Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / hwmon / thmc50.c
1 /*
2  * thmc50.c - Part of lm_sensors, Linux kernel modules for hardware
3  *            monitoring
4  * Copyright (C) 2007 Krzysztof Helt <krzysztof.h1@wp.pl>
5  * Based on 2.4 driver by Frodo Looijaard <frodol@dds.nl> and
6  * Philip Edelbrock <phil@netroedge.com>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21  */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25 #include <linux/slab.h>
26 #include <linux/i2c.h>
27 #include <linux/hwmon.h>
28 #include <linux/hwmon-sysfs.h>
29 #include <linux/err.h>
30 #include <linux/mutex.h>
31
32 MODULE_LICENSE("GPL");
33
34 /* Addresses to scan */
35 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
36
37 /* Insmod parameters */
38 enum chips { thmc50, adm1022 };
39
40 static unsigned short adm1022_temp3[16];
41 static unsigned int adm1022_temp3_num;
42 module_param_array(adm1022_temp3, ushort, &adm1022_temp3_num, 0);
43 MODULE_PARM_DESC(adm1022_temp3, "List of adapter,address pairs "
44                         "to enable 3rd temperature (ADM1022 only)");
45
46 /* Many THMC50 constants specified below */
47
48 /* The THMC50 registers */
49 #define THMC50_REG_CONF                         0x40
50 #define THMC50_REG_COMPANY_ID                   0x3E
51 #define THMC50_REG_DIE_CODE                     0x3F
52 #define THMC50_REG_ANALOG_OUT                   0x19
53 /*
54  * The mirror status register cannot be used as
55  * reading it does not clear alarms.
56  */
57 #define THMC50_REG_INTR                         0x41
58
59 static const u8 THMC50_REG_TEMP[] = { 0x27, 0x26, 0x20 };
60 static const u8 THMC50_REG_TEMP_MIN[] = { 0x3A, 0x38, 0x2C };
61 static const u8 THMC50_REG_TEMP_MAX[] = { 0x39, 0x37, 0x2B };
62 static const u8 THMC50_REG_TEMP_CRITICAL[] = { 0x13, 0x14, 0x14 };
63 static const u8 THMC50_REG_TEMP_DEFAULT[] = { 0x17, 0x18, 0x18 };
64
65 #define THMC50_REG_CONF_nFANOFF                 0x20
66 #define THMC50_REG_CONF_PROGRAMMED              0x08
67
68 /* Each client has this additional data */
69 struct thmc50_data {
70         struct device *hwmon_dev;
71
72         struct mutex update_lock;
73         enum chips type;
74         unsigned long last_updated;     /* In jiffies */
75         char has_temp3;         /* !=0 if it is ADM1022 in temp3 mode */
76         char valid;             /* !=0 if following fields are valid */
77
78         /* Register values */
79         s8 temp_input[3];
80         s8 temp_max[3];
81         s8 temp_min[3];
82         s8 temp_critical[3];
83         u8 analog_out;
84         u8 alarms;
85 };
86
87 static int thmc50_detect(struct i2c_client *client,
88                          struct i2c_board_info *info);
89 static int thmc50_probe(struct i2c_client *client,
90                         const struct i2c_device_id *id);
91 static int thmc50_remove(struct i2c_client *client);
92 static void thmc50_init_client(struct i2c_client *client);
93 static struct thmc50_data *thmc50_update_device(struct device *dev);
94
95 static const struct i2c_device_id thmc50_id[] = {
96         { "adm1022", adm1022 },
97         { "thmc50", thmc50 },
98         { }
99 };
100 MODULE_DEVICE_TABLE(i2c, thmc50_id);
101
102 static struct i2c_driver thmc50_driver = {
103         .class = I2C_CLASS_HWMON,
104         .driver = {
105                 .name = "thmc50",
106         },
107         .probe = thmc50_probe,
108         .remove = thmc50_remove,
109         .id_table = thmc50_id,
110         .detect = thmc50_detect,
111         .address_list = normal_i2c,
112 };
113
114 static ssize_t show_analog_out(struct device *dev,
115                                struct device_attribute *attr, char *buf)
116 {
117         struct thmc50_data *data = thmc50_update_device(dev);
118         return sprintf(buf, "%d\n", data->analog_out);
119 }
120
121 static ssize_t set_analog_out(struct device *dev,
122                               struct device_attribute *attr,
123                               const char *buf, size_t count)
124 {
125         struct i2c_client *client = to_i2c_client(dev);
126         struct thmc50_data *data = i2c_get_clientdata(client);
127         int config;
128         unsigned long tmp;
129         int err;
130
131         err = kstrtoul(buf, 10, &tmp);
132         if (err)
133                 return err;
134
135         mutex_lock(&data->update_lock);
136         data->analog_out = SENSORS_LIMIT(tmp, 0, 255);
137         i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT,
138                                   data->analog_out);
139
