hwmon (occ): Add sensor attributes and register hwmon device
Setup the sensor attributes for every OCC sensor found by the first poll response. Register the attributes with hwmon. Signed-off-by: Eddie James <eajames@linux.ibm.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>hifive-unleashed-5.1
Eddie James
Guenter Roeck
parent
c10e753d43
commit
54076cb3b5
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@ -1,11 +1,13 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/device.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/math64.h>
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#include <linux/mutex.h>
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#include <linux/sysfs.h>
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#include <asm/unaligned.h>
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#include "common.h"
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@ -641,6 +643,324 @@ static ssize_t occ_show_extended(struct device *dev,
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return rc;
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}
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/*
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* Some helper macros to make it easier to define an occ_attribute. Since these
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* are dynamically allocated, we shouldn't use the existing kernel macros which
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* stringify the name argument.
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*/
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#define ATTR_OCC(_name, _mode, _show, _store) { \
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.attr = { \
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.name = _name, \
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.mode = VERIFY_OCTAL_PERMISSIONS(_mode), \
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}, \
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.show = _show, \
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.store = _store, \
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}
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#define SENSOR_ATTR_OCC(_name, _mode, _show, _store, _nr, _index) { \
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.dev_attr = ATTR_OCC(_name, _mode, _show, _store), \
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.index = _index, \
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.nr = _nr, \
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}
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#define OCC_INIT_ATTR(_name, _mode, _show, _store, _nr, _index) \
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((struct sensor_device_attribute_2) \
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SENSOR_ATTR_OCC(_name, _mode, _show, _store, _nr, _index))
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/*
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* Allocate and instatiate sensor_device_attribute_2s. It's most efficient to
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* use our own instead of the built-in hwmon attribute types.
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*/
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static int occ_setup_sensor_attrs(struct occ *occ)
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{
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unsigned int i, s, num_attrs = 0;
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struct device *dev = occ->bus_dev;
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struct occ_sensors *sensors = &occ->sensors;
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struct occ_attribute *attr;
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struct temp_sensor_2 *temp;
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ssize_t (*show_temp)(struct device *, struct device_attribute *,
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char *) = occ_show_temp_1;
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ssize_t (*show_freq)(struct device *, struct device_attribute *,
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char *) = occ_show_freq_1;
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ssize_t (*show_power)(struct device *, struct device_attribute *,
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char *) = occ_show_power_1;
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ssize_t (*show_caps)(struct device *, struct device_attribute *,
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char *) = occ_show_caps_1_2;
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switch (sensors->temp.version) {
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case 1:
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num_attrs += (sensors->temp.num_sensors * 2);
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break;
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case 2:
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num_attrs += (sensors->temp.num_sensors * 4);
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show_temp = occ_show_temp_2;
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break;
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default:
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sensors->temp.num_sensors = 0;
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}
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switch (sensors->freq.version) {
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case 2:
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show_freq = occ_show_freq_2;
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/* fall through */
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case 1:
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num_attrs += (sensors->freq.num_sensors * 2);
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break;
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default:
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sensors->freq.num_sensors = 0;
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}
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switch (sensors->power.version) {
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case 2:
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show_power = occ_show_power_2;
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/* fall through */
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case 1:
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num_attrs += (sensors->power.num_sensors * 4);
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break;
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case 0xA0:
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num_attrs += (sensors->power.num_sensors * 16);
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show_power = occ_show_power_a0;
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break;
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default:
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sensors->power.num_sensors = 0;
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}
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switch (sensors->caps.version) {
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case 1:
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num_attrs += (sensors->caps.num_sensors * 7);
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break;
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case 3:
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show_caps = occ_show_caps_3;
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/* fall through */
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case 2:
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num_attrs += (sensors->caps.num_sensors * 8);
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break;
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default:
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sensors->caps.num_sensors = 0;
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}
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switch (sensors->extended.version) {
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case 1:
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num_attrs += (sensors->extended.num_sensors * 3);
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break;
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default:
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sensors->extended.num_sensors = 0;
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}
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occ->attrs = devm_kzalloc(dev, sizeof(*occ->attrs) * num_attrs,
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GFP_KERNEL);
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if (!occ->attrs)
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return -ENOMEM;
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/* null-terminated list */
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occ->group.attrs = devm_kzalloc(dev, sizeof(*occ->group.attrs) *
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num_attrs + 1, GFP_KERNEL);
