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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/*
2 * fschmd.c
3 *
4 * Copyright (C) 2007 - 2009 Hans de Goede <hdegoede@redhat.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21/*
22 * Merged Fujitsu Siemens hwmon driver, supporting the Poseidon, Hermes,
23 * Scylla, Heracles, Heimdall, Hades and Syleus chips
24 *
25 * Based on the original 2.4 fscscy, 2.6 fscpos, 2.6 fscher and 2.6
26 * (candidate) fschmd drivers:
27 * Copyright (C) 2006 Thilo Cestonaro
28 * <thilo.cestonaro.external@fujitsu-siemens.com>
29 * Copyright (C) 2004, 2005 Stefan Ott <stefan@desire.ch>
30 * Copyright (C) 2003, 2004 Reinhard Nissl <rnissl@gmx.de>
31 * Copyright (c) 2001 Martin Knoblauch <mkn@teraport.de, knobi@knobisoft.de>
32 * Copyright (C) 2000 Hermann Jung <hej@odn.de>
33 */
34
35#include <linux/module.h>
36#include <linux/init.h>
37#include <linux/slab.h>
38#include <linux/jiffies.h>
39#include <linux/i2c.h>
40#include <linux/hwmon.h>
41#include <linux/hwmon-sysfs.h>
42#include <linux/err.h>
43#include <linux/mutex.h>
44#include <linux/sysfs.h>
45#include <linux/dmi.h>
46#include <linux/fs.h>
47#include <linux/watchdog.h>
48#include <linux/miscdevice.h>
49#include <linux/uaccess.h>
50#include <linux/kref.h>
51
52/* Addresses to scan */
53static const unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };
54
55/* Insmod parameters */
56static bool nowayout = WATCHDOG_NOWAYOUT;
57module_param(nowayout, bool, 0);
58MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
59 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
60
61enum chips { fscpos, fscher, fscscy, fschrc, fschmd, fschds, fscsyl };
62
63/*
64 * The FSCHMD registers and other defines
65 */
66
67/* chip identification */
68#define FSCHMD_REG_IDENT_0 0x00
69#define FSCHMD_REG_IDENT_1 0x01
70#define FSCHMD_REG_IDENT_2 0x02
71#define FSCHMD_REG_REVISION 0x03
72
73/* global control and status */
74#define FSCHMD_REG_EVENT_STATE 0x04
75#define FSCHMD_REG_CONTROL 0x05
76
77#define FSCHMD_CONTROL_ALERT_LED 0x01
78
79/* watchdog */
80static const u8 FSCHMD_REG_WDOG_CONTROL[7] = {
81 0x21, 0x21, 0x21, 0x21, 0x21, 0x28, 0x28 };
82static const u8 FSCHMD_REG_WDOG_STATE[7] = {
83 0x23, 0x23, 0x23, 0x23, 0x23, 0x29, 0x29 };
84static const u8 FSCHMD_REG_WDOG_PRESET[7] = {
85 0x28, 0x28, 0x28, 0x28, 0x28, 0x2a, 0x2a };
86
87#define FSCHMD_WDOG_CONTROL_TRIGGER 0x10
88#define FSCHMD_WDOG_CONTROL_STARTED 0x10 /* the same as trigger */
89#define FSCHMD_WDOG_CONTROL_STOP 0x20
90#define FSCHMD_WDOG_CONTROL_RESOLUTION 0x40
91
92#define FSCHMD_WDOG_STATE_CARDRESET 0x02
93
94/* voltages, weird order is to keep the same order as the old drivers */
95static const u8 FSCHMD_REG_VOLT[7][6] = {
96 { 0x45, 0x42, 0x48 }, /* pos */
97 { 0x45, 0x42, 0x48 }, /* her */
98 { 0x45, 0x42, 0x48 }, /* scy */
99 { 0x45, 0x42, 0x48 }, /* hrc */
100 { 0x45, 0x42, 0x48 }, /* hmd */
101 { 0x21, 0x20, 0x22 }, /* hds */
102 { 0x21, 0x20, 0x22, 0x23, 0x24, 0x25 }, /* syl */
103};
104
105static const int FSCHMD_NO_VOLT_SENSORS[7] = { 3, 3, 3, 3, 3, 3, 6 };
106
107/*
108 * minimum pwm at which the fan is driven (pwm can by increased depending on
109 * the temp. Notice that for the scy some fans share there minimum speed.
110 * Also notice that with the scy the sensor order is different than with the
111 * other chips, this order was in the 2.4 driver and kept for consistency.
112 */
113static const u8 FSCHMD_REG_FAN_MIN[7][7] = {
114 { 0x55, 0x65 }, /* pos */
115 { 0x55, 0x65, 0xb5 }, /* her */
116 { 0x65, 0x65, 0x55, 0xa5, 0x55, 0xa5 }, /* scy */
117 { 0x55, 0x65, 0xa5, 0xb5 }, /* hrc */
118 { 0x55, 0x65, 0xa5, 0xb5, 0xc5 }, /* hmd */
119 { 0x55, 0x65, 0xa5, 0xb5, 0xc5 }, /* hds */
120 { 0x54, 0x64, 0x74, 0x84, 0x94, 0xa4, 0xb4 }, /* syl */
121};
122
123/* actual fan speed */
124static const u8 FSCHMD_REG_FAN_ACT[7][7] = {
125 { 0x0e, 0x6b, 0xab }, /* pos */
126 { 0x0e, 0x6b, 0xbb }, /* her */
127 { 0x6b, 0x6c, 0x0e, 0xab, 0x5c, 0xbb }, /* scy */
128 { 0x0e, 0x6b, 0xab, 0xbb }, /* hrc */
129 { 0x5b, 0x6b, 0xab, 0xbb, 0xcb }, /* hmd */
130 { 0x5b, 0x6b, 0xab, 0xbb, 0xcb }, /* hds */
131 { 0x57, 0x67, 0x77, 0x87, 0x97, 0xa7, 0xb7 }, /* syl */
132};
133
134/* fan status registers */
135static const u8 FSCHMD_REG_FAN_STATE[7][7] = {
136 { 0x0d, 0x62, 0xa2 }, /* pos */
137 { 0x0d, 0x62, 0xb2 }, /* her */
138 { 0x62, 0x61, 0x0d, 0xa2, 0x52, 0xb2 }, /* scy */
139 { 0x0d, 0x62, 0xa2, 0xb2 }, /* hrc */
140 { 0x52, 0x62, 0xa2, 0xb2, 0xc2 }, /* hmd */
141 { 0x52, 0x62, 0xa2, 0xb2, 0xc2 }, /* hds */
142 { 0x50, 0x60, 0x70, 0x80, 0x90, 0xa0, 0xb0 }, /* syl */
143};
144
145/* fan ripple / divider registers */
146static const u8 FSCHMD_REG_FAN_RIPPLE[7][7] = {
147 { 0x0f, 0x6f, 0xaf }, /* pos */
148 { 0x0f, 0x6f, 0xbf }, /* her */
149 { 0x6f, 0x6f, 0x0f, 0xaf, 0x0f, 0xbf }, /* scy */
150 { 0x0f, 0x6f, 0xaf, 0xbf }, /* hrc */
151 { 0x5f, 0x6f, 0xaf, 0xbf, 0xcf }, /* hmd */
152 { 0x5f, 0x6f, 0xaf, 0xbf, 0xcf }, /* hds */
153 { 0x56, 0x66, 0x76, 0x86, 0x96, 0xa6, 0xb6 }, /* syl */
154};
155
156static const int FSCHMD_NO_FAN_SENSORS[7] = { 3, 3, 6, 4, 5, 5, 7 };
157
158/* Fan status register bitmasks */
159#define FSCHMD_FAN_ALARM 0x04 /* called fault by FSC! */
