Bluetooth: hci_uart: add serdev driver support library
This adds library functions for serdev based BT drivers. This is largely copied from hci_ldisc.c and modified to use serdev calls. There's a little bit of duplication, but I avoided intermixing this as the ldisc code should eventually go away. Signed-off-by: Rob Herring <robh@kernel.org> Cc: Marcel Holtmann <marcel@holtmann.org> Cc: Gustavo Padovan <gustavo@padovan.org> Cc: Johan Hedberg <johan.hedberg@gmail.com> Cc: linux-bluetooth@vger.kernel.org Acked-by: Pavel Machek <pavel@ucw.cz> [Fix style issues reported by Pavel] Signed-off-by: Sebastian Reichel <sre@kernel.org> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Rob Herring
Marcel Holtmann
parent
aeac301406
commit
82f5169bf3
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@ -29,6 +29,7 @@ btmrvl-y := btmrvl_main.o
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btmrvl-$(CONFIG_DEBUG_FS) += btmrvl_debugfs.o
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hci_uart-y := hci_ldisc.o
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hci_uart-$(CONFIG_SERIAL_DEV_BUS) += hci_serdev.o
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hci_uart-$(CONFIG_BT_HCIUART_H4) += hci_h4.o
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hci_uart-$(CONFIG_BT_HCIUART_BCSP) += hci_bcsp.o
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hci_uart-$(CONFIG_BT_HCIUART_LL) += hci_ll.o
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@ -0,0 +1,361 @@
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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 <robh@kernel.org>
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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 <maxk@qualcomm.com>
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* Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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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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struct serdev_device_ops hci_serdev_client_ops;
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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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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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} while(test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state));
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clear_bit(HCI_UART_SENDING, &hu->tx_state);
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}
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/* ------- Interface to HCI layer ------ */
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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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BT_DBG("%s %p", hdev->name, hdev);
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serdev_device_set_client_ops(hu->serdev, &hci_serdev_client_ops);
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return serdev_device_open(hu->serdev);
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}
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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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/* 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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hci_uart_flush(hdev);
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hdev->flush = NULL;
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serdev_device_close(hu->serdev);
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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_ERR("%s: failed to set baudrate", hdev->name);
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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_ERR("%s: Reading local version information failed (%ld)",
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hdev->name, 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_ERR("%s: Event length mismatch for version information",
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hdev->name);
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}
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kfree_skb(skb);
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return 0;
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}
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/** 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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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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err = p->open(hu);
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if (err)
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return err;
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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->write_work, hci_uart_write_work);
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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_RESET_ON_INIT, &hu->hdev_flags))
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set_bit(HCI_QUIRK_RESET_ON_CLOSE, &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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return err;
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}
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@ -58,6 +58,7 @@
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#define HCI_UART_VND_DETECT 5
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struct hci_uart;
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struct serdev_device;
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struct hci_uart_proto {
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unsigned int id;
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@ -77,6 +78,7 @@ struct hci_uart_proto {
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struct hci_uart {
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struct tty_struct *tty;
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struct serdev_device *serdev;
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struct hci_dev *hdev;
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unsigned long flags;
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unsigned long hdev_flags;
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@ -108,6 +110,8 @@ struct hci_uart {
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int hci_uart_register_proto(const struct hci_uart_proto *p);
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int hci_uart_unregister_proto(const struct hci_uart_proto *p);
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int hci_uart_register_device(struct hci_uart *hu, const struct hci_uart_proto *p);
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int hci_uart_tx_wakeup(struct hci_uart *hu);
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int hci_uart_init_ready(struct hci_uart *hu);
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void hci_uart_init_tty(struct hci_uart *hu);
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