[Bluetooth] Add UART driver for Texas Instruments' BRF63xx chips (166d2f6a) · Commits · 方亚芬 / linux

drivers/bluetooth/Kconfig

+11 −0

Original line number	Original line	Diff line number	Diff line
	@@ -55,6 +55,17 @@ config BT_HCIUART_BCSP

	Say Y here to compile support for HCI BCSP protocol.		Say Y here to compile support for HCI BCSP protocol.

			config BT_HCIUART_LL
			bool "HCILL protocol support"
			depends on BT_HCIUART
			help
			HCILL (HCI Low Level) is a serial protocol for communication
			between Bluetooth device and host. This protocol is required for
			serial Bluetooth devices that are based on Texas Instruments'
			BRF chips.

			Say Y here to compile support for HCILL protocol.

	config BT_HCIBCM203X		config BT_HCIBCM203X
	tristate "HCI BCM203x USB driver"		tristate "HCI BCM203x USB driver"
	depends on USB		depends on USB

drivers/bluetooth/Makefile

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -16,4 +16,5 @@ obj-$(CONFIG_BT_HCIBTUART) += btuart_cs.o
	hci_uart-y := hci_ldisc.o		hci_uart-y := hci_ldisc.o
	hci_uart-$(CONFIG_BT_HCIUART_H4) += hci_h4.o		hci_uart-$(CONFIG_BT_HCIUART_H4) += hci_h4.o
	hci_uart-$(CONFIG_BT_HCIUART_BCSP) += hci_bcsp.o		hci_uart-$(CONFIG_BT_HCIUART_BCSP) += hci_bcsp.o
			hci_uart-$(CONFIG_BT_HCIUART_LL) += hci_ll.o
	hci_uart-objs := $(hci_uart-y)		hci_uart-objs := $(hci_uart-y)

drivers/bluetooth/hci_ldisc.c

+7 −1

Original line number	Original line	Diff line number	Diff line
	@@ -549,6 +549,9 @@ static int __init hci_uart_init(void)
	#ifdef CONFIG_BT_HCIUART_BCSP		#ifdef CONFIG_BT_HCIUART_BCSP
	bcsp_init();		bcsp_init();
	#endif		#endif
			#ifdef CONFIG_BT_HCIUART_LL
			ll_init();
			#endif

	return 0;		return 0;
	}		}
	@@ -563,6 +566,9 @@ static void __exit hci_uart_exit(void)
	#ifdef CONFIG_BT_HCIUART_BCSP		#ifdef CONFIG_BT_HCIUART_BCSP
	bcsp_deinit();		bcsp_deinit();
	#endif		#endif
			#ifdef CONFIG_BT_HCIUART_LL
			ll_deinit();
			#endif

	/* Release tty registration of line discipline */		/* Release tty registration of line discipline */
	if ((err = tty_unregister_ldisc(N_HCI)))		if ((err = tty_unregister_ldisc(N_HCI)))

drivers/bluetooth/hci_ll.c

0 → 100644

+531 −0

Original line number	Original line	Diff line number	Diff line
			/*
			* Texas Instruments' Bluetooth HCILL UART protocol
			*
			* HCILL (HCI Low Level) is a Texas Instruments' power management
			* protocol extension to H4.
			*
			* Copyright (C) 2007 Texas Instruments, Inc.
			*
			* Written by Ohad Ben-Cohen <ohad@bencohen.org>
			*
			* Acknowledgements:
			* This file is based on hci_h4.c, which was written
			* by Maxim Krasnyansky and Marcel Holtmann.
			*
			* This program is free software; you can redistribute it and/or modify
			* it under the terms of the GNU General Public License version 2
			* as published by the Free Software Foundation
			*
			* 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/module.h>
			#include <linux/kernel.h>

			#include <linux/init.h>
			#include <linux/sched.h>
			#include <linux/types.h>
			#include <linux/fcntl.h>
			#include <linux/interrupt.h>
			#include <linux/ptrace.h>
			#include <linux/poll.h>

