9e685e3a3bc97ea911c10853e835f6b8f2de4422
[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  * History:
35  * 2004-01-28  Original port. (Hong-Gunn Chew)
36  * 2004-01-31  Code review and approval. (Jean Delvare)
37  */
38
39 #include <linux/module.h>
40 #include <linux/init.h>
41 #include <linux/slab.h>
42 #include <linux/jiffies.h>
43 #include <linux/i2c.h>
44 #include <linux/hwmon.h>
45 #include <linux/err.h>
46
47 /* Addresses to scan */
48 static unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };
49
50 /* Insmod parameters */
51 I2C_CLIENT_INSMOD_2(gl518sm_r00, gl518sm_r80);
52
53 /* Many GL518 constants specified below */
54
55 /* The GL518 registers */
56 #define GL518_REG_CHIP_ID       0x00
57 #define GL518_REG_REVISION      0x01
58 #define GL518_REG_VENDOR_ID     0x02
59 #define GL518_REG_CONF          0x03
60 #define GL518_REG_TEMP_IN       0x04
61 #define GL518_REG_TEMP_MAX      0x05
62 #define GL518_REG_TEMP_HYST     0x06
63 #define GL518_REG_FAN_COUNT     0x07
64 #define GL518_REG_FAN_LIMIT     0x08
65 #define GL518_REG_VIN1_LIMIT    0x09
66 #define GL518_REG_VIN2_LIMIT    0x0a
67 #define GL518_REG_VIN3_LIMIT    0x0b
68 #define GL518_REG_VDD_LIMIT     0x0c
69 #define GL518_REG_VIN3          0x0d
70 #define GL518_REG_MISC          0x0f
71 #define GL518_REG_ALARM         0x10
72 #define GL518_REG_MASK          0x11
73 #define GL518_REG_INT           0x12
74 #define GL518_REG_VIN2          0x13
75 #define GL518_REG_VIN1          0x14
76 #define GL518_REG_VDD           0x15
77
78
79 /*
80  * Conversions. Rounding and limit checking is only done on the TO_REG
81  * variants. Note that you should be a bit careful with which arguments
82  * these macros are called: arguments may be evaluated more than once.
83  * Fixing this is just not worth it.
84  */
85
86 #define RAW_FROM_REG(val)       val
87
88 #define BOOL_FROM_REG(val)      ((val)?0:1)
89 #define BOOL_TO_REG(val)        ((val)?0:1)
90
91 #define TEMP_TO_REG(val)        (SENSORS_LIMIT(((((val)<0? \
92                                 (val)-500:(val)+500)/1000)+119),0,255))
93 #define TEMP_FROM_REG(val)      (((val) - 119) * 1000)
94
95 static inline u8 FAN_TO_REG(long rpm, int div)
96 {
97         long rpmdiv;
98         if (rpm == 0)
99                 return 0;
100         rpmdiv = SENSORS_LIMIT(rpm, 1, 1920000) * div;
101         return SENSORS_LIMIT((960000 + rpmdiv / 2) / rpmdiv, 1, 255);
102 }
103 #define FAN_FROM_REG(val,div)   ((val)==0 ? 0 : (960000/((val)*(div))))
104
105 #define IN_TO_REG(val)          (SENSORS_LIMIT((((val)+9)/19),0,255))
106 #define IN_FROM_REG(val)        ((val)*19)
107
108 #define VDD_TO_REG(val)         (SENSORS_LIMIT((((val)*4+47)/95),0,255))
109 #define VDD_FROM_REG(val)       (((val)*95+2)/4)
110
111 #define DIV_TO_REG(val)         ((val)==4?2:(val)==2?1:(val)==1?0:3)
112 #define DIV_FROM_REG(val)       (1 << (val))
113
114 #define BEEP_MASK_TO_REG(val)   ((val) & 0x7f & data->alarm_mask)
115 #define BEEP_MASK_FROM_REG(val) ((val) & 0x7f)
116
117 /* Each client has this additional data */
118 struct gl518_data {
119         struct i2c_client client;
120         struct class_device *class_dev;
121         enum chips type;
122
123         struct semaphore update_lock;
124         char valid;             /* !=0 if following fields are valid */
125         unsigned long last_updated;     /* In jiffies */
126
127         u8 voltage_in[4];       /* Register values; [0] = VDD */
128         u8 voltage_min[4];      /* Register values; [0] = VDD */
129         u8 voltage_max[4];      /* Register values; [0] = VDD */
130         u8 iter_voltage_in[4];  /* Register values; [0] = VDD */
131         u8 fan_in[2];
132         u8 fan_min[2];
133         u8 fan_div[2];          /* Register encoding, shifted right */
134         u8 fan_auto1;           /* Boolean */
135         u8 temp_in;             /* Register values */
136         u8 temp_max;            /* Register values */
137         u8 temp_hyst;           /* Register values */
138         u8 alarms;              /* Register value */
139         u8 alarm_mask;          /* Register value */
140         u8 beep_mask;           /* Register value */
141         u8 beep_enable;         /* Boolean */
142 };
143
