7 files changed, 519 insertions, 248 deletions

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 59d9a7430499..270b6336b76d 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_FSG032
+	tristate "ACBEL FSG032 Power Supply"
+	help
+	  If you say yes here you get hardware monitoring support for the ACBEL
+	  FSG032 Power Supply.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called acbel-fsg032.
+
 config SENSORS_ADM1266
 	tristate "Analog Devices ADM1266 Sequencer"
 	select CRC8
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 3ae019916267..84ee960a6c2d 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-$(CONFIG_SENSORS_ACBEL_FSG032) += acbel-fsg032.o
 obj-$(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-fsg032.c b/drivers/hwmon/pmbus/acbel-fsg032.c
new file mode 100644
index 000000000000..28a25f30e2cf
--- /dev/null
+++ b/drivers/hwmon/pmbus/acbel-fsg032.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright 2023 IBM Corp.
+ */
+
+#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"
+
+static const struct i2c_device_id acbel_fsg032_id[] = {
+	{ "acbel_fsg032" },
+	{}
+};
+
+static struct pmbus_driver_info acbel_fsg032_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,
+};
+
+static int acbel_fsg032_probe(struct i2c_client *client)
+{
+	u8 buf[I2C_SMBUS_BLOCK_MAX + 1];
+	struct device *dev = &client->dev;
+	int rc;
+
+	rc = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
+	if (rc < 0) {
+		dev_err(dev, "Failed to read PMBUS_MFR_ID\n");
+		return rc;
+	}
+	if (strncmp(buf, "ACBEL", 5)) {
+		buf[rc] = '\0';
+		dev_err(dev, "Manufacturer '%s' not supported\n", buf);
+		return -ENODEV;
+	}
+
+	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, "FSG032", 6)) {
+		buf[rc] = '\0';
+		dev_err(dev, "Model '%s' not supported\n", buf);
+		return -ENODEV;
+	}
+
+	rc = pmbus_do_probe(client, &acbel_fsg032_info);
+	if (rc)
+		return rc;
+
+	return 0;
+}
+
+static const struct of_device_id acbel_fsg032_of_match[] = {
+	{ .compatible = "acbel,fsg032" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, acbel_fsg032_of_match);
+
+static struct i2c_driver acbel_fsg032_driver = {
+	.driver = {
+		.name = "acbel-fsg032",
+		.of_match_table = acbel_fsg032_of_match,
+	},
+	.probe_new = acbel_fsg032_probe,
+	.id_table = acbel_fsg032_id,
+};
+
+module_i2c_driver(acbel_fsg032_driver);
+
+MODULE_AUTHOR("Lakshmi Yadlapati");
+MODULE_DESCRIPTION("PMBus driver for AcBel Power System power supplies");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(PMBUS);
diff --git a/drivers/hwmon/pmbus/fsp-3y.c b/drivers/hwmon/pmbus/fsp-3y.c
index aec294cc72d1..c7469d2cdedc 100644
--- a/drivers/hwmon/pmbus/fsp-3y.c
+++ b/drivers/hwmon/pmbus/fsp-3y.c
@@ -180,7 +180,6 @@ static struct pmbus_driver_info fsp3y_info[] = {
 			PMBUS_HAVE_FAN12,
 		.func[YM2151_PAGE_5VSB_LOG] =
 			PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT,
-			PMBUS_HAVE_IIN,
 		.read_word_data = fsp3y_read_word_data,
 		.read_byte_data = fsp3y_read_byte_data,
 	},
diff --git a/drivers/hwmon/pmbus/ibm-cffps.c b/drivers/hwmon/pmbus/ibm-cffps.c
index e3294a1a54bb..76e72e9acda7 100644
--- a/drivers/hwmon/pmbus/ibm-cffps.c
+++ b/drivers/hwmon/pmbus/ibm-cffps.c
@@ -18,12 +18,6 @@
 
 #include "pmbus.h"
 
-#define CFFPS_MFG_ID_CMD                        0x99
-#define CFFPS_FRU_CMD				0x9A
-#define CFFPS_PN_CMD				0x9B
-#define CFFPS_HEADER_CMD			0x9C
-#define CFFPS_SN_CMD				0x9E
-#define CFFPS_MAX_POWER_OUT_CMD			0xA7
 #define CFFPS_CCIN_CMD				0xBD
 #define CFFPS_FW_CMD				0xFA
 #define CFFPS1_FW_NUM_BYTES			4
@@ -32,7 +26,7 @@
 #define CFFPS_12VCS_VOUT_CMD			0xDE
 
 #define CFFPS_INPUT_HISTORY_CMD			0xD6
-#define CFFPS_INPUT_HISTORY_SIZE		100
+#define CFFPS_INPUT_HISTORY_SIZE		101
 
 #define CFFPS_CCIN_REVISION			GENMASK(7, 0)
 #define CFFPS_CCIN_REVISION_LEGACY		 0xde
@@ -57,13 +51,7 @@
 #define CFFPS_BLINK_RATE_MS			250
 
 enum {
-	CFFPS_DEBUGFS_INPUT_HISTORY = 0,
-	CFFPS_DEBUGFS_MFG_ID,
-	CFFPS_DEBUGFS_FRU,
-	CFFPS_DEBUGFS_PN,
-	CFFPS_DEBUGFS_HEADER,
-	CFFPS_DEBUGFS_SN,
-	CFFPS_DEBUGFS_MAX_POWER_OUT,
+	CFFPS_DEBUGFS_MAX_POWER_OUT = 0,
 	CFFPS_DEBUGFS_CCIN,
 	CFFPS_DEBUGFS_FW,
 	CFFPS_DEBUGFS_ON_OFF_CONFIG,
@@ -72,19 +60,11 @@ enum {
 
 enum versions { cffps1, cffps2, cffps_unknown };
 
