */
NULL, /* i2cdev_select */
i2cdev_ioctl,
NULL, /* i2cdev_mmap */
i2cdev_open,
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,118)
NULL, /* i2cdev_flush */
#endif
i2cdev_release,
};
#define I2CDEV_CLIENTS_MAX I2C_ADAP_MAX
static struct i2c_client *i2cdev_clients[I2CDEV_CLIENTS_MAX];
static struct i2c_driver i2cdev_driver = {
/* name */ "i2c-dev dummy driver",
/* id */ I2C_DRIVERID_I2CDEV,
/* flags */ DF_NOTIFY,
/* attach_adapter */ &i2cdev_attach_adapter,
/* detach_client */ &i2cdev_detach_client,
/* command */ &i2cdev_command,
/* inc_use */ &i2cdev_inc_use,
/* dec_use */ &i2cdev_dec_use
};
static struct i2c_client i2cdev_client_template = {
/* name */ "I2C /dev entry",
/* id */ 1,
/* flags */ 0,
/* addr */ -1,
/* adapter */ NULL,
/* driver */ &i2cdev_driver,
/* data */ NULL
};
static int i2cdev_initialized;
/* Note that the lseek function is called llseek in 2.1 kernels. But things
are complicated enough as is. */
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,70))
loff_t i2cdev_lseek (struct file *file, loff_t offset, int origin)
#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,56))
long long i2cdev_lseek (struct file *file, long long offset, int origin)
#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,0))
long long i2cdev_llseek (struct inode *inode, struct file *file,
long long offset, int origin)
#else
int i2cdev_lseek (struct inode *inode, struct file *file, off_t offset,
int origin)
#endif
{
#ifdef DEBUG
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,56))
struct inode *inode = file->f_dentry->d_inode;
#endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,70)) */
printk("i2c_dev,o: i2c-%d lseek to %ld bytes relative to %d.\n",
MINOR(inode->i_rdev),offset,origin);
#endif /* DEBUG */
return -ESPIPE;
}
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,70))
static ssize_t i2cdev_read (struct file *file, char *buf, size_t count,
loff_t *offset)
#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,0))
static long i2cdev_read (struct inode *inode, struct file *file, char *buf,
unsigned long count)
#else
static int i2cdev_read(struct inode *inode, struct file *file, char *buf,
int count)
#endif
{
char *tmp;
int ret;
#ifdef DEBUG
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,70))
struct inode *inode = file->f_dentry->d_inode;
#endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,70)) */
#endif /* DEBUG */
struct i2c_client *client = (struct i2c_client *)file->private_data;
/* copy user space data to kernel space. */
tmp = kmalloc(count,GFP_KERNEL);
if (tmp==NULL)
return -ENOMEM;
#ifdef DEBUG
printk("i2c_dev,o: i2c-%d reading %d bytes.\n",MINOR(inode->i_rdev),count);
#endif
ret = i2c_master_recv(client,tmp,count);
copy_to_user(buf,tmp,count);
kfree(tmp);
return ret;
}
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,70))
static ssize_t i2cdev_write (struct file *file, const char *buf, size_t count,
loff_t *offset)
#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,0))
static long i2cdev_write (struct inode *inode, struct file *file,
const char *buf, unsigned long offset)
#else
static int i2cdev_write(struct inode *inode, struct file *file,
const char *buf, int count)
#endif
{
int ret;
char *tmp;
struct i2c_client *client = (struct i2c_client *)file->private_data;
#ifdef DEBUG
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,70))
struct inode *inode = file->f_dentry->d_inode;
#endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,70)) */
#endif /* DEBUG */
/* copy user space data to kernel space. */
tmp = kmalloc(count,GFP_KERNEL);
if (tmp==NULL)
return -ENOMEM;
copy_from_user(tmp,buf,count);
#ifdef DEBUG
printk("i2c_dev,o: i2c-%d writing %d bytes.\n",MINOR(inode->i_rdev),count);
#endif
ret = i2c_master_send(client,tmp,count);
kfree(tmp);
return ret;
}
