1 /* $NetBSD: i2c.c,v 1.19 2008/04/06 20:25:59 cegger Exp $ */ 2 3 /* 4 * Copyright (c) 2003 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include <sys/cdefs.h> 39 __KERNEL_RCSID(0, "$NetBSD: i2c.c,v 1.19 2008/04/06 20:25:59 cegger Exp $"); 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/device.h> 44 #include <sys/event.h> 45 #include <sys/conf.h> 46 #include <sys/malloc.h> 47 #include <sys/kthread.h> 48 #include <sys/proc.h> 49 #include <sys/kernel.h> 50 51 #include <dev/i2c/i2cvar.h> 52 53 #include "locators.h" 54 55 struct iic_softc { 56 struct device sc_dev; 57 i2c_tag_t sc_tag; 58 int sc_type; 59 }; 60 61 static void iic_smbus_intr_thread(void *); 62 63 int 64 iicbus_print(void *aux, const char *pnp) 65 { 66 67 if (pnp != NULL) 68 aprint_normal("iic at %s", pnp); 69 70 return (UNCONF); 71 } 72 73 static int 74 iic_print(void *aux, const char *pnp) 75 { 76 struct i2c_attach_args *ia = aux; 77 78 if (ia->ia_addr != (i2c_addr_t)-1) 79 aprint_normal(" addr 0x%x", ia->ia_addr); 80 81 return (UNCONF); 82 } 83 84 static int 85 iic_search(struct device *parent, struct cfdata *cf, 86 const int *ldesc, void *aux) 87 { 88 struct iic_softc *sc = (void *) parent; 89 struct i2c_attach_args ia; 90 91 ia.ia_tag = sc->sc_tag; 92 ia.ia_addr = cf->cf_loc[IICCF_ADDR]; 93 ia.ia_size = cf->cf_loc[IICCF_SIZE]; 94 ia.ia_type = sc->sc_type; 95 96 if (config_match(parent, cf, &ia) > 0) 97 config_attach(parent, cf, &ia, iic_print); 98 99 return (0); 100 } 101 102 static int 103 iic_match(struct device *parent, struct cfdata *cf, 104 void *aux) 105 { 106 107 return (1); 108 } 109 110 static void 111 iic_attach(struct device *parent, struct device *self, void *aux) 112 { 113 struct iic_softc *sc = device_private(self); 114 struct i2cbus_attach_args *iba = aux; 115 i2c_tag_t ic; 116 int rv; 117 118 aprint_naive(": I2C bus\n"); 119 aprint_normal(": I2C bus\n"); 120 121 sc->sc_tag = iba->iba_tag; 122 sc->sc_type = iba->iba_type; 123 ic = sc->sc_tag; 124 ic->ic_devname = device_xname(self); 125 126 LIST_INIT(&(sc->sc_tag->ic_list)); 127 LIST_INIT(&(sc->sc_tag->ic_proc_list)); 128 129 rv = kthread_create(PRI_NONE, 0, NULL, iic_smbus_intr_thread, 130 ic, &ic->ic_intr_thread, "%s", ic->ic_devname); 131 if (rv) 132 printf("%s: unable to create intr thread\n", ic->ic_devname); 133 134 #if notyet 135 if (sc->sc_type == I2C_TYPE_SMBUS) { 136 int found = 0; 137 i2c_addr_t addr; 138 uint8_t cmd = 0, val; 139 140 for (addr = 0x0; addr < 0x80; addr++) { 141 iic_acquire_bus(ic, 0); 142 if (iic_exec(ic, I2C_OP_READ_WITH_STOP, addr, 143 &cmd, 1, &val, 1, 0) == 0) { 144 if (found == 0) 145 aprint_normal("%s: devices at", 146 ic->ic_devname); 147 found++; 148 aprint_normal(" 0x%02x", addr); 149 } 150 iic_release_bus(ic, 0); 151 } 152 if (found == 0) 153 aprint_normal("%s: no devices found", ic->ic_devname); 154 aprint_normal("\n"); 155 } 156 #endif 157 158 if (!pmf_device_register(self, NULL, NULL)) 159 aprint_error_dev(self, "couldn't establish power handler\n"); 160 161 /* 162 * Attach all i2c devices described in the kernel 163 * configuration file. 164 */ 165 config_search_ia(iic_search, self, "iic", NULL); 166 } 167 168 static void 169 iic_smbus_intr_thread(void *aux) 170 { 171 i2c_tag_t ic; 172 struct ic_intr_list *il; 173 int rv; 174 175 ic = (i2c_tag_t)aux; 176 ic->ic_running = 1; 177 ic->ic_pending = 0; 178 179 while (ic->ic_running) { 180 if (ic->ic_pending == 0) 181 rv = tsleep(ic, PZERO, "iicintr", hz); 182 if (ic->ic_pending > 0) { 183 LIST_FOREACH(il, &(ic->ic_proc_list), il_next) { 184 (*il->il_intr)(il->il_intrarg); 185 } 186 ic->ic_pending--; 187 } 188 } 189 190 kthread_exit(0); 191 } 192 193 void * 194 iic_smbus_intr_establish(i2c_tag_t ic, int (*intr)(void *), void *intrarg) 195 { 196 struct ic_intr_list *il; 197 198 il = malloc(sizeof(struct ic_intr_list), M_DEVBUF, M_WAITOK); 199 if (il == NULL) 200 return NULL; 201 202 il->il_intr = intr; 203 il->il_intrarg = intrarg; 204 205 LIST_INSERT_HEAD(&(ic->ic_list), il, il_next); 206 207 return il; 208 } 209 210 void 211 iic_smbus_intr_disestablish(i2c_tag_t ic, void *hdl) 212 { 213 struct ic_intr_list *il; 214 215 il = (struct ic_intr_list *)hdl; 216 217 LIST_REMOVE(il, il_next); 218 free(il, M_DEVBUF); 219 220 return; 221 } 222 223 void * 224 iic_smbus_intr_establish_proc(i2c_tag_t ic, int (*intr)(void *), void *intrarg) 225 { 226 struct ic_intr_list *il; 227 228 il = malloc(sizeof(struct ic_intr_list), M_DEVBUF, M_WAITOK); 229 if (il == NULL) 230 return NULL; 231 232 il->il_intr = intr; 233 il->il_intrarg = intrarg; 234 235 LIST_INSERT_HEAD(&(ic->ic_proc_list), il, il_next); 236 237 return il; 238 } 239 240 void 241 iic_smbus_intr_disestablish_proc(i2c_tag_t ic, void *hdl) 242 { 243 struct ic_intr_list *il; 244 245 il = (struct ic_intr_list *)hdl; 246 247 LIST_REMOVE(il, il_next); 248 free(il, M_DEVBUF); 249 250 return; 251 } 252 253 int 254 iic_smbus_intr(i2c_tag_t ic) 255 { 256 struct ic_intr_list *il; 257 258 LIST_FOREACH(il, &(ic->ic_list), il_next) { 259 (*il->il_intr)(il->il_intrarg); 260 } 261 262 ic->ic_pending++; 263 wakeup(ic); 264 265 return 1; 266 } 267 268 CFATTACH_DECL(iic, sizeof(struct iic_softc), 269 iic_match, iic_attach, NULL, NULL); 270