Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753499Ab2HDMPR (ORCPT ); Sat, 4 Aug 2012 08:15:17 -0400 Received: from szxga01-in.huawei.com ([119.145.14.64]:17580 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752712Ab2HDMPG (ORCPT ); Sat, 4 Aug 2012 08:15:06 -0400 From: Jiang Liu To: Yinghai Lu , Yasuaki Ishimatsu , Kenji Kaneshige , Wen Congyang , Tang Chen , Taku Izumi CC: Jiang Liu , Tony Luck , Huang Ying , Bob Moore , Len Brown , "Srivatsa S. Bhat" , Bjorn Helgaas , , , , Jiang Liu Subject: [RFC PATCH v2 15/16] ACPIHP: implement ACPI hotplug sysfs interfaces Date: Sat, 4 Aug 2012 20:14:02 +0800 Message-ID: <1344082443-4608-16-git-send-email-jiang.liu@huawei.com> X-Mailer: git-send-email 1.7.11.msysgit.1 In-Reply-To: <1344082443-4608-1-git-send-email-jiang.liu@huawei.com> References: <1344082443-4608-1-git-send-email-jiang.liu@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.108.108.229] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 10373 Lines: 335 From: Jiang Liu This patch implements ACPI hotplug sysfs interfaces for system device hotplug. enable: (It should be named 'power', but that causes name conflicts.) echo 1 > enable: power on the hotplug slot. echo 0 > enable: power off the hotplug slot. connect: echo 1 > connect: create ACPI devices for system devices connecting to a slot echo 0 > connect: remove ACPI devices for system devices connecting to a slot configure: echo 1 > configure: add system devices into running system echo 0 > configure: remove system devices from running system dependency: cat dependency: show slots have dependency on this slot if the slot is powered, otherwise show slots this slot depends on. Signed-off-by: Jiang Liu --- drivers/acpi/hotplug/Makefile | 1 + drivers/acpi/hotplug/acpihp_drv.h | 3 + drivers/acpi/hotplug/drv_main.c | 6 + drivers/acpi/hotplug/sysfs.c | 246 +++++++++++++++++++++++++++++++++++++ 4 files changed, 256 insertions(+) create mode 100644 drivers/acpi/hotplug/sysfs.c diff --git a/drivers/acpi/hotplug/Makefile b/drivers/acpi/hotplug/Makefile index 9383320..88c7595 100644 --- a/drivers/acpi/hotplug/Makefile +++ b/drivers/acpi/hotplug/Makefile @@ -15,3 +15,4 @@ acpihp_drv-y += dependency.o acpihp_drv-y += cancel.o acpihp_drv-y += configure.o acpihp_drv-y += state_machine.o +acpihp_drv-y += sysfs.o diff --git a/drivers/acpi/hotplug/acpihp_drv.h b/drivers/acpi/hotplug/acpihp_drv.h index 3b6dbdd..d339f9a 100644 --- a/drivers/acpi/hotplug/acpihp_drv.h +++ b/drivers/acpi/hotplug/acpihp_drv.h @@ -101,4 +101,7 @@ int acpihp_drv_unconfigure(struct list_head *list); /* The heart of the ACPI system device hotplug driver */ int acpihp_drv_change_state(struct acpihp_slot *slot, enum acpihp_drv_cmd cmd); +int acpihp_drv_create_sysfs(struct acpihp_slot *slot); +void acpihp_drv_remove_sysfs(struct acpihp_slot *slot); + #endif /* __ACPIHP_DRV_H__ */ diff --git a/drivers/acpi/hotplug/drv_main.c b/drivers/acpi/hotplug/drv_main.c index 538772d..9858fdd 100644 --- a/drivers/acpi/hotplug/drv_main.c +++ b/drivers/acpi/hotplug/drv_main.c @@ -280,6 +280,11 @@ static int acpihp_drv_slot_add(struct device *dev, struct class_interface *intf) return -ENOMEM; } + if (acpihp_drv_create_sysfs(slot)) + ACPIHP_DEBUG("fails to create sysfs interfaces for slot %s, " + "some function will not be available to user.