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h1940-bluetooth.c

/*
 * arch/arm/mach-s3c2410/h1940-bluetooth.c
 * Copyright (c) Arnaud Patard <arnaud.patard@rtp-net.org>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive for
 * more details.
 *
 *        S3C2410 bluetooth "driver"
 *
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/leds.h>
#include <linux/gpio.h>
#include <linux/rfkill.h>

#include <mach/regs-gpio.h>
#include <mach/hardware.h>
#include <mach/h1940-latch.h>

#define DRV_NAME              "h1940-bt"

/* Bluetooth control */
static void h1940bt_enable(int on)
{
      if (on) {
            /* Power on the chip */
            gpio_set_value(H1940_LATCH_BLUETOOTH_POWER, 1);
            /* Reset the chip */
            mdelay(10);

            gpio_set_value(S3C2410_GPH(1), 1);
            mdelay(10);
            gpio_set_value(S3C2410_GPH(1), 0);
      }
      else {
            gpio_set_value(S3C2410_GPH(1), 1);
            mdelay(10);
            gpio_set_value(S3C2410_GPH(1), 0);
            mdelay(10);
            gpio_set_value(H1940_LATCH_BLUETOOTH_POWER, 0);
      }
}

static int h1940bt_set_block(void *data, bool blocked)
{
      h1940bt_enable(!blocked);
      return 0;
}

static const struct rfkill_ops h1940bt_rfkill_ops = {
      .set_block = h1940bt_set_block,
};

static int __devinit h1940bt_probe(struct platform_device *pdev)
{
      struct rfkill *rfk;
      int ret = 0;

      ret = gpio_request(S3C2410_GPH(1), dev_name(&pdev->dev));
      if (ret) {
            dev_err(&pdev->dev, "could not get GPH1\n");
            return ret;
      }

      ret = gpio_request(H1940_LATCH_BLUETOOTH_POWER, dev_name(&pdev->dev));
      if (ret) {
            gpio_free(S3C2410_GPH(1));
            dev_err(&pdev->dev, "could not get BT_POWER\n");
            return ret;
      }

      /* Configures BT serial port GPIOs */
      s3c_gpio_cfgpin(S3C2410_GPH(0), S3C2410_GPH0_nCTS0);
      s3c_gpio_setpull(S3C2410_GPH(0), S3C_GPIO_PULL_NONE);
      s3c_gpio_cfgpin(S3C2410_GPH(1), S3C2410_GPIO_OUTPUT);
      s3c_gpio_setpull(S3C2410_GPH(1), S3C_GPIO_PULL_NONE);
      s3c_gpio_cfgpin(S3C2410_GPH(2), S3C2410_GPH2_TXD0);
      s3c_gpio_setpull(S3C2410_GPH(2), S3C_GPIO_PULL_NONE);
      s3c_gpio_cfgpin(S3C2410_GPH(3), S3C2410_GPH3_RXD0);
      s3c_gpio_setpull(S3C2410_GPH(3), S3C_GPIO_PULL_NONE);


      rfk = rfkill_alloc(DRV_NAME, &pdev->dev, RFKILL_TYPE_BLUETOOTH,
                  &h1940bt_rfkill_ops, NULL);
      if (!rfk) {
            ret = -ENOMEM;
            goto err_rfk_alloc;
      }

      rfkill_set_led_trigger_name(rfk, "h1940-bluetooth");

      ret = rfkill_register(rfk);
      if (ret)
            goto err_rfkill;

      platform_set_drvdata(pdev, rfk);

      return 0;

err_rfkill:
      rfkill_destroy(rfk);
err_rfk_alloc:
      return ret;
}

static int h1940bt_remove(struct platform_device *pdev)
{
      struct rfkill *rfk = platform_get_drvdata(pdev);

      platform_set_drvdata(pdev, NULL);
      gpio_free(S3C2410_GPH(1));

      if (rfk) {
            rfkill_unregister(rfk);
            rfkill_destroy(rfk);
      }
      rfk = NULL;

      h1940bt_enable(0);

      return 0;
}


static struct platform_driver h1940bt_driver = {
      .driver           = {
            .name = DRV_NAME,
      },
      .probe            = h1940bt_probe,
      .remove           = h1940bt_remove,
};


static int __init h1940bt_init(void)
{
      return platform_driver_register(&h1940bt_driver);
}

static void __exit h1940bt_exit(void)
{
      platform_driver_unregister(&h1940bt_driver);
}

module_init(h1940bt_init);
module_exit(h1940bt_exit);

MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
MODULE_DESCRIPTION("Driver for the iPAQ H1940 bluetooth chip");
MODULE_LICENSE("GPL");

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