hwmon: (dme1737) Add SCH5127 support

Add support for the hardware monitoring capabilities of the SCH5127
chip to the dme1737 driver.

Signed-off-by: Juerg Haefliger <juergh@gmail.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Tested-by: Jeff Rickman <jrickman@myamigos.us>

1 files changed, 225 insertions, 103 deletions

diff --git a/drivers/hwmon/dme1737.c b/drivers/hwmon/dme1737.c
index 823dd28a902c..980c17d5eeae 100644
--- a/drivers/hwmon/dme1737.c
+++ b/drivers/hwmon/dme1737.c
@@ -1,12 +1,14 @@
 /*
- * dme1737.c - Driver for the SMSC DME1737, Asus A8000, SMSC SCH311x and
- *             SCH5027 Super-I/O chips integrated hardware monitoring features.
- * Copyright (c) 2007, 2008 Juerg Haefliger <juergh@gmail.com>
+ * dme1737.c - Driver for the SMSC DME1737, Asus A8000, SMSC SCH311x, SCH5027,
+ *             and SCH5127 Super-I/O chips integrated hardware monitoring
+ *             features.
+ * Copyright (c) 2007, 2008, 2009, 2010 Juerg Haefliger <juergh@gmail.com>
  *
  * This driver is an I2C/ISA hybrid, meaning that it uses the I2C bus to access
  * the chip registers if a DME1737, A8000, or SCH5027 is found and the ISA bus
- * if a SCH311x chip is found. Both types of chips have very similar hardware
- * monitoring capabilities but differ in the way they can be accessed.
+ * if a SCH311x or SCH5127 chip is found. Both types of chips have very
+ * similar hardware monitoring capabilities but differ in the way they can be
+ * accessed.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -57,7 +59,7 @@ MODULE_PARM_DESC(probe_all_addr, "Include probing of non-standard LPC "
 /* Addresses to scan */
 static const unsigned short normal_i2c[] = {0x2c, 0x2d, 0x2e, I2C_CLIENT_END};
 
-enum chips { dme1737, sch5027, sch311x };
+enum chips { dme1737, sch5027, sch311x, sch5127 };
 
 /* ---------------------------------------------------------------------
  * Registers
@@ -164,10 +166,29 @@ static const u8 DME1737_BIT_ALARM_FAN[] = {10, 11, 12, 13, 22, 23};
 #define DME1737_VERSTEP_MASK    0xf8
 #define SCH311X_DEVICE          0x8c
 #define SCH5027_VERSTEP         0x69
+#define SCH5127_DEVICE          0x8e
+
+/* Device ID values (global configuration register index 0x20) */
+#define DME1737_ID_1    0x77
+#define DME1737_ID_2    0x78
+#define SCH3112_ID      0x7c
+#define SCH3114_ID      0x7d
+#define SCH3116_ID      0x7f
+#define SCH5027_ID      0x89
+#define SCH5127_ID      0x86
 
 /* Length of ISA address segment */
 #define DME1737_EXTENT  2
 
+/* chip-dependent features */
+#define HAS_TEMP_OFFSET         (1 << 0)                /* bit 0 */
+#define HAS_VID                 (1 << 1)                /* bit 1 */
+#define HAS_ZONE3               (1 << 2)                /* bit 2 */
+#define HAS_ZONE_HYST           (1 << 3)                /* bit 3 */
+#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 */
+
 /* ---------------------------------------------------------------------
  * Data structures and manipulation thereof
  * --------------------------------------------------------------------- */
@@ -187,8 +208,7 @@ struct dme1737_data {
 
         u8 vid;
         u8 pwm_rr_en;
-        u8 has_pwm;
-        u8 has_fan;
+        u32 has_features;
 
