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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
Here is the big set of tty and serial driver changes for 6.6-rc1. Lots of cleanups in here this cycle, and some driver updates. Short summary is: - Jiri's continued work to make the tty code and apis be a bit more sane with regards to modern kernel coding style and types - cpm_uart driver updates - n_gsm updates and fixes - meson driver updates - sc16is7xx driver updates - 8250 driver updates for different hardware types - qcom-geni driver fixes - tegra serial driver change - stm32 driver updates - synclink_gt driver cleanups - tty structure size reduction All of these have been in linux-next this week with no reported issues. The last bit of cleanups from Jiri and the tty structure size reduction came in last week, a bit late but as they were just style changes and size reductions, I figured they should get into this merge cycle so that others can work on top of them with no merge conflicts. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> -----BEGIN PGP SIGNATURE----- iG0EABECAC0WIQT0tgzFv3jCIUoxPcsxR9QN2y37KQUCZPH+jA8cZ3JlZ0Brcm9h aC5jb20ACgkQMUfUDdst+ykKyACgldt6QeenTN+6dXIHS/eQHtTKZwMAn3arSeXI QrUUnLFjOWyoX87tbMBQ =LVw0 -----END PGP SIGNATURE----- Merge tag 'tty-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty Pull tty/serial driver updates from Greg KH: "Here is the big set of tty and serial driver changes for 6.6-rc1. Lots of cleanups in here this cycle, and some driver updates. Short summary is: - Jiri's continued work to make the tty code and apis be a bit more sane with regards to modern kernel coding style and types - cpm_uart driver updates - n_gsm updates and fixes - meson driver updates - sc16is7xx driver updates - 8250 driver updates for different hardware types - qcom-geni driver fixes - tegra serial driver change - stm32 driver updates - synclink_gt driver cleanups - tty structure size reduction All of these have been in linux-next this week with no reported issues. The last bit of cleanups from Jiri and the tty structure size reduction came in last week, a bit late but as they were just style changes and size reductions, I figured they should get into this merge cycle so that others can work on top of them with no merge conflicts" * tag 'tty-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (199 commits) tty: shrink the size of struct tty_struct by 40 bytes tty: n_tty: deduplicate copy code in n_tty_receive_buf_real_raw() tty: n_tty: extract ECHO_OP processing to a separate function tty: n_tty: unify counts to size_t tty: n_tty: use u8 for chars and flags tty: n_tty: simplify chars_in_buffer() tty: n_tty: remove unsigned char casts from character constants tty: n_tty: move newline handling to a separate function tty: n_tty: move canon handling to a separate function tty: n_tty: use MASK() for masking out size bits tty: n_tty: make n_tty_data::num_overrun unsigned tty: n_tty: use time_is_before_jiffies() in n_tty_receive_overrun() tty: n_tty: use 'num' for writes' counts tty: n_tty: use output character directly tty: n_tty: make flow of n_tty_receive_buf_common() a bool Revert "tty: serial: meson: Add a earlycon for the T7 SoC" Documentation: devices.txt: Fix minors for ttyCPM* Documentation: devices.txt: Remove ttySIOC* Documentation: devices.txt: Remove ttyIOC* serial: 8250_bcm7271: improve bcm7271 8250 port ...
