[PATCH] w1_therm: support for ds18b20, ds1822 thermal sensors.
Evgeniy Polyakov [Sun, 17 Apr 2005 18:58:14 +0000 (22:58 +0400)]
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>

drivers/w1/w1_family.h
drivers/w1/w1_therm.c

index 07fa494..2995c6c 100644 (file)
 #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
 
index 70310f7..84e8043 100644 (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);