arch/arm/mach-pxa/asus730/a730_bt.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License version 2 as
   4  * published by the Free Software Foundation.
   5  */
   6
   7 /*
   8        hciattach /dev/ttyS1 bcsp 921600
   9  */
  10 #include <linux/module.h>
  11 #include <linux/version.h>
  12
  13 #include <linux/init.h>
  14 #include <linux/device.h>
  15 #include <linux/platform_device.h>
  16
  17 #include <asm/arch/hardware.h>
  18 #include <asm/arch/pxa-regs.h>
  19 #include <asm/arch/asus730-gpio.h>
  20
  21 static int enabled = 0;
  22
  23 ssize_t btpwr_show(struct device_driver* drv, char* buf)
  24 {
  25        return sprintf(buf,"%d\n",enabled);
  26 }
  27
  28 ssize_t btpwr_set(struct device_driver* drv, const char* buf, size_t count)
  29 {
  30        int v;
  31
  32        if (sscanf(buf, "%d", &v) != 1 || v == enabled)
  33        {
  34                return count;
  35        }
  36        enabled = v;
  37        printk("changing to %d\n",v);
  38        SET_A730_GPIO(BT_POWER1, enabled);
  39        SET_A730_GPIO(BT_POWER2, enabled);
  40        return count;
  41 }
  42
  43 static DRIVER_ATTR(power, 0644, btpwr_show, btpwr_set);
  44 /* /sys/devices/platform/a730-bt-power/driver/power */
  45
  46 static int bt_probe(struct device *dev)
  47 {
  48        printk("%s %p\n",__PRETTY_FUNCTION__,dev->driver);
  49        return 0;
  50 }
  51
  52 static int bt_resume(struct device *dev)
  53 {
  54 //       if (level != RESUME_ENABLE) return 0;
  55 //       printk("%s lvl=%d\n",__PRETTY_FUNCTION__,level);
  56        return 0;
  57 }
  58
  59 static int bt_remove (struct device * dev) {
  60        printk("%s %p\n",__PRETTY_FUNCTION__,dev->driver);
  61        return 0;
  62 }
  63
  64 static int bt_suspend(struct device *dev, pm_message_t state)
  65 {
  66 //       printk("%s lvl=%d\n",__PRETTY_FUNCTION__,level);
  67        return 0;
  68 }
  69
  70 static void bt_shdn(struct device * dev)
  71 {
  72        printk("%s\n",__PRETTY_FUNCTION__);
  73 }
  74
  75 static void bt_rel (struct device * dev)
  76 {
  77        printk("%s\n",__PRETTY_FUNCTION__);
  78 }
  79
  80 static struct device_driver a730_bt_driver = {
  81        .name           = "a730-bt-power", //driver name
  82        .bus            = &platform_bus_type,
  83        .probe          = bt_probe,
  84        .remove         = bt_remove,
  85        .shutdown       = NULL,
  86 #ifdef CONFIG_PM
  87        .suspend        = bt_suspend,//null, not used
  88        .resume         = bt_resume,
  89 #endif
  90 };
  91
  92 static struct platform_device platform_btpwr = {
  93     .name = "a730-bt-power", //driver name
  94     .id = -1,
  95     .dev = { /* struct device */
  96         .release = bt_rel,//null, not used
  97     },
  98     .num_resources = 0,
  99 };
 100
 101 static int a730_btpwr_init (void)
 102 {
 103        driver_register(&a730_bt_driver);
 104        platform_device_register(&platform_btpwr);
 105        driver_create_file(&a730_bt_driver, &driver_attr_power);
 106        return 0;
 107 }
 108
 109 static void a730_btpwr_exit(void)
 110 {
 111        driver_remove_file(&a730_bt_driver, &driver_attr_power);
 112        platform_device_unregister(&platform_btpwr);//remove device
 113        driver_unregister(&a730_bt_driver); //remove driver
 114 }
 115
 116 module_init(a730_btpwr_init);
 117 module_exit(a730_btpwr_exit);
 118
 119 MODULE_LICENSE("GPL");
 120 MODULE_AUTHOR("Michal Sroczynski <msroczyn@elka.pw.edu.pl>");
 121 MODULE_DESCRIPTION("Bluetooth power control driver for Asus MyPal 730");