926 lines
20 KiB
C
926 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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*
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* Bluetooth HCI UART driver
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*
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* Copyright (C) 2000-2001 Qualcomm Incorporated
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* Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
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* Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org>
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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/types.h>
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#include <linux/fcntl.h>
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#include <linux/interrupt.h>
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#include <linux/ptrace.h>
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#include <linux/poll.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/signal.h>
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#include <linux/ioctl.h>
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#include <linux/skbuff.h>
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#include <linux/firmware.h>
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#include <linux/serdev.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 "btintel.h"
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#include "btbcm.h"
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#include "hci_uart.h"
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#define VERSION "2.3"
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static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
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int hci_uart_register_proto(const struct hci_uart_proto *p)
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{
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if (p->id >= HCI_UART_MAX_PROTO)
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return -EINVAL;
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if (hup[p->id])
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return -EEXIST;
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hup[p->id] = p;
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BT_INFO("HCI UART protocol %s registered", p->name);
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return 0;
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}
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int hci_uart_unregister_proto(const struct hci_uart_proto *p)
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{
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if (p->id >= HCI_UART_MAX_PROTO)
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return -EINVAL;
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if (!hup[p->id])
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return -EINVAL;
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hup[p->id] = NULL;
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return 0;
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}
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static const struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
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{
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if (id >= HCI_UART_MAX_PROTO)
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return NULL;
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return hup[id];
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}
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static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
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{
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struct hci_dev *hdev = hu->hdev;
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/* Update HCI stat counters */
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switch (pkt_type) {
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case HCI_COMMAND_PKT:
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hdev->stat.cmd_tx++;
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break;
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case HCI_ACLDATA_PKT:
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hdev->stat.acl_tx++;
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break;
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case HCI_SCODATA_PKT:
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hdev->stat.sco_tx++;
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break;
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}
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}
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static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
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{
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struct sk_buff *skb = hu->tx_skb;
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if (!skb) {
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percpu_down_read(&hu->proto_lock);
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if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
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skb = hu->proto->dequeue(hu);
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percpu_up_read(&hu->proto_lock);
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} else {
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hu->tx_skb = NULL;
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}
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return skb;
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}
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int hci_uart_tx_wakeup(struct hci_uart *hu)
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{
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/* This may be called in an IRQ context, so we can't sleep. Therefore
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* we try to acquire the lock only, and if that fails we assume the
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* tty is being closed because that is the only time the write lock is
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* acquired. If, however, at some point in the future the write lock
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* is also acquired in other situations, then this must be revisited.
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*/
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if (!percpu_down_read_trylock(&hu->proto_lock))
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return 0;
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if (!test_bit(HCI_UART_PROTO_READY, &hu->flags))
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goto no_schedule;
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set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
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if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state))
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goto no_schedule;
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BT_DBG("");
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schedule_work(&hu->write_work);
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no_schedule:
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percpu_up_read(&hu->proto_lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(hci_uart_tx_wakeup);
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static void hci_uart_write_work(struct work_struct *work)
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{
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struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
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struct tty_struct *tty = hu->tty;
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struct hci_dev *hdev = hu->hdev;
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struct sk_buff *skb;
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/* REVISIT: should we cope with bad skbs or ->write() returning
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* and error value ?
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*/
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restart:
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clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
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while ((skb = hci_uart_dequeue(hu))) {
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int len;
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set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
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len = tty->ops->write(tty, skb->data, skb->len);
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hdev->stat.byte_tx += len;
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skb_pull(skb, len);
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if (skb->len) {
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hu->tx_skb = skb;
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break;
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}
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hci_uart_tx_complete(hu, hci_skb_pkt_type(skb));
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kfree_skb(skb);
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}
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clear_bit(HCI_UART_SENDING, &hu->tx_state);