144 static int gl518_attach_adapter(struct i2c_adapter *adapter);
145 static int gl518_detect(struct i2c_adapter *adapter, int address, int kind);
146 static void gl518_init_client(struct i2c_client *client);
147 static int gl518_detach_client(struct i2c_client *client);
148 static int gl518_read_value(struct i2c_client *client, u8 reg);
149 static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value);
150 static struct gl518_data *gl518_update_device(struct device *dev);
151
152 /* This is the driver that will be inserted */
153 static struct i2c_driver gl518_driver = {
154         .driver = {
155                 .name   = "gl518sm",
156         },
157         .id             = I2C_DRIVERID_GL518,
158         .attach_adapter = gl518_attach_adapter,
159         .detach_client  = gl518_detach_client,
160 };
161
162 /*
163  * Sysfs stuff
164  */
165
166 #define show(type, suffix, value)                                       \
167 static ssize_t show_##suffix(struct device *dev, struct device_attribute *attr, char *buf)              \
168 {                                                                       \
169         struct gl518_data *data = gl518_update_device(dev);             \
170         return sprintf(buf, "%d\n", type##_FROM_REG(data->value));      \
171 }
172
173 #define show_fan(suffix, value, index)                                  \
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", FAN_FROM_REG(data->value[index],    \
178                 DIV_FROM_REG(data->fan_div[index])));                   \
179 }
180
181 show(TEMP, temp_input1, temp_in);
182 show(TEMP, temp_max1, temp_max);
183 show(TEMP, temp_hyst1, temp_hyst);
184 show(BOOL, fan_auto1, fan_auto1);
185 show_fan(fan_input1, fan_in, 0);
186 show_fan(fan_input2, fan_in, 1);
187 show_fan(fan_min1, fan_min, 0);
188 show_fan(fan_min2, fan_min, 1);
189 show(DIV, fan_div1, fan_div[0]);
190 show(DIV, fan_div2, fan_div[1]);
191 show(VDD, in_input0, voltage_in[0]);
192 show(IN, in_input1, voltage_in[1]);
193 show(IN, in_input2, voltage_in[2]);
194 show(IN, in_input3, voltage_in[3]);
195 show(VDD, in_min0, voltage_min[0]);
196 show(IN, in_min1, voltage_min[1]);
197 show(IN, in_min2, voltage_min[2]);
198 show(IN, in_min3, voltage_min[3]);
199 show(VDD, in_max0, voltage_max[0]);
200 show(IN, in_max1, voltage_max[1]);
201 show(IN, in_max2, voltage_max[2]);
202 show(IN, in_max3, voltage_max[3]);
203 show(RAW, alarms, alarms);
204 show(BOOL, beep_enable, beep_enable);
205 show(BEEP_MASK, beep_mask, beep_mask);
206
207 #define set(type, suffix, value, reg)                                   \
208 static ssize_t set_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
209         size_t count)                                                   \
210 {                                                                       \
211         struct i2c_client *client = to_i2c_client(dev);                 \
212         struct gl518_data *data = i2c_get_clientdata(client);           \
213         long val = simple_strtol(buf, NULL, 10);                        \
214                                                                         \
215         down(&data->update_lock);                                       \
216         data->value = type##_TO_REG(val);                               \
217         gl518_write_value(client, reg, data->value);                    \
218         up(&data->update_lock);                                         \
219         return count;                                                   \
220 }
221
222 #define set_bits(type, suffix, value, reg, mask, shift)                 \
223 static ssize_t set_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
224         size_t count)                                                   \
225 {                                                                       \
226         struct i2c_client *client = to_i2c_client(dev);                 \
227         struct gl518_data *data = i2c_get_clientdata(client);           \
228         int regvalue;                                                   \
229         unsigned long val = simple_strtoul(buf, NULL, 10);              \
230                                                                         \
