[mirror_ubuntu-bionic-kernel.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;
};

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_list_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_list_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_cansleep(dev->shutdown, powered);
	gpiod_set_value_cansleep(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_list_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;
			break;
		}
	}

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

	spin_unlock(&bcm_device_list_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_list_lock);
	if (bcm_device_exists(bcm->dev))
		bcm_gpio_set_power(bcm->dev, false);
	spin_unlock(&bcm_device_list_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);
}

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 },
	{ },
};

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 gpio_desc *gpio;
	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);

	gpio = devm_gpiod_get(&pdev->dev, "device-wakeup");
	if (!IS_ERR(gpio)) {
		ret = gpiod_direction_output(gpio, 0);
		if (ret)
			return ret;
		dev->device_wakeup = gpio;
	}

	gpio = devm_gpiod_get(&pdev->dev, "shutdown");
	if (!IS_ERR(gpio)) {
		ret = gpiod_direction_output(gpio, 0);
		if (ret)
			return ret;
		dev->shutdown = gpio;
	}

	/* 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;
}

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_list_lock);
	list_add_tail(&dev->list, &bcm_device_list);
	spin_unlock(&bcm_device_list_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_list_lock);
	list_del(&dev->list);
	spin_unlock(&bcm_device_list_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

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

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;
0395ffc1 FD	54	};
0395ffc1 FD	55
bdd8818e	56	struct bcm_data {
0395ffc1 FD	57	struct sk_buff *rx_skb;
	58	struct sk_buff_head txq;
	59
	60	struct bcm_device *dev;
bdd8818e MH	61	};
bdd8818e MH	62
0395ffc1 FD	63	/* List of BCM BT UART devices */
	64	static DEFINE_SPINLOCK(bcm_device_list_lock);
	65	static LIST_HEAD(bcm_device_list);
	66
61b2fc2b FD	67	static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed)
	68	{
	69	struct hci_dev *hdev = hu->hdev;
	70	struct sk_buff *skb;
	71	struct bcm_update_uart_baud_rate param;
	72
	73	if (speed > 3000000) {
	74	struct bcm_write_uart_clock_setting clock;
	75
	76	clock.type = BCM_UART_CLOCK_48MHZ;
	77
	78	BT_DBG("%s: Set Controller clock (%d)", hdev->name, clock.type);
	79
	80	/* This Broadcom specific command changes the UART's controller
	81	* clock for baud rate > 3000000.
	82	*/
	83	skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT);
	84	if (IS_ERR(skb)) {
	85	int err = PTR_ERR(skb);
	86	BT_ERR("%s: BCM: failed to write clock command (%d)",
	87	hdev->name, err);
	88	return err;
	89	}
	90
	91	kfree_skb(skb);
	92	}
	93
	94	BT_DBG("%s: Set Controller UART speed to %d bit/s", hdev->name, speed);
	95
	96	param.zero = cpu_to_le16(0);
	97	param.baud_rate = cpu_to_le32(speed);
	98
	99	/* This Broadcom specific command changes the UART's controller baud
	100	* rate.
	101	*/
	102	skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), &param,
	103	HCI_INIT_TIMEOUT);
	104	if (IS_ERR(skb)) {
	105	int err = PTR_ERR(skb);
	106	BT_ERR("%s: BCM: failed to write update baudrate command (%d)",
	107	hdev->name, err);
	108	return err;
	109	}
	110
	111	kfree_skb(skb);
	112
	113	return 0;
	114	}
	115
