hci_drv.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2025 Google Corporation
  4 */
  5
  6#include <linux/skbuff.h>
  7#include <linux/types.h>
  8
  9#include <net/bluetooth/bluetooth.h>
 10#include <net/bluetooth/hci.h>
 11#include <net/bluetooth/hci_core.h>
 12#include <net/bluetooth/hci_drv.h>
 13
 14int hci_drv_cmd_status(struct hci_dev *hdev, u16 cmd, u8 status)
 15{
 16	struct hci_drv_ev_hdr *hdr;
 17	struct hci_drv_ev_cmd_status *ev;
 18	struct sk_buff *skb;
 19
 20	skb = bt_skb_alloc(sizeof(*hdr) + sizeof(*ev), GFP_KERNEL);
 21	if (!skb)
 22		return -ENOMEM;
 23
 24	hdr = skb_put(skb, sizeof(*hdr));
 25	hdr->opcode = __cpu_to_le16(HCI_DRV_EV_CMD_STATUS);
 26	hdr->len = __cpu_to_le16(sizeof(*ev));
 27
 28	ev = skb_put(skb, sizeof(*ev));
 29	ev->opcode = __cpu_to_le16(cmd);
 30	ev->status = status;
 31
 32	hci_skb_pkt_type(skb) = HCI_DRV_PKT;
 33
 34	return hci_recv_frame(hdev, skb);
 35}
 36EXPORT_SYMBOL(hci_drv_cmd_status);
 37
 38int hci_drv_cmd_complete(struct hci_dev *hdev, u16 cmd, u8 status, void *rp,
 39			 size_t rp_len)
 40{
 41	struct hci_drv_ev_hdr *hdr;
 42	struct hci_drv_ev_cmd_complete *ev;
 43	struct sk_buff *skb;
 44
 45	skb = bt_skb_alloc(sizeof(*hdr) + sizeof(*ev) + rp_len, GFP_KERNEL);
 46	if (!skb)
 47		return -ENOMEM;
 48
 49	hdr = skb_put(skb, sizeof(*hdr));
 50	hdr->opcode = __cpu_to_le16(HCI_DRV_EV_CMD_COMPLETE);
 51	hdr->len = __cpu_to_le16(sizeof(*ev) + rp_len);
 52
 53	ev = skb_put(skb, sizeof(*ev));
 54	ev->opcode = __cpu_to_le16(cmd);
 55	ev->status = status;
 56
 57	skb_put_data(skb, rp, rp_len);
 58
 59	hci_skb_pkt_type(skb) = HCI_DRV_PKT;
 60
 61	return hci_recv_frame(hdev, skb);
 62}
 63EXPORT_SYMBOL(hci_drv_cmd_complete);
 64
 65int hci_drv_process_cmd(struct hci_dev *hdev, struct sk_buff *skb)
 66{
 67	struct hci_drv_cmd_hdr *hdr;
 68	const struct hci_drv_handler *handler = NULL;
 69	u16 opcode, len, ogf, ocf;
 70
 71	hdr = skb_pull_data(skb, sizeof(*hdr));
 72	if (!hdr)
 73		return -EILSEQ;
 74
 75	opcode = __le16_to_cpu(hdr->opcode);
 76	len = __le16_to_cpu(hdr->len);
 77	if (len != skb->len)
 78		return -EILSEQ;
 79
 80	ogf = hci_opcode_ogf(opcode);
 81	ocf = hci_opcode_ocf(opcode);
 82
 83	if (!hdev->hci_drv)
 84		return hci_drv_cmd_status(hdev, opcode,
 85					  HCI_DRV_STATUS_UNKNOWN_COMMAND);
 86
 87	if (ogf != HCI_DRV_OGF_DRIVER_SPECIFIC) {
 88		if (opcode < hdev->hci_drv->common_handler_count)
 89			handler = &hdev->hci_drv->common_handlers[opcode];
 90	} else {
 91		if (ocf < hdev->hci_drv->specific_handler_count)
 92			handler = &hdev->hci_drv->specific_handlers[ocf];
 93	}
 94
 95	if (!handler || !handler->func)
 96		return hci_drv_cmd_status(hdev, opcode,
 97					  HCI_DRV_STATUS_UNKNOWN_COMMAND);
 98
 99	if (len != handler->data_len)
100		return hci_drv_cmd_status(hdev, opcode,
101					  HCI_DRV_STATUS_INVALID_PARAMETERS);
102
103	return handler->func(hdev, skb->data, len);
104}
105EXPORT_SYMBOL(hci_drv_process_cmd);