hwmon: (lm90) Define status bits

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.

[JD: Adjusted to include all the new MAX6696 status flags.]

Signed-off-by: Wei Ni <wni@nvidia.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 61 insertions, 27 deletions

diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index 14e36c114d61..5e414ca80a78 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -179,6 +179,23 @@ 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_ROPEN       (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_R2THRM  (1 << 1) /* remote2 THERM limit tripped */
+#define MAX6696_STATUS2_R2OPEN  (1 << 2) /* remote2 is an open circuit */
+#define MAX6696_STATUS2_R2LOW   (1 << 3) /* remote2 low temp limit tripped */
+#define MAX6696_STATUS2_R2HIGH  (1 << 4) /* remote2 high temp limit tripped */
+#define MAX6696_STATUS2_ROT2    (1 << 5) /* remote emergency limit tripped */
+#define MAX6696_STATUS2_R2OT2   (1 << 6) /* remote2 emergency limit tripped */
+#define MAX6696_STATUS2_LOT2    (1 << 7) /* local emergency limit tripped */
+
 /*
  * Driver data (common to all clients)
  */
@@ -1391,6 +1408,43 @@ 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, u16 *status)
+{
+        struct lm90_data *data = i2c_get_clientdata(client);
+        u8 st, st2 = 0;
+
+        lm90_read_reg(client, LM90_REG_R_STATUS, &st);
+
+        if (data->kind == max6696)
+                lm90_read_reg(client, MAX6696_REG_R_STATUS2, &st2);
+
+        *status = st | (st2 << 8);
+
+        if ((st & 0x7f) == 0 && (st2 & 0xfe) == 0)
+                return false;
+
+        if ((st & (LM90_STATUS_LLOW | LM90_STATUS_LHIGH | LM90_STATUS_LTHRM)) ||
+            (st2 & MAX6696_STATUS2_LOT2))
+                dev_warn(&client->dev,
+                         "temp%d out of range, please check!\n", 1);
+        if ((st & (LM90_STATUS_RLOW | LM90_STATUS_RHIGH | LM90_STATUS_RTHRM)) ||
+            (st2 & MAX6696_STATUS2_ROT2))
+                dev_warn(&client->dev,
+                         "temp%d out of range, please check!\n", 2);
+        if (st & LM90_STATUS_ROPEN)
+                dev_warn(&client->dev,
+                         "temp%d diode open, please check!\n", 2);
+        if (st2 & (MAX6696_STATUS2_R2LOW | MAX6696_STATUS2_R2HIGH |
+                   MAX6696_STATUS2_R2THRM | MAX6696_STATUS2_R2OT2))
+                dev_warn(&client->dev,
+                         "temp%d out of range, please check!\n", 3);
+        if (st2 & MAX6696_STATUS2_R2OPEN)
+                dev_warn(&client->dev,
+                         "temp%d diode open, please check!\n", 3);
+
+        return true;
+}
+
 static int lm90_probe(struct i2c_client *client,
                       const struct i2c_device_id *id)
 {
@@ -1489,46 +1543,26 @@ 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) || (alarms2 & 0x80))
-                        dev_warn(&client->dev,
-                                 "temp%d out of range, please check!\n", 1);
-                if ((alarms & 0x1a) || (alarms2 & 0x20))
-                        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 & 0x5a)
-                        dev_warn(&client->dev,
-                                 "temp%d out of range, please check!\n", 3);
-                if (alarms2 & 0x04)
-                        dev_warn(&client->dev,
-                                 "temp%d diode open, please check!\n", 3);
+        u16 alarms;
 
+        if (lm90_is_tripped(client, &alarms)) {
                 /*
                  * 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);
+
                 if ((data->flags & LM90_HAVE_BROKEN_ALERT)
                  && (alarms & data->alert_alarms)) {
+                        u8 config;
                         dev_dbg(&client->dev, "Disabling ALERT#\n");
                         lm90_read_reg(client, LM90_REG_R_CONFIG1, &config);
                         i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
                                                   config | 0x80);
                 }
+        } else {
+                dev_info(&client->dev, "Everything OK\n");
         }
 }