Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1251 insertions, 0 deletions

diff --git a/drivers/hwmon/occ/common.c b/drivers/hwmon/occ/common.c
new file mode 100644
index 000000000..dd690f700
--- /dev/null
+++ b/drivers/hwmon/occ/common.c
@@ -0,0 +1,1251 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright IBM Corp 2019
+
+#include <linux/device.h>
+#include <linux/export.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/math64.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/property.h>
+#include <linux/sysfs.h>
+#include <asm/unaligned.h>
+
+#include "common.h"
+
+#define EXTN_FLAG_SENSOR_ID		BIT(7)
+
+#define OCC_ERROR_COUNT_THRESHOLD	2	/* required by OCC spec */
+
+#define OCC_STATE_SAFE			4
+#define OCC_SAFE_TIMEOUT		msecs_to_jiffies(60000) /* 1 min */
+
+#define OCC_UPDATE_FREQUENCY		msecs_to_jiffies(1000)
+
+#define OCC_TEMP_SENSOR_FAULT		0xFF
+
+#define OCC_FRU_TYPE_VRM		3
+
+/* OCC sensor type and version definitions */
+
+struct temp_sensor_1 {
+	u16 sensor_id;
+	u16 value;
+} __packed;
+
+struct temp_sensor_2 {
+	u32 sensor_id;
+	u8 fru_type;
+	u8 value;
+} __packed;
+
+struct temp_sensor_10 {
+	u32 sensor_id;
+	u8 fru_type;
+	u8 value;
+	u8 throttle;
+	u8 reserved;
+} __packed;
+
+struct freq_sensor_1 {
+	u16 sensor_id;
+	u16 value;
+} __packed;
+
+struct freq_sensor_2 {
+	u32 sensor_id;
+	u16 value;
+} __packed;
+
+struct power_sensor_1 {
+	u16 sensor_id;
+	u32 update_tag;
+	u32 accumulator;
+	u16 value;
+} __packed;
+
+struct power_sensor_2 {
+	u32 sensor_id;
+	u8 function_id;
+	u8 apss_channel;
+	u16 reserved;
+	u32 update_tag;
+	u64 accumulator;
+	u16 value;
+} __packed;
+
+struct power_sensor_data {
+	u16 value;
+	u32 update_tag;
+	u64 accumulator;
+} __packed;
+
+struct power_sensor_data_and_time {
+	u16 update_time;
+	u16 value;
+	u32 update_tag;
+	u64 accumulator;
+} __packed;
+
+struct power_sensor_a0 {
+	u32 sensor_id;
+	struct power_sensor_data_and_time system;
+	u32 reserved;
+	struct power_sensor_data_and_time proc;
+	struct power_sensor_data vdd;
+	struct power_sensor_data vdn;
+} __packed;
+
+struct caps_sensor_2 {
+	u16 cap;
+	u16 system_power;
+	u16 n_cap;
+	u16 max;
+	u16 min;
+	u16 user;
+	u8 user_source;
+} __packed;
+
+struct caps_sensor_3 {
+	u16 cap;
+	u16 system_power;
+	u16 n_cap;
+	u16 max;
+	u16 hard_min;
+	u16 soft_min;
+	u16 user;
+	u8 user_source;
+} __packed;
+
+struct extended_sensor {
+	union {
+		u8 name[4];
+		u32 sensor_id;
+	};
+	u8 flags;
+	u8 reserved;
+	u8 data[6];
+} __packed;
+
+static int occ_poll(struct occ *occ)
+{
+	int rc;
+	u8 cmd[7];
+	struct occ_poll_response_header *header;
+
+	/* big endian */
+	cmd[0] = 0;			/* sequence number */
+	cmd[1] = 0;			/* cmd type */
+	cmd[2] = 0;			/* data length msb */
+	cmd[3] = 1;			/* data length lsb */
+	cmd[4] = occ->poll_cmd_data;	/* data */
+	cmd[5] = 0;			/* checksum msb */
+	cmd[6] = 0;			/* checksum lsb */
+
+	/* mutex should already be locked if necessary */
+	rc = occ->send_cmd(occ, cmd, sizeof(cmd), &occ->resp, sizeof(occ->resp));
+	if (rc) {
+		occ->last_error = rc;
+		if (occ->error_count++ > OCC_ERROR_COUNT_THRESHOLD)
+			occ->error = rc;
+
+		goto done;
+	}
+
+	/* clear error since communication was successful */
+	occ->error_count = 0;
+	occ->last_error = 0;
+	occ->error = 0;
+
+	/* check for safe state */
+	header = (struct occ_poll_response_header *)occ->resp.data;
+	if (header->occ_state == OCC_STATE_SAFE) {
+		if (occ->last_safe) {
+			if (time_after(jiffies,
+				       occ->last_safe + OCC_SAFE_TIMEOUT))
+				occ->error = -EHOSTDOWN;
+		} else {
+			occ->last_safe = jiffies;
+		}
+	} else {
+		occ->last_safe = 0;
+	}
+
+done:
