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- /*
- *
- * Bluetooth HCI UART driver
- *
- * Copyright (C) 2000-2001 Qualcomm Incorporated
- * Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
- * Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org>
- *
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- */
- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <linux/types.h>
- #include <linux/fcntl.h>
- #include <linux/interrupt.h>
- #include <linux/ptrace.h>
- #include <linux/poll.h>
- #include <linux/slab.h>
- #include <linux/tty.h>
- #include <linux/errno.h>
- #include <linux/string.h>
- #include <linux/signal.h>
- #include <linux/ioctl.h>
- #include <linux/skbuff.h>
- #include <linux/version.h>
- #include <net/bluetooth/bluetooth.h>
- #include <net/bluetooth/hci_core.h>
- #include "hci_uart.h"
- #define NEW_TX_SCHED_POLICY
- #if WOBT_NOTIFY
- #include <linux/suspend.h>
- #endif
- #ifdef BTCOEX
- #include "rtk_coex.h"
- #endif
- #define VERSION "2.2.0c90be4.20211102-175223"
- #if HCI_VERSION_CODE > KERNEL_VERSION(3, 4, 0)
- #define GET_DRV_DATA(x) hci_get_drvdata(x)
- #else
- #define GET_DRV_DATA(x) (struct hci_uart *)(x->driver_data)
- #endif
- #define SEMWAIT_TIMEOUT 50
- #if WOBT_NOTIFY
- struct hci_rsp_read_local {
- __u8 status;
- __u8 hci_ver;
- __le16 hci_rev;
- __u8 lmp_ver;
- __le16 manufacturer;
- __le16 lmp_subver;
- } __packed;
- #endif
- #if HCI_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
- static int reset = 0;
- #endif
- static struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
- static int hci_uart_flush(struct hci_dev *hdev);
- int hci_uart_register_proto(struct hci_uart_proto *p)
- {
- if (p->id >= HCI_UART_MAX_PROTO)
- return -EINVAL;
- if (hup[p->id])
- return -EEXIST;
- hup[p->id] = p;
- return 0;
- }
- int hci_uart_unregister_proto(struct hci_uart_proto *p)
- {
- if (p->id >= HCI_UART_MAX_PROTO)
- return -EINVAL;
- if (!hup[p->id])
- return -EINVAL;
- hup[p->id] = NULL;
- return 0;
- }
- static struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
- {
- if (id >= HCI_UART_MAX_PROTO)
- return NULL;
- return hup[id];
- }
- static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
- {
- struct hci_dev *hdev = hu->hdev;
- /* Update HCI stat counters */
- switch (pkt_type) {
- case HCI_COMMAND_PKT:
- hdev->stat.cmd_tx++;
- break;
- case HCI_ACLDATA_PKT:
- hdev->stat.acl_tx++;
- break;
- case HCI_SCODATA_PKT:
- hdev->stat.sco_tx++;
- break;
- }
- }
- static inline void hci_proto_read_lock(struct hci_uart *hu)
- {
- #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 7, 0)
- percpu_down_read(&hu->proto_lock);
- #else
- down_read(&hu->proto_lock);
- #endif
- }
- static inline int hci_proto_read_trylock(struct hci_uart *hu)
- {
- #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 7, 0)
- return percpu_down_read_trylock(&hu->proto_lock);
- #else
- return down_read_trylock(&hu->proto_lock);
- #endif
- }
- static inline void hci_proto_read_unlock(struct hci_uart *hu)
- {
- #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 7, 0)
- percpu_up_read(&hu->proto_lock);
- #else
- up_read(&hu->proto_lock);
- #endif
- }
- static inline void hci_proto_write_lock(struct hci_uart *hu)
- {
- #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 7, 0)
- percpu_down_write(&hu->proto_lock);
- #else
- down_write(&hu->proto_lock);
- #endif
- }
- static inline void hci_proto_write_unlock(struct hci_uart *hu)
- {
- #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 7, 0)
- percpu_up_write(&hu->proto_lock);
- #else
- up_write(&hu->proto_lock);
- #endif
- }
- static inline int hci_proto_init_rwlock(struct hci_uart *hu)
- {
- #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 7, 0)
- return percpu_init_rwsem(&hu->proto_lock);
- #else
- init_rwsem(&hu->proto_lock);
- return 0;
- #endif
- }
- static inline void hci_proto_free_rwlock(struct hci_uart *hu)
- {
- #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 7, 0)
- percpu_free_rwsem(&hu->proto_lock);
- #endif
- }
- static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
- {
- struct sk_buff *skb = hu->tx_skb;
- if (!skb) {
- hci_proto_read_lock(hu);
- if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
- skb = hu->proto->dequeue(hu);
- hci_proto_read_unlock(hu);
- } else {
- hu->tx_skb = NULL;
- }
- return skb;
- }
- /* This may be called in an IRQ context */
- int hci_uart_tx_wakeup(struct hci_uart *hu)
- {
- /* If acquiring lock fails we assume the tty is being closed because
- * that is the only time the write lock is acquired. If, however,
- * at some point in the future the write lock is also acquired in
- * other situations, then this must be revisited.
