From patchwork Wed Dec 21 20:33:51 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rajat Jain X-Patchwork-Id: 707949 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3tkRGN202sz9s1h for ; Thu, 22 Dec 2016 07:34:36 +1100 (AEDT) Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.b="D4PdArqw"; dkim-atps=neutral Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964798AbcLUUeM (ORCPT ); Wed, 21 Dec 2016 15:34:12 -0500 Received: from mail-pg0-f43.google.com ([74.125.83.43]:34359 "EHLO mail-pg0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757939AbcLUUeI (ORCPT ); Wed, 21 Dec 2016 15:34:08 -0500 Received: by mail-pg0-f43.google.com with SMTP id y62so36817328pgy.1 for ; Wed, 21 Dec 2016 12:34:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=O5AtJXokNSfZPJgOUL+L/uVQRfShsDFzBiudk80hxxE=; b=D4PdArqwazAkRr5rTD67LqpjhY6cUxpkClPATU8XX6bqTcafwKyzfJ3veeNougZmDD Cbz+/Rvd1O/FCn+Ak93VQ8uR7mUmv53WyH3prIbb18BuBowpajPt+P0tFcvd40KiTZXe F3nnyzEAHrwPuEyk4YufIqs1dmc3IQV3uOb8kqzqvF8X0R1PE8OKck3/mRYZZQyKbELo JOiTctXBvOYZdHbdUbL/Jm4Ms9GVXxHjZ1Ojsmsbd459k+Ic3s2HdOftAHttUJmRwwhh Q8H4Oseo597dwadkvLsLiIRNJEhF4cyQ0KxF34G+XVq1BsB8oguP/EiApdhUISRF3Gj+ dFDQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=O5AtJXokNSfZPJgOUL+L/uVQRfShsDFzBiudk80hxxE=; b=jPsei40+xtz1QfcbTbsBuG9B9hocC7L2J/E/xCGoeRoql12lsjTd76RrErhGD8I9Pz 3+X1dlLxz8PyMl7YyzfhKWiZl70hstACxkgUOUtIdamP0cLTG2gPoHYkxKTlDaOZZUSH Fp8xbqKxz7HETpa6JcpHLAqAFHIBHONl+4PuvF6NyTXRGUfNC9fKL0UFD2EbECihxXoq 1fko0bOeBoofqOKvrKC7ug8QzkgoeJEAbFpDQZdNywykJ3b3o1Q+xWe8PhnOD1j8BvMv gXVf4Auz+WYbkv8Oqsgt691tLBSsmCUxKSM2S8CetBy4z/vUdZsf1xQzgW1F8ZuaXFg2 9s4w== X-Gm-Message-State: AIkVDXJWjLzUWBx/tbsNMSv/77TNnYawiMPAv4TrjF1YnhXfQWEE5Yl8meI2RAZhkKTrFmRB X-Received: by 10.99.219.21 with SMTP id e21mr10540150pgg.136.1482352447392; Wed, 21 Dec 2016 12:34:07 -0800 (PST) Received: from rajat.mtv.corp.google.com ([172.22.64.13]) by smtp.gmail.com with ESMTPSA id a11sm48905076pfe.96.2016.12.21.12.34.06 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 21 Dec 2016 12:34:07 -0800 (PST) From: Rajat Jain To: Rob Herring , Mark Rutland , Marcel Holtmann , Gustavo Padovan , Johan Hedberg , Amitkumar Karwar , Wei-Ning Huang , Xinming Hu , netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-bluetooth@vger.kernel.org, Brian Norris , linux-kernel@vger.kernel.org Cc: Rajat Jain , rajatxjain@gmail.com Subject: [PATCH v4 2/3] Bluetooth: btusb: Add out-of-band wakeup support Date: Wed, 21 Dec 2016 12:33:51 -0800 Message-Id: <1482352432-38302-2-git-send-email-rajatja@google.com> X-Mailer: git-send-email 2.8.0.rc3.226.g39d4020 In-Reply-To: <1482352432-38302-1-git-send-email-rajatja@google.com> References: <1482352432-38302-1-git-send-email-rajatja@google.