[PATCH v1 2/4] hwmon: (pmbus/crps) Add Intel CRPS185 power supply

Ninad Palsule
2024-12-12T21:50:14Z

Add the driver to monitor Intel common redundant power supply (crps185)
with hwmon over pmbus.

Signed-off-by: Ninad Palsule <ninad@linux.ibm.com>
---
Documentation/hwmon/crps.rst | 95 +++++++++++
MAINTAINERS | 7 +
drivers/hwmon/pmbus/Kconfig | 9 ++
drivers/hwmon/pmbus/Makefile | 1 +
drivers/hwmon/pmbus/crps.c | 299 +++++++++++++++++++++++++++++++++++
5 files changed, 411 insertions(+)
create mode 100644 Documentation/hwmon/crps.rst
create mode 100644 drivers/hwmon/pmbus/crps.c

diff --git a/Documentation/hwmon/crps.rst b/Documentation/hwmon/crps.rst
new file mode 100644
index 000000000000..81d5dfd68a46
--- /dev/null
+++ b/Documentation/hwmon/crps.rst
@@ -0,0 +1,95 @@
+.. SPDX-License-Identifier: GPL-2.0-or-later
+
+Kernel driver crps
+========================
+
+Supported chips:
+
+ * Intel CRPS185
+
+ Prefix: 'crps185'
+
+ Addresses scanned: -
+
+Authors:
+ Ninad Palsule <ninad@linux.ibm.com>
+
+
+Description
+-----------
+
+This driver implements support for Common Redundant Power supply with PMBus
+support.
+
+The driver is a client driver to the core PMBus driver.
+Please see Documentation/hwmon/pmbus.rst for details on PMBus client drivers.
+
+
+Usage Notes
+-----------
+
+This driver does not auto-detect devices. You will have to instantiate the
+devices explicitly. Please see Documentation/i2c/instantiating-devices.rst for
+details.
+
+
+Sysfs entries
+-------------
+
+======================= ======================================================
+curr1_label "iin"
+curr1_input Measured input current
+curr1_max Maximum input current
+curr1_max_alarm Input maximum current high alarm
+curr1_crit Critial high input current
+curr1_crit_alarm Input critical current high alarm
+curr1_rated_max Maximum rated input current
+
+curr2_label "iout1"
+curr2_input Measured output current
+curr2_max Maximum output current
+curr2_max_alarm Output maximum current high alarm
+curr2_crit Critial high output current
+curr2_crit_alarm Output critical current high alarm
+curr2_rated_max Maximum rated output current
+
+in1_label "vin"
+in1_input Measured input voltage
+in1_crit Critical input over voltage
+in1_crit_alarm Critical input over voltage alarm
+in1_max Maximum input over voltage
+in1_max_alarm Maximum input over voltage alarm
+in1_rated_min Minimum rated input voltage
+in1_rated_max Maximum rated input voltage
+
+in2_label "vout1"
+in2_input Measured input voltage
+in2_crit Critical input over voltage
+in2_crit_alarm Critical input over voltage alarm
+in2_lcrit Critical input under voltage fault
+in2_lcrit_alarm Critical input under voltage fault alarm
+in2_max Maximum input over voltage
+in2_max_alarm Maximum input over voltage alarm
+in2_min Minimum input under voltage warning
+in2_min_alarm Minimum input under voltage warning alarm
+in2_rated_min Minimum rated input voltage
+in2_rated_max Maximum rated input voltage
+
+power1_label "pin"
+power1_input Measured input power
+power1_alarm Input power high alarm
+power1_max Maximum input power
+power1_rated_max Maximum rated input power
+
+temp[1-2]_input Measured temperature
+temp[1-2]_crit Critical temperature
+temp[1-2]_crit_alarm Critical temperature alarm
+temp[1-2]_max Maximum temperature
+temp[1-2]_max_alarm Maximum temperature alarm
+temp[1-2]_rated_max Maximum rated temperature
+
+fan1_alarm Fan 1 warning.