- */
- if (!hci_proto_read_trylock(hu))
- return 0;
- /* proto_lock is locked */
- if (!test_bit(HCI_UART_PROTO_READY, &hu->flags))
- goto no_schedule;
- #ifdef NEW_TX_SCHED_POLICY
- set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
- if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state))
- goto no_schedule;
- #else
- if (in_interrupt() || in_atomic()) {
- if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
- set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
- goto no_schedule;
- }
- } else {
- /* NOTE: proto_lock can't be spin lock, because it may
- * schedule here. Schedule is not allowed while atomic
- */
- if (down_timeout(&hu->tx_sem,
- msecs_to_jiffies(SEMWAIT_TIMEOUT)) == -ETIME) {
- pr_warn("%s: Something went wrong with wait\n",
- __func__);
- goto no_schedule;
- }
- /* semaphore is locked */
- if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
- set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
- up(&hu->tx_sem);
- goto no_schedule;
- }
- up(&hu->tx_sem);
- }
- #endif
- BT_DBG("");
- schedule_work(&hu->write_work);
- no_schedule:
- hci_proto_read_unlock(hu);
- return 0;
- }
- static void hci_uart_write_work(struct work_struct *work)
- {
- struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
- struct tty_struct *tty = hu->tty;
- struct hci_dev *hdev = hu->hdev;
- struct sk_buff *skb;
- /* REVISIT: should we cope with bad skbs or ->write() returning
- * and error value ?
- */
- restart:
- clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
- while ((skb = hci_uart_dequeue(hu))) {
- int len;
- set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
- len = tty->ops->write(tty, skb->data, skb->len);
- hdev->stat.byte_tx += len;
- skb_pull(skb, len);
- if (skb->len) {
- hu->tx_skb = skb;
- break;
- }
- hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type);
- kfree_skb(skb);
- }
- #ifdef NEW_TX_SCHED_POLICY
- clear_bit(HCI_UART_SENDING, &hu->tx_state);
- if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
- goto restart;
- #else
- if (down_timeout(&hu->tx_sem, msecs_to_jiffies(SEMWAIT_TIMEOUT))) {
- pr_warn("%s: Something went wrong with wait\n", __func__);
- goto restart;
- }
- /* semaphore is locked */
- if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state)) {
- up(&hu->tx_sem);
- goto restart;
- }
- clear_bit(HCI_UART_SENDING, &hu->tx_state);
- up(&hu->tx_sem);
- #endif
- return;
- }
- /* ------- Interface to HCI layer ------ */
- /* Initialize device */
- static int hci_uart_open(struct hci_dev *hdev)
- {
- BT_DBG("%s %p", hdev->name, hdev);
- /* Undo clearing this from hci_uart_close() */
- hdev->flush = hci_uart_flush;
- #if HCI_VERSION_CODE < KERNEL_VERSION(4, 4, 0)
- set_bit(HCI_RUNNING, &hdev->flags);
- #endif
- #ifdef BTCOEX
- rtk_btcoex_open(hdev);
- #endif
- return 0;
- }
- /* static void hci_flush_sync(struct hci_dev *hdev)
- * {
- * #if HCI_VERSION_CODE >= KERNEL_VERSION(3, 10, 0)
- * u8 buf[2] = { 0, 0 };
- * struct sk_buff *skb;
- *
- * BT_INFO("hci flush sync");
- *
- * set_bit(HCI_INIT, &hdev->flags);
- * skb = __hci_cmd_sync(hdev, 0xfc19, 2, buf, msecs_to_jiffies(2000));
- * clear_bit(HCI_INIT, &hdev->flags);
- *
- * if (IS_ERR(skb)) {
- * BT_ERR("command 0xfc19 tx failed (%ld)\n", PTR_ERR(skb));
- * return;
- * }
- *
- * if (skb->len == 1)
- * BT_INFO("hci flush sync status %u", skb->data[0]);
- *
- * kfree_skb(skb);
- * #endif
- * }
- */
- static int __hci_uart_flush(struct hci_dev *hdev, u8 sync)
- {
- struct hci_uart *hu = GET_DRV_DATA(hdev); //(struct hci_uart *) hdev->driver_data;
- struct tty_struct *tty = hu->tty;
- BT_INFO("%s: hdev %p tty %p", __func__, hdev, tty);
- /* Make sure all HCI packets has been transmitted */
- /* if (sync && test_bit(HCI_RUNNING, &hdev->flags))
- * hci_flush_sync(hdev);
- */
- if (hu->tx_skb) {
- kfree_skb(hu->tx_skb);
- hu->tx_skb = NULL;
- }
- /* Flush any pending characters in the driver and discipline. */
- /* tty_ldisc_flush(tty);
- * tty_driver_flush_buffer(tty);
- */
- /* Don't flush the tty. Sometime, the hdev is closed abnormally.