			#include <linux/slab.h>
			#include <linux/tty.h>
			#include <linux/errno.h>
			#include <linux/string.h>
			#include <linux/signal.h>
			#include <linux/ioctl.h>
			#include <linux/skbuff.h>

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

			#include "hci_uart.h"

			/* HCILL commands */
			#define HCILL_GO_TO_SLEEP_IND 0x30
			#define HCILL_GO_TO_SLEEP_ACK 0x31
			#define HCILL_WAKE_UP_IND 0x32
			#define HCILL_WAKE_UP_ACK 0x33

			/* HCILL receiver States */
			#define HCILL_W4_PACKET_TYPE 0
			#define HCILL_W4_EVENT_HDR 1
			#define HCILL_W4_ACL_HDR 2
			#define HCILL_W4_SCO_HDR 3
			#define HCILL_W4_DATA 4

			/* HCILL states */
			enum hcill_states_e {
			HCILL_ASLEEP,
			HCILL_ASLEEP_TO_AWAKE,
			HCILL_AWAKE,
			HCILL_AWAKE_TO_ASLEEP
			};

			struct hcill_cmd {
			u8 cmd;
			} __attribute__((packed));

			struct ll_struct {
			unsigned long rx_state;
			unsigned long rx_count;
			struct sk_buff *rx_skb;
			struct sk_buff_head txq;
			spinlock_t hcill_lock; /* HCILL state lock */
			unsigned long hcill_state; /* HCILL power state */
			struct sk_buff_head tx_wait_q; /* HCILL wait queue */
			};

			/*
			* Builds and sends an HCILL command packet.
			* These are very simple packets with only 1 cmd byte
			*/
			static int send_hcill_cmd(u8 cmd, struct hci_uart *hu)
			{
			int err = 0;
			struct sk_buff *skb = NULL;
			struct ll_struct *ll = hu->priv;
			struct hcill_cmd *hcill_packet;

			BT_DBG("hu %p cmd 0x%x", hu, cmd);

			/* allocate packet */
			skb = bt_skb_alloc(1, GFP_ATOMIC);
			if (!skb) {
			BT_ERR("cannot allocate memory for HCILL packet");
			err = -ENOMEM;
			goto out;
			}

			/* prepare packet */
			hcill_packet = (struct hcill_cmd *) skb_put(skb, 1);
			hcill_packet->cmd = cmd;
			skb->dev = (void *) hu->hdev;

			/* send packet */
			skb_queue_tail(&ll->txq, skb);
			out:
			return err;
			}

			/* Initialize protocol */
			static int ll_open(struct hci_uart *hu)
			{
			struct ll_struct *ll;

			BT_DBG("hu %p", hu);

			ll = kzalloc(sizeof(*ll), GFP_ATOMIC);
			if (!ll)
			return -ENOMEM;

			skb_queue_head_init(&ll->txq);
			skb_queue_head_init(&ll->tx_wait_q);
			spin_lock_init(&ll->hcill_lock);

			ll->hcill_state = HCILL_AWAKE;

			hu->priv = ll;

			return 0;
			}

			/* Flush protocol data */
			static int ll_flush(struct hci_uart *hu)
			{
			struct ll_struct *ll = hu->priv;

			BT_DBG("hu %p", hu);

			skb_queue_purge(&ll->tx_wait_q);
			skb_queue_purge(&ll->txq);

			return 0;
			}

			/* Close protocol */
			static int ll_close(struct hci_uart *hu)
			{
			struct ll_struct *ll = hu->priv;

