Merge branch 'x86-cache-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-block.git] / drivers / hwmon / amc6821.c
1 /*
2  * amc6821.c - Part of lm_sensors, Linux kernel modules for hardware
3  *             monitoring
4  * Copyright (C) 2009 T. Mertelj <tomaz.mertelj@guest.arnes.si>
5  *
6  * Based on max6650.c:
7  * Copyright (C) 2007 Hans J. Koch <hjk@hansjkoch.de>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22  */
23
24 #include <linux/kernel.h>       /* Needed for KERN_INFO */
25 #include <linux/module.h>
26 #include <linux/init.h>
27 #include <linux/slab.h>
28 #include <linux/jiffies.h>
29 #include <linux/i2c.h>
30 #include <linux/hwmon.h>
31 #include <linux/hwmon-sysfs.h>
32 #include <linux/err.h>
33 #include <linux/mutex.h>
34
35 /*
36  * Addresses to scan.
37  */
38
39 static const unsigned short normal_i2c[] = {0x18, 0x19, 0x1a, 0x2c, 0x2d, 0x2e,
40         0x4c, 0x4d, 0x4e, I2C_CLIENT_END};
41
42 /*
43  * Insmod parameters
44  */
45
46 static int pwminv;      /*Inverted PWM output. */
47 module_param(pwminv, int, S_IRUGO);
48
49 static int init = 1; /*Power-on initialization.*/
50 module_param(init, int, S_IRUGO);
51
52 enum chips { amc6821 };
53
54 #define AMC6821_REG_DEV_ID 0x3D
55 #define AMC6821_REG_COMP_ID 0x3E
56 #define AMC6821_REG_CONF1 0x00
57 #define AMC6821_REG_CONF2 0x01
58 #define AMC6821_REG_CONF3 0x3F
59 #define AMC6821_REG_CONF4 0x04
60 #define AMC6821_REG_STAT1 0x02
61 #define AMC6821_REG_STAT2 0x03
62 #define AMC6821_REG_TDATA_LOW 0x08
63 #define AMC6821_REG_TDATA_HI 0x09
64 #define AMC6821_REG_LTEMP_HI 0x0A
65 #define AMC6821_REG_RTEMP_HI 0x0B
66 #define AMC6821_REG_LTEMP_LIMIT_MIN 0x15
67 #define AMC6821_REG_LTEMP_LIMIT_MAX 0x14
68 #define AMC6821_REG_RTEMP_LIMIT_MIN 0x19
69 #define AMC6821_REG_RTEMP_LIMIT_MAX 0x18
70 #define AMC6821_REG_LTEMP_CRIT 0x1B
71 #define AMC6821_REG_RTEMP_CRIT 0x1D
72 #define AMC6821_REG_PSV_TEMP 0x1C
73 #define AMC6821_REG_DCY 0x22
74 #define AMC6821_REG_LTEMP_FAN_CTRL 0x24
75 #define AMC6821_REG_RTEMP_FAN_CTRL 0x25
76 #define AMC6821_REG_DCY_LOW_TEMP 0x21
77
78 #define AMC6821_REG_TACH_LLIMITL 0x10
79 #define AMC6821_REG_TACH_LLIMITH 0x11
80 #define AMC6821_REG_TACH_HLIMITL 0x12
81 #define AMC6821_REG_TACH_HLIMITH 0x13
82
83 #define AMC6821_CONF1_START 0x01
84 #define AMC6821_CONF1_FAN_INT_EN 0x02
85 #define AMC6821_CONF1_FANIE 0x04
86 #define AMC6821_CONF1_PWMINV 0x08
87 #define AMC6821_CONF1_FAN_FAULT_EN 0x10
88 #define AMC6821_CONF1_FDRC0 0x20
89 #define AMC6821_CONF1_FDRC1 0x40
90 #define AMC6821_CONF1_THERMOVIE 0x80
91
92 #define AMC6821_CONF2_PWM_EN 0x01
93 #define AMC6821_CONF2_TACH_MODE 0x02
94 #define AMC6821_CONF2_TACH_EN 0x04
95 #define AMC6821_CONF2_RTFIE 0x08
96 #define AMC6821_CONF2_LTOIE 0x10
97 #define AMC6821_CONF2_RTOIE 0x20
98 #define AMC6821_CONF2_PSVIE 0x40
99 #define AMC6821_CONF2_RST 0x80
100
101 #define AMC6821_CONF3_THERM_FAN_EN 0x80
102 #define AMC6821_CONF3_REV_MASK 0x0F
103
104 #define AMC6821_CONF4_OVREN 0x10
105 #define AMC6821_CONF4_TACH_FAST 0x20
106 #define AMC6821_CONF4_PSPR 0x40
107 #define AMC6821_CONF4_MODE 0x80
108
109 #define AMC6821_STAT1_RPM_ALARM 0x01
110 #define AMC6821_STAT1_FANS 0x02
111 #define AMC6821_STAT1_RTH 0x04
112 #define AMC6821_STAT1_RTL 0x08
113 #define AMC6821_STAT1_R_THERM 0x10
114 #define AMC6821_STAT1_RTF 0x20
115 #define AMC6821_STAT1_LTH 0x40
116 #define AMC6821_STAT1_LTL 0x80
117
118 #define AMC6821_STAT2_RTC 0x08
119 #define AMC6821_STAT2_LTC 0x10
120 #define AMC6821_STAT2_LPSV 0x20
121 #define AMC6821_STAT2_L_THERM 0x40
122 #define AMC6821_STAT2_THERM_IN 0x80
123
124 enum {IDX_TEMP1_INPUT = 0, IDX_TEMP1_MIN, IDX_TEMP1_MAX,
125         IDX_TEMP1_CRIT, IDX_TEMP2_INPUT, IDX_TEMP2_MIN,
126         IDX_TEMP2_MAX, IDX_TEMP2_CRIT,
127         TEMP_IDX_LEN, };
128
129 static const u8 temp_reg[] = {AMC6821_REG_LTEMP_HI,
130                         AMC6821_REG_LTEMP_LIMIT_MIN,
131                         AMC6821_REG_LTEMP_LIMIT_MAX,
132                         AMC6821_REG_LTEMP_CRIT,
133                         AMC6821_REG_RTEMP_HI,
134                         AMC6821_REG_RTEMP_LIMIT_MIN,
135                         AMC6821_REG_RTEMP_LIMIT_MAX,
136                         AMC6821_REG_RTEMP_CRIT, };
137
138 enum {IDX_FAN1_INPUT = 0, IDX_FAN1_MIN, IDX_FAN1_MAX,
139         FAN1_IDX_LEN, };
140
141 static const u8 fan_reg_low[] = {AMC6821_REG_TDATA_LOW,
142                         AMC6821_REG_TACH_LLIMITL,
143                         AMC6821_REG_TACH_HLIMITL, };
144
145
146 static const u8 fan_reg_hi[] = {AMC6821_REG_TDATA_HI,
147                         AMC6821_REG_TACH_LLIMITH,
148                         AMC6821_REG_TACH_HLIMITH, };
149
150 /*
151  * Client data (each client gets its own)
152  */
153
154 struct amc6821_data {
155         struct i2c_client *client;
156         struct mutex update_lock;
157         char valid; /* zero until following fields are valid */
158         unsigned long last_updated; /* in jiffies */
