drivers/misc/wl127x-rfkill.c

   1 /*
   2  * Bluetooth TI wl127x rfkill power control via GPIO
   3  *
   4  * Copyright (C) 2009 Motorola, Inc.
   5  * Copyright (C) 2008 Texas Instruments
   6  * Initial code: Pavan Savoy <pavan.savoy@gmail.com> (wl127x_power.c)
   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 as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/gpio.h>
  27 #include <linux/rfkill.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/wl127x-rfkill.h>
  30
  31 static int wl127x_rfkill_set_power(void *data, enum rfkill_state state)
  32 {
  33         int nshutdown_gpio = (int) data;
  34
  35         switch (state) {
  36         case RFKILL_STATE_UNBLOCKED:
  37                 gpio_set_value(nshutdown_gpio, 1);
  38                 break;
  39         case RFKILL_STATE_SOFT_BLOCKED:
  40                 gpio_set_value(nshutdown_gpio, 0);
  41                 break;
  42         default:
  43                 printk(KERN_ERR "invalid bluetooth rfkill state %d\n", state);
  44         }
  45         return 0;
  46 }
  47
  48 static int wl127x_rfkill_probe(struct platform_device *pdev)
  49 {
  50         int rc = 0;
  51         struct wl127x_rfkill_platform_data *pdata = pdev->dev.platform_data;
  52         enum rfkill_state default_state = RFKILL_STATE_SOFT_BLOCKED;  /* off */
  53
  54         rc = gpio_request(pdata->nshutdown_gpio, "wl127x_nshutdown_gpio");
  55         if (unlikely(rc))
  56                 return rc;
  57
  58         rc = gpio_direction_output(pdata->nshutdown_gpio, 0);
  59         if (unlikely(rc))
  60                 return rc;
  61
  62         rfkill_set_default(RFKILL_TYPE_BLUETOOTH, default_state);
  63         wl127x_rfkill_set_power(NULL, default_state);
  64
  65         pdata->rfkill = rfkill_allocate(&pdev->dev, RFKILL_TYPE_BLUETOOTH);
  66         if (unlikely(!pdata->rfkill))
  67                 return -ENOMEM;
  68
  69         pdata->rfkill->name = "wl127x";
  70         pdata->rfkill->state = default_state;
  71         /* userspace cannot take exclusive control */
  72         pdata->rfkill->user_claim_unsupported = 1;
  73         pdata->rfkill->user_claim = 0;
  74         pdata->rfkill->data = (void *) pdata->nshutdown_gpio;
  75         pdata->rfkill->toggle_radio = wl127x_rfkill_set_power;
  76
  77         rc = rfkill_register(pdata->rfkill);
  78
  79         if (unlikely(rc))
  80                 rfkill_free(pdata->rfkill);
  81
  82         return 0;
  83 }
  84
  85 static int wl127x_rfkill_remove(struct platform_device *pdev)
  86 {
  87         struct wl127x_rfkill_platform_data *pdata = pdev->dev.platform_data;
  88
  89         rfkill_unregister(pdata->rfkill);
  90         rfkill_free(pdata->rfkill);
  91         gpio_free(pdata->nshutdown_gpio);
  92
  93         return 0;
  94 }
  95
  96 static struct platform_driver wl127x_rfkill_platform_driver = {
  97         .probe = wl127x_rfkill_probe,
  98         .remove = wl127x_rfkill_remove,
  99         .driver = {
 100                    .name = "wl127x-rfkill",
 101                    .owner = THIS_MODULE,
 102                    },
 103 };
 104
 105 static int __init wl127x_rfkill_init(void)
 106 {
 107         return platform_driver_register(&wl127x_rfkill_platform_driver);
 108 }
 109
 110 static void __exit wl127x_rfkill_exit(void)
 111 {
 112         platform_driver_unregister(&wl127x_rfkill_platform_driver);
 113 }
 114
 115 module_init(wl127x_rfkill_init);
 116 module_exit(wl127x_rfkill_exit);
 117
 118 MODULE_ALIAS("platform:wl127x");
 119 MODULE_DESCRIPTION("wl127x-rfkill");
 120 MODULE_AUTHOR("Motorola");
 121 MODULE_LICENSE("GPL");