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      1 /*	$NetBSD: auxfan.c,v 1.1 2026/07/26 12:53:13 jdc Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2026 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Julian Coleman.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: auxfan.c,v 1.1 2026/07/26 12:53:13 jdc Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/kernel.h>
     37 #include <sys/device.h>
     38 #include <sys/proc.h>
     39 #include <sys/types.h>
     40 
     41 #include <sys/bus.h>
     42 #include <machine/autoconf.h>
     43 
     44 #include <dev/sysmon/sysmonvar.h>
     45 
     46 #include <dev/i2c/i2cvar.h>
     47 #include <arch/sparc64/dev/auxfanreg.h>
     48 
     49 #define VAL_TO_SPEED(val)	((81680 * 60) / val)	/* Could be +/- 70 */
     50 
     51 struct auxfan_softc {
     52 	device_t	sc_dev;
     53 
     54 	i2c_tag_t	sc_tag;
     55 	int		sc_address;
     56 
     57 	struct sysmon_envsys *sc_sme;
     58 	envsys_data_t sc_sensor;
     59 };
     60 
     61 static int auxfan_match(device_t, cfdata_t, void *);
     62 static void auxfan_attach(device_t, device_t, void *);
     63 void auxfan_refresh(struct sysmon_envsys *, envsys_data_t *);
     64 
     65 CFATTACH_DECL_NEW(auxfan, sizeof(struct auxfan_softc),
     66     auxfan_match, auxfan_attach, NULL, NULL);
     67 
     68 
     69 static const struct device_compatible_entry compat_data[] = {
     70 	{ .compat = "SUNW,i2c-auxfan1" },
     71 	DEVICE_COMPAT_EOL
     72 };
     73 
     74 static int
     75 auxfan_match(device_t parent, cfdata_t cf, void *aux)
     76 {
     77 	struct i2c_attach_args *ia = aux;
     78 	int match_result;
     79 
     80 	if (iic_use_direct_match(ia, cf, compat_data, &match_result))
     81 		return match_result;
     82 
     83 	return 0;
     84 }
     85 
     86 static void
     87 auxfan_attach(device_t parent, device_t self, void *aux)
     88 {
     89 	struct auxfan_softc *sc = device_private(self);
     90 	struct i2c_attach_args *ia = aux;
     91 
     92 	sc->sc_tag = ia->ia_tag;
     93 	sc->sc_address = ia->ia_addr;
     94 	sc->sc_dev = self;
     95 
     96 	aprint_normal(": DIMM fan\n");
     97 
     98 	sc->sc_sme = sysmon_envsys_create();
     99 	sc->sc_sme->sme_name = device_xname(self);
    100 	sc->sc_sme->sme_cookie = sc;
    101 
    102 	sc->sc_sme->sme_refresh = auxfan_refresh;
    103 	strlcpy(sc->sc_sensor.desc, "dimm-fan",
    104 	    sizeof(sc->sc_sensor.desc));
    105 	sc->sc_sensor.units = ENVSYS_SFANRPM;
    106 	sc->sc_sensor.state = ENVSYS_SINVALID;
    107 	sc->sc_sensor.flags = ENVSYS_FMONCRITICAL;
    108 	if (sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor)) {
    109 		sysmon_envsys_destroy(sc->sc_sme);
    110 		sc->sc_sme = NULL;
    111 		aprint_error_dev(sc->sc_dev,
    112 		    "unable to attach sensor to sysmon\n");
    113 		return;
    114 	}
    115 	if (sysmon_envsys_register(sc->sc_sme)) {
    116 		aprint_error_dev(sc->sc_dev,
    117 		    "unable to register with sysmon\n");
    118 		sysmon_envsys_destroy(sc->sc_sme);
    119 		sc->sc_sme = NULL;
    120 		return;
    121 	}
    122 
    123 	return;
    124 }
    125 
    126 void
    127 auxfan_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
    128 {
    129 	struct auxfan_softc *sc = sme->sme_cookie;
    130 	int err = 0;
    131 	uint8_t reg, val;
    132 	uint16_t count;
    133 
    134 	if ((err = iic_acquire_bus(sc->sc_tag, 0)) != 0) {
    135 		edata->state = ENVSYS_SINVALID;
    136 		return;
    137 	}
    138 
    139 	reg = AUXFAN_DIMM_FAN_SPD_LO;
    140 	err = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
    141 	    sc->sc_address, &reg, 1, &val, 1, 0);
    142 	if (err) {
    143 		iic_release_bus(sc->sc_tag, 0);
    144 		edata->state = ENVSYS_SINVALID;
    145 		return;
    146 	}
    147 	count = val;
    148 
    149 	reg = AUXFAN_DIMM_FAN_SPD_HI;
    150 	err = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
    151 	    sc->sc_address, &reg, 1, &val, 1, 0);
    152 	iic_release_bus(sc->sc_tag, 0);
    153 	if (err) {
    154 		edata->state = ENVSYS_SINVALID;
    155 		return;
    156 	}
    157 	count += (val << 8);
    158 
    159 	if (count == 0xffff || count == 0x0) {	/* Fan stopped */
    160 		edata->value_cur = 0;
    161 		edata->state = ENVSYS_SCRITICAL;
    162 	} else {
    163 		edata->value_cur = VAL_TO_SPEED(count);
    164 		edata->state = ENVSYS_SVALID;
    165 	}
    166 }
    167