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
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
/* Copyright 2015 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.
*/
/*
* USB charger / BC1.2 task. This code assumes that CONFIG_CHARGE_MANAGER
* is defined and implemented. PI3USB9281 is the only charger detector
* currently supported.
*/
#include "charge_manager.h"
#include "common.h"
#include "ec_commands.h"
#include "gpio.h"
#include "pi3usb9281.h"
#include "task.h"
#include "timer.h"
#include "usb_charge.h"
#include "usb_pd.h"
/* Wait after a charger is detected to debounce pin contact order */
#define USB_CHG_DEBOUNCE_DELAY_MS 1000
/*
* Wait after reset, before re-enabling attach interrupt, so that the
* spurious attach interrupt from certain ports is ignored.
*/
#define USB_CHG_RESET_DELAY_MS 100
int usb_charger_port_is_sourcing_vbus(int port)
{
if (port == 0)
return gpio_get_level(GPIO_USB_C0_5V_EN);
#if CONFIG_USB_PD_PORT_COUNT >= 2
else if (port == 1)
return gpio_get_level(GPIO_USB_C1_5V_EN);
#endif
/* Not a valid port */
return 0;
}
void usb_charger_task(void)
{
int port = (task_get_current() == TASK_ID_USB_CHG_P0 ? 0 : 1);
int device_type, charger_status;
struct charge_port_info charge;
int type;
charge.voltage = USB_CHARGER_VOLTAGE_MV;
/* Initialize chip and enable interrupts */
pi3usb9281_init(port);
while (1) {
/* Read interrupt register to clear on chip */
pi3usb9281_get_interrupts(port);
if (usb_charger_port_is_sourcing_vbus(port)) {
/* If we're sourcing VBUS then we're not charging */
device_type = charger_status = 0;
} else {
/* Set device type */
device_type = pi3usb9281_get_device_type(port);
charger_status = pi3usb9281_get_charger_status(port);
}
/* Debounce pin plug order if we detect a charger */
if (device_type || PI3USB9281_CHG_STATUS_ANY(charger_status)) {
msleep(USB_CHG_DEBOUNCE_DELAY_MS);
/* next operation might trigger a detach interrupt */
pi3usb9281_disable_interrupts(port);
/* Ensure D+/D- are open before resetting */
pi3usb9281_set_switch_manual(port, 1);
pi3usb9281_set_pins(port, 0);
/* Let D+/D- relax to their idle state */
msleep(40);
/*
* Trigger chip reset to refresh detection registers.
* WARNING: This reset is acceptable for samus_pd,
* but may not be acceptable for devices that have
* an OTG / device mode, as we may be interrupting
* the connection.
*/
pi3usb9281_reset(port);
/*
* Restore data switch settings - switches return to
* closed on reset until restored.
*/
board_set_usb_switches(port, USB_SWITCH_RESTORE);
/* Clear possible disconnect interrupt */
pi3usb9281_get_interrupts(port);
/* Mask attach interrupt */
pi3usb9281_set_interrupt_mask(port,
0xff &
~PI3USB9281_INT_ATTACH);
/* Re-enable interrupts */
pi3usb9281_enable_interrupts(port);
msleep(USB_CHG_RESET_DELAY_MS);
/* Clear possible attach interrupt */
pi3usb9281_get_interrupts(port);
/* Re-enable attach interrupt */
pi3usb9281_set_interrupt_mask(port, 0xff);
/* Re-read ID registers */
device_type = pi3usb9281_get_device_type(port);
charger_status = pi3usb9281_get_charger_status(port);
}
/* Attachment: decode + update available charge */
if (device_type || PI3USB9281_CHG_STATUS_ANY(charger_status)) {
if (PI3USB9281_CHG_STATUS_ANY(charger_status))
type = CHARGE_SUPPLIER_PROPRIETARY;
else if (device_type & PI3USB9281_TYPE_CDP)
type = CHARGE_SUPPLIER_BC12_CDP;
else if (device_type & PI3USB9281_TYPE_DCP)
type = CHARGE_SUPPLIER_BC12_DCP;
else if (device_type & PI3USB9281_TYPE_SDP)
type = CHARGE_SUPPLIER_BC12_SDP;
else
type = CHARGE_SUPPLIER_OTHER;
charge.current = pi3usb9281_get_ilim(device_type,
charger_status);
charge_manager_update_charge(type, port, &charge);
} else { /* Detachment: update available charge to 0 */
charge.current = 0;
charge_manager_update_charge(
CHARGE_SUPPLIER_PROPRIETARY,
port,
&charge);
charge_manager_update_charge(
CHARGE_SUPPLIER_BC12_CDP,
port,
&charge);
charge_manager_update_charge(
CHARGE_SUPPLIER_BC12_DCP,
port,
&charge);
charge_manager_update_charge(
CHARGE_SUPPLIER_BC12_SDP,
port,
&charge);
charge_manager_update_charge(
CHARGE_SUPPLIER_OTHER,
port,
&charge);
}
/* notify host of power info change */
pd_send_host_event(PD_EVENT_POWER_CHANGE);
/* Wait for interrupt */
task_wait_event(-1);
}
}
|
