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
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
/* $OpenBSD: sypwr.c,v 1.4 2020/11/12 10:47:07 patrick Exp $ */
/*
* Copyright (c) 2017 Mark Kettenis <kettenis@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_regulator.h>
#include <dev/ofw/fdt.h>
#include <dev/i2c/i2cvar.h>
#define SY8106A_VOUT1_SEL 0x01
#define SY8106A_VOUT1_SEL_I2C (1 << 7)
#define SY8106A_VOUT1_SEL_MASK 0x7f
struct sypwr_softc {
struct device sc_dev;
i2c_tag_t sc_tag;
i2c_addr_t sc_addr;
uint32_t sc_fixed_microvolt;
struct regulator_device sc_rd;
};
int sypwr_match(struct device *, void *, void *);
void sypwr_attach(struct device *, struct device *, void *);
int sypwr_activate(struct device *, int);
struct cfattach sypwr_ca = {
sizeof(struct sypwr_softc), sypwr_match, sypwr_attach,
NULL, sypwr_activate
};
struct cfdriver sypwr_cd = {
NULL, "sypwr", DV_DULL
};
uint8_t sypwr_read(struct sypwr_softc *, int);
void sypwr_write(struct sypwr_softc *, int, uint8_t);
uint32_t sypwr_get_voltage(void *);
int sypwr_set_voltage(void *, uint32_t);
int
sypwr_match(struct device *parent, void *match, void *aux)
{
struct i2c_attach_args *ia = aux;
return (strcmp(ia->ia_name, "silergy,sy8106a") == 0);
}
void
sypwr_attach(struct device *parent, struct device *self, void *aux)
{
struct sypwr_softc *sc = (struct sypwr_softc *)self;
struct i2c_attach_args *ia = aux;
int node = *(int *)ia->ia_cookie;
uint8_t reg;
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
sc->sc_fixed_microvolt =
OF_getpropint(node, "silergy,fixed-microvolt", 0);
/*
* Only register the regulator if it is under I2C control
* (i.e. initialized by the firmware) or if the device tree
* specifies its fixed voltage. Otherwise we have no idea
* what the current output voltage is, which will confuse the
* regulator framework.
*/
reg = sypwr_read(sc, SY8106A_VOUT1_SEL);
if (reg & SY8106A_VOUT1_SEL_I2C || sc->sc_fixed_microvolt != 0) {
uint32_t voltage;
voltage = sypwr_get_voltage(sc);
printf(": %d.%02d VDC", voltage / 1000000,
(voltage % 1000000) / 10000);
sc->sc_rd.rd_node = node;
sc->sc_rd.rd_cookie = sc;
sc->sc_rd.rd_get_voltage = sypwr_get_voltage;
sc->sc_rd.rd_set_voltage = sypwr_set_voltage;
regulator_register(&sc->sc_rd);
}
printf("\n");
}
int
sypwr_activate(struct device *self, int act)
{
struct sypwr_softc *sc = (struct sypwr_softc *)self;
uint8_t reg;
switch (act) {
case DVACT_POWERDOWN:
/*
* Restore fixed voltage otherwise we might hang after
* a warm reset.
*/
if (sc->sc_fixed_microvolt != 0) {
reg = sypwr_read(sc, SY8106A_VOUT1_SEL);
reg &= ~SY8106A_VOUT1_SEL_I2C;
sypwr_write(sc, SY8106A_VOUT1_SEL, reg);
}
break;
}
return 0;
}
uint8_t
sypwr_read(struct sypwr_softc *sc, int reg)
{
uint8_t cmd = reg;
uint8_t val;
int error;
iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
&cmd, sizeof cmd, &val, sizeof val, I2C_F_POLL);
iic_release_bus(sc->sc_tag, I2C_F_POLL);
if (error) {
printf("error %d\n", error);
printf("%s: can't read register 0x%02x\n",
sc->sc_dev.dv_xname, reg);
val = 0xff;
}
return val;
}
void
sypwr_write(struct sypwr_softc *sc, int reg, uint8_t val)
{
uint8_t cmd = reg;
int error;
iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
error = iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_addr,
&cmd, sizeof cmd, &val, sizeof val, I2C_F_POLL);
iic_release_bus(sc->sc_tag, I2C_F_POLL);
if (error) {
printf("%s: can't write register 0x%02x\n",
sc->sc_dev.dv_xname, reg);
}
}
uint32_t
sypwr_get_voltage(void *cookie)
{
struct sypwr_softc *sc = cookie;
uint8_t value;
value = sypwr_read(sc, SY8106A_VOUT1_SEL);
if (value & SY8106A_VOUT1_SEL_I2C)
return 680000 + (value & SY8106A_VOUT1_SEL_MASK) * 10000;
else
return sc->sc_fixed_microvolt;
}
int
sypwr_set_voltage(void *cookie, uint32_t voltage)
{
struct sypwr_softc *sc = cookie;
uint8_t value;
if (voltage < 680000 || voltage > 1950000)
return EINVAL;
value = (voltage - 680000) / 10000;
sypwr_write(sc, SY8106A_VOUT1_SEL, value | SY8106A_VOUT1_SEL_I2C);
return 0;
}
|
