[PATCH] i2c: Drop i2c_driver.flags, 2 of 3
[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         .owner          = THIS_MODULE,
155         .name           = "gl518sm",
156         .id             = I2C_DRIVERID_GL518,
157         .attach_adapter = gl518_attach_adapter,
158         .detach_client  = gl518_detach_client,
159 };
160
161 /*
162  * Sysfs stuff
163  */
164
165 #define show(type, suffix, value)                                       \
166 static ssize_t show_##suffix(struct device *dev, struct device_attribute *attr, char *buf)              \
167 {                                                                       \
168         struct gl518_data *data = gl518_update_device(dev);             \
169         return sprintf(buf, "%d\n", type##_FROM_REG(data->value));      \
170 }
171
172 #define show_fan(suffix, value, index)                                  \
173 static ssize_t show_##suffix(struct device *dev, struct device_attribute *attr, char *buf)              \
174 {                                                                       \
175         struct gl518_data *data = gl518_update_device(dev);             \
176         return sprintf(buf, "%d\n", FAN_FROM_REG(data->value[index],    \
177                 DIV_FROM_REG(data->fan_div[index])));                   \
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_fan(fan_input1, fan_in, 0);
185 show_fan(fan_input2, fan_in, 1);
186 show_fan(fan_min1, fan_min, 0);
187 show_fan(fan_min2, fan_min, 1);
188 show(DIV, fan_div1, fan_div[0]);
189 show(DIV, fan_div2, fan_div[1]);
190 show(VDD, in_input0, voltage_in[0]);
191 show(IN, in_input1, voltage_in[1]);
192 show(IN, in_input2, voltage_in[2]);
193 show(IN, in_input3, voltage_in[3]);
194 show(VDD, in_min0, voltage_min[0]);
195 show(IN, in_min1, voltage_min[1]);
196 show(IN, in_min2, voltage_min[2]);
197 show(IN, in_min3, voltage_min[3]);
198 show(VDD, in_max0, voltage_max[0]);
199 show(IN, in_max1, voltage_max[1]);
200 show(IN, in_max2, voltage_max[2]);
201 show(IN, in_max3, voltage_max[3]);
202 show(RAW, alarms, alarms);
203 show(BOOL, beep_enable, beep_enable);
204 show(BEEP_MASK, beep_mask, beep_mask);
205
206 #define set(type, suffix, value, reg)                                   \
207 static ssize_t set_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
208         size_t count)                                                   \
209 {                                                                       \
210         struct i2c_client *client = to_i2c_client(dev);                 \
211         struct gl518_data *data = i2c_get_clientdata(client);           \
212         long val = simple_strtol(buf, NULL, 10);                        \
213                                                                         \
214         down(&data->update_lock);                                       \
215         data->value = type##_TO_REG(val);                               \
216         gl518_write_value(client, reg, data->value);                    \
217         up(&data->update_lock);                                         \
218         return count;                                                   \
219 }
220
221 #define set_bits(type, suffix, value, reg, mask, shift)                 \
222 static ssize_t set_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
223         size_t count)                                                   \
224 {                                                                       \
225         struct i2c_client *client = to_i2c_client(dev);                 \
226         struct gl518_data *data = i2c_get_clientdata(client);           \
227         int regvalue;                                                   \
228         unsigned long val = simple_strtoul(buf, NULL, 10);              \
229                                                                         \
230         down(&data->update_lock);                                       \
231         regvalue = gl518_read_value(client, reg);                       \
232         data->value = type##_TO_REG(val);                               \
233         regvalue = (regvalue & ~mask) | (data->value << shift);         \
