1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2010 Andreas Tobler 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 20 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 21 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 22 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 #include <sys/param.h> 30 #include <sys/bus.h> 31 #include <sys/systm.h> 32 #include <sys/module.h> 33 #include <sys/callout.h> 34 #include <sys/conf.h> 35 #include <sys/cpu.h> 36 #include <sys/ctype.h> 37 #include <sys/kernel.h> 38 #include <sys/reboot.h> 39 #include <sys/rman.h> 40 #include <sys/sysctl.h> 41 #include <sys/limits.h> 42 43 #include <machine/bus.h> 44 #include <machine/md_var.h> 45 46 #include <dev/iicbus/iicbus.h> 47 #include <dev/iicbus/iiconf.h> 48 49 #include <dev/ofw/openfirm.h> 50 #include <dev/ofw/ofw_bus.h> 51 #include <powerpc/powermac/powermac_thermal.h> 52 53 /* Drivebay sensor: LM75/DS1775. */ 54 #define DS1775_TEMP 0x0 55 56 /* Regular bus attachment functions */ 57 static int ds1775_probe(device_t); 58 static int ds1775_attach(device_t); 59 60 struct ds1775_softc { 61 struct pmac_therm sc_sensor; 62 device_t sc_dev; 63 struct intr_config_hook enum_hook; 64 uint32_t sc_addr; 65 }; 66 67 /* Utility functions */ 68 static int ds1775_sensor_read(struct ds1775_softc *sc); 69 static int ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS); 70 static void ds1775_start(void *xdev); 71 static int ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg, 72 uint16_t *data); 73 74 static device_method_t ds1775_methods[] = { 75 /* Device interface */ 76 DEVMETHOD(device_probe, ds1775_probe), 77 DEVMETHOD(device_attach, ds1775_attach), 78 { 0, 0 }, 79 }; 80 81 static driver_t ds1775_driver = { 82 "ds1775", 83 ds1775_methods, 84 sizeof(struct ds1775_softc) 85 }; 86 87 DRIVER_MODULE(ds1775, iicbus, ds1775_driver, 0, 0); 88 89 static int 90 ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg, uint16_t *data) 91 { 92 uint8_t buf[4]; 93 int err, try = 0; 94 95 struct iic_msg msg[2] = { 96 { addr, IIC_M_WR | IIC_M_NOSTOP, 1, ® }, 97 { addr, IIC_M_RD, 2, buf }, 98 }; 99 100 for (;;) 101 { 102 err = iicbus_transfer(dev, msg, nitems(msg)); 103 if (err != 0) 104 goto retry; 105 106 *data = *((uint16_t*)buf); 107 return (0); 108 retry: 109 if (++try > 5) { 110 device_printf(dev, "iicbus read failed\n"); 111 return (-1); 112 } 113 pause("ds1775_read_2", hz); 114 } 115 } 116 117 static int 118 ds1775_probe(device_t dev) 119 { 120 const char *name, *compatible; 121 struct ds1775_softc *sc; 122 123 name = ofw_bus_get_name(dev); 124 compatible = ofw_bus_get_compat(dev); 125 126 if (!name) 127 return (ENXIO); 128 129 if (strcmp(name, "temp-monitor") != 0 || 130 (strcmp(compatible, "ds1775") != 0 && 131 strcmp(compatible, "lm75") != 0)) 132 return (ENXIO); 133 134 sc = device_get_softc(dev); 135 sc->sc_dev = dev; 136 sc->sc_addr = iicbus_get_addr(dev); 137 138 device_set_desc(dev, "Temp-Monitor DS1775"); 139 140 return (0); 141 } 142 143 static int 144 ds1775_attach(device_t dev) 145 { 146 struct ds1775_softc *sc; 147 148 sc = device_get_softc(dev); 149 150 sc->enum_hook.ich_func = ds1775_start; 151 sc->enum_hook.ich_arg = dev; 152 153 /* We have to wait until interrupts are enabled. I2C read and write 154 * only works if the interrupts are available. 