2017-01-07 04:42:00 +07:00
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/*
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* net/dsa/hwmon.c - HWMON subsystem support
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/ctype.h>
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#include <linux/hwmon.h>
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#include <net/dsa.h>
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#include "dsa_priv.h"
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static ssize_t temp1_input_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct dsa_switch *ds = dev_get_drvdata(dev);
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int temp, ret;
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ret = ds->ops->get_temp(ds, &temp);
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if (ret < 0)
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return ret;
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return sprintf(buf, "%d\n", temp * 1000);
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}
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static DEVICE_ATTR_RO(temp1_input);
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static ssize_t temp1_max_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct dsa_switch *ds = dev_get_drvdata(dev);
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int temp, ret;
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ret = ds->ops->get_temp_limit(ds, &temp);
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if (ret < 0)
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return ret;
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return sprintf(buf, "%d\n", temp * 1000);
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}
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static ssize_t temp1_max_store(struct device *dev,
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struct device_attribute *attr, const char *buf,
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size_t count)
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{
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struct dsa_switch *ds = dev_get_drvdata(dev);
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int temp, ret;
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ret = kstrtoint(buf, 0, &temp);
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if (ret < 0)
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return ret;
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ret = ds->ops->set_temp_limit(ds, DIV_ROUND_CLOSEST(temp, 1000));
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if (ret < 0)
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return ret;
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return count;
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}
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static DEVICE_ATTR_RW(temp1_max);
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static ssize_t temp1_max_alarm_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct dsa_switch *ds = dev_get_drvdata(dev);
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bool alarm;
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int ret;
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ret = ds->ops->get_temp_alarm(ds, &alarm);
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if (ret < 0)
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return ret;
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return sprintf(buf, "%d\n", alarm);
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}
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static DEVICE_ATTR_RO(temp1_max_alarm);
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static struct attribute *dsa_hwmon_attrs[] = {
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&dev_attr_temp1_input.attr, /* 0 */
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&dev_attr_temp1_max.attr, /* 1 */
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&dev_attr_temp1_max_alarm.attr, /* 2 */
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NULL
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};
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static umode_t dsa_hwmon_attrs_visible(struct kobject *kobj,
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struct attribute *attr, int index)
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{
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struct device *dev = container_of(kobj, struct device, kobj);
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struct dsa_switch *ds = dev_get_drvdata(dev);
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2017-01-09 05:52:08 +07:00
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const struct dsa_switch_ops *ops = ds->ops;
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2017-01-07 04:42:00 +07:00
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umode_t mode = attr->mode;
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if (index == 1) {
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if (!ops->get_temp_limit)
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mode = 0;
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else if (!ops->set_temp_limit)
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mode &= ~S_IWUSR;
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} else if (index == 2 && !ops->get_temp_alarm) {
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mode = 0;
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}
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return mode;
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}
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static const struct attribute_group dsa_hwmon_group = {
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.attrs = dsa_hwmon_attrs,
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.is_visible = dsa_hwmon_attrs_visible,
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};
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__ATTRIBUTE_GROUPS(dsa_hwmon);
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void dsa_hwmon_register(struct dsa_switch *ds)
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{
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const char *netname = netdev_name(ds->dst->master_netdev);
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char hname[IFNAMSIZ + 1];
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int i, j;
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/* If the switch provides temperature accessors, register with hardware
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* monitoring subsystem. Treat registration error as non-fatal.
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*/
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if (!ds->ops->get_temp)
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return;
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/* Create valid hwmon 'name' attribute */
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for (i = j = 0; i < IFNAMSIZ && netname[i]; i++) {
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if (isalnum(netname[i]))
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hname[j++] = netname[i];
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}
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hname[j] = '\0';
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scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name), "%s_dsa%d", hname,
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ds->index);
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ds->hwmon_dev = hwmon_device_register_with_groups(NULL, ds->hwmon_name,
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ds, dsa_hwmon_groups);
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if (IS_ERR(ds->hwmon_dev)) {
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pr_warn("DSA: failed to register HWMON subsystem for switch %d\n",
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ds->index);
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ds->hwmon_dev = NULL;
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} else {
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pr_info("DSA: registered HWMON subsystem for switch %d\n",
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ds->index);
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}
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}
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void dsa_hwmon_unregister(struct dsa_switch *ds)
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{
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if (ds->hwmon_dev) {
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hwmon_device_unregister(ds->hwmon_dev);
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ds->hwmon_dev = NULL;
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}
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}
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