[PATCH 3/4] hwmon: (pmbus/acbel-crps) Add Acbel CRPS power supply driver

From: Lakshmi Yadlapati
Date: Wed Mar 15 2023 - 13:41:12 EST

Add the driver to support Acbel CRPS power supply.

Signed-off-by: Lakshmi Yadlapati <lakshmiy@xxxxxxxxxx>
---
drivers/hwmon/pmbus/Kconfig | 9 +
drivers/hwmon/pmbus/Makefile | 1 +
drivers/hwmon/pmbus/acbel-crps.c | 311 +++++++++++++++++++++++++++++++
3 files changed, 321 insertions(+)
create mode 100644 drivers/hwmon/pmbus/acbel-crps.c

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 59d9a7430499..9fe7ac94cfa2 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -27,6 +27,15 @@ config SENSORS_PMBUS
This driver can also be built as a module. If so, the module will
be called pmbus.

+config SENSORS_ACBEL_CRPS
+ tristate "ACBEL CRPS Power Supply"
+ help
+ If you say yes here you get hardware monitoring support for the ACBEL
+ CRPS power supply.
+
+ This driver can also be built as a module. If so, the module will
+ be called acbel-crps.
+
config SENSORS_ADM1266
tristate "Analog Devices ADM1266 Sequencer"
select CRC8
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 3ae019916267..39aef0cb9934 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -5,6 +5,7 @@

