| File: | dev/isa/lm78_isa.c |
| Warning: | line 142, column 7 Although the value stored to 'vendid' is used in the enclosing expression, the value is never actually read from 'vendid' |
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| 1 | /* $OpenBSD: lm78_isa.c,v 1.12 2022/04/06 18:59:28 naddy Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2005, 2006 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 | #include <machine/bus.h> |
| 24 | |
| 25 | #include <dev/isa/isavar.h> |
| 26 | |
| 27 | #include <dev/ic/lm78var.h> |
| 28 | |
| 29 | /* ISA registers */ |
| 30 | #define LMC_ADDR0x05 0x05 |
| 31 | #define LMC_DATA0x06 0x06 |
| 32 | |
| 33 | extern struct cfdriver lm_cd; |
| 34 | |
| 35 | #if defined(LMDEBUG) |
| 36 | #define DPRINTF(x) do { printf x; } while (0) |
| 37 | #else |
| 38 | #define DPRINTF(x) |
| 39 | #endif |
| 40 | |
| 41 | struct lm_isa_softc { |
| 42 | struct lm_softc sc_lmsc; |
| 43 | |
| 44 | bus_space_tag_t sc_iot; |
| 45 | bus_space_handle_t sc_ioh; |
| 46 | }; |
| 47 | |
| 48 | int lm_isa_match(struct device *, void *, void *); |
| 49 | int lm_wbsio_match(struct device *, void *, void *); |
| 50 | void lm_isa_attach(struct device *, struct device *, void *); |
| 51 | u_int8_t lm_isa_readreg(struct lm_softc *, int); |
| 52 | void lm_isa_writereg(struct lm_softc *, int, int); |
| 53 | void lm_isa_remove_alias(struct lm_softc *, const char *); |
| 54 | |
| 55 | const struct cfattach lm_isa_ca = { |
| 56 | sizeof(struct lm_isa_softc), |
| 57 | lm_isa_match, |
| 58 | lm_isa_attach |
| 59 | }; |
| 60 | |
| 61 | const struct cfattach lm_wbsio_ca = { |
| 62 | sizeof(struct lm_isa_softc), |
| 63 | lm_wbsio_match, |
| 64 | lm_isa_attach |
| 65 | }; |
| 66 | |
| 67 | int |
| 68 | lm_wbsio_match(struct device *parent, void *match, void *aux) |
| 69 | { |
| 70 | bus_space_tag_t iot; |
| 71 | bus_addr_t iobase; |
| 72 | bus_space_handle_t ioh; |
| 73 | struct isa_attach_args *ia = aux; |
| 74 | int banksel, vendid; |
| 75 | |
| 76 | iot = ia->ia_iot; |
| 77 | iobase = ia->ipa_io[0].base; |
| 78 | |
| 79 | if (bus_space_map(iot, iobase, 8, 0, &ioh)) { |
| 80 | DPRINTF(("%s: can't map i/o space\n", __func__)); |
| 81 | return (0); |
| 82 | } |
| 83 | |
| 84 | /* Probe for Winbond chips. */ |
| 85 | bus_space_write_1(iot, ioh, LMC_ADDR, WB_BANKSEL)((iot)->write_1((ioh), (0x05), (0x4e))); |
| 86 | banksel = bus_space_read_1(iot, ioh, LMC_DATA)((iot)->read_1((ioh), (0x06))); |
| 87 | bus_space_write_1(iot, ioh, LMC_ADDR, WB_BANKSEL)((iot)->write_1((ioh), (0x05), (0x4e))); |
| 88 | bus_space_write_1(iot, ioh, LMC_DATA, WB_BANKSEL_HBAC)((iot)->write_1((ioh), (0x06), (0x80))); |
| 89 | bus_space_write_1(iot, ioh, LMC_ADDR, WB_VENDID)((iot)->write_1((ioh), (0x05), (0x4f))); |
| 90 | vendid = bus_space_read_1(iot, ioh, LMC_DATA)((iot)->read_1((ioh), (0x06))) << 8; |
| 91 | bus_space_write_1(iot, ioh, LMC_ADDR, WB_BANKSEL)((iot)->write_1((ioh), (0x05), (0x4e))); |
| 92 | bus_space_write_1(iot, ioh, LMC_DATA, 0)((iot)->write_1((ioh), (0x06), (0))); |
| 93 | bus_space_write_1(iot, ioh, LMC_ADDR, WB_VENDID)((iot)->write_1((ioh), (0x05), (0x4f))); |
| 94 | vendid |= bus_space_read_1(iot, ioh, LMC_DATA)((iot)->read_1((ioh), (0x06))); |
| 95 | bus_space_write_1(iot, ioh, LMC_ADDR, WB_BANKSEL)((iot)->write_1((ioh), (0x05), (0x4e))); |
