drivers/pps/sysfs.c

   1 /*
   2  * PPS sysfs support
   3  *
   4  *
   5  * Copyright (C) 2007-2009   Rodolfo Giometti <giometti@linux.it>
   6  *
   7  *   This program is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU General Public License as published by
   9  *   the Free Software Foundation; either version 2 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This program is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with this program; if not, write to the Free Software
  19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22
  23 #include <linux/device.h>
  24 #include <linux/module.h>
  25 #include <linux/string.h>
  26 #include <linux/pps_kernel.h>
  27
  28 /*
  29  * Attribute functions
  30  */
  31
  32 static ssize_t assert_show(struct device *dev, struct device_attribute *attr,
  33                            char *buf)
  34 {
  35         struct pps_device *pps = dev_get_drvdata(dev);
  36
  37         if (!(pps->info.mode & PPS_CAPTUREASSERT))
  38                 return 0;
  39
  40         return sprintf(buf, "%lld.%09d#%d\n",
  41                         (long long) pps->assert_tu.sec, pps->assert_tu.nsec,
  42                         pps->assert_sequence);
  43 }
  44 static DEVICE_ATTR_RO(assert);
  45
  46 static ssize_t clear_show(struct device *dev, struct device_attribute *attr,
  47                           char *buf)
  48 {
  49         struct pps_device *pps = dev_get_drvdata(dev);
  50
  51         if (!(pps->info.mode & PPS_CAPTURECLEAR))
  52                 return 0;
  53
  54         return sprintf(buf, "%lld.%09d#%d\n",
  55                         (long long) pps->clear_tu.sec, pps->clear_tu.nsec,
  56                         pps->clear_sequence);
  57 }
  58 static DEVICE_ATTR_RO(clear);
  59
  60 static ssize_t mode_show(struct device *dev, struct device_attribute *attr,
  61                          char *buf)
  62 {
  63         struct pps_device *pps = dev_get_drvdata(dev);
  64
  65         return sprintf(buf, "%4x\n", pps->info.mode);
  66 }
  67 static DEVICE_ATTR_RO(mode);
  68
  69 static ssize_t echo_show(struct device *dev, struct device_attribute *attr,
  70                          char *buf)
  71 {
  72         struct pps_device *pps = dev_get_drvdata(dev);
  73
  74         return sprintf(buf, "%d\n", !!pps->info.echo);
  75 }
  76 static DEVICE_ATTR_RO(echo);
  77
  78 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
  79                          char *buf)
  80 {
  81         struct pps_device *pps = dev_get_drvdata(dev);
  82
  83         return sprintf(buf, "%s\n", pps->info.name);
  84 }
  85 static DEVICE_ATTR_RO(name);
  86
  87 static ssize_t path_show(struct device *dev, struct device_attribute *attr,
  88                          char *buf)
  89 {
  90         struct pps_device *pps = dev_get_drvdata(dev);
  91
  92         return sprintf(buf, "%s\n", pps->info.path);
  93 }
  94 static DEVICE_ATTR_RO(path);
  95
  96 static struct attribute *pps_attrs[] = {
  97         &dev_attr_assert.attr,
  98         &dev_attr_clear.attr,
  99         &dev_attr_mode.attr,
 100         &dev_attr_echo.attr,
 101         &dev_attr_name.attr,
 102         &dev_attr_path.attr,
 103         NULL,
 104 };
 105
 106 static const struct attribute_group pps_group = {
 107         .attrs = pps_attrs,
 108 };
 109
 110 const struct attribute_group *pps_groups[] = {
 111         &pps_group,
 112         NULL,
 113 };