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1/* fschmd.c
2 *
3 * Copyright (C) 2007 - 2009 Hans de Goede <hdegoede@redhat.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19
20/*
21 * Merged Fujitsu Siemens hwmon driver, supporting the Poseidon, Hermes,
22 * Scylla, Heracles, Heimdall, Hades and Syleus chips
23 *
24 * Based on the original 2.4 fscscy, 2.6 fscpos, 2.6 fscher and 2.6
25 * (candidate) fschmd drivers:
26 * Copyright (C) 2006 Thilo Cestonaro
27 * <thilo.cestonaro.external@fujitsu-siemens.com>
28 * Copyright (C) 2004, 2005 Stefan Ott <stefan@desire.ch>
29 * Copyright (C) 2003, 2004 Reinhard Nissl <rnissl@gmx.de>
30 * Copyright (c) 2001 Martin Knoblauch <mkn@teraport.de, knobi@knobisoft.de>
31 * Copyright (C) 2000 Hermann Jung <hej@odn.de>
32 */
33
34#include <linux/module.h>
35#include <linux/init.h>
36#include <linux/slab.h>
37#include <linux/jiffies.h>
38#include <linux/i2c.h>
39#include <linux/hwmon.h>
40#include <linux/hwmon-sysfs.h>
41#include <linux/err.h>
42#include <linux/mutex.h>
43#include <linux/sysfs.h>
44#include <linux/dmi.h>
45#include <linux/fs.h>
46#include <linux/watchdog.h>
47#include <linux/miscdevice.h>
48#include <linux/uaccess.h>
49#include <linux/kref.h>
50
51/* Addresses to scan */
52static const unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };
53
54/* Insmod parameters */
55static int nowayout = WATCHDOG_NOWAYOUT;
56module_param(nowayout, int, 0);
57MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
58 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
59
60enum chips { fscpos, fscher, fscscy, fschrc, fschmd, fschds, fscsyl };
61
62/*
63 * The FSCHMD registers and other defines
64 */
65
66/* chip identification */
67#define FSCHMD_REG_IDENT_0 0x00
68#define FSCHMD_REG_IDENT_1 0x01
69#define FSCHMD_REG_IDENT_2 0x02
70#define FSCHMD_REG_REVISION 0x03
71
72/* global control and status */
73#define FSCHMD_REG_EVENT_STATE 0x04
74#define FSCHMD_REG_CONTROL 0x05
75
76#define FSCHMD_CONTROL_ALERT_LED 0x01
77
78/* watchdog */
79static const u8 FSCHMD_REG_WDOG_CONTROL[7] =
80 { 0x21, 0x21, 0x21, 0x21, 0x21, 0x28, 0x28 };
81static const u8 FSCHMD_REG_WDOG_STATE[7] =
82 { 0x23, 0x23, 0x23, 0x23, 0x23, 0x29, 0x29 };
83static const u8 FSCHMD_REG_WDOG_PRESET[7] =
84 { 0x28, 0x28, 0x28, 0x28, 0x28, 0x2a, 0x2a };
85
86#define FSCHMD_WDOG_CONTROL_TRIGGER 0x10
87#define FSCHMD_WDOG_CONTROL_STARTED 0x10 /* the same as trigger */
88#define FSCHMD_WDOG_CONTROL_STOP 0x20
89#define FSCHMD_WDOG_CONTROL_RESOLUTION 0x40
90
91#define FSCHMD_WDOG_STATE_CARDRESET 0x02
92
93/* voltages, weird order is to keep the same order as the old drivers */
94static const u8 FSCHMD_REG_VOLT[7][6] = {
95 { 0x45, 0x42, 0x48 }, /* pos */
96 { 0x45, 0x42, 0x48 }, /* her */
97 { 0x45, 0x42, 0x48 }, /* scy */
98 { 0x45, 0x42, 0x48 }, /* hrc */
99 { 0x45, 0x42, 0x48 }, /* hmd */
100 { 0x21, 0x20, 0x22 }, /* hds */
101 { 0x21, 0x20, 0x22, 0x23, 0x24, 0x25 }, /* syl */
102};
103
104static const int FSCHMD_NO_VOLT_SENSORS[7] = { 3, 3, 3, 3, 3, 3, 6 };
105
106/* minimum pwm at which the fan is driven (pwm can by increased depending on
107 the temp. Notice that for the scy some fans share there minimum speed.
108 Also notice that with the scy the sensor order is different than with the
109 other chips, this order was in the 2.4 driver and kept for consistency. */
110static const u8 FSCHMD_REG_FAN_MIN[7][7] = {
111 { 0x55, 0x65 }, /* pos */
112 { 0x55, 0x65, 0xb5 }, /* her */
113 { 0x65, 0x65, 0x55, 0xa5, 0x55, 0xa5 }, /* scy */
114 { 0x55, 0x65, 0xa5, 0xb5 }, /* hrc */
115 { 0x55, 0x65, 0xa5, 0xb5, 0xc5 }, /* hmd */
116 { 0x55, 0x65, 0xa5, 0xb5, 0xc5 }, /* hds */
117 { 0x54, 0x64, 0x74, 0x84, 0x94, 0xa4, 0xb4 }, /* syl */
118};
119
120/* actual fan speed */
121static const u8 FSCHMD_REG_FAN_ACT[7][7] = {
122 { 0x0e, 0x6b, 0xab }, /* pos */
123 { 0x0e, 0x6b, 0xbb }, /* her */
124 { 0x6b, 0x6c, 0x0e, 0xab, 0x5c, 0xbb }, /* scy */
125 { 0x0e, 0x6b, 0xab, 0xbb }, /* hrc */
126 { 0x5b, 0x6b, 0xab, 0xbb, 0xcb }, /* hmd */
127 { 0x5b, 0x6b, 0xab, 0xbb, 0xcb }, /* hds */
128 { 0x57, 0x67, 0x77, 0x87, 0x97, 0xa7, 0xb7 }, /* syl */
129};
130
131/* fan status registers */
132static const u8 FSCHMD_REG_FAN_STATE[7][7] = {
133 { 0x0d, 0x62, 0xa2 }, /* pos */
134 { 0x0d, 0x62, 0xb2 }, /* her */
135 { 0x62, 0x61, 0x0d, 0xa2, 0x52, 0xb2 }, /* scy */
136 { 0x0d, 0x62, 0xa2, 0xb2 }, /* hrc */
137 { 0x52, 0x62, 0xa2, 0xb2, 0xc2 }, /* hmd */
138 { 0x52, 0x62, 0xa2, 0xb2, 0xc2 }, /* hds */
139 { 0x50, 0x60, 0x70, 0x80, 0x90, 0xa0, 0xb0 }, /* syl */
140};
141
142/* fan ripple / divider registers */
143static const u8 FSCHMD_REG_FAN_RIPPLE[7][7] = {
144 { 0x0f, 0x6f, 0xaf }, /* pos */
145 { 0x0f, 0x6f, 0xbf }, /* her */
146 { 0x6f, 0x6f, 0x0f, 0xaf, 0x0f, 0xbf }, /* scy */
147 { 0x0f, 0x6f, 0xaf, 0xbf }, /* hrc */
148 { 0x5f, 0x6f, 0xaf, 0xbf, 0xcf }, /* hmd */
149 { 0x5f, 0x6f, 0xaf, 0xbf, 0xcf }, /* hds */
150 { 0x56, 0x66, 0x76, 0x86, 0x96, 0xa6, 0xb6 }, /* syl */
151};
152
153static const int FSCHMD_NO_FAN_SENSORS[7] = { 3, 3, 6, 4, 5, 5, 7 };
154
155/* Fan status register bitmasks */
156#define FSCHMD_FAN_ALARM 0x04 /* called fault by FSC! */
157#define FSCHMD_FAN_NOT_PRESENT 0x08
158#define FSCHMD_FAN_DISABLED 0x80
159
160
161/* actual temperature registers */
162static const u8 FSCHMD_REG_TEMP_ACT[7][11] = {
163 { 0x64, 0x32, 0x35 }, /* pos */
164 { 0x64, 0x32, 0x35 }, /* her */
165 { 0x64, 0xD0, 0x32, 0x35 }, /* scy */
166 { 0x64, 0x32, 0x35 }, /* hrc */
167 { 0x70, 0x80, 0x90, 0xd0, 0xe0 }, /* hmd */
168 { 0x70, 0x80, 0x90, 0xd0, 0xe0 }, /* hds */
169 { 0x58, 0x68, 0x78, 0x88, 0x98, 0xa8, /* syl */
170 0xb8, 0xc8, 0xd8, 0xe8, 0xf8 },
171};
172
173/* temperature state registers */
174static const u8 FSCHMD_REG_TEMP_STATE[7][11] = {
175 { 0x71, 0x81, 0x91 }, /* pos */
176 { 0x71, 0x81, 0x91 }, /* her */
177 { 0x71, 0xd1, 0x81, 0x91 }, /* scy */
178 { 0x71, 0x81, 0x91 }, /* hrc */
179 { 0x71, 0x81, 0x91, 0xd1, 0xe1 }, /* hmd */
180 { 0x71, 0x81, 0x91, 0xd1, 0xe1 }, /* hds */
181 { 0x59, 0x69, 0x79, 0x89, 0x99, 0xa9, /* syl */
182 0xb9, 0xc9, 0xd9, 0xe9, 0xf9 },
183};
184
185/* temperature high limit registers, FSC does not document these. Proven to be
186 there with field testing on the fscher and fschrc, already supported / used
187 in the fscscy 2.4 driver. FSC has confirmed that the fschmd has registers
188 at these addresses, but doesn't want to confirm they are the same as with
189 the fscher?? */
190static const u8 FSCHMD_REG_TEMP_LIMIT[7][11] = {
191 { 0, 0, 0 }, /* pos */
192 { 0x76, 0x86, 0x96 }, /* her */
193 { 0x76, 0xd6, 0x86, 0x96 }, /* scy */
194 { 0x76, 0x86, 0x96 }, /* hrc */
195 { 0x76, 0x86, 0x96, 0xd6, 0xe6 }, /* hmd */
196 { 0x76, 0x86, 0x96, 0xd6, 0xe6 }, /* hds */
197 { 0x5a, 0x6a, 0x7a, 0x8a, 0x9a, 0xaa, /* syl */
198 0xba, 0xca, 0xda, 0xea, 0xfa },
199};
200
201/* These were found through experimenting with an fscher, currently they are
202 not used, but we keep them around for future reference.
203 On the fscsyl AUTOP1 lives at 0x#c (so 0x5c for fan1, 0x6c for fan2, etc),
204 AUTOP2 lives at 0x#e, and 0x#1 is a bitmask defining which temps influence
205 the fan speed.
