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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 *4 * Bluetooth HCI Three-wire UART driver5 *6 * Copyright (C) 2012 Intel Corporation7 */8 9#include <linux/acpi.h>10#include <linux/errno.h>11#include <linux/gpio/consumer.h>12#include <linux/kernel.h>13#include <linux/mod_devicetable.h>14#include <linux/of.h>15#include <linux/pm_runtime.h>16#include <linux/serdev.h>17#include <linux/skbuff.h>18 19#include <net/bluetooth/bluetooth.h>20#include <net/bluetooth/hci_core.h>21 22#include "btrtl.h"23#include "hci_uart.h"24 25#define SUSPEND_TIMEOUT_MS 600026 27#define HCI_3WIRE_ACK_PKT 028#define HCI_3WIRE_LINK_PKT 1529 30/* Sliding window size */31#define H5_TX_WIN_MAX 432 33#define H5_ACK_TIMEOUT msecs_to_jiffies(250)34#define H5_SYNC_TIMEOUT msecs_to_jiffies(100)35 36/*37 * Maximum Three-wire packet:38 * 4 byte header + max value for 12-bit length + 2 bytes for CRC39 */40#define H5_MAX_LEN (4 + 0xfff + 2)41 42/* Convenience macros for reading Three-wire header values */43#define H5_HDR_SEQ(hdr) ((hdr)[0] & 0x07)44#define H5_HDR_ACK(hdr) (((hdr)[0] >> 3) & 0x07)45#define H5_HDR_CRC(hdr) (((hdr)[0] >> 6) & 0x01)46#define H5_HDR_RELIABLE(hdr) (((hdr)[0] >> 7) & 0x01)47#define H5_HDR_PKT_TYPE(hdr) ((hdr)[1] & 0x0f)48#define H5_HDR_LEN(hdr) ((((hdr)[1] >> 4) & 0x0f) + ((hdr)[2] << 4))49 50#define SLIP_DELIMITER 0xc051#define SLIP_ESC 0xdb52#define SLIP_ESC_DELIM 0xdc53#define SLIP_ESC_ESC 0xdd54 55/* H5 state flags */56enum {57 H5_RX_ESC, /* SLIP escape mode */58 H5_TX_ACK_REQ, /* Pending ack to send */59 H5_WAKEUP_DISABLE, /* Device cannot wake host */60 H5_HW_FLOW_CONTROL, /* Use HW flow control */61};62 63struct h5 {64 /* Must be the first member, hci_serdev.c expects this. */65 struct hci_uart serdev_hu;66 67 struct sk_buff_head unack; /* Unack'ed packets queue */68 struct sk_buff_head rel; /* Reliable packets queue */69 struct sk_buff_head unrel; /* Unreliable packets queue */70 71 unsigned long flags;72 73 struct sk_buff *rx_skb; /* Receive buffer */74 size_t rx_pending; /* Expecting more bytes */75 u8 rx_ack; /* Last ack number received */76 77 int (*rx_func)(struct hci_uart *hu, u8 c);78 79 struct timer_list timer; /* Retransmission timer */80 struct hci_uart *hu; /* Parent HCI UART */81 82 u8 tx_seq; /* Next seq number to send */83 u8 tx_ack; /* Next ack number to send */84 u8 tx_win; /* Sliding window size */85 86 enum {87 H5_UNINITIALIZED,88 H5_INITIALIZED,89 H5_ACTIVE,90 } state;91 92 enum {93 H5_AWAKE,94 H5_SLEEPING,95 H5_WAKING_UP,96 } sleep;97 98 const struct h5_vnd *vnd;99 const char *id;100 101 struct gpio_desc *enable_gpio;102 struct gpio_desc *device_wake_gpio;103};104 105enum h5_driver_info {106 H5_INFO_WAKEUP_DISABLE = BIT(0),107};108 109struct h5_vnd {110 int (*setup)(struct h5 *h5);111 void (*open)(struct h5 *h5);112 void (*close)(struct h5 *h5);113 int (*suspend)(struct h5 *h5);114 int (*resume)(struct h5 *h5);115 const struct acpi_gpio_mapping *acpi_gpio_map;116 int sizeof_priv;117};118 119struct h5_device_data {120 uint32_t driver_info;121 struct h5_vnd *vnd;122};123 124static void h5_reset_rx(struct h5 *h5);125 126static void h5_link_control(struct hci_uart *hu, const void *data, size_t len)127{128 struct h5 *h5 = hu->priv;129 struct sk_buff *nskb;130 131 nskb = alloc_skb(3, GFP_ATOMIC);132 if (!nskb)133 return;134 135 hci_skb_pkt_type(nskb) = HCI_3WIRE_LINK_PKT;136 137 skb_put_data(nskb, data, len);138 139 skb_queue_tail(&h5->unrel, nskb);140}141 142static u8 h5_cfg_field(struct h5 *h5)143{144 /* Sliding window size (first 3 bits) */145 return h5->tx_win & 0x07;146}147 148static void h5_timed_event(struct timer_list *t)149{150 const unsigned char sync_req[] = { 0x01, 0x7e };151 unsigned char conf_req[3] = { 0x03, 0xfc };152 struct h5 *h5 = from_timer(h5, t, timer);153 struct hci_uart *hu = h5->hu;154 struct sk_buff *skb;155 unsigned long flags;156 157 BT_DBG("%s", hu->hdev->name);158 159 if (h5->state == H5_UNINITIALIZED)160 h5_link_control(hu, sync_req, sizeof(sync_req));161 162 if (h5->state == H5_INITIALIZED) {163 conf_req[2] = h5_cfg_field(h5);164 h5_link_control(hu, conf_req, sizeof(conf_req));165 }166 167 if (h5->state != H5_ACTIVE) {168 mod_timer(&h5->timer, jiffies + H5_SYNC_TIMEOUT);169 goto wakeup;170 }171 172 if (h5->sleep != H5_AWAKE) {173 h5->sleep = H5_SLEEPING;174 goto wakeup;175 }176 177 BT_DBG("hu %p retransmitting %u pkts", hu, h5->unack.qlen);178 179 spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING);180 181 while ((skb = __skb_dequeue_tail(&h5->unack)) != NULL) {182 h5->tx_seq = (h5->tx_seq - 1) & 0x07;183 skb_queue_head(&h5->rel, skb);184 }185 186 spin_unlock_irqrestore(&h5->unack.lock, flags);187 188wakeup:189 hci_uart_tx_wakeup(hu);190}191 192static void h5_peer_reset(struct hci_uart *hu)193{194 struct h5 *h5 = hu->priv;195 196 bt_dev_err(hu->hdev, "Peer device has reset");197 198 h5->state = H5_UNINITIALIZED;199 200 del_timer(&h5->timer);201 202 skb_queue_purge(&h5->rel);203 skb_queue_purge(&h5->unrel);204 skb_queue_purge(&h5->unack);205 206 h5->tx_seq = 0;207 h5->tx_ack = 0;208 209 /* Send reset request to upper stack */210 hci_reset_dev(hu->hdev);211}212 213static int h5_open(struct hci_uart *hu)214{215 struct h5 *h5;216 const unsigned char sync[] = { 0x01, 0x7e };217 218 BT_DBG("hu %p", hu);219 220 if (hu->serdev) {221 h5 = serdev_device_get_drvdata(hu->serdev);222 } else {223 h5 = kzalloc(sizeof(*h5), GFP_KERNEL);224 if (!h5)225 return -ENOMEM;226 }227 228 hu->priv = h5;229 h5->hu = hu;230 231 skb_queue_head_init(&h5->unack);232 skb_queue_head_init(&h5->rel);233 skb_queue_head_init(&h5->unrel);234 235 h5_reset_rx(h5);236 237 timer_setup(&h5->timer, h5_timed_event, 0);238 239 h5->tx_win = H5_TX_WIN_MAX;240 241 if (h5->vnd && h5->vnd->open)242 h5->vnd->open(h5);243 244 set_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags);245 246 /* Send initial sync request */247 h5_link_control(hu, sync, sizeof(sync));248 mod_timer(&h5->timer, jiffies + H5_SYNC_TIMEOUT);249 250 return 0;251}252 253static int h5_close(struct hci_uart *hu)254{255 struct h5 *h5 = hu->priv;256 257 del_timer_sync(&h5->timer);258 259 skb_queue_purge(&h5->unack);260 skb_queue_purge(&h5->rel);261 skb_queue_purge(&h5->unrel);262 263 kfree_skb(h5->rx_skb);264 h5->rx_skb = NULL;265 266 if (h5->vnd && h5->vnd->close)267 h5->vnd->close(h5);268 269 if (!hu->serdev)270 kfree(h5);271 272 return 0;273}274 275static int h5_setup(struct hci_uart *hu)276{277 struct h5 *h5 = hu->priv;278 279 if (h5->vnd && h5->vnd->setup)280 return h5->vnd->setup(h5);281 282 return 0;283}284 285static void h5_pkt_cull(struct h5 *h5)286{287 struct sk_buff *skb, *tmp;288 unsigned long flags;289 int i, to_remove;290 u8 seq;291 292 spin_lock_irqsave(&h5->unack.lock, flags);293 294 to_remove = skb_queue_len(&h5->unack);295 if (to_remove == 0)296 goto unlock;297 298 seq = h5->tx_seq;299 300 while (to_remove > 0) {301 if (h5->rx_ack == seq)302 break;303 304 to_remove--;305 seq = (seq - 1) & 0x07;306 }307 308 if (seq != h5->rx_ack)309 BT_ERR("Controller acked invalid packet");310 311 i = 0;312 skb_queue_walk_safe(&h5->unack, skb, tmp) {313 