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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 */
47static const unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };
48
49enum chips { gl518sm_r00, gl518sm_r80 };
50
51/* Many GL518 constants specified below */
52
53/* The GL518 registers */
54#define GL518_REG_CHIP_ID 0x00
55#define GL518_REG_REVISION 0x01
56#define GL518_REG_VENDOR_ID 0x02
57#define GL518_REG_CONF 0x03
58#define GL518_REG_TEMP_IN 0x04
59#define GL518_REG_TEMP_MAX 0x05
60#define GL518_REG_TEMP_HYST 0x06
61#define GL518_REG_FAN_COUNT 0x07
62#define GL518_REG_FAN_LIMIT 0x08
63#define GL518_REG_VIN1_LIMIT 0x09
64#define GL518_REG_VIN2_LIMIT 0x0a
65#define GL518_REG_VIN3_LIMIT 0x0b
66#define GL518_REG_VDD_LIMIT 0x0c
67#define GL518_REG_VIN3 0x0d
68#define GL518_REG_MISC 0x0f
69#define GL518_REG_ALARM 0x10
70#define GL518_REG_MASK 0x11
71#define GL518_REG_INT 0x12
72#define GL518_REG_VIN2 0x13
73#define GL518_REG_VIN1 0x14
74#define GL518_REG_VDD 0x15
75
76
77/*
78 * Conversions. Rounding and limit checking is only done on the TO_REG
79 * variants. Note that you should be a bit careful with which arguments
80 * these macros are called: arguments may be evaluated more than once.
81 * Fixing this is just not worth it.
82 */
83
84#define RAW_FROM_REG(val) val
85
86#define BOOL_FROM_REG(val) ((val) ? 0 : 1)
87#define BOOL_TO_REG(val) ((val) ? 0 : 1)
88
89#define TEMP_TO_REG(val) SENSORS_LIMIT(((((val) < 0 ? \
90 (val) - 500 : \
91 (val) + 500) / 1000) + 119), 0, 255)
92#define TEMP_FROM_REG(val) (((val) - 119) * 1000)
93
94static 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 */
116struct 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
140static int gl518_probe(struct i2c_client *client,
141 const struct i2c_device_id *id);
142static int gl518_detect(struct i2c_client *client, struct i2c_board_info *info);
143static void gl518_init_client(struct i2c_client *client);
144static int gl518_remove(struct i2c_client *client);
145static int gl518_read_value(struct i2c_client *client, u8 reg);
146static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value);
147static struct gl518_data *gl518_update_device(struct device *dev);
148
149static const struct i2c_device_id gl518_id[] = {
150 { "gl518sm", 0 },
151 { }
152};
153MODULE_DEVICE_TABLE(i2c, gl518_id);
154
155/* This is the driver that will be inserted */
156static struct i2c_driver gl518_driver = {
157 .class = I2C_CLASS_HWMON,
158 .driver = {
159 .name = "gl518sm",
160 },
161 .probe = gl518_probe,
162 .remove = gl518_remove,
163 .id_table = gl518_id,
164 .detect = gl518_detect,
165 .address_list = normal_i2c,
166};
167
168/*
169 * Sysfs stuff
170 */
171
172#define show(type, suffix, value) \
173static ssize_t show_##suffix(struct device *dev, \
174 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
180show(TEMP, temp_input1, temp_in);
181show(TEMP, temp_max1, temp_max);
182show(TEMP, temp_hyst1, temp_hyst);
183show(BOOL, fan_auto1, fan_auto1);
184show(VDD, in_input0, voltage_in[0]);
185show(IN, in_input1, voltage_in[1]);
186show(IN, in_input2, voltage_in[2]);
187show(IN, in_input3, voltage_in[3]);
188show(VDD, in_min0, voltage_min[0]);
189show(IN, in_min1, voltage_min[1]);
190show(IN, in_min2, voltage_min[2]);
191show(IN, in_min3, voltage_min[3]);
192show(VDD, in_max0, voltage_max[0]);
193show(IN, in_max1, voltage_max[1]);
194show(IN, in_max2, voltage_max[2]);
195show(IN, in_max3, voltage_max[3]);
196show(RAW, alarms, alarms);
197show(BOOL, beep_enable, beep_enable);