         /* Register values */
         u16 in[7];
@@ -224,8 +244,11 @@ static const int IN_NOMINAL_SCH311x[] = {2500, 1500, 3300, 5000, 12000, 3300,
                                          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};
 #define IN_NOMINAL(type)        ((type) == sch311x ? IN_NOMINAL_SCH311x : \
                                  (type) == sch5027 ? IN_NOMINAL_SCH5027 : \
+                                 (type) == sch5127 ? IN_NOMINAL_SCH5127 : \
                                  IN_NOMINAL_DME1737)
 
 /* Voltage input
@@ -568,7 +591,7 @@ static struct dme1737_data *dme1737_update_device(struct device *dev)
 
         /* Sample register contents every 1 sec */
         if (time_after(jiffies, data->last_update + HZ) || !data->valid) {
-                if (data->type == dme1737) {
+                if (data->has_features & HAS_VID) {
                         data->vid = dme1737_read(data, DME1737_REG_VID) &
                                 0x3f;
                 }
@@ -599,7 +622,7 @@ static struct dme1737_data *dme1737_update_device(struct device *dev)
                                         DME1737_REG_TEMP_MIN(ix));
                         data->temp_max[ix] = dme1737_read(data,
                                         DME1737_REG_TEMP_MAX(ix));
-                        if (data->type != sch5027) {
+                        if (data->has_features & HAS_TEMP_OFFSET) {
                                 data->temp_offset[ix] = dme1737_read(data,
                                                 DME1737_REG_TEMP_OFFSET(ix));
                         }
@@ -626,7 +649,7 @@ static struct dme1737_data *dme1737_update_device(struct device *dev)
                 for (ix = 0; ix < ARRAY_SIZE(data->fan); ix++) {
                         /* Skip reading registers if optional fans are not
                          * present */
-                        if (!(data->has_fan & (1 << ix))) {
+                        if (!(data->has_features & HAS_FAN(ix))) {
                                 continue;
                         }
                         data->fan[ix] = dme1737_read(data,
@@ -650,7 +673,7 @@ static struct dme1737_data *dme1737_update_device(struct device *dev)
                 for (ix = 0; ix < ARRAY_SIZE(data->pwm); ix++) {
                         /* Skip reading registers if optional PWMs are not
                          * present */
-                        if (!(data->has_pwm & (1 << ix))) {
+                        if (!(data->has_features & HAS_PWM(ix))) {
                                 continue;
                         }
                         data->pwm[ix] = dme1737_read(data,
@@ -672,12 +695,24 @@ static struct dme1737_data *dme1737_update_device(struct device *dev)
 
                 /* Thermal zone registers */
                 for (ix = 0; ix < ARRAY_SIZE(data->zone_low); ix++) {
-                        data->zone_low[ix] = dme1737_read(data,
-                                        DME1737_REG_ZONE_LOW(ix));
-                        data->zone_abs[ix] = dme1737_read(data,
-                                        DME1737_REG_ZONE_ABS(ix));
+                        /* Skip reading registers if zone3 is not present */
+                        if ((ix == 2) && !(data->has_features & HAS_ZONE3)) {
+                                continue;
+                        }
+                        /* sch5127 zone2 registers are special */
+                        if ((ix == 1) && (data->type == sch5127)) {
+                                data->zone_low[1] = dme1737_read(data,
+                                                DME1737_REG_ZONE_LOW(2));
+                                data->zone_abs[1] = dme1737_read(data,
+                                                DME1737_REG_ZONE_ABS(2));
+                        } else {
+                                data->zone_low[ix] = dme1737_read(data,
+                                                DME1737_REG_ZONE_LOW(ix));
+                                data->zone_abs[ix] = dme1737_read(data,
+                                                DME1737_REG_ZONE_ABS(ix));
+                        }
                 }
-                if (data->type != sch5027) {
+                if (data->has_features & HAS_ZONE_HYST) {
                         for (ix = 0; ix < ARRAY_SIZE(data->zone_hyst); ix++) {
                                 data->zone_hyst[ix] = dme1737_read(data,
                                                 DME1737_REG_ZONE_HYST(ix));
@@ -1594,10 +1629,6 @@ static struct attribute *dme1737_attr[] ={
         &sensor_dev_attr_zone2_auto_point2_temp.dev_attr.attr,
         &sensor_dev_attr_zone2_auto_point3_temp.dev_attr.attr,
         &sensor_dev_attr_zone2_auto_channels_temp.dev_attr.attr,
-        &sensor_dev_attr_zone3_auto_point1_temp.dev_attr.attr,
-        &sensor_dev_attr_zone3_auto_point2_temp.dev_attr.attr,
-        &sensor_dev_attr_zone3_auto_point3_temp.dev_attr.attr,
-        &sensor_dev_attr_zone3_auto_channels_temp.dev_attr.attr,
         NULL
 };
 
