[deliverable/linux.git] / drivers / bluetooth / hci_bcm.c

/*
 *
 *  Bluetooth HCI UART driver for Broadcom 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/acpi.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/gpio/consumer.h>
#include <linux/tty.h>

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

#include "btbcm.h"
#include "hci_uart.h"

struct bcm_device {
	struct list_head	list;

	struct platform_device	*pdev;

	const char		*name;
	struct gpio_desc	*device_wakeup;
	struct gpio_desc	*shutdown;

	struct clk		*clk;
	bool			clk_enabled;

	u32			init_speed;

#ifdef CONFIG_PM_SLEEP
	struct hci_uart		*hu;
	bool			is_suspended; /* suspend/resume flag */
#endif
};

struct bcm_data {
	struct sk_buff		*rx_skb;
	struct sk_buff_head	txq;

	struct bcm_device	*dev;
};

/* List of BCM BT UART devices */
static DEFINE_SPINLOCK(bcm_device_lock);
static LIST_HEAD(bcm_device_list);

static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed)
{
	struct hci_dev *hdev = hu->hdev;
	struct sk_buff *skb;
	struct bcm_update_uart_baud_rate param;

	if (speed > 3000000) {
		struct bcm_write_uart_clock_setting clock;

		clock.type = BCM_UART_CLOCK_48MHZ;

		BT_DBG("%s: Set Controller clock (%d)", hdev->name, clock.type);

		/* This Broadcom specific command changes the UART's controller
		 * clock for baud rate > 3000000.
		 */
		skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT);
		if (IS_ERR(skb)) {
			int err = PTR_ERR(skb);
			BT_ERR("%s: BCM: failed to write clock command (%d)",
			       hdev->name, err);
			return err;
		}

		kfree_skb(skb);
	}

	BT_DBG("%s: Set Controller UART speed to %d bit/s", hdev->name, speed);

	param.zero = cpu_to_le16(0);
	param.baud_rate = cpu_to_le32(speed);

	/* This Broadcom specific command changes the UART's controller baud
	 * rate.
	 */
	skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), &param,
			     HCI_INIT_TIMEOUT);
	if (IS_ERR(skb)) {
		int err = PTR_ERR(skb);
		BT_ERR("%s: BCM: failed to write update baudrate command (%d)",
		       hdev->name, err);
		return err;
	}

	kfree_skb(skb);

	return 0;
}

/* bcm_device_exists should be protected by bcm_device_lock */
static bool bcm_device_exists(struct bcm_device *device)
{
	struct list_head *p;

	list_for_each(p, &bcm_device_list) {
		struct bcm_device *dev = list_entry(p, struct bcm_device, list);

		if (device == dev)
			return true;
	}

	return false;
}

static int bcm_gpio_set_power(struct bcm_device *dev, bool powered)
{
	if (powered && !IS_ERR(dev->clk) && !dev->clk_enabled)
		clk_enable(dev->clk);

	gpiod_set_value(dev->shutdown, powered);
	gpiod_set_value(dev->device_wakeup, powered);

	if (!powered && !IS_ERR(dev->clk) && dev->clk_enabled)
		clk_disable(dev->clk);

	dev->clk_enabled = powered;

	return 0;
}

static int bcm_open(struct hci_uart *hu)
{
	struct bcm_data *bcm;
	struct list_head *p;

	BT_DBG("hu %p", hu);

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

	skb_queue_head_init(&bcm->txq);

	hu->priv = bcm;

	spin_lock(&bcm_device_lock);
	list_for_each(p, &bcm_device_list) {
		struct bcm_device *dev = list_entry(p, struct bcm_device, list);

		/* Retrieve saved bcm_device based on parent of the
		 * platform device (saved during device probe) and
		 * parent of tty device used by hci_uart
		 */
		if (hu->tty->dev->parent == dev->pdev->dev.parent) {
			bcm->dev = dev;
			hu->init_speed = dev->init_speed;
#ifdef CONFIG_PM_SLEEP
			dev->hu = hu;
#endif
			break;
		}
	}

	if (bcm->dev)
		bcm_gpio_set_power(bcm->dev, true);

	spin_unlock(&bcm_device_lock);

	return 0;
}

static int bcm_close(struct hci_uart *hu)
{
	struct bcm_data *bcm = hu->priv;

	BT_DBG("hu %p", hu);