int i2cdev_ioctl (struct inode *inode, struct file *file, unsigned int cmd,
unsigned long arg)
{
struct i2c_client *client = (struct i2c_client *)file->private_data;
struct i2c_smbus_data *data_arg;
union smbus_data temp;
int ver,datasize,res;
#ifdef DEBUG
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,70))
struct inode *inode = file->f_dentry->d_inode;
#endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,70)) */
printk("i2c_dev.o: i2c-%d ioctl, cmd: 0x%x, arg: %lx.\n",
MINOR(inode->i_rdev),cmd, arg);
#endif /* DEBUG */
switch ( cmd ) {
case I2C_SLAVE:
if (arg > 0x7f)
return -EINVAL;
client->addr = arg;
return 0;
case I2C_TENBIT:
printk("i2c-dev.o: ioctl I2C_TENBIT not (yet) supported!\n");
return -EINVAL;
case I2C_SMBUS:
if (! (data_arg = (struct i2c_smbus_data *) arg)) {
#ifdef DEBUG
printk("i2c-dev.o: NULL argument pointer in ioctl I2C_SMBUS.\n");
#endif
return -EINVAL;
}
if (verify_area(VERIFY_READ,data_arg,sizeof(struct i2c_smbus_data))) {
#ifdef DEBUG
printk("i2c-dev.o: invalid argument pointer (%p) "
"in IOCTL I2C_SMBUS.\n", data_arg);
#endif
return -EINVAL;
}
if ((data_arg->size != SMBUS_BYTE) &&
(data_arg->size != SMBUS_QUICK) &&
(data_arg->size != SMBUS_BYTE_DATA) &&
(data_arg->size != SMBUS_WORD_DATA) &&
(data_arg->size != SMBUS_PROC_CALL) &&
(data_arg->size != SMBUS_BLOCK_DATA)) {
#ifdef DEBUG
printk("i2c-dev.o: size out of range (%x) in ioctl I2C_SMBUS.\n",
data_arg->size);
#endif
return -EINVAL;
}
/* Note that SMBUS_READ and SMBUS_WRITE are 0 and 1, so the check is
valid if size==SMBUS_QUICK too. */
if ((data_arg->read_write != SMBUS_READ) &&
(data_arg->read_write != SMBUS_WRITE)) {
#ifdef DEBUG
printk("i2c-dev.o: read_write out of range (%x) in ioctl I2C_SMBUS.\n",
data_arg->read_write);
#endif
return -EINVAL;
}
/* Note that command values are always valid! */
if ((data_arg->size == SMBUS_QUICK) ||
((data_arg->size == SMBUS_BYTE) &&
(data_arg->read_write == SMBUS_WRITE)))
/* These are special: we do not use data */
return smbus_access(client->adapter, client->addr,
data_arg->read_write, data_arg->command,
data_arg->size, NULL);
if (data_arg->data == NULL) {
#ifdef DEBUG
printk("i2c-dev.o: data is NULL pointer in ioctl I2C_SMBUS.\n");
#endif
return -EINVAL;
}
/* This seems unlogical but it is not: if the user wants to read a
value, we must write that value to user memory! */
ver = (data_arg->read_write == SMBUS_WRITE)?VERIFY_READ:VERIFY_WRITE;
if ((data_arg->size == SMBUS_BYTE_DATA) || (data_arg->size == SMBUS_BYTE))
datasize = sizeof(data_arg->data->byte);
else if (data_arg->size == SMBUS_WORD_DATA)
datasize = sizeof(data_arg->data->word);
else /* size == SMBUS_BLOCK_DATA */
datasize = sizeof(data_arg->data->block);
if (verify_area(ver,data_arg->data,datasize)) {
#ifdef DEBUG
printk("i2c-dev.o: invalid pointer data (%p) in ioctl I2C_SMBUS.\n",
data_arg->data);
#endif
return -EINVAL;
}
if (data_arg->read_write == SMBUS_WRITE) {
copy_from_user(&temp,data_arg->data,datasize);
return smbus_access(client->adapter,client->addr,data_arg->read_write,
data_arg->command,data_arg->size,&temp);
} else {
res = smbus_access(client->adapter,client->addr,data_arg->read_write,
data_arg->command,data_arg->size,&temp);
if (!res)
copy_to_user(data_arg->data,&temp,datasize);
return res;
}
default:
return i2c_control(client,cmd,arg);
}
return 0;
}
int i2cdev_open (struct inode *inode, struct file *file)
{
unsigned int minor = MINOR(inode->i_rdev);
struct i2c_client *client;
if (! i2cdev_clients[minor]) {
#ifdef DEBUG
printk("i2c-dev.o: Trying to open unattached adapter i2c-%d\n",minor);
#endif
return -ENODEV;
}
/* Note that we here allocate a client for later use, but we will *not*
register this client! Yes, this is safe. No, it is not very clean. */
if(! (client = kmalloc(sizeof(struct i2c_client),GFP_KERNEL)))
return -ENOMEM;
memcpy(client,&i2cdev_client_template,sizeof(struct i2c_client));
