1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2010 Andreas Tobler
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/reboot.h>
38 #include <sys/rman.h>
39 #include <sys/sysctl.h>
40 #include <sys/limits.h>
41
42 #include <machine/bus.h>
43 #include <machine/md_var.h>
44
45 #include <dev/iicbus/iicbus.h>
46 #include <dev/iicbus/iiconf.h>
47
48 #include <dev/ofw/openfirm.h>
49 #include <dev/ofw/ofw_bus.h>
50 #include <powerpc/powermac/powermac_thermal.h>
51
52 /* Drivebay sensor: LM75/DS1775. */
53 #define DS1775_TEMP 0x0
54
55 /* Regular bus attachment functions */
56 static int ds1775_probe(device_t);
57 static int ds1775_attach(device_t);
58
59 struct ds1775_softc {
60 struct pmac_therm sc_sensor;
61 device_t sc_dev;
62 struct intr_config_hook enum_hook;
63 uint32_t sc_addr;
64 };
65
66 /* Utility functions */
67 static int ds1775_sensor_read(struct ds1775_softc *sc);
68 static int ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS);
69 static void ds1775_start(void *xdev);
70 static int ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg,
71 uint16_t *data);
72
73 static device_method_t ds1775_methods[] = {
74 /* Device interface */
75 DEVMETHOD(device_probe, ds1775_probe),
76 DEVMETHOD(device_attach, ds1775_attach),
77 { 0, 0 },
78 };
79
80 static driver_t ds1775_driver = {
81 "ds1775",
82 ds1775_methods,
83 sizeof(struct ds1775_softc)
84 };
85
86 DRIVER_MODULE(ds1775, iicbus, ds1775_driver, 0, 0);
87
88 static int
ds1775_read_2(device_t dev,uint32_t addr,uint8_t reg,uint16_t * data)89 ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg, uint16_t *data)
90 {
91 uint8_t buf[4];
92 int err, try = 0;
93
94 struct iic_msg msg[2] = {
95 { addr, IIC_M_WR | IIC_M_NOSTOP, 1, ® },
96 { addr, IIC_M_RD, 2, buf },
97 };
98
99 for (;;)
100 {
101 err = iicbus_transfer(dev, msg, nitems(msg));
102 if (err != 0)
103 goto retry;
104
105 *data = *((uint16_t*)buf);
106 return (0);
107 retry:
108 if (++try > 5) {
109 device_printf(dev, "iicbus read failed\n");
110 return (-1);
111 }
112 pause("ds1775_read_2", hz);
113 }
114 }
115
116 static int
ds1775_probe(device_t dev)117 ds1775_probe(device_t dev)
118 {
119 const char *name, *compatible;
120 struct ds1775_softc *sc;
121
122 name = ofw_bus_get_name(dev);
123 compatible = ofw_bus_get_compat(dev);
124
125 if (!name)
126 return (ENXIO);
127
128 if (strcmp(name, "temp-monitor") != 0 ||
129 (strcmp(compatible, "ds1775") != 0 &&
130 strcmp(compatible, "lm75") != 0))
131 return (ENXIO);
132
133 sc = device_get_softc(dev);
134 sc->sc_dev = dev;
135 sc->sc_addr = iicbus_get_addr(dev);
136
137 device_set_desc(dev, "Temp-Monitor DS1775");
138
139 return (0);
140 }
141
142 static int
ds1775_attach(device_t dev)143 ds1775_attach(device_t dev)
144 {
145 struct ds1775_softc *sc;
146
147 sc = device_get_softc(dev);
148
149 sc->enum_hook.ich_func = ds1775_start;
150 sc->enum_hook.ich_arg = dev;
151
152 /* We have to wait until interrupts are enabled. I2C read and write
153 * only works if the interrupts are available.
154 * The unin/i2c is controlled by the htpic on unin. But this is not
155 * the master. The openpic on mac-io is controlling the htpic.