	/* Protect bcm->dev against removal of the device or driver */
	spin_lock(&bcm_device_lock);
	if (bcm_device_exists(bcm->dev)) {
		bcm_gpio_set_power(bcm->dev, false);
#ifdef CONFIG_PM_SLEEP
		bcm->dev->hu = NULL;
#endif
	}
	spin_unlock(&bcm_device_lock);

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

	hu->priv = NULL;
	return 0;
}

static int bcm_flush(struct hci_uart *hu)
{
	struct bcm_data *bcm = hu->priv;

	BT_DBG("hu %p", hu);

	skb_queue_purge(&bcm->txq);

	return 0;
}

static int bcm_setup(struct hci_uart *hu)
{
	char fw_name[64];
	const struct firmware *fw;
	unsigned int speed;
	int err;

	BT_DBG("hu %p", hu);

	hu->hdev->set_bdaddr = btbcm_set_bdaddr;

	err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name));
	if (err)
		return err;

	err = request_firmware(&fw, fw_name, &hu->hdev->dev);
	if (err < 0) {
		BT_INFO("%s: BCM: Patch %s not found", hu->hdev->name, fw_name);
		return 0;
	}

	err = btbcm_patchram(hu->hdev, fw);
	if (err) {
		BT_INFO("%s: BCM: Patch failed (%d)", hu->hdev->name, err);
		goto finalize;
	}

	/* Init speed if any */
	if (hu->init_speed)
		speed = hu->init_speed;
	else if (hu->proto->init_speed)
		speed = hu->proto->init_speed;
	else
		speed = 0;

	if (speed)
		hci_uart_set_baudrate(hu, speed);

	/* Operational speed if any */
	if (hu->oper_speed)
		speed = hu->oper_speed;
	else if (hu->proto->oper_speed)
		speed = hu->proto->oper_speed;
	else
		speed = 0;

	if (speed) {
		err = bcm_set_baudrate(hu, speed);
		if (!err)
			hci_uart_set_baudrate(hu, speed);
	}

finalize:
	release_firmware(fw);

	err = btbcm_finalize(hu->hdev);

	return err;
}

static const struct h4_recv_pkt bcm_recv_pkts[] = {
	{ H4_RECV_ACL,   .recv = hci_recv_frame },
	{ H4_RECV_SCO,   .recv = hci_recv_frame },
	{ H4_RECV_EVENT, .recv = hci_recv_frame },
};

static int bcm_recv(struct hci_uart *hu, const void *data, int count)
{
	struct bcm_data *bcm = hu->priv;

	if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
		return -EUNATCH;

	bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
				  bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
	if (IS_ERR(bcm->rx_skb)) {
		int err = PTR_ERR(bcm->rx_skb);
		BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err);
		bcm->rx_skb = NULL;
		return err;
	}

	return count;
}

static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
{
	struct bcm_data *bcm = hu->priv;

	BT_DBG("hu %p skb %p", hu, skb);

	/* Prepend skb with frame type */
	memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
	skb_queue_tail(&bcm->txq, skb);

	return 0;
}

static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
{
	struct bcm_data *bcm = hu->priv;

	return skb_dequeue(&bcm->txq);
}

#ifdef CONFIG_PM_SLEEP
/* Platform suspend callback */
static int bcm_suspend(struct device *dev)
{
	struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));

	BT_DBG("suspend (%p): is_suspended %d", bdev, bdev->is_suspended);

	spin_lock(&bcm_device_lock);

	if (!bdev->hu)
		goto unlock;

	if (!bdev->is_suspended) {
		hci_uart_set_flow_control(bdev->hu, true);

		/* Once this callback returns, driver suspends BT via GPIO */
		bdev->is_suspended = true;
	}

	/* Suspend the device */
	if (bdev->device_wakeup) {
		gpiod_set_value(bdev->device_wakeup, false);
		BT_DBG("suspend, delaying 15 ms");
		mdelay(15);
	}

unlock:
	spin_unlock(&bcm_device_lock);

	return 0;
}

/* Platform resume callback */
static int bcm_resume(struct device *dev)
{
	struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));

	BT_DBG("resume (%p): is_suspended %d", bdev, bdev->is_suspended);

	spin_lock(&bcm_device_lock);

	if (!bdev->hu)
		goto unlock;

	if (bdev->device_wakeup) {
		gpiod_set_value(bdev->device_wakeup, true);
		BT_DBG("resume, delaying 15 ms");
		mdelay(15);
	}

