![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 136 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190530000436.384967451@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
800 lines
19 KiB
C
800 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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/firmware.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/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/of.h>
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#include <linux/serdev.h>
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#include <linux/skbuff.h>
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#include <linux/ti_wilink_st.h>
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#include <linux/clk.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 <linux/gpio/consumer.h>
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#include <linux/nvmem-consumer.h>
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#include "hci_uart.h"
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/* Vendor-specific HCI commands */
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#define HCI_VS_WRITE_BD_ADDR 0xfc06
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#define HCI_VS_UPDATE_UART_HCI_BAUDRATE 0xff36
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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 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 ll_device {
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struct hci_uart hu;
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struct serdev_device *serdev;
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struct gpio_desc *enable_gpio;
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struct clk *ext_clk;
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bdaddr_t bdaddr;
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};
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struct ll_struct {
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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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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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skb_put_u8(skb, cmd);
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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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if (hu->serdev) {
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struct ll_device *lldev = serdev_device_get_drvdata(hu->serdev);
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if (!IS_ERR(lldev->ext_clk))
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clk_prepare_enable(lldev->ext_clk);
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}
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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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if (hu->serdev) {
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struct ll_device *lldev = serdev_device_get_drvdata(hu->serdev);
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gpiod_set_value_cansleep(lldev->enable_gpio, 0);
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clk_disable_unprepare(lldev->ext_clk);
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}
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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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/* fall through */
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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), &hci_skb_pkt_type(skb), 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 int ll_recv_frame(struct hci_dev *hdev, struct sk_buff *skb)
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{
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struct hci_uart *hu = hci_get_drvdata(hdev);
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struct ll_struct *ll = hu->priv;
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switch (hci_skb_pkt_type(skb)) {
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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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break;
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case HCILL_GO_TO_SLEEP_ACK:
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/* shouldn't happen */
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bt_dev_err(hdev, "received HCILL_GO_TO_SLEEP_ACK in state %ld",
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ll->hcill_state);
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break;
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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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break;
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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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break;
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}
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kfree_skb(skb);
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return 0;
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}
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#define LL_RECV_SLEEP_IND \
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.type = HCILL_GO_TO_SLEEP_IND, \
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.hlen = 0, \
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.loff = 0, \
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.lsize = 0, \
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.maxlen = 0
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#define LL_RECV_SLEEP_ACK \
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.type = HCILL_GO_TO_SLEEP_ACK, \
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.hlen = 0, \
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.loff = 0, \
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.lsize = 0, \
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.maxlen = 0
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#define LL_RECV_WAKE_IND \
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.type = HCILL_WAKE_UP_IND, \
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.hlen = 0, \
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.loff = 0, \
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.lsize = 0, \
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.maxlen = 0
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#define LL_RECV_WAKE_ACK \
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.type = HCILL_WAKE_UP_ACK, \
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.hlen = 0, \
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.loff = 0, \
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.lsize = 0, \
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.maxlen = 0
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static const struct h4_recv_pkt ll_recv_pkts[] = {
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{ H4_RECV_ACL, .recv = hci_recv_frame },
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{ H4_RECV_SCO, .recv = hci_recv_frame },
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{ H4_RECV_EVENT, .recv = hci_recv_frame },
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{ LL_RECV_SLEEP_IND, .recv = ll_recv_frame },
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{ LL_RECV_SLEEP_ACK, .recv = ll_recv_frame },
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{ LL_RECV_WAKE_IND, .recv = ll_recv_frame },
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{ LL_RECV_WAKE_ACK, .recv = ll_recv_frame },
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};