@@ -1605,27 +1636,23 @@ static const struct attribute_group dme1737_group = {
         .attrs = dme1737_attr,
 };
 
-/* The following struct holds misc attributes, which are not available in all
- * chips. Their creation depends on the chip type which is determined during
- * module load. */
-static struct attribute *dme1737_misc_attr[] = {
-        /* Temperatures */
+/* The following struct holds temp offset attributes, which are not available
+ * in all chips. The following chips support them:
+ * DME1737, SCH311x */
+static struct attribute *dme1737_temp_offset_attr[] = {
         &sensor_dev_attr_temp1_offset.dev_attr.attr,
         &sensor_dev_attr_temp2_offset.dev_attr.attr,
         &sensor_dev_attr_temp3_offset.dev_attr.attr,
-        /* Zones */
-        &sensor_dev_attr_zone1_auto_point1_temp_hyst.dev_attr.attr,
-        &sensor_dev_attr_zone2_auto_point1_temp_hyst.dev_attr.attr,
-        &sensor_dev_attr_zone3_auto_point1_temp_hyst.dev_attr.attr,
         NULL
 };
 
-static const struct attribute_group dme1737_misc_group = {
-        .attrs = dme1737_misc_attr,
+static const struct attribute_group dme1737_temp_offset_group = {
+        .attrs = dme1737_temp_offset_attr,
 };
 
-/* The following struct holds VID-related attributes. Their creation
-   depends on the chip type which is determined during module load. */
+/* The following struct holds VID related attributes, which are not available
+ * in all chips. The following chips support them:
+ * DME1737 */
 static struct attribute *dme1737_vid_attr[] = {
         &dev_attr_vrm.attr,
         &dev_attr_cpu0_vid.attr,
@@ -1636,6 +1663,36 @@ static const struct attribute_group dme1737_vid_group = {
         .attrs = dme1737_vid_attr,
 };
 
+/* The following struct holds temp zone 3 related attributes, which are not
+ * available in all chips. The following chips support them:
+ * DME1737, SCH311x, SCH5027 */
+static struct attribute *dme1737_zone3_attr[] = {
+        &sensor_dev_attr_zone3_auto_point1_temp.dev_attr.attr,
+        &sensor_dev_attr_zone3_auto_point2_temp.dev_attr.attr,
+        &sensor_dev_attr_zone3_auto_point3_temp.dev_attr.attr,
+        &sensor_dev_attr_zone3_auto_channels_temp.dev_attr.attr,
+        NULL
+};
+
+static const struct attribute_group dme1737_zone3_group = {
+        .attrs = dme1737_zone3_attr,
+};
+
+
+/* The following struct holds temp zone hysteresis  related attributes, which
+ * are not available in all chips. The following chips support them:
+ * DME1737, SCH311x */
+static struct attribute *dme1737_zone_hyst_attr[] = {
+        &sensor_dev_attr_zone1_auto_point1_temp_hyst.dev_attr.attr,
+        &sensor_dev_attr_zone2_auto_point1_temp_hyst.dev_attr.attr,
+        &sensor_dev_attr_zone3_auto_point1_temp_hyst.dev_attr.attr,
+        NULL
+};
+
+static const struct attribute_group dme1737_zone_hyst_group = {
+        .attrs = dme1737_zone_hyst_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. */
@@ -1691,10 +1748,10 @@ static const struct attribute_group dme1737_pwm_group[] = {
         { .attrs = dme1737_pwm6_attr },
 };
 
