summaryrefslogtreecommitdiff
path: root/drivers/net/can/sysfs.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/net/can/sysfs.c')
-rw-r--r--drivers/net/can/sysfs.c509
1 files changed, 509 insertions, 0 deletions
diff --git a/drivers/net/can/sysfs.c b/drivers/net/can/sysfs.c
new file mode 100644
index 000000000000..746f6410cbeb
--- /dev/null
+++ b/drivers/net/can/sysfs.c
@@ -0,0 +1,509 @@
+/*
+ * Copyright (C) 2007-2008 Wolfgang Grandegger <wg@grandegger.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the version 2 of the GNU General Public License
+ * as published by the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/capability.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <net/sock.h>
+#include <linux/rtnetlink.h>
+
+#include <linux/can.h>
+#include <linux/can/dev.h>
+
+#include "sysfs.h"
+
+#ifdef CONFIG_SYSFS
+
+/*
+ * SYSFS access functions and attributes. Use same locking as
+ * net/core/net-sysfs.c does.
+ */
+static inline int dev_isalive(const struct net_device *dev)
+{
+ return dev->reg_state <= NETREG_REGISTERED;
+}
+
+/* use same locking rules as GIF* ioctl's */
+static ssize_t can_dev_show(struct device *d,
+ struct device_attribute *attr, char *buf,
+ ssize_t (*fmt)(struct net_device *, char *))
+{
+ struct net_device *dev = to_net_dev(d);
+ ssize_t ret = -EINVAL;
+
+ read_lock(&dev_base_lock);
+ if (dev_isalive(dev))
+ ret = (*fmt)(dev, buf);
+ read_unlock(&dev_base_lock);
+
+ return ret;
+}
+
+/* generate a show function for simple field */
+#define CAN_DEV_SHOW(field, fmt_string) \
+static ssize_t fmt_can_##field(struct net_device *dev, char *buf) \
+{ \
+ struct can_priv *priv = netdev_priv(dev); \
+ return sprintf(buf, fmt_string, priv->field); \
+} \
+static ssize_t show_can_##field(struct device *d, \
+ struct device_attribute *attr, \
+ char *buf) \
+{ \
+ return can_dev_show(d, attr, buf, fmt_can_##field); \
+}
+
+/* use same locking and permission rules as SIF* ioctl's */
+static ssize_t can_dev_store(struct device *d, struct device_attribute *attr,
+ const char *buf, size_t len,
+ int (*set)(struct net_device *, unsigned long))
+{
+ struct net_device *dev = to_net_dev(d);
+ unsigned long new;
+ int ret = -EINVAL;
+
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ ret = strict_strtoul(buf, 0, &new);
+ if (ret)
+ goto out;
+
+ rtnl_lock();
+ if (dev_isalive(dev)) {
+ ret = (*set)(dev, new);
+ if (!ret)
+ ret = len;
+ }
+ rtnl_unlock();
+out:
+ return ret;
+}
+
+#define CAN_CREATE_FILE(_dev, _name) \
+ if (device_create_file(&_dev->dev, &dev_attr_##_name)) \
+ dev_err(ND2D(_dev), \
+ "Couldn't create device file for ##_name\n")
+
+#define CAN_REMOVE_FILE(_dev, _name) \
+ device_remove_file(&_dev->dev, &dev_attr_##_name) \
+
+CAN_DEV_SHOW(ctrlmode, "0x%x\n");
+
+static int change_can_ctrlmode(struct net_device *dev, unsigned long ctrlmode)
+{
+ struct can_priv *priv = netdev_priv(dev);
+ int err = 0;
+
+ if (priv->state != CAN_STATE_STOPPED)
+ return -EBUSY;
+
+ if (priv->do_set_ctrlmode)
+ err = priv->do_set_ctrlmode(dev, ctrlmode);
+
+ if (!err)
+ priv->ctrlmode = ctrlmode;
+
+ return err;
+}
+
+static ssize_t store_can_ctrlmode(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ return can_dev_store(dev, attr, buf, len, change_can_ctrlmode);
