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/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/reboot.h>
39 #include <sys/rman.h>
40 #include <sys/sysctl.h>
41 #include <sys/limits.h>
42
43 #include <machine/bus.h>
44 #include <machine/md_var.h>
45
46 #include <dev/iicbus/iicbus.h>
47 #include <dev/iicbus/iiconf.h>
48
49 #include <dev/ofw/openfirm.h>
50 #include <dev/ofw/ofw_bus.h>
51 #include <powerpc/powermac/powermac_thermal.h>
52
53 /* Drivebay sensor: LM75/DS1775. */
54 #define DS1775_TEMP 0x0
55
56 /* Regular bus attachment functions */
57 static int ds1775_probe(device_t);
58 static int ds1775_attach(device_t);
59
60 struct ds1775_softc {
61 struct pmac_therm sc_sensor;
62 device_t sc_dev;
63 struct intr_config_hook enum_hook;
64 uint32_t sc_addr;
65 };
66
67 /* Utility functions */
68 static int ds1775_sensor_read(struct ds1775_softc *sc);
69 static int ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS);
70 static void ds1775_start(void *xdev);
71 static int ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg,
72 uint16_t *data);
73
74 static device_method_t ds1775_methods[] = {
75 /* Device interface */
76 DEVMETHOD(device_probe, ds1775_probe),
77 DEVMETHOD(device_attach, ds1775_attach),
78 { 0, 0 },
79 };
80
81 static driver_t ds1775_driver = {
82 "ds1775",
83 ds1775_methods,
84 sizeof(struct ds1775_softc)
85 };
86
87 static devclass_t ds1775_devclass;
88
89 DRIVER_MODULE(ds1775, iicbus, ds1775_driver, ds1775_devclass, 0, 0);
90
91 static int
ds1775_read_2(device_t dev,uint32_t addr,uint8_t reg,uint16_t * data)92 ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg, uint16_t *data)
93 {
94 uint8_t buf[4];
95 int err, try = 0;
96
97 struct iic_msg msg[2] = {
98 { addr, IIC_M_WR | IIC_M_NOSTOP, 1, ® },
99 { addr, IIC_M_RD, 2, buf },
100 };
101
102 for (;;)
103 {
104 err = iicbus_transfer(dev, msg, nitems(msg));
105 if (err != 0)
106 goto retry;
107
108 *data = *((uint16_t*)buf);
109 return (0);
110 retry:
111 if (++try > 5) {
112 device_printf(dev, "iicbus read failed\n");
113 return (-1);
114 }
115 pause("ds1775_read_2", hz);
116 }
117 }
118
119 static int
ds1775_probe(device_t dev)120 ds1775_probe(device_t dev)
121 {
122 const char *name, *compatible;
123 struct ds1775_softc *sc;
124
125 name = ofw_bus_get_name(dev);
126 compatible = ofw_bus_get_compat(dev);
127
128 if (!name)
129 return (ENXIO);
130
131 if (strcmp(name, "temp-monitor") != 0 ||
132 (strcmp(compatible, "ds1775") != 0 &&
133 strcmp(compatible, "lm75") != 0))
134 return (ENXIO);
135
136 sc = device_get_softc(dev);
137 sc->sc_dev = dev;
138 sc->sc_addr = iicbus_get_addr(dev);
139
140 device_set_desc(dev, "Temp-Monitor DS1775");
141
142 return (0);
143 }
144
145 static int
ds1775_attach(device_t dev)146 ds1775_attach(device_t dev)
147 {
148 struct ds1775_softc *sc;
149
150 sc = device_get_softc(dev);
151
152 sc->enum_hook.ich_func = ds1775_start;
153 sc->enum_hook.ich_arg = dev;
154
155 /* We have to wait until interrupts are enabled. I2C read and write
156 * only works if the interrupts are available.
157 * The unin/i2c is controlled by the htpic on unin. But this is not
158 * the master. The openpic on mac-io is controlling the htpic.