160#define FSCHMD_FAN_NOT_PRESENT 0x08
161#define FSCHMD_FAN_DISABLED 0x80
162
163
164/* actual temperature registers */
165static const u8 FSCHMD_REG_TEMP_ACT[7][11] = {
166 { 0x64, 0x32, 0x35 }, /* pos */
167 { 0x64, 0x32, 0x35 }, /* her */
168 { 0x64, 0xD0, 0x32, 0x35 }, /* scy */
169 { 0x64, 0x32, 0x35 }, /* hrc */
170 { 0x70, 0x80, 0x90, 0xd0, 0xe0 }, /* hmd */
171 { 0x70, 0x80, 0x90, 0xd0, 0xe0 }, /* hds */
172 { 0x58, 0x68, 0x78, 0x88, 0x98, 0xa8, /* syl */
173 0xb8, 0xc8, 0xd8, 0xe8, 0xf8 },
174};
175
176/* temperature state registers */
177static const u8 FSCHMD_REG_TEMP_STATE[7][11] = {
178 { 0x71, 0x81, 0x91 }, /* pos */
179 { 0x71, 0x81, 0x91 }, /* her */
180 { 0x71, 0xd1, 0x81, 0x91 }, /* scy */
181 { 0x71, 0x81, 0x91 }, /* hrc */
182 { 0x71, 0x81, 0x91, 0xd1, 0xe1 }, /* hmd */
183 { 0x71, 0x81, 0x91, 0xd1, 0xe1 }, /* hds */
184 { 0x59, 0x69, 0x79, 0x89, 0x99, 0xa9, /* syl */
185 0xb9, 0xc9, 0xd9, 0xe9, 0xf9 },
186};
187
188/*
189 * temperature high limit registers, FSC does not document these. Proven to be
190 * there with field testing on the fscher and fschrc, already supported / used
191 * in the fscscy 2.4 driver. FSC has confirmed that the fschmd has registers
192 * at these addresses, but doesn't want to confirm they are the same as with
193 * the fscher??
194 */
195static const u8 FSCHMD_REG_TEMP_LIMIT[7][11] = {
196 { 0, 0, 0 }, /* pos */
197 { 0x76, 0x86, 0x96 }, /* her */
198 { 0x76, 0xd6, 0x86, 0x96 }, /* scy */
199 { 0x76, 0x86, 0x96 }, /* hrc */
200 { 0x76, 0x86, 0x96, 0xd6, 0xe6 }, /* hmd */
201 { 0x76, 0x86, 0x96, 0xd6, 0xe6 }, /* hds */
202 { 0x5a, 0x6a, 0x7a, 0x8a, 0x9a, 0xaa, /* syl */
203 0xba, 0xca, 0xda, 0xea, 0xfa },
204};
205
206/*
207 * These were found through experimenting with an fscher, currently they are
208 * not used, but we keep them around for future reference.
209 * On the fscsyl AUTOP1 lives at 0x#c (so 0x5c for fan1, 0x6c for fan2, etc),
210 * AUTOP2 lives at 0x#e, and 0x#1 is a bitmask defining which temps influence
211 * the fan speed.
212 * static const u8 FSCHER_REG_TEMP_AUTOP1[] = { 0x73, 0x83, 0x93 };
213 * static const u8 FSCHER_REG_TEMP_AUTOP2[] = { 0x75, 0x85, 0x95 };
214 */
215
216static const int FSCHMD_NO_TEMP_SENSORS[7] = { 3, 3, 4, 3, 5, 5, 11 };
217
218/* temp status register bitmasks */
219#define FSCHMD_TEMP_WORKING 0x01
220#define FSCHMD_TEMP_ALERT 0x02
221#define FSCHMD_TEMP_DISABLED 0x80
222/* there only really is an alarm if the sensor is working and alert == 1 */
223#define FSCHMD_TEMP_ALARM_MASK \
224 (FSCHMD_TEMP_WORKING | FSCHMD_TEMP_ALERT)
225
226/*
227 * Functions declarations
228 */
229
230static int fschmd_probe(struct i2c_client *client,
231 const struct i2c_device_id *id);
232static int fschmd_detect(struct i2c_client *client,
233 struct i2c_board_info *info);
234static int fschmd_remove(struct i2c_client *client);
235static struct fschmd_data *fschmd_update_device(struct device *dev);
236
237/*
238 * Driver data (common to all clients)
239 */
240
241static const struct i2c_device_id fschmd_id[] = {
242 { "fscpos", fscpos },
243 { "fscher", fscher },
244 { "fscscy", fscscy },
245 { "fschrc", fschrc },
246 { "fschmd", fschmd },
247 { "fschds", fschds },
248 { "fscsyl", fscsyl },
249 { }
250};
251MODULE_DEVICE_TABLE(i2c, fschmd_id);
252
253static struct i2c_driver fschmd_driver = {
254 .class = I2C_CLASS_HWMON,
255 .driver = {
256 .name = "fschmd",
257 },
258 .probe = fschmd_probe,
259 .remove = fschmd_remove,
260 .id_table = fschmd_id,
261 .detect = fschmd_detect,
262 .address_list = normal_i2c,
263};
264
265/*
266 * Client data (each client gets its own)
267 */
268
269struct fschmd_data {
270 struct i2c_client *client;
271 struct device *hwmon_dev;
272 struct mutex update_lock;
273 struct mutex watchdog_lock;
274 struct list_head list; /* member of the watchdog_data_list */
275 struct kref kref;
276 struct miscdevice watchdog_miscdev;
277 enum chips kind;
278 unsigned long watchdog_is_open;
279 char watchdog_expect_close;
280 char watchdog_name[10]; /* must be unique to avoid sysfs conflict */
281 char valid; /* zero until following fields are valid */
282 unsigned long last_updated; /* in jiffies */
283
284 /* register values */
285 u8 revision; /* chip revision */
286 u8 global_control; /* global control register */
287 u8 watchdog_control; /* watchdog control register */
288 u8 watchdog_state; /* watchdog status register */
289 u8 watchdog_preset; /* watchdog counter preset on trigger val */
290 u8 volt[6]; /* voltage */
291 u8 temp_act[11]; /* temperature */
292 u8 temp_status[11]; /* status of sensor */
293 u8 temp_max[11]; /* high temp limit, notice: undocumented! */
294 u8 fan_act[7]; /* fans revolutions per second */
295 u8 fan_status[7]; /* fan status */
296 u8 fan_min[7]; /* fan min value for rps */
297 u8 fan_ripple[7]; /* divider for rps */
298};
299
300/*
301 * Global variables to hold information read from special DMI tables, which are
302 * available on FSC machines with an fscher or later chip. There is no need to
303 * protect these with a lock as they are only modified from our attach function
304 * which always gets called with the i2c-core lock held and never accessed
305 * before the attach function is done with them.