0395ffc1 FD	116	/* bcm_device_exists should be protected by bcm_device_list_lock */
	117	static bool bcm_device_exists(struct bcm_device *device)
	118	{
	119	struct list_head *p;
	120
	121	list_for_each(p, &bcm_device_list) {
	122	struct bcm_device *dev = list_entry(p, struct bcm_device, list);
	123
	124	if (device == dev)
	125	return true;
	126	}
	127
	128	return false;
	129	}
	130
	131	static int bcm_gpio_set_power(struct bcm_device *dev, bool powered)
	132	{
	133	if (powered && !IS_ERR(dev->clk) && !dev->clk_enabled)
	134	clk_enable(dev->clk);
	135
	136	gpiod_set_value_cansleep(dev->shutdown, powered);
	137	gpiod_set_value_cansleep(dev->device_wakeup, powered);
	138
	139	if (!powered && !IS_ERR(dev->clk) && dev->clk_enabled)
	140	clk_disable(dev->clk);
	141
	142	dev->clk_enabled = powered;
	143
	144	return 0;
	145	}
	146
bdd8818e MH	147	static int bcm_open(struct hci_uart *hu)
	148	{
	149	struct bcm_data *bcm;
0395ffc1	150	struct list_head *p;
bdd8818e MH	151
	152	BT_DBG("hu %p", hu);
	153
	154	bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
	155	if (!bcm)
	156	return -ENOMEM;
	157
	158	skb_queue_head_init(&bcm->txq);
	159
	160	hu->priv = bcm;
0395ffc1 FD	161
	162	spin_lock(&bcm_device_list_lock);
	163	list_for_each(p, &bcm_device_list) {
	164	struct bcm_device *dev = list_entry(p, struct bcm_device, list);
	165
	166	/* Retrieve saved bcm_device based on parent of the
	167	* platform device (saved during device probe) and
	168	* parent of tty device used by hci_uart
	169	*/
	170	if (hu->tty->dev->parent == dev->pdev->dev.parent) {
	171	bcm->dev = dev;
ae056908	172	hu->init_speed = dev->init_speed;
0395ffc1 FD	173	break;
	174	}
	175	}
	176
	177	if (bcm->dev)
	178	bcm_gpio_set_power(bcm->dev, true);
	179
	180	spin_unlock(&bcm_device_list_lock);
	181
bdd8818e MH	182	return 0;
	183	}
	184
	185	static int bcm_close(struct hci_uart *hu)
	186	{
	187	struct bcm_data *bcm = hu->priv;
	188
	189	BT_DBG("hu %p", hu);
	190
0395ffc1 FD	191	/* Protect bcm->dev against removal of the device or driver */
	192	spin_lock(&bcm_device_list_lock);
	193	if (bcm_device_exists(bcm->dev))
	194	bcm_gpio_set_power(bcm->dev, false);
	195	spin_unlock(&bcm_device_list_lock);
	196
bdd8818e MH	197	skb_queue_purge(&bcm->txq);
	198	kfree_skb(bcm->rx_skb);
	199	kfree(bcm);
	200
	201	hu->priv = NULL;
	202	return 0;
	203	}
	204
	205	static int bcm_flush(struct hci_uart *hu)
	206	{
	207	struct bcm_data *bcm = hu->priv;
	208
	209	BT_DBG("hu %p", hu);
	210
	211	skb_queue_purge(&bcm->txq);
	212
	213	return 0;
	214	}
	215
	216	static int bcm_setup(struct hci_uart *hu)
	217	{
6be09b48 FD	218	char fw_name[64];
6be09b48 FD	219	const struct firmware *fw;
960ef1d7	220	unsigned int speed;
6be09b48 FD	221	int err;
6be09b48 FD	222
bdd8818e MH	223	BT_DBG("hu %p", hu);
	224
	225	hu->hdev->set_bdaddr = btbcm_set_bdaddr;
	226
6be09b48 FD	227	err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name));
	228	if (err)
	229	return err;
	230
	231	err = request_firmware(&fw, fw_name, &hu->hdev->dev);
	232	if (err < 0) {
	233	BT_INFO("%s: BCM: Patch %s not found", hu->hdev->name, fw_name);
	234	return 0;
	235	}
	236
	237	err = btbcm_patchram(hu->hdev, fw);
	238	if (err) {
	239	BT_INFO("%s: BCM: Patch failed (%d)", hu->hdev->name, err);
	240	goto finalize;
	241	}
	242
960ef1d7 FD	243	/* Init speed if any */
	244	if (hu->init_speed)
	245	speed = hu->init_speed;
	246	else if (hu->proto->init_speed)
	247	speed = hu->proto->init_speed;
