hwmon: (pmbus/adm1275) Add support for ADM1276

ADM1276 is mostly compatible to ADM1275, with added support for input power
measurement. Add support for it to the ADM1275 driver.

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

3 files changed, 72 insertions, 24 deletions

diff --git a/Documentation/hwmon/adm1275 b/Documentation/hwmon/adm1275
index c438c98bdbc8..ab70d96d2dfd 100644
--- a/Documentation/hwmon/adm1275
+++ b/Documentation/hwmon/adm1275
@@ -6,6 +6,10 @@ Supported chips:
     Prefix: 'adm1275'
     Addresses scanned: -
     Datasheet: www.analog.com/static/imported-files/data_sheets/ADM1275.pdf
+  * Analog Devices ADM1276
+    Prefix: 'adm1276'
+    Addresses scanned: -
+    Datasheet: www.analog.com/static/imported-files/data_sheets/ADM1276.pdf
 
 Author: Guenter Roeck <guenter.roeck@ericsson.com>
 
@@ -13,13 +17,13 @@ Author: Guenter Roeck <guenter.roeck@ericsson.com>
 Description
 -----------
 
-This driver supports hardware montoring for Analog Devices ADM1275 Hot-Swap
-Controller and Digital Power Monitor.
+This driver supports hardware montoring for Analog Devices ADM1275 and ADM1276
+Hot-Swap Controller and Digital Power Monitor.
 
-The ADM1275 is a hot-swap controller that allows a circuit board to be removed
-from or inserted into a live backplane. It also features current and voltage
-readback via an integrated 12-bit analog-to-digital converter (ADC), accessed
-using a PMBus. interface.
+ADM1275 and ADM1276 are hot-swap controllers that allow a circuit board to be
+removed from or inserted into a live backplane. They also feature current and
+voltage readback via an integrated 12-bit analog-to-digital converter (ADC),
+accessed using a PMBus interface.
 
 The driver is a client driver to the core PMBus driver. Please see
 Documentation/hwmon/pmbus for details on PMBus client drivers.
@@ -48,18 +52,18 @@ attributes are write-only, all other attributes are read-only.
 
 in1_label               "vin1" or "vout1" depending on chip variant and
                         configuration.
-in1_input               Measured voltage. From READ_VOUT register.
-in1_min                 Minumum Voltage. From VOUT_UV_WARN_LIMIT register.
-in1_max                 Maximum voltage. From VOUT_OV_WARN_LIMIT register.
-in1_min_alarm           Voltage low alarm. From VOLTAGE_UV_WARNING status.
-in1_max_alarm           Voltage high alarm. From VOLTAGE_OV_WARNING status.
+in1_input               Measured voltage.
+in1_min                 Minumum Voltage.
+in1_max                 Maximum voltage.
+in1_min_alarm           Voltage low alarm.
+in1_max_alarm           Voltage high alarm.
 in1_highest             Historical maximum voltage.
 in1_reset_history       Write any value to reset history.
 
 curr1_label             "iout1"
-curr1_input             Measured current. From READ_IOUT register.
-curr1_max               Maximum current. From IOUT_OC_WARN_LIMIT register.
-curr1_max_alarm         Current high alarm. From IOUT_OC_WARN_LIMIT register.
+curr1_input             Measured current.
+curr1_max               Maximum current.
+curr1_max_alarm         Current high alarm.
 curr1_lcrit             Critical minimum current. Depending on the chip
                         configuration, either curr1_lcrit or curr1_crit is
                         supported, but not both.
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index c9237b9dcff2..37575582e51a 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -26,11 +26,12 @@ config SENSORS_PMBUS
           be called pmbus.
 
 config SENSORS_ADM1275
-        tristate "Analog Devices ADM1275"
+        tristate "Analog Devices ADM1275 and compatibles"
         default n
         help
           If you say yes here you get hardware monitoring support for Analog
-          Devices ADM1275 Hot-Swap Controller and Digital Power Monitor.
+          Devices ADM1275 and ADM1276 Hot-Swap Controller and Digital Power
+          Monitor.
 