if (i++ >= to_remove)314 break;315 316 __skb_unlink(skb, &h5->unack);317 dev_kfree_skb_irq(skb);318 }319 320 if (skb_queue_empty(&h5->unack))321 del_timer(&h5->timer);322 323unlock:324 spin_unlock_irqrestore(&h5->unack.lock, flags);325}326 327static void h5_handle_internal_rx(struct hci_uart *hu)328{329 struct h5 *h5 = hu->priv;330 const unsigned char sync_req[] = { 0x01, 0x7e };331 const unsigned char sync_rsp[] = { 0x02, 0x7d };332 unsigned char conf_req[3] = { 0x03, 0xfc };333 const unsigned char conf_rsp[] = { 0x04, 0x7b };334 const unsigned char wakeup_req[] = { 0x05, 0xfa };335 const unsigned char woken_req[] = { 0x06, 0xf9 };336 const unsigned char sleep_req[] = { 0x07, 0x78 };337 const unsigned char *hdr = h5->rx_skb->data;338 const unsigned char *data = &h5->rx_skb->data[4];339 340 BT_DBG("%s", hu->hdev->name);341 342 if (H5_HDR_PKT_TYPE(hdr) != HCI_3WIRE_LINK_PKT)343 return;344 345 if (H5_HDR_LEN(hdr) < 2)346 return;347 348 conf_req[2] = h5_cfg_field(h5);349 350 if (memcmp(data, sync_req, 2) == 0) {351 if (h5->state == H5_ACTIVE)352 h5_peer_reset(hu);353 h5_link_control(hu, sync_rsp, 2);354 } else if (memcmp(data, sync_rsp, 2) == 0) {355 if (h5->state == H5_ACTIVE)356 h5_peer_reset(hu);357 h5->state = H5_INITIALIZED;358 h5_link_control(hu, conf_req, 3);359 } else if (memcmp(data, conf_req, 2) == 0) {360 h5_link_control(hu, conf_rsp, 2);361 h5_link_control(hu, conf_req, 3);362 } else if (memcmp(data, conf_rsp, 2) == 0) {363 if (H5_HDR_LEN(hdr) > 2)364 h5->tx_win = (data[2] & 0x07);365 BT_DBG("Three-wire init complete. tx_win %u", h5->tx_win);366 h5->state = H5_ACTIVE;367 hci_uart_init_ready(hu);368 return;369 } else if (memcmp(data, sleep_req, 2) == 0) {370 BT_DBG("Peer went to sleep");371 h5->sleep = H5_SLEEPING;372 return;373 } else if (memcmp(data, woken_req, 2) == 0) {374 BT_DBG("Peer woke up");375 h5->sleep = H5_AWAKE;376 } else if (memcmp(data, wakeup_req, 2) == 0) {377 BT_DBG("Peer requested wakeup");378 h5_link_control(hu, woken_req, 2);379 h5->sleep = H5_AWAKE;380 } else {381 BT_DBG("Link Control: 0x%02hhx 0x%02hhx", data[0], data[1]);382 return;383 }384 385 hci_uart_tx_wakeup(hu);386}387 388static void h5_complete_rx_pkt(struct hci_uart *hu)389{390 struct h5 *h5 = hu->priv;391 const unsigned char *hdr = h5->rx_skb->data;392 393 if (H5_HDR_RELIABLE(hdr)) {394 h5->tx_ack = (h5->tx_ack + 1) % 8;395 set_bit(H5_TX_ACK_REQ, &h5->flags);396 hci_uart_tx_wakeup(hu);397 }398 399 h5->rx_ack = H5_HDR_ACK(hdr);400 401 h5_pkt_cull(h5);402 403 switch (H5_HDR_PKT_TYPE(hdr)) {404 case HCI_EVENT_PKT:405 case HCI_ACLDATA_PKT:406 case HCI_SCODATA_PKT:407 case HCI_ISODATA_PKT:408 hci_skb_pkt_type(h5->rx_skb) = H5_HDR_PKT_TYPE(hdr);409 410 /* Remove Three-wire header */411 skb_pull(h5->rx_skb, 4);412 413 hci_recv_frame(hu->hdev, h5->rx_skb);414 h5->rx_skb = NULL;415 416 break;417 418 default:419 h5_handle_internal_rx(hu);420 break;421 }422 423 h5_reset_rx(h5);424}425 426static int h5_rx_crc(struct hci_uart *hu, unsigned char c)427{428 h5_complete_rx_pkt(hu);429 430 return 0;431}432 433static int h5_rx_payload(struct hci_uart *hu, unsigned char c)434{435 struct h5 *h5 = hu->priv;436 const unsigned char *hdr = h5->rx_skb->data;437 438 if (H5_HDR_CRC(hdr)) {439 h5->rx_func = h5_rx_crc;440 h5->rx_pending = 2;441 } else {442 h5_complete_rx_pkt(hu);443 }444 445 return 0;446}447 448static int h5_rx_3wire_hdr(struct hci_uart *hu, unsigned char c)449{450 struct h5 *h5 = hu->priv;451 const unsigned char *hdr = h5->rx_skb->data;452 453 BT_DBG("%s rx: seq %u ack %u crc %u rel %u type %u len %u",454 