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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 .compat_ioctl = compat_ptr_ioctl,
958};
959
960
961/*
962 * Detect, register, unregister and update device functions
963 */
964
965/*
966 * DMI decode routine to read voltage scaling factors from special DMI tables,
967 * which are available on FSC machines with an fscher or later chip.
968 */
969static void fschmd_dmi_decode(const struct dmi_header *header, void *dummy)
970{
971 int i, mult[3] = { 0 }, offset[3] = { 0 }, vref = 0, found = 0;
972
973 /*
974 * dmi code ugliness, we get passed the address of the contents of
975 * a complete DMI record, but in the form of a dmi_header pointer, in
976 * reality this address holds header->length bytes of which the header
977 * are the first 4 bytes
978 */
979 u8 *dmi_data = (u8 *)header;
980
981 /* We are looking for OEM-specific type 185 */
982 if (header->type != 185)
983 return;
984
985 /*
986 * we are looking for what Siemens calls "subtype" 19, the subtype
987 * is stored in byte 5 of the dmi block
988 */
989 if (header->length < 5 || dmi_data[4] != 19)
990 return;
991
992 /*
993 * After the subtype comes 1 unknown byte and then blocks of 5 bytes,
994 * consisting of what Siemens calls an "Entity" number, followed by
995 * 2 16-bit words in LSB first order
996 */
997 for (i = 6; (i + 4) < header->length; i += 5) {
998 /* entity 1 - 3: voltage multiplier and offset */
999 if (dmi_data[i] >= 1 && dmi_data[i] <= 3) {
1000 /* Our in sensors order and the DMI order differ */
1001 const int shuffle[3] = { 1, 0, 2 };
1002 int in = shuffle[dmi_data[i] - 1];
1003
1004 /* Check for twice the same entity */
1005 if (found & (1 << in))
1006 return;
1007
1008 mult[in] = dmi_data[i + 1] | (dmi_data[i + 2] << 8);
1009 offset[in] = dmi_data[i + 3] | (dmi_data[i + 4] << 8);
1010
1011 found |= 1 << in;
1012 }
1013
1014 /* entity 7: reference voltage */
1015 if (dmi_data[i] == 7) {
1016 /* Check for twice the same entity */
1017 if (found & 0x08)
1018 return;
1019
1020 vref = dmi_data[i + 1] | (dmi_data[i + 2] << 8);
1021
1022 found |= 0x08;
1023 }
1024 }
1025
1026 if (found == 0x0F) {
1027 for (i = 0; i < 3; i++) {
1028 dmi_mult[i] = mult[i] * 10;
1029 dmi_offset[i] = offset[i] * 10;
1030 }
1031 /*
1032 * According to the docs there should be separate dmi entries
1033 * for the mult's and offsets of in3-5 of the syl, but on
1034 * my test machine these are not present
1035 */
1036 dmi_mult[3] = dmi_mult[2];
1037 dmi_mult[4] = dmi_mult[1];
1038 dmi_mult[5] = dmi_mult[2];
1039 dmi_offset[3] = dmi_offset[2];
1040 dmi_offset[4] = dmi_offset[1];
1041 dmi_offset[5] = dmi_offset[2];
1042 dmi_vref = vref;
1043 }
1044}
1045
1046static int fschmd_detect(struct i2c_client *client,
1047 struct i2c_board_info *info)
1048{
1049 enum chips kind;
1050 struct i2c_adapter *adapter = client->adapter;
1051 char id[4];
1052
1053 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
1054 return -ENODEV;
1055
1056 /* Detect & Identify the chip */
1057 id[0] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_0);
1058 id[1] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_1);
1059 id[2] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_2);
1060 id[3] = '\0';
1061
1062 if (!strcmp(id, "PEG"))
1063 kind = fscpos;
1064 else if (!strcmp(id, "HER"))
1065 kind = fscher;
1066 else if (!strcmp(id, "SCY"))
1067 kind = fscscy;
1068 else if (!strcmp(id, "HRC"))
1069 kind = fschrc;
1070 else if (!strcmp(id, "HMD"))
1071 kind = fschmd;
1072 else if (!strcmp(id, "HDS"))
1073 kind = fschds;
1074 else if (!strcmp(id, "SYL"))
1075 kind = fscsyl;
1076 else
1077 return -ENODEV;
1078
1079 strlcpy(info->type, fschmd_id[kind].name, I2C_NAME_SIZE);
1080
1081 return 0;
1082}
1083
1084static int fschmd_probe(struct i2c_client *client,
1085 const struct i2c_device_id *id)
1086{
1087 struct fschmd_data *data;
1088 const char * const names[7] = { "Poseidon", "Hermes", "Scylla",
1089 "Heracles", "Heimdall", "Hades", "Syleus" };
1090 const int watchdog_minors[] = { WATCHDOG_MINOR, 212, 213, 214, 215 };
1091 int i, err;
1092 enum chips kind = id->driver_data;
1093
1094 data = kzalloc(sizeof(struct fschmd_data), GFP_KERNEL);
1095 if (!data)
1096 return -ENOMEM;
1097
1098 i2c_set_clientdata(client, data);
1099 mutex_init(&data->update_lock);
1100 mutex_init(&data->watchdog_lock);
1101 INIT_LIST_HEAD(&data->list);
1102 kref_init(&data->kref);
1103 /*
1104 * Store client pointer in our data struct for watchdog usage
1105 * (where the client is found through a data ptr instead of the
1106 * otherway around)
1107 */
1108 data->client = client;
1109 data->kind = kind;
1110
1111 if (kind == fscpos) {
1112 /*
1113 * The Poseidon has hardwired temp limits, fill these
1114 * in for the alarm resetting code
1115 */
1116 data->temp_max[0] = 70 + 128;
1117 data->temp_max[1] = 50 + 128;
1118 data->temp_max[2] = 50 + 128;
1119 }
1120
1121 /* Read the special DMI table for fscher and newer chips */
1122 if ((kind == fscher || kind >= fschrc) && dmi_vref == -1) {
1123 dmi_walk(fschmd_dmi_decode, NULL);
1124 if (dmi_vref == -1) {
1125 dev_warn(&client->dev,
1126 "Couldn't get voltage scaling factors from "
1127 "BIOS DMI table, using builtin defaults\n");
1128 dmi_vref = 33;
1129 }
1130 }
1131
1132 /* Read in some never changing registers */
1133 data->revision = i2c_smbus_read_byte_data(client, FSCHMD_REG_REVISION);
