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1059 lines
23 KiB
1059 lines
23 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* |
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* Bluetooth HCI Three-wire UART driver |
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* |
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* Copyright (C) 2012 Intel Corporation |
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*/ |
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|
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#include <linux/acpi.h> |
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#include <linux/errno.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/kernel.h> |
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#include <linux/mod_devicetable.h> |
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#include <linux/of_device.h> |
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#include <linux/serdev.h> |
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#include <linux/skbuff.h> |
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|
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#include <net/bluetooth/bluetooth.h> |
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#include <net/bluetooth/hci_core.h> |
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#include "btrtl.h" |
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#include "hci_uart.h" |
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#define HCI_3WIRE_ACK_PKT 0 |
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#define HCI_3WIRE_LINK_PKT 15 |
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|
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/* Sliding window size */ |
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#define H5_TX_WIN_MAX 4 |
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#define H5_ACK_TIMEOUT msecs_to_jiffies(250) |
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#define H5_SYNC_TIMEOUT msecs_to_jiffies(100) |
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|
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/* |
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* Maximum Three-wire packet: |
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* 4 byte header + max value for 12-bit length + 2 bytes for CRC |
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*/ |
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#define H5_MAX_LEN (4 + 0xfff + 2) |
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|
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/* Convenience macros for reading Three-wire header values */ |
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#define H5_HDR_SEQ(hdr) ((hdr)[0] & 0x07) |
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#define H5_HDR_ACK(hdr) (((hdr)[0] >> 3) & 0x07) |
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#define H5_HDR_CRC(hdr) (((hdr)[0] >> 6) & 0x01) |
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#define H5_HDR_RELIABLE(hdr) (((hdr)[0] >> 7) & 0x01) |
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#define H5_HDR_PKT_TYPE(hdr) ((hdr)[1] & 0x0f) |
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#define H5_HDR_LEN(hdr) ((((hdr)[1] >> 4) & 0x0f) + ((hdr)[2] << 4)) |
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#define SLIP_DELIMITER 0xc0 |
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#define SLIP_ESC 0xdb |
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#define SLIP_ESC_DELIM 0xdc |
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#define SLIP_ESC_ESC 0xdd |
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|
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/* H5 state flags */ |
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enum { |
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H5_RX_ESC, /* SLIP escape mode */ |
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H5_TX_ACK_REQ, /* Pending ack to send */ |
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}; |
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struct h5 { |
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/* Must be the first member, hci_serdev.c expects this. */ |
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struct hci_uart serdev_hu; |
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struct sk_buff_head unack; /* Unack'ed packets queue */ |
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struct sk_buff_head rel; /* Reliable packets queue */ |
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struct sk_buff_head unrel; /* Unreliable packets queue */ |
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unsigned long flags; |
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struct sk_buff *rx_skb; /* Receive buffer */ |
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size_t rx_pending; /* Expecting more bytes */ |
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u8 rx_ack; /* Last ack number received */ |
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int (*rx_func)(struct hci_uart *hu, u8 c); |
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struct timer_list timer; /* Retransmission timer */ |
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struct hci_uart *hu; /* Parent HCI UART */ |
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u8 tx_seq; /* Next seq number to send */ |
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u8 tx_ack; /* Next ack number to send */ |
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u8 tx_win; /* Sliding window size */ |
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enum { |
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H5_UNINITIALIZED, |
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H5_INITIALIZED, |
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H5_ACTIVE, |
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} state; |
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enum { |
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H5_AWAKE, |
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H5_SLEEPING, |
