drivers/power/gta01_battery.c

   1 /*
   2  * Battery driver for the Openmoko GTA01 device, using the pcf50606 chip.
   3  *
   4  * This is nothing more than a write-thru interface to the real logic,
   5  * which is part of the pcf50606.c multifunction chip driver.
   6  *      Copyright © 2008  Mike Westerhof <mwester@dls.net>
   7  *
   8  *
   9  * Portions liberally borrowed from olpc_battery.c, copyright below:
  10  *      Copyright © 2006  David Woodhouse <dwmw2@infradead.org>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/err.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/power_supply.h>
  21 #include <linux/jiffies.h>
  22 #include <linux/sched.h>
  23
  24 /*********************************************************************
  25  * This global is set by the pcf50606 driver to the correct callback
  26  *********************************************************************/
  27
  28 extern int (*pmu_bat_get_property)(struct power_supply *,
  29                                    enum power_supply_property,
  30                                    union power_supply_propval *);
  31
  32
  33 /*********************************************************************
  34  *              Battery properties
  35  *********************************************************************/
  36 static int gta01_bat_get_property(struct power_supply *psy,
  37                                   enum power_supply_property psp,
  38                                   union power_supply_propval *val)
  39 {
  40         if (pmu_bat_get_property)
  41                 return (pmu_bat_get_property)(psy, psp, val);
  42         else
  43                 return -ENODEV;
  44 }
  45
  46 static enum power_supply_property gta01_bat_props[] = {
  47         POWER_SUPPLY_PROP_STATUS,
  48         POWER_SUPPLY_PROP_PRESENT,
  49         POWER_SUPPLY_PROP_ONLINE,
  50         POWER_SUPPLY_PROP_VOLTAGE_NOW,
  51         POWER_SUPPLY_PROP_CURRENT_NOW,
  52         POWER_SUPPLY_PROP_TEMP,
  53         POWER_SUPPLY_PROP_CAPACITY,
  54 };
  55
  56 /*********************************************************************
  57  *              Initialisation
  58  *********************************************************************/
  59
  60 static struct platform_device *bat_pdev;
  61
  62 static struct power_supply gta01_bat = {
  63         .properties = gta01_bat_props,
  64         .num_properties = ARRAY_SIZE(gta01_bat_props),
  65         .get_property = gta01_bat_get_property,
  66         .use_for_apm = 0,  /* pcf50606 driver has its own apm driver */
  67 };
  68
  69 static int __init gta01_bat_init(void)
  70 {
  71         int ret;
  72
  73         bat_pdev = platform_device_register_simple("gta01-battery", 0, NULL, 0);
  74         if (IS_ERR(bat_pdev))
  75                 return PTR_ERR(bat_pdev);
  76
  77         gta01_bat.name = bat_pdev->name;
  78
  79         ret = power_supply_register(&bat_pdev->dev, &gta01_bat);
  80         if (ret)
  81                 platform_device_unregister(bat_pdev);
  82
  83         return ret;
  84 }
  85
  86 static void __exit gta01_bat_exit(void)
  87 {
  88         power_supply_unregister(&gta01_bat);
  89         platform_device_unregister(bat_pdev);
  90 }
  91
  92 module_init(gta01_bat_init);
  93 module_exit(gta01_bat_exit);
  94
  95 MODULE_AUTHOR("Mike Westerhof <mwester@dls.net>");
  96 MODULE_LICENSE("GPL");
  97 MODULE_DESCRIPTION("Battery driver for GTA01");