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net: dsa: Add support for reporting switch chip temperatures

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Some switches provide chip temperature data.
Add support for reporting it through the hwmon subsystem.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Guenter Roeck
2014-10-29 10:44:58 -07:00
committed by David S. Miller
parent 2716777b4f
commit 51579c3f1a
3 changed files with 158 additions and 0 deletions
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131
net/dsa/dsa.c
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@@ -9,6 +9,9 @@
* (at your option) any later version.
*/
#include <linux/ctype.h>
#include <linux/device.h>
#include <linux/hwmon.h>
#include <linux/list.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
@@ -17,6 +20,7 @@
#include <linux/of.h>
#include <linux/of_mdio.h>
#include <linux/of_platform.h>
#include <linux/sysfs.h>
#include "dsa_priv.h"
char dsa_driver_version[] = "0.1";
@@ -71,6 +75,104 @@ dsa_switch_probe(struct device *host_dev, int sw_addr, char **_name)
return ret;
}
/* hwmon support ************************************************************/
#ifdef CONFIG_NET_DSA_HWMON
static ssize_t temp1_input_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dsa_switch *ds = dev_get_drvdata(dev);
int temp, ret;
ret = ds->drv->get_temp(ds, &temp);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", temp * 1000);
}
static DEVICE_ATTR_RO(temp1_input);
static ssize_t temp1_max_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dsa_switch *ds = dev_get_drvdata(dev);
int temp, ret;
ret = ds->drv->get_temp_limit(ds, &temp);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", temp * 1000);
}
static ssize_t temp1_max_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct dsa_switch *ds = dev_get_drvdata(dev);
int temp, ret;
ret = kstrtoint(buf, 0, &temp);
if (ret < 0)
return ret;
ret = ds->drv->set_temp_limit(ds, DIV_ROUND_CLOSEST(temp, 1000));
if (ret < 0)
return ret;
return count;
}
static DEVICE_ATTR(temp1_max, S_IRUGO, temp1_max_show, temp1_max_store);
static ssize_t temp1_max_alarm_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dsa_switch *ds = dev_get_drvdata(dev);
bool alarm;
int ret;
ret = ds->drv->get_temp_alarm(ds, &alarm);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", alarm);
}
static DEVICE_ATTR_RO(temp1_max_alarm);
static struct attribute *dsa_hwmon_attrs[] = {
&dev_attr_temp1_input.attr, /* 0 */
&dev_attr_temp1_max.attr, /* 1 */
&dev_attr_temp1_max_alarm.attr, /* 2 */
NULL
};
static umode_t dsa_hwmon_attrs_visible(struct kobject *kobj,
struct attribute *attr, int index)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct dsa_switch *ds = dev_get_drvdata(dev);
struct dsa_switch_driver *drv = ds->drv;
umode_t mode = attr->mode;
if (index == 1) {
if (!drv->get_temp_limit)
mode = 0;
else if (drv->set_temp_limit)
mode |= S_IWUSR;
} else if (index == 2 && !drv->get_temp_alarm) {
mode = 0;
}
return mode;
}
static const struct attribute_group dsa_hwmon_group = {
.attrs = dsa_hwmon_attrs,
.is_visible = dsa_hwmon_attrs_visible,
};
__ATTRIBUTE_GROUPS(dsa_hwmon);
#endif /* CONFIG_NET_DSA_HWMON */
/* basic switch operations **************************************************/
static struct dsa_switch *
@@ -225,6 +327,31 @@ dsa_switch_setup(struct dsa_switch_tree *dst, int index,
ds->ports[i] = slave_dev;
}
#ifdef CONFIG_NET_DSA_HWMON
/* If the switch provides a temperature sensor,
* register with hardware monitoring subsystem.
* Treat registration error as non-fatal and ignore it.
*/
if (drv->get_temp) {
const char *netname = netdev_name(dst->master_netdev);
char hname[IFNAMSIZ + 1];
int i, j;
/* Create valid hwmon 'name' attribute */
for (i = j = 0; i < IFNAMSIZ && netname[i]; i++) {
if (isalnum(netname[i]))
hname[j++] = netname[i];
}
hname[j] = '\0';
scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name), "%s_dsa%d",
hname, index);
ds->hwmon_dev = hwmon_device_register_with_groups(NULL,
ds->hwmon_name, ds, dsa_hwmon_groups);
if (IS_ERR(ds->hwmon_dev))
ds->hwmon_dev = NULL;
}
#endif /* CONFIG_NET_DSA_HWMON */
return ds;
out_free:
@@ -236,6 +363,10 @@ out:
static void dsa_switch_destroy(struct dsa_switch *ds)
{
#ifdef CONFIG_NET_DSA_HWMON
if (ds->hwmon_dev)
hwmon_device_unregister(ds->hwmon_dev);
#endif
}
#ifdef CONFIG_PM_SLEEP