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Miller" , Jakub Kicinski , Johan Hedberg , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH v1 1/2] Bluetooth: btusb: define HCI packet sizes of USB Alts Date: Thu, 13 Aug 2020 16:41:28 +0800 Message-Id: <20200813164059.v1.1.I56de28ec171134cb9f97062e2c304a72822ca38b@changeid> X-Mailer: git-send-email 2.28.0.236.gb10cc79966-goog In-Reply-To: <20200813084129.332730-1-josephsih@chromium.org> References: <20200813084129.332730-1-josephsih@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org It is desirable to define the HCI packet payload sizes of USB alternate settings so that they can be exposed to user space. Reviewed-by: Alain Michaud Reviewed-by: Abhishek Pandit-Subedi Signed-off-by: Joseph Hwang --- drivers/bluetooth/btusb.c | 43 ++++++++++++++++++++++++-------- include/net/bluetooth/hci_core.h | 1 + 2 files changed, 33 insertions(+), 11 deletions(-) diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index 8d2608ddfd0875..df7cadf6385868 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -459,6 +459,22 @@ static const struct dmi_system_id btusb_needs_reset_resume_table[] = { #define BTUSB_WAKEUP_DISABLE 14 #define BTUSB_USE_ALT1_FOR_WBS 15 +/* Per core spec 5, vol 4, part B, table 2.1, + * list the hci packet payload sizes for various ALT settings. + * This is used to set the packet length for the wideband speech. + * If a controller does not probe its usb alt setting, the default + * value will be 0. Any clients at upper layers should interpret it + * as a default value and set a proper packet length accordingly. + * + * To calculate the HCI packet payload length: + * for alternate settings 1 - 5: + * hci_packet_size = suggested_max_packet_size * 3 (packets) - + * 3 (HCI header octets) + * for alternate setting 6: + * hci_packet_size = suggested_max_packet_size - 3 (HCI header octets) + */ +static const int hci_packet_size_usb_alt[] = { 0, 24, 48, 72, 96, 144, 60 }; + struct btusb_data { struct hci_dev *hdev; struct usb_device *udev; @@ -3958,6 +3974,15 @@ static int btusb_probe(struct usb_interface *intf, hdev->notify = btusb_notify; hdev->prevent_wake = btusb_prevent_wake; + if (id->driver_info & BTUSB_AMP) { + /* AMP controllers do not support SCO packets */ + data->isoc = NULL; + } else { + /* Interface orders are hardcoded in the specification */ + data->isoc = usb_ifnum_to_if(data->udev, ifnum_base + 1); + data->isoc_ifnum = ifnum_base + 1; + } + #ifdef CONFIG_PM err = btusb_config_oob_wake(hdev); if (err) @@ -4021,6 +4046,10 @@ static int btusb_probe(struct usb_interface *intf, hdev->set_diag = btintel_set_diag; hdev->set_bdaddr = btintel_set_bdaddr; hdev->cmd_timeout = btusb_intel_cmd_timeout; + + if (btusb_find_altsetting(data, 6)) + hdev->sco_pkt_len = hci_packet_size_usb_alt[6]; + set_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER, &hdev->quirks); set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks); set_bit(HCI_QUIRK_NON_PERSISTENT_DIAG, &hdev->quirks); @@ -4062,15 +4091,6 @@ static int btusb_probe(struct usb_interface *intf, btusb_check_needs_reset_resume(intf); } - if (id->driver_info & BTUSB_AMP) { - /* AMP controllers do not support SCO packets */ - data->isoc = NULL; - } else { - /* Interface orders are hardcoded in the specification */ - data->isoc = usb_ifnum_to_if(data->udev, ifnum_base + 1); - data->isoc_ifnum = ifnum_base + 1; - } - if (IS_ENABLED(CONFIG_BT_HCIBTUSB_RTL) && (id->driver_info & BTUSB_REALTEK)) { hdev->setup = btrtl_setup_realtek; @@ -4082,9 +4102,10 @@ static int btusb_probe(struct usb_interface *intf, * (DEVICE_REMOTE_WAKEUP) */ set_bit(BTUSB_WAKEUP_DISABLE, &data->flags); - if (btusb_find_altsetting(data, 1)) + if (btusb_find_altsetting(data, 1)) { set_bit(BTUSB_USE_ALT1_FOR_WBS, &data->flags); - else + hdev->sco_pkt_len = hci_packet_size_usb_alt[1]; + } else bt_dev_err(hdev, "Device does not support ALT setting 1"); } diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h index 8caac20556b499..0624496328fc09 100644 --- a/include/net/bluetooth/hci_core.h +++ b/include/net/bluetooth/hci_core.h @@ -417,6 +417,7 @@ struct hci_dev { unsigned int acl_pkts; unsigned int sco_pkts; unsigned int le_pkts; + unsigned int sco_pkt_len; __u16 block_len; __u16 block_mtu; -- 2.28.0.236.gb10cc79966-goog