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lm-sensors/kernel/chips/eeprom.c
T
Kyosti Malkki 1cfe63804a (Kyösti) Cleanups 
Copy sysctl enums to chip drivers from sensors.h for now,
   as seen in drivers included in 2.5 tree. File no longer included
   from kernel side.

   Apply i2c-proc change in CVS tagged -km2.

   Partial clean and sort of includes everywhere.

   Add i2c-dev.h, as a partial copy from i2c.
   Add to sensors.h from i2c-proc.h to compile things.
   Remove i2c-isa.h.

   Reflect header file changes to lib/ and prog/.


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1705 7894878c-1315-0410-8ee3-d5d059ff63e0
2003-01-21 20:01:27 +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/slab.h>
#include <linux/i2c.h>
#include <linux/i2c-proc.h>
#include <linux/init.h>
#include "version.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);
#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,
};
/* -- SENSORS SYSCTL START -- */
#define EEPROM_SYSCTL1 1000
#define EEPROM_SYSCTL2 1001
#define EEPROM_SYSCTL3 1002
#define EEPROM_SYSCTL4 1003
#define EEPROM_SYSCTL5 1004
#define EEPROM_SYSCTL6 1005
#define EEPROM_SYSCTL7 1006
#define EEPROM_SYSCTL8 1007
#define EEPROM_SYSCTL9 1008
#define EEPROM_SYSCTL10 1009
#define EEPROM_SYSCTL11 1010
#define EEPROM_SYSCTL12 1011
#define EEPROM_SYSCTL13 1012
#define EEPROM_SYSCTL14 1013
#define EEPROM_SYSCTL15 1014
#define EEPROM_SYSCTL16 1015
/* -- SENSORS SYSCTL END -- */
/* 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)) < 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;
}
#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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