1 /* $OpenBSD: lm78_i2c.c,v 1.4 2015/03/14 03:38:47 jsg 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 <dev/i2c/i2cvar.h> 25 #include <dev/ic/lm78var.h> 26 27 struct lm_i2c_softc { 28 struct lm_softc sc_lmsc; 29 i2c_tag_t sc_tag; 30 i2c_addr_t sc_addr; 31 }; 32 33 int lm_i2c_match(struct device *, void *, void *); 34 void lm_i2c_attach(struct device *, struct device *, void *); 35 u_int8_t lm_i2c_readreg(struct lm_softc *, int); 36 void lm_i2c_writereg(struct lm_softc *, int, int); 37 38 struct cfattach lm_i2c_ca = { 39 sizeof(struct lm_i2c_softc), lm_i2c_match, lm_i2c_attach 40 }; 41 42 int 43 lm_i2c_match(struct device *parent, void *match, void *aux) 44 { 45 struct i2c_attach_args *ia = aux; 46 47 if (strcmp(ia->ia_name, "as99127f") == 0 || 48 strcmp(ia->ia_name, "w83627dhg") == 0 || 49 strcmp(ia->ia_name, "w83627hf") == 0 || 50 strcmp(ia->ia_name, "w83781d") == 0 || 51 strcmp(ia->ia_name, "w83782d") == 0 || 52 strcmp(ia->ia_name, "w83783s") == 0 || 53 strcmp(ia->ia_name, "w83791d") == 0 || 54 strcmp(ia->ia_name, "w83792d") == 0) { 55 return (1); 56 } 57 /* 58 * XXX This chip doesn't have any real sensors, but we match 59 * it for now, just to knock out its satellites. 60 */ 61 if (strcmp(ia->ia_name, "w83791sd") == 0) { 62 return (1); 63 } 64 return (0); 65 } 66 67 void 68 lm_i2c_attach(struct device *parent, struct device *self, void *aux) 69 { 70 struct lm_i2c_softc *sc = (struct lm_i2c_softc *)self; 71 struct i2c_attach_args *ia = aux; 72 u_int8_t cmd, data; 73 74 sc->sc_tag = ia->ia_tag; 75 sc->sc_addr = ia->ia_addr; 76 77 /* Bus-independent attachment. */ 78 sc->sc_lmsc.lm_writereg = lm_i2c_writereg; 79 sc->sc_lmsc.lm_readreg = lm_i2c_readreg; 80 lm_attach(&sc->sc_lmsc); 81 82 /* Remember we attached to iic(4). */ 83 sc->sc_lmsc.sbusaddr = ia->ia_addr; 84 85 iic_acquire_bus(sc->sc_tag, 0); 86 87 cmd = 0x4a; 88 iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, 89 sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0); 90 91 iic_release_bus(sc->sc_tag, 0); 92 93 /* Make the bus scan ignore the satellites. */ 94 iic_ignore_addr(0x48 + (data & 0x7)); 95 iic_ignore_addr(0x48 + ((data >> 4) & 0x7)); 96 } 97 98 u_int8_t 99 lm_i2c_readreg(struct lm_softc *lmsc, int reg) 100 { 101 struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc; 102 u_int8_t cmd, data; 103 104 iic_acquire_bus(sc->sc_tag, 0); 105 106 cmd = reg; 107 iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, 108 sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0); 109 110 iic_release_bus(sc->sc_tag, 0); 111 112 return data; 113 } 114 115 void 116 lm_i2c_writereg(struct lm_softc *lmsc, int reg, int val) 117 { 118 struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc; 119 u_int8_t cmd, data; 120 121 iic_acquire_bus(sc->sc_tag, 0); 122 123 cmd = reg; 124 data = val; 125 iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, 126 sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0); 127 128 iic_release_bus(sc->sc_tag, 0); 129 } 130