hu->hdev->name, H5_HDR_SEQ(hdr), H5_HDR_ACK(hdr),455 H5_HDR_CRC(hdr), H5_HDR_RELIABLE(hdr), H5_HDR_PKT_TYPE(hdr),456 H5_HDR_LEN(hdr));457 458 if (((hdr[0] + hdr[1] + hdr[2] + hdr[3]) & 0xff) != 0xff) {459 bt_dev_err(hu->hdev, "Invalid header checksum");460 h5_reset_rx(h5);461 return 0;462 }463 464 if (H5_HDR_RELIABLE(hdr) && H5_HDR_SEQ(hdr) != h5->tx_ack) {465 bt_dev_err(hu->hdev, "Out-of-order packet arrived (%u != %u)",466 H5_HDR_SEQ(hdr), h5->tx_ack);467 set_bit(H5_TX_ACK_REQ, &h5->flags);468 hci_uart_tx_wakeup(hu);469 h5_reset_rx(h5);470 return 0;471 }472 473 if (h5->state != H5_ACTIVE &&474 H5_HDR_PKT_TYPE(hdr) != HCI_3WIRE_LINK_PKT) {475 bt_dev_err(hu->hdev, "Non-link packet received in non-active state");476 h5_reset_rx(h5);477 return 0;478 }479 480 h5->rx_func = h5_rx_payload;481 h5->rx_pending = H5_HDR_LEN(hdr);482 483 return 0;484}485 486static int h5_rx_pkt_start(struct hci_uart *hu, unsigned char c)487{488 struct h5 *h5 = hu->priv;489 490 if (c == SLIP_DELIMITER)491 return 1;492 493 h5->rx_func = h5_rx_3wire_hdr;494 h5->rx_pending = 4;495 496 h5->rx_skb = bt_skb_alloc(H5_MAX_LEN, GFP_ATOMIC);497 if (!h5->rx_skb) {498 bt_dev_err(hu->hdev, "Can't allocate mem for new packet");499 h5_reset_rx(h5);500 return -ENOMEM;501 }502 503 h5->rx_skb->dev = (void *)hu->hdev;504 505 return 0;506}507 508static int h5_rx_delimiter(struct hci_uart *hu, unsigned char c)509{510 struct h5 *h5 = hu->priv;511 512 if (c == SLIP_DELIMITER)513 h5->rx_func = h5_rx_pkt_start;514 515 return 1;516}517 518static void h5_unslip_one_byte(struct h5 *h5, unsigned char c)519{520 const u8 delim = SLIP_DELIMITER, esc = SLIP_ESC;521 const u8 *byte = &c;522 523 if (!test_bit(H5_RX_ESC, &h5->flags) && c == SLIP_ESC) {524 set_bit(H5_RX_ESC, &h5->flags);525 return;526 }527 528 if (test_and_clear_bit(H5_RX_ESC, &h5->flags)) {529 switch (c) {530 case SLIP_ESC_DELIM:531 byte = &delim;532 break;533 case SLIP_ESC_ESC:534 byte = &esc;535 break;536 default:537 BT_ERR("Invalid esc byte 0x%02hhx", c);538 h5_reset_rx(h5);539 return;540 }541 }542 543 skb_put_data(h5->rx_skb, byte, 1);544 h5->rx_pending--;545 546 BT_DBG("unslipped 0x%02hhx, rx_pending %zu", *byte, h5->rx_pending);547}548 549static void h5_reset_rx(struct h5 *h5)550{551 if (h5->rx_skb) {552 kfree_skb(h5->rx_skb);553 h5->rx_skb = NULL;554 }555 556 h5->rx_func = h5_rx_delimiter;557 h5->rx_pending = 0;558 clear_bit(H5_RX_ESC, &h5->flags);559}560 561static int h5_recv(struct hci_uart *hu, const void *data, int count)562{563 struct h5 *h5 = hu->priv;564 const unsigned char *ptr = data;565 566 BT_DBG("%s pending %zu count %d", hu->hdev->name, h5->rx_pending,567 count);568 569 while (count > 0) {570 int processed;571 572 if (h5->rx_pending > 0) {573 if (*ptr == SLIP_DELIMITER) {574 bt_dev_err(hu->hdev, "Too short H5 packet");575 h5_reset_rx(h5);576 continue;577 }578 579 h5_unslip_one_byte(h5, *ptr);580 581 ptr++; count--;582 continue;583 }584 585 processed = h5->rx_func(hu, *ptr);586 if (processed < 0)587 return processed;588 589 ptr += processed;590 count -= processed;591 }592 593 if (hu->serdev) {594 pm_runtime_get(&hu->serdev->dev);595 pm_runtime_mark_last_busy(&hu->serdev->dev);596 pm_runtime_put_autosuspend(&hu->serdev->dev);597 }598 599 return 0;600}601 602static int h5_enqueue(struct hci_uart *hu, struct sk_buff *skb)603{604 struct h5 *h5 = hu->priv;605 606 if (skb->len > 0xfff) {607 bt_dev_err(hu->hdev, "Packet too long (%u bytes)", skb->len);608 kfree_skb(skb);609 return 0;610 }611 612 if (h5->state != H5_ACTIVE) {613 bt_dev_err(hu->hdev, "Ignoring HCI data in non-active