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[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 /* Insmod parameters */
50 I2C_CLIENT_INSMOD_2(gl518sm_r00, gl518sm_r80);
51
52 /* Many GL518 constants specified below */
53
54 /* The GL518 registers */
55 #define GL518_REG_CHIP_ID       0x00
56 #define GL518_REG_REVISION      0x01
57 #define GL518_REG_VENDOR_ID     0x02
58 #define GL518_REG_CONF          0x03
59 #define GL518_REG_TEMP_IN       0x04
60 #define GL518_REG_TEMP_MAX      0x05
61 #define GL518_REG_TEMP_HYST     0x06
62 #define GL518_REG_FAN_COUNT     0x07
63 #define GL518_REG_FAN_LIMIT     0x08
64 #define GL518_REG_VIN1_LIMIT    0x09
65 #define GL518_REG_VIN2_LIMIT    0x0a
66 #define GL518_REG_VIN3_LIMIT    0x0b
67 #define GL518_REG_VDD_LIMIT     0x0c
68 #define GL518_REG_VIN3          0x0d
69 #define GL518_REG_MISC          0x0f
70 #define GL518_REG_ALARM         0x10
71 #define GL518_REG_MASK          0x11
72 #define GL518_REG_INT           0x12
73 #define GL518_REG_VIN2          0x13
74 #define GL518_REG_VIN1          0x14
75 #define GL518_REG_VDD           0x15
76
77
78 /*
79  * Conversions. Rounding and limit checking is only done on the TO_REG
80  * variants. Note that you should be a bit careful with which arguments
81  * these macros are called: arguments may be evaluated more than once.
82  * Fixing this is just not worth it.
83  */
84
85 #define RAW_FROM_REG(val)       val
86
87 #define BOOL_FROM_REG(val)      ((val)?0:1)
88 #define BOOL_TO_REG(val)        ((val)?0:1)
89
90 #define TEMP_TO_REG(val)        (SENSORS_LIMIT(((((val)<0? \
91                                 (val)-500:(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, int kind,
143                         struct i2c_board_info *info);
144 static void gl518_init_client(struct i2c_client *client);
145 static int gl518_remove(struct i2c_client *client);
146 static int gl518_read_value(struct i2c_client *client, u8 reg);
147 static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value);
148 static struct gl518_data *gl518_update_device(struct device *dev);
149
150 static const struct i2c_device_id gl518_id[] = {
151         { "gl518sm", 0 },
152         { }
153 };
154 MODULE_DEVICE_TABLE(i2c, gl518_id);
155
156 /* This is the driver that will be inserted */
157 static struct i2c_driver gl518_driver = {
158         .class          = I2C_CLASS_HWMON,
159         .driver = {
160                 .name   = "gl518sm",
161         },
162         .probe          = gl518_probe,
163         .remove         = gl518_remove,
164         .id_table       = gl518_id,
165         .detect         = gl518_detect,
166         .address_data   = &addr_data,
167 };
168
169 /*
170  * Sysfs stuff
171  */
172
173 #define show(type, suffix, value)                                       \
174 static ssize_t show_##suffix(struct device *dev, 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, struct device_attribute *attr, const char *buf, \
228         size_t count)                                                   \
229 {                                                                       \
230         struct i2c_client *client = to_i2c_client(dev);                 \
231         struct gl518_data *data = i2c_get_clientdata(client);           \
232         long val = simple_strtol(buf, NULL, 10);                        \
233                                                                         \
234         mutex_lock(&data->update_lock);                                 \
235         data->value = type##_TO_REG(val);                               \
236         gl518_write_value(client, reg, data->value);                    \
237         mutex_unlock(&data->update_lock);                               \
238         return count;                                                   \
239 }
240
241 #define set_bits(type, suffix, value, reg, mask, shift)                 \
242 static ssize_t set_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
243         size_t count)                                                   \