306 */
307static int dmi_mult[6] = { 490, 200, 100, 100, 200, 100 };
308static int dmi_offset[6] = { 0, 0, 0, 0, 0, 0 };
309static int dmi_vref = -1;
310
311/*
312 * Somewhat ugly :( global data pointer list with all fschmd devices, so that
313 * we can find our device data as when using misc_register there is no other
314 * method to get to ones device data from the open fop.
315 */
316static LIST_HEAD(watchdog_data_list);
317/* Note this lock not only protect list access, but also data.kref access */
318static DEFINE_MUTEX(watchdog_data_mutex);
319
320/*
321 * Release our data struct when we're detached from the i2c client *and* all
322 * references to our watchdog device are released
323 */
324static void fschmd_release_resources(struct kref *ref)
325{
326 struct fschmd_data *data = container_of(ref, struct fschmd_data, kref);
327 kfree(data);
328}
329
330/*
331 * Sysfs attr show / store functions
332 */
333
334static ssize_t show_in_value(struct device *dev,
335 struct device_attribute *devattr, char *buf)
336{
337 const int max_reading[3] = { 14200, 6600, 3300 };
338 int index = to_sensor_dev_attr(devattr)->index;
339 struct fschmd_data *data = fschmd_update_device(dev);
340
341 if (data->kind == fscher || data->kind >= fschrc)
342 return sprintf(buf, "%d\n", (data->volt[index] * dmi_vref *
343 dmi_mult[index]) / 255 + dmi_offset[index]);
344 else
345 return sprintf(buf, "%d\n", (data->volt[index] *
346 max_reading[index] + 128) / 255);
347}
348
349
350#define TEMP_FROM_REG(val) (((val) - 128) * 1000)
351
352static ssize_t show_temp_value(struct device *dev,
353 struct device_attribute *devattr, char *buf)
354{
355 int index = to_sensor_dev_attr(devattr)->index;
356 struct fschmd_data *data = fschmd_update_device(dev);
357
358 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_act[index]));
359}
360
361static ssize_t show_temp_max(struct device *dev,
362 struct device_attribute *devattr, char *buf)
363{
364 int index = to_sensor_dev_attr(devattr)->index;
365 struct fschmd_data *data = fschmd_update_device(dev);
366
367 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[index]));
368}
369
370static ssize_t store_temp_max(struct device *dev, struct device_attribute
371 *devattr, const char *buf, size_t count)
372{
373 int index = to_sensor_dev_attr(devattr)->index;
374 struct fschmd_data *data = dev_get_drvdata(dev);
375 long v;
376 int err;
377
378 err = kstrtol(buf, 10, &v);
379 if (err)
380 return err;
381
382 v = clamp_val(v / 1000, -128, 127) + 128;
383
384 mutex_lock(&data->update_lock);
385 i2c_smbus_write_byte_data(to_i2c_client(dev),
386 FSCHMD_REG_TEMP_LIMIT[data->kind][index], v);
387 data->temp_max[index] = v;
388 mutex_unlock(&data->update_lock);
389
390 return count;
391}
392
393static ssize_t show_temp_fault(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 /* bit 0 set means sensor working ok, so no fault! */
400 if (data->temp_status[index] & FSCHMD_TEMP_WORKING)
401 return sprintf(buf, "0\n");
402 else
403 return sprintf(buf, "1\n");
404}
405
406static ssize_t show_temp_alarm(struct device *dev,
407 struct device_attribute *devattr, char *buf)
408{
409 int index = to_sensor_dev_attr(devattr)->index;
410 struct fschmd_data *data = fschmd_update_device(dev);
411
412 if ((data->temp_status[index] & FSCHMD_TEMP_ALARM_MASK) ==
413 FSCHMD_TEMP_ALARM_MASK)
414 return sprintf(buf, "1\n");
415 else
416 return sprintf(buf, "0\n");
417}
418
419
420#define RPM_FROM_REG(val) ((val) * 60)
421
422static ssize_t show_fan_value(struct device *dev,
423 struct device_attribute *devattr, char *buf)
424{
425 int index = to_sensor_dev_attr(devattr)->index;
426 struct fschmd_data *data = fschmd_update_device(dev);
427
428 return sprintf(buf, "%u\n", RPM_FROM_REG(data->fan_act[index]));
429}
430
431static ssize_t show_fan_div(struct device *dev,
432 struct device_attribute *devattr, char *buf)
433{
434 int index = to_sensor_dev_attr(devattr)->index;
435 struct fschmd_data *data = fschmd_update_device(dev);
436
437 /* bits 2..7 reserved => mask with 3 */
438 return sprintf(buf, "%d\n", 1 << (data->fan_ripple[index] & 3));
439}
440
441static ssize_t store_fan_div(struct device *dev, struct device_attribute
442 *devattr, const char *buf, size_t count)
443{
444 u8 reg;
445 int index = to_sensor_dev_attr(devattr)->index;
446 struct fschmd_data *data = dev_get_drvdata(dev);
447 /* supported values: 2, 4, 8 */
448 unsigned long v;
449 int err;
450
451 err = kstrtoul(buf, 10, &v);
452 if (err)
453 return err;
454
455 switch (v) {
456 case 2:
457 v = 1;
458 break;
459 case 4:
460 v = 2;
461 break;
462 case 8:
463 v = 3;
464 break;
465 default:
466 dev_err(dev,
467 "fan_div value %lu not supported. Choose one of 2, 4 or 8!\n",
468 v);
469 return -EINVAL;
470 }
471
472 mutex_lock(&data->update_lock);
473
474 reg = i2c_smbus_read_byte_data(to_i2c_client(dev),
475 FSCHMD_REG_FAN_RIPPLE[data->kind][index]);
476
477 /* bits 2..7 reserved => mask with 0x03 */
478 reg &= ~0x03;
479 reg |= v;
480
481 i2c_smbus_write_byte_data(to_i2c_client(dev),
482 FSCHMD_REG_FAN_RIPPLE[data->kind][index], reg);
483
484 data->fan_ripple[index] = reg;
485
486 mutex_unlock(&data->update_lock);
487
488 return count;
489}
490
491static ssize_t show_fan_alarm(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_ALARM)
498 return sprintf(buf, "1\n");
499 else
500 return sprintf(buf, "0\n");
501}
502
503static ssize_t show_fan_fault(struct device *dev,
504 struct device_attribute *devattr, char *buf)
505{
506 int index = to_sensor_dev_attr(devattr)->index;
507 struct fschmd_data *data = fschmd_update_device(dev);
508
509 if (data->fan_status[index] & FSCHMD_FAN_NOT_PRESENT)
510 return sprintf(buf, "1\n");
511 else
512 return sprintf(buf, "0\n");
