Merge tag 'at91-dt-for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/mripard...
[firefly-linux-kernel-4.4.55.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 #include <linux/jiffies.h>
32
33 MODULE_LICENSE("GPL");
34
35 /* Addresses to scan */
36 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
37
38 /* Insmod parameters */
39 enum chips { thmc50, adm1022 };
40
41 static unsigned short adm1022_temp3[16];
42 static unsigned int adm1022_temp3_num;
43 module_param_array(adm1022_temp3, ushort, &adm1022_temp3_num, 0);
44 MODULE_PARM_DESC(adm1022_temp3,
45                  "List of adapter,address pairs to enable 3rd temperature (ADM1022 only)");
46
47 /* Many THMC50 constants specified below */
48
49 /* The THMC50 registers */
50 #define THMC50_REG_CONF                         0x40
51 #define THMC50_REG_COMPANY_ID                   0x3E
52 #define THMC50_REG_DIE_CODE                     0x3F
53 #define THMC50_REG_ANALOG_OUT                   0x19
54 /*
55  * The mirror status register cannot be used as
56  * reading it does not clear alarms.
57  */
58 #define THMC50_REG_INTR                         0x41
59
60 static const u8 THMC50_REG_TEMP[] = { 0x27, 0x26, 0x20 };
61 static const u8 THMC50_REG_TEMP_MIN[] = { 0x3A, 0x38, 0x2C };
62 static const u8 THMC50_REG_TEMP_MAX[] = { 0x39, 0x37, 0x2B };
63 static const u8 THMC50_REG_TEMP_CRITICAL[] = { 0x13, 0x14, 0x14 };
64 static const u8 THMC50_REG_TEMP_DEFAULT[] = { 0x17, 0x18, 0x18 };
65
66 #define THMC50_REG_CONF_nFANOFF                 0x20
67 #define THMC50_REG_CONF_PROGRAMMED              0x08
68
69 /* Each client has this additional data */
70 struct thmc50_data {
71         struct i2c_client *client;
72         const struct attribute_group *groups[3];
73
74         struct mutex update_lock;
75         enum chips type;
76         unsigned long last_updated;     /* In jiffies */
77         char has_temp3;         /* !=0 if it is ADM1022 in temp3 mode */
78         char valid;             /* !=0 if following fields are valid */
79
80         /* Register values */
81         s8 temp_input[3];
82         s8 temp_max[3];
83         s8 temp_min[3];
84         s8 temp_critical[3];
85         u8 analog_out;
86         u8 alarms;
87 };
88
89 static struct thmc50_data *thmc50_update_device(struct device *dev)
90 {
91         struct thmc50_data *data = dev_get_drvdata(dev);
92         struct i2c_client *client = data->client;
93         int timeout = HZ / 5 + (data->type == thmc50 ? HZ : 0);
94
95         mutex_lock(&data->update_lock);
96
97         if (time_after(jiffies, data->last_updated + timeout)
98             || !data->valid) {
99
100                 int temps = data->has_temp3 ? 3 : 2;
101                 int i;
102                 int prog = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
103
104                 prog &= THMC50_REG_CONF_PROGRAMMED;
105
106                 for (i = 0; i < temps; i++) {
107                         data->temp_input[i] = i2c_smbus_read_byte_data(client,
108                                                 THMC50_REG_TEMP[i]);
109                         data->temp_max[i] = i2c_smbus_read_byte_data(client,
110                                                 THMC50_REG_TEMP_MAX[i]);
111                         data->temp_min[i] = i2c_smbus_read_byte_data(client,
112                                                 THMC50_REG_TEMP_MIN[i]);
113                         data->temp_critical[i] =
114                                 i2c_smbus_read_byte_data(client,
115                                         prog ? THMC50_REG_TEMP_CRITICAL[i]
116                                              : THMC50_REG_TEMP_DEFAULT[i]);
117                 }
118                 data->analog_out =
119                     i2c_smbus_read_byte_data(client, THMC50_REG_ANALOG_OUT);
120                 data->alarms =
121                     i2c_smbus_read_byte_data(client, THMC50_REG_INTR);
122                 data->last_updated = jiffies;
123                 data->valid = 1;
124         }
125
126         mutex_unlock(&data->update_lock);
127
128         return data;
129 }
130
131 static ssize_t show_analog_out(struct device *dev,
132                                struct device_attribute *attr, char *buf)
133 {
134         struct thmc50_data *data = thmc50_update_device(dev);