244 {                                                                       \
245         struct i2c_client *client = to_i2c_client(dev);                 \
246         struct gl518_data *data = i2c_get_clientdata(client);           \
247         int regvalue;                                                   \
248         unsigned long val = simple_strtoul(buf, NULL, 10);              \
249                                                                         \
250         mutex_lock(&data->update_lock);                                 \
251         regvalue = gl518_read_value(client, reg);                       \
252         data->value = type##_TO_REG(val);                               \
253         regvalue = (regvalue & ~mask) | (data->value << shift);         \
254         gl518_write_value(client, reg, regvalue);                       \
255         mutex_unlock(&data->update_lock);                               \
256         return count;                                                   \
257 }
258
259 #define set_low(type, suffix, value, reg)                               \
260         set_bits(type, suffix, value, reg, 0x00ff, 0)
261 #define set_high(type, suffix, value, reg)                              \
262         set_bits(type, suffix, value, reg, 0xff00, 8)
263
264 set(TEMP, temp_max1, temp_max, GL518_REG_TEMP_MAX);
265 set(TEMP, temp_hyst1, temp_hyst, GL518_REG_TEMP_HYST);
266 set_bits(BOOL, fan_auto1, fan_auto1, GL518_REG_MISC, 0x08, 3);
267 set_low(VDD, in_min0, voltage_min[0], GL518_REG_VDD_LIMIT);
268 set_low(IN, in_min1, voltage_min[1], GL518_REG_VIN1_LIMIT);
269 set_low(IN, in_min2, voltage_min[2], GL518_REG_VIN2_LIMIT);
270 set_low(IN, in_min3, voltage_min[3], GL518_REG_VIN3_LIMIT);
271 set_high(VDD, in_max0, voltage_max[0], GL518_REG_VDD_LIMIT);
272 set_high(IN, in_max1, voltage_max[1], GL518_REG_VIN1_LIMIT);
273 set_high(IN, in_max2, voltage_max[2], GL518_REG_VIN2_LIMIT);
274 set_high(IN, in_max3, voltage_max[3], GL518_REG_VIN3_LIMIT);
275 set_bits(BOOL, beep_enable, beep_enable, GL518_REG_CONF, 0x04, 2);
276 set(BEEP_MASK, beep_mask, beep_mask, GL518_REG_ALARM);
277
278 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
279                            const char *buf, size_t count)
280 {
281         struct i2c_client *client = to_i2c_client(dev);
282         struct gl518_data *data = i2c_get_clientdata(client);
283         int nr = to_sensor_dev_attr(attr)->index;
284         int regvalue;
285         unsigned long val = simple_strtoul(buf, NULL, 10);
286
287         mutex_lock(&data->update_lock);
288         regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
289         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
290         regvalue = (regvalue & (0xff << (8 * nr)))
291                  | (data->fan_min[nr] << (8 * (1 - nr)));
292         gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);
293
294         data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
295         if (data->fan_min[nr] == 0)
296                 data->alarm_mask &= ~(0x20 << nr);
297         else
298                 data->alarm_mask |= (0x20 << nr);
299         data->beep_mask &= data->alarm_mask;
300         gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
301
302         mutex_unlock(&data->update_lock);
303         return count;
304 }
305
306 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
307                            const char *buf, size_t count)
308 {
309         struct i2c_client *client = to_i2c_client(dev);
310         struct gl518_data *data = i2c_get_clientdata(client);
311         int nr = to_sensor_dev_attr(attr)->index;
312         int regvalue;
313         unsigned long val = simple_strtoul(buf, NULL, 10);
314
315         switch (val) {
316         case 1: val = 0; break;
317         case 2: val = 1; break;
318         case 4: val = 2; break;
319         case 8: val = 3; break;
320         default:
321                 dev_err(dev, "Invalid fan clock divider %lu, choose one "
322                         "of 1, 2, 4 or 8\n", val);
323                 return -EINVAL;