513}
514
515
516static ssize_t show_pwm_auto_point1_pwm(struct device *dev,
517 struct device_attribute *devattr, char *buf)
518{
519 int index = to_sensor_dev_attr(devattr)->index;
520 struct fschmd_data *data = fschmd_update_device(dev);
521 int val = data->fan_min[index];
522
523 /* 0 = allow turning off (except on the syl), 1-255 = 50-100% */
524 if (val || data->kind == fscsyl)
525 val = val / 2 + 128;
526
527 return sprintf(buf, "%d\n", val);
528}
529
530static ssize_t store_pwm_auto_point1_pwm(struct device *dev,
531 struct device_attribute *devattr, const char *buf, size_t count)
532{
533 int index = to_sensor_dev_attr(devattr)->index;
534 struct fschmd_data *data = dev_get_drvdata(dev);
535 unsigned long v;
536 int err;
537
538 err = kstrtoul(buf, 10, &v);
539 if (err)
540 return err;
541
542 /* reg: 0 = allow turning off (except on the syl), 1-255 = 50-100% */
543 if (v || data->kind == fscsyl) {
544 v = clamp_val(v, 128, 255);
545 v = (v - 128) * 2 + 1;
546 }
547
548 mutex_lock(&data->update_lock);
549
550 i2c_smbus_write_byte_data(to_i2c_client(dev),
551 FSCHMD_REG_FAN_MIN[data->kind][index], v);
552 data->fan_min[index] = v;
553
554 mutex_unlock(&data->update_lock);
555
556 return count;
557}
558
559
560/*
561 * The FSC hwmon family has the ability to force an attached alert led to flash
562 * from software, we export this as an alert_led sysfs attr
563 */
564static ssize_t show_alert_led(struct device *dev,
565 struct device_attribute *devattr, char *buf)
566{
567 struct fschmd_data *data = fschmd_update_device(dev);
568
569 if (data->global_control & FSCHMD_CONTROL_ALERT_LED)
570 return sprintf(buf, "1\n");
571 else
572 return sprintf(buf, "0\n");
573}
574
575static ssize_t store_alert_led(struct device *dev,
576 struct device_attribute *devattr, const char *buf, size_t count)
577{
578 u8 reg;
579 struct fschmd_data *data = dev_get_drvdata(dev);
580 unsigned long v;
581 int err;
582
583 err = kstrtoul(buf, 10, &v);
584 if (err)
585 return err;
586
587 mutex_lock(&data->update_lock);
588
589 reg = i2c_smbus_read_byte_data(to_i2c_client(dev), FSCHMD_REG_CONTROL);
590
591 if (v)
592 reg |= FSCHMD_CONTROL_ALERT_LED;
593 else
594 reg &= ~FSCHMD_CONTROL_ALERT_LED;
595
596 i2c_smbus_write_byte_data(to_i2c_client(dev), FSCHMD_REG_CONTROL, reg);
597
598 data->global_control = reg;
599
600 mutex_unlock(&data->update_lock);
601
602 return count;
603}
604
605static DEVICE_ATTR(alert_led, 0644, show_alert_led, store_alert_led);
606
607static struct sensor_device_attribute fschmd_attr[] = {
608 SENSOR_ATTR(in0_input, 0444, show_in_value, NULL, 0),
609 SENSOR_ATTR(in1_input, 0444, show_in_value, NULL, 1),
610 SENSOR_ATTR(in2_input, 0444, show_in_value, NULL, 2),
611 SENSOR_ATTR(in3_input, 0444, show_in_value, NULL, 3),
612 SENSOR_ATTR(in4_input, 0444, show_in_value, NULL, 4),
613 SENSOR_ATTR(in5_input, 0444, show_in_value, NULL, 5),
614};
615
616static struct sensor_device_attribute fschmd_temp_attr[] = {
617 SENSOR_ATTR(temp1_input, 0444, show_temp_value, NULL, 0),
618 SENSOR_ATTR(temp1_max, 0644, show_temp_max, store_temp_max, 0),
619 SENSOR_ATTR(temp1_fault, 0444, show_temp_fault, NULL, 0),
620 SENSOR_ATTR(temp1_alarm, 0444, show_temp_alarm, NULL, 0),
621 SENSOR_ATTR(temp2_input, 0444, show_temp_value, NULL, 1),
622 SENSOR_ATTR(temp2_max, 0644, show_temp_max, store_temp_max, 1),
623 SENSOR_ATTR(temp2_fault, 0444, show_temp_fault, NULL, 1),
624 SENSOR_ATTR(temp2_alarm, 0444, show_temp_alarm, NULL, 1),
625 SENSOR_ATTR(temp3_input, 0444, show_temp_value, NULL, 2),
626 SENSOR_ATTR(temp3_max, 0644, show_temp_max, store_temp_max, 2),
627 SENSOR_ATTR(temp3_fault, 0444, show_temp_fault, NULL, 2),
628 SENSOR_ATTR(temp3_alarm, 0444, show_temp_alarm, NULL, 2),
629 SENSOR_ATTR(temp4_input, 0444, show_temp_value, NULL, 3),
630 SENSOR_ATTR(temp4_max, 0644, show_temp_max, store_temp_max, 3),
631 SENSOR_ATTR(temp4_fault, 0444, show_temp_fault, NULL, 3),
632 SENSOR_ATTR(temp4_alarm, 0444, show_temp_alarm, NULL, 3),
633 SENSOR_ATTR(temp5_input, 0444, show_temp_value, NULL, 4),
634 SENSOR_ATTR(temp5_max, 0644, show_temp_max, store_temp_max, 4),
635 SENSOR_ATTR(temp5_fault, 0444, show_temp_fault, NULL, 4),
636 SENSOR_ATTR(temp5_alarm, 0444, show_temp_alarm, NULL, 4),
637 SENSOR_ATTR(temp6_input, 0444, show_temp_value, NULL, 5),
638 SENSOR_ATTR(temp6_max, 0644, show_temp_max, store_temp_max, 5),
639 SENSOR_ATTR(temp6_fault, 0444, show_temp_fault, NULL, 5),
640 SENSOR_ATTR(temp6_alarm, 0444, show_temp_alarm, NULL, 5),
641 SENSOR_ATTR(temp7_input, 0444, show_temp_value, NULL, 6),
642 SENSOR_ATTR(temp7_max, 0644, show_temp_max, store_temp_max, 6),
643 SENSOR_ATTR(temp7_fault, 0444, show_temp_fault, NULL, 6),
644 SENSOR_ATTR(temp7_alarm, 0444, show_temp_alarm, NULL, 6),
645 SENSOR_ATTR(temp8_input, 0444, show_temp_value, NULL, 7),
646 SENSOR_ATTR(temp8_max, 0644, show_temp_max, store_temp_max, 7),
647 SENSOR_ATTR(temp8_fault, 0444, show_temp_fault, NULL, 7),
648 SENSOR_ATTR(temp8_alarm, 0444, show_temp_alarm, NULL, 7),
649 SENSOR_ATTR(temp9_input, 0444, show_temp_value, NULL, 8),
650 SENSOR_ATTR(temp9_max, 0644, show_temp_max, store_temp_max, 8),
651 SENSOR_ATTR(temp9_fault, 0444, show_temp_fault, NULL, 8),
652 SENSOR_ATTR(temp9_alarm, 0444, show_temp_alarm, NULL, 8),
653 SENSOR_ATTR(temp10_input, 0444, show_temp_value, NULL, 9),
654 SENSOR_ATTR(temp10_max, 0644, show_temp_max, store_temp_max, 9),
655 SENSOR_ATTR(temp10_fault, 0444, show_temp_fault, NULL, 9),
656 SENSOR_ATTR(temp10_alarm, 0444, show_temp_alarm, NULL, 9),
657 SENSOR_ATTR(temp11_input, 0444, show_temp_value, NULL, 10),
658 SENSOR_ATTR(temp11_max, 0644, show_temp_max, store_temp_max, 10),
659 SENSOR_ATTR(temp11_fault, 0444, show_temp_fault, NULL, 10),