-/* The following struct holds misc PWM attributes, which are not available in
- * all chips. Their creation depends on the chip type which is determined
+/* The following struct holds auto PWM min attributes, which are not available
+ * in all chips. Their creation depends on the chip type which is determined
  * during module load. */
-static struct attribute *dme1737_pwm_misc_attr[] = {
+static struct attribute *dme1737_auto_pwm_min_attr[] = {
         &sensor_dev_attr_pwm1_auto_pwm_min.dev_attr.attr,
         &sensor_dev_attr_pwm2_auto_pwm_min.dev_attr.attr,
         &sensor_dev_attr_pwm3_auto_pwm_min.dev_attr.attr,
@@ -1764,14 +1821,25 @@ static struct attribute *dme1737_zone_chmod_attr[] = {
         &sensor_dev_attr_zone2_auto_point1_temp.dev_attr.attr,
         &sensor_dev_attr_zone2_auto_point2_temp.dev_attr.attr,
         &sensor_dev_attr_zone2_auto_point3_temp.dev_attr.attr,
+        NULL
+};
+
+static const struct attribute_group dme1737_zone_chmod_group = {
+        .attrs = dme1737_zone_chmod_attr,
+};
+
+
+/* The permissions of the following zone 3 attributes are changed to read-
+ * writeable if the chip is *not* locked. Otherwise they stay read-only. */
+static struct attribute *dme1737_zone3_chmod_attr[] = {
         &sensor_dev_attr_zone3_auto_point1_temp.dev_attr.attr,
         &sensor_dev_attr_zone3_auto_point2_temp.dev_attr.attr,
         &sensor_dev_attr_zone3_auto_point3_temp.dev_attr.attr,
         NULL
 };
 
-static const struct attribute_group dme1737_zone_chmod_group = {
-        .attrs = dme1737_zone_chmod_attr,
+static const struct attribute_group dme1737_zone3_chmod_group = {
+        .attrs = dme1737_zone3_chmod_attr,
 };
 
 /* The permissions of the following PWM attributes are changed to read-
@@ -1887,30 +1955,35 @@ static void dme1737_remove_files(struct device *dev)
         int ix;
 
         for (ix = 0; ix < ARRAY_SIZE(dme1737_fan_group); ix++) {
-                if (data->has_fan & (1 << ix)) {
+                if (data->has_features & HAS_FAN(ix)) {
                         sysfs_remove_group(&dev->kobj,
                                            &dme1737_fan_group[ix]);
                 }
         }
 
         for (ix = 0; ix < ARRAY_SIZE(dme1737_pwm_group); ix++) {
-                if (data->has_pwm & (1 << ix)) {
+                if (data->has_features & HAS_PWM(ix)) {
                         sysfs_remove_group(&dev->kobj,
                                            &dme1737_pwm_group[ix]);
-                        if (data->type != sch5027 && ix < 3) {
+                        if ((data->has_features & HAS_PWM_MIN) && ix < 3) {
                                 sysfs_remove_file(&dev->kobj,
-                                                  dme1737_pwm_misc_attr[ix]);
+                                                dme1737_auto_pwm_min_attr[ix]);
                         }
                 }
         }
 
