summaryrefslogtreecommitdiff
path: root/sys/dev/i2c/ibmhawk.c
blob: d8360aa3c121c1b45c220c45b78f3c773e1e3981 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
/* $NetBSD: ibmhawk.c,v 1.9 2020/05/15 19:28:09 maxv Exp $ */

/*-
 * Copyright (c) 2011 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Juergen Hannken-Illjes.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/systm.h>
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/bswap.h>

#include <dev/sysmon/sysmonvar.h>
#include <dev/i2c/i2cvar.h>
#include <dev/i2c/ibmhawkreg.h>
#include <dev/i2c/ibmhawkvar.h>

#if !defined(IBMHAWK_DEBUG)	/* Set to 2 for verbose debug. */
#if defined(DEBUG)
#define IBMHAWK_DEBUG	1
#else
#define IBMHAWK_DEBUG	0
#endif
#endif

/*
 * Known sensors.
 */
static struct ibmhawk_sensordesc {
	const char *desc;
	uint32_t units;
	int offset;
} ibmhawk_sensors[] = {
	{ "Ambient temperature", ENVSYS_STEMP,     IBMHAWK_T_AMBIENT   },
	{ "CPU 1 temperature",   ENVSYS_STEMP,     IBMHAWK_T_CPU       },
	{ "CPU 2 temperature",   ENVSYS_STEMP,     IBMHAWK_T_CPU+1     },
	{ "12 Voltage sensor",   ENVSYS_SVOLTS_DC, IBMHAWK_V_VOLTAGE   },
	{ "5 Voltage sensor",    ENVSYS_SVOLTS_DC, IBMHAWK_V_VOLTAGE+1 },
	{ "3.3 Voltage sensor",  ENVSYS_SVOLTS_DC, IBMHAWK_V_VOLTAGE+2 },
	{ "2.5 Voltage sensor",  ENVSYS_SVOLTS_DC, IBMHAWK_V_VOLTAGE+3 },
	{ "1.5 Voltage sensor",  ENVSYS_SVOLTS_DC, IBMHAWK_V_VOLTAGE+4 },
	{ "1.25 Voltage sensor", ENVSYS_SVOLTS_DC, IBMHAWK_V_VOLTAGE+5 },
	{ "VRM 1",               ENVSYS_SVOLTS_DC, IBMHAWK_V_VOLTAGE+6 },
	{ "Fan 1",               ENVSYS_SFANRPM,   IBMHAWK_F_FAN       },
	{ "Fan 2",               ENVSYS_SFANRPM,   IBMHAWK_F_FAN+1     },
	{ "Fan 3",               ENVSYS_SFANRPM,   IBMHAWK_F_FAN+2     },
	{ "Fan 4",               ENVSYS_SFANRPM,   IBMHAWK_F_FAN+3     },
	{ "Fan 5",               ENVSYS_SFANRPM,   IBMHAWK_F_FAN+4     },
	{ "Fan 6",               ENVSYS_SFANRPM,   IBMHAWK_F_FAN+5     },
};
static const int ibmhawk_num_sensors =
    (sizeof(ibmhawk_sensors)/sizeof(ibmhawk_sensors[0]));

static int ibmhawk_match(device_t, cfdata_t, void *);
static void ibmhawk_attach(device_t, device_t, void *);
static int ibmhawk_detach(device_t, int);
static uint8_t ibmhawk_cksum(uint8_t *);
static int ibmhawk_request(struct ibmhawk_softc *,
    uint8_t, ibmhawk_response_t *);
static uint32_t ibmhawk_normalize(int, uint32_t);
static void ibmhawk_set(struct ibmhawk_softc *, int, int, bool, bool);
static void ibmhawk_refreshall(struct ibmhawk_softc *, bool);
static void ibmhawk_refresh(struct sysmon_envsys *, envsys_data_t *);
static void ibmhawk_get_limits(struct sysmon_envsys *, envsys_data_t *,
    sysmon_envsys_lim_t *, uint32_t *);

CFATTACH_DECL_NEW(ibmhawk, sizeof(struct ibmhawk_softc),
    ibmhawk_match, ibmhawk_attach, ibmhawk_detach, NULL);

static int
ibmhawk_match(device_t parent, cfdata_t match, void *aux)
{
	struct i2c_attach_args *ia = aux;
	ibmhawk_response_t resp;
	static struct ibmhawk_softc sc;

	/* There is an expected address for this device: */
	if (ia->ia_addr != 0x37)
		return 0;

