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[IA64] Fix warning in dma-mapping.c
[linux-2.6/mini2440.git] / drivers / hwmon / fschmd.c
blobea955edde87e5127fc4c7f57d7d0c0b51ed3b1e4
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 I2C_CLIENT_INSMOD_7(fscpos, fscher, fscscy, fschrc, fschmd, fschds, fscsyl);
60
61 /*
62 * The FSCHMD registers and other defines
63 */
64
65 /* chip identification */
66 #define FSCHMD_REG_IDENT_0 0x00
67 #define FSCHMD_REG_IDENT_1 0x01
68 #define FSCHMD_REG_IDENT_2 0x02
69 #define FSCHMD_REG_REVISION 0x03
70
71 /* global control and status */
72 #define FSCHMD_REG_EVENT_STATE 0x04
73 #define FSCHMD_REG_CONTROL 0x05
74
75 #define FSCHMD_CONTROL_ALERT_LED 0x01
76
77 /* watchdog */
78 static const u8 FSCHMD_REG_WDOG_CONTROL[7] =
79 { 0x21, 0x21, 0x21, 0x21, 0x21, 0x28, 0x28 };
80 static const u8 FSCHMD_REG_WDOG_STATE[7] =
81 { 0x23, 0x23, 0x23, 0x23, 0x23, 0x29, 0x29 };
82 static const u8 FSCHMD_REG_WDOG_PRESET[7] =
83 { 0x28, 0x28, 0x28, 0x28, 0x28, 0x2a, 0x2a };
84
85 #define FSCHMD_WDOG_CONTROL_TRIGGER 0x10
86 #define FSCHMD_WDOG_CONTROL_STARTED 0x10 /* the same as trigger */
87 #define FSCHMD_WDOG_CONTROL_STOP 0x20
88 #define FSCHMD_WDOG_CONTROL_RESOLUTION 0x40
89
90 #define FSCHMD_WDOG_STATE_CARDRESET 0x02
91
92 /* voltages, weird order is to keep the same order as the old drivers */
93 static const u8 FSCHMD_REG_VOLT[7][6] = {
94 { 0x45, 0x42, 0x48 }, /* pos */
95 { 0x45, 0x42, 0x48 }, /* her */
96 { 0x45, 0x42, 0x48 }, /* scy */
97 { 0x45, 0x42, 0x48 }, /* hrc */
98 { 0x45, 0x42, 0x48 }, /* hmd */
99 { 0x21, 0x20, 0x22 }, /* hds */
100 { 0x21, 0x20, 0x22, 0x23, 0x24, 0x25 }, /* syl */
101 };
102
103 static const int FSCHMD_NO_VOLT_SENSORS[7] = { 3, 3, 3, 3, 3, 3, 6 };
104
105 /* minimum pwm at which the fan is driven (pwm can by increased depending on
106 the temp. Notice that for the scy some fans share there minimum speed.
107 Also notice that with the scy the sensor order is different than with the
108 other chips, this order was in the 2.4 driver and kept for consistency. */
109 static const u8 FSCHMD_REG_FAN_MIN[7][7] = {
110 { 0x55, 0x65 }, /* pos */
111 { 0x55, 0x65, 0xb5 }, /* her */
112 { 0x65, 0x65, 0x55, 0xa5, 0x55, 0xa5 }, /* scy */
113 { 0x55, 0x65, 0xa5, 0xb5 }, /* hrc */
114 { 0x55, 0x65, 0xa5, 0xb5, 0xc5 }, /* hmd */
115 { 0x55, 0x65, 0xa5, 0xb5, 0xc5 }, /* hds */
116 { 0x54, 0x64, 0x74, 0x84, 0x94, 0xa4, 0xb4 }, /* syl */
117 };
118
119 /* actual fan speed */
120 static const u8 FSCHMD_REG_FAN_ACT[7][7] = {
121 { 0x0e, 0x6b, 0xab }, /* pos */
122 { 0x0e, 0x6b, 0xbb }, /* her */
123 { 0x6b, 0x6c, 0x0e, 0xab, 0x5c, 0xbb }, /* scy */
124 { 0x0e, 0x6b, 0xab, 0xbb }, /* hrc */
125 { 0x5b, 0x6b, 0xab, 0xbb, 0xcb }, /* hmd */
126 { 0x5b, 0x6b, 0xab, 0xbb, 0xcb }, /* hds */
127 { 0x57, 0x67, 0x77, 0x87, 0x97, 0xa7, 0xb7 }, /* syl */
128 };
129
130 /* fan status registers */
131 static const u8 FSCHMD_REG_FAN_STATE[7][7] = {
