hwmon: (pmbus) Add support for pli1209bc

PLI1209BC is a Digital Supervisor from Vicor Corporation.

Signed-off-by: Marcello Sylvester Bauer <sylv@sylv.io>
Link: https://lore.kernel.org/r/4e016e66275bc46c90974aec18b150c874e64787.1645435888.git.sylv@sylv.io
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

3 files changed, 125 insertions, 0 deletions

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index c73aa50c7615..f18f67a94697 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -317,6 +317,15 @@ config SENSORS_PIM4328
 	  This driver can also be built as a module. If so, the module will
 	  be called pim4328.
 
+config SENSORS_PLI1209BC
+	tristate "Vicor PLI1209BC"
+	help
+	  If you say yes here you get hardware monitoring support for Vicor
+	  PLI1209BC Digital Supervisor.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called pli1209bc.
+
 config SENSORS_PM6764TR
 	tristate "ST PM6764TR"
 	help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index e5935f70c9e0..a4a96ac71de7 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_SENSORS_MAX8688)	+= max8688.o
 obj-$(CONFIG_SENSORS_MP2888)	+= mp2888.o
 obj-$(CONFIG_SENSORS_MP2975)	+= mp2975.o
 obj-$(CONFIG_SENSORS_MP5023)	+= mp5023.o
+obj-$(CONFIG_SENSORS_PLI1209BC)	+= pli1209bc.o
 obj-$(CONFIG_SENSORS_PM6764TR)	+= pm6764tr.o
 obj-$(CONFIG_SENSORS_PXE1610)	+= pxe1610.o
 obj-$(CONFIG_SENSORS_Q54SJ108A2)	+= q54sj108a2.o
diff --git a/drivers/hwmon/pmbus/pli1209bc.c b/drivers/hwmon/pmbus/pli1209bc.c
new file mode 100644
index 000000000000..5f8847307e55
--- /dev/null
+++ b/drivers/hwmon/pmbus/pli1209bc.c
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hardware monitoring driver for Vicor PLI1209BC Digital Supervisor
+ *
+ * Copyright (c) 2022 9elements GmbH
+ */
+
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/pmbus.h>
+#include "pmbus.h"
+
+/*
+ * The capability command is only supported at page 0. Probing the device while
+ * the page register is set to 1 will falsely enable PEC support. Disable
+ * capability probing accordingly, since the PLI1209BC does not have any
+ * additional capabilities.
+ */
+static struct pmbus_platform_data pli1209bc_plat_data = {
+	.flags = PMBUS_NO_CAPABILITY,
+};
+
+static int pli1209bc_read_word_data(struct i2c_client *client, int page,
+				    int phase, int reg)
+{
+	int data;
+
+	switch (reg) {
+	/* PMBUS_READ_POUT uses a direct format with R=0 */
+	case PMBUS_READ_POUT:
+		data = pmbus_read_word_data(client, page, phase, reg);
+		if (data < 0)
+			return data;
+		data = sign_extend32(data, 15) * 10;
+		return clamp_val(data, -32768, 32767) & 0xffff;
+	default:
+		return -ENODATA;
+	}
+}
+
+static struct pmbus_driver_info pli1209bc_info = {
+	.pages = 2,
+	.format[PSC_VOLTAGE_IN] = direct,
+	.format[PSC_VOLTAGE_OUT] = direct,
+	.format[PSC_CURRENT_IN] = direct,
+	.format[PSC_CURRENT_OUT] = direct,
+	.format[PSC_POWER] = direct,
+	.format[PSC_TEMPERATURE] = direct,
+	.m[PSC_VOLTAGE_IN] = 1,
+	.b[PSC_VOLTAGE_IN] = 0,
+	.R[PSC_VOLTAGE_IN] = 1,
+	.m[PSC_VOLTAGE_OUT] = 1,
+	.b[PSC_VOLTAGE_OUT] = 0,
+	.R[PSC_VOLTAGE_OUT] = 1,
+	.m[PSC_CURRENT_IN] = 1,
+	.b[PSC_CURRENT_IN] = 0,
+	.R[PSC_CURRENT_IN] = 3,
+	.m[PSC_CURRENT_OUT] = 1,
+	.b[PSC_CURRENT_OUT] = 0,
+	.R[PSC_CURRENT_OUT] = 2,
+	.m[PSC_POWER] = 1,
+	.b[PSC_POWER] = 0,
+	.R[PSC_POWER] = 1,
+	.m[PSC_TEMPERATURE] = 1,
+	.b[PSC_TEMPERATURE] = 0,
+	.R[PSC_TEMPERATURE] = 0,
+	/*
+	 * Page 0 sums up all attributes except voltage readings.
+	 * The pli1209 digital supervisor only contains a single BCM, making
+	 * page 0 redundant.
+	 */
+	.func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT
+	    | PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT
+	    | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT
+	    | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
+	    | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT,
+	.read_word_data = pli1209bc_read_word_data,
+};
+
+static int pli1209bc_probe(struct i2c_client *client)
+{
+	client->dev.platform_data = &pli1209bc_plat_data;
+	return pmbus_do_probe(client, &pli1209bc_info);
+}
+
+static const struct i2c_device_id pli1209bc_id[] = {
+	{"pli1209bc", 0},
+	{}
+};
+
+MODULE_DEVICE_TABLE(i2c, pli1209bc_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id pli1209bc_of_match[] = {
+	{ .compatible = "vicor,pli1209bc" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, pli1209bc_of_match);
+#endif
+
+static struct i2c_driver pli1209bc_driver = {
+	.driver = {
+		   .name = "pli1209bc",
+		   .of_match_table = of_match_ptr(pli1209bc_of_match),
+		   },
+	.probe_new = pli1209bc_probe,
+	.id_table = pli1209bc_id,
+};
+
+module_i2c_driver(pli1209bc_driver);
+
+MODULE_AUTHOR("Marcello Sylvester Bauer <sylv@sylv.io>");
+MODULE_DESCRIPTION("PMBus driver for Vicor PLI1209BC");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(PMBUS);