	/* XXX Probe is potentially destructive. */

	sc.sc_tag = ia->ia_tag;
	sc.sc_addr = ia->ia_addr;
	if (ibmhawk_request(&sc, IHR_EQUIP, &resp))
		return 0;

	return I2C_MATCH_ADDRESS_AND_PROBE;
}

static void
ibmhawk_attach(device_t parent, device_t self, void *aux)
{
	struct ibmhawk_softc *sc = device_private(self);
	struct i2c_attach_args *ia = aux;
	ibmhawk_response_t resp;
	int i;

	sc->sc_dev = self;
	sc->sc_tag = ia->ia_tag;
	sc->sc_addr = ia->ia_addr;

	if (!pmf_device_register(self, NULL, NULL))
		aprint_error_dev(self, "couldn't establish power handler\n");
	if (ibmhawk_request(sc, IHR_NAME, &resp)) {
		aprint_error_dev(self, "communication failed\n");
		return;
	}
	aprint_normal(": IBM Hawk \"%.16s\"\n", resp.ihr_name);
	if (ibmhawk_request(sc, IHR_EQUIP, &resp)) {
		aprint_error_dev(sc->sc_dev, "equip query failed\n");
		return;
	}
	sc->sc_numcpus = uimin(resp.ihr_numcpus, IBMHAWK_MAX_CPU);
	sc->sc_numfans = uimin(resp.ihr_numfans, IBMHAWK_MAX_FAN);
#if IBMHAWK_DEBUG > 0
	aprint_normal_dev(sc->sc_dev, "monitoring %d/%d cpu(s) %d/%d fan(s)\n",
	    sc->sc_numcpus, resp.ihr_numcpus, sc->sc_numfans, resp.ihr_numfans);
#endif
	/* Request and set sensor thresholds. */
	if (ibmhawk_request(sc, IHR_TEMP_THR, &resp)) {
		aprint_error_dev(sc->sc_dev, "temp threshold query failed\n");
		return;
	}
	for (i = 0; i < sc->sc_numcpus; i++)
		sc->sc_sensordata[IBMHAWK_T_CPU+i].ihs_warnmax =
		    resp.ihr_t_warn_thr;
	if (ibmhawk_request(sc, IHR_VOLT_THR, &resp)) {
		aprint_error_dev(sc->sc_dev, "volt threshold query failed\n");
		return;
	}
	for (i = 0; i < IBMHAWK_MAX_VOLTAGE; i++) {
		sc->sc_sensordata[IBMHAWK_V_VOLTAGE+i].ihs_warnmax =
		    bswap16(resp.ihr_v_voltage_thr[i*2]);
		sc->sc_sensordata[IBMHAWK_V_VOLTAGE+i].ihs_warnmin =
		    bswap16(resp.ihr_v_voltage_thr[i*2+1]);
	}
	if ((sc->sc_sme = sysmon_envsys_create()) == NULL) {
		aprint_error_dev(sc->sc_dev, "sysmon_envsys_create failed\n");
		return;
	}
	ibmhawk_refreshall(sc, true);
	sc->sc_sme->sme_name = device_xname(sc->sc_dev);
	sc->sc_sme->sme_cookie = sc;
	sc->sc_sme->sme_refresh = ibmhawk_refresh;
	sc->sc_sme->sme_get_limits = ibmhawk_get_limits;
	if (sysmon_envsys_register(sc->sc_sme)) {
		aprint_error_dev(sc->sc_dev, "sysmon_envsys_register failed\n");
		sysmon_envsys_destroy(sc->sc_sme);
		sc->sc_sme = NULL;
		return;
	}
}

static int
ibmhawk_detach(device_t self, int flags)
{
	struct ibmhawk_softc *sc = device_private(self);

	if (sc->sc_sme)
		sysmon_envsys_destroy(sc->sc_sme);
	return 0;
}


/*
 * Compute the message checksum.
 */
static uint8_t
ibmhawk_cksum(uint8_t *buf)
{
	int len = *buf++;
	int s = 0;

	while (--len > 0)
		s += *buf++;
	return -s;
}

/*
 * Request information from the management processor.
 * The response will be zeroed on error.
 * Request and response have the form <n> <data 0:n-2> <checksum>.
 */
static int
ibmhawk_request(struct ibmhawk_softc *sc, uint8_t request,
    ibmhawk_response_t *response)
{
	int i, error, retries;
	uint8_t buf[sizeof(ibmhawk_response_t)+3], dummy;

	error = EIO;	/* Fail until we have a valid response. */
	retries = 0;

	if (iic_acquire_bus(sc->sc_tag, 0))
		return error;

again:
	memset(response, 0, sizeof(*response));

	/* Build and send the request. */
	buf[0] = 2;
	buf[1] = request;
	buf[2] = ibmhawk_cksum(buf);
#if IBMHAWK_DEBUG > 1
	printf("[");
	for (i = 0; i < 3; i++)
		printf(" %02x", buf[i]);
	printf(" ]");
#endif
	for (i = 0; i < 3; i++)
		if (iic_smbus_send_byte(sc->sc_tag, sc->sc_addr, buf[i], 0))
			goto bad;