+}
+
+static DEVICE_ATTR(can_ctrlmode, S_IRUGO | S_IWUSR,
+ show_can_ctrlmode, store_can_ctrlmode);
+
+static const char *can_state_names[] = {
+ "active", "bus-warn", "bus-pass" , "bus-off",
+ "stopped", "sleeping", "unkown"
+};
+
+static ssize_t printf_can_state(struct net_device *dev, char *buf)
+{
+ struct can_priv *priv = netdev_priv(dev);
+ enum can_state state;
+ int err = 0;
+
+ if (priv->do_get_state) {
+ err = priv->do_get_state(dev, &state);
+ if (err)
+ goto out;
+ priv->state = state;
+ } else
+ state = priv->state;
+
+ if (state >= ARRAY_SIZE(can_state_names))
+ state = ARRAY_SIZE(can_state_names) - 1;
+ err = sprintf(buf, "%s\n", can_state_names[state]);
+out:
+ return err;
+}
+
+static ssize_t show_can_state(struct device *d,
+ struct device_attribute *attr, char *buf)
+{
+ return can_dev_show(d, attr, buf, printf_can_state);
+}
+
+static DEVICE_ATTR(can_state, S_IRUGO, show_can_state, NULL);
+
+CAN_DEV_SHOW(restart_ms, "%d\n");
+
+static int change_can_restart_ms(struct net_device *dev, unsigned long ms)
+{
+ struct can_priv *priv = netdev_priv(dev);
+
+ if (priv->restart_ms < 0)
+ return -EOPNOTSUPP;
+ priv->restart_ms = ms;
+ return 0;
+}
+
+static ssize_t store_can_restart_ms(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ return can_dev_store(dev, attr, buf, len, change_can_restart_ms);
+}
+
+static DEVICE_ATTR(can_restart_ms, S_IRUGO | S_IWUSR,
+ show_can_restart_ms, store_can_restart_ms);
+
+static ssize_t printf_can_echo(struct net_device *dev, char *buf)
+{
+ return sprintf(buf, "%d\n", dev->flags & IFF_ECHO ? 1 : 0);
+}
+
+static ssize_t show_can_echo(struct device *d,
+ struct device_attribute *attr, char *buf)
+{
+ return can_dev_show(d, attr, buf, printf_can_echo);
+}
+
+static int change_can_echo(struct net_device *dev, unsigned long on)
+{
+ if (on)
+ dev->flags |= IFF_ECHO;
+ else
+ dev->flags &= ~IFF_ECHO;
+ return 0;
+}
+
+static ssize_t store_can_echo(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ return can_dev_store(dev, attr, buf, len, change_can_echo);
+}
+
+static DEVICE_ATTR(can_echo, S_IRUGO | S_IWUSR, show_can_echo, store_can_echo);
+
+static int change_can_restart(struct net_device *dev, unsigned long on)
+{
+ return can_restart_now(dev);
+}
+
+static ssize_t store_can_restart(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ return can_dev_store(dev, attr, buf, len, change_can_restart);
+}
+
+static DEVICE_ATTR(can_restart, S_IWUSR, NULL, store_can_restart);
+
+/* Show a given attribute if the CAN bittiming group */
+static ssize_t can_btc_show(const struct device *d,
+ struct device_attribute *attr, char *buf,
+ unsigned long offset)
+{
+ struct net_device *dev = to_net_dev(d);
+ struct can_priv *priv = netdev_priv(dev);
+ struct can_bittiming_const *btc = priv->bittiming_const;
+ ssize_t ret = -EINVAL;
+
+ WARN_ON(offset >= sizeof(struct can_bittiming_const) ||
+ offset % sizeof(u32) != 0);
+
+ read_lock(&dev_base_lock);
+ if (dev_isalive(dev) && btc)
+ ret = sprintf(buf, "%d\n",
+ *(u32 *)(((u8 *)btc) + offset));
+
+ read_unlock(&dev_base_lock);
+ return ret;
+}
+
+/* Generate a read-only bittiming const attribute */
+#define CAN_BT_CONST_ENTRY(name) \
