arch/arm/mach-s3c24xx/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/hardware.h>
  23 #include <mach/regs-gpio.h>
  24
  25 #include "h1940.h"
  26
  27 #define DRV_NAME "h1940-bt"
  28
  29 /* Bluetooth control */
  30 static void h1940bt_enable(int on)
  31 {
  32         if (on) {
  33                 /* Power on the chip */
  34                 gpio_set_value(H1940_LATCH_BLUETOOTH_POWER, 1);
  35                 /* Reset the chip */
  36                 mdelay(10);
  37
  38                 gpio_set_value(S3C2410_GPH(1), 1);
  39                 mdelay(10);
  40                 gpio_set_value(S3C2410_GPH(1), 0);
  41
  42                 h1940_led_blink_set(-EINVAL, GPIO_LED_BLINK, NULL, NULL);
  43         }
  44         else {
  45                 gpio_set_value(S3C2410_GPH(1), 1);
  46                 mdelay(10);
  47                 gpio_set_value(S3C2410_GPH(1), 0);
  48                 mdelay(10);
  49                 gpio_set_value(H1940_LATCH_BLUETOOTH_POWER, 0);
  50
  51                 h1940_led_blink_set(-EINVAL, GPIO_LED_NO_BLINK_LOW, NULL, NULL);
  52         }
  53 }
  54
  55 static int h1940bt_set_block(void *data, bool blocked)
  56 {
  57         h1940bt_enable(!blocked);
  58         return 0;
  59 }
  60
  61 static const struct rfkill_ops h1940bt_rfkill_ops = {
  62         .set_block = h1940bt_set_block,
  63 };
  64
  65 static int h1940bt_probe(struct platform_device *pdev)
  66 {
  67         struct rfkill *rfk;
  68         int ret = 0;
  69
  70         ret = gpio_request(S3C2410_GPH(1), dev_name(&pdev->dev));
  71         if (ret) {
  72                 dev_err(&pdev->dev, "could not get GPH1\n");
  73                 return ret;
  74         }
  75
  76         ret = gpio_request(H1940_LATCH_BLUETOOTH_POWER, dev_name(&pdev->dev));
  77         if (ret) {
  78                 gpio_free(S3C2410_GPH(1));
  79                 dev_err(&pdev->dev, "could not get BT_POWER\n");
  80                 return ret;
  81         }
  82
  83         /* Configures BT serial port GPIOs */
  84         s3c_gpio_cfgpin(S3C2410_GPH(0), S3C2410_GPH0_nCTS0);
  85         s3c_gpio_setpull(S3C2410_GPH(0), S3C_GPIO_PULL_NONE);
  86         s3c_gpio_cfgpin(S3C2410_GPH(1), S3C2410_GPIO_OUTPUT);
  87         s3c_gpio_setpull(S3C2410_GPH(1), S3C_GPIO_PULL_NONE);
  88         s3c_gpio_cfgpin(S3C2410_GPH(2), S3C2410_GPH2_TXD0);
  89         s3c_gpio_setpull(S3C2410_GPH(2), S3C_GPIO_PULL_NONE);
  90         s3c_gpio_cfgpin(S3C2410_GPH(3), S3C2410_GPH3_RXD0);
  91         s3c_gpio_setpull(S3C2410_GPH(3), S3C_GPIO_PULL_NONE);
  92
  93         rfk = rfkill_alloc(DRV_NAME, &pdev->dev, RFKILL_TYPE_BLUETOOTH,
  94                         &h1940bt_rfkill_ops, NULL);
  95         if (!rfk) {
  96                 ret = -ENOMEM;
  97                 goto err_rfk_alloc;
  98         }
  99
 100         ret = rfkill_register(rfk);
 101         if (ret)
 102                 goto err_rfkill;
 103
 104         platform_set_drvdata(pdev, rfk);
 105
 106         return 0;
 107
 108 err_rfkill:
 109         rfkill_destroy(rfk);
 110 err_rfk_alloc:
 111         return ret;
 112 }
 113
 114 static int h1940bt_remove(struct platform_device *pdev)
 115 {
 116         struct rfkill *rfk = platform_get_drvdata(pdev);
 117
 118         platform_set_drvdata(pdev, NULL);
 119         gpio_free(S3C2410_GPH(1));
 120
 121         if (rfk) {
 122                 rfkill_unregister(rfk);
 123                 rfkill_destroy(rfk);
 124         }
 125         rfk = NULL;
 126
 127         h1940bt_enable(0);
 128
 129         return 0;
 130 }
 131
 132
 133 static struct platform_driver h1940bt_driver = {
 134         .driver         = {
 135                 .name   = DRV_NAME,
 136         },
 137         .probe          = h1940bt_probe,
 138         .remove         = h1940bt_remove,
 139 };
 140
 141 module_platform_driver(h1940bt_driver);
 142
 143 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
 144 MODULE_DESCRIPTION("Driver for the iPAQ H1940 bluetooth chip");
 145 MODULE_LICENSE("GPL");