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Bluetooth: btusb: add sysfs attribute to control USB alt setting

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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@chromium.org>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Ying Hsu 2024-12-13 12:04:22 +08:00 • committed by Luiz Augusto von Dentz
parent a6587d7ed2
commit b16b327edb
1 changed files with 33 additions and 1 deletions
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34
drivers/bluetooth/btusb.c
View file

@ -3647,6 +3647,32 @@ static const struct file_operations force_poll_sync_fops = {
.llseek = default_llseek, .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, static int btusb_probe(struct usb_interface *intf,
const struct usb_device_id *id) const struct usb_device_id *id)
{ {
@ -4010,6 +4036,10 @@ static int btusb_probe(struct usb_interface *intf,
data->isoc, data); data->isoc, data);
if (err < 0) if (err < 0)
goto out_free_dev; 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) { if (IS_ENABLED(CONFIG_BT_HCIBTUSB_BCM) && data->diag) {
@ -4056,8 +4086,10 @@ static void btusb_disconnect(struct usb_interface *intf)
hdev = data->hdev; hdev = data->hdev;
usb_set_intfdata(data->intf, NULL); 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); usb_set_intfdata(data->isoc, NULL);
}
if (data->diag) if (data->diag)
usb_set_intfdata(data->diag, NULL); usb_set_intfdata(data->diag, NULL);