231         down(&data->update_lock);                                       \
232         regvalue = gl518_read_value(client, reg);                       \
233         data->value = type##_TO_REG(val);                               \
234         regvalue = (regvalue & ~mask) | (data->value << shift);         \
235         gl518_write_value(client, reg, regvalue);                       \
236         up(&data->update_lock);                                         \
237         return count;                                                   \
238 }
239
240 #define set_low(type, suffix, value, reg)                               \
241         set_bits(type, suffix, value, reg, 0x00ff, 0)
242 #define set_high(type, suffix, value, reg)                              \
243         set_bits(type, suffix, value, reg, 0xff00, 8)
244
245 set(TEMP, temp_max1, temp_max, GL518_REG_TEMP_MAX);
246 set(TEMP, temp_hyst1, temp_hyst, GL518_REG_TEMP_HYST);
247 set_bits(BOOL, fan_auto1, fan_auto1, GL518_REG_MISC, 0x08, 3);
248 set_bits(DIV, fan_div1, fan_div[0], GL518_REG_MISC, 0xc0, 6);
249 set_bits(DIV, fan_div2, fan_div[1], GL518_REG_MISC, 0x30, 4);
250 set_low(VDD, in_min0, voltage_min[0], GL518_REG_VDD_LIMIT);
251 set_low(IN, in_min1, voltage_min[1], GL518_REG_VIN1_LIMIT);
252 set_low(IN, in_min2, voltage_min[2], GL518_REG_VIN2_LIMIT);
253 set_low(IN, in_min3, voltage_min[3], GL518_REG_VIN3_LIMIT);
254 set_high(VDD, in_max0, voltage_max[0], GL518_REG_VDD_LIMIT);
255 set_high(IN, in_max1, voltage_max[1], GL518_REG_VIN1_LIMIT);
256 set_high(IN, in_max2, voltage_max[2], GL518_REG_VIN2_LIMIT);
257 set_high(IN, in_max3, voltage_max[3], GL518_REG_VIN3_LIMIT);
258 set_bits(BOOL, beep_enable, beep_enable, GL518_REG_CONF, 0x04, 2);
259 set(BEEP_MASK, beep_mask, beep_mask, GL518_REG_ALARM);
260
261 static ssize_t set_fan_min1(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
262 {
263         struct i2c_client *client = to_i2c_client(dev);
264         struct gl518_data *data = i2c_get_clientdata(client);
265         int regvalue;
266         unsigned long val = simple_strtoul(buf, NULL, 10);
267
268         down(&data->update_lock);
269         regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
270         data->fan_min[0] = FAN_TO_REG(val,
271                 DIV_FROM_REG(data->fan_div[0]));
272         regvalue = (regvalue & 0x00ff) | (data->fan_min[0] << 8);
273         gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);
274
275         data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
276         if (data->fan_min[0] == 0)
277                 data->alarm_mask &= ~0x20;
278         else
279                 data->alarm_mask |= 0x20;
280         data->beep_mask &= data->alarm_mask;
281         gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
282
283         up(&data->update_lock);
284         return count;
285 }
286
287 static ssize_t set_fan_min2(struct device *dev, struct device_attribute *attr, 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 regvalue;
292         unsigned long val = simple_strtoul(buf, NULL, 10);
293
294         down(&data->update_lock);
295         regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
296         data->fan_min[1] = FAN_TO_REG(val,
297                 DIV_FROM_REG(data->fan_div[1]));
298         regvalue = (regvalue & 0xff00) | data->fan_min[1];
299         gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);
300
301         data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
302         if (data->fan_min[1] == 0)
303                 data->alarm_mask &= ~0x40;
304         else
305                 data->alarm_mask |= 0x40;
306         data->beep_mask &= data->alarm_mask;
307         gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
308
309         up(&data->update_lock);
310         return count;
311 }
312
313 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
314 static DEVICE_ATTR(temp1_max, S_IWUSR|S_IRUGO, show_temp_max1, set_temp_max1);
315 static DEVICE_ATTR(temp1_max_hyst, S_IWUSR|S_IRUGO,
316         show_temp_hyst1, set_temp_hyst1);
317 static DEVICE_ATTR(fan1_auto, S_IWUSR|S_IRUGO, show_fan_auto1, set_fan_auto1);
318 static DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input1, NULL);
