target/linux/s3c24xx/files-2.6.31/drivers/misc/gta02_pm_host.c

   1 /*
   2  * Bluetooth PM code for the FIC gta02 GSM Phone
   3  *
   4  * (C) 2007 by Openmoko Inc.
   5  * Author: Harald Welte <laforge@openmoko.org>
   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 version 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
  19 #include <mach/hardware.h>
  20 #include <asm/mach-types.h>
  21
  22 #include <mach/gta02.h>
  23 #include <linux/mfd/pcf50633/gpio.h>
  24
  25 static ssize_t pm_host_read(struct device *dev, struct device_attribute *attr,
  26                             char *buf)
  27 {
  28         return sprintf(buf, "%d\n",
  29                        pcf50633_gpio_get(gta02_pcf, PCF50633_GPO)
  30                                                 == PCF50633_GPOCFG_GPOSEL_1);
  31 }
  32
  33 static ssize_t pm_host_write(struct device *dev, struct device_attribute *attr,
  34                              const char *buf, size_t count)
  35 {
  36         unsigned long on = simple_strtoul(buf, NULL, 10);
  37         u8 val;
  38
  39         if (on)
  40                 val = PCF50633_GPOCFG_GPOSEL_1;
  41         else
  42                 val = PCF50633_GPOCFG_GPOSEL_0;
  43
  44
  45         pcf50633_gpio_set(gta02_pcf, PCF50633_GPO, val);
  46
  47         return count;
  48 }
  49
  50 static DEVICE_ATTR(hostmode, 0644, pm_host_read, pm_host_write);
  51
  52 static struct attribute *gta02_pm_host_sysfs_entries[] = {
  53         &dev_attr_hostmode.attr,
  54         NULL
  55 };
  56
  57 static struct attribute_group gta02_pm_host_attr_group = {
  58         .name   = NULL,
  59         .attrs  = gta02_pm_host_sysfs_entries,
  60 };
  61
  62 static int __init gta02_pm_host_probe(struct platform_device *pdev)
  63 {
  64         dev_info(&pdev->dev, "starting\n");
  65         return sysfs_create_group(&pdev->dev.kobj, &gta02_pm_host_attr_group);
  66 }
  67
  68 static int gta02_pm_host_remove(struct platform_device *pdev)
  69 {
  70         sysfs_remove_group(&pdev->dev.kobj, &gta02_pm_host_attr_group);
  71         return 0;
  72 }
  73
  74 static struct platform_driver gta02_pm_host_driver = {
  75         .probe          = gta02_pm_host_probe,
  76         .remove         = gta02_pm_host_remove,
  77         .driver         = {
  78                 .name           = "gta02-pm-host",
  79         },
  80 };
  81
  82 static int __devinit gta02_pm_host_init(void)
  83 {
  84         return platform_driver_register(&gta02_pm_host_driver);
  85 }
  86
  87 static void gta02_pm_host_exit(void)
  88 {
  89         platform_driver_unregister(&gta02_pm_host_driver);
  90 }
  91
  92 module_init(gta02_pm_host_init);
  93 module_exit(gta02_pm_host_exit);
  94
  95 MODULE_LICENSE("GPL");
  96 MODULE_AUTHOR("Andy Green <andy@openmoko.com>");
  97 MODULE_DESCRIPTION("Openmoko Freerunner USB Host Power Management");