state");614 kfree_skb(skb);615 return 0;616 }617 618 switch (hci_skb_pkt_type(skb)) {619 case HCI_ACLDATA_PKT:620 case HCI_COMMAND_PKT:621 skb_queue_tail(&h5->rel, skb);622 break;623 624 case HCI_SCODATA_PKT:625 case HCI_ISODATA_PKT:626 skb_queue_tail(&h5->unrel, skb);627 break;628 629 default:630 bt_dev_err(hu->hdev, "Unknown packet type %u", hci_skb_pkt_type(skb));631 kfree_skb(skb);632 break;633 }634 635 if (hu->serdev) {636 pm_runtime_get_sync(&hu->serdev->dev);637 pm_runtime_mark_last_busy(&hu->serdev->dev);638 pm_runtime_put_autosuspend(&hu->serdev->dev);639 }640 641 return 0;642}643 644static void h5_slip_delim(struct sk_buff *skb)645{646 const char delim = SLIP_DELIMITER;647 648 skb_put_data(skb, &delim, 1);649}650 651static void h5_slip_one_byte(struct sk_buff *skb, u8 c)652{653 const char esc_delim[2] = { SLIP_ESC, SLIP_ESC_DELIM };654 const char esc_esc[2] = { SLIP_ESC, SLIP_ESC_ESC };655 656 switch (c) {657 case SLIP_DELIMITER:658 skb_put_data(skb, &esc_delim, 2);659 break;660 case SLIP_ESC:661 skb_put_data(skb, &esc_esc, 2);662 break;663 default:664 skb_put_data(skb, &c, 1);665 }666}667 668static bool valid_packet_type(u8 type)669{670 switch (type) {671 case HCI_ACLDATA_PKT:672 case HCI_COMMAND_PKT:673 case HCI_SCODATA_PKT:674 case HCI_ISODATA_PKT:675 case HCI_3WIRE_LINK_PKT:676 case HCI_3WIRE_ACK_PKT:677 return true;678 default:679 return false;680 }681}682 683static struct sk_buff *h5_prepare_pkt(struct hci_uart *hu, u8 pkt_type,684 const u8 *data, size_t len)685{686 struct h5 *h5 = hu->priv;687 struct sk_buff *nskb;688 u8 hdr[4];689 int i;690 691 if (!valid_packet_type(pkt_type)) {692 bt_dev_err(hu->hdev, "Unknown packet type %u", pkt_type);693 return NULL;694 }695 696 /*697 * Max len of packet: (original len + 4 (H5 hdr) + 2 (crc)) * 2698 * (because bytes 0xc0 and 0xdb are escaped, worst case is when699 * the packet is all made of 0xc0 and 0xdb) + 2 (0xc0700 * delimiters at start and end).701 */702 nskb = alloc_skb((len + 6) * 2 + 2, GFP_ATOMIC);703 if (!nskb)704 return NULL;705 706 hci_skb_pkt_type(nskb) = pkt_type;707 708 h5_slip_delim(nskb);709 710 hdr[0] = h5->tx_ack << 3;711 clear_bit(H5_TX_ACK_REQ, &h5->flags);712 713 /* Reliable packet? */714 if (pkt_type == HCI_ACLDATA_PKT || pkt_type == HCI_COMMAND_PKT) {715 hdr[0] |= 1 << 7;716 hdr[0] |= h5->tx_seq;717 h5->tx_seq = (h5->tx_seq + 1) % 8;718 }719 720 hdr[1] = pkt_type | ((len & 0x0f) << 4);721 hdr[2] = len >> 4;722 hdr[3] = ~((hdr[0] + hdr[1] + hdr[2]) & 0xff);723 724 BT_DBG("%s tx: seq %u ack %u crc %u rel %u type %u len %u",725 hu->hdev->name, H5_HDR_SEQ(hdr), H5_HDR_ACK(hdr),726 H5_HDR_CRC(hdr), H5_HDR_RELIABLE(hdr), H5_HDR_PKT_TYPE(hdr),727 H5_HDR_LEN(hdr));728 729 for (i = 0; i < 4; i++)730 h5_slip_one_byte(nskb, hdr[i]);731 732 for (i = 0; i < len; i++)733 h5_slip_one_byte(nskb, data[i]);734 735 h5_slip_delim(nskb);736 737 return nskb;738}739 740static struct sk_buff *h5_dequeue(struct hci_uart *hu)741{742 struct h5 *h5 = hu->priv;743 unsigned long flags;744 struct sk_buff *skb, *nskb;745 746 if (h5->sleep != H5_AWAKE) {747 const unsigned char wakeup_req[] = { 0x05, 0xfa };748 749 if (h5->sleep == H5_WAKING_UP)750 return NULL;751 752 h5->sleep = H5_WAKING_UP;753 BT_DBG("Sending wakeup request");754 755 mod_timer(&h5->timer, jiffies + HZ / 100);756 return h5_prepare_pkt(hu, HCI_3WIRE_LINK_PKT, wakeup_req, 2);757 }758 759 skb = skb_dequeue(&h5->unrel);760 if (skb) {761 nskb = h5_prepare_pkt(hu, hci_skb_pkt_type(skb),762 skb->data, skb->len);763 if (nskb) {764 kfree_skb(skb);765 return nskb;766 }767 768 