159
160         /* register values */
161         int temp[TEMP_IDX_LEN];
162
163         u16 fan[FAN1_IDX_LEN];
164         u8 fan1_div;
165
166         u8 pwm1;
167         u8 temp1_auto_point_temp[3];
168         u8 temp2_auto_point_temp[3];
169         u8 pwm1_auto_point_pwm[3];
170         u8 pwm1_enable;
171         u8 pwm1_auto_channels_temp;
172
173         u8 stat1;
174         u8 stat2;
175 };
176
177 static struct amc6821_data *amc6821_update_device(struct device *dev)
178 {
179         struct amc6821_data *data = dev_get_drvdata(dev);
180         struct i2c_client *client = data->client;
181         int timeout = HZ;
182         u8 reg;
183         int i;
184
185         mutex_lock(&data->update_lock);
186
187         if (time_after(jiffies, data->last_updated + timeout) ||
188                         !data->valid) {
189
190                 for (i = 0; i < TEMP_IDX_LEN; i++)
191                         data->temp[i] = (int8_t)i2c_smbus_read_byte_data(
192                                 client, temp_reg[i]);
193
194                 data->stat1 = i2c_smbus_read_byte_data(client,
195                         AMC6821_REG_STAT1);
196                 data->stat2 = i2c_smbus_read_byte_data(client,
197                         AMC6821_REG_STAT2);
198
199                 data->pwm1 = i2c_smbus_read_byte_data(client,
200                         AMC6821_REG_DCY);
201                 for (i = 0; i < FAN1_IDX_LEN; i++) {
202                         data->fan[i] = i2c_smbus_read_byte_data(
203                                         client,
204                                         fan_reg_low[i]);
205                         data->fan[i] += i2c_smbus_read_byte_data(
206                                         client,
207                                         fan_reg_hi[i]) << 8;
208                 }
209                 data->fan1_div = i2c_smbus_read_byte_data(client,
210                         AMC6821_REG_CONF4);
211                 data->fan1_div = data->fan1_div & AMC6821_CONF4_PSPR ? 4 : 2;
212
213                 data->pwm1_auto_point_pwm[0] = 0;
214                 data->pwm1_auto_point_pwm[2] = 255;
215                 data->pwm1_auto_point_pwm[1] = i2c_smbus_read_byte_data(client,
216                         AMC6821_REG_DCY_LOW_TEMP);
217
218                 data->temp1_auto_point_temp[0] =
219                         i2c_smbus_read_byte_data(client,
220                                         AMC6821_REG_PSV_TEMP);
221                 data->temp2_auto_point_temp[0] =
222                                 data->temp1_auto_point_temp[0];
223                 reg = i2c_smbus_read_byte_data(client,
224                         AMC6821_REG_LTEMP_FAN_CTRL);
225                 data->temp1_auto_point_temp[1] = (reg & 0xF8) >> 1;
226                 reg &= 0x07;
227                 reg = 0x20 >> reg;
228                 if (reg > 0)
229                         data->temp1_auto_point_temp[2] =
230                                 data->temp1_auto_point_temp[1] +
231                                 (data->pwm1_auto_point_pwm[2] -
232                                 data->pwm1_auto_point_pwm[1]) / reg;
233                 else
234                         data->temp1_auto_point_temp[2] = 255;
235
236                 reg = i2c_smbus_read_byte_data(client,
237                         AMC6821_REG_RTEMP_FAN_CTRL);
238                 data->temp2_auto_point_temp[1] = (reg & 0xF8) >> 1;
239                 reg &= 0x07;
240                 reg = 0x20 >> reg;
241                 if (reg > 0)
242                         data->temp2_auto_point_temp[2] =
243                                 data->temp2_auto_point_temp[1] +
244                                 (data->pwm1_auto_point_pwm[2] -
245                                 data->pwm1_auto_point_pwm[1]) / reg;
246                 else
247                         data->temp2_auto_point_temp[2] = 255;
248
249                 reg = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
250                 reg = (reg >> 5) & 0x3;
251                 switch (reg) {
252                 case 0: /*open loop: software sets pwm1*/
253                         data->pwm1_auto_channels_temp = 0;
254                         data->pwm1_enable = 1;
255                         break;
256                 case 2: /*closed loop: remote T (temp2)*/
257                         data->pwm1_auto_channels_temp = 2;
258                         data->pwm1_enable = 2;
259                         break;
260                 case 3: /*closed loop: local and remote T (temp2)*/
261                         data->pwm1_auto_channels_temp = 3;
262                         data->pwm1_enable = 3;
263                         break;
264                 case 1: /*
265                          * semi-open loop: software sets rpm, chip controls
266                          * pwm1, currently not implemented
267                          */