132 { 0x0d, 0x62, 0xa2 }, /* pos */
133 { 0x0d, 0x62, 0xb2 }, /* her */
134 { 0x62, 0x61, 0x0d, 0xa2, 0x52, 0xb2 }, /* scy */
135 { 0x0d, 0x62, 0xa2, 0xb2 }, /* hrc */
136 { 0x52, 0x62, 0xa2, 0xb2, 0xc2 }, /* hmd */
137 { 0x52, 0x62, 0xa2, 0xb2, 0xc2 }, /* hds */
138 { 0x50, 0x60, 0x70, 0x80, 0x90, 0xa0, 0xb0 }, /* syl */
139 };
140
141 /* fan ripple / divider registers */
142 static const u8 FSCHMD_REG_FAN_RIPPLE[7][7] = {
143 { 0x0f, 0x6f, 0xaf }, /* pos */
144 { 0x0f, 0x6f, 0xbf }, /* her */
145 { 0x6f, 0x6f, 0x0f, 0xaf, 0x0f, 0xbf }, /* scy */
146 { 0x0f, 0x6f, 0xaf, 0xbf }, /* hrc */
147 { 0x5f, 0x6f, 0xaf, 0xbf, 0xcf }, /* hmd */
148 { 0x5f, 0x6f, 0xaf, 0xbf, 0xcf }, /* hds */
149 { 0x56, 0x66, 0x76, 0x86, 0x96, 0xa6, 0xb6 }, /* syl */
150 };
151
152 static const int FSCHMD_NO_FAN_SENSORS[7] = { 3, 3, 6, 4, 5, 5, 7 };
153
154 /* Fan status register bitmasks */
155 #define FSCHMD_FAN_ALARM 0x04 /* called fault by FSC! */
156 #define FSCHMD_FAN_NOT_PRESENT 0x08
157 #define FSCHMD_FAN_DISABLED 0x80
158
159
160 /* actual temperature registers */
161 static const u8 FSCHMD_REG_TEMP_ACT[7][11] = {
162 { 0x64, 0x32, 0x35 }, /* pos */
163 { 0x64, 0x32, 0x35 }, /* her */
164 { 0x64, 0xD0, 0x32, 0x35 }, /* scy */
165 { 0x64, 0x32, 0x35 }, /* hrc */
166 { 0x70, 0x80, 0x90, 0xd0, 0xe0 }, /* hmd */
167 { 0x70, 0x80, 0x90, 0xd0, 0xe0 }, /* hds */
168 { 0x58, 0x68, 0x78, 0x88, 0x98, 0xa8, /* syl */
169 0xb8, 0xc8, 0xd8, 0xe8, 0xf8 },
170 };
171
172 /* temperature state registers */
173 static const u8 FSCHMD_REG_TEMP_STATE[7][11] = {
174 { 0x71, 0x81, 0x91 }, /* pos */
175 { 0x71, 0x81, 0x91 }, /* her */
176 { 0x71, 0xd1, 0x81, 0x91 }, /* scy */
177 { 0x71, 0x81, 0x91 }, /* hrc */
178 { 0x71, 0x81, 0x91, 0xd1, 0xe1 }, /* hmd */
179 { 0x71, 0x81, 0x91, 0xd1, 0xe1 }, /* hds */
180 { 0x59, 0x69, 0x79, 0x89, 0x99, 0xa9, /* syl */
181 0xb9, 0xc9, 0xd9, 0xe9, 0xf9 },
182 };
183
184 /* temperature high limit registers, FSC does not document these. Proven to be
185 there with field testing on the fscher and fschrc, already supported / used
186 in the fscscy 2.4 driver. FSC has confirmed that the fschmd has registers
187 at these addresses, but doesn't want to confirm they are the same as with
188 the fscher?? */
189 static const u8 FSCHMD_REG_TEMP_LIMIT[7][11] = {
190 { 0, 0, 0 }, /* pos */
191 { 0x76, 0x86, 0x96 }, /* her */
192 { 0x76, 0xd6, 0x86, 0x96 }, /* scy */
193 { 0x76, 0x86, 0x96 }, /* hrc */
194 { 0x76, 0x86, 0x96, 0xd6, 0xe6 }, /* hmd */
195 { 0x76, 0x86, 0x96, 0xd6, 0xe6 }, /* hds */
196 { 0x5a, 0x6a, 0x7a, 0x8a, 0x9a, 0xaa, /* syl */
197 0xba, 0xca, 0xda, 0xea, 0xfa },
198 };
199
200 /* These were found through experimenting with an fscher, currently they are
201 not used, but we keep them around for future reference.
202 On the fscsyl AUTOP1 lives at 0x#c (so 0x5c for fan1, 0x6c for fan2, etc),
203 AUTOP2 lives at 0x#e, and 0x#1 is a bitmask defining which temps influence
204 the fan speed.
