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[PATCH] w1_therm: support for ds18b20, ds1822 thermal sensors. 

Support for ds18b20, ds1822 thermal sensors.
Based on code from Tiziano M_ller <tm@dev-zero.ch>.
Patch is against 2.6.12-rc2 and should be applied
without problems on top of any later kernels since
w1_therm driver was not changed.

Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Evgeniy Polyakov 2005-04-17 22:58:14 +04:00 committed by Greg Kroah-Hartman
parent 2a5a68b840
commit 718a538f94
2 changed files with 85 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/w1/w1_family.h
View File

@ -27,8 +27,10 @@
#include <asm/atomic.h>
#define W1_FAMILY_DEFAULT 0
#define W1_FAMILY_THERM 0x10
#define W1_FAMILY_SMEM 0x01
#define W1_THERM_DS18S20 0x10
#define W1_THERM_DS1822 0x22
#define W1_THERM_DS18B20 0x28
#define MAXNAMELEN 32

92
drivers/w1/w1_therm.c
View File

@ -53,6 +53,50 @@ static struct w1_family_ops w1_therm_fops = {
.rvalname = "temp1_input",
};
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 fid;
u8 broken;
u16 reserved;
struct w1_family *f;
int (*convert)(u8 rom[9]);
};
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[] = {
{
.fid = W1_THERM_DS18S20,
.f = &w1_therm_family_DS18S20,
.convert = w1_DS18S20_convert_temp
},
{
.fid = W1_THERM_DS1822,
.f = &w1_therm_family_DS1822,
.convert = w1_DS18B20_convert_temp
},
{
.fid = W1_THERM_DS18B20,
.f = &w1_therm_family_DS18B20,
.convert = w1_DS18B20_convert_temp
},
};
static ssize_t w1_therm_read_name(struct device *dev, struct device_attribute *attr, char *buf)
{
struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
@ -60,9 +104,19 @@ static ssize_t w1_therm_read_name(struct device *dev, struct device_attribute *a
return sprintf(buf, "%s\n", sl->name);
}
static inline int w1_convert_temp(u8 rom[9])
static inline int w1_DS18B20_convert_temp(u8 rom[9])
{
int t = (rom[1] << 8) | rom[0];
t /= 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;
@ -77,11 +131,22 @@ static inline int w1_convert_temp(u8 rom[9])
return t;
}
static inline int w1_convert_temp(u8 rom[9], u8 fid)
{
int i;
for (i=0; i<sizeof(w1_therm_families)/sizeof(w1_therm_families[0]); ++i)
if (w1_therm_families[i].fid == fid)
return w1_therm_families[i].convert(rom);
return 0;
}
static ssize_t w1_therm_read_temp(struct device *dev, struct device_attribute *attr, char *buf)
{
struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
return sprintf(buf, "%d\n", w1_convert_temp(sl->rom));
return sprintf(buf, "%d\n", w1_convert_temp(sl->rom, sl->family->fid));
}
static int w1_therm_check_rom(u8 rom[9])
@ -176,7 +241,7 @@ static ssize_t w1_therm_read_bin(struct kobject *kobj, char *buf, loff_t off, si
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));
count += sprintf(buf + count, "t=%d\n", w1_convert_temp(rom, sl->family->fid));
out:
up(&dev->mutex);
out_dec:
@ -186,19 +251,26 @@ out_dec:
return count;
}
static struct w1_family w1_therm_family = {
.fid = W1_FAMILY_THERM,
.fops = &w1_therm_fops,
};
static int __init w1_therm_init(void)
{
return w1_register_family(&w1_therm_family);
int err, i;
for (i=0; i<sizeof(w1_therm_families)/sizeof(w1_therm_families[0]); ++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)
{
w1_unregister_family(&w1_therm_family);
int i;
for (i=0; i<sizeof(w1_therm_families)/sizeof(w1_therm_families[0]); ++i)
if (!w1_therm_families[i].broken)
w1_unregister_family(w1_therm_families[i].f);
}
module_init(w1_therm_init);