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thunderbolt: Read vendor and device name from DROM

Browse source 
The device DROM contains name of the vendor and device among other
things. Extract this information and expose it to the userspace via two
new attributes.

Signed-off-by: Mika Westerberg <[email protected]>
Reviewed-by: Yehezkel Bernat <[email protected]>
Reviewed-by: Michael Jamet <[email protected]>
Signed-off-by: Andreas Noever <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Mika Westerberg 2017-06-06 15:25:05 +03:00 • committed by Greg Kroah-Hartman
commit 72ee33907b
4 changed files with 72 additions and 0 deletions
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32
drivers/thunderbolt/eeprom.c
View file

@ -204,6 +204,11 @@ struct tb_drom_entry_header {
enum tb_drom_entry_type type:1;
} __packed;
struct tb_drom_entry_generic {
struct tb_drom_entry_header header;
u8 data[0];
} __packed;
struct tb_drom_entry_port {
/* BYTES 0-1 */
struct tb_drom_entry_header header;
@ -295,6 +300,32 @@ int tb_drom_read_uid_only(struct tb_switch *sw, u64 *uid)
return 0;
}
static int tb_drom_parse_entry_generic(struct tb_switch *sw,
struct tb_drom_entry_header *header)
{
const struct tb_drom_entry_generic *entry =
(const struct tb_drom_entry_generic *)header;
switch (header->index) {
case 1:
/* Length includes 2 bytes header so remove it before copy */
sw->vendor_name = kstrndup(entry->data,
header->len - sizeof(*header), GFP_KERNEL);
if (!sw->vendor_name)
return -ENOMEM;
break;
case 2:
sw->device_name = kstrndup(entry->data,
header->len - sizeof(*header), GFP_KERNEL);
if (!sw->device_name)
return -ENOMEM;
break;
}
return 0;
}
static int tb_drom_parse_entry_port(struct tb_switch *sw,
struct tb_drom_entry_header *header)
{
@ -350,6 +381,7 @@ static int tb_drom_parse_entries(struct tb_switch *sw)
switch (entry->type) {
case TB_DROM_ENTRY_GENERIC:
res = tb_drom_parse_entry_generic(sw, entry);
break;
case TB_DROM_ENTRY_PORT:
res = tb_drom_parse_entry_port(sw, entry);

22
drivers/thunderbolt/switch.c
View file

@ -319,6 +319,15 @@ static ssize_t device_show(struct device *dev, struct device_attribute *attr,
}
static DEVICE_ATTR_RO(device);
static ssize_t
device_name_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct tb_switch *sw = tb_to_switch(dev);
return sprintf(buf, "%s\n", sw->device_name ? sw->device_name : "");
}
static DEVICE_ATTR_RO(device_name);
static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
@ -328,6 +337,15 @@ static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
}
static DEVICE_ATTR_RO(vendor);
static ssize_t
vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct tb_switch *sw = tb_to_switch(dev);
return sprintf(buf, "%s\n", sw->vendor_name ? sw->vendor_name : "");
}
static DEVICE_ATTR_RO(vendor_name);
static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
@ -339,7 +357,9 @@ static DEVICE_ATTR_RO(unique_id);
static struct attribute *switch_attrs[] = {
&dev_attr_device.attr,
&dev_attr_device_name.attr,
&dev_attr_vendor.attr,
&dev_attr_vendor_name.attr,
&dev_attr_unique_id.attr,
NULL,
};
@ -358,6 +378,8 @@ static void tb_switch_release(struct device *dev)
struct tb_switch *sw = tb_to_switch(dev);
kfree(sw->uuid);
kfree(sw->device_name);
kfree(sw->vendor_name);
kfree(sw->ports);
kfree(sw->drom);
kfree(sw);

4
drivers/thunderbolt/tb.h
View file

@ -23,6 +23,8 @@
* @uuid: UUID of the switch (or %NULL if not supported)
* @vendor: Vendor ID of the switch
* @device: Device ID of the switch
* @vendor_name: Name of the vendor (or %NULL if not known)
* @device_name: Name of the device (or %NULL if not known)
* @cap_plug_events: Offset to the plug events capability (%0 if not found)
* @is_unplugged: The switch is going away
* @drom: DROM of the switch (%NULL if not found)
@ -36,6 +38,8 @@ struct tb_switch {
uuid_be *uuid;
u16 vendor;
u16 device;
const char *vendor_name;
const char *device_name;
int cap_plug_events;
bool is_unplugged;
u8 *drom;