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822 lines
19 KiB
822 lines
19 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
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* Texas Instruments' Bluetooth HCILL UART protocol |
|
* |
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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 <[email protected]> |
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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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|
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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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|
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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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|
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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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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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|
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BT_DBG("hu %p cmd 0x%x", hu, cmd); |
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|
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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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|
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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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|
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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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|
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BT_DBG("hu %p", hu); |
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|
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skb_queue_purge(&ll->tx_wait_q); |
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skb_queue_purge(&ll->txq); |
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|
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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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|
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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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|
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clk_disable_unprepare(lldev->ext_clk); |
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} |
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|
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hu->priv = NULL; |
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|
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kfree(ll); |
|
|
|
return 0; |
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} |
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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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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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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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|
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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: |
|
/* |
|
* This state means that both the host and the BRF chip |
|
* have simultaneously sent a wake-up-indication packet. |
|
* 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 |
|
* perfectly safe to always send one. |
|
*/ |
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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"); |
|
goto out; |
|
} |
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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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/* send pending packets and change state to HCILL_AWAKE */ |
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__ll_do_awake(ll); |
|
|
|
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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} |
|
|
|
/* |
|
* Called upon a sleep-indication from the device |
|
*/ |
|
static void ll_device_want_to_sleep(struct hci_uart *hu) |
|
{ |
|
unsigned long flags; |
|
struct ll_struct *ll = hu->priv; |
|
|
|
BT_DBG("hu %p", hu); |
|
|
|
/* lock hcill state */ |
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spin_lock_irqsave(&ll->hcill_lock, flags); |
|
|
|
/* sanity check */ |
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if (ll->hcill_state != HCILL_AWAKE) |
|
BT_ERR("ERR: HCILL_GO_TO_SLEEP_IND in state %ld", |
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ll->hcill_state); |
|
|
|
/* acknowledge device sleep */ |
|
if (send_hcill_cmd(HCILL_GO_TO_SLEEP_ACK, hu) < 0) { |
|
BT_ERR("cannot acknowledge device sleep"); |
|
goto out; |
|
} |
|
|
|
/* update state */ |
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ll->hcill_state = HCILL_ASLEEP; |
|
|
|
out: |
|
spin_unlock_irqrestore(&ll->hcill_lock, flags); |
|
|
|
/* actually send the sleep ack packet */ |
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hci_uart_tx_wakeup(hu); |
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} |