198show(BEEP_MASK, beep_mask, beep_mask);
199
200static 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
209static 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
218static 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) \
227static ssize_t set_##suffix(struct device *dev, \
228 struct device_attribute *attr, \
229 const char *buf, size_t count) \
230{ \
231 struct i2c_client *client = to_i2c_client(dev); \
232 struct gl518_data *data = i2c_get_clientdata(client); \
233 long val; \
234 int err = kstrtol(buf, 10, &val); \
235 if (err) \
236 return err; \
237 \
238 mutex_lock(&data->update_lock); \
239 data->value = type##_TO_REG(val); \
240 gl518_write_value(client, reg, data->value); \
241 mutex_unlock(&data->update_lock); \
242 return count; \
243}
244
245#define set_bits(type, suffix, value, reg, mask, shift) \
246static ssize_t set_##suffix(struct device *dev, \
247 struct device_attribute *attr, \
248 const char *buf, size_t count) \
249{ \
250 struct i2c_client *client = to_i2c_client(dev); \
251 struct gl518_data *data = i2c_get_clientdata(client); \
252 int regvalue; \
253 unsigned long val; \
254 int err = kstrtoul(buf, 10, &val); \
255 if (err) \
256 return err; \
257 \
258 mutex_lock(&data->update_lock); \
259 regvalue = gl518_read_value(client, reg); \
260 data->value = type##_TO_REG(val); \
261 regvalue = (regvalue & ~mask) | (data->value << shift); \
262 gl518_write_value(client, reg, regvalue); \
263 mutex_unlock(&data->update_lock); \
264 return count; \
265}
266
267#define set_low(type, suffix, value, reg) \
268 set_bits(type, suffix, value, reg, 0x00ff, 0)
269#define set_high(type, suffix, value, reg) \
270 set_bits(type, suffix, value, reg, 0xff00, 8)
271
272set(TEMP, temp_max1, temp_max, GL518_REG_TEMP_MAX);
273set(TEMP, temp_hyst1, temp_hyst, GL518_REG_TEMP_HYST);
274set_bits(BOOL, fan_auto1, fan_auto1, GL518_REG_MISC, 0x08, 3);
275set_low(VDD, in_min0, voltage_min[0], GL518_REG_VDD_LIMIT);
276set_low(IN, in_min1, voltage_min[1], GL518_REG_VIN1_LIMIT);
277set_low(IN, in_min2, voltage_min[2], GL518_REG_VIN2_LIMIT);
278set_low(IN, in_min3, voltage_min[3], GL518_REG_VIN3_LIMIT);
279set_high(VDD, in_max0, voltage_max[0], GL518_REG_VDD_LIMIT);
280set_high(IN, in_max1, voltage_max[1], GL518_REG_VIN1_LIMIT);
281set_high(IN, in_max2, voltage_max[2], GL518_REG_VIN2_LIMIT);
282set_high(IN, in_max3, voltage_max[3], GL518_REG_VIN3_LIMIT);
283set_bits(BOOL, beep_enable, beep_enable, GL518_REG_CONF, 0x04, 2);
284set(BEEP_MASK, beep_mask, beep_mask, GL518_REG_ALARM);
285
286static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
287 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 nr = to_sensor_dev_attr(attr)->index;
292 int regvalue;
293 unsigned long val;
294 int err;
295
296 err = kstrtoul(buf, 10, &val);
297 if (err)
298 return err;
299
300 mutex_lock(&data->update_lock);
301 regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
302 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
303 regvalue = (regvalue & (0xff << (8 * nr)))
304 | (data->fan_min[nr] << (8 * (1 - nr)));
305 gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);
306
307 data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
308 if (data->fan_min[nr] == 0)
309 data->alarm_mask &= ~(0x20 << nr);
310 else
311 data->alarm_mask |= (0x20 << nr);
312 data->beep_mask &= data->alarm_mask;
313 gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
314
315 mutex_unlock(&data->update_lock);
316 return count;
317}
318
