[linux-2.6-block.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 <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>

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

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

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;
}

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

	BT_DBG("hu %p", hu);

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

	skb_queue_head_init(&bcm->txq);

	hu->priv = bcm;
	return 0;
}

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

	BT_DBG("hu %p", hu);

	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 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,
};

int __init bcm_init(void)
{
	return hci_uart_register_proto(&bcm_proto);
}

int __exit bcm_deinit(void)
{
	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>
e9a2dd26 MH	28
	29	#include <net/bluetooth/bluetooth.h>
	30	#include <net/bluetooth/hci_core.h>
	31
bdd8818e	32	#include "btbcm.h"
e9a2dd26	33	#include "hci_uart.h"
bdd8818e MH	34
	35	struct bcm_data {
	36	struct sk_buff *rx_skb;
	37	struct sk_buff_head txq;
	38	};
	39
61b2fc2b FD	40	static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed)
	41	{
	42	struct hci_dev *hdev = hu->hdev;
	43	struct sk_buff *skb;
	44	struct bcm_update_uart_baud_rate param;
	45
	46	if (speed > 3000000) {
	47	struct bcm_write_uart_clock_setting clock;
	48
	49	clock.type = BCM_UART_CLOCK_48MHZ;
	50
	51	BT_DBG("%s: Set Controller clock (%d)", hdev->name, clock.type);
	52
	53	/* This Broadcom specific command changes the UART's controller
	54	* clock for baud rate > 3000000.
	55	*/
	56	skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT);
	57	if (IS_ERR(skb)) {
	58	int err = PTR_ERR(skb);
	59	BT_ERR("%s: BCM: failed to write clock command (%d)",
	60	hdev->name, err);
	61	return err;
	62	}
	63
	64	kfree_skb(skb);
	65	}
	66
	67	BT_DBG("%s: Set Controller UART speed to %d bit/s", hdev->name, speed);
	68
	69	param.zero = cpu_to_le16(0);
	70	param.baud_rate = cpu_to_le32(speed);
	71
	72	/* This Broadcom specific command changes the UART's controller baud
	73	* rate.
	74	*/
	75	skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), &param,
	76	HCI_INIT_TIMEOUT);
	77	if (IS_ERR(skb)) {
	78	int err = PTR_ERR(skb);
	79	BT_ERR("%s: BCM: failed to write update baudrate command (%d)",
	80	hdev->name, err);
	81	return err;
	82	}
	83
	84	kfree_skb(skb);
	85
	86	return 0;
	87	}
	88
bdd8818e MH	89	static int bcm_open(struct hci_uart *hu)
	90	{
	91	struct bcm_data *bcm;
	92
	93	BT_DBG("hu %p", hu);
	94
	95	bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
	96	if (!bcm)
	97	return -ENOMEM;
	98
	99	skb_queue_head_init(&bcm->txq);
	100
	101	hu->priv = bcm;
	102	return 0;
	103	}
	104
	105	static int bcm_close(struct hci_uart *hu)
	106	{
	107	struct bcm_data *bcm = hu->priv;
	108
	109	BT_DBG("hu %p", hu);
	110
	111	skb_queue_purge(&bcm->txq);
	112	kfree_skb(bcm->rx_skb);
	113	kfree(bcm);
	114
	115	hu->priv = NULL;
	116	return 0;
	117	}
	118
	119	static int bcm_flush(struct hci_uart *hu)
	120	{
	121	struct bcm_data *bcm = hu->priv;
	122
	123	BT_DBG("hu %p", hu);
	124
	125	skb_queue_purge(&bcm->txq);
	126
	127	return 0;
	128	}
	129
	130	static int bcm_setup(struct hci_uart *hu)
	131	{
6be09b48 FD	132	char fw_name[64];
6be09b48 FD	133	const struct firmware *fw;