268                         data->pwm1_auto_channels_temp = 0;
269                         data->pwm1_enable = 0;
270                         break;
271                 }
272
273                 data->last_updated = jiffies;
274                 data->valid = 1;
275         }
276         mutex_unlock(&data->update_lock);
277         return data;
278 }
279
280 static ssize_t get_temp(
281                 struct device *dev,
282                 struct device_attribute *devattr,
283                 char *buf)
284 {
285         struct amc6821_data *data = amc6821_update_device(dev);
286         int ix = to_sensor_dev_attr(devattr)->index;
287
288         return sprintf(buf, "%d\n", data->temp[ix] * 1000);
289 }
290
291 static ssize_t set_temp(
292                 struct device *dev,
293                 struct device_attribute *attr,
294                 const char *buf,
295                 size_t count)
296 {
297         struct amc6821_data *data = dev_get_drvdata(dev);
298         struct i2c_client *client = data->client;
299         int ix = to_sensor_dev_attr(attr)->index;
300         long val;
301
302         int ret = kstrtol(buf, 10, &val);
303         if (ret)
304                 return ret;
305         val = clamp_val(val / 1000, -128, 127);
306
307         mutex_lock(&data->update_lock);
308         data->temp[ix] = val;
309         if (i2c_smbus_write_byte_data(client, temp_reg[ix], data->temp[ix])) {
310                 dev_err(&client->dev, "Register write error, aborting.\n");
311                 count = -EIO;
312         }
313         mutex_unlock(&data->update_lock);
314         return count;
315 }
316
317 static ssize_t get_temp_alarm(
318         struct device *dev,
319         struct device_attribute *devattr,
320         char *buf)
321 {
322         struct amc6821_data *data = amc6821_update_device(dev);
323         int ix = to_sensor_dev_attr(devattr)->index;
324         u8 flag;
325
326         switch (ix) {
327         case IDX_TEMP1_MIN:
328                 flag = data->stat1 & AMC6821_STAT1_LTL;
329                 break;
330         case IDX_TEMP1_MAX:
331                 flag = data->stat1 & AMC6821_STAT1_LTH;
332                 break;
333         case IDX_TEMP1_CRIT:
334                 flag = data->stat2 & AMC6821_STAT2_LTC;
335                 break;
336         case IDX_TEMP2_MIN:
337                 flag = data->stat1 & AMC6821_STAT1_RTL;
338                 break;
339         case IDX_TEMP2_MAX:
340                 flag = data->stat1 & AMC6821_STAT1_RTH;
341                 break;
342         case IDX_TEMP2_CRIT:
343                 flag = data->stat2 & AMC6821_STAT2_RTC;
344                 break;
345         default:
346                 dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
347                 return -EINVAL;
348         }
349         if (flag)
350                 return sprintf(buf, "1");
351         else
352                 return sprintf(buf, "0");
353 }
354
355 static ssize_t get_temp2_fault(
356                 struct device *dev,
357                 struct device_attribute *devattr,
358                 char *buf)
359 {
360         struct amc6821_data *data = amc6821_update_device(dev);
361         if (data->stat1 & AMC6821_STAT1_RTF)
362                 return sprintf(buf, "1");
363         else
364                 return sprintf(buf, "0");
365 }
366
367 static ssize_t get_pwm1(
368                 struct device *dev,
369                 struct device_attribute *devattr,
370                 char *buf)
371 {
372         struct amc6821_data *data = amc6821_update_device(dev);
373         return sprintf(buf, "%d\n", data->pwm1);
374 }
375
376 static ssize_t set_pwm1(
377                 struct device *dev,
378                 struct device_attribute *devattr,
379                 const char *buf,
380                 size_t count)
381 {
382         struct amc6821_data *data = dev_get_drvdata(dev);
383         struct i2c_client *client = data->client;
384         long val;
385         int ret = kstrtol(buf, 10, &val);
386         if (ret)
387                 return ret;
388
389         mutex_lock(&data->update_lock);
390         data->pwm1 = clamp_val(val , 0, 255);
391         i2c_smbus_write_byte_data(client, AMC6821_REG_DCY, data->pwm1);
392         mutex_unlock(&data->update_lock);
393         return count;
394 }
395
396 static ssize_t get_pwm1_enable(
397                 struct device *dev,
398                 struct device_attribute *devattr,
399                 char *buf)
400 {
401         struct amc6821_data *data = amc6821_update_device(dev);
402         return sprintf(buf, "%d\n", data->pwm1_enable);
403 }
404
405 static ssize_t set_pwm1_enable(
406                 struct device *dev,
407                 struct device_attribute *attr,
408                 const char *buf,
409                 size_t count)
410 {
411         struct amc6821_data *data = dev_get_drvdata(dev);
