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hwmon: (fschmd) Fix a memleak on multiple opens of /dev/watchdog
[linux-2.6/btrfs-unstable.git] / drivers / hwmon / fschmd.c
blobfa0728232e7179e6afc8b1b529948d13766d297e
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 */
52 static const unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };
53
54 /* Insmod parameters */
55 static int nowayout = WATCHDOG_NOWAYOUT;
56 module_param(nowayout, int, 0);
57 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
58 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
59
60 enum 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 */
79 static const u8 FSCHMD_REG_WDOG_CONTROL[7] =
80 { 0x21, 0x21, 0x21, 0x21, 0x21, 0x28, 0x28 };
81 static const u8 FSCHMD_REG_WDOG_STATE[7] =
82 { 0x23, 0x23, 0x23, 0x23, 0x23, 0x29, 0x29 };
83 static 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 */
94 static 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
104 static 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. */
110 static 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 */
121 static 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 */
132 static 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 */
143 static 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
153 static 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 */
162 static 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 */
174 static 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?? */
190 static 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.
206 static const u8 FSCHER_REG_TEMP_AUTOP1[] = { 0x73, 0x83, 0x93 };
207 static const u8 FSCHER_REG_TEMP_AUTOP2[] = { 0x75, 0x85, 0x95 }; */
208
209 static 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
223 static int fschmd_probe(struct i2c_client *client,
224 const struct i2c_device_id *id);
225 static int fschmd_detect(struct i2c_client *client,
226 struct i2c_board_info *info);
227 static int fschmd_remove(struct i2c_client *client);
228 static struct fschmd_data *fschmd_update_device(struct device *dev);
229
230 /*
231 * Driver data (common to all clients)
232 */
233
234 static 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 };
244 MODULE_DEVICE_TABLE(i2c, fschmd_id);
245
246 static 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
262 struct 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 int 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. */
298 static int dmi_mult[6] = { 490, 200, 100, 100, 200, 100 };
299 static int dmi_offset[6] = { 0, 0, 0, 0, 0, 0 };
300 static 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. */
305 static LIST_HEAD(watchdog_data_list);
306 /* Note this lock not only protect list access, but also data.kref access */
307 static 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 */
311 static 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
321 static 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 /* fscher / fschrc - 1 as data->kind is an array index, not a chips */
329 if (data->kind == (fscher - 1) || data->kind >= (fschrc - 1))
330 return sprintf(buf, "%d\n", (data->volt[index] * dmi_vref *
331 dmi_mult[index]) / 255 + dmi_offset[index]);
332 else
333 return sprintf(buf, "%d\n", (data->volt[index] *
334 max_reading[index] + 128) / 255);
335 }
336
337
338 #define TEMP_FROM_REG(val) (((val) - 128) * 1000)
339
340 static ssize_t show_temp_value(struct device *dev,
341 struct device_attribute *devattr, char *buf)
342 {
343 int index = to_sensor_dev_attr(devattr)->index;
344 struct fschmd_data *data = fschmd_update_device(dev);
345
346 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_act[index]));
347 }
348
349 static ssize_t show_temp_max(struct device *dev,
350 struct device_attribute *devattr, char *buf)
351 {
352 int index = to_sensor_dev_attr(devattr)->index;
353 struct fschmd_data *data = fschmd_update_device(dev);
354
355 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[index]));
356 }
357
358 static ssize_t store_temp_max(struct device *dev, struct device_attribute
359 *devattr, const char *buf, size_t count)
360 {
361 int index = to_sensor_dev_attr(devattr)->index;
362 struct fschmd_data *data = dev_get_drvdata(dev);
363 long v = simple_strtol(buf, NULL, 10) / 1000;
364
365 v = SENSORS_LIMIT(v, -128, 127) + 128;
366
367 mutex_lock(&data->update_lock);
368 i2c_smbus_write_byte_data(to_i2c_client(dev),
369 FSCHMD_REG_TEMP_LIMIT[data->kind][index], v);
370 data->temp_max[index] = v;
371 mutex_unlock(&data->update_lock);