960ef1d7	134	unsigned int speed;
6be09b48 FD	135	int err;
6be09b48 FD	136
bdd8818e MH	137	BT_DBG("hu %p", hu);
	138
	139	hu->hdev->set_bdaddr = btbcm_set_bdaddr;
	140
6be09b48 FD	141	err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name));
	142	if (err)
	143	return err;
	144
	145	err = request_firmware(&fw, fw_name, &hu->hdev->dev);
	146	if (err < 0) {
	147	BT_INFO("%s: BCM: Patch %s not found", hu->hdev->name, fw_name);
	148	return 0;
	149	}
	150
	151	err = btbcm_patchram(hu->hdev, fw);
	152	if (err) {
	153	BT_INFO("%s: BCM: Patch failed (%d)", hu->hdev->name, err);
	154	goto finalize;
	155	}
	156
960ef1d7 FD	157	/* Init speed if any */
	158	if (hu->init_speed)
	159	speed = hu->init_speed;
	160	else if (hu->proto->init_speed)
	161	speed = hu->proto->init_speed;
	162	else
	163	speed = 0;
	164
	165	if (speed)
	166	hci_uart_set_baudrate(hu, speed);
	167
	168	/* Operational speed if any */
	169	if (hu->oper_speed)
	170	speed = hu->oper_speed;
	171	else if (hu->proto->oper_speed)
	172	speed = hu->proto->oper_speed;
	173	else
	174	speed = 0;
	175
	176	if (speed) {
	177	err = bcm_set_baudrate(hu, speed);
61b2fc2b	178	if (!err)
960ef1d7	179	hci_uart_set_baudrate(hu, speed);
61b2fc2b FD	180	}
61b2fc2b FD	181
6be09b48 FD	182	finalize:
	183	release_firmware(fw);
	184
	185	err = btbcm_finalize(hu->hdev);
	186
	187	return err;
bdd8818e MH	188	}
bdd8818e MH	189
79b8df93 MH	190	static const struct h4_recv_pkt bcm_recv_pkts[] = {
	191	{ H4_RECV_ACL, .recv = hci_recv_frame },
	192	{ H4_RECV_SCO, .recv = hci_recv_frame },
	193	{ H4_RECV_EVENT, .recv = hci_recv_frame },
	194	};
	195
bdd8818e MH	196	static int bcm_recv(struct hci_uart hu, const void data, int count)
	197	{
	198	struct bcm_data *bcm = hu->priv;
	199
	200	if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
	201	return -EUNATCH;
	202
79b8df93 MH	203	bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
79b8df93 MH	204	bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
bdd8818e MH	205	if (IS_ERR(bcm->rx_skb)) {
	206	int err = PTR_ERR(bcm->rx_skb);
	207	BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err);
37134167	208	bcm->rx_skb = NULL;
bdd8818e MH	209	return err;
	210	}
	211
	212	return count;
	213	}
	214
	215	static int bcm_enqueue(struct hci_uart hu, struct sk_buff skb)
	216	{
	217	struct bcm_data *bcm = hu->priv;
	218
	219	BT_DBG("hu %p skb %p", hu, skb);
	220
	221	/* Prepend skb with frame type */
	222	memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
	223	skb_queue_tail(&bcm->txq, skb);
	224
	225	return 0;
	226	}
	227
	228	static struct sk_buff bcm_dequeue(struct hci_uart hu)
	229	{
	230	struct bcm_data *bcm = hu->priv;
	231
	232	return skb_dequeue(&bcm->txq);
	233	}
	234
	235	static const struct hci_uart_proto bcm_proto = {
	236	.id = HCI_UART_BCM,
	237	.name = "BCM",
61b2fc2b FD	238	.init_speed = 115200,
61b2fc2b FD	239	.oper_speed = 4000000,
bdd8818e MH	240	.open = bcm_open,
	241	.close = bcm_close,
	242	.flush = bcm_flush,
	243	.setup = bcm_setup,
61b2fc2b	244	.set_baudrate = bcm_set_baudrate,
bdd8818e MH	245	.recv = bcm_recv,
	246	.enqueue = bcm_enqueue,
	247	.dequeue = bcm_dequeue,
	248	};
	249
	250	int __init bcm_init(void)
	251	{
	252	return hci_uart_register_proto(&bcm_proto);
	253	}
	254
	255	int __exit bcm_deinit(void)
	256	{
	257	return hci_uart_unregister_proto(&bcm_proto);
	258	}