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H5_WAKING_UP, |
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} sleep; |
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const struct h5_vnd *vnd; |
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const char *id; |
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struct gpio_desc *enable_gpio; |
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struct gpio_desc *device_wake_gpio; |
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}; |
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struct h5_vnd { |
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int (*setup)(struct h5 *h5); |
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void (*open)(struct h5 *h5); |
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void (*close)(struct h5 *h5); |
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int (*suspend)(struct h5 *h5); |
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int (*resume)(struct h5 *h5); |
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const struct acpi_gpio_mapping *acpi_gpio_map; |
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}; |
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static void h5_reset_rx(struct h5 *h5); |
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static void h5_link_control(struct hci_uart *hu, const void *data, size_t len) |
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{ |
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struct h5 *h5 = hu->priv; |
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struct sk_buff *nskb; |
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nskb = alloc_skb(3, GFP_ATOMIC); |
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if (!nskb) |
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return; |
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hci_skb_pkt_type(nskb) = HCI_3WIRE_LINK_PKT; |
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skb_put_data(nskb, data, len); |
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skb_queue_tail(&h5->unrel, nskb); |
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} |
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static u8 h5_cfg_field(struct h5 *h5) |
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{ |
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/* Sliding window size (first 3 bits) */ |
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return h5->tx_win & 0x07; |
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} |
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static void h5_timed_event(struct timer_list *t) |
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{ |
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const unsigned char sync_req[] = { 0x01, 0x7e }; |
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unsigned char conf_req[3] = { 0x03, 0xfc }; |
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struct h5 *h5 = from_timer(h5, t, timer); |
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struct hci_uart *hu = h5->hu; |
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struct sk_buff *skb; |
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unsigned long flags; |
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BT_DBG("%s", hu->hdev->name); |
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if (h5->state == H5_UNINITIALIZED) |
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h5_link_control(hu, sync_req, sizeof(sync_req)); |
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if (h5->state == H5_INITIALIZED) { |
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conf_req[2] = h5_cfg_field(h5); |
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h5_link_control(hu, conf_req, sizeof(conf_req)); |
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} |
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if (h5->state != H5_ACTIVE) { |
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mod_timer(&h5->timer, jiffies + H5_SYNC_TIMEOUT); |
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goto wakeup; |
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} |
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if (h5->sleep != H5_AWAKE) { |
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h5->sleep = H5_SLEEPING; |
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goto wakeup; |
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} |
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BT_DBG("hu %p retransmitting %u pkts", hu, h5->unack.qlen); |
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spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING); |
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while ((skb = __skb_dequeue_tail(&h5->unack)) != NULL) { |
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h5->tx_seq = (h5->tx_seq - 1) & 0x07; |
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skb_queue_head(&h5->rel, skb); |
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} |
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spin_unlock_irqrestore(&h5->unack.lock, flags); |
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wakeup: |
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hci_uart_tx_wakeup(hu); |
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} |
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static void h5_peer_reset(struct hci_uart *hu) |
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{ |
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struct h5 *h5 = hu->priv; |
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bt_dev_err(hu->hdev, "Peer device has reset"); |
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h5->state = H5_UNINITIALIZED; |
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del_timer(&h5->timer); |
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skb_queue_purge(&h5->rel); |
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skb_queue_purge(&h5->unrel); |
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skb_queue_purge(&h5->unack); |
