hwmon: (pmbus) Add support for Infineon Multi-phase xdpe122 family controllers

Add support for devices XDPE12254, XDPE12284.

All these device support two pages.
The below lists of VOUT_MODE command readout with their related VID
protocols, Digital to Analog Converter steps, supported by these
devices:
VR12.0 mode, 5-mV DAC - 0x01;
VR12.5 mode, 10-mV DAC - 0x02;
IMVP9 mode, 5-mV DAC - 0x03;
AMD mode 6.25mV - 0x10.

Signed-off-by: Vadim Pasternak <vadimp@mellanox.com>
Link: https://lore.kernel.org/r/20200113150841.17670-5-vadimp@mellanox.com
[groeck: Added missing break statement]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 212c4db..a9ea062 100644 (file)
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -237,6 +237,15 @@ config SENSORS_UCD9200
          This driver can also be built as a module. If so, the module will
          be called ucd9200.
 
+config SENSORS_XDPE122
+       tristate "Infineon XDPE122 family"
+       help
+         If you say yes here you get hardware monitoring support for Infineon
+         XDPE12254, XDPE12284, device.
+
+         This driver can also be built as a module. If so, the module will
+         be called xdpe12284.
+
 config SENSORS_ZL6100
        tristate "Intersil ZL6100 and compatibles"
        help

diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 722c4bc..5feb458 100644 (file)
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -27,4 +27,5 @@ obj-$(CONFIG_SENSORS_TPS40422)        += tps40422.o
 obj-$(CONFIG_SENSORS_TPS53679) += tps53679.o
 obj-$(CONFIG_SENSORS_UCD9000)  += ucd9000.o
 obj-$(CONFIG_SENSORS_UCD9200)  += ucd9200.o
+obj-$(CONFIG_SENSORS_XDPE122)  += xdpe12284.o
 obj-$(CONFIG_SENSORS_ZL6100)   += zl6100.o

diff --git a/drivers/hwmon/pmbus/xdpe12284.c b/drivers/hwmon/pmbus/xdpe12284.c
new file mode 100644 (file)
index 0000000..3d47806
--- /dev/null
+++ b/drivers/hwmon/pmbus/xdpe12284.c
@@ -0,0 +1,117 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Hardware monitoring driver for Infineon Multi-phase Digital VR Controllers
+ *
+ * Copyright (c) 2020 Mellanox Technologies. All rights reserved.
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include "pmbus.h"
+
+#define XDPE122_PROT_VR12_5MV          0x01 /* VR12.0 mode, 5-mV DAC */
+#define XDPE122_PROT_VR12_5_10MV       0x02 /* VR12.5 mode, 10-mV DAC */
+#define XDPE122_PROT_IMVP9_10MV                0x03 /* IMVP9 mode, 10-mV DAC */
+#define XDPE122_AMD_625MV              0x10 /* AMD mode 6.25mV */
+#define XDPE122_PAGE_NUM               2
+
+static int xdpe122_identify(struct i2c_client *client,
+                           struct pmbus_driver_info *info)
+{
+       u8 vout_params;
+       int i, ret;
+
+       for (i = 0; i < XDPE122_PAGE_NUM; i++) {
+               /* Read the register with VOUT scaling value.*/
+               ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE);
+               if (ret < 0)
+                       return ret;
+
+               vout_params = ret & GENMASK(4, 0);
+
+               switch (vout_params) {
+               case XDPE122_PROT_VR12_5_10MV:
+                       info->vrm_version[i] = vr13;
+                       break;
+               case XDPE122_PROT_VR12_5MV:
+                       info->vrm_version[i] = vr12;
+                       break;
+               case XDPE122_PROT_IMVP9_10MV:
+                       info->vrm_version[i] = imvp9;
+                       break;
+               case XDPE122_AMD_625MV:
+                       info->vrm_version[i] = amd625mv;
+                       break;
+               default:
+                       return -EINVAL;
+               }
+       }
+
+       return 0;
+}
+
+static struct pmbus_driver_info xdpe122_info = {
+       .pages = XDPE122_PAGE_NUM,
+       .format[PSC_VOLTAGE_IN] = linear,
+       .format[PSC_VOLTAGE_OUT] = vid,
+       .format[PSC_TEMPERATURE] = linear,
+       .format[PSC_CURRENT_IN] = linear,
+       .format[PSC_CURRENT_OUT] = linear,
+       .format[PSC_POWER] = linear,
+       .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
+               PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
+               PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
+               PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT,
+       .func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
+               PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
+               PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
+               PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT,
+       .identify = xdpe122_identify,
+};
+
+static int xdpe122_probe(struct i2c_client *client,
+                        const struct i2c_device_id *id)
+{
+       struct pmbus_driver_info *info;
+
+       info = devm_kmemdup(&client->dev, &xdpe122_info, sizeof(*info),
+                           GFP_KERNEL);
+       if (!info)
+               return -ENOMEM;
+
+       return pmbus_do_probe(client, id, info);
+}
+
+static const struct i2c_device_id xdpe122_id[] = {
+       {"xdpe12254", 0},
+       {"xdpe12284", 0},
+       {}
+};
+
+MODULE_DEVICE_TABLE(i2c, xdpe122_id);
+
+static const struct of_device_id __maybe_unused xdpe122_of_match[] = {
+       {.compatible = "infineon, xdpe12254"},
+       {.compatible = "infineon, xdpe12284"},
+       {}
+};
+MODULE_DEVICE_TABLE(of, xdpe122_of_match);
+
+static struct i2c_driver xdpe122_driver = {
+       .driver = {
+               .name = "xdpe12284",
+               .of_match_table = of_match_ptr(xdpe122_of_match),
+       },
+       .probe = xdpe122_probe,
+       .remove = pmbus_do_remove,
+       .id_table = xdpe122_id,
+};
+
+module_i2c_driver(xdpe122_driver);
+
+MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
+MODULE_DESCRIPTION("PMBus driver for Infineon XDPE122 family");
+MODULE_LICENSE("GPL");