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Annotation of sys/dev/i2c/lm78_i2c.c, Revision 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: }