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if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
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goto restart;
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wake_up_bit(&hu->tx_state, HCI_UART_SENDING);
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}
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void hci_uart_init_work(struct work_struct *work)
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{
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struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
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int err;
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struct hci_dev *hdev;
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if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
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return;
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err = hci_register_dev(hu->hdev);
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if (err < 0) {
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BT_ERR("Can't register HCI device");
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clear_bit(HCI_UART_PROTO_READY, &hu->flags);
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hu->proto->close(hu);
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hdev = hu->hdev;
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hu->hdev = NULL;
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hci_free_dev(hdev);
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return;
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}
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set_bit(HCI_UART_REGISTERED, &hu->flags);
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}
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int hci_uart_init_ready(struct hci_uart *hu)
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{
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if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
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return -EALREADY;
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schedule_work(&hu->init_ready);
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return 0;
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}
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int hci_uart_wait_until_sent(struct hci_uart *hu)
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{
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return wait_on_bit_timeout(&hu->tx_state, HCI_UART_SENDING,
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TASK_INTERRUPTIBLE,
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msecs_to_jiffies(2000));
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}
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/* ------- Interface to HCI layer ------ */
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/* Reset device */
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static int hci_uart_flush(struct hci_dev *hdev)
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{
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struct hci_uart *hu = hci_get_drvdata(hdev);
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struct tty_struct *tty = hu->tty;
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BT_DBG("hdev %p tty %p", hdev, tty);
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if (hu->tx_skb) {
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kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
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}
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/* Flush any pending characters in the driver and discipline. */
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tty_ldisc_flush(tty);
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tty_driver_flush_buffer(tty);
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percpu_down_read(&hu->proto_lock);
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if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
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hu->proto->flush(hu);
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percpu_up_read(&hu->proto_lock);
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return 0;
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}
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/* Initialize device */
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static int hci_uart_open(struct hci_dev *hdev)
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{
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BT_DBG("%s %p", hdev->name, hdev);
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/* Undo clearing this from hci_uart_close() */
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hdev->flush = hci_uart_flush;
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return 0;
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}
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/* Close device */
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static int hci_uart_close(struct hci_dev *hdev)
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{
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BT_DBG("hdev %p", hdev);
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hci_uart_flush(hdev);
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hdev->flush = NULL;
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return 0;
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}
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/* Send frames from HCI layer */
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static int hci_uart_send_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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BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb),
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skb->len);
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percpu_down_read(&hu->proto_lock);
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if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
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percpu_up_read(&hu->proto_lock);
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return -EUNATCH;
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}
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hu->proto->enqueue(hu, skb);
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percpu_up_read(&hu->proto_lock);
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hci_uart_tx_wakeup(hu);
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return 0;
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}
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/* Check the underlying device or tty has flow control support */
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bool hci_uart_has_flow_control(struct hci_uart *hu)
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{
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/* serdev nodes check if the needed operations are present */
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if (hu->serdev)
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return true;
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if (hu->tty->driver->ops->tiocmget && hu->tty->driver->ops->tiocmset)
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return true;
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return false;
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}
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/* Flow control or un-flow control the device */
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void hci_uart_set_flow_control(struct hci_uart *hu, bool enable)
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{
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struct tty_struct *tty = hu->tty;
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struct ktermios ktermios;
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int status;
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unsigned int set = 0;
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unsigned int clear = 0;
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if (hu->serdev) {
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serdev_device_set_flow_control(hu->serdev, !enable);
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serdev_device_set_rts(hu->serdev, !enable);
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return;
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}
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if (enable) {
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/* Disable hardware flow control */
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ktermios = tty->termios;
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ktermios.c_cflag &= ~CRTSCTS;
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tty_set_termios(tty, &ktermios);
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BT_DBG("Disabling hardware flow control: %s",
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(tty->termios.c_cflag & CRTSCTS) ? "failed" : "success");
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/* Clear RTS to prevent the device from sending */
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/* Most UARTs need OUT2 to enable interrupts */
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status = tty->driver->ops->tiocmget(tty);
