Merge tag 'drm/tegra/for-4.4-rc1' of git://anongit.freedesktop.org/tegra/linux into...
[firefly-linux-kernel-4.4.55.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 <jdelvare@suse.de>
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 enum 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)        clamp_val(((((val) < 0 ? \
90                                 (val) - 500 : \
91                                 (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 = clamp_val(rpm, 1, 960000) * div;
100         return clamp_val((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)          clamp_val((((val) + 9) / 19), 0, 255)
105 #define IN_FROM_REG(val)        ((val) * 19)
106
107 #define VDD_TO_REG(val)         clamp_val((((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 i2c_client *client;
118         const struct attribute_group *groups[3];
119         enum chips type;
120
121         struct mutex update_lock;
122         char valid;             /* !=0 if following fields are valid */
123         unsigned long last_updated;     /* In jiffies */
124
125         u8 voltage_in[4];       /* Register values; [0] = VDD */
126         u8 voltage_min[4];      /* Register values; [0] = VDD */
127         u8 voltage_max[4];      /* Register values; [0] = VDD */
128         u8 fan_in[2];
129         u8 fan_min[2];
130         u8 fan_div[2];          /* Register encoding, shifted right */
131         u8 fan_auto1;           /* Boolean */
132         u8 temp_in;             /* Register values */
133         u8 temp_max;            /* Register values */
134         u8 temp_hyst;           /* Register values */
135         u8 alarms;              /* Register value */
136         u8 alarm_mask;
137         u8 beep_mask;           /* Register value */
138         u8 beep_enable;         /* Boolean */
139 };
140
141 /*
142  * Registers 0x07 to 0x0c are word-sized, others are byte-sized
143  * GL518 uses a high-byte first convention, which is exactly opposite to
144  * the SMBus standard.
145  */
146 static int gl518_read_value(struct i2c_client *client, u8 reg)
147 {
148         if ((reg >= 0x07) && (reg <= 0x0c))
149                 return i2c_smbus_read_word_swapped(client, reg);
150         else
151                 return i2c_smbus_read_byte_data(client, reg);
152 }
153
154 static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value)
155 {
156         if ((reg >= 0x07) && (reg <= 0x0c))
157                 return i2c_smbus_write_word_swapped(client, reg, value);
158         else
159                 return i2c_smbus_write_byte_data(client, reg, value);
160 }
161
162 static struct gl518_data *gl518_update_device(struct device *dev)
163 {
164         struct gl518_data *data = dev_get_drvdata(dev);
165         struct i2c_client *client = data->client;
166         int val;
167
168         mutex_lock(&data->update_lock);
169
170         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
171             || !data->valid) {
172                 dev_dbg(&client->dev, "Starting gl518 update\n");
173
174                 data->alarms = gl518_read_value(client, GL518_REG_INT);
175                 data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
176
177                 val = gl518_read_value(client, GL518_REG_VDD_LIMIT);
178                 data->voltage_min[0] = val & 0xff;
179                 data->voltage_max[0] = (val >> 8) & 0xff;
180                 val = gl518_read_value(client, GL518_REG_VIN1_LIMIT);
181                 data->voltage_min[1] = val & 0xff;
182                 data->voltage_max[1] = (val >> 8) & 0xff;
183                 val = gl518_read_value(client, GL518_REG_VIN2_LIMIT);
184                 data->voltage_min[2] = val & 0xff;
185                 data->voltage_max[2] = (val >> 8) & 0xff;
186                 val = gl518_read_value(client, GL518_REG_VIN3_LIMIT);
187                 data->voltage_min[3] = val & 0xff;
188                 data->voltage_max[3] = (val >> 8) & 0xff;
189
190                 val = gl518_read_value(client, GL518_REG_FAN_COUNT);
191                 data->fan_in[0] = (val >> 8) & 0xff;
192                 data->fan_in[1] = val & 0xff;
193
194                 val = gl518_read_value(client, GL518_REG_FAN_LIMIT);