412         struct i2c_client *client = data->client;
413         long val;
414         int config = kstrtol(buf, 10, &val);
415         if (config)
416                 return config;
417
418         mutex_lock(&data->update_lock);
419         config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
420         if (config < 0) {
421                         dev_err(&client->dev,
422                         "Error reading configuration register, aborting.\n");
423                         count = config;
424                         goto unlock;
425         }
426
427         switch (val) {
428         case 1:
429                 config &= ~AMC6821_CONF1_FDRC0;
430                 config &= ~AMC6821_CONF1_FDRC1;
431                 break;
432         case 2:
433                 config &= ~AMC6821_CONF1_FDRC0;
434                 config |= AMC6821_CONF1_FDRC1;
435                 break;
436         case 3:
437                 config |= AMC6821_CONF1_FDRC0;
438                 config |= AMC6821_CONF1_FDRC1;
439                 break;
440         default:
441                 count = -EINVAL;
442                 goto unlock;
443         }
444         if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF1, config)) {
445                         dev_err(&client->dev,
446                         "Configuration register write error, aborting.\n");
447                         count = -EIO;
448         }
449 unlock:
450         mutex_unlock(&data->update_lock);
451         return count;
452 }
453
454 static ssize_t get_pwm1_auto_channels_temp(
455                 struct device *dev,
456                 struct device_attribute *devattr,
457                 char *buf)
458 {
459         struct amc6821_data *data = amc6821_update_device(dev);
460         return sprintf(buf, "%d\n", data->pwm1_auto_channels_temp);
461 }
462
463 static ssize_t get_temp_auto_point_temp(
464                 struct device *dev,
465                 struct device_attribute *devattr,
466                 char *buf)
467 {
468         int ix = to_sensor_dev_attr_2(devattr)->index;
469         int nr = to_sensor_dev_attr_2(devattr)->nr;
470         struct amc6821_data *data = amc6821_update_device(dev);
471         switch (nr) {
472         case 1:
473                 return sprintf(buf, "%d\n",
474                         data->temp1_auto_point_temp[ix] * 1000);
475         case 2:
476                 return sprintf(buf, "%d\n",
477                         data->temp2_auto_point_temp[ix] * 1000);
478         default:
479                 dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
480                 return -EINVAL;
481         }
482 }
483
484 static ssize_t get_pwm1_auto_point_pwm(
485                 struct device *dev,
486                 struct device_attribute *devattr,
487                 char *buf)
488 {
489         int ix = to_sensor_dev_attr(devattr)->index;
490         struct amc6821_data *data = amc6821_update_device(dev);
491         return sprintf(buf, "%d\n", data->pwm1_auto_point_pwm[ix]);
492 }
493
494 static inline ssize_t set_slope_register(struct i2c_client *client,
495                 u8 reg,
496                 u8 dpwm,
497                 u8 *ptemp)
498 {
499         int dt;
500         u8 tmp;
501
502         dt = ptemp[2]-ptemp[1];
503         for (tmp = 4; tmp > 0; tmp--) {
504                 if (dt * (0x20 >> tmp) >= dpwm)
505                         break;
506         }
507         tmp |= (ptemp[1] & 0x7C) << 1;
508         if (i2c_smbus_write_byte_data(client,
509                         reg, tmp)) {
510                 dev_err(&client->dev, "Register write error, aborting.\n");
511                 return -EIO;
512         }
513         return 0;
514 }
515
516 static ssize_t set_temp_auto_point_temp(
517                 struct device *dev,
518                 struct device_attribute *attr,
519                 const char *buf,
520                 size_t count)
521 {
522         struct amc6821_data *data = amc6821_update_device(dev);
523         struct i2c_client *client = data->client;
524         int ix = to_sensor_dev_attr_2(attr)->index;
525         int nr = to_sensor_dev_attr_2(attr)->nr;
526         u8 *ptemp;
527         u8 reg;
528         int dpwm;
529         long val;
530         int ret = kstrtol(buf, 10, &val);
531         if (ret)
532                 return ret;
533
534         switch (nr) {
535         case 1:
536                 ptemp = data->temp1_auto_point_temp;
537                 reg = AMC6821_REG_LTEMP_FAN_CTRL;
538                 break;
539         case 2:
540                 ptemp = data->temp2_auto_point_temp;
541                 reg = AMC6821_REG_RTEMP_FAN_CTRL;
542                 break;
543         default:
544                 dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
545                 return -EINVAL;
546         }
547
548         mutex_lock(&data->update_lock);
549         data->valid = 0;
550
