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Annotation of sys/dev/i2c/lm78_i2c.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: lm78_i2c.c,v 1.1 2006/01/28 11:18:41 kettenis Exp $   */
                      2:
                      3: /*
                      4:  * Copyright (c) 2005 Mark Kettenis
                      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 <machine/bus.h>
                     25:
                     26: #include <dev/i2c/i2cvar.h>
                     27: #include <dev/ic/lm78var.h>
                     28:
                     29: struct lm_i2c_softc {
                     30:        struct lm_softc sc_lmsc;
                     31:        i2c_tag_t       sc_tag;
                     32:        i2c_addr_t      sc_addr;
                     33: };
                     34:
                     35: int lm_i2c_match(struct device *, void *, void *);
                     36: void lm_i2c_attach(struct device *, struct device *, void *);
                     37: int lm_i2c_detach(struct device *, int);
                     38: u_int8_t lm_i2c_readreg(struct lm_softc *, int);
                     39: void lm_i2c_writereg(struct lm_softc *, int, int);
                     40:
                     41: struct cfattach lm_i2c_ca = {
                     42:        sizeof(struct lm_i2c_softc), lm_i2c_match,
                     43:        lm_i2c_attach, lm_i2c_detach
                     44: };
                     45:
                     46: int
                     47: lm_i2c_match(struct device *parent, void *match, void *aux)
                     48: {
                     49:        struct i2c_attach_args *ia = aux;
                     50:
                     51:        if (strcmp(ia->ia_name, "as99127f") == 0 ||
                     52:            strcmp(ia->ia_name, "w83627hf") == 0 ||
                     53:            strcmp(ia->ia_name, "w83781d") == 0 ||
                     54:            strcmp(ia->ia_name, "w83782d") == 0 ||
                     55:            strcmp(ia->ia_name, "w83783s") == 0 ||
                     56:            strcmp(ia->ia_name, "w83791d") == 0 ||
                     57:            strcmp(ia->ia_name, "w83792d") == 0) {
                     58:                return (1);
                     59:        }
                     60:        /*
                     61:         * XXX This chip doesn't have any real sensors, but we match
                     62:         * it for now, just to knock out its satellites.
                     63:         */
                     64:        if (strcmp(ia->ia_name, "w83791sd") == 0) {
                     65:                return (1);
                     66:        }
                     67:        return (0);
                     68: }
                     69:
                     70: void
                     71: lm_i2c_attach(struct device *parent, struct device *self, void *aux)
                     72: {
                     73:        struct lm_i2c_softc *sc = (struct lm_i2c_softc *)self;
                     74:        struct i2c_attach_args *ia = aux;
                     75:        u_int8_t cmd, data;
                     76:
                     77:        sc->sc_tag = ia->ia_tag;
                     78:        sc->sc_addr = ia->ia_addr;
                     79:
                     80:        /* Bus-independent attachment. */
                     81:        sc->sc_lmsc.lm_writereg = lm_i2c_writereg;
                     82:        sc->sc_lmsc.lm_readreg = lm_i2c_readreg;
                     83:        lm_attach(&sc->sc_lmsc);
                     84:
                     85:        /* Remember we attached to iic(4). */
                     86:        sc->sc_lmsc.sbusaddr = ia->ia_addr;
                     87:
                     88:        iic_acquire_bus(sc->sc_tag, 0);
                     89:
                     90:        cmd = 0x4a;
                     91:        iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
                     92:            sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0);
                     93:
                     94:        iic_release_bus(sc->sc_tag, 0);
                     95:
                     96:        /* Make the bus scan ignore the satellites. */
                     97:        iic_ignore_addr(0x48 + (data & 0x7));
                     98:        iic_ignore_addr(0x48 + ((data >> 4) & 0x7));
                     99: }
                    100:
                    101: int
                    102: lm_i2c_detach(struct device *self, int flags)
                    103: {
                    104:        struct lm_i2c_softc *sc = (struct lm_i2c_softc *)self;
                    105:
                    106:        return lm_detach(&sc->sc_lmsc);
                    107: }
                    108:
                    109: u_int8_t
                    110: lm_i2c_readreg(struct lm_softc *lmsc, int reg)
                    111: {
                    112:        struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc;
                    113:        u_int8_t cmd, data;
                    114:
                    115:        iic_acquire_bus(sc->sc_tag, 0);
                    116:
                    117:        cmd = reg;
                    118:        iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
                    119:             sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0);
                    120:
                    121:        iic_release_bus(sc->sc_tag, 0);
                    122:
                    123:        return data;
                    124: }
                    125:
                    126: void
                    127: lm_i2c_writereg(struct lm_softc *lmsc, int reg, int val)
                    128: {
                    129:        struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc;
                    130:        u_int8_t cmd, data;
                    131:
                    132:        iic_acquire_bus(sc->sc_tag, 0);
                    133:
                    134:        cmd = reg;
                    135:        data = val;
                    136:        iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
                    137:            sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0);
                    138:
                    139:        iic_release_bus(sc->sc_tag, 0);
                    140: }