155 * The unin/i2c is controlled by the htpic on unin. But this is not 156 * the master. The openpic on mac-io is controlling the htpic. 157 * This one gets attached after the mac-io probing and then the 158 * interrupts will be available. 159 */ 160 161 if (config_intrhook_establish(&sc->enum_hook) != 0) 162 return (ENOMEM); 163 164 return (0); 165 } 166 167 static void 168 ds1775_start(void *xdev) 169 { 170 phandle_t child; 171 struct ds1775_softc *sc; 172 struct sysctl_oid *oid, *sensroot_oid; 173 struct sysctl_ctx_list *ctx; 174 ssize_t plen; 175 int i; 176 char sysctl_name[40], sysctl_desc[40]; 177 178 device_t dev = (device_t)xdev; 179 180 sc = device_get_softc(dev); 181 182 child = ofw_bus_get_node(dev); 183 184 ctx = device_get_sysctl_ctx(dev); 185 sensroot_oid = SYSCTL_ADD_NODE(ctx, 186 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO, "sensor", 187 CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "DS1775 Sensor Information"); 188 189 if (OF_getprop(child, "hwsensor-zone", &sc->sc_sensor.zone, 190 sizeof(int)) < 0) 191 sc->sc_sensor.zone = 0; 192 193 plen = OF_getprop(child, "hwsensor-location", sc->sc_sensor.name, 194 sizeof(sc->sc_sensor.name)); 195 196 if (plen == -1) { 197 strcpy(sysctl_name, "sensor"); 198 } else { 199 for (i = 0; i < strlen(sc->sc_sensor.name); i++) { 200 sysctl_name[i] = tolower(sc->sc_sensor.name[i]); 201 if (isspace(sysctl_name[i])) 202 sysctl_name[i] = '_'; 203 } 204 sysctl_name[i] = 0; 205 } 206 207 /* Make up target temperatures. These are low, for the drive bay. */ 208 if (sc->sc_sensor.zone == 0) { 209 sc->sc_sensor.target_temp = 500 + ZERO_C_TO_K; 210 sc->sc_sensor.max_temp = 600 + ZERO_C_TO_K; 211 } 212 else { 213 sc->sc_sensor.target_temp = 300 + ZERO_C_TO_K; 214 sc->sc_sensor.max_temp = 600 + ZERO_C_TO_K; 215 } 216 217 sc->sc_sensor.read = 218 (int (*)(struct pmac_therm *sc))(ds1775_sensor_read); 219 pmac_thermal_sensor_register(&sc->sc_sensor); 220 221 sprintf(sysctl_desc,"%s %s", sc->sc_sensor.name, "(C)"); 222 oid = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(sensroot_oid), 223 OID_AUTO, sysctl_name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 224 "Sensor Information"); 225 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "temp", 226 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev, 227 0, ds1775_sensor_sysctl, "IK", sysctl_desc); 228 229 config_intrhook_disestablish(&sc->enum_hook); 230 } 231 232 static int 233 ds1775_sensor_read(struct ds1775_softc *sc) 234 { 235 uint16_t buf[2]; 236 uint16_t read; 237 int err; 238 239 err = ds1775_read_2(sc->sc_dev, sc->sc_addr, DS1775_TEMP, buf); 240 if (err < 0) 241 return (-1); 242 243 read = *((int16_t *)buf); 244 245 /* The default mode of the ADC is 9 bit, the resolution is 0.5 C per 246 bit. The temperature is in tenth kelvin. 247 */ 248 return (((int16_t)(read) >> 7) * 5 + ZERO_C_TO_K); 249 } 250 251 static int 252 ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS) 253 { 254 device_t dev; 255 struct ds1775_softc *sc; 256 int error; 257 int temp; 258 259 dev = arg1; 260 sc = device_get_softc(dev); 261 262 temp = ds1775_sensor_read(sc); 263 if (temp < 0) 264 return (EIO); 265 266 error = sysctl_handle_int(oidp, &temp, 0, req); 267 268 return (error); 269 } 270