+	occ_sysfs_poll_done(occ);
+	return rc;
+}
+
+static int occ_set_user_power_cap(struct occ *occ, u16 user_power_cap)
+{
+	int rc;
+	u8 cmd[8];
+	u8 resp[8];
+	__be16 user_power_cap_be = cpu_to_be16(user_power_cap);
+
+	cmd[0] = 0;	/* sequence number */
+	cmd[1] = 0x22;	/* cmd type */
+	cmd[2] = 0;	/* data length msb */
+	cmd[3] = 2;	/* data length lsb */
+
+	memcpy(&cmd[4], &user_power_cap_be, 2);
+
+	cmd[6] = 0;	/* checksum msb */
+	cmd[7] = 0;	/* checksum lsb */
+
+	rc = mutex_lock_interruptible(&occ->lock);
+	if (rc)
+		return rc;
+
+	rc = occ->send_cmd(occ, cmd, sizeof(cmd), resp, sizeof(resp));
+
+	mutex_unlock(&occ->lock);
+
+	return rc;
+}
+
+int occ_update_response(struct occ *occ)
+{
+	int rc = mutex_lock_interruptible(&occ->lock);
+
+	if (rc)
+		return rc;
+
+	/* limit the maximum rate of polling the OCC */
+	if (time_after(jiffies, occ->next_update)) {
+		rc = occ_poll(occ);
+		occ->next_update = jiffies + OCC_UPDATE_FREQUENCY;
+	} else {
+		rc = occ->last_error;
+	}
+
+	mutex_unlock(&occ->lock);
+	return rc;
+}
+
+static ssize_t occ_show_temp_1(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	int rc;
+	u32 val = 0;
+	struct temp_sensor_1 *temp;
+	struct occ *occ = dev_get_drvdata(dev);
+	struct occ_sensors *sensors = &occ->sensors;
+	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+
+	rc = occ_update_response(occ);
+	if (rc)
+		return rc;
+
+	temp = ((struct temp_sensor_1 *)sensors->temp.data) + sattr->index;
+
+	switch (sattr->nr) {
+	case 0:
+		val = get_unaligned_be16(&temp->sensor_id);
+		break;
+	case 1:
+		/*
+		 * If a sensor reading has expired and couldn't be refreshed,
+		 * OCC returns 0xFFFF for that sensor.
+		 */
+		if (temp->value == 0xFFFF)
+			return -EREMOTEIO;
+		val = get_unaligned_be16(&temp->value) * 1000;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return sysfs_emit(buf, "%u\n", val);
+}
+
+static ssize_t occ_show_temp_2(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	int rc;
+	u32 val = 0;
+	struct temp_sensor_2 *temp;
+	struct occ *occ = dev_get_drvdata(dev);
+	struct occ_sensors *sensors = &occ->sensors;
+	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+
+	rc = occ_update_response(occ);
+	if (rc)
+		return rc;
+
+	temp = ((struct temp_sensor_2 *)sensors->temp.data) + sattr->index;
+
+	switch (sattr->nr) {
+	case 0:
+		val = get_unaligned_be32(&temp->sensor_id);
+		break;
+	case 1:
+		val = temp->value;
+		if (val == OCC_TEMP_SENSOR_FAULT)
+			return -EREMOTEIO;
+
+		/*
+		 * VRM doesn't return temperature, only alarm bit. This
+		 * attribute maps to tempX_alarm instead of tempX_input for
+		 * VRM
+		 */
+		if (temp->fru_type != OCC_FRU_TYPE_VRM) {
+			/* sensor not ready */
+			if (val == 0)
+				return -EAGAIN;
+
+			val *= 1000;
+		}
+		break;
+	case 2:
+		val = temp->fru_type;
+		break;
+	case 3:
+		val = temp->value == OCC_TEMP_SENSOR_FAULT;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return sysfs_emit(buf, "%u\n", val);
+}
+
+static ssize_t occ_show_temp_10(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	int rc;
+	u32 val = 0;
+	struct temp_sensor_10 *temp;
+	struct occ *occ = dev_get_drvdata(dev);
+	struct occ_sensors *sensors = &occ->sensors;
+	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+
+	rc = occ_update_response(occ);
+	if (rc)
+		return rc;
+
+	temp = ((struct temp_sensor_10 *)sensors->temp.data) + sattr->index;
+
+	switch (sattr->nr) {
+	case 0:
+		val = get_unaligned_be32(&temp->sensor_id);
+		break;
+	case 1:
+		val = temp->value;
+		if (val == OCC_TEMP_SENSOR_FAULT)
+			return -EREMOTEIO;
+
+		/* sensor not ready */
+		if (val == 0)
+			return -EAGAIN;
+
+		val *= 1000;
+		break;
