[Bluetooth] Add UART driver for Texas Instruments' BRF63xx chips (166d2f6a) · Commits · e / devices / android_kernel_teracube_2e

drivers/bluetooth/Kconfig

+11 −0

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

		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
		tristate "HCI BCM203x USB driver"
		depends on USB

drivers/bluetooth/Makefile

+1 −0

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

drivers/bluetooth/hci_ldisc.c

+7 −1

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

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

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

drivers/bluetooth/hci_ll.c

0 → 100644

+531 −0

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

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

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

		struct hci_uart;

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

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