lp3971: Fix BUCK_VOL_CHANGE_SHIFT logic
[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:(val)+500)/1000)+119),0,255))
91 #define TEMP_FROM_REG(val)      (((val) - 119) * 1000)
92
93 static inline u8 FAN_TO_REG(long rpm, int div)
94 {
95         long rpmdiv;
96         if (rpm == 0)
97                 return 0;
98         rpmdiv = SENSORS_LIMIT(rpm, 1, 960000) * div;
99         return SENSORS_LIMIT((480000 + rpmdiv / 2) / rpmdiv, 1, 255);
100 }
101 #define FAN_FROM_REG(val,div)   ((val)==0 ? 0 : (480000/((val)*(div))))
102
103 #define IN_TO_REG(val)          (SENSORS_LIMIT((((val)+9)/19),0,255))
104 #define IN_FROM_REG(val)        ((val)*19)
105
106 #define VDD_TO_REG(val)         (SENSORS_LIMIT((((val)*4+47)/95),0,255))
107 #define VDD_FROM_REG(val)       (((val)*95+2)/4)
108
109 #define DIV_FROM_REG(val)       (1 << (val))
110
111 #define BEEP_MASK_TO_REG(val)   ((val) & 0x7f & data->alarm_mask)
112 #define BEEP_MASK_FROM_REG(val) ((val) & 0x7f)
113
114 /* Each client has this additional data */
115 struct gl518_data {
116         struct device *hwmon_dev;
117         enum chips type;
118
119         struct mutex update_lock;
120         char valid;             /* !=0 if following fields are valid */
121         unsigned long last_updated;     /* In jiffies */
122
123         u8 voltage_in[4];       /* Register values; [0] = VDD */
124         u8 voltage_min[4];      /* Register values; [0] = VDD */
125         u8 voltage_max[4];      /* Register values; [0] = VDD */
126         u8 fan_in[2];
127         u8 fan_min[2];
128         u8 fan_div[2];          /* Register encoding, shifted right */
129         u8 fan_auto1;           /* Boolean */
130         u8 temp_in;             /* Register values */
131         u8 temp_max;            /* Register values */
132         u8 temp_hyst;           /* Register values */
133         u8 alarms;              /* Register value */
134         u8 alarm_mask;
135         u8 beep_mask;           /* Register value */
136         u8 beep_enable;         /* Boolean */
137 };
138
139 static int gl518_probe(struct i2c_client *client,
140                        const struct i2c_device_id *id);
141 static int gl518_detect(struct i2c_client *client, struct i2c_board_info *info);
142 static void gl518_init_client(struct i2c_client *client);
143 static int gl518_remove(struct i2c_client *client);
144 static int gl518_read_value(struct i2c_client *client, u8 reg);
145 static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value);
146 static struct gl518_data *gl518_update_device(struct device *dev);
147
148 static const struct i2c_device_id gl518_id[] = {
149         { "gl518sm", 0 },
150         { }
151 };
152 MODULE_DEVICE_TABLE(i2c, gl518_id);
153
154 /* This is the driver that will be inserted */
155 static struct i2c_driver gl518_driver = {
156         .class          = I2C_CLASS_HWMON,
157         .driver = {
158                 .name   = "gl518sm",
159         },
160         .probe          = gl518_probe,
161         .remove         = gl518_remove,
162         .id_table       = gl518_id,
163         .detect         = gl518_detect,
164         .address_list   = normal_i2c,
165 };
166
167 /*
168  * Sysfs stuff
169  */
170
171 #define show(type, suffix, value)                                       \
172 static ssize_t show_##suffix(struct device *dev, struct device_attribute *attr, char *buf)              \
173 {                                                                       \
174         struct gl518_data *data = gl518_update_device(dev);             \
175         return sprintf(buf, "%d\n", type##_FROM_REG(data->value));      \
176 }
177
178 show(TEMP, temp_input1, temp_in);
179 show(TEMP, temp_max1, temp_max);
180 show(TEMP, temp_hyst1, temp_hyst);
181 show(BOOL, fan_auto1, fan_auto1);
182 show(VDD, in_input0, voltage_in[0]);
183 show(IN, in_input1, voltage_in[1]);
184 show(IN, in_input2, voltage_in[2]);
185 show(IN, in_input3, voltage_in[3]);
186 show(VDD, in_min0, voltage_min[0]);
187 show(IN, in_min1, voltage_min[1]);
188 show(IN, in_min2, voltage_min[2]);
189 show(IN, in_min3, voltage_min[3]);
190 show(VDD, in_max0, voltage_max[0]);