+	case 2:
+		val = temp->fru_type;
+		break;
+	case 3:
+		val = temp->value == OCC_TEMP_SENSOR_FAULT;
+		break;
+	case 4:
+		val = temp->throttle * 1000;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return sysfs_emit(buf, "%u\n", val);
+}
+
+static ssize_t occ_show_freq_1(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	int rc;
+	u16 val = 0;
+	struct freq_sensor_1 *freq;
+	struct occ *occ = dev_get_drvdata(dev);
+	struct occ_sensors *sensors = &occ->sensors;
+	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+
+	rc = occ_update_response(occ);
+	if (rc)
+		return rc;
+
+	freq = ((struct freq_sensor_1 *)sensors->freq.data) + sattr->index;
+
+	switch (sattr->nr) {
+	case 0:
+		val = get_unaligned_be16(&freq->sensor_id);
+		break;
+	case 1:
+		val = get_unaligned_be16(&freq->value);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return sysfs_emit(buf, "%u\n", val);
+}
+
+static ssize_t occ_show_freq_2(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	int rc;
+	u32 val = 0;
+	struct freq_sensor_2 *freq;
+	struct occ *occ = dev_get_drvdata(dev);
+	struct occ_sensors *sensors = &occ->sensors;
+	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+
+	rc = occ_update_response(occ);
+	if (rc)
+		return rc;
+
+	freq = ((struct freq_sensor_2 *)sensors->freq.data) + sattr->index;
+
+	switch (sattr->nr) {
+	case 0:
+		val = get_unaligned_be32(&freq->sensor_id);
+		break;
+	case 1:
+		val = get_unaligned_be16(&freq->value);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return sysfs_emit(buf, "%u\n", val);
+}
+
+static ssize_t occ_show_power_1(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	int rc;
+	u64 val = 0;
+	struct power_sensor_1 *power;
+	struct occ *occ = dev_get_drvdata(dev);
+	struct occ_sensors *sensors = &occ->sensors;
+	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+
+	rc = occ_update_response(occ);
+	if (rc)
+		return rc;
+
+	power = ((struct power_sensor_1 *)sensors->power.data) + sattr->index;
+
+	switch (sattr->nr) {
+	case 0:
+		val = get_unaligned_be16(&power->sensor_id);
+		break;
+	case 1:
+		val = get_unaligned_be32(&power->accumulator) /
+			get_unaligned_be32(&power->update_tag);
+		val *= 1000000ULL;
+		break;
+	case 2:
+		val = (u64)get_unaligned_be32(&power->update_tag) *
+			   occ->powr_sample_time_us;
+		break;
+	case 3:
+		val = get_unaligned_be16(&power->value) * 1000000ULL;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return sysfs_emit(buf, "%llu\n", val);
+}
+
+static u64 occ_get_powr_avg(u64 *accum, u32 *samples)
+{
+	u64 divisor = get_unaligned_be32(samples);
+
+	return (divisor == 0) ? 0 :
+		div64_u64(get_unaligned_be64(accum) * 1000000ULL, divisor);
+}
+
+static ssize_t occ_show_power_2(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	int rc;
+	u64 val = 0;
+	struct power_sensor_2 *power;
+	struct occ *occ = dev_get_drvdata(dev);
+	struct occ_sensors *sensors = &occ->sensors;
+	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+
+	rc = occ_update_response(occ);
+	if (rc)
+		return rc;
+
+	power = ((struct power_sensor_2 *)sensors->power.data) + sattr->index;
+
+	switch (sattr->nr) {
+	case 0:
+		return sysfs_emit(buf, "%u_%u_%u\n",
+				  get_unaligned_be32(&power->sensor_id),
+				  power->function_id, power->apss_channel);
+	case 1:
+		val = occ_get_powr_avg(&power->accumulator,
+				       &power->update_tag);
+		break;
+	case 2:
+		val = (u64)get_unaligned_be32(&power->update_tag) *
+			   occ->powr_sample_time_us;
+		break;
+	case 3:
+		val = get_unaligned_be16(&power->value) * 1000000ULL;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return sysfs_emit(buf, "%llu\n", val);
+}
+
