1 /* $OpenBSD: lm78_i2c.c,v 1.3 2011/07/26 18:43:36 deraadt 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 u_int8_t lm_i2c_readreg(struct lm_softc *, int); 38 void lm_i2c_writereg(struct lm_softc *, int, int); 39 40 struct cfattach lm_i2c_ca = { 41 sizeof(struct lm_i2c_softc), lm_i2c_match, lm_i2c_attach 42 }; 43 44 int 45 lm_i2c_match(struct device *parent, void *match, void *aux) 46 { 47 struct i2c_attach_args *ia = aux; 48 49 if (strcmp(ia->ia_name, "as99127f") == 0 || 50 strcmp(ia->ia_name, "w83627dhg") == 0 || 51 strcmp(ia->ia_name, "w83627hf") == 0 || 52 strcmp(ia->ia_name, "w83781d") == 0 || 53 strcmp(ia->ia_name, "w83782d") == 0 || 54 strcmp(ia->ia_name, "w83783s") == 0 || 55 strcmp(ia->ia_name, "w83791d") == 0 || 56 strcmp(ia->ia_name, "w83792d") == 0) { 57 return (1); 58 } 59 /* 60 * XXX This chip doesn't have any real sensors, but we match 61 * it for now, just to knock out its satellites. 62 */ 63 if (strcmp(ia->ia_name, "w83791sd") == 0) { 64 return (1); 65 } 66 return (0); 67 } 68 69 void 70 lm_i2c_attach(struct device *parent, struct device *self, void *aux) 71 { 72 struct lm_i2c_softc *sc = (struct lm_i2c_softc *)self; 73 struct i2c_attach_args *ia = aux; 74 u_int8_t cmd, data; 75 76 sc->sc_tag = ia->ia_tag; 77 sc->sc_addr = ia->ia_addr; 78 79 /* Bus-independent attachment. */ 80 sc->sc_lmsc.lm_writereg = lm_i2c_writereg; 81 sc->sc_lmsc.lm_readreg = lm_i2c_readreg; 82 lm_attach(&sc->sc_lmsc); 83 84 /* Remember we attached to iic(4). */ 85 sc->sc_lmsc.sbusaddr = ia->ia_addr; 86 87 iic_acquire_bus(sc->sc_tag, 0); 88 89 cmd = 0x4a; 90 iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, 91 sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0); 92 93 iic_release_bus(sc->sc_tag, 0); 94 95 /* Make the bus scan ignore the satellites. */ 96 iic_ignore_addr(0x48 + (data & 0x7)); 97 iic_ignore_addr(0x48 + ((data >> 4) & 0x7)); 98 } 99 100 u_int8_t 101 lm_i2c_readreg(struct lm_softc *lmsc, int reg) 102 { 103 struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc; 104 u_int8_t cmd, data; 105 106 iic_acquire_bus(sc->sc_tag, 0); 107 108 cmd = reg; 109 iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, 110 sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0); 111 112 iic_release_bus(sc->sc_tag, 0); 113 114 return data; 115 } 116 117 void 118 lm_i2c_writereg(struct lm_softc *lmsc, int reg, int val) 119 { 120 struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc; 121 u_int8_t cmd, data; 122 123 iic_acquire_bus(sc->sc_tag, 0); 124 125 cmd = reg; 126 data = val; 127 iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, 128 sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0); 129 130 iic_release_bus(sc->sc_tag, 0); 131 } 132