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