auvitek_i2c.c revision 1.6
1 /* $NetBSD: auvitek_i2c.c,v 1.6 2021/04/24 23:36:59 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 1.6 2021/04/24 23:36:59 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 iic_tag_init(&sc->sc_i2c); 75 sc->sc_i2c.ic_cookie = sc; 76 sc->sc_i2c.ic_exec = auvitek_i2c_exec; 77 78 auvitek_i2c_rescan(sc, NULL, NULL); 79 80 return 0; 81 } 82 83 int 84 auvitek_i2c_detach(struct auvitek_softc *sc, int flags) 85 { 86 iic_tag_fini(&sc->sc_i2c); 87 88 if (sc->sc_i2cdev) 89 config_detach(sc->sc_i2cdev, flags); 90 91 return 0; 92 } 93 94 void 95 auvitek_i2c_rescan(struct auvitek_softc *sc, const char *ifattr, 96 const int *locs) 97 { 98 #ifdef AUVITEK_I2C_DEBUG 99 struct i2cbus_attach_args iba; 100 101 if (ifattr_match(ifattr, "i2cbus") && sc->sc_i2cdev == NULL) { 102 memset(&iba, 0, sizeof(iba)); 103 iba.iba_tag = &sc->sc_i2c; 104 sc->sc_i2cdev = config_found(sc->sc_dev, &iba, iicbus_print, 105 CFARG_IATTR, "i2cbus", 106 CFARG_EOL); 107 } 108 #endif 109 } 110 111 void 112 auvitek_i2c_childdet(struct auvitek_softc *sc, device_t child) 113 { 114 if (sc->sc_i2cdev == child) 115 sc->sc_i2cdev = NULL; 116 } 117 118 static int 119 auvitek_i2c_exec(void *opaque, i2c_op_t op, i2c_addr_t addr, 120 const void *cmd, size_t cmdlen, void *vbuf, size_t buflen, int flags) 121 { 122 struct auvitek_softc *sc = opaque; 123 124 if (I2C_OP_READ_P(op)) 125 return auvitek_i2c_read(sc, addr, vbuf, buflen); 126 else 127 return auvitek_i2c_write(sc, addr, cmd, cmdlen); 128 } 129 130 static int 131 auvitek_i2c_read(struct auvitek_softc *sc, i2c_addr_t addr, 132 uint8_t *buf, size_t buflen) 133 { 134 uint8_t v; 135 unsigned int i; 136 137 auvitek_write_1(sc, AU0828_REG_I2C_MBMODE, 1); 138 auvitek_write_1(sc, AU0828_REG_I2C_CLKDIV, sc->sc_i2c_clkdiv); 139 auvitek_write_1(sc, AU0828_REG_I2C_DSTADDR, addr << 1); 140 141 if (buflen == 0) { 142 auvitek_write_1(sc, AU0828_REG_I2C_TRIGGER, 143 AU0828_I2C_TRIGGER_RD); 144 if (auvitek_i2c_wait_rdack(sc) == false) 145 return EBUSY; 146 return 0; 147 } 148 149 for (i = 0; i < buflen; i++) { 150 v = AU0828_I2C_TRIGGER_RD; 151 if (i < (buflen - 1)) 152 v |= AU0828_I2C_TRIGGER_HOLD; 153 auvitek_write_1(sc, AU0828_REG_I2C_TRIGGER, v); 154 155 if (auvitek_i2c_wait_rddone(sc) == false) 156 return EBUSY; 157 158 buf[i] = auvitek_read_1(sc, AU0828_REG_I2C_FIFORD); 159 } 160 161 if (auvitek_i2c_wait(sc) == false) 162 return EBUSY; 163 164 return 0; 165 } 166 167 static int 168 auvitek_i2c_write(struct auvitek_softc *sc, i2c_addr_t addr, 169 const uint8_t *buf, size_t buflen) 170 { 171 uint8_t v; 172 unsigned int i, fifolen; 173 174 auvitek_write_1(sc, AU0828_REG_I2C_MBMODE, 1); 175 auvitek_write_1(sc, AU0828_REG_I2C_CLKDIV, sc->sc_i2c_clkdiv); 176 auvitek_write_1(sc, AU0828_REG_I2C_DSTADDR, addr << 1); 177 178 if (buflen == 0) { 179 auvitek_write_1(sc, AU0828_REG_I2C_TRIGGER, 180 AU0828_I2C_TRIGGER_RD); 181 if (auvitek_i2c_wait(sc) == false) 182 return EBUSY; 183 if (auvitek_i2c_wait_rdack(sc) == false) 184 return EBUSY; 185 return 0; 186 } 187 188 fifolen = 0; 189 for (i = 0; i < buflen; i++) { 190 v = AU0828_I2C_TRIGGER_WR; 191 if (i < (buflen - 1)) 192 v |= AU0828_I2C_TRIGGER_HOLD; 193 194 auvitek_write_1(sc, AU0828_REG_I2C_FIFOWR, buf[i]); 195 ++fifolen; 196 197 if (fifolen == 4 || i == (buflen - 1)) { 198 auvitek_write_1(sc, AU0828_REG_I2C_TRIGGER, v); 199 fifolen = 0; 200 201 if (auvitek_i2c_wait_wrdone(sc) == false) 202 return EBUSY; 203 } 204 } 205 206 if (auvitek_i2c_wait(sc) == false) 207 return EBUSY; 208 209 return 0; 210 } 211 212 static bool 213 auvitek_i2c_wait(struct auvitek_softc *sc) 214 { 215 uint8_t status; 216 int retry = 1000; 217 218 while (--retry > 0) { 219 status = auvitek_read_1(sc, AU0828_REG_I2C_STATUS); 220 if (!(status & AU0828_I2C_STATUS_BUSY)) 221 break; 222 delay(10); 223 } 224 if (retry == 0) 225 return false; 226 227 return true; 228 } 229 230 static bool 231 auvitek_i2c_wait_rdack(struct auvitek_softc *sc) 232 { 233 uint8_t status; 234 int retry = 1000; 235 236 while (--retry > 0) { 237 status = auvitek_read_1(sc, AU0828_REG_I2C_STATUS); 238 if (!(status & AU0828_I2C_STATUS_NO_RD_ACK)) 239 break; 240 delay(10); 241 } 242 if (retry == 0) 243 return false; 244 245 return true; 246 } 247 248 static bool 249 auvitek_i2c_wait_rddone(struct auvitek_softc *sc) 250 { 251 uint8_t status; 252 int retry = 1000; 253 254 while (--retry > 0) { 255 status = auvitek_read_1(sc, AU0828_REG_I2C_STATUS); 256 if (status & AU0828_I2C_STATUS_RD_DONE) 257 break; 258 delay(10); 259 } 260 if (retry == 0) 261 return false; 262 263 return true; 264 } 265 266 static bool 267 auvitek_i2c_wait_wrdone(struct auvitek_softc *sc) 268 { 269 uint8_t status; 270 int retry = 1000; 271 272 while (--retry > 0) { 273 status = auvitek_read_1(sc, AU0828_REG_I2C_STATUS); 274 if (status & AU0828_I2C_STATUS_WR_DONE) 275 break; 276 delay(10); 277 } 278 if (retry == 0) 279 return false; 280 281 return true; 282 } 283
Indexes created Tue Sep 23 07:09:52 GMT 2025