1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * Bluetooth HCI UART driver for Intel/AG6xx devices
6 * Copyright (C) 2016 Intel Corporation
9 #include <linux/kernel.h>
10 #include <linux/errno.h>
11 #include <linux/skbuff.h>
12 #include <linux/firmware.h>
13 #include <linux/module.h>
14 #include <linux/tty.h>
16 #include <net/bluetooth/bluetooth.h>
17 #include <net/bluetooth/hci_core.h>
23 struct sk_buff *rx_skb;
24 struct sk_buff_head txq;
33 static int ag6xx_open(struct hci_uart *hu)
35 struct ag6xx_data *ag6xx;
39 ag6xx = kzalloc(sizeof(*ag6xx), GFP_KERNEL);
43 skb_queue_head_init(&ag6xx->txq);
49 static int ag6xx_close(struct hci_uart *hu)
51 struct ag6xx_data *ag6xx = hu->priv;
55 skb_queue_purge(&ag6xx->txq);
56 kfree_skb(ag6xx->rx_skb);
63 static int ag6xx_flush(struct hci_uart *hu)
65 struct ag6xx_data *ag6xx = hu->priv;
69 skb_queue_purge(&ag6xx->txq);
73 static struct sk_buff *ag6xx_dequeue(struct hci_uart *hu)
75 struct ag6xx_data *ag6xx = hu->priv;
78 skb = skb_dequeue(&ag6xx->txq);
82 /* Prepend skb with frame type */
83 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
87 static int ag6xx_enqueue(struct hci_uart *hu, struct sk_buff *skb)
89 struct ag6xx_data *ag6xx = hu->priv;
91 skb_queue_tail(&ag6xx->txq, skb);
95 static const struct h4_recv_pkt ag6xx_recv_pkts[] = {
96 { H4_RECV_ACL, .recv = hci_recv_frame },
97 { H4_RECV_SCO, .recv = hci_recv_frame },
98 { H4_RECV_EVENT, .recv = hci_recv_frame },
101 static int ag6xx_recv(struct hci_uart *hu, const void *data, int count)
103 struct ag6xx_data *ag6xx = hu->priv;
105 if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
108 ag6xx->rx_skb = h4_recv_buf(hu->hdev, ag6xx->rx_skb, data, count,
110 ARRAY_SIZE(ag6xx_recv_pkts));
111 if (IS_ERR(ag6xx->rx_skb)) {
112 int err = PTR_ERR(ag6xx->rx_skb);
113 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
114 ag6xx->rx_skb = NULL;
121 static int intel_mem_write(struct hci_dev *hdev, u32 addr, u32 plen,
124 /* Can write a maximum of 247 bytes per HCI command.
125 * HCI cmd Header (3), Intel mem write header (6), data (247).
129 u8 cmd_param[253], fragment_len = (plen > 247) ? 247 : plen;
130 __le32 leaddr = cpu_to_le32(addr);
132 memcpy(cmd_param, &leaddr, 4);
134 cmd_param[5] = fragment_len;
135 memcpy(cmd_param + 6, data, fragment_len);
137 skb = __hci_cmd_sync(hdev, 0xfc8e, fragment_len + 6, cmd_param,
143 plen -= fragment_len;
144 data += fragment_len;
145 addr += fragment_len;
151 static int ag6xx_setup(struct hci_uart *hu)
153 struct hci_dev *hdev = hu->hdev;
155 struct intel_version ver;
156 const struct firmware *fw;
159 bool patched = false;
162 hu->hdev->set_diag = btintel_set_diag;
163 hu->hdev->set_bdaddr = btintel_set_bdaddr;
165 err = btintel_enter_mfg(hdev);
169 err = btintel_read_version(hdev, &ver);
173 btintel_version_info(hdev, &ver);
175 /* The hardware platform number has a fixed value of 0x37 and
176 * for now only accept this single value.