140         config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
141         if (data->analog_out == 0)
142                 config &= ~THMC50_REG_CONF_nFANOFF;
143         else
144                 config |= THMC50_REG_CONF_nFANOFF;
145         i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config);
146
147         mutex_unlock(&data->update_lock);
148         return count;
149 }
150
151 /* There is only one PWM mode = DC */
152 static ssize_t show_pwm_mode(struct device *dev, struct device_attribute *attr,
153                              char *buf)
154 {
155         return sprintf(buf, "0\n");
156 }
157
158 /* Temperatures */
159 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
160                          char *buf)
161 {
162         int nr = to_sensor_dev_attr(attr)->index;
163         struct thmc50_data *data = thmc50_update_device(dev);
164         return sprintf(buf, "%d\n", data->temp_input[nr] * 1000);
165 }
166
167 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
168                              char *buf)
169 {
170         int nr = to_sensor_dev_attr(attr)->index;
171         struct thmc50_data *data = thmc50_update_device(dev);
172         return sprintf(buf, "%d\n", data->temp_min[nr] * 1000);
173 }
174
175 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
176                             const char *buf, size_t count)
177 {
178         int nr = to_sensor_dev_attr(attr)->index;
179         struct i2c_client *client = to_i2c_client(dev);
180         struct thmc50_data *data = i2c_get_clientdata(client);
181         long val;
182         int err;
183
184         err = kstrtol(buf, 10, &val);
185         if (err)
186                 return err;
187
188         mutex_lock(&data->update_lock);
189         data->temp_min[nr] = SENSORS_LIMIT(val / 1000, -128, 127);
190         i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MIN[nr],
191                                   data->temp_min[nr]);
192         mutex_unlock(&data->update_lock);
193         return count;
194 }
195
196 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
197                              char *buf)
198 {
199         int nr = to_sensor_dev_attr(attr)->index;
200         struct thmc50_data *data = thmc50_update_device(dev);
201         return sprintf(buf, "%d\n", data->temp_max[nr] * 1000);
202 }
203
204 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
205                             const char *buf, size_t count)
206 {
207         int nr = to_sensor_dev_attr(attr)->index;
208         struct i2c_client *client = to_i2c_client(dev);
209         struct thmc50_data *data = i2c_get_clientdata(client);
210         long val;
211         int err;
212
213         err = kstrtol(buf, 10, &val);
214         if (err)
215                 return err;
216
217         mutex_lock(&data->update_lock);
218         data->temp_max[nr] = SENSORS_LIMIT(val / 1000, -128, 127);
219         i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MAX[nr],
220                                   data->temp_max[nr]);
221         mutex_unlock(&data->update_lock);
222         return count;
223 }
224
225 static ssize_t show_temp_critical(struct device *dev,
226                                   struct device_attribute *attr,
227                                   char *buf)
228 {
229         int nr = to_sensor_dev_attr(attr)->index;
230         struct thmc50_data *data = thmc50_update_device(dev);
231         return sprintf(buf, "%d\n", data->temp_critical[nr] * 1000);
232 }
233
234 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
235                           char *buf)
236 {
237         int index = to_sensor_dev_attr(attr)->index;
238         struct thmc50_data *data = thmc50_update_device(dev);
239
240         return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
241 }
242
243 #define temp_reg(offset)                                                \
244 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp,     \
245                         NULL, offset - 1);                              \
246 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR,        \
247                         show_temp_min, set_temp_min, offset - 1);       \
248 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,        \
249                         show_temp_max, set_temp_max, offset - 1);       \
250 static SENSOR_DEVICE_ATTR(temp##offset##_crit, S_IRUGO,                 \
251                         show_temp_critical, NULL, offset - 1);
252
253 temp_reg(1);
254 temp_reg(2);
255 temp_reg(3);
256
257 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 0);