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h5->tx_seq = 0; |
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h5->tx_ack = 0; |
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/* Send reset request to upper stack */ |
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hci_reset_dev(hu->hdev); |
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} |
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static int h5_open(struct hci_uart *hu) |
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{ |
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struct h5 *h5; |
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const unsigned char sync[] = { 0x01, 0x7e }; |
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BT_DBG("hu %p", hu); |
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if (hu->serdev) { |
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h5 = serdev_device_get_drvdata(hu->serdev); |
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} else { |
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h5 = kzalloc(sizeof(*h5), GFP_KERNEL); |
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if (!h5) |
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return -ENOMEM; |
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} |
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hu->priv = h5; |
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h5->hu = hu; |
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skb_queue_head_init(&h5->unack); |
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skb_queue_head_init(&h5->rel); |
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skb_queue_head_init(&h5->unrel); |
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h5_reset_rx(h5); |
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timer_setup(&h5->timer, h5_timed_event, 0); |
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h5->tx_win = H5_TX_WIN_MAX; |
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if (h5->vnd && h5->vnd->open) |
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h5->vnd->open(h5); |
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set_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags); |
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/* Send initial sync request */ |
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h5_link_control(hu, sync, sizeof(sync)); |
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mod_timer(&h5->timer, jiffies + H5_SYNC_TIMEOUT); |
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return 0; |
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} |
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static int h5_close(struct hci_uart *hu) |
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{ |
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struct h5 *h5 = hu->priv; |
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del_timer_sync(&h5->timer); |
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skb_queue_purge(&h5->unack); |
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skb_queue_purge(&h5->rel); |
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skb_queue_purge(&h5->unrel); |
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kfree_skb(h5->rx_skb); |
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h5->rx_skb = NULL; |
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if (h5->vnd && h5->vnd->close) |
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h5->vnd->close(h5); |
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if (!hu->serdev) |
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kfree(h5); |
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return 0; |
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} |
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static int h5_setup(struct hci_uart *hu) |
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{ |
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struct h5 *h5 = hu->priv; |
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if (h5->vnd && h5->vnd->setup) |
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return h5->vnd->setup(h5); |
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return 0; |
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} |
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static void h5_pkt_cull(struct h5 *h5) |
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{ |
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struct sk_buff *skb, *tmp; |
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unsigned long flags; |
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int i, to_remove; |
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u8 seq; |
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spin_lock_irqsave(&h5->unack.lock, flags); |
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to_remove = skb_queue_len(&h5->unack); |
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if (to_remove == 0) |
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goto unlock; |
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seq = h5->tx_seq; |
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while (to_remove > 0) { |
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if (h5->rx_ack == seq) |
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break; |
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to_remove--; |
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seq = (seq - 1) & 0x07; |
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} |
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if (seq != h5->rx_ack) |
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BT_ERR("Controller acked invalid packet"); |
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i = 0; |
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skb_queue_walk_safe(&h5->unack, skb, tmp) { |
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if (i++ >= to_remove) |
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break; |
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__skb_unlink(skb, &h5->unack); |