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if (!occ->group.attrs)
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return -ENOMEM;
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attr = occ->attrs;
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for (i = 0; i < sensors->temp.num_sensors; ++i) {
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s = i + 1;
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temp = ((struct temp_sensor_2 *)sensors->temp.data) + i;
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snprintf(attr->name, sizeof(attr->name), "temp%d_label", s);
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attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_temp, NULL,
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0, i);
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attr++;
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if (sensors->temp.version > 1 &&
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temp->fru_type == OCC_FRU_TYPE_VRM) {
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snprintf(attr->name, sizeof(attr->name),
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"temp%d_alarm", s);
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} else {
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snprintf(attr->name, sizeof(attr->name),
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"temp%d_input", s);
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}
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attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_temp, NULL,
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1, i);
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attr++;
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if (sensors->temp.version > 1) {
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snprintf(attr->name, sizeof(attr->name),
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"temp%d_fru_type", s);
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attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
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show_temp, NULL, 2, i);
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attr++;
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snprintf(attr->name, sizeof(attr->name),
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"temp%d_fault", s);
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attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
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show_temp, NULL, 3, i);
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attr++;
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}
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}
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for (i = 0; i < sensors->freq.num_sensors; ++i) {
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s = i + 1;
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snprintf(attr->name, sizeof(attr->name), "freq%d_label", s);
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attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_freq, NULL,
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0, i);
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attr++;
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snprintf(attr->name, sizeof(attr->name), "freq%d_input", s);
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attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_freq, NULL,
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1, i);
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attr++;
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}
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if (sensors->power.version == 0xA0) {
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/*
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* Special case for many-attribute power sensor. Split it into
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* a sensor number per power type, emulating several sensors.
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*/
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for (i = 0; i < sensors->power.num_sensors; ++i) {
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unsigned int j;
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unsigned int nr = 0;
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s = (i * 4) + 1;
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for (j = 0; j < 4; ++j) {
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snprintf(attr->name, sizeof(attr->name),
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"power%d_label", s);
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attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
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show_power, NULL,
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nr++, i);
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attr++;
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snprintf(attr->name, sizeof(attr->name),
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"power%d_average", s);
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attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
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show_power, NULL,
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nr++, i);
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attr++;
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snprintf(attr->name, sizeof(attr->name),
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"power%d_average_interval", s);
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attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
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show_power, NULL,
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nr++, i);
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attr++;
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snprintf(attr->name, sizeof(attr->name),
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"power%d_input", s);
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attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
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show_power, NULL,
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nr++, i);
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attr++;
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s++;
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}
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}
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} else {
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for (i = 0; i < sensors->power.num_sensors; ++i) {
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s = i + 1;
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snprintf(attr->name, sizeof(attr->name),
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"power%d_label", s);
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attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
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show_power, NULL, 0, i);
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attr++;
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snprintf(attr->name, sizeof(attr->name),
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"power%d_average", s);
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attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
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show_power, NULL, 1, i);
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attr++;
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snprintf(attr->name, sizeof(attr->name),
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"power%d_average_interval", s);
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attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
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show_power, NULL, 2, i);
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attr++;
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snprintf(attr->name, sizeof(attr->name),
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"power%d_input", s);
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attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
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show_power, NULL, 3, i);
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attr++;
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}
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}
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if (sensors->caps.num_sensors >= 1) {
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s = sensors->power.num_sensors + 1;
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snprintf(attr->name, sizeof(attr->name), "power%d_label", s);
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attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_caps, NULL,
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0, 0);
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attr++;
