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![Xiaolei Wang](/assets/img/avatar_default.png)
When using the wl1271 Bluetooth function of am335x, it is found that the Bluetooth module cannot respond in time after Bluetooth is enabled, and a small delay is needed to work normally, so whether to add a small mdelay. Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
822 lines
19 KiB
C
822 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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fallthrough;
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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",
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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",
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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",
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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)",
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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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|
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return skb_dequeue(&ll->txq);
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}
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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,
|
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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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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;
|
|
}
|
|
|
|
version = le16_to_cpu(ver->lmp_subver);
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|
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out:
|
|
if (err)
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|
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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|
|
static int send_command_from_firmware(struct ll_device *lldev,
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struct hci_command *cmd)
|
|
{
|
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struct sk_buff *skb;
|
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|
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if (cmd->opcode == HCI_VS_UPDATE_UART_HCI_BAUDRATE) {
|
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/* ignore remote change
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* baud rate HCI VS command
|
|
*/
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bt_dev_warn(lldev->hu.hdev,
|
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"change remote baud rate command in firmware");
|
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return 0;
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}
|
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if (cmd->prefix != 1)
|
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bt_dev_dbg(lldev->hu.hdev, "command type %d", cmd->prefix);
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|
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skb = __hci_cmd_sync(lldev->hu.hdev, cmd->opcode, cmd->plen,
|
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&cmd->speed, HCI_INIT_TIMEOUT);
|
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if (IS_ERR(skb)) {
|
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bt_dev_err(lldev->hu.hdev, "send command failed");
|
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return PTR_ERR(skb);
|
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}
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* download_firmware -
|
|
* internal function which parses through the .bts firmware
|
|
* script file intreprets SEND, DELAY actions only as of now
|
|
*/
|
|
static int download_firmware(struct ll_device *lldev)
|
|
{
|
|
unsigned short chip, min_ver, maj_ver;
|
|
int version, err, len;
|
|
unsigned char *ptr, *action_ptr;
|
|
unsigned char bts_scr_name[40]; /* 40 char long bts scr name? */
|
|
const struct firmware *fw;
|
|
struct hci_command *cmd;
|
|
|
|
version = read_local_version(lldev->hu.hdev);
|
|
if (version < 0)
|
|
return version;
|
|
|
|
chip = (version & 0x7C00) >> 10;
|
|
min_ver = (version & 0x007F);
|
|
maj_ver = (version & 0x0380) >> 7;
|
|
if (version & 0x8000)
|
|
maj_ver |= 0x0008;
|
|
|
|
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;
|
|
err = send_command_from_firmware(lldev, cmd);
|
|
if (err)
|
|
goto out_rel_fw;
|
|
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);
|
|
mdelay(100);
|
|
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);
|
|
}
|