205 static const u8 FSCHER_REG_TEMP_AUTOP1[] = { 0x73, 0x83, 0x93 };
206 static const u8 FSCHER_REG_TEMP_AUTOP2[] = { 0x75, 0x85, 0x95 }; */
207
208 static const int FSCHMD_NO_TEMP_SENSORS[7] = { 3, 3, 4, 3, 5, 5, 11 };
209
210 /* temp status register bitmasks */
211 #define FSCHMD_TEMP_WORKING 0x01
212 #define FSCHMD_TEMP_ALERT 0x02
213 #define FSCHMD_TEMP_DISABLED 0x80
214 /* there only really is an alarm if the sensor is working and alert == 1 */
215 #define FSCHMD_TEMP_ALARM_MASK \
216 (FSCHMD_TEMP_WORKING | FSCHMD_TEMP_ALERT)
217
218 /*
219 * Functions declarations
220 */
221
222 static int fschmd_probe(struct i2c_client *client,
223 const struct i2c_device_id *id);
224 static int fschmd_detect(struct i2c_client *client, int kind,
225 struct i2c_board_info *info);
226 static int fschmd_remove(struct i2c_client *client);
227 static struct fschmd_data *fschmd_update_device(struct device *dev);
228
229 /*
230 * Driver data (common to all clients)
231 */
232
233 static const struct i2c_device_id fschmd_id[] = {
234 { "fscpos", fscpos },
235 { "fscher", fscher },
236 { "fscscy", fscscy },
237 { "fschrc", fschrc },
238 { "fschmd", fschmd },
239 { "fschds", fschds },
240 { "fscsyl", fscsyl },
241 { }
242 };
243 MODULE_DEVICE_TABLE(i2c, fschmd_id);
244
245 static struct i2c_driver fschmd_driver = {
246 .class = I2C_CLASS_HWMON,
247 .driver = {
248 .name = "fschmd",
249 },
250 .probe = fschmd_probe,
251 .remove = fschmd_remove,
252 .id_table = fschmd_id,
253 .detect = fschmd_detect,
254 .address_data = &addr_data,
255 };
256
257 /*
258 * Client data (each client gets its own)
259 */
260
261 struct fschmd_data {
262 struct i2c_client *client;
263 struct device *hwmon_dev;
264 struct mutex update_lock;
265 struct mutex watchdog_lock;
266 struct list_head list; /* member of the watchdog_data_list */
267 struct kref kref;
268 struct miscdevice watchdog_miscdev;
269 int kind;
270 unsigned long watchdog_is_open;
271 char watchdog_expect_close;
272 char watchdog_name[10]; /* must be unique to avoid sysfs conflict */
273 char valid; /* zero until following fields are valid */
274 unsigned long last_updated; /* in jiffies */
275
276 /* register values */
277 u8 revision; /* chip revision */
278 u8 global_control; /* global control register */
279 u8 watchdog_control; /* watchdog control register */
280 u8 watchdog_state; /* watchdog status register */
281 u8 watchdog_preset; /* watchdog counter preset on trigger val */
282 u8 volt[6]; /* voltage */
283 u8 temp_act[11]; /* temperature */
284 u8 temp_status[11]; /* status of sensor */
285 u8 temp_max[11]; /* high temp limit, notice: undocumented! */
286 u8 fan_act[7]; /* fans revolutions per second */
287 u8 fan_status[7]; /* fan status */
288 u8 fan_min[7]; /* fan min value for rps */
289 u8 fan_ripple[7]; /* divider for rps */
290 };
291
292 /* Global variables to hold information read from special DMI tables, which are
293 available on FSC machines with an fscher or later chip. There is no need to
294 protect these with a lock as they are only modified from our attach function
295 which always gets called with the i2c-core lock held and never accessed
296 before the attach function is done with them. */
297 static int dmi_mult[6] = { 490, 200, 100, 100, 200, 100 };
298 static int dmi_offset[6] = { 0, 0, 0, 0, 0, 0 };
299 static int dmi_vref = -1;
300
301 /* Somewhat ugly :( global data pointer list with all fschmd devices, so that
302 we can find our device data as when using misc_register there is no other
303 method to get to ones device data from the open fop. */
304 static LIST_HEAD(watchdog_data_list);
305 /* Note this lock not only protect list access, but also data.kref access */
306 static DEFINE_MUTEX(watchdog_data_mutex);
307
308 /* Release our data struct when we're detached from the i2c client *and* all
309 references to our watchdog device are released */