- * There may be cmd complete event in rx buf or the sent ack in tx buf.
- * tty flush will result in hciX: command 0xXXXX tx timeout
- */
- tty_wait_until_sent(tty, msecs_to_jiffies(500));
- hci_proto_read_lock(hu);
- if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
- hu->proto->flush(hu);
- hci_proto_read_unlock(hu);
- return 0;
- }
- /* Reset device */
- static int hci_uart_flush(struct hci_dev *hdev)
- {
- return __hci_uart_flush(hdev, 1);
- }
- /* Close device */
- static int hci_uart_close(struct hci_dev *hdev)
- {
- BT_INFO("%s: hdev %p", __func__, hdev);
- /* When in kernel 4.4.0 and greater, the HCI_RUNNING bit is
- * cleared in hci_dev_do_close(). */
- #if HCI_VERSION_CODE < KERNEL_VERSION(4, 4, 0)
- if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
- return 0;
- #else
- if (test_bit(HCI_RUNNING, &hdev->flags))
- BT_ERR("HCI_RUNNING is not cleared before.");
- #endif
- if (test_bit(HCI_RUNNING, &hdev->flags))
- __hci_uart_flush(hdev, 0);
- else
- __hci_uart_flush(hdev, 1);
- hdev->flush = NULL;
- #ifdef BTCOEX
- rtk_btcoex_close();
- #endif
- return 0;
- }
- /* Send frames from HCI layer */
- #if HCI_VERSION_CODE < KERNEL_VERSION(3, 13, 0)
- int hci_uart_send_frame(struct sk_buff *skb)
- #else
- int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
- #endif
- {
- #if HCI_VERSION_CODE < KERNEL_VERSION(3, 13, 0)
- struct hci_dev *hdev = (struct hci_dev *)skb->dev;
- #endif
- struct hci_uart *hu;
- if (!hdev) {
- BT_ERR("Frame for unknown device (hdev=NULL)");
- return -ENODEV;
- }
- #if HCI_VERSION_CODE < KERNEL_VERSION(4, 4, 0)
- if (!test_bit(HCI_RUNNING, &hdev->flags))
- return -EBUSY;
- #endif
- hu = GET_DRV_DATA(hdev); //(struct hci_uart *) hdev->driver_data;
- BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type,
- skb->len);
- #ifdef BTCOEX
- if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT)
- rtk_btcoex_parse_cmd(skb->data, skb->len);
- if (bt_cb(skb)->pkt_type == HCI_ACLDATA_PKT)
- rtk_btcoex_parse_l2cap_data_tx(skb->data, skb->len);
- #endif
- hci_proto_read_lock(hu);
- if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
- hci_proto_read_unlock(hu);
- return -EUNATCH;
- }
- hu->proto->enqueue(hu, skb);
- hci_proto_read_unlock(hu);
- hci_uart_tx_wakeup(hu);
- return 0;
- }
- #if HCI_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
- static void hci_uart_destruct(struct hci_dev *hdev)
- {
- if (!hdev)
- return;
- BT_DBG("%s", hdev->name);
- kfree(hdev->driver_data);
- }
- #endif
- #if WOBT_NOTIFY
- static int hci_uart_async_send(struct hci_uart *hu, u16 opcode,
- u32 plen, const void *param)
- {
- int len = HCI_COMMAND_HDR_SIZE + plen;
- struct hci_command_hdr *hdr;
- struct sk_buff *skb;
- skb = bt_skb_alloc(len, GFP_ATOMIC);
- if (!skb)
- return -ENOMEM;
- hdr = (struct hci_command_hdr *)skb_put(skb, HCI_COMMAND_HDR_SIZE);
- hdr->opcode = cpu_to_le16(opcode);
- hdr->plen = plen;
- if (plen)
- memcpy(skb_put(skb, plen), param, plen);
- BT_INFO("rtl: skb len %d", skb->len);
- bt_cb(skb)->pkt_type = HCI_COMMAND_PKT;
- #if HCI_VERSION_CODE >= KERNEL_VERSION(3, 18, 0)
- #if HCI_VERSION_CODE < KERNEL_VERSION(4, 4, 0)
- bt_cb(skb)->opcode = opcode;
- #else
- bt_cb(skb)->hci.opcode = opcode;
- #endif
- #endif
- /* Stand-alone HCI commands must be flagged as
- * single-command requests.