551         switch (ix) {
552         case 0:
553                 ptemp[0] = clamp_val(val / 1000, 0,
554                                      data->temp1_auto_point_temp[1]);
555                 ptemp[0] = clamp_val(ptemp[0], 0,
556                                      data->temp2_auto_point_temp[1]);
557                 ptemp[0] = clamp_val(ptemp[0], 0, 63);
558                 if (i2c_smbus_write_byte_data(
559                                         client,
560                                         AMC6821_REG_PSV_TEMP,
561                                         ptemp[0])) {
562                                 dev_err(&client->dev,
563                                         "Register write error, aborting.\n");
564                                 count = -EIO;
565                 }
566                 goto EXIT;
567         case 1:
568                 ptemp[1] = clamp_val(val / 1000, (ptemp[0] & 0x7C) + 4, 124);
569                 ptemp[1] &= 0x7C;
570                 ptemp[2] = clamp_val(ptemp[2], ptemp[1] + 1, 255);
571                 break;
572         case 2:
573                 ptemp[2] = clamp_val(val / 1000, ptemp[1]+1, 255);
574                 break;
575         default:
576                 dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
577                 count = -EINVAL;
578                 goto EXIT;
579         }
580         dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
581         if (set_slope_register(client, reg, dpwm, ptemp))
582                 count = -EIO;
583
584 EXIT:
585         mutex_unlock(&data->update_lock);
586         return count;
587 }
588
589 static ssize_t set_pwm1_auto_point_pwm(
590                 struct device *dev,
591                 struct device_attribute *attr,
592                 const char *buf,
593                 size_t count)
594 {
595         struct amc6821_data *data = dev_get_drvdata(dev);
596         struct i2c_client *client = data->client;
597         int dpwm;
598         long val;
599         int ret = kstrtol(buf, 10, &val);
600         if (ret)
601                 return ret;
602
603         mutex_lock(&data->update_lock);
604         data->pwm1_auto_point_pwm[1] = clamp_val(val, 0, 254);
605         if (i2c_smbus_write_byte_data(client, AMC6821_REG_DCY_LOW_TEMP,
606                         data->pwm1_auto_point_pwm[1])) {
607                 dev_err(&client->dev, "Register write error, aborting.\n");
608                 count = -EIO;
609                 goto EXIT;
610         }
611         dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
612         if (set_slope_register(client, AMC6821_REG_LTEMP_FAN_CTRL, dpwm,
613                         data->temp1_auto_point_temp)) {
614                 count = -EIO;
615                 goto EXIT;
616         }
617         if (set_slope_register(client, AMC6821_REG_RTEMP_FAN_CTRL, dpwm,
618                         data->temp2_auto_point_temp)) {
619                 count = -EIO;
620                 goto EXIT;
621         }
622
623 EXIT:
624         data->valid = 0;
625         mutex_unlock(&data->update_lock);
626         return count;
627 }
628
629 static ssize_t get_fan(
630                 struct device *dev,
631                 struct device_attribute *devattr,
632                 char *buf)
633 {
634         struct amc6821_data *data = amc6821_update_device(dev);
635         int ix = to_sensor_dev_attr(devattr)->index;
636         if (0 == data->fan[ix])
637                 return sprintf(buf, "0");
638         return sprintf(buf, "%d\n", (int)(6000000 / data->fan[ix]));
639 }
640
641 static ssize_t get_fan1_fault(
642                 struct device *dev,
643                 struct device_attribute *devattr,
644                 char *buf)
645 {
646         struct amc6821_data *data = amc6821_update_device(dev);
647         if (data->stat1 & AMC6821_STAT1_FANS)
648                 return sprintf(buf, "1");
649         else
650                 return sprintf(buf, "0");
651 }
652
653 static ssize_t set_fan(
654                 struct device *dev,
655                 struct device_attribute *attr,
656                 const char *buf, size_t count)
657 {
658         struct amc6821_data *data = dev_get_drvdata(dev);
659         struct i2c_client *client = data->client;
660         long val;
661         int ix = to_sensor_dev_attr(attr)->index;
662         int ret = kstrtol(buf, 10, &val);
663         if (ret)
664                 return ret;
665         val = 1 > val ? 0xFFFF : 6000000/val;
666
667         mutex_lock(&data->update_lock);
668         data->fan[ix] = (u16) clamp_val(val, 1, 0xFFFF);
669         if (i2c_smbus_write_byte_data(client, fan_reg_low[ix],
670                         data->fan[ix] & 0xFF)) {
671                 dev_err(&client->dev, "Register write error, aborting.\n");
672                 count = -EIO;
673                 goto EXIT;
674         }
675         if (i2c_smbus_write_byte_data(client,
