auvitek_i2c.c revision 1.9
1 /* $NetBSD: auvitek_i2c.c,v 1.9 2025/09/15 13:23:03 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2010 Jared D. McNeill <jmcneill (at) invisible.ca> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* 30 * Auvitek AU0828 USB controller - I2C access ops 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: auvitek_i2c.c,v 1.9 2025/09/15 13:23:03 thorpej Exp $"); 35 36 #ifdef _KERNEL_OPT 37 #include "opt_usb.h" 38 #endif 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/device.h> 43 #include <sys/conf.h> 44 #include <sys/bus.h> 45 #include <sys/module.h> 46 47 #include <dev/usb/usb.h> 48 #include <dev/usb/usbdi.h> 49 #include <dev/usb/usbdi_util.h> 50 #include <dev/usb/usbdevs.h> 51 52 #include <dev/i2c/i2cvar.h> 53 54 #include <dev/usb/auvitekreg.h> 55 #include <dev/usb/auvitekvar.h> 56 57 /* #define AUVITEK_I2C_DEBUG */ 58 59 static int auvitek_i2c_exec(void *, i2c_op_t, i2c_addr_t, 60 const void *, size_t, void *, size_t, int); 61 62 static int auvitek_i2c_read(struct auvitek_softc *, i2c_addr_t, 63 uint8_t *, size_t); 64 static int auvitek_i2c_write(struct auvitek_softc *, i2c_addr_t, 65 const uint8_t *, size_t); 66 static bool auvitek_i2c_wait(struct auvitek_softc *); 67 static bool auvitek_i2c_wait_rdack(struct auvitek_softc *); 68 static bool auvitek_i2c_wait_rddone(struct auvitek_softc *); 69 static bool auvitek_i2c_wait_wrdone(struct auvitek_softc *); 70 71 int 72 auvitek_i2c_attach(struct auvitek_softc *sc) 73 { 74 75 iic_tag_init(&sc->sc_i2c); 76 sc->sc_i2c.ic_cookie = sc; 77 sc->sc_i2c.ic_exec = auvitek_i2c_exec; 78 79 auvitek_i2c_rescan(sc, NULL, NULL); 80 81 sc->sc_i2c_attached = true; 82 83 return 0; 84 } 85 86 int 87 auvitek_i2c_detach(struct auvitek_softc *sc, int flags) 88 { 89 90 if (!sc->sc_i2c_attached) 91 return 0; 92 93 iic_tag_fini(&sc->sc_i2c); 94 95 return 0; 96 } 97 98 void 99 auvitek_i2c_rescan(struct auvitek_softc *sc, const char *ifattr, 100 const int *locs) 101 { 102 #ifdef AUVITEK_I2C_DEBUG 103 if (ifattr_match(ifattr, "i2cbus") && sc->sc_i2cdev == NULL) { 104 sc->sc_i2cdev = iicbus_attach(sc->sc_dev, &sc->sc_i2c); 105 } 106 #endif 107 } 108 109 void 110 auvitek_i2c_childdet(struct auvitek_softc *sc, device_t child) 111 { 112 if (sc->sc_i2cdev == child) 113 sc->sc_i2cdev = NULL; 114 } 115 116 static int 117 auvitek_i2c_exec(void *opaque, i2c_op_t op, i2c_addr_t addr, 118 const void *cmd, size_t cmdlen, void *vbuf, size_t buflen, int flags) 119 { 120 struct auvitek_softc *sc = opaque; 121 122 if (I2C_OP_READ_P(op)) 123 return auvitek_i2c_read(sc, addr, vbuf, buflen); 124 else 125 return auvitek_i2c_write(sc, addr, cmd, cmdlen); 126 } 127 128 static int 129 auvitek_i2c_read(struct auvitek_softc *sc, i2c_addr_t addr, 130 uint8_t *buf, size_t buflen) 131 { 132 uint8_t v; 133 unsigned int i; 134 135 auvitek_write_1(sc, AU0828_REG_I2C_MBMODE, 1); 136 auvitek_write_1(sc, AU0828_REG_I2C_CLKDIV, sc->sc_i2c_clkdiv); 137 auvitek_write_1(sc, AU0828_REG_I2C_DSTADDR, addr << 1); 138 139 if (buflen == 0) { 140 auvitek_write_1(sc, AU0828_REG_I2C_TRIGGER, 