-struct ibm_cffps_input_history {
-	struct mutex update_lock;
-	unsigned long last_update;
-
-	u8 byte_count;
-	u8 data[CFFPS_INPUT_HISTORY_SIZE];
-};
-
 struct ibm_cffps {
 	enum versions version;
 	struct i2c_client *client;
 
-	struct ibm_cffps_input_history input_history;
+	u8 input_history[CFFPS_INPUT_HISTORY_SIZE];
 
 	int debugfs_entries[CFFPS_DEBUGFS_NUM_ENTRIES];
 
@@ -93,118 +73,98 @@ struct ibm_cffps {
 	struct led_classdev led;
 };
 
-static const struct i2c_device_id ibm_cffps_id[];
-
 #define to_psu(x, y) container_of((x), struct ibm_cffps, debugfs_entries[(y)])
 
-static ssize_t ibm_cffps_read_input_history(struct ibm_cffps *psu,
-					    char __user *buf, size_t count,
-					    loff_t *ppos)
+static ssize_t ibm_cffps_debugfs_read_input_history(struct file *file, char __user *buf,
+						    size_t count, loff_t *ppos)
 {
 	int rc;
-	u8 msgbuf0[1] = { CFFPS_INPUT_HISTORY_CMD };
-	u8 msgbuf1[CFFPS_INPUT_HISTORY_SIZE + 1] = { 0 };
+	u8 cmd = CFFPS_INPUT_HISTORY_CMD;
+	struct ibm_cffps *psu = file->private_data;
 	struct i2c_msg msg[2] = {
 		{
 			.addr = psu->client->addr,
 			.flags = psu->client->flags,
 			.len = 1,
-			.buf = msgbuf0,
+			.buf = &cmd,
 		}, {
 			.addr = psu->client->addr,
 			.flags = psu->client->flags | I2C_M_RD,
-			.len = CFFPS_INPUT_HISTORY_SIZE + 1,
-			.buf = msgbuf1,
+			.len = CFFPS_INPUT_HISTORY_SIZE,
+			.buf = psu->input_history,
 		},
 	};
 
 	if (!*ppos) {
-		mutex_lock(&psu->input_history.update_lock);
-		if (time_after(jiffies, psu->input_history.last_update + HZ)) {
-			/*
-			 * Use a raw i2c transfer, since we need more bytes
-			 * than Linux I2C supports through smbus xfr (only 32).
-			 */
-			rc = i2c_transfer(psu->client->adapter, msg, 2);
-			if (rc < 0) {
-				mutex_unlock(&psu->input_history.update_lock);
-				return rc;
-			}
+		rc = pmbus_lock_interruptible(psu->client);
+		if (rc)
+			return rc;
 
-			psu->input_history.byte_count = msgbuf1[0];
-			memcpy(psu->input_history.data, &msgbuf1[1],
-			       CFFPS_INPUT_HISTORY_SIZE);
-			psu->input_history.last_update = jiffies;
+		rc = pmbus_set_page(psu->client, 0, 0xff);
+		if (rc) {
+			pmbus_unlock(psu->client);
+			return rc;
 		}
 
-		mutex_unlock(&psu->input_history.update_lock);
+		/*
+		 * Use a raw i2c transfer, since we need more bytes
+		 * than Linux I2C supports through smbus xfr (only 32).
+		 */
+		rc = i2c_transfer(psu->client->adapter, msg, 2);
+		pmbus_unlock(psu->client);
+		if (rc < 0)
+			return rc;
 	}
 
 	return simple_read_from_buffer(buf, count, ppos,
-				       psu->input_history.data,
-				       psu->input_history.byte_count);
+				       psu->input_history + 1,
+				       psu->input_history[0]);
 }
 
+static const struct file_operations ibm_cffps_input_history_fops = {
+	.llseek = noop_llseek,
+	.read = ibm_cffps_debugfs_read_input_history,
+	.open = simple_open,
+};
+
 static ssize_t ibm_cffps_debugfs_read(struct file *file, char __user *buf,
 				      size_t count, loff_t *ppos)
 {
-	u8 cmd;
 	int i, rc;
 	int *idxp = file->private_data;
 	int idx = *idxp;
 	struct ibm_cffps *psu = to_psu(idxp, idx);
 	char data[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };
 
-	pmbus_set_page(psu->client, 0, 0xff);
+	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 CFFPS_DEBUGFS_INPUT_HISTORY:
-		return ibm_cffps_read_input_history(psu, buf, count, ppos);
-	case CFFPS_DEBUGFS_MFG_ID:
-		cmd = CFFPS_MFG_ID_CMD;
-		break;
-	case CFFPS_DEBUGFS_FRU:
-		cmd = CFFPS_FRU_CMD;
-		break;
-	case CFFPS_DEBUGFS_PN:
-		cmd = CFFPS_PN_CMD;
-		break;
-	case CFFPS_DEBUGFS_HEADER:
-		cmd = CFFPS_HEADER_CMD;
-		break;
-	case CFFPS_DEBUGFS_SN:
-		cmd = CFFPS_SN_CMD;
-		break;
 	case CFFPS_DEBUGFS_MAX_POWER_OUT:
-		if (psu->version == cffps1) {
-			rc = i2c_smbus_read_word_swapped(psu->client,
-					CFFPS_MAX_POWER_OUT_CMD);
-		} else {
-			rc = i2c_smbus_read_word_data(psu->client,
-					CFFPS_MAX_POWER_OUT_CMD);
-		}
-
-		if (rc < 0)
-			return rc;
-
-		rc = snprintf(data, I2C_SMBUS_BLOCK_MAX, "%d", rc);
-		goto done;
+		if (psu->version == cffps1)
+			rc = i2c_smbus_read_word_swapped(psu->client, PMBUS_MFR_POUT_MAX);
+		else
+			rc = i2c_smbus_read_word_data(psu->client, PMBUS_MFR_POUT_MAX);
+		if (rc >= 0)
+			rc = snprintf(data, I2C_SMBUS_BLOCK_MAX, "%d", rc);
+		break;
 	case CFFPS_DEBUGFS_CCIN:
 		rc = i2c_smbus_read_word_swapped(psu->client, CFFPS_CCIN_CMD);
-		if (rc < 0)
-			return rc;
-
-		rc = snprintf(data, 5, "%04X", rc);
-		goto done;
+		if (rc >= 0)
+			rc = snprintf(data, 5, "%04X", rc);
+		break;
 	case CFFPS_DEBUGFS_FW:
 		switch (psu->version) {
 		case cffps1:
 			for (i = 0; i < CFFPS1_FW_NUM_BYTES; ++i) {
-				rc = i2c_smbus_read_byte_data(psu->client,
-							      CFFPS_FW_CMD +
-								i);
+				rc = i2c_smbus_read_byte_data(psu->client, CFFPS_FW_CMD + i);
 				if (rc < 0)
-					return rc;
+					goto unlock;
 
