1 /*- 2 * Copyright (c) 2011 Justin Hibbits 3 * Copyright (c) 2010 Andreas Tobler 4 * All rights reserved. 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/param.h> 29 #include <sys/bus.h> 30 #include <sys/systm.h> 31 #include <sys/module.h> 32 #include <sys/callout.h> 33 #include <sys/conf.h> 34 #include <sys/cpu.h> 35 #include <sys/ctype.h> 36 #include <sys/kernel.h> 37 #include <sys/kthread.h> 38 #include <sys/limits.h> 39 #include <sys/reboot.h> 40 #include <sys/rman.h> 41 #include <sys/sysctl.h> 42 #include <sys/unistd.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 struct adm1030_softc { 55 struct pmac_fan fan; 56 device_t sc_dev; 57 struct intr_config_hook enum_hook; 58 uint32_t sc_addr; 59 int sc_pwm; 60 }; 61 62 /* Regular bus attachment functions */ 63 static int adm1030_probe(device_t); 64 static int adm1030_attach(device_t); 65 66 /* Utility functions */ 67 static void adm1030_start(void *xdev); 68 static int adm1030_write_byte(device_t dev, uint32_t addr, uint8_t reg, uint8_t buf); 69 static int adm1030_set(struct adm1030_softc *fan, int pwm); 70 static int adm1030_sysctl(SYSCTL_HANDLER_ARGS); 71 72 static device_method_t adm1030_methods[] = { 73 /* Device interface */ 74 DEVMETHOD(device_probe, adm1030_probe), 75 DEVMETHOD(device_attach, adm1030_attach), 76 {0, 0}, 77 }; 78 79 static driver_t adm1030_driver = { 80 "adm1030", 81 adm1030_methods, 82 sizeof(struct adm1030_softc) 83 }; 84 85 DRIVER_MODULE(adm1030, iicbus, adm1030_driver, 0, 0); 86 87 static int 88 adm1030_write_byte(device_t dev, uint32_t addr, uint8_t reg, uint8_t byte) 89 { 90 unsigned char buf[4]; 91 int try = 0; 92 93 struct iic_msg msg[] = { 94 {addr, IIC_M_WR, 0, buf} 95 }; 96 97 msg[0].len = 2; 98 buf[0] = reg; 99 buf[1] = byte; 100 101 for (;;) 102 { 103 if (iicbus_transfer(dev, msg, 1) == 0) 104 return (0); 105 106 if (++try > 5) { 107 device_printf(dev, "iicbus write failed\n"); 108 return (-1); 109 } 110 pause("adm1030_write_byte", hz); 111 } 112 } 113 114 static int 115 adm1030_probe(device_t dev) 116 { 117 const char *name, *compatible; 118 struct adm1030_softc *sc; 119 phandle_t handle; 120 phandle_t thermostat; 121 122 name = ofw_bus_get_name(dev); 123 compatible = ofw_bus_get_compat(dev); 124 handle = ofw_bus_get_node(dev); 125 126 if (!name) 127 return (ENXIO); 128 129 if (strcmp(name, "fan") != 0 || strcmp(compatible, "adm1030") != 0) 130 return (ENXIO); 131 132 /* This driver can only be used if there's an associated temp sensor. */ 133 if (OF_getprop(handle, "platform-getTemp", &thermostat, sizeof(thermostat)) < 0) 134 return (ENXIO); 135 136 sc = device_get_softc(dev); 137 sc->sc_dev = dev; 138 sc->sc_addr = iicbus_get_addr(dev); 139 140 device_set_desc(dev, "G4 MDD Fan driver"); 141 142 return (0); 143 } 144 145 static int 146 adm1030_attach(device_t dev) 147 { 148 struct adm1030_softc *sc; 149 struct sysctl_ctx_list *ctx; 150 struct sysctl_oid *tree; 151 152 sc = device_get_softc(dev); 153 154 sc->enum_hook.ich_func = adm1030_start; 155 sc->enum_hook.ich_arg = dev; 156 157 /* 158 * Wait until interrupts are available, which won't be until the openpic is 159 * intialized. 160 */ 161 162 if (config_intrhook_establish(&sc->enum_hook) != 0) 163 return (ENOMEM); 164 165 ctx = device_get_sysctl_ctx(dev); 166 tree = device_get_sysctl_tree(dev); 167 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, "pwm", 168 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, dev, 169 0, adm1030_sysctl, "I", "Fan PWM Rate"); 170 171 return (0); 172 } 173 174 static void 175 adm1030_start(void *xdev) 176 { 177 struct adm1030_softc *sc; 178 179 device_t dev = (device_t) xdev; 180 181 sc = device_get_softc(dev); 182 183 /* Start the adm1030 device. */ 184 adm1030_write_byte(sc->sc_dev, sc->sc_addr, 0x1, 0x1); 185 adm1030_write_byte(sc->sc_dev, sc->sc_addr, 0x0, 0x95); 186 adm1030_write_byte(sc->sc_dev, sc->sc_addr, 0x23, 0x91); 187 188 /* Use the RPM fields as PWM duty cycles. */ 189 sc->fan.min_rpm = 0; 190 sc->fan.max_rpm = 0x0F; 191 sc->fan.default_rpm = 2; 192 193 strcpy(sc->fan.name, "MDD Case fan"); 194 sc->fan.zone = 0; 195 sc->fan.read = NULL; 196 sc->fan.set = (int (*)(struct pmac_fan *, int))adm1030_set; 197 config_intrhook_disestablish(&sc->enum_hook); 198 199 pmac_thermal_fan_register(&sc->fan); 200 } 201 202 static int adm1030_set(struct adm1030_softc *fan, int pwm) 203 { 204 /* Clamp the PWM to 0-0xF, one nibble. */ 205 if (pwm > 0xF) 206 pwm = 0xF; 207 if (pwm < 0) 208 pwm = 0; 209 210 if (adm1030_write_byte(fan->sc_dev, fan->sc_addr, 0x22, pwm) < 0) 211 return (-1); 212 213 fan->sc_pwm = pwm; 214 return (0); 215 } 216 217 static int 218 adm1030_sysctl(SYSCTL_HANDLER_ARGS) 219 { 220 device_t adm1030; 221 struct adm1030_softc *sc; 222 int pwm, error; 223 224 adm1030 = arg1; 225 sc = device_get_softc(adm1030); 226 227 pwm = sc->sc_pwm; 228 229 error = sysctl_handle_int(oidp, &pwm, 0, req); 230 231 if (error || !req->newptr) 232 return (error); 233 234 return (adm1030_set(sc, pwm)); 235 } 236