234         gl518_write_value(client, reg, regvalue);                       \
235         up(&data->update_lock);                                         \
236         return count;                                                   \
237 }
238
239 #define set_low(type, suffix, value, reg)                               \
240         set_bits(type, suffix, value, reg, 0x00ff, 0)
241 #define set_high(type, suffix, value, reg)                              \
242         set_bits(type, suffix, value, reg, 0xff00, 8)
243
244 set(TEMP, temp_max1, temp_max, GL518_REG_TEMP_MAX);
245 set(TEMP, temp_hyst1, temp_hyst, GL518_REG_TEMP_HYST);
246 set_bits(BOOL, fan_auto1, fan_auto1, GL518_REG_MISC, 0x08, 3);
247 set_bits(DIV, fan_div1, fan_div[0], GL518_REG_MISC, 0xc0, 6);
248 set_bits(DIV, fan_div2, fan_div[1], GL518_REG_MISC, 0x30, 4);
249 set_low(VDD, in_min0, voltage_min[0], GL518_REG_VDD_LIMIT);
250 set_low(IN, in_min1, voltage_min[1], GL518_REG_VIN1_LIMIT);
251 set_low(IN, in_min2, voltage_min[2], GL518_REG_VIN2_LIMIT);
252 set_low(IN, in_min3, voltage_min[3], GL518_REG_VIN3_LIMIT);
253 set_high(VDD, in_max0, voltage_max[0], GL518_REG_VDD_LIMIT);
254 set_high(IN, in_max1, voltage_max[1], GL518_REG_VIN1_LIMIT);
255 set_high(IN, in_max2, voltage_max[2], GL518_REG_VIN2_LIMIT);
256 set_high(IN, in_max3, voltage_max[3], GL518_REG_VIN3_LIMIT);
257 set_bits(BOOL, beep_enable, beep_enable, GL518_REG_CONF, 0x04, 2);
258 set(BEEP_MASK, beep_mask, beep_mask, GL518_REG_ALARM);
259
260 static ssize_t set_fan_min1(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
261 {
262         struct i2c_client *client = to_i2c_client(dev);
263         struct gl518_data *data = i2c_get_clientdata(client);
264         int regvalue;
265         unsigned long val = simple_strtoul(buf, NULL, 10);
266
267         down(&data->update_lock);
268         regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
269         data->fan_min[0] = FAN_TO_REG(val,
270                 DIV_FROM_REG(data->fan_div[0]));
271         regvalue = (regvalue & 0x00ff) | (data->fan_min[0] << 8);
272         gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);
273
274         data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
275         if (data->fan_min[0] == 0)
276                 data->alarm_mask &= ~0x20;
277         else
278                 data->alarm_mask |= 0x20;
279         data->beep_mask &= data->alarm_mask;
280         gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
281
282         up(&data->update_lock);
283         return count;
284 }
285
286 static ssize_t set_fan_min2(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
287 {
288         struct i2c_client *client = to_i2c_client(dev);
289         struct gl518_data *data = i2c_get_clientdata(client);
290         int regvalue;
291         unsigned long val = simple_strtoul(buf, NULL, 10);
292
293         down(&data->update_lock);
294         regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
295         data->fan_min[1] = FAN_TO_REG(val,
296                 DIV_FROM_REG(data->fan_div[1]));
297         regvalue = (regvalue & 0xff00) | data->fan_min[1];
298         gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);
299
300         data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
301         if (data->fan_min[1] == 0)
302                 data->alarm_mask &= ~0x40;
303         else
304                 data->alarm_mask |= 0x40;
305         data->beep_mask &= data->alarm_mask;
306         gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
307
308         up(&data->update_lock);
309         return count;
310 }
311
312 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
313 static DEVICE_ATTR(temp1_max, S_IWUSR|S_IRUGO, show_temp_max1, set_temp_max1);
314 static DEVICE_ATTR(temp1_max_hyst, S_IWUSR|S_IRUGO,
315         show_temp_hyst1, set_temp_hyst1);
316 static DEVICE_ATTR(fan1_auto, S_IWUSR|S_IRUGO, show_fan_auto1, set_fan_auto1);
317 static DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input1, NULL);
318 static DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input2, NULL);
319 static DEVICE_ATTR(fan1_min, S_IWUSR|S_IRUGO, show_fan_min1, set_fan_min1);