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/* Recv data */
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static int ll_recv(struct hci_uart *hu, const void *data, int count)
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{
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struct ll_struct *ll = hu->priv;
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if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
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return -EUNATCH;
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ll->rx_skb = h4_recv_buf(hu->hdev, ll->rx_skb, data, count,
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ll_recv_pkts, ARRAY_SIZE(ll_recv_pkts));
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if (IS_ERR(ll->rx_skb)) {
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int err = PTR_ERR(ll->rx_skb);
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bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
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ll->rx_skb = NULL;
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return err;
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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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#if IS_ENABLED(CONFIG_SERIAL_DEV_BUS)
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static int read_local_version(struct hci_dev *hdev)
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{
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int err = 0;
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unsigned short version = 0;
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struct sk_buff *skb;
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struct hci_rp_read_local_version *ver;
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skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL, HCI_INIT_TIMEOUT);
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if (IS_ERR(skb)) {
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bt_dev_err(hdev, "Reading TI version information failed (%ld)",
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PTR_ERR(skb));
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return PTR_ERR(skb);
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}
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if (skb->len != sizeof(*ver)) {
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err = -EILSEQ;
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goto out;
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}
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ver = (struct hci_rp_read_local_version *)skb->data;
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if (le16_to_cpu(ver->manufacturer) != 13) {
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err = -ENODEV;
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goto out;
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}
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version = le16_to_cpu(ver->lmp_subver);
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out:
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if (err) bt_dev_err(hdev, "Failed to read TI version info: %d", err);
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kfree_skb(skb);
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return err ? err : version;
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}
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/**
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* download_firmware -
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* internal function which parses through the .bts firmware
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* script file intreprets SEND, DELAY actions only as of now
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*/
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static int download_firmware(struct ll_device *lldev)
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{
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unsigned short chip, min_ver, maj_ver;
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int version, err, len;
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unsigned char *ptr, *action_ptr;
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unsigned char bts_scr_name[40]; /* 40 char long bts scr name? */
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const struct firmware *fw;
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struct sk_buff *skb;
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struct hci_command *cmd;
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version = read_local_version(lldev->hu.hdev);
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if (version < 0)
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return version;
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chip = (version & 0x7C00) >> 10;
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min_ver = (version & 0x007F);
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maj_ver = (version & 0x0380) >> 7;
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if (version & 0x8000)
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maj_ver |= 0x0008;
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|
|
snprintf(bts_scr_name, sizeof(bts_scr_name),
|
|
"ti-connectivity/TIInit_%d.%d.%d.bts",
|
|
chip, maj_ver, min_ver);
|
|
|
|
err = request_firmware(&fw, bts_scr_name, &lldev->serdev->dev);
|
|
if (err || !fw->data || !fw->size) {
|
|
bt_dev_err(lldev->hu.hdev, "request_firmware failed(errno %d) for %s",
|
|
err, bts_scr_name);
|
|
return -EINVAL;
|
|
}
|
|
ptr = (void *)fw->data;
|
|
len = fw->size;
|
|
/* bts_header to remove out magic number and
|
|
* version
|
|
*/
|
|
ptr += sizeof(struct bts_header);
|
|
len -= sizeof(struct bts_header);
|
|
|
|
while (len > 0 && ptr) {
|
|
bt_dev_dbg(lldev->hu.hdev, " action size %d, type %d ",
|
|
((struct bts_action *)ptr)->size,
|
|
((struct bts_action *)ptr)->type);
|
|
|
|
action_ptr = &(((struct bts_action *)ptr)->data[0]);
|
|
|
|
switch (((struct bts_action *)ptr)->type) {
|
|
case ACTION_SEND_COMMAND: /* action send */
|
|
bt_dev_dbg(lldev->hu.hdev, "S");
|
|
cmd = (struct hci_command *)action_ptr;
|
|
if (cmd->opcode == HCI_VS_UPDATE_UART_HCI_BAUDRATE) {
|
|
/* ignore remote change
|
|
* baud rate HCI VS command
|
|
*/
|
|
bt_dev_warn(lldev->hu.hdev, "change remote baud rate command in firmware");
|
|
break;
|
|
}
|
|
if (cmd->prefix != 1)
|
|
bt_dev_dbg(lldev->hu.hdev, "command type %d", cmd->prefix);
|
|
|
|
skb = __hci_cmd_sync(lldev->hu.hdev, cmd->opcode, cmd->plen, &cmd->speed, HCI_INIT_TIMEOUT);
|
|
if (IS_ERR(skb)) {
|
|
bt_dev_err(lldev->hu.hdev, "send command failed");
|
|
err = PTR_ERR(skb);
|
|
goto out_rel_fw;
|
|
}
|
|
kfree_skb(skb);
|
|
break;
|
|
case ACTION_WAIT_EVENT: /* wait */
|
|
/* no need to wait as command was synchronous */
|
|
bt_dev_dbg(lldev->hu.hdev, "W");
|
|
break;
|
|
case ACTION_DELAY: /* sleep */
|
|
bt_dev_info(lldev->hu.hdev, "sleep command in scr");
|
|
msleep(((struct bts_action_delay *)action_ptr)->msec);
|
|
break;
|
|
}
|
|
len -= (sizeof(struct bts_action) +
|
|
((struct bts_action *)ptr)->size);
|
|
ptr += sizeof(struct bts_action) +
|
|
((struct bts_action *)ptr)->size;
|
|
}
|
|
|
|
out_rel_fw:
|
|
/* fw download complete */
|
|
release_firmware(fw);
|
|
return err;
|
|
}
|
|
|
|
static int ll_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
|
|
{
|
|
bdaddr_t bdaddr_swapped;
|
|
struct sk_buff *skb;
|
|
|
|
/* HCI_VS_WRITE_BD_ADDR (at least on a CC2560A chip) expects the BD
|
|
* address to be MSB first, but bdaddr_t has the convention of being
|
|
* LSB first.