- */
- #if HCI_VERSION_CODE >= KERNEL_VERSION(3, 10, 0)
- #if HCI_VERSION_CODE < KERNEL_VERSION(4, 4, 0)
- bt_cb(skb)->req.start = true;
- #else
- #if HCI_VERSION_CODE < KERNEL_VERSION(4, 5, 0)
- bt_cb(skb)->hci.req_start = true;
- #else
- bt_cb(skb)->hci.req_flags |= HCI_REQ_START;
- #endif
- #endif /* 4.4.0 */
- #endif /* 3.10.0 */
- #if HCI_VERSION_CODE < KERNEL_VERSION(3, 13, 0)
- hci_uart_send_frame(skb);
- #else
- hci_uart_send_frame(hu->hdev, skb);
- #endif
- /* hci_proto_read_lock(hu);
- * if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
- * hci_proto_read_unlock(hu);
- * BT_ERR("rtl send: proto not ready");
- * return -EUNATCH;
- * }
- * hu->proto->enqueue(hu, skb);
- * hci_proto_read_unlock(hu);
- * hci_uart_tx_wakeup(hu);
- */
- return 0;
- }
- static int rtl_read_local_version(struct hci_dev *hdev, u8 *hci_ver,
- u16 *hci_rev, u16 *lmp_subver)
- {
- struct hci_rsp_read_local *ver;
- struct sk_buff *skb;
- skb = __hci_cmd_sync(hdev, 0x1001, 0, NULL, HCI_INIT_TIMEOUT);
- if (IS_ERR(skb)) {
- BT_ERR("rtl: Could not read lmp subversion");
- return PTR_ERR(skb);
- }
- if (skb->len != sizeof(struct hci_rsp_read_local)) {
- BT_ERR("%s: rtl: Local version length mismatch", hdev->name);
- kfree_skb(skb);
- return -EIO;
- }
- ver = (struct hci_rsp_read_local *)skb->data;
- *hci_ver = ver->hci_ver;
- *hci_rev = le16_to_cpu(ver->hci_rev);
- *lmp_subver = le16_to_cpu(ver->lmp_subver);
- kfree_skb(skb);
- return 0;
- }
- #if RTKBT_TV_POWERON_WHITELIST
- static int rtkbt_lookup_le_device_poweron_whitelist(struct hci_uart *hu)
- {
- struct hci_conn_params *p;
- u8 *params;
- int result = 0;
- hci_dev_lock(hu->hdev);
- list_for_each_entry(p, &hu->hdev->le_conn_params, list) {
- #if 0 // for debug message
- BT_INFO("%s(): auto_connect = %d", __FUNCTION__, p->auto_connect);
- BT_INFO("%s(): addr_type = 0x%02x", __FUNCTION__, p->addr_type);
- BT_INFO("%s(): addr=%02x:%02x:%02x:%02x:%02x:%02x", __FUNCTION__,
- p->addr.b[5], p->addr.b[4], p->addr.b[3],
- p->addr.b[2], p->addr.b[1], p->addr.b[0]);
- #endif
- if ( p->auto_connect == HCI_AUTO_CONN_ALWAYS &&
- p->addr_type == ADDR_LE_DEV_PUBLIC ) {
- BT_INFO("%s(): Set RTKBT LE Power-on Whitelist for "
- "%02x:%02x:%02x:%02x:%02x:%02x", __FUNCTION__,
- p->addr.b[5], p->addr.b[4], p->addr.b[3],
- p->addr.b[2], p->addr.b[1], p->addr.b[0]);
- params = kzalloc(8, GFP_ATOMIC);
- if (!params) {
- BT_ERR("Can't allocate memory for params");
- return -ENOMEM;
- }
- params[0] = 0x00;
- params[1] = p->addr.b[0];
- params[2] = p->addr.b[1];
