xref: /netbsd-src/sys/dev/i2c/axp22x.c (revision 18f3098ca55677bef03345e9be442d445d06437b)
1 /* $NetBSD: axp22x.c,v 1.9 2021/01/27 02:29:48 thorpej Exp $ */
2 
3 /*-
4  * Copyright (c) 2014 Jared D. McNeill <jmcneill@invisible.ca>
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26  * POSSIBILITY OF SUCH DAMAGE.
27  */
28 
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: axp22x.c,v 1.9 2021/01/27 02:29:48 thorpej Exp $");
31 
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/device.h>
35 #include <sys/conf.h>
36 #include <sys/bus.h>
37 #include <sys/kmem.h>
38 
39 #include <dev/i2c/i2cvar.h>
40 
41 #include <dev/sysmon/sysmonvar.h>
42 
43 static const struct device_compatible_entry compat_data[] = {
44 	{ .compat = "x-powers,axp221" },
45 	DEVICE_COMPAT_EOL
46 };
47 
48 #define AXP_TEMP_MON_REG	0x56	/* 2 bytes */
49 
50 struct axp22x_softc {
51 	device_t	sc_dev;
52 	i2c_tag_t	sc_i2c;
53 	i2c_addr_t	sc_addr;
54 
55 	struct sysmon_envsys *sc_sme;
56 	envsys_data_t	sc_sensor_temp;
57 };
58 
59 static int	axp22x_match(device_t, cfdata_t, void *);
60 static void	axp22x_attach(device_t, device_t, void *);
61 
62 static void	axp22x_sensors_refresh(struct sysmon_envsys *, envsys_data_t *);
63 static int	axp22x_read(struct axp22x_softc *, uint8_t, uint8_t *, size_t);
64 
65 CFATTACH_DECL_NEW(axp22x, sizeof(struct axp22x_softc),
66     axp22x_match, axp22x_attach, NULL, NULL);
67 
68 static int
axp22x_match(device_t parent,cfdata_t match,void * aux)69 axp22x_match(device_t parent, cfdata_t match, void *aux)
70 {
71 	struct i2c_attach_args *ia = aux;
72 	int match_result;
73 
74 	if (iic_use_direct_match(ia, match, compat_data, &match_result))
75 		return match_result;
76 
77 	/* This device is direct-config only. */
78 
79 	return 0;
80 }
81 
82 static void
axp22x_attach(device_t parent,device_t self,void * aux)83 axp22x_attach(device_t parent, device_t self, void *aux)
84 {
85 	struct axp22x_softc *sc = device_private(self);
86 	struct i2c_attach_args *ia = aux;
87 
88 	sc->sc_dev = self;
89 	sc->sc_i2c = ia->ia_tag;
90 	sc->sc_addr = ia->ia_addr;
91 
92 	aprint_naive("\n");
93 	aprint_normal("\n");
94 
95 	sc->sc_sme = sysmon_envsys_create();
96 	sc->sc_sme->sme_name = device_xname(self);
97 	sc->sc_sme->sme_cookie = sc;
98 	sc->sc_sme->sme_refresh = axp22x_sensors_refresh;
99 
100 	sc->sc_sensor_temp.units = ENVSYS_STEMP;
101 	sc->sc_sensor_temp.state = ENVSYS_SINVALID;
102 	sc->sc_sensor_temp.flags = ENVSYS_FHAS_ENTROPY;
103 	snprintf(sc->sc_sensor_temp.desc, sizeof(sc->sc_sensor_temp.desc),
104 	    "internal temperature");
105 	sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor_temp);
106 
107 	sysmon_envsys_register(sc->sc_sme);
108 }
109 
110 static void
axp22x_sensors_refresh(struct sysmon_envsys * sme,envsys_data_t * edata)111 axp22x_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
112 {
113 	struct axp22x_softc *sc = sme->sme_cookie;
114 	uint8_t buf[2];
115 	int error;
116 
117 	iic_acquire_bus(sc->sc_i2c, 0);
118 	error = axp22x_read(sc, AXP_TEMP_MON_REG, buf, sizeof(buf));
119 	iic_release_bus(sc->sc_i2c, 0);
120 
121 	if (error) {
122 		edata->state = ENVSYS_SINVALID;
123 	} else {
124 		/* between -243.7C and 165.8C, step +0.1C */
125 		edata->value_cur = (((buf[0] << 4) | (buf[1] & 0xf)) - 2437)
126 				   * 100000 + 273150000;
127 		edata->state = ENVSYS_SVALID;
128 	}
129 }
130 
131 static int
axp22x_read(struct axp22x_softc * sc,uint8_t reg,uint8_t * val,size_t len)132 axp22x_read(struct axp22x_softc *sc, uint8_t reg, uint8_t *val, size_t len)
133 {
134 	size_t i;
135 	int error;
136 
137 	for (i = 0; i < len; i++) {
138 		error = iic_smbus_read_byte(sc->sc_i2c, sc->sc_addr,
139 		    reg + i, &val[i], 0);
140 		if (error)
141 			return error;
142 	}
143 
144 	return 0;
145 }
146