 				snprintf(&data[i * 2], 3, "%02X", rc);
 			}
@@ -213,11 +173,9 @@ static ssize_t ibm_cffps_debugfs_read(struct file *file, char __user *buf,
 			break;
 		case cffps2:
 			for (i = 0; i < CFFPS2_FW_NUM_WORDS; ++i) {
-				rc = i2c_smbus_read_word_data(psu->client,
-							      CFFPS_FW_CMD +
-								i);
+				rc = i2c_smbus_read_word_data(psu->client, CFFPS_FW_CMD + i);
 				if (rc < 0)
-					return rc;
+					goto unlock;
 
 				snprintf(&data[i * 4], 5, "%04X", rc);
 			}
@@ -225,26 +183,25 @@ static ssize_t ibm_cffps_debugfs_read(struct file *file, char __user *buf,
 			rc = i * 4;
 			break;
 		default:
-			return -EOPNOTSUPP;
+			rc = -EOPNOTSUPP;
+			break;
 		}
-		goto done;
+		break;
 	case CFFPS_DEBUGFS_ON_OFF_CONFIG:
-		rc = i2c_smbus_read_byte_data(psu->client,
-					      PMBUS_ON_OFF_CONFIG);
-		if (rc < 0)
-			return rc;
-
-		rc = snprintf(data, 3, "%02x", rc);
-		goto done;
+		rc = i2c_smbus_read_byte_data(psu->client, PMBUS_ON_OFF_CONFIG);
+		if (rc >= 0)
+			rc = snprintf(data, 3, "%02x", rc);
+		break;
 	default:
-		return -EINVAL;
+		rc = -EINVAL;
+		break;
 	}
 
-	rc = i2c_smbus_read_block_data(psu->client, cmd, data);
+unlock:
+	pmbus_unlock(psu->client);
 	if (rc < 0)
 		return rc;
 
-done:
 	data[rc] = '\n';
 	rc += 2;
 
@@ -263,14 +220,22 @@ static ssize_t ibm_cffps_debugfs_write(struct file *file,
 
 	switch (idx) {
 	case CFFPS_DEBUGFS_ON_OFF_CONFIG:
-		pmbus_set_page(psu->client, 0, 0xff);
-
 		rc = simple_write_to_buffer(&data, 1, ppos, buf, count);
 		if (rc <= 0)
 			return rc;
 
-		rc = i2c_smbus_write_byte_data(psu->client,
-					       PMBUS_ON_OFF_CONFIG, data);
+		rc = pmbus_lock_interruptible(psu->client);
+		if (rc)
+			return rc;
+
+		rc = pmbus_set_page(psu->client, 0, 0xff);
+		if (rc) {
+			pmbus_unlock(psu->client);
+			return rc;
+		}
+
+		rc = i2c_smbus_write_byte_data(psu->client, PMBUS_ON_OFF_CONFIG, data);
+		pmbus_unlock(psu->client);
 		if (rc)
 			return rc;
 
@@ -396,10 +361,19 @@ static int ibm_cffps_led_brightness_set(struct led_classdev *led_cdev,
 	dev_dbg(&psu->client->dev, "LED brightness set: %d. Command: %d.\n",
 		brightness, next_led_state);
 
-	pmbus_set_page(psu->client, 0, 0xff);
+	rc = pmbus_lock_interruptible(psu->client);
+	if (rc)
+		return rc;
+
+	rc = pmbus_set_page(psu->client, 0, 0xff);
+	if (rc) {
+		pmbus_unlock(psu->client);
+		return rc;
+	}
 
 	rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
 				       next_led_state);
+	pmbus_unlock(psu->client);
 	if (rc < 0)
 		return rc;
 
@@ -418,10 +392,19 @@ static int ibm_cffps_led_blink_set(struct led_classdev *led_cdev,
 
 	dev_dbg(&psu->client->dev, "LED blink set.\n");
 
-	pmbus_set_page(psu->client, 0, 0xff);
+	rc = pmbus_lock_interruptible(psu->client);
+	if (rc)
+		return rc;
+
+	rc = pmbus_set_page(psu->client, 0, 0xff);
+	if (rc) {
+		pmbus_unlock(psu->client);
+		return rc;
+	}
 
 	rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
 				       CFFPS_LED_BLINK);
+	pmbus_unlock(psu->client);
 	if (rc < 0)
 		return rc;
 
@@ -474,9 +457,11 @@ static struct pmbus_driver_info ibm_cffps_info[] = {
 			PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
 			PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP |
 			PMBUS_HAVE_STATUS_FAN12 | PMBUS_HAVE_VMON,
-		.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
-			PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
-			PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT,
+		.func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
+			PMBUS_HAVE_PIN | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
+			PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_VOUT |
+			PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT |
+			PMBUS_HAVE_STATUS_TEMP,
 		.read_byte_data = ibm_cffps_read_byte_data,
 		.read_word_data = ibm_cffps_read_word_data,
 	},
@@ -486,12 +471,19 @@ static struct pmbus_platform_data ibm_cffps_pdata = {
 	.flags = PMBUS_SKIP_STATUS_CHECK | PMBUS_NO_CAPABILITY,
 };
 
