LXR linux/arch/arm/mach-s3c24xx/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
  22#include <plat/gpio-cfg.h>
  23#include <mach/hardware.h>
  24#include <mach/regs-gpio.h>
  25#include <mach/gpio-samsung.h>
  26
  27#include "h1940.h"
  28
  29#define DRV_NAME "h1940-bt"
  30
  31/* Bluetooth control */
  32static void h1940bt_enable(int on)
  33{
  34        if (on) {
  35                /* Power on the chip */
  36                gpio_set_value(H1940_LATCH_BLUETOOTH_POWER, 1);
  37                /* Reset the chip */
  38                mdelay(10);
  39
  40                gpio_set_value(S3C2410_GPH(1), 1);
  41                mdelay(10);
  42                gpio_set_value(S3C2410_GPH(1), 0);
  43
  44                h1940_led_blink_set(NULL, GPIO_LED_BLINK, NULL, NULL);
  45        }
  46        else {
  47                gpio_set_value(S3C2410_GPH(1), 1);
  48                mdelay(10);
  49                gpio_set_value(S3C2410_GPH(1), 0);
  50                mdelay(10);
  51                gpio_set_value(H1940_LATCH_BLUETOOTH_POWER, 0);
  52
  53                h1940_led_blink_set(NULL, GPIO_LED_NO_BLINK_LOW, NULL, NULL);
  54        }
  55}
  56
  57static int h1940bt_set_block(void *data, bool blocked)
  58{
  59        h1940bt_enable(!blocked);
  60        return 0;
  61}
  62
  63static const struct rfkill_ops h1940bt_rfkill_ops = {
  64        .set_block = h1940bt_set_block,
  65};
  66
  67static int h1940bt_probe(struct platform_device *pdev)
  68{
  69        struct rfkill *rfk;
  70        int ret = 0;
  71
  72        ret = gpio_request(S3C2410_GPH(1), dev_name(&pdev->dev));
  73        if (ret) {
  74                dev_err(&pdev->dev, "could not get GPH1\n");
  75                return ret;
  76        }
  77
  78        ret = gpio_request(H1940_LATCH_BLUETOOTH_POWER, dev_name(&pdev->dev));
  79        if (ret) {
  80                gpio_free(S3C2410_GPH(1));
  81                dev_err(&pdev->dev, "could not get BT_POWER\n");
  82                return ret;
  83        }
  84
  85        /* Configures BT serial port GPIOs */
  86        s3c_gpio_cfgpin(S3C2410_GPH(0), S3C2410_GPH0_nCTS0);
  87        s3c_gpio_setpull(S3C2410_GPH(0), S3C_GPIO_PULL_NONE);
  88        s3c_gpio_cfgpin(S3C2410_GPH(1), S3C2410_GPIO_OUTPUT);
  89        s3c_gpio_setpull(S3C2410_GPH(1), S3C_GPIO_PULL_NONE);
  90        s3c_gpio_cfgpin(S3C2410_GPH(2), S3C2410_GPH2_TXD0);
  91        s3c_gpio_setpull(S3C2410_GPH(2), S3C_GPIO_PULL_NONE);
  92        s3c_gpio_cfgpin(S3C2410_GPH(3), S3C2410_GPH3_RXD0);
  93        s3c_gpio_setpull(S3C2410_GPH(3), S3C_GPIO_PULL_NONE);
  94
  95        rfk = rfkill_alloc(DRV_NAME, &pdev->dev, RFKILL_TYPE_BLUETOOTH,
  96                        &h1940bt_rfkill_ops, NULL);
  97        if (!rfk) {
  98                ret = -ENOMEM;
  99                goto err_rfk_alloc;
 100        }
 101
 102        ret = rfkill_register(rfk);
 103        if (ret)
 104                goto err_rfkill;
 105
 106        platform_set_drvdata(pdev, rfk);
 107
 108        return 0;
 109
 110err_rfkill:
 111        rfkill_destroy(rfk);
 112err_rfk_alloc:
 113        return ret;
 114}
 115
 116static int h1940bt_remove(struct platform_device *pdev)
 117{
 118        struct rfkill *rfk = platform_get_drvdata(pdev);
 119
 120        platform_set_drvdata(pdev, NULL);
 121        gpio_free(S3C2410_GPH(1));
 122
 123        if (rfk) {
 124                rfkill_unregister(rfk);
 125                rfkill_destroy(rfk);
 126        }
 127        rfk = NULL;
 128
 129        h1940bt_enable(0);
 130
 131        return 0;
 132}
 133
 134
 135static struct platform_driver h1940bt_driver = {
 136        .driver         = {
 137                .name   = DRV_NAME,
 138        },
 139        .probe          = h1940bt_probe,
 140        .remove         = h1940bt_remove,
 141};
 142
 143module_platform_driver(h1940bt_driver);
 144
 145MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
 146MODULE_DESCRIPTION("Driver for the iPAQ H1940 bluetooth chip");
 147MODULE_LICENSE("GPL");
 148