258 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
259 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 1);
260 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 7);
261 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2);
262
263 static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_analog_out,
264                           set_analog_out, 0);
265 static SENSOR_DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL, 0);
266
267 static struct attribute *thmc50_attributes[] = {
268         &sensor_dev_attr_temp1_max.dev_attr.attr,
269         &sensor_dev_attr_temp1_min.dev_attr.attr,
270         &sensor_dev_attr_temp1_input.dev_attr.attr,
271         &sensor_dev_attr_temp1_crit.dev_attr.attr,
272         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
273         &sensor_dev_attr_temp2_max.dev_attr.attr,
274         &sensor_dev_attr_temp2_min.dev_attr.attr,
275         &sensor_dev_attr_temp2_input.dev_attr.attr,
276         &sensor_dev_attr_temp2_crit.dev_attr.attr,
277         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
278         &sensor_dev_attr_temp2_fault.dev_attr.attr,
279         &sensor_dev_attr_pwm1.dev_attr.attr,
280         &sensor_dev_attr_pwm1_mode.dev_attr.attr,
281         NULL
282 };
283
284 static const struct attribute_group thmc50_group = {
285         .attrs = thmc50_attributes,
286 };
287
288 /* for ADM1022 3rd temperature mode */
289 static struct attribute *temp3_attributes[] = {
290         &sensor_dev_attr_temp3_max.dev_attr.attr,
291         &sensor_dev_attr_temp3_min.dev_attr.attr,
292         &sensor_dev_attr_temp3_input.dev_attr.attr,
293         &sensor_dev_attr_temp3_crit.dev_attr.attr,
294         &sensor_dev_attr_temp3_alarm.dev_attr.attr,
295         &sensor_dev_attr_temp3_fault.dev_attr.attr,
296         NULL
297 };
298
299 static const struct attribute_group temp3_group = {
300         .attrs = temp3_attributes,
301 };
302
303 /* Return 0 if detection is successful, -ENODEV otherwise */
304 static int thmc50_detect(struct i2c_client *client,
305                          struct i2c_board_info *info)
306 {
307         unsigned company;
308         unsigned revision;
309         unsigned config;
310         struct i2c_adapter *adapter = client->adapter;
311         const char *type_name;
312
313         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
314                 pr_debug("thmc50: detect failed, "
315                          "smbus byte data not supported!\n");
316                 return -ENODEV;
317         }
318
319         pr_debug("thmc50: Probing for THMC50 at 0x%2X on bus %d\n",
320                  client->addr, i2c_adapter_id(client->adapter));
321
322         company = i2c_smbus_read_byte_data(client, THMC50_REG_COMPANY_ID);
323         revision = i2c_smbus_read_byte_data(client, THMC50_REG_DIE_CODE);
324         config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
325         if (revision < 0xc0 || (config & 0x10))
326                 return -ENODEV;
327
328         if (company == 0x41) {
329                 int id = i2c_adapter_id(client->adapter);
330                 int i;
331
332                 type_name = "adm1022";
333                 for (i = 0; i + 1 < adm1022_temp3_num; i += 2)
334                         if (adm1022_temp3[i] == id &&
335                             adm1022_temp3[i + 1] == client->addr) {
336                                 /* enable 2nd remote temp */
337                                 config |= (1 << 7);
338                                 i2c_smbus_write_byte_data(client,
339                                                           THMC50_REG_CONF,
340                                                           config);
341                                 break;
342                         }
343         } else if (company == 0x49) {
344                 type_name = "thmc50";
345         } else {
346                 pr_debug("thmc50: Detection of THMC50/ADM1022 failed\n");
347                 return -ENODEV;
348         }
349
350         pr_debug("thmc50: Detected %s (version %x, revision %x)\n",
351                  type_name, (revision >> 4) - 0xc, revision & 0xf);
352
353         strlcpy(info->type, type_name, I2C_NAME_SIZE);
354
355         return 0;
356 }
357
358 static int thmc50_probe(struct i2c_client *client,
359                         const struct i2c_device_id *id)
360 {
361         struct thmc50_data *data;
362         int err;
363
364         data = devm_kzalloc(&client->dev, sizeof(struct thmc50_data),
365                             GFP_KERNEL);
366         if (!data)