372
373 return count;
374 }
375
376 static ssize_t show_temp_fault(struct device *dev,
377 struct device_attribute *devattr, char *buf)
378 {
379 int index = to_sensor_dev_attr(devattr)->index;
380 struct fschmd_data *data = fschmd_update_device(dev);
381
382 /* bit 0 set means sensor working ok, so no fault! */
383 if (data->temp_status[index] & FSCHMD_TEMP_WORKING)
384 return sprintf(buf, "0\n");
385 else
386 return sprintf(buf, "1\n");
387 }
388
389 static ssize_t show_temp_alarm(struct device *dev,
390 struct device_attribute *devattr, char *buf)
391 {
392 int index = to_sensor_dev_attr(devattr)->index;
393 struct fschmd_data *data = fschmd_update_device(dev);
394
395 if ((data->temp_status[index] & FSCHMD_TEMP_ALARM_MASK) ==
396 FSCHMD_TEMP_ALARM_MASK)
397 return sprintf(buf, "1\n");
398 else
399 return sprintf(buf, "0\n");
400 }
401
402
403 #define RPM_FROM_REG(val) ((val) * 60)
404
405 static ssize_t show_fan_value(struct device *dev,
406 struct device_attribute *devattr, char *buf)
407 {
408 int index = to_sensor_dev_attr(devattr)->index;
409 struct fschmd_data *data = fschmd_update_device(dev);
410
411 return sprintf(buf, "%u\n", RPM_FROM_REG(data->fan_act[index]));
412 }
413
414 static ssize_t show_fan_div(struct device *dev,
415 struct device_attribute *devattr, char *buf)
416 {
417 int index = to_sensor_dev_attr(devattr)->index;
418 struct fschmd_data *data = fschmd_update_device(dev);
419
420 /* bits 2..7 reserved => mask with 3 */
421 return sprintf(buf, "%d\n", 1 << (data->fan_ripple[index] & 3));
422 }
423
424 static ssize_t store_fan_div(struct device *dev, struct device_attribute
425 *devattr, const char *buf, size_t count)
426 {
427 u8 reg;
428 int index = to_sensor_dev_attr(devattr)->index;
429 struct fschmd_data *data = dev_get_drvdata(dev);
430 /* supported values: 2, 4, 8 */
431 unsigned long v = simple_strtoul(buf, NULL, 10);
432
433 switch (v) {
434 case 2: v = 1; break;
435 case 4: v = 2; break;
436 case 8: v = 3; break;
437 default:
438 dev_err(dev, "fan_div value %lu not supported. "
439 "Choose one of 2, 4 or 8!\n", v);
440 return -EINVAL;
441 }
442
443 mutex_lock(&data->update_lock);
444
445 reg = i2c_smbus_read_byte_data(to_i2c_client(dev),
446 FSCHMD_REG_FAN_RIPPLE[data->kind][index]);
447
448 /* bits 2..7 reserved => mask with 0x03 */
449 reg &= ~0x03;
450 reg |= v;
451
452 i2c_smbus_write_byte_data(to_i2c_client(dev),
453 FSCHMD_REG_FAN_RIPPLE[data->kind][index], reg);
454
455 data->fan_ripple[index] = reg;
456
457 mutex_unlock(&data->update_lock);
458
459 return count;
460 }
461
462 static ssize_t show_fan_alarm(struct device *dev,
463 struct device_attribute *devattr, char *buf)
464 {
465 int index = to_sensor_dev_attr(devattr)->index;
466 struct fschmd_data *data = fschmd_update_device(dev);
467
468 if (data->fan_status[index] & FSCHMD_FAN_ALARM)
469 return sprintf(buf, "1\n");
470 else
471 return sprintf(buf, "0\n");
472 }
473
474 static ssize_t show_fan_fault(struct device *dev,
475 struct device_attribute *devattr, char *buf)
476 {
477 int index = to_sensor_dev_attr(devattr)->index;
478 struct fschmd_data *data = fschmd_update_device(dev);
479
480 if (data->fan_status[index] & FSCHMD_FAN_NOT_PRESENT)
481 return sprintf(buf, "1\n");
482 else
483 return sprintf(buf, "0\n");
484 }
485
486
487 static ssize_t show_pwm_auto_point1_pwm(struct device *dev,
488 struct device_attribute *devattr, char *buf)
489 {
490 int index = to_sensor_dev_attr(devattr)->index;
491 struct fschmd_data *data = fschmd_update_device(dev);
492 int val = data->fan_min[index];
493
494 /* 0 = allow turning off (except on the syl), 1-255 = 50-100% */
495 if (val || data->kind == fscsyl - 1)
496 val = val / 2 + 128;
497
498 return sprintf(buf, "%d\n", val);
499 }
500
501 static ssize_t store_pwm_auto_point1_pwm(struct device *dev,
502 struct device_attribute *devattr, const char *buf, size_t count)
503 {
504 int index = to_sensor_dev_attr(devattr)->index;
505 struct fschmd_data *data = dev_get_drvdata(dev);
506 unsigned long v = simple_strtoul(buf, NULL, 10);
507
508 /* reg: 0 = allow turning off (except on the syl), 1-255 = 50-100% */
509 if (v || data->kind == fscsyl - 1) {
510 v = SENSORS_LIMIT(v, 128, 255);
511 v = (v - 128) * 2 + 1;
512 }
513
514 mutex_lock(&data->update_lock);
515
516 i2c_smbus_write_byte_data(to_i2c_client(dev),
517 FSCHMD_REG_FAN_MIN[data->kind][index], v);
518 data->fan_min[index] = v;
519
520 mutex_unlock(&data->update_lock);
521
522 return count;
523 }
524
525