159 * This one gets attached after the mac-io probing and then the
160 * interrupts will be available.
161 */
162
163 if (config_intrhook_establish(&sc->enum_hook) != 0)
164 return (ENOMEM);
165
166 return (0);
167 }
168
169 static void
ds1775_start(void * xdev)170 ds1775_start(void *xdev)
171 {
172 phandle_t child;
173 struct ds1775_softc *sc;
174 struct sysctl_oid *oid, *sensroot_oid;
175 struct sysctl_ctx_list *ctx;
176 ssize_t plen;
177 int i;
178 char sysctl_name[40], sysctl_desc[40];
179
180 device_t dev = (device_t)xdev;
181
182 sc = device_get_softc(dev);
183
184 child = ofw_bus_get_node(dev);
185
186 ctx = device_get_sysctl_ctx(dev);
187 sensroot_oid = SYSCTL_ADD_NODE(ctx,
188 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO, "sensor",
189 CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "DS1775 Sensor Information");
190
191 if (OF_getprop(child, "hwsensor-zone", &sc->sc_sensor.zone,
192 sizeof(int)) < 0)
193 sc->sc_sensor.zone = 0;
194
195 plen = OF_getprop(child, "hwsensor-location", sc->sc_sensor.name,
196 sizeof(sc->sc_sensor.name));
197
198 if (plen == -1) {
199 strcpy(sysctl_name, "sensor");
200 } else {
201 for (i = 0; i < strlen(sc->sc_sensor.name); i++) {
202 sysctl_name[i] = tolower(sc->sc_sensor.name[i]);
203 if (isspace(sysctl_name[i]))
204 sysctl_name[i] = '_';
205 }
206 sysctl_name[i] = 0;
207 }
208
209 /* Make up target temperatures. These are low, for the drive bay. */
210 if (sc->sc_sensor.zone == 0) {
211 sc->sc_sensor.target_temp = 500 + ZERO_C_TO_K;
212 sc->sc_sensor.max_temp = 600 + ZERO_C_TO_K;
213 }
214 else {
215 sc->sc_sensor.target_temp = 300 + ZERO_C_TO_K;
216 sc->sc_sensor.max_temp = 600 + ZERO_C_TO_K;
217 }
218
219 sc->sc_sensor.read =
220 (int (*)(struct pmac_therm *sc))(ds1775_sensor_read);
221 pmac_thermal_sensor_register(&sc->sc_sensor);
222
223 sprintf(sysctl_desc,"%s %s", sc->sc_sensor.name, "(C)");
224 oid = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(sensroot_oid),
225 OID_AUTO, sysctl_name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
226 "Sensor Information");
227 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "temp",
228 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
229 0, ds1775_sensor_sysctl, "IK", sysctl_desc);
230
231 config_intrhook_disestablish(&sc->enum_hook);
232 }
233
234 static int
ds1775_sensor_read(struct ds1775_softc * sc)235 ds1775_sensor_read(struct ds1775_softc *sc)
236 {
237 uint16_t buf[2];
238 uint16_t read;
239 int err;
240
241 err = ds1775_read_2(sc->sc_dev, sc->sc_addr, DS1775_TEMP, buf);
242 if (err < 0)
243 return (-1);
244
245 read = *((int16_t *)buf);
246
247 /* The default mode of the ADC is 9 bit, the resolution is 0.5 C per
248 bit. The temperature is in tenth kelvin.
249 */
250 return (((int16_t)(read) >> 7) * 5 + ZERO_C_TO_K);
251 }
252
253 static int
ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS)254 ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS)
255 {
256 device_t dev;
257 struct ds1775_softc *sc;
258 int error;
259 int temp;
260
261 dev = arg1;
262 sc = device_get_softc(dev);
263
264 temp = ds1775_sensor_read(sc);
265 if (temp < 0)
266 return (EIO);
267
268 error = sysctl_handle_int(oidp, &temp, 0, req);
269
270 return (error);
271 }
272