Merge commit 'main-jb-2012.08.03-B4' into t114-0806
[linux-2.6.git] / drivers / hwmon / gl518sm.c
1 /*
2  * gl518sm.c - Part of lm_sensors, Linux kernel modules for hardware
3  *             monitoring
4  * Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
5  * Kyosti Malkki <kmalkki@cc.hut.fi>
6  * Copyright (C) 2004 Hong-Gunn Chew <hglinux@gunnet.org> and
7  * Jean Delvare <khali@linux-fr.org>
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 = kzalloc(sizeof(struct gl518_data), GFP_KERNEL);
548         if (!data) {
549                 err = -ENOMEM;
550                 goto exit;
551         }
552
553         i2c_set_clientdata(client, data);
554         revision = gl518_read_value(client, GL518_REG_REVISION);
555         data->type = revision == 0x80 ? gl518sm_r80 : gl518sm_r00;
556         mutex_init(&data->update_lock);
557
558         /* Initialize the GL518SM chip */
559         data->alarm_mask = 0xff;
560         gl518_init_client(client);
561
562         /* Register sysfs hooks */
563         err = sysfs_create_group(&client->dev.kobj, &gl518_group);
564         if (err)
565                 goto exit_free;
566         if (data->type == gl518sm_r80) {
567                 err = sysfs_create_group(&client->dev.kobj, &gl518_group_r80);
568                 if (err)
569                         goto exit_remove_files;
570         }
571
572         data->hwmon_dev = hwmon_device_register(&client->dev);
573         if (IS_ERR(data->hwmon_dev)) {
574                 err = PTR_ERR(data->hwmon_dev);
575                 goto exit_remove_files;
576         }
577
578         return 0;
579
580 exit_remove_files:
581         sysfs_remove_group(&client->dev.kobj, &gl518_group);
582         if (data->type == gl518sm_r80)
583                 sysfs_remove_group(&client->dev.kobj, &gl518_group_r80);
584 exit_free:
585         kfree(data);
586 exit:
587         return err;
588 }
589
590
591 /*
592  * Called when we have found a new GL518SM.
593  * Note that we preserve D4:NoFan2 and D2:beep_enable.
594  */
595 static void gl518_init_client(struct i2c_client *client)
596 {
597         /* Make sure we leave D7:Reset untouched */
598         u8 regvalue = gl518_read_value(client, GL518_REG_CONF) & 0x7f;
599
600         /* Comparator mode (D3=0), standby mode (D6=0) */
601         gl518_write_value(client, GL518_REG_CONF, (regvalue &= 0x37));
602
603         /* Never interrupts */
604         gl518_write_value(client, GL518_REG_MASK, 0x00);
605
606         /* Clear status register (D5=1), start (D6=1) */
607         gl518_write_value(client, GL518_REG_CONF, 0x20 | regvalue);
608         gl518_write_value(client, GL518_REG_CONF, 0x40 | regvalue);
609 }
610
611 static int gl518_remove(struct i2c_client *client)
612 {
613         struct gl518_data *data = i2c_get_clientdata(client);
614
615         hwmon_device_unregister(data->hwmon_dev);
616         sysfs_remove_group(&client->dev.kobj, &gl518_group);
617         if (data->type == gl518sm_r80)
618                 sysfs_remove_group(&client->dev.kobj, &gl518_group_r80);
619
620         kfree(data);
621         return 0;
622 }
623
624 /*
625  * Registers 0x07 to 0x0c are word-sized, others are byte-sized
626  * GL518 uses a high-byte first convention, which is exactly opposite to
627  * the SMBus standard.
628  */
629 static int gl518_read_value(struct i2c_client *client, u8 reg)
630 {
631         if ((reg >= 0x07) && (reg <= 0x0c))
632                 return i2c_smbus_read_word_swapped(client, reg);
633         else
634                 return i2c_smbus_read_byte_data(client, reg);
635 }
636
637 static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value)
638 {
639         if ((reg >= 0x07) && (reg <= 0x0c))
640                 return i2c_smbus_write_word_swapped(client, reg, value);
641         else
642                 return i2c_smbus_write_byte_data(client, reg, value);
643 }
644
645 static struct gl518_data *gl518_update_device(struct device *dev)
646 {
647         struct i2c_client *client = to_i2c_client(dev);
648         struct gl518_data *data = i2c_get_clientdata(client);
649         int val;
650
651         mutex_lock(&data->update_lock);
652
653         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
654             || !data->valid) {
655                 dev_dbg(&client->dev, "Starting gl518 update\n");
656
657                 data->alarms = gl518_read_value(client, GL518_REG_INT);
658                 data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
659
660                 val = gl518_read_value(client, GL518_REG_VDD_LIMIT);
661                 data->voltage_min[0] = val & 0xff;
662                 data->voltage_max[0] = (val >> 8) & 0xff;
663                 val = gl518_read_value(client, GL518_REG_VIN1_LIMIT);
664                 data->voltage_min[1] = val & 0xff;
665                 data->voltage_max[1] = (val >> 8) & 0xff;
666                 val = gl518_read_value(client, GL518_REG_VIN2_LIMIT);
667                 data->voltage_min[2] = val & 0xff;
668                 data->voltage_max[2] = (val >> 8) & 0xff;
669                 val = gl518_read_value(client, GL518_REG_VIN3_LIMIT);
670                 data->voltage_min[3] = val & 0xff;
671                 data->voltage_max[3] = (val >> 8) & 0xff;
672
673                 val = gl518_read_value(client, GL518_REG_FAN_COUNT);
674                 data->fan_in[0] = (val >> 8) & 0xff;
675                 data->fan_in[1] = val & 0xff;
676
677                 val = gl518_read_value(client, GL518_REG_FAN_LIMIT);
678                 data->fan_min[0] = (val >> 8) & 0xff;
679                 data->fan_min[1] = val & 0xff;
680
681                 data->temp_in = gl518_read_value(client, GL518_REG_TEMP_IN);
682                 data->temp_max =
683                     gl518_read_value(client, GL518_REG_TEMP_MAX);
684                 data->temp_hyst =
685                     gl518_read_value(client, GL518_REG_TEMP_HYST);
686
687                 val = gl518_read_value(client, GL518_REG_MISC);
688                 data->fan_div[0] = (val >> 6) & 0x03;
689                 data->fan_div[1] = (val >> 4) & 0x03;
690                 data->fan_auto1  = (val >> 3) & 0x01;
691
692                 data->alarms &= data->alarm_mask;
693
694                 val = gl518_read_value(client, GL518_REG_CONF);
695                 data->beep_enable = (val >> 2) & 1;
696
697                 if (data->type != gl518sm_r00) {
698                         data->voltage_in[0] =
699                             gl518_read_value(client, GL518_REG_VDD);
700                         data->voltage_in[1] =
701                             gl518_read_value(client, GL518_REG_VIN1);
702                         data->voltage_in[2] =
703                             gl518_read_value(client, GL518_REG_VIN2);
704                 }
705                 data->voltage_in[3] =
706                     gl518_read_value(client, GL518_REG_VIN3);
707
708                 data->last_updated = jiffies;
709                 data->valid = 1;
710         }
711
712         mutex_unlock(&data->update_lock);
713
714         return data;
715 }
716
717 module_i2c_driver(gl518_driver);
718
719 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
720         "Kyosti Malkki <kmalkki@cc.hut.fi> and "
721         "Hong-Gunn Chew <hglinux@gunnet.org>");
722 MODULE_DESCRIPTION("GL518SM driver");
723 MODULE_LICENSE("GPL");