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Diffstat (limited to 'drivers/w1/w1_therm.c')
-rw-r--r--drivers/w1/w1_therm.c104
1 files changed, 81 insertions, 23 deletions
diff --git a/drivers/w1/w1_therm.c b/drivers/w1/w1_therm.c
index 0b1817890503..165526c9360a 100644
--- a/drivers/w1/w1_therm.c
+++ b/drivers/w1/w1_therm.c
@@ -1,8 +1,8 @@
/*
- * w1_therm.c
+ * 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
@@ -38,31 +38,78 @@ MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, temperature family.");
static u8 bad_roms[][9] = {
- {0xaa, 0x00, 0x4b, 0x46, 0xff, 0xff, 0x0c, 0x10, 0x87},
+ {0xaa, 0x00, 0x4b, 0x46, 0xff, 0xff, 0x0c, 0x10, 0x87},
{}
};
-static ssize_t w1_therm_read_name(struct device *, char *);
-static ssize_t w1_therm_read_temp(struct device *, char *);
+static ssize_t w1_therm_read_name(struct device *, struct device_attribute *attr, char *);
static ssize_t w1_therm_read_bin(struct kobject *, char *, loff_t, size_t);
static struct w1_family_ops w1_therm_fops = {
.rname = &w1_therm_read_name,
.rbin = &w1_therm_read_bin,
- .rval = &w1_therm_read_temp,
- .rvalname = "temp1_input",
};
-static ssize_t w1_therm_read_name(struct device *dev, char *buf)
+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]);
+};
+
+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 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);
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 +124,15 @@ static inline int w1_convert_temp(u8 rom[9])
return t;
}
-static ssize_t w1_therm_read_temp(struct device *dev, char *buf)
+static inline int w1_convert_temp(u8 rom[9], u8 fid)
{
- struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
+ int i;
+
+ for (i=0; i<sizeof(w1_therm_families)/sizeof(w1_therm_families[0]); ++i)
+ if (w1_therm_families[i].f->fid == fid)
+ return w1_therm_families[i].convert(rom);
- return sprintf(buf, "%d\n", w1_convert_temp(sl->rom));
+ return 0;
}
static int w1_therm_check_rom(u8 rom[9])
@@ -98,7 +149,7 @@ static int w1_therm_check_rom(u8 rom[9])
static ssize_t w1_therm_read_bin(struct kobject *kobj, char *buf, loff_t off, size_t count)
{
struct w1_slave *sl = container_of(container_of(kobj, struct device, kobj),
- struct w1_slave, dev);
+ struct w1_slave, dev);
struct w1_master *dev = sl->master;
u8 rom[9], crc, verdict;
int i, max_trying = 10;
@@ -133,7 +184,7 @@ static ssize_t w1_therm_read_bin(struct kobject *kobj, char *buf, loff_t off, si
unsigned int tm = 750;
memcpy(&match[1], (u64 *) & sl->reg_num, 8);
-
+
w1_write_block(dev, match, 9);
w1_write_8(dev, W1_CONVERT_TEMP);
@@ -146,7 +197,7 @@ static ssize_t w1_therm_read_bin(struct kobject *kobj, char *buf, loff_t off, si
if (!w1_reset_bus (dev)) {
w1_write_block(dev, match, 9);
-
+
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);
@@ -176,7 +227,7 @@ 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 +237,26 @@ 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);