191 show(IN, in_max1, voltage_max[1]);
192 show(IN, in_max2, voltage_max[2]);
193 show(IN, in_max3, voltage_max[3]);
194 show(RAW, alarms, alarms);
195 show(BOOL, beep_enable, beep_enable);
196 show(BEEP_MASK, beep_mask, beep_mask);
197
198 static ssize_t show_fan_input(struct device *dev,
199                               struct device_attribute *attr, char *buf)
200 {
201         int nr = to_sensor_dev_attr(attr)->index;
202         struct gl518_data *data = gl518_update_device(dev);
203         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_in[nr],
204                                         DIV_FROM_REG(data->fan_div[nr])));
205 }
206
207 static ssize_t show_fan_min(struct device *dev,
208                             struct device_attribute *attr, char *buf)
209 {
210         int nr = to_sensor_dev_attr(attr)->index;
211         struct gl518_data *data = gl518_update_device(dev);
212         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
213                                         DIV_FROM_REG(data->fan_div[nr])));
214 }
215
216 static ssize_t show_fan_div(struct device *dev,
217                             struct device_attribute *attr, char *buf)
218 {
219         int nr = to_sensor_dev_attr(attr)->index;
220         struct gl518_data *data = gl518_update_device(dev);
221         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
222 }
223
224 #define set(type, suffix, value, reg)                                   \
225 static ssize_t set_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
226         size_t count)                                                   \
227 {                                                                       \
228         struct i2c_client *client = to_i2c_client(dev);                 \
229         struct gl518_data *data = i2c_get_clientdata(client);           \
230         long val = simple_strtol(buf, NULL, 10);                        \
231                                                                         \
232         mutex_lock(&data->update_lock);                                 \
233         data->value = type##_TO_REG(val);                               \
234         gl518_write_value(client, reg, data->value);                    \
235         mutex_unlock(&data->update_lock);                               \
236         return count;                                                   \
237 }
238
239 #define set_bits(type, suffix, value, reg, mask, shift)                 \
240 static ssize_t set_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
241         size_t count)                                                   \
242 {                                                                       \
243         struct i2c_client *client = to_i2c_client(dev);                 \
244         struct gl518_data *data = i2c_get_clientdata(client);           \
245         int regvalue;                                                   \
246         unsigned long val = simple_strtoul(buf, NULL, 10);              \
247                                                                         \
248         mutex_lock(&data->update_lock);                                 \
249         regvalue = gl518_read_value(client, reg);                       \
250         data->value = type##_TO_REG(val);                               \
251         regvalue = (regvalue & ~mask) | (data->value << shift);         \
252         gl518_write_value(client, reg, regvalue);                       \
253         mutex_unlock(&data->update_lock);                               \
254         return count;                                                   \
255 }
256
257 #define set_low(type, suffix, value, reg)                               \
258         set_bits(type, suffix, value, reg, 0x00ff, 0)
259 #define set_high(type, suffix, value, reg)                              \
260         set_bits(type, suffix, value, reg, 0xff00, 8)
261
262 set(TEMP, temp_max1, temp_max, GL518_REG_TEMP_MAX);
263 set(TEMP, temp_hyst1, temp_hyst, GL518_REG_TEMP_HYST);
264 set_bits(BOOL, fan_auto1, fan_auto1, GL518_REG_MISC, 0x08, 3);
265 set_low(VDD, in_min0, voltage_min[0], GL518_REG_VDD_LIMIT);