	/* When this callback executes, the device has woken up already */
	if (bdev->is_suspended) {
		bdev->is_suspended = false;

		hci_uart_set_flow_control(bdev->hu, false);
	}

unlock:
	spin_unlock(&bcm_device_lock);

	return 0;
}
#endif

static const struct acpi_gpio_params device_wakeup_gpios = { 0, 0, false };
static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false };

static const struct acpi_gpio_mapping acpi_bcm_default_gpios[] = {
	{ "device-wakeup-gpios", &device_wakeup_gpios, 1 },
	{ "shutdown-gpios", &shutdown_gpios, 1 },
	{ },
};

#ifdef CONFIG_ACPI
static int bcm_resource(struct acpi_resource *ares, void *data)
{
	struct bcm_device *dev = data;

	if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {
		struct acpi_resource_uart_serialbus *sb;

		sb = &ares->data.uart_serial_bus;
		if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART)
			dev->init_speed = sb->default_baud_rate;
	}

	/* Always tell the ACPI core to skip this resource */
	return 1;
}

static int bcm_acpi_probe(struct bcm_device *dev)
{
	struct platform_device *pdev = dev->pdev;
	const struct acpi_device_id *id;
	struct acpi_device *adev;
	LIST_HEAD(resources);
	int ret;

	id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
	if (!id)
		return -ENODEV;

	/* Retrieve GPIO data */
	dev->name = dev_name(&pdev->dev);
	ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(&pdev->dev),
					acpi_bcm_default_gpios);
	if (ret)
		return ret;

	dev->clk = devm_clk_get(&pdev->dev, NULL);

	dev->device_wakeup = devm_gpiod_get_optional(&pdev->dev,
						     "device-wakeup",
						     GPIOD_OUT_LOW);
	if (IS_ERR(dev->device_wakeup))
		return PTR_ERR(dev->device_wakeup);

	dev->shutdown = devm_gpiod_get_optional(&pdev->dev, "shutdown",
						GPIOD_OUT_LOW);
	if (IS_ERR(dev->shutdown))
		return PTR_ERR(dev->shutdown);

	/* Make sure at-least one of the GPIO is defined and that
	 * a name is specified for this instance
	 */
	if ((!dev->device_wakeup && !dev->shutdown) || !dev->name) {
		dev_err(&pdev->dev, "invalid platform data\n");
		return -EINVAL;
	}

	/* Retrieve UART ACPI info */
	adev = ACPI_COMPANION(&dev->pdev->dev);
	if (!adev)
		return 0;

	acpi_dev_get_resources(adev, &resources, bcm_resource, dev);

	return 0;
}
#else
static int bcm_acpi_probe(struct bcm_device *dev)
{
	return -EINVAL;
}
#endif /* CONFIG_ACPI */

static int bcm_probe(struct platform_device *pdev)
{
	struct bcm_device *dev;
	struct acpi_device_id *pdata = pdev->dev.platform_data;
	int ret;

	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
	if (!dev)
		return -ENOMEM;

	dev->pdev = pdev;

	if (ACPI_HANDLE(&pdev->dev)) {
		ret = bcm_acpi_probe(dev);
		if (ret)
			return ret;
	} else if (pdata) {
		dev->name = pdata->id;
	} else {
		return -ENODEV;
	}

	platform_set_drvdata(pdev, dev);

	dev_info(&pdev->dev, "%s device registered.\n", dev->name);

	/* Place this instance on the device list */
	spin_lock(&bcm_device_lock);
	list_add_tail(&dev->list, &bcm_device_list);
	spin_unlock(&bcm_device_lock);

	bcm_gpio_set_power(dev, false);

	return 0;
}

static int bcm_remove(struct platform_device *pdev)
{
	struct bcm_device *dev = platform_get_drvdata(pdev);

	spin_lock(&bcm_device_lock);
	list_del(&dev->list);
	spin_unlock(&bcm_device_lock);

	acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->dev));

	dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);

	return 0;
}

static const struct hci_uart_proto bcm_proto = {
	.id		= HCI_UART_BCM,
	.name		= "BCM",
	.init_speed	= 115200,
	.oper_speed	= 4000000,
	.open		= bcm_open,
	.close		= bcm_close,
	.flush		= bcm_flush,
	.setup		= bcm_setup,
	.set_baudrate	= bcm_set_baudrate,
	.recv		= bcm_recv,
	.enqueue	= bcm_enqueue,
	.dequeue	= bcm_dequeue,
};