+static const struct i2c_device_id ibm_cffps_id[] = {
+	{ "ibm_cffps1", cffps1 },
+	{ "ibm_cffps2", cffps2 },
+	{ "ibm_cffps", cffps_unknown },
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, ibm_cffps_id);
+
 static int ibm_cffps_probe(struct i2c_client *client)
 {
 	int i, rc;
 	enum versions vs = cffps_unknown;
 	struct dentry *debugfs;
-	struct dentry *ibm_cffps_dir;
 	struct ibm_cffps *psu;
 	const void *md = of_device_get_match_data(&client->dev);
 	const struct i2c_device_id *id;
@@ -560,8 +552,6 @@ static int ibm_cffps_probe(struct i2c_client *client)
 
 	psu->version = vs;
 	psu->client = client;
-	mutex_init(&psu->input_history.update_lock);
-	psu->input_history.last_update = jiffies - HZ;
 
 	ibm_cffps_create_led_class(psu);
 
@@ -570,55 +560,29 @@ static int ibm_cffps_probe(struct i2c_client *client)
 	if (!debugfs)
 		return 0;
 
-	ibm_cffps_dir = debugfs_create_dir(client->name, debugfs);
-	if (!ibm_cffps_dir)
-		return 0;
-
 	for (i = 0; i < CFFPS_DEBUGFS_NUM_ENTRIES; ++i)
 		psu->debugfs_entries[i] = i;
 
-	debugfs_create_file("input_history", 0444, ibm_cffps_dir,
-			    &psu->debugfs_entries[CFFPS_DEBUGFS_INPUT_HISTORY],
-			    &ibm_cffps_fops);
-	debugfs_create_file("mfg_id", 0444, ibm_cffps_dir,
-			    &psu->debugfs_entries[CFFPS_DEBUGFS_MFG_ID],
-			    &ibm_cffps_fops);
-	debugfs_create_file("fru", 0444, ibm_cffps_dir,
-			    &psu->debugfs_entries[CFFPS_DEBUGFS_FRU],
-			    &ibm_cffps_fops);
-	debugfs_create_file("part_number", 0444, ibm_cffps_dir,
-			    &psu->debugfs_entries[CFFPS_DEBUGFS_PN],
-			    &ibm_cffps_fops);
-	debugfs_create_file("header", 0444, ibm_cffps_dir,
-			    &psu->debugfs_entries[CFFPS_DEBUGFS_HEADER],
-			    &ibm_cffps_fops);
-	debugfs_create_file("serial_number", 0444, ibm_cffps_dir,
-			    &psu->debugfs_entries[CFFPS_DEBUGFS_SN],
-			    &ibm_cffps_fops);
-	debugfs_create_file("max_power_out", 0444, ibm_cffps_dir,
+	debugfs_create_file("input_history", 0444, debugfs, psu, &ibm_cffps_input_history_fops);
+	debugfs_create_file("max_power_out", 0444, debugfs,
 			    &psu->debugfs_entries[CFFPS_DEBUGFS_MAX_POWER_OUT],
 			    &ibm_cffps_fops);
-	debugfs_create_file("ccin", 0444, ibm_cffps_dir,
+	debugfs_create_file("ccin", 0444, debugfs,
 			    &psu->debugfs_entries[CFFPS_DEBUGFS_CCIN],
 			    &ibm_cffps_fops);
-	debugfs_create_file("fw_version", 0444, ibm_cffps_dir,
+	debugfs_create_file("fw_version", 0444, debugfs,
 			    &psu->debugfs_entries[CFFPS_DEBUGFS_FW],
 			    &ibm_cffps_fops);
-	debugfs_create_file("on_off_config", 0644, ibm_cffps_dir,
+	debugfs_create_file("on_off_config", 0644, debugfs,
 			    &psu->debugfs_entries[CFFPS_DEBUGFS_ON_OFF_CONFIG],
 			    &ibm_cffps_fops);
 
+	/* For compatibility with users of the old naming scheme. */
+	debugfs_create_symlink(client->name, debugfs, ".");
+
 	return 0;
 }
 
-static const struct i2c_device_id ibm_cffps_id[] = {
-	{ "ibm_cffps1", cffps1 },
-	{ "ibm_cffps2", cffps2 },
-	{ "ibm_cffps", cffps_unknown },
-	{}
-};
-MODULE_DEVICE_TABLE(i2c, ibm_cffps_id);
-
 static const struct of_device_id ibm_cffps_of_match[] = {
 	{
 		.compatible = "ibm,cffps1",
diff --git a/drivers/hwmon/pmbus/pmbus.h b/drivers/hwmon/pmbus/pmbus.h
index 713ea7915425..b0832a4c690d 100644
--- a/drivers/hwmon/pmbus/pmbus.h
+++ b/drivers/hwmon/pmbus/pmbus.h
@@ -26,7 +26,7 @@ enum pmbus_regs {
 
 	PMBUS_CAPABILITY		= 0x19,
 	PMBUS_QUERY			= 0x1A,
-
+	PMBUS_SMBALERT_MASK		= 0x1B,
 	PMBUS_VOUT_MODE			= 0x20,
 	PMBUS_VOUT_COMMAND		= 0x21,
 	PMBUS_VOUT_TRIM			= 0x22,
@@ -505,6 +505,8 @@ int pmbus_get_fan_rate_device(struct i2c_client *client, int page, int id,
 			      enum pmbus_fan_mode mode);
 int pmbus_get_fan_rate_cached(struct i2c_client *client, int page, int id,
 			      enum pmbus_fan_mode mode);
+int pmbus_lock_interruptible(struct i2c_client *client);
+void pmbus_unlock(struct i2c_client *client);
 int pmbus_update_fan(struct i2c_client *client, int page, int id,
 		     u8 config, u8 mask, u16 command);
 struct dentry *pmbus_get_debugfs_dir(struct i2c_client *client);
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index 95e95783972a..9d14954da94f 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -81,6 +81,7 @@ struct pmbus_label {
 struct pmbus_data {
 	struct device *dev;
 	struct device *hwmon_dev;
+	struct regulator_dev **rdevs;
 
