Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *  Bluetooth virtual HCI driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *  Copyright (C) 2000-2001  Qualcomm Incorporated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *  Copyright (C) 2002-2003  Maxim Krasnyansky <maxk@qualcomm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *  Copyright (C) 2004-2006  Marcel Holtmann <marcel@holtmann.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <asm/unaligned.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/poll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/miscdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <net/bluetooth/bluetooth.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <net/bluetooth/hci_core.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #define VERSION "1.5"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) static bool amp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) struct vhci_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	struct hci_dev *hdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	wait_queue_head_t read_wait;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	struct sk_buff_head readq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	struct mutex open_mutex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	struct delayed_work open_timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) static int vhci_open_dev(struct hci_dev *hdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) static int vhci_close_dev(struct hci_dev *hdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	struct vhci_data *data = hci_get_drvdata(hdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	skb_queue_purge(&data->readq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) static int vhci_flush(struct hci_dev *hdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	struct vhci_data *data = hci_get_drvdata(hdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	skb_queue_purge(&data->readq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) static int vhci_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	struct vhci_data *data = hci_get_drvdata(hdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	skb_queue_tail(&data->readq, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	wake_up_interruptible(&data->read_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) static int __vhci_create_device(struct vhci_data *data, __u8 opcode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	struct hci_dev *hdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	__u8 dev_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	if (data->hdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		return -EBADFD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	/* bits 0-1 are dev_type (Primary or AMP) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	dev_type = opcode & 0x03;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	if (dev_type != HCI_PRIMARY && dev_type != HCI_AMP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	/* bits 2-5 are reserved (must be zero) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	if (opcode & 0x3c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	skb = bt_skb_alloc(4, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	hdev = hci_alloc_dev();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	if (!hdev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	data->hdev = hdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	hdev->bus = HCI_VIRTUAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	hdev->dev_type = dev_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	hci_set_drvdata(hdev, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	hdev->open  = vhci_open_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	hdev->close = vhci_close_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	hdev->flush = vhci_flush;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	hdev->send  = vhci_send_frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	/* bit 6 is for external configuration */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	if (opcode & 0x40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	/* bit 7 is for raw device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	if (opcode & 0x80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	set_bit(HCI_QUIRK_VALID_LE_STATES, &hdev->quirks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	if (hci_register_dev(hdev) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		BT_ERR("Can't register HCI device");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		hci_free_dev(hdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		data->hdev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	hci_skb_pkt_type(skb) = HCI_VENDOR_PKT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	skb_put_u8(skb, 0xff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	skb_put_u8(skb, opcode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	put_unaligned_le16(hdev->id, skb_put(skb, 2));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	skb_queue_tail(&data->readq, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	wake_up_interruptible(&data->read_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) static int vhci_create_device(struct vhci_data *data, __u8 opcode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	mutex_lock(&data->open_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	err = __vhci_create_device(data, opcode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	mutex_unlock(&data->open_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) static inline ssize_t vhci_get_user(struct vhci_data *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 				    struct iov_iter *from)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	size_t len = iov_iter_count(from);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	__u8 pkt_type, opcode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	if (len < 2 || len > HCI_MAX_FRAME_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	skb = bt_skb_alloc(len, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	if (!copy_from_iter_full(skb_put(skb, len), len, from)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	pkt_type = *((__u8 *) skb->data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	skb_pull(skb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	switch (pkt_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	case HCI_EVENT_PKT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	case HCI_ACLDATA_PKT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	case HCI_SCODATA_PKT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	case HCI_ISODATA_PKT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		if (!data->hdev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 			kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 			return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		hci_skb_pkt_type(skb) = pkt_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		ret = hci_recv_frame(data->hdev, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	case HCI_VENDOR_PKT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		cancel_delayed_work_sync(&data->open_timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		opcode = *((__u8 *) skb->data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		skb_pull(skb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		if (skb->len > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 			kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		ret = vhci_create_device(data, opcode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	return (ret < 0) ? ret : len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) static inline ssize_t vhci_put_user(struct vhci_data *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 				    struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 				    char __user *buf, int count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	char __user *ptr = buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	len = min_t(unsigned int, skb->len, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	if (copy_to_user(ptr, skb->data, len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	if (!data->hdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	data->hdev->stat.byte_tx += len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	switch (hci_skb_pkt_type(skb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	case HCI_COMMAND_PKT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		data->hdev->stat.cmd_tx++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	case HCI_ACLDATA_PKT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 		data->hdev->stat.acl_tx++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	case HCI_SCODATA_PKT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		data->hdev->stat.sco_tx++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) static ssize_t vhci_read(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 			 char __user *buf, size_t count, loff_t *pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	struct vhci_data *data = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	ssize_t ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	while (count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		skb = skb_dequeue(&data->readq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		if (skb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 			ret = vhci_put_user(data, skb, buf, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 			if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 				skb_queue_head(&data->readq, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 			else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 				kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		if (file->f_flags & O_NONBLOCK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 			ret = -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		ret = wait_event_interruptible(data->read_wait,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 					       !skb_queue_empty(&data->readq));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) static ssize_t vhci_write(struct kiocb *iocb, struct iov_iter *from)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	struct file *file = iocb->ki_filp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	struct vhci_data *data = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	return vhci_get_user(data, from);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) static __poll_t vhci_poll(struct file *file, poll_table *wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	struct vhci_data *data = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	poll_wait(file, &data->read_wait, wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	if (!skb_queue_empty(&data->readq))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 		return EPOLLIN | EPOLLRDNORM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	return EPOLLOUT | EPOLLWRNORM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) static void vhci_open_timeout(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	struct vhci_data *data = container_of(work, struct vhci_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 					      open_timeout.work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	vhci_create_device(data, amp ? HCI_AMP : HCI_PRIMARY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) static int vhci_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	struct vhci_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	if (!data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	skb_queue_head_init(&data->readq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	init_waitqueue_head(&data->read_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	mutex_init(&data->open_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	INIT_DELAYED_WORK(&data->open_timeout, vhci_open_timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	file->private_data = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	nonseekable_open(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	schedule_delayed_work(&data->open_timeout, msecs_to_jiffies(1000));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) static int vhci_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	struct vhci_data *data = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	struct hci_dev *hdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	cancel_delayed_work_sync(&data->open_timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	hdev = data->hdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	if (hdev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		hci_unregister_dev(hdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 		hci_free_dev(hdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	skb_queue_purge(&data->readq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	file->private_data = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	kfree(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) static const struct file_operations vhci_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	.owner		= THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	.read		= vhci_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	.write_iter	= vhci_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	.poll		= vhci_poll,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	.open		= vhci_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	.release	= vhci_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	.llseek		= no_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) static struct miscdevice vhci_miscdev = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	.name	= "vhci",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	.fops	= &vhci_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	.minor	= VHCI_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) module_misc_device(vhci_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) module_param(amp, bool, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) MODULE_PARM_DESC(amp, "Create AMP controller device");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) MODULE_VERSION(VERSION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) MODULE_ALIAS("devname:vhci");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) MODULE_ALIAS_MISCDEV(VHCI_MINOR);