156 * This one gets attached after the mac-io probing and then the
157 * interrupts will be available.
158 */
159
160 if (config_intrhook_establish(&sc->enum_hook) != 0)
161 return (ENOMEM);
162
163 return (0);
164 }
165
166 static void
ds1775_start(void * xdev)167 ds1775_start(void *xdev)
168 {
169 phandle_t child;
170 struct ds1775_softc *sc;
171 struct sysctl_oid *oid, *sensroot_oid;
172 struct sysctl_ctx_list *ctx;
173 ssize_t plen;
174 int i;
175 char sysctl_name[40], sysctl_desc[40];
176
177 device_t dev = (device_t)xdev;
178
179 sc = device_get_softc(dev);
180
181 child = ofw_bus_get_node(dev);
182
183 ctx = device_get_sysctl_ctx(dev);
184 sensroot_oid = SYSCTL_ADD_NODE(ctx,
185 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO, "sensor",
186 CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "DS1775 Sensor Information");
187
188 if (OF_getprop(child, "hwsensor-zone", &sc->sc_sensor.zone,
189 sizeof(int)) < 0)
190 sc->sc_sensor.zone = 0;
191
192 plen = OF_getprop(child, "hwsensor-location", sc->sc_sensor.name,
193 sizeof(sc->sc_sensor.name));
194
195 if (plen == -1) {
196 strcpy(sysctl_name, "sensor");
197 } else {
198 for (i = 0; i < strlen(sc->sc_sensor.name); i++) {
199 sysctl_name[i] = tolower(sc->sc_sensor.name[i]);
200 if (isspace(sysctl_name[i]))
201 sysctl_name[i] = '_';
202 }
203 sysctl_name[i] = 0;
204 }
205
206 /* Make up target temperatures. These are low, for the drive bay. */
207 if (sc->sc_sensor.zone == 0) {
208 sc->sc_sensor.target_temp = 500 + ZERO_C_TO_K;
209 sc->sc_sensor.max_temp = 600 + ZERO_C_TO_K;
210 }
211 else {
212 sc->sc_sensor.target_temp = 300 + ZERO_C_TO_K;
213 sc->sc_sensor.max_temp = 600 + ZERO_C_TO_K;
214 }
215
216 sc->sc_sensor.read =
217 (int (*)(struct pmac_therm *sc))(ds1775_sensor_read);
218 pmac_thermal_sensor_register(&sc->sc_sensor);
219
220 sprintf(sysctl_desc,"%s %s", sc->sc_sensor.name, "(C)");
221 oid = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(sensroot_oid),
222 OID_AUTO, sysctl_name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
223 "Sensor Information");
224 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "temp",
225 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
226 0, ds1775_sensor_sysctl, "IK", sysctl_desc);
227
228 config_intrhook_disestablish(&sc->enum_hook);
229 }
230
231 static int
ds1775_sensor_read(struct ds1775_softc * sc)232 ds1775_sensor_read(struct ds1775_softc *sc)
233 {
234 uint16_t buf[2];
235 uint16_t read;
236 int err;
237
238 err = ds1775_read_2(sc->sc_dev, sc->sc_addr, DS1775_TEMP, buf);
239 if (err < 0)
240 return (-1);
241
242 read = *((int16_t *)buf);
243
244 /* The default mode of the ADC is 9 bit, the resolution is 0.5 C per
245 bit. The temperature is in tenth kelvin.
246 */
247 return (((int16_t)(read) >> 7) * 5 + ZERO_C_TO_K);
248 }
249
250 static int
ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS)251 ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS)
252 {
253 device_t dev;
254 struct ds1775_softc *sc;
255 int error;
256 int temp;
257
258 dev = arg1;
259 sc = device_get_softc(dev);
260
261 temp = ds1775_sensor_read(sc);
262 if (temp < 0)
263 return (EIO);
264
265 error = sysctl_handle_int(oidp, &temp, 0, req);
266
267 return (error);
268 }
269