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1 /*-
2  * Copyright (c) 2010 Nathan Whitehorn
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
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/module.h>
34 #include <sys/bus.h>
35 #include <sys/conf.h>
36 #include <sys/cpu.h>
37 #include <sys/ctype.h>
38 #include <sys/kernel.h>
39 #include <sys/sysctl.h>
40
41 #include <dev/iicbus/iicbus.h>
42 #include <dev/iicbus/iiconf.h>
43 #include <dev/ofw/ofw_bus.h>
44 #include <dev/ofw/openfirm.h>
45
46 #include <powerpc/powermac/powermac_thermal.h>
47
48 struct smu_sensor {
49         struct pmac_therm therm;
50         device_t dev;
51
52         cell_t  reg;
53         enum {
54                 SMU_CURRENT_SENSOR,
55                 SMU_VOLTAGE_SENSOR,
56                 SMU_POWER_SENSOR,
57                 SMU_TEMP_SENSOR
58         } type;
59 };
60
61 static int      smusat_probe(device_t);
62 static int      smusat_attach(device_t);
63 static int      smusat_sensor_sysctl(SYSCTL_HANDLER_ARGS);
64 static int      smusat_sensor_read(struct smu_sensor *sens);
65
66 static MALLOC_DEFINE(M_SMUSAT, "smusat", "SMU Sattelite Sensors");
67
68 static device_method_t  smusat_methods[] = {
69         /* Device interface */
70         DEVMETHOD(device_probe,         smusat_probe),
71         DEVMETHOD(device_attach,        smusat_attach),
72         { 0, 0 },
73 };
74
75 struct smusat_softc {
76         struct smu_sensor *sc_sensors;
77         int     sc_nsensors;
78
79         uint8_t sc_cache[16];
80         time_t  sc_last_update;
81 };
82
83 static driver_t smusat_driver = {
84         "smusat",
85         smusat_methods,
86         sizeof(struct smusat_softc)
87 };
88
89 static devclass_t smusat_devclass;
90
91 DRIVER_MODULE(smusat, iicbus, smusat_driver, smusat_devclass, 0, 0);
92
93 static int
94 smusat_probe(device_t dev)
95 {
96         const char *compat = ofw_bus_get_compat(dev);
97
98         if (compat == NULL || strcmp(compat, "smu-sat") != 0)
99                 return (ENXIO);
100
101         device_set_desc(dev, "SMU Satellite Sensors");
102         return (0);
103 }
104
105 static int
106 smusat_attach(device_t dev)
107 {
108         phandle_t child;
109         struct smu_sensor *sens;
110         struct smusat_softc *sc;
111         struct sysctl_oid *sensroot_oid;
112         struct sysctl_ctx_list *ctx;
113         char type[32];
114         int i;
115
116         sc = device_get_softc(dev);
117         sc->sc_nsensors = 0;
118         sc->sc_last_update = 0;
119
120         for (child = OF_child(ofw_bus_get_node(dev)); child != 0;
121             child = OF_peer(child))
122                 sc->sc_nsensors++;
123
124         if (sc->sc_nsensors == 0) {
125                 device_printf(dev, "WARNING: No sensors detected!\n");
126                 return (-1);
127         }
128             
129         sc->sc_sensors = malloc(sc->sc_nsensors * sizeof(struct smu_sensor),
130             M_SMUSAT, M_WAITOK | M_ZERO);
131
132         sens = sc->sc_sensors;
133         sc->sc_nsensors = 0;
134
135         ctx = device_get_sysctl_ctx(dev);
136         sensroot_oid = device_get_sysctl_tree(dev);
137
138         for (child = OF_child(ofw_bus_get_node(dev)); child != 0;
139             child = OF_peer(child)) {
140                 char sysctl_name[40], sysctl_desc[40];
141                 const char *units;
142
143                 sens->dev = dev;
144                 sens->reg = 0;
145                 OF_getprop(child, "reg", &sens->reg, sizeof(sens->reg));
146                 if (sens->reg < 0x30)
147                         continue;
148                 sens->reg -= 0x30;
149
150                 OF_getprop(child, "zone", &sens->therm.zone, sizeof(int));
151                 OF_getprop(child, "location", sens->therm.name,
152                     sizeof(sens->therm.name));
153
154                 OF_getprop(child, "device_type", type, sizeof(type));
155
156                 if (strcmp(type, "current-sensor") == 0) {
157                         sens->type = SMU_CURRENT_SENSOR;
158                         units = "mA";
159                 } else if (strcmp(type, "temp-sensor") == 0) {
160                         sens->type = SMU_TEMP_SENSOR;
161                         units = "C";
162                 } else if (strcmp(type, "voltage-sensor") == 0) {
163                         sens->type = SMU_VOLTAGE_SENSOR;