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kfree_skb(skb); |
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} |
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if (skb_queue_empty(&h5->unack)) |
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del_timer(&h5->timer); |
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unlock: |
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spin_unlock_irqrestore(&h5->unack.lock, flags); |
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} |
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static void h5_handle_internal_rx(struct hci_uart *hu) |
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{ |
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struct h5 *h5 = hu->priv; |
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const unsigned char sync_req[] = { 0x01, 0x7e }; |
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const unsigned char sync_rsp[] = { 0x02, 0x7d }; |
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unsigned char conf_req[3] = { 0x03, 0xfc }; |
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const unsigned char conf_rsp[] = { 0x04, 0x7b }; |
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const unsigned char wakeup_req[] = { 0x05, 0xfa }; |
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const unsigned char woken_req[] = { 0x06, 0xf9 }; |
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const unsigned char sleep_req[] = { 0x07, 0x78 }; |
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const unsigned char *hdr = h5->rx_skb->data; |
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const unsigned char *data = &h5->rx_skb->data[4]; |
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BT_DBG("%s", hu->hdev->name); |
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if (H5_HDR_PKT_TYPE(hdr) != HCI_3WIRE_LINK_PKT) |
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return; |
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if (H5_HDR_LEN(hdr) < 2) |
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return; |
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conf_req[2] = h5_cfg_field(h5); |
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if (memcmp(data, sync_req, 2) == 0) { |
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if (h5->state == H5_ACTIVE) |
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h5_peer_reset(hu); |
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h5_link_control(hu, sync_rsp, 2); |
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} else if (memcmp(data, sync_rsp, 2) == 0) { |
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if (h5->state == H5_ACTIVE) |
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h5_peer_reset(hu); |
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h5->state = H5_INITIALIZED; |
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h5_link_control(hu, conf_req, 3); |
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} else if (memcmp(data, conf_req, 2) == 0) { |
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h5_link_control(hu, conf_rsp, 2); |
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if (h5->state != H5_ACTIVE) |
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h5_link_control(hu, conf_req, 3); |
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} else if (memcmp(data, conf_rsp, 2) == 0) { |
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if (H5_HDR_LEN(hdr) > 2) |
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h5->tx_win = (data[2] & 0x07); |
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BT_DBG("Three-wire init complete. tx_win %u", h5->tx_win); |
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h5->state = H5_ACTIVE; |
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hci_uart_init_ready(hu); |
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return; |
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} else if (memcmp(data, sleep_req, 2) == 0) { |
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BT_DBG("Peer went to sleep"); |
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h5->sleep = H5_SLEEPING; |
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return; |
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} else if (memcmp(data, woken_req, 2) == 0) { |
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BT_DBG("Peer woke up"); |
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h5->sleep = H5_AWAKE; |
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} else if (memcmp(data, wakeup_req, 2) == 0) { |
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BT_DBG("Peer requested wakeup"); |
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h5_link_control(hu, woken_req, 2); |
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h5->sleep = H5_AWAKE; |
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} else { |
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BT_DBG("Link Control: 0x%02hhx 0x%02hhx", data[0], data[1]); |
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return; |
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} |
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hci_uart_tx_wakeup(hu); |
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} |
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static void h5_complete_rx_pkt(struct hci_uart *hu) |
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{ |
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struct h5 *h5 = hu->priv; |
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const unsigned char *hdr = h5->rx_skb->data; |
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if (H5_HDR_RELIABLE(hdr)) { |
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h5->tx_ack = (h5->tx_ack + 1) % 8; |
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set_bit(H5_TX_ACK_REQ, &h5->flags); |
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hci_uart_tx_wakeup(hu); |
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} |
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h5->rx_ack = H5_HDR_ACK(hdr); |
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h5_pkt_cull(h5); |