319 static DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input2, NULL);
320 static DEVICE_ATTR(fan1_min, S_IWUSR|S_IRUGO, show_fan_min1, set_fan_min1);
321 static DEVICE_ATTR(fan2_min, S_IWUSR|S_IRUGO, show_fan_min2, set_fan_min2);
322 static DEVICE_ATTR(fan1_div, S_IWUSR|S_IRUGO, show_fan_div1, set_fan_div1);
323 static DEVICE_ATTR(fan2_div, S_IWUSR|S_IRUGO, show_fan_div2, set_fan_div2);
324 static DEVICE_ATTR(in0_input, S_IRUGO, show_in_input0, NULL);
325 static DEVICE_ATTR(in1_input, S_IRUGO, show_in_input1, NULL);
326 static DEVICE_ATTR(in2_input, S_IRUGO, show_in_input2, NULL);
327 static DEVICE_ATTR(in3_input, S_IRUGO, show_in_input3, NULL);
328 static DEVICE_ATTR(in0_min, S_IWUSR|S_IRUGO, show_in_min0, set_in_min0);
329 static DEVICE_ATTR(in1_min, S_IWUSR|S_IRUGO, show_in_min1, set_in_min1);
330 static DEVICE_ATTR(in2_min, S_IWUSR|S_IRUGO, show_in_min2, set_in_min2);
331 static DEVICE_ATTR(in3_min, S_IWUSR|S_IRUGO, show_in_min3, set_in_min3);
332 static DEVICE_ATTR(in0_max, S_IWUSR|S_IRUGO, show_in_max0, set_in_max0);
333 static DEVICE_ATTR(in1_max, S_IWUSR|S_IRUGO, show_in_max1, set_in_max1);
334 static DEVICE_ATTR(in2_max, S_IWUSR|S_IRUGO, show_in_max2, set_in_max2);
335 static DEVICE_ATTR(in3_max, S_IWUSR|S_IRUGO, show_in_max3, set_in_max3);
336 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
337 static DEVICE_ATTR(beep_enable, S_IWUSR|S_IRUGO,
338         show_beep_enable, set_beep_enable);
339 static DEVICE_ATTR(beep_mask, S_IWUSR|S_IRUGO,
340         show_beep_mask, set_beep_mask);
341
342 /*
343  * Real code
344  */
345
346 static int gl518_attach_adapter(struct i2c_adapter *adapter)
347 {
348         if (!(adapter->class & I2C_CLASS_HWMON))
349                 return 0;
350         return i2c_probe(adapter, &addr_data, gl518_detect);
351 }
352
353 static int gl518_detect(struct i2c_adapter *adapter, int address, int kind)
354 {
355         int i;
356         struct i2c_client *new_client;
357         struct gl518_data *data;
358         int err = 0;
359
360         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
361                                      I2C_FUNC_SMBUS_WORD_DATA))
362                 goto exit;
363
364         /* OK. For now, we presume we have a valid client. We now create the
365            client structure, even though we cannot fill it completely yet.
366            But it allows us to access gl518_{read,write}_value. */
367
368         if (!(data = kzalloc(sizeof(struct gl518_data), GFP_KERNEL))) {
369                 err = -ENOMEM;
370                 goto exit;
371         }
372
373         new_client = &data->client;
374         i2c_set_clientdata(new_client, data);
375
376         new_client->addr = address;
377         new_client->adapter = adapter;
378         new_client->driver = &gl518_driver;
379         new_client->flags = 0;
380
381         /* Now, we do the remaining detection. */
382
383         if (kind < 0) {
384                 if ((gl518_read_value(new_client, GL518_REG_CHIP_ID) != 0x80)
385                  || (gl518_read_value(new_client, GL518_REG_CONF) & 0x80))
386                         goto exit_free;
387         }
388
389         /* Determine the chip type. */
390         if (kind <= 0) {
391                 i = gl518_read_value(new_client, GL518_REG_REVISION);
392                 if (i == 0x00) {
393                         kind = gl518sm_r00;
394                 } else if (i == 0x80) {
395                         kind = gl518sm_r80;
396                 } else {
397                         if (kind <= 0)
398                                 dev_info(&adapter->dev,
399                                     "Ignoring 'force' parameter for unknown "
400                                     "chip at adapter %d, address 0x%02x\n",
401                                     i2c_adapter_id(adapter), address);
402                         goto exit_free;
403                 }
404         }
405
406         /* Fill in the remaining client fields */
407         strlcpy(new_client->name, "gl518sm", I2C_NAME_SIZE);
408         data->type = kind;
409         data->valid = 0;
410         init_MUTEX(&data->update_lock);
411
412         /* Tell the I2C layer a new client has arrived */