+static ssize_t occ_show_power_a0(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	int rc;
+	u64 val = 0;
+	struct power_sensor_a0 *power;
+	struct occ *occ = dev_get_drvdata(dev);
+	struct occ_sensors *sensors = &occ->sensors;
+	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+
+	rc = occ_update_response(occ);
+	if (rc)
+		return rc;
+
+	power = ((struct power_sensor_a0 *)sensors->power.data) + sattr->index;
+
+	switch (sattr->nr) {
+	case 0:
+		return sysfs_emit(buf, "%u_system\n",
+				  get_unaligned_be32(&power->sensor_id));
+	case 1:
+		val = occ_get_powr_avg(&power->system.accumulator,
+				       &power->system.update_tag);
+		break;
+	case 2:
+		val = (u64)get_unaligned_be32(&power->system.update_tag) *
+			   occ->powr_sample_time_us;
+		break;
+	case 3:
+		val = get_unaligned_be16(&power->system.value) * 1000000ULL;
+		break;
+	case 4:
+		return sysfs_emit(buf, "%u_proc\n",
+				  get_unaligned_be32(&power->sensor_id));
+	case 5:
+		val = occ_get_powr_avg(&power->proc.accumulator,
+				       &power->proc.update_tag);
+		break;
+	case 6:
+		val = (u64)get_unaligned_be32(&power->proc.update_tag) *
+			   occ->powr_sample_time_us;
+		break;
+	case 7:
+		val = get_unaligned_be16(&power->proc.value) * 1000000ULL;
+		break;
+	case 8:
+		return sysfs_emit(buf, "%u_vdd\n",
+				  get_unaligned_be32(&power->sensor_id));
+	case 9:
+		val = occ_get_powr_avg(&power->vdd.accumulator,
+				       &power->vdd.update_tag);
+		break;
+	case 10:
+		val = (u64)get_unaligned_be32(&power->vdd.update_tag) *
+			   occ->powr_sample_time_us;
+		break;
+	case 11:
+		val = get_unaligned_be16(&power->vdd.value) * 1000000ULL;
+		break;
+	case 12:
+		return sysfs_emit(buf, "%u_vdn\n",
+				  get_unaligned_be32(&power->sensor_id));
+	case 13:
+		val = occ_get_powr_avg(&power->vdn.accumulator,
+				       &power->vdn.update_tag);
+		break;
+	case 14:
+		val = (u64)get_unaligned_be32(&power->vdn.update_tag) *
+			   occ->powr_sample_time_us;
+		break;
+	case 15:
+		val = get_unaligned_be16(&power->vdn.value) * 1000000ULL;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return sysfs_emit(buf, "%llu\n", val);
+}
+
+static ssize_t occ_show_caps_1_2(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	int rc;
+	u64 val = 0;
+	struct caps_sensor_2 *caps;
+	struct occ *occ = dev_get_drvdata(dev);
+	struct occ_sensors *sensors = &occ->sensors;
+	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+
+	rc = occ_update_response(occ);
+	if (rc)
+		return rc;
+
+	caps = ((struct caps_sensor_2 *)sensors->caps.data) + sattr->index;
+
+	switch (sattr->nr) {
+	case 0:
+		return sysfs_emit(buf, "system\n");
+	case 1:
+		val = get_unaligned_be16(&caps->cap) * 1000000ULL;
+		break;
+	case 2:
+		val = get_unaligned_be16(&caps->system_power) * 1000000ULL;
+		break;
+	case 3:
+		val = get_unaligned_be16(&caps->n_cap) * 1000000ULL;
+		break;
+	case 4:
+		val = get_unaligned_be16(&caps->max) * 1000000ULL;
+		break;
+	case 5:
+		val = get_unaligned_be16(&caps->min) * 1000000ULL;
+		break;
+	case 6:
+		val = get_unaligned_be16(&caps->user) * 1000000ULL;
+		break;
+	case 7:
+		if (occ->sensors.caps.version == 1)
+			return -EINVAL;
+
+		val = caps->user_source;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return sysfs_emit(buf, "%llu\n", val);
+}
+
+static ssize_t occ_show_caps_3(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	int rc;
+	u64 val = 0;
+	struct caps_sensor_3 *caps;
+	struct occ *occ = dev_get_drvdata(dev);
+	struct occ_sensors *sensors = &occ->sensors;
+	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+
+	rc = occ_update_response(occ);
+	if (rc)
+		return rc;
+
