hwmon: (dme1737) Add support for in7 for SCH5127

Add support for the 1.5V voltage monitoring input (in7) of the
SMSC SCH5127 chip.

Signed-off-by: Juerg Haefliger <juergh@gmail.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 53 insertions, 15 deletions

diff --git a/drivers/hwmon/dme1737.c b/drivers/hwmon/dme1737.c
index e9a610bfd0cc..ec683eabd7ac 100644
--- a/drivers/hwmon/dme1737.c
+++ b/drivers/hwmon/dme1737.c
@@ -77,12 +77,14 @@ enum chips { dme1737, sch5027, sch311x, sch5127 };
  * in4   +12V
  * in5   VTR   (+3.3V stby)
  * in6   Vbat
+ * in7   Vtrip (sch5127 only)
  *
  * --------------------------------------------------------------------- */
 
-/* Voltages (in) numbered 0-6 (ix) */
-#define DME1737_REG_IN(ix)              ((ix) < 5 ? 0x20 + (ix) \
-                                                  : 0x94 + (ix))
+/* Voltages (in) numbered 0-7 (ix) */
+#define DME1737_REG_IN(ix)              ((ix) < 5 ? 0x20 + (ix) : \
+                                         (ix) < 7 ? 0x94 + (ix) : \
+                                                    0x1f)
 #define DME1737_REG_IN_MIN(ix)          ((ix) < 5 ? 0x44 + (ix) * 2 \
                                                   : 0x91 + (ix) * 2)
 #define DME1737_REG_IN_MAX(ix)          ((ix) < 5 ? 0x45 + (ix) * 2 \
@@ -101,10 +103,11 @@ enum chips { dme1737, sch5027, sch311x, sch5127 };
  *    IN_TEMP_LSB(1) = [temp3, temp1]
  *    IN_TEMP_LSB(2) = [in4, temp2]
  *    IN_TEMP_LSB(3) = [in3, in0]
- *    IN_TEMP_LSB(4) = [in2, in1] */
+ *    IN_TEMP_LSB(4) = [in2, in1]
+ *    IN_TEMP_LSB(5) = [res, in7] */
 #define DME1737_REG_IN_TEMP_LSB(ix)     (0x84 + (ix))
-static const u8 DME1737_REG_IN_LSB[] = {3, 4, 4, 3, 2, 0, 0};
-static const u8 DME1737_REG_IN_LSB_SHL[] = {4, 4, 0, 0, 0, 0, 4};
+static const u8 DME1737_REG_IN_LSB[] = {3, 4, 4, 3, 2, 0, 0, 5};
+static const u8 DME1737_REG_IN_LSB_SHL[] = {4, 4, 0, 0, 0, 0, 4, 4};
 static const u8 DME1737_REG_TEMP_LSB[] = {1, 2, 1};
 static const u8 DME1737_REG_TEMP_LSB_SHL[] = {4, 4, 0};
 
@@ -145,7 +148,7 @@ static const u8 DME1737_REG_TEMP_LSB_SHL[] = {4, 4, 0};
 #define DME1737_REG_ALARM1              0x41
 #define DME1737_REG_ALARM2              0x42
 #define DME1737_REG_ALARM3              0x83
-static const u8 DME1737_BIT_ALARM_IN[] = {0, 1, 2, 3, 8, 16, 17};
+static const u8 DME1737_BIT_ALARM_IN[] = {0, 1, 2, 3, 8, 16, 17, 18};
 static const u8 DME1737_BIT_ALARM_TEMP[] = {4, 5, 6};
 static const u8 DME1737_BIT_ALARM_FAN[] = {10, 11, 12, 13, 22, 23};
 
@@ -190,6 +193,7 @@ static const u8 DME1737_BIT_ALARM_FAN[] = {10, 11, 12, 13, 22, 23};
 #define HAS_PWM_MIN             (1 << 4)                /* bit 4 */
 #define HAS_FAN(ix)             (1 << ((ix) + 5))       /* bits 5-10 */
 #define HAS_PWM(ix)             (1 << ((ix) + 11))      /* bits 11-16 */
+#define HAS_IN7                 (1 << 17)               /* bit 17 */
 
 /* ---------------------------------------------------------------------
  * Data structures and manipulation thereof
@@ -213,9 +217,9 @@ struct dme1737_data {
         u32 has_features;
 
         /* Register values */
-        u16 in[7];
-        u8  in_min[7];
-        u8  in_max[7];
+        u16 in[8];
+        u8  in_min[8];
+        u8  in_max[8];
         s16 temp[3];
         s8  temp_min[3];
         s8  temp_max[3];
@@ -247,7 +251,7 @@ static const int IN_NOMINAL_SCH311x[] = {2500, 1500, 3300, 5000, 12000, 3300,
 static const int IN_NOMINAL_SCH5027[] = {5000, 2250, 3300, 1125, 1125, 3300,
                                          3300};
 static const int IN_NOMINAL_SCH5127[] = {2500, 2250, 3300, 1125, 1125, 3300,
-                                         3300};
+                                         3300, 1500};
 #define IN_NOMINAL(type)        ((type) == sch311x ? IN_NOMINAL_SCH311x : \
                                  (type) == sch5027 ? IN_NOMINAL_SCH5027 : \
                                  (type) == sch5127 ? IN_NOMINAL_SCH5127 : \
@@ -580,7 +584,7 @@ static struct dme1737_data *dme1737_update_device(struct device *dev)
 {
         struct dme1737_data *data = dev_get_drvdata(dev);
         int ix;
-        u8 lsb[5];
+        u8 lsb[6];
 
         mutex_lock(&data->update_lock);
 