660 SENSOR_ATTR(temp11_alarm, 0444, show_temp_alarm, NULL, 10),
661};
662
663static struct sensor_device_attribute fschmd_fan_attr[] = {
664 SENSOR_ATTR(fan1_input, 0444, show_fan_value, NULL, 0),
665 SENSOR_ATTR(fan1_div, 0644, show_fan_div, store_fan_div, 0),
666 SENSOR_ATTR(fan1_alarm, 0444, show_fan_alarm, NULL, 0),
667 SENSOR_ATTR(fan1_fault, 0444, show_fan_fault, NULL, 0),
668 SENSOR_ATTR(pwm1_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
669 store_pwm_auto_point1_pwm, 0),
670 SENSOR_ATTR(fan2_input, 0444, show_fan_value, NULL, 1),
671 SENSOR_ATTR(fan2_div, 0644, show_fan_div, store_fan_div, 1),
672 SENSOR_ATTR(fan2_alarm, 0444, show_fan_alarm, NULL, 1),
673 SENSOR_ATTR(fan2_fault, 0444, show_fan_fault, NULL, 1),
674 SENSOR_ATTR(pwm2_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
675 store_pwm_auto_point1_pwm, 1),
676 SENSOR_ATTR(fan3_input, 0444, show_fan_value, NULL, 2),
677 SENSOR_ATTR(fan3_div, 0644, show_fan_div, store_fan_div, 2),
678 SENSOR_ATTR(fan3_alarm, 0444, show_fan_alarm, NULL, 2),
679 SENSOR_ATTR(fan3_fault, 0444, show_fan_fault, NULL, 2),
680 SENSOR_ATTR(pwm3_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
681 store_pwm_auto_point1_pwm, 2),
682 SENSOR_ATTR(fan4_input, 0444, show_fan_value, NULL, 3),
683 SENSOR_ATTR(fan4_div, 0644, show_fan_div, store_fan_div, 3),
684 SENSOR_ATTR(fan4_alarm, 0444, show_fan_alarm, NULL, 3),
685 SENSOR_ATTR(fan4_fault, 0444, show_fan_fault, NULL, 3),
686 SENSOR_ATTR(pwm4_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
687 store_pwm_auto_point1_pwm, 3),
688 SENSOR_ATTR(fan5_input, 0444, show_fan_value, NULL, 4),
689 SENSOR_ATTR(fan5_div, 0644, show_fan_div, store_fan_div, 4),
690 SENSOR_ATTR(fan5_alarm, 0444, show_fan_alarm, NULL, 4),
691 SENSOR_ATTR(fan5_fault, 0444, show_fan_fault, NULL, 4),
692 SENSOR_ATTR(pwm5_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
693 store_pwm_auto_point1_pwm, 4),
694 SENSOR_ATTR(fan6_input, 0444, show_fan_value, NULL, 5),
695 SENSOR_ATTR(fan6_div, 0644, show_fan_div, store_fan_div, 5),
696 SENSOR_ATTR(fan6_alarm, 0444, show_fan_alarm, NULL, 5),
697 SENSOR_ATTR(fan6_fault, 0444, show_fan_fault, NULL, 5),
698 SENSOR_ATTR(pwm6_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
699 store_pwm_auto_point1_pwm, 5),
700 SENSOR_ATTR(fan7_input, 0444, show_fan_value, NULL, 6),
701 SENSOR_ATTR(fan7_div, 0644, show_fan_div, store_fan_div, 6),
702 SENSOR_ATTR(fan7_alarm, 0444, show_fan_alarm, NULL, 6),
703 SENSOR_ATTR(fan7_fault, 0444, show_fan_fault, NULL, 6),
704 SENSOR_ATTR(pwm7_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
705 store_pwm_auto_point1_pwm, 6),
706};
707
708
709/*
710 * Watchdog routines
711 */
712
713static int watchdog_set_timeout(struct fschmd_data *data, int timeout)
714{
715 int ret, resolution;
716 int kind = data->kind + 1; /* 0-x array index -> 1-x module param */
717
718 /* 2 second or 60 second resolution? */
719 if (timeout <= 510 || kind == fscpos || kind == fscscy)
720 resolution = 2;
721 else
722 resolution = 60;
723
724 if (timeout < resolution || timeout > (resolution * 255))
725 return -EINVAL;
726
727 mutex_lock(&data->watchdog_lock);
728 if (!data->client) {
729 ret = -ENODEV;
730 goto leave;
731 }
732
733 if (resolution == 2)
734 data->watchdog_control &= ~FSCHMD_WDOG_CONTROL_RESOLUTION;
735 else
736 data->watchdog_control |= FSCHMD_WDOG_CONTROL_RESOLUTION;
737
738 data->watchdog_preset = DIV_ROUND_UP(timeout, resolution);
739
740 /* Write new timeout value */
741 i2c_smbus_write_byte_data(data->client,
742 FSCHMD_REG_WDOG_PRESET[data->kind], data->watchdog_preset);
743 /* Write new control register, do not trigger! */
744 i2c_smbus_write_byte_data(data->client,
745 FSCHMD_REG_WDOG_CONTROL[data->kind],
746 data->watchdog_control & ~FSCHMD_WDOG_CONTROL_TRIGGER);
747
748 ret = data->watchdog_preset * resolution;
749
750leave:
751 mutex_unlock(&data->watchdog_lock);
752 return ret;
753}
754
755static int watchdog_get_timeout(struct fschmd_data *data)
756{
757 int timeout;
758
759 mutex_lock(&data->watchdog_lock);
760 if (data->watchdog_control & FSCHMD_WDOG_CONTROL_RESOLUTION)
761 timeout = data->watchdog_preset * 60;
762 else
763 timeout = data->watchdog_preset * 2;
764 mutex_unlock(&data->watchdog_lock);
765
766 return timeout;
767}
768
769static int watchdog_trigger(struct fschmd_data *data)
770{
771 int ret = 0;
772
773 mutex_lock(&data->watchdog_lock);
774 if (!data->client) {
775 ret = -ENODEV;
776 goto leave;
777 }
778
779 data->watchdog_control |= FSCHMD_WDOG_CONTROL_TRIGGER;
780 i2c_smbus_write_byte_data(data->client,
781 FSCHMD_REG_WDOG_CONTROL[data->kind],
782 data->watchdog_control);
783leave:
784 mutex_unlock(&data->watchdog_lock);
785 return ret;
786}
787
788static int watchdog_stop(struct fschmd_data *data)
789{
790 int ret = 0;
791
792 mutex_lock(&data->watchdog_lock);
793 if (!data->client) {
794 ret = -ENODEV;
795 goto leave;
796 }
797
798 data->watchdog_control &= ~FSCHMD_WDOG_CONTROL_STARTED;
799 /*
800 * Don't store the stop flag in our watchdog control register copy, as
801 * its a write only bit (read always returns 0)
802 */
803 i2c_smbus_write_byte_data(data->client,
804 FSCHMD_REG_WDOG_CONTROL[data->kind],
805 data->watchdog_control | FSCHMD_WDOG_CONTROL_STOP);
806leave:
807 mutex_unlock(&data->watchdog_lock);
808 return ret;
809}
810
811static int watchdog_open(struct inode *inode, struct file *filp)
812{
813 struct fschmd_data *pos, *data = NULL;
814 int watchdog_is_open;
815
816 /*
817 * We get called from drivers/char/misc.c with misc_mtx hold, and we
818 * call misc_register() from fschmd_probe() with watchdog_data_mutex
819 * hold, as misc_register() takes the misc_mtx lock, this is a possible
820 * deadlock, so we use mutex_trylock here.