206static const u8 FSCHER_REG_TEMP_AUTOP1[] = { 0x73, 0x83, 0x93 };
207static const u8 FSCHER_REG_TEMP_AUTOP2[] = { 0x75, 0x85, 0x95 }; */
208
209static const int FSCHMD_NO_TEMP_SENSORS[7] = { 3, 3, 4, 3, 5, 5, 11 };
210
211/* temp status register bitmasks */
212#define FSCHMD_TEMP_WORKING 0x01
213#define FSCHMD_TEMP_ALERT 0x02
214#define FSCHMD_TEMP_DISABLED 0x80
215/* there only really is an alarm if the sensor is working and alert == 1 */
216#define FSCHMD_TEMP_ALARM_MASK \
217 (FSCHMD_TEMP_WORKING | FSCHMD_TEMP_ALERT)
218
219/*
220 * Functions declarations
221 */
222
223static int fschmd_probe(struct i2c_client *client,
224 const struct i2c_device_id *id);
225static int fschmd_detect(struct i2c_client *client,
226 struct i2c_board_info *info);
227static int fschmd_remove(struct i2c_client *client);
228static struct fschmd_data *fschmd_update_device(struct device *dev);
229
230/*
231 * Driver data (common to all clients)
232 */
233
234static const struct i2c_device_id fschmd_id[] = {
235 { "fscpos", fscpos },
236 { "fscher", fscher },
237 { "fscscy", fscscy },
238 { "fschrc", fschrc },
239 { "fschmd", fschmd },
240 { "fschds", fschds },
241 { "fscsyl", fscsyl },
242 { }
243};
244MODULE_DEVICE_TABLE(i2c, fschmd_id);
245
246static struct i2c_driver fschmd_driver = {
247 .class = I2C_CLASS_HWMON,
248 .driver = {
249 .name = "fschmd",
250 },
251 .probe = fschmd_probe,
252 .remove = fschmd_remove,
253 .id_table = fschmd_id,
254 .detect = fschmd_detect,
255 .address_list = normal_i2c,
256};
257
258/*
259 * Client data (each client gets its own)
260 */
261
262struct fschmd_data {
263 struct i2c_client *client;
264 struct device *hwmon_dev;
265 struct mutex update_lock;
266 struct mutex watchdog_lock;
267 struct list_head list; /* member of the watchdog_data_list */
268 struct kref kref;
269 struct miscdevice watchdog_miscdev;
270 enum chips kind;
271 unsigned long watchdog_is_open;
272 char watchdog_expect_close;
273 char watchdog_name[10]; /* must be unique to avoid sysfs conflict */
274 char valid; /* zero until following fields are valid */
275 unsigned long last_updated; /* in jiffies */
276
277 /* register values */
278 u8 revision; /* chip revision */
279 u8 global_control; /* global control register */
280 u8 watchdog_control; /* watchdog control register */
281 u8 watchdog_state; /* watchdog status register */
282 u8 watchdog_preset; /* watchdog counter preset on trigger val */
283 u8 volt[6]; /* voltage */
284 u8 temp_act[11]; /* temperature */
285 u8 temp_status[11]; /* status of sensor */
286 u8 temp_max[11]; /* high temp limit, notice: undocumented! */
287 u8 fan_act[7]; /* fans revolutions per second */
288 u8 fan_status[7]; /* fan status */
289 u8 fan_min[7]; /* fan min value for rps */
290 u8 fan_ripple[7]; /* divider for rps */
291};
292
293/* Global variables to hold information read from special DMI tables, which are
294 available on FSC machines with an fscher or later chip. There is no need to
295 protect these with a lock as they are only modified from our attach function
296 which always gets called with the i2c-core lock held and never accessed
297 before the attach function is done with them. */
298static int dmi_mult[6] = { 490, 200, 100, 100, 200, 100 };
299static int dmi_offset[6] = { 0, 0, 0, 0, 0, 0 };
300static int dmi_vref = -1;
301
302/* Somewhat ugly :( global data pointer list with all fschmd devices, so that
303 we can find our device data as when using misc_register there is no other
304 method to get to ones device data from the open fop. */
305static LIST_HEAD(watchdog_data_list);
306/* Note this lock not only protect list access, but also data.kref access */
307static DEFINE_MUTEX(watchdog_data_mutex);
308
309/* Release our data struct when we're detached from the i2c client *and* all
310 references to our watchdog device are released */
311static void fschmd_release_resources(struct kref *ref)
312{
313 struct fschmd_data *data = container_of(ref, struct fschmd_data, kref);
314 kfree(data);
315}
316
317/*
318 * Sysfs attr show / store functions
319 */
320
321static ssize_t show_in_value(struct device *dev,
322 struct device_attribute *devattr, char *buf)
323{
324 const int max_reading[3] = { 14200, 6600, 3300 };
325 int index = to_sensor_dev_attr(devattr)->index;
326 struct fschmd_data *data = fschmd_update_device(dev);
327
328 if (data->kind == fscher || data->kind >= fschrc)
329 return sprintf(buf, "%d\n", (data->volt[index] * dmi_vref *
330 dmi_mult[index]) / 255 + dmi_offset[index]);
331 else
332 return sprintf(buf, "%d\n", (data->volt[index] *
333 max_reading[index] + 128) / 255);
334}
335
336
337#define TEMP_FROM_REG(val) (((val) - 128) * 1000)
338
339static ssize_t show_temp_value(struct device *dev,
340 struct device_attribute *devattr, char *buf)
341{
342 int index = to_sensor_dev_attr(devattr)->index;
343 struct fschmd_data *data = fschmd_update_device(dev);
344
345 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_act[index]));
346}
347
348static ssize_t show_temp_max(struct device *dev,
349 struct device_attribute *devattr, char *buf)
350{
351 int index = to_sensor_dev_attr(devattr)->index;
352 struct fschmd_data *data = fschmd_update_device(dev);
353
354 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[index]));
355}
356
357static ssize_t store_temp_max(struct device *dev, struct device_attribute
358 *devattr, const char *buf, size_t count)
359{
360 int index = to_sensor_dev_attr(devattr)->index;
361 struct fschmd_data *data = dev_get_drvdata(dev);
362 long v = simple_strtol(buf, NULL, 10) / 1000;
363
364 v = SENSORS_LIMIT(v, -128, 127) + 128;
365
366 mutex_lock(&data->update_lock);
367 i2c_smbus_write_byte_data(to_i2c_client(dev),
368 FSCHMD_REG_TEMP_LIMIT[data->kind][index], v);
369 data->temp_max[index] = v;
370 mutex_unlock(&data->update_lock);
371
372 return count;
373}
374
375static ssize_t show_temp_fault(struct device *dev,
376 struct device_attribute *devattr, char *buf)
377{
378 int index = to_sensor_dev_attr(devattr)->index;
379 struct fschmd_data *data = fschmd_update_device(dev);
380
381 /* bit 0 set means sensor working ok, so no fault! */
382 if (data->temp_status[index] & FSCHMD_TEMP_WORKING)
383 return sprintf(buf, "0\n");
384 else
385 return sprintf(buf, "1\n");
386}
387
388static ssize_t show_temp_alarm(struct device *dev,
389 struct device_attribute *devattr, char *buf)
390{
391 int index = to_sensor_dev_attr(devattr)->index;
392 struct fschmd_data *data = fschmd_update_device(dev);
393
394 if ((data->temp_status[index] & FSCHMD_TEMP_ALARM_MASK) ==
395 FSCHMD_TEMP_ALARM_MASK)
396 return sprintf(buf, "1\n");
397 else
398 return sprintf(buf, "0\n");
399}
400
401
402#define RPM_FROM_REG(val) ((val) * 60)
403
404static ssize_t show_fan_value(struct device *dev,
405 struct device_attribute *devattr, char *buf)
406{
407 int index = to_sensor_dev_attr(devattr)->index;
408 struct fschmd_data *data = fschmd_update_device(dev);
409
410 return sprintf(buf, "%u\n", RPM_FROM_REG(data->fan_act[index]));
411}
412
413static ssize_t show_fan_div(struct device *dev,
414 struct device_attribute *devattr, char *buf)
415{
416 int index = to_sensor_dev_attr(devattr)->index;
417 struct fschmd_data *data = fschmd_update_device(dev);
418
419 /* bits 2..7 reserved => mask with 3 */
420 return sprintf(buf, "%d\n", 1 << (data->fan_ripple[index] & 3));
421}
422
423static ssize_t store_fan_div(struct device *dev, struct device_attribute
424 *devattr, const char *buf, size_t count)
425{
426 u8 reg;
427 int index = to_sensor_dev_attr(devattr)->index;
428 struct fschmd_data *data = dev_get_drvdata(dev);
429 /* supported values: 2, 4, 8 */
430 unsigned long v = simple_strtoul(buf, NULL, 10);
431
432 switch (v) {
433 case 2: v = 1; break;
434 case 4: v = 2; break;
435 case 8: v = 3; break;
436 default:
437 dev_err(dev, "fan_div value %lu not supported. "
438 "Choose one of 2, 4 or 8!\n", v);
439 return -EINVAL;
440 }
441
442 mutex_lock(&data->update_lock);
443
444 reg = i2c_smbus_read_byte_data(to_i2c_client(dev),
445 FSCHMD_REG_FAN_RIPPLE[data->kind][index]);
446
447 /* bits 2..7 reserved => mask with 0x03 */
448 reg &= ~0x03;
449 reg |= v;
450
451 i2c_smbus_write_byte_data(to_i2c_client(dev),
452 FSCHMD_REG_FAN_RIPPLE[data->kind][index], reg);
453
454 data->fan_ripple[index] = reg;
455
456 mutex_unlock(&data->update_lock);
457
458 return count;
459}
460
461static ssize_t show_fan_alarm(struct device *dev,
462 struct device_attribute *devattr, char *buf)
463{
464 int index = to_sensor_dev_attr(devattr)->index;
465 struct fschmd_data *data = fschmd_update_device(dev);
466
467 if (data->fan_status[index] & FSCHMD_FAN_ALARM)
468 return sprintf(buf, "1\n");
469 else
470 return sprintf(buf, "0\n");
471}
472
473static ssize_t show_fan_fault(struct device *dev,
474 struct device_attribute *devattr, char *buf)
475{
476 int index = to_sensor_dev_attr(devattr)->index;
477 struct fschmd_data *data = fschmd_update_device(dev);
478
479 if (data->fan_status[index] & FSCHMD_FAN_NOT_PRESENT)
480 return sprintf(buf, "1\n");
481 else
482 return sprintf(buf, "0\n");
483}
484
485
486static ssize_t show_pwm_auto_point1_pwm(struct device *dev,
487 struct device_attribute *devattr, char *buf)
488{
489 int index = to_sensor_dev_attr(devattr)->index;
490 struct fschmd_data *data = fschmd_update_device(dev);
491 int val = data->fan_min[index];
492
493 /* 0 = allow turning off (except on the syl), 1-255 = 50-100% */
494 if (val || data->kind == fscsyl)
495 val = val / 2 + 128;
496
497 return sprintf(buf, "%d\n", val);
498}
499
500static ssize_t store_pwm_auto_point1_pwm(struct device *dev,
501 struct device_attribute *devattr, const char *buf, size_t count)
502{
503 int index = to_sensor_dev_attr(devattr)->index;
504 struct fschmd_data *data = dev_get_drvdata(dev);
505 unsigned long v = simple_strtoul(buf, NULL, 10);
506
507 /* reg: 0 = allow turning off (except on the syl), 1-255 = 50-100% */
508 if (v || data->kind == fscsyl) {
509 v = SENSORS_LIMIT(v, 128, 255);
510 v = (v - 128) * 2 + 1;
511 }
512
513 mutex_lock(&data->update_lock);
514
515 i2c_smbus_write_byte_data(to_i2c_client(dev),
516 FSCHMD_REG_FAN_MIN[data->kind][index], v);
517 data->fan_min[index] = v;
518
519 mutex_unlock(&data->update_lock);
520
521 return count;
522}
523
524
525/* The FSC hwmon family has the ability to force an attached alert led to flash
526 from software, we export this as an alert_led sysfs attr */
527static ssize_t show_alert_led(struct device *dev,
528 struct device_attribute *devattr, char *buf)
529{
530 struct fschmd_data *data = fschmd_update_device(dev);
531
532 if (data->global_control & FSCHMD_CONTROL_ALERT_LED)
533 return sprintf(buf, "1\n");
534 else
535 return sprintf(buf, "0\n");
536}
537
538static ssize_t store_alert_led(struct device *dev,
539 struct device_attribute *devattr, const char *buf, size_t count)
540{
541 u8 reg;
542 struct fschmd_data *data = dev_get_drvdata(dev);
543 unsigned long v = simple_strtoul(buf, NULL, 10);
544
545 mutex_lock(&data->update_lock);
546
547 reg = i2c_smbus_read_byte_data(to_i2c_client(dev), FSCHMD_REG_CONTROL);
548
549 if (v)
550 reg |= FSCHMD_CONTROL_ALERT_LED;
551 else
552 reg &= ~FSCHMD_CONTROL_ALERT_LED;
553
554 i2c_smbus_write_byte_data(to_i2c_client(dev), FSCHMD_REG_CONTROL, reg);
555
556 data->global_control = reg;
557
558 mutex_unlock(&data->update_lock);
559
560 return count;
561}
562
563static DEVICE_ATTR(alert_led, 0644, show_alert_led, store_alert_led);
564
565static struct sensor_device_attribute fschmd_attr[] = {
566 SENSOR_ATTR(in0_input, 0444, show_in_value, NULL, 0),
567 SENSOR_ATTR(in1_input, 0444, show_in_value, NULL, 1),
568 SENSOR_ATTR(in2_input, 0444, show_in_value, NULL, 2),
569 SENSOR_ATTR(in3_input, 0444, show_in_value, NULL, 3),
570 SENSOR_ATTR(in4_input, 0444, show_in_value, NULL, 4),
571 SENSOR_ATTR(in5_input, 0444, show_in_value, NULL, 5),
572};
573