client->adapter = i2cdev_clients[minor]->adapter;
file->private_data = client;
MOD_INC_USE_COUNT;
#ifdef DEBUG
printk("i2c-dev.o: opened i2c-%d\n",minor);
#endif
return 0;
}
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,31))
static int i2cdev_release (struct inode *inode, struct file *file)
#else
static void i2cdev_release (struct inode *inode, struct file *file)
#endif
{
kfree(file->private_data);
file->private_data=NULL;
#ifdef DEBUG
printk("i2c-dev.o: Closed: i2c-%d\n", MINOR(inode->i_rdev));
#endif
MOD_DEC_USE_COUNT;
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,31))
return 0;
#endif
}
int i2cdev_attach_adapter(struct i2c_adapter *adap)
{
int i,res;
struct i2c_client *client;
if ((i = i2c_adapter_id(adap)) < 0) {
printk("i2c-dev.o: Unknown adapter to attach?!?\n");
return -ENODEV;
}
if (i >= I2CDEV_CLIENTS_MAX) {
printk("i2c-dev.o: Adapter number to attach too large?!? (%d)\n",i);
return -ENODEV;
}
if (i2cdev_clients[i]) {
printk("i2c-dev.o: Adapter to attach already in use?!? (%d)\n",i);
return -EBUSY;
}
if (i2c_is_isa_adapter(adap)) {
#ifdef DEBUG
printk("i2c-dev.o: Can't open ISA adapter!\n");
#endif
return 0;
}
if (! (client = (struct i2c_client *)kmalloc(sizeof(struct i2c_client),
GFP_KERNEL)))
return -ENOMEM;
memcpy(client,&i2cdev_client_template,sizeof(struct i2c_client));
client->adapter = adap;
if ((res = i2c_attach_client(client))) {
printk("i2c-dev.o: Attaching client failed.\n");
kfree(client);
return res;
}
i2cdev_clients[i] = client;
printk("i2cdev.o: Registered '%s' as minor %d\n",adap->name,i);
return 0;
}
int i2cdev_detach_client(struct i2c_client *client)
{
struct i2c_adapter *adap = client->adapter;
int i,res;
if ((i = i2c_adapter_id(adap)) < 0) {
printk("i2c-dev.o: Detaching unknown adapter?!?\n");
return -ENODEV;
}
if (i >= I2CDEV_CLIENTS_MAX) {
printk("i2c-dev.o: Adapter number to detach too large?!? (%d)\n",i);
return -ENODEV;
}
if (!i2cdev_clients[i]) {
printk("i2c-dev.o: Adapter to detach not in use?!? (%d)\n",i);
return -ENODEV;
}
if ((res = i2c_detach_client(client))) {
printk("i2c-dev.o: detaching client %d failed.\n",i);
return res;
}
kfree(i2cdev_clients[i]);
i2cdev_clients[i] = NULL;
#ifdef DEBUG
printk("i2c-dev.o: Adapter unregistered: %s\n",adap->name);
#endif
return 0;
}
static int i2cdev_command(struct i2c_client *client, unsigned int cmd,
void *arg)
{
return -1;
}
static void i2cdev_inc_use(struct i2c_client *client)
{
#ifdef MODULE
MOD_INC_USE_COUNT;
#endif
}
static void i2cdev_dec_use(struct i2c_client *client)
{
#ifdef MODULE
MOD_DEC_USE_COUNT;
#endif
}
int i2cdev_init(void)
{
int res;
printk("i2c-dev.o version %s (%s)\n",LM_VERSION,LM_DATE);
i2cdev_initialized = 0;
if (register_chrdev(I2C_MAJOR,"i2c",&i2cdev_fops)) {
printk("i2c-dev.o: unable to get major %d for i2c bus\n",I2C_MAJOR);
return -EIO;
}
i2cdev_initialized ++;
if ((res = i2c_add_driver(&i2cdev_driver))) {
printk("i2c-dev.o: Driver registration failed, module not inserted.\n");
i2cdev_cleanup();
return res;
}
i2cdev_initialized ++;
return 0;
}
int i2cdev_cleanup(void)
{
int res;
if (i2cdev_initialized >= 2) {
if ((res = i2c_del_driver(&i2cdev_driver))) {
printk("i2c-dev.o: Driver deregistration failed, "
"module not removed.\n");
return res;
}
i2cdev_initialized ++;
}
if (i2cdev_initialized >= 1) {
if ((res = unregister_chrdev(I2C_MAJOR,"i2c"))) {
printk("i2c-dev.o: unable to release major %d for i2c bus\n",I2C_MAJOR);
return res;
}
i2cdev_initialized --;
}
return 0;
}
#ifdef MODULE
MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and Simon G. Vogl <simon@tk.uni-linz.ac.at>");
MODULE_DESCRIPTION("I2C /dev entries driver");
int init_module(void)
{
return i2cdev_init();
}
int cleanup_module(void)
{
return i2cdev_cleanup();
}
#endif /* def MODULE */
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