266 set_low(IN, in_min1, voltage_min[1], GL518_REG_VIN1_LIMIT);
267 set_low(IN, in_min2, voltage_min[2], GL518_REG_VIN2_LIMIT);
268 set_low(IN, in_min3, voltage_min[3], GL518_REG_VIN3_LIMIT);
269 set_high(VDD, in_max0, voltage_max[0], GL518_REG_VDD_LIMIT);
270 set_high(IN, in_max1, voltage_max[1], GL518_REG_VIN1_LIMIT);
271 set_high(IN, in_max2, voltage_max[2], GL518_REG_VIN2_LIMIT);
272 set_high(IN, in_max3, voltage_max[3], GL518_REG_VIN3_LIMIT);
273 set_bits(BOOL, beep_enable, beep_enable, GL518_REG_CONF, 0x04, 2);
274 set(BEEP_MASK, beep_mask, beep_mask, GL518_REG_ALARM);
275
276 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
277                            const char *buf, size_t count)
278 {
279         struct i2c_client *client = to_i2c_client(dev);
280         struct gl518_data *data = i2c_get_clientdata(client);
281         int nr = to_sensor_dev_attr(attr)->index;
282         int regvalue;
283         unsigned long val = simple_strtoul(buf, NULL, 10);
284
285         mutex_lock(&data->update_lock);
286         regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
287         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
288         regvalue = (regvalue & (0xff << (8 * nr)))
289                  | (data->fan_min[nr] << (8 * (1 - nr)));
290         gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);
291
292         data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
293         if (data->fan_min[nr] == 0)
294                 data->alarm_mask &= ~(0x20 << nr);
295         else
296                 data->alarm_mask |= (0x20 << nr);
297         data->beep_mask &= data->alarm_mask;
298         gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
299
300         mutex_unlock(&data->update_lock);
301         return count;
302 }
303
304 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
305                            const char *buf, size_t count)
306 {
307         struct i2c_client *client = to_i2c_client(dev);
308         struct gl518_data *data = i2c_get_clientdata(client);
309         int nr = to_sensor_dev_attr(attr)->index;
310         int regvalue;
311         unsigned long val = simple_strtoul(buf, NULL, 10);
312
313         switch (val) {
314         case 1: val = 0; break;
315         case 2: val = 1; break;
316         case 4: val = 2; break;
317         case 8: val = 3; break;
318         default:
319                 dev_err(dev, "Invalid fan clock divider %lu, choose one "
320                         "of 1, 2, 4 or 8\n", val);
321                 return -EINVAL;
322         }
323
324         mutex_lock(&data->update_lock);
325         regvalue = gl518_read_value(client, GL518_REG_MISC);
326         data->fan_div[nr] = val;
327         regvalue = (regvalue & ~(0xc0 >> (2 * nr)))
328                  | (data->fan_div[nr] << (6 - 2 * nr));
329         gl518_write_value(client, GL518_REG_MISC, regvalue);
330         mutex_unlock(&data->update_lock);
331         return count;
332 }
333
334 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
335 static DEVICE_ATTR(temp1_max, S_IWUSR|S_IRUGO, show_temp_max1, set_temp_max1);
336 static DEVICE_ATTR(temp1_max_hyst, S_IWUSR|S_IRUGO,
337         show_temp_hyst1, set_temp_hyst1);
338 static DEVICE_ATTR(fan1_auto, S_IWUSR|S_IRUGO, show_fan_auto1, set_fan_auto1);
339 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
340 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
341 static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR|S_IRUGO,
342         show_fan_min, set_fan_min, 0);
343 static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR|S_IRUGO,
344         show_fan_min, set_fan_min, 1);
345 static SENSOR_DEVICE_ATTR(fan1_div, S_IWUSR|S_IRUGO,
346         show_fan_div, set_fan_div, 0);
347 static SENSOR_DEVICE_ATTR(fan2_div, S_IWUSR|S_IRUGO,
348         show_fan_div, set_fan_div, 1);
349 static DEVICE_ATTR(in0_input, S_IRUGO, show_in_input0, NULL);
350 static DEVICE_ATTR(in1_input, S_IRUGO, show_in_input1, NULL);
351 static DEVICE_ATTR(in2_input, S_IRUGO, show_in_input2, NULL);
352 static DEVICE_ATTR(in3_input, S_IRUGO, show_in_input3, NULL);
