hwmon: (adt7475) Add support for the ADT7476

Add support for the Analog Devices ADT7476 chip. This chip is largely
compatible with the ADT7473 and ADT7475, with additional features.
In particular, it has 5 voltage inputs instead of 2, and VID input
pins.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Jordan Crouse <jordan@cosmicpenguin.net>
Cc: "Darrick J. Wong" <djwong@us.ibm.com>

3 files changed, 80 insertions, 25 deletions

diff --git a/Documentation/hwmon/adt7475 b/Documentation/hwmon/adt7475
index f08f28715b84..03be1e6f69cf 100644
--- a/Documentation/hwmon/adt7475
+++ b/Documentation/hwmon/adt7475
@@ -10,6 +10,10 @@ Supported chips:
     Prefix: 'adt7475'
     Addresses scanned: I2C 0x2E
     Datasheet: Publicly available at the On Semiconductors website
+  * Analog Devices ADT7476
+    Prefix: 'adt7476'
+    Addresses scanned: I2C 0x2C, 0x2D, 0x2E
+    Datasheet: Publicly available at the On Semiconductors website
   * Analog Devices ADT7490
     Prefix: 'adt7490'
     Addresses scanned: I2C 0x2C, 0x2D, 0x2E
@@ -25,11 +29,13 @@ Authors:
 Description
 -----------
 
-This driver implements support for the Analog Devices ADT7473, ADT7475 and
-ADT7490 chip family. The ADT7473 and ADT7475 differ only in minor details.
-The ADT7490 has additional features, including extra voltage measurement
-inputs and PECI support. All the supported chips will be collectively
-designed by the name "ADT747x" in the rest of this document.
+This driver implements support for the Analog Devices ADT7473, ADT7475,
+ADT7476 and ADT7490 chip family. The ADT7473 and ADT7475 differ only in
+minor details. The ADT7476 has additional features, including extra voltage
+measurement inputs and VID support. The ADT7490 also has additional
+features, including extra voltage measurement inputs and PECI support. All
+the supported chips will be collectively designed by the name "ADT747x" in
+the rest of this document.
 
 The ADT747x uses the 2-wire interface compatible with the SMBus 2.0
 specification. Using an analog to digital converter it measures three (3)
@@ -62,6 +68,10 @@ ADT7473:
 ADT7475:
   * 2 voltage inputs
 
+ADT7476:
+  * 5 voltage inputs
+  * VID support (not implemented)
+
 ADT7490:
   * 6 voltage inputs
   * 1 Imon input (not implemented)
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index f9f4365349b2..957171c62324 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -205,11 +205,12 @@ config SENSORS_ADT7473
           will be called adt7473.
 
 config SENSORS_ADT7475
-        tristate "Analog Devices ADT7473, ADT7475 and ADT7490"
+        tristate "Analog Devices ADT7473, ADT7475, ADT7476 and ADT7490"
         depends on I2C && EXPERIMENTAL
         help
           If you say yes here you get support for the Analog Devices
-          ADT7473, ADT7475 and ADT7490 hardware monitoring chips.
+          ADT7473, ADT7475, ADT7476 and ADT7490 hardware monitoring
+          chips.
 
           This driver can also be build as a module.  If so, the module
           will be called adt7475.
diff --git a/drivers/hwmon/adt7475.c b/drivers/hwmon/adt7475.c
index eac24c1361bc..72c3b754e7b6 100644
--- a/drivers/hwmon/adt7475.c
+++ b/drivers/hwmon/adt7475.c
@@ -58,6 +58,8 @@
 #define REG_STATUS1             0x41
 #define REG_STATUS2             0x42
 
+#define REG_VID                 0x43    /* ADT7476 only */
+
 #define REG_VOLTAGE_MIN_BASE    0x44
 #define REG_VOLTAGE_MAX_BASE    0x45
 
@@ -94,6 +96,8 @@
 #define REG_VTT_MIN             0x84    /* ADT7490 only */
 #define REG_VTT_MAX             0x86    /* ADT7490 only */
 
+#define VID_VIDSEL              0x80    /* ADT7476 only */
+
 #define CONFIG2_ATTN            0x20
 