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BT_DBG("Current tiocm 0x%x", status);
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set &= ~(TIOCM_OUT2 | TIOCM_RTS);
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clear = ~set;
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set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
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TIOCM_OUT2 | TIOCM_LOOP;
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clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
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TIOCM_OUT2 | TIOCM_LOOP;
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status = tty->driver->ops->tiocmset(tty, set, clear);
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BT_DBG("Clearing RTS: %s", status ? "failed" : "success");
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} else {
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/* Set RTS to allow the device to send again */
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status = tty->driver->ops->tiocmget(tty);
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BT_DBG("Current tiocm 0x%x", status);
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set |= (TIOCM_OUT2 | TIOCM_RTS);
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clear = ~set;
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set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
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TIOCM_OUT2 | TIOCM_LOOP;
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clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
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TIOCM_OUT2 | TIOCM_LOOP;
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status = tty->driver->ops->tiocmset(tty, set, clear);
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BT_DBG("Setting RTS: %s", status ? "failed" : "success");
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/* Re-enable hardware flow control */
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ktermios = tty->termios;
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ktermios.c_cflag |= CRTSCTS;
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tty_set_termios(tty, &ktermios);
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BT_DBG("Enabling hardware flow control: %s",
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!(tty->termios.c_cflag & CRTSCTS) ? "failed" : "success");
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}
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}
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void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed,
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unsigned int oper_speed)
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{
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hu->init_speed = init_speed;
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hu->oper_speed = oper_speed;
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}
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void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed)
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{
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struct tty_struct *tty = hu->tty;
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struct ktermios ktermios;
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ktermios = tty->termios;
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ktermios.c_cflag &= ~CBAUD;
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tty_termios_encode_baud_rate(&ktermios, speed, speed);
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/* tty_set_termios() return not checked as it is always 0 */
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tty_set_termios(tty, &ktermios);
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BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name,
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tty->termios.c_ispeed, tty->termios.c_ospeed);
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}
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static int hci_uart_setup(struct hci_dev *hdev)
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{
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struct hci_uart *hu = hci_get_drvdata(hdev);
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struct hci_rp_read_local_version *ver;
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struct sk_buff *skb;
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unsigned int speed;
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int err;
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|
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/* Init speed if any */
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if (hu->init_speed)
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speed = hu->init_speed;
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else if (hu->proto->init_speed)
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speed = hu->proto->init_speed;
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else
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speed = 0;
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|
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if (speed)
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hci_uart_set_baudrate(hu, speed);
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|
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/* Operational speed if any */
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if (hu->oper_speed)
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speed = hu->oper_speed;
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else if (hu->proto->oper_speed)
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speed = hu->proto->oper_speed;
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else
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speed = 0;
|
|
|
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if (hu->proto->set_baudrate && speed) {
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err = hu->proto->set_baudrate(hu, speed);
|
|
if (!err)
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hci_uart_set_baudrate(hu, speed);
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}
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|
|
|
if (hu->proto->setup)
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return hu->proto->setup(hu);
|
|
|
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if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
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return 0;
|
|
|
|
skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
|
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HCI_INIT_TIMEOUT);
|
|
if (IS_ERR(skb)) {
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|
BT_ERR("%s: Reading local version information failed (%ld)",
|
|
hdev->name, PTR_ERR(skb));
|
|
return 0;
|
|
}
|
|
|
|
if (skb->len != sizeof(*ver)) {
|
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BT_ERR("%s: Event length mismatch for version information",
|
|
hdev->name);
|
|
goto done;
|
|
}
|
|
|
|
ver = (struct hci_rp_read_local_version *)skb->data;
|
|
|
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switch (le16_to_cpu(ver->manufacturer)) {
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#ifdef CONFIG_BT_HCIUART_INTEL
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|
case 2:
|
|
hdev->set_bdaddr = btintel_set_bdaddr;
|
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btintel_check_bdaddr(hdev);
|
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break;
|
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#endif
|
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#ifdef CONFIG_BT_HCIUART_BCM
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|
case 15:
|
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hdev->set_bdaddr = btbcm_set_bdaddr;
|
|
btbcm_check_bdaddr(hdev);
|
|
break;
|
|
#endif
|
|
default:
|
|
break;
|
|
}
|
|
|
|
done:
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
/* ------ LDISC part ------ */
|
|
/* hci_uart_tty_open
|
|
*
|
|
* Called when line discipline changed to HCI_UART.
|
|
*
|
|
* Arguments:
|
|
* tty pointer to tty info structure
|
|
* Return Value:
|
|
* 0 if success, otherwise error code
|
|
*/
|
|
static int hci_uart_tty_open(struct tty_struct *tty)
|
|
{
|
|
struct hci_uart *hu;
|
|
|
|
BT_DBG("tty %p", tty);
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
/* Error if the tty has no write op instead of leaving an exploitable
|
|
* hole
|
|
*/
|
|
if (tty->ops->write == NULL)
|
|
return -EOPNOTSUPP;
|
|
|
|
hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
|
|
if (!hu) {
|
|
BT_ERR("Can't allocate control structure");
|
|
return -ENFILE;
|
|
}
|
|
if (percpu_init_rwsem(&hu->proto_lock)) {
|
|
BT_ERR("Can't allocate semaphore structure");
|
|
kfree(hu);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
tty->disc_data = hu;
|
|
hu->tty = tty;
|
|
tty->receive_room = 65536;
|
|
|
|
/* disable alignment support by default */
|
|
hu->alignment = 1;
|
|
hu->padding = 0;
|
|
|
|
INIT_WORK(&hu->init_ready, hci_uart_init_work);
|
|
INIT_WORK(&hu->write_work, hci_uart_write_work);
|
|
|
|
/* Flush any pending characters in the driver */
|
|
tty_driver_flush_buffer(tty);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* hci_uart_tty_close()
|
|
*
|
|
* Called when the line discipline is changed to something
|
|
* else, the tty is closed, or the tty detects a hangup.