 	u32 flags;		/* from platform data */
 
@@ -1272,7 +1273,7 @@ struct pmbus_thermal_data {
 
 static int pmbus_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
 {
-	struct pmbus_thermal_data *tdata = tz->devdata;
+	struct pmbus_thermal_data *tdata = thermal_zone_device_priv(tz);
 	struct pmbus_sensor *sensor = tdata->sensor;
 	struct pmbus_data *pmbus_data = tdata->pmbus_data;
 	struct i2c_client *client = to_i2c_client(pmbus_data->dev);
@@ -2692,18 +2693,64 @@ static int pmbus_init_common(struct i2c_client *client, struct pmbus_data *data,
 	return 0;
 }
 
-#if IS_ENABLED(CONFIG_REGULATOR)
-static int pmbus_regulator_is_enabled(struct regulator_dev *rdev)
+/* A PMBus status flag and the corresponding REGULATOR_ERROR_* and REGULATOR_EVENTS_* flag */
+struct pmbus_status_assoc {
+	int pflag, rflag, eflag;
+};
+
+/* PMBus->regulator bit mappings for a PMBus status register */
+struct pmbus_status_category {
+	int func;
+	int reg;
+	const struct pmbus_status_assoc *bits; /* zero-terminated */
+};
+
+static const struct pmbus_status_category __maybe_unused pmbus_status_flag_map[] = {
+	{
+		.func = PMBUS_HAVE_STATUS_VOUT,
+		.reg = PMBUS_STATUS_VOUT,
+		.bits = (const struct pmbus_status_assoc[]) {
+			{ PB_VOLTAGE_UV_WARNING, REGULATOR_ERROR_UNDER_VOLTAGE_WARN,
+			REGULATOR_EVENT_UNDER_VOLTAGE_WARN },
+			{ PB_VOLTAGE_UV_FAULT,   REGULATOR_ERROR_UNDER_VOLTAGE,
+			REGULATOR_EVENT_UNDER_VOLTAGE },
+			{ PB_VOLTAGE_OV_WARNING, REGULATOR_ERROR_OVER_VOLTAGE_WARN,
+			REGULATOR_EVENT_OVER_VOLTAGE_WARN },
+			{ PB_VOLTAGE_OV_FAULT,   REGULATOR_ERROR_REGULATION_OUT,
+			REGULATOR_EVENT_OVER_VOLTAGE_WARN },
+			{ },
+		},
+	}, {
+		.func = PMBUS_HAVE_STATUS_IOUT,
+		.reg = PMBUS_STATUS_IOUT,
+		.bits = (const struct pmbus_status_assoc[]) {
+			{ PB_IOUT_OC_WARNING,   REGULATOR_ERROR_OVER_CURRENT_WARN,
+			REGULATOR_EVENT_OVER_CURRENT_WARN },
+			{ PB_IOUT_OC_FAULT,     REGULATOR_ERROR_OVER_CURRENT,
+			REGULATOR_EVENT_OVER_CURRENT },
+			{ PB_IOUT_OC_LV_FAULT,  REGULATOR_ERROR_OVER_CURRENT,
+			REGULATOR_EVENT_OVER_CURRENT },
+			{ },
+		},
+	}, {
+		.func = PMBUS_HAVE_STATUS_TEMP,
+		.reg = PMBUS_STATUS_TEMPERATURE,
+		.bits = (const struct pmbus_status_assoc[]) {
+			{ PB_TEMP_OT_WARNING,    REGULATOR_ERROR_OVER_TEMP_WARN,
+			REGULATOR_EVENT_OVER_TEMP_WARN },
+			{ PB_TEMP_OT_FAULT,      REGULATOR_ERROR_OVER_TEMP,
+			REGULATOR_EVENT_OVER_TEMP },
+			{ },
+		},
+	},
+};
+
+static int _pmbus_is_enabled(struct device *dev, u8 page)
 {
-	struct device *dev = rdev_get_dev(rdev);
 	struct i2c_client *client = to_i2c_client(dev->parent);
-	struct pmbus_data *data = i2c_get_clientdata(client);
-	u8 page = rdev_get_id(rdev);
 	int ret;
 
-	mutex_lock(&data->update_lock);
 	ret = _pmbus_read_byte_data(client, page, PMBUS_OPERATION);
-	mutex_unlock(&data->update_lock);
 
 	if (ret < 0)
 		return ret;
@@ -2711,106 +2758,77 @@ static int pmbus_regulator_is_enabled(struct regulator_dev *rdev)
 	return !!(ret & PB_OPERATION_CONTROL_ON);
 }
 
-static int _pmbus_regulator_on_off(struct regulator_dev *rdev, bool enable)
+static int __maybe_unused pmbus_is_enabled(struct device *dev, u8 page)
 {
-	struct device *dev = rdev_get_dev(rdev);
 	struct i2c_client *client = to_i2c_client(dev->parent);
 	struct pmbus_data *data = i2c_get_clientdata(client);
-	u8 page = rdev_get_id(rdev);
 	int ret;
 
 	mutex_lock(&data->update_lock);
-	ret = pmbus_update_byte_data(client, page, PMBUS_OPERATION,
-				     PB_OPERATION_CONTROL_ON,
-				     enable ? PB_OPERATION_CONTROL_ON : 0);
+	ret = _pmbus_is_enabled(dev, page);
 	mutex_unlock(&data->update_lock);
 
-	return ret;
+	return !!(ret & PB_OPERATION_CONTROL_ON);
 }
 
-static int pmbus_regulator_enable(struct regulator_dev *rdev)
-{
-	return _pmbus_regulator_on_off(rdev, 1);
-}
+#define to_dev_attr(_dev_attr) \
+	container_of(_dev_attr, struct device_attribute, attr)
 