skb_queue_head(&h5->unrel, skb);769 bt_dev_err(hu->hdev, "Could not dequeue pkt because alloc_skb failed");770 }771 772 spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING);773 774 if (h5->unack.qlen >= h5->tx_win)775 goto unlock;776 777 skb = skb_dequeue(&h5->rel);778 if (skb) {779 nskb = h5_prepare_pkt(hu, hci_skb_pkt_type(skb),780 skb->data, skb->len);781 if (nskb) {782 __skb_queue_tail(&h5->unack, skb);783 mod_timer(&h5->timer, jiffies + H5_ACK_TIMEOUT);784 spin_unlock_irqrestore(&h5->unack.lock, flags);785 return nskb;786 }787 788 skb_queue_head(&h5->rel, skb);789 bt_dev_err(hu->hdev, "Could not dequeue pkt because alloc_skb failed");790 }791 792unlock:793 spin_unlock_irqrestore(&h5->unack.lock, flags);794 795 if (test_bit(H5_TX_ACK_REQ, &h5->flags))796 return h5_prepare_pkt(hu, HCI_3WIRE_ACK_PKT, NULL, 0);797 798 return NULL;799}800 801static int h5_flush(struct hci_uart *hu)802{803 BT_DBG("hu %p", hu);804 return 0;805}806 807static const struct hci_uart_proto h5p = {808 .id = HCI_UART_3WIRE,809 .name = "Three-wire (H5)",810 .open = h5_open,811 .close = h5_close,812 .setup = h5_setup,813 .recv = h5_recv,814 .enqueue = h5_enqueue,815 .dequeue = h5_dequeue,816 .flush = h5_flush,817};818 819static int h5_serdev_probe(struct serdev_device *serdev)820{821 struct device *dev = &serdev->dev;822 struct h5 *h5;823 const struct h5_device_data *data;824 825 h5 = devm_kzalloc(dev, sizeof(*h5), GFP_KERNEL);826 if (!h5)827 return -ENOMEM;828 829 h5->hu = &h5->serdev_hu;830 h5->serdev_hu.serdev = serdev;831 serdev_device_set_drvdata(serdev, h5);832 833 if (has_acpi_companion(dev)) {834 const struct acpi_device_id *match;835 836 match = acpi_match_device(dev->driver->acpi_match_table, dev);837 if (!match)838 return -ENODEV;839 840 data = (const struct h5_device_data *)match->driver_data;841 h5->vnd = data->vnd;842 h5->id = (char *)match->id;843 844 if (h5->vnd->acpi_gpio_map)845 devm_acpi_dev_add_driver_gpios(dev,846 h5->vnd->acpi_gpio_map);847 } else {848 data = of_device_get_match_data(dev);849 if (!data)850 return -ENODEV;851 852 h5->vnd = data->vnd;853 }854 855 if (data->driver_info & H5_INFO_WAKEUP_DISABLE)856 set_bit(H5_WAKEUP_DISABLE, &h5->flags);857 858 h5->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);859 if (IS_ERR(h5->enable_gpio))860 return PTR_ERR(h5->enable_gpio);861 862 h5->device_wake_gpio = devm_gpiod_get_optional(dev, "device-wake",863 GPIOD_OUT_LOW);864 if (IS_ERR(h5->device_wake_gpio))865 return PTR_ERR(h5->device_wake_gpio);866 867 return hci_uart_register_device_priv(&h5->serdev_hu, &h5p,868 h5->vnd->sizeof_priv);869}870 871static void h5_serdev_remove(struct serdev_device *serdev)872{873 struct h5 *h5 = serdev_device_get_drvdata(serdev);874 875 hci_uart_unregister_device(&h5->serdev_hu);876}877 878static int __maybe_unused h5_serdev_suspend(struct device *dev)879{880 struct h5 *h5 = dev_get_drvdata(dev);881 int ret = 0;882 883 if (h5->vnd && h5->vnd->suspend)884 ret = h5->vnd->suspend(h5);885 886 return ret;887}888 889static int __maybe_unused h5_serdev_resume(struct device *dev)890{891 struct h5 *h5 = dev_get_drvdata(dev);892 int ret = 0;893 894 if (h5->vnd && h5->vnd->resume)895 ret = h5->vnd->resume(h5);896 897 return ret;898}899 900#ifdef CONFIG_BT_HCIUART_RTL901static int h5_btrtl_setup(struct h5 *h5)902{903 struct btrtl_device_info *btrtl_dev;904 struct sk_buff *skb;905 __le32 baudrate_data;906 u32 device_baudrate;907 unsigned int controller_baudrate;908 bool flow_control;909 int err;910 911 btrtl_dev = btrtl_initialize(h5->hu->hdev, h5->id);912 if (IS_ERR(btrtl_dev))913 