526 /* The FSC hwmon family has the ability to force an attached alert led to flash
527 from software, we export this as an alert_led sysfs attr */
528 static ssize_t show_alert_led(struct device *dev,
529 struct device_attribute *devattr, char *buf)
530 {
531 struct fschmd_data *data = fschmd_update_device(dev);
532
533 if (data->global_control & FSCHMD_CONTROL_ALERT_LED)
534 return sprintf(buf, "1\n");
535 else
536 return sprintf(buf, "0\n");
537 }
538
539 static ssize_t store_alert_led(struct device *dev,
540 struct device_attribute *devattr, const char *buf, size_t count)
541 {
542 u8 reg;
543 struct fschmd_data *data = dev_get_drvdata(dev);
544 unsigned long v = simple_strtoul(buf, NULL, 10);
545
546 mutex_lock(&data->update_lock);
547
548 reg = i2c_smbus_read_byte_data(to_i2c_client(dev), FSCHMD_REG_CONTROL);
549
550 if (v)
551 reg |= FSCHMD_CONTROL_ALERT_LED;
552 else
553 reg &= ~FSCHMD_CONTROL_ALERT_LED;
554
555 i2c_smbus_write_byte_data(to_i2c_client(dev), FSCHMD_REG_CONTROL, reg);
556
557 data->global_control = reg;
558
559 mutex_unlock(&data->update_lock);
560
561 return count;
562 }
563
564 static DEVICE_ATTR(alert_led, 0644, show_alert_led, store_alert_led);
565
566 static struct sensor_device_attribute fschmd_attr[] = {
567 SENSOR_ATTR(in0_input, 0444, show_in_value, NULL, 0),
568 SENSOR_ATTR(in1_input, 0444, show_in_value, NULL, 1),
569 SENSOR_ATTR(in2_input, 0444, show_in_value, NULL, 2),
570 SENSOR_ATTR(in3_input, 0444, show_in_value, NULL, 3),
571 SENSOR_ATTR(in4_input, 0444, show_in_value, NULL, 4),
572 SENSOR_ATTR(in5_input, 0444, show_in_value, NULL, 5),
573 };
574
575 static struct sensor_device_attribute fschmd_temp_attr[] = {
576 SENSOR_ATTR(temp1_input, 0444, show_temp_value, NULL, 0),
577 SENSOR_ATTR(temp1_max, 0644, show_temp_max, store_temp_max, 0),
578 SENSOR_ATTR(temp1_fault, 0444, show_temp_fault, NULL, 0),
579 SENSOR_ATTR(temp1_alarm, 0444, show_temp_alarm, NULL, 0),
580 SENSOR_ATTR(temp2_input, 0444, show_temp_value, NULL, 1),
581 SENSOR_ATTR(temp2_max, 0644, show_temp_max, store_temp_max, 1),
582 SENSOR_ATTR(temp2_fault, 0444, show_temp_fault, NULL, 1),
583 SENSOR_ATTR(temp2_alarm, 0444, show_temp_alarm, NULL, 1),
584 SENSOR_ATTR(temp3_input, 0444, show_temp_value, NULL, 2),
585 SENSOR_ATTR(temp3_max, 0644, show_temp_max, store_temp_max, 2),
586 SENSOR_ATTR(temp3_fault, 0444, show_temp_fault, NULL, 2),
587 SENSOR_ATTR(temp3_alarm, 0444, show_temp_alarm, NULL, 2),
588 SENSOR_ATTR(temp4_input, 0444, show_temp_value, NULL, 3),
589 SENSOR_ATTR(temp4_max, 0644, show_temp_max, store_temp_max, 3),
590 SENSOR_ATTR(temp4_fault, 0444, show_temp_fault, NULL, 3),
591 SENSOR_ATTR(temp4_alarm, 0444, show_temp_alarm, NULL, 3),
592 SENSOR_ATTR(temp5_input, 0444, show_temp_value, NULL, 4),
593 SENSOR_ATTR(temp5_max, 0644, show_temp_max, store_temp_max, 4),
594 SENSOR_ATTR(temp5_fault, 0444, show_temp_fault, NULL, 4),
595 SENSOR_ATTR(temp5_alarm, 0444, show_temp_alarm, NULL, 4),
596 SENSOR_ATTR(temp6_input, 0444, show_temp_value, NULL, 5),
597 SENSOR_ATTR(temp6_max, 0644, show_temp_max, store_temp_max, 5),
598 SENSOR_ATTR(temp6_fault, 0444, show_temp_fault, NULL, 5),
599 SENSOR_ATTR(temp6_alarm, 0444, show_temp_alarm, NULL, 5),
600 SENSOR_ATTR(temp7_input, 0444, show_temp_value, NULL, 6),
601 SENSOR_ATTR(temp7_max, 0644, show_temp_max, store_temp_max, 6),
602 SENSOR_ATTR(temp7_fault, 0444, show_temp_fault, NULL, 6),
603 SENSOR_ATTR(temp7_alarm, 0444, show_temp_alarm, NULL, 6),
604 SENSOR_ATTR(temp8_input, 0444, show_temp_value, NULL, 7),
605 SENSOR_ATTR(temp8_max, 0644, show_temp_max, store_temp_max, 7),
606 SENSOR_ATTR(temp8_fault, 0444, show_temp_fault, NULL, 7),
607 SENSOR_ATTR(temp8_alarm, 0444, show_temp_alarm, NULL, 7),
608 SENSOR_ATTR(temp9_input, 0444, show_temp_value, NULL, 8),
609 SENSOR_ATTR(temp9_max, 0644, show_temp_max, store_temp_max, 8),
610 SENSOR_ATTR(temp9_fault, 0444, show_temp_fault, NULL, 8),
611 SENSOR_ATTR(temp9_alarm, 0444, show_temp_alarm, NULL, 8),
612 SENSOR_ATTR(temp10_input, 0444, show_temp_value, NULL, 9),
613 SENSOR_ATTR(temp10_max, 0644, show_temp_max, store_temp_max, 9),
614 SENSOR_ATTR(temp10_fault, 0444, show_temp_fault, NULL, 9),
615 SENSOR_ATTR(temp10_alarm, 0444, show_temp_alarm, NULL, 9),
616 SENSOR_ATTR(temp11_input, 0444, show_temp_value, NULL, 10),
617 SENSOR_ATTR(temp11_max, 0644, show_temp_max, store_temp_max, 10),
618 SENSOR_ATTR(temp11_fault, 0444, show_temp_fault, NULL, 10),
619 SENSOR_ATTR(temp11_alarm, 0444, show_temp_alarm, NULL, 10),
620 };
621
622 static struct sensor_device_attribute fschmd_fan_attr[] = {