574static struct sensor_device_attribute fschmd_temp_attr[] = {
575 SENSOR_ATTR(temp1_input, 0444, show_temp_value, NULL, 0),
576 SENSOR_ATTR(temp1_max, 0644, show_temp_max, store_temp_max, 0),
577 SENSOR_ATTR(temp1_fault, 0444, show_temp_fault, NULL, 0),
578 SENSOR_ATTR(temp1_alarm, 0444, show_temp_alarm, NULL, 0),
579 SENSOR_ATTR(temp2_input, 0444, show_temp_value, NULL, 1),
580 SENSOR_ATTR(temp2_max, 0644, show_temp_max, store_temp_max, 1),
581 SENSOR_ATTR(temp2_fault, 0444, show_temp_fault, NULL, 1),
582 SENSOR_ATTR(temp2_alarm, 0444, show_temp_alarm, NULL, 1),
583 SENSOR_ATTR(temp3_input, 0444, show_temp_value, NULL, 2),
584 SENSOR_ATTR(temp3_max, 0644, show_temp_max, store_temp_max, 2),
585 SENSOR_ATTR(temp3_fault, 0444, show_temp_fault, NULL, 2),
586 SENSOR_ATTR(temp3_alarm, 0444, show_temp_alarm, NULL, 2),
587 SENSOR_ATTR(temp4_input, 0444, show_temp_value, NULL, 3),
588 SENSOR_ATTR(temp4_max, 0644, show_temp_max, store_temp_max, 3),
589 SENSOR_ATTR(temp4_fault, 0444, show_temp_fault, NULL, 3),
590 SENSOR_ATTR(temp4_alarm, 0444, show_temp_alarm, NULL, 3),
591 SENSOR_ATTR(temp5_input, 0444, show_temp_value, NULL, 4),
592 SENSOR_ATTR(temp5_max, 0644, show_temp_max, store_temp_max, 4),
593 SENSOR_ATTR(temp5_fault, 0444, show_temp_fault, NULL, 4),
594 SENSOR_ATTR(temp5_alarm, 0444, show_temp_alarm, NULL, 4),
595 SENSOR_ATTR(temp6_input, 0444, show_temp_value, NULL, 5),
596 SENSOR_ATTR(temp6_max, 0644, show_temp_max, store_temp_max, 5),
597 SENSOR_ATTR(temp6_fault, 0444, show_temp_fault, NULL, 5),
598 SENSOR_ATTR(temp6_alarm, 0444, show_temp_alarm, NULL, 5),
599 SENSOR_ATTR(temp7_input, 0444, show_temp_value, NULL, 6),
600 SENSOR_ATTR(temp7_max, 0644, show_temp_max, store_temp_max, 6),
601 SENSOR_ATTR(temp7_fault, 0444, show_temp_fault, NULL, 6),
602 SENSOR_ATTR(temp7_alarm, 0444, show_temp_alarm, NULL, 6),
603 SENSOR_ATTR(temp8_input, 0444, show_temp_value, NULL, 7),
604 SENSOR_ATTR(temp8_max, 0644, show_temp_max, store_temp_max, 7),
605 SENSOR_ATTR(temp8_fault, 0444, show_temp_fault, NULL, 7),
606 SENSOR_ATTR(temp8_alarm, 0444, show_temp_alarm, NULL, 7),
607 SENSOR_ATTR(temp9_input, 0444, show_temp_value, NULL, 8),
608 SENSOR_ATTR(temp9_max, 0644, show_temp_max, store_temp_max, 8),
609 SENSOR_ATTR(temp9_fault, 0444, show_temp_fault, NULL, 8),
610 SENSOR_ATTR(temp9_alarm, 0444, show_temp_alarm, NULL, 8),
611 SENSOR_ATTR(temp10_input, 0444, show_temp_value, NULL, 9),
612 SENSOR_ATTR(temp10_max, 0644, show_temp_max, store_temp_max, 9),
613 SENSOR_ATTR(temp10_fault, 0444, show_temp_fault, NULL, 9),
614 SENSOR_ATTR(temp10_alarm, 0444, show_temp_alarm, NULL, 9),
615 SENSOR_ATTR(temp11_input, 0444, show_temp_value, NULL, 10),
616 SENSOR_ATTR(temp11_max, 0644, show_temp_max, store_temp_max, 10),
617 SENSOR_ATTR(temp11_fault, 0444, show_temp_fault, NULL, 10),
618 SENSOR_ATTR(temp11_alarm, 0444, show_temp_alarm, NULL, 10),
619};
620
621static struct sensor_device_attribute fschmd_fan_attr[] = {
622 SENSOR_ATTR(fan1_input, 0444, show_fan_value, NULL, 0),
623 SENSOR_ATTR(fan1_div, 0644, show_fan_div, store_fan_div, 0),
624 SENSOR_ATTR(fan1_alarm, 0444, show_fan_alarm, NULL, 0),
625 SENSOR_ATTR(fan1_fault, 0444, show_fan_fault, NULL, 0),
626 SENSOR_ATTR(pwm1_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
627 store_pwm_auto_point1_pwm, 0),
628 SENSOR_ATTR(fan2_input, 0444, show_fan_value, NULL, 1),
629 SENSOR_ATTR(fan2_div, 0644, show_fan_div, store_fan_div, 1),
630 SENSOR_ATTR(fan2_alarm, 0444, show_fan_alarm, NULL, 1),
631 SENSOR_ATTR(fan2_fault, 0444, show_fan_fault, NULL, 1),
632 SENSOR_ATTR(pwm2_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
633 store_pwm_auto_point1_pwm, 1),
634 SENSOR_ATTR(fan3_input, 0444, show_fan_value, NULL, 2),
635 SENSOR_ATTR(fan3_div, 0644, show_fan_div, store_fan_div, 2),
636 SENSOR_ATTR(fan3_alarm, 0444, show_fan_alarm, NULL, 2),
637 SENSOR_ATTR(fan3_fault, 0444, show_fan_fault, NULL, 2),
638 SENSOR_ATTR(pwm3_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
639 store_pwm_auto_point1_pwm, 2),
640 SENSOR_ATTR(fan4_input, 0444, show_fan_value, NULL, 3),
641 SENSOR_ATTR(fan4_div, 0644, show_fan_div, store_fan_div, 3),
642 SENSOR_ATTR(fan4_alarm, 0444, show_fan_alarm, NULL, 3),
643 SENSOR_ATTR(fan4_fault, 0444, show_fan_fault, NULL, 3),
644 SENSOR_ATTR(pwm4_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
645 store_pwm_auto_point1_pwm, 3),
646 SENSOR_ATTR(fan5_input, 0444, show_fan_value, NULL, 4),
647 SENSOR_ATTR(fan5_div, 0644, show_fan_div, store_fan_div, 4),
648 SENSOR_ATTR(fan5_alarm, 0444, show_fan_alarm, NULL, 4),
649 SENSOR_ATTR(fan5_fault, 0444, show_fan_fault, NULL, 4),
650 SENSOR_ATTR(pwm5_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
651 store_pwm_auto_point1_pwm, 4),
652 SENSOR_ATTR(fan6_input, 0444, show_fan_value, NULL, 5),
653 SENSOR_ATTR(fan6_div, 0644, show_fan_div, store_fan_div, 5),
654 SENSOR_ATTR(fan6_alarm, 0444, show_fan_alarm, NULL, 5),
655 SENSOR_ATTR(fan6_fault, 0444, show_fan_fault, NULL, 5),
656 SENSOR_ATTR(pwm6_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
657 store_pwm_auto_point1_pwm, 5),
658 SENSOR_ATTR(fan7_input, 0444, show_fan_value, NULL, 6),
659 SENSOR_ATTR(fan7_div, 0644, show_fan_div, store_fan_div, 6),
660 SENSOR_ATTR(fan7_alarm, 0444, show_fan_alarm, NULL, 6),
661 SENSOR_ATTR(fan7_fault, 0444, show_fan_fault, NULL, 6),
662 SENSOR_ATTR(pwm7_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
663 store_pwm_auto_point1_pwm, 6),
664};
665
666
667/*
668 * Watchdog routines
669 */
670
671static int watchdog_set_timeout(struct fschmd_data *data, int timeout)
672{
673 int ret, resolution;
674 int kind = data->kind + 1; /* 0-x array index -> 1-x module param */
675
676 /* 2 second or 60 second resolution? */
677 if (timeout <= 510 || kind == fscpos || kind == fscscy)
678 resolution = 2;
679 else
680 resolution = 60;
681
682 if (timeout < resolution || timeout > (resolution * 255))
683 return -EINVAL;
684
685 mutex_lock(&data->watchdog_lock);
686 if (!data->client) {
687 ret = -ENODEV;
688 goto leave;
689 }
690
691 if (resolution == 2)
692 data->watchdog_control &= ~FSCHMD_WDOG_CONTROL_RESOLUTION;
693 else
694 data->watchdog_control |= FSCHMD_WDOG_CONTROL_RESOLUTION;
695
696 data->watchdog_preset = DIV_ROUND_UP(timeout, resolution);
697
698 /* Write new timeout value */
699 i2c_smbus_write_byte_data(data->client,
700 FSCHMD_REG_WDOG_PRESET[data->kind], data->watchdog_preset);
701 /* Write new control register, do not trigger! */
702 i2c_smbus_write_byte_data(data->client,
703 FSCHMD_REG_WDOG_CONTROL[data->kind],
704 data->watchdog_control & ~FSCHMD_WDOG_CONTROL_TRIGGER);
705
706 ret = data->watchdog_preset * resolution;
707
708leave:
709 mutex_unlock(&data->watchdog_lock);
710 return ret;
711}
712
713static int watchdog_get_timeout(struct fschmd_data *data)
714{
715 int timeout;
716
717 mutex_lock(&data->watchdog_lock);
718 if (data->watchdog_control & FSCHMD_WDOG_CONTROL_RESOLUTION)
719 timeout = data->watchdog_preset * 60;
720 else
721 timeout = data->watchdog_preset * 2;
722 mutex_unlock(&data->watchdog_lock);
723
724 return timeout;
725}
726
727static int watchdog_trigger(struct fschmd_data *data)
728{
729 int ret = 0;
730
731 mutex_lock(&data->watchdog_lock);
732 if (!data->client) {
733 ret = -ENODEV;
734 goto leave;
735 }
736
737 data->watchdog_control |= FSCHMD_WDOG_CONTROL_TRIGGER;
738 i2c_smbus_write_byte_data(data->client,
739 FSCHMD_REG_WDOG_CONTROL[data->kind],
740 data->watchdog_control);
741leave:
742 mutex_unlock(&data->watchdog_lock);
743 return ret;
744}
745
746static int watchdog_stop(struct fschmd_data *data)
747{
748 int ret = 0;
749
750 mutex_lock(&data->watchdog_lock);
751 if (!data->client) {
752 ret = -ENODEV;
753 goto leave;
754 }
755
756 data->watchdog_control &= ~FSCHMD_WDOG_CONTROL_STARTED;
757 /* Don't store the stop flag in our watchdog control register copy, as
758 its a write only bit (read always returns 0) */
759 i2c_smbus_write_byte_data(data->client,
760 FSCHMD_REG_WDOG_CONTROL[data->kind],
761 data->watchdog_control | FSCHMD_WDOG_CONTROL_STOP);
762leave:
763 mutex_unlock(&data->watchdog_lock);
764 return ret;
765}
766
767static int watchdog_open(struct inode *inode, struct file *filp)
768{
769 struct fschmd_data *pos, *data = NULL;
770 int watchdog_is_open;
771
772 /* We get called from drivers/char/misc.c with misc_mtx hold, and we
773 call misc_register() from fschmd_probe() with watchdog_data_mutex
774 hold, as misc_register() takes the misc_mtx lock, this is a possible
775 deadlock, so we use mutex_trylock here. */
776 if (!mutex_trylock(&watchdog_data_mutex))
777 return -ERESTARTSYS;
778 list_for_each_entry(pos, &watchdog_data_list, list) {
779 if (pos->watchdog_miscdev.minor == iminor(inode)) {
780 data = pos;
781 break;
782 }
783 }
784 /* Note we can never not have found data, so we don't check for this */
785 watchdog_is_open = test_and_set_bit(0, &data->watchdog_is_open);
786 if (!watchdog_is_open)
787 kref_get(&data->kref);
788 mutex_unlock(&watchdog_data_mutex);
789
790 if (watchdog_is_open)
791 return -EBUSY;
792
793 /* Start the watchdog */
794 watchdog_trigger(data);
795 filp->private_data = data;
796
797 return nonseekable_open(inode, filp);
798}
799
800static int watchdog_release(struct inode *inode, struct file *filp)
801{
802 struct fschmd_data *data = filp->private_data;
803
804 if (data->watchdog_expect_close) {
805 watchdog_stop(data);
806 data->watchdog_expect_close = 0;
807 } else {
808 watchdog_trigger(data);
809 dev_crit(&data->client->dev,
810 "unexpected close, not stopping watchdog!\n");
811 }
812
813 clear_bit(0, &data->watchdog_is_open);
814
815 mutex_lock(&watchdog_data_mutex);
816 kref_put(&data->kref, fschmd_release_resources);
817 mutex_unlock(&watchdog_data_mutex);
818
819 return 0;
820}
821
822static ssize_t watchdog_write(struct file *filp, const char __user *buf,
823 size_t count, loff_t *offset)
824{
825 int ret;
826 struct fschmd_data *data = filp->private_data;
827
828 if (count) {
829 if (!nowayout) {
830 size_t i;
831
832 /* Clear it in case it was set with a previous write */
833 data->watchdog_expect_close = 0;
834
835 for (i = 0; i != count; i++) {
836 char c;
837 if (get_user(c, buf + i))
838 return -EFAULT;
839 if (c == 'V')
840 data->watchdog_expect_close = 1;
841 }
842 }
843 ret = watchdog_trigger(data);
844 if (ret < 0)
845 return ret;
846 }
847 return count;
848}
849
850static long watchdog_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
851{
852 struct watchdog_info ident = {
853 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
854 WDIOF_CARDRESET,
855 .identity = "FSC watchdog"
856 };
857 int i, ret = 0;
858 struct fschmd_data *data = filp->private_data;
859
860 switch (cmd) {
861 case WDIOC_GETSUPPORT:
862 ident.firmware_version = data->revision;
863 if (!nowayout)
864 ident.options |= WDIOF_MAGICCLOSE;
865 if (copy_to_user((void __user *)arg, &ident, sizeof(ident)))
866 ret = -EFAULT;
867 break;
868
869 case WDIOC_GETSTATUS:
870 ret = put_user(0, (int __user *)arg);
871 break;
872
873 case WDIOC_GETBOOTSTATUS:
874 if (data->watchdog_state & FSCHMD_WDOG_STATE_CARDRESET)
875 ret = put_user(WDIOF_CARDRESET, (int __user *)arg);
876 else
877 ret = put_user(0, (int __user *)arg);
878 break;
879
880 case WDIOC_KEEPALIVE:
881 ret = watchdog_trigger(data);
882 break;
883
884 case WDIOC_GETTIMEOUT:
885 i = watchdog_get_timeout(data);
886 ret = put_user(i, (int __user *)arg);
887 break;
888
889 case WDIOC_SETTIMEOUT:
890 if (get_user(i, (int __user *)arg)) {
891 ret = -EFAULT;
892 break;
893 }
894 ret = watchdog_set_timeout(data, i);
895 if (ret > 0)
896 ret = put_user(ret, (int __user *)arg);
897 break;
898
899 case WDIOC_SETOPTIONS:
900 if (get_user(i, (int __user *)arg)) {
901 ret = -EFAULT;
902 break;
903 }
904
905 if (i & WDIOS_DISABLECARD)
906 ret = watchdog_stop(data);
907 else if (i & WDIOS_ENABLECARD)
908 ret = watchdog_trigger(data);
909 else
910 ret = -EINVAL;
911