|
|
*/
|
|
baswap(&bdaddr_swapped, bdaddr);
|
|
skb = __hci_cmd_sync(hdev, HCI_VS_WRITE_BD_ADDR, sizeof(bdaddr_t),
|
|
&bdaddr_swapped, HCI_INIT_TIMEOUT);
|
|
if (!IS_ERR(skb))
|
|
kfree_skb(skb);
|
|
|
|
return PTR_ERR_OR_ZERO(skb);
|
|
}
|
|
|
|
static int ll_setup(struct hci_uart *hu)
|
|
{
|
|
int err, retry = 3;
|
|
struct ll_device *lldev;
|
|
struct serdev_device *serdev = hu->serdev;
|
|
u32 speed;
|
|
|
|
if (!serdev)
|
|
return 0;
|
|
|
|
lldev = serdev_device_get_drvdata(serdev);
|
|
|
|
hu->hdev->set_bdaddr = ll_set_bdaddr;
|
|
|
|
serdev_device_set_flow_control(serdev, true);
|
|
|
|
do {
|
|
/* Reset the Bluetooth device */
|
|
gpiod_set_value_cansleep(lldev->enable_gpio, 0);
|
|
msleep(5);
|
|
gpiod_set_value_cansleep(lldev->enable_gpio, 1);
|
|
err = serdev_device_wait_for_cts(serdev, true, 200);
|
|
if (err) {
|
|
bt_dev_err(hu->hdev, "Failed to get CTS");
|
|
return err;
|
|
}
|
|
|
|
err = download_firmware(lldev);
|
|
if (!err)
|
|
break;
|
|
|
|
/* Toggle BT_EN and retry */
|
|
bt_dev_err(hu->hdev, "download firmware failed, retrying...");
|
|
} while (retry--);
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
/* Set BD address if one was specified at probe */
|
|
if (!bacmp(&lldev->bdaddr, BDADDR_NONE)) {
|
|
/* This means that there was an error getting the BD address
|
|
* during probe, so mark the device as having a bad address.
|
|
*/
|
|
set_bit(HCI_QUIRK_INVALID_BDADDR, &hu->hdev->quirks);
|
|
} else if (bacmp(&lldev->bdaddr, BDADDR_ANY)) {
|
|
err = ll_set_bdaddr(hu->hdev, &lldev->bdaddr);
|
|
if (err)
|
|
set_bit(HCI_QUIRK_INVALID_BDADDR, &hu->hdev->quirks);
|
|
}
|
|
|
|
/* 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) {
|
|
__le32 speed_le = cpu_to_le32(speed);
|
|
struct sk_buff *skb;
|
|
|
|
skb = __hci_cmd_sync(hu->hdev, HCI_VS_UPDATE_UART_HCI_BAUDRATE,
|
|
sizeof(speed_le), &speed_le,
|
|
HCI_INIT_TIMEOUT);
|
|
if (!IS_ERR(skb)) {
|
|
kfree_skb(skb);
|
|
serdev_device_set_baudrate(serdev, speed);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct hci_uart_proto llp;
|
|
|
|
static int hci_ti_probe(struct serdev_device *serdev)
|
|
{
|
|
struct hci_uart *hu;
|
|
struct ll_device *lldev;
|
|
struct nvmem_cell *bdaddr_cell;
|
|
u32 max_speed = 3000000;
|
|
|
|
lldev = devm_kzalloc(&serdev->dev, sizeof(struct ll_device), GFP_KERNEL);
|
|
if (!lldev)
|
|
return -ENOMEM;
|
|
hu = &lldev->hu;
|
|
|
|
serdev_device_set_drvdata(serdev, lldev);
|
|
lldev->serdev = hu->serdev = serdev;
|
|
|
|
lldev->enable_gpio = devm_gpiod_get_optional(&serdev->dev, "enable", GPIOD_OUT_LOW);
|
|
if (IS_ERR(lldev->enable_gpio))
|
|
return PTR_ERR(lldev->enable_gpio);
|
|
|
|
lldev->ext_clk = devm_clk_get(&serdev->dev, "ext_clock");
|
|
if (IS_ERR(lldev->ext_clk) && PTR_ERR(lldev->ext_clk) != -ENOENT)
|
|
return PTR_ERR(lldev->ext_clk);
|
|
|
|
of_property_read_u32(serdev->dev.of_node, "max-speed", &max_speed);
|
|
hci_uart_set_speeds(hu, 115200, max_speed);
|
|
|
|
/* optional BD address from nvram */
|
|
bdaddr_cell = nvmem_cell_get(&serdev->dev, "bd-address");
|
|
if (IS_ERR(bdaddr_cell)) {
|
|
int err = PTR_ERR(bdaddr_cell);
|
|
|
|
if (err == -EPROBE_DEFER)
|
|
return err;
|
|
|
|
/* ENOENT means there is no matching nvmem cell and ENOSYS
|
|
* means that nvmem is not enabled in the kernel configuration.