195                 data->fan_min[0] = (val >> 8) & 0xff;
196                 data->fan_min[1] = val & 0xff;
197
198                 data->temp_in = gl518_read_value(client, GL518_REG_TEMP_IN);
199                 data->temp_max =
200                     gl518_read_value(client, GL518_REG_TEMP_MAX);
201                 data->temp_hyst =
202                     gl518_read_value(client, GL518_REG_TEMP_HYST);
203
204                 val = gl518_read_value(client, GL518_REG_MISC);
205                 data->fan_div[0] = (val >> 6) & 0x03;
206                 data->fan_div[1] = (val >> 4) & 0x03;
207                 data->fan_auto1  = (val >> 3) & 0x01;
208
209                 data->alarms &= data->alarm_mask;
210
211                 val = gl518_read_value(client, GL518_REG_CONF);
212                 data->beep_enable = (val >> 2) & 1;
213
214                 if (data->type != gl518sm_r00) {
215                         data->voltage_in[0] =
216                             gl518_read_value(client, GL518_REG_VDD);
217                         data->voltage_in[1] =
218                             gl518_read_value(client, GL518_REG_VIN1);
219                         data->voltage_in[2] =
220                             gl518_read_value(client, GL518_REG_VIN2);
221                 }
222                 data->voltage_in[3] =
223                     gl518_read_value(client, GL518_REG_VIN3);
224
225                 data->last_updated = jiffies;
226                 data->valid = 1;
227         }
228
229         mutex_unlock(&data->update_lock);
230
231         return data;
232 }
233
234 /*
235  * Sysfs stuff
236  */
237
238 #define show(type, suffix, value)                                       \
239 static ssize_t show_##suffix(struct device *dev,                        \
240                              struct device_attribute *attr, char *buf)  \
241 {                                                                       \
242         struct gl518_data *data = gl518_update_device(dev);             \
243         return sprintf(buf, "%d\n", type##_FROM_REG(data->value));      \
244 }
245
246 show(TEMP, temp_input1, temp_in);
247 show(TEMP, temp_max1, temp_max);
248 show(TEMP, temp_hyst1, temp_hyst);
249 show(BOOL, fan_auto1, fan_auto1);
250 show(VDD, in_input0, voltage_in[0]);
251 show(IN, in_input1, voltage_in[1]);
252 show(IN, in_input2, voltage_in[2]);
253 show(IN, in_input3, voltage_in[3]);
254 show(VDD, in_min0, voltage_min[0]);
255 show(IN, in_min1, voltage_min[1]);
256 show(IN, in_min2, voltage_min[2]);
257 show(IN, in_min3, voltage_min[3]);
258 show(VDD, in_max0, voltage_max[0]);
259 show(IN, in_max1, voltage_max[1]);
260 show(IN, in_max2, voltage_max[2]);
261 show(IN, in_max3, voltage_max[3]);
262 show(RAW, alarms, alarms);
263 show(BOOL, beep_enable, beep_enable);
264 show(BEEP_MASK, beep_mask, beep_mask);
265
266 static ssize_t show_fan_input(struct device *dev,
267                               struct device_attribute *attr, char *buf)
268 {
269         int nr = to_sensor_dev_attr(attr)->index;
270         struct gl518_data *data = gl518_update_device(dev);
271         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_in[nr],
272                                         DIV_FROM_REG(data->fan_div[nr])));
273 }
274
275 static ssize_t show_fan_min(struct device *dev,
276                             struct device_attribute *attr, char *buf)
277 {
278         int nr = to_sensor_dev_attr(attr)->index;
279         struct gl518_data *data = gl518_update_device(dev);
280         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
281                                         DIV_FROM_REG(data->fan_div[nr])));
282 }
283
284 static ssize_t show_fan_div(struct device *dev,
285                             struct device_attribute *attr, char *buf)
286 {
287         int nr = to_sensor_dev_attr(attr)->index;
288         struct gl518_data *data = gl518_update_device(dev);
289         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
290 }
291
292 #define set(type, suffix, value, reg)                                   \
293 static ssize_t set_##suffix(struct device *dev,                         \
294                             struct device_attribute *attr,              \