413         if ((err = i2c_attach_client(new_client)))
414                 goto exit_free;
415
416         /* Initialize the GL518SM chip */
417         data->alarm_mask = 0xff;
418         data->voltage_in[0]=data->voltage_in[1]=data->voltage_in[2]=0;
419         gl518_init_client((struct i2c_client *) new_client);
420
421         /* Register sysfs hooks */
422         data->class_dev = hwmon_device_register(&new_client->dev);
423         if (IS_ERR(data->class_dev)) {
424                 err = PTR_ERR(data->class_dev);
425                 goto exit_detach;
426         }
427
428         device_create_file(&new_client->dev, &dev_attr_in0_input);
429         device_create_file(&new_client->dev, &dev_attr_in1_input);
430         device_create_file(&new_client->dev, &dev_attr_in2_input);
431         device_create_file(&new_client->dev, &dev_attr_in3_input);
432         device_create_file(&new_client->dev, &dev_attr_in0_min);
433         device_create_file(&new_client->dev, &dev_attr_in1_min);
434         device_create_file(&new_client->dev, &dev_attr_in2_min);
435         device_create_file(&new_client->dev, &dev_attr_in3_min);
436         device_create_file(&new_client->dev, &dev_attr_in0_max);
437         device_create_file(&new_client->dev, &dev_attr_in1_max);
438         device_create_file(&new_client->dev, &dev_attr_in2_max);
439         device_create_file(&new_client->dev, &dev_attr_in3_max);
440         device_create_file(&new_client->dev, &dev_attr_fan1_auto);
441         device_create_file(&new_client->dev, &dev_attr_fan1_input);
442         device_create_file(&new_client->dev, &dev_attr_fan2_input);
443         device_create_file(&new_client->dev, &dev_attr_fan1_min);
444         device_create_file(&new_client->dev, &dev_attr_fan2_min);
445         device_create_file(&new_client->dev, &dev_attr_fan1_div);
446         device_create_file(&new_client->dev, &dev_attr_fan2_div);
447         device_create_file(&new_client->dev, &dev_attr_temp1_input);
448         device_create_file(&new_client->dev, &dev_attr_temp1_max);
449         device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
450         device_create_file(&new_client->dev, &dev_attr_alarms);
451         device_create_file(&new_client->dev, &dev_attr_beep_enable);
452         device_create_file(&new_client->dev, &dev_attr_beep_mask);
453
454         return 0;
455
456 /* OK, this is not exactly good programming practice, usually. But it is
457    very code-efficient in this case. */
458
459 exit_detach:
460         i2c_detach_client(new_client);
461 exit_free:
462         kfree(data);
463 exit:
464         return err;
465 }
466
467
468 /* Called when we have found a new GL518SM.
469    Note that we preserve D4:NoFan2 and D2:beep_enable. */
470 static void gl518_init_client(struct i2c_client *client)
471 {
472         /* Make sure we leave D7:Reset untouched */
473         u8 regvalue = gl518_read_value(client, GL518_REG_CONF) & 0x7f;
474
475         /* Comparator mode (D3=0), standby mode (D6=0) */
476         gl518_write_value(client, GL518_REG_CONF, (regvalue &= 0x37));
477
478         /* Never interrupts */
479         gl518_write_value(client, GL518_REG_MASK, 0x00);
480
481         /* Clear status register (D5=1), start (D6=1) */
482         gl518_write_value(client, GL518_REG_CONF, 0x20 | regvalue);
483         gl518_write_value(client, GL518_REG_CONF, 0x40 | regvalue);
484 }
485
486 static int gl518_detach_client(struct i2c_client *client)
487 {
488         struct gl518_data *data = i2c_get_clientdata(client);
489         int err;
490
491         hwmon_device_unregister(data->class_dev);
492
493         if ((err = i2c_detach_client(client)))
494                 return err;
495
496         kfree(data);
497         return 0;
498 }
499
500 /* Registers 0x07 to 0x0c are word-sized, others are byte-sized 
501    GL518 uses a high-byte first convention, which is exactly opposite to
502    the usual practice. */
503 static int gl518_read_value(struct i2c_client *client, u8 reg)
504 {
505         if ((reg >= 0x07) && (reg <= 0x0c))
506                 return swab16(i2c_smbus_read_word_data(client, reg));
507         else
508                 return i2c_smbus_read_byte_data(client, reg);
509 }
