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