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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 struct smu_sensor {
47         cell_t  reg;
48         char    location[32];
49         enum {
50                 SMU_CURRENT_SENSOR,
51                 SMU_VOLTAGE_SENSOR,
52                 SMU_POWER_SENSOR,
53                 SMU_TEMP_SENSOR
54         } type;
55 };
56
57 static int      smusat_probe(device_t);
58 static int      smusat_attach(device_t);
59 static int      smusat_sensor_sysctl(SYSCTL_HANDLER_ARGS);
60
61 MALLOC_DEFINE(M_SMUSAT, "smusat", "SMU Sattelite Sensors");
62
63 static device_method_t  smusat_methods[] = {
64         /* Device interface */
65         DEVMETHOD(device_probe,         smusat_probe),
66         DEVMETHOD(device_attach,        smusat_attach),
67         { 0, 0 },
68 };
69
70 struct smusat_softc {
71         struct smu_sensor *sc_sensors;
72         int     sc_nsensors;
73
74         uint8_t sc_cache[16];
75         time_t  sc_last_update;
76 };
77
78 static driver_t smusat_driver = {
79         "smusat",
80         smusat_methods,
81         sizeof(struct smusat_softc)
82 };
83
84 static devclass_t smusat_devclass;
85
86 DRIVER_MODULE(smusat, iicbus, smusat_driver, smusat_devclass, 0, 0);
87
88 static int
89 smusat_probe(device_t dev)
90 {
91         const char *compat = ofw_bus_get_compat(dev);
92
93         if (compat == NULL || strcmp(compat, "smu-sat") != 0)
94                 return (ENXIO);
95
96         device_set_desc(dev, "SMU Satellite Sensors");
97         return (0);
98 }
99
100 static int
101 smusat_attach(device_t dev)
102 {
103         phandle_t child;
104         struct smu_sensor *sens;
105         struct smusat_softc *sc;
106         struct sysctl_oid *sensroot_oid;
107         struct sysctl_ctx_list *ctx;
108         char type[32];
109         int i;
110
111         sc = device_get_softc(dev);
112         sc->sc_nsensors = 0;
113         sc->sc_last_update = 0;
114
115         for (child = OF_child(ofw_bus_get_node(dev)); child != 0;
116             child = OF_peer(child))
117                 sc->sc_nsensors++;
118
119         if (sc->sc_nsensors == 0) {
120                 device_printf(dev, "WARNING: No sensors detected!\n");
121                 return (-1);
122         }
123             
124         sc->sc_sensors = malloc(sc->sc_nsensors * sizeof(struct smu_sensor),
125             M_SMUSAT, M_WAITOK | M_ZERO);
126
127         sens = sc->sc_sensors;
128         sc->sc_nsensors = 0;
129
130         ctx = device_get_sysctl_ctx(dev);
131         sensroot_oid = device_get_sysctl_tree(dev);
132
133         for (child = OF_child(ofw_bus_get_node(dev)); child != 0;
134             child = OF_peer(child)) {
135                 char sysctl_name[40], sysctl_desc[40];
136                 const char *units;
137
138                 sens->reg = 0;
139                 OF_getprop(child, "reg", &sens->reg, sizeof(sens->reg));
140                 if (sens->reg < 0x30)
141                         continue;
142
143                 sens->reg -= 0x30;
144                 OF_getprop(child, "location", sens->location,
145                     sizeof(sens->location));
146
147                 OF_getprop(child, "device_type", type, sizeof(type));
148
149                 if (strcmp(type, "current-sensor") == 0) {
150                         sens->type = SMU_CURRENT_SENSOR;
151                         units = "mA";
152                 } else if (strcmp(type, "temp-sensor") == 0) {
153                         sens->type = SMU_TEMP_SENSOR;
154                         units = "C";
155                 } else if (strcmp(type, "voltage-sensor") == 0) {
156                         sens->type = SMU_VOLTAGE_SENSOR;
157                         units = "mV";
158                 } else if (strcmp(type, "power-sensor") == 0) {
159                         sens->type = SMU_POWER_SENSOR;
160                         units = "mW";
161                 } else {
162                         continue;
163                 }
164
165                 for (i = 0; i < strlen(sens->location); i++) {
166                         sysctl_name[i] = tolower(sens->location[i]);
167                         if (isspace(sysctl_name[i]))
168                                 sysctl_name[i] = '_';
169                 }
170                 sysctl_name[i] = 0;
171
172                 sprintf(sysctl_desc,"%s (%s)", sens->location, units);
173                 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(sensroot_oid), OID_AUTO,
174                     sysctl_name, CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
175                     sc->sc_nsensors, smusat_sensor_sysctl, "I", sysctl_desc);
176
177                 sens++;
178                 sc->sc_nsensors++;
179         }
180
181         return (0);
182 }
183
184 static int
185 smusat_updatecache(device_t dev)
186 {
187         uint8_t reg = 0x3f;
188         struct smusat_softc *sc = device_get_softc(dev);
189         struct iic_msg msgs[2] = {
190             {0, IIC_M_WR | IIC_M_NOSTOP, 1, &reg},
191             {0, IIC_M_RD, 16, sc->sc_cache},
192         };
193
194         msgs[0].slave = msgs[1].slave = iicbus_get_addr(dev);
195         sc->sc_last_update = time_uptime;
196
197         return (iicbus_transfer(dev, msgs, 2));
198 }
199
200 static int
201 smusat_sensor_read(device_t dev, struct smu_sensor *sens, int *val)
202 {
203         int value;
204         struct smusat_softc *sc;
205
206         sc = device_get_softc(dev);
207
208         if (time_uptime - sc->sc_last_update > 1)
209                 smusat_updatecache(dev);
210
211         value = (sc->sc_cache[sens->reg*2] << 8) +
212             sc->sc_cache[sens->reg*2 + 1];
213
214         switch (sens->type) {
215         case SMU_TEMP_SENSOR:
216                 /* 16.16 */
217                 value <<= 10;
218                 /* Kill the .16 */
219                 value >>= 16;
220                 break;
221         case SMU_VOLTAGE_SENSOR:
222                 /* 16.16 */
223                 value <<= 4;
224                 /* Kill the .16 */
225                 value >>= 16;
226                 break;
227         case SMU_CURRENT_SENSOR:
228                 /* 16.16 */
229                 value <<= 8;
230                 /* Kill the .16 */
231                 value >>= 16;
232                 break;
233         case SMU_POWER_SENSOR:
234                 /* Doesn't exist */
235                 break;
236         }
237
238         *val = value;
239         return (0);
240 }
241
242 static int
243 smusat_sensor_sysctl(SYSCTL_HANDLER_ARGS)
244 {
245         device_t dev;
246         struct smusat_softc *sc;
247         struct smu_sensor *sens;
248         int value, error;
249
250         dev = arg1;
251         sc = device_get_softc(dev);
252         sens = &sc->sc_sensors[arg2];
253
254         error = smusat_sensor_read(dev, sens, &value);
255         if (error != 0)
256                 return (error);
257
258         error = sysctl_handle_int(oidp, &value, 0, req);
259
260         return (error);
261 }
262