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gl518sm.c
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1 /*
2  * gl518sm.c - Part of lm_sensors, Linux kernel modules for hardware
3  * monitoring
4  * Copyright (C) 1998, 1999 Frodo Looijaard <[email protected]> and
5  * Kyosti Malkki <[email protected]>
6  * Copyright (C) 2004 Hong-Gunn Chew <[email protected]> and
7  * Jean Delvare <[email protected]>
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  * Ported to Linux 2.6 by Hong-Gunn Chew with the help of Jean Delvare
24  * and advice of Greg Kroah-Hartman.
25  *
26  * Notes about the port:
27  * Release 0x00 of the GL518SM chipset doesn't support reading of in0,
28  * in1 nor in2. The original driver had an ugly workaround to get them
29  * anyway (changing limits and watching alarms trigger and wear off).
30  * We did not keep that part of the original driver in the Linux 2.6
31  * version, since it was making the driver significantly more complex
32  * with no real benefit.
33  */
34 
35 #include <linux/module.h>
36 #include <linux/init.h>
37 #include <linux/slab.h>
38 #include <linux/jiffies.h>
39 #include <linux/i2c.h>
40 #include <linux/hwmon.h>
41 #include <linux/hwmon-sysfs.h>
42 #include <linux/err.h>
43 #include <linux/mutex.h>
44 #include <linux/sysfs.h>
45 
46 /* Addresses to scan */
47 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };
48 
49 enum chips { gl518sm_r00, gl518sm_r80 };
50 
51 /* Many GL518 constants specified below */
52 
53 /* The GL518 registers */
54 #define GL518_REG_CHIP_ID 0x00
55 #define GL518_REG_REVISION 0x01
56 #define GL518_REG_VENDOR_ID 0x02
57 #define GL518_REG_CONF 0x03
58 #define GL518_REG_TEMP_IN 0x04
59 #define GL518_REG_TEMP_MAX 0x05
60 #define GL518_REG_TEMP_HYST 0x06
61 #define GL518_REG_FAN_COUNT 0x07
62 #define GL518_REG_FAN_LIMIT 0x08
63 #define GL518_REG_VIN1_LIMIT 0x09
64 #define GL518_REG_VIN2_LIMIT 0x0a
65 #define GL518_REG_VIN3_LIMIT 0x0b
66 #define GL518_REG_VDD_LIMIT 0x0c
67 #define GL518_REG_VIN3 0x0d
68 #define GL518_REG_MISC 0x0f
69 #define GL518_REG_ALARM 0x10
70 #define GL518_REG_MASK 0x11
71 #define GL518_REG_INT 0x12
72 #define GL518_REG_VIN2 0x13
73 #define GL518_REG_VIN1 0x14
74 #define GL518_REG_VDD 0x15
75 
76 
77 /*
78  * Conversions. Rounding and limit checking is only done on the TO_REG
79  * variants. Note that you should be a bit careful with which arguments
80  * these macros are called: arguments may be evaluated more than once.
81  * Fixing this is just not worth it.
82  */
83 
84 #define RAW_FROM_REG(val) val
85 
86 #define BOOL_FROM_REG(val) ((val) ? 0 : 1)
87 #define BOOL_TO_REG(val) ((val) ? 0 : 1)
88 
89 #define TEMP_TO_REG(val) SENSORS_LIMIT(((((val) < 0 ? \
90  (val) - 500 : \
91  (val) + 500) / 1000) + 119), 0, 255)
92 #define TEMP_FROM_REG(val) (((val) - 119) * 1000)
93 
94 static inline u8 FAN_TO_REG(long rpm, int div)
95 {
96  long rpmdiv;
97  if (rpm == 0)
98  return 0;
99  rpmdiv = SENSORS_LIMIT(rpm, 1, 960000) * div;
100  return SENSORS_LIMIT((480000 + rpmdiv / 2) / rpmdiv, 1, 255);
101 }
102 #define FAN_FROM_REG(val, div) ((val) == 0 ? 0 : (480000 / ((val) * (div))))
103 
104 #define IN_TO_REG(val) SENSORS_LIMIT((((val) + 9) / 19), 0, 255)
105 #define IN_FROM_REG(val) ((val) * 19)
106 
107 #define VDD_TO_REG(val) SENSORS_LIMIT((((val) * 4 + 47) / 95), 0, 255)
108 #define VDD_FROM_REG(val) (((val) * 95 + 2) / 4)
109 
110 #define DIV_FROM_REG(val) (1 << (val))
111 
112 #define BEEP_MASK_TO_REG(val) ((val) & 0x7f & data->alarm_mask)
113 #define BEEP_MASK_FROM_REG(val) ((val) & 0x7f)
114 
115 /* Each client has this additional data */