@@ -603,6 +607,9 @@ static struct dme1737_data *dme1737_update_device(struct device *dev)
                         /* Voltage inputs are stored as 16 bit values even
                          * though they have only 12 bits resolution. This is
                          * to make it consistent with the temp inputs. */
+                        if (ix == 7 && !(data->has_features & HAS_IN7)) {
+                                continue;
+                        }
                         data->in[ix] = dme1737_read(data,
                                         DME1737_REG_IN(ix)) << 8;
                         data->in_min[ix] = dme1737_read(data,
@@ -635,10 +642,16 @@ static struct dme1737_data *dme1737_update_device(struct device *dev)
                  * which the registers are read (MSB first, then LSB) is
                  * important! */
                 for (ix = 0; ix < ARRAY_SIZE(lsb); ix++) {
+                        if (ix == 5 && !(data->has_features & HAS_IN7)) {
+                                continue;
+                        }
                         lsb[ix] = dme1737_read(data,
                                         DME1737_REG_IN_TEMP_LSB(ix));
                 }
                 for (ix = 0; ix < ARRAY_SIZE(data->in); ix++) {
+                        if (ix == 7 && !(data->has_features & HAS_IN7)) {
+                                continue;
+                        }
                         data->in[ix] |= (lsb[DME1737_REG_IN_LSB[ix]] <<
                                         DME1737_REG_IN_LSB_SHL[ix]) & 0xf0;
                 }
@@ -762,7 +775,7 @@ static struct dme1737_data *dme1737_update_device(struct device *dev)
 
 /* ---------------------------------------------------------------------
  * Voltage sysfs attributes
- * ix = [0-5]
+ * ix = [0-7]
  * --------------------------------------------------------------------- */
 
 #define SYS_IN_INPUT    0
@@ -1439,7 +1452,7 @@ static ssize_t show_name(struct device *dev, struct device_attribute *attr,
  * Sysfs device attribute defines and structs
  * --------------------------------------------------------------------- */
 
-/* Voltages 0-6 */
+/* Voltages 0-7 */
 
 #define SENSOR_DEVICE_ATTR_IN(ix) \
 static SENSOR_DEVICE_ATTR_2(in##ix##_input, S_IRUGO, \
@@ -1458,6 +1471,7 @@ SENSOR_DEVICE_ATTR_IN(3);
 SENSOR_DEVICE_ATTR_IN(4);
 SENSOR_DEVICE_ATTR_IN(5);
 SENSOR_DEVICE_ATTR_IN(6);
+SENSOR_DEVICE_ATTR_IN(7);
 
 /* Temperatures 1-3 */
 
@@ -1695,6 +1709,21 @@ static const struct attribute_group dme1737_zone_hyst_group = {
         .attrs = dme1737_zone_hyst_attr,
 };
 
+/* The following struct holds voltage in7 related attributes, which
+ * are not available in all chips. The following chips support them:
+ * SCH5127 */
+static struct attribute *dme1737_in7_attr[] = {
+        &sensor_dev_attr_in7_input.dev_attr.attr,
+        &sensor_dev_attr_in7_min.dev_attr.attr,
+        &sensor_dev_attr_in7_max.dev_attr.attr,
+        &sensor_dev_attr_in7_alarm.dev_attr.attr,
+        NULL
+};
+
+static const struct attribute_group dme1737_in7_group = {
+        .attrs = dme1737_in7_attr,
+};
+
 /* The following structs hold the PWM attributes, some of which are optional.
  * Their creation depends on the chip configuration which is determined during
  * module load. */
@@ -1986,6 +2015,9 @@ static void dme1737_remove_files(struct device *dev)
         if (data->has_features & HAS_ZONE_HYST) {
                 sysfs_remove_group(&dev->kobj, &dme1737_zone_hyst_group);
         }
+        if (data->has_features & HAS_IN7) {
+                sysfs_remove_group(&dev->kobj, &dme1737_in7_group);
+        }
         sysfs_remove_group(&dev->kobj, &dme1737_group);
 
         if (!data->client) {
@@ -2030,6 +2062,12 @@ static int dme1737_create_files(struct device *dev)
                                       &dme1737_zone_hyst_group))) {
                 goto exit_remove;
         }
+        if (data->has_features & HAS_IN7) {
+                err = sysfs_create_group(&dev->kobj, &dme1737_in7_group);
+                if (err) {
+                        goto exit_remove;
+                }
+        }
 
         /* Create fan sysfs attributes */
         for (ix = 0; ix < ARRAY_SIZE(dme1737_fan_group); ix++) {
@@ -2188,7 +2226,7 @@ static int dme1737_init_device(struct device *dev)
                 data->has_features |= HAS_ZONE3;
                 break;
         case sch5127:
-                data->has_features |= HAS_FAN(2) | HAS_PWM(2);
+                data->has_features |= HAS_FAN(2) | HAS_PWM(2) | HAS_IN7;
                 break;
         default:
                 break;