return PTR_ERR(btrtl_dev);914 915 err = btrtl_get_uart_settings(h5->hu->hdev, btrtl_dev,916 &controller_baudrate, &device_baudrate,917 &flow_control);918 if (err)919 goto out_free;920 921 baudrate_data = cpu_to_le32(device_baudrate);922 skb = __hci_cmd_sync(h5->hu->hdev, 0xfc17, sizeof(baudrate_data),923 &baudrate_data, HCI_INIT_TIMEOUT);924 if (IS_ERR(skb)) {925 rtl_dev_err(h5->hu->hdev, "set baud rate command failed\n");926 err = PTR_ERR(skb);927 goto out_free;928 } else {929 kfree_skb(skb);930 }931 /* Give the device some time to set up the new baudrate. */932 usleep_range(10000, 20000);933 934 serdev_device_set_baudrate(h5->hu->serdev, controller_baudrate);935 serdev_device_set_flow_control(h5->hu->serdev, flow_control);936 937 if (flow_control)938 set_bit(H5_HW_FLOW_CONTROL, &h5->flags);939 940 err = btrtl_download_firmware(h5->hu->hdev, btrtl_dev);941 /* Give the device some time before the hci-core sends it a reset */942 usleep_range(10000, 20000);943 if (err)944 goto out_free;945 946 btrtl_set_quirks(h5->hu->hdev, btrtl_dev);947 948out_free:949 btrtl_free(btrtl_dev);950 951 return err;952}953 954static void h5_btrtl_open(struct h5 *h5)955{956 /*957 * Since h5_btrtl_resume() does a device_reprobe() the suspend handling958 * done by the hci_suspend_notifier is not necessary; it actually causes959 * delays and a bunch of errors to get logged, so disable it.960 */961 if (test_bit(H5_WAKEUP_DISABLE, &h5->flags))962 set_bit(HCI_UART_NO_SUSPEND_NOTIFIER, &h5->hu->flags);963 964 /* Devices always start with these fixed parameters */965 serdev_device_set_flow_control(h5->hu->serdev, false);966 serdev_device_set_parity(h5->hu->serdev, SERDEV_PARITY_EVEN);967 serdev_device_set_baudrate(h5->hu->serdev, 115200);968 969 if (!test_bit(H5_WAKEUP_DISABLE, &h5->flags)) {970 pm_runtime_set_active(&h5->hu->serdev->dev);971 pm_runtime_use_autosuspend(&h5->hu->serdev->dev);972 pm_runtime_set_autosuspend_delay(&h5->hu->serdev->dev,973 SUSPEND_TIMEOUT_MS);974 pm_runtime_enable(&h5->hu->serdev->dev);975 }976 977 /* The controller needs reset to startup */978 gpiod_set_value_cansleep(h5->enable_gpio, 0);979 gpiod_set_value_cansleep(h5->device_wake_gpio, 0);980 msleep(100);981 982 /* The controller needs up to 500ms to wakeup */983 gpiod_set_value_cansleep(h5->enable_gpio, 1);984 gpiod_set_value_cansleep(h5->device_wake_gpio, 1);985 msleep(500);986}987 988static void h5_btrtl_close(struct h5 *h5)989{990 if (!test_bit(H5_WAKEUP_DISABLE, &h5->flags))991 pm_runtime_disable(&h5->hu->serdev->dev);992 993 gpiod_set_value_cansleep(h5->device_wake_gpio, 0);994 gpiod_set_value_cansleep(h5->enable_gpio, 0);995}996 997/* Suspend/resume support. On many devices the RTL BT device loses power during998 * suspend/resume, causing it to lose its firmware and all state. So we simply999 * turn it off on suspend and reprobe on resume. This mirrors how RTL devices1000 * are handled in the USB driver, where the BTUSB_WAKEUP_DISABLE is used which1001 * also causes a reprobe on resume.1002 */1003static int h5_btrtl_suspend(struct h5 *h5)1004{1005 serdev_device_set_flow_control(h5->hu->serdev, false);1006 gpiod_set_value_cansleep(h5->device_wake_gpio, 0);1007 1008 if (test_bit(H5_WAKEUP_DISABLE, &h5->flags))1009 gpiod_set_value_cansleep(h5->enable_gpio, 0);1010 1011 return 0;1012}1013 1014struct h5_btrtl_reprobe {1015 struct device *dev;1016 struct work_struct work;1017};1018 1019static void h5_btrtl_reprobe_worker(struct work_struct *work)1020{1021 struct h5_btrtl_reprobe *reprobe =1022 container_of(work, struct