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switch (H5_HDR_PKT_TYPE(hdr)) { |
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case HCI_EVENT_PKT: |
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case HCI_ACLDATA_PKT: |
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case HCI_SCODATA_PKT: |
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case HCI_ISODATA_PKT: |
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hci_skb_pkt_type(h5->rx_skb) = H5_HDR_PKT_TYPE(hdr); |
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/* Remove Three-wire header */ |
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skb_pull(h5->rx_skb, 4); |
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hci_recv_frame(hu->hdev, h5->rx_skb); |
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h5->rx_skb = NULL; |
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break; |
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default: |
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h5_handle_internal_rx(hu); |
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break; |
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} |
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h5_reset_rx(h5); |
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} |
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static int h5_rx_crc(struct hci_uart *hu, unsigned char c) |
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{ |
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h5_complete_rx_pkt(hu); |
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return 0; |
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} |
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static int h5_rx_payload(struct hci_uart *hu, unsigned char c) |
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{ |
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struct h5 *h5 = hu->priv; |
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const unsigned char *hdr = h5->rx_skb->data; |
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if (H5_HDR_CRC(hdr)) { |
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h5->rx_func = h5_rx_crc; |
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h5->rx_pending = 2; |
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} else { |
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h5_complete_rx_pkt(hu); |
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} |
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return 0; |
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} |
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static int h5_rx_3wire_hdr(struct hci_uart *hu, unsigned char c) |
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{ |
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struct h5 *h5 = hu->priv; |
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const unsigned char *hdr = h5->rx_skb->data; |
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BT_DBG("%s rx: seq %u ack %u crc %u rel %u type %u len %u", |
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hu->hdev->name, H5_HDR_SEQ(hdr), H5_HDR_ACK(hdr), |
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H5_HDR_CRC(hdr), H5_HDR_RELIABLE(hdr), H5_HDR_PKT_TYPE(hdr), |
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H5_HDR_LEN(hdr)); |
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if (((hdr[0] + hdr[1] + hdr[2] + hdr[3]) & 0xff) != 0xff) { |
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bt_dev_err(hu->hdev, "Invalid header checksum"); |
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h5_reset_rx(h5); |
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return 0; |
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} |
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if (H5_HDR_RELIABLE(hdr) && H5_HDR_SEQ(hdr) != h5->tx_ack) { |
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bt_dev_err(hu->hdev, "Out-of-order packet arrived (%u != %u)", |
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H5_HDR_SEQ(hdr), h5->tx_ack); |
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h5_reset_rx(h5); |
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return 0; |
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} |
|
|
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if (h5->state != H5_ACTIVE && |
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H5_HDR_PKT_TYPE(hdr) != HCI_3WIRE_LINK_PKT) { |
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bt_dev_err(hu->hdev, "Non-link packet received in non-active state"); |
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h5_reset_rx(h5); |
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return 0; |
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} |
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h5->rx_func = h5_rx_payload; |
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h5->rx_pending = H5_HDR_LEN(hdr); |
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|
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return 0; |
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} |
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static int h5_rx_pkt_start(struct hci_uart *hu, unsigned char c) |
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{ |
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struct h5 *h5 = hu->priv; |
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|
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if (c == SLIP_DELIMITER) |
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return 1; |
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|
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h5->rx_func = h5_rx_3wire_hdr; |
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h5->rx_pending = 4; |
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|
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h5->rx_skb = bt_skb_alloc(H5_MAX_LEN, GFP_ATOMIC); |
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if (!h5->rx_skb) { |
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bt_dev_err(hu->hdev, "Can't allocate mem for new packet"); |