1134 data->global_control = i2c_smbus_read_byte_data(client,
1135 FSCHMD_REG_CONTROL);
1136 data->watchdog_control = i2c_smbus_read_byte_data(client,
1137 FSCHMD_REG_WDOG_CONTROL[data->kind]);
1138 data->watchdog_state = i2c_smbus_read_byte_data(client,
1139 FSCHMD_REG_WDOG_STATE[data->kind]);
1140 data->watchdog_preset = i2c_smbus_read_byte_data(client,
1141 FSCHMD_REG_WDOG_PRESET[data->kind]);
1142
1143 err = device_create_file(&client->dev, &dev_attr_alert_led);
1144 if (err)
1145 goto exit_detach;
1146
1147 for (i = 0; i < FSCHMD_NO_VOLT_SENSORS[data->kind]; i++) {
1148 err = device_create_file(&client->dev,
1149 &fschmd_attr[i].dev_attr);
1150 if (err)
1151 goto exit_detach;
1152 }
1153
1154 for (i = 0; i < (FSCHMD_NO_TEMP_SENSORS[data->kind] * 4); i++) {
1155 /* Poseidon doesn't have TEMP_LIMIT registers */
1156 if (kind == fscpos && fschmd_temp_attr[i].dev_attr.show ==
1157 temp_max_show)
1158 continue;
1159
1160 if (kind == fscsyl) {
1161 if (i % 4 == 0)
1162 data->temp_status[i / 4] =
1163 i2c_smbus_read_byte_data(client,
1164 FSCHMD_REG_TEMP_STATE
1165 [data->kind][i / 4]);
1166 if (data->temp_status[i / 4] & FSCHMD_TEMP_DISABLED)
1167 continue;
1168 }
1169
1170 err = device_create_file(&client->dev,
1171 &fschmd_temp_attr[i].dev_attr);
1172 if (err)
1173 goto exit_detach;
1174 }
1175
1176 for (i = 0; i < (FSCHMD_NO_FAN_SENSORS[data->kind] * 5); i++) {
1177 /* Poseidon doesn't have a FAN_MIN register for its 3rd fan */
1178 if (kind == fscpos &&
1179 !strcmp(fschmd_fan_attr[i].dev_attr.attr.name,
1180 "pwm3_auto_point1_pwm"))
1181 continue;
1182
1183 if (kind == fscsyl) {
1184 if (i % 5 == 0)
1185 data->fan_status[i / 5] =
1186 i2c_smbus_read_byte_data(client,
1187 FSCHMD_REG_FAN_STATE
1188 [data->kind][i / 5]);
1189 if (data->fan_status[i / 5] & FSCHMD_FAN_DISABLED)
1190 continue;
1191 }
1192
1193 err = device_create_file(&client->dev,
1194 &fschmd_fan_attr[i].dev_attr);
1195 if (err)
1196 goto exit_detach;
1197 }
1198
1199 data->hwmon_dev = hwmon_device_register(&client->dev);
1200 if (IS_ERR(data->hwmon_dev)) {
1201 err = PTR_ERR(data->hwmon_dev);
1202 data->hwmon_dev = NULL;
1203 goto exit_detach;
1204 }
1205
1206 /*
1207 * We take the data_mutex lock early so that watchdog_open() cannot
1208 * run when misc_register() has completed, but we've not yet added
1209 * our data to the watchdog_data_list (and set the default timeout)
1210 */
1211 mutex_lock(&watchdog_data_mutex);
1212 for (i = 0; i < ARRAY_SIZE(watchdog_minors); i++) {
1213 /* Register our watchdog part */
1214 snprintf(data->watchdog_name, sizeof(data->watchdog_name),
1215 "watchdog%c", (i == 0) ? '\0' : ('0' + i));
1216 data->watchdog_miscdev.name = data->watchdog_name;
1217 data->watchdog_miscdev.fops = &watchdog_fops;
1218 data->watchdog_miscdev.minor = watchdog_minors[i];
1219 err = misc_register(&data->watchdog_miscdev);
1220 if (err == -EBUSY)
1221 continue;
1222 if (err) {
1223 data->watchdog_miscdev.minor = 0;
1224 dev_err(&client->dev,
1225 "Registering watchdog chardev: %d\n", err);
1226 break;
1227 }
1228
1229 list_add(&data->list, &watchdog_data_list);
1230 watchdog_set_timeout(data, 60);
1231 dev_info(&client->dev,
1232 "Registered watchdog chardev major 10, minor: %d\n",
1233 watchdog_minors[i]);
1234 break;
1235 }
1236 if (i == ARRAY_SIZE(watchdog_minors)) {
1237 data->watchdog_miscdev.minor = 0;
1238 dev_warn(&client->dev,
1239 "Couldn't register watchdog chardev (due to no free minor)\n");
1240 }
1241 mutex_unlock(&watchdog_data_mutex);
1242
1243 dev_info(&client->dev, "Detected FSC %s chip, revision: %d\n",
1244 names[data->kind], (int) data->revision);
1245
1246 return 0;
1247
1248exit_detach:
1249 fschmd_remove(client); /* will also free data for us */
1250 return err;
1251}
1252
1253static int fschmd_remove(struct i2c_client *client)
1254{
1255 struct fschmd_data *data = i2c_get_clientdata(client);
1256 int i;
1257
1258 /* Unregister the watchdog (if registered) */
1259 if (data->watchdog_miscdev.minor) {
1260 misc_deregister(&data->watchdog_miscdev);
1261 if (data->watchdog_is_open) {
1262 dev_warn(&client->dev,
1263 "i2c client detached with watchdog open! "
1264 "Stopping watchdog.\n");
1265 watchdog_stop(data);
1266 }
1267 mutex_lock(&watchdog_data_mutex);
1268 list_del(&data->list);
1269 mutex_unlock(&watchdog_data_mutex);
1270 /* Tell the watchdog code the client is gone */
1271 mutex_lock(&data->watchdog_lock);
1272 data->client = NULL;
1273 mutex_unlock(&data->watchdog_lock);
1274 }
1275
1276 /*
1277 * Check if registered in case we're called from fschmd_detect
1278 * to cleanup after an error
1279 */
1280 if (data->hwmon_dev)
1281 hwmon_device_unregister(data->hwmon_dev);
1282
1283 device_remove_file(&client->dev, &dev_attr_alert_led);
1284 for (i = 0; i < (FSCHMD_NO_VOLT_SENSORS[data->kind]); i++)
1285 device_remove_file(&client->dev, &fschmd_attr[i].dev_attr);
1286 for (i = 0; i < (FSCHMD_NO_TEMP_SENSORS[data->kind] * 4); i++)
1287 device_remove_file(&client->dev,
1288 &fschmd_temp_attr[i].dev_attr);
1289 for (i = 0; i < (FSCHMD_NO_FAN_SENSORS[data->kind] * 5); i++)
1290 device_remove_file(&client->dev,
1291 &fschmd_fan_attr[i].dev_attr);
1292
1293 mutex_lock(&watchdog_data_mutex);
1294 kref_put(&data->kref, fschmd_release_resources);
1295 mutex_unlock(&watchdog_data_mutex);
1296
1297 return 0;
1298}
1299
1300static struct fschmd_data *fschmd_update_device(struct device *dev)
1301{
