+static ssize_t
+store_shost_state(struct class_device *class_dev, const char *buf, size_t count)
+{
+ int i;
+ struct Scsi_Host *shost = class_to_shost(class_dev);
+ enum scsi_host_state state = 0;
+
+ for (i = 0; i < sizeof(shost_states)/sizeof(shost_states[0]); i++) {
+ const int len = strlen(shost_states[i].name);
+ if (strncmp(shost_states[i].name, buf, len) == 0 &&
+ buf[len] == '\n') {
+ state = shost_states[i].value;
+ break;
+ }
+ }
+ if (!state)
+ return -EINVAL;
+
+ if (scsi_host_set_state(shost, state))
+ return -EINVAL;
+ return count;
+}
+
+static ssize_t
+show_shost_state(struct class_device *class_dev, char *buf)
+{
+ struct Scsi_Host *shost = class_to_shost(class_dev);
+ const char *name = scsi_host_state_name(shost->shost_state);
+
+ if (!name)
+ return -EINVAL;
+
+ return snprintf(buf, 20, "%s\n", name);
+}
+
+static CLASS_DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
+