pca9564.c revision 1.1.2.2
1 1.1.2.2 uebayasi /* $NetBSD: pca9564.c,v 1.1.2.2 2010/04/30 14:43:20 uebayasi Exp $ */ 2 1.1.2.2 uebayasi 3 1.1.2.2 uebayasi /* 4 1.1.2.2 uebayasi * Copyright (c) 2010 NONAKA Kimihiro <nonaka (at) netbsd.org> 5 1.1.2.2 uebayasi * All rights reserved. 6 1.1.2.2 uebayasi * 7 1.1.2.2 uebayasi * Redistribution and use in source and binary forms, with or without 8 1.1.2.2 uebayasi * modification, are permitted provided that the following conditions 9 1.1.2.2 uebayasi * are met: 10 1.1.2.2 uebayasi * 1. Redistributions of source code must retain the above copyright 11 1.1.2.2 uebayasi * notice, this list of conditions and the following disclaimer. 12 1.1.2.2 uebayasi * 2. Redistributions in binary form must reproduce the above copyright 13 1.1.2.2 uebayasi * notice, this list of conditions and the following disclaimer in the 14 1.1.2.2 uebayasi * documentation and/or other materials provided with the distribution. 15 1.1.2.2 uebayasi * 16 1.1.2.2 uebayasi * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 1.1.2.2 uebayasi * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 1.1.2.2 uebayasi * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 1.1.2.2 uebayasi * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 1.1.2.2 uebayasi * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 1.1.2.2 uebayasi * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 1.1.2.2 uebayasi * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 1.1.2.2 uebayasi * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 1.1.2.2 uebayasi * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 1.1.2.2 uebayasi * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 1.1.2.2 uebayasi */ 27 1.1.2.2 uebayasi 28 1.1.2.2 uebayasi #include <sys/cdefs.h> 29 1.1.2.2 uebayasi __KERNEL_RCSID(0, "$NetBSD: pca9564.c,v 1.1.2.2 2010/04/30 14:43:20 uebayasi Exp $"); 30 1.1.2.2 uebayasi 31 1.1.2.2 uebayasi #include <sys/param.h> 32 1.1.2.2 uebayasi #include <sys/device.h> 33 1.1.2.2 uebayasi #include <sys/mutex.h> 34 1.1.2.2 uebayasi #include <sys/bus.h> 35 1.1.2.2 uebayasi 36 1.1.2.2 uebayasi #include <dev/i2c/i2cvar.h> 37 1.1.2.2 uebayasi 38 1.1.2.2 uebayasi #include <dev/ic/pca9564reg.h> 39 1.1.2.2 uebayasi #include <dev/ic/pca9564var.h> 40 1.1.2.2 uebayasi 41 1.1.2.2 uebayasi #if defined(PCA9564_DEBUG) 42 1.1.2.2 uebayasi int pca9564debug = 0; 43 1.1.2.2 uebayasi #define DPRINTF(s) if (pca9564debug) printf s 44 1.1.2.2 uebayasi #else 45 1.1.2.2 uebayasi #define DPRINTF(s) 46 1.1.2.2 uebayasi #endif 47 1.1.2.2 uebayasi 48 1.1.2.2 uebayasi static int pca9564_acquire_bus(void *, int); 49 1.1.2.2 uebayasi static void pca9564_release_bus(void *, int); 50 1.1.2.2 uebayasi 51 1.1.2.2 uebayasi static int pca9564_send_start(void *, int); 52 1.1.2.2 uebayasi static int pca9564_send_stop(void *, int); 53 1.1.2.2 uebayasi