|
|
*/
|
|
if (err != -ENOENT && err != -ENOSYS) {
|
|
/* If there was some other error, give userspace a
|
|
* chance to fix the problem instead of failing to load
|
|
* the driver. Using BDADDR_NONE as a flag that is
|
|
* tested later in the setup function.
|
|
*/
|
|
dev_warn(&serdev->dev,
|
|
"Failed to get \"bd-address\" nvmem cell (%d)\n",
|
|
err);
|
|
bacpy(&lldev->bdaddr, BDADDR_NONE);
|
|
}
|
|
} else {
|
|
bdaddr_t *bdaddr;
|
|
size_t len;
|
|
|
|
bdaddr = nvmem_cell_read(bdaddr_cell, &len);
|
|
nvmem_cell_put(bdaddr_cell);
|
|
if (IS_ERR(bdaddr)) {
|
|
dev_err(&serdev->dev, "Failed to read nvmem bd-address\n");
|
|
return PTR_ERR(bdaddr);
|
|
}
|
|
if (len != sizeof(bdaddr_t)) {
|
|
dev_err(&serdev->dev, "Invalid nvmem bd-address length\n");
|
|
kfree(bdaddr);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* As per the device tree bindings, the value from nvmem is
|
|
* expected to be MSB first, but in the kernel it is expected
|
|
* that bdaddr_t is LSB first.
|
|
*/
|
|
baswap(&lldev->bdaddr, bdaddr);
|
|
kfree(bdaddr);
|
|
}
|
|
|
|
return hci_uart_register_device(hu, &llp);
|
|
}
|
|
|
|
static void hci_ti_remove(struct serdev_device *serdev)
|
|
{
|
|
struct ll_device *lldev = serdev_device_get_drvdata(serdev);
|
|
|
|
hci_uart_unregister_device(&lldev->hu);
|
|
}
|
|
|
|
static const struct of_device_id hci_ti_of_match[] = {
|
|
{ .compatible = "ti,cc2560" },
|
|
{ .compatible = "ti,wl1271-st" },
|
|
{ .compatible = "ti,wl1273-st" },
|
|
{ .compatible = "ti,wl1281-st" },
|
|
{ .compatible = "ti,wl1283-st" },
|
|
{ .compatible = "ti,wl1285-st" },
|
|
{ .compatible = "ti,wl1801-st" },
|
|
{ .compatible = "ti,wl1805-st" },
|
|
{ .compatible = "ti,wl1807-st" },
|
|
{ .compatible = "ti,wl1831-st" },
|
|
{ .compatible = "ti,wl1835-st" },
|
|
{ .compatible = "ti,wl1837-st" },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, hci_ti_of_match);
|
|
|
|
static struct serdev_device_driver hci_ti_drv = {
|
|
.driver = {
|
|
.name = "hci-ti",
|
|
.of_match_table = of_match_ptr(hci_ti_of_match),
|
|
},
|
|
.probe = hci_ti_probe,
|
|
.remove = hci_ti_remove,
|
|
};
|
|
#else
|
|
#define ll_setup NULL
|
|
#endif
|
|
|
|
static const struct hci_uart_proto llp = {
|
|
.id = HCI_UART_LL,
|
|
.name = "LL",
|
|
.setup = ll_setup,
|
|
.open = ll_open,
|
|
.close = ll_close,
|
|
.recv = ll_recv,
|
|
.enqueue = ll_enqueue,
|
|
.dequeue = ll_dequeue,
|
|
.flush = ll_flush,
|
|
};
|
|
|
|
int __init ll_init(void)
|
|
{
|
|
serdev_device_driver_register(&hci_ti_drv);
|
|
|
|
return hci_uart_register_proto(&llp);
|
|
}
|
|
|
|
int __exit ll_deinit(void)
|
|
{
|
|
serdev_device_driver_unregister(&hci_ti_drv);
|
|
|
|
return hci_uart_unregister_proto(&llp);
|
|
}
|