912 break;
913 default:
914 ret = -ENOTTY;
915 }
916 return ret;
917}
918
919static const struct file_operations watchdog_fops = {
920 .owner = THIS_MODULE,
921 .llseek = no_llseek,
922 .open = watchdog_open,
923 .release = watchdog_release,
924 .write = watchdog_write,
925 .unlocked_ioctl = watchdog_ioctl,
926};
927
928
929/*
930 * Detect, register, unregister and update device functions
931 */
932
933/* DMI decode routine to read voltage scaling factors from special DMI tables,
934 which are available on FSC machines with an fscher or later chip. */
935static void fschmd_dmi_decode(const struct dmi_header *header, void *dummy)
936{
937 int i, mult[3] = { 0 }, offset[3] = { 0 }, vref = 0, found = 0;
938
939 /* dmi code ugliness, we get passed the address of the contents of
940 a complete DMI record, but in the form of a dmi_header pointer, in
941 reality this address holds header->length bytes of which the header
942 are the first 4 bytes */
943 u8 *dmi_data = (u8 *)header;
944
945 /* We are looking for OEM-specific type 185 */
946 if (header->type != 185)
947 return;
948
949 /* we are looking for what Siemens calls "subtype" 19, the subtype
950 is stored in byte 5 of the dmi block */
951 if (header->length < 5 || dmi_data[4] != 19)
952 return;
953
954 /* After the subtype comes 1 unknown byte and then blocks of 5 bytes,
955 consisting of what Siemens calls an "Entity" number, followed by
956 2 16-bit words in LSB first order */
957 for (i = 6; (i + 4) < header->length; i += 5) {
958 /* entity 1 - 3: voltage multiplier and offset */
959 if (dmi_data[i] >= 1 && dmi_data[i] <= 3) {
960 /* Our in sensors order and the DMI order differ */
961 const int shuffle[3] = { 1, 0, 2 };
962 int in = shuffle[dmi_data[i] - 1];
963
964 /* Check for twice the same entity */
965 if (found & (1 << in))
966 return;
967
968 mult[in] = dmi_data[i + 1] | (dmi_data[i + 2] << 8);
969 offset[in] = dmi_data[i + 3] | (dmi_data[i + 4] << 8);
970
971 found |= 1 << in;
972 }
973
974 /* entity 7: reference voltage */
975 if (dmi_data[i] == 7) {
976 /* Check for twice the same entity */
977 if (found & 0x08)
978 return;
979
980 vref = dmi_data[i + 1] | (dmi_data[i + 2] << 8);
981
982 found |= 0x08;
983 }
984 }
985
986 if (found == 0x0F) {
987 for (i = 0; i < 3; i++) {
988 dmi_mult[i] = mult[i] * 10;
989 dmi_offset[i] = offset[i] * 10;
990 }
991 /* According to the docs there should be separate dmi entries
992 for the mult's and offsets of in3-5 of the syl, but on
993 my test machine these are not present */
994 dmi_mult[3] = dmi_mult[2];
995 dmi_mult[4] = dmi_mult[1];
996 dmi_mult[5] = dmi_mult[2];
997 dmi_offset[3] = dmi_offset[2];
998 dmi_offset[4] = dmi_offset[1];
999 dmi_offset[5] = dmi_offset[2];
1000 dmi_vref = vref;
1001 }
1002}
1003
1004static int fschmd_detect(struct i2c_client *client,
1005 struct i2c_board_info *info)
1006{
1007 enum chips kind;
1008 struct i2c_adapter *adapter = client->adapter;
1009 char id[4];
1010
1011 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
1012 return -ENODEV;
1013
1014 /* Detect & Identify the chip */
1015 id[0] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_0);
1016 id[1] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_1);
1017 id[2] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_2);
1018 id[3] = '\0';
1019
1020 if (!strcmp(id, "PEG"))
1021 kind = fscpos;
1022 else if (!strcmp(id, "HER"))
1023 kind = fscher;
1024 else if (!strcmp(id, "SCY"))
1025 kind = fscscy;
1026 else if (!strcmp(id, "HRC"))
1027 kind = fschrc;
1028 else if (!strcmp(id, "HMD"))
1029 kind = fschmd;
1030 else if (!strcmp(id, "HDS"))
1031 kind = fschds;
1032 else if (!strcmp(id, "SYL"))
1033 kind = fscsyl;
1034 else
1035 return -ENODEV;
1036
1037 strlcpy(info->type, fschmd_id[kind].name, I2C_NAME_SIZE);
1038
1039 return 0;
1040}
1041
1042static int fschmd_probe(struct i2c_client *client,
1043 const struct i2c_device_id *id)
1044{
1045 struct fschmd_data *data;
1046 const char * const names[7] = { "Poseidon", "Hermes", "Scylla",
1047 "Heracles", "Heimdall", "Hades", "Syleus" };
1048 const int watchdog_minors[] = { WATCHDOG_MINOR, 212, 213, 214, 215 };
1049 int i, err;
1050 enum chips kind = id->driver_data;
1051
1052 data = kzalloc(sizeof(struct fschmd_data), GFP_KERNEL);
1053 if (!data)
1054 return -ENOMEM;
1055
1056 i2c_set_clientdata(client, data);
1057 mutex_init(&data->update_lock);
1058 mutex_init(&data->watchdog_lock);
1059 INIT_LIST_HEAD(&data->list);
1060 kref_init(&data->kref);
1061 /* Store client pointer in our data struct for watchdog usage
1062 (where the client is found through a data ptr instead of the
1063 otherway around) */
1064 data->client = client;
1065 data->kind = kind;
1066
1067 if (kind == fscpos) {
1068 /* The Poseidon has hardwired temp limits, fill these
1069 in for the alarm resetting code */
1070 data->temp_max[0] = 70 + 128;
1071 data->temp_max[1] = 50 + 128;
1072 data->temp_max[2] = 50 + 128;
1073 }
1074
1075 /* Read the special DMI table for fscher and newer chips */
1076 if ((kind == fscher || kind >= fschrc) && dmi_vref == -1) {
1077 dmi_walk(fschmd_dmi_decode, NULL);
1078 if (dmi_vref == -1) {
1079 dev_warn(&client->dev,
1080 "Couldn't get voltage scaling factors from "
1081 "BIOS DMI table, using builtin defaults\n");
1082 dmi_vref = 33;
1083 }
1084 }
1085
1086 /* Read in some never changing registers */
1087 data->revision = i2c_smbus_read_byte_data(client, FSCHMD_REG_REVISION);
1088 data->global_control = i2c_smbus_read_byte_data(client,
1089 FSCHMD_REG_CONTROL);
1090 data->watchdog_control = i2c_smbus_read_byte_data(client,
1091 FSCHMD_REG_WDOG_CONTROL[data->kind]);
1092 data->watchdog_state = i2c_smbus_read_byte_data(client,
1093 FSCHMD_REG_WDOG_STATE[data->kind]);
1094 data->watchdog_preset = i2c_smbus_read_byte_data(client,
1095 FSCHMD_REG_WDOG_PRESET[data->kind]);
1096
1097 err = device_create_file(&client->dev, &dev_attr_alert_led);
1098 if (err)
1099 goto exit_detach;
1100
1101 for (i = 0; i < FSCHMD_NO_VOLT_SENSORS[data->kind]; i++) {
1102 err = device_create_file(&client->dev,
1103 &fschmd_attr[i].dev_attr);
1104 if (err)
1105 goto exit_detach;
1106 }
1107
1108 for (i = 0; i < (FSCHMD_NO_TEMP_SENSORS[data->kind] * 4); i++) {
1109 /* Poseidon doesn't have TEMP_LIMIT registers */
1110 if (kind == fscpos && fschmd_temp_attr[i].dev_attr.show ==
1111 show_temp_max)
1112 continue;
1113
1114 if (kind == fscsyl) {
1115 if (i % 4 == 0)
1116 data->temp_status[i / 4] =
1117 i2c_smbus_read_byte_data(client,
1118 FSCHMD_REG_TEMP_STATE
1119 [data->kind][i / 4]);
1120 if (data->temp_status[i / 4] & FSCHMD_TEMP_DISABLED)
1121 continue;
1122 }
1123
1124 err = device_create_file(&client->dev,
1125 &fschmd_temp_attr[i].dev_attr);
1126 if (err)
1127 goto exit_detach;
1128 }
1129
1130 for (i = 0; i < (FSCHMD_NO_FAN_SENSORS[data->kind] * 5); i++) {
1131 /* Poseidon doesn't have a FAN_MIN register for its 3rd fan */
1132 if (kind == fscpos &&
1133 !strcmp(fschmd_fan_attr[i].dev_attr.attr.name,
1134 "pwm3_auto_point1_pwm"))
1135 continue;
1136
1137 if (kind == fscsyl) {
1138 if (i % 5 == 0)
1139 data->fan_status[i / 5] =
1140 i2c_smbus_read_byte_data(client,
1141 FSCHMD_REG_FAN_STATE
1142 [data->kind][i / 5]);
1143 if (data->fan_status[i / 5] & FSCHMD_FAN_DISABLED)
1144 continue;
1145 }
1146
1147 err = device_create_file(&client->dev,
1148 &fschmd_fan_attr[i].dev_attr);
1149 if (err)
1150 goto exit_detach;
1151 }
1152
1153 data->hwmon_dev = hwmon_device_register(&client->dev);
1154 if (IS_ERR(data->hwmon_dev)) {
1155 err = PTR_ERR(data->hwmon_dev);
1156 data->hwmon_dev = NULL;
1157 goto exit_detach;
1158 }
1159
1160 /* We take the data_mutex lock early so that watchdog_open() cannot
1161 run when misc_register() has completed, but we've not yet added
1162 our data to the watchdog_data_list (and set the default timeout) */
1163 mutex_lock(&watchdog_data_mutex);
1164 for (i = 0; i < ARRAY_SIZE(watchdog_minors); i++) {
1165 /* Register our watchdog part */
1166 snprintf(data->watchdog_name, sizeof(data->watchdog_name),
1167 "watchdog%c", (i == 0) ? '\0' : ('0' + i));
1168 data->watchdog_miscdev.name = data->watchdog_name;
1169 data->watchdog_miscdev.fops = &watchdog_fops;
1170 data->watchdog_miscdev.minor = watchdog_minors[i];
1171 err = misc_register(&data->watchdog_miscdev);
1172 if (err == -EBUSY)
1173 continue;
1174 if (err) {
1175 data->watchdog_miscdev.minor = 0;
1176 dev_err(&client->dev,
1177 "Registering watchdog chardev: %d\n", err);
1178 break;
1179 }
1180
1181 list_add(&data->list, &watchdog_data_list);
1182 watchdog_set_timeout(data, 60);
1183 dev_info(&client->dev,
1184 "Registered watchdog chardev major 10, minor: %d\n",
1185 watchdog_minors[i]);
1186 break;
1187 }
1188 if (i == ARRAY_SIZE(watchdog_minors)) {
1189 data->watchdog_miscdev.minor = 0;
1190 dev_warn(&client->dev, "Couldn't register watchdog chardev "
1191 "(due to no free minor)\n");
1192 }
1193 mutex_unlock(&watchdog_data_mutex);
1194
1195 dev_info(&client->dev, "Detected FSC %s chip, revision: %d\n",
1196 names[data->kind], (int) data->revision);
1197
1198 return 0;
1199
1200exit_detach:
1201 fschmd_remove(client); /* will also free data for us */
1202 return err;
1203}
1204
1205static int fschmd_remove(struct i2c_client *client)
1206{
1207 struct fschmd_data *data = i2c_get_clientdata(client);
1208 int i;
1209
1210 /* Unregister the watchdog (if registered) */
1211 if (data->watchdog_miscdev.minor) {
1212 misc_deregister(&data->watchdog_miscdev);
1213 if (data->watchdog_is_open) {
1214 dev_warn(&client->dev,
1215 "i2c client detached with watchdog open! "
1216 "Stopping watchdog.\n");
1217 watchdog_stop(data);
1218 }
1219 mutex_lock(&watchdog_data_mutex);
1220 list_del(&data->list);
1221 mutex_unlock(&watchdog_data_mutex);
1222 /* Tell the watchdog code the client is gone */
1223 mutex_lock(&data->watchdog_lock);
1224 data->client = NULL;
1225 mutex_unlock(&data->watchdog_lock);
1226 }
1227
1228 /* Check if registered in case we're called from fschmd_detect
1229 to cleanup after an error */
1230 if (data->hwmon_dev)
1231 hwmon_device_unregister(data->hwmon_dev);
1232
1233 device_remove_file(&client->dev, &dev_attr_alert_led);
1234 for (i = 0; i < (FSCHMD_NO_VOLT_SENSORS[data->kind]); i++)
1235 device_remove_file(&client->dev, &fschmd_attr[i].dev_attr);
1236 for (i = 0; i < (FSCHMD_NO_TEMP_SENSORS[data->kind] * 4); i++)
1237 device_remove_file(&client->dev,
1238 &fschmd_temp_attr[i].dev_attr);
1239 for (i = 0; i < (FSCHMD_NO_FAN_SENSORS[data->kind] * 5); i++)
1240 device_remove_file(&client->dev,
1241 &fschmd_fan_attr[i].dev_attr);
1242
1243 mutex_lock(&watchdog_data_mutex);
1244 kref_put(&data->kref, fschmd_release_resources);
1245 mutex_unlock(&watchdog_data_mutex);
1246
1247 return 0;
1248}
1249
1250static struct fschmd_data *fschmd_update_device(struct device *dev)
1251{
1252 struct i2c_client *client = to_i2c_client(dev);
1253 struct fschmd_data *data = i2c_get_clientdata(client);
1254 int i;
1255
1256 mutex_lock(&data->update_lock);
1257
1258 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
1259
1260 for (i = 0; i < FSCHMD_NO_TEMP_SENSORS[data->kind]; i++) {
1261 data->temp_act[i] = i2c_smbus_read_byte_data(client,
1262 FSCHMD_REG_TEMP_ACT[data->kind][i]);
1263 data->temp_status[i] = i2c_smbus_read_byte_data(client,
1264 FSCHMD_REG_TEMP_STATE[data->kind][i]);
1265
1266 /* The fscpos doesn't have TEMP_LIMIT registers */
1267 if (FSCHMD_REG_TEMP_LIMIT[data->kind][i])
1268 data->temp_max[i] = i2c_smbus_read_byte_data(
1269 client,
1270 FSCHMD_REG_TEMP_LIMIT[data->kind][i]);
1271
1272 /* reset alarm if the alarm condition is gone,
1273 the chip doesn't do this itself */
1274 if ((data->temp_status[i] & FSCHMD_TEMP_ALARM_MASK) ==
1275 FSCHMD_TEMP_ALARM_MASK &&
1276 data->temp_act[i] < data->temp_max[i])
1277 i2c_smbus_write_byte_data(client,
1278 FSCHMD_REG_TEMP_STATE[data->kind][i],
1279 data->temp_status[i]);
1280 }
1281
