1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2010 Nathan Whitehorn
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD: stable/12/sys/powerpc/powermac/smusat.c 326261 2017-11-27 15:09:59Z pfg $");
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/module.h>
36 #include <sys/bus.h>
37 #include <sys/conf.h>
38 #include <sys/cpu.h>
39 #include <sys/ctype.h>
40 #include <sys/kernel.h>
41 #include <sys/sysctl.h>
42
43 #include <dev/iicbus/iicbus.h>
44 #include <dev/iicbus/iiconf.h>
45 #include <dev/ofw/ofw_bus.h>
46 #include <dev/ofw/openfirm.h>
47
48 #include <powerpc/powermac/powermac_thermal.h>
49
50 struct smu_sensor {
51 struct pmac_therm therm;
52 device_t dev;
53
54 cell_t reg;
55 enum {
56 SMU_CURRENT_SENSOR,
57 SMU_VOLTAGE_SENSOR,
58 SMU_POWER_SENSOR,
59 SMU_TEMP_SENSOR
60 } type;
61 };
62
63 static int smusat_probe(device_t);
64 static int smusat_attach(device_t);
65 static int smusat_sensor_sysctl(SYSCTL_HANDLER_ARGS);
66 static int smusat_sensor_read(struct smu_sensor *sens);
67
68 static MALLOC_DEFINE(M_SMUSAT, "smusat", "SMU Sattelite Sensors");
69
70 static device_method_t smusat_methods[] = {
71 /* Device interface */
72 DEVMETHOD(device_probe, smusat_probe),
73 DEVMETHOD(device_attach, smusat_attach),
74 { 0, 0 },
75 };
76
77 struct smusat_softc {
78 struct smu_sensor *sc_sensors;
79 int sc_nsensors;
80
81 uint8_t sc_cache[16];
82 time_t sc_last_update;
83 };
84
85 static driver_t smusat_driver = {
86 "smusat",
87 smusat_methods,
88 sizeof(struct smusat_softc)
89 };
90
91 static devclass_t smusat_devclass;
92
93 DRIVER_MODULE(smusat, iicbus, smusat_driver, smusat_devclass, 0, 0);
94
95 static int
smusat_probe(device_t dev)96 smusat_probe(device_t dev)
97 {
98 const char *compat = ofw_bus_get_compat(dev);
99
100 if (compat == NULL || strcmp(compat, "smu-sat") != 0)
101 return (ENXIO);
102
103 device_set_desc(dev, "SMU Satellite Sensors");
104 return (0);
105 }
106
107 static int
smusat_attach(device_t dev)108 smusat_attach(device_t dev)
109 {
110 phandle_t child;
111 struct smu_sensor *sens;
112 struct smusat_softc *sc;
113 struct sysctl_oid *sensroot_oid;
114 struct sysctl_ctx_list *ctx;
115 char type[32];
116 int i;
117
118 sc = device_get_softc(dev);
119 sc->sc_nsensors = 0;
120 sc->sc_last_update = 0;
121
122 for (child = OF_child(ofw_bus_get_node(dev)); child != 0;
123 child = OF_peer(child))
124 sc->sc_nsensors++;
125
126 if (sc->sc_nsensors == 0) {
127 device_printf(dev, "WARNING: No sensors detected!\n");
128 return (-1);
129 }
130
131 sc->sc_sensors = malloc(sc->sc_nsensors * sizeof(struct smu_sensor),
132 M_SMUSAT, M_WAITOK | M_ZERO);
133
134 sens = sc->sc_sensors;
135 sc->sc_nsensors = 0;
136
137 ctx = device_get_sysctl_ctx(dev);
138 sensroot_oid = device_get_sysctl_tree(dev);
139
140 for (child = OF_child(ofw_bus_get_node(dev)); child != 0;
141 child = OF_peer(child)) {
142 char sysctl_name[40], sysctl_desc[40];
143 const char *units;
144
145 sens->dev = dev;
146 sens->reg = 0;
147 OF_getprop(child, "reg", &sens->reg, sizeof(sens->reg));
148 if (sens->reg < 0x30)
149 continue;
150 sens->reg -= 0x30;
151
152 OF_getprop(child, "zone", &sens->therm.zone, sizeof(int));
153 OF_getprop(child, "location", sens->therm.name,
154 sizeof(sens->therm.name));
155
156 OF_getprop(child, "device_type", type, sizeof(type));
157
158 if (strcmp(type, "current-sensor") == 0) {
159 sens->type = SMU_CURRENT_SENSOR;
160 units = "mA";