			BT_DBG("hu %p", hu);

			skb_queue_purge(&ll->tx_wait_q);
			skb_queue_purge(&ll->txq);

			if (ll->rx_skb)
			kfree_skb(ll->rx_skb);

			hu->priv = NULL;

			kfree(ll);

			return 0;
			}

			/*
			* internal function, which does common work of the device wake up process:
			* 1. places all pending packets (waiting in tx_wait_q list) in txq list.
			* 2. changes internal state to HCILL_AWAKE.
			* Note: assumes that hcill_lock spinlock is taken,
			* shouldn't be called otherwise!
			*/
			static void __ll_do_awake(struct ll_struct *ll)
			{
			struct sk_buff *skb = NULL;

			while ((skb = skb_dequeue(&ll->tx_wait_q)))
			skb_queue_tail(&ll->txq, skb);

			ll->hcill_state = HCILL_AWAKE;
			}

			/*
			* Called upon a wake-up-indication from the device
			*/
			static void ll_device_want_to_wakeup(struct hci_uart *hu)
			{
			unsigned long flags;
			struct ll_struct *ll = hu->priv;

			BT_DBG("hu %p", hu);

			/* lock hcill state */
			spin_lock_irqsave(&ll->hcill_lock, flags);

			switch (ll->hcill_state) {
			case HCILL_ASLEEP:
			/* acknowledge device wake up */
			if (send_hcill_cmd(HCILL_WAKE_UP_ACK, hu) < 0) {
			BT_ERR("cannot acknowledge device wake up");
			goto out;
			}
			break;
			case HCILL_ASLEEP_TO_AWAKE:
			/*
			* this state means that a wake-up-indication
			* is already on its way to the device,
			* and will serve as the required wake-up-ack
			*/
			BT_DBG("dual wake-up-indication");
			break;
			default:
			/* any other state are illegal */
			BT_ERR("received HCILL_WAKE_UP_IND in state %ld", ll->hcill_state);
			break;
			}

			/* send pending packets and change state to HCILL_AWAKE */
			__ll_do_awake(ll);

			out:
			spin_unlock_irqrestore(&ll->hcill_lock, flags);

			/* actually send the packets */
			hci_uart_tx_wakeup(hu);
			}

			/*
			* Called upon a sleep-indication from the device
			*/
			static void ll_device_want_to_sleep(struct hci_uart *hu)
			{
			unsigned long flags;
			struct ll_struct *ll = hu->priv;

			BT_DBG("hu %p", hu);

			/* lock hcill state */
			spin_lock_irqsave(&ll->hcill_lock, flags);

			/* sanity check */
			if (ll->hcill_state != HCILL_AWAKE)
			BT_ERR("ERR: HCILL_GO_TO_SLEEP_IND in state %ld", ll->hcill_state);

			/* acknowledge device sleep */
			if (send_hcill_cmd(HCILL_GO_TO_SLEEP_ACK, hu) < 0) {
			BT_ERR("cannot acknowledge device sleep");
			goto out;
			}

			/* update state */
			ll->hcill_state = HCILL_ASLEEP;

			out:
			spin_unlock_irqrestore(&ll->hcill_lock, flags);

			/* actually send the sleep ack packet */
			hci_uart_tx_wakeup(hu);
			}

			/*
			* Called upon wake-up-acknowledgement from the device
			*/
			static void ll_device_woke_up(struct hci_uart *hu)
			{
			unsigned long flags;
			struct ll_struct *ll = hu->priv;

			BT_DBG("hu %p", hu);

			/* lock hcill state */
			spin_lock_irqsave(&ll->hcill_lock, flags);

			/* sanity check */
			if (ll->hcill_state != HCILL_ASLEEP_TO_AWAKE)
			BT_ERR("received HCILL_WAKE_UP_ACK in state %ld", ll->hcill_state);

			/* send pending packets and change state to HCILL_AWAKE */
			__ll_do_awake(ll);

			spin_unlock_irqrestore(&ll->hcill_lock, flags);

			/* actually send the packets */
			hci_uart_tx_wakeup(hu);
			}

			/* Enqueue frame for transmittion (padding, crc, etc) */
			/* may be called from two simultaneous tasklets */
			static int ll_enqueue(struct hci_uart hu, struct sk_buff skb)
			{
			unsigned long flags = 0;
			struct ll_struct *ll = 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);

			/* lock hcill state */
			spin_lock_irqsave(&ll->hcill_lock, flags);