+	caps = ((struct caps_sensor_3 *)sensors->caps.data) + sattr->index;
+
+	switch (sattr->nr) {
+	case 0:
+		return sysfs_emit(buf, "system\n");
+	case 1:
+		val = get_unaligned_be16(&caps->cap) * 1000000ULL;
+		break;
+	case 2:
+		val = get_unaligned_be16(&caps->system_power) * 1000000ULL;
+		break;
+	case 3:
+		val = get_unaligned_be16(&caps->n_cap) * 1000000ULL;
+		break;
+	case 4:
+		val = get_unaligned_be16(&caps->max) * 1000000ULL;
+		break;
+	case 5:
+		val = get_unaligned_be16(&caps->hard_min) * 1000000ULL;
+		break;
+	case 6:
+		val = get_unaligned_be16(&caps->user) * 1000000ULL;
+		break;
+	case 7:
+		val = caps->user_source;
+		break;
+	case 8:
+		val = get_unaligned_be16(&caps->soft_min) * 1000000ULL;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return sysfs_emit(buf, "%llu\n", val);
+}
+
+static ssize_t occ_store_caps_user(struct device *dev,
+				   struct device_attribute *attr,
+				   const char *buf, size_t count)
+{
+	int rc;
+	u16 user_power_cap;
+	unsigned long long value;
+	struct occ *occ = dev_get_drvdata(dev);
+
+	rc = kstrtoull(buf, 0, &value);
+	if (rc)
+		return rc;
+
+	user_power_cap = div64_u64(value, 1000000ULL); /* microwatt to watt */
+
+	rc = occ_set_user_power_cap(occ, user_power_cap);
+	if (rc)
+		return rc;
+
+	return count;
+}
+
+static ssize_t occ_show_extended(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	int rc;
+	struct extended_sensor *extn;
+	struct occ *occ = dev_get_drvdata(dev);
+	struct occ_sensors *sensors = &occ->sensors;
+	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+
+	rc = occ_update_response(occ);
+	if (rc)
+		return rc;
+
+	extn = ((struct extended_sensor *)sensors->extended.data) +
+		sattr->index;
+
+	switch (sattr->nr) {
+	case 0:
+		if (extn->flags & EXTN_FLAG_SENSOR_ID) {
+			rc = sysfs_emit(buf, "%u",
+					get_unaligned_be32(&extn->sensor_id));
+		} else {
+			rc = sysfs_emit(buf, "%4phN\n", extn->name);
+		}
+		break;
+	case 1:
+		rc = sysfs_emit(buf, "%02x\n", extn->flags);
+		break;
+	case 2:
+		rc = sysfs_emit(buf, "%6phN\n", extn->data);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return rc;
+}
+
+/*
+ * Some helper macros to make it easier to define an occ_attribute. Since these
+ * are dynamically allocated, we shouldn't use the existing kernel macros which
+ * stringify the name argument.
+ */
+#define ATTR_OCC(_name, _mode, _show, _store) {				\
+	.attr	= {							\
+		.name = _name,						\
+		.mode = VERIFY_OCTAL_PERMISSIONS(_mode),		\
+	},								\
+	.show	= _show,						\
+	.store	= _store,						\
+}
+
+#define SENSOR_ATTR_OCC(_name, _mode, _show, _store, _nr, _index) {	\
+	.dev_attr	= ATTR_OCC(_name, _mode, _show, _store),	\
+	.index		= _index,					\
+	.nr		= _nr,						\
+}
+
+#define OCC_INIT_ATTR(_name, _mode, _show, _store, _nr, _index)		\
+	((struct sensor_device_attribute_2)				\
+		SENSOR_ATTR_OCC(_name, _mode, _show, _store, _nr, _index))
+
+/*
+ * Allocate and instatiate sensor_device_attribute_2s. It's most efficient to
+ * use our own instead of the built-in hwmon attribute types.
+ */
+static int occ_setup_sensor_attrs(struct occ *occ)
+{
+	unsigned int i, s, num_attrs = 0;
+	struct device *dev = occ->bus_dev;
+	struct occ_sensors *sensors = &occ->sensors;
+	struct occ_attribute *attr;
+	struct temp_sensor_2 *temp;
+	ssize_t (*show_temp)(struct device *, struct device_attribute *,
+			     char *) = occ_show_temp_1;
+	ssize_t (*show_freq)(struct device *, struct device_attribute *,
+			     char *) = occ_show_freq_1;
+	ssize_t (*show_power)(struct device *, struct device_attribute *,
+			      char *) = occ_show_power_1;
+	ssize_t (*show_caps)(struct device *, struct device_attribute *,