821 */
822 if (!mutex_trylock(&watchdog_data_mutex))
823 return -ERESTARTSYS;
824 list_for_each_entry(pos, &watchdog_data_list, list) {
825 if (pos->watchdog_miscdev.minor == iminor(inode)) {
826 data = pos;
827 break;
828 }
829 }
830 /* Note we can never not have found data, so we don't check for this */
831 watchdog_is_open = test_and_set_bit(0, &data->watchdog_is_open);
832 if (!watchdog_is_open)
833 kref_get(&data->kref);
834 mutex_unlock(&watchdog_data_mutex);
835
836 if (watchdog_is_open)
837 return -EBUSY;
838
839 /* Start the watchdog */
840 watchdog_trigger(data);
841 filp->private_data = data;
842
843 return nonseekable_open(inode, filp);
844}
845
846static int watchdog_release(struct inode *inode, struct file *filp)
847{
848 struct fschmd_data *data = filp->private_data;
849
850 if (data->watchdog_expect_close) {
851 watchdog_stop(data);
852 data->watchdog_expect_close = 0;
853 } else {
854 watchdog_trigger(data);
855 dev_crit(&data->client->dev,
856 "unexpected close, not stopping watchdog!\n");
857 }
858
859 clear_bit(0, &data->watchdog_is_open);
860
861 mutex_lock(&watchdog_data_mutex);
862 kref_put(&data->kref, fschmd_release_resources);
863 mutex_unlock(&watchdog_data_mutex);
864
865 return 0;
866}
867
868static ssize_t watchdog_write(struct file *filp, const char __user *buf,
869 size_t count, loff_t *offset)
870{
871 int ret;
872 struct fschmd_data *data = filp->private_data;
873
874 if (count) {
875 if (!nowayout) {
876 size_t i;
877
878 /* Clear it in case it was set with a previous write */
879 data->watchdog_expect_close = 0;
880
881 for (i = 0; i != count; i++) {
882 char c;
883 if (get_user(c, buf + i))
884 return -EFAULT;
885 if (c == 'V')
886 data->watchdog_expect_close = 1;
887 }
888 }
889 ret = watchdog_trigger(data);
890 if (ret < 0)
891 return ret;
892 }
893 return count;
894}
895
896static long watchdog_ioctl(struct file *filp, unsigned int cmd,
897 unsigned long arg)
898{
899 struct watchdog_info ident = {
900 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
901 WDIOF_CARDRESET,
902 .identity = "FSC watchdog"
903 };
904 int i, ret = 0;
905 struct fschmd_data *data = filp->private_data;
906
907 switch (cmd) {
908 case WDIOC_GETSUPPORT:
909 ident.firmware_version = data->revision;
910 if (!nowayout)
911 ident.options |= WDIOF_MAGICCLOSE;
912 if (copy_to_user((void __user *)arg, &ident, sizeof(ident)))
913 ret = -EFAULT;
914 break;
915
916 case WDIOC_GETSTATUS:
917 ret = put_user(0, (int __user *)arg);
918 break;
919
920 case WDIOC_GETBOOTSTATUS:
921 if (data->watchdog_state & FSCHMD_WDOG_STATE_CARDRESET)
922 ret = put_user(WDIOF_CARDRESET, (int __user *)arg);
923 else
924 ret = put_user(0, (int __user *)arg);
925 break;
926
927 case WDIOC_KEEPALIVE:
928 ret = watchdog_trigger(data);
929 break;
930
931 case WDIOC_GETTIMEOUT:
932 i = watchdog_get_timeout(data);
933 ret = put_user(i, (int __user *)arg);
934 break;
935
936 case WDIOC_SETTIMEOUT:
937 if (get_user(i, (int __user *)arg)) {
938 ret = -EFAULT;
939 break;
940 }
941 ret = watchdog_set_timeout(data, i);
942 if (ret > 0)
943 ret = put_user(ret, (int __user *)arg);
944 break;
945
946 case WDIOC_SETOPTIONS:
947 if (get_user(i, (int __user *)arg)) {
948 ret = -EFAULT;
949 break;
950 }
951
952 if (i & WDIOS_DISABLECARD)
953 ret = watchdog_stop(data);
954 else if (i & WDIOS_ENABLECARD)
955 ret = watchdog_trigger(data);
956 else
957 ret = -EINVAL;
958
959 break;
960 default:
961 ret = -ENOTTY;
962 }
963 return ret;
964}
965
966static const struct file_operations watchdog_fops = {
967 .owner = THIS_MODULE,
968 .llseek = no_llseek,
969 .open = watchdog_open,
970 .release = watchdog_release,
971 .write = watchdog_write,
972 .unlocked_ioctl = watchdog_ioctl,
973};
974
975
976/*
977 * Detect, register, unregister and update device functions
978 */
979
980/*
981 * DMI decode routine to read voltage scaling factors from special DMI tables,
982 * which are available on FSC machines with an fscher or later chip.
983 */
984static void fschmd_dmi_decode(const struct dmi_header *header, void *dummy)
985{
986 int i, mult[3] = { 0 }, offset[3] = { 0 }, vref = 0, found = 0;
987
988 /*
989 * dmi code ugliness, we get passed the address of the contents of
990 * a complete DMI record, but in the form of a dmi_header pointer, in
991 * reality this address holds header->length bytes of which the header
992 * are the first 4 bytes
993 */
994 u8 *dmi_data = (u8 *)header;
995
996 /* We are looking for OEM-specific type 185 */
997 if (header->type != 185)
998 return;
999
1000 /*
1001 * we are looking for what Siemens calls "subtype" 19, the subtype
1002 * is stored in byte 5 of the dmi block
1003 */
1004 if (header->length < 5 || dmi_data[4] != 19)
1005 return;
1006
1007 /*
1008 * After the subtype comes 1 unknown byte and then blocks of 5 bytes,
1009 * consisting of what Siemens calls an "Entity" number, followed by
1010 * 2 16-bit words in LSB first order
1011 */
1012 for (i = 6; (i + 4) < header->length; i += 5) {
1013 /* entity 1 - 3: voltage multiplier and offset */
1014 if (dmi_data[i] >= 1 && dmi_data[i] <= 3) {
1015 /* Our in sensors order and the DMI order differ */
1016 const int shuffle[3] = { 1, 0, 2 };
1017 int in = shuffle[dmi_data[i] - 1];
1018
1019 /* Check for twice the same entity */
1020 if (found & (1 << in))
1021 return;
1022
1023 mult[in] = dmi_data[i + 1] | (dmi_data[i + 2] << 8);
1024 offset[in] = dmi_data[i + 3] | (dmi_data[i + 4] << 8);
1025
1026 found |= 1 << in;
1027 }
1028
1029 /* entity 7: reference voltage */
1030 if (dmi_data[i] == 7) {
1031 /* Check for twice the same entity */
1032 if (found & 0x08)
1033 return;
