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>

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.

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.

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;
 
+	switch (id->driver_data) {
+	case adm1275:
 		if (config & ADM1275_VIN_VOUT_SELECT)
-		info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
+			info->func[0] |=
+			  PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 		else
-		info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;
+			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);