+			     char *) = occ_show_caps_1_2;
+
+	switch (sensors->temp.version) {
+	case 1:
+		num_attrs += (sensors->temp.num_sensors * 2);
+		break;
+	case 2:
+		num_attrs += (sensors->temp.num_sensors * 4);
+		show_temp = occ_show_temp_2;
+		break;
+	case 0x10:
+		num_attrs += (sensors->temp.num_sensors * 5);
+		show_temp = occ_show_temp_10;
+		break;
+	default:
+		sensors->temp.num_sensors = 0;
+	}
+
+	switch (sensors->freq.version) {
+	case 2:
+		show_freq = occ_show_freq_2;
+		fallthrough;
+	case 1:
+		num_attrs += (sensors->freq.num_sensors * 2);
+		break;
+	default:
+		sensors->freq.num_sensors = 0;
+	}
+
+	switch (sensors->power.version) {
+	case 2:
+		show_power = occ_show_power_2;
+		fallthrough;
+	case 1:
+		num_attrs += (sensors->power.num_sensors * 4);
+		break;
+	case 0xA0:
+		num_attrs += (sensors->power.num_sensors * 16);
+		show_power = occ_show_power_a0;
+		break;
+	default:
+		sensors->power.num_sensors = 0;
+	}
+
+	switch (sensors->caps.version) {
+	case 1:
+		num_attrs += (sensors->caps.num_sensors * 7);
+		break;
+	case 2:
+		num_attrs += (sensors->caps.num_sensors * 8);
+		break;
+	case 3:
+		show_caps = occ_show_caps_3;
+		num_attrs += (sensors->caps.num_sensors * 9);
+		break;
+	default:
+		sensors->caps.num_sensors = 0;
+	}
+
+	switch (sensors->extended.version) {
+	case 1:
+		num_attrs += (sensors->extended.num_sensors * 3);
+		break;
+	default:
+		sensors->extended.num_sensors = 0;
+	}
+
+	occ->attrs = devm_kzalloc(dev, sizeof(*occ->attrs) * num_attrs,
+				  GFP_KERNEL);
+	if (!occ->attrs)
+		return -ENOMEM;
+
+	/* null-terminated list */
+	occ->group.attrs = devm_kzalloc(dev, sizeof(*occ->group.attrs) *
+					num_attrs + 1, GFP_KERNEL);
+	if (!occ->group.attrs)
+		return -ENOMEM;
+
+	attr = occ->attrs;
+
+	for (i = 0; i < sensors->temp.num_sensors; ++i) {
+		s = i + 1;
+		temp = ((struct temp_sensor_2 *)sensors->temp.data) + i;
+
+		snprintf(attr->name, sizeof(attr->name), "temp%d_label", s);
+		attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_temp, NULL,
+					     0, i);
+		attr++;
+
+		if (sensors->temp.version == 2 &&
+		    temp->fru_type == OCC_FRU_TYPE_VRM) {
+			snprintf(attr->name, sizeof(attr->name),
+				 "temp%d_alarm", s);
+		} else {
+			snprintf(attr->name, sizeof(attr->name),
+				 "temp%d_input", s);
+		}
+
+		attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_temp, NULL,
+					     1, i);
+		attr++;
+
+		if (sensors->temp.version > 1) {
+			snprintf(attr->name, sizeof(attr->name),
+				 "temp%d_fru_type", s);
+			attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
+						     show_temp, NULL, 2, i);
+			attr++;
+
+			snprintf(attr->name, sizeof(attr->name),
+				 "temp%d_fault", s);
+			attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
+						     show_temp, NULL, 3, i);
+			attr++;
+
+			if (sensors->temp.version == 0x10) {
+				snprintf(attr->name, sizeof(attr->name),
+					 "temp%d_max", s);
+				attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
+							     show_temp, NULL,
+							     4, i);
+				attr++;
+			}
+		}
+	}
+
+	for (i = 0; i < sensors->freq.num_sensors; ++i) {
+		s = i + 1;
+
+		snprintf(attr->name, sizeof(attr->name), "freq%d_label", s);
+		attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_freq, NULL,
+					     0, i);
+		attr++;
+
+		snprintf(attr->name, sizeof(attr->name), "freq%d_input", s);
+		attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_freq, NULL,
+					     1, i);
+		attr++;
+	}
+
+	if (sensors->power.version == 0xA0) {
+		/*
+		 * Special case for many-attribute power sensor. Split it into
+		 * a sensor number per power type, emulating several sensors.