319static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
320 const char *buf, size_t count)
321{
322 struct i2c_client *client = to_i2c_client(dev);
323 struct gl518_data *data = i2c_get_clientdata(client);
324 int nr = to_sensor_dev_attr(attr)->index;
325 int regvalue;
326 unsigned long val;
327 int err;
328
329 err = kstrtoul(buf, 10, &val);
330 if (err)
331 return err;
332
333 switch (val) {
334 case 1:
335 val = 0;
336 break;
337 case 2:
338 val = 1;
339 break;
340 case 4:
341 val = 2;
342 break;
343 case 8:
344 val = 3;
345 break;
346 default:
347 dev_err(dev, "Invalid fan clock divider %lu, choose one "
348 "of 1, 2, 4 or 8\n", val);
349 return -EINVAL;
350 }
351
352 mutex_lock(&data->update_lock);
353 regvalue = gl518_read_value(client, GL518_REG_MISC);
354 data->fan_div[nr] = val;
355 regvalue = (regvalue & ~(0xc0 >> (2 * nr)))
356 | (data->fan_div[nr] << (6 - 2 * nr));
357 gl518_write_value(client, GL518_REG_MISC, regvalue);
358 mutex_unlock(&data->update_lock);
359 return count;
360}
361
362static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
363static DEVICE_ATTR(temp1_max, S_IWUSR|S_IRUGO, show_temp_max1, set_temp_max1);
364static DEVICE_ATTR(temp1_max_hyst, S_IWUSR|S_IRUGO,
365 show_temp_hyst1, set_temp_hyst1);
366static DEVICE_ATTR(fan1_auto, S_IWUSR|S_IRUGO, show_fan_auto1, set_fan_auto1);
367static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
368static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
369static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR|S_IRUGO,
370 show_fan_min, set_fan_min, 0);
371static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR|S_IRUGO,
372 show_fan_min, set_fan_min, 1);
373static SENSOR_DEVICE_ATTR(fan1_div, S_IWUSR|S_IRUGO,
374 show_fan_div, set_fan_div, 0);
375static SENSOR_DEVICE_ATTR(fan2_div, S_IWUSR|S_IRUGO,
376 show_fan_div, set_fan_div, 1);
377static DEVICE_ATTR(in0_input, S_IRUGO, show_in_input0, NULL);
378static DEVICE_ATTR(in1_input, S_IRUGO, show_in_input1, NULL);
379static DEVICE_ATTR(in2_input, S_IRUGO, show_in_input2, NULL);
380static DEVICE_ATTR(in3_input, S_IRUGO, show_in_input3, NULL);
381static DEVICE_ATTR(in0_min, S_IWUSR|S_IRUGO, show_in_min0, set_in_min0);
382static DEVICE_ATTR(in1_min, S_IWUSR|S_IRUGO, show_in_min1, set_in_min1);
383static DEVICE_ATTR(in2_min, S_IWUSR|S_IRUGO, show_in_min2, set_in_min2);
384static DEVICE_ATTR(in3_min, S_IWUSR|S_IRUGO, show_in_min3, set_in_min3);
385static DEVICE_ATTR(in0_max, S_IWUSR|S_IRUGO, show_in_max0, set_in_max0);
386static DEVICE_ATTR(in1_max, S_IWUSR|S_IRUGO, show_in_max1, set_in_max1);
387static DEVICE_ATTR(in2_max, S_IWUSR|S_IRUGO, show_in_max2, set_in_max2);
388static DEVICE_ATTR(in3_max, S_IWUSR|S_IRUGO, show_in_max3, set_in_max3);
389static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
390static DEVICE_ATTR(beep_enable, S_IWUSR|S_IRUGO,
391 show_beep_enable, set_beep_enable);
392static DEVICE_ATTR(beep_mask, S_IWUSR|S_IRUGO,
393 show_beep_mask, set_beep_mask);
394
395static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
396 char *buf)
397{
398 int bitnr = to_sensor_dev_attr(attr)->index;
399 struct gl518_data *data = gl518_update_device(dev);
400 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
401}
402
403static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
404static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
405static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
406static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
407static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
