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