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![Rob Herring](/assets/img/avatar_default.png)
The DT of_device.h and of_platform.h date back to the separate of_platform_bus_type before it as merged into the regular platform bus. As part of that merge prepping Arm DT support 13 years ago, they "temporarily" include each other. They also include platform_device.h and of.h. As a result, there's a pretty much random mix of those include files used throughout the tree. In order to detangle these headers and replace the implicit includes with struct declarations, users need to explicitly include the correct includes. Signed-off-by: Rob Herring <robh@kernel.org> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
1137 lines
26 KiB
C
1137 lines
26 KiB
C
// 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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#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.h>
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#include <linux/pm_runtime.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 "btrtl.h"
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#include "hci_uart.h"
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#define SUSPEND_TIMEOUT_MS 6000
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#define HCI_3WIRE_ACK_PKT 0
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#define HCI_3WIRE_LINK_PKT 15
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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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* 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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/* 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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/* 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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H5_WAKEUP_DISABLE, /* Device cannot wake host */
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H5_HW_FLOW_CONTROL, /* Use HW flow control */
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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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enum h5_driver_info {
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H5_INFO_WAKEUP_DISABLE = BIT(0),
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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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struct h5_device_data {
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uint32_t driver_info;
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struct h5_vnd *vnd;
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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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dev_kfree_skb_irq(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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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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|
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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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set_bit(H5_TX_ACK_REQ, &h5->flags);
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hci_uart_tx_wakeup(hu);
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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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return 0;
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}
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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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|
|
|
h5->rx_func = h5_rx_3wire_hdr;
|
|
h5->rx_pending = 4;
|
|
|
|
h5->rx_skb = bt_skb_alloc(H5_MAX_LEN, GFP_ATOMIC);
|
|
if (!h5->rx_skb) {
|
|
bt_dev_err(hu->hdev, "Can't allocate mem for new packet");
|
|
h5_reset_rx(h5);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
h5->rx_skb->dev = (void *)hu->hdev;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int h5_rx_delimiter(struct hci_uart *hu, unsigned char c)
|
|
{
|
|
struct h5 *h5 = hu->priv;
|
|
|
|
if (c == SLIP_DELIMITER)
|
|
h5->rx_func = h5_rx_pkt_start;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void h5_unslip_one_byte(struct h5 *h5, unsigned char c)
|
|
{
|
|
const u8 delim = SLIP_DELIMITER, esc = SLIP_ESC;
|
|
const u8 *byte = &c;
|
|
|
|
if (!test_bit(H5_RX_ESC, &h5->flags) && c == SLIP_ESC) {
|
|
set_bit(H5_RX_ESC, &h5->flags);
|
|
return;
|
|
}
|
|
|
|
if (test_and_clear_bit(H5_RX_ESC, &h5->flags)) {
|
|
switch (c) {
|
|
case SLIP_ESC_DELIM:
|
|
byte = &delim;
|
|
break;
|
|
case SLIP_ESC_ESC:
|
|
byte = &esc;
|
|
break;
|
|
default:
|
|
BT_ERR("Invalid esc byte 0x%02hhx", c);
|
|
h5_reset_rx(h5);
|
|
return;
|
|
}
|
|
}
|
|
|
|
skb_put_data(h5->rx_skb, byte, 1);
|
|
h5->rx_pending--;
|
|
|
|
BT_DBG("unslipped 0x%02hhx, rx_pending %zu", *byte, h5->rx_pending);
|
|
}
|
|
|
|
static void h5_reset_rx(struct h5 *h5)
|
|
{
|
|
if (h5->rx_skb) {
|
|
kfree_skb(h5->rx_skb);
|
|
h5->rx_skb = NULL;
|
|
}
|
|
|
|
h5->rx_func = h5_rx_delimiter;
|
|
h5->rx_pending = 0;
|
|
clear_bit(H5_RX_ESC, &h5->flags);
|
|
}
|
|
|
|
static int h5_recv(struct hci_uart *hu, const void *data, int count)
|
|
{
|
|
struct h5 *h5 = hu->priv;
|
|
const unsigned char *ptr = data;
|
|
|
|
BT_DBG("%s pending %zu count %d", hu->hdev->name, h5->rx_pending,
|
|
count);
|
|
|
|
while (count > 0) {
|
|
int processed;
|
|
|
|
if (h5->rx_pending > 0) {
|
|
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;
|
|
}
|
|
|
|
if (hu->serdev) {
|
|
pm_runtime_get(&hu->serdev->dev);
|
|
pm_runtime_mark_last_busy(&hu->serdev->dev);
|
|
pm_runtime_put_autosuspend(&hu->serdev->dev);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
if (hu->serdev) {
|
|
pm_runtime_get_sync(&hu->serdev->dev);
|
|
pm_runtime_mark_last_busy(&hu->serdev->dev);
|
|
pm_runtime_put_autosuspend(&hu->serdev->dev);
|
|
}
|
|
|
|
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;
|
|
const struct h5_device_data *data;
|
|
|
|
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;
|
|
|
|
data = (const struct h5_device_data *)match->driver_data;
|
|
h5->vnd = data->vnd;
|
|
h5->id = (char *)match->id;
|
|
|
|
if (h5->vnd->acpi_gpio_map)
|
|
devm_acpi_dev_add_driver_gpios(dev,
|
|
h5->vnd->acpi_gpio_map);
|
|
} else {
|
|
data = of_device_get_match_data(dev);
|
|
if (!data)
|
|
return -ENODEV;
|
|
|
|
h5->vnd = data->vnd;
|
|
}
|
|
|
|
if (data->driver_info & H5_INFO_WAKEUP_DISABLE)
|
|
set_bit(H5_WAKEUP_DISABLE, &h5->flags);
|
|
|
|
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);
|
|
|
|
if (flow_control)
|
|
set_bit(H5_HW_FLOW_CONTROL, &h5->flags);
|
|
|
|
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);
|
|
if (err)
|
|
goto out_free;
|
|
|
|
btrtl_set_quirks(h5->hu->hdev, btrtl_dev);
|
|
|
|
out_free:
|
|
btrtl_free(btrtl_dev);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void h5_btrtl_open(struct h5 *h5)
|
|
{
|
|
/*
|
|
* Since h5_btrtl_resume() does a device_reprobe() the suspend handling
|
|
* done by the hci_suspend_notifier is not necessary; it actually causes
|
|
* delays and a bunch of errors to get logged, so disable it.