324         }
325
326         mutex_lock(&data->update_lock);
327         regvalue = gl518_read_value(client, GL518_REG_MISC);
328         data->fan_div[nr] = val;
329         regvalue = (regvalue & ~(0xc0 >> (2 * nr)))
330                  | (data->fan_div[nr] << (6 - 2 * nr));
331         gl518_write_value(client, GL518_REG_MISC, regvalue);
332         mutex_unlock(&data->update_lock);
333         return count;
334 }
335
336 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
337 static DEVICE_ATTR(temp1_max, S_IWUSR|S_IRUGO, show_temp_max1, set_temp_max1);
338 static DEVICE_ATTR(temp1_max_hyst, S_IWUSR|S_IRUGO,
339         show_temp_hyst1, set_temp_hyst1);
340 static DEVICE_ATTR(fan1_auto, S_IWUSR|S_IRUGO, show_fan_auto1, set_fan_auto1);
341 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
342 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
343 static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR|S_IRUGO,
344         show_fan_min, set_fan_min, 0);
345 static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR|S_IRUGO,
346         show_fan_min, set_fan_min, 1);
347 static SENSOR_DEVICE_ATTR(fan1_div, S_IWUSR|S_IRUGO,
348         show_fan_div, set_fan_div, 0);
349 static SENSOR_DEVICE_ATTR(fan2_div, S_IWUSR|S_IRUGO,
350         show_fan_div, set_fan_div, 1);
351 static DEVICE_ATTR(in0_input, S_IRUGO, show_in_input0, NULL);
352 static DEVICE_ATTR(in1_input, S_IRUGO, show_in_input1, NULL);
353 static DEVICE_ATTR(in2_input, S_IRUGO, show_in_input2, NULL);
354 static DEVICE_ATTR(in3_input, S_IRUGO, show_in_input3, NULL);
355 static DEVICE_ATTR(in0_min, S_IWUSR|S_IRUGO, show_in_min0, set_in_min0);
356 static DEVICE_ATTR(in1_min, S_IWUSR|S_IRUGO, show_in_min1, set_in_min1);
357 static DEVICE_ATTR(in2_min, S_IWUSR|S_IRUGO, show_in_min2, set_in_min2);
358 static DEVICE_ATTR(in3_min, S_IWUSR|S_IRUGO, show_in_min3, set_in_min3);
359 static DEVICE_ATTR(in0_max, S_IWUSR|S_IRUGO, show_in_max0, set_in_max0);
360 static DEVICE_ATTR(in1_max, S_IWUSR|S_IRUGO, show_in_max1, set_in_max1);
361 static DEVICE_ATTR(in2_max, S_IWUSR|S_IRUGO, show_in_max2, set_in_max2);
362 static DEVICE_ATTR(in3_max, S_IWUSR|S_IRUGO, show_in_max3, set_in_max3);
363 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
364 static DEVICE_ATTR(beep_enable, S_IWUSR|S_IRUGO,
365         show_beep_enable, set_beep_enable);
366 static DEVICE_ATTR(beep_mask, S_IWUSR|S_IRUGO,
367         show_beep_mask, set_beep_mask);
368
369 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
370                           char *buf)
371 {
372         int bitnr = to_sensor_dev_attr(attr)->index;
373         struct gl518_data *data = gl518_update_device(dev);
374         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
375 }
376
377 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
378 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
379 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
380 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
381 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
382 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 5);
383 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 6);
384
385 static ssize_t show_beep(struct device *dev, struct device_attribute *attr,
386                           char *buf)
387 {
388         int bitnr = to_sensor_dev_attr(attr)->index;
389         struct gl518_data *data = gl518_update_device(dev);
390         return sprintf(buf, "%u\n", (data->beep_mask >> bitnr) & 1);
391 }
392
393 static ssize_t set_beep(struct device *dev, struct device_attribute *attr,
394                         const char *buf, size_t count)
395 {
396         struct i2c_client *client = to_i2c_client(dev);
397         struct gl518_data *data = i2c_get_clientdata(client);
398         int bitnr = to_sensor_dev_attr(attr)->index;
399         unsigned long bit;
400
401         bit = simple_strtoul(buf, NULL, 10);
402         if (bit & ~1)
403                 return -EINVAL;
404
405         mutex_lock(&data->update_lock);
406         data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