#ifdef CONFIG_ACPI
static const struct acpi_device_id bcm_acpi_match[] = {
	{ "BCM2E39", 0 },
	{ "BCM2E67", 0 },
	{ },
};
MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
#endif

/* Platform suspend and resume callbacks */
static SIMPLE_DEV_PM_OPS(bcm_pm_ops, bcm_suspend, bcm_resume);

static struct platform_driver bcm_driver = {
	.probe = bcm_probe,
	.remove = bcm_remove,
	.driver = {
		.name = "hci_bcm",
		.acpi_match_table = ACPI_PTR(bcm_acpi_match),
		.pm = &bcm_pm_ops,
	},
};

int __init bcm_init(void)
{
	platform_driver_register(&bcm_driver);

	return hci_uart_register_proto(&bcm_proto);
}

int __exit bcm_deinit(void)
{
	platform_driver_unregister(&bcm_driver);

	return hci_uart_unregister_proto(&bcm_proto);
}
Commit	Line	Data
e9a2dd26 MH	1	/*
	2	*
	3	* Bluetooth HCI UART driver for Broadcom devices
	4	*
	5	* Copyright (C) 2015 Intel Corporation
	6	*
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	21	*
	22	*/
	23
	24	#include <linux/kernel.h>
	25	#include <linux/errno.h>
	26	#include <linux/skbuff.h>
18aeb444	27	#include <linux/firmware.h>
0395ffc1 FD	28	#include <linux/module.h>
	29	#include <linux/acpi.h>
	30	#include <linux/platform_device.h>
	31	#include <linux/clk.h>
	32	#include <linux/gpio/consumer.h>
	33	#include <linux/tty.h>
e9a2dd26 MH	34
	35	#include <net/bluetooth/bluetooth.h>
	36	#include <net/bluetooth/hci_core.h>
	37
bdd8818e	38	#include "btbcm.h"
e9a2dd26	39	#include "hci_uart.h"
bdd8818e	40
0395ffc1 FD	41	struct bcm_device {
	42	struct list_head list;
	43
	44	struct platform_device *pdev;
	45
	46	const char *name;
	47	struct gpio_desc *device_wakeup;
	48	struct gpio_desc *shutdown;
	49
	50	struct clk *clk;
	51	bool clk_enabled;
ae056908 FD	52
ae056908 FD	53	u32 init_speed;
118612fb FD	54
	55	#ifdef CONFIG_PM_SLEEP
	56	struct hci_uart *hu;
	57	bool is_suspended; /* suspend/resume flag */
	58	#endif
0395ffc1 FD	59	};
0395ffc1 FD	60
bdd8818e	61	struct bcm_data {
0395ffc1 FD	62	struct sk_buff *rx_skb;
	63	struct sk_buff_head txq;
	64
	65	struct bcm_device *dev;
bdd8818e MH	66	};
bdd8818e MH	67
0395ffc1	68	/* List of BCM BT UART devices */
917522aa	69	static DEFINE_SPINLOCK(bcm_device_lock);
0395ffc1 FD	70	static LIST_HEAD(bcm_device_list);
0395ffc1 FD	71
61b2fc2b FD	72	static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed)
	73	{
	74	struct hci_dev *hdev = hu->hdev;
	75	struct sk_buff *skb;
	76	struct bcm_update_uart_baud_rate param;
	77
	78	if (speed > 3000000) {
	79	struct bcm_write_uart_clock_setting clock;
	80
	81	clock.type = BCM_UART_CLOCK_48MHZ;
	82
	83	BT_DBG("%s: Set Controller clock (%d)", hdev->name, clock.type);
	84
	85	/* This Broadcom specific command changes the UART's controller
	86	* clock for baud rate > 3000000.
	87	*/
	88	skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT);
	89	if (IS_ERR(skb)) {
	90	int err = PTR_ERR(skb);
	91	BT_ERR("%s: BCM: failed to write clock command (%d)",
	92	hdev->name, err);
	93	return err;
	94	}
	95
	96	kfree_skb(skb);
	97	}
	98
	99	BT_DBG("%s: Set Controller UART speed to %d bit/s", hdev->name, speed);
	100
	101	param.zero = cpu_to_le16(0);
	102	param.baud_rate = cpu_to_le32(speed);
	103
	104	/* This Broadcom specific command changes the UART's controller baud
	105	* rate.
	106	*/