320 static DEVICE_ATTR(fan2_min, S_IWUSR|S_IRUGO, show_fan_min2, set_fan_min2);
321 static DEVICE_ATTR(fan1_div, S_IWUSR|S_IRUGO, show_fan_div1, set_fan_div1);
322 static DEVICE_ATTR(fan2_div, S_IWUSR|S_IRUGO, show_fan_div2, set_fan_div2);
323 static DEVICE_ATTR(in0_input, S_IRUGO, show_in_input0, NULL);
324 static DEVICE_ATTR(in1_input, S_IRUGO, show_in_input1, NULL);
325 static DEVICE_ATTR(in2_input, S_IRUGO, show_in_input2, NULL);
326 static DEVICE_ATTR(in3_input, S_IRUGO, show_in_input3, NULL);
327 static DEVICE_ATTR(in0_min, S_IWUSR|S_IRUGO, show_in_min0, set_in_min0);
328 static DEVICE_ATTR(in1_min, S_IWUSR|S_IRUGO, show_in_min1, set_in_min1);
329 static DEVICE_ATTR(in2_min, S_IWUSR|S_IRUGO, show_in_min2, set_in_min2);
330 static DEVICE_ATTR(in3_min, S_IWUSR|S_IRUGO, show_in_min3, set_in_min3);
331 static DEVICE_ATTR(in0_max, S_IWUSR|S_IRUGO, show_in_max0, set_in_max0);
332 static DEVICE_ATTR(in1_max, S_IWUSR|S_IRUGO, show_in_max1, set_in_max1);
333 static DEVICE_ATTR(in2_max, S_IWUSR|S_IRUGO, show_in_max2, set_in_max2);
334 static DEVICE_ATTR(in3_max, S_IWUSR|S_IRUGO, show_in_max3, set_in_max3);
335 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
336 static DEVICE_ATTR(beep_enable, S_IWUSR|S_IRUGO,
337         show_beep_enable, set_beep_enable);
338 static DEVICE_ATTR(beep_mask, S_IWUSR|S_IRUGO,
339         show_beep_mask, set_beep_mask);
340
341 /*
342  * Real code
343  */
344
345 static int gl518_attach_adapter(struct i2c_adapter *adapter)
346 {
347         if (!(adapter->class & I2C_CLASS_HWMON))
348                 return 0;
349         return i2c_probe(adapter, &addr_data, gl518_detect);
350 }
351
352 static int gl518_detect(struct i2c_adapter *adapter, int address, int kind)
353 {
354         int i;
355         struct i2c_client *new_client;
356         struct gl518_data *data;
357         int err = 0;
358
359         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
360                                      I2C_FUNC_SMBUS_WORD_DATA))
361                 goto exit;
362
363         /* OK. For now, we presume we have a valid client. We now create the
364            client structure, even though we cannot fill it completely yet.
365            But it allows us to access gl518_{read,write}_value. */
366
367         if (!(data = kzalloc(sizeof(struct gl518_data), GFP_KERNEL))) {
368                 err = -ENOMEM;
369                 goto exit;
370         }
371
372         new_client = &data->client;
373         i2c_set_clientdata(new_client, data);
374
375         new_client->addr = address;
376         new_client->adapter = adapter;
377         new_client->driver = &gl518_driver;
378         new_client->flags = 0;
379
380         /* Now, we do the remaining detection. */
381
382         if (kind < 0) {
383                 if ((gl518_read_value(new_client, GL518_REG_CHIP_ID) != 0x80)
384                  || (gl518_read_value(new_client, GL518_REG_CONF) & 0x80))
385                         goto exit_free;
386         }
387
388         /* Determine the chip type. */
389         if (kind <= 0) {
390                 i = gl518_read_value(new_client, GL518_REG_REVISION);
391                 if (i == 0x00) {
392                         kind = gl518sm_r00;
393                 } else if (i == 0x80) {
394                         kind = gl518sm_r80;
395                 } else {
396                         if (kind <= 0)
397                                 dev_info(&adapter->dev,
398                                     "Ignoring 'force' parameter for unknown "
399                                     "chip at adapter %d, address 0x%02x\n",
400                                     i2c_adapter_id(adapter), address);
401                         goto exit_free;
402                 }
403         }
404
405         /* Fill in the remaining client fields */
406         strlcpy(new_client->name, "gl518sm", I2C_NAME_SIZE);
407         data->type = kind;
408         data->valid = 0;
409         init_MUTEX(&data->update_lock);
410
411         /* Tell the I2C layer a new client has arrived */
412         if ((err = i2c_attach_client(new_client)))
413                 goto exit_free;
414
