1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
/* Copyright 2016 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Virtual USB mux driver for host-controlled USB muxes.
*/
#include "common.h"
#include "console.h"
#include "host_command.h"
#include "usb_mux.h"
#include "util.h"
/*
* USB PD protocol configures the USB & DP mux state and USB PD policy
* configures the HPD mux state. Both states are independent of each other
* may differ when the PD role changes when in dock mode.
*/
#define USB_PD_MUX_HPD_STATE (USB_PD_MUX_HPD_LVL | USB_PD_MUX_HPD_IRQ)
#define USB_PD_MUX_USB_DP_STATE (USB_PD_MUX_USB_ENABLED | \
USB_PD_MUX_DP_ENABLED | USB_PD_MUX_POLARITY_INVERTED)
static mux_state_t virtual_mux_state[CONFIG_USB_PD_PORT_COUNT];
static inline void virtual_mux_update_state(int port, mux_state_t mux_state)
{
if (virtual_mux_state[port] != mux_state) {
virtual_mux_state[port] = mux_state;
host_set_single_event(EC_HOST_EVENT_USB_MUX);
}
}
static int virtual_init(int port)
{
return EC_SUCCESS;
}
/*
* Set the state of our 'virtual' mux. The EC does not actually control this
* mux, so update the desired state, then notify the host of the update.
*/
static int virtual_set_mux(int port, mux_state_t mux_state)
{
/* Current USB & DP mux status + existing HPD related mux status */
mux_state_t new_mux_state = (mux_state & ~USB_PD_MUX_HPD_STATE) |
(virtual_mux_state[port] & USB_PD_MUX_HPD_STATE);
virtual_mux_update_state(port, new_mux_state);
return EC_SUCCESS;
}
/*
* Get the state of our 'virtual' mux. Since we the EC does not actually
* control this mux, and the EC has no way of knowing its actual status,
* we return the desired state here.
*/
static int virtual_get_mux(int port, mux_state_t *mux_state)
{
*mux_state = virtual_mux_state[port];
return EC_SUCCESS;
}
void virtual_hpd_update(int port, int hpd_lvl, int hpd_irq)
{
/* Current HPD related mux status + existing USB & DP mux status */
mux_state_t new_mux_state = (hpd_lvl ? USB_PD_MUX_HPD_LVL : 0) |
(hpd_irq ? USB_PD_MUX_HPD_IRQ : 0) |
(virtual_mux_state[port] & USB_PD_MUX_USB_DP_STATE);
virtual_mux_update_state(port, new_mux_state);
}
const struct usb_mux_driver virtual_usb_mux_driver = {
.init = virtual_init,
.set = virtual_set_mux,
.get = virtual_get_mux,
};
|
