mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 01:36:41 +07:00
fc5fef615a
Let the compiler chooses what is best. Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
536 lines
12 KiB
C
536 lines
12 KiB
C
/*
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* Texas Instruments' Bluetooth HCILL UART protocol
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*
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* HCILL (HCI Low Level) is a Texas Instruments' power management
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* protocol extension to H4.
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*
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* Copyright (C) 2007 Texas Instruments, Inc.
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*
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* Written by Ohad Ben-Cohen <ohad@bencohen.org>
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*
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* Acknowledgements:
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* This file is based on hci_h4.c, which was written
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* by Maxim Krasnyansky and Marcel Holtmann.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/types.h>
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#include <linux/fcntl.h>
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#include <linux/interrupt.h>
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#include <linux/ptrace.h>
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#include <linux/poll.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/signal.h>
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#include <linux/ioctl.h>
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#include <linux/skbuff.h>
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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#include "hci_uart.h"
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/* HCILL commands */
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#define HCILL_GO_TO_SLEEP_IND 0x30
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#define HCILL_GO_TO_SLEEP_ACK 0x31
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#define HCILL_WAKE_UP_IND 0x32
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#define HCILL_WAKE_UP_ACK 0x33
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/* HCILL receiver States */
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#define HCILL_W4_PACKET_TYPE 0
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#define HCILL_W4_EVENT_HDR 1
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#define HCILL_W4_ACL_HDR 2
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#define HCILL_W4_SCO_HDR 3
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#define HCILL_W4_DATA 4
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/* HCILL states */
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enum hcill_states_e {
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HCILL_ASLEEP,
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HCILL_ASLEEP_TO_AWAKE,
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HCILL_AWAKE,
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HCILL_AWAKE_TO_ASLEEP
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};
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struct hcill_cmd {
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u8 cmd;
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} __packed;
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struct ll_struct {
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unsigned long rx_state;
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unsigned long rx_count;
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struct sk_buff *rx_skb;
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struct sk_buff_head txq;
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spinlock_t hcill_lock; /* HCILL state lock */
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unsigned long hcill_state; /* HCILL power state */
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struct sk_buff_head tx_wait_q; /* HCILL wait queue */
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};
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/*
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* Builds and sends an HCILL command packet.
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* These are very simple packets with only 1 cmd byte
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*/
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static int send_hcill_cmd(u8 cmd, struct hci_uart *hu)
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{
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int err = 0;
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struct sk_buff *skb = NULL;
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struct ll_struct *ll = hu->priv;
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struct hcill_cmd *hcill_packet;
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BT_DBG("hu %p cmd 0x%x", hu, cmd);
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/* allocate packet */
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skb = bt_skb_alloc(1, GFP_ATOMIC);
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if (!skb) {
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BT_ERR("cannot allocate memory for HCILL packet");
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err = -ENOMEM;
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goto out;
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}
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/* prepare packet */
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hcill_packet = (struct hcill_cmd *) skb_put(skb, 1);
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hcill_packet->cmd = cmd;
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skb->dev = (void *) hu->hdev;
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/* send packet */
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skb_queue_tail(&ll->txq, skb);
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out:
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return err;
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}
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/* Initialize protocol */
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static int ll_open(struct hci_uart *hu)
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{
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struct ll_struct *ll;
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BT_DBG("hu %p", hu);
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ll = kzalloc(sizeof(*ll), GFP_KERNEL);
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if (!ll)
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return -ENOMEM;
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skb_queue_head_init(&ll->txq);
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skb_queue_head_init(&ll->tx_wait_q);
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spin_lock_init(&ll->hcill_lock);
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ll->hcill_state = HCILL_AWAKE;
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hu->priv = ll;
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return 0;
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}
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/* Flush protocol data */
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static int ll_flush(struct hci_uart *hu)
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{
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struct ll_struct *ll = hu->priv;
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BT_DBG("hu %p", hu);
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skb_queue_purge(&ll->tx_wait_q);
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skb_queue_purge(&ll->txq);
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return 0;
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}
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/* Close protocol */
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static int ll_close(struct hci_uart *hu)
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{
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struct ll_struct *ll = hu->priv;
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BT_DBG("hu %p", hu);
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skb_queue_purge(&ll->tx_wait_q);
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skb_queue_purge(&ll->txq);
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kfree_skb(ll->rx_skb);
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hu->priv = NULL;
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kfree(ll);
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return 0;
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}
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/*
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* internal function, which does common work of the device wake up process:
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* 1. places all pending packets (waiting in tx_wait_q list) in txq list.
