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
adm1030_write_byte(device_t dev,uint32_t addr,uint8_t reg,uint8_t byte)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
adm1030_probe(device_t dev)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
adm1030_attach(device_t dev)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
adm1030_start(void * xdev)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
adm1030_set(struct adm1030_softc * fan,int pwm)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
adm1030_sysctl(SYSCTL_HANDLER_ARGS)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