135         return sprintf(buf, "%d\n", data->analog_out);
136 }
137
138 static ssize_t set_analog_out(struct device *dev,
139                               struct device_attribute *attr,
140                               const char *buf, size_t count)
141 {
142         struct thmc50_data *data = dev_get_drvdata(dev);
143         struct i2c_client *client = data->client;
144         int config;
145         unsigned long tmp;
146         int err;
147
148         err = kstrtoul(buf, 10, &tmp);
149         if (err)
150                 return err;
151
152         mutex_lock(&data->update_lock);
153         data->analog_out = clamp_val(tmp, 0, 255);
154         i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT,
155                                   data->analog_out);
156
157         config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
158         if (data->analog_out == 0)
159                 config &= ~THMC50_REG_CONF_nFANOFF;
160         else
161                 config |= THMC50_REG_CONF_nFANOFF;
162         i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config);
163
164         mutex_unlock(&data->update_lock);
165         return count;
166 }
167
168 /* There is only one PWM mode = DC */
169 static ssize_t show_pwm_mode(struct device *dev, struct device_attribute *attr,
170                              char *buf)
171 {
172         return sprintf(buf, "0\n");
173 }
174
175 /* Temperatures */
176 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
177                          char *buf)
178 {
179         int nr = to_sensor_dev_attr(attr)->index;
180         struct thmc50_data *data = thmc50_update_device(dev);
181         return sprintf(buf, "%d\n", data->temp_input[nr] * 1000);
182 }
183
184 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
185                              char *buf)
186 {
187         int nr = to_sensor_dev_attr(attr)->index;
188         struct thmc50_data *data = thmc50_update_device(dev);
189         return sprintf(buf, "%d\n", data->temp_min[nr] * 1000);
190 }
191
192 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
193                             const char *buf, size_t count)
194 {
195         int nr = to_sensor_dev_attr(attr)->index;
196         struct thmc50_data *data = dev_get_drvdata(dev);
197         struct i2c_client *client = data->client;
198         long val;
199         int err;
200
201         err = kstrtol(buf, 10, &val);
202         if (err)
203                 return err;
204
205         mutex_lock(&data->update_lock);
206         data->temp_min[nr] = clamp_val(val / 1000, -128, 127);
207         i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MIN[nr],
208                                   data->temp_min[nr]);
209         mutex_unlock(&data->update_lock);
210         return count;
211 }
212
213 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
214                              char *buf)
215 {
216         int nr = to_sensor_dev_attr(attr)->index;
217         struct thmc50_data *data = thmc50_update_device(dev);
218         return sprintf(buf, "%d\n", data->temp_max[nr] * 1000);
219 }
220
221 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
222                             const char *buf, size_t count)
223 {
224         int nr = to_sensor_dev_attr(attr)->index;
225         struct thmc50_data *data = dev_get_drvdata(dev);
226         struct i2c_client *client = data->client;
227         long val;
228         int err;
229
230         err = kstrtol(buf, 10, &val);
231         if (err)
232                 return err;
233
234         mutex_lock(&data->update_lock);
235         data->temp_max[nr] = clamp_val(val / 1000, -128, 127);
236         i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MAX[nr],
237                                   data->temp_max[nr]);
238         mutex_unlock(&data->update_lock);
239         return count;
240 }
241
242 static ssize_t show_temp_critical(struct device *dev,
243                                   struct device_attribute *attr,
244                                   char *buf)
245 {
246         int nr = to_sensor_dev_attr(attr)->index;
247         struct thmc50_data *data = thmc50_update_device(dev);
248         return sprintf(buf, "%d\n", data->temp_critical[nr] * 1000);
249 }
250
251 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
252                           char *buf)
