1/* $NetBSD: lm_i2c.c,v 1.7 2021/06/13 09:48:44 mlelstv 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 1.7 2021/06/13 09:48:44 mlelstv 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#include <sys/kmem.h> 41 42#include <dev/i2c/i2cvar.h> 43 44#include <dev/sysmon/sysmonvar.h> 45 46#include <dev/ic/nslm7xvar.h> 47 48int lm_i2c_match(device_t, cfdata_t, void *); 49void lm_i2c_attach(device_t, device_t, void *); 50int lm_i2c_detach(device_t, int); 51 52uint8_t lm_i2c_readreg(struct lm_softc *, int); 53void lm_i2c_writereg(struct lm_softc *, int, uint8_t); 54 55struct lm_i2c_softc { 56 struct lm_softc sc_lmsc; 57 i2c_tag_t sc_tag; 58 i2c_addr_t sc_addr; 59}; 60 61CFATTACH_DECL_NEW(lm_iic, sizeof(struct lm_i2c_softc), 62 lm_i2c_match, lm_i2c_attach, lm_i2c_detach, NULL); 63 64int 65lm_i2c_match(device_t parent, cfdata_t match, void *aux) 66{ 67 struct i2c_attach_args *ia = aux; 68 int rv = 0; 69 struct lm_i2c_softc *sc; 70 71 /* Must supply an address */ 72 if (ia->ia_addr < 1) 73 return 0; 74 75 /* XXXJRT filter addresses //at all// please? */ 76 77 /* Bus independent probe */ 78 sc = kmem_zalloc(sizeof(*sc), KM_SLEEP); 79 sc->sc_lmsc.lm_writereg = lm_i2c_writereg; 80 sc->sc_lmsc.lm_readreg = lm_i2c_readreg; 81 sc->sc_tag = ia->ia_tag; 82 sc->sc_addr = ia->ia_addr; 83 rv = lm_match(&sc->sc_lmsc); 84 kmem_free(sc, sizeof(*sc)); 85 86 return rv ? I2C_MATCH_ADDRESS_AND_PROBE : 0; 87} 88 89 90void 91lm_i2c_attach(device_t parent, device_t self, void *aux) 92{ 93 struct lm_i2c_softc *sc = device_private(self); 94 struct i2c_attach_args *ia = aux; 95 96 sc->sc_tag = ia->ia_tag; 97 sc->sc_addr = ia->ia_addr; 98 99 /* Bus-independent attachment */ 100 sc->sc_lmsc.sc_dev = self; 101 sc->sc_lmsc.lm_writereg = lm_i2c_writereg; 102 sc->sc_lmsc.lm_readreg = lm_i2c_readreg; 103 104 lm_attach(&sc->sc_lmsc); 105} 106 107int 108lm_i2c_detach(device_t self, int flags) 109{ 110 struct lm_i2c_softc *sc = device_private(self); 111 112 lm_detach(&sc->sc_lmsc); 113 return 0; 114} 115 116uint8_t 117lm_i2c_readreg(struct lm_softc *lmsc, int reg) 118{ 119 struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc; 120 uint8_t cmd, data; 121 122 if (iic_acquire_bus(sc->sc_tag, 0)) 123 return 0; 124 125 cmd = reg; 126 iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, 127 sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0); 128 129 iic_release_bus(sc->sc_tag, 0); 130 131 return data; 132} 133 134 135void 136lm_i2c_writereg(struct lm_softc *lmsc, int reg, uint8_t val) 137{ 138 struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc; 139 uint8_t cmd, data; 140 141 if (iic_acquire_bus(sc->sc_tag, 0)) 142 return; 143 144 cmd = reg; 145 data = val; 146 iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, 147 sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0); 148 149 iic_release_bus(sc->sc_tag, 0); 150} 151