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                 gpio_set_value(H1940_LATCH_BLUETOOTH_POWER, 1);
  34                 /* Reset the chip */
  35                 mdelay(10);
  36
  37                 gpio_set_value(S3C2410_GPH(1), 1);
  38                 mdelay(10);
  39                 gpio_set_value(S3C2410_GPH(1), 0);
  40         }
  41         else {
  42                 gpio_set_value(S3C2410_GPH(1), 1);
  43                 mdelay(10);
  44                 gpio_set_value(S3C2410_GPH(1), 0);
  45                 mdelay(10);
  46                 gpio_set_value(H1940_LATCH_BLUETOOTH_POWER, 0);
  47         }
  48 }
  49
  50 static int h1940bt_set_block(void *data, bool blocked)
  51 {
  52         h1940bt_enable(!blocked);
  53         return 0;
  54 }
  55
  56 static const struct rfkill_ops h1940bt_rfkill_ops = {
  57         .set_block = h1940bt_set_block,
  58 };
  59
  60 static int __devinit h1940bt_probe(struct platform_device *pdev)
  61 {
  62         struct rfkill *rfk;
  63         int ret = 0;
  64
  65         ret = gpio_request(S3C2410_GPH(1), dev_name(&pdev->dev));
  66         if (ret) {
  67                 dev_err(&pdev->dev, "could not get GPH1\n");
  68                 return ret;
  69         }
  70
  71         ret = gpio_request(H1940_LATCH_BLUETOOTH_POWER, dev_name(&pdev->dev));
  72         if (ret) {
  73                 gpio_free(S3C2410_GPH(1));
  74                 dev_err(&pdev->dev, "could not get BT_POWER\n");
  75                 return ret;
  76         }
  77
  78         /* Configures BT serial port GPIOs */
  79         s3c_gpio_cfgpin(S3C2410_GPH(0), S3C2410_GPH0_nCTS0);
  80         s3c_gpio_setpull(S3C2410_GPH(0), S3C_GPIO_PULL_NONE);
  81         s3c_gpio_cfgpin(S3C2410_GPH(1), S3C2410_GPIO_OUTPUT);
  82         s3c_gpio_setpull(S3C2410_GPH(1), S3C_GPIO_PULL_NONE);
  83         s3c_gpio_cfgpin(S3C2410_GPH(2), S3C2410_GPH2_TXD0);
  84         s3c_gpio_setpull(S3C2410_GPH(2), S3C_GPIO_PULL_NONE);
  85         s3c_gpio_cfgpin(S3C2410_GPH(3), S3C2410_GPH3_RXD0);
  86         s3c_gpio_setpull(S3C2410_GPH(3), S3C_GPIO_PULL_NONE);
  87
  88
  89         rfk = rfkill_alloc(DRV_NAME, &pdev->dev, RFKILL_TYPE_BLUETOOTH,
  90                         &h1940bt_rfkill_ops, NULL);
  91         if (!rfk) {
  92                 ret = -ENOMEM;
  93                 goto err_rfk_alloc;
  94         }
  95
  96         rfkill_set_led_trigger_name(rfk, "h1940-bluetooth");
  97
  98         ret = rfkill_register(rfk);
  99         if (ret)
 100                 goto err_rfkill;
 101
 102         platform_set_drvdata(pdev, rfk);
 103
 104         return 0;
 105
 106 err_rfkill:
 107         rfkill_destroy(rfk);
 108 err_rfk_alloc:
 109         return ret;
 110 }
 111
 112 static int h1940bt_remove(struct platform_device *pdev)
 113 {
 114         struct rfkill *rfk = platform_get_drvdata(pdev);
 115
 116         platform_set_drvdata(pdev, NULL);
 117         gpio_free(S3C2410_GPH(1));
 118
 119         if (rfk) {
 120                 rfkill_unregister(rfk);
 121                 rfkill_destroy(rfk);
 122         }
 123         rfk = NULL;
 124
 125         h1940bt_enable(0);
 126
 127         return 0;
 128 }
 129
 130
 131 static struct platform_driver h1940bt_driver = {
 132         .driver         = {
 133                 .name   = DRV_NAME,
 134         },
 135         .probe          = h1940bt_probe,
 136         .remove         = h1940bt_remove,
 137 };
 138
 139
 140 static int __init h1940bt_init(void)
 141 {
 142         return platform_driver_register(&h1940bt_driver);
 143 }
 144
 145 static void __exit h1940bt_exit(void)
 146 {
 147         platform_driver_unregister(&h1940bt_driver);
 148 }
 149
 150 module_init(h1940bt_init);
 151 module_exit(h1940bt_exit);
 152
 153 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
 154 MODULE_DESCRIPTION("Driver for the iPAQ H1940 bluetooth chip");
 155 MODULE_LICENSE("GPL");