178 if (ver.hw_platform != 0x37) {
179 bt_dev_err(hdev, "Unsupported Intel hardware platform: 0x%X",
184 /* Only the hardware variant iBT 2.1 (AG6XX) is supported by this
185 * firmware setup method.
187 if (ver.hw_variant != 0x0a) {
188 bt_dev_err(hdev, "Unsupported Intel hardware variant: 0x%x",
193 snprintf(fwname, sizeof(fwname), "intel/ibt-hw-%x.%x.bddata",
194 ver.hw_platform, ver.hw_variant);
196 err = request_firmware(&fw, fwname, &hdev->dev);
198 bt_dev_err(hdev, "Failed to open Intel bddata file: %s (%d)",
203 bt_dev_info(hdev, "Applying bddata (%s)", fwname);
205 skb = __hci_cmd_sync_ev(hdev, 0xfc2f, fw->size, fw->data,
206 HCI_EV_CMD_STATUS, HCI_CMD_TIMEOUT);
208 bt_dev_err(hdev, "Applying bddata failed (%ld)", PTR_ERR(skb));
209 release_firmware(fw);
214 release_firmware(fw);
217 /* If there is no applied patch, fw_patch_num is always 0x00. In other
218 * cases, current firmware is already patched. No need to patch it.
220 if (ver.fw_patch_num) {
221 bt_dev_info(hdev, "Device is already patched. patch num: %02x",
227 snprintf(fwname, sizeof(fwname),
228 "intel/ibt-hw-%x.%x.%x-fw-%x.%x.%x.%x.%x.pbn",
229 ver.hw_platform, ver.hw_variant, ver.hw_revision,
230 ver.fw_variant, ver.fw_revision, ver.fw_build_num,
231 ver.fw_build_ww, ver.fw_build_yy);
233 err = request_firmware(&fw, fwname, &hdev->dev);
235 bt_dev_err(hdev, "Failed to open Intel patch file: %s(%d)",
241 bt_dev_info(hdev, "Patching firmware file (%s)", fwname);
243 /* PBN patch file contains a list of binary patches to be applied on top
244 * of the embedded firmware. Each patch entry header contains the target
245 * address and patch size.
248 * | addr(le) | patch_len(le) | patch_data |
249 * | 4 Bytes | 4 Bytes | n Bytes |
251 * PBN file is terminated by a patch entry whose address is 0xffffffff.
253 while (fw->size > fw_ptr - fw->data) {
254 struct pbn_entry *pbn = (void *)fw_ptr;
257 if (pbn->addr == 0xffffffff) {
258 bt_dev_info(hdev, "Patching complete");
263 addr = le32_to_cpu(pbn->addr);
264 plen = le32_to_cpu(pbn->plen);
266 if (fw->data + fw->size <= pbn->data + plen) {
267 bt_dev_info(hdev, "Invalid patch len (%d)", plen);
271 bt_dev_info(hdev, "Patching %td/%zu", (fw_ptr - fw->data),
274 err = intel_mem_write(hdev, addr, plen, pbn->data);
276 bt_dev_err(hdev, "Patching failed");
280 fw_ptr = pbn->data + plen;
283 release_firmware(fw);
286 /* Exit manufacturing mode and reset */
287 err = btintel_exit_mfg(hdev, true, patched);
291 /* Set the event mask for Intel specific vendor events. This enables
292 * a few extra events that are useful during general operation.
294 btintel_set_event_mask_mfg(hdev, false);
296 btintel_check_bdaddr(hdev);
300 static const struct hci_uart_proto ag6xx_proto = {
301 .id = HCI_UART_AG6XX,
305 .close = ag6xx_close,
306 .flush = ag6xx_flush,
307 .setup = ag6xx_setup,
309 .enqueue = ag6xx_enqueue,
310 .dequeue = ag6xx_dequeue,
313 int __init ag6xx_init(void)
315 return hci_uart_register_proto(&ag6xx_proto);
318 int __exit ag6xx_deinit(void)
320 return hci_uart_unregister_proto(&ag6xx_proto);