/*
* w1_therm.c
*
* Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the therms 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <asm/types.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/sched.h>
#include <linux/device.h>
#include <linux/types.h>
#include <linux/delay.h>
#include "../w1.h"
#include "../w1_int.h"
#include "../w1_family.h"
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, temperature family.");
/* Allow the strong pullup to be disabled, but default to enabled.
* If it was disabled a parasite powered device might not get the require
* current to do a temperature conversion. If it is enabled parasite powered
* devices have a better chance of getting the current required.
*/
static int w1_strong_pullup = 1;
module_param_named(strong_pullup, w1_strong_pullup, int, 0);
static u8 bad_roms[][9] = {
{0xaa, 0x00, 0x4b, 0x46, 0xff, 0xff, 0x0c, 0x10, 0x87},
{}
};
static ssize_t w1_therm_read_bin(struct kobject *, struct bin_attribute *,
char *, loff_t, size_t);
static struct bin_attribute w1_therm_bin_attr = {
.attr = {
.name = "w1_slave",
.mode = S_IRUGO,
},
.size = W1_SLAVE_DATA_SIZE,
.read = w1_therm_read_bin,
};
static int w1_therm_add_slave(struct w1_slave *sl)
{
return sysfs_create_bin_file(&sl->dev.kobj, &w1_therm_bin_attr);
}
static void w1_therm_remove_slave(struct w1_slave *sl)
{
sysfs_remove_bin_file(&sl->dev.kobj, &w1_therm_bin_attr);
}
static struct w1_family_ops w1_therm_fops = {
.add_slave = w1_therm_add_slave,
.remove_slave = w1_therm_remove_slave,
};
static struct w1_family w1_therm_family_DS18S20 = {
.fid = W1_THERM_DS18S20,
.fops = &w1_therm_fops,
};
static struct w1_family w1_therm_family_DS18B20 = {
.fid = W1_THERM_DS18B20,
.fops = &w1_therm_fops,
};
static struct w1_family w1_therm_family_DS1822 = {
.fid = W1_THERM_DS1822,
.fops = &w1_therm_fops,
};
struct w1_therm_family_converter
{
u8 broken;
u16 reserved;
struct w1_family *f;
int (*convert)(u8 rom[9]);
};
/* The return value is millidegrees Centigrade. */
static inline int w1_DS18B20_convert_temp(u8 rom[9]);
static inline int w1_DS18S20_convert_temp(u8 rom[9]);
static struct w1_therm_family_converter w1_therm_families[] = {
{
.f = &w1_therm_family_DS18S20,
.convert = w1_DS18S20_convert_temp
},
{
.f = &w1_therm_family_DS1822,
.convert = w1_DS18B20_convert_temp
},
{
.f = &w1_therm_family_DS18B20,
.convert = w1_DS18B20_convert_temp
},
};
static inline int w1_DS18B20_convert_temp(u8 rom[9])
{
s16 t = (rom[1] << 8) | rom[0];
t = t*1000/16;
return t;
}
static inline int w1_DS18S20_convert_temp(u8 rom[9])
{
int t, h;
if (!rom[7])
return 0;
if (rom[1] == 0)
t = ((s32)rom[0] >> 1)*1000;
else
t = 1000*(-1*(s32)(0x100-rom[0]) >> 1);
t -= 250;
h = 1000*((s32)rom[7] - (s32)rom[6]);
h /= (s32)rom[7];
t += h;
return t;
}
static inline int w1_convert_temp(u8 rom[9], u8 fid)
{
int i;
for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i)
if (w1_therm_families[i].f->fid == fid)
return w1_therm_families[i].convert(rom);
return 0;
}
static int w1_therm_check_rom(u8 rom[9])
{
int i;
for (i=0; i<sizeof(bad_roms)/9; ++i)
if (!memcmp(bad_roms[i], rom, 9))
return 1;
return 0;
}
static ssize_t w1_therm_read_bin(struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t off, size_t count)
{
struct w1_slave *sl = kobj_to_w1_slave(kobj);
struct w1_master *dev = sl->master;
u8 rom[9], crc, verdict;
int i, max_trying = 10;
mutex_lock(&sl->master->mutex);
if (off > W1_SLAVE_DATA_SIZE) {
count = 0;
goto out;
}
if (off + count > W1_SLAVE_DATA_SIZE) {
count = 0;
goto out;
}
memset(buf, 0, count);
memset(rom, 0, sizeof(rom));
count = 0;
verdict = 0;
crc = 0;
while (max_trying--) {
if (!w1_reset_select_slave(sl)) {
int count = 0;
unsigned int tm = 750;
/* 750ms strong pullup (or delay) after the convert */
if (w1_strong_pullup)
w1_next_pullup(dev, tm);
w1_write_8(dev, W1_CONVERT_TEMP);
if (!w1_strong_pullup)
msleep(tm);
if (!w1_reset_select_slave(sl)) {
w1_write_8(dev, W1_READ_SCRATCHPAD);
if ((count = w1_read_block(dev, rom, 9)) != 9) {
dev_warn(&dev->dev, "w1_read_block() returned %d instead of 9.\n", count);
}
crc = w1_calc_crc8(rom, 8);
if (rom[8] == crc)
verdict = 1;
}
}
if (!w1_therm_check_rom(rom))
break;
}
for (i = 0; i < 9; ++i)
count += sprintf(buf + count, "%02x ", rom[i]);
count += sprintf(buf + count, ": crc=%02x %s\n",
crc, (verdict) ? "YES" : "NO");
if (verdict)
memcpy(sl->rom, rom, sizeof(sl->rom));
else
dev_warn(&dev->dev, "18S20 doesn't respond to CONVERT_TEMP.\n");
for (i = 0; i < 9; ++i)
count += sprintf(buf + count, "%02x ", sl->rom[i]);
count += sprintf(buf + count, "t=%d\n", w1_convert_temp(rom, sl->family->fid));
out:
mutex_unlock(&dev->mutex);
return count;
}
static int __init w1_therm_init(void)
{
int err, i;
for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i) {
err = w1_register_family(w1_therm_families[i].f);
if (err)
w1_therm_families[i].broken = 1;
}
return 0;
}
static void __exit w1_therm_fini(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i)
if (!w1_therm_families[i].broken)
w1_unregister_family(w1_therm_families[i].f);
}
module_init(w1_therm_init);
module_exit(w1_therm_fini);