1282 for (i = 0; i < FSCHMD_NO_FAN_SENSORS[data->kind]; i++) {
1283 data->fan_act[i] = i2c_smbus_read_byte_data(client,
1284 FSCHMD_REG_FAN_ACT[data->kind][i]);
1285 data->fan_status[i] = i2c_smbus_read_byte_data(client,
1286 FSCHMD_REG_FAN_STATE[data->kind][i]);
1287 data->fan_ripple[i] = i2c_smbus_read_byte_data(client,
1288 FSCHMD_REG_FAN_RIPPLE[data->kind][i]);
1289
1290 /* The fscpos third fan doesn't have a fan_min */
1291 if (FSCHMD_REG_FAN_MIN[data->kind][i])
1292 data->fan_min[i] = i2c_smbus_read_byte_data(
1293 client,
1294 FSCHMD_REG_FAN_MIN[data->kind][i]);
1295
1296 /* reset fan status if speed is back to > 0 */
1297 if ((data->fan_status[i] & FSCHMD_FAN_ALARM) &&
1298 data->fan_act[i])
1299 i2c_smbus_write_byte_data(client,
1300 FSCHMD_REG_FAN_STATE[data->kind][i],
1301 data->fan_status[i]);
1302 }
1303
1304 for (i = 0; i < FSCHMD_NO_VOLT_SENSORS[data->kind]; i++)
1305 data->volt[i] = i2c_smbus_read_byte_data(client,
1306 FSCHMD_REG_VOLT[data->kind][i]);
1307
1308 data->last_updated = jiffies;
1309 data->valid = 1;
1310 }
1311
1312 mutex_unlock(&data->update_lock);
1313
1314 return data;
1315}
1316
1317static int __init fschmd_init(void)
1318{
1319 return i2c_add_driver(&fschmd_driver);
1320}
1321
1322static void __exit fschmd_exit(void)
1323{
1324 i2c_del_driver(&fschmd_driver);
1325}
1326
1327MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
1328MODULE_DESCRIPTION("FSC Poseidon, Hermes, Scylla, Heracles, Heimdall, Hades "
1329 "and Syleus driver");
1330MODULE_LICENSE("GPL");
1331
1332module_init(fschmd_init);
1333module_exit(fschmd_exit);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * fschmd.c
4 *
5 * Copyright (C) 2007 - 2009 Hans de Goede <hdegoede@redhat.com>
6 */
7
8/*
9 * Merged Fujitsu Siemens hwmon driver, supporting the Poseidon, Hermes,
10 * Scylla, Heracles, Heimdall, Hades and Syleus chips
11 *
12 * Based on the original 2.4 fscscy, 2.6 fscpos, 2.6 fscher and 2.6
13 * (candidate) fschmd drivers:
14 * Copyright (C) 2006 Thilo Cestonaro
15 * <thilo.cestonaro.external@fujitsu-siemens.com>
16 * Copyright (C) 2004, 2005 Stefan Ott <stefan@desire.ch>
17 * Copyright (C) 2003, 2004 Reinhard Nissl <rnissl@gmx.de>
18 * Copyright (c) 2001 Martin Knoblauch <mkn@teraport.de, knobi@knobisoft.de>
19 * Copyright (C) 2000 Hermann Jung <hej@odn.de>
20 */
21
22#include <linux/module.h>
23#include <linux/init.h>
24#include <linux/slab.h>
25#include <linux/jiffies.h>
26#include <linux/i2c.h>
27#include <linux/hwmon.h>
28#include <linux/hwmon-sysfs.h>
29#include <linux/err.h>
30#include <linux/mutex.h>
31#include <linux/sysfs.h>
32#include <linux/dmi.h>
33#include <linux/fs.h>
34#include <linux/watchdog.h>
35#include <linux/miscdevice.h>
36#include <linux/uaccess.h>
37#include <linux/kref.h>
38
39/* Addresses to scan */
40static const unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };
41
42/* Insmod parameters */
43static bool nowayout = WATCHDOG_NOWAYOUT;
44module_param(nowayout, bool, 0);
45MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
46 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
47
48enum chips { fscpos, fscher, fscscy, fschrc, fschmd, fschds, fscsyl };
49
50/*
51 * The FSCHMD registers and other defines
52 */
53
54/* chip identification */
55#define FSCHMD_REG_IDENT_0 0x00
56#define FSCHMD_REG_IDENT_1 0x01
57#define FSCHMD_REG_IDENT_2 0x02
58#define FSCHMD_REG_REVISION 0x03
59
60/* global control and status */
61#define FSCHMD_REG_EVENT_STATE 0x04
62#define FSCHMD_REG_CONTROL 0x05
63
64#define FSCHMD_CONTROL_ALERT_LED 0x01
65
66/* watchdog */
67static const u8 FSCHMD_REG_WDOG_CONTROL[7] = {
68 0x21, 0x21, 0x21, 0x21, 0x21, 0x28, 0x28 };
69static const u8 FSCHMD_REG_WDOG_STATE[7] = {
70 0x23, 0x23, 0x23, 0x23, 0x23, 0x29, 0x29 };
71static const u8 FSCHMD_REG_WDOG_PRESET[7] = {
72 0x28, 0x28, 0x28, 0x28, 0x28, 0x2a, 0x2a };
73
74#define FSCHMD_WDOG_CONTROL_TRIGGER 0x10
75#define FSCHMD_WDOG_CONTROL_STARTED 0x10 /* the same as trigger */
76#define FSCHMD_WDOG_CONTROL_STOP 0x20
77#define FSCHMD_WDOG_CONTROL_RESOLUTION 0x40
78
79#define FSCHMD_WDOG_STATE_CARDRESET 0x02
80
81/* voltages, weird order is to keep the same order as the old drivers */
82static const u8 FSCHMD_REG_VOLT[7][6] = {
83 { 0x45, 0x42, 0x48 }, /* pos */
84 { 0x45, 0x42, 0x48 }, /* her */
85 { 0x45, 0x42, 0x48 }, /* scy */
86 { 0x45, 0x42, 0x48 }, /* hrc */
87 { 0x45, 0x42, 0x48 }, /* hmd */
88 { 0x21, 0x20, 0x22 }, /* hds */
89 { 0x21, 0x20, 0x22, 0x23, 0x24, 0x25 }, /* syl */
90};
91
92static const int FSCHMD_NO_VOLT_SENSORS[7] = { 3, 3, 3, 3, 3, 3, 6 };
93
94/*
95 * minimum pwm at which the fan is driven (pwm can be increased depending on
96 * the temp. Notice that for the scy some fans share there minimum speed.
97 * Also notice that with the scy the sensor order is different than with the
98 * other chips, this order was in the 2.4 driver and kept for consistency.
99 */
100static const u8 FSCHMD_REG_FAN_MIN[7][7] = {
101 { 0x55, 0x65 }, /* pos */
102 { 0x55, 0x65, 0xb5 }, /* her */
103 { 0x65, 0x65, 0x55, 0xa5, 0x55, 0xa5 }, /* scy */
104 { 0x55, 0x65, 0xa5, 0xb5 }, /* hrc */
105 { 0x55, 0x65, 0xa5, 0xb5, 0xc5 }, /* hmd */
106 { 0x55, 0x65, 0xa5, 0xb5, 0xc5 }, /* hds */
107 { 0x54, 0x64, 0x74, 0x84, 0x94, 0xa4, 0xb4 }, /* syl */
108};
109
110/* actual fan speed */
111static const u8 FSCHMD_REG_FAN_ACT[7][7] = {
112 { 0x0e, 0x6b, 0xab }, /* pos */
113 { 0x0e, 0x6b, 0xbb }, /* her */
114 { 0x6b, 0x6c, 0x0e, 0xab, 0x5c, 0xbb }, /* scy */
115 { 0x0e, 0x6b, 0xab, 0xbb }, /* hrc */
116 { 0x5b, 0x6b, 0xab, 0xbb, 0xcb }, /* hmd */
117 { 0x5b, 0x6b, 0xab, 0xbb, 0xcb }, /* hds */
118 { 0x57, 0x67, 0x77, 0x87, 0x97, 0xa7, 0xb7 }, /* syl */
119};
120
121/* fan status registers */
122static const u8 FSCHMD_REG_FAN_STATE[7][7] = {
123 { 0x0d, 0x62, 0xa2 }, /* pos */
124 { 0x0d, 0x62, 0xb2 }, /* her */
125 { 0x62, 0x61, 0x0d, 0xa2, 0x52, 0xb2 }, /* scy */
126 { 0x0d, 0x62, 0xa2, 0xb2 }, /* hrc */
127 { 0x52, 0x62, 0xa2, 0xb2, 0xc2 }, /* hmd */
128 { 0x52, 0x62, 0xa2, 0xb2, 0xc2 }, /* hds */
129 { 0x50, 0x60, 0x70, 0x80, 0x90, 0xa0, 0xb0 }, /* syl */
130};
131
132/* fan ripple / divider registers */
133static const u8 FSCHMD_REG_FAN_RIPPLE[7][7] = {
134 { 0x0f, 0x6f, 0xaf }, /* pos */
135 { 0x0f, 0x6f, 0xbf }, /* her */
136 { 0x6f, 0x6f, 0x0f, 0xaf, 0x0f, 0xbf }, /* scy */
137 { 0x0f, 0x6f, 0xaf, 0xbf }, /* hrc */
138 { 0x5f, 0x6f, 0xaf, 0xbf, 0xcf }, /* hmd */
139 { 0x5f, 0x6f, 0xaf, 0xbf, 0xcf }, /* hds */
140 { 0x56, 0x66, 0x76, 0x86, 0x96, 0xa6, 0xb6 }, /* syl */
141};
142
143static const int FSCHMD_NO_FAN_SENSORS[7] = { 3, 3, 6, 4, 5, 5, 7 };
144
145/* Fan status register bitmasks */
146#define FSCHMD_FAN_ALARM 0x04 /* called fault by FSC! */
147#define FSCHMD_FAN_NOT_PRESENT 0x08
148#define FSCHMD_FAN_DISABLED 0x80
149
150
151/* actual temperature registers */
152static const u8 FSCHMD_REG_TEMP_ACT[7][11] = {
153 { 0x64, 0x32, 0x35 }, /* pos */
154 { 0x64, 0x32, 0x35 }, /* her */
155 { 0x64, 0xD0, 0x32, 0x35 }, /* scy */
156 { 0x64, 0x32, 0x35 }, /* hrc */
157 { 0x70, 0x80, 0x90, 0xd0, 0xe0 }, /* hmd */
158 { 0x70, 0x80, 0x90, 0xd0, 0xe0 }, /* hds */
159 { 0x58, 0x68, 0x78, 0x88, 0x98, 0xa8, /* syl */
160 0xb8, 0xc8, 0xd8, 0xe8, 0xf8 },
161};
162
163/* temperature state registers */
164static const u8 FSCHMD_REG_TEMP_STATE[7][11] = {
165 { 0x71, 0x81, 0x91 }, /* pos */
166 { 0x71, 0x81, 0x91 }, /* her */
167 { 0x71, 0xd1, 0x81, 0x91 }, /* scy */
168 { 0x71, 0x81, 0x91 }, /* hrc */
169 { 0x71, 0x81, 0x91, 0xd1, 0xe1 }, /* hmd */
170 { 0x71, 0x81, 0x91, 0xd1, 0xe1 }, /* hds */
171 { 0x59, 0x69, 0x79, 0x89, 0x99, 0xa9, /* syl */
172 0xb9, 0xc9, 0xd9, 0xe9, 0xf9 },
173};
174
175/*
176 * temperature high limit registers, FSC does not document these. Proven to be
177 * there with field testing on the fscher and fschrc, already supported / used
178 * in the fscscy 2.4 driver. FSC has confirmed that the fschmd has registers
179 * at these addresses, but doesn't want to confirm they are the same as with
180 * the fscher??
181 */
182static const u8 FSCHMD_REG_TEMP_LIMIT[7][11] = {
183 { 0, 0, 0 }, /* pos */
184 { 0x76, 0x86, 0x96 }, /* her */
185 { 0x76, 0xd6, 0x86, 0x96 }, /* scy */
186 { 0x76, 0x86, 0x96 }, /* hrc */
187 { 0x76, 0x86, 0x96, 0xd6, 0xe6 }, /* hmd */
188 { 0x76, 0x86, 0x96, 0xd6, 0xe6 }, /* hds */
189 { 0x5a, 0x6a, 0x7a, 0x8a, 0x9a, 0xaa, /* syl */
190 0xba, 0xca, 0xda, 0xea, 0xfa },
191};
192
193/*
194 * These were found through experimenting with an fscher, currently they are
195 * not used, but we keep them around for future reference.
196 * On the fscsyl AUTOP1 lives at 0x#c (so 0x5c for fan1, 0x6c for fan2, etc),
197 * AUTOP2 lives at 0x#e, and 0x#1 is a bitmask defining which temps influence
198 * the fan speed.
199 * static const u8 FSCHER_REG_TEMP_AUTOP1[] = { 0x73, 0x83, 0x93 };
200 * static const u8 FSCHER_REG_TEMP_AUTOP2[] = { 0x75, 0x85, 0x95 };
201 */
202
203static const int FSCHMD_NO_TEMP_SENSORS[7] = { 3, 3, 4, 3, 5, 5, 11 };
204
205/* temp status register bitmasks */
206#define FSCHMD_TEMP_WORKING 0x01
207#define FSCHMD_TEMP_ALERT 0x02
208#define FSCHMD_TEMP_DISABLED 0x80
209/* there only really is an alarm if the sensor is working and alert == 1 */
210#define FSCHMD_TEMP_ALARM_MASK \
211 (FSCHMD_TEMP_WORKING | FSCHMD_TEMP_ALERT)
212
213/*
214 * Functions declarations
215 */
216
217static int fschmd_probe(struct i2c_client *client,
218 const struct i2c_device_id *id);
219static int fschmd_detect(struct i2c_client *client,
220 struct i2c_board_info *info);
221static int fschmd_remove(struct i2c_client *client);
222static struct fschmd_data *fschmd_update_device(struct device *dev);
223
224/*
225 * Driver data (common to all clients)
226 */
227
228static const struct i2c_device_id fschmd_id[] = {
229 { "fscpos", fscpos },
230 { "fscher", fscher },
231 { "fscscy", fscscy },
232 { "fschrc", fschrc },
233 { "fschmd", fschmd },
234 { "fschds", fschds },
235 { "fscsyl", fscsyl },
236 { }
237};
238MODULE_DEVICE_TABLE(i2c, fschmd_id);
239
240static struct i2c_driver fschmd_driver = {
241 .class = I2C_CLASS_HWMON,
242 .driver = {
243 .name = "fschmd",
244 },
245 .probe = fschmd_probe,
246 .remove = fschmd_remove,
247 .id_table = fschmd_id,
248 .detect = fschmd_detect,
249 .address_list = normal_i2c,
250};
251
252/*
253 * Client data (each client gets its own)
254 */
255
256struct fschmd_data {
257 struct i2c_client *client;
258 struct device *hwmon_dev;
259 struct mutex update_lock;
260 struct mutex watchdog_lock;
261 struct list_head list; /* member of the watchdog_data_list */
262 struct kref kref;
263 struct miscdevice watchdog_miscdev;
264 enum chips kind;
265 unsigned long watchdog_is_open;
266 char watchdog_expect_close;
267 char watchdog_name[10]; /* must be unique to avoid sysfs conflict */
268 char valid; /* zero until following fields are valid */
269 unsigned long last_updated; /* in jiffies */
270
271 /* register values */
272 u8 revision; /* chip revision */
273 u8 global_control; /* global control register */
274 u8 watchdog_control; /* watchdog control register */
275 u8 watchdog_state; /* watchdog status register */
276 u8 watchdog_preset; /* watchdog counter preset on trigger val */
277 u8 volt[6]; /* voltage */
278 u8 temp_act[11]; /* temperature */
279 u8 temp_status[11]; /* status of sensor */
280 u8 temp_max[11]; /* high temp limit, notice: undocumented! */
281 u8 fan_act[7]; /* fans revolutions per second */
282 u8 fan_status[7]; /* fan status */
283 u8 fan_min[7]; /* fan min value for rps */
284 u8 fan_ripple[7]; /* divider for rps */
285};
286
287/*
288 * Global variables to hold information read from special DMI tables, which are
289 * available on FSC machines with an fscher or later chip. There is no need to
290 * protect these with a lock as they are only modified from our attach function
291 * which always gets called with the i2c-core lock held and never accessed
292 * before the attach function is done with them.