1302 struct i2c_client *client = to_i2c_client(dev);
1303 struct fschmd_data *data = i2c_get_clientdata(client);
1304 int i;
1305
1306 mutex_lock(&data->update_lock);
1307
1308 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
1309
1310 for (i = 0; i < FSCHMD_NO_TEMP_SENSORS[data->kind]; i++) {
1311 data->temp_act[i] = i2c_smbus_read_byte_data(client,
1312 FSCHMD_REG_TEMP_ACT[data->kind][i]);
1313 data->temp_status[i] = i2c_smbus_read_byte_data(client,
1314 FSCHMD_REG_TEMP_STATE[data->kind][i]);
1315
1316 /* The fscpos doesn't have TEMP_LIMIT registers */
1317 if (FSCHMD_REG_TEMP_LIMIT[data->kind][i])
1318 data->temp_max[i] = i2c_smbus_read_byte_data(
1319 client,
1320 FSCHMD_REG_TEMP_LIMIT[data->kind][i]);
1321
1322 /*
1323 * reset alarm if the alarm condition is gone,
1324 * the chip doesn't do this itself
1325 */
1326 if ((data->temp_status[i] & FSCHMD_TEMP_ALARM_MASK) ==
1327 FSCHMD_TEMP_ALARM_MASK &&
1328 data->temp_act[i] < data->temp_max[i])
1329 i2c_smbus_write_byte_data(client,
1330 FSCHMD_REG_TEMP_STATE[data->kind][i],
1331 data->temp_status[i]);
1332 }
1333
1334 for (i = 0; i < FSCHMD_NO_FAN_SENSORS[data->kind]; i++) {
1335 data->fan_act[i] = i2c_smbus_read_byte_data(client,
1336 FSCHMD_REG_FAN_ACT[data->kind][i]);
1337 data->fan_status[i] = i2c_smbus_read_byte_data(client,
1338 FSCHMD_REG_FAN_STATE[data->kind][i]);
1339 data->fan_ripple[i] = i2c_smbus_read_byte_data(client,
1340 FSCHMD_REG_FAN_RIPPLE[data->kind][i]);
1341
1342 /* The fscpos third fan doesn't have a fan_min */
1343 if (FSCHMD_REG_FAN_MIN[data->kind][i])
1344 data->fan_min[i] = i2c_smbus_read_byte_data(
1345 client,
1346 FSCHMD_REG_FAN_MIN[data->kind][i]);
1347
1348 /* reset fan status if speed is back to > 0 */
1349 if ((data->fan_status[i] & FSCHMD_FAN_ALARM) &&
1350 data->fan_act[i])
1351 i2c_smbus_write_byte_data(client,
1352 FSCHMD_REG_FAN_STATE[data->kind][i],
1353 data->fan_status[i]);
1354 }
1355
1356 for (i = 0; i < FSCHMD_NO_VOLT_SENSORS[data->kind]; i++)
1357 data->volt[i] = i2c_smbus_read_byte_data(client,
1358 FSCHMD_REG_VOLT[data->kind][i]);
1359
1360 data->last_updated = jiffies;
1361 data->valid = 1;
1362 }
1363
1364 mutex_unlock(&data->update_lock);
1365
1366 return data;
1367}
1368
1369module_i2c_driver(fschmd_driver);
1370
1371MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
1372MODULE_DESCRIPTION("FSC Poseidon, Hermes, Scylla, Heracles, Heimdall, Hades "
1373 "and Syleus driver");
1374MODULE_LICENSE("GPL");
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);
218static int fschmd_detect(struct i2c_client *client,
219 struct i2c_board_info *info);
220static void fschmd_remove(struct i2c_client *client);
221static struct fschmd_data *fschmd_update_device(struct device *dev);
222
223/*
224 * Driver data (common to all clients)
225 */
226
227static const struct i2c_device_id fschmd_id[] = {
228 { "fscpos", fscpos },
229 { "fscher", fscher },
230 { "fscscy", fscscy },
231 { "fschrc", fschrc },
232 { "fschmd", fschmd },
233 { "fschds", fschds },
234 { "fscsyl", fscsyl },
235 { }
236};
237MODULE_DEVICE_TABLE(i2c, fschmd_id);
238
239static struct i2c_driver fschmd_driver = {
240 .class = I2C_CLASS_HWMON,
241 .driver = {
242 .name = "fschmd",
243 },
244 .probe = fschmd_probe,
245 .remove = fschmd_remove,
246 .id_table = fschmd_id,
247 .detect = fschmd_detect,
248 .address_list = normal_i2c,
249};
250
251/*
252 * Client data (each client gets its own)
253 */
254
255struct fschmd_data {
256 struct i2c_client *client;
257 struct device *hwmon_dev;
258 struct mutex update_lock;
259 struct mutex watchdog_lock;
260 struct list_head list; /* member of the watchdog_data_list */
261 struct kref kref;
262 struct miscdevice watchdog_miscdev;
263 enum chips kind;
264 unsigned long watchdog_is_open;
265 char watchdog_expect_close;
266 char watchdog_name[10]; /* must be unique to avoid sysfs conflict */
267 bool valid; /* false until following fields are valid */
268 unsigned long last_updated; /* in jiffies */
269
270 /* register values */
271 u8 revision; /* chip revision */
272 u8 global_control; /* global control register */
273 u8 watchdog_control; /* watchdog control register */
274 u8 watchdog_state; /* watchdog status register */
275 u8 watchdog_preset; /* watchdog counter preset on trigger val */
276 u8 volt[6]; /* voltage */
277 u8 temp_act[11]; /* temperature */
278 u8 temp_status[11]; /* status of sensor */
279 u8 temp_max[11]; /* high temp limit, notice: undocumented! */
280 u8 fan_act[7]; /* fans revolutions per second */
281 u8 fan_status[7]; /* fan status */
282 u8 fan_min[7]; /* fan min value for rps */
283 u8 fan_ripple[7]; /* divider for rps */
284};
285
286/*
287 * Global variables to hold information read from special DMI tables, which are
288 * available on FSC machines with an fscher or later chip. There is no need to
289 * protect these with a lock as they are only modified from our attach function
290 * which always gets called with the i2c-core lock held and never accessed
291 * before the attach function is done with them.
292 */
293static int dmi_mult[6] = { 490, 200, 100, 100, 200, 100 };
294static int dmi_offset[6] = { 0, 0, 0, 0, 0, 0 };
295static int dmi_vref = -1;
296
297/*
298 * Somewhat ugly :( global data pointer list with all fschmd devices, so that
299 * we can find our device data as when using misc_register there is no other
300 * method to get to ones device data from the open fop.
