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charset="utf-8" Newer Thinkpads have a feature called Mac Address Passthrough. This patch provides a sysfs interface that userspace can use to get this auxiliary mac address. Signed-off-by: Fernando Eckhardt Valle --- drivers/platform/x86/thinkpad_acpi.c | 77 ++++++++++++++++++++++++++++ 1 file changed, 77 insertions(+) diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/th= inkpad_acpi.c index d70c89d32..0b1c36b0d 100644 --- a/drivers/platform/x86/thinkpad_acpi.c +++ b/drivers/platform/x86/thinkpad_acpi.c @@ -10785,6 +10785,78 @@ static struct ibm_struct dprc_driver_data =3D { .name =3D "dprc", }; =20 +/* + * Auxmac + * + * This auxiliary mac address is enabled in the bios through the + * Mac Address Passthrough feature. In most cases, there are three + * possibilities: Internal Mac, Second Mac, and disabled. + * + */ + +#define AUXMAC_LEN 12 +#define AUXMAC_START 9 +#define AUXMAC_STRLEN 22 +static char auxmac[AUXMAC_LEN]; + +static int auxmac_init(struct ibm_init_struct *iibm) +{ + acpi_status status; + struct acpi_buffer buffer =3D { ACPI_ALLOCATE_BUFFER, NULL }; + union acpi_object *obj; + + status =3D acpi_evaluate_object(NULL, "\\MACA", NULL, &buffer); + + if (ACPI_FAILURE(status)) + return -ENODEV; + + obj =3D (union acpi_object *)buffer.pointer; + + if (obj->type !=3D ACPI_TYPE_STRING || obj->string.length !=3D AUXMAC_STR= LEN) { + pr_info("Invalid buffer for mac addr passthrough.\n"); + goto auxmacinvalid; + } + + if (strncmp(obj->string.pointer + 0x8, "#", 1) !=3D 0 || + strncmp(obj->string.pointer + 0x15, "#", 1) !=3D 0) { + pr_info("Invalid header for mac addr passthrough.\n"); + goto auxmacinvalid; + } + + memcpy(auxmac, obj->string.pointer + AUXMAC_START, AUXMAC_LEN); + kfree(obj); + return 0; + +auxmacinvalid: + kfree(obj); + memcpy(auxmac, "unavailable", 11); + return 0; +} + +static struct ibm_struct auxmac_data =3D { + .name =3D "auxmac", +}; + +static ssize_t auxmac_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + if (strncmp(auxmac, "XXXXXXXXXXXX", AUXMAC_LEN) =3D=3D 0) + memcpy(auxmac, "disabled", 9); + + return sysfs_emit(buf, "%s\n", auxmac); +} +static DEVICE_ATTR_RO(auxmac); + +static struct attribute *auxmac_attributes[] =3D { + &dev_attr_auxmac.attr, + NULL +}; + +static const struct attribute_group auxmac_attr_group =3D { + .attrs =3D auxmac_attributes, +}; + /* --------------------------------------------------------------------- */ =20 static struct attribute *tpacpi_driver_attributes[] =3D { @@ -10843,6 +10915,7 @@ static const struct attribute_group *tpacpi_groups[= ] =3D { &proxsensor_attr_group, &kbdlang_attr_group, &dprc_attr_group, + &auxmac_attr_group, NULL, }; =20 @@ -11414,6 +11487,10 @@ static struct ibm_init_struct ibms_init[] __initda= ta =3D { .init =3D tpacpi_dprc_init, .data =3D &dprc_driver_data, }, + { + .init =3D auxmac_init, + .data =3D &auxmac_data, + }, }; =20 static int __init set_ibm_param(const char *val, const struct kernel_param= *kp) --=20 2.25.1