release/src-rt-6.x.4708/linux/linux-2.6.36/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 pps_show_assert(struct device *dev,
  33                                 struct device_attribute *attr, 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
  45 static ssize_t pps_show_clear(struct device *dev,
  46                                 struct device_attribute *attr, char *buf)
  47 {
  48         struct pps_device *pps = dev_get_drvdata(dev);
  49
  50         if (!(pps->info.mode & PPS_CAPTURECLEAR))
  51                 return 0;
  52
  53         return sprintf(buf, "%lld.%09d#%d\n",
  54                         (long long) pps->clear_tu.sec, pps->clear_tu.nsec,
  55                         pps->clear_sequence);
  56 }
  57
  58 static ssize_t pps_show_mode(struct device *dev,
  59                                 struct device_attribute *attr, char *buf)
  60 {
  61         struct pps_device *pps = dev_get_drvdata(dev);
  62
  63         return sprintf(buf, "%4x\n", pps->info.mode);
  64 }
  65
  66 static ssize_t pps_show_echo(struct device *dev,
  67                                 struct device_attribute *attr, char *buf)
  68 {
  69         struct pps_device *pps = dev_get_drvdata(dev);
  70
  71         return sprintf(buf, "%d\n", !!pps->info.echo);
  72 }
  73
  74 static ssize_t pps_show_name(struct device *dev,
  75                                 struct device_attribute *attr, char *buf)
  76 {
  77         struct pps_device *pps = dev_get_drvdata(dev);
  78
  79         return sprintf(buf, "%s\n", pps->info.name);
  80 }
  81
  82 static ssize_t pps_show_path(struct device *dev,
  83                                 struct device_attribute *attr, char *buf)
  84 {
  85         struct pps_device *pps = dev_get_drvdata(dev);
  86
  87         return sprintf(buf, "%s\n", pps->info.path);
  88 }
  89
  90 struct device_attribute pps_attrs[] = {
  91         __ATTR(assert, S_IRUGO, pps_show_assert, NULL),
  92         __ATTR(clear, S_IRUGO, pps_show_clear, NULL),
  93         __ATTR(mode, S_IRUGO, pps_show_mode, NULL),
  94         __ATTR(echo, S_IRUGO, pps_show_echo, NULL),
  95         __ATTR(name, S_IRUGO, pps_show_name, NULL),
  96         __ATTR(path, S_IRUGO, pps_show_path, NULL),
  97         __ATTR_NULL,
  98 };