-        if (data->type != sch5027) {
-                sysfs_remove_group(&dev->kobj, &dme1737_misc_group);
+        if (data->has_features & HAS_TEMP_OFFSET) {
+                sysfs_remove_group(&dev->kobj, &dme1737_temp_offset_group);
         }
-        if (data->type == dme1737) {
+        if (data->has_features & HAS_VID) {
                 sysfs_remove_group(&dev->kobj, &dme1737_vid_group);
         }
-
+        if (data->has_features & HAS_ZONE3) {
+                sysfs_remove_group(&dev->kobj, &dme1737_zone3_group);
+        }
+        if (data->has_features & HAS_ZONE_HYST) {
+                sysfs_remove_group(&dev->kobj, &dme1737_zone_hyst_group);
+        }
         sysfs_remove_group(&dev->kobj, &dme1737_group);
 
         if (!data->client) {
@@ -1934,23 +2007,31 @@ static int dme1737_create_files(struct device *dev)
                 goto exit_remove;
         }
 
-        /* Create misc sysfs attributes */
-        if ((data->type != sch5027) &&
+        /* Create chip-dependent sysfs attributes */
+        if ((data->has_features & HAS_TEMP_OFFSET) &&
             (err = sysfs_create_group(&dev->kobj,
-                                      &dme1737_misc_group))) {
+                                      &dme1737_temp_offset_group))) {
                 goto exit_remove;
         }
-
-        /* Create VID-related sysfs attributes */
-        if ((data->type == dme1737) &&
+        if ((data->has_features & HAS_VID) &&
             (err = sysfs_create_group(&dev->kobj,
                                       &dme1737_vid_group))) {
                 goto exit_remove;
         }
+        if ((data->has_features & HAS_ZONE3) &&
+            (err = sysfs_create_group(&dev->kobj,
+                                      &dme1737_zone3_group))) {
+                goto exit_remove;
+        }
+        if ((data->has_features & HAS_ZONE_HYST) &&
+            (err = sysfs_create_group(&dev->kobj,
+                                      &dme1737_zone_hyst_group))) {
+                goto exit_remove;
+        }
 
         /* Create fan sysfs attributes */
         for (ix = 0; ix < ARRAY_SIZE(dme1737_fan_group); ix++) {
-                if (data->has_fan & (1 << ix)) {
+                if (data->has_features & HAS_FAN(ix)) {
                         if ((err = sysfs_create_group(&dev->kobj,
                                                 &dme1737_fan_group[ix]))) {
                                 goto exit_remove;
@@ -1960,14 +2041,14 @@ static int dme1737_create_files(struct device *dev)
 
         /* Create PWM sysfs attributes */
         for (ix = 0; ix < ARRAY_SIZE(dme1737_pwm_group); ix++) {
-                if (data->has_pwm & (1 << ix)) {
+                if (data->has_features & HAS_PWM(ix)) {
                         if ((err = sysfs_create_group(&dev->kobj,
                                                 &dme1737_pwm_group[ix]))) {
                                 goto exit_remove;
                         }
-                        if (data->type != sch5027 && ix < 3 &&
+                        if ((data->has_features & HAS_PWM_MIN) && ix < 3 &&
                             (err = sysfs_create_file(&dev->kobj,
-                                                dme1737_pwm_misc_attr[ix]))) {
+                                        dme1737_auto_pwm_min_attr[ix]))) {
                                 goto exit_remove;
                         }
                 }
@@ -1983,21 +2064,30 @@ static int dme1737_create_files(struct device *dev)
                 dme1737_chmod_group(dev, &dme1737_zone_chmod_group,
                                     S_IRUGO | S_IWUSR);
 
-                /* Change permissions of misc sysfs attributes */
-                if (data->type != sch5027) {
-                        dme1737_chmod_group(dev, &dme1737_misc_group,
+                /* Change permissions of chip-dependent sysfs attributes */
+                if (data->has_features & HAS_TEMP_OFFSET) {
+                        dme1737_chmod_group(dev, &dme1737_temp_offset_group,
+                                            S_IRUGO | S_IWUSR);
+                }
+                if (data->has_features & HAS_ZONE3) {
+                        dme1737_chmod_group(dev, &dme1737_zone3_chmod_group,
+                                            S_IRUGO | S_IWUSR);
+                }
+                if (data->has_features & HAS_ZONE_HYST) {
+                        dme1737_chmod_group(dev, &dme1737_zone_hyst_group,
                                             S_IRUGO | S_IWUSR);
                 }
 