 #define CONFIG3_SMBALERT        0x01
@@ -142,11 +146,12 @@
 
 static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
 
-I2C_CLIENT_INSMOD_3(adt7473, adt7475, adt7490);
+I2C_CLIENT_INSMOD_4(adt7473, adt7475, adt7476, adt7490);
 
 static const struct i2c_device_id adt7475_id[] = {
         { "adt7473", adt7473 },
         { "adt7475", adt7475 },
+        { "adt7476", adt7476 },
         { "adt7490", adt7490 },
         { }
 };
@@ -1082,7 +1087,6 @@ static struct attribute *pwm2_attrs[] = {
         NULL
 };
 
-/* Attributes specific to the ADT7490 */
 static struct attribute *in0_attrs[] = {
         &sensor_dev_attr_in0_input.dev_attr.attr,
         &sensor_dev_attr_in0_max.dev_attr.attr,
@@ -1091,15 +1095,23 @@ static struct attribute *in0_attrs[] = {
         NULL
 };
 
-static struct attribute *adt7490_attrs[] = {
+static struct attribute *in3_attrs[] = {
         &sensor_dev_attr_in3_input.dev_attr.attr,
         &sensor_dev_attr_in3_max.dev_attr.attr,
         &sensor_dev_attr_in3_min.dev_attr.attr,
         &sensor_dev_attr_in3_alarm.dev_attr.attr,
+        NULL
+};
+
+static struct attribute *in4_attrs[] = {
         &sensor_dev_attr_in4_input.dev_attr.attr,
         &sensor_dev_attr_in4_max.dev_attr.attr,
         &sensor_dev_attr_in4_min.dev_attr.attr,
         &sensor_dev_attr_in4_alarm.dev_attr.attr,
+        NULL
+};
+
+static struct attribute *in5_attrs[] = {
         &sensor_dev_attr_in5_input.dev_attr.attr,
         &sensor_dev_attr_in5_max.dev_attr.attr,
         &sensor_dev_attr_in5_min.dev_attr.attr,
@@ -1111,7 +1123,9 @@ static struct attribute_group adt7475_attr_group = { .attrs = adt7475_attrs };
 static struct attribute_group fan4_attr_group = { .attrs = fan4_attrs };
 static struct attribute_group pwm2_attr_group = { .attrs = pwm2_attrs };
 static struct attribute_group in0_attr_group = { .attrs = in0_attrs };
-static struct attribute_group adt7490_attr_group = { .attrs = adt7490_attrs };
+static struct attribute_group in3_attr_group = { .attrs = in3_attrs };
+static struct attribute_group in4_attr_group = { .attrs = in4_attrs };
+static struct attribute_group in5_attr_group = { .attrs = in5_attrs };
 
 static int adt7475_detect(struct i2c_client *client, int kind,
                           struct i2c_board_info *info)
@@ -1134,11 +1148,13 @@ static int adt7475_detect(struct i2c_client *client, int kind,
                 name = "adt7473";
         else if (devid == 0x75 && client->addr == 0x2e)
                 name = "adt7475";
+        else if (devid == 0x76)
+                name = "adt7476";
         else if ((devid2 & 0xfc) == 0x6c)
                 name = "adt7490";
         else {
                 dev_dbg(&adapter->dev,
-                        "Couldn't detect an ADT7473/75/90 part at "
+                        "Couldn't detect an ADT7473/75/76/90 part at "
                         "0x%02x\n", (unsigned int)client->addr);
                 return -ENODEV;
         }
@@ -1152,14 +1168,18 @@ static void adt7475_remove_files(struct i2c_client *client,
                                  struct adt7475_data *data)
 {
         sysfs_remove_group(&client->dev.kobj, &adt7475_attr_group);
-        if (data->has_voltage & 0x39)
-                sysfs_remove_group(&client->dev.kobj, &adt7490_attr_group);
         if (data->has_fan4)
                 sysfs_remove_group(&client->dev.kobj, &fan4_attr_group);
         if (data->has_pwm2)
                 sysfs_remove_group(&client->dev.kobj, &pwm2_attr_group);
         if (data->has_voltage & (1 << 0))
                 sysfs_remove_group(&client->dev.kobj, &in0_attr_group);
+        if (data->has_voltage & (1 << 3))
+                sysfs_remove_group(&client->dev.kobj, &in3_attr_group);
+        if (data->has_voltage & (1 << 4))
+                sysfs_remove_group(&client->dev.kobj, &in4_attr_group);
+        if (data->has_voltage & (1 << 5))
+                sysfs_remove_group(&client->dev.kobj, &in5_attr_group);
 }
 
 static int adt7475_probe(struct i2c_client *client,
@@ -1168,6 +1188,7 @@ static int adt7475_probe(struct i2c_client *client,
         static const char *names[] = {
                 [adt7473] = "ADT7473",
                 [adt7475] = "ADT7475",
+                [adt7476] = "ADT7476",
                 [adt7490] = "ADT7490",
         };
 
