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ar7_wdt watchdog driver: Fix locking
[linux-2.6/mini2440.git] / drivers / hwmon / gl518sm.c
blob7820df45d77a7dd56312b890b2756c6bb2c8560c
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);
Support for the Chinese Samsung S3C2440 based development boards