367                 return -ENOMEM;
368
369         i2c_set_clientdata(client, data);
370         data->type = id->driver_data;
371         mutex_init(&data->update_lock);
372
373         thmc50_init_client(client);
374
375         /* Register sysfs hooks */
376         err = sysfs_create_group(&client->dev.kobj, &thmc50_group);
377         if (err)
378                 return err;
379
380         /* Register ADM1022 sysfs hooks */
381         if (data->has_temp3) {
382                 err = sysfs_create_group(&client->dev.kobj, &temp3_group);
383                 if (err)
384                         goto exit_remove_sysfs_thmc50;
385         }
386
387         /* Register a new directory entry with module sensors */
388         data->hwmon_dev = hwmon_device_register(&client->dev);
389         if (IS_ERR(data->hwmon_dev)) {
390                 err = PTR_ERR(data->hwmon_dev);
391                 goto exit_remove_sysfs;
392         }
393
394         return 0;
395
396 exit_remove_sysfs:
397         if (data->has_temp3)
398                 sysfs_remove_group(&client->dev.kobj, &temp3_group);
399 exit_remove_sysfs_thmc50:
400         sysfs_remove_group(&client->dev.kobj, &thmc50_group);
401         return err;
402 }
403
404 static int thmc50_remove(struct i2c_client *client)
405 {
406         struct thmc50_data *data = i2c_get_clientdata(client);
407
408         hwmon_device_unregister(data->hwmon_dev);
409         sysfs_remove_group(&client->dev.kobj, &thmc50_group);
410         if (data->has_temp3)
411                 sysfs_remove_group(&client->dev.kobj, &temp3_group);
412
413         return 0;
414 }
415
416 static void thmc50_init_client(struct i2c_client *client)
417 {
418         struct thmc50_data *data = i2c_get_clientdata(client);
419         int config;
420
421         data->analog_out = i2c_smbus_read_byte_data(client,
422                                                     THMC50_REG_ANALOG_OUT);
423         /* set up to at least 1 */
424         if (data->analog_out == 0) {
425                 data->analog_out = 1;
426                 i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT,
427                                           data->analog_out);
428         }
429         config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
430         config |= 0x1;  /* start the chip if it is in standby mode */
431         if (data->type == adm1022 && (config & (1 << 7)))
432                 data->has_temp3 = 1;
433         i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config);
434 }
435
436 static struct thmc50_data *thmc50_update_device(struct device *dev)
437 {
438         struct i2c_client *client = to_i2c_client(dev);
439         struct thmc50_data *data = i2c_get_clientdata(client);
440         int timeout = HZ / 5 + (data->type == thmc50 ? HZ : 0);
441
442         mutex_lock(&data->update_lock);
443
444         if (time_after(jiffies, data->last_updated + timeout)
445             || !data->valid) {
446
447                 int temps = data->has_temp3 ? 3 : 2;
448                 int i;
449                 int prog = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
450
451                 prog &= THMC50_REG_CONF_PROGRAMMED;
452
453                 for (i = 0; i < temps; i++) {
454                         data->temp_input[i] = i2c_smbus_read_byte_data(client,
455                                                 THMC50_REG_TEMP[i]);
456                         data->temp_max[i] = i2c_smbus_read_byte_data(client,
457                                                 THMC50_REG_TEMP_MAX[i]);
458                         data->temp_min[i] = i2c_smbus_read_byte_data(client,
459                                                 THMC50_REG_TEMP_MIN[i]);
460                         data->temp_critical[i] =
461                                 i2c_smbus_read_byte_data(client,
462                                         prog ? THMC50_REG_TEMP_CRITICAL[i]
463                                              : THMC50_REG_TEMP_DEFAULT[i]);
464                 }
465                 data->analog_out =
466                     i2c_smbus_read_byte_data(client, THMC50_REG_ANALOG_OUT);
467                 data->alarms =
468                     i2c_smbus_read_byte_data(client, THMC50_REG_INTR);
469                 data->last_updated = jiffies;
470                 data->valid = 1;
471         }
472
473         mutex_unlock(&data->update_lock);
474
475         return data;
476 }
477
478 module_i2c_driver(thmc50_driver);
479
480 MODULE_AUTHOR("Krzysztof Helt <krzysztof.h1@wp.pl>");
481 MODULE_DESCRIPTION("THMC50 driver");