|
|
*/
|
|
static void hci_uart_tty_close(struct tty_struct *tty)
|
|
{
|
|
struct hci_uart *hu = tty->disc_data;
|
|
struct hci_dev *hdev;
|
|
|
|
BT_DBG("tty %p", tty);
|
|
|
|
/* Detach from the tty */
|
|
tty->disc_data = NULL;
|
|
|
|
if (!hu)
|
|
return;
|
|
|
|
hdev = hu->hdev;
|
|
if (hdev)
|
|
hci_uart_close(hdev);
|
|
|
|
if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
|
|
percpu_down_write(&hu->proto_lock);
|
|
clear_bit(HCI_UART_PROTO_READY, &hu->flags);
|
|
percpu_up_write(&hu->proto_lock);
|
|
|
|
cancel_work_sync(&hu->init_ready);
|
|
cancel_work_sync(&hu->write_work);
|
|
|
|
if (hdev) {
|
|
if (test_bit(HCI_UART_REGISTERED, &hu->flags))
|
|
hci_unregister_dev(hdev);
|
|
hci_free_dev(hdev);
|
|
}
|
|
hu->proto->close(hu);
|
|
}
|
|
clear_bit(HCI_UART_PROTO_SET, &hu->flags);
|
|
|
|
percpu_free_rwsem(&hu->proto_lock);
|
|
|
|
kfree(hu);
|
|
}
|
|
|
|
/* hci_uart_tty_wakeup()
|
|
*
|
|
* Callback for transmit wakeup. Called when low level
|
|
* device driver can accept more send data.
|
|
*
|
|
* Arguments: tty pointer to associated tty instance data
|
|
* Return Value: None
|
|
*/
|
|
static void hci_uart_tty_wakeup(struct tty_struct *tty)
|
|
{
|
|
struct hci_uart *hu = tty->disc_data;
|
|
|
|
BT_DBG("");
|
|
|
|
if (!hu)
|
|
return;
|
|
|
|
clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
|
|
|
|
if (tty != hu->tty)
|
|
return;
|
|
|
|
if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
|
|
hci_uart_tx_wakeup(hu);
|
|
}
|
|
|
|
/* hci_uart_tty_receive()
|
|
*
|
|
* Called by tty low level driver when receive data is
|
|
* available.
|
|
*
|
|
* Arguments: tty pointer to tty isntance data
|
|
* data pointer to received data
|
|
* flags pointer to flags for data
|
|
* count count of received data in bytes
|
|
*
|
|
* Return Value: None
|
|
*/
|
|
static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
|
|
const u8 *flags, size_t count)
|
|
{
|
|
struct hci_uart *hu = tty->disc_data;
|
|
|
|
if (!hu || tty != hu->tty)
|
|
return;
|
|
|
|
percpu_down_read(&hu->proto_lock);
|
|
|
|
if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
|
|
percpu_up_read(&hu->proto_lock);
|
|
return;
|
|
}
|
|
|
|
/* It does not need a lock here as it is already protected by a mutex in
|
|
* tty caller
|
|
*/
|
|
hu->proto->recv(hu, data, count);
|
|
percpu_up_read(&hu->proto_lock);
|
|
|
|
if (hu->hdev)
|
|
hu->hdev->stat.byte_rx += count;
|
|
|
|
tty_unthrottle(tty);
|
|
}
|
|
|
|
static int hci_uart_register_dev(struct hci_uart *hu)
|
|
{
|
|
struct hci_dev *hdev;
|
|
int err;
|
|
|
|
BT_DBG("");
|
|
|
|
/* Initialize and register HCI device */
|
|
hdev = hci_alloc_dev();
|
|
if (!hdev) {
|
|
BT_ERR("Can't allocate HCI device");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
hu->hdev = hdev;
|
|
|
|
hdev->bus = HCI_UART;
|
|
hci_set_drvdata(hdev, hu);
|
|
|
|
/* Only when vendor specific setup callback is provided, consider
|
|
* the manufacturer information valid. This avoids filling in the
|
|
* value for Ericsson when nothing is specified.
