hwmon: (pmbus) Add support for Infineon XDP710

Add support for Infineon XDP710.This is a Hot-Swap Controller.

Signed-off-by: Peter Yin <peteryin.openbmc@gmail.com>
Link: https://lore.kernel.org/r/20240425153608.4003782-2-peteryin.openbmc@gmail.com
[groeck: s/microOhmRsense/micro_ohm_osense/g; declared array static]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

5 files changed, 225 insertions, 0 deletions

diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
index 9a4fd576e6f6..03d313af469a 100644
--- a/Documentation/hwmon/index.rst
+++ b/Documentation/hwmon/index.rst
@@ -251,6 +251,7 @@ Hardware Monitoring Kernel Drivers
    wm831x
    wm8350
    xgene-hwmon
+   xdp710
    xdpe12284
    xdpe152c4
    zl6100
diff --git a/Documentation/hwmon/xdp710.rst b/Documentation/hwmon/xdp710.rst
new file mode 100644
index 000000000000..083891f27818
--- /dev/null
+++ b/Documentation/hwmon/xdp710.rst
@@ -0,0 +1,83 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Kernel driver xdp710
+====================
+
+Supported chips:
+
+  * Infineon XDP710
+
+    Prefix: 'xdp710'
+
+  * Datasheet
+
+    Publicly available at the Infineon website : https://www.infineon.com/dgdl/Infineon-XDP710-001-DataSheet-v01_00-EN.pdf?fileId=8ac78c8c8412f8d301848a5316290b97
+
+Author:
+
+	Peter Yin <peteryin.openbmc@gmail.com>
+
+Description
+-----------
+
+This driver implements support for Infineon XDP710 Hot-Swap Controller.
+
+Device compliant with:
+
+- PMBus rev 1.3 interface.
+
+Device supports direct and linear format for reading input voltage,
+output voltage, output current, input power and temperature.
+
+The driver exports the following attributes via the 'sysfs' files
+for input voltage:
+
+**in1_input**
+
+**in1_label**
+
+**in1_max**
+
+**in1_max_alarm**
+
+**in1_min**
+
+**in1_min_alarm**
+
+The driver provides the following attributes for output voltage:
+
+**in2_input**
+
+**in2_label**
+
+**in2_alarm**
+
+The driver provides the following attributes for output current:
+
+**curr1_input**
+
+**curr1_label**
+
+**curr1_alarm**
+
+**curr1_max**
+
+The driver provides the following attributes for input power:
+
+**power1_input**
+
+**power1_label**
+
+**power1_alarm**
+
+The driver provides the following attributes for temperature:
+
+**temp1_input**
+
+**temp1_max**
+
+**temp1_max_alarm**
+
+**temp1_crit**
+
+**temp1_crit_alarm**
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 2c727003433b..08e82c457356 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -521,6 +521,15 @@ config SENSORS_UCD9200
 	  This driver can also be built as a module. If so, the module will
 	  be called ucd9200.
 
