1 /* $NetBSD: i2c.c,v 1.22 2008/09/29 22:55:08 pgoyette 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 1.22 2008/09/29 22:55:08 pgoyette 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 #include <opt_i2cbus.h> 55 56 struct iic_softc { 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(device_t parent, cfdata_t cf, const int *ldesc, void *aux) 86 { 87 struct iic_softc *sc = device_private(parent); 88 struct i2c_attach_args ia; 89 90 ia.ia_tag = sc->sc_tag; 91 ia.ia_addr = cf->cf_loc[IICCF_ADDR]; 92 ia.ia_size = cf->cf_loc[IICCF_SIZE]; 93 ia.ia_type = sc->sc_type; 94 95 if (config_match(parent, cf, &ia) > 0) 96 config_attach(parent, cf, &ia, iic_print); 97 98 return (0); 99 } 100 101 static int 102 iic_match(device_t parent, cfdata_t cf, void *aux) 103 { 104 105 return (1); 106 } 107 108 static void 109 iic_attach(device_t parent, device_t self, void *aux) 110 { 111 struct iic_softc *sc = device_private(self); 112 struct i2cbus_attach_args *iba = aux; 113 i2c_tag_t ic; 114 int rv; 115 116 aprint_naive(": I2C bus\n"); 117 aprint_normal(": I2C bus\n"); 118 119 sc->sc_tag = iba->iba_tag; 120 sc->sc_type = iba->iba_type; 121 ic = sc->sc_tag; 122 ic->ic_devname = device_xname(self); 123 124 LIST_INIT(&(sc->sc_tag->ic_list)); 125 LIST_INIT(&(sc->sc_tag->ic_proc_list)); 126 127 rv = kthread_create(PRI_NONE, 0, NULL, iic_smbus_intr_thread, 128 ic, &ic->ic_intr_thread, "%s", ic->ic_devname); 129 if (rv) 130 aprint_error_dev(self, "unable to create intr thread\n"); 131 132 #if I2C_SCAN 133 if (sc->sc_type == I2C_TYPE_SMBUS) { 134 int found = 0; 135 i2c_addr_t addr; 136 uint8_t cmd = 0, val; 137 138 for (addr = 0x0; addr < 0x80; addr++) { 139 /* Skip i2c Alert Response Address */ 140 if (addr == 0x0c) 141 continue; 142 iic_acquire_bus(ic, 0); 143 if (iic_exec(ic, I2C_OP_READ_WITH_STOP, addr, 144 &cmd, 1, &val, 1, 0) == 0) { 145 if (found == 0) 146 aprint_normal("%s: devices at", 147 ic->ic_devname); 148 found++; 149 aprint_normal(" 0x%02x", addr); 150 } 151 iic_release_bus(ic, 0); 152 } 153 if (found == 0) 154 aprint_normal("%s: no devices found", ic->ic_devname); 155 aprint_normal("\n"); 156 } 157 #endif 158 159 if (!pmf_device_register(self, NULL, NULL)) 160 aprint_error_dev(self, "couldn't establish power handler\n"); 161 162 /* 163 * Attach all i2c devices described in the kernel 164 * configuration file. 165 */ 166 config_search_ia(iic_search, self, "iic", NULL); 167 } 168 169 static void 170 iic_smbus_intr_thread(void *aux) 171 { 172 i2c_tag_t ic; 173 struct ic_intr_list *il; 174 int rv; 175 176 ic = (i2c_tag_t)aux; 177 ic->ic_running = 1; 178 ic->ic_pending = 0; 179 180 while (ic->ic_running) { 181 if (ic->ic_pending == 0) 182 rv = tsleep(ic, PZERO, "iicintr", hz); 183 if (ic->ic_pending > 0) { 184 LIST_FOREACH(il, &(ic->ic_proc_list), il_next) { 185 (*il->il_intr)(il->il_intrarg); 186 } 187 ic->ic_pending--; 188 } 189 } 190 191 kthread_exit(0); 192 } 193 194 void * 195 iic_smbus_intr_establish(i2c_tag_t ic, int (*intr)(void *), void *intrarg) 196 { 197 struct ic_intr_list *il; 198 199 il = malloc(sizeof(struct ic_intr_list), M_DEVBUF, M_WAITOK); 200 if (il == NULL) 201 return NULL; 202 203 il->il_intr = intr; 204 il->il_intrarg = intrarg; 205 206 LIST_INSERT_HEAD(&(ic->ic_list), il, il_next); 207 208 return il; 209 } 210 211 void 212 iic_smbus_intr_disestablish(i2c_tag_t ic, void *hdl) 213 { 214 struct ic_intr_list *il; 215 216 il = (struct ic_intr_list *)hdl; 217 218 LIST_REMOVE(il, il_next); 219 free(il, M_DEVBUF); 220 221 return; 222 } 223 224 void * 225 iic_smbus_intr_establish_proc(i2c_tag_t ic, int (*intr)(void *), void *intrarg) 226 { 227 struct ic_intr_list *il; 228 229 il = malloc(sizeof(struct ic_intr_list), M_DEVBUF, M_WAITOK); 230 if (il == NULL) 231 return NULL; 232 233 il->il_intr = intr; 234 il->il_intrarg = intrarg; 235 236 LIST_INSERT_HEAD(&(ic->ic_proc_list), il, il_next); 237 238 return il; 239 } 240 241 void 242 iic_smbus_intr_disestablish_proc(i2c_tag_t ic, void *hdl) 243 { 244 struct ic_intr_list *il; 245 246 il = (struct ic_intr_list *)hdl; 247 248 LIST_REMOVE(il, il_next); 249 free(il, M_DEVBUF); 250 251 return; 252 } 253 254 int 255 iic_smbus_intr(i2c_tag_t ic) 256 { 257 struct ic_intr_list *il; 258 259 LIST_FOREACH(il, &(ic->ic_list), il_next) { 260 (*il->il_intr)(il->il_intrarg); 261 } 262 263 ic->ic_pending++; 264 wakeup(ic); 265 266 return 1; 267 } 268 269 CFATTACH_DECL_NEW(iic, sizeof(struct iic_softc), 270 iic_match, iic_attach, NULL, NULL); 271