1 /* $OpenBSD: i2c.c,v 1.19 2022/04/06 18:59:28 naddy Exp $ */ 2 /* $NetBSD: i2c.c,v 1.1 2003/09/30 00:35:31 thorpej Exp $ */ 3 4 /* 5 * Copyright (c) 2003 Wasabi Systems, Inc. 6 * All rights reserved. 7 * 8 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed for the NetBSD Project by 21 * Wasabi Systems, Inc. 22 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 23 * or promote products derived from this software without specific prior 24 * written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/device.h> 42 #include <sys/event.h> 43 44 #define _I2C_PRIVATE 45 #include <dev/i2c/i2cvar.h> 46 47 #define IICCF_ADDR 0 48 #define IICCF_SIZE 1 49 50 struct iic_softc { 51 struct device sc_dev; 52 i2c_tag_t sc_tag; 53 }; 54 55 int iic_match(struct device *, void *, void *); 56 void iic_attach(struct device *, struct device *, void *); 57 int iic_search(struct device *, void *, void *); 58 59 const struct cfattach iic_ca = { 60 sizeof (struct iic_softc), 61 iic_match, 62 iic_attach 63 }; 64 65 struct cfdriver iic_cd = { 66 NULL, "iic", DV_DULL, CD_SKIPHIBERNATE 67 }; 68 69 int 70 iicbus_print(void *aux, const char *pnp) 71 { 72 struct i2cbus_attach_args *iba = aux; 73 74 if (pnp != NULL) 75 printf("%s at %s", iba->iba_name, pnp); 76 77 return (UNCONF); 78 } 79 80 int 81 iic_print(void *aux, const char *pnp) 82 { 83 struct i2c_attach_args *ia = aux; 84 85 if (pnp != NULL) 86 printf("\"%s\" at %s", ia->ia_name, pnp); 87 printf(" addr 0x%x", ia->ia_addr); 88 89 return (UNCONF); 90 } 91 92 int 93 iic_search(struct device *parent, void *arg, void *aux) 94 { 95 struct iic_softc *sc = (void *) parent; 96 struct cfdata *cf = arg; 97 struct i2c_attach_args ia; 98 99 if (cf->cf_loc[IICCF_ADDR] != -1) { 100 memset(&ia, 0, sizeof(ia)); 101 ia.ia_tag = sc->sc_tag; 102 ia.ia_addr = cf->cf_loc[IICCF_ADDR]; 103 ia.ia_size = cf->cf_loc[IICCF_SIZE]; 104 ia.ia_name = "unknown"; 105 106 if (cf->cf_attach->ca_match(parent, cf, &ia) > 0) 107 config_attach(parent, cf, &ia, iic_print); 108 } 109 return (0); 110 } 111 112 int 113 iic_match(struct device *parent, void *arg, void *aux) 114 { 115 struct cfdata *cf = arg; 116 struct i2cbus_attach_args *iba = aux; 117 118 /* Just make sure we're looking for i2c. */ 119 return (strcmp(iba->iba_name, cf->cf_driver->cd_name) == 0); 120 } 121 122 void 123 iic_attach(struct device *parent, struct device *self, void *aux) 124 { 125 struct iic_softc *sc = (void *) self; 126 struct i2cbus_attach_args *iba = aux; 127 128 sc->sc_tag = iba->iba_tag; 129 130 printf("\n"); 131 132 /* 133 * Attach all i2c devices described in the kernel 134 * configuration file. 135 */ 136 config_search(iic_search, self, NULL); 137 138 /* 139 * Scan for known device signatures. 140 */ 141 if (iba->iba_bus_scan) 142 (iba->iba_bus_scan)(self, aux, iba->iba_bus_scan_arg); 143 else 144 iic_scan(self, aux); 145 } 146 147 int 148 iic_is_compatible(const struct i2c_attach_args *ia, const char *name) 149 { 150 const char *end, *entry; 151 152 if (ia->ia_namelen > 0) { 153 /* ia_name points to a concatenation of strings. */ 154 entry = ia->ia_name; 155 end = entry + ia->ia_namelen; 156 while (entry < end) { 157 if (strcmp(entry, name) == 0) 158 return (1); 159 entry += strlen(entry) + 1; 160 } 161 } else { 162 /* ia_name points to a string. */ 163 if (strcmp(ia->ia_name, name) == 0) 164 return (1); 165 } 166 167 return (0); 168 } 169