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/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/kthread.h> 39 #include <sys/limits.h> 40 #include <sys/reboot.h> 41 #include <sys/rman.h> 42 #include <sys/sysctl.h> 43 #include <sys/unistd.h> 44 45 #include <machine/bus.h> 46 #include <machine/md_var.h> 47 48 #include <dev/iicbus/iicbus.h> 49 #include <dev/iicbus/iiconf.h> 50 51 #include <dev/ofw/openfirm.h> 52 #include <dev/ofw/ofw_bus.h> 53 #include <powerpc/powermac/powermac_thermal.h> 54 55 struct adm1030_softc { 56 struct pmac_fan fan; 57 device_t sc_dev; 58 struct intr_config_hook enum_hook; 59 uint32_t sc_addr; 60 int sc_pwm; 61 }; 62 63 /* Regular bus attachment functions */ 64 static int adm1030_probe(device_t); 65 static int adm1030_attach(device_t); 66 67 /* Utility functions */ 68 static void adm1030_start(void *xdev); 69 static int adm1030_write_byte(device_t dev, uint32_t addr, uint8_t reg, uint8_t buf); 70 static int adm1030_set(struct adm1030_softc *fan, int pwm); 71 static int adm1030_sysctl(SYSCTL_HANDLER_ARGS); 72 73 static device_method_t adm1030_methods[] = { 74 /* Device interface */ 75 DEVMETHOD(device_probe, adm1030_probe), 76 DEVMETHOD(device_attach, adm1030_attach), 77 {0, 0}, 78 }; 79 80 static driver_t adm1030_driver = { 81 "adm1030", 82 adm1030_methods, 83 sizeof(struct adm1030_softc) 84 }; 85 86 DRIVER_MODULE(adm1030, iicbus, adm1030_driver, 0, 0); 87 88 static int 89 adm1030_write_byte(device_t dev, uint32_t addr, uint8_t reg, uint8_t byte) 90 { 91 unsigned char buf[4]; 92 int try = 0; 93 94 struct iic_msg msg[] = { 95 {addr, IIC_M_WR, 0, buf} 96 }; 97 98 msg[0].len = 2; 99 buf[0] = reg; 100 buf[1] = byte; 101 102 for (;;) 103 { 104 if (iicbus_transfer(dev, msg, 1) == 0) 105 return (0); 106 107 if (++try > 5) { 108 device_printf(dev, "iicbus write failed\n"); 109 return (-1); 110 } 111 pause("adm1030_write_byte", hz); 112 } 113 } 114 115 static int 116 adm1030_probe(device_t dev) 117 { 118 const char *name, *compatible; 119 struct adm1030_softc *sc; 120 phandle_t handle; 121 phandle_t thermostat; 122 123 name = ofw_bus_get_name(dev); 124 compatible = ofw_bus_get_compat(dev); 125 handle = ofw_bus_get_node(dev); 126 127 if (!name) 128 return (ENXIO); 129 130 if (strcmp(name, "fan") != 0 || strcmp(compatible, "adm1030") != 0) 131 return (ENXIO); 132 133 /* This driver can only be used if there's an associated temp sensor. */ 134 if (OF_getprop(handle, "platform-getTemp", &thermostat, sizeof(thermostat)) < 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, "G4 MDD Fan driver"); 142 143 return (0); 144 } 145 146 static int 147 adm1030_attach(device_t dev) 148 { 149 struct adm1030_softc *sc; 150 struct sysctl_ctx_list *ctx; 151 struct sysctl_oid *tree; 152 153 sc = device_get_softc(dev); 154 155 sc->enum_hook.ich_func = adm1030_start; 156 sc->enum_hook.ich_arg = dev; 157 158 /* 159 * Wait until interrupts are available, which won't be until the openpic is 160 * intialized. 161 */ 162 163 if (config_intrhook_establish(&sc->enum_hook) != 0) 164 return (ENOMEM); 165 166 ctx = device_get_sysctl_ctx(dev); 167 tree = device_get_sysctl_tree(dev); 168 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, "pwm", 169 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, dev, 170 0, adm1030_sysctl, "I", "Fan PWM Rate"); 171 172 return (0); 173 } 174 175 static void 176 adm1030_start(void *xdev) 177 { 178 struct adm1030_softc *sc; 179 180 device_t dev = (device_t) xdev; 181 182 sc = device_get_softc(dev); 183 184 /* Start the adm1030 device. */ 185 adm1030_write_byte(sc->sc_dev, sc->sc_addr, 0x1, 0x1); 186 adm1030_write_byte(sc->sc_dev, sc->sc_addr, 0x0, 0x95); 187 adm1030_write_byte(sc->sc_dev, sc->sc_addr, 0x23, 0x91); 188 189 /* Use the RPM fields as PWM duty cycles. */ 190 sc->fan.min_rpm = 0; 191 sc->fan.max_rpm = 0x0F; 192 sc->fan.default_rpm = 2; 193 194 strcpy(sc->fan.name, "MDD Case fan"); 195 sc->fan.zone = 0; 196 sc->fan.read = NULL; 197 sc->fan.set = (int (*)(struct pmac_fan *, int))adm1030_set; 198 config_intrhook_disestablish(&sc->enum_hook); 199 200 pmac_thermal_fan_register(&sc->fan); 201 } 202 203 static int adm1030_set(struct adm1030_softc *fan, int pwm) 204 { 205 /* Clamp the PWM to 0-0xF, one nibble. */ 206 if (pwm > 0xF) 207 pwm = 0xF; 208 if (pwm < 0) 209 pwm = 0; 210 211 if (adm1030_write_byte(fan->sc_dev, fan->sc_addr, 0x22, pwm) < 0) 212 return (-1); 213 214 fan->sc_pwm = pwm; 215 return (0); 216 } 217 218 static int 219 adm1030_sysctl(SYSCTL_HANDLER_ARGS) 220 { 221 device_t adm1030; 222 struct adm1030_softc *sc; 223 int pwm, error; 224 225 adm1030 = arg1; 226 sc = device_get_softc(adm1030); 227 228 pwm = sc->sc_pwm; 229 230 error = sysctl_handle_int(oidp, &pwm, 0, req); 231 232 if (error || !req->newptr) 233 return (error); 234 235 return (adm1030_set(sc, pwm)); 236 } 237