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lm-sensors/kernel/chips/eeprom.c
T
Kyosti Malkki 39391ba6ea (Kyösti) some cleanups for 2.4+ 
Module refcounting using .owner, removing of inc/dec_use.
   These require (yet unreleased) i2c 2.8.0+.

   Named initializers everywhere. Unified namespace.

   Cleanup for 2.5, remove EXPORT_NO_SYMBOLS, declare everything
   static. Apply initcalls.

   PCI device registration changes for busses started, replicating
   from i2c-amd*. While everything does compile, nothing really
   works. Well, maybe i2c-amd* ported back from 2.5 tree.

   After updating your work directory, run
    > cvs diff -u -r LAST-PRE-2-8-I2C > lm-2.8-patches-1

   BEWARE: I have not even insmoded any of these yet.

   To compile, you need i2c from cvs too.
   For 2.4 kernel :
    > cvs co -r lk2-4 i2c

   For 2.5 kernel :
    > cvs co i2c


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1698 7894878c-1315-0410-8ee3-d5d059ff63e0
2003-01-17 01:19:52 +00:00

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/*
eeprom.c - Part of lm_sensors, Linux kernel modules for hardware
monitoring
Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
Philip Edelbrock <phil@netroedge.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
(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.
*/
#include <linux/module.h>
#include <linux/version.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include "sensors.h"
#include "version.h"
#include <linux/init.h>
MODULE_LICENSE("GPL");
/* Addresses to scan */
static unsigned short normal_i2c[] = { SENSORS_I2C_END };
static unsigned short normal_i2c_range[] = { 0x50, 0x57, SENSORS_I2C_END };
static unsigned int normal_isa[] = { SENSORS_ISA_END };
static unsigned int normal_isa_range[] = { SENSORS_ISA_END };
/* Insmod parameters */
SENSORS_INSMOD_1(eeprom);
static int checksum = 0;
MODULE_PARM(checksum, "i");
MODULE_PARM_DESC(checksum,
"Only accept eeproms whose checksum is correct");
/* Many constants specified below */
/* EEPROM registers */
#define EEPROM_REG_CHECKSUM 0x3f
/* EEPROM memory types: */
#define ONE_K 1
#define TWO_K 2
#define FOUR_K 3
#define EIGHT_K 4
#define SIXTEEN_K 5
/* Conversions */
/* Size of EEPROM in bytes */
#define EEPROM_SIZE 256
/* Each client has this additional data */
struct eeprom_data {
int sysctl_id;
struct semaphore update_lock;
char valid; /* !=0 if following fields are valid */
unsigned long last_updated; /* In jiffies */
u8 data[EEPROM_SIZE]; /* Register values */
#if 0
int memtype;
#endif
};
static int eeprom_attach_adapter(struct i2c_adapter *adapter);
static int eeprom_detect(struct i2c_adapter *adapter, int address,
unsigned short flags, int kind);
static int eeprom_detach_client(struct i2c_client *client);
static int eeprom_command(struct i2c_client *client, unsigned int cmd,
void *arg);
#if 0
static int eeprom_write_value(struct i2c_client *client, u8 reg,
u8 value);
#endif
static void eeprom_contents(struct i2c_client *client, int operation,
int ctl_name, int *nrels_mag, long *results);
static void eeprom_update_client(struct i2c_client *client);
/* This is the driver that will be inserted */
static struct i2c_driver eeprom_driver = {
.owner = THIS_MODULE,
.name = "EEPROM READER",
.id = I2C_DRIVERID_EEPROM,
.flags = I2C_DF_NOTIFY,
.attach_adapter = eeprom_attach_adapter,
.detach_client = eeprom_detach_client,
.command = eeprom_command,
};
/* These files are created for each detected EEPROM. This is just a template;
though at first sight, you might think we could use a statically
allocated list, we need some way to get back to the parent - which
is done through one of the 'extra' fields which are initialized
when a new copy is allocated. */