- params[3] = p->addr.b[2];
- params[4] = p->addr.b[3];
- params[5] = p->addr.b[4];
- params[6] = p->addr.b[5];
- result = hci_uart_async_send(hu, 0xfc7b, 7, params);
- if (result)
- BT_ERR("rtl: Command failed for power-on whitelist");
- msleep(500);
- kfree(params);
- }
- }
- hci_dev_unlock(hu->hdev);
- return result;
- }
- #endif
- static int rtkbt_notify_suspend(struct hci_uart *hu)
- {
- struct hci_conn *conn;
- struct sk_buff *rx_skb;
- u8 params_suspend_notify[1] = { 0x01 };
- u8 event_params[6] = { 0x05, 0x04, 0x00, 0x10, 0x00, 0x13 };
- int result = 0;
- result = hci_uart_async_send(hu, 0xfc28, 1, params_suspend_notify);
- if (result)
- BT_ERR("Realtek suspend h5-bt failed");
- msleep(500);
- hci_dev_lock(hu->hdev);
- conn = hci_conn_hash_lookup_state(hu->hdev, LE_LINK, BT_CONNECTED);
- if (conn && (conn->state == BT_CONNECTED)){
- rx_skb = alloc_skb(6, GFP_ATOMIC);
- if (!rx_skb)
- return -1;
- event_params[3] = (u8)(conn->handle);
- event_params[4] = (u8)(conn->handle >> 8);
- hci_skb_pkt_type(rx_skb) = HCI_EVENT_PKT;
- skb_put_data(rx_skb, event_params, 6);
- BT_INFO("Send Disconnect Complete EVENT to upper stack");
- hci_recv_frame(hu->hdev, rx_skb);
- }
- hci_dev_unlock(hu->hdev);
- return result;
- }
- static void le_scan_disable(struct hci_uart *hu)
- {
- #if HCI_VERSION_CODE >= KERNEL_VERSION(4, 19, 0)
- if (use_ext_scan(hu->hdev)) {
- u8 ext_enable_cp[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
- hci_uart_async_send(hu, HCI_OP_LE_SET_EXT_SCAN_ENABLE, 6, ext_enable_cp);
- } else {
- u8 enable_cp[2] = {0x00, 0x00};
- hci_uart_async_send(hu, HCI_OP_LE_SET_SCAN_ENABLE, 2, enable_cp);
- }
- #else
- u8 enable_cp[2] = {0x00, 0x00};
- hci_uart_async_send(hu, HCI_OP_LE_SET_SCAN_ENABLE, 2, enable_cp);
- #endif
- return;
- }
- static void le_scan_restart(struct hci_uart *hu)
- {
- int result;
- #if HCI_VERSION_CODE >= KERNEL_VERSION(4, 19, 0)
- if (use_ext_scan(hu->hdev)) {
- u8 ext_enable_cp[6] = { 0x01, 0x01, 0x00, 0x00, 0x00, 0x00};
- BT_INFO("LE Extended Scan Restart...");
- le_scan_disable(hu);
- result = hci_uart_async_send(hu, HCI_OP_LE_SET_EXT_SCAN_ENABLE, 6, ext_enable_cp);
- if (result)
- BT_ERR("LE Extended Scan Restart: Failed");
- } else {
- u8 enable_cp[2] = {0x01, 0x01};
- BT_INFO("LE Scan Restart...");
- le_scan_disable(hu);
- result = hci_uart_async_send(hu, HCI_OP_LE_SET_SCAN_ENABLE, 2, enable_cp);
- if (result)
- BT_ERR("LE Scan Restart: Failed");
- }
- #else
- u8 enable_cp[2] = {0x01, 0x01};
- BT_INFO("LE Scan Restart");
- le_scan_disable(hu);