293 */
294static int dmi_mult[6] = { 490, 200, 100, 100, 200, 100 };
295static int dmi_offset[6] = { 0, 0, 0, 0, 0, 0 };
296static int dmi_vref = -1;
297
298/*
299 * Somewhat ugly :( global data pointer list with all fschmd devices, so that
300 * we can find our device data as when using misc_register there is no other
301 * method to get to ones device data from the open fop.
302 */
303static LIST_HEAD(watchdog_data_list);
304/* Note this lock not only protect list access, but also data.kref access */
305static DEFINE_MUTEX(watchdog_data_mutex);
306
307/*
308 * Release our data struct when we're detached from the i2c client *and* all
309 * references to our watchdog device are released
310 */
311static void fschmd_release_resources(struct kref *ref)
312{
313 struct fschmd_data *data = container_of(ref, struct fschmd_data, kref);
314 kfree(data);
315}
316
317/*
318 * Sysfs attr show / store functions
319 */
320
321static ssize_t in_value_show(struct device *dev,
322 struct device_attribute *devattr, char *buf)
323{
324 const int max_reading[3] = { 14200, 6600, 3300 };
325 int index = to_sensor_dev_attr(devattr)->index;
326 struct fschmd_data *data = fschmd_update_device(dev);
327
328 if (data->kind == fscher || data->kind >= fschrc)
329 return sprintf(buf, "%d\n", (data->volt[index] * dmi_vref *
330 dmi_mult[index]) / 255 + dmi_offset[index]);
331 else
332 return sprintf(buf, "%d\n", (data->volt[index] *
333 max_reading[index] + 128) / 255);
334}
335
336
337#define TEMP_FROM_REG(val) (((val) - 128) * 1000)
338
339static ssize_t temp_value_show(struct device *dev,
340 struct device_attribute *devattr, char *buf)
341{
342 int index = to_sensor_dev_attr(devattr)->index;
343 struct fschmd_data *data = fschmd_update_device(dev);
344
345 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_act[index]));
346}
347
348static ssize_t temp_max_show(struct device *dev,
349 struct device_attribute *devattr, char *buf)
350{
351 int index = to_sensor_dev_attr(devattr)->index;
352 struct fschmd_data *data = fschmd_update_device(dev);
353
354 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[index]));
355}
356
357static ssize_t temp_max_store(struct device *dev,
358 struct device_attribute *devattr,
359 const char *buf, size_t count)
360{
361 int index = to_sensor_dev_attr(devattr)->index;
362 struct fschmd_data *data = dev_get_drvdata(dev);
363 long v;
364 int err;
365
366 err = kstrtol(buf, 10, &v);
367 if (err)
368 return err;
369
370 v = clamp_val(v / 1000, -128, 127) + 128;
371
372 mutex_lock(&data->update_lock);
373 i2c_smbus_write_byte_data(to_i2c_client(dev),
374 FSCHMD_REG_TEMP_LIMIT[data->kind][index], v);
375 data->temp_max[index] = v;
376 mutex_unlock(&data->update_lock);
377
378 return count;
379}
380
381static ssize_t temp_fault_show(struct device *dev,
382 struct device_attribute *devattr, char *buf)
383{
384 int index = to_sensor_dev_attr(devattr)->index;
385 struct fschmd_data *data = fschmd_update_device(dev);
386
387 /* bit 0 set means sensor working ok, so no fault! */
388 if (data->temp_status[index] & FSCHMD_TEMP_WORKING)
389 return sprintf(buf, "0\n");
390 else
391 return sprintf(buf, "1\n");
392}
393
394static ssize_t temp_alarm_show(struct device *dev,
395 struct device_attribute *devattr, char *buf)
396{
397 int index = to_sensor_dev_attr(devattr)->index;
398 struct fschmd_data *data = fschmd_update_device(dev);
399
400 if ((data->temp_status[index] & FSCHMD_TEMP_ALARM_MASK) ==
401 FSCHMD_TEMP_ALARM_MASK)
402 return sprintf(buf, "1\n");
403 else
404 return sprintf(buf, "0\n");
405}
406
407
408#define RPM_FROM_REG(val) ((val) * 60)
409
410static ssize_t fan_value_show(struct device *dev,
411 struct device_attribute *devattr, char *buf)
412{
413 int index = to_sensor_dev_attr(devattr)->index;
414 struct fschmd_data *data = fschmd_update_device(dev);
415
416 return sprintf(buf, "%u\n", RPM_FROM_REG(data->fan_act[index]));
417}
418
419static ssize_t fan_div_show(struct device *dev,
420 struct device_attribute *devattr, char *buf)
421{
422 int index = to_sensor_dev_attr(devattr)->index;
423 struct fschmd_data *data = fschmd_update_device(dev);
424
425 /* bits 2..7 reserved => mask with 3 */
426 return sprintf(buf, "%d\n", 1 << (data->fan_ripple[index] & 3));
427}
428
429static ssize_t fan_div_store(struct device *dev,
430 struct device_attribute *devattr,
431 const char *buf, size_t count)
432{
433 u8 reg;
434 int index = to_sensor_dev_attr(devattr)->index;
435 struct fschmd_data *data = dev_get_drvdata(dev);
436 /* supported values: 2, 4, 8 */
437 unsigned long v;
438 int err;
439
440 err = kstrtoul(buf, 10, &v);
441 if (err)
442 return err;
443
444 switch (v) {
445 case 2:
446 v = 1;
447 break;
448 case 4:
449 v = 2;
450 break;
451 case 8:
452 v = 3;
453 break;
454 default:
455 dev_err(dev,
456 "fan_div value %lu not supported. Choose one of 2, 4 or 8!\n",
457 v);
458 return -EINVAL;
459 }
460
461 mutex_lock(&data->update_lock);
462
463 reg = i2c_smbus_read_byte_data(to_i2c_client(dev),
464 FSCHMD_REG_FAN_RIPPLE[data->kind][index]);
465
466 /* bits 2..7 reserved => mask with 0x03 */
467 reg &= ~0x03;
468 reg |= v;
469
470 i2c_smbus_write_byte_data(to_i2c_client(dev),
471 FSCHMD_REG_FAN_RIPPLE[data->kind][index], reg);
472
473 data->fan_ripple[index] = reg;
474
475 mutex_unlock(&data->update_lock);
476
477 return count;
478}
479
480static ssize_t fan_alarm_show(struct device *dev,
481 struct device_attribute *devattr, char *buf)
482{
483 int index = to_sensor_dev_attr(devattr)->index;
484 struct fschmd_data *data = fschmd_update_device(dev);
485
486 if (data->fan_status[index] & FSCHMD_FAN_ALARM)
487 return sprintf(buf, "1\n");
488 else
489 return sprintf(buf, "0\n");
490}
491
492static ssize_t fan_fault_show(struct device *dev,
493 struct device_attribute *devattr, char *buf)
494{
495 int index = to_sensor_dev_attr(devattr)->index;
496 struct fschmd_data *data = fschmd_update_device(dev);
497
498 if (data->fan_status[index] & FSCHMD_FAN_NOT_PRESENT)
499 return sprintf(buf, "1\n");
500 else
501 return sprintf(buf, "0\n");
502}
503
504
505static ssize_t pwm_auto_point1_pwm_show(struct device *dev,
506 struct device_attribute *devattr,
507 char *buf)
508{
509 int index = to_sensor_dev_attr(devattr)->index;
510 struct fschmd_data *data = fschmd_update_device(dev);
511 int val = data->fan_min[index];
512
513 /* 0 = allow turning off (except on the syl), 1-255 = 50-100% */
514 if (val || data->kind == fscsyl)
515 val = val / 2 + 128;
516
517 return sprintf(buf, "%d\n", val);
518}
519
520static ssize_t pwm_auto_point1_pwm_store(struct device *dev,
521 struct device_attribute *devattr,
522 const char *buf, size_t count)
523{
524 int index = to_sensor_dev_attr(devattr)->index;
525 struct fschmd_data *data = dev_get_drvdata(dev);
526 unsigned long v;
527 int err;
528
529 err = kstrtoul(buf, 10, &v);
530 if (err)
531 return err;
532
533 /* reg: 0 = allow turning off (except on the syl), 1-255 = 50-100% */
534 if (v || data->kind == fscsyl) {
535 v = clamp_val(v, 128, 255);
536 v = (v - 128) * 2 + 1;
537 }
538
539 mutex_lock(&data->update_lock);
540
541 i2c_smbus_write_byte_data(to_i2c_client(dev),
542 FSCHMD_REG_FAN_MIN[data->kind][index], v);
543 data->fan_min[index] = v;
544
545 mutex_unlock(&data->update_lock);
546
547 return count;
548}
549
550
551/*
552 * The FSC hwmon family has the ability to force an attached alert led to flash
553 * from software, we export this as an alert_led sysfs attr
554 */
555static ssize_t alert_led_show(struct device *dev,
556 struct device_attribute *devattr, char *buf)
557{
558 struct fschmd_data *data = fschmd_update_device(dev);
559
560 if (data->global_control & FSCHMD_CONTROL_ALERT_LED)
561 return sprintf(buf, "1\n");
562 else
563 return sprintf(buf, "0\n");
564}
565
566static ssize_t alert_led_store(struct device *dev,
567 struct device_attribute *devattr, const char *buf, size_t count)
568{
569 u8 reg;
570 struct fschmd_data *data = dev_get_drvdata(dev);
571 unsigned long v;
572 int err;
573
574 err = kstrtoul(buf, 10, &v);
575 if (err)
576 return err;
577
578 mutex_lock(&data->update_lock);
579
580 reg = i2c_smbus_read_byte_data(to_i2c_client(dev), FSCHMD_REG_CONTROL);
581
582 if (v)
583 reg |= FSCHMD_CONTROL_ALERT_LED;
584 else
585 reg &= ~FSCHMD_CONTROL_ALERT_LED;
586
587 i2c_smbus_write_byte_data(to_i2c_client(dev), FSCHMD_REG_CONTROL, reg);
588
589 data->global_control = reg;
590
591 mutex_unlock(&data->update_lock);
592
593 return count;
594}
595
596static DEVICE_ATTR_RW(alert_led);
597
598static struct sensor_device_attribute fschmd_attr[] = {
599 SENSOR_ATTR_RO(in0_input, in_value, 0),
600 SENSOR_ATTR_RO(in1_input, in_value, 1),
601 SENSOR_ATTR_RO(in2_input, in_value, 2),
602 SENSOR_ATTR_RO(in3_input, in_value, 3),
603 SENSOR_ATTR_RO(in4_input, in_value, 4),
604 SENSOR_ATTR_RO(in5_input, in_value, 5),
605};
606
607static struct sensor_device_attribute fschmd_temp_attr[] = {
608 SENSOR_ATTR_RO(temp1_input, temp_value, 0),
609 SENSOR_ATTR_RW(temp1_max, temp_max, 0),
610 SENSOR_ATTR_RO(temp1_fault, temp_fault, 0),
611 SENSOR_ATTR_RO(temp1_alarm, temp_alarm, 0),
612 SENSOR_ATTR_RO(temp2_input, temp_value, 1),
613 SENSOR_ATTR_RW(temp2_max, temp_max, 1),
614 SENSOR_ATTR_RO(temp2_fault, temp_fault, 1),
615 SENSOR_ATTR_RO(temp2_alarm, temp_alarm, 1),
616 SENSOR_ATTR_RO(temp3_input, temp_value, 2),
617 SENSOR_ATTR_RW(temp3_max, temp_max, 2),
618 SENSOR_ATTR_RO(temp3_fault, temp_fault, 2),
619 SENSOR_ATTR_RO(temp3_alarm, temp_alarm, 2),
620 SENSOR_ATTR_RO(temp4_input, temp_value, 3),
621 SENSOR_ATTR_RW(temp4_max, temp_max, 3),
622 SENSOR_ATTR_RO(temp4_fault, temp_fault, 3),
623 SENSOR_ATTR_RO(temp4_alarm, temp_alarm, 3),
624 SENSOR_ATTR_RO(temp5_input, temp_value, 4),
625 SENSOR_ATTR_RW(temp5_max, temp_max, 4),
626 SENSOR_ATTR_RO(temp5_fault, temp_fault, 4),
627 SENSOR_ATTR_RO(temp5_alarm, temp_alarm, 4),
628 SENSOR_ATTR_RO(temp6_input, temp_value, 5),
629 SENSOR_ATTR_RW(temp6_max, temp_max, 5),