676                         fan_reg_hi[ix], data->fan[ix] >> 8)) {
677                 dev_err(&client->dev, "Register write error, aborting.\n");
678                 count = -EIO;
679         }
680 EXIT:
681         mutex_unlock(&data->update_lock);
682         return count;
683 }
684
685 static ssize_t get_fan1_div(
686                 struct device *dev,
687                 struct device_attribute *devattr,
688                 char *buf)
689 {
690         struct amc6821_data *data = amc6821_update_device(dev);
691         return sprintf(buf, "%d\n", data->fan1_div);
692 }
693
694 static ssize_t set_fan1_div(
695                 struct device *dev,
696                 struct device_attribute *attr,
697                 const char *buf, size_t count)
698 {
699         struct amc6821_data *data = dev_get_drvdata(dev);
700         struct i2c_client *client = data->client;
701         long val;
702         int config = kstrtol(buf, 10, &val);
703         if (config)
704                 return config;
705
706         mutex_lock(&data->update_lock);
707         config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
708         if (config < 0) {
709                 dev_err(&client->dev,
710                         "Error reading configuration register, aborting.\n");
711                 count = config;
712                 goto EXIT;
713         }
714         switch (val) {
715         case 2:
716                 config &= ~AMC6821_CONF4_PSPR;
717                 data->fan1_div = 2;
718                 break;
719         case 4:
720                 config |= AMC6821_CONF4_PSPR;
721                 data->fan1_div = 4;
722                 break;
723         default:
724                 count = -EINVAL;
725                 goto EXIT;
726         }
727         if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4, config)) {
728                 dev_err(&client->dev,
729                         "Configuration register write error, aborting.\n");
730                 count = -EIO;
731         }
732 EXIT:
733         mutex_unlock(&data->update_lock);
734         return count;
735 }
736
737 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
738         get_temp, NULL, IDX_TEMP1_INPUT);
739 static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, get_temp,
740         set_temp, IDX_TEMP1_MIN);
741 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, get_temp,
742         set_temp, IDX_TEMP1_MAX);
743 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR, get_temp,
744         set_temp, IDX_TEMP1_CRIT);
745 static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO,
746         get_temp_alarm, NULL, IDX_TEMP1_MIN);
747 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO,
748         get_temp_alarm, NULL, IDX_TEMP1_MAX);
749 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO,
750         get_temp_alarm, NULL, IDX_TEMP1_CRIT);
751 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO,
752         get_temp, NULL, IDX_TEMP2_INPUT);
753 static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, get_temp,
754         set_temp, IDX_TEMP2_MIN);
755 static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, get_temp,
756         set_temp, IDX_TEMP2_MAX);
757 static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR, get_temp,
758         set_temp, IDX_TEMP2_CRIT);
759 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO,
760         get_temp2_fault, NULL, 0);
761 static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO,
762         get_temp_alarm, NULL, IDX_TEMP2_MIN);
763 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO,
764         get_temp_alarm, NULL, IDX_TEMP2_MAX);
765 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO,
766         get_temp_alarm, NULL, IDX_TEMP2_CRIT);
767 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, IDX_FAN1_INPUT);
768 static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO | S_IWUSR,
769         get_fan, set_fan, IDX_FAN1_MIN);
770 static SENSOR_DEVICE_ATTR(fan1_max, S_IRUGO | S_IWUSR,
771         get_fan, set_fan, IDX_FAN1_MAX);
772 static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan1_fault, NULL, 0);
773 static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
774         get_fan1_div, set_fan1_div, 0);
775
776 static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm1, set_pwm1, 0);
777 static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
778         get_pwm1_enable, set_pwm1_enable, 0);
779 static SENSOR_DEVICE_ATTR(pwm1_auto_point1_pwm, S_IRUGO,
780         get_pwm1_auto_point_pwm, NULL, 0);
781 static SENSOR_DEVICE_ATTR(pwm1_auto_point2_pwm, S_IWUSR | S_IRUGO,
782         get_pwm1_auto_point_pwm, set_pwm1_auto_point_pwm, 1);
783 static SENSOR_DEVICE_ATTR(pwm1_auto_point3_pwm, S_IRUGO,
784         get_pwm1_auto_point_pwm, NULL, 2);
785 static SENSOR_DEVICE_ATTR(pwm1_auto_channels_temp, S_IRUGO,
786         get_pwm1_auto_channels_temp, NULL, 0);