+static ssize_t show_##name(struct device *d, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ return can_btc_show(d, attr, buf, \
+ offsetof(struct can_bittiming_const, name));\
+} \
+static DEVICE_ATTR(hw_##name, S_IRUGO, show_##name, NULL)
+
+CAN_BT_CONST_ENTRY(tseg1_min);
+CAN_BT_CONST_ENTRY(tseg1_max);
+CAN_BT_CONST_ENTRY(tseg2_min);
+CAN_BT_CONST_ENTRY(tseg2_max);
+CAN_BT_CONST_ENTRY(sjw_max);
+CAN_BT_CONST_ENTRY(brp_min);
+CAN_BT_CONST_ENTRY(brp_max);
+CAN_BT_CONST_ENTRY(brp_inc);
+
+static ssize_t can_bt_show(const struct device *d,
+ struct device_attribute *attr, char *buf,
+ unsigned long offset)
+{
+ struct net_device *dev = to_net_dev(d);
+ struct can_priv *priv = netdev_priv(dev);
+ struct can_bittiming *bt = &priv->bittiming;
+ ssize_t ret = -EINVAL;
+ u32 *ptr, val;
+
+ WARN_ON(offset >= sizeof(struct can_bittiming) ||
+ offset % sizeof(u32) != 0);
+
+ read_lock(&dev_base_lock);
+ if (dev_isalive(dev)) {
+ ptr = (u32 *)(((u8 *)bt) + offset);
+ if (ptr == &bt->sample_point &&
+ priv->state != CAN_STATE_STOPPED)
+ val = can_sample_point(bt);
+ else
+ val = *ptr;
+ ret = sprintf(buf, "%d\n", val);
+ }
+ read_unlock(&dev_base_lock);
+ return ret;
+}
+
+static ssize_t can_bt_store(const struct device *d,
+ struct device_attribute *attr,
+ const char *buf, size_t count,
+ unsigned long offset)
+{
+ struct net_device *dev = to_net_dev(d);
+ struct can_priv *priv = netdev_priv(dev);
+ struct can_bittiming *bt = &priv->bittiming;
+ unsigned long new;
+ ssize_t ret = -EINVAL;
+ u32 *ptr;
+
+ if (priv->state != CAN_STATE_STOPPED)
+ return -EBUSY;
+
+ WARN_ON(offset >= sizeof(struct can_bittiming) ||
+ offset % sizeof(u32) != 0);
+
+ ret = strict_strtoul(buf, 0, &new);
+ if (ret)
+ goto out;
+
+ ptr = (u32 *)(((u8 *)bt) + offset);
+ rtnl_lock();
+ if (dev_isalive(dev)) {
+ *ptr = (u32)new;
+
+ if ((ptr == &bt->bitrate) || (ptr == &bt->sample_point)) {
+ bt->tq = 0;
+ bt->brp = 0;
+ bt->sjw = 0;
+ bt->prop_seg = 0;
+ bt->phase_seg1 = 0;
+ bt->phase_seg2 = 0;
+ } else {
+ bt->bitrate = 0;
+ bt->sample_point = 0;
+ }
+ ret = count;
+ }
+ rtnl_unlock();
+out:
+ return ret;
+}
+
+#define CAN_BT_ENTRY_RO(name) \
+static ssize_t show_##name(struct device *d, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ return can_bt_show(d, attr, buf, \
+ offsetof(struct can_bittiming, name)); \
+} \
+static DEVICE_ATTR(hw_##name, S_IRUGO, show_##name, NULL)
+
+CAN_BT_ENTRY_RO(clock);
+
+#define CAN_BT_ENTRY(name) \
+static ssize_t show_##name(struct device *d, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ return can_bt_show(d, attr, buf, \
+ offsetof(struct can_bittiming, name)); \
+} \
+static ssize_t store_##name(struct device *d, \
+ struct device_attribute *attr, \
+ const char *buf, size_t count) \
+{ \
+ return can_bt_store(d, attr, buf, count, \
+ offsetof(struct can_bittiming, name)); \
+} \
+static DEVICE_ATTR(name, S_IRUGO | S_IWUSR, show_##name, store_##name)
+
+CAN_BT_ENTRY(bitrate);
+CAN_BT_ENTRY(sample_point);
+CAN_BT_ENTRY(tq);
+CAN_BT_ENTRY(prop_seg);
+CAN_BT_ENTRY(phase_seg1);
+CAN_BT_ENTRY(phase_seg2);
+CAN_BT_ENTRY(sjw);
+
+static struct attribute *can_bittiming_attrs[] = {
+ &dev_attr_hw_tseg1_min.attr,
+ &dev_attr_hw_tseg1_max.attr,
+ &dev_attr_hw_tseg2_max.attr,
+ &dev_attr_hw_tseg2_min.attr,