+fan1_fault Fan 1 fault.
+fan1_input Fan 1 speed in RPM.
+fan1_target Fan 1 target.
+======================= ======================================================
diff --git a/MAINTAINERS b/MAINTAINERS
index 637ddd44245f..6b31d545f0f1 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6100,6 +6100,13 @@ L: linux-input@vger.kernel.org
S: Maintained
F: drivers/hid/hid-creative-sb0540.c

+CRPS COMMON REDUNDANT PSU DRIVER
+M: Ninad Palsule <ninad@linux.ibm.com>
+L: linux-hwmon@vger.kernel.org
+S: Maintained
+F: Documentation/hwmon/crps.rst
+F: drivers/hwmon/pmbus/crps.c
+
CRYPTO API
M: Herbert Xu <herbert@gondor.apana.org.au>
M: "David S. Miller" <davem@davemloft.net>
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 22418a05ced0..56c4eb4b846e 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -85,6 +85,15 @@ config SENSORS_BPA_RS600
This driver can also be built as a module. If so, the module will
be called bpa-rs600.

+config SENSORS_CRPS
+ tristate "Common Redundant Power Supply"
+ help
+ If you say yes here you get hardware monitoring support for the Common
+ Redundant Power Supply.
+
+ This driver can also be built as a module. If so, the module will
+ be called crps.
+
config SENSORS_DELTA_AHE50DC_FAN
tristate "Delta AHE-50DC fan control module"
help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 3d3183f8d2a7..c7eb7739b7f8 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -62,3 +62,4 @@ obj-$(CONFIG_SENSORS_XDPE122) += xdpe12284.o
obj-$(CONFIG_SENSORS_XDPE152) += xdpe152c4.o
obj-$(CONFIG_SENSORS_ZL6100) += zl6100.o
obj-$(CONFIG_SENSORS_PIM4328) += pim4328.o
+obj-$(CONFIG_SENSORS_CRPS) += crps.o
diff --git a/drivers/hwmon/pmbus/crps.c b/drivers/hwmon/pmbus/crps.c
new file mode 100644
index 000000000000..44d309f81803
--- /dev/null
+++ b/drivers/hwmon/pmbus/crps.c
@@ -0,0 +1,299 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright 2024 IBM Corp.
+ */
+
+#include <linux/debugfs.h>
+#include <linux/i2c.h>
+#include <linux/of.h>
+#include <linux/pmbus.h>
+
+#include "pmbus.h"
+
+/* Intel crps185 specific commands. */
+#define CRPS185_MFR_IOUT_MAX 0xA6
+#define CRPS185_MFR_POUT_MAX 0xA7
+
+enum {
+ CRPS_DEBUGFS_PMBUS_REVISION = 0,
+ CRPS_DEBUGFS_MAX_POWER_OUT,
+ CRPS_DEBUGFS_MAX_CURRENT_OUT,
+ CRPS_DEBUGFS_NUM_ENTRIES
+};
+
+enum models { crps185 = 1, crps_unknown };
+
+struct crps {
+ enum models version;
+ struct i2c_client *client;
+
+ int debugfs_entries[CRPS_DEBUGFS_NUM_ENTRIES];
+};
+
+#define to_psu(x, y) container_of((x), struct crps, debugfs_entries[(y)])
+
+static struct pmbus_platform_data crps_pdata = {
+ .flags = PMBUS_SKIP_STATUS_CHECK,
+};
+
+static const struct i2c_device_id crps_id[] = {
+ { "intel_crps185", crps185 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, crps_id);
+
+/*
+ * Convert linear format word to machine format. 11 LSB side bits are two's
+ * complement integer mantissa and 5 MSB side bits are two's complement
+ * exponent
+ */