	107	skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), &param,
	108	HCI_INIT_TIMEOUT);
	109	if (IS_ERR(skb)) {
	110	int err = PTR_ERR(skb);
	111	BT_ERR("%s: BCM: failed to write update baudrate command (%d)",
	112	hdev->name, err);
	113	return err;
	114	}
	115
	116	kfree_skb(skb);
	117
	118	return 0;
	119	}
	120
917522aa	121	/* bcm_device_exists should be protected by bcm_device_lock */
0395ffc1 FD	122	static bool bcm_device_exists(struct bcm_device *device)
	123	{
	124	struct list_head *p;
	125
	126	list_for_each(p, &bcm_device_list) {
	127	struct bcm_device *dev = list_entry(p, struct bcm_device, list);
	128
	129	if (device == dev)
	130	return true;
	131	}
	132
	133	return false;
	134	}
	135
	136	static int bcm_gpio_set_power(struct bcm_device *dev, bool powered)
	137	{
	138	if (powered && !IS_ERR(dev->clk) && !dev->clk_enabled)
	139	clk_enable(dev->clk);
	140
2af0a709 LP	141	gpiod_set_value(dev->shutdown, powered);
2af0a709 LP	142	gpiod_set_value(dev->device_wakeup, powered);
0395ffc1 FD	143
	144	if (!powered && !IS_ERR(dev->clk) && dev->clk_enabled)
	145	clk_disable(dev->clk);
	146
	147	dev->clk_enabled = powered;
	148
	149	return 0;
	150	}
	151
bdd8818e MH	152	static int bcm_open(struct hci_uart *hu)
	153	{
	154	struct bcm_data *bcm;
0395ffc1	155	struct list_head *p;
bdd8818e MH	156
	157	BT_DBG("hu %p", hu);
	158
	159	bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
	160	if (!bcm)
	161	return -ENOMEM;
	162
	163	skb_queue_head_init(&bcm->txq);
	164
	165	hu->priv = bcm;
0395ffc1	166
917522aa	167	spin_lock(&bcm_device_lock);
0395ffc1 FD	168	list_for_each(p, &bcm_device_list) {
	169	struct bcm_device *dev = list_entry(p, struct bcm_device, list);
	170
	171	/* Retrieve saved bcm_device based on parent of the
	172	* platform device (saved during device probe) and
	173	* parent of tty device used by hci_uart
	174	*/
	175	if (hu->tty->dev->parent == dev->pdev->dev.parent) {
	176	bcm->dev = dev;
ae056908	177	hu->init_speed = dev->init_speed;
118612fb FD	178	#ifdef CONFIG_PM_SLEEP
	179	dev->hu = hu;
	180	#endif
0395ffc1 FD	181	break;
	182	}
	183	}
	184
	185	if (bcm->dev)
	186	bcm_gpio_set_power(bcm->dev, true);
	187
917522aa	188	spin_unlock(&bcm_device_lock);
0395ffc1	189
bdd8818e MH	190	return 0;
	191	}
	192
	193	static int bcm_close(struct hci_uart *hu)
	194	{
	195	struct bcm_data *bcm = hu->priv;
	196
	197	BT_DBG("hu %p", hu);
	198
0395ffc1	199	/* Protect bcm->dev against removal of the device or driver */
917522aa	200	spin_lock(&bcm_device_lock);
118612fb	201	if (bcm_device_exists(bcm->dev)) {
0395ffc1	202	bcm_gpio_set_power(bcm->dev, false);
118612fb FD	203	#ifdef CONFIG_PM_SLEEP
	204	bcm->dev->hu = NULL;
	205	#endif
	206	}
917522aa	207	spin_unlock(&bcm_device_lock);
0395ffc1	208
bdd8818e MH	209	skb_queue_purge(&bcm->txq);
	210	kfree_skb(bcm->rx_skb);
	211	kfree(bcm);
	212
	213	hu->priv = NULL;
	214	return 0;
	215	}
	216
	217	static int bcm_flush(struct hci_uart *hu)
	218	{
	219	struct bcm_data *bcm = hu->priv;
	220
	221	BT_DBG("hu %p", hu);
	222
	223	skb_queue_purge(&bcm->txq);
	224
	225	return 0;
	226	}
	227
	228	static int bcm_setup(struct hci_uart *hu)
	229	{
6be09b48 FD	230	char fw_name[64];
6be09b48 FD	231	const struct firmware *fw;
960ef1d7	232	unsigned int speed;