408static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 5);
409static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 6);
410
411static ssize_t show_beep(struct device *dev, struct device_attribute *attr,
412 char *buf)
413{
414 int bitnr = to_sensor_dev_attr(attr)->index;
415 struct gl518_data *data = gl518_update_device(dev);
416 return sprintf(buf, "%u\n", (data->beep_mask >> bitnr) & 1);
417}
418
419static ssize_t set_beep(struct device *dev, struct device_attribute *attr,
420 const char *buf, size_t count)
421{
422 struct i2c_client *client = to_i2c_client(dev);
423 struct gl518_data *data = i2c_get_clientdata(client);
424 int bitnr = to_sensor_dev_attr(attr)->index;
425 unsigned long bit;
426 int err;
427
428 err = kstrtoul(buf, 10, &bit);
429 if (err)
430 return err;
431
432 if (bit & ~1)
433 return -EINVAL;
434
435 mutex_lock(&data->update_lock);
436 data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
437 if (bit)
438 data->beep_mask |= (1 << bitnr);
439 else
440 data->beep_mask &= ~(1 << bitnr);
441 gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
442 mutex_unlock(&data->update_lock);
443 return count;
444}
445
446static SENSOR_DEVICE_ATTR(in0_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 0);
447static SENSOR_DEVICE_ATTR(in1_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 1);
448static SENSOR_DEVICE_ATTR(in2_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 2);
449static SENSOR_DEVICE_ATTR(in3_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 3);
450static SENSOR_DEVICE_ATTR(temp1_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 4);
451static SENSOR_DEVICE_ATTR(fan1_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 5);
452static SENSOR_DEVICE_ATTR(fan2_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 6);
453
454static struct attribute *gl518_attributes[] = {
455 &dev_attr_in3_input.attr,
456 &dev_attr_in0_min.attr,
457 &dev_attr_in1_min.attr,
458 &dev_attr_in2_min.attr,
459 &dev_attr_in3_min.attr,
460 &dev_attr_in0_max.attr,
461 &dev_attr_in1_max.attr,
462 &dev_attr_in2_max.attr,
463 &dev_attr_in3_max.attr,
464 &sensor_dev_attr_in0_alarm.dev_attr.attr,
465 &sensor_dev_attr_in1_alarm.dev_attr.attr,
466 &sensor_dev_attr_in2_alarm.dev_attr.attr,
467 &sensor_dev_attr_in3_alarm.dev_attr.attr,
468 &sensor_dev_attr_in0_beep.dev_attr.attr,
469 &sensor_dev_attr_in1_beep.dev_attr.attr,
470 &sensor_dev_attr_in2_beep.dev_attr.attr,
471 &sensor_dev_attr_in3_beep.dev_attr.attr,
472
473 &dev_attr_fan1_auto.attr,
474 &sensor_dev_attr_fan1_input.dev_attr.attr,
475 &sensor_dev_attr_fan2_input.dev_attr.attr,
476 &sensor_dev_attr_fan1_min.dev_attr.attr,
477 &sensor_dev_attr_fan2_min.dev_attr.attr,
478 &sensor_dev_attr_fan1_div.dev_attr.attr,
479 &sensor_dev_attr_fan2_div.dev_attr.attr,
480 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
481 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
482 &sensor_dev_attr_fan1_beep.dev_attr.attr,
483 &sensor_dev_attr_fan2_beep.dev_attr.attr,
484
485 &dev_attr_temp1_input.attr,
486 &dev_attr_temp1_max.attr,
487 &dev_attr_temp1_max_hyst.attr,
488 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
489 &sensor_dev_attr_temp1_beep.dev_attr.attr,
490
491 &dev_attr_alarms.attr,
492 &dev_attr_beep_enable.attr,
493 &dev_attr_beep_mask.attr,
494 NULL
495};
496
497static const struct attribute_group gl518_group = {
498 .attrs = gl518_attributes,
499};
500
501static struct attribute *gl518_attributes_r80[] = {
502 &dev_attr_in0_input.attr,