-static int pmbus_regulator_disable(struct regulator_dev *rdev)
+static void pmbus_notify(struct pmbus_data *data, int page, int reg, int flags)
 {
-	return _pmbus_regulator_on_off(rdev, 0);
-}
-
-/* A PMBus status flag and the corresponding REGULATOR_ERROR_* flag */
-struct pmbus_regulator_status_assoc {
-	int pflag, rflag;
-};
+	int i;
 
-/* PMBus->regulator bit mappings for a PMBus status register */
-struct pmbus_regulator_status_category {
-	int func;
-	int reg;
-	const struct pmbus_regulator_status_assoc *bits; /* zero-terminated */
-};
+	for (i = 0; i < data->num_attributes; i++) {
+		struct device_attribute *da = to_dev_attr(data->group.attrs[i]);
+		struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+		int index = attr->index;
+		u16 smask = pb_index_to_mask(index);
+		u8 spage = pb_index_to_page(index);
+		u16 sreg = pb_index_to_reg(index);
+
+		if (reg == sreg && page == spage && (smask & flags)) {
+			dev_dbg(data->dev, "sysfs notify: %s", da->attr.name);
+			sysfs_notify(&data->dev->kobj, NULL, da->attr.name);
+			kobject_uevent(&data->dev->kobj, KOBJ_CHANGE);
+			flags &= ~smask;
+		}
 
-static const struct pmbus_regulator_status_category pmbus_regulator_flag_map[] = {
-	{
-		.func = PMBUS_HAVE_STATUS_VOUT,
-		.reg = PMBUS_STATUS_VOUT,
-		.bits = (const struct pmbus_regulator_status_assoc[]) {
-			{ PB_VOLTAGE_UV_WARNING, REGULATOR_ERROR_UNDER_VOLTAGE_WARN },
-			{ PB_VOLTAGE_UV_FAULT,   REGULATOR_ERROR_UNDER_VOLTAGE },
-			{ PB_VOLTAGE_OV_WARNING, REGULATOR_ERROR_OVER_VOLTAGE_WARN },
-			{ PB_VOLTAGE_OV_FAULT,   REGULATOR_ERROR_REGULATION_OUT },
-			{ },
-		},
-	}, {
-		.func = PMBUS_HAVE_STATUS_IOUT,
-		.reg = PMBUS_STATUS_IOUT,
-		.bits = (const struct pmbus_regulator_status_assoc[]) {
-			{ PB_IOUT_OC_WARNING,    REGULATOR_ERROR_OVER_CURRENT_WARN },
-			{ PB_IOUT_OC_FAULT,      REGULATOR_ERROR_OVER_CURRENT },
-			{ PB_IOUT_OC_LV_FAULT,   REGULATOR_ERROR_OVER_CURRENT },
-			{ },
-		},
-	}, {
-		.func = PMBUS_HAVE_STATUS_TEMP,
-		.reg = PMBUS_STATUS_TEMPERATURE,
-		.bits = (const struct pmbus_regulator_status_assoc[]) {
-			{ PB_TEMP_OT_WARNING,    REGULATOR_ERROR_OVER_TEMP_WARN },
-			{ PB_TEMP_OT_FAULT,      REGULATOR_ERROR_OVER_TEMP },
-			{ },
-		},
-	},
-};
+		if (!flags)
+			break;
+	}
+}
 
-static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned int *flags)
+static int _pmbus_get_flags(struct pmbus_data *data, u8 page, unsigned int *flags,
+			   unsigned int *event, bool notify)
 {
 	int i, status;
-	const struct pmbus_regulator_status_category *cat;
-	const struct pmbus_regulator_status_assoc *bit;
-	struct device *dev = rdev_get_dev(rdev);
-	struct i2c_client *client = to_i2c_client(dev->parent);
-	struct pmbus_data *data = i2c_get_clientdata(client);
-	u8 page = rdev_get_id(rdev);
+	const struct pmbus_status_category *cat;
+	const struct pmbus_status_assoc *bit;
+	struct device *dev = data->dev;
+	struct i2c_client *client = to_i2c_client(dev);
 	int func = data->info->func[page];
 
 	*flags = 0;
+	*event = 0;
 
-	mutex_lock(&data->update_lock);
-
-	for (i = 0; i < ARRAY_SIZE(pmbus_regulator_flag_map); i++) {
-		cat = &pmbus_regulator_flag_map[i];
+	for (i = 0; i < ARRAY_SIZE(pmbus_status_flag_map); i++) {
+		cat = &pmbus_status_flag_map[i];
 		if (!(func & cat->func))
 			continue;
 
 		status = _pmbus_read_byte_data(client, page, cat->reg);
-		if (status < 0) {
-			mutex_unlock(&data->update_lock);
+		if (status < 0)
 			return status;
-		}
 
-		for (bit = cat->bits; bit->pflag; bit++) {
-			if (status & bit->pflag)
+		for (bit = cat->bits; bit->pflag; bit++)
+			if (status & bit->pflag) {
 				*flags |= bit->rflag;
-		}
+				*event |= bit->eflag;
+			}
+
+		if (notify && status)
+			pmbus_notify(data, page, cat->reg, status);
+
 	}
 
 	/*
@@ -2823,25 +2841,32 @@ static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned
 	 * REGULATOR_ERROR_<foo>_WARN.
 	 */
 	status = pmbus_get_status(client, page, PMBUS_STATUS_WORD);
-	mutex_unlock(&data->update_lock);
 	if (status < 0)
 		return status;
 
-	if (pmbus_regulator_is_enabled(rdev)) {
-		if (status & PB_STATUS_OFF)
+	if (_pmbus_is_enabled(dev, page)) {
+		if (status & PB_STATUS_OFF) {
 			*flags |= REGULATOR_ERROR_FAIL;
+			*event |= REGULATOR_EVENT_FAIL;
+		}
 