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snprintf(attr->name, sizeof(attr->name), "power%d_cap", s);
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attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_caps, NULL,
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1, 0);
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attr++;
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snprintf(attr->name, sizeof(attr->name), "power%d_input", s);
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attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_caps, NULL,
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2, 0);
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attr++;
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snprintf(attr->name, sizeof(attr->name),
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"power%d_cap_not_redundant", s);
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attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_caps, NULL,
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3, 0);
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attr++;
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snprintf(attr->name, sizeof(attr->name), "power%d_cap_max", s);
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attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_caps, NULL,
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4, 0);
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attr++;
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snprintf(attr->name, sizeof(attr->name), "power%d_cap_min", s);
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attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_caps, NULL,
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5, 0);
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attr++;
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snprintf(attr->name, sizeof(attr->name), "power%d_cap_user",
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s);
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attr->sensor = OCC_INIT_ATTR(attr->name, 0644, show_caps,
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occ_store_caps_user, 6, 0);
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attr++;
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if (sensors->caps.version > 1) {
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snprintf(attr->name, sizeof(attr->name),
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"power%d_cap_user_source", s);
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attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
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show_caps, NULL, 7, 0);
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attr++;
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}
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}
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for (i = 0; i < sensors->extended.num_sensors; ++i) {
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s = i + 1;
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snprintf(attr->name, sizeof(attr->name), "extn%d_label", s);
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attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
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occ_show_extended, NULL, 0, i);
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attr++;
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snprintf(attr->name, sizeof(attr->name), "extn%d_flags", s);
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attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
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occ_show_extended, NULL, 1, i);
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attr++;
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snprintf(attr->name, sizeof(attr->name), "extn%d_input", s);
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attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
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occ_show_extended, NULL, 2, i);
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attr++;
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}
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/* put the sensors in the group */
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for (i = 0; i < num_attrs; ++i) {
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sysfs_attr_init(&occ->attrs[i].sensor.dev_attr.attr);
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occ->group.attrs[i] = &occ->attrs[i].sensor.dev_attr.attr;
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}
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return 0;
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}
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/* only need to do this once at startup, as OCC won't change sensors on us */
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static void occ_parse_poll_response(struct occ *occ)
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{
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@ -704,6 +1024,7 @@ int occ_setup(struct occ *occ, const char *name)
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int rc;
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mutex_init(&occ->lock);
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occ->groups[0] = &occ->group;
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/* no need to lock */
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rc = occ_poll(occ);
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@ -718,5 +1039,21 @@ int occ_setup(struct occ *occ, const char *name)
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occ_parse_poll_response(occ);
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rc = occ_setup_sensor_attrs(occ);
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if (rc) {
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dev_err(occ->bus_dev, "failed to setup sensor attrs: %d\n",
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rc);
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return rc;
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}
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occ->hwmon = devm_hwmon_device_register_with_groups(occ->bus_dev, name,
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occ, occ->groups);
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if (IS_ERR(occ->hwmon)) {
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rc = PTR_ERR(occ->hwmon);
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dev_err(occ->bus_dev, "failed to register hwmon device: %d\n",
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rc);
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return rc;
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}
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return 0;
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}
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@ -3,7 +3,9 @@
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#ifndef OCC_COMMON_H
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#define OCC_COMMON_H
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#include <linux/hwmon-sysfs.h>
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#include <linux/mutex.h>
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#include <linux/sysfs.h>
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struct device;
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@ -76,6 +78,15 @@ struct occ_sensors {
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struct occ_sensor extended;
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};
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/*
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* Use our own attribute struct so we can dynamically allocate space for the
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* name.
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*/
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struct occ_attribute {
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char name[32];
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struct sensor_device_attribute_2 sensor;
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};
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struct occ {
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struct device *bus_dev;
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@ -88,6 +99,11 @@ struct occ {
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unsigned long last_update;
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struct mutex lock; /* lock OCC access */
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struct device *hwmon;
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struct occ_attribute *attrs;
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struct attribute_group group;
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const struct attribute_group *groups[2];
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};
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int occ_setup(struct occ *occ, const char *name);
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