116 struct gl518_data {
117  struct device *hwmon_dev;
118  enum chips type;
119 
120  struct mutex update_lock;
121  char valid; /* !=0 if following fields are valid */
122  unsigned long last_updated; /* In jiffies */
123 
124  u8 voltage_in[4]; /* Register values; [0] = VDD */
125  u8 voltage_min[4]; /* Register values; [0] = VDD */
126  u8 voltage_max[4]; /* Register values; [0] = VDD */
127  u8 fan_in[2];
128  u8 fan_min[2];
129  u8 fan_div[2]; /* Register encoding, shifted right */
130  u8 fan_auto1; /* Boolean */
131  u8 temp_in; /* Register values */
132  u8 temp_max; /* Register values */
133  u8 temp_hyst; /* Register values */
134  u8 alarms; /* Register value */
135  u8 alarm_mask;
136  u8 beep_mask; /* Register value */
137  u8 beep_enable; /* Boolean */
138 };
139 
140 static int gl518_probe(struct i2c_client *client,
141  const struct i2c_device_id *id);
142 static int gl518_detect(struct i2c_client *client, struct i2c_board_info *info);
143 static void gl518_init_client(struct i2c_client *client);
144 static int gl518_remove(struct i2c_client *client);
145 static int gl518_read_value(struct i2c_client *client, u8 reg);
146 static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value);
147 static struct gl518_data *gl518_update_device(struct device *dev);
148 
149 static const struct i2c_device_id gl518_id[] = {
150  { "gl518sm", 0 },
151  { }
152 };
153 MODULE_DEVICE_TABLE(i2c, gl518_id);
154 
155 /* This is the driver that will be inserted */
156 static struct i2c_driver gl518_driver = {
157  .class = I2C_CLASS_HWMON,
158  .driver = {
159  .name = "gl518sm",
160  },
161  .probe = gl518_probe,
162  .remove = gl518_remove,
163  .id_table = gl518_id,
164  .detect = gl518_detect,
165  .address_list = normal_i2c,
166 };
167 
168 /*
169  * Sysfs stuff
170  */
171 
172 #define show(type, suffix, value) \
173 static ssize_t show_##suffix(struct device *dev, \
174  struct device_attribute *attr, char *buf) \
175 { \
176  struct gl518_data *data = gl518_update_device(dev); \
177  return sprintf(buf, "%d\n", type##_FROM_REG(data->value)); \
178 }
179 
180 show(TEMP, temp_input1, temp_in);
181 show(TEMP, temp_max1, temp_max);
182 show(TEMP, temp_hyst1, temp_hyst);
183 show(BOOL, fan_auto1, fan_auto1);
184 show(VDD, in_input0, voltage_in[0]);
185 show(IN, in_input1, voltage_in[1]);
186 show(IN, in_input2, voltage_in[2]);
187 show(IN, in_input3, voltage_in[3]);
188 show(VDD, in_min0, voltage_min[0]);
189 show(IN, in_min1, voltage_min[1]);
190 show(IN, in_min2, voltage_min[2]);
191 show(IN, in_min3, voltage_min[3]);
192 show(VDD, in_max0, voltage_max[0]);
193 show(IN, in_max1, voltage_max[1]);
194 show(IN, in_max2, voltage_max[2]);
195 show(IN, in_max3, voltage_max[3]);
196 show(RAW, alarms, alarms);
197 show(BOOL, beep_enable, beep_enable);
198 show(BEEP_MASK, beep_mask, beep_mask);
199 
200 static ssize_t show_fan_input(struct device *dev,
201  struct device_attribute *attr, char *buf)
202 {
203  int nr = to_sensor_dev_attr(attr)->index;
204  struct gl518_data *data = gl518_update_device(dev);
205  return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_in[nr],
206  DIV_FROM_REG(data->fan_div[nr])));
207 }
208 
209 static ssize_t show_fan_min(struct device *dev,
210  struct device_attribute *attr, char *buf)
211 {
212  int nr = to_sensor_dev_attr(attr)->index;
213  struct gl518_data *data = gl518_update_device(dev);
214  return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
215  DIV_FROM_REG(data->fan_div[nr])));
216 }
217 
218 static ssize_t show_fan_div(struct device *dev,