295                             const char *buf, size_t count)              \
296 {                                                                       \
297         struct gl518_data *data = dev_get_drvdata(dev);                 \
298         struct i2c_client *client = data->client;                       \
299         long val;                                                       \
300         int err = kstrtol(buf, 10, &val);                               \
301         if (err)                                                        \
302                 return err;                                             \
303                                                                         \
304         mutex_lock(&data->update_lock);                                 \
305         data->value = type##_TO_REG(val);                               \
306         gl518_write_value(client, reg, data->value);                    \
307         mutex_unlock(&data->update_lock);                               \
308         return count;                                                   \
309 }
310
311 #define set_bits(type, suffix, value, reg, mask, shift)                 \
312 static ssize_t set_##suffix(struct device *dev,                         \
313                             struct device_attribute *attr,              \
314                             const char *buf, size_t count)              \
315 {                                                                       \
316         struct gl518_data *data = dev_get_drvdata(dev);                 \
317         struct i2c_client *client = data->client;                       \
318         int regvalue;                                                   \
319         unsigned long val;                                              \
320         int err = kstrtoul(buf, 10, &val);                              \
321         if (err)                                                        \
322                 return err;                                             \
323                                                                         \
324         mutex_lock(&data->update_lock);                                 \
325         regvalue = gl518_read_value(client, reg);                       \
326         data->value = type##_TO_REG(val);                               \
327         regvalue = (regvalue & ~mask) | (data->value << shift);         \
328         gl518_write_value(client, reg, regvalue);                       \
329         mutex_unlock(&data->update_lock);                               \
330         return count;                                                   \
331 }
332
333 #define set_low(type, suffix, value, reg)                               \
334         set_bits(type, suffix, value, reg, 0x00ff, 0)
335 #define set_high(type, suffix, value, reg)                              \
336         set_bits(type, suffix, value, reg, 0xff00, 8)
337
338 set(TEMP, temp_max1, temp_max, GL518_REG_TEMP_MAX);
339 set(TEMP, temp_hyst1, temp_hyst, GL518_REG_TEMP_HYST);
340 set_bits(BOOL, fan_auto1, fan_auto1, GL518_REG_MISC, 0x08, 3);
341 set_low(VDD, in_min0, voltage_min[0], GL518_REG_VDD_LIMIT);
342 set_low(IN, in_min1, voltage_min[1], GL518_REG_VIN1_LIMIT);
343 set_low(IN, in_min2, voltage_min[2], GL518_REG_VIN2_LIMIT);
344 set_low(IN, in_min3, voltage_min[3], GL518_REG_VIN3_LIMIT);
345 set_high(VDD, in_max0, voltage_max[0], GL518_REG_VDD_LIMIT);
346 set_high(IN, in_max1, voltage_max[1], GL518_REG_VIN1_LIMIT);
347 set_high(IN, in_max2, voltage_max[2], GL518_REG_VIN2_LIMIT);
348 set_high(IN, in_max3, voltage_max[3], GL518_REG_VIN3_LIMIT);
349 set_bits(BOOL, beep_enable, beep_enable, GL518_REG_CONF, 0x04, 2);
350 set(BEEP_MASK, beep_mask, beep_mask, GL518_REG_ALARM);
351
352 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
353                            const char *buf, size_t count)
354 {
355         struct gl518_data *data = dev_get_drvdata(dev);
356         struct i2c_client *client = data->client;
357         int nr = to_sensor_dev_attr(attr)->index;
358         int regvalue;
359         unsigned long val;
360         int err;
361
362         err = kstrtoul(buf, 10, &val);
363         if (err)
364                 return err;
365
366         mutex_lock(&data->update_lock);