	248	else
	249	speed = 0;
	250
	251	if (speed)
	252	hci_uart_set_baudrate(hu, speed);
	253
	254	/* Operational speed if any */
	255	if (hu->oper_speed)
	256	speed = hu->oper_speed;
	257	else if (hu->proto->oper_speed)
	258	speed = hu->proto->oper_speed;
	259	else
	260	speed = 0;
	261
	262	if (speed) {
	263	err = bcm_set_baudrate(hu, speed);
61b2fc2b	264	if (!err)
960ef1d7	265	hci_uart_set_baudrate(hu, speed);
61b2fc2b FD	266	}
61b2fc2b FD	267
6be09b48 FD	268	finalize:
	269	release_firmware(fw);
	270
	271	err = btbcm_finalize(hu->hdev);
	272
	273	return err;
bdd8818e MH	274	}
bdd8818e MH	275
79b8df93 MH	276	static const struct h4_recv_pkt bcm_recv_pkts[] = {
	277	{ H4_RECV_ACL, .recv = hci_recv_frame },
	278	{ H4_RECV_SCO, .recv = hci_recv_frame },
	279	{ H4_RECV_EVENT, .recv = hci_recv_frame },
	280	};
	281
bdd8818e MH	282	static int bcm_recv(struct hci_uart hu, const void data, int count)
	283	{
	284	struct bcm_data *bcm = hu->priv;
	285
	286	if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
	287	return -EUNATCH;
	288
79b8df93 MH	289	bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
79b8df93 MH	290	bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
bdd8818e MH	291	if (IS_ERR(bcm->rx_skb)) {
	292	int err = PTR_ERR(bcm->rx_skb);
	293	BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err);
37134167	294	bcm->rx_skb = NULL;
bdd8818e MH	295	return err;
	296	}
	297
	298	return count;
	299	}
	300
	301	static int bcm_enqueue(struct hci_uart hu, struct sk_buff skb)
	302	{
	303	struct bcm_data *bcm = hu->priv;
	304
	305	BT_DBG("hu %p skb %p", hu, skb);
	306
	307	/* Prepend skb with frame type */
	308	memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
	309	skb_queue_tail(&bcm->txq, skb);
	310
	311	return 0;
	312	}
	313
	314	static struct sk_buff bcm_dequeue(struct hci_uart hu)
	315	{
	316	struct bcm_data *bcm = hu->priv;
	317
	318	return skb_dequeue(&bcm->txq);
	319	}
	320
0395ffc1 FD	321	static const struct acpi_gpio_params device_wakeup_gpios = { 0, 0, false };
	322	static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false };
	323
	324	static const struct acpi_gpio_mapping acpi_bcm_default_gpios[] = {
	325	{ "device-wakeup-gpios", &device_wakeup_gpios, 1 },
	326	{ "shutdown-gpios", &shutdown_gpios, 1 },
	327	{ },
	328	};
	329
ae056908 FD	330	static int bcm_resource(struct acpi_resource ares, void data)
	331	{
	332	struct bcm_device *dev = data;
	333
	334	if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {
	335	struct acpi_resource_uart_serialbus *sb;
	336
	337	sb = &ares->data.uart_serial_bus;
	338	if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART)
	339	dev->init_speed = sb->default_baud_rate;
	340	}
	341
	342	/* Always tell the ACPI core to skip this resource */
	343	return 1;
	344	}
	345
0395ffc1 FD	346	static int bcm_acpi_probe(struct bcm_device *dev)
	347	{
	348	struct platform_device *pdev = dev->pdev;
	349	const struct acpi_device_id *id;
	350	struct gpio_desc *gpio;
ae056908 FD	351	struct acpi_device *adev;
ae056908 FD	352	LIST_HEAD(resources);
0395ffc1 FD	353	int ret;
	354
	355	id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
	356	if (!id)
	357	return -ENODEV;
	358
	359	/* Retrieve GPIO data */
	360	dev->name = dev_name(&pdev->dev);
	361	ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(&pdev->dev),
	362	acpi_bcm_default_gpios);
	363	if (ret)
	364	return ret;
	365
	366	dev->clk = devm_clk_get(&pdev->dev, NULL);
	367
