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 #include <linux/leds.h>
  22
  23 #include <mach/regs-gpio.h>
  24 #include <mach/hardware.h>
  25 #include <mach/h1940-latch.h>
  26 #include <mach/h1940.h>
  27
  28 #define DRV_NAME "h1940-bt"
  29
  30 /* Bluetooth control */
  31 static void h1940bt_enable(int on)
  32 {
  33         if (on) {
  34                 /* Power on the chip */
  35                 gpio_set_value(H1940_LATCH_BLUETOOTH_POWER, 1);
  36                 /* Reset the chip */
  37                 mdelay(10);
  38
  39                 gpio_set_value(S3C2410_GPH(1), 1);
  40                 mdelay(10);
  41                 gpio_set_value(S3C2410_GPH(1), 0);
  42
  43                 h1940_led_blink_set(-EINVAL, GPIO_LED_BLINK, NULL, NULL);
  44         }
  45         else {
  46                 gpio_set_value(S3C2410_GPH(1), 1);
  47                 mdelay(10);
  48                 gpio_set_value(S3C2410_GPH(1), 0);
  49                 mdelay(10);
  50                 gpio_set_value(H1940_LATCH_BLUETOOTH_POWER, 0);
  51
  52                 h1940_led_blink_set(-EINVAL, GPIO_LED_NO_BLINK_LOW, NULL, NULL);
  53         }
  54 }
  55
  56 static int h1940bt_set_block(void *data, bool blocked)
  57 {
  58         h1940bt_enable(!blocked);
  59         return 0;
  60 }
  61
  62 static const struct rfkill_ops h1940bt_rfkill_ops = {
  63         .set_block = h1940bt_set_block,
  64 };
  65
  66 static int __devinit h1940bt_probe(struct platform_device *pdev)
  67 {
  68         struct rfkill *rfk;
  69         int ret = 0;
  70
  71         ret = gpio_request(S3C2410_GPH(1), dev_name(&pdev->dev));
  72         if (ret) {
  73                 dev_err(&pdev->dev, "could not get GPH1\n");
  74                 return ret;
  75         }
  76
  77         ret = gpio_request(H1940_LATCH_BLUETOOTH_POWER, dev_name(&pdev->dev));
  78         if (ret) {
  79                 gpio_free(S3C2410_GPH(1));
  80                 dev_err(&pdev->dev, "could not get BT_POWER\n");
  81                 return ret;
  82         }
  83
  84         /* Configures BT serial port GPIOs */
  85         s3c_gpio_cfgpin(S3C2410_GPH(0), S3C2410_GPH0_nCTS0);
  86         s3c_gpio_setpull(S3C2410_GPH(0), S3C_GPIO_PULL_NONE);
  87         s3c_gpio_cfgpin(S3C2410_GPH(1), S3C2410_GPIO_OUTPUT);
  88         s3c_gpio_setpull(S3C2410_GPH(1), S3C_GPIO_PULL_NONE);
  89         s3c_gpio_cfgpin(S3C2410_GPH(2), S3C2410_GPH2_TXD0);
  90         s3c_gpio_setpull(S3C2410_GPH(2), S3C_GPIO_PULL_NONE);
  91         s3c_gpio_cfgpin(S3C2410_GPH(3), S3C2410_GPH3_RXD0);
  92         s3c_gpio_setpull(S3C2410_GPH(3), S3C_GPIO_PULL_NONE);
  93
  94         rfk = rfkill_alloc(DRV_NAME, &pdev->dev, RFKILL_TYPE_BLUETOOTH,
  95                         &h1940bt_rfkill_ops, NULL);
  96         if (!rfk) {
  97                 ret = -ENOMEM;
  98                 goto err_rfk_alloc;
  99         }
 100
 101         ret = rfkill_register(rfk);
 102         if (ret)
 103                 goto err_rfkill;
 104
 105         platform_set_drvdata(pdev, rfk);
 106
 107         return 0;
 108
 109 err_rfkill:
 110         rfkill_destroy(rfk);
 111 err_rfk_alloc:
 112         return ret;
 113 }
 114
 115 static int h1940bt_remove(struct platform_device *pdev)
 116 {
 117         struct rfkill *rfk = platform_get_drvdata(pdev);
 118
 119         platform_set_drvdata(pdev, NULL);
 120         gpio_free(S3C2410_GPH(1));
 121
 122         if (rfk) {
 123                 rfkill_unregister(rfk);
 124                 rfkill_destroy(rfk);
 125         }
 126         rfk = NULL;
 127
 128         h1940bt_enable(0);
 129
 130         return 0;
 131 }
 132
 133
 134 static struct platform_driver h1940bt_driver = {
 135         .driver         = {
 136                 .name   = DRV_NAME,
 137         },
 138         .probe          = h1940bt_probe,
 139         .remove         = h1940bt_remove,
 140 };
 141
 142
 143 static int __init h1940bt_init(void)
 144 {
 145         return platform_driver_register(&h1940bt_driver);
 146 }
 147
 148 static void __exit h1940bt_exit(void)
 149 {
 150         platform_driver_unregister(&h1940bt_driver);
 151 }
 152
 153 module_init(h1940bt_init);
 154 module_exit(h1940bt_exit);
 155
 156 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
 157 MODULE_DESCRIPTION("Driver for the iPAQ H1940 bluetooth chip");
 158 MODULE_LICENSE("GPL");