219  struct device_attribute *attr, char *buf)
220 {
221  int nr = to_sensor_dev_attr(attr)->index;
222  struct gl518_data *data = gl518_update_device(dev);
223  return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
224 }
225 
226 #define set(type, suffix, value, reg) \
227 static ssize_t set_##suffix(struct device *dev, \
228  struct device_attribute *attr, \
229  const char *buf, size_t count) \
230 { \
231  struct i2c_client *client = to_i2c_client(dev); \
232  struct gl518_data *data = i2c_get_clientdata(client); \
233  long val; \
234  int err = kstrtol(buf, 10, &val); \
235  if (err) \
236  return err; \
237  \
238  mutex_lock(&data->update_lock); \
239  data->value = type##_TO_REG(val); \
240  gl518_write_value(client, reg, data->value); \
241  mutex_unlock(&data->update_lock); \
242  return count; \
243 }
244 
245 #define set_bits(type, suffix, value, reg, mask, shift) \
246 static ssize_t set_##suffix(struct device *dev, \
247  struct device_attribute *attr, \
248  const char *buf, size_t count) \
249 { \
250  struct i2c_client *client = to_i2c_client(dev); \
251  struct gl518_data *data = i2c_get_clientdata(client); \
252  int regvalue; \
253  unsigned long val; \
254  int err = kstrtoul(buf, 10, &val); \
255  if (err) \
256  return err; \
257  \
258  mutex_lock(&data->update_lock); \
259  regvalue = gl518_read_value(client, reg); \
260  data->value = type##_TO_REG(val); \
261  regvalue = (regvalue & ~mask) | (data->value << shift); \
262  gl518_write_value(client, reg, regvalue); \
263  mutex_unlock(&data->update_lock); \
264  return count; \
265 }
266 
267 #define set_low(type, suffix, value, reg) \
268  set_bits(type, suffix, value, reg, 0x00ff, 0)
269 #define set_high(type, suffix, value, reg) \
270  set_bits(type, suffix, value, reg, 0xff00, 8)
271 
272 set(TEMP, temp_max1, temp_max, GL518_REG_TEMP_MAX);
273 set(TEMP, temp_hyst1, temp_hyst, GL518_REG_TEMP_HYST);
274 set_bits(BOOL, fan_auto1, fan_auto1, GL518_REG_MISC, 0x08, 3);
275 set_low(VDD, in_min0, voltage_min[0], GL518_REG_VDD_LIMIT);
276 set_low(IN, in_min1, voltage_min[1], GL518_REG_VIN1_LIMIT);
277 set_low(IN, in_min2, voltage_min[2], GL518_REG_VIN2_LIMIT);
278 set_low(IN, in_min3, voltage_min[3], GL518_REG_VIN3_LIMIT);
279 set_high(VDD, in_max0, voltage_max[0], GL518_REG_VDD_LIMIT);
280 set_high(IN, in_max1, voltage_max[1], GL518_REG_VIN1_LIMIT);
281 set_high(IN, in_max2, voltage_max[2], GL518_REG_VIN2_LIMIT);
282 set_high(IN, in_max3, voltage_max[3], GL518_REG_VIN3_LIMIT);
283 set_bits(BOOL, beep_enable, beep_enable, GL518_REG_CONF, 0x04, 2);
284 set(BEEP_MASK, beep_mask, beep_mask, GL518_REG_ALARM);
285 
286 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
287  const char *buf, size_t count)
288 {
289  struct i2c_client *client = to_i2c_client(dev);
290  struct gl518_data *data = i2c_get_clientdata(client);
291  int nr = to_sensor_dev_attr(attr)->index;
292  int regvalue;
293  unsigned long val;
294  int err;
295 
296  err = kstrtoul(buf, 10, &val);
297  if (err)
298  return err;
299 
300  mutex_lock(&data->update_lock);
301  regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
302  data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
303  regvalue = (regvalue & (0xff << (8 * nr)))
304  | (data->fan_min[nr] << (8 * (1 - nr)));
305  gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);
306 
307  data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
308  if (data->fan_min[nr] == 0)
309  data->alarm_mask &= ~(0x20 << nr);
310  else
311  data->alarm_mask |= (0x20 << nr);
312  data->beep_mask &= data->alarm_mask;
313  gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