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Some onboard BT chips (e.g. Marvell 8997) contain a wakeup pin that can be connected to a gpio on the CPU side, and can be used to wakeup the host out-of-band. This can be useful in situations where the in-band wakeup is not possible or not preferable (e.g. the in-band wakeup may require the USB host controller to remain active, and hence consuming more system power during system sleep). The oob gpio interrupt to be used for wakeup on the CPU side, is read from the device tree node, (using standard interrupt descriptors). A devcie tree binding document is also added for the driver. The compatible string is in compliance with Documentation/devicetree/bindings/usb/usb-device.txt Signed-off-by: Rajat Jain Reviewed-by: Brian Norris Acked-by: Rob Herring --- v4: Move the set_bit(BTUSB_OOB_WAKE_DISABLED,..) call to the beginning of btusb_config_oob_wake() - caught by Brian. v3: Add Brian's "Reviewed-by" v2: * Use interrupt-names ("wakeup") instead of assuming first interrupt. * Leave it on device tree to specify IRQ flags (level /edge triggered) * Mark the device as non wakeable on exit. Documentation/devicetree/bindings/net/btusb.txt | 40 ++++++++++++ drivers/bluetooth/btusb.c | 84 +++++++++++++++++++++++++ 2 files changed, 124 insertions(+) create mode 100644 Documentation/devicetree/bindings/net/btusb.txt diff --git a/Documentation/devicetree/bindings/net/btusb.txt b/Documentation/devicetree/bindings/net/btusb.txt new file mode 100644 index 0000000..2c0355c --- /dev/null +++ b/Documentation/devicetree/bindings/net/btusb.txt @@ -0,0 +1,40 @@ +Generic Bluetooth controller over USB (btusb driver) +--------------------------------------------------- + +Required properties: + + - compatible : should comply with the format "usbVID,PID" specified in + Documentation/devicetree/bindings/usb/usb-device.txt + At the time of writing, the only OF supported devices + (more may be added later) are: + + "usb1286,204e" (Marvell 8997) + +Optional properties: + + - interrupt-parent: phandle of the parent interrupt controller + - interrupt-names: (see below) + - interrupts : The interrupt specified by the name "wakeup" is the interrupt + that shall be used for out-of-band wake-on-bt. Driver will + request this interrupt for wakeup. During system suspend, the + irq will be enabled so that the bluetooth chip can wakeup host + platform out of band. During system resume, the irq will be + disabled to make sure unnecessary interrupt is not received. + +Example: + +Following example uses irq pin number 3 of gpio0 for out of band wake-on-bt: + +&usb_host1_ehci { + status = "okay"; + #address-cells = <1>; + #size-cells = <0>; + + mvl_bt1: bt@1 { + compatible = "usb1286,204e"; + reg = <1>; + interrupt-parent = <&gpio0>; + interrupt-name = "wakeup"; + interrupts = <3 IRQ_TYPE_LEVEL_LOW>; + }; +}; diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index ce22cef..2b45f1c 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -24,6 +24,8 @@ #include #include #include +#include +#include #include #include @@ -369,6 +371,7 @@ static const struct usb_device_id blacklist_table[] = { #define BTUSB_BOOTING 9 #define BTUSB_RESET_RESUME 10 #define BTUSB_DIAG_RUNNING 11 +#define BTUSB_OOB_WAKE_DISABLED 12 struct btusb_data { struct hci_dev *hdev; @@ -416,6 +419,8 @@ struct btusb_data { int (*recv_bulk)(struct btusb_data *data, void *buffer, int count); int (*setup_on_usb)(struct hci_dev *hdev); + + int oob_wake_irq; /* irq for out-of-band wake-on-bt */ }; static inline void btusb_free_frags(struct