- result = hci_uart_async_send(hu, HCI_OP_LE_SET_SCAN_ENABLE, 2, enable_cp);
- if (result)
- BT_ERR("LE Scan Restart: Failed");
- #endif
- return;
- }
- static bool le_aoto_conn_always_exist(struct hci_uart *hu)
- {
- struct hci_conn_params *p;
- bool ret = false;
- hci_dev_lock(hu->hdev);
- list_for_each_entry(p, &hu->hdev->le_conn_params, list) {
- if ( p->auto_connect == HCI_AUTO_CONN_ALWAYS &&
- p->addr_type == ADDR_LE_DEV_PUBLIC ) {
- ret = true;
- }
- }
- hci_dev_unlock(hu->hdev);
- return ret;
- }
- static int hci_uart_pm_notifier(struct notifier_block *b, unsigned long v, void *d)
- {
- int result;
- struct hci_uart *hu = container_of(b, struct hci_uart, pm_notify_block);
- u8 hci_ver = 0;
- u16 hci_rev = 0;
- u16 lmp_subver = 0;
- #if WOBT_NOTIFY_BG_SCAN_LE_WHITELIST_ONLY
- u8 params_bg_scan[5] = { 0x60, 0x01, 0x10, 0x00, 0x01 };
- #endif
- BT_INFO("%s: %lu", __func__, v);
- switch (v) {
- case PM_SUSPEND_PREPARE:
- BT_INFO("rtl: bt suspending");
- #if WOBT_NOTIFY_BG_SCAN_LE_WHITELIST_ONLY
- /* Send set back ground scan parameters to Controller for power-on mode */
- result = hci_uart_async_send(hu, 0xfc7a, 5, params_bg_scan);
- if (result)
- BT_ERR("Realtek bg-scan h5-bt failed");
- /* FIXME: Ensure the above vendor command is sent to Controller
- * and we received the h5 ack from Controller
- * */
- msleep(500);
- #endif
- #if RTKBT_TV_POWERON_WHITELIST
- result = rtkbt_lookup_le_device_poweron_whitelist(hu);
- if (result < 0) {
- BT_ERR("rtkbt_lookup_le_device_poweron_whitelist error: %d", result);
- }
- #endif
- result = rtkbt_notify_suspend(hu);
- if (result < 0) {
- BT_ERR("rtkbt_notify_suspend error: %d", result);
- }
- break;
- case PM_POST_SUSPEND:
- result = rtl_read_local_version(hu->hdev, &hci_ver, &hci_rev,
- &lmp_subver);
- if (result)
- break;
- BT_INFO("rtl resume: hci ver %u, hci rev %04x, lmp subver %04x",
- hci_ver, hci_rev, lmp_subver);
- if (le_aoto_conn_always_exist(hu))
- le_scan_restart(hu);
- break;
- default:
- BT_INFO("Caught msg %lu other than SUSPEND_PREPARE", v);
- break;
- }
- return 0;
- }
- #endif
- /* ------ 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 = (void *)tty->disc_data;
- BT_DBG("tty %p", tty);
- /* But nothing ensures disc_data to be NULL. And since ld->ops->open
- * shall be called only once, we do not need the check at all.
- * So remove it.
- *
- * Note that this is not an issue now, but n_tty will start using the
- * disc_data pointer and this invalid 'if' would trigger then rendering
- * TTYs over BT unusable.