314 
315  mutex_unlock(&data->update_lock);
316  return count;
317 }
318 
319 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
320  const char *buf, size_t count)
321 {
322  struct i2c_client *client = to_i2c_client(dev);
323  struct gl518_data *data = i2c_get_clientdata(client);
324  int nr = to_sensor_dev_attr(attr)->index;
325  int regvalue;
326  unsigned long val;
327  int err;
328 
329  err = kstrtoul(buf, 10, &val);
330  if (err)
331  return err;
332 
333  switch (val) {
334  case 1:
335  val = 0;
336  break;
337  case 2:
338  val = 1;
339  break;
340  case 4:
341  val = 2;
342  break;
343  case 8:
344  val = 3;
345  break;
346  default:
347  dev_err(dev, "Invalid fan clock divider %lu, choose one "
348  "of 1, 2, 4 or 8\n", val);
349  return -EINVAL;
350  }
351 
352  mutex_lock(&data->update_lock);
353  regvalue = gl518_read_value(client, GL518_REG_MISC);
354  data->fan_div[nr] = val;
355  regvalue = (regvalue & ~(0xc0 >> (2 * nr)))
356  | (data->fan_div[nr] << (6 - 2 * nr));
357  gl518_write_value(client, GL518_REG_MISC, regvalue);
358  mutex_unlock(&data->update_lock);
359  return count;
360 }
361 
362 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
363 static DEVICE_ATTR(temp1_max, S_IWUSR|S_IRUGO, show_temp_max1, set_temp_max1);
364 static DEVICE_ATTR(temp1_max_hyst, S_IWUSR|S_IRUGO,
365  show_temp_hyst1, set_temp_hyst1);
366 static DEVICE_ATTR(fan1_auto, S_IWUSR|S_IRUGO, show_fan_auto1, set_fan_auto1);
367 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
368 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
369 static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR|S_IRUGO,
370  show_fan_min, set_fan_min, 0);
371 static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR|S_IRUGO,
372  show_fan_min, set_fan_min, 1);
373 static SENSOR_DEVICE_ATTR(fan1_div, S_IWUSR|S_IRUGO,
374  show_fan_div, set_fan_div, 0);
375 static SENSOR_DEVICE_ATTR(fan2_div, S_IWUSR|S_IRUGO,
376  show_fan_div, set_fan_div, 1);
377 static DEVICE_ATTR(in0_input, S_IRUGO, show_in_input0, NULL);
378 static DEVICE_ATTR(in1_input, S_IRUGO, show_in_input1, NULL);
379 static DEVICE_ATTR(in2_input, S_IRUGO, show_in_input2, NULL);
380 static DEVICE_ATTR(in3_input, S_IRUGO, show_in_input3, NULL);
381 static DEVICE_ATTR(in0_min, S_IWUSR|S_IRUGO, show_in_min0, set_in_min0);
382 static DEVICE_ATTR(in1_min, S_IWUSR|S_IRUGO, show_in_min1, set_in_min1);
383 static DEVICE_ATTR(in2_min, S_IWUSR|S_IRUGO, show_in_min2, set_in_min2);
384 static DEVICE_ATTR(in3_min, S_IWUSR|S_IRUGO, show_in_min3, set_in_min3);
385 static DEVICE_ATTR(in0_max, S_IWUSR|S_IRUGO, show_in_max0, set_in_max0);
386 static DEVICE_ATTR(in1_max, S_IWUSR|S_IRUGO, show_in_max1, set_in_max1);
387 static DEVICE_ATTR(in2_max, S_IWUSR|S_IRUGO, show_in_max2, set_in_max2);
388 static DEVICE_ATTR(in3_max, S_IWUSR|S_IRUGO, show_in_max3, set_in_max3);
389 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
390 static DEVICE_ATTR(beep_enable, S_IWUSR|S_IRUGO,
391  show_beep_enable, set_beep_enable);
392 static DEVICE_ATTR(beep_mask, S_IWUSR|S_IRUGO,
393  show_beep_mask, set_beep_mask);
394 
395 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
396  char *buf)
397 {
398  int bitnr = to_sensor_dev_attr(attr)->index;
399  struct gl518_data *data = gl518_update_device(dev);
400  return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
401 }
402 
403 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
404 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
405 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
406 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