obj-$(CONFIG_PMBUS) += pmbus_core.o
obj-$(CONFIG_SENSORS_PMBUS) += pmbus.o
+obj-$(CONFIG_SENSORS_ACBEL_CRPS) += acbel-crps.o
obj-$(CONFIG_SENSORS_ADM1266) += adm1266.o
obj-$(CONFIG_SENSORS_ADM1275) += adm1275.o
obj-$(CONFIG_SENSORS_BEL_PFE) += bel-pfe.o
diff --git a/drivers/hwmon/pmbus/acbel-crps.c b/drivers/hwmon/pmbus/acbel-crps.c
new file mode 100644
index 000000000000..f7779f0fbb2d
--- /dev/null
+++ b/drivers/hwmon/pmbus/acbel-crps.c
@@ -0,0 +1,311 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright 2023 IBM Corp.
+ */
+
+#include <linux/debugfs.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/pmbus.h>
+#include <linux/hwmon-sysfs.h>
+#include "pmbus.h"
+
+#define CRPS_MFG_ID_CMD 0x99
+#define CRPS_MFG_MODEL_CMD 0x9A
+#define CRPS_MFG_REVISION_CMD 0x9B
+#define CRPS_MFG_LOCATION_CMD 0x9C
+#define CRPS_MFG_SERIAL_CMD 0x9E
+#define CRPS_CCIN_CMD CRPS_MFG_SERIAL_CMD
+
+/* STATUS_VOUT */
+#define CRPS_STATUS_UV_FAULT BIT(4)
+#define CRPS_STATUS_OV_FAULT BIT(7)
+
+/* STATUS_IOUT */
+#define CRPS_STATUS_OP_WARNING BIT(0)
+#define CRPS_STATUS_OP_FAULT BIT(1)
+#define CRPS_STATUS_OC_WARNING BIT(5)
+#define CRPS_STATUS_OC_FAULT BIT(7)
+
+/* STATUS_TEMP */
+#define CRPS_STATUS_OT_WARNING BIT(6)
+#define CRPS_STATUS_OT_FAULT BIT(7)
+
+/* STATUS_FAN12 */
+#define CRPS_FAN1_SPEED_OVERRIDE BIT(2)
+#define CRPS_FAN1_WARNING BIT(5)
+#define CRPS_FAN1_FAULT BIT(7)
+
+enum {
+ CRPS_DEBUGFS_MFG_ID,
+ CRPS_DEBUGFS_MFG_MODEL,
+ CRPS_DEBUGFS_MFG_REVISION,
+ CRPS_DEBUGFS_MFG_LOCATION,
+ CRPS_DEBUGFS_MFG_SERIAL,
+ CRPS_DEBUGFS_CCIN,
+ CRPS_DEBUGFS_NUM_ENTRIES
+};
+
+struct acbel_crps {
+ struct i2c_client *client;
+ int debugfs_entries[CRPS_DEBUGFS_NUM_ENTRIES];
+};
+
+static const struct i2c_device_id acbel_crps_id[] = {
+ { "acbel_crps" },
+ { }
+};
+#define to_psu(x, y) container_of((x), struct acbel_crps, debugfs_entries[(y)])
+
+static ssize_t acbel_crps_debugfs_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ u8 cmd;
+ int rc;
+ int *idxp = file->private_data;
+ int idx = *idxp;
+ struct acbel_crps *psu = to_psu(idxp, idx);
+ char data[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };
+
+ pmbus_set_page(psu->client, 0, 0xff);
+
+ switch (idx) {
+ case CRPS_DEBUGFS_MFG_ID:
+ cmd = CRPS_MFG_ID_CMD;
+ break;
+ case CRPS_DEBUGFS_MFG_MODEL:
+ cmd = CRPS_MFG_MODEL_CMD;
+ break;
+ case CRPS_DEBUGFS_MFG_REVISION:
+ cmd = CRPS_MFG_REVISION_CMD;
+ break;
+ case CRPS_DEBUGFS_MFG_LOCATION:
+ cmd = CRPS_MFG_LOCATION_CMD;
+ break;
+ case CRPS_DEBUGFS_MFG_SERIAL:
+ cmd = CRPS_MFG_SERIAL_CMD;
+ break;
+ case CRPS_DEBUGFS_CCIN:
+ cmd = CRPS_CCIN_CMD;
+ rc = i2c_smbus_read_block_data(psu->client, cmd, data);
+ if (rc < 0)
+ return rc;
+ data[4] = '\n';
+ data[5] = '\0';
+ rc = 6;
+ goto done;
+ default:
+ return -EINVAL;
+ }
+
+ rc = i2c_smbus_read_block_data(psu->client, cmd, data);
+ if (rc < 0)
+ return rc;
+ data[rc] = '\n';
+ rc += 2;
+done:
+ return simple_read_from_buffer(buf, count, ppos, data, rc);
+}
+
+static const struct file_operations acbel_crps_fops = {
+ .llseek = noop_llseek,
+ .read = acbel_crps_debugfs_read,
+ .open = simple_open,
+};
+
+static int acbel_crps_read_word_data(struct i2c_client *client, int page,
+ int phase, int reg)
+{
+ int ret = 0;
+
+ if (page > 0)
+ return -ENXIO;
+
+ switch (reg) {
+ case PMBUS_VOUT_OV_FAULT_LIMIT:
+ case PMBUS_VOUT_UV_FAULT_LIMIT:
+ case PMBUS_IOUT_OC_FAULT_LIMIT:
+ case PMBUS_IOUT_OC_WARN_LIMIT:
+ case PMBUS_OT_WARN_LIMIT:
+ case PMBUS_IIN_OC_FAULT_LIMIT:
+ case PMBUS_IIN_OC_WARN_LIMIT:
+ case PMBUS_POUT_OP_FAULT_LIMIT:
+ case PMBUS_POUT_OP_WARN_LIMIT:
+ case PMBUS_MFR_VIN_MIN:
+ case PMBUS_MFR_VIN_MAX:
+ case PMBUS_MFR_IIN_MAX:
+ case PMBUS_MFR_PIN_MAX:
+ case PMBUS_MFR_VOUT_MIN:
+ case PMBUS_MFR_VOUT_MAX:
+ case PMBUS_MFR_IOUT_MAX:
+ case PMBUS_MFR_POUT_MAX:
+ case PMBUS_PIN_OP_WARN_LIMIT:
+ case PMBUS_READ_VIN:
+ case PMBUS_READ_IIN:
+ case PMBUS_READ_VOUT:
+ case PMBUS_READ_IOUT:
+ case PMBUS_READ_TEMPERATURE_1:
+ case PMBUS_READ_TEMPERATURE_2:
+ case PMBUS_READ_TEMPERATURE_3:
+ case PMBUS_READ_FAN_SPEED_1:
+ case PMBUS_READ_POUT:
+ case PMBUS_READ_PIN:
+ ret = pmbus_read_word_data(client, page, 0xff, reg);
+ break;
+ default:
+ ret = -EOPNOTSUPP;
+ break;
+ }
+ return ret;
+}
+
+static int acbel_crps_read_byte_data(struct i2c_client *client, int page,
+ int reg)
+{
+ int ret = 0;
+ int mfg_status;
+
+ if (page >= 0) {
+ ret = pmbus_set_page(client, page, 0xff);
+ if (ret < 0)
+ return ret;
+ }
+
+ switch (reg) {
+ case PMBUS_STATUS_VOUT:
+ case PMBUS_STATUS_IOUT:
+ case PMBUS_STATUS_TEMPERATURE:
+ case PMBUS_STATUS_FAN_12:
+ mfg_status = pmbus_read_word_data(client, 0, 0xff,
+ PMBUS_STATUS_MFR_SPECIFIC);
+ if (mfg_status < 0)
+ return mfg_status;
+
+ if (reg == PMBUS_STATUS_VOUT) {
+ if (mfg_status & CRPS_STATUS_OV_FAULT)
+ ret |= PB_VOLTAGE_OV_FAULT;
+ else if (mfg_status & CRPS_STATUS_UV_FAULT)
+ ret |= PB_VOLTAGE_UV_FAULT;
+ } else if (reg == PMBUS_STATUS_IOUT) {
+ if (mfg_status & CRPS_STATUS_OC_FAULT)
+ ret |= PB_IOUT_OC_FAULT;
+ else if (mfg_status & CRPS_STATUS_OC_WARNING)
+ ret |= PB_IOUT_OC_WARNING;
+ else if (mfg_status & CRPS_STATUS_OP_FAULT)
+ ret |= PB_POUT_OP_FAULT;
+ else if (mfg_status & CRPS_STATUS_OP_WARNING)
+ ret |= PB_POUT_OP_WARNING;
+ } else if (reg == PMBUS_STATUS_TEMPERATURE) {
+ if (mfg_status & CRPS_STATUS_OT_FAULT)
+ ret |= PB_TEMP_OT_FAULT;
+ else if (mfg_status & CRPS_STATUS_OT_WARNING)
+ ret |= PB_TEMP_OT_WARNING;
+ } else if (reg == PMBUS_STATUS_FAN_12) {
+ if (mfg_status & CRPS_FAN1_FAULT)
+ ret |= PB_FAN_FAN1_FAULT;
+ else if (mfg_status & CRPS_FAN1_WARNING)
+ ret |= PB_FAN_FAN1_WARNING;
+ else if (mfg_status & CRPS_FAN1_SPEED_OVERRIDE)
+ ret |= PB_FAN_FAN1_SPEED_OVERRIDE;
+ }
+ break;
+ default:
+ ret = -ENODATA;
+ break;
+ }
+ return ret;
+}
+
+static struct pmbus_driver_info acbel_crps_info = {
+ .pages = 1,
+ .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN |
+ PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT |
+ PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
+ PMBUS_HAVE_FAN12 |
+ PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
+ PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_INPUT |
+ PMBUS_HAVE_STATUS_FAN12 | PMBUS_MFR_IIN_MAX,
+ .read_word_data = acbel_crps_read_word_data,
+ .read_byte_data = acbel_crps_read_byte_data,
+};
+
+
+static int acbel_crps_probe(struct i2c_client *client)
+{
+ struct dentry *acbel_crps_dir;
+ struct dentry *debugfs;
+ struct acbel_crps *psu;
+ int rc, i;
+
+ rc = pmbus_do_probe(client, &acbel_crps_info);
+ if (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)
+ return 0;
+
+ psu->client = client;
+
+ debugfs = pmbus_get_debugfs_dir(client);
+ if (!debugfs)
+ return 0;
+
+ acbel_crps_dir = debugfs_create_dir(client->name, debugfs);
+ if (!acbel_crps_dir)
+ return 0;
+
+ for (i = 0; i < CRPS_DEBUGFS_NUM_ENTRIES; ++i)
+ psu->debugfs_entries[i] = i;
+
+ debugfs_create_file("mfg_id", 0444, acbel_crps_dir,
+ &psu->debugfs_entries[CRPS_DEBUGFS_MFG_ID],
+ &acbel_crps_fops);
+
+ debugfs_create_file("part_number", 0444, acbel_crps_dir,
+ &psu->debugfs_entries[CRPS_DEBUGFS_MFG_MODEL],
+ &acbel_crps_fops);
+
+ debugfs_create_file("fw_version", 0444, acbel_crps_dir,
+ &psu->debugfs_entries[CRPS_DEBUGFS_MFG_REVISION],
+ &acbel_crps_fops);
+
+ debugfs_create_file("mfg_location", 0444, acbel_crps_dir,
+ &psu->debugfs_entries[CRPS_DEBUGFS_MFG_LOCATION],
+ &acbel_crps_fops);
+
+ debugfs_create_file("serial_number", 0444, acbel_crps_dir,
+ &psu->debugfs_entries[CRPS_DEBUGFS_MFG_SERIAL],
+ &acbel_crps_fops);
+
+ debugfs_create_file("ccin", 0444, acbel_crps_dir,
+ &psu->debugfs_entries[CRPS_DEBUGFS_CCIN],
+ &acbel_crps_fops);
+ return 0;
+}
+
+static const struct of_device_id acbel_crps_of_match[] = {
+ { .compatible = "acbel,crps"},
+ {}
+};
+MODULE_DEVICE_TABLE(of, acbel_crps_of_match);
+
+static struct i2c_driver acbel_crps_driver = {
+ .driver = {
+ .name = "acbel-crps",
+ .of_match_table = acbel_crps_of_match,
+ },
+ .probe_new = acbel_crps_probe,
+ .id_table = acbel_crps_id,
+};
+
+module_i2c_driver(acbel_crps_driver);
+
+MODULE_AUTHOR("Lakshmi Yadlapati");
+MODULE_DESCRIPTION("PMBus driver for AcBel Power System power supplies");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(PMBUS);
--
2.37.2