h5_btrtl_reprobe, work);1023 int ret;1024 1025 ret = device_reprobe(reprobe->dev);1026 if (ret && ret != -EPROBE_DEFER)1027 dev_err(reprobe->dev, "Reprobe error %d\n", ret);1028 1029 put_device(reprobe->dev);1030 kfree(reprobe);1031 module_put(THIS_MODULE);1032}1033 1034static int h5_btrtl_resume(struct h5 *h5)1035{1036 if (test_bit(H5_WAKEUP_DISABLE, &h5->flags)) {1037 struct h5_btrtl_reprobe *reprobe;1038 1039 reprobe = kzalloc(sizeof(*reprobe), GFP_KERNEL);1040 if (!reprobe)1041 return -ENOMEM;1042 1043 __module_get(THIS_MODULE);1044 1045 INIT_WORK(&reprobe->work, h5_btrtl_reprobe_worker);1046 reprobe->dev = get_device(&h5->hu->serdev->dev);1047 queue_work(system_long_wq, &reprobe->work);1048 } else {1049 gpiod_set_value_cansleep(h5->device_wake_gpio, 1);1050 1051 if (test_bit(H5_HW_FLOW_CONTROL, &h5->flags))1052 serdev_device_set_flow_control(h5->hu->serdev, true);1053 }1054 1055 return 0;1056}1057 1058static const struct acpi_gpio_params btrtl_device_wake_gpios = { 0, 0, false };1059static const struct acpi_gpio_params btrtl_enable_gpios = { 1, 0, false };1060static const struct acpi_gpio_params btrtl_host_wake_gpios = { 2, 0, false };1061static const struct acpi_gpio_mapping acpi_btrtl_gpios[] = {1062 { "device-wake-gpios", &btrtl_device_wake_gpios, 1 },1063 { "enable-gpios", &btrtl_enable_gpios, 1 },1064 { "host-wake-gpios", &btrtl_host_wake_gpios, 1 },1065 {},1066};1067 1068static struct h5_vnd rtl_vnd = {1069 .setup = h5_btrtl_setup,1070 .open = h5_btrtl_open,1071 .close = h5_btrtl_close,1072 .suspend = h5_btrtl_suspend,1073 .resume = h5_btrtl_resume,1074 .acpi_gpio_map = acpi_btrtl_gpios,1075 .sizeof_priv = sizeof(struct btrealtek_data),1076};1077 1078static const struct h5_device_data h5_data_rtl8822cs = {1079 .vnd = &rtl_vnd,1080};1081 1082static const struct h5_device_data h5_data_rtl8723bs = {1083 .driver_info = H5_INFO_WAKEUP_DISABLE,1084 .vnd = &rtl_vnd,1085};1086#endif1087 1088#ifdef CONFIG_ACPI1089static const struct acpi_device_id h5_acpi_match[] = {1090#ifdef CONFIG_BT_HCIUART_RTL1091 { "OBDA0623", (kernel_ulong_t)&h5_data_rtl8723bs },1092 { "OBDA8723", (kernel_ulong_t)&h5_data_rtl8723bs },1093#endif1094 { },1095};1096MODULE_DEVICE_TABLE(acpi, h5_acpi_match);1097#endif1098 1099static const struct dev_pm_ops h5_serdev_pm_ops = {1100 SET_SYSTEM_SLEEP_PM_OPS(h5_serdev_suspend, h5_serdev_resume)1101 SET_RUNTIME_PM_OPS(h5_serdev_suspend, h5_serdev_resume, NULL)1102};1103 1104static const struct of_device_id rtl_bluetooth_of_match[] = {1105#ifdef CONFIG_BT_HCIUART_RTL1106 { .compatible = "realtek,rtl8822cs-bt",1107 .data = (const void *)&h5_data_rtl8822cs },1108 { .compatible = "realtek,rtl8723bs-bt",1109 .data = (const void *)&h5_data_rtl8723bs },1110 { .compatible = "realtek,rtl8723cs-bt",1111 .data = (const void *)&h5_data_rtl8723bs },1112 { .compatible = "realtek,rtl8723ds-bt",1113 .data = (const void *)&h5_data_rtl8723bs },1114#endif1115 { },1116};1117MODULE_DEVICE_TABLE(of, rtl_bluetooth_of_match);1118 1119static struct serdev_device_driver h5_serdev_driver = {1120 .probe = h5_serdev_probe,1121 .remove = h5_serdev_remove,1122 .driver = {1123 .name = "hci_uart_h5",1124 .acpi_match_table = ACPI_PTR(h5_acpi_match),1125 .pm = &h5_serdev_pm_ops,1126 .of_match_table = rtl_bluetooth_of_match,1127 },1128};1129 1130int __init h5_init(void)1131{1132 serdev_device_driver_register(&h5_serdev_driver);1133 return hci_uart_register_proto(&h5p);1134}1135 1136int __exit h5_deinit(void)1137{1138 serdev_device_driver_unregister(&h5_serdev_driver);1139 return hci_uart_unregister_proto(&h5p);1140}1141