diff --git a/drivers/hwmon/pmbus/ibm-cffps.c b/drivers/hwmon/pmbus/ibm-cffps.c
index cb56da6..5376f04 100644
--- a/drivers/hwmon/pmbus/ibm-cffps.c
+++ b/drivers/hwmon/pmbus/ibm-cffps.c
@@ -8,12 +8,26 @@
  */
 
 #include <linux/bitops.h>
+#include <linux/debugfs.h>
 #include <linux/device.h>
+#include <linux/fs.h>
 #include <linux/i2c.h>
+#include <linux/jiffies.h>
 #include <linux/module.h>
+#include <linux/mutex.h>
 
 #include "pmbus.h"
 
+#define CFFPS_FRU_CMD				0x9A
+#define CFFPS_PN_CMD				0x9B
+#define CFFPS_SN_CMD				0x9E
+#define CFFPS_CCIN_CMD				0xBD
+#define CFFPS_FW_CMD_START			0xFA
+#define CFFPS_FW_NUM_BYTES			4
+
+#define CFFPS_INPUT_HISTORY_CMD			0xD6
+#define CFFPS_INPUT_HISTORY_SIZE		100
+
 /* STATUS_MFR_SPECIFIC bits */
 #define CFFPS_MFR_FAN_FAULT			BIT(0)
 #define CFFPS_MFR_THERMAL_FAULT			BIT(1)
@@ -24,6 +38,144 @@
 #define CFFPS_MFR_VAUX_FAULT			BIT(6)
 #define CFFPS_MFR_CURRENT_SHARE_WARNING		BIT(7)
 
+enum {
+	CFFPS_DEBUGFS_INPUT_HISTORY = 0,
+	CFFPS_DEBUGFS_FRU,
+	CFFPS_DEBUGFS_PN,
+	CFFPS_DEBUGFS_SN,
+	CFFPS_DEBUGFS_CCIN,
+	CFFPS_DEBUGFS_FW,
+	CFFPS_DEBUGFS_NUM_ENTRIES
+};
+
+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 {
+	struct i2c_client *client;
+
+	struct ibm_cffps_input_history input_history;
+
+	int debugfs_entries[CFFPS_DEBUGFS_NUM_ENTRIES];
+};
+
+#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)
+{
+	int rc;
+	u8 msgbuf0[1] = { CFFPS_INPUT_HISTORY_CMD };
+	u8 msgbuf1[CFFPS_INPUT_HISTORY_SIZE + 1] = { 0 };
+	struct i2c_msg msg[2] = {
+		{
+			.addr = psu->client->addr,
+			.flags = psu->client->flags,
+			.len = 1,
+			.buf = msgbuf0,
+		}, {
+			.addr = psu->client->addr,
+			.flags = psu->client->flags | I2C_M_RD,
+			.len = CFFPS_INPUT_HISTORY_SIZE + 1,
+			.buf = msgbuf1,
+		},
+	};
+
+	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;
+			}
+
+			psu->input_history.byte_count = msgbuf1[0];
+			memcpy(psu->input_history.data, &msgbuf1[1],
+			       CFFPS_INPUT_HISTORY_SIZE);
+			psu->input_history.last_update = jiffies;
+		}
+
+		mutex_unlock(&psu->input_history.update_lock);
+	}
+
+	return simple_read_from_buffer(buf, count, ppos,
+				       psu->input_history.data,
+				       psu->input_history.byte_count);
+}
+
+static ssize_t ibm_cffps_debugfs_op(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] = { 0 };
+
+	switch (idx) {
+	case CFFPS_DEBUGFS_INPUT_HISTORY:
+		return ibm_cffps_read_input_history(psu, buf, count, ppos);
+	case CFFPS_DEBUGFS_FRU:
+		cmd = CFFPS_FRU_CMD;
+		break;
+	case CFFPS_DEBUGFS_PN:
+		cmd = CFFPS_PN_CMD;
+		break;
+	case CFFPS_DEBUGFS_SN:
+		cmd = CFFPS_SN_CMD;
+		break;
+	case CFFPS_DEBUGFS_CCIN:
+		rc = i2c_smbus_read_word_data(psu->client, CFFPS_CCIN_CMD);
+		if (rc < 0)
+			return rc;
+
+		rc = snprintf(data, 5, "%04X", be16_to_cpu(rc));
+		goto done;
+	case CFFPS_DEBUGFS_FW:
+		for (i = 0; i < CFFPS_FW_NUM_BYTES; ++i) {
+			rc = i2c_smbus_read_byte_data(psu->client,
+						      CFFPS_FW_CMD_START + i);
+			if (rc < 0)
+				return rc;
+
+			snprintf(&data[i * 2], 3, "%02X", rc);
+		}
+
+		rc = i * 2;
+		goto done;
+	default:
+		return -EINVAL;
+	}
+
+	rc = i2c_smbus_read_block_data(psu->client, cmd, data);
+	if (rc < 0)
+		return rc;
+
+done:
+	data[rc] = '\n';
+	rc += 2;
+
+	return simple_read_from_buffer(buf, count, ppos, data, rc);
+}
+
+static const struct file_operations ibm_cffps_fops = {
+	.llseek = noop_llseek,
+	.read = ibm_cffps_debugfs_op,
+	.open = simple_open,
+};
+
 static int ibm_cffps_read_byte_data(struct i2c_client *client, int page,
 				    int reg)
 {
@@ -119,7 +271,55 @@ static int ibm_cffps_read_word_data(struct i2c_client *client, int page,
 static int ibm_cffps_probe(struct i2c_client *client,
 			   const struct i2c_device_id *id)
 {
-	return pmbus_do_probe(client, id, &ibm_cffps_info);
+	int i, rc;
+	struct dentry *debugfs;
+	struct dentry *ibm_cffps_dir;
+	struct ibm_cffps *psu;
+
+	rc = pmbus_do_probe(client, id, &ibm_cffps_info);
+	if (rc)
+		return rc;
+
+	/* Don't fail the probe if we can't create debugfs */
+	debugfs = pmbus_get_debugfs_dir(client);
+	if (!debugfs)
+		return 0;
+
+	ibm_cffps_dir = debugfs_create_dir(client->name, debugfs);
+	if (!ibm_cffps_dir)
+		return 0;
+
+	psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL);
+	if (!psu)
+		return 0;
+
+	psu->client = client;
+	mutex_init(&psu->input_history.update_lock);
+	psu->input_history.last_update = jiffies - HZ;
+
+	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("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("serial_number", 0444, ibm_cffps_dir,
+			    &psu->debugfs_entries[CFFPS_DEBUGFS_SN],
+			    &ibm_cffps_fops);
+	debugfs_create_file("ccin", 0444, ibm_cffps_dir,
+			    &psu->debugfs_entries[CFFPS_DEBUGFS_CCIN],
+			    &ibm_cffps_fops);
+	debugfs_create_file("fw_version", 0444, ibm_cffps_dir,
+			    &psu->debugfs_entries[CFFPS_DEBUGFS_FW],
+			    &ibm_cffps_fops);
+
+	return 0;
 }
 
 static const struct i2c_device_id ibm_cffps_id[] = {