static ctl_table eeprom_dir_table_template[] = {
{EEPROM_SYSCTL1, "00", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &eeprom_contents},
{EEPROM_SYSCTL2, "10", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &eeprom_contents},
{EEPROM_SYSCTL3, "20", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &eeprom_contents},
{EEPROM_SYSCTL4, "30", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &eeprom_contents},
{EEPROM_SYSCTL5, "40", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &eeprom_contents},
{EEPROM_SYSCTL6, "50", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &eeprom_contents},
{EEPROM_SYSCTL7, "60", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &eeprom_contents},
{EEPROM_SYSCTL8, "70", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &eeprom_contents},
{EEPROM_SYSCTL9, "80", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &eeprom_contents},
{EEPROM_SYSCTL10, "90", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &eeprom_contents},
{EEPROM_SYSCTL11, "a0", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &eeprom_contents},
{EEPROM_SYSCTL12, "b0", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &eeprom_contents},
{EEPROM_SYSCTL13, "c0", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &eeprom_contents},
{EEPROM_SYSCTL14, "d0", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &eeprom_contents},
{EEPROM_SYSCTL15, "e0", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &eeprom_contents},
{EEPROM_SYSCTL16, "f0", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &eeprom_contents},
{0}
};
static int eeprom_id = 0;
static int eeprom_attach_adapter(struct i2c_adapter *adapter)
{
return i2c_detect(adapter, &addr_data, eeprom_detect);
}
/* This function is called by i2c_detect */
int eeprom_detect(struct i2c_adapter *adapter, int address,
unsigned short flags, int kind)
{
int i, cs;
struct i2c_client *new_client;
struct eeprom_data *data;
int err = 0;
const char *type_name, *client_name;
/* Make sure we aren't probing the ISA bus!! This is just a safety check
at this moment; i2c_detect really won't call us. */
#ifdef DEBUG
if (i2c_is_isa_adapter(adapter)) {
printk
("eeprom.o: eeprom_detect called for an ISA bus adapter?!?\n");
return 0;
}
#endif
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
goto ERROR0;
/* OK. For now, we presume we have a valid client. We now create the
client structure, even though we cannot fill it completely yet.
But it allows us to access eeprom_{read,write}_value. */
if (!(new_client = kmalloc(sizeof(struct i2c_client) +
sizeof(struct eeprom_data),
GFP_KERNEL))) {
err = -ENOMEM;
goto ERROR0;
}
data = (struct eeprom_data *) (new_client + 1);
memset(data, 0xff, EEPROM_SIZE);
new_client->addr = address;
new_client->data = data;
new_client->adapter = adapter;
new_client->driver = &eeprom_driver;
new_client->flags = 0;
/* Now, we do the remaining detection. It is not there, unless you force
the checksum to work out. */
if (checksum) {
/* prevent 24RF08 corruption */
i2c_smbus_write_quick(new_client, 0);
cs = 0;
for (i = 0; i <= 0x3e; i++)
cs += i2c_smbus_read_byte_data(new_client, i);
cs &= 0xff;
if (i2c_smbus_read_byte_data
(new_client, EEPROM_REG_CHECKSUM) != cs)
goto ERROR1;
}
/* Determine the chip type - only one kind supported! */
if (kind <= 0)
kind = eeprom;
if (kind == eeprom) {
type_name = "eeprom";
client_name = "EEPROM chip";
} else {
#ifdef DEBUG
printk("eeprom.o: Internal error: unknown kind (%d)?!?",
kind);
#endif
goto ERROR1;
}
/* Fill in the remaining client fields and put it into the global list */
strcpy(new_client->name, client_name);
new_client->id = eeprom_id++;
data->valid = 0;
init_MUTEX(&data->update_lock);
/* Tell the I2C layer a new client has arrived */