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h5_reset_rx(h5); |
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return -ENOMEM; |
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} |
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h5->rx_skb->dev = (void *)hu->hdev; |
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return 0; |
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} |
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|
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static int h5_rx_delimiter(struct hci_uart *hu, unsigned char c) |
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{ |
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struct h5 *h5 = hu->priv; |
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|
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if (c == SLIP_DELIMITER) |
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h5->rx_func = h5_rx_pkt_start; |
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|
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return 1; |
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} |
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|
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static void h5_unslip_one_byte(struct h5 *h5, unsigned char c) |
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{ |
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const u8 delim = SLIP_DELIMITER, esc = SLIP_ESC; |
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const u8 *byte = &c; |
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|
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if (!test_bit(H5_RX_ESC, &h5->flags) && c == SLIP_ESC) { |
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set_bit(H5_RX_ESC, &h5->flags); |
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return; |
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} |
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|
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if (test_and_clear_bit(H5_RX_ESC, &h5->flags)) { |
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switch (c) { |
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case SLIP_ESC_DELIM: |
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byte = &delim; |
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break; |
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case SLIP_ESC_ESC: |
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byte = &esc; |
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break; |
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default: |
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BT_ERR("Invalid esc byte 0x%02hhx", c); |
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h5_reset_rx(h5); |
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return; |
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} |
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} |
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|
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skb_put_data(h5->rx_skb, byte, 1); |
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h5->rx_pending--; |
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|
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BT_DBG("unslipped 0x%02hhx, rx_pending %zu", *byte, h5->rx_pending); |
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} |
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|
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static void h5_reset_rx(struct h5 *h5) |
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{ |
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if (h5->rx_skb) { |
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kfree_skb(h5->rx_skb); |
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h5->rx_skb = NULL; |
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} |
|
|
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h5->rx_func = h5_rx_delimiter; |
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h5->rx_pending = 0; |
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clear_bit(H5_RX_ESC, &h5->flags); |
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} |
|
|
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static int h5_recv(struct hci_uart *hu, const void *data, int count) |
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{ |
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struct h5 *h5 = hu->priv; |
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const unsigned char *ptr = data; |
|
|
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BT_DBG("%s pending %zu count %d", hu->hdev->name, h5->rx_pending, |
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count); |
|
|
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while (count > 0) { |
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int processed; |
|
|
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if (h5->rx_pending > 0) { |
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if (*ptr == SLIP_DELIMITER) { |
|
bt_dev_err(hu->hdev, "Too short H5 packet"); |
|
h5_reset_rx(h5); |
|
continue; |
|
} |
|
|
|
h5_unslip_one_byte(h5, *ptr); |
|
|
|
ptr++; count--; |
|
continue; |
|
} |
|
|
|
processed = h5->rx_func(hu, *ptr); |
|
if (processed < 0) |
|
return processed; |
|
|
|
ptr += processed; |
|
count -= processed; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int h5_enqueue(struct hci_uart *hu, struct sk_buff *skb) |
|
{ |
|
struct h5 *h5 = hu->priv; |
|
|
|
if (skb->len > 0xfff) { |
|
bt_dev_err(hu->hdev, "Packet too long (%u bytes)", skb->len); |
|
kfree_skb(skb); |
|
return 0; |
|
} |
|
|
|
if (h5->state != H5_ACTIVE) { |
|
bt_dev_err(hu->hdev, "Ignoring HCI data in non-active state"); |
|
kfree_skb(skb); |
|
return 0; |
|
} |
|
|
|
switch (hci_skb_pkt_type(skb)) { |
|
case HCI_ACLDATA_PKT: |
|
case HCI_COMMAND_PKT: |
|
skb_queue_tail(&h5->rel, skb); |
|
break; |
|
|
|
case HCI_SCODATA_PKT: |
|
case HCI_ISODATA_PKT: |
|
skb_queue_tail(&h5->unrel, skb); |
|
break; |
|
|
|
default: |
|