623 SENSOR_ATTR(fan1_input, 0444, show_fan_value, NULL, 0),
624 SENSOR_ATTR(fan1_div, 0644, show_fan_div, store_fan_div, 0),
625 SENSOR_ATTR(fan1_alarm, 0444, show_fan_alarm, NULL, 0),
626 SENSOR_ATTR(fan1_fault, 0444, show_fan_fault, NULL, 0),
627 SENSOR_ATTR(pwm1_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
628 store_pwm_auto_point1_pwm, 0),
629 SENSOR_ATTR(fan2_input, 0444, show_fan_value, NULL, 1),
630 SENSOR_ATTR(fan2_div, 0644, show_fan_div, store_fan_div, 1),
631 SENSOR_ATTR(fan2_alarm, 0444, show_fan_alarm, NULL, 1),
632 SENSOR_ATTR(fan2_fault, 0444, show_fan_fault, NULL, 1),
633 SENSOR_ATTR(pwm2_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
634 store_pwm_auto_point1_pwm, 1),
635 SENSOR_ATTR(fan3_input, 0444, show_fan_value, NULL, 2),
636 SENSOR_ATTR(fan3_div, 0644, show_fan_div, store_fan_div, 2),
637 SENSOR_ATTR(fan3_alarm, 0444, show_fan_alarm, NULL, 2),
638 SENSOR_ATTR(fan3_fault, 0444, show_fan_fault, NULL, 2),
639 SENSOR_ATTR(pwm3_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
640 store_pwm_auto_point1_pwm, 2),
641 SENSOR_ATTR(fan4_input, 0444, show_fan_value, NULL, 3),
642 SENSOR_ATTR(fan4_div, 0644, show_fan_div, store_fan_div, 3),
643 SENSOR_ATTR(fan4_alarm, 0444, show_fan_alarm, NULL, 3),
644 SENSOR_ATTR(fan4_fault, 0444, show_fan_fault, NULL, 3),
645 SENSOR_ATTR(pwm4_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
646 store_pwm_auto_point1_pwm, 3),
647 SENSOR_ATTR(fan5_input, 0444, show_fan_value, NULL, 4),
648 SENSOR_ATTR(fan5_div, 0644, show_fan_div, store_fan_div, 4),
649 SENSOR_ATTR(fan5_alarm, 0444, show_fan_alarm, NULL, 4),
650 SENSOR_ATTR(fan5_fault, 0444, show_fan_fault, NULL, 4),
651 SENSOR_ATTR(pwm5_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
652 store_pwm_auto_point1_pwm, 4),
653 SENSOR_ATTR(fan6_input, 0444, show_fan_value, NULL, 5),
654 SENSOR_ATTR(fan6_div, 0644, show_fan_div, store_fan_div, 5),
655 SENSOR_ATTR(fan6_alarm, 0444, show_fan_alarm, NULL, 5),
656 SENSOR_ATTR(fan6_fault, 0444, show_fan_fault, NULL, 5),
657 SENSOR_ATTR(pwm6_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
658 store_pwm_auto_point1_pwm, 5),
659 SENSOR_ATTR(fan7_input, 0444, show_fan_value, NULL, 6),
660 SENSOR_ATTR(fan7_div, 0644, show_fan_div, store_fan_div, 6),
661 SENSOR_ATTR(fan7_alarm, 0444, show_fan_alarm, NULL, 6),
662 SENSOR_ATTR(fan7_fault, 0444, show_fan_fault, NULL, 6),
663 SENSOR_ATTR(pwm7_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
664 store_pwm_auto_point1_pwm, 6),
665 };
666
667
668 /*
669 * Watchdog routines
670 */
671
672 static int watchdog_set_timeout(struct fschmd_data *data, int timeout)
673 {
674 int ret, resolution;
675 int kind = data->kind + 1; /* 0-x array index -> 1-x module param */
676
677 /* 2 second or 60 second resolution? */
678 if (timeout <= 510 || kind == fscpos || kind == fscscy)
679 resolution = 2;
680 else
681 resolution = 60;
682
683 if (timeout < resolution || timeout > (resolution * 255))
684 return -EINVAL;
685
686 mutex_lock(&data->watchdog_lock);
687 if (!data->client) {
688 ret = -ENODEV;
689 goto leave;
690 }
691
692 if (resolution == 2)
693 data->watchdog_control &= ~FSCHMD_WDOG_CONTROL_RESOLUTION;
694 else
695 data->watchdog_control |= FSCHMD_WDOG_CONTROL_RESOLUTION;
696
697 data->watchdog_preset = DIV_ROUND_UP(timeout, resolution);
698
699 /* Write new timeout value */
700 i2c_smbus_write_byte_data(data->client,
701 FSCHMD_REG_WDOG_PRESET[data->kind], data->watchdog_preset);
702 /* Write new control register, do not trigger! */
703 i2c_smbus_write_byte_data(data->client,
704 FSCHMD_REG_WDOG_CONTROL[data->kind],
705 data->watchdog_control & ~FSCHMD_WDOG_CONTROL_TRIGGER);
706
707 ret = data->watchdog_preset * resolution;
708
709 leave:
710 mutex_unlock(&data->watchdog_lock);
711 return ret;
712 }
713
714 static int watchdog_get_timeout(struct fschmd_data *data)
715 {
716 int timeout;
717
718 mutex_lock(&data->watchdog_lock);
719 if (data->watchdog_control & FSCHMD_WDOG_CONTROL_RESOLUTION)
720 timeout = data->watchdog_preset * 60;
721 else
722 timeout = data->watchdog_preset * 2;
723 mutex_unlock(&data->watchdog_lock);
724
725 return timeout;
726 }
727
728 static int watchdog_trigger(struct fschmd_data *data)
729 {
730 int ret = 0;
731
732 mutex_lock(&data->watchdog_lock);
733 if (!data->client) {
734 ret = -ENODEV;
735 goto leave;
736 }
737
738 data->watchdog_control |= FSCHMD_WDOG_CONTROL_TRIGGER;
739 i2c_smbus_write_byte_data(data->client,
740 FSCHMD_REG_WDOG_CONTROL[data->kind],
741 data->watchdog_control);
742 leave:
743 mutex_unlock(&data->watchdog_lock);
744 return ret;
745 }
746
747 static int watchdog_stop(struct fschmd_data *data)
748 {
749 int ret = 0;
750
751 mutex_lock(&data->watchdog_lock);
752 if (!data->client) {
753 ret = -ENODEV;
754 goto leave;
755 }
756
757 data->watchdog_control &= ~FSCHMD_WDOG_CONTROL_STARTED;
758 /* Don't store the stop flag in our watchdog control register copy, as
759 its a write only bit (read always returns 0) */
760 i2c_smbus_write_byte_data(data->client,
761 FSCHMD_REG_WDOG_CONTROL[data->kind],
762 data->watchdog_control | FSCHMD_WDOG_CONTROL_STOP);
763 leave:
764 mutex_unlock(&data->watchdog_lock);
765 return ret;
766 }
767
768 static int watchdog_open(struct inode *inode, struct file *filp)
769 {
770 struct fschmd_data *pos, *data = NULL;
771 int watchdog_is_open;
772
773 /* We get called from drivers/char/misc.c with misc_mtx hold, and we
774 call misc_register() from fschmd_probe() with watchdog_data_mutex
775 hold, as misc_register() takes the misc_mtx lock, this is a possible
776 deadlock, so we use mutex_trylock here. */
777 if (!mutex_trylock(&watchdog_data_mutex))
778 return -ERESTARTSYS;
779 list_for_each_entry(pos, &watchdog_data_list, list) {
780 if (pos->watchdog_miscdev.minor == iminor(inode)) {
781 data = pos;
782 break;
783 }
784 }
785 /* Note we can never not have found data, so we don't check for this */
786 watchdog_is_open = test_and_set_bit(0, &data->watchdog_is_open);
787 if (!watchdog_is_open)
788 kref_get(&data->kref);
789 mutex_unlock(&watchdog_data_mutex);
790
791 if (watchdog_is_open)
792 return -EBUSY;
793
794 /* Start the watchdog */
795 watchdog_trigger(data);
796 filp->private_data = data;
797
798 return nonseekable_open(inode, filp);
799 }
800
801 static int watchdog_release(struct inode *inode, struct file *filp)
802 {
803 struct fschmd_data *data = filp->private_data;
804
805 if (data->watchdog_expect_close) {
806 watchdog_stop(data);
807 data->watchdog_expect_close = 0;
808 } else {
809 watchdog_trigger(data);
810 dev_crit(&data->client->dev,
811 "unexpected close, not stopping watchdog!\n");
812 }
813
814 clear_bit(0, &data->watchdog_is_open);
815
816 mutex_lock(&watchdog_data_mutex);
817 kref_put(&data->kref, fschmd_release_resources);
818 mutex_unlock(&watchdog_data_mutex);
819
820 return 0;
821 }
822
823 static ssize_t watchdog_write(struct file *filp, const char __user *buf,
824 size_t count, loff_t *offset)
825 {
826 int ret;
827 struct fschmd_data *data = filp->private_data;
828
829 if (count) {
830 if (!nowayout) {
831 size_t i;
832
833 /* Clear it in case it was set with a previous write */
834 data->watchdog_expect_close = 0;
835
836 for (i = 0; i != count; i++) {
837 char c;
838 if (get_user(c, buf + i))
839 return -EFAULT;
840 if (c == 'V')
841 data->watchdog_expect_close = 1;
842 }
843 }
844 ret = watchdog_trigger(data);
845 if (ret < 0)
846 return ret;
847 }
848 return count;
849 }
850
851 static int watchdog_ioctl(struct inode *inode, struct file *filp,
852 unsigned int cmd, unsigned long arg)
853 {
854 static struct watchdog_info ident = {
855 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
856 WDIOF_CARDRESET,
857 .identity = "FSC watchdog"
858 };
859 int i, ret = 0;
860 struct fschmd_data *data = filp->private_data;
861
862 switch (cmd) {
863 case WDIOC_GETSUPPORT:
864 ident.firmware_version = data->revision;
865 if (!nowayout)
866 ident.options |= WDIOF_MAGICCLOSE;
867 if (copy_to_user((void __user *)arg, &ident, sizeof(ident)))
868 ret = -EFAULT;
869 break;
870
871 case WDIOC_GETSTATUS:
872 ret = put_user(0, (int __user *)arg);
873 break;
874
875 case WDIOC_GETBOOTSTATUS:
876 if (data->watchdog_state & FSCHMD_WDOG_STATE_CARDRESET)
877 ret = put_user(WDIOF_CARDRESET, (int __user *)arg);
878 else
879 ret = put_user(0, (int __user *)arg);
880 break;
881
882 case WDIOC_KEEPALIVE:
883 ret = watchdog_trigger(data);
884 break;
885
886 case WDIOC_GETTIMEOUT:
887 i = watchdog_get_timeout(data);
888 ret = put_user(i, (int __user *)arg);
889 break;
890
891 case WDIOC_SETTIMEOUT:
892 if (get_user(i, (int __user *)arg)) {
893 ret = -EFAULT;
894 break;
895 }
896 ret = watchdog_set_timeout(data, i);
897 if (ret > 0)
898 ret = put_user(ret, (int __user *)arg);
899 break;
900
901 case WDIOC_SETOPTIONS:
902 if (get_user(i, (int __user *)arg)) {
903 ret = -EFAULT;
904 break;
905 }
906
907 if (i & WDIOS_DISABLECARD)
908 ret = watchdog_stop(data);
909 else if (i & WDIOS_ENABLECARD)
910 ret = watchdog_trigger(data);
911 else
912 ret = -EINVAL;
913
914 break;
915 default:
916 ret = -ENOTTY;