           This driver can also be built as a module. If so, the module will
           be called adm1275.
diff --git a/drivers/hwmon/pmbus/adm1275.c b/drivers/hwmon/pmbus/adm1275.c
index 7a9f2d9dbba4..fa1811274c27 100644
--- a/drivers/hwmon/pmbus/adm1275.c
+++ b/drivers/hwmon/pmbus/adm1275.c
@@ -23,6 +23,8 @@
 #include <linux/i2c.h>
 #include "pmbus.h"
 
+enum chips { adm1275, adm1276 };
+
 #define ADM1275_PEAK_IOUT               0xd0
 #define ADM1275_PEAK_VIN                0xd1
 #define ADM1275_PEAK_VOUT               0xd2
@@ -36,9 +38,12 @@
 
 #define ADM1275_IOUT_WARN2_SELECT       (1 << 4)
 
+#define ADM1276_PEAK_PIN                0xda
+
 #define ADM1275_MFR_STATUS_IOUT_WARN2   (1 << 0)
 
 struct adm1275_data {
+        int id;
         bool have_oc_fault;
         struct pmbus_driver_info info;
 };
@@ -49,7 +54,7 @@ static int adm1275_read_word_data(struct i2c_client *client, int page, int reg)
 {
         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
         const struct adm1275_data *data = to_adm1275_data(info);
-        int ret;
+        int ret = 0;
 
         if (page)
                 return -ENXIO;
@@ -78,10 +83,20 @@ static int adm1275_read_word_data(struct i2c_client *client, int page, int reg)
         case PMBUS_VIRT_READ_VIN_MAX:
                 ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VIN);
                 break;
+        case PMBUS_VIRT_READ_PIN_MAX:
+                if (data->id != adm1276) {
+                        ret = -ENXIO;
+                        break;
+                }
+                ret = pmbus_read_word_data(client, 0, ADM1276_PEAK_PIN);
+                break;
         case PMBUS_VIRT_RESET_IOUT_HISTORY:
         case PMBUS_VIRT_RESET_VOUT_HISTORY:
         case PMBUS_VIRT_RESET_VIN_HISTORY:
-                ret = 0;
+                break;
+        case PMBUS_VIRT_RESET_PIN_HISTORY:
+                if (data->id != adm1276)
+                        ret = -ENXIO;
                 break;
         default:
                 ret = -ENODATA;
@@ -113,6 +128,9 @@ static int adm1275_write_word_data(struct i2c_client *client, int page, int reg,
         case PMBUS_VIRT_RESET_VIN_HISTORY:
                 ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VIN, 0);
                 break;
+        case PMBUS_VIRT_RESET_PIN_HISTORY:
+                ret = pmbus_write_word_data(client, 0, ADM1276_PEAK_PIN, 0);
+                break;
         default:
                 ret = -ENODATA;
                 break;
@@ -180,6 +198,7 @@ static int adm1275_probe(struct i2c_client *client,
                 goto err_mem;
         }
 
+        data->id = id->driver_data;
         info = &data->info;
 
         info->pages = 1;
@@ -214,10 +233,33 @@ static int adm1275_probe(struct i2c_client *client,
         if (device_config & ADM1275_IOUT_WARN2_SELECT)
                 data->have_oc_fault = true;
 
-        if (config & ADM1275_VIN_VOUT_SELECT)
-                info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
-        else
-                info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;
+        switch (id->driver_data) {
+        case adm1275:
+                if (config & ADM1275_VIN_VOUT_SELECT)
+                        info->func[0] |=
+                          PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
+                else
+                        info->func[0] |=
+                          PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;
+                break;
+        case adm1276:
+                info->format[PSC_POWER] = direct;
+                info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_PIN
+                  | PMBUS_HAVE_STATUS_INPUT;
+                if (config & ADM1275_VIN_VOUT_SELECT)
+                        info->func[0] |=
+                          PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
+                if (config & ADM1275_VRANGE) {
+                        info->m[PSC_POWER] = 6043;
+                        info->b[PSC_POWER] = 0;
+                        info->R[PSC_POWER] = -2;
+                } else {
+                        info->m[PSC_POWER] = 2115;
+                        info->b[PSC_POWER] = 0;
+                        info->R[PSC_POWER] = -1;
+                }
+                break;
+        }
 
         ret = pmbus_do_probe(client, id, info);
         if (ret)
@@ -240,7 +282,8 @@ static int adm1275_remove(struct i2c_client *client)
 }
 
 static const struct i2c_device_id adm1275_id[] = {
-        {"adm1275", 0},
+        { "adm1275", adm1275 },
+        { "adm1276", adm1276 },
         { }
 };
 MODULE_DEVICE_TABLE(i2c, adm1275_id);
@@ -265,7 +308,7 @@ static void __exit adm1275_exit(void)
 }
 
 MODULE_AUTHOR("Guenter Roeck");
-MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275");
+MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275 and compatibles");
 MODULE_LICENSE("GPL");
 module_init(adm1275_init);
 module_exit(adm1275_exit);