301 */
302static LIST_HEAD(watchdog_data_list);
303/* Note this lock not only protect list access, but also data.kref access */
304static DEFINE_MUTEX(watchdog_data_mutex);
305
306/*
307 * Release our data struct when we're detached from the i2c client *and* all
308 * references to our watchdog device are released
309 */
310static void fschmd_release_resources(struct kref *ref)
311{
312 struct fschmd_data *data = container_of(ref, struct fschmd_data, kref);
313 kfree(data);
314}
315
316/*
317 * Sysfs attr show / store functions
318 */
319
320static ssize_t in_value_show(struct device *dev,
321 struct device_attribute *devattr, char *buf)
322{
323 const int max_reading[3] = { 14200, 6600, 3300 };
324 int index = to_sensor_dev_attr(devattr)->index;
325 struct fschmd_data *data = fschmd_update_device(dev);
326
327 if (data->kind == fscher || data->kind >= fschrc)
328 return sprintf(buf, "%d\n", (data->volt[index] * dmi_vref *
329 dmi_mult[index]) / 255 + dmi_offset[index]);
330 else
331 return sprintf(buf, "%d\n", (data->volt[index] *
332 max_reading[index] + 128) / 255);
333}
334
335
336#define TEMP_FROM_REG(val) (((val) - 128) * 1000)
337
338static ssize_t temp_value_show(struct device *dev,
339 struct device_attribute *devattr, char *buf)
340{
341 int index = to_sensor_dev_attr(devattr)->index;
342 struct fschmd_data *data = fschmd_update_device(dev);
343
344 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_act[index]));
345}
346
347static ssize_t temp_max_show(struct device *dev,
348 struct device_attribute *devattr, char *buf)
349{
350 int index = to_sensor_dev_attr(devattr)->index;
351 struct fschmd_data *data = fschmd_update_device(dev);
352
353 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[index]));
354}
355
356static ssize_t temp_max_store(struct device *dev,
357 struct device_attribute *devattr,
358 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;
363 int err;
364
365 err = kstrtol(buf, 10, &v);
366 if (err)
367 return err;
368
369 v = clamp_val(v / 1000, -128, 127) + 128;
370
371 mutex_lock(&data->update_lock);
372 i2c_smbus_write_byte_data(to_i2c_client(dev),
373 FSCHMD_REG_TEMP_LIMIT[data->kind][index], v);
374 data->temp_max[index] = v;
375 mutex_unlock(&data->update_lock);
376
377 return count;
378}
379
380static ssize_t temp_fault_show(struct device *dev,
381 struct device_attribute *devattr, char *buf)
382{
383 int index = to_sensor_dev_attr(devattr)->index;
384 struct fschmd_data *data = fschmd_update_device(dev);
385
386 /* bit 0 set means sensor working ok, so no fault! */
387 if (data->temp_status[index] & FSCHMD_TEMP_WORKING)
388 return sprintf(buf, "0\n");
389 else
390 return sprintf(buf, "1\n");
391}
392
393static ssize_t temp_alarm_show(struct device *dev,
394 struct device_attribute *devattr, char *buf)
395{
396 int index = to_sensor_dev_attr(devattr)->index;
397 struct fschmd_data *data = fschmd_update_device(dev);
398
399 if ((data->temp_status[index] & FSCHMD_TEMP_ALARM_MASK) ==
400 FSCHMD_TEMP_ALARM_MASK)
401 return sprintf(buf, "1\n");
402 else
403 return sprintf(buf, "0\n");
404}
405
406
407#define RPM_FROM_REG(val) ((val) * 60)
408
409static ssize_t fan_value_show(struct device *dev,
410 struct device_attribute *devattr, char *buf)
411{
412 int index = to_sensor_dev_attr(devattr)->index;
413 struct fschmd_data *data = fschmd_update_device(dev);
414
415 return sprintf(buf, "%u\n", RPM_FROM_REG(data->fan_act[index]));
416}
417
418static ssize_t fan_div_show(struct device *dev,
419 struct device_attribute *devattr, char *buf)
420{
421 int index = to_sensor_dev_attr(devattr)->index;
422 struct fschmd_data *data = fschmd_update_device(dev);
423
424 /* bits 2..7 reserved => mask with 3 */
425 return sprintf(buf, "%d\n", 1 << (data->fan_ripple[index] & 3));
426}
427
428static ssize_t fan_div_store(struct device *dev,
429 struct device_attribute *devattr,
430 const char *buf, size_t count)
431{
432 u8 reg;
433 int index = to_sensor_dev_attr(devattr)->index;
434 struct fschmd_data *data = dev_get_drvdata(dev);
435 /* supported values: 2, 4, 8 */
436 unsigned long v;
437 int err;
438
439 err = kstrtoul(buf, 10, &v);
440 if (err)
441 return err;
442
443 switch (v) {
444 case 2:
445 v = 1;
446 break;
447 case 4:
448 v = 2;
449 break;
450 case 8:
451 v = 3;
452 break;
453 default:
454 dev_err(dev,
455 "fan_div value %lu not supported. Choose one of 2, 4 or 8!\n",
456 v);
457 return -EINVAL;
458 }
459
460 mutex_lock(&data->update_lock);
461
462 reg = i2c_smbus_read_byte_data(to_i2c_client(dev),
463 FSCHMD_REG_FAN_RIPPLE[data->kind][index]);
464
465 /* bits 2..7 reserved => mask with 0x03 */
466 reg &= ~0x03;
467 reg |= v;
468
469 i2c_smbus_write_byte_data(to_i2c_client(dev),
470 FSCHMD_REG_FAN_RIPPLE[data->kind][index], reg);
471
472 data->fan_ripple[index] = reg;
473
474 mutex_unlock(&data->update_lock);
475
476 return count;
477}
478
479static ssize_t fan_alarm_show(struct device *dev,
480 struct device_attribute *devattr, char *buf)
481{
482 int index = to_sensor_dev_attr(devattr)->index;
483 struct fschmd_data *data = fschmd_update_device(dev);
484
485 if (data->fan_status[index] & FSCHMD_FAN_ALARM)
486 return sprintf(buf, "1\n");
487 else
488 return sprintf(buf, "0\n");
489}
490
491static ssize_t fan_fault_show(struct device *dev,
492 struct device_attribute *devattr, char *buf)
493{
494 int index = to_sensor_dev_attr(devattr)->index;
495 struct fschmd_data *data = fschmd_update_device(dev);
496
497 if (data->fan_status[index] & FSCHMD_FAN_NOT_PRESENT)
498 return sprintf(buf, "1\n");
499 else
500 return sprintf(buf, "0\n");
501}
502
503
504static ssize_t pwm_auto_point1_pwm_show(struct device *dev,
505 struct device_attribute *devattr,
506 char *buf)
507{
508 int index = to_sensor_dev_attr(devattr)->index;
