LXR linux/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 */
  25static 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
  50static int h1940bt_set_block(void *data, bool blocked)
  51{
  52        h1940bt_enable(!blocked);
  53        return 0;
  54}
  55
  56static const struct rfkill_ops h1940bt_rfkill_ops = {
  57        .set_block = h1940bt_set_block,
  58};
  59
  60static 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
 103err_rfkill:
 104        rfkill_destroy(rfk);
 105err_rfk_alloc:
 106        return ret;
 107}
 108
 109static 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
 128static struct platform_driver h1940bt_driver = {
 129        .driver         = {
 130                .name   = DRV_NAME,
 131        },
 132        .probe          = h1940bt_probe,
 133        .remove         = h1940bt_remove,
 134};
 135
 136module_platform_driver(h1940bt_driver);
 137
 138MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
 139MODULE_DESCRIPTION("Driver for the iPAQ H1940 bluetooth chip");
 140MODULE_LICENSE("GPL");
 141