6be09b48 FD	233	int err;
6be09b48 FD	234
bdd8818e MH	235	BT_DBG("hu %p", hu);
	236
	237	hu->hdev->set_bdaddr = btbcm_set_bdaddr;
	238
6be09b48 FD	239	err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name));
	240	if (err)
	241	return err;
	242
	243	err = request_firmware(&fw, fw_name, &hu->hdev->dev);
	244	if (err < 0) {
	245	BT_INFO("%s: BCM: Patch %s not found", hu->hdev->name, fw_name);
	246	return 0;
	247	}
	248
	249	err = btbcm_patchram(hu->hdev, fw);
	250	if (err) {
	251	BT_INFO("%s: BCM: Patch failed (%d)", hu->hdev->name, err);
	252	goto finalize;
	253	}
	254
960ef1d7 FD	255	/* Init speed if any */
	256	if (hu->init_speed)
	257	speed = hu->init_speed;
	258	else if (hu->proto->init_speed)
	259	speed = hu->proto->init_speed;
	260	else
	261	speed = 0;
	262
	263	if (speed)
	264	hci_uart_set_baudrate(hu, speed);
	265
	266	/* Operational speed if any */
	267	if (hu->oper_speed)
	268	speed = hu->oper_speed;
	269	else if (hu->proto->oper_speed)
	270	speed = hu->proto->oper_speed;
	271	else
	272	speed = 0;
	273
	274	if (speed) {
	275	err = bcm_set_baudrate(hu, speed);
61b2fc2b	276	if (!err)
960ef1d7	277	hci_uart_set_baudrate(hu, speed);
61b2fc2b FD	278	}
61b2fc2b FD	279
6be09b48 FD	280	finalize:
	281	release_firmware(fw);
	282
	283	err = btbcm_finalize(hu->hdev);
	284
	285	return err;
bdd8818e MH	286	}
bdd8818e MH	287
79b8df93 MH	288	static const struct h4_recv_pkt bcm_recv_pkts[] = {
	289	{ H4_RECV_ACL, .recv = hci_recv_frame },
	290	{ H4_RECV_SCO, .recv = hci_recv_frame },
	291	{ H4_RECV_EVENT, .recv = hci_recv_frame },
	292	};
	293
bdd8818e MH	294	static int bcm_recv(struct hci_uart hu, const void data, int count)
	295	{
	296	struct bcm_data *bcm = hu->priv;
	297
	298	if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
	299	return -EUNATCH;
	300
79b8df93 MH	301	bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
79b8df93 MH	302	bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
bdd8818e MH	303	if (IS_ERR(bcm->rx_skb)) {
	304	int err = PTR_ERR(bcm->rx_skb);
	305	BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err);
37134167	306	bcm->rx_skb = NULL;
bdd8818e MH	307	return err;
	308	}
	309
	310	return count;
	311	}
	312
	313	static int bcm_enqueue(struct hci_uart hu, struct sk_buff skb)
	314	{
	315	struct bcm_data *bcm = hu->priv;
	316
	317	BT_DBG("hu %p skb %p", hu, skb);
	318
	319	/* Prepend skb with frame type */
	320	memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
	321	skb_queue_tail(&bcm->txq, skb);
	322
	323	return 0;
	324	}
	325
	326	static struct sk_buff bcm_dequeue(struct hci_uart hu)
	327	{
	328	struct bcm_data *bcm = hu->priv;
	329
	330	return skb_dequeue(&bcm->txq);
	331	}
	332
118612fb FD	333	#ifdef CONFIG_PM_SLEEP
	334	/* Platform suspend callback */
	335	static int bcm_suspend(struct device *dev)
	336	{
	337	struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
	338
	339	BT_DBG("suspend (%p): is_suspended %d", bdev, bdev->is_suspended);
	340
917522aa FD	341	spin_lock(&bcm_device_lock);
	342
	343	if (!bdev->hu)
	344	goto unlock;
	345
118612fb FD	346	if (!bdev->is_suspended) {
	347	hci_uart_set_flow_control(bdev->hu, true);
	348
	349	/* Once this callback returns, driver suspends BT via GPIO */
	350	bdev->is_suspended = true;
	351	}