1034
1035 vref = dmi_data[i + 1] | (dmi_data[i + 2] << 8);
1036
1037 found |= 0x08;
1038 }
1039 }
1040
1041 if (found == 0x0F) {
1042 for (i = 0; i < 3; i++) {
1043 dmi_mult[i] = mult[i] * 10;
1044 dmi_offset[i] = offset[i] * 10;
1045 }
1046 /*
1047 * According to the docs there should be separate dmi entries
1048 * for the mult's and offsets of in3-5 of the syl, but on
1049 * my test machine these are not present
1050 */
1051 dmi_mult[3] = dmi_mult[2];
1052 dmi_mult[4] = dmi_mult[1];
1053 dmi_mult[5] = dmi_mult[2];
1054 dmi_offset[3] = dmi_offset[2];
1055 dmi_offset[4] = dmi_offset[1];
1056 dmi_offset[5] = dmi_offset[2];
1057 dmi_vref = vref;
1058 }
1059}
1060
1061static int fschmd_detect(struct i2c_client *client,
1062 struct i2c_board_info *info)
1063{
1064 enum chips kind;
1065 struct i2c_adapter *adapter = client->adapter;
1066 char id[4];
1067
1068 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
1069 return -ENODEV;
1070
1071 /* Detect & Identify the chip */
1072 id[0] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_0);
1073 id[1] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_1);
1074 id[2] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_2);
1075 id[3] = '\0';
1076
1077 if (!strcmp(id, "PEG"))
1078 kind = fscpos;
1079 else if (!strcmp(id, "HER"))
1080 kind = fscher;
1081 else if (!strcmp(id, "SCY"))
1082 kind = fscscy;
1083 else if (!strcmp(id, "HRC"))
1084 kind = fschrc;
1085 else if (!strcmp(id, "HMD"))
1086 kind = fschmd;
1087 else if (!strcmp(id, "HDS"))
1088 kind = fschds;
1089 else if (!strcmp(id, "SYL"))
1090 kind = fscsyl;
1091 else
1092 return -ENODEV;
1093
1094 strlcpy(info->type, fschmd_id[kind].name, I2C_NAME_SIZE);
1095
1096 return 0;
1097}
1098
1099static int fschmd_probe(struct i2c_client *client,
1100 const struct i2c_device_id *id)
1101{
1102 struct fschmd_data *data;
1103 const char * const names[7] = { "Poseidon", "Hermes", "Scylla",
1104 "Heracles", "Heimdall", "Hades", "Syleus" };
1105 const int watchdog_minors[] = { WATCHDOG_MINOR, 212, 213, 214, 215 };
1106 int i, err;
1107 enum chips kind = id->driver_data;
1108
1109 data = kzalloc(sizeof(struct fschmd_data), GFP_KERNEL);
1110 if (!data)
1111 return -ENOMEM;
1112
1113 i2c_set_clientdata(client, data);
1114 mutex_init(&data->update_lock);
1115 mutex_init(&data->watchdog_lock);
1116 INIT_LIST_HEAD(&data->list);
1117 kref_init(&data->kref);
1118 /*
1119 * Store client pointer in our data struct for watchdog usage
1120 * (where the client is found through a data ptr instead of the
1121 * otherway around)
1122 */
1123 data->client = client;
1124 data->kind = kind;
1125
1126 if (kind == fscpos) {
1127 /*
1128 * The Poseidon has hardwired temp limits, fill these
1129 * in for the alarm resetting code
1130 */
1131 data->temp_max[0] = 70 + 128;
1132 data->temp_max[1] = 50 + 128;
1133 data->temp_max[2] = 50 + 128;
1134 }
1135
1136 /* Read the special DMI table for fscher and newer chips */
1137 if ((kind == fscher || kind >= fschrc) && dmi_vref == -1) {
1138 dmi_walk(fschmd_dmi_decode, NULL);
1139 if (dmi_vref == -1) {
1140 dev_warn(&client->dev,
1141 "Couldn't get voltage scaling factors from "
1142 "BIOS DMI table, using builtin defaults\n");
1143 dmi_vref = 33;
1144 }
1145 }
1146
1147 /* Read in some never changing registers */
1148 data->revision = i2c_smbus_read_byte_data(client, FSCHMD_REG_REVISION);
1149 data->global_control = i2c_smbus_read_byte_data(client,
1150 FSCHMD_REG_CONTROL);
1151 data->watchdog_control = i2c_smbus_read_byte_data(client,
1152 FSCHMD_REG_WDOG_CONTROL[data->kind]);
1153 data->watchdog_state = i2c_smbus_read_byte_data(client,
1154 FSCHMD_REG_WDOG_STATE[data->kind]);
1155 data->watchdog_preset = i2c_smbus_read_byte_data(client,
1156 FSCHMD_REG_WDOG_PRESET[data->kind]);
1157
1158 err = device_create_file(&client->dev, &dev_attr_alert_led);
1159 if (err)
1160 goto exit_detach;
1161
1162 for (i = 0; i < FSCHMD_NO_VOLT_SENSORS[data->kind]; i++) {
1163 err = device_create_file(&client->dev,
1164 &fschmd_attr[i].dev_attr);
1165 if (err)
1166 goto exit_detach;
1167 }
1168
1169 for (i = 0; i < (FSCHMD_NO_TEMP_SENSORS[data->kind] * 4); i++) {
1170 /* Poseidon doesn't have TEMP_LIMIT registers */
1171 if (kind == fscpos && fschmd_temp_attr[i].dev_attr.show ==
1172 show_temp_max)
1173 continue;
1174
1175 if (kind == fscsyl) {
1176 if (i % 4 == 0)
1177 data->temp_status[i / 4] =
1178 i2c_smbus_read_byte_data(client,
1179 FSCHMD_REG_TEMP_STATE
1180 [data->kind][i / 4]);
1181 if (data->temp_status[i / 4] & FSCHMD_TEMP_DISABLED)
1182 continue;
1183 }
1184
1185 err = device_create_file(&client->dev,
1186 &fschmd_temp_attr[i].dev_attr);
1187 if (err)
1188 goto exit_detach;
1189 }
1190
1191 for (i = 0; i < (FSCHMD_NO_FAN_SENSORS[data->kind] * 5); i++) {
1192 /* Poseidon doesn't have a FAN_MIN register for its 3rd fan */
1193 if (kind == fscpos &&
1194 !strcmp(fschmd_fan_attr[i].dev_attr.attr.name,
1195 "pwm3_auto_point1_pwm"))
1196 continue;
1197
1198 if (kind == fscsyl) {
1199 if (i % 5 == 0)
1200 data->fan_status[i / 5] =
1201 i2c_smbus_read_byte_data(client,
1202 FSCHMD_REG_FAN_STATE
1203 [data->kind][i / 5]);
1204 if (data->fan_status[i / 5] & FSCHMD_FAN_DISABLED)
1205 continue;
1206 }
1207
1208 err = device_create_file(&client->dev,
1209 &fschmd_fan_attr[i].dev_attr);
1210 if (err)
1211 goto exit_detach;
1212 }
1213
1214 data->hwmon_dev = hwmon_device_register(&client->dev);
1215 if (IS_ERR(data->hwmon_dev)) {
1216 err = PTR_ERR(data->hwmon_dev);
1217 data->hwmon_dev = NULL;
1218 goto exit_detach;
1219 }
1220
1221 /*
1222 * We take the data_mutex lock early so that watchdog_open() cannot