310 static void fschmd_release_resources(struct kref *ref)
311 {
312 struct fschmd_data *data = container_of(ref, struct fschmd_data, kref);
313 kfree(data);
314 }
315
316 /*
317 * Sysfs attr show / store functions
318 */
319
320 static ssize_t show_in_value(struct device *dev,
321 struct device_attribute *devattr, char *buf)
322 {
323 const int max_reading[3] = { 14200, 6600, 3300 };
324 int index = to_sensor_dev_attr(devattr)->index;
325 struct fschmd_data *data = fschmd_update_device(dev);
326
327 /* fscher / fschrc - 1 as data->kind is an array index, not a chips */
328 if (data->kind == (fscher - 1) || data->kind >= (fschrc - 1))
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
339 static 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
348 static 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
357 static 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
375 static 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
388 static 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
404 static 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
413 static 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
423 static 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
461 static 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
473 static 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
486 static 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 - 1)
495 val = val / 2 + 128;
496
497 return sprintf(buf, "%d\n", val);
498 }
499
500 static 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 - 1) {
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 */
527 static 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
538 static 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
563 static DEVICE_ATTR(alert_led, 0644, show_alert_led, store_alert_led);
564
565 static 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
574 static 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
621 static 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
671 static 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
708 leave:
709 mutex_unlock(&data->watchdog_lock);
710 return ret;
711 }
712
713 static 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
727 static 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);
741 leave:
742 mutex_unlock(&data->watchdog_lock);
743 return ret;
744 }
745
746 static 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);
762 leave:
763 mutex_unlock(&data->watchdog_lock);
764 return ret;
765 }
766
767 static int watchdog_open(struct inode *inode, struct file *filp)
768 {
769 struct fschmd_data *pos, *data = NULL;
770
771 /* We get called from drivers/char/misc.c with misc_mtx hold, and we
772 call misc_register() from fschmd_probe() with watchdog_data_mutex
773 hold, as misc_register() takes the misc_mtx lock, this is a possible
774 deadlock, so we use mutex_trylock here. */
775 if (!mutex_trylock(&watchdog_data_mutex))
776 return -ERESTARTSYS;
777 list_for_each_entry(pos, &watchdog_data_list, list) {
778 if (pos->watchdog_miscdev.minor == iminor(inode)) {
779 data = pos;
780 break;
781 }
782 }
783 /* Note we can never not have found data, so we don't check for this */
784 kref_get(&data->kref);
785 mutex_unlock(&watchdog_data_mutex);
786
787 if (test_and_set_bit(0, &data->watchdog_is_open))
788 return -EBUSY;
789
790 /* Start the watchdog */
791 watchdog_trigger(data);
792 filp->private_data = data;
793
794 return nonseekable_open(inode, filp);
795 }
796
797 static int watchdog_release(struct inode *inode, struct file *filp)
798 {
799 struct fschmd_data *data = filp->private_data;
800
801 if (data->watchdog_expect_close) {
802 watchdog_stop(data);
803 data->watchdog_expect_close = 0;
804 } else {
805 watchdog_trigger(data);
806 dev_crit(&data->client->dev,
807 "unexpected close, not stopping watchdog!\n");
808 }
809
810 clear_bit(0, &data->watchdog_is_open);
811