static int pca9564_initiate_xfer(void *, uint16_t, int); 54 1.1.2.2 uebayasi static int pca9564_read_byte(void *, uint8_t *, int); 55 1.1.2.2 uebayasi static int pca9564_write_byte(void *, uint8_t, int); 56 1.1.2.2 uebayasi 57 1.1.2.2 uebayasi static int pca9564_ack(void *, bool, int); 58 1.1.2.2 uebayasi 59 1.1.2.2 uebayasi #define CSR_READ(sc, r) (*sc->sc_ios.read_byte)(sc->sc_dev, r) 60 1.1.2.2 uebayasi #define CSR_WRITE(sc, r, v) (*sc->sc_ios.write_byte)(sc->sc_dev, r, v) 61 1.1.2.2 uebayasi 62 1.1.2.2 uebayasi void 63 1.1.2.2 uebayasi pca9564_attach(struct pca9564_softc *sc) 64 1.1.2.2 uebayasi { 65 1.1.2.2 uebayasi struct i2cbus_attach_args iba; 66 1.1.2.2 uebayasi 67 1.1.2.2 uebayasi aprint_naive("\n"); 68 1.1.2.2 uebayasi aprint_normal(": PCA9564 I2C Controller\n"); 69 1.1.2.2 uebayasi 70 1.1.2.2 uebayasi mutex_init(&sc->sc_buslock, MUTEX_DEFAULT, IPL_NONE); 71 1.1.2.2 uebayasi 72 1.1.2.2 uebayasi sc->sc_i2c.ic_cookie = sc; 73 1.1.2.2 uebayasi sc->sc_i2c.ic_acquire_bus = pca9564_acquire_bus; 74 1.1.2.2 uebayasi sc->sc_i2c.ic_release_bus = pca9564_release_bus; 75 1.1.2.2 uebayasi sc->sc_i2c.ic_send_start = pca9564_send_start; 76 1.1.2.2 uebayasi sc->sc_i2c.ic_send_stop = pca9564_send_stop; 77 1.1.2.2 uebayasi sc->sc_i2c.ic_initiate_xfer = pca9564_initiate_xfer; 78 1.1.2.2 uebayasi sc->sc_i2c.ic_read_byte = pca9564_read_byte; 79 1.1.2.2 uebayasi sc->sc_i2c.ic_write_byte = pca9564_write_byte; 80 1.1.2.2 uebayasi sc->sc_i2c.ic_exec = NULL; 81 1.1.2.2 uebayasi 82 1.1.2.2 uebayasi /* set serial clock rate */ 83 1.1.2.2 uebayasi switch (sc->sc_i2c_clock) { 84 1.1.2.2 uebayasi case 330000: /* 330kHz */ 85 1.1.2.2 uebayasi sc->sc_i2c_clock = I2CCON_CR_330KHZ; 86 1.1.2.2 uebayasi break; 87 1.1.2.2 uebayasi case 288000: /* 288kHz */ 88 1.1.2.2 uebayasi sc->sc_i2c_clock = I2CCON_CR_288KHZ; 89 1.1.2.2 uebayasi break; 90 1.1.2.2 uebayasi case 217000: /* 217kHz */ 91 1.1.2.2 uebayasi sc->sc_i2c_clock = I2CCON_CR_217KHZ; 92 1.1.2.2 uebayasi break; 93 1.1.2.2 uebayasi case 146000: /* 146kHz */ 94 1.1.2.2 uebayasi sc->sc_i2c_clock = I2CCON_CR_146KHZ; 95 1.1.2.2 uebayasi break; 96 1.1.2.2 uebayasi case 88000: /* 88kHz */ 97 1.1.2.2 uebayasi sc->sc_i2c_clock = I2CCON_CR_88KHZ; 98 1.1.2.2 uebayasi break; 99 1.1.2.2 uebayasi case 0: /* default */ 100 1.1.2.2 uebayasi case 59000: /* 59kHz */ 101 1.1.2.2 uebayasi sc->sc_i2c_clock = I2CCON_CR_59KHZ; 102 1.1.2.2 uebayasi break; 103 1.1.2.2 uebayasi case 44000: /* 44kHz */ 104 1.1.2.2 uebayasi sc->sc_i2c_clock = I2CCON_CR_44KHZ; 105 1.1.2.2 uebayasi break; 106 1.1.2.2 uebayasi case 36000: /* 36kHz */ 107 1.1.2.2 uebayasi sc->sc_i2c_clock = I2CCON_CR_36KHZ; 108 1.1.2.2 uebayasi break; 109 1.1.2.2 uebayasi default: 110 1.1.2.2 uebayasi aprint_error_dev(sc->sc_dev, "unknown i2c clock %dHz\n", 111 1.1.2.2 uebayasi sc->sc_i2c_clock); 112 1.1.2.2 uebayasi sc->sc_i2c_clock = I2CCON_CR_59KHZ; 113 1.1.2.2 uebayasi break; 114 1.1.2.2 uebayasi } 115 1.1.2.2 uebayasi 116 1.1.2.2 uebayasi iba.iba_tag = &sc->sc_i2c; 117 1.1.2.2 uebayasi (void) config_found_ia(sc->sc_dev, "i2cbus", &iba, iicbus_print); 118 1.1.2.2 uebayasi } 119 1.1.2.2 uebayasi 120 1.1.2.2 uebayasi static int 121 1.1.2.2 uebayasi pca9564_acquire_bus(void *cookie, int flags) 122 1.1.2.2 uebayasi { 123 1.1.2.2 uebayasi struct pca9564_softc *sc = cookie; 124 1.1.2.2 uebayasi uint8_t control; 125 1.1.2.2 uebayasi 126 1.1.2.2 uebayasi mutex_enter(&sc->sc_buslock); 127 1.1.2.2 uebayasi 128 1.1.2.2 uebayasi /* Enable SIO and set clock */ 129 1.1.2.2 uebayasi control = CSR_READ(sc, PCA9564_I2CCON); 130 1.1.2.2 uebayasi control |= I2CCON_ENSIO; 131 1.1.2.2 uebayasi control &= ~(I2CCON_STA|I2CCON_STO|I2CCON_SI|I2CCON_AA); 132 1.1.2.2 uebayasi control &= ~I2CCON_CR_MASK; 133 1.1.2.2 uebayasi control |= sc->sc_i2c_clock; 134 1.1.2.2 uebayasi CSR_WRITE(sc, PCA9564_I2CCON, control); 135 1.1.2.2 uebayasi delay(500); 136 1.1.2.2 uebayasi 137 1.1.2.2 uebayasi return 0; 138 1.1.2.2 uebayasi } 139 1.1.2.2 uebayasi 140 1.1.2.2 uebayasi static void 141 1.1.2.2 uebayasi pca9564_release_bus(void *cookie, int flags) 142 1.1.2.2 uebayasi { 143 1.1.2.2 uebayasi struct pca9564_softc *sc = cookie; 144 1.1.2.2 uebayasi uint8_t control; 145 1.1.2.2 uebayasi 146 1.1.2.2 uebayasi /* Disable SIO */ 147 1.1.2.2 uebayasi control = CSR_READ(sc, PCA9564_I2CCON); 148 1.1.2.2 uebayasi control &= ~I2CCON_ENSIO; 149 1.1.2.2 uebayasi CSR_WRITE(sc, PCA9564_I2CCON, control); 150 1.1.2.2 uebayasi 151 1.1.2.2 uebayasi mutex_exit(&sc->sc_buslock); 152 1.1.2.2 uebayasi } 153 1.1.2.2 uebayasi 154 1.1.2.2 uebayasi #define PCA9564_TIMEOUT 100 /* protocol timeout, in uSecs */ 155 1.1.2.2 uebayasi 156 1.1.2.2 uebayasi static int 157 1.1.2.2 uebayasi pca9564_wait(struct pca9564_softc *sc, int flags) 158 1.1.2.2 uebayasi { 159 1.1.2.2 uebayasi int timeout; 160 1.1.2.2 uebayasi 161 1.1.2.2 uebayasi DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); 162 1.1.2.2 uebayasi for (timeout = PCA9564_TIMEOUT; timeout > 0; timeout--) { 163 1.1.2.2 uebayasi if (CSR_READ(sc, PCA9564_I2CCON) & I2CCON_SI) 164 1.1.2.2 uebayasi break; 165 1.1.2.2 uebayasi delay(1); 166 1.1.2.2 uebayasi } 167 1.1.2.2 uebayasi DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); 168 1.1.2.2 uebayasi if (timeout == 0) { 169 1.1.2.2 uebayasi aprint_error_dev(sc->sc_dev, "timeout\n"); 170 1.1.2.2 uebayasi return ETIMEDOUT; 171 1.1.2.2 uebayasi } 172 1.1.2.2 uebayasi return 0; 173 1.1.2.2 uebayasi } 174 1.1.2.2 uebayasi 175 1.1.2.2 uebayasi static int 176 1.1.2.2 uebayasi pca9564_send_start(void *cookie, int flags) 177 1.1.2.2 uebayasi { 178 1.1.2.2 uebayasi struct pca9564_softc *sc = cookie; 179 1.1.2.2 uebayasi uint8_t control; 180 1.1.2.2 uebayasi 181 1.1.2.2 uebayasi DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); 182 1.1.2.2 uebayasi control = CSR_READ(sc, PCA9564_I2CCON); 183 1.1.2.2 uebayasi control |= I2CCON_STA; 184 1.1.2.2 uebayasi control &= ~(I2CCON_STO|I2CCON_SI); 185 1.1.2.2 uebayasi CSR_WRITE(sc, PCA9564_I2CCON, control); 186 1.1.2.2 uebayasi DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); 187 1.1.2.2 uebayasi 188 1.1.2.2 uebayasi return pca9564_wait(sc, flags); 189 1.1.2.2 uebayasi } 190 1.1.2.2 uebayasi 191 1.1.2.2 uebayasi static int 192 1.1.2.2 uebayasi pca9564_send_stop(void *cookie, int flags) 193 1.1.2.2 uebayasi { 194 1.1.2.2 uebayasi struct pca9564_softc *sc = cookie; 195 1.1.2.2 uebayasi uint8_t control; 196 1.1.2.2 uebayasi 197 1.1.2.2 uebayasi DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); 198 1.1.2.2 uebayasi control = CSR_READ(sc, PCA9564_I2CCON); 199 1.1.2.2 uebayasi control |= I2CCON_STO; 200 1.1.2.2 uebayasi control &= ~(I2CCON_STA|I2CCON_SI); 201 1.1.2.2 uebayasi CSR_WRITE(sc, PCA9564_I2CCON, control); 202 1.1.2.2 uebayasi DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); 203 1.1.2.2 uebayasi 204 1.1.2.2 uebayasi return 0; 205 1.1.2.2 uebayasi } 206 1.1.2.2 uebayasi 207 1.1.2.2 uebayasi static int 208 1.1.2.2 uebayasi pca9564_initiate_xfer(void *cookie, uint16_t addr, int flags) 209 1.1.2.2 uebayasi { 210 1.1.2.2 uebayasi struct pca9564_softc *sc = cookie; 211 1.1.2.2 uebayasi int error, rd_req = (flags & I2C_F_READ) != 0; 212 1.1.2.2 uebayasi uint8_t data, control; 213 1.1.2.2 uebayasi 214 1.1.2.2 uebayasi error = pca9564_send_start(sc, flags); 215 1.1.2.2 uebayasi if (error) { 216 1.1.2.2 uebayasi aprint_error_dev(sc->sc_dev, "failed to send start %s xfer\n", 217 1.1.2.2 uebayasi rd_req ? "read" : "write"); 218 1.1.2.2 uebayasi return error; 219 1.1.2.2 uebayasi } 220 1.1.2.2 uebayasi 221 1.1.2.2 uebayasi DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); 222 1.1.2.2 uebayasi control = CSR_READ(sc, PCA9564_I2CCON); 223 1.1.2.2 uebayasi 224 1.1.2.2 uebayasi data = (addr << 1) | (rd_req ? 1 : 0); 225 1.1.2.2 uebayasi CSR_WRITE(sc, PCA9564_I2CDAT, data); 226 1.1.2.2 uebayasi 227 1.1.2.2 uebayasi control &= ~(I2CCON_STO|I2CCON_STA|I2CCON_SI); 228 1.1.2.2 uebayasi CSR_WRITE(sc, PCA9564_I2CCON, control); 229 1.1.2.2 uebayasi DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); 230 1.1.2.2 uebayasi 231 1.1.2.2 uebayasi error = pca9564_wait(sc, flags); 232 1.1.2.2 uebayasi if (error) 233 1.1.2.2 uebayasi aprint_error_dev(sc->sc_dev, "failed to initiate %s xfer\n", 234 1.1.2.2 uebayasi rd_req ? "read" : "write"); 235 1.1.2.2 uebayasi return error; 236 1.1.2.2 uebayasi } 237 1.1.2.2 uebayasi 238 1.1.2.2 uebayasi static int 239 1.1.2.2 uebayasi pca9564_read_byte(void *cookie, uint8_t *bytep, int flags) 240 1.1.2.2 uebayasi { 241 1.1.2.2 uebayasi struct pca9564_softc *sc = cookie; 242 1.1.2.2 uebayasi int send_stop = (flags & I2C_F_STOP) != 0; 243 1.1.2.2 uebayasi int error; 244 1.1.2.2 uebayasi 245 1.1.2.2 uebayasi error = pca9564_ack(sc, !send_stop, flags); 246 1.1.2.2 uebayasi if (error) { 247 1.1.2.2 uebayasi aprint_error_dev(sc->sc_dev, "failed to ack\n"); 248 1.1.2.2 uebayasi return error; 249 1.1.2.2 uebayasi } 250 1.1.2.2 uebayasi 251 1.1.2.2 uebayasi DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); 252 1.1.2.2 uebayasi *bytep = CSR_READ(sc, PCA9564_I2CDAT); 253 1.1.2.2 uebayasi DPRINTF(("%s: status=%#x, byte=%#x\n", __func__, 254 1.1.2.2 uebayasi CSR_READ(sc, PCA9564_I2CSTA), *bytep)); 255 1.1.2.2 uebayasi 256 1.1.2.2 uebayasi if (send_stop) 257 1.1.2.2 uebayasi pca9564_send_stop(sc, flags); 258 1.1.2.2 uebayasi 259 1.1.2.2 uebayasi return 0; 260 1.1.2.2 uebayasi } 261 1.1.2.2 uebayasi 262 1.1.2.2 uebayasi static int 263 1.1.2.2 uebayasi pca9564_write_byte(void *cookie, uint8_t byte, int flags) 264 1.1.2.2 uebayasi { 265 1.1.2.2 uebayasi struct pca9564_softc *sc = cookie; 266 1.1.2.2 uebayasi int send_stop = (flags & I2C_F_STOP) != 0; 267 1.1.2.2 uebayasi int error; 268 1.1.2.2 uebayasi uint8_t control; 269 1.1.2.2 uebayasi 270 1.1.2.2 uebayasi DPRINTF(("%s: status=%#x, byte=%#x\n", __func__, 271 1.1.2.2 uebayasi CSR_READ(sc, PCA9564_I2CSTA), byte)); 272 1.1.2.2 uebayasi control = CSR_READ(sc, PCA9564_I2CCON); 273 1.1.2.2 uebayasi 274 1.1.2.2 uebayasi CSR_WRITE(sc, PCA9564_I2CDAT, byte); 275 1.1.2.2 uebayasi 276 1.1.2.2 uebayasi control &= ~(I2CCON_STO|I2CCON_STA|I2CCON_SI); 277 1.1.2.2 uebayasi CSR_WRITE(sc, PCA9564_I2CCON, control); 278 1.1.2.2 uebayasi DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); 279 1.1.2.2 uebayasi 280 1.1.2.2 uebayasi error = pca9564_wait(sc, flags); 281 1.1.2.2 uebayasi if (error) 282 1.1.2.2 uebayasi aprint_error_dev(sc->sc_dev, "write byte failed\n"); 283 1.1.2.2 uebayasi 284 1.1.2.2 uebayasi if (send_stop) 285 1.1.2.2 uebayasi pca9564_send_stop(sc, flags); 286 1.1.2.2 uebayasi 287 1.1.2.2 uebayasi return error; 288 1.1.2.2 uebayasi } 289 1.1.2.2 uebayasi 290 1.1.2.2 uebayasi static int 291 1.1.2.2 uebayasi pca9564_ack(void *cookie, bool ack, int flags) 292 1.1.2.2 uebayasi { 293 1.1.2.2 uebayasi struct pca9564_softc *sc = cookie; 294 1.1.2.2 uebayasi uint8_t control; 295 1.1.2.2 uebayasi 296 1.1.2.2 uebayasi DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); 297 1.1.2.2 uebayasi control = CSR_READ(sc, PCA9564_I2CCON); 298 1.1.2.2 uebayasi control &= ~(I2CCON_STO|I2CCON_STA|I2CCON_SI|I2CCON_AA); 299 1.1.2.2 uebayasi if (ack) 300 1.1.2.2 uebayasi control |= I2CCON_AA; 301 1.1.2.2 uebayasi CSR_WRITE(sc, PCA9564_I2CCON, control); 302 1.1.2.2 uebayasi DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); 303 1.1.2.2 uebayasi 304 1.1.2.2 uebayasi return pca9564_wait(sc, flags); 305 1.1.2.2 uebayasi } 306
Indexes created Mon Oct 27 20:09:55 GMT 2025