path: root/drivers/bluetooth/hci_intel.c

/*
 *
 *  Bluetooth HCI UART driver for Intel devices
 *
 *  Copyright (C) 2015  Intel Corporation
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/wait.h>
#include <linux/tty.h>
#include <linux/platform_device.h>
#include <linux/gpio/consumer.h>
#include <linux/acpi.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>

#include "hci_uart.h"
#include "btintel.h"

#define STATE_BOOTLOADER	0
#define STATE_DOWNLOADING	1
#define STATE_FIRMWARE_LOADED	2
#define STATE_FIRMWARE_FAILED	3
#define STATE_BOOTING		4

struct intel_device {
	struct list_head list;
	struct platform_device *pdev;
	struct gpio_desc *reset;
};

static LIST_HEAD(intel_device_list);
static DEFINE_SPINLOCK(intel_device_list_lock);

struct intel_data {
	struct sk_buff *rx_skb;
	struct sk_buff_head txq;
	unsigned long flags;
};

static u8 intel_convert_speed(unsigned int speed)
{
	switch (speed) {
	case 9600:
		return 0x00;
	case 19200:
		return 0x01;
	case 38400:
		return 0x02;
	case 57600:
		return 0x03;
	case 115200:
		return 0x04;
	case 230400:
		return 0x05;
	case 460800:
		return 0x06;
	case 921600:
		return 0x07;
	case 1843200:
		return 0x08;
	case 3250000:
		return 0x09;
	case 2000000:
		return 0x0a;
	case 3000000:
		return 0x0b;
	default:
		return 0xff;
	}
}

static int intel_wait_booting(struct hci_uart *hu)
{
	struct intel_data *intel = hu->priv;
	int err;

	err = wait_on_bit_timeout(&intel->flags, STATE_BOOTING,
				  TASK_INTERRUPTIBLE,
				  msecs_to_jiffies(1000));

	if (err == 1) {
		BT_ERR("%s: Device boot interrupted", hu->hdev->name);
		return -EINTR;
	}

	if (err) {
		BT_ERR("%s: Device boot timeout", hu->hdev->name);
		return -ETIMEDOUT;
	}

	return err;
}

static int intel_set_power(struct hci_uart *hu, bool powered)
{
	struct list_head *p;
	int err = -ENODEV;

	spin_lock(&intel_device_list_lock);

	list_for_each(p, &intel_device_list) {
		struct intel_device *idev = list_entry(p, struct intel_device,
						       list);

		/* tty device and pdev device should share the same parent
		 * which is the UART port.
		 */
		if (hu->tty->dev->parent != idev->pdev->dev.parent)
			continue;

		if (!idev->reset) {
			err = -ENOTSUPP;
			break;
		}

		BT_INFO("hu %p, Switching compatible pm device (%s) to %u",
			hu, dev_name(&idev->pdev->dev), powered);

		gpiod_set_value(idev->reset, powered);
	}

	spin_unlock(&intel_device_list_lock);

	return err;
}

static int intel_open(struct hci_uart *hu)
{
	struct intel_data *intel;

	BT_DBG("hu %p", hu);

	intel = kzalloc(sizeof(*intel), GFP_KERNEL);
	if (!intel)
		return -ENOMEM;

	skb_queue_head_init(&intel->txq);

	hu->priv = intel;

	if (!intel_set_power(hu, true))
		set_bit(STATE_BOOTING, &intel->flags);

	return 0;
}

static int intel_close(struct hci_uart *hu)
{
	struct intel_data *intel = hu->priv;

	BT_DBG("hu %p", hu);

	intel_set_power(hu, false);

	skb_queue_purge(&intel->txq);
	kfree_skb(intel->rx_skb);
	kfree(intel);

	hu->priv = NULL;
	return 0;
}

static int intel_flush(struct hci_uart *hu)
{
	struct intel_data *intel = hu->priv;

	BT_DBG("hu %p", hu);

	skb_queue_purge(&intel->txq);

	return 0;
}

static int inject_cmd_complete(struct hci_dev *hdev, __u16 opcode)
{
	struct sk_buff *skb;
	struct hci_event_hdr *hdr;
	struct hci_ev_cmd_complete *evt;

	skb = bt_skb_alloc(sizeof(*hdr) + sizeof(*evt) + 1, GFP_ATOMIC);
	if (!skb)
		return -ENOMEM;

	hdr = (struct hci_event_hdr *)skb_put(skb, sizeof(*hdr));
	hdr->evt = HCI_EV_CMD_COMPLETE;
	hdr-&