1 /* $OpenBSD: m41t8x.c,v 1.3 2022/10/12 13:39:50 kettenis Exp $ */
2
3 /*
4 * Copyright (c) 2010 Miodrag Vallat.
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 /*
20 * M41T8x clock connected to an I2C bus
21 */
22
23 #include <sys/param.h>
24 #include <sys/kernel.h>
25 #include <sys/systm.h>
26 #include <sys/device.h>
27
28 #include <dev/clock_subr.h>
29 #include <dev/i2c/i2cvar.h>
30 #include <dev/ic/m41t8xreg.h>
31
32 struct m41t8xrtc_softc {
33 struct device sc_dev;
34 struct todr_chip_handle sc_todr;
35 i2c_tag_t sc_tag;
36 i2c_addr_t sc_addr;
37 };
38
39 int m41t8xrtc_match(struct device *, void *, void *);
40 void m41t8xrtc_attach(struct device *, struct device *, void *);
41
42 const struct cfattach mfokrtc_ca = {
43 sizeof(struct m41t8xrtc_softc),
44 m41t8xrtc_match, m41t8xrtc_attach
45 };
46
47 struct cfdriver mfokrtc_cd = {
48 NULL, "mfokrtc", DV_DULL
49 };
50
51 int m41t8xrtc_gettime(struct todr_chip_handle *, struct timeval *);
52 int m41t8xrtc_settime(struct todr_chip_handle *, struct timeval *);
53
54 int
m41t8xrtc_match(struct device * parent,void * vcf,void * aux)55 m41t8xrtc_match(struct device *parent, void *vcf, void *aux)
56 {
57 struct i2c_attach_args *ia = (struct i2c_attach_args *)aux;
58
59 if (strcmp(ia->ia_name, "st,m41t83") == 0 ||
60 strcmp(ia->ia_name, "microcrystal,rv4162") == 0)
61 return (1);
62 return (0);
63
64 }
65
66 void
m41t8xrtc_attach(struct device * parent,struct device * self,void * aux)67 m41t8xrtc_attach(struct device *parent, struct device *self, void *aux)
68 {
69 struct m41t8xrtc_softc *sc = (struct m41t8xrtc_softc *)self;
70 struct i2c_attach_args *ia = (struct i2c_attach_args *)aux;
71
72 sc->sc_tag = ia->ia_tag;
73 sc->sc_addr = ia->ia_addr;
74
75 sc->sc_todr.cookie = sc;
76 sc->sc_todr.todr_gettime = m41t8xrtc_gettime;
77 sc->sc_todr.todr_settime = m41t8xrtc_settime;
78 sc->sc_todr.todr_quality = 1000;
79 todr_attach(&sc->sc_todr);
80
81 printf("\n");
82 }
83
84 int
m41t8xrtc_gettime(struct todr_chip_handle * handle,struct timeval * tv)85 m41t8xrtc_gettime(struct todr_chip_handle *handle, struct timeval *tv)
86 {
87 struct clock_ymdhms dt;
88 struct m41t8xrtc_softc *sc = handle->cookie;
89 uint8_t regno, data[M41T8X_TOD_LENGTH];
90 int s;
91
92 iic_acquire_bus(sc->sc_tag, 0);
93 s = splclock();
94 for (regno = M41T8X_TOD_START;
95 regno < M41T8X_TOD_START + M41T8X_TOD_LENGTH; regno++)
96 iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
97 ®no, sizeof regno, data + regno - M41T8X_TOD_START,
98 sizeof data[0], 0);
99 splx(s);
100 iic_release_bus(sc->sc_tag, 0);
101
102 dt.dt_sec = FROMBCD(data[M41T8X_SEC] & ~M41T8X_STOP);
103 dt.dt_min = FROMBCD(data[M41T8X_MIN]);
104 dt.dt_hour = FROMBCD(data[M41T8X_HR] & ~(M41T8X_CEB | M41T8X_CB));
105 dt.dt_day = FROMBCD(data[M41T8X_DAY]);
106 dt.dt_mon = FROMBCD(data[M41T8X_MON]);
107 dt.dt_year = FROMBCD(data[M41T8X_YEAR]) + 2000;
108 if (data[M41T8X_HR] & M41T8X_CB)
109 dt.dt_year += 100;
110
111 tv->tv_sec = clock_ymdhms_to_secs(&dt);
112 tv->tv_usec = 0;
113 return 0;
114 }
115
116 int
m41t8xrtc_settime(struct todr_chip_handle * handle,struct timeval * tv)117 m41t8xrtc_settime(struct todr_chip_handle *handle, struct timeval *tv)
118 {
119 struct clock_ymdhms dt;
120 struct m41t8xrtc_softc *sc = handle->cookie;
121 uint8_t regno, data[M41T8X_TOD_LENGTH];
122 int s;
123
124 clock_secs_to_ymdhms(tv->tv_sec, &dt);
125
126 iic_acquire_bus(sc->sc_tag, 0);
127 s = splclock();
128 /* read current state */
129 for (regno = M41T8X_TOD_START;
130 regno < M41T8X_TOD_START + M41T8X_TOD_LENGTH; regno++)
131 iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
132 ®no, sizeof regno, data + regno - M41T8X_TOD_START,
133 sizeof data[0], 0);
134 /* compute new state */
135 data[M41T8X_HSEC] = 0;
136 data[M41T8X_SEC] = TOBCD(dt.dt_sec);
137 data[M41T8X_MIN] = TOBCD(dt.dt_min);
138 data[M41T8X_HR] &= M41T8X_CEB;
139 if (dt.dt_year >= 2100)
140 data[M41T8X_HR] |= M41T8X_CB;
141 data[M41T8X_HR] |= TOBCD(dt.dt_hour);
142 data[M41T8X_DOW] &= ~M41T8X_DOW_MASK;
143 data[M41T8X_DOW] |= TOBCD(dt.dt_wday + 1);
144 data[M41T8X_DAY] = TOBCD(dt.dt_day);
145 data[M41T8X_MON] = TOBCD(dt.dt_mon);
146 data[M41T8X_YEAR] = TOBCD(dt.dt_year % 100);
147 /* write new state */
148 for (regno = M41T8X_TOD_START;
149 regno < M41T8X_TOD_START + M41T8X_TOD_LENGTH; regno++)
150 iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_addr,
151 ®no, sizeof regno, data + regno, sizeof data[0], 0);
152 splx(s);
153 iic_release_bus(sc->sc_tag, 0);
154
155 return 0;
156 }
157