	/* Receive and check the response. */
#if IBMHAWK_DEBUG > 1
	printf(" => [");
#endif
	if (iic_smbus_receive_byte(sc->sc_tag, sc->sc_addr, &buf[0], 0))
		goto bad;
	if (buf[0] == 0 || buf[0] == 255)
		goto bad;
	for (i = 1; i < buf[0]+1; i++)
		if (iic_smbus_receive_byte(sc->sc_tag, sc->sc_addr,
		    (i < sizeof buf ? &buf[i] : &dummy), 0))
			goto bad;
	if (buf[0] >= sizeof(buf) || buf[1] != request ||
	    ibmhawk_cksum(buf) != buf[buf[0]])
		goto bad;
	if (buf[0] > 2)
		memcpy(response, buf+2, buf[0]-2);
	error = 0;

bad:
#if IBMHAWK_DEBUG > 1
	for (i = 0; i < uimin(buf[0]+1, sizeof buf); i++)
		printf(" %02x", buf[i]);
	printf(" ] => %d\n", error);
#endif
	if (error != 0 && retries++ < 3)
		goto again;

	iic_release_bus(sc->sc_tag, 0);
	return error;
}

static uint32_t
ibmhawk_normalize(int value, uint32_t units)
{

	if (value == 0)
		return 0;

	switch (units) {
	case ENVSYS_STEMP:
		return 273150000+1000000*value;
	case ENVSYS_SVOLTS_DC:
		return 10000*value;
	default:
		return value;
	}
}

static void
ibmhawk_set(struct ibmhawk_softc *sc,
    int offset, int value, bool valid, bool create)
{
	int i;
	struct ibmhawk_sensordesc *sp;
	struct ibmhawk_sensordata *sd;
	envsys_data_t *dp;

	sd = &sc->sc_sensordata[offset];
	dp = &sd->ihs_edata;
	sp = NULL;
	if (create) {
		for (i = 0; i < ibmhawk_num_sensors; i++)
			if (ibmhawk_sensors[i].offset == offset) {
				sp = ibmhawk_sensors+i;
				break;
			}
		if (sp == NULL) {
#if IBMHAWK_DEBUG > 0
			aprint_error_dev(sc->sc_dev,
			    "offset %d: no sensor found\n", offset);
#endif
			return;
		}
		strlcpy(dp->desc, sp->desc, sizeof(dp->desc));
		dp->units = sp->units;
		if (sd->ihs_warnmin != 0 || sd->ihs_warnmax != 0) {
			sd->ihs_warnmin =
			    ibmhawk_normalize(sd->ihs_warnmin, dp->units);
			sd->ihs_warnmax =
			    ibmhawk_normalize(sd->ihs_warnmax, dp->units);
			dp->flags |= ENVSYS_FMONLIMITS;
		}
	}

	if (valid) {
		dp->value_cur = ibmhawk_normalize(value, dp->units);
		dp->state = ENVSYS_SVALID;
	} else
		dp->state = ENVSYS_SINVALID;

	if (create) {
		if (sysmon_envsys_sensor_attach(sc->sc_sme, dp))
			aprint_error_dev(sc->sc_dev,
			    "failed to attach \"%s\"\n", dp->desc);
	}
}

static void
ibmhawk_refreshall(struct ibmhawk_softc *sc, bool create)
{
	int i;
	bool valid;
	ibmhawk_response_t resp;

	valid = (ibmhawk_request(sc, IHR_TEMP, &resp) == 0);
	ibmhawk_set(sc, IBMHAWK_T_AMBIENT, resp.ihr_t_ambient, valid, create);
	for (i = 0; i < sc->sc_numcpus; i++)
		ibmhawk_set(sc, IBMHAWK_T_CPU+i,
		    resp.ihr_t_cpu[i], valid, create);

	valid = (ibmhawk_request(sc, IHR_FANRPM, &resp) == 0);
	for (i = 0; i < sc->sc_numfans; i++)
		ibmhawk_set(sc, IBMHAWK_F_FAN+i,
		    bswap16(resp.ihr_fanrpm[i]), valid, create);

	valid = (ibmhawk_request(sc, IHR_VOLT, &resp) == 0);
	for (i = 0; i < IBMHAWK_MAX_VOLTAGE; i++)
		ibmhawk_set(sc, IBMHAWK_V_VOLTAGE+i,
		    bswap16(resp.ihr_v_voltage[i]), valid, create);
}

static void
ibmhawk_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
{
	struct ibmhawk_softc *sc = sme->sme_cookie;

	/* No more than two refreshes per second. */
	if (getticks() - sc->sc_refresh < hz/2)
		return;
#if IBMHAWK_DEBUG > 1
	aprint_normal_dev(sc->sc_dev, "refresh \"%s\" delta %d\n",
	    edata->desc, getticks() - sc->sc_refresh);
#endif
	sc->sc_refresh = getticks();
	ibmhawk_refreshall(sc, false);
}

static void
ibmhawk_get_limits(struct sysmon_envsys *sme, envsys_data_t *edata,
    sysmon_envsys_lim_t *limits, uint32_t *props)
{
	struct ibmhawk_sensordata *sd = (struct ibmhawk_sensordata *)edata;

	if (sd->ihs_warnmin != 0) {
		limits->sel_warnmin = sd->ihs_warnmin;
		*props |= PROP_WARNMIN;
	}
	if (sd->ihs_warnmax != 0) {
		limits->sel_warnmax = sd->ihs_warnmax;
		*props |= PROP_WARNMAX;
	}
}