When a Bluetooth raw socket is open, the HCI event related to SCO
connection changes are not dispatched to the hci_event module, and
the underlying Bluetooth controller's USB Interface 1 will not be
updated accordingly.
This patch adds `isoc_alt` sysfs attribute, allowing user space
to update the alternate setting of the USB interface alternate
setting as needed.
BUG=b:382526205
TEST=read and write /sys/class/bluetooth/hci0/isoc_alt
Series-to: linux-bluetooth@xxxxxxxxxxxxxxx
Series-to: luiz.dentz@xxxxxxxxx
Series-cc: chromeos-bluetooth-upstreaming@xxxxxxxxxxxx
Commit-notes:
This commit has been tested on a chromebook with AX211.
END
Change-Id: Ifc708cc471a8834b344c26fce1ce2fe3e5992cad
Signed-off-by: Ying Hsu <yinghsu@xxxxxxxxxxxx>
---
drivers/bluetooth/btusb.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 279fe6c115fa..e8446f3e026e 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -3645,6 +3645,32 @@ static const struct file_operations force_poll_sync_fops = {
.llseek = default_llseek,
};
+static ssize_t isoc_alt_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct btusb_data *data = dev_get_drvdata(dev);
+
+ return sysfs_emit(buf, "%d\n", data->isoc_altsetting);
+}
+
+static ssize_t isoc_alt_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct btusb_data *data = dev_get_drvdata(dev);
+ int alt;
+ int ret;
+
+ if (kstrtoint(buf, 10, &alt))
+ return -EINVAL;
+
+ ret = btusb_switch_alt_setting(data->hdev, alt);
+ return ret < 0 ? ret : count;
+}
+
+static DEVICE_ATTR_RW(isoc_alt);
+
static int btusb_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
@@ -4032,6 +4058,10 @@ static int btusb_probe(struct usb_interface *intf,
debugfs_create_file("force_poll_sync", 0644, hdev->debugfs, data,
&force_poll_sync_fops);
+ err = device_create_file(&intf->dev, &dev_attr_isoc_alt);
+ if (err)
+ goto out_free_dev;
+
return 0;
out_free_dev:
@@ -4052,6 +4082,8 @@ static void btusb_disconnect(struct usb_interface *intf)
return;
hdev = data->hdev;
+ device_remove_file(&intf->dev, &dev_attr_isoc_alt);
+
usb_set_intfdata(data->intf, NULL);
if (data->isoc)
--
2.47.0.338.g60cca15819-goog