630 SENSOR_ATTR_RO(temp6_fault, temp_fault, 5),
631 SENSOR_ATTR_RO(temp6_alarm, temp_alarm, 5),
632 SENSOR_ATTR_RO(temp7_input, temp_value, 6),
633 SENSOR_ATTR_RW(temp7_max, temp_max, 6),
634 SENSOR_ATTR_RO(temp7_fault, temp_fault, 6),
635 SENSOR_ATTR_RO(temp7_alarm, temp_alarm, 6),
636 SENSOR_ATTR_RO(temp8_input, temp_value, 7),
637 SENSOR_ATTR_RW(temp8_max, temp_max, 7),
638 SENSOR_ATTR_RO(temp8_fault, temp_fault, 7),
639 SENSOR_ATTR_RO(temp8_alarm, temp_alarm, 7),
640 SENSOR_ATTR_RO(temp9_input, temp_value, 8),
641 SENSOR_ATTR_RW(temp9_max, temp_max, 8),
642 SENSOR_ATTR_RO(temp9_fault, temp_fault, 8),
643 SENSOR_ATTR_RO(temp9_alarm, temp_alarm, 8),
644 SENSOR_ATTR_RO(temp10_input, temp_value, 9),
645 SENSOR_ATTR_RW(temp10_max, temp_max, 9),
646 SENSOR_ATTR_RO(temp10_fault, temp_fault, 9),
647 SENSOR_ATTR_RO(temp10_alarm, temp_alarm, 9),
648 SENSOR_ATTR_RO(temp11_input, temp_value, 10),
649 SENSOR_ATTR_RW(temp11_max, temp_max, 10),
650 SENSOR_ATTR_RO(temp11_fault, temp_fault, 10),
651 SENSOR_ATTR_RO(temp11_alarm, temp_alarm, 10),
652};
653
654static struct sensor_device_attribute fschmd_fan_attr[] = {
655 SENSOR_ATTR_RO(fan1_input, fan_value, 0),
656 SENSOR_ATTR_RW(fan1_div, fan_div, 0),
657 SENSOR_ATTR_RO(fan1_alarm, fan_alarm, 0),
658 SENSOR_ATTR_RO(fan1_fault, fan_fault, 0),
659 SENSOR_ATTR_RW(pwm1_auto_point1_pwm, pwm_auto_point1_pwm, 0),
660 SENSOR_ATTR_RO(fan2_input, fan_value, 1),
661 SENSOR_ATTR_RW(fan2_div, fan_div, 1),
662 SENSOR_ATTR_RO(fan2_alarm, fan_alarm, 1),
663 SENSOR_ATTR_RO(fan2_fault, fan_fault, 1),
664 SENSOR_ATTR_RW(pwm2_auto_point1_pwm, pwm_auto_point1_pwm, 1),
665 SENSOR_ATTR_RO(fan3_input, fan_value, 2),
666 SENSOR_ATTR_RW(fan3_div, fan_div, 2),
667 SENSOR_ATTR_RO(fan3_alarm, fan_alarm, 2),
668 SENSOR_ATTR_RO(fan3_fault, fan_fault, 2),
669 SENSOR_ATTR_RW(pwm3_auto_point1_pwm, pwm_auto_point1_pwm, 2),
670 SENSOR_ATTR_RO(fan4_input, fan_value, 3),
671 SENSOR_ATTR_RW(fan4_div, fan_div, 3),
672 SENSOR_ATTR_RO(fan4_alarm, fan_alarm, 3),
673 SENSOR_ATTR_RO(fan4_fault, fan_fault, 3),
674 SENSOR_ATTR_RW(pwm4_auto_point1_pwm, pwm_auto_point1_pwm, 3),
675 SENSOR_ATTR_RO(fan5_input, fan_value, 4),
676 SENSOR_ATTR_RW(fan5_div, fan_div, 4),
677 SENSOR_ATTR_RO(fan5_alarm, fan_alarm, 4),
678 SENSOR_ATTR_RO(fan5_fault, fan_fault, 4),
679 SENSOR_ATTR_RW(pwm5_auto_point1_pwm, pwm_auto_point1_pwm, 4),
680 SENSOR_ATTR_RO(fan6_input, fan_value, 5),
681 SENSOR_ATTR_RW(fan6_div, fan_div, 5),
682 SENSOR_ATTR_RO(fan6_alarm, fan_alarm, 5),
683 SENSOR_ATTR_RO(fan6_fault, fan_fault, 5),
684 SENSOR_ATTR_RW(pwm6_auto_point1_pwm, pwm_auto_point1_pwm, 5),
685 SENSOR_ATTR_RO(fan7_input, fan_value, 6),
686 SENSOR_ATTR_RW(fan7_div, fan_div, 6),
687 SENSOR_ATTR_RO(fan7_alarm, fan_alarm, 6),
688 SENSOR_ATTR_RO(fan7_fault, fan_fault, 6),
689 SENSOR_ATTR_RW(pwm7_auto_point1_pwm, pwm_auto_point1_pwm, 6),
690};
691
692
693/*
694 * Watchdog routines
695 */
696
697static int watchdog_set_timeout(struct fschmd_data *data, int timeout)
698{
699 int ret, resolution;
700 int kind = data->kind + 1; /* 0-x array index -> 1-x module param */
701
702 /* 2 second or 60 second resolution? */
703 if (timeout <= 510 || kind == fscpos || kind == fscscy)
704 resolution = 2;
705 else
706 resolution = 60;
707
708 if (timeout < resolution || timeout > (resolution * 255))
709 return -EINVAL;
710
711 mutex_lock(&data->watchdog_lock);
712 if (!data->client) {
713 ret = -ENODEV;
714 goto leave;
715 }
716
717 if (resolution == 2)
718 data->watchdog_control &= ~FSCHMD_WDOG_CONTROL_RESOLUTION;
719 else
720 data->watchdog_control |= FSCHMD_WDOG_CONTROL_RESOLUTION;
721
722 data->watchdog_preset = DIV_ROUND_UP(timeout, resolution);
723
724 /* Write new timeout value */
725 i2c_smbus_write_byte_data(data->client,
726 FSCHMD_REG_WDOG_PRESET[data->kind], data->watchdog_preset);
727 /* Write new control register, do not trigger! */
728 i2c_smbus_write_byte_data(data->client,
729 FSCHMD_REG_WDOG_CONTROL[data->kind],
730 data->watchdog_control & ~FSCHMD_WDOG_CONTROL_TRIGGER);
731
732 ret = data->watchdog_preset * resolution;
733
734leave:
735 mutex_unlock(&data->watchdog_lock);
736 return ret;
737}
738
739static int watchdog_get_timeout(struct fschmd_data *data)
740{
741 int timeout;
742
743 mutex_lock(&data->watchdog_lock);
744 if (data->watchdog_control & FSCHMD_WDOG_CONTROL_RESOLUTION)
745 timeout = data->watchdog_preset * 60;
746 else
747 timeout = data->watchdog_preset * 2;
748 mutex_unlock(&data->watchdog_lock);
749
750 return timeout;
751}
752
753static int watchdog_trigger(struct fschmd_data *data)
754{
755 int ret = 0;
756
757 mutex_lock(&data->watchdog_lock);
758 if (!data->client) {
759 ret = -ENODEV;
760 goto leave;
761 }
762
763 data->watchdog_control |= FSCHMD_WDOG_CONTROL_TRIGGER;
764 i2c_smbus_write_byte_data(data->client,
765 FSCHMD_REG_WDOG_CONTROL[data->kind],
766 data->watchdog_control);
767leave:
768 mutex_unlock(&data->watchdog_lock);
769 return ret;
770}
771
772static int watchdog_stop(struct fschmd_data *data)
773{
774 int ret = 0;
775
776 mutex_lock(&data->watchdog_lock);
777 if (!data->client) {
778 ret = -ENODEV;
779 goto leave;
780 }
781
782 data->watchdog_control &= ~FSCHMD_WDOG_CONTROL_STARTED;
783 /*
784 * Don't store the stop flag in our watchdog control register copy, as
785 * its a write only bit (read always returns 0)
786 */
787 i2c_smbus_write_byte_data(data->client,
788 FSCHMD_REG_WDOG_CONTROL[data->kind],
789 data->watchdog_control | FSCHMD_WDOG_CONTROL_STOP);
790leave:
791 mutex_unlock(&data->watchdog_lock);
792 return ret;
793}
794
795static int watchdog_open(struct inode *inode, struct file *filp)
796{
797 struct fschmd_data *pos, *data = NULL;
798 int watchdog_is_open;
799
800 /*
801 * We get called from drivers/char/misc.c with misc_mtx hold, and we
802 * call misc_register() from fschmd_probe() with watchdog_data_mutex
803 * hold, as misc_register() takes the misc_mtx lock, this is a possible
804 * deadlock, so we use mutex_trylock here.
805 */
806 if (!mutex_trylock(&watchdog_data_mutex))
807 return -ERESTARTSYS;
808 list_for_each_entry(pos, &watchdog_data_list, list) {
809 if (pos->watchdog_miscdev.minor == iminor(inode)) {
810 data = pos;
811 break;
812 }
813 }
814 /* Note we can never not have found data, so we don't check for this */
815 watchdog_is_open = test_and_set_bit(0, &data->watchdog_is_open);
816 if (!watchdog_is_open)
817 kref_get(&data->kref);
818 mutex_unlock(&watchdog_data_mutex);
819
820 if (watchdog_is_open)
821 return -EBUSY;
822
823 /* Start the watchdog */
824 watchdog_trigger(data);
825 filp->private_data = data;
826
827 return stream_open(inode, filp);
828}
829
830static int watchdog_release(struct inode *inode, struct file *filp)
831{
832 struct fschmd_data *data = filp->private_data;
833
834 if (data->watchdog_expect_close) {
835 watchdog_stop(data);
836 data->watchdog_expect_close = 0;
837 } else {
838 watchdog_trigger(data);
839 dev_crit(&data->client->dev,
840 "unexpected close, not stopping watchdog!\n");
841 }
842
843 clear_bit(0, &data->watchdog_is_open);
844
845 mutex_lock(&watchdog_data_mutex);
846 kref_put(&data->kref, fschmd_release_resources);
847 mutex_unlock(&watchdog_data_mutex);
848
849 return 0;
850}
851
852static ssize_t watchdog_write(struct file *filp, const char __user *buf,
853 size_t count, loff_t *offset)
854{
855 int ret;
856 struct fschmd_data *data = filp->private_data;
857
858 if (count) {
859 if (!nowayout) {
860 size_t i;
861
862 /* Clear it in case it was set with a previous write */
863 data->watchdog_expect_close = 0;
864
865 for (i = 0; i != count; i++) {
866 char c;
867 if (get_user(c, buf + i))
868 return -EFAULT;
869 if (c == 'V')
870 data->watchdog_expect_close = 1;
871 }
872 }
873 ret = watchdog_trigger(data);
874 if (ret < 0)
875 return ret;
876 }
877 return count;
878}
879
880static long watchdog_ioctl(struct file *filp, unsigned int cmd,
881 unsigned long arg)
882{
883 struct watchdog_info ident = {
884 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
885 WDIOF_CARDRESET,
886 .identity = "FSC watchdog"
887 };
888 int i, ret = 0;
889 struct fschmd_data *data = filp->private_data;
890
891 switch (cmd) {
892 case WDIOC_GETSUPPORT:
893 ident.firmware_version = data->revision;
894 if (!nowayout)
895 ident.options |= WDIOF_MAGICCLOSE;
896 if (copy_to_user((void __user *)arg, &ident, sizeof(ident)))
897 ret = -EFAULT;
898 break;
899
900 case WDIOC_GETSTATUS:
901 ret = put_user(0, (int __user *)arg);
902 break;
903
904 case WDIOC_GETBOOTSTATUS:
905 if (data->watchdog_state & FSCHMD_WDOG_STATE_CARDRESET)
906 ret = put_user(WDIOF_CARDRESET, (int __user *)arg);
907 else
908 ret = put_user(0, (int __user *)arg);
909 break;
910
911 case WDIOC_KEEPALIVE:
912 ret = watchdog_trigger(data);
913 break;
914
915 case WDIOC_GETTIMEOUT:
916 i = watchdog_get_timeout(data);
917 ret = put_user(i, (int __user *)arg);
918 break;
919
920 case WDIOC_SETTIMEOUT:
921 if (get_user(i, (int __user *)arg)) {
922 ret = -EFAULT;
923 break;
924 }
925 ret = watchdog_set_timeout(data, i);
926 if (ret > 0)
927 ret = put_user(ret, (int __user *)arg);
928 break;
929
930 case WDIOC_SETOPTIONS:
931 if (get_user(i, (int __user *)arg)) {
932 ret = -EFAULT;
933 break;
934 }
935
936 if (i & WDIOS_DISABLECARD)
937 ret = watchdog_stop(data);
938 else if (i & WDIOS_ENABLECARD)
939 ret = watchdog_trigger(data);
940 else
941 ret = -EINVAL;
942
943 break;
944 default:
945 ret = -ENOTTY;
946 }
947 return ret;
948}
949
950static const struct file_operations watchdog_fops = {
951 .owner = THIS_MODULE,
952 .llseek = no_llseek,
953 .open = watchdog_open,
954 .release = watchdog_release,
955 .write = watchdog_write,
956 .unlocked_ioctl = watchdog_ioctl,
957};
958
959
960/*
961 * Detect, register, unregister and update device functions
962 */
963
964/*
965 * DMI decode routine to read voltage scaling factors from special DMI tables,
966 * which are available on FSC machines with an fscher or later chip.