917 }
918
919 return ret;
920 }
921
922 static const struct file_operations watchdog_fops = {
923 .owner = THIS_MODULE,
924 .llseek = no_llseek,
925 .open = watchdog_open,
926 .release = watchdog_release,
927 .write = watchdog_write,
928 .ioctl = watchdog_ioctl,
929 };
930
931
932 /*
933 * Detect, register, unregister and update device functions
934 */
935
936 /* DMI decode routine to read voltage scaling factors from special DMI tables,
937 which are available on FSC machines with an fscher or later chip. */
938 static void fschmd_dmi_decode(const struct dmi_header *header, void *dummy)
939 {
940 int i, mult[3] = { 0 }, offset[3] = { 0 }, vref = 0, found = 0;
941
942 /* dmi code ugliness, we get passed the address of the contents of
943 a complete DMI record, but in the form of a dmi_header pointer, in
944 reality this address holds header->length bytes of which the header
945 are the first 4 bytes */
946 u8 *dmi_data = (u8 *)header;
947
948 /* We are looking for OEM-specific type 185 */
949 if (header->type != 185)
950 return;
951
952 /* we are looking for what Siemens calls "subtype" 19, the subtype
953 is stored in byte 5 of the dmi block */
954 if (header->length < 5 || dmi_data[4] != 19)
955 return;
956
957 /* After the subtype comes 1 unknown byte and then blocks of 5 bytes,
958 consisting of what Siemens calls an "Entity" number, followed by
959 2 16-bit words in LSB first order */
960 for (i = 6; (i + 4) < header->length; i += 5) {
961 /* entity 1 - 3: voltage multiplier and offset */
962 if (dmi_data[i] >= 1 && dmi_data[i] <= 3) {
963 /* Our in sensors order and the DMI order differ */
964 const int shuffle[3] = { 1, 0, 2 };
965 int in = shuffle[dmi_data[i] - 1];
966
967 /* Check for twice the same entity */
968 if (found & (1 << in))
969 return;
970
971 mult[in] = dmi_data[i + 1] | (dmi_data[i + 2] << 8);
972 offset[in] = dmi_data[i + 3] | (dmi_data[i + 4] << 8);
973
974 found |= 1 << in;
975 }
976
977 /* entity 7: reference voltage */
978 if (dmi_data[i] == 7) {
979 /* Check for twice the same entity */
980 if (found & 0x08)
981 return;
982
983 vref = dmi_data[i + 1] | (dmi_data[i + 2] << 8);
984
985 found |= 0x08;
986 }
987 }
988
989 if (found == 0x0F) {
990 for (i = 0; i < 3; i++) {
991 dmi_mult[i] = mult[i] * 10;
992 dmi_offset[i] = offset[i] * 10;
993 }
994 /* According to the docs there should be separate dmi entries
995 for the mult's and offsets of in3-5 of the syl, but on
996 my test machine these are not present */
997 dmi_mult[3] = dmi_mult[2];
998 dmi_mult[4] = dmi_mult[1];
999 dmi_mult[5] = dmi_mult[2];
1000 dmi_offset[3] = dmi_offset[2];
1001 dmi_offset[4] = dmi_offset[1];
1002 dmi_offset[5] = dmi_offset[2];
1003 dmi_vref = vref;
1004 }
1005 }
1006
1007 static int fschmd_detect(struct i2c_client *client,
1008 struct i2c_board_info *info)
1009 {
1010 enum chips kind;
1011 struct i2c_adapter *adapter = client->adapter;
1012 char id[4];
1013
1014 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
1015 return -ENODEV;
1016
1017 /* Detect & Identify the chip */
1018 id[0] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_0);
1019 id[1] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_1);
1020 id[2] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_2);
1021 id[3] = '\0';
1022
1023 if (!strcmp(id, "PEG"))
1024 kind = fscpos;
1025 else if (!strcmp(id, "HER"))
1026 kind = fscher;
1027 else if (!strcmp(id, "SCY"))
1028 kind = fscscy;
1029 else if (!strcmp(id, "HRC"))
1030 kind = fschrc;
1031 else if (!strcmp(id, "HMD"))
1032 kind = fschmd;
1033 else if (!strcmp(id, "HDS"))
1034 kind = fschds;
1035 else if (!strcmp(id, "SYL"))
1036 kind = fscsyl;
1037 else
1038 return -ENODEV;
1039
1040 strlcpy(info->type, fschmd_id[kind - 1].name, I2C_NAME_SIZE);
1041
1042 return 0;
1043 }
1044
1045 static int fschmd_probe(struct i2c_client *client,
1046 const struct i2c_device_id *id)
1047 {
1048 struct fschmd_data *data;
1049 const char * const names[7] = { "Poseidon", "Hermes", "Scylla",
1050 "Heracles", "Heimdall", "Hades", "Syleus" };
1051 const int watchdog_minors[] = { WATCHDOG_MINOR, 212, 213, 214, 215 };
1052 int i, err;
1053 enum chips kind = id->driver_data;
1054
1055 data = kzalloc(sizeof(struct fschmd_data), GFP_KERNEL);
1056 if (!data)
1057 return -ENOMEM;
1058
1059 i2c_set_clientdata(client, data);
1060 mutex_init(&data->update_lock);
1061 mutex_init(&data->watchdog_lock);
1062 INIT_LIST_HEAD(&data->list);
1063 kref_init(&data->kref);
1064 /* Store client pointer in our data struct for watchdog usage