			/* act according to current state */
			switch (ll->hcill_state) {
			case HCILL_AWAKE:
			BT_DBG("device awake, sending normally");
			skb_queue_tail(&ll->txq, skb);
			break;
			case HCILL_ASLEEP:
			BT_DBG("device asleep, waking up and queueing packet");
			/* save packet for later */
			skb_queue_tail(&ll->tx_wait_q, skb);
			/* awake device */
			if (send_hcill_cmd(HCILL_WAKE_UP_IND, hu) < 0) {
			BT_ERR("cannot wake up device");
			break;
			}
			ll->hcill_state = HCILL_ASLEEP_TO_AWAKE;
			break;
			case HCILL_ASLEEP_TO_AWAKE:
			BT_DBG("device waking up, queueing packet");
			/* transient state; just keep packet for later */
			skb_queue_tail(&ll->tx_wait_q, skb);
			break;
			default:
			BT_ERR("illegal hcill state: %ld (losing packet)", ll->hcill_state);
			kfree_skb(skb);
			break;
			}

			spin_unlock_irqrestore(&ll->hcill_lock, flags);

			return 0;
			}

			static inline int ll_check_data_len(struct ll_struct *ll, int len)
			{
			register int room = skb_tailroom(ll->rx_skb);

			BT_DBG("len %d room %d", len, room);

			if (!len) {
			hci_recv_frame(ll->rx_skb);
			} else if (len > room) {
			BT_ERR("Data length is too large");
			kfree_skb(ll->rx_skb);
			} else {
			ll->rx_state = HCILL_W4_DATA;
			ll->rx_count = len;
			return len;
			}

			ll->rx_state = HCILL_W4_PACKET_TYPE;
			ll->rx_skb = NULL;
			ll->rx_count = 0;

			return 0;
			}

			/* Recv data */
			static int ll_recv(struct hci_uart hu, void data, int count)
			{
			struct ll_struct *ll = hu->priv;
			register char *ptr;
			struct hci_event_hdr *eh;
			struct hci_acl_hdr *ah;
			struct hci_sco_hdr *sh;
			register int len, type, dlen;

			BT_DBG("hu %p count %d rx_state %ld rx_count %ld", hu, count, ll->rx_state, ll->rx_count);

			ptr = data;
			while (count) {
			if (ll->rx_count) {
			len = min_t(unsigned int, ll->rx_count, count);
			memcpy(skb_put(ll->rx_skb, len), ptr, len);
			ll->rx_count -= len; count -= len; ptr += len;

			if (ll->rx_count)
			continue;

			switch (ll->rx_state) {
			case HCILL_W4_DATA:
			BT_DBG("Complete data");
			hci_recv_frame(ll->rx_skb);

			ll->rx_state = HCILL_W4_PACKET_TYPE;
			ll->rx_skb = NULL;
			continue;

			case HCILL_W4_EVENT_HDR:
			eh = (struct hci_event_hdr *) ll->rx_skb->data;

			BT_DBG("Event header: evt 0x%2.2x plen %d", eh->evt, eh->plen);

			ll_check_data_len(ll, eh->plen);
			continue;

			case HCILL_W4_ACL_HDR:
			ah = (struct hci_acl_hdr *) ll->rx_skb->data;
			dlen = __le16_to_cpu(ah->dlen);

			BT_DBG("ACL header: dlen %d", dlen);

			ll_check_data_len(ll, dlen);
			continue;

			case HCILL_W4_SCO_HDR:
			sh = (struct hci_sco_hdr *) ll->rx_skb->data;

			BT_DBG("SCO header: dlen %d", sh->dlen);

			ll_check_data_len(ll, sh->dlen);
			continue;
			}
			}

			/* HCILL_W4_PACKET_TYPE */
			switch (*ptr) {
			case HCI_EVENT_PKT:
			BT_DBG("Event packet");
			ll->rx_state = HCILL_W4_EVENT_HDR;
			ll->rx_count = HCI_EVENT_HDR_SIZE;
			type = HCI_EVENT_PKT;
			break;

			case HCI_ACLDATA_PKT:
			BT_DBG("ACL packet");
			ll->rx_state = HCILL_W4_ACL_HDR;
			ll->rx_count = HCI_ACL_HDR_SIZE;
			type = HCI_ACLDATA_PKT;
			break;

			case HCI_SCODATA_PKT:
			BT_DBG("SCO packet");
			ll->rx_state = HCILL_W4_SCO_HDR;
			ll->rx_count = HCI_SCO_HDR_SIZE;
			type = HCI_SCODATA_PKT;
			break;