509 struct fschmd_data *data = fschmd_update_device(dev);
510 int val = data->fan_min[index];
511
512 /* 0 = allow turning off (except on the syl), 1-255 = 50-100% */
513 if (val || data->kind == fscsyl)
514 val = val / 2 + 128;
515
516 return sprintf(buf, "%d\n", val);
517}
518
519static ssize_t pwm_auto_point1_pwm_store(struct device *dev,
520 struct device_attribute *devattr,
521 const char *buf, size_t count)
522{
523 int index = to_sensor_dev_attr(devattr)->index;
524 struct fschmd_data *data = dev_get_drvdata(dev);
525 unsigned long v;
526 int err;
527
528 err = kstrtoul(buf, 10, &v);
529 if (err)
530 return err;
531
532 /* reg: 0 = allow turning off (except on the syl), 1-255 = 50-100% */
533 if (v || data->kind == fscsyl) {
534 v = clamp_val(v, 128, 255);
535 v = (v - 128) * 2 + 1;
536 }
537
538 mutex_lock(&data->update_lock);
539
540 i2c_smbus_write_byte_data(to_i2c_client(dev),
541 FSCHMD_REG_FAN_MIN[data->kind][index], v);
542 data->fan_min[index] = v;
543
544 mutex_unlock(&data->update_lock);
545
546 return count;
547}
548
549
550/*
551 * The FSC hwmon family has the ability to force an attached alert led to flash
552 * from software, we export this as an alert_led sysfs attr
553 */
554static ssize_t alert_led_show(struct device *dev,
555 struct device_attribute *devattr, char *buf)
556{
557 struct fschmd_data *data = fschmd_update_device(dev);
558
559 if (data->global_control & FSCHMD_CONTROL_ALERT_LED)
560 return sprintf(buf, "1\n");
561 else
562 return sprintf(buf, "0\n");
563}
564
565static ssize_t alert_led_store(struct device *dev,
566 struct device_attribute *devattr, const char *buf, size_t count)
567{
568 u8 reg;
569 struct fschmd_data *data = dev_get_drvdata(dev);
570 unsigned long v;
571 int err;
572
573 err = kstrtoul(buf, 10, &v);
574 if (err)
575 return err;
576
577 mutex_lock(&data->update_lock);
578
579 reg = i2c_smbus_read_byte_data(to_i2c_client(dev), FSCHMD_REG_CONTROL);
580
581 if (v)
582 reg |= FSCHMD_CONTROL_ALERT_LED;
583 else
584 reg &= ~FSCHMD_CONTROL_ALERT_LED;
585
586 i2c_smbus_write_byte_data(to_i2c_client(dev), FSCHMD_REG_CONTROL, reg);
587
588 data->global_control = reg;
589
590 mutex_unlock(&data->update_lock);
591
592 return count;
593}
594
595static DEVICE_ATTR_RW(alert_led);
596
597static struct sensor_device_attribute fschmd_attr[] = {
598 SENSOR_ATTR_RO(in0_input, in_value, 0),
599 SENSOR_ATTR_RO(in1_input, in_value, 1),
600 SENSOR_ATTR_RO(in2_input, in_value, 2),
601 SENSOR_ATTR_RO(in3_input, in_value, 3),
602 SENSOR_ATTR_RO(in4_input, in_value, 4),
603 SENSOR_ATTR_RO(in5_input, in_value, 5),
604};
605
606static struct sensor_device_attribute fschmd_temp_attr[] = {
607 SENSOR_ATTR_RO(temp1_input, temp_value, 0),
608 SENSOR_ATTR_RW(temp1_max, temp_max, 0),
609 SENSOR_ATTR_RO(temp1_fault, temp_fault, 0),
610 SENSOR_ATTR_RO(temp1_alarm, temp_alarm, 0),
611 SENSOR_ATTR_RO(temp2_input, temp_value, 1),
612 SENSOR_ATTR_RW(temp2_max, temp_max, 1),
613 SENSOR_ATTR_RO(temp2_fault, temp_fault, 1),
614 SENSOR_ATTR_RO(temp2_alarm, temp_alarm, 1),
615 SENSOR_ATTR_RO(temp3_input, temp_value, 2),
616 SENSOR_ATTR_RW(temp3_max, temp_max, 2),
617 SENSOR_ATTR_RO(temp3_fault, temp_fault, 2),
618 SENSOR_ATTR_RO(temp3_alarm, temp_alarm, 2),
619 SENSOR_ATTR_RO(temp4_input, temp_value, 3),
620 SENSOR_ATTR_RW(temp4_max, temp_max, 3),
621 SENSOR_ATTR_RO(temp4_fault, temp_fault, 3),
622 SENSOR_ATTR_RO(temp4_alarm, temp_alarm, 3),
623 SENSOR_ATTR_RO(temp5_input, temp_value, 4),
624 SENSOR_ATTR_RW(temp5_max, temp_max, 4),
625 SENSOR_ATTR_RO(temp5_fault, temp_fault, 4),
626 SENSOR_ATTR_RO(temp5_alarm, temp_alarm, 4),
627 SENSOR_ATTR_RO(temp6_input, temp_value, 5),
628 SENSOR_ATTR_RW(temp6_max, temp_max, 5),
629 SENSOR_ATTR_RO(temp6_fault, temp_fault, 5),
630 SENSOR_ATTR_RO(temp6_alarm, temp_alarm, 5),
631 SENSOR_ATTR_RO(temp7_input, temp_value, 6),
632 SENSOR_ATTR_RW(temp7_max, temp_max, 6),
633 SENSOR_ATTR_RO(temp7_fault, temp_fault, 6),
634 SENSOR_ATTR_RO(temp7_alarm, temp_alarm, 6),
635 SENSOR_ATTR_RO(temp8_input, temp_value, 7),
636 SENSOR_ATTR_RW(temp8_max, temp_max, 7),
637 SENSOR_ATTR_RO(temp8_fault, temp_fault, 7),
638 SENSOR_ATTR_RO(temp8_alarm, temp_alarm, 7),
639 SENSOR_ATTR_RO(temp9_input, temp_value, 8),
640 SENSOR_ATTR_RW(temp9_max, temp_max, 8),
641 SENSOR_ATTR_RO(temp9_fault, temp_fault, 8),
642 SENSOR_ATTR_RO(temp9_alarm, temp_alarm, 8),
643 SENSOR_ATTR_RO(temp10_input, temp_value, 9),
644 SENSOR_ATTR_RW(temp10_max, temp_max, 9),
645 SENSOR_ATTR_RO(temp10_fault, temp_fault, 9),
646 SENSOR_ATTR_RO(temp10_alarm, temp_alarm, 9),
647 SENSOR_ATTR_RO(temp11_input, temp_value, 10),
648 SENSOR_ATTR_RW(temp11_max, temp_max, 10),
649 SENSOR_ATTR_RO(temp11_fault, temp_fault, 10),
650 SENSOR_ATTR_RO(temp11_alarm, temp_alarm, 10),
651};
652
653static struct sensor_device_attribute fschmd_fan_attr[] = {
654 SENSOR_ATTR_RO(fan1_input, fan_value, 0),
655 SENSOR_ATTR_RW(fan1_div, fan_div, 0),
656 SENSOR_ATTR_RO(fan1_alarm, fan_alarm, 0),
657 SENSOR_ATTR_RO(fan1_fault, fan_fault, 0),
658 SENSOR_ATTR_RW(pwm1_auto_point1_pwm, pwm_auto_point1_pwm, 0),
659 SENSOR_ATTR_RO(fan2_input, fan_value, 1),
660 SENSOR_ATTR_RW(fan2_div, fan_div, 1),
661 SENSOR_ATTR_RO(fan2_alarm, fan_alarm, 1),
662 SENSOR_ATTR_RO(fan2_fault, fan_fault, 1),
663 SENSOR_ATTR_RW(pwm2_auto_point1_pwm, pwm_auto_point1_pwm, 1),
664 SENSOR_ATTR_RO(fan3_input, fan_value, 2),
665 SENSOR_ATTR_RW(fan3_div, fan_div, 2),
666 SENSOR_ATTR_RO(fan3_alarm, fan_alarm, 2),
667 SENSOR_ATTR_RO(fan3_fault, fan_fault, 2),
668 SENSOR_ATTR_RW(pwm3_auto_point1_pwm, pwm_auto_point1_pwm, 2),
669 SENSOR_ATTR_RO(fan4_input, fan_value, 3),
670 SENSOR_ATTR_RW(fan4_div, fan_div, 3),
671 SENSOR_ATTR_RO(fan4_alarm, fan_alarm, 3),
672 SENSOR_ATTR_RO(fan4_fault, fan_fault, 3),