367         regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
368         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
369         regvalue = (regvalue & (0xff << (8 * nr)))
370                  | (data->fan_min[nr] << (8 * (1 - nr)));
371         gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);
372
373         data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
374         if (data->fan_min[nr] == 0)
375                 data->alarm_mask &= ~(0x20 << nr);
376         else
377                 data->alarm_mask |= (0x20 << nr);
378         data->beep_mask &= data->alarm_mask;
379         gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
380
381         mutex_unlock(&data->update_lock);
382         return count;
383 }
384
385 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
386                            const char *buf, size_t count)
387 {
388         struct gl518_data *data = dev_get_drvdata(dev);
389         struct i2c_client *client = data->client;
390         int nr = to_sensor_dev_attr(attr)->index;
391         int regvalue;
392         unsigned long val;
393         int err;
394
395         err = kstrtoul(buf, 10, &val);
396         if (err)
397                 return err;
398
399         switch (val) {
400         case 1:
401                 val = 0;
402                 break;
403         case 2:
404                 val = 1;
405                 break;
406         case 4:
407                 val = 2;
408                 break;
409         case 8:
410                 val = 3;
411                 break;
412         default:
413                 dev_err(dev,
414                         "Invalid fan clock divider %lu, choose one of 1, 2, 4 or 8\n",
415                         val);
416                 return -EINVAL;
417         }
418
419         mutex_lock(&data->update_lock);
420         regvalue = gl518_read_value(client, GL518_REG_MISC);
421         data->fan_div[nr] = val;
422         regvalue = (regvalue & ~(0xc0 >> (2 * nr)))
423                  | (data->fan_div[nr] << (6 - 2 * nr));
424         gl518_write_value(client, GL518_REG_MISC, regvalue);
425         mutex_unlock(&data->update_lock);
426         return count;
427 }
428
429 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
430 static DEVICE_ATTR(temp1_max, S_IWUSR|S_IRUGO, show_temp_max1, set_temp_max1);
431 static DEVICE_ATTR(temp1_max_hyst, S_IWUSR|S_IRUGO,
432         show_temp_hyst1, set_temp_hyst1);
433 static DEVICE_ATTR(fan1_auto, S_IWUSR|S_IRUGO, show_fan_auto1, set_fan_auto1);
434 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
435 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
436 static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR|S_IRUGO,
437         show_fan_min, set_fan_min, 0);
438 static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR|S_IRUGO,
439         show_fan_min, set_fan_min, 1);
440 static SENSOR_DEVICE_ATTR(fan1_div, S_IWUSR|S_IRUGO,
441         show_fan_div, set_fan_div, 0);
442 static SENSOR_DEVICE_ATTR(fan2_div, S_IWUSR|S_IRUGO,
443         show_fan_div, set_fan_div, 1);
444 static DEVICE_ATTR(in0_input, S_IRUGO, show_in_input0, NULL);
445 static DEVICE_ATTR(in1_input, S_IRUGO, show_in_input1, NULL);
446 static DEVICE_ATTR(in2_input, S_IRUGO, show_in_input2, NULL);
447 static DEVICE_ATTR(in3_input, S_IRUGO, show_in_input3, NULL);
448 static DEVICE_ATTR(in0_min, S_IWUSR|S_IRUGO, show_in_min0, set_in_min0);
449 static DEVICE_ATTR(in1_min, S_IWUSR|S_IRUGO, show_in_min1, set_in_min1);
450 static DEVICE_ATTR(in2_min, S_IWUSR|S_IRUGO, show_in_min2, set_in_min2);
451 static DEVICE_ATTR(in3_min, S_IWUSR|S_IRUGO, show_in_min3, set_in_min3);
452 static DEVICE_ATTR(in0_max, S_IWUSR|S_IRUGO, show_in_max0, set_in_max0);
453 static DEVICE_ATTR(in1_max, S_IWUSR|S_IRUGO, show_in_max1, set_in_max1);
454 static DEVICE_ATTR(in2_max, S_IWUSR|S_IRUGO, show_in_max2, set_in_max2);
455 static DEVICE_ATTR(in3_max, S_IWUSR|S_IRUGO, show_in_max3, set_in_max3);
456 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
457 static DEVICE_ATTR(beep_enable, S_IWUSR|S_IRUGO,
458         show_beep_enable, set_beep_enable);
459 static DEVICE_ATTR(beep_mask, S_IWUSR|S_IRUGO,
460         show_beep_mask, set_beep_mask);
461
