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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#include <linux/kernel.h>#include <linux/types.h>#include <linux/serdev.h>#include <linux/skbuff.h>
#include <net/bluetooth/bluetooth.h>#include <net/bluetooth/hci_core.h>
#include "hci_uart.h"
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 struct sk_buff *hci_uart_dequeue(struct hci_uart *hu){ struct sk_buff *skb = hu->tx_skb;
if (!skb) { if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) skb = hu->proto->dequeue(hu); } else hu->tx_skb = NULL;
return skb;}
static void hci_uart_write_work(struct work_struct *work){ struct hci_uart *hu = container_of(work, struct hci_uart, write_work); struct serdev_device *serdev = hu->serdev; struct hci_dev *hdev = hu->hdev; struct sk_buff *skb;
/* REVISIT: * should we cope with bad skbs or ->write() returning an error value? */ do { clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
while ((skb = hci_uart_dequeue(hu))) { int len;
len = serdev_device_write_buf(serdev, 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, hci_skb_pkt_type(skb)); kfree_skb(skb); }
clear_bit(HCI_UART_SENDING, &hu->tx_state); } while (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state));}
/* ------- Interface to HCI layer ------ */
/* Reset device */static int hci_uart_flush(struct hci_dev *hdev){ struct hci_uart *hu = hci_get_drvdata(hdev);
BT_DBG("hdev %p serdev %p", hdev, hu->serdev);
if (hu->tx_skb) { kfree_skb(hu->tx_skb); hu->tx_skb = NULL; }
/* Flush any pending characters in the driver and discipline. */ serdev_device_write_flush(hu->serdev);
if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) hu->proto->flush(hu);
return 0;}
/* Initialize device */static int hci_uart_open(struct hci_dev *hdev){ struct hci_uart *hu = hci_get_drvdata(hdev); int err;
BT_DBG("%s %p", hdev->name, hdev);
/* When Quirk HCI_QUIRK_NON_PERSISTENT_SETUP is set by * driver, BT SoC is completely turned OFF during * BT OFF. Upon next BT ON UART port should be opened. */ if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) { err = serdev_device_open(hu->serdev); if (err) return err; set_bit(HCI_UART_PROTO_READY, &hu->flags); }
/* Undo clearing this from hci_uart_close() */ hdev->flush = hci_uart_flush;
return 0;}
/* Close device */static int hci_uart_close(struct hci_dev *hdev){ struct hci_uart *hu = hci_get_drvdata(hdev);
BT_DBG("hdev %p", hdev);
if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) return 0;
hci_uart_flush(hdev); hdev->flush = NULL;
/* When QUIRK HCI_QUIRK_NON_PERSISTENT_SETUP is set by driver, * BT SOC is completely powered OFF during BT OFF, holding port * open may drain the battery. */ if (hci_test_quirk(hdev, HCI_QUIRK_NON_PERSISTENT_SETUP)) { clear_bit(HCI_UART_PROTO_READY, &hu->flags); serdev_device_close(hu->serdev); }
return 0;}
/* Send frames from HCI layer */static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb){ struct hci_uart *hu = hci_get_drvdata(hdev);
BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb), skb->len);
hu->proto->enqueue(hu, skb);
hci_uart_tx_wakeup(hu);
return 0;}
static int hci_uart_setup(struct hci_dev *hdev){ struct hci_uart *hu = hci_get_drvdata(hdev); struct hci_rp_read_local_version *ver; struct sk_buff *skb; unsigned int speed; int err;
/* Init speed if any */ if (hu->init_speed) speed = hu->init_speed; else if (hu->proto->init_speed) speed = hu->proto->init_speed; else speed = 0;
if (speed) serdev_device_set_baudrate(hu->serdev, speed);
/* Operational speed if any */ if (hu->oper_speed) speed = hu->oper_speed; else if (hu->proto->oper_speed) speed = hu->proto->oper_speed; else speed = 0;
if (hu->proto->set_baudrate && speed) { err = hu->proto->set_baudrate(hu, speed); if (err) bt_dev_err(hdev, "Failed to set baudrate"); else serdev_device_set_baudrate(hu->serdev, speed); }
if (hu->proto->setup) return hu->proto->setup(hu);
if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags)) return 0;
skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL, HCI_INIT_TIMEOUT); if (IS_ERR(skb)) { bt_dev_err(hdev, "Reading local version info failed (%ld)", PTR_ERR(skb)); return 0; }
if (skb->len != sizeof(*ver)) bt_dev_err(hdev, "Event length mismatch for version info");
kfree_skb(skb); return 0;}
/* Check if the device is wakeable */static bool hci_uart_wakeup(struct hci_dev *hdev){ /* HCI UART devices are assumed to be wakeable by default. * Implement wakeup callback to override this behavior. */ return true;}
/** hci_uart_write_wakeup - transmit buffer wakeup * @serdev: serial device * * This function is called by the serdev framework when it accepts * more data being sent. */static void hci_uart_write_wakeup(struct serdev_device *serdev){ struct hci_uart *hu = serdev_device_get_drvdata(serdev);
BT_DBG("");
if (!hu || serdev != hu->serdev) { WARN_ON(1); return; }
if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) hci_uart_tx_wakeup(hu);}
/** hci_uart_receive_buf - receive buffer wakeup * @serdev: serial device * @data: pointer to received data * @count: count of received data in bytes * * This function is called by the serdev framework when it received data * in the RX buffer. * * Return: number of processed bytes */static size_t hci_uart_receive_buf(struct serdev_device *serdev, const u8 *data, size_t count){ struct hci_uart *hu = serdev_device_get_drvdata(serdev);
if (!hu || serdev != hu->serdev) { WARN_ON(1); return 0; }
if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) return 0;
/* It does not need a lock here as it is already protected by a mutex in * tty caller */ hu->proto->recv(hu, data, count);
if (hu->hdev) hu->hdev->stat.byte_rx += count;
return count;}
static const struct serdev_device_ops hci_serdev_client_ops = { .receive_buf = hci_uart_receive_buf, .write_wakeup = hci_uart_write_wakeup,};
int hci_uart_register_device_priv(struct hci_uart *hu, const struct hci_uart_proto *p, int sizeof_priv){ int err; struct hci_dev *hdev;
BT_DBG("");
serdev_device_set_client_ops(hu->serdev, &hci_serdev_client_ops);
if (percpu_init_rwsem(&hu->proto_lock)) return -ENOMEM;
err = serdev_device_open(hu->serdev); if (err) goto err_rwsem;
err = p->open(hu); if (err) goto err_open;
hu->proto = p; set_bit(HCI_UART_PROTO_READY, &hu->flags);
/* Initialize and register HCI device */ hdev = hci_alloc_dev_priv(sizeof_priv); if (!hdev) { BT_ERR("Can't allocate HCI device"); err = -ENOMEM; goto err_alloc; }
hu->hdev = hdev;
hdev->bus = HCI_UART; hci_set_drvdata(hdev, hu);
INIT_WORK(&hu->init_ready, hci_uart_init_work); INIT_WORK(&hu->write_work, hci_uart_write_work);
/* 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; if (!hdev->wakeup) hdev->wakeup = hci_uart_wakeup; SET_HCIDEV_DEV(hdev, &hu->serdev->dev);
if (test_bit(HCI_UART_NO_SUSPEND_NOTIFIER, &hu->flags)) hci_set_quirk(hdev, HCI_QUIRK_NO_SUSPEND_NOTIFIER);
if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags)) hci_set_quirk(hdev, HCI_QUIRK_RAW_DEVICE);
if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags)) hci_set_quirk(hdev, HCI_QUIRK_EXTERNAL_CONFIG);
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"); err = -ENODEV; goto err_register; }
set_bit(HCI_UART_REGISTERED, &hu->flags);
return 0;
err_register: hci_free_dev(hdev);err_alloc: clear_bit(HCI_UART_PROTO_READY, &hu->flags); p->close(hu);err_open: serdev_device_close(hu->serdev);err_rwsem: percpu_free_rwsem(&hu->proto_lock); return err;}EXPORT_SYMBOL_GPL(hci_uart_register_device_priv);
void hci_uart_unregister_device(struct hci_uart *hu){ struct hci_dev *hdev = hu->hdev;
cancel_work_sync(&hu->init_ready); if (test_bit(HCI_UART_REGISTERED, &hu->flags)) hci_unregister_dev(hdev); hci_free_dev(hdev);
cancel_work_sync(&hu->write_work);
hu->proto->close(hu);
if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) { clear_bit(HCI_UART_PROTO_READY, &hu->flags); serdev_device_close(hu->serdev); } percpu_free_rwsem(&hu->proto_lock);}EXPORT_SYMBOL_GPL(hci_uart_unregister_device);