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
|
/* Copyright 2015 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Pericom PI3USB3X532 USB port switch driver.
*/
#include "common.h"
#include "i2c.h"
#include "pi3usb3x532.h"
#include "usb_mux.h"
#include "util.h"
static int pi3usb3x532_read(const struct usb_mux *me, uint8_t reg, uint8_t *val)
{
int read, res;
/*
* First byte read will be i2c address (ignored).
* Second byte read will be vendor ID.
* Third byte read will be selection control.
*/
res = i2c_read16(me->i2c_port, me->i2c_addr_flags, 0, &read);
if (res)
return res;
if (reg == PI3USB3X532_REG_VENDOR)
*val = read & 0xff;
else /* reg == PI3USB3X532_REG_CONTROL */
*val = (read >> 8) & 0xff;
return EC_SUCCESS;
}
static int pi3usb3x532_write(const struct usb_mux *me, uint8_t reg, uint8_t val)
{
if (reg != PI3USB3X532_REG_CONTROL)
return EC_ERROR_UNKNOWN;
return i2c_write8(me->i2c_port, me->i2c_addr_flags, 0, val);
}
int pi3usb3x532_check_vendor(const struct usb_mux *me, int *val)
{
int res;
uint8_t read;
res = pi3usb3x532_read(me, PI3USB3X532_REG_VENDOR, &read);
if (res)
return res;
*val = read;
return EC_SUCCESS;
}
static int pi3usb3x532_reset(const struct usb_mux *me)
{
return pi3usb3x532_write(me, PI3USB3X532_REG_CONTROL,
(PI3USB3X532_MODE_POWERDOWN &
PI3USB3X532_CTRL_MASK) |
PI3USB3X532_CTRL_RSVD);
}
static int pi3usb3x532_init(const struct usb_mux *me)
{
uint8_t val;
int res;
res = pi3usb3x532_reset(me);
if (res)
return res;
res = pi3usb3x532_read(me, PI3USB3X532_REG_VENDOR, &val);
if (res)
return res;
if (val != PI3USB3X532_VENDOR_ID)
return EC_ERROR_UNKNOWN;
return EC_SUCCESS;
}
/* Writes control register to set switch mode */
static int pi3usb3x532_set_mux(const struct usb_mux *me, mux_state_t mux_state,
bool *ack_required)
{
uint8_t reg = 0;
/* This driver does not use host command ACKs */
*ack_required = false;
/* This driver treats safe mode as none */
if (mux_state == USB_PD_MUX_SAFE_MODE)
mux_state = USB_PD_MUX_NONE;
if (mux_state & USB_PD_MUX_USB_ENABLED)
reg |= PI3USB3X532_MODE_USB;
if (mux_state & USB_PD_MUX_DP_ENABLED)
reg |= PI3USB3X532_MODE_DP;
if (mux_state & USB_PD_MUX_POLARITY_INVERTED)
reg |= PI3USB3X532_BIT_SWAP;
return pi3usb3x532_write(me, PI3USB3X532_REG_CONTROL,
reg | PI3USB3X532_CTRL_RSVD);
}
/* Reads control register and updates mux_state accordingly */
static int pi3usb3x532_get_mux(const struct usb_mux *me, mux_state_t *mux_state)
{
uint8_t reg = 0;
uint8_t res;
*mux_state = 0;
res = pi3usb3x532_read(me, PI3USB3X532_REG_CONTROL, ®);
if (res)
return res;
if (reg & PI3USB3X532_MODE_USB)
*mux_state |= USB_PD_MUX_USB_ENABLED;
if (reg & PI3USB3X532_MODE_DP)
*mux_state |= USB_PD_MUX_DP_ENABLED;
if (reg & PI3USB3X532_BIT_SWAP)
*mux_state |= USB_PD_MUX_POLARITY_INVERTED;
return EC_SUCCESS;
}
const struct usb_mux_driver pi3usb3x532_usb_mux_driver = {
.init = pi3usb3x532_init,
.set = pi3usb3x532_set_mux,
.get = pi3usb3x532_get_mux,
};
|