btusb_data *data) @@ -2728,6 +2733,65 @@ static int btusb_bcm_set_diag(struct hci_dev *hdev, bool enable) } #endif +#ifdef CONFIG_PM +static irqreturn_t btusb_oob_wake_handler(int irq, void *priv) +{ + struct btusb_data *data = priv; + + /* Disable only if not already disabled (keep it balanced) */ + if (!test_and_set_bit(BTUSB_OOB_WAKE_DISABLED, &data->flags)) { + disable_irq_nosync(irq); + disable_irq_wake(irq); + } + pm_wakeup_event(&data->udev->dev, 0); + return IRQ_HANDLED; +} + +static const struct of_device_id btusb_match_table[] = { + { .compatible = "usb1286,204e" }, + { } +}; +MODULE_DEVICE_TABLE(of, btusb_match_table); + +/* Use an oob wakeup pin? */ +static int btusb_config_oob_wake(struct hci_dev *hdev) +{ + struct btusb_data *data = hci_get_drvdata(hdev); + struct device *dev = &data->udev->dev; + int irq, ret; + + set_bit(BTUSB_OOB_WAKE_DISABLED, &data->flags); + + if (!of_match_device(btusb_match_table, dev)) + return 0; + + /* Move on if no IRQ specified */ + irq = of_irq_get_byname(dev->of_node, "wakeup"); + if (irq <= 0) { + bt_dev_dbg(hdev, "%s: no OOB Wakeup IRQ in DT", __func__); + return 0; + } + + ret = devm_request_irq(&hdev->dev, irq, btusb_oob_wake_handler, + 0, "OOB Wake-on-BT", data); + if (ret) { + bt_dev_err(hdev, "%s: IRQ request failed", __func__); + return ret; + } + + ret = device_init_wakeup(dev, true); + if (ret) { + bt_dev_err(hdev, "%s: failed to init_wakeup\n", __func__); + return ret; + } + + data->oob_wake_irq = irq; + disable_irq(irq); + bt_dev_info(hdev, "OOB Wake-on-BT configured at IRQ %u\n", irq); + return 0; +} +#endif + static int btusb_probe(struct usb_interface *intf, const struct usb_device_id *id) { @@ -2849,6 +2913,11 @@ static int btusb_probe(struct usb_interface *intf, hdev->send = btusb_send_frame; hdev->notify = btusb_notify; +#ifdef CONFIG_PM + err = btusb_config_oob_wake(hdev); + if (err) + goto out_free_dev; +#endif if (id->driver_info & BTUSB_CW6622) set_bit(HCI_QUIRK_BROKEN_STORED_LINK_KEY, &hdev->quirks); @@ -3061,6 +3130,9 @@ static void btusb_disconnect(struct usb_interface *intf) usb_driver_release_interface(&btusb_driver, data->isoc); } + if (data->oob_wake_irq) + device_init_wakeup(&data->udev->dev, false); + hci_free_dev(hdev); } @@ -3089,6 +3161,12 @@ static int btusb_suspend(struct usb_interface *intf, pm_message_t message) btusb_stop_traffic(data); usb_kill_anchored_urbs(&data->tx_anchor); + if (data->oob_wake_irq && device_may_wakeup(&data->udev->dev)) { + clear_bit(BTUSB_OOB_WAKE_DISABLED, &data->flags); + enable_irq_wake(data->oob_wake_irq); + enable_irq(data->oob_wake_irq); + } + /* Optionally request a device reset on resume, but only when * wakeups are disabled. If wakeups are enabled we assume the * device will stay powered up throughout suspend. @@ -3126,6 +3204,12 @@ static int btusb_resume(struct usb_interface *intf) if (--data->suspend_count) return 0; + /* Disable only if not already disabled (keep it balanced) */ + if (!test_and_set_bit(BTUSB_OOB_WAKE_DISABLED, &data->flags)) { + disable_irq(data->oob_wake_irq); + disable_irq_wake(data->oob_wake_irq); + } + if (!test_bit(HCI_RUNNING, &hdev->flags)) goto done;