+		 */
+		for (i = 0; i < sensors->power.num_sensors; ++i) {
+			unsigned int j;
+			unsigned int nr = 0;
+
+			s = (i * 4) + 1;
+
+			for (j = 0; j < 4; ++j) {
+				snprintf(attr->name, sizeof(attr->name),
+					 "power%d_label", s);
+				attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
+							     show_power, NULL,
+							     nr++, i);
+				attr++;
+
+				snprintf(attr->name, sizeof(attr->name),
+					 "power%d_average", s);
+				attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
+							     show_power, NULL,
+							     nr++, i);
+				attr++;
+
+				snprintf(attr->name, sizeof(attr->name),
+					 "power%d_average_interval", s);
+				attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
+							     show_power, NULL,
+							     nr++, i);
+				attr++;
+
+				snprintf(attr->name, sizeof(attr->name),
+					 "power%d_input", s);
+				attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
+							     show_power, NULL,
+							     nr++, i);
+				attr++;
+
+				s++;
+			}
+		}
+
+		s = (sensors->power.num_sensors * 4) + 1;
+	} else {
+		for (i = 0; i < sensors->power.num_sensors; ++i) {
+			s = i + 1;
+
+			snprintf(attr->name, sizeof(attr->name),
+				 "power%d_label", s);
+			attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
+						     show_power, NULL, 0, i);
+			attr++;
+
+			snprintf(attr->name, sizeof(attr->name),
+				 "power%d_average", s);
+			attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
+						     show_power, NULL, 1, i);
+			attr++;
+
+			snprintf(attr->name, sizeof(attr->name),
+				 "power%d_average_interval", s);
+			attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
+						     show_power, NULL, 2, i);
+			attr++;
+
+			snprintf(attr->name, sizeof(attr->name),
+				 "power%d_input", s);
+			attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
+						     show_power, NULL, 3, i);
+			attr++;
+		}
+
+		s = sensors->power.num_sensors + 1;
+	}
+
+	if (sensors->caps.num_sensors >= 1) {
+		snprintf(attr->name, sizeof(attr->name), "power%d_label", s);
+		attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_caps, NULL,
+					     0, 0);
+		attr++;
+
+		snprintf(attr->name, sizeof(attr->name), "power%d_cap", s);
+		attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_caps, NULL,
+					     1, 0);
+		attr++;
+
+		snprintf(attr->name, sizeof(attr->name), "power%d_input", s);
+		attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_caps, NULL,
+					     2, 0);
+		attr++;
+
+		snprintf(attr->name, sizeof(attr->name),
+			 "power%d_cap_not_redundant", s);
+		attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_caps, NULL,
+					     3, 0);
+		attr++;
+
+		snprintf(attr->name, sizeof(attr->name), "power%d_cap_max", s);
+		attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_caps, NULL,
+					     4, 0);
+		attr++;
+
+		snprintf(attr->name, sizeof(attr->name), "power%d_cap_min", s);
+		attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_caps, NULL,
+					     5, 0);
+		attr++;
+
+		snprintf(attr->name, sizeof(attr->name), "power%d_cap_user",
+			 s);
+		attr->sensor = OCC_INIT_ATTR(attr->name, 0644, show_caps,
+					     occ_store_caps_user, 6, 0);
+		attr++;
+
+		if (sensors->caps.version > 1) {
+			snprintf(attr->name, sizeof(attr->name),
+				 "power%d_cap_user_source", s);
+			attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
+						     show_caps, NULL, 7, 0);
+			attr++;
+
+			if (sensors->caps.version > 2) {
+				snprintf(attr->name, sizeof(attr->name),
+					 "power%d_cap_min_soft", s);
+				attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
+							     show_caps, NULL,
+							     8, 0);
+				attr++;
+			}
+		}
+	}
+
+	for (i = 0; i < sensors->extended.num_sensors; ++i) {
+		s = i + 1;
+
+		snprintf(attr->name, sizeof(attr->name), "extn%d_label", s);
+		attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
+					     occ_show_extended, NULL, 0, i);
+		attr++;
+
+		snprintf(attr->name, sizeof(attr->name), "extn%d_flags", s);
+		attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
+					     occ_show_extended, NULL, 1, i);
+		attr++;
+
+		snprintf(attr->name, sizeof(attr->name), "extn%d_input", s);
+		attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
+					     occ_show_extended, NULL, 2, i);
+		attr++;
+	}
+
