The cmd_sco command is associated with the Bluetooth subsystem in Linux kernel. It is part of the Bluetooth HCI (Host Controller Interface) commands used for managing Synchronous Connection-Oriented (SCO) links, which are typically used for audio communication like voice calls over Bluetooth. Here are detailed insights into cmd_sco:
cmd_sco can be used to initiate a SCO link between two Bluetooth devices, typically a master and a slave. This is crucial for applications requiring real-time audio transmission with low latency, such as voice calls or audio streaming[1].cmd_sco remains relevant for devices supporting older Bluetooth versions or for specific applications where SCO's simplicity is advantageous[4].In the Linux kernel, cmd_sco is part of the HCI commands that can be sent to the Bluetooth controller via the HCI interface. It's often used in conjunction with other HCI commands to manage connections, handle audio data, and ensure proper setup of Bluetooth audio streams:
struct hci_conn *hci_sco_connect(struct hci_dev *hdev, bdaddr_t *bdaddr, uint16_t pkt_type, uint8_t sec_level, uint8_t role_switch)
{
// Implementation details for SCO connection setup
}