462 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
463                           char *buf)
464 {
465         int bitnr = to_sensor_dev_attr(attr)->index;
466         struct gl518_data *data = gl518_update_device(dev);
467         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
468 }
469
470 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
471 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
472 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
473 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
474 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
475 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 5);
476 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 6);
477
478 static ssize_t show_beep(struct device *dev, struct device_attribute *attr,
479                           char *buf)
480 {
481         int bitnr = to_sensor_dev_attr(attr)->index;
482         struct gl518_data *data = gl518_update_device(dev);
483         return sprintf(buf, "%u\n", (data->beep_mask >> bitnr) & 1);
484 }
485
486 static ssize_t set_beep(struct device *dev, struct device_attribute *attr,
487                         const char *buf, size_t count)
488 {
489         struct gl518_data *data = dev_get_drvdata(dev);
490         struct i2c_client *client = data->client;
491         int bitnr = to_sensor_dev_attr(attr)->index;
492         unsigned long bit;
493         int err;
494
495         err = kstrtoul(buf, 10, &bit);
496         if (err)
497                 return err;
498
499         if (bit & ~1)
500                 return -EINVAL;
501
502         mutex_lock(&data->update_lock);
503         data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
504         if (bit)
505                 data->beep_mask |= (1 << bitnr);
506         else
507                 data->beep_mask &= ~(1 << bitnr);
508         gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
509         mutex_unlock(&data->update_lock);
510         return count;
511 }
512
513 static SENSOR_DEVICE_ATTR(in0_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 0);
514 static SENSOR_DEVICE_ATTR(in1_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 1);
515 static SENSOR_DEVICE_ATTR(in2_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 2);
516 static SENSOR_DEVICE_ATTR(in3_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 3);
517 static SENSOR_DEVICE_ATTR(temp1_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 4);
518 static SENSOR_DEVICE_ATTR(fan1_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 5);
519 static SENSOR_DEVICE_ATTR(fan2_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 6);
520
521 static struct attribute *gl518_attributes[] = {
522         &dev_attr_in3_input.attr,
523         &dev_attr_in0_min.attr,
524         &dev_attr_in1_min.attr,
525         &dev_attr_in2_min.attr,
526         &dev_attr_in3_min.attr,
527         &dev_attr_in0_max.attr,
528         &dev_attr_in1_max.attr,
529         &dev_attr_in2_max.attr,
530         &dev_attr_in3_max.attr,
531         &sensor_dev_attr_in0_alarm.dev_attr.attr,
532         &sensor_dev_attr_in1_alarm.dev_attr.attr,
533         &sensor_dev_attr_in2_alarm.dev_attr.attr,
534         &sensor_dev_attr_in3_alarm.dev_attr.attr,
535         &sensor_dev_attr_in0_beep.dev_attr.attr,
536         &sensor_dev_attr_in1_beep.dev_attr.attr,
537         &sensor_dev_attr_in2_beep.dev_attr.attr,
538         &sensor_dev_attr_in3_beep.dev_attr.attr,
539
540         &dev_attr_fan1_auto.attr,
541         &sensor_dev_attr_fan1_input.dev_attr.attr,
542         &sensor_dev_attr_fan2_input.dev_attr.attr,
543         &sensor_dev_attr_fan1_min.dev_attr.attr,
544         &sensor_dev_attr_fan2_min.dev_attr.attr,
545         &sensor_dev_attr_fan1_div.dev_attr.attr,
546         &sensor_dev_attr_fan2_div.dev_attr.attr,
547         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
548         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
549         &sensor_dev_attr_fan1_beep.dev_attr.attr,
550         &sensor_dev_attr_fan2_beep.dev_attr.attr,
551
552         &dev_attr_temp1_input.attr,
553         &dev_attr_temp1_max.attr,
554         &dev_attr_temp1_max_hyst.attr,
555         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