503 &dev_attr_in1_input.attr,
504 &dev_attr_in2_input.attr,
505 NULL
506};
507
508static const struct attribute_group gl518_group_r80 = {
509 .attrs = gl518_attributes_r80,
510};
511
512/*
513 * Real code
514 */
515
516/* Return 0 if detection is successful, -ENODEV otherwise */
517static int gl518_detect(struct i2c_client *client, struct i2c_board_info *info)
518{
519 struct i2c_adapter *adapter = client->adapter;
520 int rev;
521
522 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
523 I2C_FUNC_SMBUS_WORD_DATA))
524 return -ENODEV;
525
526 /* Now, we do the remaining detection. */
527 if ((gl518_read_value(client, GL518_REG_CHIP_ID) != 0x80)
528 || (gl518_read_value(client, GL518_REG_CONF) & 0x80))
529 return -ENODEV;
530
531 /* Determine the chip type. */
532 rev = gl518_read_value(client, GL518_REG_REVISION);
533 if (rev != 0x00 && rev != 0x80)
534 return -ENODEV;
535
536 strlcpy(info->type, "gl518sm", I2C_NAME_SIZE);
537
538 return 0;
539}
540
541static int gl518_probe(struct i2c_client *client,
542 const struct i2c_device_id *id)
543{
544 struct gl518_data *data;
545 int err, revision;
546
547 data = kzalloc(sizeof(struct gl518_data), GFP_KERNEL);
548 if (!data) {
549 err = -ENOMEM;
550 goto exit;
551 }
552
553 i2c_set_clientdata(client, data);
554 revision = gl518_read_value(client, GL518_REG_REVISION);
555 data->type = revision == 0x80 ? gl518sm_r80 : gl518sm_r00;
556 mutex_init(&data->update_lock);
557
558 /* Initialize the GL518SM chip */
559 data->alarm_mask = 0xff;
560 gl518_init_client(client);
561
562 /* Register sysfs hooks */
563 err = sysfs_create_group(&client->dev.kobj, &gl518_group);
564 if (err)
565 goto exit_free;
566 if (data->type == gl518sm_r80) {
567 err = sysfs_create_group(&client->dev.kobj, &gl518_group_r80);
568 if (err)
569 goto exit_remove_files;
570 }
571
572 data->hwmon_dev = hwmon_device_register(&client->dev);
573 if (IS_ERR(data->hwmon_dev)) {
574 err = PTR_ERR(data->hwmon_dev);
575 goto exit_remove_files;
576 }
577
578 return 0;
579
580exit_remove_files:
581 sysfs_remove_group(&client->dev.kobj, &gl518_group);
582 if (data->type == gl518sm_r80)
583 sysfs_remove_group(&client->dev.kobj, &gl518_group_r80);
584exit_free:
585 kfree(data);
586exit:
587 return err;
588}
589
590
591/*
592 * Called when we have found a new GL518SM.
593 * Note that we preserve D4:NoFan2 and D2:beep_enable.
594 */
595static void gl518_init_client(struct i2c_client *client)
596{
597 /* Make sure we leave D7:Reset untouched */
598 u8 regvalue = gl518_read_value(client, GL518_REG_CONF) & 0x7f;
599
600 /* Comparator mode (D3=0), standby mode (D6=0) */
601 gl518_write_value(client, GL518_REG_CONF, (regvalue &= 0x37));
602
603 /* Never interrupts */
604 gl518_write_value(client, GL518_REG_MASK, 0x00);
605
606 /* Clear status register (D5=1), start (D6=1) */
607 gl518_write_value(client, GL518_REG_CONF, 0x20 | regvalue);
608 gl518_write_value(client, GL518_REG_CONF, 0x40 | regvalue);
609}
610
611static int gl518_remove(struct i2c_client *client)
612{
613 struct gl518_data *data = i2c_get_clientdata(client);
614
615 hwmon_device_unregister(data->hwmon_dev);
616 sysfs_remove_group(&client->dev.kobj, &gl518_group);
617 if (data->type == gl518sm_r80)
618 sysfs_remove_group(&client->dev.kobj, &gl518_group_r80);
619
620 kfree(data);
621 return 0;
622}
623
624/*
625 * Registers 0x07 to 0x0c are word-sized, others are byte-sized
626 * GL518 uses a high-byte first convention, which is exactly opposite to
627 * the SMBus standard.
