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399 lines
8.8 KiB
399 lines
8.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Bluetooth HCI serdev driver lib |
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* |
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* Copyright (C) 2017 Linaro, Ltd., Rob Herring <[email protected]> |
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* |
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* Based on hci_ldisc.c: |
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* |
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* Copyright (C) 2000-2001 Qualcomm Incorporated |
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* Copyright (C) 2002-2003 Maxim Krasnyansky <[email protected]> |
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* Copyright (C) 2004-2005 Marcel Holtmann <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/types.h> |
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#include <linux/serdev.h> |
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#include <linux/skbuff.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 "hci_uart.h" |
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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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if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) |
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skb = hu->proto->dequeue(hu); |
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} else |
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hu->tx_skb = NULL; |
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return skb; |
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} |
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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 serdev_device *serdev = hu->serdev; |
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struct hci_dev *hdev = hu->hdev; |
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struct sk_buff *skb; |
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/* REVISIT: |
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* should we cope with bad skbs or ->write() returning an error value? |
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*/ |
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do { |
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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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len = serdev_device_write_buf(serdev, |
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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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} while (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state)); |
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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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BT_DBG("hdev %p serdev %p", hdev, hu->serdev); |
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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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serdev_device_write_flush(hu->serdev); |
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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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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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struct hci_uart *hu = hci_get_drvdata(hdev); |
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int err; |
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BT_DBG("%s %p", hdev->name, hdev); |
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/* When Quirk HCI_QUIRK_NON_PERSISTENT_SETUP is set by |
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* driver, BT SoC is completely turned OFF during |
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* BT OFF. Upon next BT ON UART port should be opened. |
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*/ |
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if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) { |
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err = serdev_device_open(hu->serdev); |
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if (err) |
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return err; |
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set_bit(HCI_UART_PROTO_READY, &hu->flags); |
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} |
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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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struct hci_uart *hu = hci_get_drvdata(hdev); |
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BT_DBG("hdev %p", hdev); |
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if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) |
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return 0; |
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hci_uart_flush(hdev); |
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hdev->flush = NULL; |
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/* When QUIRK HCI_QUIRK_NON_PERSISTENT_SETUP is set by driver, |
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* BT SOC is completely powered OFF during BT OFF, holding port |
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* open may drain the battery. |
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*/ |
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if (test_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks)) { |
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clear_bit(HCI_UART_PROTO_READY, &hu->flags); |
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serdev_device_close(hu->serdev); |
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} |
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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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hu->proto->enqueue(hu, skb); |
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hci_uart_tx_wakeup(hu); |
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return 0; |
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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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/* 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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if (speed) |
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serdev_device_set_baudrate(hu->serdev, speed); |
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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); |
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if (err) |
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bt_dev_err(hdev, "Failed to set baudrate"); |
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else |
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serdev_device_set_baudrate(hu->serdev, 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; |
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skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL, |
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HCI_INIT_TIMEOUT); |
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if (IS_ERR(skb)) { |
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bt_dev_err(hdev, "Reading local version info failed (%ld)", |
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PTR_ERR(skb)); |
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return 0; |
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} |
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if (skb->len != sizeof(*ver)) |
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bt_dev_err(hdev, "Event length mismatch for version info"); |
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kfree_skb(skb); |
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return 0; |
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} |
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/** hci_uart_write_wakeup - transmit buffer wakeup |
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* @serdev: serial device |
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* |
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* This function is called by the serdev framework when it accepts |
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* more data being sent. |
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*/ |
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static void hci_uart_write_wakeup(struct serdev_device *serdev) |
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{ |
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struct hci_uart *hu = serdev_device_get_drvdata(serdev); |
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BT_DBG(""); |
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if (!hu || serdev != hu->serdev) { |
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WARN_ON(1); |
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return; |
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} |
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if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) |
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hci_uart_tx_wakeup(hu); |
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} |
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/** hci_uart_receive_buf - receive buffer wakeup |
