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-rw-r--r--drivers/hwmon/occ/common.c1251
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");