673 SENSOR_ATTR_RW(pwm4_auto_point1_pwm, pwm_auto_point1_pwm, 3),
674 SENSOR_ATTR_RO(fan5_input, fan_value, 4),
675 SENSOR_ATTR_RW(fan5_div, fan_div, 4),
676 SENSOR_ATTR_RO(fan5_alarm, fan_alarm, 4),
677 SENSOR_ATTR_RO(fan5_fault, fan_fault, 4),
678 SENSOR_ATTR_RW(pwm5_auto_point1_pwm, pwm_auto_point1_pwm, 4),
679 SENSOR_ATTR_RO(fan6_input, fan_value, 5),
680 SENSOR_ATTR_RW(fan6_div, fan_div, 5),
681 SENSOR_ATTR_RO(fan6_alarm, fan_alarm, 5),
682 SENSOR_ATTR_RO(fan6_fault, fan_fault, 5),
683 SENSOR_ATTR_RW(pwm6_auto_point1_pwm, pwm_auto_point1_pwm, 5),
684 SENSOR_ATTR_RO(fan7_input, fan_value, 6),
685 SENSOR_ATTR_RW(fan7_div, fan_div, 6),
686 SENSOR_ATTR_RO(fan7_alarm, fan_alarm, 6),
687 SENSOR_ATTR_RO(fan7_fault, fan_fault, 6),
688 SENSOR_ATTR_RW(pwm7_auto_point1_pwm, pwm_auto_point1_pwm, 6),
689};
690
691
692/*
693 * Watchdog routines
694 */
695
696static int watchdog_set_timeout(struct fschmd_data *data, int timeout)
697{
698 int ret, resolution;
699 int kind = data->kind + 1; /* 0-x array index -> 1-x module param */
700
701 /* 2 second or 60 second resolution? */
702 if (timeout <= 510 || kind == fscpos || kind == fscscy)
703 resolution = 2;
704 else
705 resolution = 60;
706
707 if (timeout < resolution || timeout > (resolution * 255))
708 return -EINVAL;
709
710 mutex_lock(&data->watchdog_lock);
711 if (!data->client) {
712 ret = -ENODEV;
713 goto leave;
714 }
715
716 if (resolution == 2)
717 data->watchdog_control &= ~FSCHMD_WDOG_CONTROL_RESOLUTION;
718 else
719 data->watchdog_control |= FSCHMD_WDOG_CONTROL_RESOLUTION;
720
721 data->watchdog_preset = DIV_ROUND_UP(timeout, resolution);
722
723 /* Write new timeout value */
724 i2c_smbus_write_byte_data(data->client,
725 FSCHMD_REG_WDOG_PRESET[data->kind], data->watchdog_preset);
726 /* Write new control register, do not trigger! */
727 i2c_smbus_write_byte_data(data->client,
728 FSCHMD_REG_WDOG_CONTROL[data->kind],
729 data->watchdog_control & ~FSCHMD_WDOG_CONTROL_TRIGGER);
730
731 ret = data->watchdog_preset * resolution;
732
733leave:
734 mutex_unlock(&data->watchdog_lock);
735 return ret;
736}
737
738static int watchdog_get_timeout(struct fschmd_data *data)
739{
740 int timeout;
741
742 mutex_lock(&data->watchdog_lock);
743 if (data->watchdog_control & FSCHMD_WDOG_CONTROL_RESOLUTION)
744 timeout = data->watchdog_preset * 60;
745 else
746 timeout = data->watchdog_preset * 2;
747 mutex_unlock(&data->watchdog_lock);
748
749 return timeout;
750}
751
752static int watchdog_trigger(struct fschmd_data *data)
753{
754 int ret = 0;
755
756 mutex_lock(&data->watchdog_lock);
757 if (!data->client) {
758 ret = -ENODEV;
759 goto leave;
760 }
761
762 data->watchdog_control |= FSCHMD_WDOG_CONTROL_TRIGGER;
763 i2c_smbus_write_byte_data(data->client,
764 FSCHMD_REG_WDOG_CONTROL[data->kind],
765 data->watchdog_control);
766leave:
767 mutex_unlock(&data->watchdog_lock);
768 return ret;
769}
770
771static int watchdog_stop(struct fschmd_data *data)
772{
773 int ret = 0;
774
775 mutex_lock(&data->watchdog_lock);
776 if (!data->client) {
777 ret = -ENODEV;
778 goto leave;
779 }
780
781 data->watchdog_control &= ~FSCHMD_WDOG_CONTROL_STARTED;
782 /*
783 * Don't store the stop flag in our watchdog control register copy, as
784 * its a write only bit (read always returns 0)
785 */
786 i2c_smbus_write_byte_data(data->client,
787 FSCHMD_REG_WDOG_CONTROL[data->kind],
788 data->watchdog_control | FSCHMD_WDOG_CONTROL_STOP);
789leave:
790 mutex_unlock(&data->watchdog_lock);
791 return ret;
792}
793
794static int watchdog_open(struct inode *inode, struct file *filp)
795{
796 struct fschmd_data *pos, *data = NULL;
797 int watchdog_is_open;
798
799 /*
800 * We get called from drivers/char/misc.c with misc_mtx hold, and we
801 * call misc_register() from fschmd_probe() with watchdog_data_mutex
802 * hold, as misc_register() takes the misc_mtx lock, this is a possible
803 * deadlock, so we use mutex_trylock here.
804 */
805 if (!mutex_trylock(&watchdog_data_mutex))
806 return -ERESTARTSYS;
807 list_for_each_entry(pos, &watchdog_data_list, list) {
808 if (pos->watchdog_miscdev.minor == iminor(inode)) {
809 data = pos;
810 break;
811 }
812 }
813 /* Note we can never not have found data, so we don't check for this */
814 watchdog_is_open = test_and_set_bit(0, &data->watchdog_is_open);
815 if (!watchdog_is_open)
816 kref_get(&data->kref);
817 mutex_unlock(&watchdog_data_mutex);
818
819 if (watchdog_is_open)
820 return -EBUSY;
821
822 /* Start the watchdog */
823 watchdog_trigger(data);
824 filp->private_data = data;
825
826 return stream_open(inode, filp);
827}
828
829static int watchdog_release(struct inode *inode, struct file *filp)
830{
831 struct fschmd_data *data = filp->private_data;
832
833 if (data->watchdog_expect_close) {
834 watchdog_stop(data);
835 data->watchdog_expect_close = 0;
836 } else {
837 watchdog_trigger(data);
838 dev_crit(&data->client->dev,
839 "unexpected close, not stopping watchdog!\n");
840 }
841
842 clear_bit(0, &data->watchdog_is_open);
843
844 mutex_lock(&watchdog_data_mutex);
845 kref_put(&data->kref, fschmd_release_resources);
846 mutex_unlock(&watchdog_data_mutex);
847
848 return 0;
849}
850
851static ssize_t watchdog_write(struct file *filp, const char __user *buf,
852 size_t count, loff_t *offset)
853{
854 int ret;
855 struct fschmd_data *data = filp->private_data;
856
857 if (count) {
858 if (!nowayout) {
859 size_t i;
860
861 /* Clear it in case it was set with a previous write */
862 data->watchdog_expect_close = 0;
863
864 for (i = 0; i != count; i++) {
865 char c;
866 if (get_user(c, buf + i))
867 return -EFAULT;
868 if (c == 'V')
869 data->watchdog_expect_close = 1;
870 }
871 }
872 ret = watchdog_trigger(data);
873 if (ret < 0)
874 return ret;
875 }
876 return count;
877}
878