353 static DEVICE_ATTR(in0_min, S_IWUSR|S_IRUGO, show_in_min0, set_in_min0);
354 static DEVICE_ATTR(in1_min, S_IWUSR|S_IRUGO, show_in_min1, set_in_min1);
355 static DEVICE_ATTR(in2_min, S_IWUSR|S_IRUGO, show_in_min2, set_in_min2);
356 static DEVICE_ATTR(in3_min, S_IWUSR|S_IRUGO, show_in_min3, set_in_min3);
357 static DEVICE_ATTR(in0_max, S_IWUSR|S_IRUGO, show_in_max0, set_in_max0);
358 static DEVICE_ATTR(in1_max, S_IWUSR|S_IRUGO, show_in_max1, set_in_max1);
359 static DEVICE_ATTR(in2_max, S_IWUSR|S_IRUGO, show_in_max2, set_in_max2);
360 static DEVICE_ATTR(in3_max, S_IWUSR|S_IRUGO, show_in_max3, set_in_max3);
361 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
362 static DEVICE_ATTR(beep_enable, S_IWUSR|S_IRUGO,
363         show_beep_enable, set_beep_enable);
364 static DEVICE_ATTR(beep_mask, S_IWUSR|S_IRUGO,
365         show_beep_mask, set_beep_mask);
366
367 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
368                           char *buf)
369 {
370         int bitnr = to_sensor_dev_attr(attr)->index;
371         struct gl518_data *data = gl518_update_device(dev);
372         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
373 }
374
375 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
376 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
377 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
378 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
379 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
380 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 5);
381 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 6);
382
383 static ssize_t show_beep(struct device *dev, struct device_attribute *attr,
384                           char *buf)
385 {
386         int bitnr = to_sensor_dev_attr(attr)->index;
387         struct gl518_data *data = gl518_update_device(dev);
388         return sprintf(buf, "%u\n", (data->beep_mask >> bitnr) & 1);
389 }
390
391 static ssize_t set_beep(struct device *dev, struct device_attribute *attr,
392                         const char *buf, size_t count)
393 {
394         struct i2c_client *client = to_i2c_client(dev);
395         struct gl518_data *data = i2c_get_clientdata(client);
396         int bitnr = to_sensor_dev_attr(attr)->index;
397         unsigned long bit;
398
399         bit = simple_strtoul(buf, NULL, 10);
400         if (bit & ~1)
401                 return -EINVAL;
402
403         mutex_lock(&data->update_lock);
404         data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
405         if (bit)
406                 data->beep_mask |= (1 << bitnr);
407         else
408                 data->beep_mask &= ~(1 << bitnr);
409         gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
410         mutex_unlock(&data->update_lock);
411         return count;
412 }
413
414 static SENSOR_DEVICE_ATTR(in0_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 0);
415 static SENSOR_DEVICE_ATTR(in1_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 1);
416 static SENSOR_DEVICE_ATTR(in2_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 2);
417 static SENSOR_DEVICE_ATTR(in3_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 3);
418 static SENSOR_DEVICE_ATTR(temp1_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 4);
419 static SENSOR_DEVICE_ATTR(fan1_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 5);
420 static SENSOR_DEVICE_ATTR(fan2_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 6);
421
422 static struct attribute *gl518_attributes[] = {
423         &dev_attr_in3_input.attr,
424         &dev_attr_in0_min.attr,
425         &dev_attr_in1_min.attr,
426         &dev_attr_in2_min.attr,
427         &dev_attr_in3_min.attr,
428         &dev_attr_in0_max.attr,
429         &dev_attr_in1_max.attr,
430         &dev_attr_in2_max.attr,
431         &dev_attr_in3_max.attr,
432         &sensor_dev_attr_in0_alarm.dev_attr.attr,
433         &sensor_dev_attr_in1_alarm.dev_attr.attr,
434         &sensor_dev_attr_in2_alarm.dev_attr.attr,
435         &sensor_dev_attr_in3_alarm.dev_attr.attr,
436         &sensor_dev_attr_in0_beep.dev_attr.attr,
437         &sensor_dev_attr_in1_beep.dev_attr.attr,
438         &sensor_dev_attr_in2_beep.dev_attr.attr,
