* variants. The extra address and features of the MAX6659 are not
* supported by this driver.
*
+ * This driver also supports the ADT7461 chip from Analog Devices but
+ * only in its "compatability mode". If an ADT7461 chip is found but
+ * is configured in non-compatible mode (where its temperature
+ * register values are decoded differently) it is ignored by this
+ * driver. Complete datasheet can be obtained from Analog's website
+ * at:
+ * http://products.analog.com/products/info.asp?product=ADT7461
+ *
* Since the LM90 was the first chipset supported by this driver, most
* comments will refer to this chipset, but are actually general and
* concern all supported chipsets, unless mentioned otherwise.
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
+#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/i2c-sensor.h>
* LM86, LM89, LM90, LM99, ADM1032, MAX6657 and MAX6658 have address 0x4c.
* LM89-1, and LM99-1 have address 0x4d.
* MAX6659 can have address 0x4c, 0x4d or 0x4e (unsupported).
+ * ADT7461 always has address 0x4c.
*/
static unsigned short normal_i2c[] = { 0x4c, 0x4d, I2C_CLIENT_END };
* Insmod parameters
*/
-SENSORS_INSMOD_5(lm90, adm1032, lm99, lm86, max6657);
+SENSORS_INSMOD_6(lm90, adm1032, lm99, lm86, max6657, adt7461);
/*
* The LM90 registers
#define HYST_TO_REG(val) ((val) <= 0 ? 0 : (val) >= 30500 ? 31 : \
((val) + 500) / 1000)
+/*
+ * ADT7461 is almost identical to LM90 except that attempts to write
+ * values that are outside the range 0 < temp < 127 are treated as
+ * the boundary value.
+ */
+
+#define TEMP1_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \
+ (val) >= 127000 ? 127 : \
+ ((val) + 500) / 1000)
+#define TEMP2_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \
+ (val) >= 127750 ? 0x7FC0 : \
+ ((val) + 125) / 250 * 64)
+
/*
* Functions declaration
*/
struct semaphore update_lock;
char valid; /* zero until following fields are valid */
unsigned long last_updated; /* in jiffies */
+ int kind;
/* registers values */
s8 temp_input1, temp_low1, temp_high1; /* local */
u8 alarms; /* bitvector */
};
-/*
- * Internal variables
- */
-
-static int lm90_id;
-
/*
* Sysfs stuff
*/
struct i2c_client *client = to_i2c_client(dev); \
struct lm90_data *data = i2c_get_clientdata(client); \
long val = simple_strtol(buf, NULL, 10); \
- data->value = TEMP1_TO_REG(val); \
+ \
+ down(&data->update_lock); \
+ if (data->kind == adt7461) \
+ data->value = TEMP1_TO_REG_ADT7461(val); \
+ else \
+ data->value = TEMP1_TO_REG(val); \
i2c_smbus_write_byte_data(client, reg, data->value); \
+ up(&data->update_lock); \
return count; \
}
#define set_temp2(value, regh, regl) \
struct i2c_client *client = to_i2c_client(dev); \
struct lm90_data *data = i2c_get_clientdata(client); \
long val = simple_strtol(buf, NULL, 10); \
- data->value = TEMP2_TO_REG(val); \
+ \
+ down(&data->update_lock); \
+ if (data->kind == adt7461) \
+ data->value = TEMP2_TO_REG_ADT7461(val); \
+ else \
+ data->value = TEMP2_TO_REG(val); \
i2c_smbus_write_byte_data(client, regh, data->value >> 8); \
i2c_smbus_write_byte_data(client, regl, data->value & 0xff); \
+ up(&data->update_lock); \
return count; \
}
set_temp1(temp_low1, LM90_REG_W_LOCAL_LOW);
{
struct i2c_client *client = to_i2c_client(dev);
struct lm90_data *data = i2c_get_clientdata(client);
- int hyst = TEMP1_FROM_REG(data->temp_crit1) -
- simple_strtol(buf, NULL, 10);
+ long val = simple_strtol(buf, NULL, 10);
+ long hyst;
+
+ down(&data->update_lock);
+ hyst = TEMP1_FROM_REG(data->temp_crit1) - val;
i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST,
HYST_TO_REG(hyst));
+ up(&data->update_lock);
return count;
}
&& (reg_config1 & 0x3F) == 0x00
&& reg_convrate <= 0x0A) {
kind = adm1032;
+ } else
+ if (address == 0x4c
+ && chip_id == 0x51 /* ADT7461 */
+ && (reg_config1 & 0x1F) == 0x00 /* check compat mode */
+ && reg_convrate <= 0x0A) {
+ kind = adt7461;
}
} else
if (man_id == 0x4D) { /* Maxim */
name = "lm86";
} else if (kind == max6657) {
name = "max6657";
+ } else if (kind == adt7461) {
+ name = "adt7461";
}
/* We can fill in the remaining client fields */
strlcpy(new_client->name, name, I2C_NAME_SIZE);
- new_client->id = lm90_id++;
data->valid = 0;
+ data->kind = kind;
init_MUTEX(&data->update_lock);
/* Tell the I2C layer a new client has arrived */
down(&data->update_lock);
- if ((jiffies - data->last_updated > HZ * 2) ||
- (jiffies < data->last_updated) ||
- !data->valid) {
+ if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
u8 oldh, newh;
dev_dbg(&client->dev, "Updating lm90 data.\n");