879static long watchdog_ioctl(struct file *filp, unsigned int cmd,
880 unsigned long arg)
881{
882 struct watchdog_info ident = {
883 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
884 WDIOF_CARDRESET,
885 .identity = "FSC watchdog"
886 };
887 int i, ret = 0;
888 struct fschmd_data *data = filp->private_data;
889
890 switch (cmd) {
891 case WDIOC_GETSUPPORT:
892 ident.firmware_version = data->revision;
893 if (!nowayout)
894 ident.options |= WDIOF_MAGICCLOSE;
895 if (copy_to_user((void __user *)arg, &ident, sizeof(ident)))
896 ret = -EFAULT;
897 break;
898
899 case WDIOC_GETSTATUS:
900 ret = put_user(0, (int __user *)arg);
901 break;
902
903 case WDIOC_GETBOOTSTATUS:
904 if (data->watchdog_state & FSCHMD_WDOG_STATE_CARDRESET)
905 ret = put_user(WDIOF_CARDRESET, (int __user *)arg);
906 else
907 ret = put_user(0, (int __user *)arg);
908 break;
909
910 case WDIOC_KEEPALIVE:
911 ret = watchdog_trigger(data);
912 break;
913
914 case WDIOC_GETTIMEOUT:
915 i = watchdog_get_timeout(data);
916 ret = put_user(i, (int __user *)arg);
917 break;
918
919 case WDIOC_SETTIMEOUT:
920 if (get_user(i, (int __user *)arg)) {
921 ret = -EFAULT;
922 break;
923 }
924 ret = watchdog_set_timeout(data, i);
925 if (ret > 0)
926 ret = put_user(ret, (int __user *)arg);
927 break;
928
929 case WDIOC_SETOPTIONS:
930 if (get_user(i, (int __user *)arg)) {
931 ret = -EFAULT;
932 break;
933 }
934
935 if (i & WDIOS_DISABLECARD)
936 ret = watchdog_stop(data);
937 else if (i & WDIOS_ENABLECARD)
938 ret = watchdog_trigger(data);
939 else
940 ret = -EINVAL;
941
942 break;
943 default:
944 ret = -ENOTTY;
945 }
946 return ret;
947}
948
949static const struct file_operations watchdog_fops = {
950 .owner = THIS_MODULE,
951 .llseek = no_llseek,
952 .open = watchdog_open,
953 .release = watchdog_release,
954 .write = watchdog_write,
955 .unlocked_ioctl = watchdog_ioctl,
956 .compat_ioctl = compat_ptr_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 strscpy(info->type, fschmd_id[kind].name, I2C_NAME_SIZE);
1079
1080 return 0;
1081}
1082
1083static int fschmd_probe(struct i2c_client *client)
1084{
1085 struct fschmd_data *data;
1086 static const char * const names[7] = { "Poseidon", "Hermes", "Scylla",
1087 "Heracles", "Heimdall", "Hades", "Syleus" };
1088 static const int watchdog_minors[] = { WATCHDOG_MINOR, 212, 213, 214, 215 };
1089 int i, err;
1090 enum chips kind = i2c_match_id(fschmd_id, client)->driver_data;
1091
1092 data = kzalloc(sizeof(struct fschmd_data), GFP_KERNEL);
1093 if (!data)
1094 return -ENOMEM;
1095
1096 i2c_set_clientdata(client, data);
1097 mutex_init(&data->update_lock);
1098 mutex_init(&data->watchdog_lock);
1099 INIT_LIST_HEAD(&data->list);
1100 kref_init(&data->kref);
1101 /*
1102 * Store client pointer in our data struct for watchdog usage
1103 * (where the client is found through a data ptr instead of the
1104 * otherway around)
1105 */
1106 data->client = client;
1107 data->kind = kind;
1108
1109 if (kind == fscpos) {
1110 /*
1111 * The Poseidon has hardwired temp limits, fill these
1112 * in for the alarm resetting code
1113 */
1114 data->temp_max[0] = 70 + 128;
1115 data->temp_max[1] = 50 + 128;
1116 data->temp_max[2] = 50 + 128;
1117 }
1118
1119 /* Read the special DMI table for fscher and newer chips */
1120 if ((kind == fscher || kind >= fschrc) && dmi_vref == -1) {
1121 dmi_walk(fschmd_dmi_decode, NULL);
1122 if (dmi_vref == -1) {
1123 dev_warn(&client->dev,
1124 "Couldn't get voltage scaling factors from "
1125 "BIOS DMI table, using builtin defaults\n");
1126 dmi_vref = 33;
1127 }
1128 }
1129
1130 /* Read in some never changing registers */
1131 data->revision = i2c_smbus_read_byte_data(client, FSCHMD_REG_REVISION);
1132 data->global_control = i2c_smbus_read_byte_data(client,
1133 FSCHMD_REG_CONTROL);
1134 data->watchdog_control = i2c_smbus_read_byte_data(client,
1135 FSCHMD_REG_WDOG_CONTROL[data->kind]);
1136 data->watchdog_state = i2c_smbus_read_byte_data(client,
1137 FSCHMD_REG_WDOG_STATE[data->kind]);
1138 data->watchdog_preset = i2c_smbus_read_byte_data(client,
1139 FSCHMD_REG_WDOG_PRESET[data->kind]);
1140
1141 err = device_create_file(&client->dev, &dev_attr_alert_led);
1142 if (err)
1143 goto exit_detach;
1144
1145 for (i = 0; i < FSCHMD_NO_VOLT_SENSORS[data->kind]; i++) {
1146 err = device_create_file(&client->dev,
1147 &fschmd_attr[i].dev_attr);
1148 if (err)
1149 goto exit_detach;
1150 }
1151
1152 for (i = 0; i < (FSCHMD_NO_TEMP_SENSORS[data->kind] * 4); i++) {
1153 /* Poseidon doesn't have TEMP_LIMIT registers */
1154 if (kind == fscpos && fschmd_temp_attr[i].dev_attr.show ==
1155 temp_max_show)
1156 continue;
1157
1158 if (kind == fscsyl) {
1159 if (i % 4 == 0)
1160 data->temp_status[i / 4] =
1161 i2c_smbus_read_byte_data(client,
1162 FSCHMD_REG_TEMP_STATE
1163 [data->kind][i / 4]);
1164 if (data->temp_status[i / 4] & FSCHMD_TEMP_DISABLED)
1165 continue;
1166 }
1167
1168 err = device_create_file(&client->dev,
1169 &fschmd_temp_attr[i].dev_attr);
1170 if (err)
1171 goto exit_detach;
1172 }
1173
1174 for (i = 0; i < (FSCHMD_NO_FAN_SENSORS[data->kind] * 5); i++) {
1175 /* Poseidon doesn't have a FAN_MIN register for its 3rd fan */
1176 if (kind == fscpos &&
1177 !strcmp(fschmd_fan_attr[i].dev_attr.attr.name,
1178 "pwm3_auto_point1_pwm"))
1179 continue;
1180
1181 if (kind == fscsyl) {
1182 if (i % 5 == 0)
1183 data->fan_status[i / 5] =
1184 i2c_smbus_read_byte_data(client,
1185 FSCHMD_REG_FAN_STATE
1186 [data->kind][i / 5]);
1187 if (data->fan_status[i / 5] & FSCHMD_FAN_DISABLED)
1188 continue;
1189 }
1190
1191 err = device_create_file(&client->dev,
1192 &fschmd_fan_attr[i].dev_attr);
1193 if (err)
1194 goto exit_detach;
1195 }
1196
1197 data->hwmon_dev = hwmon_device_register(&client->dev);
1198 if (IS_ERR(data->hwmon_dev)) {
1199 err = PTR_ERR(data->hwmon_dev);
