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 static devclass_t adm1030_devclass;
87
88 DRIVER_MODULE(adm1030, iicbus, adm1030_driver, adm1030_devclass, 0, 0);
89
90 static int
adm1030_write_byte(device_t dev,uint32_t addr,uint8_t reg,uint8_t byte)91 adm1030_write_byte(device_t dev, uint32_t addr, uint8_t reg, uint8_t byte)
92 {
93 unsigned char buf[4];
94 int try = 0;
95
96 struct iic_msg msg[] = {
97 {addr, IIC_M_WR, 0, buf}
98 };
99
100 msg[0].len = 2;
101 buf[0] = reg;
102 buf[1] = byte;
103
104 for (;;)
105 {
106 if (iicbus_transfer(dev, msg, 1) == 0)
107 return (0);
108
109 if (++try > 5) {
110 device_printf(dev, "iicbus write failed\n");
111 return (-1);
112 }
113 pause("adm1030_write_byte", hz);
114 }
115 }
116
117 static int
adm1030_probe(device_t dev)118 adm1030_probe(device_t dev)
119 {
120 const char *name, *compatible;
121 struct adm1030_softc *sc;
122 phandle_t handle;
123 phandle_t thermostat;
124
125 name = ofw_bus_get_name(dev);
126 compatible = ofw_bus_get_compat(dev);
127 handle = ofw_bus_get_node(dev);
128
129 if (!name)
130 return (ENXIO);
131
132 if (strcmp(name, "fan") != 0 || strcmp(compatible, "adm1030") != 0)
133 return (ENXIO);
134
135 /* This driver can only be used if there's an associated temp sensor. */
136 if (OF_getprop(handle, "platform-getTemp", &thermostat, sizeof(thermostat)) < 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, "G4 MDD Fan driver");
144
145 return (0);
146 }
147
148 static int
adm1030_attach(device_t dev)149 adm1030_attach(device_t dev)
150 {
151 struct adm1030_softc *sc;
152 struct sysctl_ctx_list *ctx;
153 struct sysctl_oid *tree;
154
155 sc = device_get_softc(dev);
156
157 sc->enum_hook.ich_func = adm1030_start;
158 sc->enum_hook.ich_arg = dev;
159
160 /*
161 * Wait until interrupts are available, which won't be until the openpic is
162 * intialized.
163 */
164
165 if (config_intrhook_establish(&sc->enum_hook) != 0)
166 return (ENOMEM);
167
168 ctx = device_get_sysctl_ctx(dev);
169 tree = device_get_sysctl_tree(dev);
170 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, "pwm",
171 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, dev,
172 0, adm1030_sysctl, "I", "Fan PWM Rate");
173
174 return (0);
175 }
176
177 static void
adm1030_start(void * xdev)178 adm1030_start(void *xdev)
179 {
180 struct adm1030_softc *sc;
181
182 device_t dev = (device_t) xdev;
183
184 sc = device_get_softc(dev);
185
186 /* Start the adm1030 device. */
187 adm1030_write_byte(sc->sc_dev, sc->sc_addr, 0x1, 0x1);
188 adm1030_write_byte(sc->sc_dev, sc->sc_addr, 0x0, 0x95);
189 adm1030_write_byte(sc->sc_dev, sc->sc_addr, 0x23, 0x91);
190
191 /* Use the RPM fields as PWM duty cycles. */
192 sc->fan.min_rpm = 0;
193 sc->fan.max_rpm = 0x0F;
194 sc->fan.default_rpm = 2;
195
196 strcpy(sc->fan.name, "MDD Case fan");
197 sc->fan.zone = 0;
198 sc->fan.read = NULL;
199 sc->fan.set = (int (*)(struct pmac_fan *, int))adm1030_set;
200 config_intrhook_disestablish(&sc->enum_hook);
201
202 pmac_thermal_fan_register(&sc->fan);
203 }
204
adm1030_set(struct adm1030_softc * fan,int pwm)205 static int adm1030_set(struct adm1030_softc *fan, int pwm)
206 {
207 /* Clamp the PWM to 0-0xF, one nibble. */
208 if (pwm > 0xF)
209 pwm = 0xF;
210 if (pwm < 0)
211 pwm = 0;
212
213 if (adm1030_write_byte(fan->sc_dev, fan->sc_addr, 0x22, pwm) < 0)
214 return (-1);
215
216 fan->sc_pwm = pwm;
217 return (0);
218 }
219
220 static int
adm1030_sysctl(SYSCTL_HANDLER_ARGS)221 adm1030_sysctl(SYSCTL_HANDLER_ARGS)
222 {
223 device_t adm1030;
224 struct adm1030_softc *sc;
225 int pwm, error;
226
227 adm1030 = arg1;
228 sc = device_get_softc(adm1030);
229
230 pwm = sc->sc_pwm;
231
232 error = sysctl_handle_int(oidp, &pwm, 0, req);
233
234 if (error || !req->newptr)
235 return (error);
236
237 return (adm1030_set(sc, pwm));
238 }
239