161 } else if (strcmp(type, "temp-sensor") == 0) {
162 sens->type = SMU_TEMP_SENSOR;
163 units = "C";
164 } else if (strcmp(type, "voltage-sensor") == 0) {
165 sens->type = SMU_VOLTAGE_SENSOR;
166 units = "mV";
167 } else if (strcmp(type, "power-sensor") == 0) {
168 sens->type = SMU_POWER_SENSOR;
169 units = "mW";
170 } else {
171 continue;
172 }
173
174 for (i = 0; i < strlen(sens->therm.name); i++) {
175 sysctl_name[i] = tolower(sens->therm.name[i]);
176 if (isspace(sysctl_name[i]))
177 sysctl_name[i] = '_';
178 }
179 sysctl_name[i] = 0;
180
181 sprintf(sysctl_desc,"%s (%s)", sens->therm.name, units);
182 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(sensroot_oid), OID_AUTO,
183 sysctl_name, CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
184 sc->sc_nsensors, smusat_sensor_sysctl,
185 (sens->type == SMU_TEMP_SENSOR) ? "IK" : "I", sysctl_desc);
186
187 if (sens->type == SMU_TEMP_SENSOR) {
188 /* Make up some numbers */
189 sens->therm.target_temp = 500 + 2731; /* 50 C */
190 sens->therm.max_temp = 900 + 2731; /* 90 C */
191 sens->therm.read =
192 (int (*)(struct pmac_therm *))smusat_sensor_read;
193 pmac_thermal_sensor_register(&sens->therm);
194 }
195
196 sens++;
197 sc->sc_nsensors++;
198 }
199
200 return (0);
201 }
202
203 static int
smusat_updatecache(device_t dev)204 smusat_updatecache(device_t dev)
205 {
206 uint8_t reg = 0x3f;
207 uint8_t value[16];
208 struct smusat_softc *sc = device_get_softc(dev);
209 int error;
210 struct iic_msg msgs[2] = {
211 {0, IIC_M_WR | IIC_M_NOSTOP, 1, ®},
212 {0, IIC_M_RD, 16, value},
213 };
214
215 msgs[0].slave = msgs[1].slave = iicbus_get_addr(dev);
216 error = iicbus_transfer(dev, msgs, 2);
217 if (error)
218 return (error);
219
220 sc->sc_last_update = time_uptime;
221 memcpy(sc->sc_cache, value, sizeof(value));
222 return (0);
223 }
224
225 static int
smusat_sensor_read(struct smu_sensor * sens)226 smusat_sensor_read(struct smu_sensor *sens)
227 {
228 int value, error;
229 device_t dev;
230 struct smusat_softc *sc;
231
232 dev = sens->dev;
233 sc = device_get_softc(dev);
234 error = 0;
235
236 if (time_uptime - sc->sc_last_update > 1)
237 error = smusat_updatecache(dev);
238 if (error)
239 return (-error);
240
241 value = (sc->sc_cache[sens->reg*2] << 8) +
242 sc->sc_cache[sens->reg*2 + 1];
243 if (value == 0xffff) {
244 sc->sc_last_update = 0; /* Result was bad, don't cache */
245 return (-EINVAL);
246 }
247
248 switch (sens->type) {
249 case SMU_TEMP_SENSOR:
250 /* 16.16 */
251 value <<= 10;
252 /* From 16.16 to 0.1 C */
253 value = 10*(value >> 16) + ((10*(value & 0xffff)) >> 16) + 2731;
254 break;
255 case SMU_VOLTAGE_SENSOR:
256 /* 16.16 */
257 value <<= 4;
258 /* Kill the .16 */
259 value >>= 16;
260 break;
261 case SMU_CURRENT_SENSOR:
262 /* 16.16 */
263 value <<= 8;
264 /* Kill the .16 */
265 value >>= 16;
266 break;
267 case SMU_POWER_SENSOR:
268 /* Doesn't exist */
269 break;
270 }
271
272 return (value);
273 }
274
275 static int
smusat_sensor_sysctl(SYSCTL_HANDLER_ARGS)276 smusat_sensor_sysctl(SYSCTL_HANDLER_ARGS)
277 {
278 device_t dev;
279 struct smusat_softc *sc;
280 struct smu_sensor *sens;
281 int value, error;
282
283 dev = arg1;
284 sc = device_get_softc(dev);
285 sens = &sc->sc_sensors[arg2];
286
287 value = smusat_sensor_read(sens);
288 if (value < 0)
289 return (EBUSY);
290
291 error = sysctl_handle_int(oidp, &value, 0, req);
292
293 return (error);
294 }
295
296