+static int crps_convert_linear(int rc)
+{
+ s16 exponent;
+ s32 mantissa;
+ s64 val;
+
+ exponent = ((s16)rc) >> 11;
+ mantissa = ((s16)((rc & 0x7ff) << 5)) >> 5;
+
+ val = mantissa;
+ if (exponent >= 0)
+ val <<= exponent;
+ else
+ val >>= -exponent;
+
+ return (int)val;
+}
+
+static ssize_t crps_debugfs_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ int rc;
+ int *idxp = file->private_data;
+ int idx = *idxp;
+ struct crps *psu = to_psu(idxp, idx);
+ char data[2 * I2C_SMBUS_BLOCK_MAX] = { 0 };
+
+ rc = pmbus_lock_interruptible(psu->client);
+ if (rc)
+ return rc;
+
+ rc = pmbus_set_page(psu->client, 0, 0xff);
+ if (rc)
+ goto unlock;
+
+ switch (idx) {
+ case CRPS_DEBUGFS_PMBUS_REVISION:
+ rc = i2c_smbus_read_byte_data(psu->client, PMBUS_REVISION);
+ if (rc >= 0) {
+ if (psu->version == crps185) {
+ if (rc == 0)
+ rc = sprintf(data, "%s", "1.0");
+ else if (rc == 0x11)
+ rc = sprintf(data, "%s", "1.1");
+ else if (rc == 0x22)
+ rc = sprintf(data, "%s", "1.2");
+ else
+ rc = snprintf(data, 3, "0x%02x", rc);
+ } else {
+ rc = snprintf(data, 3, "%02x", rc);
+ }
+ }
+ break;
+ case CRPS_DEBUGFS_MAX_POWER_OUT:
+ rc = i2c_smbus_read_word_data(psu->client, PMBUS_MFR_POUT_MAX);
+ if (rc >= 0) {
+ rc = crps_convert_linear(rc);
+ rc = snprintf(data, I2C_SMBUS_BLOCK_MAX, "%d", rc);
+ }
+ break;
+ case CRPS_DEBUGFS_MAX_CURRENT_OUT:
+ rc = i2c_smbus_read_word_data(psu->client, PMBUS_MFR_IOUT_MAX);
+ if (rc >= 0) {
+ rc = crps_convert_linear(rc);
+ rc = snprintf(data, I2C_SMBUS_BLOCK_MAX, "%d", rc);
+ }
+ break;
+ default:
+ rc = -EINVAL;
+ break;
+ }
+
+unlock:
+ pmbus_unlock(psu->client);
+ if (rc < 0)
+ return rc;
+
+ data[rc] = '\n';
+ rc += 2;
+
+ return simple_read_from_buffer(buf, count, ppos, data, rc);
+}
+
+static const struct file_operations crps_debugfs_fops = {
+ .llseek = noop_llseek,
+ .read = crps_debugfs_read,
+ .open = simple_open,
+};
+
+static int crps_read_word_data(struct i2c_client *client, int page,
+ int phase, int reg)
+{
+ int rc;
+
+ switch (reg) {
+ case PMBUS_STATUS_WORD:
+ rc = pmbus_read_word_data(client, page, phase, reg);
+ if (rc < 0)
+ return rc;
+ break;
+ case PMBUS_OT_WARN_LIMIT:
+ rc = pmbus_read_word_data(client, page, phase,
+ PMBUS_MFR_MAX_TEMP_1);
+ if (rc < 0)
+ return rc;
+ break;
+ case PMBUS_IOUT_OC_WARN_LIMIT:
+ rc = pmbus_read_word_data(client, page, phase,
+ CRPS185_MFR_IOUT_MAX);
+ if (rc < 0)
+ return rc;
+ break;
+ case PMBUS_POUT_OP_WARN_LIMIT:
+ rc = pmbus_read_word_data(client, page, phase,
+ CRPS185_MFR_POUT_MAX);
+ if (rc < 0)
+ return rc;
+ break;
+ default:
+ rc = -ENODATA;
+ break;
+ }
+
+ return rc;
+}
+
+static struct pmbus_driver_info crps_info[] = {
+ [crps185] = {
+ .pages = 1,
+ /* PSU uses default linear data format. */
+ .func[0] = PMBUS_HAVE_PIN | PMBUS_HAVE_IOUT |
+ PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_IIN |
+ PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT |
+ PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
+ PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
+ PMBUS_HAVE_STATUS_TEMP |
+ PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12,
+ .read_word_data = crps_read_word_data,
+ },
+};
+
+#define to_psu(x, y) container_of((x), struct crps, debugfs_entries[(y)])
+
+static void crps_init_debugfs(struct crps *psu)
+{
+ struct i2c_client *client = psu->client;
+ struct dentry *debugfs;
+ int i;
+
+ /* Don't fail the probe if we can't create debugfs */
+ debugfs = pmbus_get_debugfs_dir(client);
+ if (!debugfs)
+ return;
+
+ for (i = 0; i < CRPS_DEBUGFS_NUM_ENTRIES; ++i)
+ psu->debugfs_entries[i] = i;
+
+ debugfs_create_file("pmbus_revision", 0444, debugfs,
+ &psu->debugfs_entries[CRPS_DEBUGFS_PMBUS_REVISION],
+ &crps_debugfs_fops);
+ debugfs_create_file("max_power_out", 0444, debugfs,
+ &psu->debugfs_entries[CRPS_DEBUGFS_MAX_POWER_OUT],
+ &crps_debugfs_fops);
+ debugfs_create_file("max_current_out", 0444, debugfs,
+ &psu->debugfs_entries[CRPS_DEBUGFS_MAX_CURRENT_OUT],
+ &crps_debugfs_fops);
+}
+
+static int crps_probe(struct i2c_client *client)
+{
+ int rc;
+ struct device *dev = &client->dev;
+ enum models vs = crps_unknown;
+ struct crps *psu;
+ const void *md = of_device_get_match_data(&client->dev);
+ const struct i2c_device_id *id = NULL;
+ char buf[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };
+
+ if (md) {
+ vs = (uintptr_t)md;
+ } else {
+ id = i2c_match_id(crps_id, client);
+ if (id)
+ vs = (enum models)id->driver_data;
+ }
+
+ if (!vs || vs >= crps_unknown) {
+ dev_err(dev, "Version %d not supported\n", vs);
+ return -EINVAL;
+ }
+
+ rc = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
+ if (rc < 0) {
+ dev_err(dev, "Failed to read PMBUS_MFR_MODEL\n");
+ return rc;
+ }
+ if (strncmp(buf, "03NK260", 7)) {
+ buf[rc] = '\0';
+ dev_err(dev, "Model '%s' not supported\n", buf);
+ return -ENODEV;
+ }
+
+ client->dev.platform_data = &crps_pdata;
+ rc = pmbus_do_probe(client, &crps_info[vs]);
+ if (rc) {
+ dev_err(dev, "Failed to probe %d\n", rc);
+ return rc;
+ }
+
+ /*
+ * Don't fail the probe if there isn't enough memory for debugfs.
+ */
+ psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL);
+ if (!psu) {
+ dev_warn(dev, "Failed to allocate memory. debugfs are not supported.\n");
+ return 0;
+ }
+
+ psu->version = vs;
+ psu->client = client;
+
+ crps_init_debugfs(psu);
+
+ return 0;
+}
+
+static const struct of_device_id crps_of_match[] = {
+ {
+ .compatible = "intel,crps185",
+ .data = (void *)crps185
+ },
+ {}
+};
+MODULE_DEVICE_TABLE(of, crps_of_match);
+
+static struct i2c_driver crps_driver = {
+ .driver = {
+ .name = "crps",
+ .of_match_table = crps_of_match,
+ },
+ .probe = crps_probe,
+ .id_table = crps_id,
+};
+
+module_i2c_driver(crps_driver);
+
+MODULE_AUTHOR("Ninad Palsule");
+MODULE_DESCRIPTION("PMBus driver for Common Redundant power supplies");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("PMBUS");
--
2.43.0