407 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
408 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 5);
409 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 6);
410 
411 static ssize_t show_beep(struct device *dev, struct device_attribute *attr,
412  char *buf)
413 {
414  int bitnr = to_sensor_dev_attr(attr)->index;
415  struct gl518_data *data = gl518_update_device(dev);
416  return sprintf(buf, "%u\n", (data->beep_mask >> bitnr) & 1);
417 }
418 
419 static ssize_t set_beep(struct device *dev, struct device_attribute *attr,
420  const char *buf, size_t count)
421 {
422  struct i2c_client *client = to_i2c_client(dev);
423  struct gl518_data *data = i2c_get_clientdata(client);
424  int bitnr = to_sensor_dev_attr(attr)->index;
425  unsigned long bit;
426  int err;
427 
428  err = kstrtoul(buf, 10, &bit);
429  if (err)
430  return err;
431 
432  if (bit & ~1)
433  return -EINVAL;
434 
435  mutex_lock(&data->update_lock);
436  data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
437  if (bit)
438  data->beep_mask |= (1 << bitnr);
439  else
440  data->beep_mask &= ~(1 << bitnr);
441  gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
442  mutex_unlock(&data->update_lock);
443  return count;
444 }
445 
446 static SENSOR_DEVICE_ATTR(in0_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 0);
447 static SENSOR_DEVICE_ATTR(in1_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 1);
448 static SENSOR_DEVICE_ATTR(in2_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 2);
449 static SENSOR_DEVICE_ATTR(in3_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 3);
450 static SENSOR_DEVICE_ATTR(temp1_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 4);
451 static SENSOR_DEVICE_ATTR(fan1_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 5);
452 static SENSOR_DEVICE_ATTR(fan2_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 6);
453 
454 static struct attribute *gl518_attributes[] = {
455  &dev_attr_in3_input.attr,
456  &dev_attr_in0_min.attr,
457  &dev_attr_in1_min.attr,
458  &dev_attr_in2_min.attr,
459  &dev_attr_in3_min.attr,
460  &dev_attr_in0_max.attr,
461  &dev_attr_in1_max.attr,
462  &dev_attr_in2_max.attr,
463  &dev_attr_in3_max.attr,
464  &sensor_dev_attr_in0_alarm.dev_attr.attr,
465  &sensor_dev_attr_in1_alarm.dev_attr.attr,
466  &sensor_dev_attr_in2_alarm.dev_attr.attr,
467  &sensor_dev_attr_in3_alarm.dev_attr.attr,
468  &sensor_dev_attr_in0_beep.dev_attr.attr,
469  &sensor_dev_attr_in1_beep.dev_attr.attr,
470  &sensor_dev_attr_in2_beep.dev_attr.attr,
471  &sensor_dev_attr_in3_beep.dev_attr.attr,
472 
473  &dev_attr_fan1_auto.attr,
474  &sensor_dev_attr_fan1_input.dev_attr.attr,
475  &sensor_dev_attr_fan2_input.dev_attr.attr,
476  &sensor_dev_attr_fan1_min.dev_attr.attr,
477  &sensor_dev_attr_fan2_min.dev_attr.attr,
478  &sensor_dev_attr_fan1_div.dev_attr.attr,
479  &sensor_dev_attr_fan2_div.dev_attr.attr,
480  &sensor_dev_attr_fan1_alarm.dev_attr.attr,
481  &sensor_dev_attr_fan2_alarm.dev_attr.attr,
482  &sensor_dev_attr_fan1_beep.dev_attr.attr,
483  &sensor_dev_attr_fan2_beep.dev_attr.attr,
484 
485  &dev_attr_temp1_input.attr,
486  &dev_attr_temp1_max.attr,
487  &dev_attr_temp1_max_hyst.attr,
488  &sensor_dev_attr_temp1_alarm.dev_attr.attr,
489  &sensor_dev_attr_temp1_beep.dev_attr.attr,
490 
491  &dev_attr_alarms.attr,
492  &dev_attr_beep_enable.attr,
493  &dev_attr_beep_mask.attr,
494  NULL
495 };
496 
497 static const struct attribute_group gl518_group = {
498  .attrs = gl518_attributes,
499 };
500 
501 static struct attribute *gl518_attributes_r80[] = {