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* 2. changes internal state to HCILL_AWAKE.
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* Note: assumes that hcill_lock spinlock is taken,
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* shouldn't be called otherwise!
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*/
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static void __ll_do_awake(struct ll_struct *ll)
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{
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struct sk_buff *skb = NULL;
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while ((skb = skb_dequeue(&ll->tx_wait_q)))
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skb_queue_tail(&ll->txq, skb);
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ll->hcill_state = HCILL_AWAKE;
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}
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/*
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* Called upon a wake-up-indication from the device
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*/
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static void ll_device_want_to_wakeup(struct hci_uart *hu)
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{
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unsigned long flags;
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struct ll_struct *ll = hu->priv;
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BT_DBG("hu %p", hu);
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/* lock hcill state */
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spin_lock_irqsave(&ll->hcill_lock, flags);
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switch (ll->hcill_state) {
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case HCILL_ASLEEP_TO_AWAKE:
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/*
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* This state means that both the host and the BRF chip
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* have simultaneously sent a wake-up-indication packet.
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* Traditionally, in this case, receiving a wake-up-indication
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* was enough and an additional wake-up-ack wasn't needed.
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* This has changed with the BRF6350, which does require an
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* explicit wake-up-ack. Other BRF versions, which do not
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* require an explicit ack here, do accept it, thus it is
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* perfectly safe to always send one.
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*/
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BT_DBG("dual wake-up-indication");
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/* deliberate fall-through - do not add break */
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case HCILL_ASLEEP:
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/* acknowledge device wake up */
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if (send_hcill_cmd(HCILL_WAKE_UP_ACK, hu) < 0) {
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BT_ERR("cannot acknowledge device wake up");
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goto out;
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}
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break;
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default:
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/* any other state is illegal */
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BT_ERR("received HCILL_WAKE_UP_IND in state %ld", ll->hcill_state);
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break;
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}
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/* send pending packets and change state to HCILL_AWAKE */
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__ll_do_awake(ll);
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out:
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spin_unlock_irqrestore(&ll->hcill_lock, flags);
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/* actually send the packets */
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hci_uart_tx_wakeup(hu);
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}
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/*
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* Called upon a sleep-indication from the device
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*/
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static void ll_device_want_to_sleep(struct hci_uart *hu)
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{
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unsigned long flags;
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struct ll_struct *ll = hu->priv;
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BT_DBG("hu %p", hu);
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/* lock hcill state */
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spin_lock_irqsave(&ll->hcill_lock, flags);
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/* sanity check */
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if (ll->hcill_state != HCILL_AWAKE)
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BT_ERR("ERR: HCILL_GO_TO_SLEEP_IND in state %ld", ll->hcill_state);
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/* acknowledge device sleep */
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if (send_hcill_cmd(HCILL_GO_TO_SLEEP_ACK, hu) < 0) {
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BT_ERR("cannot acknowledge device sleep");
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goto out;
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}
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/* update state */
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ll->hcill_state = HCILL_ASLEEP;
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out:
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spin_unlock_irqrestore(&ll->hcill_lock, flags);
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/* actually send the sleep ack packet */
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hci_uart_tx_wakeup(hu);
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}
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/*
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* Called upon wake-up-acknowledgement from the device
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*/
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static void ll_device_woke_up(struct hci_uart *hu)
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{
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unsigned long flags;
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struct ll_struct *ll = hu->priv;
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BT_DBG("hu %p", hu);
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/* lock hcill state */
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spin_lock_irqsave(&ll->hcill_lock, flags);
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/* sanity check */
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if (ll->hcill_state != HCILL_ASLEEP_TO_AWAKE)
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BT_ERR("received HCILL_WAKE_UP_ACK in state %ld", ll->hcill_state);
