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lm_i2c.c revision 1.5 
      1 /*	$NetBSD: lm_i2c.c,v 1.5 2018/06/16 21:22:13 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2000 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Bill Squier.
      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: lm_i2c.c,v 1.5 2018/06/16 21:22:13 thorpej Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/systm.h>
     37 #include <sys/kernel.h>
     38 #include <sys/device.h>
     39 #include <sys/conf.h>
     40 
     41 #include <dev/i2c/i2cvar.h>
     42 
     43 #include <dev/sysmon/sysmonvar.h>
     44 
     45 #include <dev/ic/nslm7xvar.h>
     46 
     47 int 	lm_i2c_match(device_t, cfdata_t, void *);
     48 void 	lm_i2c_attach(device_t, device_t, void *);
     49 int 	lm_i2c_detach(device_t, int);
     50 
     51 uint8_t lm_i2c_readreg(struct lm_softc *, int);
     52 void 	lm_i2c_writereg(struct lm_softc *, int, uint8_t);
     53 
     54 struct lm_i2c_softc {
     55 	struct lm_softc sc_lmsc;
     56 	i2c_tag_t sc_tag;
     57 	i2c_addr_t sc_addr;
     58 };
     59 
     60 CFATTACH_DECL_NEW(lm_iic, sizeof(struct lm_i2c_softc),
     61     lm_i2c_match, lm_i2c_attach, lm_i2c_detach, NULL);
     62 
     63 int
     64 lm_i2c_match(device_t parent, cfdata_t match, void *aux)
     65 {
     66 	struct i2c_attach_args *ia = aux;
     67 	int rv = 0;
     68 	struct lm_i2c_softc sc;
     69 
     70 	/* Must supply an address */
     71 	if (ia->ia_addr < 1)
     72 		return 0;
     73 
     74 	/* XXXJRT filter addresses //at all// please? */
     75 
     76 	/* Bus independent probe */
     77 	sc.sc_lmsc.lm_writereg = lm_i2c_writereg;
     78 	sc.sc_lmsc.lm_readreg = lm_i2c_readreg;
     79 	sc.sc_tag = ia->ia_tag;
     80 	sc.sc_addr = ia->ia_addr;
     81 	rv = lm_match(&sc.sc_lmsc);
     82 
     83 	return rv ? I2C_MATCH_ADDRESS_AND_PROBE : 0;
     84 }
     85 
     86 
     87 void
     88 lm_i2c_attach(device_t parent, device_t self, void *aux)
     89 {
     90 	struct lm_i2c_softc *sc = device_private(self);
     91 	struct i2c_attach_args *ia = aux;
     92 
     93 	sc->sc_tag = ia->ia_tag;
     94 	sc->sc_addr = ia->ia_addr;
     95 
     96 	/* Bus-independent attachment */
     97 	sc->sc_lmsc.sc_dev = self;
     98 	sc->sc_lmsc.lm_writereg = lm_i2c_writereg;
     99 	sc->sc_lmsc.lm_readreg = lm_i2c_readreg;
    100 
    101 	lm_attach(&sc->sc_lmsc);
    102 }
    103 
    104 int
    105 lm_i2c_detach(device_t self, int flags)
    106 {
    107 	struct lm_i2c_softc *sc = device_private(self);
    108 
    109 	lm_detach(&sc->sc_lmsc);
    110 	return 0;
    111 }
    112 
    113 uint8_t
    114 lm_i2c_readreg(struct lm_softc *lmsc, int reg)
    115 {
    116 	struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc;
    117 	uint8_t cmd, data;
    118 
    119 	iic_acquire_bus(sc->sc_tag, 0);
    120 
    121 	cmd = reg;
    122 	iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
    123 		 sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0);
    124 
    125 	iic_release_bus(sc->sc_tag, 0);
    126 
    127 	return data;
    128 }
    129 
    130 
    131 void
    132 lm_i2c_writereg(struct lm_softc *lmsc, int reg, uint8_t val)
    133 {
    134 	struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc;
    135 	uint8_t cmd, data;
    136 
    137 	iic_acquire_bus(sc->sc_tag, 0);
    138 
    139 	cmd = reg;
    140 	data = val;
    141 	iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
    142 		 sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0);
    143 
    144 	iic_release_bus(sc->sc_tag, 0);
    145 }
    146