502  &dev_attr_in0_input.attr,
503  &dev_attr_in1_input.attr,
504  &dev_attr_in2_input.attr,
505  NULL
506 };
507 
508 static const struct attribute_group gl518_group_r80 = {
509  .attrs = gl518_attributes_r80,
510 };
511 
512 /*
513  * Real code
514  */
515 
516 /* Return 0 if detection is successful, -ENODEV otherwise */
517 static int gl518_detect(struct i2c_client *client, struct i2c_board_info *info)
518 {
519  struct i2c_adapter *adapter = client->adapter;
520  int rev;
521 
522  if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
523  I2C_FUNC_SMBUS_WORD_DATA))
524  return -ENODEV;
525 
526  /* Now, we do the remaining detection. */
527  if ((gl518_read_value(client, GL518_REG_CHIP_ID) != 0x80)
528  || (gl518_read_value(client, GL518_REG_CONF) & 0x80))
529  return -ENODEV;
530 
531  /* Determine the chip type. */
532  rev = gl518_read_value(client, GL518_REG_REVISION);
533  if (rev != 0x00 && rev != 0x80)
534  return -ENODEV;
535 
536  strlcpy(info->type, "gl518sm", I2C_NAME_SIZE);
537 
538  return 0;
539 }
540 
541 static int gl518_probe(struct i2c_client *client,
542  const struct i2c_device_id *id)
543 {
544  struct gl518_data *data;
545  int err, revision;
546 
547  data = devm_kzalloc(&client->dev, sizeof(struct gl518_data),
548  GFP_KERNEL);
549  if (!data)
550  return -ENOMEM;
551 
552  i2c_set_clientdata(client, data);
553  revision = gl518_read_value(client, GL518_REG_REVISION);
554  data->type = revision == 0x80 ? gl518sm_r80 : gl518sm_r00;
555  mutex_init(&data->update_lock);
556 
557  /* Initialize the GL518SM chip */
558  data->alarm_mask = 0xff;
559  gl518_init_client(client);
560 
561  /* Register sysfs hooks */
562  err = sysfs_create_group(&client->dev.kobj, &gl518_group);
563  if (err)
564  return err;
565  if (data->type == gl518sm_r80) {
566  err = sysfs_create_group(&client->dev.kobj, &gl518_group_r80);
567  if (err)
568  goto exit_remove_files;
569  }
570 
571  data->hwmon_dev = hwmon_device_register(&client->dev);
572  if (IS_ERR(data->hwmon_dev)) {
573  err = PTR_ERR(data->hwmon_dev);
574  goto exit_remove_files;
575  }
576 
577  return 0;
578 
579 exit_remove_files:
580  sysfs_remove_group(&client->dev.kobj, &gl518_group);
581  if (data->type == gl518sm_r80)
582  sysfs_remove_group(&client->dev.kobj, &gl518_group_r80);
583  return err;
584 }
585 
586 
587 /*
588  * Called when we have found a new GL518SM.
589  * Note that we preserve D4:NoFan2 and D2:beep_enable.
590  */
591 static void gl518_init_client(struct i2c_client *client)
592 {
593  /* Make sure we leave D7:Reset untouched */
594  u8 regvalue = gl518_read_value(client, GL518_REG_CONF) & 0x7f;
595 
596  /* Comparator mode (D3=0), standby mode (D6=0) */
597  gl518_write_value(client, GL518_REG_CONF, (regvalue &= 0x37));
598 
599  /* Never interrupts */
600  gl518_write_value(client, GL518_REG_MASK, 0x00);
601 
602  /* Clear status register (D5=1), start (D6=1) */
603  gl518_write_value(client, GL518_REG_CONF, 0x20 | regvalue);
604  gl518_write_value(client, GL518_REG_CONF, 0x40 | regvalue);
605 }
606 
607 static int gl518_remove(struct i2c_client *client)
608 {
609  struct gl518_data *data = i2c_get_clientdata(client);
610 
611  hwmon_device_unregister(data->hwmon_dev);
612  sysfs_remove_group(&client->dev.kobj, &gl518_group);
613  if (data->type == gl518sm_r80)
614  sysfs_remove_group(&client->dev.kobj, &gl518_group_r80);
615 
616  return 0;
617 }
618 
619 /*
620  * Registers 0x07 to 0x0c are word-sized, others are byte-sized
621  * GL518 uses a high-byte first convention, which is exactly opposite to
622  * the SMBus standard.