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* @serdev: serial device |
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* @data: pointer to received data |
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* @count: count of received data in bytes |
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* |
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* This function is called by the serdev framework when it received data |
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* in the RX buffer. |
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* |
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* Return: number of processed bytes |
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*/ |
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static int hci_uart_receive_buf(struct serdev_device *serdev, const u8 *data, |
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size_t count) |
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{ |
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struct hci_uart *hu = serdev_device_get_drvdata(serdev); |
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if (!hu || serdev != hu->serdev) { |
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WARN_ON(1); |
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return 0; |
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} |
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if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) |
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return 0; |
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/* It does not need a lock here as it is already protected by a mutex in |
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* tty caller |
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*/ |
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hu->proto->recv(hu, data, count); |
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if (hu->hdev) |
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hu->hdev->stat.byte_rx += count; |
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return count; |
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} |
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static const struct serdev_device_ops hci_serdev_client_ops = { |
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.receive_buf = hci_uart_receive_buf, |
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.write_wakeup = hci_uart_write_wakeup, |
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}; |
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int hci_uart_register_device(struct hci_uart *hu, |
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const struct hci_uart_proto *p) |
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{ |
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int err; |
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struct hci_dev *hdev; |
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BT_DBG(""); |
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serdev_device_set_client_ops(hu->serdev, &hci_serdev_client_ops); |
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err = serdev_device_open(hu->serdev); |
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if (err) |
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return err; |
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err = p->open(hu); |
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if (err) |
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goto err_open; |
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hu->proto = p; |
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set_bit(HCI_UART_PROTO_READY, &hu->flags); |
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/* Initialize and register HCI device */ |
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hdev = hci_alloc_dev(); |
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if (!hdev) { |
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BT_ERR("Can't allocate HCI device"); |
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err = -ENOMEM; |
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goto err_alloc; |
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} |
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hu->hdev = hdev; |
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hdev->bus = HCI_UART; |
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hci_set_drvdata(hdev, hu); |
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INIT_WORK(&hu->init_ready, hci_uart_init_work); |
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INIT_WORK(&hu->write_work, hci_uart_write_work); |
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percpu_init_rwsem(&hu->proto_lock); |
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/* Only when vendor specific setup callback is provided, consider |
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* the manufacturer information valid. This avoids filling in the |
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* value for Ericsson when nothing is specified. |
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*/ |
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if (hu->proto->setup) |
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hdev->manufacturer = hu->proto->manufacturer; |
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hdev->open = hci_uart_open; |
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hdev->close = hci_uart_close; |
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hdev->flush = hci_uart_flush; |
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hdev->send = hci_uart_send_frame; |
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hdev->setup = hci_uart_setup; |
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SET_HCIDEV_DEV(hdev, &hu->serdev->dev); |
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if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags)) |
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set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks); |
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if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags)) |
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set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks); |
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if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags)) |
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hdev->dev_type = HCI_AMP; |
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else |
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hdev->dev_type = HCI_PRIMARY; |
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if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) |
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return 0; |
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if (hci_register_dev(hdev) < 0) { |
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BT_ERR("Can't register HCI device"); |
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err = -ENODEV; |
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goto err_register; |
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} |
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set_bit(HCI_UART_REGISTERED, &hu->flags); |
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return 0; |
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err_register: |
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hci_free_dev(hdev); |
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err_alloc: |
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clear_bit(HCI_UART_PROTO_READY, &hu->flags); |
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p->close(hu); |
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err_open: |
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serdev_device_close(hu->serdev); |
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return err; |
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} |
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EXPORT_SYMBOL_GPL(hci_uart_register_device); |
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void hci_uart_unregister_device(struct hci_uart *hu) |
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{ |
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struct hci_dev *hdev = hu->hdev; |
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cancel_work_sync(&hu->init_ready); |
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if (test_bit(HCI_UART_REGISTERED, &hu->flags)) |
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hci_unregister_dev(hdev); |
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hci_free_dev(hdev); |
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cancel_work_sync(&hu->write_work); |
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hu->proto->close(hu); |
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if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) { |
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clear_bit(HCI_UART_PROTO_READY, &hu->flags); |
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serdev_device_close(hu->serdev); |
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} |
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} |
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EXPORT_SYMBOL_GPL(hci_uart_unregister_device);
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