812 mutex_lock(&watchdog_data_mutex);
813 kref_put(&data->kref, fschmd_release_resources);
814 mutex_unlock(&watchdog_data_mutex);
815
816 return 0;
817 }
818
819 static ssize_t watchdog_write(struct file *filp, const char __user *buf,
820 size_t count, loff_t *offset)
821 {
822 size_t ret;
823 struct fschmd_data *data = filp->private_data;
824
825 if (count) {
826 if (!nowayout) {
827 size_t i;
828
829 /* Clear it in case it was set with a previous write */
830 data->watchdog_expect_close = 0;
831
832 for (i = 0; i != count; i++) {
833 char c;
834 if (get_user(c, buf + i))
835 return -EFAULT;
836 if (c == 'V')
837 data->watchdog_expect_close = 1;
838 }
839 }
840 ret = watchdog_trigger(data);
841 if (ret < 0)
842 return ret;
843 }
844 return count;
845 }
846
847 static int watchdog_ioctl(struct inode *inode, struct file *filp,
848 unsigned int cmd, unsigned long arg)
849 {
850 static struct watchdog_info ident = {
851 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
852 WDIOF_CARDRESET,
853 .identity = "FSC watchdog"
854 };
855 int i, ret = 0;
856 struct fschmd_data *data = filp->private_data;
857
858 switch (cmd) {
859 case WDIOC_GETSUPPORT:
860 ident.firmware_version = data->revision;
861 if (!nowayout)
862 ident.options |= WDIOF_MAGICCLOSE;
863 if (copy_to_user((void __user *)arg, &ident, sizeof(ident)))
864 ret = -EFAULT;
865 break;
866
867 case WDIOC_GETSTATUS:
868 ret = put_user(0, (int __user *)arg);
869 break;
870
871 case WDIOC_GETBOOTSTATUS:
872 if (data->watchdog_state & FSCHMD_WDOG_STATE_CARDRESET)
873 ret = put_user(WDIOF_CARDRESET, (int __user *)arg);
874 else
875 ret = put_user(0, (int __user *)arg);
876 break;
877
878 case WDIOC_KEEPALIVE:
879 ret = watchdog_trigger(data);
880 break;
881
882 case WDIOC_GETTIMEOUT:
883 i = watchdog_get_timeout(data);
884 ret = put_user(i, (int __user *)arg);
885 break;
886
887 case WDIOC_SETTIMEOUT:
888 if (get_user(i, (int __user *)arg)) {
889 ret = -EFAULT;
890 break;
891 }
892 ret = watchdog_set_timeout(data, i);
893 if (ret > 0)
894 ret = put_user(ret, (int __user *)arg);
895 break;
896
897 case WDIOC_SETOPTIONS:
898 if (get_user(i, (int __user *)arg)) {
899 ret = -EFAULT;
900 break;
901 }
902
903 if (i & WDIOS_DISABLECARD)
904 ret = watchdog_stop(data);
905 else if (i & WDIOS_ENABLECARD)
906 ret = watchdog_trigger(data);
907 else
908 ret = -EINVAL;
909
910 break;
911 default:
912 ret = -ENOTTY;
913 }
914
915 return ret;
916 }
917
918 static struct file_operations watchdog_fops = {
919 .owner = THIS_MODULE,
920 .llseek = no_llseek,
921 .open = watchdog_open,
922 .release = watchdog_release,
923 .write = watchdog_write,
924 .ioctl = watchdog_ioctl,
925 };
926
927
928 /*
929 * Detect, register, unregister and update device functions
930 */
931
932 /* DMI decode routine to read voltage scaling factors from special DMI tables,
933 which are available on FSC machines with an fscher or later chip. */
934 static void fschmd_dmi_decode(const struct dmi_header *header, void *dummy)
935 {
936 int i, mult[3] = { 0 }, offset[3] = { 0 }, vref = 0, found = 0;
937
938 /* dmi code ugliness, we get passed the address of the contents of
939 a complete DMI record, but in the form of a dmi_header pointer, in
940 reality this address holds header->length bytes of which the header
941 are the first 4 bytes */
942 u8 *dmi_data = (u8 *)header;
943
944 /* We are looking for OEM-specific type 185 */
945 if (header->type != 185)
946 return;
947
948 /* we are looking for what Siemens calls "subtype" 19, the subtype
949 is stored in byte 5 of the dmi block */
950 if (header->length < 5 || dmi_data[4] != 19)
951 return;
952
953 /* After the subtype comes 1 unknown byte and then blocks of 5 bytes,
954 consisting of what Siemens calls an "Entity" number, followed by
955 2 16-bit words in LSB first order */
956 for (i = 6; (i + 4) < header->length; i += 5) {
957 /* entity 1 - 3: voltage multiplier and offset */