\n", + slot->name); + ACPIHP_INFO("found hotplug slot %s.\n", slot->full_path); return 0; @@ -294,6 +299,7 @@ static void acpihp_drv_intf_remove(struct device *dev, ACPIHP_INFO("remove hotplug slot %s.\n", slot->full_path); + acpihp_drv_remove_sysfs(slot); acpihp_drv_uninstall_handler(slot); acpihp_drv_remove_devices(slot); acpihp_slot_detach_drv_data(slot, intf, (void **)&drv_data); diff --git a/drivers/acpi/hotplug/sysfs.c b/drivers/acpi/hotplug/sysfs.c new file mode 100644 index 0000000..62c1892 --- /dev/null +++ b/drivers/acpi/hotplug/sysfs.c @@ -0,0 +1,246 @@ +/* + * Copyright (C) 2011 Huawei Tech. Co., Ltd. + * Copyright (C) 2011 Jiang Liu + * Copyright (C) 2011 Hanjun Guo + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + */ + +#include +#include +#include +#include "acpihp_drv.h" + +static ssize_t acpihp_drv_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count, + enum acpihp_drv_cmd op_set, enum acpihp_drv_cmd op_clr) +{ + unsigned long val; + ssize_t result = kstrtoul(buf, 0, &val); + struct acpihp_slot *slot = container_of(dev, struct acpihp_slot, dev); + + if (result < 0) + return result; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (val) + result = acpihp_drv_change_state(slot, op_set); + else + result = acpihp_drv_change_state(slot, op_clr); + + return result < 0 ? result : count; +} + +static inline ssize_t acpihp_drv_print_bool(char *page, bool flag) +{ + return snprintf(page, PAGE_SIZE, flag ? "1\n" : "0\n"); +} + +static ssize_t acpihp_drv_power_show(struct device *dev, + struct device_attribute *attr, char *page) +{ + bool flag; + struct acpihp_slot *slot = container_of(dev, struct acpihp_slot, dev); + + acpihp_drv_update_slot_state(slot); + mutex_lock(&slot->slot_mutex); + switch (slot->state) { + case ACPIHP_SLOT_STATE_POWERED: + case ACPIHP_SLOT_STATE_CONNECTED: + case ACPIHP_SLOT_STATE_CONFIGURED: + case ACPIHP_SLOT_STATE_POWERING_ON: + case ACPIHP_SLOT_STATE_POWERING_OFF: + case ACPIHP_SLOT_STATE_CONNECTING: + case ACPIHP_SLOT_STATE_DISCONNECTING: + case ACPIHP_SLOT_STATE_CONFIGURING: + case ACPIHP_SLOT_STATE_UNCONFIGURING: + flag = true; + break; + default: + flag = false; + break; + } + mutex_unlock(&slot->slot_mutex); + + return acpihp_drv_print_bool(page, flag); +} + +static ssize_t acpihp_drv_power_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + return acpihp_drv_store(dev, attr, buf, count, + ACPIHP_DRV_CMD_POWERON, ACPIHP_DRV_CMD_POWEROFF); +} + +/* It should be named as 'power', but that will cause name conflics. */ +DEVICE_ATTR(enable, S_IRUSR | S_IWUSR, + &acpihp_drv_power_show, &acpihp_drv_power_store); + +static ssize_t acpihp_drv_connect_show(struct device *dev, + struct device_attribute *attr, char *page) +{ + bool flag; + struct acpihp_slot *slot = container_of(dev, struct acpihp_slot, dev); + + acpihp_drv_update_slot_state(slot); + mutex_lock(&slot->slot_mutex); + switch (slot->state) { + case ACPIHP_SLOT_STATE_CONNECTED: + case ACPIHP_SLOT_STATE_CONFIGURED: + case ACPIHP_SLOT_STATE_CONNECTING: + case ACPIHP_SLOT_STATE_DISCONNECTING: + case ACPIHP_SLOT_STATE_CONFIGURING: + case ACPIHP_SLOT_STATE_UNCONFIGURING: + flag = true; + break; + default: + flag = false; + break; + } + mutex_unlock(&slot->slot_mutex); + + return