Common base to export System-on-Chip related informations through sysfs. Creation of a "socinfo" directory under /sys/. Creation of SoC information entries.
Signed-off-by: Maxime COQUELIN <[email protected]> --- Documentation/ABI/testing/sysfs-socinfo | 16 ++++++ drivers/base/Kconfig | 3 + drivers/base/Makefile | 1 + drivers/base/soc.c | 79 +++++++++++++++++++++++++++++++ include/linux/sys_soc.h | 50 +++++++++++++++++++ 5 files changed, 149 insertions(+), 0 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-socinfo create mode 100644 drivers/base/soc.c create mode 100644 include/linux/sys_soc.h diff --git a/Documentation/ABI/testing/sysfs-socinfo b/Documentation/ABI/testing/sysfs-socinfo new file mode 100644 index 0000000..afd9da2 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-socinfo @@ -0,0 +1,16 @@ +What: /sys/socinfo +Date: March 2011 +contact: Maxime Coquelin <[email protected]> +Description: + The /sys/socinfo directory contains information about the + System-on-Chip. It is only available if platform implements it. + This directory contains two kind of attributes : + - common attributes: + * machine: the name of the machine. + * family: the family name of the SoC + - SoC-specific attributes: The SoC vendor can declare attributes + to export some strings to user-space, like the serial-number for + example. + +Users: + User-space applications which needs these kind of attributes. diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig index d57e8d0..372ef3a 100644 --- a/drivers/base/Kconfig +++ b/drivers/base/Kconfig @@ -168,4 +168,7 @@ config SYS_HYPERVISOR bool default n +config SYS_SOC + bool + endmenu diff --git a/drivers/base/Makefile b/drivers/base/Makefile index 5f51c3b..f3bcfb3 100644 --- a/drivers/base/Makefile +++ b/drivers/base/Makefile @@ -18,6 +18,7 @@ ifeq ($(CONFIG_SYSFS),y) obj-$(CONFIG_MODULES) += module.o endif obj-$(CONFIG_SYS_HYPERVISOR) += hypervisor.o +obj-$(CONFIG_SYS_SOC) += soc.o ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG diff --git a/drivers/base/soc.c b/drivers/base/soc.c new file mode 100644 index 0000000..046b43b --- /dev/null +++ b/drivers/base/soc.c @@ -0,0 +1,79 @@ +/* + * Copyright (C) ST-Ericsson SA 2011 + * Author: Maxime Coquelin <[email protected]> for ST-Ericsson. + * License terms: GNU General Public License (GPL), version 2 + */ + +#include <linux/sysfs.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/stat.h> +#include <linux/slab.h> +#include <linux/sys_soc.h> + +struct kobject *soc_object; + +ssize_t show_soc_info(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct sysfs_soc_info *si = container_of(attr, + struct sysfs_soc_info, attr); + + if (si->info) + return sprintf(buf, "%s\n", si->info); + + return si->get_info(buf, si); +} + +int __init register_sysfs_soc_info(struct sysfs_soc_info *info, int nb_info) +{ + int i, ret; + + for (i = 0; i < nb_info; i++) { + ret = sysfs_create_file(soc_object, &info[i].attr.attr); + if (ret) { + for (i -= 1; i >= 0; i--) + sysfs_remove_file(soc_object, &info[i].attr.attr); + break; + } + } + + return ret; +} + +static struct attribute *soc_attrs[] = { + NULL, +}; + +static struct attribute_group soc_attr_group = { + .attrs = soc_attrs, +}; + +int __init register_sysfs_soc(struct sysfs_soc_info *info, size_t num) +{ + int ret; + + soc_object = kobject_create_and_add("socinfo", NULL); + if (!soc_object) { + ret = -ENOMEM; + goto exit; + } + + ret = sysfs_create_group(soc_object, &soc_attr_group); + if (ret) + goto kset_exit; + + ret = register_sysfs_soc_info(info, num); + if (ret) + goto group_exit; + + return 0; + +group_exit: + sysfs_remove_group(soc_object, &soc_attr_group); +kset_exit: + kobject_put(soc_object); +exit: + return ret; +} + diff --git a/include/linux/sys_soc.h b/include/linux/sys_soc.h new file mode 100644 index 0000000..05e5529 --- /dev/null +++ b/include/linux/sys_soc.h @@ -0,0 +1,50 @@ +/* + * Copyright (C) ST-Ericsson SA 2011 + * Author: Maxime Coquelin <[email protected]> for ST-Ericsson. + * License terms: GNU General Public License (GPL), version 2 + */ +#ifndef __SYS_SOC_H +#define __SYS_SOC_H + +#include <linux/kobject.h> + +/** + * struct sys_soc_info - SoC exports related informations + * @name: name of the export + * @info: pointer on the key to export + * @get_info: callback to retrieve key if info field is NULL + * @attr: export's sysdev class attribute + */ +struct sysfs_soc_info { + const char *info; + ssize_t (*get_info)(char *buf, struct sysfs_soc_info *); + struct kobj_attribute attr; +}; + +ssize_t show_soc_info(struct kobject *, struct kobj_attribute *, char *); + +#define SYSFS_SOC_ATTR_VALUE(_name, _value) { \ + .attr.attr.name = _name, \ + .attr.attr.mode = S_IRUGO, \ + .attr.show = show_soc_info, \ + .info = _value, \ +} + +#define SYSFS_SOC_ATTR_CALLBACK(_name, _callback) { \ + .attr.attr.name = _name, \ + .attr.attr.mode = S_IRUGO, \ + .attr.show = show_soc_info, \ + .get_info = _callback, \ +} + +/** + * register_sys_soc - register the soc information + * @name: name of the machine + * @info: pointer on the info table to export + * @num: number of info to export + * + * NOTE: This function must only be called once + */ +int register_sysfs_soc(struct sysfs_soc_info *info, size_t num); + +#endif /* __SYS_SOC_H */ -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