+config SENSORS_XDP710
+	tristate "Infineon XDP710 family"
+	help
+	  If you say yes here you get hardware monitoring support for Infineon
+	  XDP710.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called xdp710.
+
 config SENSORS_XDPE152
 	tristate "Infineon XDPE152 family"
 	help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 95a8dea5e5ed..2279b3327bbf 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -52,6 +52,7 @@ obj-$(CONFIG_SENSORS_TPS53679)	+= tps53679.o
 obj-$(CONFIG_SENSORS_TPS546D24)	+= tps546d24.o
 obj-$(CONFIG_SENSORS_UCD9000)	+= ucd9000.o
 obj-$(CONFIG_SENSORS_UCD9200)	+= ucd9200.o
+obj-$(CONFIG_SENSORS_XDP710)	+= xdp710.o
 obj-$(CONFIG_SENSORS_XDPE122)	+= xdpe12284.o
 obj-$(CONFIG_SENSORS_XDPE152)	+= xdpe152c4.o
 obj-$(CONFIG_SENSORS_ZL6100)	+= zl6100.o
diff --git a/drivers/hwmon/pmbus/xdp710.c b/drivers/hwmon/pmbus/xdp710.c
new file mode 100644
index 000000000000..03a5b937c221
--- /dev/null
+++ b/drivers/hwmon/pmbus/xdp710.c
@@ -0,0 +1,131 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for Infineon XDP710 Hot-Swap Controller
+ */
+
+#include <linux/bitops.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include "pmbus.h"
+
+#define XDP710_REG_CFG		0xD3
+#define XDP710_V_SNS_CFG	0xD4
+#define XDP710_CS_RNG		0xD5
+
+/*
+ * The table to map configuration register values
+ * to sense resistor values
+ */
+static const int micro_ohm_rsense[] = {
+	200, 250, 300, 330, 400, 470, 500, 600,
+	670, 700, 750, 800, 900, 1000, 1100, 1200,
+	1250, 1300, 1400, 1500, 1600, 1700, 1800, 1900,
+	2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700,
+	2800, 3000, 3100, 3200, 3300, 3400, 3500, 3600,
+	3700, 3800, 3900, 4000, 4100, 4200, 4300, 4400,
+	4500, 4600, 4700, 4800, 4900, 5000, 5500, 6000,
+	6500, 7000, 7500, 8000, 8500, 9000, 9500, 10000
+};
+
+static struct pmbus_driver_info xdp710_info = {
+	.pages = 1,
+	.format[PSC_VOLTAGE_IN] = direct,
+	.format[PSC_VOLTAGE_OUT] = direct,
+	.format[PSC_CURRENT_OUT] = direct,
+	.format[PSC_POWER] = direct,
+	.format[PSC_TEMPERATURE] = direct,
+	.m[PSC_VOLTAGE_IN] = 4653,
+	.b[PSC_VOLTAGE_IN] = 0,
+	.R[PSC_VOLTAGE_IN] = -2,
+	.m[PSC_VOLTAGE_OUT] = 4653,
+	.b[PSC_VOLTAGE_OUT] = 0,
+	.R[PSC_VOLTAGE_OUT] = -2,
+	.m[PSC_CURRENT_OUT] = 23165,
+	.b[PSC_CURRENT_OUT] = 0,
+	.R[PSC_CURRENT_OUT] = -2,
+	.m[PSC_POWER] = 4211,
+	.b[PSC_POWER] = 0,
+	.R[PSC_POWER] = -2,
+	.m[PSC_TEMPERATURE] = 52,
+	.b[PSC_TEMPERATURE] = 14321,
+	.R[PSC_TEMPERATURE] = -1,
+	.func[0] =
+		PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_PIN |
+		PMBUS_HAVE_TEMP | PMBUS_HAVE_IOUT |
+		PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
+};
+
+static int xdp710_probe(struct i2c_client *client)
+{
+	struct pmbus_driver_info *info;
+	u8 cs_rng;
+	u8 vtlm_rng;
+	int rsense;
+	int ret;
+	int m = 0;
+
+	info = devm_kmemdup(&client->dev, &xdp710_info, sizeof(*info),
+			    GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	ret = i2c_smbus_read_word_data(client, XDP710_CS_RNG);
+	if (ret < 0) {
+		dev_err(&client->dev, "Can't get CS_RNG");
+		return ret;
+	}
+	cs_rng = (ret >> 6) & GENMASK(1, 0);
+
+	ret = i2c_smbus_read_word_data(client, XDP710_V_SNS_CFG);
+	if (ret < 0) {
+		dev_err(&client->dev, "Can't get V_SNS_CFG");
+		return ret;
+	}
+	vtlm_rng = ret & GENMASK(1, 0);
+
+	ret = i2c_smbus_read_word_data(client, XDP710_REG_CFG);
+	if (ret < 0) {
+		dev_err(&client->dev, "Can't get REG_CFG");
+		return ret;
+	}
+	ret &= GENMASK(5, 0);
+	rsense = micro_ohm_rsense[ret];
+
+	info->m[PSC_VOLTAGE_IN] <<= vtlm_rng;
+	info->m[PSC_VOLTAGE_OUT] <<= vtlm_rng;
+
+	m = info->m[PSC_CURRENT_OUT];
+	info->m[PSC_CURRENT_OUT] = DIV_ROUND_CLOSEST(m * rsense >> cs_rng, 1000);
+
+	m = info->m[PSC_POWER];
+	info->m[PSC_POWER] = DIV_ROUND_CLOSEST(m * rsense >> cs_rng, 1000);
+
+	return pmbus_do_probe(client, info);
+}
+
+static const struct of_device_id xdp710_of_match[] = {
+	{ .compatible = "infineon,xdp710" },
+	{}
+};
+
+static const struct i2c_device_id xdp710_id[] = {
+	{"xdp710", 0},
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, xdp710_id);
+
+static struct i2c_driver xdp710_driver = {
+	.driver = {
+		   .name = "xdp710",
+		   .of_match_table = xdp710_of_match,
+	},
+	.probe = xdp710_probe,
+	.id_table = xdp710_id,
+};
+module_i2c_driver(xdp710_driver);
+
+MODULE_AUTHOR("Peter Yin <peter.yin@quantatw.com>");
+MODULE_DESCRIPTION("PMBus driver for XDP710 HSC");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(PMBUS);