| 96 | bus_space_write_1(iot, ioh, LMC_DATA, banksel)((iot)->write_1((ioh), (0x06), (banksel))); |
| 97 | |
| 98 | bus_space_unmap(iot, ioh, 8); |
| 99 | |
| 100 | if (vendid != WB_VENDID_WINBOND0x5ca3) |
| 101 | return (0); |
| 102 | |
| 103 | ia->ipa_nio = 1; |
| 104 | ia->ipa_io[0].length = 8; |
| 105 | |
| 106 | ia->ipa_nmem = 0; |
| 107 | ia->ipa_nirq = 0; |
| 108 | ia->ipa_ndrq = 0; |
| 109 | |
| 110 | return (1); |
| 111 | |
| 112 | } |
| 113 | |
| 114 | int |
| 115 | lm_isa_match(struct device *parent, void *match, void *aux) |
| 116 | { |
| 117 | bus_space_tag_t iot; |
| 118 | bus_addr_t iobase; |
| 119 | bus_space_handle_t ioh; |
| 120 | struct isa_attach_args *ia = aux; |
| 121 | int banksel, vendid, chipid, addr; |
| 122 | |
| 123 | iot = ia->ia_iot; |
| 124 | iobase = ia->ipa_io[0].base; |
| 125 | |
| 126 | if (bus_space_map(iot, iobase, 8, 0, &ioh)) { |
| 127 | DPRINTF(("%s: can't map i/o space\n", __func__)); |
| 128 | return (0); |
| 129 | } |
| 130 | |
| 131 | /* Probe for Winbond chips. */ |
| 132 | bus_space_write_1(iot, ioh, LMC_ADDR, WB_BANKSEL)((iot)->write_1((ioh), (0x05), (0x4e))); |
| 133 | banksel = bus_space_read_1(iot, ioh, LMC_DATA)((iot)->read_1((ioh), (0x06))); |
| 134 | bus_space_write_1(iot, ioh, LMC_ADDR, WB_VENDID)((iot)->write_1((ioh), (0x05), (0x4f))); |
| 135 | vendid = bus_space_read_1(iot, ioh, LMC_DATA)((iot)->read_1((ioh), (0x06))); |
| 136 | if (((banksel & 0x80) && vendid == (WB_VENDID_WINBOND0x5ca3 >> 8)) || |
| 137 | (!(banksel & 0x80) && vendid == (WB_VENDID_WINBOND0x5ca3 & 0xff))) |
| 138 | goto found; |
| 139 | |
| 140 | /* Probe for ITE chips (and don't attach if we find one). */ |
| 141 | bus_space_write_1(iot, ioh, LMC_ADDR, 0x58)((iot)->write_1((ioh), (0x05), (0x58))); |
| 142 | if ((vendid = bus_space_read_1(iot, ioh, LMC_DATA)((iot)->read_1((ioh), (0x06)))) == 0x90) |
Although the value stored to 'vendid' is used in the enclosing expression, the value is never actually read from 'vendid' | |
| 143 | goto notfound; |
| 144 | |
| 145 | /* |
| 146 | * Probe for National Semiconductor LM78/79/81. |
| 147 | * |
| 148 | * XXX This assumes the address has not been changed from the |
| 149 | * power up default. This is probably a reasonable |
| 150 | * assumption, and if it isn't true, we should be able to |
| 151 | * access the chip using the serial bus. |
| 152 | */ |
| 153 | bus_space_write_1(iot, ioh, LMC_ADDR, LM_SBUSADDR)((iot)->write_1((ioh), (0x05), (0x48))); |
| 154 | addr = bus_space_read_1(iot, ioh, LMC_DATA)((iot)->read_1((ioh), (0x06))); |
| 155 | if ((addr & 0xfc) == 0x2c) { |
| 156 | bus_space_write_1(iot, ioh, LMC_ADDR, LM_CHIPID)((iot)->write_1((ioh), (0x05), (0x49))); |
| 157 | chipid = bus_space_read_1(iot, ioh, LMC_DATA)((iot)->read_1((ioh), (0x06))); |
| 158 | |
| 159 | switch (chipid & LM_CHIPID_MASK0xfe) { |
| 160 | case LM_CHIPID_LM780x00: |
| 161 | case LM_CHIPID_LM78J0x40: |
| 162 | case LM_CHIPID_LM790xC0: |
| 163 | case LM_CHIPID_LM810x80: |
| 164 | goto found; |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | notfound: |
| 169 | bus_space_unmap(iot, ioh, 8); |
| 170 | |
| 171 | return (0); |
| 172 | |
| 173 | found: |
| 174 | bus_space_unmap(iot, ioh, 8); |
| 175 | |
| 176 | ia->ipa_nio = 1; |
| 177 | ia->ipa_io[0].length = 8; |
| 178 | |
| 179 | ia->ipa_nmem = 0; |
| 180 | ia->ipa_nirq = 0; |
| 181 | ia->ipa_ndrq = 0; |
| 182 | |
| 183 | return (1); |