787 static SENSOR_DEVICE_ATTR_2(temp1_auto_point1_temp, S_IRUGO,
788         get_temp_auto_point_temp, NULL, 1, 0);
789 static SENSOR_DEVICE_ATTR_2(temp1_auto_point2_temp, S_IWUSR | S_IRUGO,
790         get_temp_auto_point_temp, set_temp_auto_point_temp, 1, 1);
791 static SENSOR_DEVICE_ATTR_2(temp1_auto_point3_temp, S_IWUSR | S_IRUGO,
792         get_temp_auto_point_temp, set_temp_auto_point_temp, 1, 2);
793
794 static SENSOR_DEVICE_ATTR_2(temp2_auto_point1_temp, S_IWUSR | S_IRUGO,
795         get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 0);
796 static SENSOR_DEVICE_ATTR_2(temp2_auto_point2_temp, S_IWUSR | S_IRUGO,
797         get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 1);
798 static SENSOR_DEVICE_ATTR_2(temp2_auto_point3_temp, S_IWUSR | S_IRUGO,
799         get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 2);
800
801 static struct attribute *amc6821_attrs[] = {
802         &sensor_dev_attr_temp1_input.dev_attr.attr,
803         &sensor_dev_attr_temp1_min.dev_attr.attr,
804         &sensor_dev_attr_temp1_max.dev_attr.attr,
805         &sensor_dev_attr_temp1_crit.dev_attr.attr,
806         &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
807         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
808         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
809         &sensor_dev_attr_temp2_input.dev_attr.attr,
810         &sensor_dev_attr_temp2_min.dev_attr.attr,
811         &sensor_dev_attr_temp2_max.dev_attr.attr,
812         &sensor_dev_attr_temp2_crit.dev_attr.attr,
813         &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
814         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
815         &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
816         &sensor_dev_attr_temp2_fault.dev_attr.attr,
817         &sensor_dev_attr_fan1_input.dev_attr.attr,
818         &sensor_dev_attr_fan1_min.dev_attr.attr,
819         &sensor_dev_attr_fan1_max.dev_attr.attr,
820         &sensor_dev_attr_fan1_fault.dev_attr.attr,
821         &sensor_dev_attr_fan1_div.dev_attr.attr,
822         &sensor_dev_attr_pwm1.dev_attr.attr,
823         &sensor_dev_attr_pwm1_enable.dev_attr.attr,
824         &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,
825         &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
826         &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
827         &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
828         &sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr,
829         &sensor_dev_attr_temp1_auto_point2_temp.dev_attr.attr,
830         &sensor_dev_attr_temp1_auto_point3_temp.dev_attr.attr,
831         &sensor_dev_attr_temp2_auto_point1_temp.dev_attr.attr,
832         &sensor_dev_attr_temp2_auto_point2_temp.dev_attr.attr,
833         &sensor_dev_attr_temp2_auto_point3_temp.dev_attr.attr,
834         NULL
835 };
836
837 ATTRIBUTE_GROUPS(amc6821);
838
839 /* Return 0 if detection is successful, -ENODEV otherwise */
840 static int amc6821_detect(
841                 struct i2c_client *client,
842                 struct i2c_board_info *info)
843 {
844         struct i2c_adapter *adapter = client->adapter;
845         int address = client->addr;
846         int dev_id, comp_id;
847
848         dev_dbg(&adapter->dev, "amc6821_detect called.\n");
849
850         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
851                 dev_dbg(&adapter->dev,
852                         "amc6821: I2C bus doesn't support byte mode, "
853                         "skipping.\n");
854                 return -ENODEV;
855         }
856
857         dev_id = i2c_smbus_read_byte_data(client, AMC6821_REG_DEV_ID);
858         comp_id = i2c_smbus_read_byte_data(client, AMC6821_REG_COMP_ID);
859         if (dev_id != 0x21 || comp_id != 0x49) {
860                 dev_dbg(&adapter->dev,
861                         "amc6821: detection failed at 0x%02x.\n",
862                         address);
863                 return -ENODEV;
864         }
865
866         /*
867          * Bit 7 of the address register is ignored, so we can check the
868          * ID registers again
869          */
870         dev_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_DEV_ID);
871         comp_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_COMP_ID);
872         if (dev_id != 0x21 || comp_id != 0x49) {
873                 dev_dbg(&adapter->dev,
874                         "amc6821: detection failed at 0x%02x.\n",
875                         address);
876                 return -ENODEV;
877         }
878
879         dev_info(&adapter->dev, "amc6821: chip found at 0x%02x.\n", address);
880         strlcpy(info->type, "amc6821", I2C_NAME_SIZE);
881
882         return 0;
883 }
884
885 static int amc6821_init_client(struct i2c_client *client)
886 {
887         int config;
888         int err = -EIO;
889
890         if (init) {
