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