From patchwork Fri Jul 16 11:11:31 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Renninger X-Patchwork-Id: 112403 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter.kernel.org (8.14.4/8.14.3) with ESMTP id o6GBCkiO025226 for ; Fri, 16 Jul 2010 11:12:47 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965206Ab0GPLMe (ORCPT ); Fri, 16 Jul 2010 07:12:34 -0400 Received: from cantor2.suse.de ([195.135.220.15]:43434 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965151Ab0GPLLm (ORCPT ); Fri, 16 Jul 2010 07:11:42 -0400 Received: from relay2.suse.de (charybdis-ext.suse.de [195.135.221.2]) by mx2.suse.de (Postfix) with ESMTP id 51B4F86EE4; Fri, 16 Jul 2010 13:11:41 +0200 (CEST) From: Thomas Renninger To: lenb@kernel.org Cc: linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org, Thomas Renninger , Alexey Starikovskiy , Bjorn Helgaas Subject: [PATCH 1/7] ACPI: Provide /sys/kernel/debug/ec/... Date: Fri, 16 Jul 2010 13:11:31 +0200 Message-Id: <1279278697-3694-2-git-send-email-trenn@suse.de> X-Mailer: git-send-email 1.6.3 In-Reply-To: <1279278697-3694-1-git-send-email-trenn@suse.de> References: <1279278697-3694-1-git-send-email-trenn@suse.de> Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter.kernel.org [140.211.167.41]); Fri, 16 Jul 2010 11:12:47 +0000 (UTC) diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index 7464115..f7226d1 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -104,6 +104,19 @@ config ACPI_SYSFS_POWER help Say N to disable power /sys interface +config ACPI_EC_DEBUGFS + tristate "EC read/write access through /sys/kernel/debug/ec" + default y + help + Say N to disable Embedded Controller /sys/kernel/debug interface + + An Embedded Controller typically is available on laptops and reads + sensor values like battery state and temperature. + The kernel access the EC through ACPI parsed code provided by BIOS + tables. + Thus this option is a debug option that helps to write ACPI drivers + and can be used to identify ACPI code or EC firmware bugs. + config ACPI_PROC_EVENT bool "Deprecated /proc/acpi/event support" depends on PROC_FS diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index 6ee3316..833b582 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -60,6 +60,7 @@ obj-$(CONFIG_ACPI_SBS) += sbshc.o obj-$(CONFIG_ACPI_SBS) += sbs.o obj-$(CONFIG_ACPI_POWER_METER) += power_meter.o obj-$(CONFIG_ACPI_HED) += hed.o +obj-$(CONFIG_ACPI_EC_DEBUGFS) += ec_sys.o # processor has its own "processor." module_param namespace processor-y := processor_driver.o processor_throttling.o diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index 1e6d418..4b6759f 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -45,10 +45,13 @@ #include #include +#include "internal.h" + #define ACPI_EC_CLASS "embedded_controller" #define ACPI_EC_DEVICE_NAME "Embedded Controller" #define ACPI_EC_FILE_INFO "info" +#undef PREFIX #define PREFIX "ACPI: EC: " /* EC status register */ @@ -106,19 +109,8 @@ struct transaction { bool done; }; -static struct acpi_ec { - acpi_handle handle; - unsigned long gpe; - unsigned long command_addr; - unsigned long data_addr; - unsigned long global_lock; - unsigned long flags; - struct mutex lock; - wait_queue_head_t wait; - struct list_head list; - struct transaction *curr; - spinlock_t curr_lock; -} *boot_ec, *first_ec; +struct acpi_ec *boot_ec, *first_ec; +EXPORT_SYMBOL(first_ec); static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */ static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */ diff --git a/drivers/acpi/ec_sys.c b/drivers/acpi/ec_sys.c new file mode 100644 index 0000000..834c21a --- /dev/null +++ b/drivers/acpi/ec_sys.c @@ -0,0 +1,57 @@ +#include +#include +#include +#include "internal.h" + +MODULE_AUTHOR("Thomas Renninger "); +MODULE_DESCRIPTION("ACPI EC sysfs access driver"); +MODULE_LICENSE("GPL"); + +struct sysdev_class acpi_ec_sysdev_class = { + .name = "ec", +}; + +static struct dentry *acpi_ec_debugfs_dir; + +int acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count) +{ + struct dentry *dev_dir; + char name[64]; + if (ec_device_count == 0) { + acpi_ec_debugfs_dir = debugfs_create_dir("ec", NULL); + if (!acpi_ec_debugfs_dir) + return -ENOMEM; + } + + sprintf(name, "ec%u", ec_device_count); + dev_dir = debugfs_create_dir(name, acpi_ec_debugfs_dir); + if (!dev_dir) { + if (ec_device_count == 0) + debugfs_remove_recursive(acpi_ec_debugfs_dir); + /* TBD: Proper cleanup for multiple ECs */ + return -ENOMEM; + } + + debugfs_create_x32("gpe", 0444, dev_dir, (u32 *)&first_ec->gpe); + debugfs_create_bool("use_global_lock", 0444, dev_dir, + (u32 *)&first_ec->global_lock); + return 0; +} + +static int __init acpi_ec_sys_init(void) +{ + int err = 0; + if (first_ec) + err = acpi_ec_add_debugfs(first_ec, 0); + else + err = -ENODEV; + return err; +} + +static void __exit acpi_ec_sys_exit(void) +{ + debugfs_remove_recursive(acpi_ec_debugfs_dir); +} + +module_init(acpi_ec_sys_init); +module_exit(acpi_ec_sys_exit); diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h index f8f190e..8ae2726 100644 --- a/drivers/acpi/internal.h +++ b/drivers/acpi/internal.h @@ -18,6 +18,11 @@ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. */ +#ifndef _ACPI_INTERNAL_H_ +#define _ACPI_INTERNAL_H_ + +#include + #define PREFIX "ACPI: " int init_acpi_device_notify(void); @@ -46,6 +51,23 @@ void acpi_early_processor_set_pdc(void); /* -------------------------------------------------------------------------- Embedded Controller -------------------------------------------------------------------------- */ +struct acpi_ec { + acpi_handle handle; + unsigned long gpe; + unsigned long command_addr; + unsigned long data_addr; + unsigned long global_lock; + unsigned long flags; + struct mutex lock; + wait_queue_head_t wait; + struct list_head list; + struct transaction *curr; + spinlock_t curr_lock; + struct sys_device sysdev; +}; + +extern struct acpi_ec *first_ec; + int acpi_ec_init(void); int acpi_ec_ecdt_probe(void); int acpi_boot_ec_enable(void); @@ -63,3 +85,5 @@ int acpi_sleep_proc_init(void); #else static inline int acpi_sleep_proc_init(void) { return 0; } #endif + +#endif /* _ACPI_INTERNAL_H_ */