407         if (bit)
408                 data->beep_mask |= (1 << bitnr);
409         else
410                 data->beep_mask &= ~(1 << bitnr);
411         gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
412         mutex_unlock(&data->update_lock);
413         return count;
414 }
415
416 static SENSOR_DEVICE_ATTR(in0_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 0);
417 static SENSOR_DEVICE_ATTR(in1_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 1);
418 static SENSOR_DEVICE_ATTR(in2_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 2);
419 static SENSOR_DEVICE_ATTR(in3_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 3);
420 static SENSOR_DEVICE_ATTR(temp1_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 4);
421 static SENSOR_DEVICE_ATTR(fan1_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 5);
422 static SENSOR_DEVICE_ATTR(fan2_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 6);
423
424 static struct attribute *gl518_attributes[] = {
425         &dev_attr_in3_input.attr,
426         &dev_attr_in0_min.attr,
427         &dev_attr_in1_min.attr,
428         &dev_attr_in2_min.attr,
429         &dev_attr_in3_min.attr,
430         &dev_attr_in0_max.attr,
431         &dev_attr_in1_max.attr,
432         &dev_attr_in2_max.attr,
433         &dev_attr_in3_max.attr,
434         &sensor_dev_attr_in0_alarm.dev_attr.attr,
435         &sensor_dev_attr_in1_alarm.dev_attr.attr,
436         &sensor_dev_attr_in2_alarm.dev_attr.attr,
437         &sensor_dev_attr_in3_alarm.dev_attr.attr,
438         &sensor_dev_attr_in0_beep.dev_attr.attr,
439         &sensor_dev_attr_in1_beep.dev_attr.attr,
440         &sensor_dev_attr_in2_beep.dev_attr.attr,
441         &sensor_dev_attr_in3_beep.dev_attr.attr,
442
443         &dev_attr_fan1_auto.attr,
444         &sensor_dev_attr_fan1_input.dev_attr.attr,
445         &sensor_dev_attr_fan2_input.dev_attr.attr,
446         &sensor_dev_attr_fan1_min.dev_attr.attr,
447         &sensor_dev_attr_fan2_min.dev_attr.attr,
448         &sensor_dev_attr_fan1_div.dev_attr.attr,
449         &sensor_dev_attr_fan2_div.dev_attr.attr,
450         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
451         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
452         &sensor_dev_attr_fan1_beep.dev_attr.attr,
453         &sensor_dev_attr_fan2_beep.dev_attr.attr,
454
455         &dev_attr_temp1_input.attr,
456         &dev_attr_temp1_max.attr,
457         &dev_attr_temp1_max_hyst.attr,
458         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
459         &sensor_dev_attr_temp1_beep.dev_attr.attr,
460
461         &dev_attr_alarms.attr,
462         &dev_attr_beep_enable.attr,
463         &dev_attr_beep_mask.attr,
464         NULL
465 };
466
467 static const struct attribute_group gl518_group = {
468         .attrs = gl518_attributes,
469 };
470
471 static struct attribute *gl518_attributes_r80[] = {
472         &dev_attr_in0_input.attr,
473         &dev_attr_in1_input.attr,
474         &dev_attr_in2_input.attr,
475         NULL
476 };
477
478 static const struct attribute_group gl518_group_r80 = {
479         .attrs = gl518_attributes_r80,
480 };
481
482 /*
483  * Real code
484  */
485
486 /* Return 0 if detection is successful, -ENODEV otherwise */
487 static int gl518_detect(struct i2c_client *client, int kind,
488                         struct i2c_board_info *info)
489 {
490         struct i2c_adapter *adapter = client->adapter;
491         int i;
492
493         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
494                                      I2C_FUNC_SMBUS_WORD_DATA))
495                 return -ENODEV;
496
497         /* Now, we do the remaining detection. */
498
499         if (kind < 0) {
500                 if ((gl518_read_value(client, GL518_REG_CHIP_ID) != 0x80)
501                  || (gl518_read_value(client, GL518_REG_CONF) & 0x80))
502                         return -ENODEV;
503         }
504
505         /* Determine the chip type. */
506         if (kind <= 0) {
507                 i = gl518_read_value(client, GL518_REG_REVISION);
