Annotation of sys/arch/sparc64/dev/pcf8591_ofw.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: pcf8591_ofw.c,v 1.4 2007/06/24 05:34:35 dlg Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 2006 Damien Miller <djm@openbsd.org>
! 5: *
! 6: * Permission to use, copy, modify, and distribute this software for any
! 7: * purpose with or without fee is hereby granted, provided that the above
! 8: * copyright notice and this permission notice appear in all copies.
! 9: *
! 10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
! 11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
! 12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
! 13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
! 14: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
! 15: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
! 16: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
! 17: */
! 18:
! 19: #include <sys/param.h>
! 20: #include <sys/systm.h>
! 21: #include <sys/device.h>
! 22: #include <sys/sensors.h>
! 23:
! 24: #include <dev/ofw/openfirm.h>
! 25: #include <dev/i2c/i2cvar.h>
! 26:
! 27: #define PCF8591_CHANNELS 4
! 28:
! 29: struct pcfadc_channel {
! 30: u_int chan_num;
! 31: struct ksensor chan_sensor;
! 32: };
! 33:
! 34: struct pcfadc_softc {
! 35: struct device sc_dev;
! 36: i2c_tag_t sc_tag;
! 37: i2c_addr_t sc_addr;
! 38: u_char sc_xlate[256];
! 39: u_int sc_nchan;
! 40: struct pcfadc_channel sc_channels[PCF8591_CHANNELS];
! 41: struct ksensordev sc_sensordev;
! 42: };
! 43:
! 44: int pcfadc_match(struct device *, void *, void *);
! 45: void pcfadc_attach(struct device *, struct device *, void *);
! 46: void pcfadc_refresh(void *);
! 47:
! 48: struct cfattach pcfadc_ca = {
! 49: sizeof(struct pcfadc_softc), pcfadc_match, pcfadc_attach
! 50: };
! 51:
! 52: struct cfdriver pcfadc_cd = {
! 53: NULL, "pcfadc", DV_DULL
! 54: };
! 55:
! 56: int
! 57: pcfadc_match(struct device *parent, void *match, void *aux)
! 58: {
! 59: struct i2c_attach_args *ia = aux;
! 60:
! 61: if (strcmp(ia->ia_name, "i2cpcf,8591") != 0)
! 62: return (0);
! 63:
! 64: return (1);
! 65: }
! 66:
! 67: void
! 68: pcfadc_attach(struct device *parent, struct device *self, void *aux)
! 69: {
! 70: struct pcfadc_softc *sc = (struct pcfadc_softc *)self;
! 71: u_char chanuse[PCF8591_CHANNELS * 4], desc[PCF8591_CHANNELS * 32];
! 72: u_char *cp;
! 73: u_int8_t junk[PCF8591_CHANNELS + 1];
! 74: u_int32_t transinfo[PCF8591_CHANNELS * 4];
! 75: struct i2c_attach_args *ia = aux;
! 76: int dlen, clen, tlen, node = *(int *)ia->ia_cookie;
! 77: u_int i;
! 78:
! 79: if ((dlen = OF_getprop(node, "channels-description", desc,
! 80: sizeof(desc))) < 0) {
! 81: printf(": couldn't find \"channels-description\" property\n");
! 82: return;
! 83: }
! 84: if (dlen > sizeof(desc) || desc[dlen - 1] != '\0') {
! 85: printf(": bad \"channels-description\" property\n");
! 86: return;
! 87: }
! 88: if ((clen = OF_getprop(node, "channels-in-use", chanuse,
! 89: sizeof(chanuse))) < 0) {
! 90: printf(": couldn't find \"channels-in-use\" property\n");
! 91: return;
! 92: }
! 93: if ((clen % 4) != 0) {
! 94: printf(": invalid \"channels-in-use\" length %d\n", clen);
! 95: return;
! 96: }
! 97: sc->sc_nchan = clen / 4;
! 98: if (sc->sc_nchan > PCF8591_CHANNELS) {
! 99: printf(": invalid number of channels (%d)\n", sc->sc_nchan);
! 100: return;
! 101: }
! 102:
! 103: if ((tlen = OF_getprop(node, "tables", sc->sc_xlate,
! 104: sizeof(sc->sc_xlate))) < 0) {
! 105: printf(": couldn't find \"tables\" property\n");
! 106: return;
! 107: }
! 108: /* We only support complete, single width tables */
