Bluetooth: vhci: Add support for setting msft_opcode and aosp_capable

This adds a debugfs entries to set msft_opcode and aosp_capable enabling
vhci to emulate controllers with MSFT/AOSP extension support.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/drivers/bluetooth/hci_vhci.c b/drivers/bluetooth/hci_vhci.c
index 56c6b22..9cb7c8f 100644 (file)
--- a/drivers/bluetooth/hci_vhci.c
+++ b/drivers/bluetooth/hci_vhci.c
@@ -42,6 +42,8 @@ struct vhci_data {
 
        bool suspended;
        bool wakeup;
+       __u16 msft_opcode;
+       bool aosp_capable;
 };
 
 static int vhci_open_dev(struct hci_dev *hdev)
@@ -194,6 +196,88 @@ static const struct file_operations force_wakeup_fops = {
        .llseek         = default_llseek,
 };
 
+static int msft_opcode_set(void *data, u64 val)
+{
+       struct vhci_data *vhci = data;
+
+       if (val > 0xffff || (val & 0xffff >> 10) != 0x3f)
+               return -EINVAL;
+
+       if (vhci->msft_opcode)
+               return -EALREADY;
+
+       vhci->msft_opcode = val;
+
+       return 0;
+}
+
+static int msft_opcode_get(void *data, u64 *val)
+{
+       struct vhci_data *vhci = data;
+
+       *val = vhci->msft_opcode;
+
+       return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(msft_opcode_fops, msft_opcode_get, msft_opcode_set,
+                        "%llu\n");
+
+static ssize_t aosp_capable_read(struct file *file, char __user *user_buf,
+                                size_t count, loff_t *ppos)
+{
+       struct vhci_data *vhci = file->private_data;
+       char buf[3];
+
+       buf[0] = vhci->aosp_capable ? 'Y' : 'N';
+       buf[1] = '\n';
+       buf[2] = '\0';
+       return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
+}
+
+static ssize_t aosp_capable_write(struct file *file,
+                                 const char __user *user_buf, size_t count,
+                                 loff_t *ppos)
+{
+       struct vhci_data *vhci = file->private_data;
+       bool enable;
+       int err;
+
+       err = kstrtobool_from_user(user_buf, count, &enable);
+       if (err)
+               return err;
+
+       if (!enable)
+               return -EINVAL;
+
+       if (vhci->aosp_capable)
+               return -EALREADY;
+
+       vhci->aosp_capable = enable;
+
+       return count;
+}
+
+static const struct file_operations aosp_capable_fops = {
+       .open           = simple_open,
+       .read           = aosp_capable_read,
+       .write          = aosp_capable_write,
+       .llseek         = default_llseek,
+};
+
+static int vhci_setup(struct hci_dev *hdev)
+{
+       struct vhci_data *vhci = hci_get_drvdata(hdev);
+
+       if (vhci->msft_opcode)
+               hci_set_msft_opcode(hdev, vhci->msft_opcode);
+
+       if (vhci->aosp_capable)
+               hci_set_aosp_capable(hdev);
+
+       return 0;
+}
+
 static int __vhci_create_device(struct vhci_data *data, __u8 opcode)
 {
        struct hci_dev *hdev;
@@ -236,6 +320,8 @@ static int __vhci_create_device(struct vhci_data *data, __u8 opcode)
        hdev->get_data_path_id = vhci_get_data_path_id;
        hdev->get_codec_config_data = vhci_get_codec_config_data;
        hdev->wakeup = vhci_wakeup;
+       hdev->setup = vhci_setup;
+       set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
 
        /* bit 6 is for external configuration */
        if (opcode & 0x40)
@@ -259,6 +345,14 @@ static int __vhci_create_device(struct vhci_data *data, __u8 opcode)
        debugfs_create_file("force_wakeup", 0644, hdev->debugfs, data,
                            &force_wakeup_fops);
 
+       if (IS_ENABLED(CONFIG_BT_MSFTEXT))
+               debugfs_create_file("msft_opcode", 0644, hdev->debugfs, data,
+                                   &msft_opcode_fops);
+
+       if (IS_ENABLED(CONFIG_BT_AOSPEXT))
+               debugfs_create_file("aosp_capable", 0644, hdev->debugfs, data,
+                                   &aosp_capable_fops);
+
        hci_skb_pkt_type(skb) = HCI_VENDOR_PKT;
 
        skb_put_u8(skb, 0xff);