1 /* $OpenBSD: i2c.c,v 1.15 2007/10/09 16:57:47 deraadt 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 #include <sys/conf.h> 44 45 #define _I2C_PRIVATE 46 #include <dev/i2c/i2cvar.h> 47 48 #define IICCF_ADDR 0 49 #define IICCF_SIZE 1 50 51 struct iic_softc { 52 struct device sc_dev; 53 i2c_tag_t sc_tag; 54 }; 55 56 int iic_match(struct device *, void *, void *); 57 void iic_attach(struct device *, struct device *, void *); 58 int iic_search(struct device *, void *, void *); 59 60 struct cfattach iic_ca = { 61 sizeof (struct iic_softc), 62 iic_match, 63 iic_attach 64 }; 65 66 struct cfdriver iic_cd = { 67 NULL, "iic", DV_DULL 68 }; 69 70 int 71 iicbus_print(void *aux, const char *pnp) 72 { 73 struct i2cbus_attach_args *iba = aux; 74 75 if (pnp != NULL) 76 printf("%s at %s", iba->iba_name, pnp); 77 78 return (UNCONF); 79 } 80 81 int 82 iic_print(void *aux, const char *pnp) 83 { 84 struct i2c_attach_args *ia = aux; 85 86 if (pnp != NULL) 87 printf("\"%s\" at %s", ia->ia_name, pnp); 88 printf(" addr 0x%x", ia->ia_addr); 89 90 return (UNCONF); 91 } 92 93 int 94 iic_search(struct device *parent, void *arg, void *aux) 95 { 96 struct iic_softc *sc = (void *) parent; 97 struct cfdata *cf = arg; 98 struct i2c_attach_args ia; 99 100 if (cf->cf_loc[IICCF_ADDR] != -1) { 101 memset(&ia, 0, sizeof(ia)); 102 ia.ia_tag = sc->sc_tag; 103 ia.ia_addr = cf->cf_loc[IICCF_ADDR]; 104 ia.ia_size = cf->cf_loc[IICCF_SIZE]; 105 ia.ia_name = "unknown"; 106 107 if (cf->cf_attach->ca_match(parent, cf, &ia) > 0) 108 config_attach(parent, cf, &ia, iic_print); 109 } 110 return (0); 111 } 112 113 int 114 iic_match(struct device *parent, void *arg, void *aux) 115 { 116 struct cfdata *cf = arg; 117 struct i2cbus_attach_args *iba = aux; 118 119 /* Just make sure we're looking for i2c. */ 120 return (strcmp(iba->iba_name, cf->cf_driver->cd_name) == 0); 121 } 122 123 void 124 iic_attach(struct device *parent, struct device *self, void *aux) 125 { 126 struct iic_softc *sc = (void *) self; 127 struct i2cbus_attach_args *iba = aux; 128 129 sc->sc_tag = iba->iba_tag; 130 131 printf("\n"); 132 133 /* 134 * Attach all i2c devices described in the kernel 135 * configuration file. 136 */ 137 config_search(iic_search, self, NULL); 138 139 /* 140 * Scan for known device signatures. 141 */ 142 if (iba->iba_bus_scan) 143 (iba->iba_bus_scan)(self, aux, iba->iba_bus_scan_arg); 144 else 145 iic_scan(self, aux); 146 } 147