target/linux/s3c24xx/files-2.6.31/drivers/misc/gta02_pm_resume_reason.c

   1 /*
   2  * Resume reason sysfs for the Openmoko Freerunner GSM Phone
   3  *
   4  * (C) 2008 by Openmoko Inc.
   5  * Author: Andy Green <andy@openmoko.com>
   6  * All rights reserved.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License resume_reason 2 as
  10  * published by the Free Software Foundation
  11  *
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/kernel.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/io.h>
  19
  20 #include <mach/regs-gpio.h>
  21
  22 static unsigned int *gstatus4_mapped;
  23 static char *resume_reasons[17] = {
  24         "EINT00_ACCEL1",
  25         "EINT01_GSM",
  26         "EINT02_BLUETOOTH",
  27         "EINT03_DEBUGBRD",
  28         "EINT04_JACK",
  29         "EINT05_WLAN",
  30         "EINT06_AUXKEY",
  31         "EINT07_HOLDKEY",
  32         "EINT08_ACCEL2",
  33         "EINT09_PMU",
  34         "EINT10_NULL",
  35         "EINT11_NULL",
  36         "EINT12_GLAMO",
  37         "EINT13_NULL",
  38         "EINT14_NULL",
  39         "EINT15_NULL",
  40         NULL
  41 };
  42
  43 static ssize_t resume_reason_read(struct device *dev,
  44                                   struct device_attribute *attr,
  45                                   char *buf)
  46 {
  47         int bit = 0;
  48         char *end = buf;
  49
  50         for (bit = 0; resume_reasons[bit]; bit++) {
  51                 if ((*gstatus4_mapped) & (1 << bit))
  52                         end += sprintf(end, "* %s\n", resume_reasons[bit]);
  53                 else
  54                         end += sprintf(end, "  %s\n", resume_reasons[bit]);
  55
  56         }
  57
  58         return end - buf;
  59 }
  60
  61
  62 static DEVICE_ATTR(resume_reason, 0644, resume_reason_read, NULL);
  63
  64 static struct attribute *gta02_resume_reason_sysfs_entries[] = {
  65         &dev_attr_resume_reason.attr,
  66         NULL
  67 };
  68
  69 static struct attribute_group gta02_resume_reason_attr_group = {
  70         .name   = NULL,
  71         .attrs  = gta02_resume_reason_sysfs_entries,
  72 };
  73
  74 static int __init gta02_resume_reason_probe(struct platform_device *pdev)
  75 {
  76         dev_info(&pdev->dev, "starting\n");
  77
  78         gstatus4_mapped = ioremap(S3C24XX_GSTATUS4, 0x4);
  79         if (!gstatus4_mapped) {
  80                 dev_err(&pdev->dev, "failed to ioremap() memory region\n");
  81                 return -EINVAL;
  82         }
  83
  84         return sysfs_create_group(&pdev->dev.kobj,
  85                                             &gta02_resume_reason_attr_group);
  86 }
  87
  88 static int gta02_resume_reason_remove(struct platform_device *pdev)
  89 {
  90         sysfs_remove_group(&pdev->dev.kobj, &gta02_resume_reason_attr_group);
  91         iounmap(gstatus4_mapped);
  92         return 0;
  93 }
  94
  95 static struct platform_driver gta02_resume_reason_driver = {
  96         .probe          = gta02_resume_reason_probe,
  97         .remove         = gta02_resume_reason_remove,
  98         .driver         = {
  99                 .name           = "gta02-resume-reason",
 100         },
 101 };
 102
 103 static int __devinit gta02_resume_reason_init(void)
 104 {
 105         return platform_driver_register(&gta02_resume_reason_driver);
 106 }
 107
 108 static void gta02_resume_reason_exit(void)
 109 {
 110         platform_driver_unregister(&gta02_resume_reason_driver);
 111 }
 112
 113 module_init(gta02_resume_reason_init);
 114 module_exit(gta02_resume_reason_exit);
 115
 116 MODULE_LICENSE("GPL");
 117 MODULE_AUTHOR("Andy Green <andy@openmoko.com>");
 118 MODULE_DESCRIPTION("GTA02 resume_reason");