- */
- #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 8, 0)
- /* FIXME: This btw is bogus, nothing requires the old ldisc to clear
- * the pointer
- */
- if (hu)
- return -EEXIST;
- #endif
- /* Error if the tty has no write op instead of leaving an exploitable
- * hole
- */
- if (tty->ops->write == NULL)
- return -EOPNOTSUPP;
- if (!(hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL))) {
- BT_ERR("Can't allocate control structure");
- return -ENFILE;
- }
- tty->disc_data = hu;
- hu->tty = tty;
- tty->receive_room = 65536;
- INIT_WORK(&hu->write_work, hci_uart_write_work);
- hci_proto_init_rwlock(hu);
- sema_init(&hu->tx_sem, 1);
- /* Flush any pending characters in the driver and line discipline. */
- /* FIXME: why is this needed. Note don't use ldisc_ref here as the
- open path is before the ldisc is referencable */
- if (tty->ldisc->ops->flush_buffer)
- tty->ldisc->ops->flush_buffer(tty);
- tty_driver_flush_buffer(tty);
- #if WOBT_NOTIFY
- hu->pm_notify_block.notifier_call = hci_uart_pm_notifier;
- register_pm_notifier(&hu->pm_notify_block);
- #endif
- 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 = (void *)tty->disc_data;
- struct hci_dev *hdev;
- BT_INFO("%s: tty %p", __func__, 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)) {
- hci_proto_write_lock(hu);
- clear_bit(HCI_UART_PROTO_READY, &hu->flags);
- hci_proto_write_unlock(hu);
- 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);
- hci_proto_free_rwlock(hu);
- #if WOBT_NOTIFY
- unregister_pm_notifier(&hu->pm_notify_block);
- #endif
- 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 = (void *)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,
- char *flags, int count)
- {
- struct hci_uart *hu = (void *)tty->disc_data;
- int (*proto_receive)(struct hci_uart *hu, void *data, int len);
- if (!hu || tty != hu->tty)
- return;
- hci_proto_read_lock(hu);
- if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
- hci_proto_read_unlock(hu);
- return;
- }
- proto_receive = hu->proto->recv;
- #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 0, 0)
- proto_receive(hu, (void *)data, count);
- hci_proto_read_unlock(hu);
- #else
- hci_proto_read_unlock(hu);
- /* It does not need a lock here as it is already protected by a mutex in
- * tty caller
- */
- proto_receive(hu, (void *)data, count);
- #endif
- 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;
- BT_INFO("hci_uart_register_dev");
- /* Initialize and register HCI device */
- hdev = hci_alloc_dev();
- if (!hdev) {
- BT_ERR("Can't allocate HCI device");
- return -ENOMEM;
- }
- hu->hdev = hdev;
- #if HCI_VERSION_CODE > KERNEL_VERSION(2, 6, 33)
- hdev->bus = HCI_UART;
- #else
- hdev->type = HCI_UART;
- #endif
- #if HCI_VERSION_CODE >= KERNEL_VERSION(3, 4, 0)
- hci_set_drvdata(hdev, hu);
- #else
- hdev->driver_data = hu;
- #endif
- hdev->open = hci_uart_open;
- hdev->close = hci_uart_close;
- hdev->flush = hci_uart_flush;
- hdev->send = hci_uart_send_frame;
- /* NOTE: No hdev->setup setting for Realtek BTUART because
- * the download procedure is done with rtk_hciattach in userspace
- * before this function called in hci_uart_set_proto()
- */
- SET_HCIDEV_DEV(hdev, hu->tty->dev);
- #if HCI_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
- hdev->destruct = hci_uart_destruct;
- hdev->owner = THIS_MODULE;
- #endif
- #if HCI_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
- if (!reset)
- set_bit(HCI_QUIRK_NO_RESET, &hdev->quirks);
- #endif
- #if HCI_VERSION_CODE >= KERNEL_VERSION(2, 6, 36)
- if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
- set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
- #endif
- #if HCI_VERSION_CODE >= KERNEL_VERSION(3, 17, 0)
- if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
- set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
- #endif
- #if HCI_VERSION_CODE >= KERNEL_VERSION(3, 4, 0)
- if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
- #if HCI_VERSION_CODE >= KERNEL_VERSION(3, 6, 0)
- set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
- #else
- set_bit(HCI_QUIRK_NO_RESET, &hdev->quirks);
- #endif
- #endif
- #if HCI_VERSION_CODE >= KERNEL_VERSION(3, 4, 0)
- if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
- hdev->dev_type = HCI_AMP;
- else
- #if HCI_VERSION_CODE < KERNEL_VERSION(4, 8, 0)
- hdev->dev_type = HCI_BREDR;
- #else
- hdev->dev_type = HCI_PRIMARY;
- #endif
- #endif
- #if HCI_VERSION_CODE >= KERNEL_VERSION(4, 1, 0)
- set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
- #endif
- if (hci_register_dev(hdev) < 0) {
- BT_ERR("Can't register HCI device");
- hci_free_dev(hdev);
- return -ENODEV;
- }
- set_bit(HCI_UART_REGISTERED, &hu->flags);
- #ifdef BTCOEX
- rtk_btcoex_probe(hdev);
- #endif
- return 0;
- }
- static int hci_uart_set_proto(struct hci_uart *hu, int id)
- {
- struct hci_uart_proto *p;
- int err;
- p = hci_uart_get_proto(id);
- if (!p)
- return -EPROTONOSUPPORT;
- err = p->open(hu);
- if (err)
- return err;
- hu->proto = p;
- set_bit(HCI_UART_PROTO_READY, &hu->flags);
- /* Initialize and register HCI dev */
- err = hci_uart_register_dev(hu);
- if (err) {
- clear_bit(HCI_UART_PROTO_READY, &hu->flags);
- p->close(hu);
- return err;
- }
- return 0;
- }
- #if HCI_VERSION_CODE >= KERNEL_VERSION(3, 17, 0)
- static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
- {
- /* TODO: Add HCI_UART_INIT_PENDING, HCI_UART_VND_DETECT check */
- unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
- BIT(HCI_UART_RESET_ON_INIT) |
- BIT(HCI_UART_CREATE_AMP) |
- BIT(HCI_UART_EXT_CONFIG);
- if (flags & ~valid_flags)
- return -EINVAL;
- hu->hdev_flags = flags;
- return 0;
- }
- #endif
- /* hci_uart_tty_ioctl()
- *
- * Process IOCTL system call for the tty device.