bt_dev_err(hu->hdev, "Unknown packet type %u", hci_skb_pkt_type(skb)); |
|
kfree_skb(skb); |
|
break; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void h5_slip_delim(struct sk_buff *skb) |
|
{ |
|
const char delim = SLIP_DELIMITER; |
|
|
|
skb_put_data(skb, &delim, 1); |
|
} |
|
|
|
static void h5_slip_one_byte(struct sk_buff *skb, u8 c) |
|
{ |
|
const char esc_delim[2] = { SLIP_ESC, SLIP_ESC_DELIM }; |
|
const char esc_esc[2] = { SLIP_ESC, SLIP_ESC_ESC }; |
|
|
|
switch (c) { |
|
case SLIP_DELIMITER: |
|
skb_put_data(skb, &esc_delim, 2); |
|
break; |
|
case SLIP_ESC: |
|
skb_put_data(skb, &esc_esc, 2); |
|
break; |
|
default: |
|
skb_put_data(skb, &c, 1); |
|
} |
|
} |
|
|
|
static bool valid_packet_type(u8 type) |
|
{ |
|
switch (type) { |
|
case HCI_ACLDATA_PKT: |
|
case HCI_COMMAND_PKT: |
|
case HCI_SCODATA_PKT: |
|
case HCI_ISODATA_PKT: |
|
case HCI_3WIRE_LINK_PKT: |
|
case HCI_3WIRE_ACK_PKT: |
|
return true; |
|
default: |
|
return false; |
|
} |
|
} |
|
|
|
static struct sk_buff *h5_prepare_pkt(struct hci_uart *hu, u8 pkt_type, |
|
const u8 *data, size_t len) |
|
{ |
|
struct h5 *h5 = hu->priv; |
|
struct sk_buff *nskb; |
|
u8 hdr[4]; |
|
int i; |
|
|
|
if (!valid_packet_type(pkt_type)) { |
|
bt_dev_err(hu->hdev, "Unknown packet type %u", pkt_type); |
|
return NULL; |
|
} |
|
|
|
/* |
|
* Max len of packet: (original len + 4 (H5 hdr) + 2 (crc)) * 2 |
|
* (because bytes 0xc0 and 0xdb are escaped, worst case is when |
|
* the packet is all made of 0xc0 and 0xdb) + 2 (0xc0 |
|
* delimiters at start and end). |
|
*/ |
|
nskb = alloc_skb((len + 6) * 2 + 2, GFP_ATOMIC); |
|
if (!nskb) |
|
return NULL; |
|
|
|
hci_skb_pkt_type(nskb) = pkt_type; |
|
|
|
h5_slip_delim(nskb); |
|
|
|
hdr[0] = h5->tx_ack << 3; |
|
clear_bit(H5_TX_ACK_REQ, &h5->flags); |
|
|
|
/* Reliable packet? */ |
|
if (pkt_type == HCI_ACLDATA_PKT || pkt_type == HCI_COMMAND_PKT) { |
|
hdr[0] |= 1 << 7; |
|
hdr[0] |= h5->tx_seq; |
|
h5->tx_seq = (h5->tx_seq + 1) % 8; |
|
} |
|
|
|
hdr[1] = pkt_type | ((len & 0x0f) << 4); |
|
hdr[2] = len >> 4; |
|
hdr[3] = ~((hdr[0] + hdr[1] + hdr[2]) & 0xff); |
|
|
|
BT_DBG("%s tx: seq %u ack %u crc %u rel %u type %u len %u", |
|
hu->hdev->name, H5_HDR_SEQ(hdr), H5_HDR_ACK(hdr), |
|
H5_HDR_CRC(hdr), H5_HDR_RELIABLE(hdr), H5_HDR_PKT_TYPE(hdr), |
|
H5_HDR_LEN(hdr)); |
|
|
|
for (i = 0; i < 4; i++) |
|
h5_slip_one_byte(nskb, hdr[i]); |
|
|
|
for (i = 0; i < len; i++) |
|
h5_slip_one_byte(nskb, data[i]); |
|
|
|
h5_slip_delim(nskb); |
|
|
|
return nskb; |
|
} |
|
|
|
static struct sk_buff *h5_dequeue(struct hci_uart *hu) |
|
{ |
|
struct h5 *h5 = hu->priv; |
|
unsigned long flags; |
|
struct sk_buff *skb, *nskb; |
|
|
|
if (h5->sleep != H5_AWAKE) { |
|
const unsigned char wakeup_req[] = { 0x05, 0xfa }; |
|
|
|
if (h5->sleep == H5_WAKING_UP) |
|
return NULL; |
|
|
|
h5->sleep = H5_WAKING_UP; |
|
BT_DBG("Sending wakeup request"); |
|
|
|
mod_timer(&h5->timer, jiffies + HZ / 100); |
|
return h5_prepare_pkt(hu, HCI_3WIRE_LINK_PKT, wakeup_req, 2); |
|
} |
|
|
|
skb = skb_dequeue(&h5->unrel); |
|
if (skb) { |
|
nskb = h5_prepare_pkt(hu, hci_skb_pkt_type(skb), |
|
skb->data, skb->len); |
|
if (nskb) { |
|
kfree_skb(skb); |
|
return nskb; |
|
} |
|
|
|
skb_queue_head(&h5->unrel, skb); |
|
bt_dev_err(hu->hdev, "Could not dequeue pkt because alloc_skb failed"); |
|
} |
|
|
|
spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING); |
|
|
|
if (h5->unack.qlen >= h5->tx_win) |
|
goto unlock; |
|
|
|
skb = skb_dequeue(&h5->rel); |
|
if (skb) { |
|
nskb = h5_prepare_pkt(hu, hci_skb_pkt_type(skb), |
|
skb->data, skb->len); |
|
if (nskb) { |
|
__skb_queue_tail(&h5->unack, skb); |
|
mod_timer(&h5->timer, jiffies + H5_ACK_TIMEOUT); |
|
spin_unlock_irqrestore(&h5->unack.lock, flags); |
|
return nskb; |
|
} |
|
|
|
skb_queue_head(&h5->rel, skb); |
|
bt_dev_err(hu->hdev, "Could not dequeue pkt because alloc_skb failed"); |
|
} |
|
|
|
unlock: |
|
spin_unlock_irqrestore(&h5->unack.lock, flags); |
|
|
|
if (test_bit(H5_TX_ACK_REQ, &h5->flags)) |
|
return h5_prepare_pkt(hu, HCI_3WIRE_ACK_PKT, NULL, 0); |
|
|
|
return NULL; |
|
} |
|
|
|
static int h5_flush(struct hci_uart *hu) |
|
{ |
|
BT_DBG("hu %p", hu); |
|
return 0; |
|
} |
|
|
|
static const struct hci_uart_proto h5p = { |
|
.id = HCI_UART_3WIRE, |
|
.name = "Three-wire (H5)", |
|
.open = h5_open, |
|
.close = h5_close, |
|
.setup = h5_setup, |
|
.recv = h5_recv, |
|
.enqueue = h5_enqueue, |
|
.dequeue = h5_dequeue, |
|
.flush = h5_flush, |
|
}; |
|
|
|
static int h5_serdev_probe(struct serdev_device *serdev) |
|
{ |
|
struct device *dev = &serdev->dev; |
|
struct h5 *h5; |
|
|
|
h5 = devm_kzalloc(dev, sizeof(*h5), GFP_KERNEL); |
|
if (!h5) |
|
return -ENOMEM; |
|
|
|
h5->hu = &h5->serdev_hu; |
|
h5->serdev_hu.serdev = serdev; |
|
serdev_device_set_drvdata(serdev, h5); |
|
|
|
if (has_acpi_companion(dev)) { |
|
const struct acpi_device_id *match; |
|
|
|
match = acpi_match_device(dev->driver->acpi_match_table, dev); |
|
if (!match) |
|
return -ENODEV; |
|
|
|
h5->vnd = (const struct h5_vnd *)match->driver_data; |
|
h5->id = (char *)match->id; |
|
|
|
if (h5->vnd->acpi_gpio_map) |
|
devm_acpi_dev_add_driver_gpios(dev, |
|
h5->vnd->acpi_gpio_map); |
|
} else { |
|
const void *data; |
|
|
|
data = of_device_get_match_data(dev); |
|
if (!data) |
|
return -ENODEV; |
|
|
|
h5->vnd = (const struct h5_vnd *)data; |
|
} |
|
|
|
|
|
h5->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW); |
|
if (IS_ERR(h5->enable_gpio)) |
|
return PTR_ERR(h5->enable_gpio); |
|
|
|
h5->device_wake_gpio = devm_gpiod_get_optional(dev, "device-wake", |
|
GPIOD_OUT_LOW); |
|
if (IS_ERR(h5->device_wake_gpio)) |
|
return PTR_ERR(h5->device_wake_gpio); |
|
|
|
return hci_uart_register_device(&h5->serdev_hu, &h5p); |
|
} |
|
|
|
static void h5_serdev_remove(struct serdev_device *serdev) |
|
{ |
|
struct h5 *h5 = serdev_device_get_drvdata(serdev); |
|
|
|
hci_uart_unregister_device(&h5->serdev_hu); |
|
} |
|
|
|
static int __maybe_unused h5_serdev_suspend(struct device *dev) |
|
{ |
|
struct h5 *h5 = dev_get_drvdata(dev); |
|
int ret = 0; |
|
|
|
if (h5->vnd && h5->vnd->suspend) |
|
ret = h5->vnd->suspend(h5); |
|
|
|
return ret; |
|
} |