1200 data->hwmon_dev = NULL;
1201 goto exit_detach;
1202 }
1203
1204 /*
1205 * We take the data_mutex lock early so that watchdog_open() cannot
1206 * run when misc_register() has completed, but we've not yet added
1207 * our data to the watchdog_data_list (and set the default timeout)
1208 */
1209 mutex_lock(&watchdog_data_mutex);
1210 for (i = 0; i < ARRAY_SIZE(watchdog_minors); i++) {
1211 /* Register our watchdog part */
1212 snprintf(data->watchdog_name, sizeof(data->watchdog_name),
1213 "watchdog%c", (i == 0) ? '\0' : ('0' + i));
1214 data->watchdog_miscdev.name = data->watchdog_name;
1215 data->watchdog_miscdev.fops = &watchdog_fops;
1216 data->watchdog_miscdev.minor = watchdog_minors[i];
1217 err = misc_register(&data->watchdog_miscdev);
1218 if (err == -EBUSY)
1219 continue;
1220 if (err) {
1221 data->watchdog_miscdev.minor = 0;
1222 dev_err(&client->dev,
1223 "Registering watchdog chardev: %d\n", err);
1224 break;
1225 }
1226
1227 list_add(&data->list, &watchdog_data_list);
1228 watchdog_set_timeout(data, 60);
1229 dev_info(&client->dev,
1230 "Registered watchdog chardev major 10, minor: %d\n",
1231 watchdog_minors[i]);
1232 break;
1233 }
1234 if (i == ARRAY_SIZE(watchdog_minors)) {
1235 data->watchdog_miscdev.minor = 0;
1236 dev_warn(&client->dev,
1237 "Couldn't register watchdog chardev (due to no free minor)\n");
1238 }
1239 mutex_unlock(&watchdog_data_mutex);
1240
1241 dev_info(&client->dev, "Detected FSC %s chip, revision: %d\n",
1242 names[data->kind], (int) data->revision);
1243
1244 return 0;
1245
1246exit_detach:
1247 fschmd_remove(client); /* will also free data for us */
1248 return err;
1249}
1250
1251static void fschmd_remove(struct i2c_client *client)
1252{
1253 struct fschmd_data *data = i2c_get_clientdata(client);
1254 int i;
1255
1256 /* Unregister the watchdog (if registered) */
1257 if (data->watchdog_miscdev.minor) {
1258 misc_deregister(&data->watchdog_miscdev);
1259 if (data->watchdog_is_open) {
1260 dev_warn(&client->dev,
1261 "i2c client detached with watchdog open! "
1262 "Stopping watchdog.\n");
1263 watchdog_stop(data);
1264 }
1265 mutex_lock(&watchdog_data_mutex);
1266 list_del(&data->list);
1267 mutex_unlock(&watchdog_data_mutex);
1268 /* Tell the watchdog code the client is gone */
1269 mutex_lock(&data->watchdog_lock);
1270 data->client = NULL;
1271 mutex_unlock(&data->watchdog_lock);
1272 }
1273
1274 /*
1275 * Check if registered in case we're called from fschmd_detect
1276 * to cleanup after an error
1277 */
1278 if (data->hwmon_dev)
1279 hwmon_device_unregister(data->hwmon_dev);
1280
1281 device_remove_file(&client->dev, &dev_attr_alert_led);
1282 for (i = 0; i < (FSCHMD_NO_VOLT_SENSORS[data->kind]); i++)
1283 device_remove_file(&client->dev, &fschmd_attr[i].dev_attr);
1284 for (i = 0; i < (FSCHMD_NO_TEMP_SENSORS[data->kind] * 4); i++)
1285 device_remove_file(&client->dev,
1286 &fschmd_temp_attr[i].dev_attr);
1287 for (i = 0; i < (FSCHMD_NO_FAN_SENSORS[data->kind] * 5); i++)
1288 device_remove_file(&client->dev,
1289 &fschmd_fan_attr[i].dev_attr);
1290
1291 mutex_lock(&watchdog_data_mutex);
1292 kref_put(&data->kref, fschmd_release_resources);
1293 mutex_unlock(&watchdog_data_mutex);
1294}
1295
1296static struct fschmd_data *fschmd_update_device(struct device *dev)
1297{
1298 struct i2c_client *client = to_i2c_client(dev);
1299 struct fschmd_data *data = i2c_get_clientdata(client);
1300 int i;
1301
1302 mutex_lock(&data->update_lock);
1303
1304 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
1305
1306 for (i = 0; i < FSCHMD_NO_TEMP_SENSORS[data->kind]; i++) {
1307 data->temp_act[i] = i2c_smbus_read_byte_data(client,
1308 FSCHMD_REG_TEMP_ACT[data->kind][i]);
1309 data->temp_status[i] = i2c_smbus_read_byte_data(client,
1310 FSCHMD_REG_TEMP_STATE[data->kind][i]);
1311
1312 /* The fscpos doesn't have TEMP_LIMIT registers */
1313 if (FSCHMD_REG_TEMP_LIMIT[data->kind][i])
1314 data->temp_max[i] = i2c_smbus_read_byte_data(
1315 client,
1316 FSCHMD_REG_TEMP_LIMIT[data->kind][i]);
1317
1318 /*
1319 * reset alarm if the alarm condition is gone,
1320 * the chip doesn't do this itself
1321 */
1322 if ((data->temp_status[i] & FSCHMD_TEMP_ALARM_MASK) ==
1323 FSCHMD_TEMP_ALARM_MASK &&
1324 data->temp_act[i] < data->temp_max[i])
1325 i2c_smbus_write_byte_data(client,
1326 FSCHMD_REG_TEMP_STATE[data->kind][i],
1327 data->temp_status[i]);
1328 }
1329
1330 for (i = 0; i < FSCHMD_NO_FAN_SENSORS[data->kind]; i++) {
1331 data->fan_act[i] = i2c_smbus_read_byte_data(client,
1332 FSCHMD_REG_FAN_ACT[data->kind][i]);
1333 data->fan_status[i] = i2c_smbus_read_byte_data(client,
1334 FSCHMD_REG_FAN_STATE[data->kind][i]);
1335 data->fan_ripple[i] = i2c_smbus_read_byte_data(client,
1336 FSCHMD_REG_FAN_RIPPLE[data->kind][i]);
1337
1338 /* The fscpos third fan doesn't have a fan_min */
1339 if (FSCHMD_REG_FAN_MIN[data->kind][i])
1340 data->fan_min[i] = i2c_smbus_read_byte_data(
1341 client,
1342 FSCHMD_REG_FAN_MIN[data->kind][i]);
1343
1344 /* reset fan status if speed is back to > 0 */
1345 if ((data->fan_status[i] & FSCHMD_FAN_ALARM) &&
1346 data->fan_act[i])
1347 i2c_smbus_write_byte_data(client,
1348 FSCHMD_REG_FAN_STATE[data->kind][i],
1349 data->fan_status[i]);
1350 }
1351
1352 for (i = 0; i < FSCHMD_NO_VOLT_SENSORS[data->kind]; i++)
1353 data->volt[i] = i2c_smbus_read_byte_data(client,
1354 FSCHMD_REG_VOLT[data->kind][i]);
1355
1356 data->last_updated = jiffies;
1357 data->valid = true;
1358 }
1359
1360 mutex_unlock(&data->update_lock);
1361
1362 return data;
1363}
1364
1365module_i2c_driver(fschmd_driver);
1366
1367MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
1368MODULE_DESCRIPTION("FSC Poseidon, Hermes, Scylla, Heracles, Heimdall, Hades "
1369 "and Syleus driver");
1370MODULE_LICENSE("GPL");