1065 (where the client is found through a data ptr instead of the
1066 otherway around) */
1067 data->client = client;
1068
1069 if (kind == fscpos) {
1070 /* The Poseidon has hardwired temp limits, fill these
1071 in for the alarm resetting code */
1072 data->temp_max[0] = 70 + 128;
1073 data->temp_max[1] = 50 + 128;
1074 data->temp_max[2] = 50 + 128;
1075 }
1076
1077 /* Read the special DMI table for fscher and newer chips */
1078 if ((kind == fscher || kind >= fschrc) && dmi_vref == -1) {
1079 dmi_walk(fschmd_dmi_decode, NULL);
1080 if (dmi_vref == -1) {
1081 dev_warn(&client->dev,
1082 "Couldn't get voltage scaling factors from "
1083 "BIOS DMI table, using builtin defaults\n");
1084 dmi_vref = 33;
1085 }
1086 }
1087
1088 /* i2c kind goes from 1-6, we want from 0-5 to address arrays */
1089 data->kind = kind - 1;
1090
1091 /* Read in some never changing registers */
1092 data->revision = i2c_smbus_read_byte_data(client, FSCHMD_REG_REVISION);
1093 data->global_control = i2c_smbus_read_byte_data(client,
1094 FSCHMD_REG_CONTROL);
1095 data->watchdog_control = i2c_smbus_read_byte_data(client,
1096 FSCHMD_REG_WDOG_CONTROL[data->kind]);
1097 data->watchdog_state = i2c_smbus_read_byte_data(client,
1098 FSCHMD_REG_WDOG_STATE[data->kind]);
1099 data->watchdog_preset = i2c_smbus_read_byte_data(client,
1100 FSCHMD_REG_WDOG_PRESET[data->kind]);
1101
1102 err = device_create_file(&client->dev, &dev_attr_alert_led);
1103 if (err)
1104 goto exit_detach;
1105
1106 for (i = 0; i < FSCHMD_NO_VOLT_SENSORS[data->kind]; i++) {
1107 err = device_create_file(&client->dev,
1108 &fschmd_attr[i].dev_attr);
1109 if (err)
1110 goto exit_detach;
1111 }
1112
1113 for (i = 0; i < (FSCHMD_NO_TEMP_SENSORS[data->kind] * 4); i++) {
1114 /* Poseidon doesn't have TEMP_LIMIT registers */
1115 if (kind == fscpos && fschmd_temp_attr[i].dev_attr.show ==
1116 show_temp_max)
1117 continue;
1118
1119 if (kind == fscsyl) {
1120 if (i % 4 == 0)
1121 data->temp_status[i / 4] =
1122 i2c_smbus_read_byte_data(client,
1123 FSCHMD_REG_TEMP_STATE
1124 [data->kind][i / 4]);
1125 if (data->temp_status[i / 4] & FSCHMD_TEMP_DISABLED)
1126 continue;
1127 }
1128
1129 err = device_create_file(&client->dev,
1130 &fschmd_temp_attr[i].dev_attr);
1131 if (err)
1132 goto exit_detach;
1133 }
1134
1135 for (i = 0; i < (FSCHMD_NO_FAN_SENSORS[data->kind] * 5); i++) {
1136 /* Poseidon doesn't have a FAN_MIN register for its 3rd fan */
1137 if (kind == fscpos &&
1138 !strcmp(fschmd_fan_attr[i].dev_attr.attr.name,
1139 "pwm3_auto_point1_pwm"))
1140 continue;
1141
1142 if (kind == fscsyl) {
1143 if (i % 5 == 0)
1144 data->fan_status[i / 5] =
1145 i2c_smbus_read_byte_data(client,
1146 FSCHMD_REG_FAN_STATE
1147 [data->kind][i / 5]);
1148 if (data->fan_status[i / 5] & FSCHMD_FAN_DISABLED)
1149 continue;
1150 }
1151
1152 err = device_create_file(&client->dev,
1153 &fschmd_fan_attr[i].dev_attr);
1154 if (err)
1155 goto exit_detach;
1156 }
1157
1158 data->hwmon_dev = hwmon_device_register(&client->dev);
1159 if (IS_ERR(data->hwmon_dev)) {
1160 err = PTR_ERR(data->hwmon_dev);
1161 data->hwmon_dev = NULL;
1162 goto exit_detach;
1163 }
1164
1165 /* We take the data_mutex lock early so that watchdog_open() cannot
1166 run when misc_register() has completed, but we've not yet added
1167 our data to the watchdog_data_list (and set the default timeout) */
1168 mutex_lock(&watchdog_data_mutex);
1169 for (i = 0; i < ARRAY_SIZE(watchdog_minors); i++) {
1170 /* Register our watchdog part */
1171 snprintf(data->watchdog_name, sizeof(data->watchdog_name),
1172 "watchdog%c", (i == 0) ? '\0' : ('0' + i));
1173 data->watchdog_miscdev.name = data->watchdog_name;
1174 data->watchdog_miscdev.fops = &watchdog_fops;
1175 data->watchdog_miscdev.minor = watchdog_minors[i];
1176 err = misc_register(&data->watchdog_miscdev);
1177 if (err == -EBUSY)
1178 continue;
1179 if (err) {
1180 data->watchdog_miscdev.minor = 0;
1181 dev_err(&client->dev,
1182 "Registering watchdog chardev: %d\n", err);
1183 break;
1184 }
1185
1186 list_add(&data->list, &watchdog_data_list);
1187 watchdog_set_timeout(data, 60);
1188 dev_info(&client->dev,
1189 "Registered watchdog chardev major 10, minor: %d\n",
1190 watchdog_minors[i]);
1191 break;
1192 }
1193 if (i == ARRAY_SIZE(watchdog_minors)) {
1194 data->watchdog_miscdev.minor = 0;
1195 dev_warn(&client->dev, "Couldn't register watchdog chardev "
1196 "(due to no free minor)\n");
1197 }
1198 mutex_unlock(&watchdog_data_mutex);
1199
1200 dev_info(&client->dev, "Detected FSC %s chip, revision: %d\n",
