hwmon: (lm90) Add explicit support for max6659

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

2 files changed, 23 insertions, 13 deletions

diff --git a/Documentation/hwmon/lm90 b/Documentation/hwmon/lm90
index 6a03dd4bcc94..d5ce9f4ddd66 100644
--- a/Documentation/hwmon/lm90
+++ b/Documentation/hwmon/lm90
@@ -63,8 +63,8 @@ Supported chips:
     Datasheet: Publicly available at the Maxim website
                http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2578
   * Maxim MAX6659
-    Prefix: 'max6657'
-    Addresses scanned: I2C 0x4c, 0x4d (unsupported 0x4e)
+    Prefix: 'max6659'
+    Addresses scanned: I2C 0x4c, 0x4d, 0x4e
     Datasheet: Publicly available at the Maxim website
                http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2578
   * Maxim MAX6680
diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index e7ef9657ae17..68ee8f78843e 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -85,7 +85,7 @@
  * and MAX6658 have address 0x4c.
  * ADM1032-2, ADT7461-2, LM89-1, LM99-1 and MAX6646 have address 0x4d.
  * MAX6647 has address 0x4e.
- * MAX6659 can have address 0x4c, 0x4d or 0x4e (unsupported).
+ * MAX6659 can have address 0x4c, 0x4d or 0x4e.
  * MAX6680 and MAX6681 can have address 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b,
  * 0x4c, 0x4d or 0x4e.
  */
@@ -93,8 +93,8 @@
 static const unsigned short normal_i2c[] = {
         0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
 
-enum chips { lm90, adm1032, lm99, lm86, max6657, adt7461, max6680, max6646,
-        w83l771 };
+enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
+        max6646, w83l771 };
 
 /*
  * The LM90 registers
@@ -176,7 +176,7 @@ static const struct i2c_device_id lm90_id[] = {
         { "max6649", max6646 },
         { "max6657", max6657 },
         { "max6658", max6657 },
-        { "max6659", max6657 },
+        { "max6659", max6659 },
         { "max6680", max6680 },
         { "max6681", max6680 },
         { "w83l771", w83l771 },
@@ -220,7 +220,7 @@ struct lm90_data {
         s16 temp11[5];  /* 0: remote input
                            1: remote low limit
                            2: remote high limit
-                           3: remote offset (except max6646 and max6657)
+                           3: remote offset (except max6646 and max6657/58/59)
                            4: local input */
         u8 temp_hyst;
         u8 alarms; /* bitvector */
@@ -766,12 +766,20 @@ static int lm90_detect(struct i2c_client *new_client,
                  * register. Likewise, the config1 register seems to lack a
                  * low nibble, so the value will be those of the previous
                  * read, so in our case those of the man_id register.
+                 * MAX6659 has a third set of upper temperature limit registers.
+                 * Those registers also return values on MAX6657 and MAX6658,
+                 * thus the only way to detect MAX6659 is by its address.
+                 * For this reason it will be mis-detected as MAX6657 if its
+                 * address is 0x4C.
                  */
                 if (chip_id == man_id
-                 && (address == 0x4C || address == 0x4D)
+                 && (address == 0x4C || address == 0x4D || address == 0x4E)
                  && (reg_config1 & 0x1F) == (man_id & 0x0F)
                  && reg_convrate <= 0x09) {
-                        name = "max6657";
+                        if (address == 0x4C)
+                                name = "max6657";
+                        else
+                                name = "max6659";
                 } else
                 /*
                  * The chip_id register of the MAX6680 and MAX6681 holds the
@@ -861,14 +869,16 @@ static int lm90_probe(struct i2c_client *new_client,
         }
 
         /* Set chip capabilities */
-        if (data->kind != max6657 && data->kind != max6646)
+        if (data->kind != max6657 && data->kind != max6659
+            && data->kind != max6646)
                 data->flags |= LM90_HAVE_OFFSET;
 
-        if (data->kind == max6657 || data->kind == max6646)
+        if (data->kind == max6657 || data->kind == max6659
+            || data->kind == max6646)
                 data->flags |= LM90_HAVE_LOCAL_EXT;
 
-        if (data->kind != max6657 && data->kind != max6646
-            && data->kind != max6680)
+        if (data->kind != max6657 && data->kind != max6659
+            && data->kind != max6646 && data->kind != max6680)
                 data->flags |= LM90_HAVE_REM_LIMIT_EXT;
 
         /* Initialize the LM90 chip */