hwmon: (lm90) Support the extra resolution bits of MAX6657
The Maxim MAX6657, MAX6658 and MAX6659 have extra resolution bits for
the local temperature measurement. Let the lm90 driver read them and
export them to user-space.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Martyn Welch <martyn.welch@gefanuc.com>
diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index 73a1c62..16b99e0 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -149,6 +149,10 @@
#define LM90_REG_R_TCRIT_HYST 0x21
#define LM90_REG_W_TCRIT_HYST 0x21
+/* MAX6657-specific registers */
+
+#define MAX6657_REG_R_LOCAL_TEMPL 0x11
+
/*
* Conversions and various macros
* For local temperatures and limits, critical limits and the hysteresis
@@ -239,15 +243,15 @@
int kind;
/* registers values */
- s8 temp8[5]; /* 0: local input
- 1: local low limit
- 2: local high limit
- 3: local critical limit
- 4: remote critical limit */
- s16 temp11[4]; /* 0: remote input
+ s8 temp8[4]; /* 0: local low limit
+ 1: local high limit
+ 2: local critical limit
+ 3: remote critical limit */
+ s16 temp11[5]; /* 0: remote input
1: remote low limit
2: remote high limit
- 3: remote offset (except max6657) */
+ 3: remote offset (except max6657)
+ 4: local input */
u8 temp_hyst;
u8 alarms; /* bitvector */
};
@@ -285,7 +289,7 @@
data->temp8[nr] = TEMP1_TO_REG_ADT7461(val);
else
data->temp8[nr] = TEMP1_TO_REG(val);
- i2c_smbus_write_byte_data(client, reg[nr - 1], data->temp8[nr]);
+ i2c_smbus_write_byte_data(client, reg[nr], data->temp8[nr]);
mutex_unlock(&data->update_lock);
return count;
}
@@ -347,7 +351,7 @@
long hyst;
mutex_lock(&data->update_lock);
- hyst = TEMP1_FROM_REG(data->temp8[3]) - val;
+ hyst = TEMP1_FROM_REG(data->temp8[2]) - val;
i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST,
HYST_TO_REG(hyst));
mutex_unlock(&data->update_lock);
@@ -371,23 +375,23 @@
return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
}
-static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp8, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp11, NULL, 4);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp8,
- set_temp8, 1);
+ set_temp8, 0);
static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11,
set_temp11, 1);
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8,
- set_temp8, 2);
+ set_temp8, 1);
static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11,
set_temp11, 2);
static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp8,
- set_temp8, 3);
+ set_temp8, 2);
static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp8,
- set_temp8, 4);
+ set_temp8, 3);
static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temphyst,
- set_temphyst, 3);
-static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL, 4);
+ set_temphyst, 2);
+static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL, 3);
static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_temp11,
set_temp11, 3);
@@ -779,13 +783,21 @@
u8 h, l;
dev_dbg(&client->dev, "Updating lm90 data.\n");
- lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP, &data->temp8[0]);
- lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, &data->temp8[1]);
- lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, &data->temp8[2]);
- lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, &data->temp8[3]);
- lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[4]);
+ lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, &data->temp8[0]);
+ lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, &data->temp8[1]);
+ lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, &data->temp8[2]);
+ lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[3]);
lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst);
+ if (data->kind == max6657) {
+ lm90_read16(client, LM90_REG_R_LOCAL_TEMP,
+ MAX6657_REG_R_LOCAL_TEMPL,
+ &data->temp11[4]);
+ } else {
+ if (lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP,
+ &h) == 0)
+ data->temp11[4] = h << 8;
+ }
lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
LM90_REG_R_REMOTE_TEMPL, &data->temp11[0]);