LXR linux/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 */
  26static 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
  51static int h1940bt_set_block(void *data, bool blocked)
  52{
  53        h1940bt_enable(!blocked);
  54        return 0;
  55}
  56
  57static const struct rfkill_ops h1940bt_rfkill_ops = {
  58        .set_block = h1940bt_set_block,
  59};
  60
  61static 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
 104err_rfkill:
 105        rfkill_destroy(rfk);
 106err_rfk_alloc:
 107        return ret;
 108}
 109
 110static 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
 129static struct platform_driver h1940bt_driver = {
 130        .driver         = {
 131                .name   = DRV_NAME,
 132        },
 133        .probe          = h1940bt_probe,
 134        .remove         = h1940bt_remove,
 135};
 136
 137module_platform_driver(h1940bt_driver);
 138
 139MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
 140MODULE_DESCRIPTION("Driver for the iPAQ H1940 bluetooth chip");
 141MODULE_LICENSE("GPL");
 142