Add bit defines for the status register. And add a function
lm90_is_tripped() which will read status register and return
tripped or not, then lm90_alert can call it directly, and in the
future the IRQ thread also can use it.
Signed-off-by: Wei Ni <wni@xxxxxxxxxx>
---
drivers/hwmon/lm90.c | 75 +++++++++++++++++++++++++++++++++-----------------
1 file changed, 50 insertions(+), 25 deletions(-)
diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index cdff742..1da2eff 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -179,6 +179,18 @@ enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
#define LM90_HAVE_TEMP3 (1 << 6) /* 3rd temperature sensor */
#define LM90_HAVE_BROKEN_ALERT (1 << 7) /* Broken alert */
+/* LM90 status */
+#define LM90_STATUS_LTHRM (1 << 0) /* local THERM limit tripped */
+#define LM90_STATUS_RTHRM (1 << 1) /* remote THERM limit tripped */
+#define LM90_STATUS_OPEN (1 << 2) /* remote is an open circuit */
+#define LM90_STATUS_RLOW (1 << 3) /* remote low temp limit tripped */
+#define LM90_STATUS_RHIGH (1 << 4) /* remote high temp limit tripped */
+#define LM90_STATUS_LLOW (1 << 5) /* local low temp limit tripped */
+#define LM90_STATUS_LHIGH (1 << 6) /* local high temp limit tripped */
+
+#define MAX6696_STATUS2_RLOW (1 << 3) /* remote2 low temp limit tripped */
+#define MAX6696_STATUS2_RHIGH (1 << 4) /* remote2 high temp limit tripped */
+
/*
* Driver data (common to all clients)
*/
@@ -1391,6 +1403,36 @@ static void lm90_init_client(struct i2c_client *client)
i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config);
}
+static bool lm90_is_tripped(struct i2c_client *client)
+{
+ struct lm90_data *data = i2c_get_clientdata(client);
+ u8 status, status2 = 0;
+
+ lm90_read_reg(client, LM90_REG_R_STATUS, &status);
+
+ if (data->kind == max6696)
+ lm90_read_reg(client, MAX6696_REG_R_STATUS2, &status2);
+
+ if ((status & 0x7f) == 0 && (status2 & 0xfe) == 0)
+ return false;
+
+ if (status & (LM90_STATUS_LLOW | LM90_STATUS_LHIGH | LM90_STATUS_LTHRM))
+ dev_warn(&client->dev,
+ "temp%d out of range, please check!\n", 1);
+ if (status & (LM90_STATUS_RLOW | LM90_STATUS_RHIGH | LM90_STATUS_RTHRM))
+ dev_warn(&client->dev,
+ "temp%d out of range, please check!\n", 2);
+ if (status & LM90_STATUS_OPEN)
+ dev_warn(&client->dev,
+ "temp%d diode open, please check!\n", 2);
+
+ if (status2 & (MAX6696_STATUS2_RLOW | MAX6696_STATUS2_RHIGH))
+ dev_warn(&client->dev,
+ "temp%d out of range, please check!\n", 3);
+
+ return true;
+}
+
static int lm90_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -1489,36 +1531,17 @@ static int lm90_remove(struct i2c_client *client)
static void lm90_alert(struct i2c_client *client, unsigned int flag)
{
- struct lm90_data *data = i2c_get_clientdata(client);
- u8 config, alarms, alarms2 = 0;
-
- lm90_read_reg(client, LM90_REG_R_STATUS, &alarms);
-
- if (data->kind == max6696)
- lm90_read_reg(client, MAX6696_REG_R_STATUS2, &alarms2);
-
- if ((alarms & 0x7f) == 0 && (alarms2 & 0xfe) == 0) {
- dev_info(&client->dev, "Everything OK\n");
- } else {
- if (alarms & 0x61)
- dev_warn(&client->dev,
- "temp%d out of range, please check!\n", 1);
- if (alarms & 0x1a)
- dev_warn(&client->dev,
- "temp%d out of range, please check!\n", 2);
- if (alarms & 0x04)
- dev_warn(&client->dev,
- "temp%d diode open, please check!\n", 2);
-
- if (alarms2 & 0x18)
- dev_warn(&client->dev,
- "temp%d out of range, please check!\n", 3);
-
+ if (lm90_is_tripped(client)) {
/*
* Disable ALERT# output, because these chips don't implement
* SMBus alert correctly; they should only hold the alert line
* low briefly.
*/
+ struct lm90_data *data = i2c_get_clientdata(client);
+ u8 config, alarms;
+
+ lm90_read_reg(client, LM90_REG_R_STATUS, &alarms);
+
if ((data->flags & LM90_HAVE_BROKEN_ALERT)
&& (alarms & data->alert_alarms)) {
dev_dbg(&client->dev, "Disabling ALERT#\n");
@@ -1526,6 +1549,8 @@ static void lm90_alert(struct i2c_client *client, unsigned int flag)
i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
config | 0x80);
}
+ } else {
+ dev_info(&client->dev, "Everything OK\n");
}
}
--
1.7.9.5
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