556         &sensor_dev_attr_temp1_beep.dev_attr.attr,
557
558         &dev_attr_alarms.attr,
559         &dev_attr_beep_enable.attr,
560         &dev_attr_beep_mask.attr,
561         NULL
562 };
563
564 static const struct attribute_group gl518_group = {
565         .attrs = gl518_attributes,
566 };
567
568 static struct attribute *gl518_attributes_r80[] = {
569         &dev_attr_in0_input.attr,
570         &dev_attr_in1_input.attr,
571         &dev_attr_in2_input.attr,
572         NULL
573 };
574
575 static const struct attribute_group gl518_group_r80 = {
576         .attrs = gl518_attributes_r80,
577 };
578
579 /*
580  * Real code
581  */
582
583 /* Return 0 if detection is successful, -ENODEV otherwise */
584 static int gl518_detect(struct i2c_client *client, struct i2c_board_info *info)
585 {
586         struct i2c_adapter *adapter = client->adapter;
587         int rev;
588
589         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
590                                      I2C_FUNC_SMBUS_WORD_DATA))
591                 return -ENODEV;
592
593         /* Now, we do the remaining detection. */
594         if ((gl518_read_value(client, GL518_REG_CHIP_ID) != 0x80)
595          || (gl518_read_value(client, GL518_REG_CONF) & 0x80))
596                 return -ENODEV;
597
598         /* Determine the chip type. */
599         rev = gl518_read_value(client, GL518_REG_REVISION);
600         if (rev != 0x00 && rev != 0x80)
601                 return -ENODEV;
602
603         strlcpy(info->type, "gl518sm", I2C_NAME_SIZE);
604
605         return 0;
606 }
607
608 /*
609  * Called when we have found a new GL518SM.
610  * Note that we preserve D4:NoFan2 and D2:beep_enable.
611  */
612 static void gl518_init_client(struct i2c_client *client)
613 {
614         /* Make sure we leave D7:Reset untouched */
615         u8 regvalue = gl518_read_value(client, GL518_REG_CONF) & 0x7f;
616
617         /* Comparator mode (D3=0), standby mode (D6=0) */
618         gl518_write_value(client, GL518_REG_CONF, (regvalue &= 0x37));
619
620         /* Never interrupts */
621         gl518_write_value(client, GL518_REG_MASK, 0x00);
622
623         /* Clear status register (D5=1), start (D6=1) */
624         gl518_write_value(client, GL518_REG_CONF, 0x20 | regvalue);
625         gl518_write_value(client, GL518_REG_CONF, 0x40 | regvalue);
626 }
627
628 static int gl518_probe(struct i2c_client *client,
629                        const struct i2c_device_id *id)
630 {
631         struct device *dev = &client->dev;
632         struct device *hwmon_dev;
633         struct gl518_data *data;
634         int revision;
635
636         data = devm_kzalloc(dev, sizeof(struct gl518_data), GFP_KERNEL);
637         if (!data)
638                 return -ENOMEM;
639
640         data->client = client;
641         revision = gl518_read_value(client, GL518_REG_REVISION);
642         data->type = revision == 0x80 ? gl518sm_r80 : gl518sm_r00;
643         mutex_init(&data->update_lock);
644
645         /* Initialize the GL518SM chip */
646         data->alarm_mask = 0xff;
647         gl518_init_client(client);
648
649         /* sysfs hooks */
650         data->groups[0] = &gl518_group;
651         if (data->type == gl518sm_r80)
652                 data->groups[1] = &gl518_group_r80;
653
654         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
655                                                            data, data->groups);
656         return PTR_ERR_OR_ZERO(hwmon_dev);
657 }
658
659 static const struct i2c_device_id gl518_id[] = {
660         { "gl518sm", 0 },
661         { }
662 };
663 MODULE_DEVICE_TABLE(i2c, gl518_id);
664
665 static struct i2c_driver gl518_driver = {
666         .class          = I2C_CLASS_HWMON,
667         .driver = {
668                 .name   = "gl518sm",
669         },
670         .probe          = gl518_probe,
671         .id_table       = gl518_id,
672         .detect         = gl518_detect,
673         .address_list   = normal_i2c,
674 };
675
676 module_i2c_driver(gl518_driver);
677
678 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
679         "Kyosti Malkki <kmalkki@cc.hut.fi> and "
680         "Hong-Gunn Chew <hglinux@gunnet.org>");
681 MODULE_DESCRIPTION("GL518SM driver");
682 MODULE_LICENSE("GPL");