415         /* Initialize the GL518SM chip */
416         data->alarm_mask = 0xff;
417         data->voltage_in[0]=data->voltage_in[1]=data->voltage_in[2]=0;
418         gl518_init_client((struct i2c_client *) new_client);
419
420         /* Register sysfs hooks */
421         data->class_dev = hwmon_device_register(&new_client->dev);
422         if (IS_ERR(data->class_dev)) {
423                 err = PTR_ERR(data->class_dev);
424                 goto exit_detach;
425         }
426
427         device_create_file(&new_client->dev, &dev_attr_in0_input);
428         device_create_file(&new_client->dev, &dev_attr_in1_input);
429         device_create_file(&new_client->dev, &dev_attr_in2_input);
430         device_create_file(&new_client->dev, &dev_attr_in3_input);
431         device_create_file(&new_client->dev, &dev_attr_in0_min);
432         device_create_file(&new_client->dev, &dev_attr_in1_min);
433         device_create_file(&new_client->dev, &dev_attr_in2_min);
434         device_create_file(&new_client->dev, &dev_attr_in3_min);
435         device_create_file(&new_client->dev, &dev_attr_in0_max);
436         device_create_file(&new_client->dev, &dev_attr_in1_max);
437         device_create_file(&new_client->dev, &dev_attr_in2_max);
438         device_create_file(&new_client->dev, &dev_attr_in3_max);
439         device_create_file(&new_client->dev, &dev_attr_fan1_auto);
440         device_create_file(&new_client->dev, &dev_attr_fan1_input);
441         device_create_file(&new_client->dev, &dev_attr_fan2_input);
442         device_create_file(&new_client->dev, &dev_attr_fan1_min);
443         device_create_file(&new_client->dev, &dev_attr_fan2_min);
444         device_create_file(&new_client->dev, &dev_attr_fan1_div);
445         device_create_file(&new_client->dev, &dev_attr_fan2_div);
446         device_create_file(&new_client->dev, &dev_attr_temp1_input);
447         device_create_file(&new_client->dev, &dev_attr_temp1_max);
448         device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
449         device_create_file(&new_client->dev, &dev_attr_alarms);
450         device_create_file(&new_client->dev, &dev_attr_beep_enable);
451         device_create_file(&new_client->dev, &dev_attr_beep_mask);
452
453         return 0;
454
455 /* OK, this is not exactly good programming practice, usually. But it is
456    very code-efficient in this case. */
457
458 exit_detach:
459         i2c_detach_client(new_client);
460 exit_free:
461         kfree(data);
462 exit:
463         return err;
464 }
465
466
467 /* Called when we have found a new GL518SM.
468    Note that we preserve D4:NoFan2 and D2:beep_enable. */
469 static void gl518_init_client(struct i2c_client *client)
470 {
471         /* Make sure we leave D7:Reset untouched */
472         u8 regvalue = gl518_read_value(client, GL518_REG_CONF) & 0x7f;
473
474         /* Comparator mode (D3=0), standby mode (D6=0) */
475         gl518_write_value(client, GL518_REG_CONF, (regvalue &= 0x37));
476
477         /* Never interrupts */
478         gl518_write_value(client, GL518_REG_MASK, 0x00);
479
480         /* Clear status register (D5=1), start (D6=1) */
481         gl518_write_value(client, GL518_REG_CONF, 0x20 | regvalue);
482         gl518_write_value(client, GL518_REG_CONF, 0x40 | regvalue);
483 }
484
485 static int gl518_detach_client(struct i2c_client *client)
486 {
487         struct gl518_data *data = i2c_get_clientdata(client);
488         int err;
489
490         hwmon_device_unregister(data->class_dev);
491
492         if ((err = i2c_detach_client(client)))
493                 return err;
494
495         kfree(data);
496         return 0;
497 }
498
499 /* Registers 0x07 to 0x0c are word-sized, others are byte-sized 
500    GL518 uses a high-byte first convention, which is exactly opposite to
501    the usual practice. */
502 static int gl518_read_value(struct i2c_client *client, u8 reg)
503 {
504         if ((reg >= 0x07) && (reg <= 0x0c))
505                 return swab16(i2c_smbus_read_word_data(client, reg));
506         else
507                 return i2c_smbus_read_byte_data(client, reg);
508 }
509
510 /* Registers 0x07 to 0x0c are word-sized, others are byte-sized 
