arch/arm/mach-s3c24xx/h1940-bluetooth.c

   1 // SPDX-License-Identifier: GPL-1.0
   2 //
   3 // Copyright (c) Arnaud Patard <arnaud.patard@rtp-net.org>
   4 //
   5 //          S3C2410 bluetooth "driver"
   6
   7 #include <linux/module.h>
   8 #include <linux/platform_device.h>
   9 #include <linux/delay.h>
  10 #include <linux/string.h>
  11 #include <linux/ctype.h>
  12 #include <linux/leds.h>
  13 #include <linux/gpio.h>
  14 #include <linux/rfkill.h>
  15
  16 #include <plat/gpio-cfg.h>
  17 #include <mach/hardware.h>
  18 #include <mach/regs-gpio.h>
  19 #include <mach/gpio-samsung.h>
  20
  21 #include "h1940.h"
  22
  23 #define DRV_NAME "h1940-bt"
  24
  25 /* Bluetooth control */
  26 static void h1940bt_enable(int on)
  27 {
  28         if (on) {
  29                 /* Power on the chip */
  30                 gpio_set_value(H1940_LATCH_BLUETOOTH_POWER, 1);
  31                 /* Reset the chip */
  32                 mdelay(10);
  33
  34                 gpio_set_value(S3C2410_GPH(1), 1);
  35                 mdelay(10);
  36                 gpio_set_value(S3C2410_GPH(1), 0);
  37
  38                 h1940_led_blink_set(NULL, GPIO_LED_BLINK, NULL, NULL);
  39         }
  40         else {
  41                 gpio_set_value(S3C2410_GPH(1), 1);
  42                 mdelay(10);
  43                 gpio_set_value(S3C2410_GPH(1), 0);
  44                 mdelay(10);
  45                 gpio_set_value(H1940_LATCH_BLUETOOTH_POWER, 0);
  46
  47                 h1940_led_blink_set(NULL, GPIO_LED_NO_BLINK_LOW, NULL, NULL);
  48         }
  49 }
  50
  51 static int h1940bt_set_block(void *data, bool blocked)
  52 {
  53         h1940bt_enable(!blocked);
  54         return 0;
  55 }
  56
  57 static const struct rfkill_ops h1940bt_rfkill_ops = {
  58         .set_block = h1940bt_set_block,
  59 };
  60
  61 static int h1940bt_probe(struct platform_device *pdev)
  62 {
  63         struct rfkill *rfk;
  64         int ret = 0;
  65
  66         ret = gpio_request(S3C2410_GPH(1), dev_name(&pdev->dev));
  67         if (ret) {
  68                 dev_err(&pdev->dev, "could not get GPH1\n");
  69                 return ret;
  70         }
  71
  72         ret = gpio_request(H1940_LATCH_BLUETOOTH_POWER, dev_name(&pdev->dev));
  73         if (ret) {
  74                 gpio_free(S3C2410_GPH(1));
  75                 dev_err(&pdev->dev, "could not get BT_POWER\n");
  76                 return ret;
  77         }
  78
  79         /* Configures BT serial port GPIOs */
  80         s3c_gpio_cfgpin(S3C2410_GPH(0), S3C2410_GPH0_nCTS0);
  81         s3c_gpio_setpull(S3C2410_GPH(0), S3C_GPIO_PULL_NONE);
  82         s3c_gpio_cfgpin(S3C2410_GPH(1), S3C2410_GPIO_OUTPUT);
  83         s3c_gpio_setpull(S3C2410_GPH(1), S3C_GPIO_PULL_NONE);
  84         s3c_gpio_cfgpin(S3C2410_GPH(2), S3C2410_GPH2_TXD0);
  85         s3c_gpio_setpull(S3C2410_GPH(2), S3C_GPIO_PULL_NONE);
  86         s3c_gpio_cfgpin(S3C2410_GPH(3), S3C2410_GPH3_RXD0);
  87         s3c_gpio_setpull(S3C2410_GPH(3), S3C_GPIO_PULL_NONE);
  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         ret = rfkill_register(rfk);
  97         if (ret)
  98                 goto err_rfkill;
  99
 100         platform_set_drvdata(pdev, rfk);
 101
 102         return 0;
 103
 104 err_rfkill:
 105         rfkill_destroy(rfk);
 106 err_rfk_alloc:
 107         return ret;
 108 }
 109
 110 static int h1940bt_remove(struct platform_device *pdev)
 111 {
 112         struct rfkill *rfk = platform_get_drvdata(pdev);
 113
 114         platform_set_drvdata(pdev, NULL);
 115         gpio_free(S3C2410_GPH(1));
 116
 117         if (rfk) {
 118                 rfkill_unregister(rfk);
 119                 rfkill_destroy(rfk);
 120         }
 121         rfk = NULL;
 122
 123         h1940bt_enable(0);
 124
 125         return 0;
 126 }
 127
 128
 129 static struct platform_driver h1940bt_driver = {
 130         .driver         = {
 131                 .name   = DRV_NAME,
 132         },
 133         .probe          = h1940bt_probe,
 134         .remove         = h1940bt_remove,
 135 };
 136
 137 module_platform_driver(h1940bt_driver);
 138
 139 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
 140 MODULE_DESCRIPTION("Driver for the iPAQ H1940 bluetooth chip");
 141 MODULE_LICENSE("GPL");