drivers/firmware/dmi-id.c
Source file repositories/reference/linux-study-clean/drivers/firmware/dmi-id.c
File Facts
- System
- Linux kernel
- Corpus path
drivers/firmware/dmi-id.c- Extension
.c- Size
- 7480 bytes
- Lines
- 266
- Domain
- Driver Families
- Bucket
- drivers/firmware
- Inferred role
- Driver Families: implementation source
- Status
- source implementation candidate
Why This File Exists
Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
- Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
- Allocates kernel memory; connect allocation flags and lifetime to context constraints.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/module.hlinux/kernel.hlinux/init.hlinux/dmi.hlinux/device.hlinux/slab.h
Detected Declarations
struct dmi_device_attributefunction sys_dmi_field_showfunction ascii_filterfunction get_modaliasfunction sys_dmi_modalias_showfunction dmi_dev_ueventfunction dmi_dev_releasefunction dmi_id_init_attr_tablefunction dmi_id_init
Annotated Snippet
struct dmi_device_attribute{
struct device_attribute dev_attr;
int field;
};
#define to_dmi_dev_attr(_dev_attr) \
container_of(_dev_attr, struct dmi_device_attribute, dev_attr)
static ssize_t sys_dmi_field_show(struct device *dev,
struct device_attribute *attr,
char *page)
{
int field = to_dmi_dev_attr(attr)->field;
ssize_t len;
len = scnprintf(page, PAGE_SIZE, "%s\n", dmi_get_system_info(field));
page[len-1] = '\n';
return len;
}
#define DMI_ATTR(_name, _mode, _show, _field) \
{ .dev_attr = __ATTR(_name, _mode, _show, NULL), \
.field = _field }
#define DEFINE_DMI_ATTR_WITH_SHOW(_name, _mode, _field) \
static struct dmi_device_attribute sys_dmi_##_name##_attr = \
DMI_ATTR(_name, _mode, sys_dmi_field_show, _field);
DEFINE_DMI_ATTR_WITH_SHOW(bios_vendor, 0444, DMI_BIOS_VENDOR);
DEFINE_DMI_ATTR_WITH_SHOW(bios_version, 0444, DMI_BIOS_VERSION);
DEFINE_DMI_ATTR_WITH_SHOW(bios_date, 0444, DMI_BIOS_DATE);
DEFINE_DMI_ATTR_WITH_SHOW(sys_vendor, 0444, DMI_SYS_VENDOR);
DEFINE_DMI_ATTR_WITH_SHOW(bios_release, 0444, DMI_BIOS_RELEASE);
DEFINE_DMI_ATTR_WITH_SHOW(ec_firmware_release, 0444, DMI_EC_FIRMWARE_RELEASE);
DEFINE_DMI_ATTR_WITH_SHOW(product_name, 0444, DMI_PRODUCT_NAME);
DEFINE_DMI_ATTR_WITH_SHOW(product_version, 0444, DMI_PRODUCT_VERSION);
DEFINE_DMI_ATTR_WITH_SHOW(product_serial, 0400, DMI_PRODUCT_SERIAL);
DEFINE_DMI_ATTR_WITH_SHOW(product_uuid, 0400, DMI_PRODUCT_UUID);
DEFINE_DMI_ATTR_WITH_SHOW(product_sku, 0444, DMI_PRODUCT_SKU);
DEFINE_DMI_ATTR_WITH_SHOW(product_family, 0444, DMI_PRODUCT_FAMILY);
DEFINE_DMI_ATTR_WITH_SHOW(board_vendor, 0444, DMI_BOARD_VENDOR);
DEFINE_DMI_ATTR_WITH_SHOW(board_name, 0444, DMI_BOARD_NAME);
DEFINE_DMI_ATTR_WITH_SHOW(board_version, 0444, DMI_BOARD_VERSION);
DEFINE_DMI_ATTR_WITH_SHOW(board_serial, 0400, DMI_BOARD_SERIAL);
DEFINE_DMI_ATTR_WITH_SHOW(board_asset_tag, 0444, DMI_BOARD_ASSET_TAG);
DEFINE_DMI_ATTR_WITH_SHOW(chassis_vendor, 0444, DMI_CHASSIS_VENDOR);
DEFINE_DMI_ATTR_WITH_SHOW(chassis_type, 0444, DMI_CHASSIS_TYPE);
DEFINE_DMI_ATTR_WITH_SHOW(chassis_version, 0444, DMI_CHASSIS_VERSION);
DEFINE_DMI_ATTR_WITH_SHOW(chassis_serial, 0400, DMI_CHASSIS_SERIAL);
DEFINE_DMI_ATTR_WITH_SHOW(chassis_asset_tag, 0444, DMI_CHASSIS_ASSET_TAG);
static void ascii_filter(char *d, const char *s)
{
/* Filter out characters we don't want to see in the modalias string */
for (; *s; s++)
if (*s > ' ' && *s < 127 && *s != ':')
*(d++) = *s;
*d = 0;
}
static ssize_t get_modalias(char *buffer, size_t buffer_size)
{
/*
* Note new fields need to be added at the end to keep compatibility
* with udev's hwdb which does matches on "`cat dmi/id/modalias`*".
*/
static const struct mafield {
const char *prefix;
int field;
} fields[] = {
{ "bvn", DMI_BIOS_VENDOR },
{ "bvr", DMI_BIOS_VERSION },
{ "bd", DMI_BIOS_DATE },
{ "br", DMI_BIOS_RELEASE },
{ "efr", DMI_EC_FIRMWARE_RELEASE },
{ "svn", DMI_SYS_VENDOR },
{ "pn", DMI_PRODUCT_NAME },
{ "pvr", DMI_PRODUCT_VERSION },
{ "rvn", DMI_BOARD_VENDOR },
{ "rn", DMI_BOARD_NAME },
{ "rvr", DMI_BOARD_VERSION },
{ "cvn", DMI_CHASSIS_VENDOR },
{ "ct", DMI_CHASSIS_TYPE },
{ "cvr", DMI_CHASSIS_VERSION },
{ "sku", DMI_PRODUCT_SKU },
{ "pfa", DMI_PRODUCT_FAMILY },
{ NULL, DMI_NONE }
};
ssize_t l, left;
char *p;
Annotation
- Immediate include surface: `linux/module.h`, `linux/kernel.h`, `linux/init.h`, `linux/dmi.h`, `linux/device.h`, `linux/slab.h`.
- Detected declarations: `struct dmi_device_attribute`, `function sys_dmi_field_show`, `function ascii_filter`, `function get_modalias`, `function sys_dmi_modalias_show`, `function dmi_dev_uevent`, `function dmi_dev_release`, `function dmi_id_init_attr_table`, `function dmi_id_init`.
- Atlas domain: Driver Families / drivers/firmware.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.