From patchwork Tue May 20 12:59:24 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "lan,Tianyu" X-Patchwork-Id: 4209461 Return-Path: X-Original-To: patchwork-linux-acpi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id D5D7EBEEAB for ; Tue, 20 May 2014 13:00:42 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 8B731202FF for ; Tue, 20 May 2014 13:00:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 607062020A for ; Tue, 20 May 2014 13:00:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753534AbaETNAL (ORCPT ); Tue, 20 May 2014 09:00:11 -0400 Received: from mga09.intel.com ([134.134.136.24]:50265 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752886AbaETNAI (ORCPT ); Tue, 20 May 2014 09:00:08 -0400 Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga102.jf.intel.com with ESMTP; 20 May 2014 05:54:47 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.98,874,1392192000"; d="scan'208";a="543531972" Received: from tlan1-mobl3.sh.intel.com (HELO localhost) ([10.239.197.220]) by orsmga002.jf.intel.com with ESMTP; 20 May 2014 05:59:49 -0700 From: Lan Tianyu To: wsa@the-dreams.de, rjw@rjwysocki.net, mika.westerberg@linux.intel.com, awilliam@redhat.com, lenb@kernel.org Cc: Lan Tianyu , linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org Subject: [Patch V3 5/5] I2C/ACPI: Clean up I2C ACPI code and Add CONFIG_I2C_ACPI config Date: Tue, 20 May 2014 20:59:24 +0800 Message-Id: <1400590764-11108-6-git-send-email-tianyu.lan@intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1400590764-11108-1-git-send-email-tianyu.lan@intel.com> References: <1400590764-11108-1-git-send-email-tianyu.lan@intel.com> Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org X-Spam-Status: No, score=-7.5 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 Clean up ACPI related code in the i2c core and add CONFIG_I2C_ACPI to enable I2C ACPI code. Current there is a race between removing I2C ACPI operation region and ACPI AML code accessing. So make i2c core built-in if CONFIG_I2C_ACPI is set. Reviewed-by: Mika Westerberg Signed-off-by: Lan Tianyu --- drivers/i2c/Kconfig | 18 +++++++++- drivers/i2c/Makefile | 2 +- drivers/i2c/i2c-acpi.c | 89 ++++++++++++++++++++++++++++++++++++++++++++++ drivers/i2c/i2c-core.c | 95 -------------------------------------------------- include/linux/i2c.h | 4 ++- 5 files changed, 110 insertions(+), 98 deletions(-) diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig index 7b7ea32..3e3b680 100644 --- a/drivers/i2c/Kconfig +++ b/drivers/i2c/Kconfig @@ -2,7 +2,9 @@ # I2C subsystem configuration # -menuconfig I2C +menu "I2C support" + +config I2C tristate "I2C support" select RT_MUTEXES ---help--- @@ -21,6 +23,18 @@ menuconfig I2C This I2C support can also be built as a module. If so, the module will be called i2c-core. +config I2C_ACPI + bool "I2C ACPI support" + select I2C + depends on ACPI + default y + help + Say Y here if you want to enable ACPI I2C support. This includes support + for automatic enumeration of I2C slave devices and support for ACPI I2C + Operation Regions. Operation Regions allow firmware (BIOS) code to + access I2C slave devices, such as smart batteries through an I2C host + controller driver. + if I2C config I2C_BOARDINFO @@ -124,3 +138,5 @@ config I2C_DEBUG_BUS on. endif # I2C + +endmenu diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile index 80db307..a1f590c 100644 --- a/drivers/i2c/Makefile +++ b/drivers/i2c/Makefile @@ -3,7 +3,7 @@ # i2ccore-y := i2c-core.o -i2ccore-$(CONFIG_ACPI) += i2c-acpi.o +i2ccore-$(CONFIG_I2C_ACPI) += i2c-acpi.o obj-$(CONFIG_I2C_BOARDINFO) += i2c-boardinfo.o obj-$(CONFIG_I2C) += i2ccore.o diff --git a/drivers/i2c/i2c-acpi.c b/drivers/i2c/i2c-acpi.c index f7f4c89..e8b6196 100644 --- a/drivers/i2c/i2c-acpi.c +++ b/drivers/i2c/i2c-acpi.c @@ -37,6 +37,95 @@ struct gsb_buffer { }; } __packed; +static int acpi_i2c_add_resource(struct acpi_resource *ares, void *data) +{ + struct i2c_board_info *info = data; + + if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) { + struct acpi_resource_i2c_serialbus *sb; + + sb = &ares->data.i2c_serial_bus; + if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_I2C) { + info->addr = sb->slave_address; + if (sb->access_mode == ACPI_I2C_10BIT_MODE) + info->flags |= I2C_CLIENT_TEN; + } + } else if (info->irq < 0) { + struct resource r; + + if (acpi_dev_resource_interrupt(ares, 0, &r)) + info->irq = r.start; + } + + /* Tell the ACPI core to skip this resource */ + return 1; +} + +static acpi_status acpi_i2c_add_device(acpi_handle handle, u32 level, + void *data, void **return_value) +{ + struct i2c_adapter *adapter = data; + struct list_head resource_list; + struct i2c_board_info info; + struct acpi_device *adev; + int ret; + + if (acpi_bus_get_device(handle, &adev)) + return AE_OK; + if (acpi_bus_get_status(adev) || !adev->status.present) + return AE_OK; + + memset(&info, 0, sizeof(info)); + info.acpi_node.companion = adev; + info.irq = -1; + + INIT_LIST_HEAD(&resource_list); + ret = acpi_dev_get_resources(adev, &resource_list, + acpi_i2c_add_resource, &info); + acpi_dev_free_resource_list(&resource_list); + + if (ret < 0 || !info.addr) + return AE_OK; + + adev->power.flags.ignore_parent = true; + strlcpy(info.type, dev_name(&adev->dev), sizeof(info.type)); + if (!i2c_new_device(adapter, &info)) { + adev->power.flags.ignore_parent = false; + dev_err(&adapter->dev, + "failed to add I2C device %s from ACPI\n", + dev_name(&adev->dev)); + } + + return AE_OK; +} + +/** + * acpi_i2c_register_devices - enumerate I2C slave devices behind adapter + * @adap: pointer to adapter + * + * Enumerate all I2C slave devices behind this adapter by walking the ACPI + * namespace. When a device is found it will be added to the Linux device + * model and bound to the corresponding ACPI handle. + */ +void acpi_i2c_register_devices(struct i2c_adapter *adap) +{ + acpi_handle handle; + acpi_status status; + + if (!adap->dev.parent) + return; + + handle = ACPI_HANDLE(adap->dev.parent); + if (!handle) + return; + + status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, + acpi_i2c_add_device, NULL, + adap, NULL); + if (ACPI_FAILURE(status)) + dev_warn(&adap->dev, "failed to enumerate I2C slaves\n"); +} + static int acpi_gsb_i2c_read_bytes(struct i2c_client *client, u8 cmd, u8 *data, u8 data_len) { diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index e25cb84..4ccff11 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -1092,101 +1092,6 @@ EXPORT_SYMBOL(of_find_i2c_adapter_by_node); static void of_i2c_register_devices(struct i2c_adapter *adap) { } #endif /* CONFIG_OF */ -/* ACPI support code */ - -#if IS_ENABLED(CONFIG_ACPI) -static int acpi_i2c_add_resource(struct acpi_resource *ares, void *data) -{ - struct i2c_board_info *info = data; - - if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) { - struct acpi_resource_i2c_serialbus *sb; - - sb = &ares->data.i2c_serial_bus; - if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_I2C) { - info->addr = sb->slave_address; - if (sb->access_mode == ACPI_I2C_10BIT_MODE) - info->flags |= I2C_CLIENT_TEN; - } - } else if (info->irq < 0) { - struct resource r; - - if (acpi_dev_resource_interrupt(ares, 0, &r)) - info->irq = r.start; - } - - /* Tell the ACPI core to skip this resource */ - return 1; -} - -static acpi_status acpi_i2c_add_device(acpi_handle handle, u32 level, - void *data, void **return_value) -{ - struct i2c_adapter *adapter = data; - struct list_head resource_list; - struct i2c_board_info info; - struct acpi_device *adev; - int ret; - - if (acpi_bus_get_device(handle, &adev)) - return AE_OK; - if (acpi_bus_get_status(adev) || !adev->status.present) - return AE_OK; - - memset(&info, 0, sizeof(info)); - info.acpi_node.companion = adev; - info.irq = -1; - - INIT_LIST_HEAD(&resource_list); - ret = acpi_dev_get_resources(adev, &resource_list, - acpi_i2c_add_resource, &info); - acpi_dev_free_resource_list(&resource_list); - - if (ret < 0 || !info.addr) - return AE_OK; - - adev->power.flags.ignore_parent = true; - strlcpy(info.type, dev_name(&adev->dev), sizeof(info.type)); - if (!i2c_new_device(adapter, &info)) { - adev->power.flags.ignore_parent = false; - dev_err(&adapter->dev, - "failed to add I2C device %s from ACPI\n", - dev_name(&adev->dev)); - } - - return AE_OK; -} - -/** - * acpi_i2c_register_devices - enumerate I2C slave devices behind adapter - * @adap: pointer to adapter - * - * Enumerate all I2C slave devices behind this adapter by walking the ACPI - * namespace. When a device is found it will be added to the Linux device - * model and bound to the corresponding ACPI handle. - */ -static void acpi_i2c_register_devices(struct i2c_adapter *adap) -{ - acpi_handle handle; - acpi_status status; - - if (!adap->dev.parent) - return; - - handle = ACPI_HANDLE(adap->dev.parent); - if (!handle) - return; - - status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, - acpi_i2c_add_device, NULL, - adap, NULL); - if (ACPI_FAILURE(status)) - dev_warn(&adap->dev, "failed to enumerate I2C slaves\n"); -} -#else -static inline void acpi_i2c_register_devices(struct i2c_adapter *adap) {} -#endif /* CONFIG_ACPI */ - static int i2c_do_add_adapter(struct i2c_driver *driver, struct i2c_adapter *adap) { diff --git a/include/linux/i2c.h b/include/linux/i2c.h index f7a939a..ea50766 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -577,10 +577,12 @@ static inline struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node } #endif /* CONFIG_OF */ -#ifdef CONFIG_ACPI +#ifdef CONFIG_I2C_ACPI int acpi_i2c_install_space_handler(struct i2c_adapter *adapter); void acpi_i2c_remove_space_handler(struct i2c_adapter *adapter); +void acpi_i2c_register_devices(struct i2c_adapter *adap); #else +static inline void acpi_i2c_register_devices(struct i2c_adapter *adap) { } static inline void acpi_i2c_remove_space_handler(struct i2c_adapter *adapter) { } static inline int acpi_i2c_install_space_handler(struct i2c_adapter *adapter)