510
511 /* Registers 0x07 to 0x0c are word-sized, others are byte-sized 
512    GL518 uses a high-byte first convention, which is exactly opposite to
513    the usual practice. */
514 static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value)
515 {
516         if ((reg >= 0x07) && (reg <= 0x0c))
517                 return i2c_smbus_write_word_data(client, reg, swab16(value));
518         else
519                 return i2c_smbus_write_byte_data(client, reg, value);
520 }
521
522 static struct gl518_data *gl518_update_device(struct device *dev)
523 {
524         struct i2c_client *client = to_i2c_client(dev);
525         struct gl518_data *data = i2c_get_clientdata(client);
526         int val;
527
528         down(&data->update_lock);
529
530         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
531             || !data->valid) {
532                 dev_dbg(&client->dev, "Starting gl518 update\n");
533
534                 data->alarms = gl518_read_value(client, GL518_REG_INT);
535                 data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
536
537                 val = gl518_read_value(client, GL518_REG_VDD_LIMIT);
538                 data->voltage_min[0] = val & 0xff;
539                 data->voltage_max[0] = (val >> 8) & 0xff;
540                 val = gl518_read_value(client, GL518_REG_VIN1_LIMIT);
541                 data->voltage_min[1] = val & 0xff;
542                 data->voltage_max[1] = (val >> 8) & 0xff;
543                 val = gl518_read_value(client, GL518_REG_VIN2_LIMIT);
544                 data->voltage_min[2] = val & 0xff;
545                 data->voltage_max[2] = (val >> 8) & 0xff;
546                 val = gl518_read_value(client, GL518_REG_VIN3_LIMIT);
547                 data->voltage_min[3] = val & 0xff;
548                 data->voltage_max[3] = (val >> 8) & 0xff;
549
550                 val = gl518_read_value(client, GL518_REG_FAN_COUNT);
551                 data->fan_in[0] = (val >> 8) & 0xff;
552                 data->fan_in[1] = val & 0xff;
553
554                 val = gl518_read_value(client, GL518_REG_FAN_LIMIT);
555                 data->fan_min[0] = (val >> 8) & 0xff;
556                 data->fan_min[1] = val & 0xff;
557
558                 data->temp_in = gl518_read_value(client, GL518_REG_TEMP_IN);
559                 data->temp_max =
560                     gl518_read_value(client, GL518_REG_TEMP_MAX);
561                 data->temp_hyst =
562                     gl518_read_value(client, GL518_REG_TEMP_HYST);
563
564                 val = gl518_read_value(client, GL518_REG_MISC);
565                 data->fan_div[0] = (val >> 6) & 0x03;
566                 data->fan_div[1] = (val >> 4) & 0x03;
567                 data->fan_auto1  = (val >> 3) & 0x01;
568
569                 data->alarms &= data->alarm_mask;
570
571                 val = gl518_read_value(client, GL518_REG_CONF);
572                 data->beep_enable = (val >> 2) & 1;
573
574                 if (data->type != gl518sm_r00) {
575                         data->voltage_in[0] =
576                             gl518_read_value(client, GL518_REG_VDD);
577                         data->voltage_in[1] =
578                             gl518_read_value(client, GL518_REG_VIN1);
579                         data->voltage_in[2] =
580                             gl518_read_value(client, GL518_REG_VIN2);
581                 }
582                 data->voltage_in[3] =
583                     gl518_read_value(client, GL518_REG_VIN3);
584
585                 data->last_updated = jiffies;
586                 data->valid = 1;
587         }
588
589         up(&data->update_lock);
590
591         return data;
592 }
593
594 static int __init sensors_gl518sm_init(void)
595 {
596         return i2c_add_driver(&gl518_driver);
597 }
598
599 static void __exit sensors_gl518sm_exit(void)
600 {
601         i2c_del_driver(&gl518_driver);
602 }
603
604 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
605         "Kyosti Malkki <kmalkki@cc.hut.fi> and "
606         "Hong-Gunn Chew <hglinux@gunnet.org>");
607 MODULE_DESCRIPTION("GL518SM driver");
608 MODULE_LICENSE("GPL");
609
610 module_init(sensors_gl518sm_init);
611 module_exit(sensors_gl518sm_exit);