root/drivers/staging/most/dim2/sysfs.c

DEFINITIONS

1. state_show
2. dim2_sysfs_probe
3. dim2_sysfs_destroy

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * sysfs.c - MediaLB sysfs information
   4  *
   5  * Copyright (C) 2015, Microchip Technology Germany II GmbH & Co. KG
   6  */
   7 
   8 /* Author: Andrey Shvetsov <andrey.shvetsov@k2l.de> */
   9 
  10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11 
  12 #include <linux/kernel.h>
  13 #include "sysfs.h"
  14 #include <linux/device.h>
  15 
  16 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
  17                           char *buf)
  18 {
  19         bool state = dim2_sysfs_get_state_cb();
  20 
  21         return sprintf(buf, "%s\n", state ? "locked" : "");
  22 }
  23 
  24 static DEVICE_ATTR_RO(state);
  25 
  26 static struct attribute *dev_attrs[] = {
  27         &dev_attr_state.attr,
  28         NULL,
  29 };
  30 
  31 static struct attribute_group dev_attr_group = {
  32         .attrs = dev_attrs,
  33 };
  34 
  35 static const struct attribute_group *dev_attr_groups[] = {
  36         &dev_attr_group,
  37         NULL,
  38 };
  39 
  40 int dim2_sysfs_probe(struct device *dev)
  41 {
  42         dev->groups = dev_attr_groups;
  43         return device_register(dev);
  44 }
  45 
  46 void dim2_sysfs_destroy(struct device *dev)
  47 {
  48         device_unregister(dev);
  49 }