pcf8591_envctrl.c revision 1.9
1 /* $NetBSD: pcf8591_envctrl.c,v 1.9 2018/06/26 06:03:57 thorpej Exp $ */ 2 /* $OpenBSD: pcf8591_envctrl.c,v 1.6 2007/10/25 21:17:20 kettenis Exp $ */ 3 4 /* 5 * Copyright (c) 2006 Damien Miller <djm (at) openbsd.org> 6 * Copyright (c) 2007 Mark Kettenis <kettenis (at) openbsd.org> 7 * 8 * Permission to use, copy, modify, and distribute this software for any 9 * purpose with or without fee is hereby granted, provided that the above 10 * copyright notice and this permission notice appear in all copies. 11 * 12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19 */ 20 21 #include <sys/cdefs.h> 22 __KERNEL_RCSID(0, "$NetBSD: pcf8591_envctrl.c,v 1.9 2018/06/26 06:03:57 thorpej Exp $"); 23 24 #include <sys/param.h> 25 #include <sys/systm.h> 26 #include <sys/device.h> 27 28 #include <dev/sysmon/sysmonvar.h> 29 30 #include <dev/ofw/openfirm.h> 31 #include <dev/i2c/i2cvar.h> 32 33 #define PCF8591_CHANNELS 4 34 35 #define PCF8591_CTRL_CH0 0x00 36 #define PCF8591_CTRL_CH1 0x01 37 #define PCF8591_CTRL_CH2 0x02 38 #define PCF8591_CTRL_CH3 0x03 39 #define PCF8591_CTRL_AUTOINC 0x04 40 #define PCF8591_CTRL_OSCILLATOR 0x40 41 42 struct ecadc_channel { 43 u_int chan_num; 44 envsys_data_t chan_sensor; 45 u_char *chan_xlate; 46 int64_t chan_factor; 47 int64_t chan_min; 48 int64_t chan_warn; 49 int64_t chan_crit; 50 }; 51 52 struct ecadc_softc { 53 device_t sc_dev; 54 i2c_tag_t sc_tag; 55 i2c_addr_t sc_addr; 56 u_char sc_ps_xlate[256]; 57 u_char sc_cpu_xlate[256]; 58 u_int sc_nchan; 59 struct ecadc_channel sc_channels[PCF8591_CHANNELS]; 60 struct sysmon_envsys *sc_sme; 61 }; 62 63 static int ecadc_match(device_t, cfdata_t, void *); 64 static void ecadc_attach(device_t, device_t, void *); 65 static void ecadc_refresh(struct sysmon_envsys *, envsys_data_t *); 66 static void ecadc_get_limits(struct sysmon_envsys *, envsys_data_t *, 67 sysmon_envsys_lim_t *, uint32_t *); 68 69 CFATTACH_DECL_NEW(ecadc, sizeof(struct ecadc_softc), 70 ecadc_match, ecadc_attach, NULL, NULL); 71 72 static const struct device_compatible_entry compat_data[] = { 73 { "ecadc", 0 }, 74 { NULL, 0 } 75 }; 76 77 static int 78 ecadc_match(device_t parent, cfdata_t cf, void *aux) 79 { 80 struct i2c_attach_args *ia = aux; 81 int match_result; 82 83 if (iic_use_direct_match(ia, cf, compat_data, &match_result)) 84 return match_result; 85 86 /* This driver is direct-config only. */ 87 88 return 0; 89 } 90 91 static void 92 ecadc_attach(device_t parent, device_t self, void *aux) 93 { 94 struct i2c_attach_args *ia = aux; 95 struct ecadc_softc *sc = device_private(self); 96 u_char term[256]; 97 u_char *cp, *desc; 98 int64_t minv, warnv, crit, num, den; 99 u_int8_t junk[PCF8591_CHANNELS + 1]; 100 envsys_data_t *sensor; 101 int len, error, addr, chan, node = (int)ia->ia_cookie; 102 u_int i; 103 104 sc->sc_dev = self; 105 if ((len = OF_getprop(node, "thermisters", term, 106 sizeof(term))) < 0) { 107 aprint_error(": couldn't find \"thermisters\" property\n"); 108 return; 109 } 110 111 if (OF_getprop(node, "cpu-temp-factors", &sc->sc_cpu_xlate[2], 112 sizeof(sc->sc_cpu_xlate) - 2) < 0) { 113 aprint_error(": couldn't find \"cpu-temp-factors\" property\n"); 114 return; 115 } 116 sc->sc_cpu_xlate[0] = sc->sc_cpu_xlate[1] = sc->sc_cpu_xlate[2]; 117 118 /* Only the Sun Enterprise 450 has these. */ 119 OF_getprop(node, "ps-temp-factors", &sc->sc_ps_xlate[2], 120 sizeof(sc->sc_ps_xlate) - 2); 121 sc->sc_ps_xlate[0] = sc->sc_ps_xlate[1] = sc->sc_ps_xlate[2]; 122 123 cp = term; 124 while (cp < term + len) { 125 addr = cp[0] << 24 | cp[1] << 16 | cp[2] << 8 | cp[3]; cp += 4; 126 chan = cp[0] << 24 | cp[1] << 16 | cp[2] << 8 | cp[3]; cp += 4; 127 minv = cp[0] << 24 | cp[1] << 16 | cp[2] << 8 | cp[3]; cp += 4; 128 warnv = cp[0] << 24 | cp[1] << 16 | cp[2] << 8 | cp[3]; cp += 4; 129 crit = cp[0] << 24 | cp[1] << 16 | cp[2] << 8 | cp[3]; cp += 4; 130 num = cp[0] << 24 | cp[1] << 16 | cp[2] << 8 | cp[3]; cp += 4; 131 den = cp[0] << 24 | cp[1] << 16 | cp[2] << 8 | cp[3]; cp += 4; 132 desc = cp; 133 while (cp < term + len && *cp++); 134 135 if (addr != (ia->ia_addr << 1)) 136 continue; 137 138 if (num == 0 || den == 0) 139 num = den = 1; 140 141 sc->sc_channels[sc->sc_nchan].chan_num = chan; 142 143 sensor = &sc->sc_channels[sc->sc_nchan].chan_sensor; 144 sensor->units = ENVSYS_STEMP; 145 sensor->flags |= ENVSYS_FMONLIMITS; 146 sensor->state = ENVSYS_SINVALID; 147 strlcpy(sensor->desc, desc, sizeof(sensor->desc)); 148 149 if (strncmp(desc, "CPU", 3) == 0) 150 sc->sc_channels[sc->sc_nchan].chan_xlate = 151 sc->sc_cpu_xlate; 152 else if (strncmp(desc, "PS", 2) == 0) 153 sc->sc_channels[sc->sc_nchan].chan_xlate = 154 sc->sc_ps_xlate; 155 else 156 sc->sc_channels[sc->sc_nchan].chan_factor = 157 (1000000 * num) / den; 158 sc->sc_channels[sc->sc_nchan].chan_min = 159 273150000 + 1000000 * minv; 160 sc->sc_channels[sc->sc_nchan].chan_warn = 161 273150000 + 1000000 * warnv; 162 sc->sc_channels[sc->sc_nchan].chan_crit = 163 273150000 + 1000000 * crit; 164 sc->sc_nchan++; 165 } 166 167 sc->sc_tag = ia->ia_tag; 168 sc->sc_addr = ia->ia_addr; 169 170 iic_acquire_bus(sc->sc_tag, 0); 171 172 /* Try a read now, so we can fail if it doesn't work */ 173 if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr, 174 NULL, 0, junk, sc->sc_nchan + 1, 0)) { 175 aprint_error(": read failed\n"); 176 iic_release_bus(sc->sc_tag, 0); 177 return; 178 } 179 180 iic_release_bus(sc->sc_tag, 0); 181 182 /* Hook us into the sysmon_envsys subsystem */ 183 sc->sc_sme = sysmon_envsys_create(); 184 sc->sc_sme->sme_name = device_xname(self); 185 sc->sc_sme->sme_cookie = sc; 186 sc->sc_sme->sme_refresh = ecadc_refresh; 187 sc->sc_sme->sme_get_limits = ecadc_get_limits; 188 189 /* Initialize sensor data. */ 190 for (i = 0; i < sc->sc_nchan; i++) 191 sysmon_envsys_sensor_attach(sc->sc_sme, 192 &sc->sc_channels[i].chan_sensor); 193 194 error = sysmon_envsys_register(sc->sc_sme); 195 if (error) { 196 aprint_error_dev(self, "error %d registering with sysmon\n", 197 error); 198 sysmon_envsys_destroy(sc->sc_sme); 199 return; 200 } 201 202 aprint_naive(": Temp Sensors\n"); 203 aprint_normal(": %s Temp Sensors\n", ia->ia_name); 204 } 205 206 static void 207 ecadc_refresh(struct sysmon_envsys *sme, envsys_data_t *sensor) 208 { 209 struct ecadc_softc *sc = sme->sme_cookie; 210 u_int i; 211 u_int8_t data[PCF8591_CHANNELS + 1]; 212 u_int8_t ctrl = PCF8591_CTRL_CH0 | PCF8591_CTRL_AUTOINC | 213 PCF8591_CTRL_OSCILLATOR; 214 215 iic_acquire_bus(sc->sc_tag, 0); 216 if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_addr, 217 &ctrl, 1, NULL, 0, 0)) { 218 iic_release_bus(sc->sc_tag, 0); 219 return; 220 } 221 /* NB: first byte out is stale, so read num_channels + 1 */ 222 if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr, 223 NULL, 0, data, PCF8591_CHANNELS + 1, 0)) { 224 iic_release_bus(sc->sc_tag, 0); 225 return; 226 } 227 iic_release_bus(sc->sc_tag, 0); 228 229 /* We only support temperature channels. */ 230 for (i = 0; i < sc->sc_nchan; i++) { 231 struct ecadc_channel *chp = &sc->sc_channels[i]; 232 233 if (chp->chan_xlate) 234 chp->chan_sensor.value_cur = 273150000 + 1000000 * 235 chp->chan_xlate[data[1 + chp->chan_num]]; 236 else 237 chp->chan_sensor.value_cur = 273150000 + 238 chp->chan_factor * data[1 + chp->chan_num]; 239 240 chp->chan_sensor.state = ENVSYS_SVALID; 241 chp->chan_sensor.flags &= ~ENVSYS_FNEED_REFRESH; 242 chp->chan_sensor.flags |= ENVSYS_FMONLIMITS; 243 } 244 } 245 246 static void 247 ecadc_get_limits(struct sysmon_envsys *sme, envsys_data_t *edata, 248 sysmon_envsys_lim_t *limits, uint32_t *props) 249 { 250 struct ecadc_softc *sc = sme->sme_cookie; 251 int i; 252 253 for (i = 0; i < sc->sc_nchan; i++) { 254 if (edata != &sc->sc_channels[i].chan_sensor) 255 continue; 256 *props |= PROP_WARNMIN|PROP_WARNMAX|PROP_CRITMAX; 257 limits->sel_warnmin = sc->sc_channels[i].chan_min; 258 limits->sel_warnmax = sc->sc_channels[i].chan_warn; 259 limits->sel_critmax = sc->sc_channels[i].chan_crit; 260 return; 261 } 262 } 263
Indexes created Tue Sep 30 11:09:46 GMT 2025