if ((err = i2c_attach_client(new_client)))
goto ERROR3;
/* Register a new directory entry with module sensors */
if ((i = i2c_register_entry(new_client, type_name,
eeprom_dir_table_template,
THIS_MODULE)) < 0) {
err = i;
goto ERROR4;
}
data->sysctl_id = i;
return 0;
/* OK, this is not exactly good programming practice, usually. But it is
very code-efficient in this case. */
ERROR4:
i2c_detach_client(new_client);
ERROR3:
ERROR1:
kfree(new_client);
ERROR0:
return err;
}
static int eeprom_detach_client(struct i2c_client *client)
{
int err;
i2c_deregister_entry(((struct eeprom_data *) (client->data))->
sysctl_id);
if ((err = i2c_detach_client(client))) {
printk
("eeprom.o: Client deregistration failed, client not detached.\n");
return err;
}
kfree(client);
return 0;
}
/* No commands defined yet */
static int eeprom_command(struct i2c_client *client, unsigned int cmd, void *arg)
{
return 0;
}
#if 0
/* No writes yet (PAE) */
static int eeprom_write_value(struct i2c_client *client, u8 reg, u8 value)
{
return i2c_smbus_write_byte_data(client, reg, value);
}
#endif
static void eeprom_update_client(struct i2c_client *client)
{
struct eeprom_data *data = client->data;
int i, j;
down(&data->update_lock);
if ((jiffies - data->last_updated > 300 * HZ) |
(jiffies < data->last_updated) || !data->valid) {
#ifdef DEBUG
printk("Starting eeprom update\n");
#endif
if (i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_I2C_BLOCK))
{
for (i=0; i<EEPROM_SIZE; i+=I2C_SMBUS_I2C_BLOCK_MAX)
if (i2c_smbus_read_i2c_block_data(client,
i, data->data + i)
!= I2C_SMBUS_I2C_BLOCK_MAX)
goto DONE;
} else {
if (i2c_smbus_write_byte(client, 0)) {
#ifdef DEBUG
printk("eeprom read start has failed!\n");
#endif
goto DONE;
}
for (i = 0; i < EEPROM_SIZE; i++) {
j = i2c_smbus_read_byte(client);
if (j < 0)
goto DONE;
data->data[i] = (u8) j;
}
}
data->last_updated = jiffies;
data->valid = 1;
}
DONE:
up(&data->update_lock);
}
void eeprom_contents(struct i2c_client *client, int operation,
int ctl_name, int *nrels_mag, long *results)
{
int i;
int base = 0;
struct eeprom_data *data = client->data;
switch (ctl_name) {
case EEPROM_SYSCTL2:
base = 16;
break;
case EEPROM_SYSCTL3:
base = 32;
break;
case EEPROM_SYSCTL4:
base = 48;
break;
case EEPROM_SYSCTL5:
base = 64;
break;
case EEPROM_SYSCTL6:
base = 80;
break;
case EEPROM_SYSCTL7:
base = 96;
break;
case EEPROM_SYSCTL8:
base = 112;
break;
case EEPROM_SYSCTL9:
base = 128;
break;
case EEPROM_SYSCTL10:
base = 144;
break;
case EEPROM_SYSCTL11:
base = 160;
break;
case EEPROM_SYSCTL12:
base = 176;
break;
case EEPROM_SYSCTL13:
base = 192;
break;
case EEPROM_SYSCTL14:
base = 208;
break;
case EEPROM_SYSCTL15:
base = 224;
break;
case EEPROM_SYSCTL16:
base = 240;
break;
}
if (operation == SENSORS_PROC_REAL_INFO)
*nrels_mag = 0;
else if (operation == SENSORS_PROC_REAL_READ) {
eeprom_update_client(client);
for (i = 0; i < 16; i++) {
results[i] = data->data[i + base];
}
#ifdef DEBUG
printk("eeprom.o: 0x%X EEPROM Contents (base %d): ",
client->addr, base);
for (i = 0; i < 16; i++) {
printk(" 0x%X", data->data[i + base]);
}
printk(" .\n");
#endif
*nrels_mag = 16;
} else if (operation == SENSORS_PROC_REAL_WRITE) {
/* No writes to the EEPROM (yet, anyway) (PAE) */
printk("eeprom.o: No writes to EEPROMs supported!\n");
}
}
static int __init sm_eeprom_init(void)
{
printk("eeprom.o version %s (%s)\n", LM_VERSION, LM_DATE);
return i2c_add_driver(&eeprom_driver);
}
static void __exit sm_eeprom_exit(void)
{
i2c_del_driver(&eeprom_driver);
}
MODULE_AUTHOR
("Frodo Looijaard <frodol@dds.nl> and Philip Edelbrock <phil@netroedge.com>");
MODULE_DESCRIPTION("EEPROM driver");
module_init(sm_eeprom_init);
module_exit(sm_eeprom_exit);
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