|
|
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/* |
|
* Called upon wake-up-acknowledgement from the device |
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*/ |
|
static void ll_device_woke_up(struct hci_uart *hu) |
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{ |
|
unsigned long flags; |
|
struct ll_struct *ll = hu->priv; |
|
|
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BT_DBG("hu %p", hu); |
|
|
|
/* lock hcill state */ |
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spin_lock_irqsave(&ll->hcill_lock, flags); |
|
|
|
/* sanity check */ |
|
if (ll->hcill_state != HCILL_ASLEEP_TO_AWAKE) |
|
BT_ERR("received HCILL_WAKE_UP_ACK in state %ld", |
|
ll->hcill_state); |
|
|
|
/* send pending packets and change state to HCILL_AWAKE */ |
|
__ll_do_awake(ll); |
|
|
|
spin_unlock_irqrestore(&ll->hcill_lock, flags); |
|
|
|
/* actually send the packets */ |
|
hci_uart_tx_wakeup(hu); |
|
} |
|
|
|
/* Enqueue frame for transmittion (padding, crc, etc) */ |
|
/* may be called from two simultaneous tasklets */ |
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static int ll_enqueue(struct hci_uart *hu, struct sk_buff *skb) |
|
{ |
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unsigned long flags = 0; |
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struct ll_struct *ll = hu->priv; |
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|
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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 */ |
|
switch (ll->hcill_state) { |
|
case HCILL_AWAKE: |
|
BT_DBG("device awake, sending normally"); |
|
skb_queue_tail(&ll->txq, skb); |
|
break; |
|
case HCILL_ASLEEP: |
|
BT_DBG("device asleep, waking up and queueing packet"); |
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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) { |
|
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: |
|
BT_DBG("HCILL_GO_TO_SLEEP_IND packet"); |
|
ll_device_want_to_sleep(hu); |
|
break; |
|
case HCILL_GO_TO_SLEEP_ACK: |
|
/* shouldn't happen */ |
|
bt_dev_err(hdev, "received HCILL_GO_TO_SLEEP_ACK in state %ld", |
|
ll->hcill_state); |
|
break; |
|
case HCILL_WAKE_UP_IND: |
|
BT_DBG("HCILL_WAKE_UP_IND packet"); |
|
ll_device_want_to_wakeup(hu); |
|
break; |
|
case HCILL_WAKE_UP_ACK: |
|
BT_DBG("HCILL_WAKE_UP_ACK packet"); |
|
ll_device_woke_up(hu); |
|
break; |
|
} |
|
|
|
kfree_skb(skb); |
|
return 0; |
|
} |
|
|
|
#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, \ |
|
.lsize = 0, \ |
|
.maxlen = 0 |
|
|
|
#define LL_RECV_SLEEP_ACK \ |
|
.type = HCILL_GO_TO_SLEEP_ACK, \ |
|
.hlen = 0, \ |
|
.loff = 0, \ |
|
.lsize = 0, \ |
|
.maxlen = 0 |
|
|
|
#define LL_RECV_WAKE_IND \ |
|
.type = HCILL_WAKE_UP_IND, \ |
|
.hlen = 0, \ |
|
.loff = 0, \ |
|
.lsize = 0, \ |
|
.maxlen = 0 |
|
|
|
#define LL_RECV_WAKE_ACK \ |
|
.type = HCILL_WAKE_UP_ACK, \ |
|
.hlen = 0, \ |
|
.loff = 0, \ |
|
.lsize = 0, \ |
|
.maxlen = 0 |
|
|
|
static const struct h4_recv_pkt ll_recv_pkts[] = { |
|
{ H4_RECV_ACL, .recv = hci_recv_frame }, |
|
{ H4_RECV_SCO, .recv = hci_recv_frame }, |
|
{ H4_RECV_EVENT, .recv = hci_recv_frame }, |
|
{ LL_RECV_SLEEP_IND, .recv = ll_recv_frame }, |
|
{ LL_RECV_SLEEP_ACK, .recv = ll_recv_frame }, |
|
{ LL_RECV_WAKE_IND, .recv = ll_recv_frame }, |
|
{ LL_RECV_WAKE_ACK, .recv = ll_recv_frame }, |
|
}; |
|
|
|
/* Recv data */ |
|
static int ll_recv(struct hci_uart *hu, const void *data, int count) |
|
{ |
|
struct ll_struct *ll = hu->priv; |
|
|
|
if (!test_bit(HCI_UART_REGISTERED, &hu->flags)) |
|
return -EUNATCH; |
|
|
|
ll->rx_skb = h4_recv_buf(hu->hdev, ll->rx_skb, data, count, |
|
ll_recv_pkts, ARRAY_SIZE(ll_recv_pkts)); |
|
if (IS_ERR(ll->rx_skb)) { |
|
int err = PTR_ERR(ll->rx_skb); |
|
bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err); |
|
ll->rx_skb = NULL; |
|
return err; |
|
} |
|
|
|
return count; |
|
} |
|
|
|
static struct sk_buff *ll_dequeue(struct hci_uart *hu) |
|
{ |
|
struct ll_struct *ll = hu->priv; |
|
|
|
return skb_dequeue(&ll->txq); |
|
} |
|
|
|
#if IS_ENABLED(CONFIG_SERIAL_DEV_BUS) |
|
static int read_local_version(struct hci_dev *hdev) |
|
{ |
|
int err = 0; |
|
unsigned short version = 0; |
|
struct sk_buff *skb; |
|
struct hci_rp_read_local_version *ver; |
|
|
|
skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL, |
|
HCI_INIT_TIMEOUT); |
|
if (IS_ERR(skb)) { |
|
bt_dev_err(hdev, "Reading TI version information failed (%ld)", |
|
PTR_ERR(skb)); |
|
return PTR_ERR(skb); |
|
} |
|
if (skb->len != sizeof(*ver)) { |
|
err = -EILSEQ; |
|
goto out; |
|
} |
|
|
|
ver = (struct hci_rp_read_local_version *)skb->data; |
|
if (le16_to_cpu(ver->manufacturer) != 13) { |
|
err = -ENODEV; |
|
goto out; |
|
} |
|
|
|
version = le16_to_cpu(ver->lmp_subver); |
|
|
|
out: |
|
if (err) |
|
bt_dev_err(hdev, "Failed to read TI version info: %d", err); |
|
kfree_skb(skb); |
|
return err ? err : version; |
|
} |
|
|
|
static int send_command_from_firmware(struct ll_device *lldev, |
|
struct hci_command *cmd) |
|
{ |
|
struct sk_buff *skb; |
|
|
|
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"); |
|
return 0; |
|
} |
|
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"); |
|
return PTR_ERR(skb); |
|
} |
|
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); |
|
}
|
|
|