	352
	353	/* Suspend the device */
	354	if (bdev->device_wakeup) {
	355	gpiod_set_value(bdev->device_wakeup, false);
	356	BT_DBG("suspend, delaying 15 ms");
	357	mdelay(15);
	358	}
	359
917522aa FD	360	unlock:
	361	spin_unlock(&bcm_device_lock);
	362
118612fb FD	363	return 0;
	364	}
	365
	366	/* Platform resume callback */
	367	static int bcm_resume(struct device *dev)
	368	{
	369	struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
	370
	371	BT_DBG("resume (%p): is_suspended %d", bdev, bdev->is_suspended);
	372
917522aa FD	373	spin_lock(&bcm_device_lock);
	374
	375	if (!bdev->hu)
	376	goto unlock;
	377
118612fb FD	378	if (bdev->device_wakeup) {
	379	gpiod_set_value(bdev->device_wakeup, true);
	380	BT_DBG("resume, delaying 15 ms");
	381	mdelay(15);
	382	}
	383
	384	/* When this callback executes, the device has woken up already */
	385	if (bdev->is_suspended) {
	386	bdev->is_suspended = false;
	387
	388	hci_uart_set_flow_control(bdev->hu, false);
	389	}
	390
917522aa FD	391	unlock:
	392	spin_unlock(&bcm_device_lock);
	393
118612fb FD	394	return 0;
	395	}
	396	#endif
	397
0395ffc1 FD	398	static const struct acpi_gpio_params device_wakeup_gpios = { 0, 0, false };
	399	static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false };
	400
	401	static const struct acpi_gpio_mapping acpi_bcm_default_gpios[] = {
	402	{ "device-wakeup-gpios", &device_wakeup_gpios, 1 },
	403	{ "shutdown-gpios", &shutdown_gpios, 1 },
	404	{ },
	405	};
	406
50d78bcf	407	#ifdef CONFIG_ACPI
ae056908 FD	408	static int bcm_resource(struct acpi_resource ares, void data)
	409	{
	410	struct bcm_device *dev = data;
	411
	412	if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {
	413	struct acpi_resource_uart_serialbus *sb;
	414
	415	sb = &ares->data.uart_serial_bus;
	416	if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART)
	417	dev->init_speed = sb->default_baud_rate;
	418	}
	419
	420	/* Always tell the ACPI core to skip this resource */
	421	return 1;
	422	}
	423
0395ffc1 FD	424	static int bcm_acpi_probe(struct bcm_device *dev)
	425	{
	426	struct platform_device *pdev = dev->pdev;
	427	const struct acpi_device_id *id;
ae056908 FD	428	struct acpi_device *adev;
ae056908 FD	429	LIST_HEAD(resources);
0395ffc1 FD	430	int ret;
	431
	432	id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
	433	if (!id)
	434	return -ENODEV;
	435
	436	/* Retrieve GPIO data */
	437	dev->name = dev_name(&pdev->dev);
	438	ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(&pdev->dev),
	439	acpi_bcm_default_gpios);
	440	if (ret)
	441	return ret;
	442
	443	dev->clk = devm_clk_get(&pdev->dev, NULL);
	444
62aaefa7 UKK	445	dev->device_wakeup = devm_gpiod_get_optional(&pdev->dev,
	446	"device-wakeup",
	447	GPIOD_OUT_LOW);
	448	if (IS_ERR(dev->device_wakeup))
	449	return PTR_ERR(dev->device_wakeup);
0395ffc1	450
62aaefa7 UKK	451	dev->shutdown = devm_gpiod_get_optional(&pdev->dev, "shutdown",
	452	GPIOD_OUT_LOW);
	453	if (IS_ERR(dev->shutdown))
	454	return PTR_ERR(dev->shutdown);
0395ffc1 FD	455
	456	/* Make sure at-least one of the GPIO is defined and that
	457	* a name is specified for this instance
	458	*/
	459	if ((!dev->device_wakeup && !dev->shutdown) \|\| !dev->name) {
	460	dev_err(&pdev->dev, "invalid platform data\n");