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/* send pending packets and change state to HCILL_AWAKE */
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__ll_do_awake(ll);
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spin_unlock_irqrestore(&ll->hcill_lock, flags);
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/* actually send the packets */
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hci_uart_tx_wakeup(hu);
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}
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/* Enqueue frame for transmittion (padding, crc, etc) */
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/* may be called from two simultaneous tasklets */
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static int ll_enqueue(struct hci_uart *hu, struct sk_buff *skb)
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{
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unsigned long flags = 0;
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struct ll_struct *ll = hu->priv;
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BT_DBG("hu %p skb %p", hu, skb);
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/* Prepend skb with frame type */
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memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
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/* lock hcill state */
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spin_lock_irqsave(&ll->hcill_lock, flags);
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/* act according to current state */
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switch (ll->hcill_state) {
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case HCILL_AWAKE:
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BT_DBG("device awake, sending normally");
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skb_queue_tail(&ll->txq, skb);
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break;
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case HCILL_ASLEEP:
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BT_DBG("device asleep, waking up and queueing packet");
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/* save packet for later */
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skb_queue_tail(&ll->tx_wait_q, skb);
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/* awake device */
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if (send_hcill_cmd(HCILL_WAKE_UP_IND, hu) < 0) {
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BT_ERR("cannot wake up device");
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break;
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}
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ll->hcill_state = HCILL_ASLEEP_TO_AWAKE;
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break;
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case HCILL_ASLEEP_TO_AWAKE:
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BT_DBG("device waking up, queueing packet");
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/* transient state; just keep packet for later */
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skb_queue_tail(&ll->tx_wait_q, skb);
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break;
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default:
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BT_ERR("illegal hcill state: %ld (losing packet)", ll->hcill_state);
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kfree_skb(skb);
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break;
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}
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spin_unlock_irqrestore(&ll->hcill_lock, flags);
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return 0;
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}
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static inline int ll_check_data_len(struct ll_struct *ll, int len)
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{
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int room = skb_tailroom(ll->rx_skb);
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BT_DBG("len %d room %d", len, room);
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if (!len) {
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hci_recv_frame(ll->rx_skb);
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} else if (len > room) {
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BT_ERR("Data length is too large");
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kfree_skb(ll->rx_skb);
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} else {
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ll->rx_state = HCILL_W4_DATA;
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ll->rx_count = len;
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return len;
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}
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ll->rx_state = HCILL_W4_PACKET_TYPE;
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ll->rx_skb = NULL;
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ll->rx_count = 0;
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return 0;
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}
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/* Recv data */
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static int ll_recv(struct hci_uart *hu, void *data, int count)
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{
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struct ll_struct *ll = hu->priv;
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char *ptr;
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struct hci_event_hdr *eh;
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struct hci_acl_hdr *ah;
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struct hci_sco_hdr *sh;
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int len, type, dlen;
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BT_DBG("hu %p count %d rx_state %ld rx_count %ld", hu, count, ll->rx_state, ll->rx_count);
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ptr = data;
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while (count) {
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if (ll->rx_count) {
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len = min_t(unsigned int, ll->rx_count, count);
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memcpy(skb_put(ll->rx_skb, len), ptr, len);
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ll->rx_count -= len; count -= len; ptr += len;
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if (ll->rx_count)
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continue;
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switch (ll->rx_state) {
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case HCILL_W4_DATA:
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BT_DBG("Complete data");
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hci_recv_frame(ll->rx_skb);
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ll->rx_state = HCILL_W4_PACKET_TYPE;
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ll->rx_skb = NULL;
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continue;
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case HCILL_W4_EVENT_HDR:
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eh = hci_event_hdr(ll->rx_skb);