-		if (status & PB_STATUS_POWER_GOOD_N)
+		if (status & PB_STATUS_POWER_GOOD_N) {
 			*flags |= REGULATOR_ERROR_REGULATION_OUT;
+			*event |= REGULATOR_EVENT_REGULATION_OUT;
+		}
 	}
 	/*
 	 * Unlike most other status bits, PB_STATUS_{IOUT_OC,VOUT_OV} are
 	 * defined strictly as fault indicators (not warnings).
 	 */
-	if (status & PB_STATUS_IOUT_OC)
+	if (status & PB_STATUS_IOUT_OC) {
 		*flags |= REGULATOR_ERROR_OVER_CURRENT;
-	if (status & PB_STATUS_VOUT_OV)
+		*event |= REGULATOR_EVENT_OVER_CURRENT;
+	}
+	if (status & PB_STATUS_VOUT_OV) {
 		*flags |= REGULATOR_ERROR_REGULATION_OUT;
+		*event |= REGULATOR_EVENT_FAIL;
+	}
 
 	/*
 	 * If we haven't discovered any thermal faults or warnings via
@@ -2849,12 +2874,70 @@ static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned
 	 * a (conservative) best-effort interpretation.
 	 */
 	if (!(*flags & (REGULATOR_ERROR_OVER_TEMP | REGULATOR_ERROR_OVER_TEMP_WARN)) &&
-	    (status & PB_STATUS_TEMPERATURE))
+	    (status & PB_STATUS_TEMPERATURE)) {
 		*flags |= REGULATOR_ERROR_OVER_TEMP_WARN;
+		*event |= REGULATOR_EVENT_OVER_TEMP_WARN;
+	}
+
 
 	return 0;
 }
 
+static int __maybe_unused pmbus_get_flags(struct pmbus_data *data, u8 page, unsigned int *flags,
+					  unsigned int *event, bool notify)
+{
+	int ret;
+
+	mutex_lock(&data->update_lock);
+	ret = _pmbus_get_flags(data, page, flags, event, notify);
+	mutex_unlock(&data->update_lock);
+
+	return ret;
+}
+
+#if IS_ENABLED(CONFIG_REGULATOR)
+static int pmbus_regulator_is_enabled(struct regulator_dev *rdev)
+{
+	return pmbus_is_enabled(rdev_get_dev(rdev), rdev_get_id(rdev));
+}
+
+static int _pmbus_regulator_on_off(struct regulator_dev *rdev, bool enable)
+{
+	struct device *dev = rdev_get_dev(rdev);
+	struct i2c_client *client = to_i2c_client(dev->parent);
+	struct pmbus_data *data = i2c_get_clientdata(client);
+	u8 page = rdev_get_id(rdev);
+	int ret;
+
+	mutex_lock(&data->update_lock);
+	ret = pmbus_update_byte_data(client, page, PMBUS_OPERATION,
+				     PB_OPERATION_CONTROL_ON,
+				     enable ? PB_OPERATION_CONTROL_ON : 0);
+	mutex_unlock(&data->update_lock);
+
+	return ret;
+}
+
+static int pmbus_regulator_enable(struct regulator_dev *rdev)
+{
+	return _pmbus_regulator_on_off(rdev, 1);
+}
+
+static int pmbus_regulator_disable(struct regulator_dev *rdev)
+{
+	return _pmbus_regulator_on_off(rdev, 0);
+}
+
+static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned int *flags)
+{
+	struct device *dev = rdev_get_dev(rdev);
+	struct i2c_client *client = to_i2c_client(dev->parent);
+	struct pmbus_data *data = i2c_get_clientdata(client);
+	int event;
+
+	return pmbus_get_flags(data, rdev_get_id(rdev), flags, &event, false);
+}
+
 static int pmbus_regulator_get_status(struct regulator_dev *rdev)
 {
 	struct device *dev = rdev_get_dev(rdev);
@@ -3050,9 +3133,13 @@ static int pmbus_regulator_register(struct pmbus_data *data)
 	struct device *dev = data->dev;
 	const struct pmbus_driver_info *info = data->info;
 	const struct pmbus_platform_data *pdata = dev_get_platdata(dev);
-	struct regulator_dev *rdev;
 	int i;
 
+	data->rdevs = devm_kzalloc(dev, sizeof(struct regulator_dev *) * info->num_regulators,
+				   GFP_KERNEL);
+	if (!data->rdevs)
+		return -ENOMEM;
+
 	for (i = 0; i < info->num_regulators; i++) {
 		struct regulator_config config = { };
 
@@ -3062,23 +3149,113 @@ static int pmbus_regulator_register(struct pmbus_data *data)
 		if (pdata && pdata->reg_init_data)
 			config.init_data = &pdata->reg_init_data[i];
 
-		rdev = devm_regulator_register(dev, &info->reg_desc[i],
-					       &config);
-		if (IS_ERR(rdev))
-			return dev_err_probe(dev, PTR_ERR(rdev),
+		data->rdevs[i] = devm_regulator_register(dev, &info->reg_desc[i],
+							 &config);
+		if (IS_ERR(data->rdevs[i]))
+			return dev_err_probe(dev, PTR_ERR(data->rdevs[i]),
 					     "Failed to register %s regulator\n",
 					     info->reg_desc[i].name);
 	}
 
 	return 0;
 }
+
+static int pmbus_regulator_notify(struct pmbus_data *data, int page, int event)
+{
+		int j;
+
+		for (j = 0; j < data->info->num_regulators; j++) {
+			if (page == rdev_get_id(data->rdevs[j])) {
+				regulator_notifier_call_chain(data->rdevs[j], event, NULL);
+				break;
+			}
+		}
+		return 0;
+}
 #else
 static int pmbus_regulator_register(struct pmbus_data *data)
 {
 	return 0;
 }
+
+static int pmbus_regulator_notify(struct pmbus_data *data, int page, int event)
+{
+		return 0;
+}
 #endif
 