958 if (dmi_data[i] >= 1 && dmi_data[i] <= 3) {
959 /* Our in sensors order and the DMI order differ */
960 const int shuffle[3] = { 1, 0, 2 };
961 int in = shuffle[dmi_data[i] - 1];
962
963 /* Check for twice the same entity */
964 if (found & (1 << in))
965 return;
966
967 mult[in] = dmi_data[i + 1] | (dmi_data[i + 2] << 8);
968 offset[in] = dmi_data[i + 3] | (dmi_data[i + 4] << 8);
969
970 found |= 1 << in;
971 }
972
973 /* entity 7: reference voltage */
974 if (dmi_data[i] == 7) {
975 /* Check for twice the same entity */
976 if (found & 0x08)
977 return;
978
979 vref = dmi_data[i + 1] | (dmi_data[i + 2] << 8);
980
981 found |= 0x08;
982 }
983 }
984
985 if (found == 0x0F) {
986 for (i = 0; i < 3; i++) {
987 dmi_mult[i] = mult[i] * 10;
988 dmi_offset[i] = offset[i] * 10;
989 }
990 /* According to the docs there should be separate dmi entries
991 for the mult's and offsets of in3-5 of the syl, but on
992 my test machine these are not present */
993 dmi_mult[3] = dmi_mult[2];
994 dmi_mult[4] = dmi_mult[1];
995 dmi_mult[5] = dmi_mult[2];
996 dmi_offset[3] = dmi_offset[2];
997 dmi_offset[4] = dmi_offset[1];
998 dmi_offset[5] = dmi_offset[2];
999 dmi_vref = vref;
1000 }
1001 }
1002
1003 static int fschmd_detect(struct i2c_client *client, int kind,
1004 struct i2c_board_info *info)
1005 {
1006 struct i2c_adapter *adapter = client->adapter;
1007
1008 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
1009 return -ENODEV;
1010
1011 /* Detect & Identify the chip */
1012 if (kind <= 0) {
1013 char id[4];
1014
1015 id[0] = i2c_smbus_read_byte_data(client,
1016 FSCHMD_REG_IDENT_0);
1017 id[1] = i2c_smbus_read_byte_data(client,
1018 FSCHMD_REG_IDENT_1);
1019 id[2] = i2c_smbus_read_byte_data(client,
1020 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
1041 strlcpy(info->type, fschmd_id[kind - 1].name, I2C_NAME_SIZE);
1042
1043 return 0;
1044 }
1045
1046 static int fschmd_probe(struct i2c_client *client,
1047 const struct i2c_device_id *id)
1048 {
1049 struct fschmd_data *data;
1050 const char * const names[7] = { "Poseidon", "Hermes", "Scylla",
1051 "Heracles", "Heimdall", "Hades", "Syleus" };
1052 const int watchdog_minors[] = { WATCHDOG_MINOR, 212, 213, 214, 215 };
1053 int i, err;
1054 enum chips kind = id->driver_data;
1055
1056 data = kzalloc(sizeof(struct fschmd_data), GFP_KERNEL);
1057 if (!data)
1058 return -ENOMEM;
1059
1060 i2c_set_clientdata(client, data);
1061 mutex_init(&data->update_lock);
1062 mutex_init(&data->watchdog_lock);
1063 INIT_LIST_HEAD(&data->list);
1064 kref_init(&data->kref);
1065 /* Store client pointer in our data struct for watchdog usage
1066 (where the client is found through a data ptr instead of the
1067 otherway around) */
1068 data->client = client;
1069
1070 if (kind == fscpos) {
1071 /* The Poseidon has hardwired temp limits, fill these
1072 in for the alarm resetting code */
1073 data->temp_max[0] = 70 + 128;
1074 data->temp_max[1] = 50 + 128;
1075 data->temp_max[2] = 50 + 128;
1076 }
1077
1078 /* Read the special DMI table for fscher and newer chips */
1079 if ((kind == fscher || kind >= fschrc) && dmi_vref == -1) {
1080 dmi_walk(fschmd_dmi_decode, NULL);
1081 if (dmi_vref == -1) {
1082 dev_warn(&client->dev,
1083 "Couldn't get voltage scaling factors from "
1084 "BIOS DMI table, using builtin defaults\n");
1085 dmi_vref = 33;
1086 }
1087 }
1088
1089 /* i2c kind goes from 1-6, we want from 0-5 to address arrays */
1090 data->kind = kind - 1;
1091
1092 /* Read in some never changing registers */
1093 data->revision = i2c_smbus_read_byte_data(client, FSCHMD_REG_REVISION);
1094 data->global_control = i2c_smbus_read_byte_data(client,
1095 FSCHMD_REG_CONTROL);
1096 data->watchdog_control = i2c_smbus_read_byte_data(client,
1097 FSCHMD_REG_WDOG_CONTROL[data->kind]);
1098 data->watchdog_state = i2c_smbus_read_byte_data(client,
1099 FSCHMD_REG_WDOG_STATE[data->kind]);
