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.
Signed-off-by: Ying Hsu <yinghsu@xxxxxxxxxxxx>
---
This commit has been tested on a chromebook with AX211.
Changes in v2:
- Add check for the existence of a valid USB interface 1.
drivers/bluetooth/btusb.c | 34 +++++++++++++++++++++++++++++++++-
1 file changed, 33 insertions(+), 1 deletion(-)
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 279fe6c115fa..7d7cfcd07aef 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)
{
@@ -4008,6 +4034,10 @@ static int btusb_probe(struct usb_interface *intf,
data->isoc, data);
if (err < 0)
goto out_free_dev;
+
+ err = device_create_file(&intf->dev, &dev_attr_isoc_alt);
+ if (err)
+ goto out_free_dev;
}
if (IS_ENABLED(CONFIG_BT_HCIBTUSB_BCM) && data->diag) {
@@ -4054,8 +4084,10 @@ static void btusb_disconnect(struct usb_interface *intf)
hdev = data->hdev;
usb_set_intfdata(data->intf, NULL);
- if (data->isoc)
+ if (data->isoc) {
+ device_remove_file(&intf->dev, &dev_attr_isoc_alt);
usb_set_intfdata(data->isoc, NULL);
+ }
if (data->diag)
usb_set_intfdata(data->diag, NULL);
--
2.47.1.613.gc27f4b7a9f-goog
