ds1775.c revision 222658
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 222658 2011-06-03 18:58:32Z 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#define FCU_ZERO_C_TO_K 2732 55 56/* Drivebay sensor: LM75/DS1775. */ 57#define DS1775_TEMP 0x0 58 59/* Regular bus attachment functions */ 60static int ds1775_probe(device_t); 61static int ds1775_attach(device_t); 62 63struct ds1775_softc { 64 struct pmac_therm sc_sensor; 65 device_t sc_dev; 66 struct intr_config_hook enum_hook; 67 uint32_t sc_addr; 68}; 69 70/* Utility functions */ 71static int ds1775_sensor_read(struct ds1775_softc *sc); 72static int ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS); 73static void ds1775_start(void *xdev); 74static int ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg, 75 uint16_t *data); 76 77static device_method_t ds1775_methods[] = { 78 /* Device interface */ 79 DEVMETHOD(device_probe, ds1775_probe), 80 DEVMETHOD(device_attach, ds1775_attach), 81 { 0, 0 }, 82}; 83 84static driver_t ds1775_driver = { 85 "ds1775", 86 ds1775_methods, 87 sizeof(struct ds1775_softc) 88}; 89 90static devclass_t ds1775_devclass; 91 92DRIVER_MODULE(ds1755, iicbus, ds1775_driver, ds1775_devclass, 0, 0); 93 94static int 95ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg, uint16_t *data) 96{ 97 uint8_t buf[4]; 98 int err, try = 0; 99 100 struct iic_msg msg[2] = { 101 { addr, IIC_M_WR | IIC_M_NOSTOP, 1, ® }, 102 { addr, IIC_M_RD, 2, buf }, 103 }; 104 105 for (;;) 106 { 107 err = iicbus_transfer(dev, msg, 2); 108 if (err != 0) 109 goto retry; 110 111 *data = *((uint16_t*)buf); 112 return (0); 113 retry: 114 if (++try > 5) { 115 device_printf(dev, "iicbus read failed\n"); 116 return (-1); 117 } 118 pause("ds1775_read_2", hz); 119 } 120} 121 122static int 123ds1775_probe(device_t dev) 124{ 125 const char *name, *compatible; 126 struct ds1775_softc *sc; 127 128 name = ofw_bus_get_name(dev); 129 compatible = ofw_bus_get_compat(dev); 130 131 if (!name) 132 return (ENXIO); 133 134 if (strcmp(name, "temp-monitor") != 0 || 135 (strcmp(compatible, "ds1775") != 0 && 136 strcmp(compatible, "lm75") != 0)) 137 return (ENXIO); 138 139 sc = device_get_softc(dev); 140 sc->sc_dev = dev; 141 sc->sc_addr = iicbus_get_addr(dev); 142 143 device_set_desc(dev, "Temp-Monitor DS1775"); 144 145 return (0); 146} 147 148static int 149ds1775_attach(device_t dev) 150{ 151 struct ds1775_softc *sc; 152 153 sc = device_get_softc(dev); 154 155 sc->enum_hook.ich_func = ds1775_start; 156 sc->enum_hook.ich_arg = dev; 157 158 /* We have to wait until interrupts are enabled. I2C read and write 159 * only works if the interrupts are available. 160 * The unin/i2c is controlled by the htpic on unin. But this is not 161 * the master. The openpic on mac-io is controlling the htpic. 162 * This one gets attached after the mac-io probing and then the 163 * interrupts will be available. 164 */ 165 166 if (config_intrhook_establish(&sc->enum_hook) != 0) 167 return (ENOMEM); 168 169 return (0); 170} 171 172static void 173ds1775_start(void *xdev) 174{ 175 phandle_t child; 176 struct ds1775_softc *sc; 177 struct sysctl_oid *sensroot_oid; 178 struct sysctl_ctx_list *ctx; 179 ssize_t plen; 180 int i; 181 char sysctl_name[40], sysctl_desc[40]; 182 const char *units; 183 184 device_t dev = (device_t)xdev; 185 186 sc = device_get_softc(dev); 187 188 child = ofw_bus_get_node(dev); 189 190 ctx = device_get_sysctl_ctx(dev); 191 sensroot_oid = device_get_sysctl_tree(dev); 192 193 if (OF_getprop(child, "hwsensor-zone", &sc->sc_sensor.zone, 194 sizeof(int)) < 0) 195 sc->sc_sensor.zone = 0; 196 197 plen = OF_getprop(child, "hwsensor-location", sc->sc_sensor.name, 198 sizeof(sc->sc_sensor.name)); 199 units = "C"; 200 201 if (plen == -1) { 202 strcpy(sysctl_name, "sensor"); 203 } else { 204 for (i = 0; i < strlen(sc->sc_sensor.name); i++) { 205 sysctl_name[i] = tolower(sc->sc_sensor.name[i]); 206 if (isspace(sysctl_name[i])) 207 sysctl_name[i] = '_'; 208 } 209 sysctl_name[i] = 0; 210 } 211 212 /* Make up target temperatures. These are low, for the drive bay. */ 213 if (sc->sc_sensor.zone == 0) { 214 sc->sc_sensor.target_temp = 500 + FCU_ZERO_C_TO_K; 215 sc->sc_sensor.max_temp = 600 + FCU_ZERO_C_TO_K; 216 } 217 else { 218 sc->sc_sensor.target_temp = 300 + FCU_ZERO_C_TO_K; 219 sc->sc_sensor.max_temp = 600 + FCU_ZERO_C_TO_K; 220 } 221 222 sc->sc_sensor.read = 223 (int (*)(struct pmac_therm *sc))(ds1775_sensor_read); 224 pmac_thermal_sensor_register(&sc->sc_sensor); 225 226 sprintf(sysctl_desc,"%s (%s)", sc->sc_sensor.name, units); 227 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(sensroot_oid), OID_AUTO, 228 sysctl_name, 229 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev, 230 0, ds1775_sensor_sysctl, "IK", sysctl_desc); 231 232 config_intrhook_disestablish(&sc->enum_hook); 233} 234 235static int 236ds1775_sensor_read(struct ds1775_softc *sc) 237{ 238 uint16_t buf[2]; 239 uint16_t read; 240 int err; 241 242 err = ds1775_read_2(sc->sc_dev, sc->sc_addr, DS1775_TEMP, buf); 243 if (err < 0) 244 return (-1); 245 246 read = *((int16_t *)buf); 247 248 /* The default mode of the ADC is 9 bit, the resolution is 0.5 C per 249 bit. The temperature is in tenth kelvin. 250 */ 251 return (((int16_t)(read) >> 7) * 5 + FCU_ZERO_C_TO_K); 252} 253 254static int 255ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS) 256{ 257 device_t dev; 258 struct ds1775_softc *sc; 259 int error; 260 unsigned int temp; 261 262 dev = arg1; 263 sc = device_get_softc(dev); 264 265 temp = ds1775_sensor_read(sc); 266 if (temp < 0) 267 return (EIO); 268 269 error = sysctl_handle_int(oidp, &temp, 0, req); 270 271 return (error); 272} 273