acpihp_drv_print_bool(page, flag); +} + +static ssize_t acpihp_drv_connect_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + return acpihp_drv_store(dev, attr, buf, count, + ACPIHP_DRV_CMD_CONNECT, ACPIHP_DRV_CMD_DISCONNECT); +} + +DEVICE_ATTR(connect, S_IRUSR | S_IWUSR, + &acpihp_drv_connect_show, &acpihp_drv_connect_store); + +static ssize_t acpihp_drv_configure_show(struct device *dev, + struct device_attribute *attr, char *page) +{ + bool flag; + struct acpihp_slot *slot = container_of(dev, struct acpihp_slot, dev); + + acpihp_drv_update_slot_state(slot); + mutex_lock(&slot->slot_mutex); + switch (slot->state) { + case ACPIHP_SLOT_STATE_CONFIGURED: + case ACPIHP_SLOT_STATE_CONFIGURING: + case ACPIHP_SLOT_STATE_UNCONFIGURING: + flag = true; + break; + default: + flag = false; + break; + } + mutex_unlock(&slot->slot_mutex); + + return acpihp_drv_print_bool(page, flag); +} + +static ssize_t acpihp_drv_configure_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + return acpihp_drv_store(dev, attr, buf, count, + ACPIHP_DRV_CMD_CONFIGURE, ACPIHP_DRV_CMD_UNCONFIGURE); +} + +DEVICE_ATTR(configure, S_IRUSR | S_IWUSR, + &acpihp_drv_configure_show, &acpihp_drv_configure_store); + +static ssize_t acpihp_drv_dependency_show(struct device *dev, + struct device_attribute *attr, char *page) +{ + int ret; + char *p, *end; + struct list_head list; + enum acpihp_drv_cmd cmd; + struct acpihp_slot_dependency *dep; + struct acpihp_slot *slot = container_of(dev, struct acpihp_slot, dev); + + INIT_LIST_HEAD(&list); + mutex_lock(&state_machine_mutex); + cmd = acpihp_slot_powered(slot) ? ACPIHP_DRV_CMD_POWEROFF : + ACPIHP_DRV_CMD_POWERON; + ret = acpihp_drv_generate_dependency_list(slot, &list, cmd); + if (ret) { + ret = -ENXIO; + } else { + p = page; + end = page + PAGE_SIZE; + + list_for_each_entry(dep, &list, node) { + if (dep->slot == slot) + continue; + if (p + strlen(dep->slot->full_path) + 2 >= end) + break; + p += snprintf(p, end - p, "%s\n", dep->slot->full_path); + } + + acpihp_drv_destroy_dependency_list(&list); + ret = p - page; + } + mutex_unlock(&state_machine_mutex); + + return ret; +} + +static DEVICE_ATTR(dependency, S_IRUSR | S_IWUSR, + &acpihp_drv_dependency_show, NULL); + +int acpihp_drv_create_sysfs(struct acpihp_slot *slot) +{ + int retval; + struct device *dev = &slot->dev; + + retval = device_create_file(dev, &dev_attr_enable); + if (retval) + goto out; + retval = device_create_file(dev, &dev_attr_connect); + if (retval) + goto out1; + retval = device_create_file(dev, &dev_attr_configure); + if (retval) + goto out2; + retval = device_create_file(dev, &dev_attr_dependency); + if (retval) + goto out3; + + return 0; + +out3: + device_remove_file(dev, &dev_attr_configure); +out2: + device_remove_file(dev, &dev_attr_connect); +out1: + device_remove_file(dev, &dev_attr_enable); +out: + ACPIHP_DEBUG("fails to create sysfs interfaces for slot %s.\n", + slot->name); + return retval; +} + +void acpihp_drv_remove_sysfs(struct acpihp_slot *slot) +{ + struct device *dev = &slot->dev; + + device_remove_file(dev, &dev_attr_dependency); + device_remove_file(dev, &dev_attr_configure); + device_remove_file(dev, &dev_attr_connect); + device_remove_file(dev, &dev_attr_enable); +} -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/