Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756972AbcCaJmf (ORCPT ); Thu, 31 Mar 2016 05:42:35 -0400 Received: from mga09.intel.com ([134.134.136.24]:8177 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755223AbcCaJh5 (ORCPT ); Thu, 31 Mar 2016 05:37:57 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.24,421,1455004800"; d="scan'208";a="945123524" From: Octavian Purdila To: "Rafael J. Wysocki" , Len Brown , Matt Fleming , Mark Brown , Wolfram Sang Cc: Joel Becker , Christoph Hellwig , 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 05/10] i2c: add support for ACPI reconfigure notifications Date: Thu, 31 Mar 2016 12:37:01 +0300 Message-Id: <1459417026-6697-6-git-send-email-octavian.purdila@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1459417026-6697-1-git-send-email-octavian.purdila@intel.com> References: <1459417026-6697-1-git-send-email-octavian.purdila@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2671 Lines: 89 This allows the i2c core to enumerate devices from ACPI tables that are dynamically loaded after the i2c adapter has been probed. Signed-off-by: Octavian Purdila --- drivers/i2c/i2c-core.c | 38 +++++++++++++++++++++++++++++++++++++- 1 file changed, 37 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index ffe715d..7a6f741 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -150,7 +150,8 @@ static acpi_status acpi_i2c_add_device(acpi_handle handle, u32 level, 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; memset(&info, 0, sizeof(info)); @@ -189,6 +190,9 @@ static acpi_status acpi_i2c_add_device(acpi_handle handle, u32 level, adev->power.flags.ignore_parent = true; strlcpy(info.type, dev_name(&adev->dev), sizeof(info.type)); + + adev->flags.visited = true; + if (!i2c_new_device(adapter, &info)) { adev->power.flags.ignore_parent = false; dev_err(&adapter->dev, @@ -224,8 +228,36 @@ static void acpi_i2c_register_devices(struct i2c_adapter *adap) dev_warn(&adap->dev, "failed to enumerate I2C slaves\n"); } +static int acpi_i2c_table_load(struct device *dev, void *data) +{ + struct i2c_adapter *adapter = i2c_verify_adapter(dev); + + if (!adapter) + return 0; + + acpi_i2c_register_devices(adapter); + return 0; +} + +static int acpi_i2c_notify(struct notifier_block *nb, unsigned long value, + void *arg) +{ + switch (value) { + case ACPI_RECONFIG_TABLE_LOAD: + bus_find_device(&i2c_bus_type, NULL, NULL, + acpi_i2c_table_load); + break; + } + + return NOTIFY_OK; +} + +static struct notifier_block i2c_acpi_notifier = { + .notifier_call = acpi_i2c_notify, +}; #else /* CONFIG_ACPI */ static inline void acpi_i2c_register_devices(struct i2c_adapter *adap) { } +extern struct notifier_block i2c_acpi_notifier; #endif /* CONFIG_ACPI */ #ifdef CONFIG_ACPI_I2C_OPREGION @@ -2117,6 +2149,8 @@ static int __init i2c_init(void) if (IS_ENABLED(CONFIG_OF_DYNAMIC)) WARN_ON(of_reconfig_notifier_register(&i2c_of_notifier)); + if (IS_ENABLED(CONFIG_ACPI)) + WARN_ON(acpi_reconfig_notifier_register(&i2c_acpi_notifier)); return 0; @@ -2131,6 +2165,8 @@ bus_err: static void __exit i2c_exit(void) { + if (IS_ENABLED(CONFIG_ACPI)) + WARN_ON(acpi_reconfig_notifier_unregister(&i2c_acpi_notifier)); if (IS_ENABLED(CONFIG_OF_DYNAMIC)) WARN_ON(of_reconfig_notifier_unregister(&i2c_of_notifier)); i2c_del_driver(&dummy_driver); -- 1.9.1