ds1775.c revision 222673
1/*- 2 * Copyright (c) 2010 Andreas Tobler 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 19 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 21 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 22 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/dev/iicbus/ds1775.c 222673 2011-06-04 09:19:53Z andreast $"); 29 30#include <sys/param.h> 31#include <sys/bus.h> 32#include <sys/systm.h> 33#include <sys/module.h> 34#include <sys/callout.h> 35#include <sys/conf.h> 36#include <sys/cpu.h> 37#include <sys/ctype.h> 38#include <sys/kernel.h> 39#include <sys/reboot.h> 40#include <sys/rman.h> 41#include <sys/sysctl.h> 42#include <sys/limits.h> 43 44#include <machine/bus.h> 45#include <machine/md_var.h> 46 47#include <dev/iicbus/iicbus.h> 48#include <dev/iicbus/iiconf.h> 49 50#include <dev/ofw/openfirm.h> 51#include <dev/ofw/ofw_bus.h> 52#include <powerpc/powermac/powermac_thermal.h> 53 54/* Drivebay sensor: LM75/DS1775. */ 55#define DS1775_TEMP 0x0 56 57/* Regular bus attachment functions */ 58static int ds1775_probe(device_t); 59static int ds1775_attach(device_t); 60 61struct ds1775_softc { 62 struct pmac_therm sc_sensor; 63 device_t sc_dev; 64 struct intr_config_hook enum_hook; 65 uint32_t sc_addr; 66}; 67 68/* Utility functions */ 69static int ds1775_sensor_read(struct ds1775_softc *sc); 70static int ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS); 71static void ds1775_start(void *xdev); 72static int ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg, 73 uint16_t *data); 74 75static device_method_t ds1775_methods[] = { 76 /* Device interface */ 77 DEVMETHOD(device_probe, ds1775_probe), 78 DEVMETHOD(device_attach, ds1775_attach), 79 { 0, 0 }, 80}; 81 82static driver_t ds1775_driver = { 83 "ds1775", 84 ds1775_methods, 85 sizeof(struct ds1775_softc) 86}; 87 88static devclass_t ds1775_devclass; 89 90DRIVER_MODULE(ds1755, iicbus, ds1775_driver, ds1775_devclass, 0, 0); 91 92static int 93ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg, uint16_t *data) 94{ 95 uint8_t buf[4]; 96 int err, try = 0; 97 98 struct iic_msg msg[2] = { 99 { addr, IIC_M_WR | IIC_M_NOSTOP, 1, ® }, 100 { addr, IIC_M_RD, 2, buf }, 101 }; 102 103 for (;;) 104 { 105 err = iicbus_transfer(dev, msg, 2); 106 if (err != 0) 107 goto retry; 108 109 *data = *((uint16_t*)buf); 110 return (0); 111 retry: 112 if (++try > 5) { 113 device_printf(dev, "iicbus read failed\n"); 114 return (-1); 115 } 116 pause("ds1775_read_2", hz); 117 } 118} 119 120static int 121ds1775_probe(device_t dev) 122{ 123 const char *name, *compatible; 124 struct ds1775_softc *sc; 125 126 name = ofw_bus_get_name(dev); 127 compatible = ofw_bus_get_compat(dev); 128 129 if (!name) 130 return (ENXIO); 131 132 if (strcmp(name, "temp-monitor") != 0 || 133 (strcmp(compatible, "ds1775") != 0 && 134 strcmp(compatible, "lm75") != 0)) 135 return (ENXIO); 136 137 sc = device_get_softc(dev); 138 sc->sc_dev = dev; 139 sc->sc_addr = iicbus_get_addr(dev); 140 141 device_set_desc(dev, "Temp-Monitor DS1775"); 142 143 return (0); 144} 145 146static int 147ds1775_attach(device_t dev) 148{ 149 struct ds1775_softc *sc; 150 151 sc = device_get_softc(dev); 152 153 sc->enum_hook.ich_func = ds1775_start; 154 sc->enum_hook.ich_arg = dev; 155 156 /* We have to wait until interrupts are enabled. I2C read and write 157 * only works if the interrupts are available. 