From patchwork Tue Apr 19 22:39:04 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Octavian Purdila X-Patchwork-Id: 8883761 Return-Path: X-Original-To: patchwork-linux-spi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 3C4B99F36E for ; Tue, 19 Apr 2016 22:42:11 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 4D44C202B8 for ; Tue, 19 Apr 2016 22:42:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5CF902013A for ; Tue, 19 Apr 2016 22:42:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932671AbcDSWle (ORCPT ); Tue, 19 Apr 2016 18:41:34 -0400 Received: from mga04.intel.com ([192.55.52.120]:61700 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932391AbcDSWjy (ORCPT ); Tue, 19 Apr 2016 18:39:54 -0400 Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga104.fm.intel.com with ESMTP; 19 Apr 2016 15:39:54 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.24,507,1455004800"; d="scan'208";a="88266312" Received: from mbenvenu-mobl.ger.corp.intel.com (HELO opurdila-mobl.ger.corp.intel.com) ([10.252.34.94]) by fmsmga004.fm.intel.com with ESMTP; 19 Apr 2016 15:39:50 -0700 From: Octavian Purdila To: "Rafael J. Wysocki" , Len Brown , Matt Fleming , Mark Brown , Wolfram Sang Cc: Joel Becker , linux-acpi@vger.kernel.org, linux-efi@vger.kernel.org, linux-i2c@vger.kernel.org, linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, irina.tirdea@intel.com, Octavian Purdila Subject: [RFC PATCH v2 06/10] spi: add support for ACPI reconfigure notifications Date: Wed, 20 Apr 2016 01:39:04 +0300 Message-Id: <1461105548-20618-7-git-send-email-octavian.purdila@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1461105548-20618-1-git-send-email-octavian.purdila@intel.com> References: <1461105548-20618-1-git-send-email-octavian.purdila@intel.com> Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org X-Spam-Status: No, score=-7.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds supports for SPI device enumeration and removal via ACPI reconfiguration notifications that are send as a result of an ACPI table load or unload operation. Signed-off-by: Octavian Purdila Reviewed-by: Mika Westerberg --- drivers/spi/spi.c | 94 ++++++++++++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 87 insertions(+), 7 deletions(-) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index de2f2f9..d6c5a9c 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1644,18 +1644,15 @@ static int acpi_spi_add_resource(struct acpi_resource *ares, void *data) return 1; } -static acpi_status acpi_spi_add_device(acpi_handle handle, u32 level, - void *data, void **return_value) +static acpi_status acpi_register_spi_device(struct spi_master *master, + struct acpi_device *adev) { - struct spi_master *master = data; struct list_head resource_list; - struct acpi_device *adev; struct spi_device *spi; int ret; - if (acpi_bus_get_device(handle, &adev)) - return AE_OK; - if (acpi_bus_get_status(adev) || !adev->status.present) + if (acpi_bus_get_status(adev) || !adev->status.present || + acpi_device_enumerated(adev)) return AE_OK; spi = spi_alloc_device(master); @@ -1681,6 +1678,8 @@ static acpi_status acpi_spi_add_device(acpi_handle handle, u32 level, if (spi->irq < 0) spi->irq = acpi_dev_gpio_irq_get(adev, 0); + adev->flags.visited = true; + adev->power.flags.ignore_parent = true; strlcpy(spi->modalias, acpi_device_hid(adev), sizeof(spi->modalias)); if (spi_add_device(spi)) { @@ -1693,6 +1692,18 @@ static acpi_status acpi_spi_add_device(acpi_handle handle, u32 level, return AE_OK; } +static acpi_status acpi_spi_add_device(acpi_handle handle, u32 level, + void *data, void **return_value) +{ + struct spi_master *master = data; + struct acpi_device *adev; + + if (acpi_bus_get_device(handle, &adev)) + return AE_OK; + + return acpi_register_spi_device(master, adev); +} + static void acpi_register_spi_devices(struct spi_master *master) { acpi_status status; @@ -3104,6 +3115,73 @@ static struct notifier_block spi_of_notifier = { extern struct notifier_block spi_of_notifier; #endif /* IS_ENABLED(CONFIG_OF_DYNAMIC) */ +#if IS_ENABLED(CONFIG_ACPI) +static int spi_acpi_master_match(struct device *dev, const void *data) +{ + return ACPI_COMPANION(dev->parent) == data; +} + +static int spi_acpi_device_match(struct device *dev, void *data) +{ + return ACPI_COMPANION(dev) == data; +} + +static struct spi_master *acpi_spi_find_master_by_adev(struct acpi_device *adev) +{ + struct device *dev; + + dev = class_find_device(&spi_master_class, NULL, adev, + spi_acpi_master_match); + if (!dev) + return NULL; + + return container_of(dev, struct spi_master, dev); +} + +static struct spi_device *acpi_spi_find_device_by_adev(struct acpi_device *adev) +{ + struct device *dev; + + dev = bus_find_device(&spi_bus_type, NULL, adev, spi_acpi_device_match); + + return dev ? to_spi_device(dev) : NULL; +} + +static int acpi_spi_notify(struct notifier_block *nb, unsigned long value, + void *arg) +{ + struct acpi_device *adev = arg; + struct spi_master *master; + struct spi_device *spi; + + switch (value) { + case ACPI_RECONFIG_DEVICE_ADD: + master = acpi_spi_find_master_by_adev(adev->parent); + if (!master) + break; + + acpi_register_spi_device(master, adev); + put_device(&master->dev); + break; + case ACPI_RECONFIG_DEVICE_REMOVE: + spi = acpi_spi_find_device_by_adev(adev); + if (!spi) + break; + + spi_unregister_device(spi); + put_device(&spi->dev); + } + + return NOTIFY_OK; +} + +static struct notifier_block spi_acpi_notifier = { + .notifier_call = acpi_spi_notify, +}; +#else +extern struct notifier_block spi_acpi_notifier; +#endif + static int __init spi_init(void) { int status; @@ -3124,6 +3202,8 @@ static int __init spi_init(void) if (IS_ENABLED(CONFIG_OF_DYNAMIC)) WARN_ON(of_reconfig_notifier_register(&spi_of_notifier)); + if (IS_ENABLED(CONFIG_ACPI)) + WARN_ON(acpi_reconfig_notifier_register(&spi_acpi_notifier)); return 0;