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BT_DBG("Event header: evt 0x%2.2x plen %d", eh->evt, eh->plen);
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ll_check_data_len(ll, eh->plen);
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continue;
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case HCILL_W4_ACL_HDR:
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ah = hci_acl_hdr(ll->rx_skb);
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dlen = __le16_to_cpu(ah->dlen);
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BT_DBG("ACL header: dlen %d", dlen);
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ll_check_data_len(ll, dlen);
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continue;
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case HCILL_W4_SCO_HDR:
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sh = hci_sco_hdr(ll->rx_skb);
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BT_DBG("SCO header: dlen %d", sh->dlen);
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ll_check_data_len(ll, sh->dlen);
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continue;
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}
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}
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/* HCILL_W4_PACKET_TYPE */
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switch (*ptr) {
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case HCI_EVENT_PKT:
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BT_DBG("Event packet");
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ll->rx_state = HCILL_W4_EVENT_HDR;
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ll->rx_count = HCI_EVENT_HDR_SIZE;
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type = HCI_EVENT_PKT;
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break;
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case HCI_ACLDATA_PKT:
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BT_DBG("ACL packet");
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ll->rx_state = HCILL_W4_ACL_HDR;
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ll->rx_count = HCI_ACL_HDR_SIZE;
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type = HCI_ACLDATA_PKT;
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break;
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case HCI_SCODATA_PKT:
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BT_DBG("SCO packet");
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ll->rx_state = HCILL_W4_SCO_HDR;
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ll->rx_count = HCI_SCO_HDR_SIZE;
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type = HCI_SCODATA_PKT;
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break;
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/* HCILL signals */
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case HCILL_GO_TO_SLEEP_IND:
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BT_DBG("HCILL_GO_TO_SLEEP_IND packet");
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ll_device_want_to_sleep(hu);
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ptr++; count--;
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continue;
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case HCILL_GO_TO_SLEEP_ACK:
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/* shouldn't happen */
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BT_ERR("received HCILL_GO_TO_SLEEP_ACK (in state %ld)", ll->hcill_state);
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ptr++; count--;
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continue;
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case HCILL_WAKE_UP_IND:
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BT_DBG("HCILL_WAKE_UP_IND packet");
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ll_device_want_to_wakeup(hu);
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ptr++; count--;
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continue;
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case HCILL_WAKE_UP_ACK:
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BT_DBG("HCILL_WAKE_UP_ACK packet");
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ll_device_woke_up(hu);
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ptr++; count--;
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continue;
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default:
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BT_ERR("Unknown HCI packet type %2.2x", (__u8)*ptr);
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hu->hdev->stat.err_rx++;
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ptr++; count--;
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continue;
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};
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ptr++; count--;
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/* Allocate packet */
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ll->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
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if (!ll->rx_skb) {
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BT_ERR("Can't allocate mem for new packet");
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ll->rx_state = HCILL_W4_PACKET_TYPE;
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ll->rx_count = 0;
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return -ENOMEM;
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}
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ll->rx_skb->dev = (void *) hu->hdev;
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bt_cb(ll->rx_skb)->pkt_type = type;
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}
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return count;
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}
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static struct sk_buff *ll_dequeue(struct hci_uart *hu)
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{
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struct ll_struct *ll = hu->priv;
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return skb_dequeue(&ll->txq);
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}
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static struct hci_uart_proto llp = {
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.id = HCI_UART_LL,
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.open = ll_open,
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.close = ll_close,
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.recv = ll_recv,
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.enqueue = ll_enqueue,
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.dequeue = ll_dequeue,
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.flush = ll_flush,
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};
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int __init ll_init(void)
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{
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int err = hci_uart_register_proto(&llp);
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if (!err)
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BT_INFO("HCILL protocol initialized");
|
|
else
|
|
BT_ERR("HCILL protocol registration failed");
|
|
|
|
return err;
|
|
}
|
|
|
|
int __exit ll_deinit(void)
|
|
{
|
|
return hci_uart_unregister_proto(&llp);
|
|
}
|