			/* HCILL signals */
			case HCILL_GO_TO_SLEEP_IND:
			BT_DBG("HCILL_GO_TO_SLEEP_IND packet");
			ll_device_want_to_sleep(hu);
			ptr++; count--;
			continue;

			case HCILL_GO_TO_SLEEP_ACK:
			/* shouldn't happen */
			BT_ERR("received HCILL_GO_TO_SLEEP_ACK (in state %ld)", ll->hcill_state);
			ptr++; count--;
			continue;

			case HCILL_WAKE_UP_IND:
			BT_DBG("HCILL_WAKE_UP_IND packet");
			ll_device_want_to_wakeup(hu);
			ptr++; count--;
			continue;

			case HCILL_WAKE_UP_ACK:
			BT_DBG("HCILL_WAKE_UP_ACK packet");
			ll_device_woke_up(hu);
			ptr++; count--;
			continue;

			default:
			BT_ERR("Unknown HCI packet type %2.2x", (__u8)*ptr);
			hu->hdev->stat.err_rx++;
			ptr++; count--;
			continue;
			};

			ptr++; count--;

			/* Allocate packet */
			ll->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
			if (!ll->rx_skb) {
			BT_ERR("Can't allocate mem for new packet");
			ll->rx_state = HCILL_W4_PACKET_TYPE;
			ll->rx_count = 0;
			return 0;
			}

			ll->rx_skb->dev = (void *) hu->hdev;
			bt_cb(ll->rx_skb)->pkt_type = type;
			}

			return count;
			}

			static struct sk_buff ll_dequeue(struct hci_uart hu)
			{
			struct ll_struct *ll = hu->priv;
			return skb_dequeue(&ll->txq);
			}

			static struct hci_uart_proto llp = {
			.id = HCI_UART_LL,
			.open = ll_open,
			.close = ll_close,
			.recv = ll_recv,
			.enqueue = ll_enqueue,
			.dequeue = ll_dequeue,
			.flush = ll_flush,
			};

			int ll_init(void)
			{
			int err = hci_uart_register_proto(&llp);

			if (!err)
			BT_INFO("HCILL protocol initialized");
			else
			BT_ERR("HCILL protocol registration failed");

			return err;
			}

			int ll_deinit(void)
			{
			return hci_uart_unregister_proto(&llp);
			}

drivers/bluetooth/hci_uart.h

+7 −1

Original line number	Original line	Diff line number	Diff line
	@@ -33,12 +33,13 @@
	#define HCIUARTGETDEVICE _IOR('U', 202, int)		#define HCIUARTGETDEVICE _IOR('U', 202, int)

	/* UART protocols */		/* UART protocols */
	#define HCI_UART_MAX_PROTO 4		#define HCI_UART_MAX_PROTO 5

	#define HCI_UART_H4 0		#define HCI_UART_H4 0
	#define HCI_UART_BCSP 1		#define HCI_UART_BCSP 1
	#define HCI_UART_3WIRE 2		#define HCI_UART_3WIRE 2
	#define HCI_UART_H4DS 3		#define HCI_UART_H4DS 3
			#define HCI_UART_LL 4

	struct hci_uart;		struct hci_uart;

	@@ -85,3 +86,8 @@ int h4_deinit(void);
	int bcsp_init(void);		int bcsp_init(void);
	int bcsp_deinit(void);		int bcsp_deinit(void);
	#endif		#endif

			#ifdef CONFIG_BT_HCIUART_LL
			int ll_init(void);
			int ll_deinit(void);
			#endif