Release 4.14 drivers/thunderbolt/cap.c
// SPDX-License-Identifier: GPL-2.0
/*
* Thunderbolt Cactus Ridge driver - capabilities lookup
*
* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
*/
#include <linux/slab.h>
#include <linux/errno.h>
#include "tb.h"
#define CAP_OFFSET_MAX 0xff
#define VSE_CAP_OFFSET_MAX 0xffff
struct tb_cap_any {
union {
struct tb_cap_basic basic;
struct tb_cap_extended_short extended_short;
struct tb_cap_extended_long extended_long;
};
} __packed;
/**
* tb_port_find_cap() - Find port capability
* @port: Port to find the capability for
* @cap: Capability to look
*
* Returns offset to start of capability or %-ENOENT if no such
* capability was found. Negative errno is returned if there was an
* error.
*/
int tb_port_find_cap(struct tb_port *port, enum tb_port_cap cap)
{
u32 offset;
/*
* DP out adapters claim to implement TMU capability but in
* reality they do not so we hard code the adapter specific
* capability offset here.
*/
if (port->config.type == TB_TYPE_DP_HDMI_OUT)
offset = 0x39;
else
offset = 0x1;
do {
struct tb_cap_any header;
int ret;
ret = tb_port_read(port, &header, TB_CFG_PORT, offset, 1);
if (ret)
return ret;
if (header.basic.cap == cap)
return offset;
offset = header.basic.next;
} while (offset);
return -ENOENT;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mika Westerberg | 62 | 62.00% | 1 | 50.00% |
| Andreas Noever | 38 | 38.00% | 1 | 50.00% |
| Total | 100 | 100.00% | 2 | 100.00% |
static int tb_switch_find_cap(struct tb_switch *sw, enum tb_switch_cap cap)
{
int offset = sw->config.first_cap_offset;
while (offset > 0 && offset < CAP_OFFSET_MAX) {
struct tb_cap_any header;
int ret;
ret = tb_sw_read(sw, &header, TB_CFG_SWITCH, offset, 1);
if (ret)
return ret;
if (header.basic.cap == cap)
return offset;
offset = header.basic.next;
}
return -ENOENT;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mika Westerberg | 46 | 50.55% | 1 | 50.00% |
| Andreas Noever | 45 | 49.45% | 1 | 50.00% |
| Total | 91 | 100.00% | 2 | 100.00% |
/**
* tb_switch_find_vse_cap() - Find switch vendor specific capability
* @sw: Switch to find the capability for
* @vsec: Vendor specific capability to look
*
* Functions enumerates vendor specific capabilities (VSEC) of a switch
* and returns offset when capability matching @vsec is found. If no
* such capability is found returns %-ENOENT. In case of error returns
* negative errno.
*/
int tb_switch_find_vse_cap(struct tb_switch *sw, enum tb_switch_vse_cap vsec)
{
struct tb_cap_any header;
int offset;
offset = tb_switch_find_cap(sw, TB_SWITCH_CAP_VSE);
if (offset < 0)
return offset;
while (offset > 0 && offset < VSE_CAP_OFFSET_MAX) {
int ret;
ret = tb_sw_read(sw, &header, TB_CFG_SWITCH, offset, 2);
if (ret)
return ret;
/*
* Extended vendor specific capabilities come in two
* flavors: short and long. The latter is used when
* offset is over 0xff.
*/
if (offset >= CAP_OFFSET_MAX) {
if (header.extended_long.vsec_id == vsec)
return offset;
offset = header.extended_long.next;
} else {
if (header.extended_short.vsec_id == vsec)
return offset;
if (!header.extended_short.length)
return -ENOENT;
offset = header.extended_short.next;
}
}
return -ENOENT;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mika Westerberg | 105 | 70.95% | 1 | 50.00% |
| Andreas Noever | 43 | 29.05% | 1 | 50.00% |
| Total | 148 | 100.00% | 2 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mika Westerberg | 223 | 58.38% | 1 | 33.33% |
| Andreas Noever | 158 | 41.36% | 1 | 33.33% |
| Greg Kroah-Hartman | 1 | 0.26% | 1 | 33.33% |
| Total | 382 | 100.00% | 3 | 100.00% |
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