                 /* Change permissions of PWM sysfs attributes */
                 for (ix = 0; ix < ARRAY_SIZE(dme1737_pwm_chmod_group); ix++) {
-                        if (data->has_pwm & (1 << ix)) {
+                        if (data->has_features & HAS_PWM(ix)) {
                                 dme1737_chmod_group(dev,
                                                 &dme1737_pwm_chmod_group[ix],
                                                 S_IRUGO | S_IWUSR);
-                                if (data->type != sch5027 && ix < 3) {
+                                if ((data->has_features & HAS_PWM_MIN) &&
+                                    ix < 3) {
                                         dme1737_chmod_file(dev,
-                                                dme1737_pwm_misc_attr[ix],
+                                                dme1737_auto_pwm_min_attr[ix],
                                                 S_IRUGO | S_IWUSR);
                                 }
                         }
@@ -2005,7 +2095,7 @@ static int dme1737_create_files(struct device *dev)
 
                 /* Change permissions of pwm[1-3] if in manual mode */
                 for (ix = 0; ix < 3; ix++) {
-                        if ((data->has_pwm & (1 << ix)) &&
+                        if ((data->has_features & HAS_PWM(ix)) &&
                             (PWM_EN_FROM_REG(data->pwm_config[ix]) == 1)) {
                                 dme1737_chmod_file(dev,
                                                 dme1737_pwm_chmod_attr[ix],
@@ -2052,20 +2142,20 @@ static int dme1737_init_device(struct device *dev)
                 return -EFAULT;
         }
 
-        /* Determine which optional fan and pwm features are enabled/present */
+        /* Determine which optional fan and pwm features are enabled (only
+         * valid for I2C devices) */
         if (client) {   /* I2C chip */
                 data->config2 = dme1737_read(data, DME1737_REG_CONFIG2);
                 /* Check if optional fan3 input is enabled */
                 if (data->config2 & 0x04) {
-                        data->has_fan |= (1 << 2);
+                        data->has_features |= HAS_FAN(2);
                 }
 
                 /* Fan4 and pwm3 are only available if the client's I2C address
                  * is the default 0x2e. Otherwise the I/Os associated with
                  * these functions are used for addr enable/select. */
                 if (client->addr == 0x2e) {
-                        data->has_fan |= (1 << 3);
-                        data->has_pwm |= (1 << 2);
+                        data->has_features |= HAS_FAN(3) | HAS_PWM(2);
                 }
 
                 /* Determine which of the optional fan[5-6] and pwm[5-6]
@@ -2077,26 +2167,40 @@ static int dme1737_init_device(struct device *dev)
                         dev_warn(dev, "Failed to query Super-IO for optional "
                                  "features.\n");
                 }
-        } else {   /* ISA chip */
-                /* Fan3 and pwm3 are always available. Fan[4-5] and pwm[5-6]
-                 * don't exist in the ISA chip. */
-                data->has_fan |= (1 << 2);
-                data->has_pwm |= (1 << 2);
         }
 
-        /* Fan1, fan2, pwm1, and pwm2 are always present */
-        data->has_fan |= 0x03;
-        data->has_pwm |= 0x03;
+        /* Fan[1-2] and pwm[1-2] are present in all chips */
+        data->has_features |= HAS_FAN(0) | HAS_FAN(1) | HAS_PWM(0) | HAS_PWM(1);
+
+        /* Chip-dependent features */
+        switch (data->type) {
+        case dme1737:
+                data->has_features |= HAS_TEMP_OFFSET | HAS_VID | HAS_ZONE3 |
+                        HAS_ZONE_HYST | HAS_PWM_MIN;
+                break;
+        case sch311x:
+                data->has_features |= HAS_TEMP_OFFSET | HAS_ZONE3 |
+                        HAS_ZONE_HYST | HAS_PWM_MIN | HAS_FAN(2) | HAS_PWM(2);
+                break;
+        case sch5027:
+                data->has_features |= HAS_ZONE3;
+                break;
+        case sch5127:
+                data->has_features |= HAS_FAN(2) | HAS_PWM(2);
+                break;
+        default:
+                break;
+        }
 