891                 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
892
893                 if (config < 0) {
894                                 dev_err(&client->dev,
895                         "Error reading configuration register, aborting.\n");
896                                 return err;
897                 }
898
899                 config |= AMC6821_CONF4_MODE;
900
901                 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4,
902                                 config)) {
903                         dev_err(&client->dev,
904                         "Configuration register write error, aborting.\n");
905                         return err;
906                 }
907
908                 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF3);
909
910                 if (config < 0) {
911                         dev_err(&client->dev,
912                         "Error reading configuration register, aborting.\n");
913                         return err;
914                 }
915
916                 dev_info(&client->dev, "Revision %d\n", config & 0x0f);
917
918                 config &= ~AMC6821_CONF3_THERM_FAN_EN;
919
920                 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF3,
921                                 config)) {
922                         dev_err(&client->dev,
923                         "Configuration register write error, aborting.\n");
924                         return err;
925                 }
926
927                 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF2);
928
929                 if (config < 0) {
930                         dev_err(&client->dev,
931                         "Error reading configuration register, aborting.\n");
932                         return err;
933                 }
934
935                 config &= ~AMC6821_CONF2_RTFIE;
936                 config &= ~AMC6821_CONF2_LTOIE;
937                 config &= ~AMC6821_CONF2_RTOIE;
938                 if (i2c_smbus_write_byte_data(client,
939                                 AMC6821_REG_CONF2, config)) {
940                         dev_err(&client->dev,
941                         "Configuration register write error, aborting.\n");
942                         return err;
943                 }
944
945                 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
946
947                 if (config < 0) {
948                         dev_err(&client->dev,
949                         "Error reading configuration register, aborting.\n");
950                         return err;
951                 }
952
953                 config &= ~AMC6821_CONF1_THERMOVIE;
954                 config &= ~AMC6821_CONF1_FANIE;
955                 config |= AMC6821_CONF1_START;
956                 if (pwminv)
957                         config |= AMC6821_CONF1_PWMINV;
958                 else
959                         config &= ~AMC6821_CONF1_PWMINV;
960
961                 if (i2c_smbus_write_byte_data(
962                                 client, AMC6821_REG_CONF1, config)) {
963                         dev_err(&client->dev,
964                         "Configuration register write error, aborting.\n");
965                         return err;
966                 }
967         }
968         return 0;
969 }
970
971 static int amc6821_probe(struct i2c_client *client,
972                          const struct i2c_device_id *id)
973 {
974         struct device *dev = &client->dev;
975         struct amc6821_data *data;
976         struct device *hwmon_dev;
977         int err;
978
979         data = devm_kzalloc(dev, sizeof(struct amc6821_data), GFP_KERNEL);
980         if (!data)
981                 return -ENOMEM;
982
983         data->client = client;
984         mutex_init(&data->update_lock);
985
986         /*
987          * Initialize the amc6821 chip
988          */
989         err = amc6821_init_client(client);
990         if (err)
991                 return err;
992
993         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
994                                                            data,
995                                                            amc6821_groups);
996         return PTR_ERR_OR_ZERO(hwmon_dev);
997 }
998
999 static const struct i2c_device_id amc6821_id[] = {
1000         { "amc6821", amc6821 },
1001         { }
1002 };
1003
1004 MODULE_DEVICE_TABLE(i2c, amc6821_id);
1005
1006 static struct i2c_driver amc6821_driver = {
1007         .class = I2C_CLASS_HWMON,
1008         .driver = {
1009                 .name   = "amc6821",
1010         },
1011         .probe = amc6821_probe,
1012         .id_table = amc6821_id,
1013         .detect = amc6821_detect,
1014         .address_list = normal_i2c,
1015 };
1016
1017 module_i2c_driver(amc6821_driver);
1018
1019 MODULE_LICENSE("GPL");
1020 MODULE_AUTHOR("T. Mertelj <tomaz.mertelj@guest.arnes.si>");
1021 MODULE_DESCRIPTION("Texas Instruments amc6821 hwmon driver");