141 AU0828_I2C_TRIGGER_RD); 142 if (auvitek_i2c_wait_rdack(sc) == false) 143 return EBUSY; 144 return 0; 145 } 146 147 for (i = 0; i < buflen; i++) { 148 v = AU0828_I2C_TRIGGER_RD; 149 if (i < (buflen - 1)) 150 v |= AU0828_I2C_TRIGGER_HOLD; 151 auvitek_write_1(sc, AU0828_REG_I2C_TRIGGER, v); 152 153 if (auvitek_i2c_wait_rddone(sc) == false) 154 return EBUSY; 155 156 buf[i] = auvitek_read_1(sc, AU0828_REG_I2C_FIFORD); 157 } 158 159 if (auvitek_i2c_wait(sc) == false) 160 return EBUSY; 161 162 return 0; 163 } 164 165 static int 166 auvitek_i2c_write(struct auvitek_softc *sc, i2c_addr_t addr, 167 const uint8_t *buf, size_t buflen) 168 { 169 uint8_t v; 170 unsigned int i, fifolen; 171 172 auvitek_write_1(sc, AU0828_REG_I2C_MBMODE, 1); 173 auvitek_write_1(sc, AU0828_REG_I2C_CLKDIV, sc->sc_i2c_clkdiv); 174 auvitek_write_1(sc, AU0828_REG_I2C_DSTADDR, addr << 1); 175 176 if (buflen == 0) { 177 auvitek_write_1(sc, AU0828_REG_I2C_TRIGGER, 178 AU0828_I2C_TRIGGER_RD); 179 if (auvitek_i2c_wait(sc) == false) 180 return EBUSY; 181 if (auvitek_i2c_wait_rdack(sc) == false) 182 return EBUSY; 183 return 0; 184 } 185 186 fifolen = 0; 187 for (i = 0; i < buflen; i++) { 188 v = AU0828_I2C_TRIGGER_WR; 189 if (i < (buflen - 1)) 190 v |= AU0828_I2C_TRIGGER_HOLD; 191 192 auvitek_write_1(sc, AU0828_REG_I2C_FIFOWR, buf[i]); 193 ++fifolen; 194 195 if (fifolen == 4 || i == (buflen - 1)) { 196 auvitek_write_1(sc, AU0828_REG_I2C_TRIGGER, v); 197 fifolen = 0; 198 199 if (auvitek_i2c_wait_wrdone(sc) == false) 200 return EBUSY; 201 } 202 } 203 204 if (auvitek_i2c_wait(sc) == false) 205 return EBUSY; 206 207 return 0; 208 } 209 210 static bool 211 auvitek_i2c_wait(struct auvitek_softc *sc) 212 { 213 uint8_t status; 214 int retry = 1000; 215 216 while (--retry > 0) { 217 status = auvitek_read_1(sc, AU0828_REG_I2C_STATUS); 218 if (!(status & AU0828_I2C_STATUS_BUSY)) 219 break; 220 delay(10); 221 } 222 if (retry == 0) 223 return false; 224 225 return true; 226 } 227 228 static bool 229 auvitek_i2c_wait_rdack(struct auvitek_softc *sc) 230 { 231 uint8_t status; 232 int retry = 1000; 233 234 while (--retry > 0) { 235 status = auvitek_read_1(sc, AU0828_REG_I2C_STATUS); 236 if (!(status & AU0828_I2C_STATUS_NO_RD_ACK)) 237 break; 238 delay(10); 239 } 240 if (retry == 0) 241 return false; 242 243 return true; 244 } 245 246 static bool 247 auvitek_i2c_wait_rddone(struct auvitek_softc *sc) 248 { 249 uint8_t status; 250 int retry = 1000; 251 252 while (--retry > 0) { 253 status = auvitek_read_1(sc, AU0828_REG_I2C_STATUS); 254 if (status & AU0828_I2C_STATUS_RD_DONE) 255 break; 256 delay(10); 257 } 258 if (retry == 0) 259 return false; 260 261 return true; 262 } 263 264 static bool 265 auvitek_i2c_wait_wrdone(struct auvitek_softc *sc) 266 { 267 uint8_t status; 268 int retry = 1000; 269 270 while (--retry > 0) { 271 status = auvitek_read_1(sc, AU0828_REG_I2C_STATUS); 272 if (status & AU0828_I2C_STATUS_WR_DONE) 273 break; 274 delay(10); 275 } 276 if (retry == 0) 277 return false; 278 279 return true; 280 } 281
Indexes created Fri Sep 26 20:09:58 GMT 2025