+ &dev_attr_hw_sjw_max.attr,
+ &dev_attr_hw_brp_min.attr,
+ &dev_attr_hw_brp_max.attr,
+ &dev_attr_hw_brp_inc.attr,
+ &dev_attr_hw_clock.attr,
+ &dev_attr_bitrate.attr,
+ &dev_attr_sample_point.attr,
+ &dev_attr_tq.attr,
+ &dev_attr_prop_seg.attr,
+ &dev_attr_phase_seg1.attr,
+ &dev_attr_phase_seg2.attr,
+ &dev_attr_sjw.attr,
+ NULL
+};
+
+static struct attribute_group can_bittiming_group = {
+ .name = "can_bittiming",
+ .attrs = can_bittiming_attrs,
+};
+
+/* Show a given attribute in the CAN statistics group */
+static ssize_t can_stat_show(const struct device *d,
+ struct device_attribute *attr, char *buf,
+ unsigned long offset)
+{
+ struct net_device *dev = to_net_dev(d);
+ struct can_priv *priv = netdev_priv(dev);
+ struct can_device_stats *stats = &priv->can_stats;
+ ssize_t ret = -EINVAL;
+
+ WARN_ON(offset >= sizeof(struct can_device_stats) ||
+ offset % sizeof(unsigned long) != 0);
+
+ read_lock(&dev_base_lock);
+ if (dev_isalive(dev))
+ ret = sprintf(buf, "%ld\n",
+ *(unsigned long *)(((u8 *)stats) + offset));
+
+ read_unlock(&dev_base_lock);
+ return ret;
+}
+
+/* Generate a read-only CAN statistics attribute */
+#define CAN_STAT_ENTRY(name) \
+static ssize_t show_##name(struct device *d, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ return can_stat_show(d, attr, buf, \
+ offsetof(struct can_device_stats, name)); \
+} \
+static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
+
+CAN_STAT_ENTRY(error_warning);
+CAN_STAT_ENTRY(error_passive);
+CAN_STAT_ENTRY(bus_error);
+CAN_STAT_ENTRY(arbitration_lost);
+CAN_STAT_ENTRY(data_overrun);
+CAN_STAT_ENTRY(wakeup);
+CAN_STAT_ENTRY(restarts);
+
+static struct attribute *can_statistics_attrs[] = {
+ &dev_attr_error_warning.attr,
+ &dev_attr_error_passive.attr,
+ &dev_attr_bus_error.attr,
+ &dev_attr_arbitration_lost.attr,
+ &dev_attr_data_overrun.attr,
+ &dev_attr_wakeup.attr,
+ &dev_attr_restarts.attr,
+ NULL
+};
+
+static struct attribute_group can_statistics_group = {
+ .name = "can_statistics",
+ .attrs = can_statistics_attrs,
+};
+
+void can_create_sysfs(struct net_device *dev)
+{
+ struct can_priv *priv = netdev_priv(dev);
+ int err;
+
+ CAN_CREATE_FILE(dev, can_ctrlmode);
+ CAN_CREATE_FILE(dev, can_echo);
+ CAN_CREATE_FILE(dev, can_restart);
+ CAN_CREATE_FILE(dev, can_state);
+ CAN_CREATE_FILE(dev, can_restart_ms);
+
+ err = sysfs_create_group(&(dev->dev.kobj),
+ &can_statistics_group);
+ if (err) {
+ printk(KERN_EMERG
+ "couldn't create sysfs group for CAN statistics\n");
+ }
+
+ if (priv->bittiming_const) {
+ err = sysfs_create_group(&(dev->dev.kobj),
+ &can_bittiming_group);
+ if (err) {
+ printk(KERN_EMERG "couldn't create sysfs "
+ "group for CAN bittiming\n");
+ }
+ }
+}
+
+void can_remove_sysfs(struct net_device *dev)
+{
+ struct can_priv *priv = netdev_priv(dev);
+
+ CAN_REMOVE_FILE(dev, can_ctrlmode);
+ CAN_REMOVE_FILE(dev, can_echo);
+ CAN_REMOVE_FILE(dev, can_state);
+ CAN_REMOVE_FILE(dev, can_restart);
+ CAN_REMOVE_FILE(dev, can_restart_ms);
+
+ sysfs_remove_group(&(dev->dev.kobj), &can_statistics_group);
+ if (priv->bittiming_const)
+ sysfs_remove_group(&(dev->dev.kobj), &can_bittiming_group);
+}
+
+#endif /* CONFIG_SYSFS */
+
+
+
generated by cgit v1.2.3 (git 2.0.4) at 2024-06-30 00:23:47 +0000