- *
- * Arguments:
- *
- * tty pointer to tty instance data
- * file pointer to open file object for device
- * 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, struct file *file,
- unsigned int cmd, unsigned long arg)
- {
- struct hci_uart *hu = (void *)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);
- return err;
- }
- } else
- return -EBUSY;
- break;
- case HCIUARTGETPROTO:
- if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
- return hu->proto->id;
- return -EUNATCH;
- case HCIUARTGETDEVICE:
- if (test_bit(HCI_UART_REGISTERED, &hu->flags))
- return hu->hdev->id;
- return -EUNATCH;
- case HCIUARTSETFLAGS:
- if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
- return -EBUSY;
- #if HCI_VERSION_CODE >= KERNEL_VERSION(3, 17, 0)
- err = hci_uart_set_flags(hu, arg);
- if (err)
- return err;
- #else
- hu->hdev_flags = arg;
- #endif
- break;
- case HCIUARTGETFLAGS:
- return hu->hdev_flags;
- default:
- err = n_tty_ioctl_helper(tty, file, cmd, arg);
- break;
- };
- return err;
- }
- /*
- * We don't provide read/write/poll interface for user space.
- */
- #if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 10, 20) && \
- ((LINUX_VERSION_CODE < KERNEL_VERSION(5, 11, 0)) || \
- (LINUX_VERSION_CODE >= KERNEL_VERSION(5, 11, 3)))
- static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
- unsigned char *buf, size_t nr,
- void **cookie, unsigned long offset)
- #else
- static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
- unsigned char __user * buf, size_t nr)
- #endif
- {
- return 0;
- }
- static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
- const unsigned char *data, size_t count)
- {
- return 0;
- }
- static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
- struct file *filp, poll_table * wait)
- {
- return 0;
- }
- static struct tty_ldisc_ops hci_uart_ldisc = {
- .owner = THIS_MODULE,
- .magic = TTY_LDISC_MAGIC,
- .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,
- #if HCI_VERSION_CODE >= KERNEL_VERSION(4, 20, 0)
- .compat_ioctl = hci_uart_tty_ioctl,
- #endif
- .poll = hci_uart_tty_poll,
- .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 */
- if ((err = tty_register_ldisc(N_HCI, &hci_uart_ldisc))) {
- BT_ERR("HCI line discipline registration failed. (%d)", err);
- return err;
- }
- #ifdef CONFIG_BT_HCIUART_H4
- h4_init();
- #endif
- /* Add realtek h5 support */
- h5_init();
- #ifdef BTCOEX
- rtk_btcoex_init();
- #endif
- return 0;
- }
- static void __exit hci_uart_exit(void)
- {
- int err;
- #ifdef CONFIG_BT_HCIUART_H4
- h4_deinit();
- #endif
- h5_deinit();
- /* Release tty registration of line discipline */
- if ((err = tty_unregister_ldisc(N_HCI)))
- BT_ERR("Can't unregister HCI line discipline (%d)", err);
- #ifdef BTCOEX
- rtk_btcoex_exit();
- #endif
- }
- module_init(hci_uart_init);
- module_exit(hci_uart_exit);
- #if HCI_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
- module_param(reset, bool, 0644);
- MODULE_PARM_DESC(reset, "Send HCI reset command on initialization");
- #endif
- 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);
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