967 */
968static void fschmd_dmi_decode(const struct dmi_header *header, void *dummy)
969{
970 int i, mult[3] = { 0 }, offset[3] = { 0 }, vref = 0, found = 0;
971
972 /*
973 * dmi code ugliness, we get passed the address of the contents of
974 * a complete DMI record, but in the form of a dmi_header pointer, in
975 * reality this address holds header->length bytes of which the header
976 * are the first 4 bytes
977 */
978 u8 *dmi_data = (u8 *)header;
979
980 /* We are looking for OEM-specific type 185 */
981 if (header->type != 185)
982 return;
983
984 /*
985 * we are looking for what Siemens calls "subtype" 19, the subtype
986 * is stored in byte 5 of the dmi block
987 */
988 if (header->length < 5 || dmi_data[4] != 19)
989 return;
990
991 /*
992 * After the subtype comes 1 unknown byte and then blocks of 5 bytes,
993 * consisting of what Siemens calls an "Entity" number, followed by
994 * 2 16-bit words in LSB first order
995 */
996 for (i = 6; (i + 4) < header->length; i += 5) {
997 /* entity 1 - 3: voltage multiplier and offset */
998 if (dmi_data[i] >= 1 && dmi_data[i] <= 3) {
999 /* Our in sensors order and the DMI order differ */
1000 const int shuffle[3] = { 1, 0, 2 };
1001 int in = shuffle[dmi_data[i] - 1];
1002
1003 /* Check for twice the same entity */
1004 if (found & (1 << in))
1005 return;
1006
1007 mult[in] = dmi_data[i + 1] | (dmi_data[i + 2] << 8);
1008 offset[in] = dmi_data[i + 3] | (dmi_data[i + 4] << 8);
1009
1010 found |= 1 << in;
1011 }
1012
1013 /* entity 7: reference voltage */
1014 if (dmi_data[i] == 7) {
1015 /* Check for twice the same entity */
1016 if (found & 0x08)
1017 return;
1018
1019 vref = dmi_data[i + 1] | (dmi_data[i + 2] << 8);
1020
1021 found |= 0x08;
1022 }
1023 }
1024
1025 if (found == 0x0F) {
1026 for (i = 0; i < 3; i++) {
1027 dmi_mult[i] = mult[i] * 10;
1028 dmi_offset[i] = offset[i] * 10;
1029 }
1030 /*
1031 * According to the docs there should be separate dmi entries
1032 * for the mult's and offsets of in3-5 of the syl, but on
1033 * my test machine these are not present
1034 */
1035 dmi_mult[3] = dmi_mult[2];
1036 dmi_mult[4] = dmi_mult[1];
1037 dmi_mult[5] = dmi_mult[2];
1038 dmi_offset[3] = dmi_offset[2];
1039 dmi_offset[4] = dmi_offset[1];
1040 dmi_offset[5] = dmi_offset[2];
1041 dmi_vref = vref;
1042 }
1043}
1044
1045static int fschmd_detect(struct i2c_client *client,
1046 struct i2c_board_info *info)
1047{
1048 enum chips kind;
1049 struct i2c_adapter *adapter = client->adapter;
1050 char id[4];
1051
1052 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
1053 return -ENODEV;
1054
1055 /* Detect & Identify the chip */
1056 id[0] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_0);
1057 id[1] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_1);
1058 id[2] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_2);
1059 id[3] = '\0';
1060
1061 if (!strcmp(id, "PEG"))
1062 kind = fscpos;
1063 else if (!strcmp(id, "HER"))
1064 kind = fscher;
1065 else if (!strcmp(id, "SCY"))
1066 kind = fscscy;
1067 else if (!strcmp(id, "HRC"))
1068 kind = fschrc;
1069 else if (!strcmp(id, "HMD"))
1070 kind = fschmd;
1071 else if (!strcmp(id, "HDS"))
1072 kind = fschds;
1073 else if (!strcmp(id, "SYL"))
1074 kind = fscsyl;
1075 else
1076 return -ENODEV;
1077
1078 strlcpy(info->type, fschmd_id[kind].name, I2C_NAME_SIZE);
1079
1080 return 0;
1081}
1082
1083static int fschmd_probe(struct i2c_client *client,
1084 const struct i2c_device_id *id)
1085{
1086 struct fschmd_data *data;
1087 const char * const names[7] = { "Poseidon", "Hermes", "Scylla",
1088 "Heracles", "Heimdall", "Hades", "Syleus" };
1089 const int watchdog_minors[] = { WATCHDOG_MINOR, 212, 213, 214, 215 };
1090 int i, err;
1091 enum chips kind = id->driver_data;
1092
1093 data = kzalloc(sizeof(struct fschmd_data), GFP_KERNEL);
1094 if (!data)
1095 return -ENOMEM;
1096
1097 i2c_set_clientdata(client, data);
1098 mutex_init(&data->update_lock);
1099 mutex_init(&data->watchdog_lock);
1100 INIT_LIST_HEAD(&data->list);
1101 kref_init(&data->kref);
1102 /*
1103 * Store client pointer in our data struct for watchdog usage
1104 * (where the client is found through a data ptr instead of the
1105 * otherway around)
1106 */
1107 data->client = client;
1108 data->kind = kind;
1109
1110 if (kind == fscpos) {
1111 /*
1112 * The Poseidon has hardwired temp limits, fill these
1113 * in for the alarm resetting code
1114 */
1115 data->temp_max[0] = 70 + 128;
1116 data->temp_max[1] = 50 + 128;
1117 data->temp_max[2] = 50 + 128;
1118 }
1119
1120 /* Read the special DMI table for fscher and newer chips */
1121 if ((kind == fscher || kind >= fschrc) && dmi_vref == -1) {
1122 dmi_walk(fschmd_dmi_decode, NULL);
1123 if (dmi_vref == -1) {
1124 dev_warn(&client->dev,
1125 "Couldn't get voltage scaling factors from "
1126 "BIOS DMI table, using builtin defaults\n");
1127 dmi_vref = 33;
1128 }
1129 }
1130
1131 /* Read in some never changing registers */
1132 data->revision = i2c_smbus_read_byte_data(client, FSCHMD_REG_REVISION);
1133 data->global_control = i2c_smbus_read_byte_data(client,
1134 FSCHMD_REG_CONTROL);
1135 data->watchdog_control = i2c_smbus_read_byte_data(client,
1136 FSCHMD_REG_WDOG_CONTROL[data->kind]);
1137 data->watchdog_state = i2c_smbus_read_byte_data(client,
1138 FSCHMD_REG_WDOG_STATE[data->kind]);
1139 data->watchdog_preset = i2c_smbus_read_byte_data(client,
1140 FSCHMD_REG_WDOG_PRESET[data->kind]);
1141
1142 err = device_create_file(&client->dev, &dev_attr_alert_led);
1143 if (err)
1144 goto exit_detach;
1145
1146 for (i = 0; i < FSCHMD_NO_VOLT_SENSORS[data->kind]; i++) {
1147 err = device_create_file(&client->dev,
1148 &fschmd_attr[i].dev_attr);
1149 if (err)
1150 goto exit_detach;
1151 }
1152
1153 for (i = 0; i < (FSCHMD_NO_TEMP_SENSORS[data->kind] * 4); i++) {
1154 /* Poseidon doesn't have TEMP_LIMIT registers */
1155 if (kind == fscpos && fschmd_temp_attr[i].dev_attr.show ==
1156 temp_max_show)
1157 continue;
1158
1159 if (kind == fscsyl) {
1160 if (i % 4 == 0)
1161 data->temp_status[i / 4] =
1162 i2c_smbus_read_byte_data(client,
1163 FSCHMD_REG_TEMP_STATE
1164 [data->kind][i / 4]);
1165 if (data->temp_status[i / 4] & FSCHMD_TEMP_DISABLED)
1166 continue;
1167 }
1168
1169 err = device_create_file(&client->dev,
1170 &fschmd_temp_attr[i].dev_attr);
1171 if (err)
1172 goto exit_detach;
1173 }
1174
1175 for (i = 0; i < (FSCHMD_NO_FAN_SENSORS[data->kind] * 5); i++) {
1176 /* Poseidon doesn't have a FAN_MIN register for its 3rd fan */
1177 if (kind == fscpos &&
1178 !strcmp(fschmd_fan_attr[i].dev_attr.attr.name,
1179 "pwm3_auto_point1_pwm"))
1180 continue;
1181
1182 if (kind == fscsyl) {
1183 if (i % 5 == 0)
1184 data->fan_status[i / 5] =
1185 i2c_smbus_read_byte_data(client,
1186 FSCHMD_REG_FAN_STATE
1187 [data->kind][i / 5]);
1188 if (data->fan_status[i / 5] & FSCHMD_FAN_DISABLED)
1189 continue;
1190 }
1191
1192 err = device_create_file(&client->dev,
1193 &fschmd_fan_attr[i].dev_attr);
1194 if (err)
1195 goto exit_detach;
1196 }
1197
1198 data->hwmon_dev = hwmon_device_register(&client->dev);
1199 if (IS_ERR(data->hwmon_dev)) {
1200 err = PTR_ERR(data->hwmon_dev);
1201 data->hwmon_dev = NULL;
1202 goto exit_detach;
1203 }
1204
1205 /*
1206 * We take the data_mutex lock early so that watchdog_open() cannot
1207 * run when misc_register() has completed, but we've not yet added
1208 * our data to the watchdog_data_list (and set the default timeout)
1209 */
1210 mutex_lock(&watchdog_data_mutex);
1211 for (i = 0; i < ARRAY_SIZE(watchdog_minors); i++) {
1212 /* Register our watchdog part */
1213 snprintf(data->watchdog_name, sizeof(data->watchdog_name),
1214 "watchdog%c", (i == 0) ? '\0' : ('0' + i));
1215 data->watchdog_miscdev.name = data->watchdog_name;
1216 data->watchdog_miscdev.fops = &watchdog_fops;
1217 data->watchdog_miscdev.minor = watchdog_minors[i];
1218 err = misc_register(&data->watchdog_miscdev);
1219 if (err == -EBUSY)
1220 continue;
1221 if (err) {
1222 data->watchdog_miscdev.minor = 0;
1223 dev_err(&client->dev,
1224 "Registering watchdog chardev: %d\n", err);
1225 break;
1226 }
1227
1228 list_add(&data->list, &watchdog_data_list);
1229 watchdog_set_timeout(data, 60);
1230 dev_info(&client->dev,
1231 "Registered watchdog chardev major 10, minor: %d\n",
1232 watchdog_minors[i]);
1233 break;
1234 }
1235 if (i == ARRAY_SIZE(watchdog_minors)) {
1236 data->watchdog_miscdev.minor = 0;
1237 dev_warn(&client->dev,
1238 "Couldn't register watchdog chardev (due to no free minor)\n");
1239 }
1240 mutex_unlock(&watchdog_data_mutex);
1241
1242 dev_info(&client->dev, "Detected FSC %s chip, revision: %d\n",
1243 names[data->kind], (int) data->revision);
1244
1245 return 0;
1246
1247exit_detach:
1248 fschmd_remove(client); /* will also free data for us */
1249 return err;
1250}
1251
1252static int fschmd_remove(struct i2c_client *client)
1253{
1254 struct fschmd_data *data = i2c_get_clientdata(client);
1255 int i;
1256
1257 /* Unregister the watchdog (if registered) */
1258 if (data->watchdog_miscdev.minor) {
1259 misc_deregister(&data->watchdog_miscdev);
1260 if (data->watchdog_is_open) {
1261 dev_warn(&client->dev,
1262 "i2c client detached with watchdog open! "
1263 "Stopping watchdog.\n");
1264 watchdog_stop(data);
1265 }
1266 mutex_lock(&watchdog_data_mutex);
1267 list_del(&data->list);
1268 mutex_unlock(&watchdog_data_mutex);
1269 /* Tell the watchdog code the client is gone */
1270 mutex_lock(&data->watchdog_lock);
1271 data->client = NULL;
1272 mutex_unlock(&data->watchdog_lock);
1273 }
1274
1275 /*
1276 * Check if registered in case we're called from fschmd_detect
1277 * to cleanup after an error
1278 */
1279 if (data->hwmon_dev)
1280 hwmon_device_unregister(data->hwmon_dev);
1281
1282 device_remove_file(&client->dev, &dev_attr_alert_led);
1283 for (i = 0; i < (FSCHMD_NO_VOLT_SENSORS[data->kind]); i++)
1284 device_remove_file(&client->dev, &fschmd_attr[i].dev_attr);
1285 for (i = 0; i < (FSCHMD_NO_TEMP_SENSORS[data->kind] * 4); i++)
1286 device_remove_file(&client->dev,
1287 &fschmd_temp_attr[i].dev_attr);
1288 for (i = 0; i < (FSCHMD_NO_FAN_SENSORS[data->kind] * 5); i++)
1289 device_remove_file(&client->dev,
1290 &fschmd_fan_attr[i].dev_attr);
1291
1292 mutex_lock(&watchdog_data_mutex);
1293 kref_put(&data->kref, fschmd_release_resources);
1294 mutex_unlock(&watchdog_data_mutex);
1295
1296 return 0;
1297}
1298
1299static struct fschmd_data *fschmd_update_device(struct device *dev)
1300{
1301 struct i2c_client *client = to_i2c_client(dev);
1302 struct fschmd_data *data = i2c_get_clientdata(client);
1303 int i;
1304
1305 mutex_lock(&data->update_lock);
1306
1307 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
1308
1309 for (i = 0; i < FSCHMD_NO_TEMP_SENSORS[data->kind]; i++) {
1310 data->temp_act[i] = i2c_smbus_read_byte_data(client,
1311 FSCHMD_REG_TEMP_ACT[data->kind][i]);
1312 data->temp_status[i] = i2c_smbus_read_byte_data(client,
1313 FSCHMD_REG_TEMP_STATE[data->kind][i]);
1314
1315 /* The fscpos doesn't have TEMP_LIMIT registers */
1316 if (FSCHMD_REG_TEMP_LIMIT[data->kind][i])
1317 data->temp_max[i] = i2c_smbus_read_byte_data(
1318 client,
1319 FSCHMD_REG_TEMP_LIMIT[data->kind][i]);
1320
1321 /*
1322 * reset alarm if the alarm condition is gone,
1323 * the chip doesn't do this itself
1324 */
1325 if ((data->temp_status[i] & FSCHMD_TEMP_ALARM_MASK) ==
1326 FSCHMD_TEMP_ALARM_MASK &&
1327 data->temp_act[i] < data->temp_max[i])
1328 i2c_smbus_write_byte_data(client,
1329 FSCHMD_REG_TEMP_STATE[data->kind][i],
1330 data->temp_status[i]);
1331 }
1332
1333 for (i = 0; i < FSCHMD_NO_FAN_SENSORS[data->kind]; i++) {
1334 data->fan_act[i] = i2c_smbus_read_byte_data(client,
1335 FSCHMD_REG_FAN_ACT[data->kind][i]);
1336 data->fan_status[i] = i2c_smbus_read_byte_data(client,
1337 FSCHMD_REG_FAN_STATE[data->kind][i]);
1338 data->fan_ripple[i] = i2c_smbus_read_byte_data(client,
1339 FSCHMD_REG_FAN_RIPPLE[data->kind][i]);
1340
1341 /* The fscpos third fan doesn't have a fan_min */
1342 if (FSCHMD_REG_FAN_MIN[data->kind][i])
1343 data->fan_min[i] = i2c_smbus_read_byte_data(
1344 client,
1345 FSCHMD_REG_FAN_MIN[data->kind][i]);
1346
1347 /* reset fan status if speed is back to > 0 */
1348 if ((data->fan_status[i] & FSCHMD_FAN_ALARM) &&
1349 data->fan_act[i])
1350 i2c_smbus_write_byte_data(client,
1351 FSCHMD_REG_FAN_STATE[data->kind][i],
1352 data->fan_status[i]);
1353 }
1354
1355 for (i = 0; i < FSCHMD_NO_VOLT_SENSORS[data->kind]; i++)
1356 data->volt[i] = i2c_smbus_read_byte_data(client,
1357 FSCHMD_REG_VOLT[data->kind][i]);
1358
1359 data->last_updated = jiffies;
1360 data->valid = 1;
1361 }
1362
1363 mutex_unlock(&data->update_lock);
1364
1365 return data;
1366}
1367
1368module_i2c_driver(fschmd_driver);
1369
1370MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
1371MODULE_DESCRIPTION("FSC Poseidon, Hermes, Scylla, Heracles, Heimdall, Hades "
1372 "and Syleus driver");
1373MODULE_LICENSE("GPL");