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Subject[PATCH v3 2/2] dell-laptop: Expose auxiliary MAC address if available
Date
System with Type-C ports have a feature to expose an auxiliary
persistent MAC address. This address is burned in at the
factory.

The intention of this address is to update the MAC address on
Type-C docks containing an ethernet adapter to match the
auxiliary address of the system connected to them.

Signed-off-by: Mario Limonciello <mario_limonciello@dell.com>
---
drivers/platform/x86/dell-laptop.c | 61 +++++++++++++++++++++++++++++++++++++-
1 file changed, 60 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
index 2c2f02b..7d29690 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -87,6 +87,7 @@ static struct rfkill *wifi_rfkill;
static struct rfkill *bluetooth_rfkill;
static struct rfkill *wwan_rfkill;
static bool force_rfkill;
+static char *auxiliary_mac_address;

module_param(force_rfkill, bool, 0444);
MODULE_PARM_DESC(force_rfkill, "enable rfkill on non whitelisted models");
@@ -273,6 +274,54 @@ static const struct dmi_system_id dell_quirks[] __initconst = {
{ }
};

+/* get_aux_mac
+ * returns the auxiliary mac address
+ * for assigning to a Type-C ethernet device
+ * such as that found in the Dell TB15 dock
+ */
+static int get_aux_mac(void)
+{
+ struct calling_interface_buffer *buffer;
+ unsigned char *extended_buffer;
+ size_t length;
+ int ret;
+
+ buffer = dell_smbios_get_buffer();
+ length = 17;
+ extended_buffer = dell_smbios_send_extended_request(11, 6, &length);
+ ret = buffer->output[0];
+ if (ret != 0 || !extended_buffer) {
+ pr_debug("get_aux_mac: ext buffer: %p, len: %lu, ret: %d\n",
+ extended_buffer, length, ret);
+ auxiliary_mac_address = NULL;
+ goto auxout;
+ }
+
+ /* address will be stored in byte 4-> */
+ auxiliary_mac_address = kmalloc(length, GFP_KERNEL);
+ memcpy(auxiliary_mac_address, extended_buffer, length);
+
+ auxout:
+ dell_smbios_release_buffer();
+ return dell_smbios_error(ret);
+}
+
+static ssize_t auxiliary_mac_show(struct device *dev,
+ struct device_attribute *attr, char *page)
+{
+ return sprintf(page, "%s\n", auxiliary_mac_address);
+}
+
+static DEVICE_ATTR_RO(auxiliary_mac);
+static struct attribute *dell_attributes[] = {
+ &dev_attr_auxiliary_mac.attr,
+ NULL
+};
+
+static const struct attribute_group dell_attr_group = {
+ .attrs = dell_attributes,
+};
+
/*
* Derived from information in smbios-wireless-ctl:
*
@@ -392,7 +441,6 @@ static const struct dmi_system_id dell_quirks[] __initconst = {
* cbArg1, byte0 = 0x13
* cbRes1 Standard return codes (0, -1, -2)
*/
-
static int dell_rfkill_set(void *data, bool blocked)
{
struct calling_interface_buffer *buffer;
@@ -2003,6 +2051,12 @@ static int __init dell_init(void)
goto fail_rfkill;
}

+ ret = get_aux_mac();
+ if (!ret) {
+ sysfs_create_group(&platform_device->dev.kobj,
+ &dell_attr_group);
+ }
+
if (quirks && quirks->touchpad_led)
touchpad_led_init(&platform_device->dev);

@@ -2064,6 +2118,11 @@ fail_platform_driver:

static void __exit dell_exit(void)
{
+ if (auxiliary_mac_address) {
+ sysfs_remove_group(&platform_device->dev.kobj,
+ &dell_attr_group);
+ kfree(auxiliary_mac_address);
+ }
debugfs_remove_recursive(dell_laptop_dir);
if (quirks && quirks->touchpad_led)
touchpad_led_exit();
--
2.7.4
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