158 * The unin/i2c is controlled by the htpic on unin. But this is not 159 * the master. The openpic on mac-io is controlling the htpic. 160 * This one gets attached after the mac-io probing and then the 161 * interrupts will be available. 162 */ 163 164 if (config_intrhook_establish(&sc->enum_hook) != 0) 165 return (ENOMEM); 166 167 return (0); 168} 169 170static void 171ds1775_start(void *xdev) 172{ 173 phandle_t child; 174 struct ds1775_softc *sc; 175 struct sysctl_oid *sensroot_oid; 176 struct sysctl_ctx_list *ctx; 177 ssize_t plen; 178 int i; 179 char sysctl_name[40], sysctl_desc[40]; 180 const char *units; 181 182 device_t dev = (device_t)xdev; 183 184 sc = device_get_softc(dev); 185 186 child = ofw_bus_get_node(dev); 187 188 ctx = device_get_sysctl_ctx(dev); 189 sensroot_oid = device_get_sysctl_tree(dev); 190 191 if (OF_getprop(child, "hwsensor-zone", &sc->sc_sensor.zone, 192 sizeof(int)) < 0) 193 sc->sc_sensor.zone = 0; 194 195 plen = OF_getprop(child, "hwsensor-location", sc->sc_sensor.name, 196 sizeof(sc->sc_sensor.name)); 197 units = "C"; 198 199 if (plen == -1) { 200 strcpy(sysctl_name, "sensor"); 201 } else { 202 for (i = 0; i < strlen(sc->sc_sensor.name); i++) { 203 sysctl_name[i] = tolower(sc->sc_sensor.name[i]); 204 if (isspace(sysctl_name[i])) 205 sysctl_name[i] = '_'; 206 } 207 sysctl_name[i] = 0; 208 } 209 210 /* Make up target temperatures. These are low, for the drive bay. */ 211 if (sc->sc_sensor.zone == 0) { 212 sc->sc_sensor.target_temp = 500 + ZERO_C_TO_K; 213 sc->sc_sensor.max_temp = 600 + ZERO_C_TO_K; 214 } 215 else { 216 sc->sc_sensor.target_temp = 300 + ZERO_C_TO_K; 217 sc->sc_sensor.max_temp = 600 + ZERO_C_TO_K; 218 } 219 220 sc->sc_sensor.read = 221 (int (*)(struct pmac_therm *sc))(ds1775_sensor_read); 222 pmac_thermal_sensor_register(&sc->sc_sensor); 223 224 sprintf(sysctl_desc,"%s (%s)", sc->sc_sensor.name, units); 225 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(sensroot_oid), OID_AUTO, 226 sysctl_name, 227 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev, 228 0, ds1775_sensor_sysctl, "IK", sysctl_desc); 229 230 config_intrhook_disestablish(&sc->enum_hook); 231} 232 233static int 234ds1775_sensor_read(struct ds1775_softc *sc) 235{ 236 uint16_t buf[2]; 237 uint16_t read; 238 int err; 239 240 err = ds1775_read_2(sc->sc_dev, sc->sc_addr, DS1775_TEMP, buf); 241 if (err < 0) 242 return (-1); 243 244 read = *((int16_t *)buf); 245 246 /* The default mode of the ADC is 9 bit, the resolution is 0.5 C per 247 bit. The temperature is in tenth kelvin. 248 */ 249 return (((int16_t)(read) >> 7) * 5 + ZERO_C_TO_K); 250} 251 252static int 253ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS) 254{ 255 device_t dev; 256 struct ds1775_softc *sc; 257 int error; 258 unsigned int temp; 259 260 dev = arg1; 261 sc = device_get_softc(dev); 262 263 temp = ds1775_sensor_read(sc); 264 if (temp < 0) 265 return (EIO); 266 267 error = sysctl_handle_int(oidp, &temp, 0, req); 268 269 return (error); 270} 271