arch/arm/mach-s3c2410/h1940-bluetooth.c

   1 /*
   2  * arch/arm/mach-s3c2410/h1940-bluetooth.c
   3  * Copyright (c) Arnaud Patard <arnaud.patard@rtp-net.org>
   4  *
   5  * This file is subject to the terms and conditions of the GNU General Public
   6  * License.  See the file COPYING in the main directory of this archive for
   7  * more details.
   8  *
   9  *          S3C2410 bluetooth "driver"
  10  *
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/delay.h>
  16 #include <linux/string.h>
  17 #include <linux/ctype.h>
  18 #include <linux/leds.h>
  19 #include <linux/gpio.h>
  20 #include <linux/rfkill.h>
  21
  22 #include <mach/regs-gpio.h>
  23 #include <mach/hardware.h>
  24 #include <mach/h1940-latch.h>
  25
  26 #define DRV_NAME              "h1940-bt"
  27
  28 /* Bluetooth control */
  29 static void h1940bt_enable(int on)
  30 {
  31         if (on) {
  32                 /* Power on the chip */
  33                 h1940_latch_control(0, H1940_LATCH_BLUETOOTH_POWER);
  34                 /* Reset the chip */
  35                 mdelay(10);
  36                 s3c2410_gpio_setpin(S3C2410_GPH(1), 1);
  37                 mdelay(10);
  38                 s3c2410_gpio_setpin(S3C2410_GPH(1), 0);
  39         }
  40         else {
  41                 s3c2410_gpio_setpin(S3C2410_GPH(1), 1);
  42                 mdelay(10);
  43                 s3c2410_gpio_setpin(S3C2410_GPH(1), 0);
  44                 mdelay(10);
  45                 h1940_latch_control(H1940_LATCH_BLUETOOTH_POWER, 0);
  46         }
  47 }
  48
  49 static int h1940bt_set_block(void *data, bool blocked)
  50 {
  51         h1940bt_enable(!blocked);
  52         return 0;
  53 }
  54
  55 static const struct rfkill_ops h1940bt_rfkill_ops = {
  56         .set_block = h1940bt_set_block,
  57 };
  58
  59 static int __init h1940bt_probe(struct platform_device *pdev)
  60 {
  61         struct rfkill *rfk;
  62         int ret = 0;
  63
  64         /* Configures BT serial port GPIOs */
  65         s3c2410_gpio_cfgpin(S3C2410_GPH(0), S3C2410_GPH0_nCTS0);
  66         s3c2410_gpio_pullup(S3C2410_GPH(0), 1);
  67         s3c2410_gpio_cfgpin(S3C2410_GPH(1), S3C2410_GPIO_OUTPUT);
  68         s3c2410_gpio_pullup(S3C2410_GPH(1), 1);
  69         s3c2410_gpio_cfgpin(S3C2410_GPH(2), S3C2410_GPH2_TXD0);
  70         s3c2410_gpio_pullup(S3C2410_GPH(2), 1);
  71         s3c2410_gpio_cfgpin(S3C2410_GPH(3), S3C2410_GPH3_RXD0);
  72         s3c2410_gpio_pullup(S3C2410_GPH(3), 1);
  73
  74
  75         rfk = rfkill_alloc(DRV_NAME, &pdev->dev, RFKILL_TYPE_BLUETOOTH,
  76                         &h1940bt_rfkill_ops, NULL);
  77         if (!rfk) {
  78                 ret = -ENOMEM;
  79                 goto err_rfk_alloc;
  80         }
  81
  82         rfkill_set_led_trigger_name(rfk, "h1940-bluetooth");
  83
  84         ret = rfkill_register(rfk);
  85         if (ret)
  86                 goto err_rfkill;
  87
  88         platform_set_drvdata(pdev, rfk);
  89
  90         return 0;
  91
  92 err_rfkill:
  93         rfkill_destroy(rfk);
  94 err_rfk_alloc:
  95         return ret;
  96 }
  97
  98 static int h1940bt_remove(struct platform_device *pdev)
  99 {
 100         struct rfkill *rfk = platform_get_drvdata(pdev);
 101
 102         platform_set_drvdata(pdev, NULL);
 103
 104         if (rfk) {
 105                 rfkill_unregister(rfk);
 106                 rfkill_destroy(rfk);
 107         }
 108         rfk = NULL;
 109
 110         h1940bt_enable(0);
 111
 112         return 0;
 113 }
 114
 115
 116 static struct platform_driver h1940bt_driver = {
 117         .driver         = {
 118                 .name   = DRV_NAME,
 119         },
 120         .probe          = h1940bt_probe,
 121         .remove         = h1940bt_remove,
 122 };
 123
 124
 125 static int __init h1940bt_init(void)
 126 {
 127         return platform_driver_register(&h1940bt_driver);
 128 }
 129
 130 static void __exit h1940bt_exit(void)
 131 {
 132         platform_driver_unregister(&h1940bt_driver);
 133 }
 134
 135 module_init(h1940bt_init);
 136 module_exit(h1940bt_exit);
 137
 138 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
 139 MODULE_DESCRIPTION("Driver for the iPAQ H1940 bluetooth chip");
 140 MODULE_LICENSE("GPL");