1100 data->watchdog_preset = i2c_smbus_read_byte_data(client,
1101 FSCHMD_REG_WDOG_PRESET[data->kind]);
1102
1103 err = device_create_file(&client->dev, &dev_attr_alert_led);
1104 if (err)
1105 goto exit_detach;
1106
1107 for (i = 0; i < FSCHMD_NO_VOLT_SENSORS[data->kind]; i++) {
1108 err = device_create_file(&client->dev,
1109 &fschmd_attr[i].dev_attr);
1110 if (err)
1111 goto exit_detach;
1112 }
1113
1114 for (i = 0; i < (FSCHMD_NO_TEMP_SENSORS[data->kind] * 4); i++) {
1115 /* Poseidon doesn't have TEMP_LIMIT registers */
1116 if (kind == fscpos && fschmd_temp_attr[i].dev_attr.show ==
1117 show_temp_max)
1118 continue;
1119
1120 if (kind == fscsyl) {
1121 if (i % 4 == 0)
1122 data->temp_status[i / 4] =
1123 i2c_smbus_read_byte_data(client,
1124 FSCHMD_REG_TEMP_STATE
1125 [data->kind][i / 4]);
1126 if (data->temp_status[i / 4] & FSCHMD_TEMP_DISABLED)
1127 continue;
1128 }
1129
1130 err = device_create_file(&client->dev,
1131 &fschmd_temp_attr[i].dev_attr);
1132 if (err)
1133 goto exit_detach;
1134 }
1135
1136 for (i = 0; i < (FSCHMD_NO_FAN_SENSORS[data->kind] * 5); i++) {
1137 /* Poseidon doesn't have a FAN_MIN register for its 3rd fan */
1138 if (kind == fscpos &&
1139 !strcmp(fschmd_fan_attr[i].dev_attr.attr.name,
1140 "pwm3_auto_point1_pwm"))
1141 continue;
1142
1143 if (kind == fscsyl) {
1144 if (i % 5 == 0)
1145 data->fan_status[i / 5] =
1146 i2c_smbus_read_byte_data(client,
1147 FSCHMD_REG_FAN_STATE
1148 [data->kind][i / 5]);
1149 if (data->fan_status[i / 5] & FSCHMD_FAN_DISABLED)
1150 continue;
1151 }
1152
1153 err = device_create_file(&client->dev,
1154 &fschmd_fan_attr[i].dev_attr);
1155 if (err)
1156 goto exit_detach;
1157 }
1158
1159 data->hwmon_dev = hwmon_device_register(&client->dev);
1160 if (IS_ERR(data->hwmon_dev)) {
1161 err = PTR_ERR(data->hwmon_dev);
1162 data->hwmon_dev = NULL;
1163 goto exit_detach;
1164 }
1165
1166 /* We take the data_mutex lock early so that watchdog_open() cannot
1167 run when misc_register() has completed, but we've not yet added
1168 our data to the watchdog_data_list (and set the default timeout) */
1169 mutex_lock(&watchdog_data_mutex);
1170 for (i = 0; i < ARRAY_SIZE(watchdog_minors); i++) {
1171 /* Register our watchdog part */
1172 snprintf(data->watchdog_name, sizeof(data->watchdog_name),
1173 "watchdog%c", (i == 0) ? '\0' : ('0' + i));
1174 data->watchdog_miscdev.name = data->watchdog_name;
1175 data->watchdog_miscdev.fops = &watchdog_fops;
1176 data->watchdog_miscdev.minor = watchdog_minors[i];
1177 err = misc_register(&data->watchdog_miscdev);
1178 if (err == -EBUSY)
1179 continue;
1180 if (err) {
1181 data->watchdog_miscdev.minor = 0;
1182 dev_err(&client->dev,
1183 "Registering watchdog chardev: %d\n", err);
1184 break;
1185 }
1186
1187 list_add(&data->list, &watchdog_data_list);
1188 watchdog_set_timeout(data, 60);
1189 dev_info(&client->dev,
1190 "Registered watchdog chardev major 10, minor: %d\n",
1191 watchdog_minors[i]);
1192 break;
1193 }
1194 if (i == ARRAY_SIZE(watchdog_minors)) {
1195 data->watchdog_miscdev.minor = 0;
1196 dev_warn(&client->dev, "Couldn't register watchdog chardev "
1197 "(due to no free minor)\n");
1198 }
1199 mutex_unlock(&watchdog_data_mutex);
1200
1201 dev_info(&client->dev, "Detected FSC %s chip, revision: %d\n",
1202 names[data->kind], (int) data->revision);
1203
1204 return 0;
1205
1206 exit_detach:
1207 fschmd_remove(client); /* will also free data for us */
1208 return err;
1209 }
1210
1211 static int fschmd_remove(struct i2c_client *client)
1212 {
1213 struct fschmd_data *data = i2c_get_clientdata(client);
1214 int i;
1215
1216 /* Unregister the watchdog (if registered) */
1217 if (data->watchdog_miscdev.minor) {
1218 misc_deregister(&data->watchdog_miscdev);
1219 if (data->watchdog_is_open) {
1220 dev_warn(&client->dev,
1221 "i2c client detached with watchdog open! "
1222 "Stopping watchdog.\n");
1223 watchdog_stop(data);
1224 }
1225 mutex_lock(&watchdog_data_mutex);