511    GL518 uses a high-byte first convention, which is exactly opposite to
512    the usual practice. */
513 static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value)
514 {
515         if ((reg >= 0x07) && (reg <= 0x0c))
516                 return i2c_smbus_write_word_data(client, reg, swab16(value));
517         else
518                 return i2c_smbus_write_byte_data(client, reg, value);
519 }
520
521 static struct gl518_data *gl518_update_device(struct device *dev)
522 {
523         struct i2c_client *client = to_i2c_client(dev);
524         struct gl518_data *data = i2c_get_clientdata(client);
525         int val;
526
527         down(&data->update_lock);
528
529         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
530             || !data->valid) {
531                 dev_dbg(&client->dev, "Starting gl518 update\n");
532
533                 data->alarms = gl518_read_value(client, GL518_REG_INT);
534                 data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
535
536                 val = gl518_read_value(client, GL518_REG_VDD_LIMIT);
537                 data->voltage_min[0] = val & 0xff;
538                 data->voltage_max[0] = (val >> 8) & 0xff;
539                 val = gl518_read_value(client, GL518_REG_VIN1_LIMIT);
540                 data->voltage_min[1] = val & 0xff;
541                 data->voltage_max[1] = (val >> 8) & 0xff;
542                 val = gl518_read_value(client, GL518_REG_VIN2_LIMIT);
543                 data->voltage_min[2] = val & 0xff;
544                 data->voltage_max[2] = (val >> 8) & 0xff;
545                 val = gl518_read_value(client, GL518_REG_VIN3_LIMIT);
546                 data->voltage_min[3] = val & 0xff;
547                 data->voltage_max[3] = (val >> 8) & 0xff;
548
549                 val = gl518_read_value(client, GL518_REG_FAN_COUNT);
550                 data->fan_in[0] = (val >> 8) & 0xff;
551                 data->fan_in[1] = val & 0xff;
552
553                 val = gl518_read_value(client, GL518_REG_FAN_LIMIT);
554                 data->fan_min[0] = (val >> 8) & 0xff;
555                 data->fan_min[1] = val & 0xff;
556
557                 data->temp_in = gl518_read_value(client, GL518_REG_TEMP_IN);
558                 data->temp_max =
559                     gl518_read_value(client, GL518_REG_TEMP_MAX);
560                 data->temp_hyst =
561                     gl518_read_value(client, GL518_REG_TEMP_HYST);
562
563                 val = gl518_read_value(client, GL518_REG_MISC);
564                 data->fan_div[0] = (val >> 6) & 0x03;
565                 data->fan_div[1] = (val >> 4) & 0x03;
566                 data->fan_auto1  = (val >> 3) & 0x01;
567
568                 data->alarms &= data->alarm_mask;
569
570                 val = gl518_read_value(client, GL518_REG_CONF);
571                 data->beep_enable = (val >> 2) & 1;
572
573                 if (data->type != gl518sm_r00) {
574                         data->voltage_in[0] =
575                             gl518_read_value(client, GL518_REG_VDD);
576                         data->voltage_in[1] =
577                             gl518_read_value(client, GL518_REG_VIN1);
578                         data->voltage_in[2] =
579                             gl518_read_value(client, GL518_REG_VIN2);
580                 }
581                 data->voltage_in[3] =
582                     gl518_read_value(client, GL518_REG_VIN3);
583
584                 data->last_updated = jiffies;
585                 data->valid = 1;
586         }
587
588         up(&data->update_lock);
589
590         return data;
591 }
592
593 static int __init sensors_gl518sm_init(void)
594 {
595         return i2c_add_driver(&gl518_driver);
596 }
597
598 static void __exit sensors_gl518sm_exit(void)
599 {
600         i2c_del_driver(&gl518_driver);
601 }
602
603 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
604         "Kyosti Malkki <kmalkki@cc.hut.fi> and "
605         "Hong-Gunn Chew <hglinux@gunnet.org>");
606 MODULE_DESCRIPTION("GL518SM driver");
607 MODULE_LICENSE("GPL");
608
609 module_init(sensors_gl518sm_init);
610 module_exit(sensors_gl518sm_exit);