628 */
629static int gl518_read_value(struct i2c_client *client, u8 reg)
630{
631 if ((reg >= 0x07) && (reg <= 0x0c))
632 return i2c_smbus_read_word_swapped(client, reg);
633 else
634 return i2c_smbus_read_byte_data(client, reg);
635}
636
637static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value)
638{
639 if ((reg >= 0x07) && (reg <= 0x0c))
640 return i2c_smbus_write_word_swapped(client, reg, value);
641 else
642 return i2c_smbus_write_byte_data(client, reg, value);
643}
644
645static struct gl518_data *gl518_update_device(struct device *dev)
646{
647 struct i2c_client *client = to_i2c_client(dev);
648 struct gl518_data *data = i2c_get_clientdata(client);
649 int val;
650
651 mutex_lock(&data->update_lock);
652
653 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
654 || !data->valid) {
655 dev_dbg(&client->dev, "Starting gl518 update\n");
656
657 data->alarms = gl518_read_value(client, GL518_REG_INT);
658 data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
659
660 val = gl518_read_value(client, GL518_REG_VDD_LIMIT);
661 data->voltage_min[0] = val & 0xff;
662 data->voltage_max[0] = (val >> 8) & 0xff;
663 val = gl518_read_value(client, GL518_REG_VIN1_LIMIT);
664 data->voltage_min[1] = val & 0xff;
665 data->voltage_max[1] = (val >> 8) & 0xff;
666 val = gl518_read_value(client, GL518_REG_VIN2_LIMIT);
667 data->voltage_min[2] = val & 0xff;
668 data->voltage_max[2] = (val >> 8) & 0xff;
669 val = gl518_read_value(client, GL518_REG_VIN3_LIMIT);
670 data->voltage_min[3] = val & 0xff;
671 data->voltage_max[3] = (val >> 8) & 0xff;
672
673 val = gl518_read_value(client, GL518_REG_FAN_COUNT);
674 data->fan_in[0] = (val >> 8) & 0xff;
675 data->fan_in[1] = val & 0xff;
676
677 val = gl518_read_value(client, GL518_REG_FAN_LIMIT);
678 data->fan_min[0] = (val >> 8) & 0xff;
679 data->fan_min[1] = val & 0xff;
680
681 data->temp_in = gl518_read_value(client, GL518_REG_TEMP_IN);
682 data->temp_max =
683 gl518_read_value(client, GL518_REG_TEMP_MAX);
684 data->temp_hyst =
685 gl518_read_value(client, GL518_REG_TEMP_HYST);
686
687 val = gl518_read_value(client, GL518_REG_MISC);
688 data->fan_div[0] = (val >> 6) & 0x03;
689 data->fan_div[1] = (val >> 4) & 0x03;
690 data->fan_auto1 = (val >> 3) & 0x01;
691
692 data->alarms &= data->alarm_mask;
693
694 val = gl518_read_value(client, GL518_REG_CONF);
695 data->beep_enable = (val >> 2) & 1;
696
697 if (data->type != gl518sm_r00) {
698 data->voltage_in[0] =
699 gl518_read_value(client, GL518_REG_VDD);
700 data->voltage_in[1] =
701 gl518_read_value(client, GL518_REG_VIN1);
702 data->voltage_in[2] =
703 gl518_read_value(client, GL518_REG_VIN2);
704 }
705 data->voltage_in[3] =
706 gl518_read_value(client, GL518_REG_VIN3);
707
708 data->last_updated = jiffies;
709 data->valid = 1;
710 }
711
712 mutex_unlock(&data->update_lock);
713
714 return data;
715}
716
717module_i2c_driver(gl518_driver);
718
719MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
720 "Kyosti Malkki <kmalkki@cc.hut.fi> and "
721 "Hong-Gunn Chew <hglinux@gunnet.org>");
722MODULE_DESCRIPTION("GL518SM driver");
723MODULE_LICENSE("GPL");