         dev_info(dev, "Optional features: pwm3=%s, pwm5=%s, pwm6=%s, "
                  "fan3=%s, fan4=%s, fan5=%s, fan6=%s.\n",
-                 (data->has_pwm & (1 << 2)) ? "yes" : "no",
-                 (data->has_pwm & (1 << 4)) ? "yes" : "no",
-                 (data->has_pwm & (1 << 5)) ? "yes" : "no",
-                 (data->has_fan & (1 << 2)) ? "yes" : "no",
-                 (data->has_fan & (1 << 3)) ? "yes" : "no",
-                 (data->has_fan & (1 << 4)) ? "yes" : "no",
-                 (data->has_fan & (1 << 5)) ? "yes" : "no");
+                 (data->has_features & HAS_PWM(2)) ? "yes" : "no",
+                 (data->has_features & HAS_PWM(4)) ? "yes" : "no",
+                 (data->has_features & HAS_PWM(5)) ? "yes" : "no",
+                 (data->has_features & HAS_FAN(2)) ? "yes" : "no",
+                 (data->has_features & HAS_FAN(3)) ? "yes" : "no",
+                 (data->has_features & HAS_FAN(4)) ? "yes" : "no",
+                 (data->has_features & HAS_FAN(5)) ? "yes" : "no");
 
         reg = dme1737_read(data, DME1737_REG_TACH_PWM);
         /* Inform if fan-to-pwm mapping differs from the default */
@@ -2122,7 +2226,7 @@ static int dme1737_init_device(struct device *dev)
                 for (ix = 0; ix < 3; ix++) {
                         data->pwm_config[ix] = dme1737_read(data,
                                                 DME1737_REG_PWM_CONFIG(ix));
-                        if ((data->has_pwm & (1 << ix)) &&
+                        if ((data->has_features & HAS_PWM(ix)) &&
                             (PWM_EN_FROM_REG(data->pwm_config[ix]) == -1)) {
                                 dev_info(dev, "Switching pwm%d to "
                                          "manual mode.\n", ix + 1);
@@ -2142,7 +2246,7 @@ static int dme1737_init_device(struct device *dev)
         data->pwm_acz[2] = 4;   /* pwm3 -> zone3 */
 
         /* Set VRM */
-        if (data->type == dme1737) {
+        if (data->has_features & HAS_VID) {
                 data->vrm = vid_which_vrm();
         }
 
@@ -2163,10 +2267,10 @@ static int dme1737_i2c_get_features(int sio_cip, struct dme1737_data *data)
         dme1737_sio_enter(sio_cip);
 
         /* Check device ID
-         * The DME1737 can return either 0x78 or 0x77 as its device ID.
-         * The SCH5027 returns 0x89 as its device ID. */
+         * We currently know about two kinds of DME1737 and SCH5027. */
         reg = force_id ? force_id : dme1737_sio_inb(sio_cip, 0x20);
-        if (!(reg == 0x77 || reg == 0x78 || reg == 0x89)) {
+        if (!(reg == DME1737_ID_1 || reg == DME1737_ID_2 ||
+              reg == SCH5027_ID)) {
                 err = -ENODEV;
                 goto exit;
         }
@@ -2185,16 +2289,16 @@ static int dme1737_i2c_get_features(int sio_cip, struct dme1737_data *data)
          * are enabled and available. Bits [3:2] of registers 0x43-0x46 are set
          * to '10' if the respective feature is enabled. */
         if ((inb(addr + 0x43) & 0x0c) == 0x08) { /* fan6 */
-                data->has_fan |= (1 << 5);
+                data->has_features |= HAS_FAN(5);
         }
         if ((inb(addr + 0x44) & 0x0c) == 0x08) { /* pwm6 */
-                data->has_pwm |= (1 << 5);
+                data->has_features |= HAS_PWM(5);
         }
         if ((inb(addr + 0x45) & 0x0c) == 0x08) { /* fan5 */
-                data->has_fan |= (1 << 4);
+                data->has_features |= HAS_FAN(4);
         }
         if ((inb(addr + 0x46) & 0x0c) == 0x08) { /* pwm5 */
-                data->has_pwm |= (1 << 4);
+                data->has_features |= HAS_PWM(4);
         }
 