+	/* put the sensors in the group */
+	for (i = 0; i < num_attrs; ++i) {
+		sysfs_attr_init(&occ->attrs[i].sensor.dev_attr.attr);
+		occ->group.attrs[i] = &occ->attrs[i].sensor.dev_attr.attr;
+	}
+
+	return 0;
+}
+
+/* only need to do this once at startup, as OCC won't change sensors on us */
+static void occ_parse_poll_response(struct occ *occ)
+{
+	unsigned int i, old_offset, offset = 0, size = 0;
+	struct occ_sensor *sensor;
+	struct occ_sensors *sensors = &occ->sensors;
+	struct occ_response *resp = &occ->resp;
+	struct occ_poll_response *poll =
+		(struct occ_poll_response *)&resp->data[0];
+	struct occ_poll_response_header *header = &poll->header;
+	struct occ_sensor_data_block *block = &poll->block;
+
+	dev_info(occ->bus_dev, "OCC found, code level: %.16s\n",
+		 header->occ_code_level);
+
+	for (i = 0; i < header->num_sensor_data_blocks; ++i) {
+		block = (struct occ_sensor_data_block *)((u8 *)block + offset);
+		old_offset = offset;
+		offset = (block->header.num_sensors *
+			  block->header.sensor_length) + sizeof(block->header);
+		size += offset;
+
+		/* validate all the length/size fields */
+		if ((size + sizeof(*header)) >= OCC_RESP_DATA_BYTES) {
+			dev_warn(occ->bus_dev, "exceeded response buffer\n");
+			return;
+		}
+
+		dev_dbg(occ->bus_dev, " %04x..%04x: %.4s (%d sensors)\n",
+			old_offset, offset - 1, block->header.eye_catcher,
+			block->header.num_sensors);
+
+		/* match sensor block type */
+		if (strncmp(block->header.eye_catcher, "TEMP", 4) == 0)
+			sensor = &sensors->temp;
+		else if (strncmp(block->header.eye_catcher, "FREQ", 4) == 0)
+			sensor = &sensors->freq;
+		else if (strncmp(block->header.eye_catcher, "POWR", 4) == 0)
+			sensor = &sensors->power;
+		else if (strncmp(block->header.eye_catcher, "CAPS", 4) == 0)
+			sensor = &sensors->caps;
+		else if (strncmp(block->header.eye_catcher, "EXTN", 4) == 0)
+			sensor = &sensors->extended;
+		else {
+			dev_warn(occ->bus_dev, "sensor not supported %.4s\n",
+				 block->header.eye_catcher);
+			continue;
+		}
+
+		sensor->num_sensors = block->header.num_sensors;
+		sensor->version = block->header.sensor_format;
+		sensor->data = &block->data;
+	}
+
+	dev_dbg(occ->bus_dev, "Max resp size: %u+%zd=%zd\n", size,
+		sizeof(*header), size + sizeof(*header));
+}
+
+int occ_active(struct occ *occ, bool active)
+{
+	int rc = mutex_lock_interruptible(&occ->lock);
+
+	if (rc)
+		return rc;
+
+	if (active) {
+		if (occ->active) {
+			rc = -EALREADY;
+			goto unlock;
+		}
+
+		occ->error_count = 0;
+		occ->last_safe = 0;
+
+		rc = occ_poll(occ);
+		if (rc < 0) {
+			dev_err(occ->bus_dev,
+				"failed to get OCC poll response=%02x: %d\n",
+				occ->resp.return_status, rc);
+			goto unlock;
+		}
+
+		occ->active = true;
+		occ->next_update = jiffies + OCC_UPDATE_FREQUENCY;
+		occ_parse_poll_response(occ);
+
+		rc = occ_setup_sensor_attrs(occ);
+		if (rc) {
+			dev_err(occ->bus_dev,
+				"failed to setup sensor attrs: %d\n", rc);
+			goto unlock;
+		}
+
+		occ->hwmon = hwmon_device_register_with_groups(occ->bus_dev,
+							       "occ", occ,
+							       occ->groups);
+		if (IS_ERR(occ->hwmon)) {
+			rc = PTR_ERR(occ->hwmon);
+			occ->hwmon = NULL;
+			dev_err(occ->bus_dev,
+				"failed to register hwmon device: %d\n", rc);
+			goto unlock;
+		}
+	} else {
+		if (!occ->active) {
+			rc = -EALREADY;
+			goto unlock;
+		}
+
+		if (occ->hwmon)
+			hwmon_device_unregister(occ->hwmon);
+		occ->active = false;
+		occ->hwmon = NULL;
+	}
+
+unlock:
+	mutex_unlock(&occ->lock);
+	return rc;
+}
+
+int occ_setup(struct occ *occ)
+{
+	int rc;
+
+	mutex_init(&occ->lock);
+	occ->groups[0] = &occ->group;
+
+	rc = occ_setup_sysfs(occ);
+	if (rc) {
+		dev_err(occ->bus_dev, "failed to setup sysfs: %d\n", rc);
+		return rc;
+	}
+
+	if (!device_property_read_bool(occ->bus_dev, "ibm,no-poll-on-init")) {
+		rc = occ_active(occ, true);
+		if (rc)
+			occ_shutdown_sysfs(occ);
+	}
+
+	return rc;
+}
+EXPORT_SYMBOL_GPL(occ_setup);
+
+void occ_shutdown(struct occ *occ)
+{
+	mutex_lock(&occ->lock);
+
+	occ_shutdown_sysfs(occ);
+
+	if (occ->hwmon)
+		hwmon_device_unregister(occ->hwmon);
+	occ->hwmon = NULL;
+
+	mutex_unlock(&occ->lock);
+}
+EXPORT_SYMBOL_GPL(occ_shutdown);
+
+MODULE_AUTHOR("Eddie James <eajames@linux.ibm.com>");
+MODULE_DESCRIPTION("Common OCC hwmon code");
+MODULE_LICENSE("GPL");