net: dsa: move HWMON support to its own file

Isolate the HWMON support in DSA in its own file. Currently only the
legacy DSA code is concerned.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 147 insertions, 0 deletions

diff --git a/net/dsa/hwmon.c b/net/dsa/hwmon.c
new file mode 100644
index 000000000000..3a9cdf0b22b8
--- /dev/null
+++ b/net/dsa/hwmon.c
@@ -0,0 +1,147 @@
+/*
+ * net/dsa/hwmon.c - HWMON subsystem support
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/ctype.h>
+#include <linux/hwmon.h>
+#include <net/dsa.h>
+
+#include "dsa_priv.h"
+
+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->ops->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->ops->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->ops->set_temp_limit(ds, DIV_ROUND_CLOSEST(temp, 1000));
+	if (ret < 0)
+		return ret;
+
+	return count;
+}
+static DEVICE_ATTR_RW(temp1_max);
+
+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->ops->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_ops *ops = ds->ops;
+	umode_t mode = attr->mode;
+
+	if (index == 1) {
+		if (!ops->get_temp_limit)
+			mode = 0;
+		else if (!ops->set_temp_limit)
+			mode &= ~S_IWUSR;
+	} else if (index == 2 && !ops->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);
+
+void dsa_hwmon_register(struct dsa_switch *ds)
+{
+	const char *netname = netdev_name(ds->dst->master_netdev);
+	char hname[IFNAMSIZ + 1];
+	int i, j;
+
+	/* If the switch provides temperature accessors, register with hardware
+	 * monitoring subsystem. Treat registration error as non-fatal.
+	 */
+	if (!ds->ops->get_temp)
+		return;
+
+	/* 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,
+		  ds->index);
+	ds->hwmon_dev = hwmon_device_register_with_groups(NULL, ds->hwmon_name,
+							  ds, dsa_hwmon_groups);
+	if (IS_ERR(ds->hwmon_dev)) {
+		pr_warn("DSA: failed to register HWMON subsystem for switch %d\n",
+			ds->index);
+		ds->hwmon_dev = NULL;
+	} else {
+		pr_info("DSA: registered HWMON subsystem for switch %d\n",
+			ds->index);
+	}
+}
+
+void dsa_hwmon_unregister(struct dsa_switch *ds)
+{
+	if (ds->hwmon_dev) {
+		hwmon_device_unregister(ds->hwmon_dev);
+		ds->hwmon_dev = NULL;
+	}
+}