439         &sensor_dev_attr_in3_beep.dev_attr.attr,
440
441         &dev_attr_fan1_auto.attr,
442         &sensor_dev_attr_fan1_input.dev_attr.attr,
443         &sensor_dev_attr_fan2_input.dev_attr.attr,
444         &sensor_dev_attr_fan1_min.dev_attr.attr,
445         &sensor_dev_attr_fan2_min.dev_attr.attr,
446         &sensor_dev_attr_fan1_div.dev_attr.attr,
447         &sensor_dev_attr_fan2_div.dev_attr.attr,
448         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
449         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
450         &sensor_dev_attr_fan1_beep.dev_attr.attr,
451         &sensor_dev_attr_fan2_beep.dev_attr.attr,
452
453         &dev_attr_temp1_input.attr,
454         &dev_attr_temp1_max.attr,
455         &dev_attr_temp1_max_hyst.attr,
456         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
457         &sensor_dev_attr_temp1_beep.dev_attr.attr,
458
459         &dev_attr_alarms.attr,
460         &dev_attr_beep_enable.attr,
461         &dev_attr_beep_mask.attr,
462         NULL
463 };
464
465 static const struct attribute_group gl518_group = {
466         .attrs = gl518_attributes,
467 };
468
469 static struct attribute *gl518_attributes_r80[] = {
470         &dev_attr_in0_input.attr,
471         &dev_attr_in1_input.attr,
472         &dev_attr_in2_input.attr,
473         NULL
474 };
475
476 static const struct attribute_group gl518_group_r80 = {
477         .attrs = gl518_attributes_r80,
478 };
479
480 /*
481  * Real code
482  */
483
484 /* Return 0 if detection is successful, -ENODEV otherwise */
485 static int gl518_detect(struct i2c_client *client, struct i2c_board_info *info)
486 {
487         struct i2c_adapter *adapter = client->adapter;
488         int rev;
489
490         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
491                                      I2C_FUNC_SMBUS_WORD_DATA))
492                 return -ENODEV;
493
494         /* Now, we do the remaining detection. */
495         if ((gl518_read_value(client, GL518_REG_CHIP_ID) != 0x80)
496          || (gl518_read_value(client, GL518_REG_CONF) & 0x80))
497                 return -ENODEV;
498
499         /* Determine the chip type. */
500         rev = gl518_read_value(client, GL518_REG_REVISION);
501         if (rev != 0x00 && rev != 0x80)
502                 return -ENODEV;
503
504         strlcpy(info->type, "gl518sm", I2C_NAME_SIZE);
505
506         return 0;
507 }
508
509 static int gl518_probe(struct i2c_client *client,
510                        const struct i2c_device_id *id)
511 {
512         struct gl518_data *data;
513         int err, revision;
514
515         data = kzalloc(sizeof(struct gl518_data), GFP_KERNEL);
516         if (!data) {
517                 err = -ENOMEM;
518                 goto exit;
519         }
520
521         i2c_set_clientdata(client, data);
522         revision = gl518_read_value(client, GL518_REG_REVISION);
523         data->type = revision == 0x80 ? gl518sm_r80 : gl518sm_r00;
524         mutex_init(&data->update_lock);
525
526         /* Initialize the GL518SM chip */
527         data->alarm_mask = 0xff;
528         gl518_init_client(client);
529
530         /* Register sysfs hooks */
531         if ((err = sysfs_create_group(&client->dev.kobj, &gl518_group)))
532                 goto exit_free;
533         if (data->type == gl518sm_r80)
534                 if ((err = sysfs_create_group(&client->dev.kobj,
535                                               &gl518_group_r80)))
536                         goto exit_remove_files;
537
538         data->hwmon_dev = hwmon_device_register(&client->dev);
539         if (IS_ERR(data->hwmon_dev)) {
540                 err = PTR_ERR(data->hwmon_dev);
541                 goto exit_remove_files;
542         }
543
544         return 0;
545
546 exit_remove_files:
547         sysfs_remove_group(&client->dev.kobj, &gl518_group);
548         if (data->type == gl518sm_r80)
549                 sysfs_remove_group(&client->dev.kobj, &gl518_group_r80);
550 exit_free:
551         kfree(data);
552 exit:
553         return err;
554 }
555
556
557 /* Called when we have found a new GL518SM.