1201 names[data->kind], (int) data->revision);
1202
1203 return 0;
1204
1205 exit_detach:
1206 fschmd_remove(client); /* will also free data for us */
1207 return err;
1208 }
1209
1210 static int fschmd_remove(struct i2c_client *client)
1211 {
1212 struct fschmd_data *data = i2c_get_clientdata(client);
1213 int i;
1214
1215 /* Unregister the watchdog (if registered) */
1216 if (data->watchdog_miscdev.minor) {
1217 misc_deregister(&data->watchdog_miscdev);
1218 if (data->watchdog_is_open) {
1219 dev_warn(&client->dev,
1220 "i2c client detached with watchdog open! "
1221 "Stopping watchdog.\n");
1222 watchdog_stop(data);
1223 }
1224 mutex_lock(&watchdog_data_mutex);
1225 list_del(&data->list);
1226 mutex_unlock(&watchdog_data_mutex);
1227 /* Tell the watchdog code the client is gone */
1228 mutex_lock(&data->watchdog_lock);
1229 data->client = NULL;
1230 mutex_unlock(&data->watchdog_lock);
1231 }
1232
1233 /* Check if registered in case we're called from fschmd_detect
1234 to cleanup after an error */
1235 if (data->hwmon_dev)
1236 hwmon_device_unregister(data->hwmon_dev);
1237
1238 device_remove_file(&client->dev, &dev_attr_alert_led);
1239 for (i = 0; i < (FSCHMD_NO_VOLT_SENSORS[data->kind]); i++)
1240 device_remove_file(&client->dev, &fschmd_attr[i].dev_attr);
1241 for (i = 0; i < (FSCHMD_NO_TEMP_SENSORS[data->kind] * 4); i++)
1242 device_remove_file(&client->dev,
1243 &fschmd_temp_attr[i].dev_attr);
1244 for (i = 0; i < (FSCHMD_NO_FAN_SENSORS[data->kind] * 5); i++)
1245 device_remove_file(&client->dev,
1246 &fschmd_fan_attr[i].dev_attr);
1247
1248 mutex_lock(&watchdog_data_mutex);
1249 kref_put(&data->kref, fschmd_release_resources);
1250 mutex_unlock(&watchdog_data_mutex);
1251
1252 return 0;
1253 }
1254
1255 static struct fschmd_data *fschmd_update_device(struct device *dev)
1256 {
1257 struct i2c_client *client = to_i2c_client(dev);
1258 struct fschmd_data *data = i2c_get_clientdata(client);
1259 int i;
1260
1261 mutex_lock(&data->update_lock);
1262
1263 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
1264
1265 for (i = 0; i < FSCHMD_NO_TEMP_SENSORS[data->kind]; i++) {
1266 data->temp_act[i] = i2c_smbus_read_byte_data(client,
1267 FSCHMD_REG_TEMP_ACT[data->kind][i]);
1268 data->temp_status[i] = i2c_smbus_read_byte_data(client,
1269 FSCHMD_REG_TEMP_STATE[data->kind][i]);
1270
1271 /* The fscpos doesn't have TEMP_LIMIT registers */
1272 if (FSCHMD_REG_TEMP_LIMIT[data->kind][i])
1273 data->temp_max[i] = i2c_smbus_read_byte_data(
1274 client,
1275 FSCHMD_REG_TEMP_LIMIT[data->kind][i]);
1276
1277 /* reset alarm if the alarm condition is gone,
1278 the chip doesn't do this itself */
1279 if ((data->temp_status[i] & FSCHMD_TEMP_ALARM_MASK) ==
1280 FSCHMD_TEMP_ALARM_MASK &&
1281 data->temp_act[i] < data->temp_max[i])
1282 i2c_smbus_write_byte_data(client,
1283 FSCHMD_REG_TEMP_STATE[data->kind][i],
1284 data->temp_status[i]);
1285 }
1286
1287 for (i = 0; i < FSCHMD_NO_FAN_SENSORS[data->kind]; i++) {
1288 data->fan_act[i] = i2c_smbus_read_byte_data(client,
1289 FSCHMD_REG_FAN_ACT[data->kind][i]);
1290 data->fan_status[i] = i2c_smbus_read_byte_data(client,
1291 FSCHMD_REG_FAN_STATE[data->kind][i]);
1292 data->fan_ripple[i] = i2c_smbus_read_byte_data(client,
1293 FSCHMD_REG_FAN_RIPPLE[data->kind][i]);
1294
1295 /* The fscpos third fan doesn't have a fan_min */
1296 if (FSCHMD_REG_FAN_MIN[data->kind][i])
1297 data->fan_min[i] = i2c_smbus_read_byte_data(
1298 client,
1299 FSCHMD_REG_FAN_MIN[data->kind][i]);
1300
1301 /* reset fan status if speed is back to > 0 */
1302 if ((data->fan_status[i] & FSCHMD_FAN_ALARM) &&
1303 data->fan_act[i])
1304 i2c_smbus_write_byte_data(client,
1305 FSCHMD_REG_FAN_STATE[data->kind][i],
1306 data->fan_status[i]);
1307 }
1308
1309 for (i = 0; i < FSCHMD_NO_VOLT_SENSORS[data->kind]; i++)
1310 data->volt[i] = i2c_smbus_read_byte_data(client,
1311 FSCHMD_REG_VOLT[data->kind][i]);
1312
1313 data->last_updated = jiffies;
1314 data->valid = 1;
1315 }
1316
1317 mutex_unlock(&data->update_lock);
1318
1319 return data;
1320 }
1321
1322 static int __init fschmd_init(void)
1323 {
1324 return i2c_add_driver(&fschmd_driver);
1325 }
1326
1327 static void __exit fschmd_exit(void)
1328 {
1329 i2c_del_driver(&fschmd_driver);
1330 }
1331
1332 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
1333 MODULE_DESCRIPTION("FSC Poseidon, Hermes, Scylla, Heracles, Heimdall, Hades "
1334 "and Syleus driver");
1335 MODULE_LICENSE("GPL");
1336
1337 module_init(fschmd_init);
1338 module_exit(fschmd_exit);
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