lm_i2c.c revision 1.2
1/* $NetBSD: lm_i2c.c,v 1.2 2008/10/13 11:16:00 pgoyette 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 1.2 2008/10/13 11:16:00 pgoyette 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 47int lm_i2c_match(device_t, cfdata_t, void *); 48void lm_i2c_attach(device_t, device_t, void *); 49int lm_i2c_detach(device_t, int); 50 51uint8_t lm_i2c_readreg(struct lm_softc *, int); 52void lm_i2c_writereg(struct lm_softc *, int, int); 53 54struct lm_i2c_softc { 55 struct lm_softc sc_lmsc; 56 i2c_tag_t sc_tag; 57 i2c_addr_t sc_addr; 58}; 59 60CFATTACH_DECL_NEW(lm_iic, sizeof(struct lm_i2c_softc), 61 lm_i2c_match, lm_i2c_attach, lm_i2c_detach, NULL); 62 63int 64lm_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 /* Bus independent probe */ 75 sc.sc_lmsc.lm_writereg = lm_i2c_writereg; 76 sc.sc_lmsc.lm_readreg = lm_i2c_readreg; 77 sc.sc_tag = ia->ia_tag; 78 sc.sc_addr = ia->ia_addr; 79 rv = lm_probe(&sc.sc_lmsc); 80 81 return rv; 82} 83 84 85void 86lm_i2c_attach(device_t parent, device_t self, void *aux) 87{ 88 struct lm_i2c_softc *sc = device_private(self); 89 struct i2c_attach_args *ia = aux; 90 91 sc->sc_tag = ia->ia_tag; 92 sc->sc_addr = ia->ia_addr; 93 94 /* Bus-independent attachment */ 95 sc->sc_lmsc.sc_dev = self; 96 sc->sc_lmsc.lm_writereg = lm_i2c_writereg; 97 sc->sc_lmsc.lm_readreg = lm_i2c_readreg; 98 99 lm_attach(&sc->sc_lmsc); 100} 101 102int 103lm_i2c_detach(device_t self, int flags) 104{ 105 struct lm_i2c_softc *sc = device_private(self); 106 107 lm_detach(&sc->sc_lmsc); 108 return 0; 109} 110 111uint8_t 112lm_i2c_readreg(struct lm_softc *lmsc, int reg) 113{ 114 struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc; 115 uint8_t cmd, data; 116 117 iic_acquire_bus(sc->sc_tag, 0); 118 119 cmd = reg; 120 iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, 121 sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0); 122 123 iic_release_bus(sc->sc_tag, 0); 124 125 return data; 126} 127 128 129void 130lm_i2c_writereg(struct lm_softc *lmsc, int reg, int val) 131{ 132 struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc; 133 uint8_t cmd, data; 134 135 iic_acquire_bus(sc->sc_tag, 0); 136 137 cmd = reg; 138 data = val; 139 iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, 140 sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0); 141 142 iic_release_bus(sc->sc_tag, 0); 143} 144