ipmi: Add a maintenance mode sysfs file

So you can see if it's in maintenance mode and see how long is left.

Signed-off-by: Corey Minyard <corey@minyard.net>
Tested-by: Frederick Lawler <fred@cloudflare.com>

diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index 73d3408..a33d3e2 100644 (file)
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -434,6 +434,7 @@ struct ipmi_smi {
        atomic_t nr_users;
        struct device_attribute nr_users_devattr;
        struct device_attribute nr_msgs_devattr;
+       struct device_attribute maintenance_mode_devattr;
 
 
        /* Used for wake ups at startup. */
@@ -3521,6 +3522,19 @@ static ssize_t nr_msgs_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(nr_msgs);
 
+static ssize_t maintenance_mode_show(struct device *dev,
+                                    struct device_attribute *attr,
+                                    char *buf)
+{
+       struct ipmi_smi *intf = container_of(attr,
+                                            struct ipmi_smi,
+                                            maintenance_mode_devattr);
+
+       return sysfs_emit(buf, "%u %d\n", intf->maintenance_mode_state,
+                         intf->auto_maintenance_timeout);
+}
+static DEVICE_ATTR_RO(maintenance_mode);
+
 static void redo_bmc_reg(struct work_struct *work)
 {
        struct ipmi_smi *intf = container_of(work, struct ipmi_smi,
@@ -3657,6 +3671,14 @@ int ipmi_add_smi(struct module         *owner,
                goto out_err_bmc_reg;
        }
 
+       intf->maintenance_mode_devattr = dev_attr_maintenance_mode;
+       sysfs_attr_init(&intf->maintenance_mode_devattr.attr);
+       rv = device_create_file(intf->si_dev, &intf->maintenance_mode_devattr);
+       if (rv) {
+               device_remove_file(intf->si_dev, &intf->nr_users_devattr);
+               goto out_err_bmc_reg;
+       }
+
        intf->intf_num = i;
        mutex_unlock(&ipmi_interfaces_mutex);
 
@@ -3764,6 +3786,7 @@ void ipmi_unregister_smi(struct ipmi_smi *intf)
        if (intf->handlers->shutdown)
                intf->handlers->shutdown(intf->send_info);
 
+       device_remove_file(intf->si_dev, &intf->maintenance_mode_devattr);
        device_remove_file(intf->si_dev, &intf->nr_msgs_devattr);
        device_remove_file(intf->si_dev, &intf->nr_users_devattr);