1226 list_del(&data->list);
1227 mutex_unlock(&watchdog_data_mutex);
1228 /* Tell the watchdog code the client is gone */
1229 mutex_lock(&data->watchdog_lock);
1230 data->client = NULL;
1231 mutex_unlock(&data->watchdog_lock);
1232 }
1233
1234 /* Check if registered in case we're called from fschmd_detect
1235 to cleanup after an error */
1236 if (data->hwmon_dev)
1237 hwmon_device_unregister(data->hwmon_dev);
1238
1239 device_remove_file(&client->dev, &dev_attr_alert_led);
1240 for (i = 0; i < (FSCHMD_NO_VOLT_SENSORS[data->kind]); i++)
1241 device_remove_file(&client->dev, &fschmd_attr[i].dev_attr);
1242 for (i = 0; i < (FSCHMD_NO_TEMP_SENSORS[data->kind] * 4); i++)
1243 device_remove_file(&client->dev,
1244 &fschmd_temp_attr[i].dev_attr);
1245 for (i = 0; i < (FSCHMD_NO_FAN_SENSORS[data->kind] * 5); i++)
1246 device_remove_file(&client->dev,
1247 &fschmd_fan_attr[i].dev_attr);
1248
1249 mutex_lock(&watchdog_data_mutex);
1250 kref_put(&data->kref, fschmd_release_resources);
1251 mutex_unlock(&watchdog_data_mutex);
1252
1253 return 0;
1254 }
1255
1256 static struct fschmd_data *fschmd_update_device(struct device *dev)
1257 {
1258 struct i2c_client *client = to_i2c_client(dev);
1259 struct fschmd_data *data = i2c_get_clientdata(client);
1260 int i;
1261
1262 mutex_lock(&data->update_lock);
1263
1264 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
1265
1266 for (i = 0; i < FSCHMD_NO_TEMP_SENSORS[data->kind]; i++) {
1267 data->temp_act[i] = i2c_smbus_read_byte_data(client,
1268 FSCHMD_REG_TEMP_ACT[data->kind][i]);
1269 data->temp_status[i] = i2c_smbus_read_byte_data(client,
1270 FSCHMD_REG_TEMP_STATE[data->kind][i]);
1271
1272 /* The fscpos doesn't have TEMP_LIMIT registers */
1273 if (FSCHMD_REG_TEMP_LIMIT[data->kind][i])
1274 data->temp_max[i] = i2c_smbus_read_byte_data(
1275 client,
1276 FSCHMD_REG_TEMP_LIMIT[data->kind][i]);
1277
1278 /* reset alarm if the alarm condition is gone,
1279 the chip doesn't do this itself */
1280 if ((data->temp_status[i] & FSCHMD_TEMP_ALARM_MASK) ==
1281 FSCHMD_TEMP_ALARM_MASK &&
1282 data->temp_act[i] < data->temp_max[i])
1283 i2c_smbus_write_byte_data(client,
1284 FSCHMD_REG_TEMP_STATE[data->kind][i],
1285 data->temp_status[i]);
1286 }
1287
1288 for (i = 0; i < FSCHMD_NO_FAN_SENSORS[data->kind]; i++) {
1289 data->fan_act[i] = i2c_smbus_read_byte_data(client,
1290 FSCHMD_REG_FAN_ACT[data->kind][i]);
1291 data->fan_status[i] = i2c_smbus_read_byte_data(client,
1292 FSCHMD_REG_FAN_STATE[data->kind][i]);
1293 data->fan_ripple[i] = i2c_smbus_read_byte_data(client,
1294 FSCHMD_REG_FAN_RIPPLE[data->kind][i]);
1295
1296 /* The fscpos third fan doesn't have a fan_min */
1297 if (FSCHMD_REG_FAN_MIN[data->kind][i])
1298 data->fan_min[i] = i2c_smbus_read_byte_data(
1299 client,
1300 FSCHMD_REG_FAN_MIN[data->kind][i]);
1301
1302 /* reset fan status if speed is back to > 0 */
1303 if ((data->fan_status[i] & FSCHMD_FAN_ALARM) &&
1304 data->fan_act[i])
1305 i2c_smbus_write_byte_data(client,
1306 FSCHMD_REG_FAN_STATE[data->kind][i],
1307 data->fan_status[i]);
1308 }
1309
1310 for (i = 0; i < FSCHMD_NO_VOLT_SENSORS[data->kind]; i++)
1311 data->volt[i] = i2c_smbus_read_byte_data(client,
1312 FSCHMD_REG_VOLT[data->kind][i]);
1313
1314 data->last_updated = jiffies;
1315 data->valid = 1;
1316 }
1317
1318 mutex_unlock(&data->update_lock);
1319
1320 return data;
1321 }
1322
1323 static int __init fschmd_init(void)
1324 {
1325 return i2c_add_driver(&fschmd_driver);
1326 }
1327
1328 static void __exit fschmd_exit(void)
1329 {
1330 i2c_del_driver(&fschmd_driver);
1331 }
1332
1333 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
1334 MODULE_DESCRIPTION("FSC Poseidon, Hermes, Scylla, Heracles, Heimdall, Hades "
1335 "and Syleus driver");
1336 MODULE_LICENSE("GPL");
1337
1338 module_init(fschmd_init);
1339 module_exit(fschmd_exit);
Support for the Chinese Samsung S3C2440 based development boards