|
|
|
static int __maybe_unused h5_serdev_resume(struct device *dev) |
|
{ |
|
struct h5 *h5 = dev_get_drvdata(dev); |
|
int ret = 0; |
|
|
|
if (h5->vnd && h5->vnd->resume) |
|
ret = h5->vnd->resume(h5); |
|
|
|
return ret; |
|
} |
|
|
|
#ifdef CONFIG_BT_HCIUART_RTL |
|
static int h5_btrtl_setup(struct h5 *h5) |
|
{ |
|
struct btrtl_device_info *btrtl_dev; |
|
struct sk_buff *skb; |
|
__le32 baudrate_data; |
|
u32 device_baudrate; |
|
unsigned int controller_baudrate; |
|
bool flow_control; |
|
int err; |
|
|
|
btrtl_dev = btrtl_initialize(h5->hu->hdev, h5->id); |
|
if (IS_ERR(btrtl_dev)) |
|
return PTR_ERR(btrtl_dev); |
|
|
|
err = btrtl_get_uart_settings(h5->hu->hdev, btrtl_dev, |
|
&controller_baudrate, &device_baudrate, |
|
&flow_control); |
|
if (err) |
|
goto out_free; |
|
|
|
baudrate_data = cpu_to_le32(device_baudrate); |
|
skb = __hci_cmd_sync(h5->hu->hdev, 0xfc17, sizeof(baudrate_data), |
|
&baudrate_data, HCI_INIT_TIMEOUT); |
|
if (IS_ERR(skb)) { |
|
rtl_dev_err(h5->hu->hdev, "set baud rate command failed\n"); |
|
err = PTR_ERR(skb); |
|
goto out_free; |
|
} else { |
|
kfree_skb(skb); |
|
} |
|
/* Give the device some time to set up the new baudrate. */ |
|
usleep_range(10000, 20000); |
|
|
|
serdev_device_set_baudrate(h5->hu->serdev, controller_baudrate); |
|
serdev_device_set_flow_control(h5->hu->serdev, flow_control); |
|
|
|
err = btrtl_download_firmware(h5->hu->hdev, btrtl_dev); |
|
/* Give the device some time before the hci-core sends it a reset */ |
|
usleep_range(10000, 20000); |
|
|
|
/* Enable controller to do both LE scan and BR/EDR inquiry |
|
* simultaneously. |
|
*/ |
|
set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &h5->hu->hdev->quirks); |
|
|
|
out_free: |
|
btrtl_free(btrtl_dev); |
|
|
|
return err; |
|
} |
|
|
|
static void h5_btrtl_open(struct h5 *h5) |
|
{ |
|
/* Devices always start with these fixed parameters */ |
|
serdev_device_set_flow_control(h5->hu->serdev, false); |
|
serdev_device_set_parity(h5->hu->serdev, SERDEV_PARITY_EVEN); |
|
serdev_device_set_baudrate(h5->hu->serdev, 115200); |
|
|
|
/* The controller needs up to 500ms to wakeup */ |
|
gpiod_set_value_cansleep(h5->enable_gpio, 1); |
|
gpiod_set_value_cansleep(h5->device_wake_gpio, 1); |
|
msleep(500); |
|
} |
|
|
|
static void h5_btrtl_close(struct h5 *h5) |
|
{ |
|
gpiod_set_value_cansleep(h5->device_wake_gpio, 0); |
|
gpiod_set_value_cansleep(h5->enable_gpio, 0); |
|
} |
|
|
|
/* Suspend/resume support. On many devices the RTL BT device loses power during |
|
* suspend/resume, causing it to lose its firmware and all state. So we simply |
|
* turn it off on suspend and reprobe on resume. This mirrors how RTL devices |
|
* are handled in the USB driver, where the USB_QUIRK_RESET_RESUME is used which |
|
* also causes a reprobe on resume. |
|
*/ |
|
static int h5_btrtl_suspend(struct h5 *h5) |
|
{ |
|
serdev_device_set_flow_control(h5->hu->serdev, false); |
|
gpiod_set_value_cansleep(h5->device_wake_gpio, 0); |
|
gpiod_set_value_cansleep(h5->enable_gpio, 0); |
|
return 0; |
|
} |
|
|
|
struct h5_btrtl_reprobe { |
|
struct device *dev; |
|
struct work_struct work; |
|
}; |
|
|
|
static void h5_btrtl_reprobe_worker(struct work_struct *work) |
|
{ |
|
struct h5_btrtl_reprobe *reprobe = |
|
container_of(work, struct h5_btrtl_reprobe, work); |
|
int ret; |
|
|
|
ret = device_reprobe(reprobe->dev); |
|
if (ret && ret != -EPROBE_DEFER) |
|
dev_err(reprobe->dev, "Reprobe error %d\n", ret); |
|
|
|
put_device(reprobe->dev); |
|
kfree(reprobe); |
|
module_put(THIS_MODULE); |
|
} |
|
|
|
static int h5_btrtl_resume(struct h5 *h5) |
|
{ |
|
struct h5_btrtl_reprobe *reprobe; |
|
|
|
reprobe = kzalloc(sizeof(*reprobe), GFP_KERNEL); |
|
if (!reprobe) |
|
return -ENOMEM; |
|
|
|
__module_get(THIS_MODULE); |
|
|
|
INIT_WORK(&reprobe->work, h5_btrtl_reprobe_worker); |
|
reprobe->dev = get_device(&h5->hu->serdev->dev); |
|
queue_work(system_long_wq, &reprobe->work); |
|
return 0; |
|
} |
|
|
|
static const struct acpi_gpio_params btrtl_device_wake_gpios = { 0, 0, false }; |
|
static const struct acpi_gpio_params btrtl_enable_gpios = { 1, 0, false }; |
|
static const struct acpi_gpio_params btrtl_host_wake_gpios = { 2, 0, false }; |
|
static const struct acpi_gpio_mapping acpi_btrtl_gpios[] = { |
|
{ "device-wake-gpios", &btrtl_device_wake_gpios, 1 }, |
|
{ "enable-gpios", &btrtl_enable_gpios, 1 }, |
|
{ "host-wake-gpios", &btrtl_host_wake_gpios, 1 }, |
|
{}, |
|
}; |
|
|
|
static struct h5_vnd rtl_vnd = { |
|
.setup = h5_btrtl_setup, |
|
.open = h5_btrtl_open, |
|
.close = h5_btrtl_close, |
|
.suspend = h5_btrtl_suspend, |
|
.resume = h5_btrtl_resume, |
|
.acpi_gpio_map = acpi_btrtl_gpios, |
|
}; |
|
#endif |
|
|
|
#ifdef CONFIG_ACPI |
|
static const struct acpi_device_id h5_acpi_match[] = { |
|
#ifdef CONFIG_BT_HCIUART_RTL |
|
{ "OBDA0623", (kernel_ulong_t)&rtl_vnd }, |
|
{ "OBDA8723", (kernel_ulong_t)&rtl_vnd }, |
|
#endif |
|
{ }, |
|
}; |
|
MODULE_DEVICE_TABLE(acpi, h5_acpi_match); |
|
#endif |
|
|
|
static const struct dev_pm_ops h5_serdev_pm_ops = { |
|
SET_SYSTEM_SLEEP_PM_OPS(h5_serdev_suspend, h5_serdev_resume) |
|
}; |
|
|
|
static const struct of_device_id rtl_bluetooth_of_match[] = { |
|
#ifdef CONFIG_BT_HCIUART_RTL |
|
{ .compatible = "realtek,rtl8822cs-bt", |
|
.data = (const void *)&rtl_vnd }, |
|
{ .compatible = "realtek,rtl8723bs-bt", |
|
.data = (const void *)&rtl_vnd }, |
|
{ .compatible = "realtek,rtl8723ds-bt", |
|
.data = (const void *)&rtl_vnd }, |
|
#endif |
|
{ }, |
|
}; |
|
MODULE_DEVICE_TABLE(of, rtl_bluetooth_of_match); |
|
|
|
static struct serdev_device_driver h5_serdev_driver = { |
|
.probe = h5_serdev_probe, |
|
.remove = h5_serdev_remove, |
|
.driver = { |
|
.name = "hci_uart_h5", |
|
.acpi_match_table = ACPI_PTR(h5_acpi_match), |
|
.pm = &h5_serdev_pm_ops, |
|
.of_match_table = rtl_bluetooth_of_match, |
|
}, |
|
}; |
|
|
|
int __init h5_init(void) |
|
{ |
|
serdev_device_driver_register(&h5_serdev_driver); |
|
return hci_uart_register_proto(&h5p); |
|
} |
|
|
|
int __exit h5_deinit(void) |
|
{ |
|
serdev_device_driver_unregister(&h5_serdev_driver); |
|
return hci_uart_unregister_proto(&h5p); |
|
}
|
|
|