558    Note that we preserve D4:NoFan2 and D2:beep_enable. */
559 static void gl518_init_client(struct i2c_client *client)
560 {
561         /* Make sure we leave D7:Reset untouched */
562         u8 regvalue = gl518_read_value(client, GL518_REG_CONF) & 0x7f;
563
564         /* Comparator mode (D3=0), standby mode (D6=0) */
565         gl518_write_value(client, GL518_REG_CONF, (regvalue &= 0x37));
566
567         /* Never interrupts */
568         gl518_write_value(client, GL518_REG_MASK, 0x00);
569
570         /* Clear status register (D5=1), start (D6=1) */
571         gl518_write_value(client, GL518_REG_CONF, 0x20 | regvalue);
572         gl518_write_value(client, GL518_REG_CONF, 0x40 | regvalue);
573 }
574
575 static int gl518_remove(struct i2c_client *client)
576 {
577         struct gl518_data *data = i2c_get_clientdata(client);
578
579         hwmon_device_unregister(data->hwmon_dev);
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
584         kfree(data);
585         return 0;
586 }
587
588 /* Registers 0x07 to 0x0c are word-sized, others are byte-sized
589    GL518 uses a high-byte first convention, which is exactly opposite to
590    the SMBus standard. */
591 static int gl518_read_value(struct i2c_client *client, u8 reg)
592 {
593         if ((reg >= 0x07) && (reg <= 0x0c))
594                 return swab16(i2c_smbus_read_word_data(client, reg));
595         else
596                 return i2c_smbus_read_byte_data(client, reg);
597 }
598
599 static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value)
600 {
601         if ((reg >= 0x07) && (reg <= 0x0c))
602                 return i2c_smbus_write_word_data(client, reg, swab16(value));
603         else
604                 return i2c_smbus_write_byte_data(client, reg, value);
605 }
606
607 static struct gl518_data *gl518_update_device(struct device *dev)
608 {
609         struct i2c_client *client = to_i2c_client(dev);
610         struct gl518_data *data = i2c_get_clientdata(client);
611         int val;
612
613         mutex_lock(&data->update_lock);
614
615         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
616             || !data->valid) {
617                 dev_dbg(&client->dev, "Starting gl518 update\n");
618
619                 data->alarms = gl518_read_value(client, GL518_REG_INT);
620                 data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
621
622                 val = gl518_read_value(client, GL518_REG_VDD_LIMIT);
623                 data->voltage_min[0] = val & 0xff;
624                 data->voltage_max[0] = (val >> 8) & 0xff;
625                 val = gl518_read_value(client, GL518_REG_VIN1_LIMIT);
626                 data->voltage_min[1] = val & 0xff;
627                 data->voltage_max[1] = (val >> 8) & 0xff;
628                 val = gl518_read_value(client, GL518_REG_VIN2_LIMIT);
629                 data->voltage_min[2] = val & 0xff;
630                 data->voltage_max[2] = (val >> 8) & 0xff;
631                 val = gl518_read_value(client, GL518_REG_VIN3_LIMIT);
632                 data->voltage_min[3] = val & 0xff;
633                 data->voltage_max[3] = (val >> 8) & 0xff;
634
635                 val = gl518_read_value(client, GL518_REG_FAN_COUNT);
636                 data->fan_in[0] = (val >> 8) & 0xff;
637                 data->fan_in[1] = val & 0xff;
638
639                 val = gl518_read_value(client, GL518_REG_FAN_LIMIT);
640                 data->fan_min[0] = (val >> 8) & 0xff;
641                 data->fan_min[1] = val & 0xff;
642
643                 data->temp_in = gl518_read_value(client, GL518_REG_TEMP_IN);
644                 data->temp_max =
645                     gl518_read_value(client, GL518_REG_TEMP_MAX);
646                 data->temp_hyst =
647                     gl518_read_value(client, GL518_REG_TEMP_HYST);
648
649                 val = gl518_read_value(client, GL518_REG_MISC);
650                 data->fan_div[0] = (val >> 6) & 0x03;
651                 data->fan_div[1] = (val >> 4) & 0x03;
652                 data->fan_auto1  = (val >> 3) & 0x01;
653
654                 data->alarms &= data->alarm_mask;
655
656                 val = gl518_read_value(client, GL518_REG_CONF);
657                 data->beep_enable = (val >> 2) & 1;
658
659                 if (data->type != gl518sm_r00) {
660                         data->voltage_in[0] =
661                             gl518_read_value(client, GL518_REG_VDD);
662                         data->voltage_in[1] =
663                             gl518_read_value(client, GL518_REG_VIN1);
664                         data->voltage_in[2] =
665                             gl518_read_value(client, GL518_REG_VIN2);
666                 }
667                 data->voltage_in[3] =
668                     gl518_read_value(client, GL518_REG_VIN3);
669
670                 data->last_updated = jiffies;
671                 data->valid = 1;
672         }
673
674         mutex_unlock(&data->update_lock);
675
676         return data;
677 }
678
679 static int __init sensors_gl518sm_init(void)
680 {
681         return i2c_add_driver(&gl518_driver);
682 }
683
684 static void __exit sensors_gl518sm_exit(void)
685 {
686         i2c_del_driver(&gl518_driver);
687 }
688
689 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
690         "Kyosti Malkki <kmalkki@cc.hut.fi> and "
691         "Hong-Gunn Chew <hglinux@gunnet.org>");
692 MODULE_DESCRIPTION("GL518SM driver");
693 MODULE_LICENSE("GPL");
694
695 module_init(sensors_gl518sm_init);
696 module_exit(sensors_gl518sm_exit);