+static int pmbus_write_smbalert_mask(struct i2c_client *client, u8 page, u8 reg, u8 val)
+{
+	return pmbus_write_word_data(client, page, PMBUS_SMBALERT_MASK, reg | (val << 8));
+}
+
+static irqreturn_t pmbus_fault_handler(int irq, void *pdata)
+{
+	struct pmbus_data *data = pdata;
+	struct i2c_client *client = to_i2c_client(data->dev);
+
+	int i, status, event;
+	mutex_lock(&data->update_lock);
+	for (i = 0; i < data->info->pages; i++) {
+		_pmbus_get_flags(data, i, &status, &event, true);
+
+		if (event)
+			pmbus_regulator_notify(data, i, event);
+	}
+
+	pmbus_clear_faults(client);
+	mutex_unlock(&data->update_lock);
+
+	return IRQ_HANDLED;
+}
+
+static int pmbus_irq_setup(struct i2c_client *client, struct pmbus_data *data)
+{
+	struct device *dev = &client->dev;
+	const struct pmbus_status_category *cat;
+	const struct pmbus_status_assoc *bit;
+	int i, j, err, func;
+	u8 mask;
+
+	static const u8 misc_status[] = {PMBUS_STATUS_CML, PMBUS_STATUS_OTHER,
+					 PMBUS_STATUS_MFR_SPECIFIC, PMBUS_STATUS_FAN_12,
+					 PMBUS_STATUS_FAN_34};
+
+	if (!client->irq)
+		return 0;
+
+	for (i = 0; i < data->info->pages; i++) {
+		func = data->info->func[i];
+
+		for (j = 0; j < ARRAY_SIZE(pmbus_status_flag_map); j++) {
+			cat = &pmbus_status_flag_map[j];
+			if (!(func & cat->func))
+				continue;
+			mask = 0;
+			for (bit = cat->bits; bit->pflag; bit++)
+				mask |= bit->pflag;
+
+			err = pmbus_write_smbalert_mask(client, i, cat->reg, ~mask);
+			if (err)
+				dev_dbg_once(dev, "Failed to set smbalert for reg 0x%02x\n",
+					     cat->reg);
+		}
+
+		for (j = 0; j < ARRAY_SIZE(misc_status); j++)
+			pmbus_write_smbalert_mask(client, i, misc_status[j], 0xff);
+	}
+
+	/* Register notifiers */
+	err = devm_request_threaded_irq(dev, client->irq, NULL, pmbus_fault_handler,
+					IRQF_ONESHOT, "pmbus-irq", data);
+	if (err) {
+		dev_err(dev, "failed to request an irq %d\n", err);
+		return err;
+	}
+
+	return 0;
+}
+
 static struct dentry *pmbus_debugfs_dir;	/* pmbus debugfs directory */
 
 #if IS_ENABLED(CONFIG_DEBUG_FS)
@@ -3086,8 +3263,13 @@ static int pmbus_debugfs_get(void *data, u64 *val)
 {
 	int rc;
 	struct pmbus_debugfs_entry *entry = data;
+	struct pmbus_data *pdata = i2c_get_clientdata(entry->client);
 
+	rc = mutex_lock_interruptible(&pdata->update_lock);
+	if (rc)
+		return rc;
 	rc = _pmbus_read_byte_data(entry->client, entry->page, entry->reg);
+	mutex_unlock(&pdata->update_lock);
 	if (rc < 0)
 		return rc;
 
@@ -3104,7 +3286,11 @@ static int pmbus_debugfs_get_status(void *data, u64 *val)
 	struct pmbus_debugfs_entry *entry = data;
 	struct pmbus_data *pdata = i2c_get_clientdata(entry->client);
 
+	rc = mutex_lock_interruptible(&pdata->update_lock);
+	if (rc)
+		return rc;
 	rc = pdata->read_status(entry->client, entry->page);
+	mutex_unlock(&pdata->update_lock);
 	if (rc < 0)
 		return rc;
 
@@ -3120,10 +3306,15 @@ static ssize_t pmbus_debugfs_mfr_read(struct file *file, char __user *buf,
 {
 	int rc;
 	struct pmbus_debugfs_entry *entry = file->private_data;
+	struct pmbus_data *pdata = i2c_get_clientdata(entry->client);
 	char data[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };
 
+	rc = mutex_lock_interruptible(&pdata->update_lock);
+	if (rc)
+		return rc;
 	rc = pmbus_read_block_data(entry->client, entry->page, entry->reg,
 				   data);
+	mutex_unlock(&pdata->update_lock);
 	if (rc < 0)
 		return rc;
 
@@ -3441,6 +3632,10 @@ int pmbus_do_probe(struct i2c_client *client, struct pmbus_driver_info *info)
 	if (ret)
 		return ret;
 
+	ret = pmbus_irq_setup(client, data);
+	if (ret)
+		return ret;
+
 	ret = pmbus_init_debugfs(client, data);
 	if (ret)
 		dev_warn(dev, "Failed to register debugfs\n");
@@ -3457,6 +3652,22 @@ struct dentry *pmbus_get_debugfs_dir(struct i2c_client *client)
 }
 EXPORT_SYMBOL_NS_GPL(pmbus_get_debugfs_dir, PMBUS);
 
+int pmbus_lock_interruptible(struct i2c_client *client)
+{
+	struct pmbus_data *data = i2c_get_clientdata(client);
+
+	return mutex_lock_interruptible(&data->update_lock);
+}
+EXPORT_SYMBOL_NS_GPL(pmbus_lock_interruptible, PMBUS);
+
+void pmbus_unlock(struct i2c_client *client)
+{
+	struct pmbus_data *data = i2c_get_clientdata(client);
+
+	mutex_unlock(&data->update_lock);
+}
+EXPORT_SYMBOL_NS_GPL(pmbus_unlock, PMBUS);
+
 static int __init pmbus_core_init(void)
 {
 	pmbus_debugfs_dir = debugfs_create_dir("pmbus", NULL);