1223 * run when misc_register() has completed, but we've not yet added
1224 * our data to the watchdog_data_list (and set the default timeout)
1225 */
1226 mutex_lock(&watchdog_data_mutex);
1227 for (i = 0; i < ARRAY_SIZE(watchdog_minors); i++) {
1228 /* Register our watchdog part */
1229 snprintf(data->watchdog_name, sizeof(data->watchdog_name),
1230 "watchdog%c", (i == 0) ? '\0' : ('0' + i));
1231 data->watchdog_miscdev.name = data->watchdog_name;
1232 data->watchdog_miscdev.fops = &watchdog_fops;
1233 data->watchdog_miscdev.minor = watchdog_minors[i];
1234 err = misc_register(&data->watchdog_miscdev);
1235 if (err == -EBUSY)
1236 continue;
1237 if (err) {
1238 data->watchdog_miscdev.minor = 0;
1239 dev_err(&client->dev,
1240 "Registering watchdog chardev: %d\n", err);
1241 break;
1242 }
1243
1244 list_add(&data->list, &watchdog_data_list);
1245 watchdog_set_timeout(data, 60);
1246 dev_info(&client->dev,
1247 "Registered watchdog chardev major 10, minor: %d\n",
1248 watchdog_minors[i]);
1249 break;
1250 }
1251 if (i == ARRAY_SIZE(watchdog_minors)) {
1252 data->watchdog_miscdev.minor = 0;
1253 dev_warn(&client->dev,
1254 "Couldn't register watchdog chardev (due to no free minor)\n");
1255 }
1256 mutex_unlock(&watchdog_data_mutex);
1257
1258 dev_info(&client->dev, "Detected FSC %s chip, revision: %d\n",
1259 names[data->kind], (int) data->revision);
1260
1261 return 0;
1262
1263exit_detach:
1264 fschmd_remove(client); /* will also free data for us */
1265 return err;
1266}
1267
1268static int fschmd_remove(struct i2c_client *client)
1269{
1270 struct fschmd_data *data = i2c_get_clientdata(client);
1271 int i;
1272
1273 /* Unregister the watchdog (if registered) */
1274 if (data->watchdog_miscdev.minor) {
1275 misc_deregister(&data->watchdog_miscdev);
1276 if (data->watchdog_is_open) {
1277 dev_warn(&client->dev,
1278 "i2c client detached with watchdog open! "
1279 "Stopping watchdog.\n");
1280 watchdog_stop(data);
1281 }
1282 mutex_lock(&watchdog_data_mutex);
1283 list_del(&data->list);
1284 mutex_unlock(&watchdog_data_mutex);
1285 /* Tell the watchdog code the client is gone */
1286 mutex_lock(&data->watchdog_lock);
1287 data->client = NULL;
1288 mutex_unlock(&data->watchdog_lock);
1289 }
1290
1291 /*
1292 * Check if registered in case we're called from fschmd_detect
1293 * to cleanup after an error
1294 */
1295 if (data->hwmon_dev)
1296 hwmon_device_unregister(data->hwmon_dev);
1297
1298 device_remove_file(&client->dev, &dev_attr_alert_led);
1299 for (i = 0; i < (FSCHMD_NO_VOLT_SENSORS[data->kind]); i++)
1300 device_remove_file(&client->dev, &fschmd_attr[i].dev_attr);
1301 for (i = 0; i < (FSCHMD_NO_TEMP_SENSORS[data->kind] * 4); i++)
1302 device_remove_file(&client->dev,
1303 &fschmd_temp_attr[i].dev_attr);
1304 for (i = 0; i < (FSCHMD_NO_FAN_SENSORS[data->kind] * 5); i++)
1305 device_remove_file(&client->dev,
1306 &fschmd_fan_attr[i].dev_attr);
1307
1308 mutex_lock(&watchdog_data_mutex);
1309 kref_put(&data->kref, fschmd_release_resources);
1310 mutex_unlock(&watchdog_data_mutex);
1311
1312 return 0;
1313}
1314
1315static struct fschmd_data *fschmd_update_device(struct device *dev)
1316{
1317 struct i2c_client *client = to_i2c_client(dev);
1318 struct fschmd_data *data = i2c_get_clientdata(client);
1319 int i;
1320
1321 mutex_lock(&data->update_lock);
1322
1323 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
1324
1325 for (i = 0; i < FSCHMD_NO_TEMP_SENSORS[data->kind]; i++) {
1326 data->temp_act[i] = i2c_smbus_read_byte_data(client,
1327 FSCHMD_REG_TEMP_ACT[data->kind][i]);
1328 data->temp_status[i] = i2c_smbus_read_byte_data(client,
1329 FSCHMD_REG_TEMP_STATE[data->kind][i]);
1330
1331 /* The fscpos doesn't have TEMP_LIMIT registers */
1332 if (FSCHMD_REG_TEMP_LIMIT[data->kind][i])
1333 data->temp_max[i] = i2c_smbus_read_byte_data(
1334 client,
1335 FSCHMD_REG_TEMP_LIMIT[data->kind][i]);
1336
1337 /*
1338 * reset alarm if the alarm condition is gone,
1339 * the chip doesn't do this itself
1340 */
1341 if ((data->temp_status[i] & FSCHMD_TEMP_ALARM_MASK) ==
1342 FSCHMD_TEMP_ALARM_MASK &&
1343 data->temp_act[i] < data->temp_max[i])
1344 i2c_smbus_write_byte_data(client,
1345 FSCHMD_REG_TEMP_STATE[data->kind][i],
1346 data->temp_status[i]);
1347 }
1348
1349 for (i = 0; i < FSCHMD_NO_FAN_SENSORS[data->kind]; i++) {
1350 data->fan_act[i] = i2c_smbus_read_byte_data(client,
1351 FSCHMD_REG_FAN_ACT[data->kind][i]);
1352 data->fan_status[i] = i2c_smbus_read_byte_data(client,
1353 FSCHMD_REG_FAN_STATE[data->kind][i]);
1354 data->fan_ripple[i] = i2c_smbus_read_byte_data(client,
1355 FSCHMD_REG_FAN_RIPPLE[data->kind][i]);
1356
1357 /* The fscpos third fan doesn't have a fan_min */
1358 if (FSCHMD_REG_FAN_MIN[data->kind][i])
1359 data->fan_min[i] = i2c_smbus_read_byte_data(
1360 client,
1361 FSCHMD_REG_FAN_MIN[data->kind][i]);
1362
1363 /* reset fan status if speed is back to > 0 */
1364 if ((data->fan_status[i] & FSCHMD_FAN_ALARM) &&
1365 data->fan_act[i])
1366 i2c_smbus_write_byte_data(client,
1367 FSCHMD_REG_FAN_STATE[data->kind][i],
1368 data->fan_status[i]);
1369 }
1370
1371 for (i = 0; i < FSCHMD_NO_VOLT_SENSORS[data->kind]; i++)
1372 data->volt[i] = i2c_smbus_read_byte_data(client,
1373 FSCHMD_REG_VOLT[data->kind][i]);
1374
1375 data->last_updated = jiffies;
1376 data->valid = 1;
1377 }
1378
1379 mutex_unlock(&data->update_lock);
1380
1381 return data;
1382}
1383
1384module_i2c_driver(fschmd_driver);
1385
1386MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
1387MODULE_DESCRIPTION("FSC Poseidon, Hermes, Scylla, Heracles, Heimdall, Hades "
1388 "and Syleus driver");
1389MODULE_LICENSE("GPL");