| 184 | } |
| 185 | |
| 186 | void |
| 187 | lm_isa_attach(struct device *parent, struct device *self, void *aux) |
| 188 | { |
| 189 | struct lm_isa_softc *sc = (struct lm_isa_softc *)self; |
| 190 | struct isa_attach_args *ia = aux; |
| 191 | struct lm_softc *lmsc; |
| 192 | bus_addr_t iobase; |
| 193 | int i; |
| 194 | u_int8_t sbusaddr; |
| 195 | |
| 196 | sc->sc_iot = ia->ia_iot; |
| 197 | iobase = ia->ipa_io[0].base; |
| 198 | |
| 199 | if (bus_space_map(sc->sc_iot, iobase, 8, 0, &sc->sc_ioh)) { |
| 200 | printf(": can't map i/o space\n"); |
| 201 | return; |
| 202 | } |
| 203 | |
| 204 | /* Bus-independent attachment */ |
| 205 | sc->sc_lmsc.lm_writereg = lm_isa_writereg; |
| 206 | sc->sc_lmsc.lm_readreg = lm_isa_readreg; |
| 207 | |
| 208 | /* pass through wbsio(4) devid */ |
| 209 | if (ia->ia_aux) |
| 210 | sc->sc_lmsc.sioid = (u_int8_t)(u_long)ia->ia_aux; |
| 211 | |
| 212 | lm_attach(&sc->sc_lmsc); |
| 213 | |
| 214 | /* |
| 215 | * Most devices supported by this driver can attach to iic(4) |
| 216 | * as well. However, we prefer to attach them to isa(4) since |
| 217 | * that causes less overhead and is more reliable. We look |
| 218 | * through all previously attached devices, and if we find an |
| 219 | * identical chip at the same serial bus address, we stop |
| 220 | * updating its sensors and mark them as invalid. |
| 221 | */ |
| 222 | |
| 223 | sbusaddr = lm_isa_readreg(&sc->sc_lmsc, LM_SBUSADDR0x48); |
| 224 | if (sbusaddr == 0) |
| 225 | return; |
| 226 | |
| 227 | for (i = 0; i < lm_cd.cd_ndevs; i++) { |
| 228 | lmsc = lm_cd.cd_devs[i]; |
| 229 | if (lmsc == &sc->sc_lmsc) |
| 230 | continue; |
| 231 | if (lmsc && lmsc->sbusaddr == sbusaddr && |
| 232 | lmsc->chipid == sc->sc_lmsc.chipid) { |
| 233 | lm_isa_remove_alias(lmsc, sc->sc_lmsc.sc_dev.dv_xname); |
| 234 | break; |
| 235 | } |
| 236 | } |
| 237 | } |
| 238 | |
| 239 | /* Remove sensors of the i2c alias, since we prefer to use the isa access */ |
| 240 | void |
| 241 | lm_isa_remove_alias(struct lm_softc *sc, const char *isa) |
| 242 | { |
| 243 | int i; |
| 244 | |
| 245 | printf("%s: disabling sensors due to alias with %s\n", |
| 246 | sc->sc_dev.dv_xname, isa); |
| 247 | sensordev_deinstall(&sc->sensordev); |
| 248 | for (i = 0; i < sc->numsensors; i++) |
| 249 | sensor_detach(&sc->sensordev, &sc->sensors[i]); |
| 250 | if (sc->sensortask != NULL((void *)0)) |
| 251 | sensor_task_unregister(sc->sensortask); |
| 252 | sc->sensortask = NULL((void *)0); |
| 253 | } |
| 254 | |
| 255 | u_int8_t |
| 256 | lm_isa_readreg(struct lm_softc *lmsc, int reg) |
| 257 | { |
| 258 | struct lm_isa_softc *sc = (struct lm_isa_softc *)lmsc; |
| 259 | |
| 260 | bus_space_write_1(sc->sc_iot, sc->sc_ioh, LMC_ADDR, reg)((sc->sc_iot)->write_1((sc->sc_ioh), (0x05), (reg))); |
| 261 | return (bus_space_read_1(sc->sc_iot, sc->sc_ioh, LMC_DATA)((sc->sc_iot)->read_1((sc->sc_ioh), (0x06)))); |
| 262 | } |
| 263 | |
| 264 | void |
| 265 | lm_isa_writereg(struct lm_softc *lmsc, int reg, int val) |
| 266 | { |
| 267 | struct lm_isa_softc *sc = (struct lm_isa_softc *)lmsc; |
| 268 | |
| 269 | bus_space_write_1(sc->sc_iot, sc->sc_ioh, LMC_ADDR, reg)((sc->sc_iot)->write_1((sc->sc_ioh), (0x05), (reg))); |
| 270 | bus_space_write_1(sc->sc_iot, sc->sc_ioh, LMC_DATA, val)((sc->sc_iot)->write_1((sc->sc_ioh), (0x06), (val))); |
| 271 | } |