164                         units = "mV";
165                 } else if (strcmp(type, "power-sensor") == 0) {
166                         sens->type = SMU_POWER_SENSOR;
167                         units = "mW";
168                 } else {
169                         continue;
170                 }
171
172                 for (i = 0; i < strlen(sens->therm.name); i++) {
173                         sysctl_name[i] = tolower(sens->therm.name[i]);
174                         if (isspace(sysctl_name[i]))
175                                 sysctl_name[i] = '_';
176                 }
177                 sysctl_name[i] = 0;
178
179                 sprintf(sysctl_desc,"%s (%s)", sens->therm.name, units);
180                 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(sensroot_oid), OID_AUTO,
181                     sysctl_name, CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
182                     sc->sc_nsensors, smusat_sensor_sysctl,
183                     (sens->type == SMU_TEMP_SENSOR) ? "IK" : "I", sysctl_desc);
184
185                 if (sens->type == SMU_TEMP_SENSOR) {
186                         /* Make up some numbers */
187                         sens->therm.target_temp = 500 + 2732; /* 50 C */
188                         sens->therm.max_temp = 900 + 2732; /* 90 C */
189                         sens->therm.read =
190                             (int (*)(struct pmac_therm *))smusat_sensor_read;
191                         pmac_thermal_sensor_register(&sens->therm);
192                 }
193
194                 sens++;
195                 sc->sc_nsensors++;
196         }
197
198         return (0);
199 }
200
201 static int
202 smusat_updatecache(device_t dev)
203 {
204         uint8_t reg = 0x3f;
205         uint8_t value[16];
206         struct smusat_softc *sc = device_get_softc(dev);
207         int error;
208         struct iic_msg msgs[2] = {
209             {0, IIC_M_WR | IIC_M_NOSTOP, 1, &reg},
210             {0, IIC_M_RD, 16, value},
211         };
212
213         msgs[0].slave = msgs[1].slave = iicbus_get_addr(dev);
214         error = iicbus_transfer(dev, msgs, 2);
215         if (error)
216                 return (error);
217
218         sc->sc_last_update = time_uptime;
219         memcpy(sc->sc_cache, value, sizeof(value));
220         return (0);
221 }
222
223 static int
224 smusat_sensor_read(struct smu_sensor *sens)
225 {
226         int value, error;
227         device_t dev;
228         struct smusat_softc *sc;
229
230         dev = sens->dev;
231         sc = device_get_softc(dev);
232         error = 0;
233
234         if (time_uptime - sc->sc_last_update > 1)
235                 error = smusat_updatecache(dev);
236         if (error)
237                 return (-error);
238
239         value = (sc->sc_cache[sens->reg*2] << 8) +
240             sc->sc_cache[sens->reg*2 + 1];
241         if (value == 0xffff) {
242                 sc->sc_last_update = 0; /* Result was bad, don't cache */
243                 return (-EINVAL);
244         }
245
246         switch (sens->type) {
247         case SMU_TEMP_SENSOR:
248                 /* 16.16 */
249                 value <<= 10;
250                 /* From 16.16 to 0.1 C */
251                 value = 10*(value >> 16) + ((10*(value & 0xffff)) >> 16) + 2732;
252                 break;
253         case SMU_VOLTAGE_SENSOR:
254                 /* 16.16 */
255                 value <<= 4;
256                 /* Kill the .16 */
257                 value >>= 16;
258                 break;
259         case SMU_CURRENT_SENSOR:
260                 /* 16.16 */
261                 value <<= 8;
262                 /* Kill the .16 */
263                 value >>= 16;
264                 break;
265         case SMU_POWER_SENSOR:
266                 /* Doesn't exist */
267                 break;
268         }
269
270         return (value);
271 }
272
273 static int
274 smusat_sensor_sysctl(SYSCTL_HANDLER_ARGS)
275 {
276         device_t dev;
277         struct smusat_softc *sc;
278         struct smu_sensor *sens;
279         int value, error;
280
281         dev = arg1;
282         sc = device_get_softc(dev);
283         sens = &sc->sc_sensors[arg2];
284
285         value = smusat_sensor_read(sens);
286         if (value < 0)
287                 return (EBUSY);
288
289         error = sysctl_handle_int(oidp, &value, 0, req);
290
291         return (error);
292 }
293