From patchwork Tue Dec 12 21:59:18 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Lechner X-Patchwork-Id: 847646 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=lechnology.com header.i=@lechnology.com header.b="pAVYr3Y1"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3yxDJm1gwzz9sNc for ; Wed, 13 Dec 2017 09:00:08 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752804AbdLLWAF (ORCPT ); Tue, 12 Dec 2017 17:00:05 -0500 Received: from vern.gendns.com ([206.190.152.46]:47209 "EHLO vern.gendns.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752564AbdLLV7p (ORCPT ); Tue, 12 Dec 2017 16:59:45 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lechnology.com; s=default; h=References:In-Reply-To:Message-Id:Date:Subject :Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=RWWfqDmMa/l3tfKN78KhEkLm602P6tdzh/JG6ZRU/2U=; b=pAVYr3Y1SqLELe7hnJh+mJeXI lXvla+pl411sTD6q2u5SNJZIoXTYBI+Enqb2UsrN88gOEYICfvtbGdORaqXE2OmoXzXg6K1XoTrl0 A9Ws1vVmCpZYZKtJ6dJw5DhLqV6Mv2Uz+mes7W2NNwd2ZB5fwWThDtVnjtiJSJKNuEtFbQmusTQOC RVHiT1E26aCAEfpEcfs8JGPwLHytZrWo+rRQIpWp+0+4AgrpRiN7i1iESAH4J3BFWq7WgU7ppX4Mw LPTwtuuCu6PJdO4q+OLqRfDMwireTXfEpSexul7hIoA1xSoCU1W4rUl0T5wlrG/UzzCgx/fuAlZJ2 XoJa64jRw==; Received: from 108-198-5-147.lightspeed.okcbok.sbcglobal.net ([108.198.5.147]:46594 helo=freyr.lechnology.com) by vern.gendns.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-SHA256:128) (Exim 4.89) (envelope-from ) id 1eOsYk-001dUy-Kd; Tue, 12 Dec 2017 16:57:54 -0500 From: David Lechner To: devicetree@vger.kernel.org, linux-bluetooth@vger.kernel.org Cc: David Lechner , Rob Herring , Mark Rutland , Marcel Holtmann , Gustavo Padovan , Johan Hedberg , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] Bluetooth: hci_ll: Add optional nvmem BD address source Date: Tue, 12 Dec 2017 15:59:18 -0600 Message-Id: <1513115958-23761-4-git-send-email-david@lechnology.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1513115958-23761-1-git-send-email-david@lechnology.com> References: <1513115958-23761-1-git-send-email-david@lechnology.com> X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - vern.gendns.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - lechnology.com X-Get-Message-Sender-Via: vern.gendns.com: authenticated_id: davidmain+lechnology.com/only user confirmed/virtual account not confirmed X-Authenticated-Sender: vern.gendns.com: davidmain@lechnology.com X-Source: X-Source-Args: X-Source-Dir: Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This adds an optional nvmem consumer to get a BD address from an external source. The BD address is then set in the Bluetooth chip after the firmware has been loaded. This has been tested working with a TI CC2560A chip (in a LEGO MINDSTORMS EV3). Signed-off-by: David Lechner --- drivers/bluetooth/hci_ll.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) diff --git a/drivers/bluetooth/hci_ll.c b/drivers/bluetooth/hci_ll.c index c948e8d..ed042ae 100644 --- a/drivers/bluetooth/hci_ll.c +++ b/drivers/bluetooth/hci_ll.c @@ -53,6 +53,7 @@ #include #include #include +#include #include "hci_uart.h" @@ -90,6 +91,7 @@ struct ll_device { struct serdev_device *serdev; struct gpio_desc *enable_gpio; struct clk *ext_clk; + bdaddr_t bdaddr; }; struct ll_struct { @@ -719,6 +721,18 @@ static int ll_setup(struct hci_uart *hu) if (err) return err; + /* Set BD address if one was specified at probe */ + if (!bacmp(&lldev->bdaddr, BDADDR_NONE)) { + /* This means that there was an error getting the BD address + * during probe, so mark the device as having a bad address. + */ + set_bit(HCI_QUIRK_INVALID_BDADDR, &hu->hdev->quirks); + } else if (bacmp(&lldev->bdaddr, BDADDR_ANY)) { + err = ll_set_bdaddr(hu->hdev, &lldev->bdaddr); + if (err) + set_bit(HCI_QUIRK_INVALID_BDADDR, &hu->hdev->quirks); + } + /* Operational speed if any */ if (hu->oper_speed) speed = hu->oper_speed; @@ -749,6 +763,7 @@ static int hci_ti_probe(struct serdev_device *serdev) { struct hci_uart *hu; struct ll_device *lldev; + struct nvmem_cell *bdaddr_cell; u32 max_speed = 3000000; lldev = devm_kzalloc(&serdev->dev, sizeof(struct ll_device), GFP_KERNEL); @@ -770,6 +785,52 @@ static int hci_ti_probe(struct serdev_device *serdev) of_property_read_u32(serdev->dev.of_node, "max-speed", &max_speed); hci_uart_set_speeds(hu, 115200, max_speed); + /* optional BD address from nvram */ + bdaddr_cell = nvmem_cell_get(&serdev->dev, "bd-address"); + if (IS_ERR(bdaddr_cell)) { + int err = PTR_ERR(bdaddr_cell); + + if (err == -EPROBE_DEFER) + return err; + + /* ENOENT means there is no matching nvmem cell and ENOSYS + * means that nvmem is not enabled in the kernel configuration. + */ + if (err != -ENOENT && err != -ENOSYS) { + /* If there was some other error, give userspace a + * chance to fix the problem instead of failing to load + * the driver. Using BDADDR_NONE as a flag that is + * tested later in the setup function. + */ + dev_warn(&serdev->dev, + "Failed to get \"bd-address\" nvmem cell (%d)\n", + err); + bacpy(&lldev->bdaddr, BDADDR_NONE); + } + } else { + bdaddr_t *bdaddr; + int len; + + bdaddr = nvmem_cell_read(bdaddr_cell, &len); + nvmem_cell_put(bdaddr_cell); + if (IS_ERR(bdaddr)) { + dev_err(&serdev->dev, "Failed to read nvmem bd-address\n"); + return PTR_ERR(bdaddr); + } + if (len != sizeof(bdaddr_t)) { + dev_err(&serdev->dev, "Invalid nvmem bd-address length\n"); + kfree(bdaddr); + return -EINVAL; + } + + /* As per the device tree bindings, the value from nvmem is + * expected to be MSB first, but in the kernel it is expected + * that bdaddr_t is LSB first. + */ + baswap(&lldev->bdaddr, bdaddr); + kfree(bdaddr); + } + return hci_uart_register_device(hu, &llp); }