diff options
Diffstat (limited to 'net')
| -rw-r--r-- | net/dsa/Kconfig | 11 | ||||
| -rw-r--r-- | net/dsa/dsa.c | 131 |
2 files changed, 142 insertions, 0 deletions
diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig index a585fd6352eb..5f8ac404535b 100644 --- a/net/dsa/Kconfig +++ b/net/dsa/Kconfig @@ -11,6 +11,17 @@ config NET_DSA if NET_DSA +config NET_DSA_HWMON + bool "Distributed Switch Architecture HWMON support" + default y + depends on HWMON && !(NET_DSA=y && HWMON=m) + ---help--- + Say Y if you want to expose thermal sensor data on switches supported + by the Distributed Switch Architecture. + + Some of those switches contain thermal sensors. This data is available + via the hwmon sysfs interface and exposes the onboard sensors. + # tagging formats config NET_DSA_TAG_BRCM bool diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c index 22f34cf4cb27..5edbbca89f1f 100644 --- a/net/dsa/dsa.c +++ b/net/dsa/dsa.c @@ -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 |