|
|
*/
|
|
if (hu->proto->setup)
|
|
hdev->manufacturer = hu->proto->manufacturer;
|
|
|
|
hdev->open = hci_uart_open;
|
|
hdev->close = hci_uart_close;
|
|
hdev->flush = hci_uart_flush;
|
|
hdev->send = hci_uart_send_frame;
|
|
hdev->setup = hci_uart_setup;
|
|
SET_HCIDEV_DEV(hdev, hu->tty->dev);
|
|
|
|
if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
|
|
set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
|
|
|
|
if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
|
|
set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
|
|
|
|
if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
|
|
set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
|
|
|
|
if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
|
|
hdev->dev_type = HCI_AMP;
|
|
else
|
|
hdev->dev_type = HCI_PRIMARY;
|
|
|
|
/* Only call open() for the protocol after hdev is fully initialized as
|
|
* open() (or a timer/workqueue it starts) may attempt to reference it.
|
|
*/
|
|
err = hu->proto->open(hu);
|
|
if (err) {
|
|
hu->hdev = NULL;
|
|
hci_free_dev(hdev);
|
|
return err;
|
|
}
|
|
|
|
if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
|
|
return 0;
|
|
|
|
if (hci_register_dev(hdev) < 0) {
|
|
BT_ERR("Can't register HCI device");
|
|
hu->proto->close(hu);
|
|
hu->hdev = NULL;
|
|
hci_free_dev(hdev);
|
|
return -ENODEV;
|
|
}
|
|
|
|
set_bit(HCI_UART_REGISTERED, &hu->flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int hci_uart_set_proto(struct hci_uart *hu, int id)
|
|
{
|
|
const struct hci_uart_proto *p;
|
|
int err;
|
|
|
|
p = hci_uart_get_proto(id);
|
|
if (!p)
|
|
return -EPROTONOSUPPORT;
|
|
|
|
hu->proto = p;
|
|
|
|
err = hci_uart_register_dev(hu);
|
|
if (err) {
|
|
return err;
|
|
}
|
|
|
|
set_bit(HCI_UART_PROTO_READY, &hu->flags);
|
|
return 0;
|
|
}
|
|
|
|
static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
|
|
{
|
|
unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
|
|
BIT(HCI_UART_RESET_ON_INIT) |
|
|
BIT(HCI_UART_CREATE_AMP) |
|
|
BIT(HCI_UART_INIT_PENDING) |
|
|
BIT(HCI_UART_EXT_CONFIG) |
|
|
BIT(HCI_UART_VND_DETECT);
|
|
|
|
if (flags & ~valid_flags)
|
|
return -EINVAL;
|
|
|
|
hu->hdev_flags = flags;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* hci_uart_tty_ioctl()
|
|
*
|
|
* Process IOCTL system call for the tty device.
|
|
*
|
|
* Arguments:
|
|
*
|
|
* tty pointer to tty instance data
|
|
* cmd IOCTL command code
|
|
* arg argument for IOCTL call (cmd dependent)
|
|
*
|
|
* Return Value: Command dependent
|
|
*/
|
|
static int hci_uart_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct hci_uart *hu = tty->disc_data;
|
|
int err = 0;
|
|
|
|
BT_DBG("");
|
|
|
|
/* Verify the status of the device */
|
|
if (!hu)
|
|
return -EBADF;
|
|
|
|
switch (cmd) {
|
|
case HCIUARTSETPROTO:
|
|
if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
|
|
err = hci_uart_set_proto(hu, arg);
|
|
if (err)
|
|
clear_bit(HCI_UART_PROTO_SET, &hu->flags);
|
|
} else
|
|
err = -EBUSY;
|
|
break;
|
|
|
|
case HCIUARTGETPROTO:
|
|
if (test_bit(HCI_UART_PROTO_SET, &hu->flags) &&
|
|
test_bit(HCI_UART_PROTO_READY, &hu->flags))
|
|
err = hu->proto->id;
|
|
else
|
|
err = -EUNATCH;
|
|
break;
|
|
|
|
case HCIUARTGETDEVICE:
|
|
if (test_bit(HCI_UART_REGISTERED, &hu->flags))
|
|
err = hu->hdev->id;
|
|
else
|
|
err = -EUNATCH;
|
|
break;
|
|
|
|
case HCIUARTSETFLAGS:
|
|
if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
|
|
err = -EBUSY;
|
|
else
|
|
err = hci_uart_set_flags(hu, arg);
|
|
break;
|
|
|
|
case HCIUARTGETFLAGS:
|
|
err = hu->hdev_flags;
|
|
break;
|
|
|
|
default:
|
|
err = n_tty_ioctl_helper(tty, cmd, arg);
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* We don't provide read/write/poll interface for user space.