	461	return -EINVAL;
	462	}
	463
ae056908 FD	464	/* Retrieve UART ACPI info */
	465	adev = ACPI_COMPANION(&dev->pdev->dev);
	466	if (!adev)
	467	return 0;
	468
	469	acpi_dev_get_resources(adev, &resources, bcm_resource, dev);
	470
0395ffc1 FD	471	return 0;
0395ffc1 FD	472	}
50d78bcf FD	473	#else
	474	static int bcm_acpi_probe(struct bcm_device *dev)
	475	{
	476	return -EINVAL;
	477	}
	478	#endif /* CONFIG_ACPI */
0395ffc1 FD	479
	480	static int bcm_probe(struct platform_device *pdev)
	481	{
	482	struct bcm_device *dev;
	483	struct acpi_device_id *pdata = pdev->dev.platform_data;
	484	int ret;
	485
	486	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
	487	if (!dev)
	488	return -ENOMEM;
	489
	490	dev->pdev = pdev;
	491
	492	if (ACPI_HANDLE(&pdev->dev)) {
	493	ret = bcm_acpi_probe(dev);
	494	if (ret)
	495	return ret;
	496	} else if (pdata) {
	497	dev->name = pdata->id;
	498	} else {
	499	return -ENODEV;
	500	}
	501
	502	platform_set_drvdata(pdev, dev);
	503
	504	dev_info(&pdev->dev, "%s device registered.\n", dev->name);
	505
	506	/* Place this instance on the device list */
917522aa	507	spin_lock(&bcm_device_lock);
0395ffc1	508	list_add_tail(&dev->list, &bcm_device_list);
917522aa	509	spin_unlock(&bcm_device_lock);
0395ffc1 FD	510
	511	bcm_gpio_set_power(dev, false);
	512
	513	return 0;
	514	}
	515
	516	static int bcm_remove(struct platform_device *pdev)
	517	{
	518	struct bcm_device *dev = platform_get_drvdata(pdev);
	519
917522aa	520	spin_lock(&bcm_device_lock);
0395ffc1	521	list_del(&dev->list);
917522aa	522	spin_unlock(&bcm_device_lock);
0395ffc1 FD	523
	524	acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->dev));
	525
	526	dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);
	527
	528	return 0;
	529	}
	530
bdd8818e MH	531	static const struct hci_uart_proto bcm_proto = {
	532	.id = HCI_UART_BCM,
	533	.name = "BCM",
61b2fc2b FD	534	.init_speed = 115200,
61b2fc2b FD	535	.oper_speed = 4000000,
bdd8818e MH	536	.open = bcm_open,
	537	.close = bcm_close,
	538	.flush = bcm_flush,
	539	.setup = bcm_setup,
61b2fc2b	540	.set_baudrate = bcm_set_baudrate,
bdd8818e MH	541	.recv = bcm_recv,
	542	.enqueue = bcm_enqueue,
	543	.dequeue = bcm_dequeue,
	544	};
	545
0395ffc1 FD	546	#ifdef CONFIG_ACPI
	547	static const struct acpi_device_id bcm_acpi_match[] = {
	548	{ "BCM2E39", 0 },
	549	{ "BCM2E67", 0 },
	550	{ },
	551	};
	552	MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
	553	#endif
	554
118612fb FD	555	/* Platform suspend and resume callbacks */
	556	static SIMPLE_DEV_PM_OPS(bcm_pm_ops, bcm_suspend, bcm_resume);
	557
0395ffc1 FD	558	static struct platform_driver bcm_driver = {
	559	.probe = bcm_probe,
	560	.remove = bcm_remove,
	561	.driver = {
	562	.name = "hci_bcm",
	563	.acpi_match_table = ACPI_PTR(bcm_acpi_match),
118612fb	564	.pm = &bcm_pm_ops,
0395ffc1 FD	565	},
	566	};
	567
bdd8818e MH	568	int __init bcm_init(void)
bdd8818e MH	569	{
0395ffc1 FD	570	platform_driver_register(&bcm_driver);
0395ffc1 FD	571
bdd8818e MH	572	return hci_uart_register_proto(&bcm_proto);
	573	}
	574
	575	int __exit bcm_deinit(void)
	576	{
0395ffc1 FD	577	platform_driver_unregister(&bcm_driver);
0395ffc1 FD	578
bdd8818e MH	579	return hci_uart_unregister_proto(&bcm_proto);
bdd8818e MH	580	}