 exit:
@@ -2222,7 +2326,6 @@ static int dme1737_i2c_detect(struct i2c_client *client,
         if (company == DME1737_COMPANY_SMSC &&
             verstep == SCH5027_VERSTEP) {
                 name = "sch5027";
-
         } else if (company == DME1737_COMPANY_SMSC &&
                    (verstep & DME1737_VERSTEP_MASK) == DME1737_VERSTEP) {
                 name = "dme1737";
@@ -2329,10 +2432,10 @@ static int __init dme1737_isa_detect(int sio_cip, unsigned short *addr)
         dme1737_sio_enter(sio_cip);
 
         /* Check device ID
-         * We currently know about SCH3112 (0x7c), SCH3114 (0x7d), and
-         * SCH3116 (0x7f). */
+         * We currently know about SCH3112, SCH3114, SCH3116, and SCH5127 */
         reg = force_id ? force_id : dme1737_sio_inb(sio_cip, 0x20);
-        if (!(reg == 0x7c || reg == 0x7d || reg == 0x7f)) {
+        if (!(reg == SCH3112_ID || reg == SCH3114_ID || reg == SCH3116_ID ||
+              reg == SCH5127_ID)) {
                 err = -ENODEV;
                 goto exit;
         }
@@ -2424,23 +2527,42 @@ static int __devinit dme1737_isa_probe(struct platform_device *pdev)
         platform_set_drvdata(pdev, data);
 
         /* Skip chip detection if module is loaded with force_id parameter */
-        if (!force_id) {
+        switch (force_id) {
+        case SCH3112_ID:
+        case SCH3114_ID:
+        case SCH3116_ID:
+                data->type = sch311x;
+                break;
+        case SCH5127_ID:
+                data->type = sch5127;
+                break;
+        default:
                 company = dme1737_read(data, DME1737_REG_COMPANY);
                 device = dme1737_read(data, DME1737_REG_DEVICE);
 
-                if (!((company == DME1737_COMPANY_SMSC) &&
-                      (device == SCH311X_DEVICE))) {
+                if ((company == DME1737_COMPANY_SMSC) &&
+                    (device == SCH311X_DEVICE)) {
+                        data->type = sch311x;
+                } else if ((company == DME1737_COMPANY_SMSC) &&
+                           (device == SCH5127_DEVICE)) {
+                        data->type = sch5127;
+                } else {
                         err = -ENODEV;
                         goto exit_kfree;
                 }
         }
-        data->type = sch311x;
 
-        /* Fill in the remaining client fields and initialize the mutex */
-        data->name = "sch311x";
+        if (data->type == sch5127) {
+                data->name = "sch5127";
+        } else {
+                data->name = "sch311x";
+        }
+
+        /* Initialize the mutex */
         mutex_init(&data->update_lock);
 
-        dev_info(dev, "Found a SCH311x chip at 0x%04x\n", data->addr);
+        dev_info(dev, "Found a %s chip at 0x%04x\n",
+                 data->type == sch5127 ? "SCH5127" : "SCH311x", data->addr);
 
         /* Initialize the chip */
         if ((err = dme1737_init_device(dev))) {