|
|
*/
|
|
static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
|
|
u8 *buf, size_t nr, void **cookie,
|
|
unsigned long offset)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
|
|
const u8 *data, size_t count)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static struct tty_ldisc_ops hci_uart_ldisc = {
|
|
.owner = THIS_MODULE,
|
|
.num = N_HCI,
|
|
.name = "n_hci",
|
|
.open = hci_uart_tty_open,
|
|
.close = hci_uart_tty_close,
|
|
.read = hci_uart_tty_read,
|
|
.write = hci_uart_tty_write,
|
|
.ioctl = hci_uart_tty_ioctl,
|
|
.compat_ioctl = hci_uart_tty_ioctl,
|
|
.receive_buf = hci_uart_tty_receive,
|
|
.write_wakeup = hci_uart_tty_wakeup,
|
|
};
|
|
|
|
static int __init hci_uart_init(void)
|
|
{
|
|
int err;
|
|
|
|
BT_INFO("HCI UART driver ver %s", VERSION);
|
|
|
|
/* Register the tty discipline */
|
|
err = tty_register_ldisc(&hci_uart_ldisc);
|
|
if (err) {
|
|
BT_ERR("HCI line discipline registration failed. (%d)", err);
|
|
return err;
|
|
}
|
|
|
|
#ifdef CONFIG_BT_HCIUART_H4
|
|
h4_init();
|
|
#endif
|
|
#ifdef CONFIG_BT_HCIUART_BCSP
|
|
bcsp_init();
|
|
#endif
|
|
#ifdef CONFIG_BT_HCIUART_LL
|
|
ll_init();
|
|
#endif
|
|
#ifdef CONFIG_BT_HCIUART_ATH3K
|
|
ath_init();
|
|
#endif
|
|
#ifdef CONFIG_BT_HCIUART_3WIRE
|
|
h5_init();
|
|
#endif
|
|
#ifdef CONFIG_BT_HCIUART_INTEL
|
|
intel_init();
|
|
#endif
|
|
#ifdef CONFIG_BT_HCIUART_BCM
|
|
bcm_init();
|
|
#endif
|
|
#ifdef CONFIG_BT_HCIUART_QCA
|
|
qca_init();
|
|
#endif
|
|
#ifdef CONFIG_BT_HCIUART_AG6XX
|
|
ag6xx_init();
|
|
#endif
|
|
#ifdef CONFIG_BT_HCIUART_MRVL
|
|
mrvl_init();
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit hci_uart_exit(void)
|
|
{
|
|
#ifdef CONFIG_BT_HCIUART_H4
|
|
h4_deinit();
|
|
#endif
|
|
#ifdef CONFIG_BT_HCIUART_BCSP
|
|
bcsp_deinit();
|
|
#endif
|
|
#ifdef CONFIG_BT_HCIUART_LL
|
|
ll_deinit();
|
|
#endif
|
|
#ifdef CONFIG_BT_HCIUART_ATH3K
|
|
ath_deinit();
|
|
#endif
|
|
#ifdef CONFIG_BT_HCIUART_3WIRE
|
|
h5_deinit();
|
|
#endif
|
|
#ifdef CONFIG_BT_HCIUART_INTEL
|
|
intel_deinit();
|
|
#endif
|
|
#ifdef CONFIG_BT_HCIUART_BCM
|
|
bcm_deinit();
|
|
#endif
|
|
#ifdef CONFIG_BT_HCIUART_QCA
|
|
qca_deinit();
|
|
#endif
|
|
#ifdef CONFIG_BT_HCIUART_AG6XX
|
|
ag6xx_deinit();
|
|
#endif
|
|
#ifdef CONFIG_BT_HCIUART_MRVL
|
|
mrvl_deinit();
|
|
#endif
|
|
|
|
tty_unregister_ldisc(&hci_uart_ldisc);
|
|
}
|
|
|
|
module_init(hci_uart_init);
|
|
module_exit(hci_uart_exit);
|
|
|
|
MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
|
|
MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
|
|
MODULE_VERSION(VERSION);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_LDISC(N_HCI);
|