@@ -1184,6 +1205,10 @@ static int adt7475_probe(struct i2c_client *client,
 
         /* Initialize device-specific values */
         switch (id->driver_data) {
+        case adt7476:
+                data->has_voltage = 0x0e;       /* in1 to in3 */
+                revision = adt7475_read(REG_DEVID2) & 0x07;
+                break;
         case adt7490:
                 data->has_voltage = 0x3e;       /* in1 to in5 */
                 revision = adt7475_read(REG_DEVID2) & 0x03;
@@ -1208,17 +1233,27 @@ static int adt7475_probe(struct i2c_client *client,
         if ((data->config4 & CONFIG4_PINFUNC) == 0x0)
                 data->has_fan4 = 1;
 
-        /* THERM configuration is more complex on the ADT7490, because 2
-           different pins (TACH4 and +2.5 Vin) can be used for this function */
+        /* THERM configuration is more complex on the ADT7476 and ADT7490,
+           because 2 different pins (TACH4 and +2.5 Vin) can be used for
+           this function */
         if (id->driver_data == adt7490) {
                 if ((data->config4 & CONFIG4_PINFUNC) == 0x1 &&
                     !(config3 & CONFIG3_THERM))
                         data->has_fan4 = 1;
+        }
+        if (id->driver_data == adt7476 || id->driver_data == adt7490) {
                 if (!(config3 & CONFIG3_THERM) ||
                     (data->config4 & CONFIG4_PINFUNC) == 0x1)
                         data->has_voltage |= (1 << 0);          /* in0 */
         }
 
+        /* On the ADT7476, the +12V input pin may instead be used as VID5 */
+        if (id->driver_data == adt7476) {
+                u8 vid = adt7475_read(REG_VID);
+                if (!(vid & VID_VIDSEL))
+                        data->has_voltage |= (1 << 4);          /* in4 */
+        }
+
         /* Voltage attenuators can be bypassed, globally or individually */
         config2 = adt7475_read(REG_CONFIG2);
         if (config2 & CONFIG2_ATTN) {
@@ -1238,13 +1273,6 @@ static int adt7475_probe(struct i2c_client *client,
         if (ret)
                 goto efree;
 
-        if (id->driver_data == adt7490) {
-                ret = sysfs_create_group(&client->dev.kobj,
-                                         &adt7490_attr_group);
-                if (ret)
-                        goto eremove;
-        }
-
         /* Features that can be disabled individually */
         if (data->has_fan4) {
                 ret = sysfs_create_group(&client->dev.kobj, &fan4_attr_group);
@@ -1261,6 +1289,21 @@ static int adt7475_probe(struct i2c_client *client,
                 if (ret)
                         goto eremove;
         }
+        if (data->has_voltage & (1 << 3)) {
+                ret = sysfs_create_group(&client->dev.kobj, &in3_attr_group);
+                if (ret)
+                        goto eremove;
+        }
+        if (data->has_voltage & (1 << 4)) {
+                ret = sysfs_create_group(&client->dev.kobj, &in4_attr_group);
+                if (ret)
+                        goto eremove;
+        }
+        if (data->has_voltage & (1 << 5)) {
+                ret = sysfs_create_group(&client->dev.kobj, &in5_attr_group);
+                if (ret)
+                        goto eremove;
+        }
 
         data->hwmon_dev = hwmon_device_register(&client->dev);
         if (IS_ERR(data->hwmon_dev)) {
@@ -1270,9 +1313,10 @@ static int adt7475_probe(struct i2c_client *client,
 
         dev_info(&client->dev, "%s device, revision %d\n",
                  names[id->driver_data], revision);
-        if ((data->has_voltage & (1 << 0)) || data->has_fan4 || data->has_pwm2)
-                dev_info(&client->dev, "Optional features:%s%s%s\n",
+        if ((data->has_voltage & 0x11) || data->has_fan4 || data->has_pwm2)
+                dev_info(&client->dev, "Optional features:%s%s%s%s\n",
                          (data->has_voltage & (1 << 0)) ? " in0" : "",
+                         (data->has_voltage & (1 << 4)) ? " in4" : "",
                          data->has_fan4 ? " fan4" : "",
                          data->has_pwm2 ? " pwm2" : "");
         if (data->bypass_attn)