/*
* lm90.c - Part of lm_sensors, Linux kernel modules for hardware
* monitoring
- * Copyright (C) 2003-2006 Jean Delvare <khali@linux-fr.org>
+ * Copyright (C) 2003-2008 Jean Delvare <khali@linux-fr.org>
*
* Based on the lm83 driver. The LM90 is a sensor chip made by National
* Semiconductor. It reports up to two temperatures (its own plus up to
#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
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 */
};
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;
}
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);
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);
return 0;
}
+static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl, u16 *value)
+{
+ int err;
+ u8 oldh, newh, l;
+
+ /*
+ * There is a trick here. We have to read two registers to have the
+ * sensor temperature, but we have to beware a conversion could occur
+ * inbetween the readings. The datasheet says we should either use
+ * the one-shot conversion register, which we don't want to do
+ * (disables hardware monitoring) or monitor the busy bit, which is
+ * impossible (we can't read the values and monitor that bit at the
+ * exact same time). So the solution used here is to read the high
+ * byte once, then the low byte, then the high byte again. If the new
+ * high byte matches the old one, then we have a valid reading. Else
+ * we have to read the low byte again, and now we believe we have a
+ * correct reading.
+ */
+ if ((err = lm90_read_reg(client, regh, &oldh))
+ || (err = lm90_read_reg(client, regl, &l))
+ || (err = lm90_read_reg(client, regh, &newh)))
+ return err;
+ if (oldh != newh) {
+ err = lm90_read_reg(client, regl, &l);
+ if (err)
+ return err;
+ }
+ *value = (newh << 8) | l;
+
+ return 0;
+}
+
static struct lm90_data *lm90_update_device(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
- u8 oldh, newh, l;
+ 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);
- /*
- * There is a trick here. We have to read two registers to
- * have the remote sensor temperature, but we have to beware
- * a conversion could occur inbetween the readings. The
- * datasheet says we should either use the one-shot
- * conversion register, which we don't want to do (disables
- * hardware monitoring) or monitor the busy bit, which is
- * impossible (we can't read the values and monitor that bit
- * at the exact same time). So the solution used here is to
- * read the high byte once, then the low byte, then the high
- * byte again. If the new high byte matches the old one,
- * then we have a valid reading. Else we have to read the low
- * byte again, and now we believe we have a correct reading.
- */
- if (lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPH, &oldh) == 0
- && lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPL, &l) == 0
- && lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPH, &newh) == 0
- && (newh == oldh
- || lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPL, &l) == 0))
- data->temp11[0] = (newh << 8) | l;
-
- if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &newh) == 0
+ 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]);
+
+ if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h) == 0
&& lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL, &l) == 0)
- data->temp11[1] = (newh << 8) | l;
- if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &newh) == 0
+ data->temp11[1] = (h << 8) | l;
+ if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h) == 0
&& lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL, &l) == 0)
- data->temp11[2] = (newh << 8) | l;
+ data->temp11[2] = (h << 8) | l;
if (data->kind != max6657) {
if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH,
- &newh) == 0
+ &h) == 0
&& lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL,
&l) == 0)
- data->temp11[3] = (newh << 8) | l;
+ data->temp11[3] = (h << 8) | l;
}
lm90_read_reg(client, LM90_REG_R_STATUS, &data->alarms);
projects / linux-2.6-omap-h63xx.git / blobdiff