! 109: if (tlen != 256) {
! 110: printf(": invalid \"tables\" length %d\n", tlen);
! 111: return;
! 112: }
! 113:
! 114: if ((tlen = OF_getprop(node, "translation", transinfo,
! 115: sizeof(transinfo))) < 0) {
! 116: printf(": couldn't find \"translation\" property\n");
! 117: return;
! 118: }
! 119: if (tlen != (sc->sc_nchan * 4 * 4)) {
! 120: printf(": invalid \"translation\" length %d\n", tlen);
! 121: return;
! 122: }
! 123:
! 124: cp = desc;
! 125: for (i = 0; i < sc->sc_nchan; i++) {
! 126: struct pcfadc_channel *chp = &sc->sc_channels[i];
! 127:
! 128: chp->chan_sensor.type = SENSOR_TEMP;
! 129:
! 130: if (cp >= desc + dlen) {
! 131: printf(": invalid \"channels-description\"\n");
! 132: return;
! 133: }
! 134: strlcpy(chp->chan_sensor.desc, cp,
! 135: sizeof(chp->chan_sensor.desc));
! 136: cp += strlen(cp) + 1;
! 137:
! 138: /*
! 139: * We only support input temperature channels, with
! 140: * valid channel numbers, and basic (unscaled) translation
! 141: *
! 142: * XXX TODO: support voltage (type 2) channels and type 4
! 143: * (scaled) translation tables
! 144: */
! 145: if (chanuse[(i * 4)] > PCF8591_CHANNELS || /* channel # */
! 146: chanuse[(i * 4) + 1] != 0 || /* dir == input */
! 147: chanuse[(i * 4) + 2] != 1 || /* type == temp */
! 148: transinfo[(i * 4)] != 3 || /* xlate == table */
! 149: transinfo[(i * 4) + 2] != 0 || /* no xlate offset */
! 150: transinfo[(i * 4) + 3] != 0x100) { /* xlate tbl length */
! 151: printf(": unsupported sensor %d\n", i);
! 152: return;
! 153: }
! 154: chp->chan_num = chanuse[(i * 4)];
! 155: }
! 156:
! 157: sc->sc_tag = ia->ia_tag;
! 158: sc->sc_addr = ia->ia_addr;
! 159:
! 160: iic_acquire_bus(sc->sc_tag, 0);
! 161:
! 162: /* Try a read now, so we can fail if it doesn't work */
! 163: if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
! 164: NULL, 0, junk, sc->sc_nchan + 1, 0)) {
! 165: printf(": read failed\n");
! 166: iic_release_bus(sc->sc_tag, 0);
! 167: return;
! 168: }
! 169:
! 170: iic_release_bus(sc->sc_tag, 0);
! 171:
! 172: /* Initialize sensor data. */
! 173: strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
! 174: sizeof(sc->sc_sensordev.xname));
! 175:
! 176: for (i = 0; i < sc->sc_nchan; i++)
! 177: if (!(sc->sc_channels[i].chan_sensor.flags & SENSOR_FINVALID))
! 178: sensor_attach(&sc->sc_sensordev,
! 179: &sc->sc_channels[i].chan_sensor);
! 180:
! 181: if (sensor_task_register(sc, pcfadc_refresh, 5) == NULL) {
! 182: printf(": unable to register update task\n");
! 183: return;
! 184: }
! 185:
! 186: sensordev_install(&sc->sc_sensordev);
! 187:
! 188: printf("\n");
! 189: }
! 190:
! 191: void
! 192: pcfadc_refresh(void *arg)
! 193: {
! 194: struct pcfadc_softc *sc = arg;
! 195: u_int i;
! 196: u_int8_t data[PCF8591_CHANNELS + 1];
! 197:
! 198: iic_acquire_bus(sc->sc_tag, 0);
! 199: /* NB: first byte out is stale, so read num_channels + 1 */
! 200: if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
! 201: NULL, 0, data, PCF8591_CHANNELS + 1, 0)) {
! 202: iic_release_bus(sc->sc_tag, 0);
! 203: return;
! 204: }
! 205: iic_release_bus(sc->sc_tag, 0);
! 206:
! 207: /* XXX: so far this only supports temperature channels */
! 208: for (i = 0; i < sc->sc_nchan; i++) {
! 209: struct pcfadc_channel *chp = &sc->sc_channels[i];
! 210:
! 211: if ((chp->chan_sensor.flags & SENSOR_FINVALID) != 0)
! 212: continue;
! 213: chp->chan_sensor.value = 273150000 + 1000000 *
! 214: sc->sc_xlate[data[1 + chp->chan_num]];
! 215: }
! 216: }
! 217:
CVSweb
![[BACK]](/icons/back.gif){kind=icon}
Return to pcf8591_ofw.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / sys / arch / sparc64 / dev