623  */
624 static int gl518_read_value(struct i2c_client *client, u8 reg)
625 {
626  if ((reg >= 0x07) && (reg <= 0x0c))
627  return i2c_smbus_read_word_swapped(client, reg);
628  else
629  return i2c_smbus_read_byte_data(client, reg);
630 }
631 
632 static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value)
633 {
634  if ((reg >= 0x07) && (reg <= 0x0c))
635  return i2c_smbus_write_word_swapped(client, reg, value);
636  else
637  return i2c_smbus_write_byte_data(client, reg, value);
638 }
639 
640 static struct gl518_data *gl518_update_device(struct device *dev)
641 {
642  struct i2c_client *client = to_i2c_client(dev);
643  struct gl518_data *data = i2c_get_clientdata(client);
644  int val;
645 
646  mutex_lock(&data->update_lock);
647 
648  if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
649  || !data->valid) {
650  dev_dbg(&client->dev, "Starting gl518 update\n");
651 
652  data->alarms = gl518_read_value(client, GL518_REG_INT);
653  data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
654 
655  val = gl518_read_value(client, GL518_REG_VDD_LIMIT);
656  data->voltage_min[0] = val & 0xff;
657  data->voltage_max[0] = (val >> 8) & 0xff;
658  val = gl518_read_value(client, GL518_REG_VIN1_LIMIT);
659  data->voltage_min[1] = val & 0xff;
660  data->voltage_max[1] = (val >> 8) & 0xff;
661  val = gl518_read_value(client, GL518_REG_VIN2_LIMIT);
662  data->voltage_min[2] = val & 0xff;
663  data->voltage_max[2] = (val >> 8) & 0xff;
664  val = gl518_read_value(client, GL518_REG_VIN3_LIMIT);
665  data->voltage_min[3] = val & 0xff;
666  data->voltage_max[3] = (val >> 8) & 0xff;
667 
668  val = gl518_read_value(client, GL518_REG_FAN_COUNT);
669  data->fan_in[0] = (val >> 8) & 0xff;
670  data->fan_in[1] = val & 0xff;
671 
672  val = gl518_read_value(client, GL518_REG_FAN_LIMIT);
673  data->fan_min[0] = (val >> 8) & 0xff;
674  data->fan_min[1] = val & 0xff;
675 
676  data->temp_in = gl518_read_value(client, GL518_REG_TEMP_IN);
677  data->temp_max =
678  gl518_read_value(client, GL518_REG_TEMP_MAX);
679  data->temp_hyst =
680  gl518_read_value(client, GL518_REG_TEMP_HYST);
681 
682  val = gl518_read_value(client, GL518_REG_MISC);
683  data->fan_div[0] = (val >> 6) & 0x03;
684  data->fan_div[1] = (val >> 4) & 0x03;
685  data->fan_auto1 = (val >> 3) & 0x01;
686 
687  data->alarms &= data->alarm_mask;
688 
689  val = gl518_read_value(client, GL518_REG_CONF);
690  data->beep_enable = (val >> 2) & 1;
691 
692  if (data->type != gl518sm_r00) {
693  data->voltage_in[0] =
694  gl518_read_value(client, GL518_REG_VDD);
695  data->voltage_in[1] =
696  gl518_read_value(client, GL518_REG_VIN1);
697  data->voltage_in[2] =
698  gl518_read_value(client, GL518_REG_VIN2);
699  }
700  data->voltage_in[3] =
701  gl518_read_value(client, GL518_REG_VIN3);
702 
703  data->last_updated = jiffies;
704  data->valid = 1;
705  }
706 
707  mutex_unlock(&data->update_lock);
708 
709  return data;
710 }
711 
712 module_i2c_driver(gl518_driver);
713 
714 MODULE_AUTHOR("Frodo Looijaard <[email protected]>, "
715  "Kyosti Malkki <[email protected]> and "
716  "Hong-Gunn Chew <[email protected]>");
717 MODULE_DESCRIPTION("GL518SM driver");
718 MODULE_LICENSE("GPL");
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