|
|
*/
|
|
if (test_bit(H5_WAKEUP_DISABLE, &h5->flags))
|
|
set_bit(HCI_UART_NO_SUSPEND_NOTIFIER, &h5->hu->flags);
|
|
|
|
/* 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);
|
|
|
|
if (!test_bit(H5_WAKEUP_DISABLE, &h5->flags)) {
|
|
pm_runtime_set_active(&h5->hu->serdev->dev);
|
|
pm_runtime_use_autosuspend(&h5->hu->serdev->dev);
|
|
pm_runtime_set_autosuspend_delay(&h5->hu->serdev->dev,
|
|
SUSPEND_TIMEOUT_MS);
|
|
pm_runtime_enable(&h5->hu->serdev->dev);
|
|
}
|
|
|
|
/* The controller needs reset to startup */
|
|
gpiod_set_value_cansleep(h5->enable_gpio, 0);
|
|
gpiod_set_value_cansleep(h5->device_wake_gpio, 0);
|
|
msleep(100);
|
|
|
|
/* 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)
|
|
{
|
|
if (!test_bit(H5_WAKEUP_DISABLE, &h5->flags))
|
|
pm_runtime_disable(&h5->hu->serdev->dev);
|
|
|
|
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 BTUSB_WAKEUP_DISABLE 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);
|
|
|
|
if (test_bit(H5_WAKEUP_DISABLE, &h5->flags))
|
|
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)
|
|
{
|
|
if (test_bit(H5_WAKEUP_DISABLE, &h5->flags)) {
|
|
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);
|
|
} else {
|
|
gpiod_set_value_cansleep(h5->device_wake_gpio, 1);
|
|
|
|
if (test_bit(H5_HW_FLOW_CONTROL, &h5->flags))
|
|
serdev_device_set_flow_control(h5->hu->serdev, true);
|
|
}
|
|
|
|
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,
|
|
};
|
|
|
|
static const struct h5_device_data h5_data_rtl8822cs = {
|
|
.vnd = &rtl_vnd,
|
|
};
|
|
|
|
static const struct h5_device_data h5_data_rtl8723bs = {
|
|
.driver_info = H5_INFO_WAKEUP_DISABLE,
|
|
.vnd = &rtl_vnd,
|
|
};
|
|
#endif
|
|
|
|
#ifdef CONFIG_ACPI
|
|
static const struct acpi_device_id h5_acpi_match[] = {
|
|
#ifdef CONFIG_BT_HCIUART_RTL
|
|
{ "OBDA0623", (kernel_ulong_t)&h5_data_rtl8723bs },
|
|
{ "OBDA8723", (kernel_ulong_t)&h5_data_rtl8723bs },
|
|
#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)
|
|
SET_RUNTIME_PM_OPS(h5_serdev_suspend, h5_serdev_resume, NULL)
|
|
};
|
|
|
|
static const struct of_device_id rtl_bluetooth_of_match[] = {
|
|
#ifdef CONFIG_BT_HCIUART_RTL
|
|
{ .compatible = "realtek,rtl8822cs-bt",
|
|
.data = (const void *)&h5_data_rtl8822cs },
|
|
{ .compatible = "realtek,rtl8723bs-bt",
|
|
.data = (const void *)&h5_data_rtl8723bs },
|
|
{ .compatible = "realtek,rtl8723cs-bt",
|
|
.data = (const void *)&h5_data_rtl8723bs },
|
|
{ .compatible = "realtek,rtl8723ds-bt",
|
|
.data = (const void *)&h5_data_rtl8723bs },
|
|
#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);
|
|
}
|