508                 if (i == 0x00) {
509                         kind = gl518sm_r00;
510                 } else if (i == 0x80) {
511                         kind = gl518sm_r80;
512                 } else {
513                         if (kind <= 0)
514                                 dev_info(&adapter->dev,
515                                     "Ignoring 'force' parameter for unknown "
516                                     "chip at adapter %d, address 0x%02x\n",
517                                     i2c_adapter_id(adapter), client->addr);
518                         return -ENODEV;
519                 }
520         }
521
522         strlcpy(info->type, "gl518sm", I2C_NAME_SIZE);
523
524         return 0;
525 }
526
527 static int gl518_probe(struct i2c_client *client,
528                        const struct i2c_device_id *id)
529 {
530         struct gl518_data *data;
531         int err, revision;
532
533         data = kzalloc(sizeof(struct gl518_data), GFP_KERNEL);
534         if (!data) {
535                 err = -ENOMEM;
536                 goto exit;
537         }
538
539         i2c_set_clientdata(client, data);
540         revision = gl518_read_value(client, GL518_REG_REVISION);
541         data->type = revision == 0x80 ? gl518sm_r80 : gl518sm_r00;
542         mutex_init(&data->update_lock);
543
544         /* Initialize the GL518SM chip */
545         data->alarm_mask = 0xff;
546         gl518_init_client(client);
547
548         /* Register sysfs hooks */
549         if ((err = sysfs_create_group(&client->dev.kobj, &gl518_group)))
550                 goto exit_free;
551         if (data->type == gl518sm_r80)
552                 if ((err = sysfs_create_group(&client->dev.kobj,
553                                               &gl518_group_r80)))
554                         goto exit_remove_files;
555
556         data->hwmon_dev = hwmon_device_register(&client->dev);
557         if (IS_ERR(data->hwmon_dev)) {
558                 err = PTR_ERR(data->hwmon_dev);
559                 goto exit_remove_files;
560         }
561
562         return 0;
563
564 exit_remove_files:
565         sysfs_remove_group(&client->dev.kobj, &gl518_group);
566         if (data->type == gl518sm_r80)
567                 sysfs_remove_group(&client->dev.kobj, &gl518_group_r80);
568 exit_free:
569         kfree(data);
570 exit:
571         return err;
572 }
573
574
575 /* Called when we have found a new GL518SM.
576    Note that we preserve D4:NoFan2 and D2:beep_enable. */
577 static void gl518_init_client(struct i2c_client *client)
578 {
579         /* Make sure we leave D7:Reset untouched */
580         u8 regvalue = gl518_read_value(client, GL518_REG_CONF) & 0x7f;
581
582         /* Comparator mode (D3=0), standby mode (D6=0) */
583         gl518_write_value(client, GL518_REG_CONF, (regvalue &= 0x37));
584
585         /* Never interrupts */
586         gl518_write_value(client, GL518_REG_MASK, 0x00);
587
588         /* Clear status register (D5=1), start (D6=1) */
589         gl518_write_value(client, GL518_REG_CONF, 0x20 | regvalue);
590         gl518_write_value(client, GL518_REG_CONF, 0x40 | regvalue);
591 }
592
593 static int gl518_remove(struct i2c_client *client)
594 {
595         struct gl518_data *data = i2c_get_clientdata(client);
596
597         hwmon_device_unregister(data->hwmon_dev);
598         sysfs_remove_group(&client->dev.kobj, &gl518_group);
599         if (data->type == gl518sm_r80)
600                 sysfs_remove_group(&client->dev.kobj, &gl518_group_r80);
601
602         kfree(data);
603         return 0;
604 }
605
606 /* Registers 0x07 to 0x0c are word-sized, others are byte-sized
607    GL518 uses a high-byte first convention, which is exactly opposite to
608    the SMBus standard. */
609 static int gl518_read_value(struct i2c_client *client, u8 reg)
610 {
611         if ((reg >= 0x07) && (reg <= 0x0c))
612                 return swab16(i2c_smbus_read_word_data(client, reg));
613         else
614                 return i2c_smbus_read_byte_data(client, reg);
