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qed: Fix stack out of bounds bug
[linux-stable.git] / drivers / hwmon / fschmd.c
blob5e78229ade049f41cc1277da5d0af85f59f45e45
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 */
53 static const unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };
54
55 /* Insmod parameters */
56 static bool nowayout = WATCHDOG_NOWAYOUT;
57 module_param(nowayout, bool, 0);
58 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
59 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
60
61 enum 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 */
80 static const u8 FSCHMD_REG_WDOG_CONTROL[7] = {
81 0x21, 0x21, 0x21, 0x21, 0x21, 0x28, 0x28 };
82 static const u8 FSCHMD_REG_WDOG_STATE[7] = {
83 0x23, 0x23, 0x23, 0x23, 0x23, 0x29, 0x29 };
84 static 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 */
95 static 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
105 static 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 */
113 static 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 */
124 static 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 */
135 static 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 */
146 static 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
156 static 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 */
165 static 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 */
177 static 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 */
195 static 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
216 static 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
230 static int fschmd_probe(struct i2c_client *client,
231 const struct i2c_device_id *id);
232 static int fschmd_detect(struct i2c_client *client,
233 struct i2c_board_info *info);
234 static int fschmd_remove(struct i2c_client *client);
235 static struct fschmd_data *fschmd_update_device(struct device *dev);
236
237 /*
238 * Driver data (common to all clients)
239 */
240
241 static 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 };
251 MODULE_DEVICE_TABLE(i2c, fschmd_id);
252
253 static 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
269 struct 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 */
307 static int dmi_mult[6] = { 490, 200, 100, 100, 200, 100 };
308 static int dmi_offset[6] = { 0, 0, 0, 0, 0, 0 };
309 static 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 */
316 static LIST_HEAD(watchdog_data_list);
317 /* Note this lock not only protect list access, but also data.kref access */
318 static 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 */
324 static 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
334 static 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
352 static 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
361 static 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
370 static 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
393 static 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
406 static 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
422 static 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
431 static 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
441 static 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
491 static 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
503 static 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
516 static 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
530 static 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 */
564 static ssize_t alert_led_show(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
575 static ssize_t alert_led_store(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
605 static DEVICE_ATTR_RW(alert_led);
606
607 static 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
616 static 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
663 static 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
713 static 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
750 leave:
751 mutex_unlock(&data->watchdog_lock);
752 return ret;
753 }
754
755 static 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
769 static 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);
783 leave:
784 mutex_unlock(&data->watchdog_lock);
785 return ret;
786 }
787
788 static 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);
806 leave:
807 mutex_unlock(&data->watchdog_lock);
808 return ret;
809 }
810
811 static 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
846 static 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
868 static 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
896 static 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
966 static 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 */
984 static 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
1061 static 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
1099 static 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
1263 exit_detach:
1264 fschmd_remove(client); /* will also free data for us */
1265 return err;
1266 }
1267
1268 static 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
1315 static 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
1384 module_i2c_driver(fschmd_driver);
1385
1386 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
1387 MODULE_DESCRIPTION("FSC Poseidon, Hermes, Scylla, Heracles, Heimdall, Hades "
1388 "and Syleus driver");
1389 MODULE_LICENSE("GPL");
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