	368	gpio = devm_gpiod_get(&pdev->dev, "device-wakeup");
	369	if (!IS_ERR(gpio)) {
	370	ret = gpiod_direction_output(gpio, 0);
	371	if (ret)
	372	return ret;
	373	dev->device_wakeup = gpio;
	374	}
	375
	376	gpio = devm_gpiod_get(&pdev->dev, "shutdown");
	377	if (!IS_ERR(gpio)) {
	378	ret = gpiod_direction_output(gpio, 0);
	379	if (ret)
	380	return ret;
	381	dev->shutdown = gpio;
	382	}
	383
	384	/* Make sure at-least one of the GPIO is defined and that
	385	* a name is specified for this instance
	386	*/
	387	if ((!dev->device_wakeup && !dev->shutdown) \|\| !dev->name) {
	388	dev_err(&pdev->dev, "invalid platform data\n");
	389	return -EINVAL;
	390	}
	391
ae056908 FD	392	/* Retrieve UART ACPI info */
	393	adev = ACPI_COMPANION(&dev->pdev->dev);
	394	if (!adev)
	395	return 0;
	396
	397	acpi_dev_get_resources(adev, &resources, bcm_resource, dev);
	398
0395ffc1 FD	399	return 0;
	400	}
	401
	402	static int bcm_probe(struct platform_device *pdev)
	403	{
	404	struct bcm_device *dev;
	405	struct acpi_device_id *pdata = pdev->dev.platform_data;
	406	int ret;
	407
	408	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
	409	if (!dev)
	410	return -ENOMEM;
	411
	412	dev->pdev = pdev;
	413
	414	if (ACPI_HANDLE(&pdev->dev)) {
	415	ret = bcm_acpi_probe(dev);
	416	if (ret)
	417	return ret;
	418	} else if (pdata) {
	419	dev->name = pdata->id;
	420	} else {
	421	return -ENODEV;
	422	}
	423
	424	platform_set_drvdata(pdev, dev);
	425
	426	dev_info(&pdev->dev, "%s device registered.\n", dev->name);
	427
	428	/* Place this instance on the device list */
	429	spin_lock(&bcm_device_list_lock);
	430	list_add_tail(&dev->list, &bcm_device_list);
	431	spin_unlock(&bcm_device_list_lock);
	432
	433	bcm_gpio_set_power(dev, false);
	434
	435	return 0;
	436	}
	437
	438	static int bcm_remove(struct platform_device *pdev)
	439	{
	440	struct bcm_device *dev = platform_get_drvdata(pdev);
	441
	442	spin_lock(&bcm_device_list_lock);
	443	list_del(&dev->list);
	444	spin_unlock(&bcm_device_list_lock);
	445
	446	acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->dev));
	447
	448	dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);
	449
	450	return 0;
	451	}
	452
bdd8818e MH	453	static const struct hci_uart_proto bcm_proto = {
	454	.id = HCI_UART_BCM,
	455	.name = "BCM",
61b2fc2b FD	456	.init_speed = 115200,
61b2fc2b FD	457	.oper_speed = 4000000,
bdd8818e MH	458	.open = bcm_open,
	459	.close = bcm_close,
	460	.flush = bcm_flush,
	461	.setup = bcm_setup,
61b2fc2b	462	.set_baudrate = bcm_set_baudrate,
bdd8818e MH	463	.recv = bcm_recv,
	464	.enqueue = bcm_enqueue,
	465	.dequeue = bcm_dequeue,
	466	};
	467
0395ffc1 FD	468	#ifdef CONFIG_ACPI
	469	static const struct acpi_device_id bcm_acpi_match[] = {
	470	{ "BCM2E39", 0 },
	471	{ "BCM2E67", 0 },
	472	{ },
	473	};
	474	MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
	475	#endif
	476
	477	static struct platform_driver bcm_driver = {
	478	.probe = bcm_probe,
	479	.remove = bcm_remove,
	480	.driver = {
	481	.name = "hci_bcm",
	482	.acpi_match_table = ACPI_PTR(bcm_acpi_match),
	483	},
	484	};
	485
bdd8818e MH	486	int __init bcm_init(void)
bdd8818e MH	487	{
0395ffc1 FD	488	platform_driver_register(&bcm_driver);
0395ffc1 FD	489
bdd8818e MH	490	return hci_uart_register_proto(&bcm_proto);
	491	}
	492
	493	int __exit bcm_deinit(void)
	494	{
0395ffc1 FD	495	platform_driver_unregister(&bcm_driver);
0395ffc1 FD	496
bdd8818e MH	497	return hci_uart_unregister_proto(&bcm_proto);
bdd8818e MH	498	}