615 }
616
617 static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value)
618 {
619         if ((reg >= 0x07) && (reg <= 0x0c))
620                 return i2c_smbus_write_word_data(client, reg, swab16(value));
621         else
622                 return i2c_smbus_write_byte_data(client, reg, value);
623 }
624
625 static struct gl518_data *gl518_update_device(struct device *dev)
626 {
627         struct i2c_client *client = to_i2c_client(dev);
628         struct gl518_data *data = i2c_get_clientdata(client);
629         int val;
630
631         mutex_lock(&data->update_lock);
632
633         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
634             || !data->valid) {
635                 dev_dbg(&client->dev, "Starting gl518 update\n");
636
637                 data->alarms = gl518_read_value(client, GL518_REG_INT);
638                 data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
639
640                 val = gl518_read_value(client, GL518_REG_VDD_LIMIT);
641                 data->voltage_min[0] = val & 0xff;
642                 data->voltage_max[0] = (val >> 8) & 0xff;
643                 val = gl518_read_value(client, GL518_REG_VIN1_LIMIT);
644                 data->voltage_min[1] = val & 0xff;
645                 data->voltage_max[1] = (val >> 8) & 0xff;
646                 val = gl518_read_value(client, GL518_REG_VIN2_LIMIT);
647                 data->voltage_min[2] = val & 0xff;
648                 data->voltage_max[2] = (val >> 8) & 0xff;
649                 val = gl518_read_value(client, GL518_REG_VIN3_LIMIT);
650                 data->voltage_min[3] = val & 0xff;
651                 data->voltage_max[3] = (val >> 8) & 0xff;
652
653                 val = gl518_read_value(client, GL518_REG_FAN_COUNT);
654                 data->fan_in[0] = (val >> 8) & 0xff;
655                 data->fan_in[1] = val & 0xff;
656
657                 val = gl518_read_value(client, GL518_REG_FAN_LIMIT);
658                 data->fan_min[0] = (val >> 8) & 0xff;
659                 data->fan_min[1] = val & 0xff;
660
661                 data->temp_in = gl518_read_value(client, GL518_REG_TEMP_IN);
662                 data->temp_max =
663                     gl518_read_value(client, GL518_REG_TEMP_MAX);
664                 data->temp_hyst =
665                     gl518_read_value(client, GL518_REG_TEMP_HYST);
666
667                 val = gl518_read_value(client, GL518_REG_MISC);
668                 data->fan_div[0] = (val >> 6) & 0x03;
669                 data->fan_div[1] = (val >> 4) & 0x03;
670                 data->fan_auto1  = (val >> 3) & 0x01;
671
672                 data->alarms &= data->alarm_mask;
673
674                 val = gl518_read_value(client, GL518_REG_CONF);
675                 data->beep_enable = (val >> 2) & 1;
676
677                 if (data->type != gl518sm_r00) {
678                         data->voltage_in[0] =
679                             gl518_read_value(client, GL518_REG_VDD);
680                         data->voltage_in[1] =
681                             gl518_read_value(client, GL518_REG_VIN1);
682                         data->voltage_in[2] =
683                             gl518_read_value(client, GL518_REG_VIN2);
684                 }
685                 data->voltage_in[3] =
686                     gl518_read_value(client, GL518_REG_VIN3);
687
688                 data->last_updated = jiffies;
689                 data->valid = 1;
690         }
691
692         mutex_unlock(&data->update_lock);
693
694         return data;
695 }
696
697 static int __init sensors_gl518sm_init(void)
698 {
699         return i2c_add_driver(&gl518_driver);
700 }
701
702 static void __exit sensors_gl518sm_exit(void)
703 {
704         i2c_del_driver(&gl518_driver);
705 }
706
707 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
708         "Kyosti Malkki <kmalkki@cc.hut.fi> and "
709         "Hong-Gunn Chew <hglinux@gunnet.org>");
710 MODULE_DESCRIPTION("GL518SM driver");
711 MODULE_LICENSE("GPL");
712
713 module_init(sensors_gl518sm_init);
714 module_exit(sensors_gl518sm_exit);