arch/arm/mach-s3c/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 "gpio-cfg.h"
  17 #include "regs-gpio.h"
  18 #include "gpio-samsung.h"
  19
  20 #include "h1940.h"
  21
  22 #define DRV_NAME "h1940-bt"
  23
  24 /* Bluetooth control */
  25 static void h1940bt_enable(int on)
  26 {
  27         if (on) {
  28                 /* Power on the chip */
  29                 gpio_set_value(H1940_LATCH_BLUETOOTH_POWER, 1);
  30                 /* Reset the chip */
  31                 mdelay(10);
  32
  33                 gpio_set_value(S3C2410_GPH(1), 1);
  34                 mdelay(10);
  35                 gpio_set_value(S3C2410_GPH(1), 0);
  36
  37                 h1940_led_blink_set(NULL, GPIO_LED_BLINK, NULL, NULL);
  38         }
  39         else {
  40                 gpio_set_value(S3C2410_GPH(1), 1);
  41                 mdelay(10);
  42                 gpio_set_value(S3C2410_GPH(1), 0);
  43                 mdelay(10);
  44                 gpio_set_value(H1940_LATCH_BLUETOOTH_POWER, 0);
  45
  46                 h1940_led_blink_set(NULL, GPIO_LED_NO_BLINK_LOW, NULL, NULL);
  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 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         rfk = rfkill_alloc(DRV_NAME, &pdev->dev, RFKILL_TYPE_BLUETOOTH,
  89                         &h1940bt_rfkill_ops, NULL);
  90         if (!rfk) {
  91                 ret = -ENOMEM;
  92                 goto err_rfk_alloc;
  93         }
  94
  95         ret = rfkill_register(rfk);
  96         if (ret)
  97                 goto err_rfkill;
  98
  99         platform_set_drvdata(pdev, rfk);
 100
 101         return 0;
 102
 103 err_rfkill:
 104         rfkill_destroy(rfk);
 105 err_rfk_alloc:
 106         return ret;
 107 }
 108
 109 static int h1940bt_remove(struct platform_device *pdev)
 110 {
 111         struct rfkill *rfk = platform_get_drvdata(pdev);
 112
 113         platform_set_drvdata(pdev, NULL);
 114         gpio_free(S3C2410_GPH(1));
 115
 116         if (rfk) {
 117                 rfkill_unregister(rfk);
 118                 rfkill_destroy(rfk);
 119         }
 120         rfk = NULL;
 121
 122         h1940bt_enable(0);
 123
 124         return 0;
 125 }
 126
 127
 128 static struct platform_driver h1940bt_driver = {
 129         .driver         = {
 130                 .name   = DRV_NAME,
 131         },
 132         .probe          = h1940bt_probe,
 133         .remove         = h1940bt_remove,
 134 };
 135
 136 module_platform_driver(h1940bt_driver);
 137
 138 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
 139 MODULE_DESCRIPTION("Driver for the iPAQ H1940 bluetooth chip");
 140 MODULE_LICENSE("GPL");