253 {
254         int index = to_sensor_dev_attr(attr)->index;
255         struct thmc50_data *data = thmc50_update_device(dev);
256
257         return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
258 }
259
260 #define temp_reg(offset)                                                \
261 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp,     \
262                         NULL, offset - 1);                              \
263 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR,        \
264                         show_temp_min, set_temp_min, offset - 1);       \
265 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,        \
266                         show_temp_max, set_temp_max, offset - 1);       \
267 static SENSOR_DEVICE_ATTR(temp##offset##_crit, S_IRUGO,                 \
268                         show_temp_critical, NULL, offset - 1);
269
270 temp_reg(1);
271 temp_reg(2);
272 temp_reg(3);
273
274 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 0);
275 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
276 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 1);
277 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 7);
278 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2);
279
280 static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_analog_out,
281                           set_analog_out, 0);
282 static SENSOR_DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL, 0);
283
284 static struct attribute *thmc50_attributes[] = {
285         &sensor_dev_attr_temp1_max.dev_attr.attr,
286         &sensor_dev_attr_temp1_min.dev_attr.attr,
287         &sensor_dev_attr_temp1_input.dev_attr.attr,
288         &sensor_dev_attr_temp1_crit.dev_attr.attr,
289         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
290         &sensor_dev_attr_temp2_max.dev_attr.attr,
291         &sensor_dev_attr_temp2_min.dev_attr.attr,
292         &sensor_dev_attr_temp2_input.dev_attr.attr,
293         &sensor_dev_attr_temp2_crit.dev_attr.attr,
294         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
295         &sensor_dev_attr_temp2_fault.dev_attr.attr,
296         &sensor_dev_attr_pwm1.dev_attr.attr,
297         &sensor_dev_attr_pwm1_mode.dev_attr.attr,
298         NULL
299 };
300
301 static const struct attribute_group thmc50_group = {
302         .attrs = thmc50_attributes,
303 };
304
305 /* for ADM1022 3rd temperature mode */
306 static struct attribute *temp3_attributes[] = {
307         &sensor_dev_attr_temp3_max.dev_attr.attr,
308         &sensor_dev_attr_temp3_min.dev_attr.attr,
309         &sensor_dev_attr_temp3_input.dev_attr.attr,
310         &sensor_dev_attr_temp3_crit.dev_attr.attr,
311         &sensor_dev_attr_temp3_alarm.dev_attr.attr,
312         &sensor_dev_attr_temp3_fault.dev_attr.attr,
313         NULL
314 };
315
316 static const struct attribute_group temp3_group = {
317         .attrs = temp3_attributes,
318 };
319
320 /* Return 0 if detection is successful, -ENODEV otherwise */
321 static int thmc50_detect(struct i2c_client *client,
322                          struct i2c_board_info *info)
323 {
324         unsigned company;
325         unsigned revision;
326         unsigned config;
327         struct i2c_adapter *adapter = client->adapter;
328         const char *type_name;
329
330         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
331                 pr_debug("thmc50: detect failed, smbus byte data not supported!\n");
332                 return -ENODEV;
333         }
334
335         pr_debug("thmc50: Probing for THMC50 at 0x%2X on bus %d\n",
336                  client->addr, i2c_adapter_id(client->adapter));
337
338         company = i2c_smbus_read_byte_data(client, THMC50_REG_COMPANY_ID);
339         revision = i2c_smbus_read_byte_data(client, THMC50_REG_DIE_CODE);
340         config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
341         if (revision < 0xc0 || (config & 0x10))
342                 return -ENODEV;
343
344         if (company == 0x41) {
345                 int id = i2c_adapter_id(client->adapter);
346                 int i;
347
348                 type_name = "adm1022";
349                 for (i = 0; i + 1 < adm1022_temp3_num; i += 2)
350                         if (adm1022_temp3[i] == id &&
351                             adm1022_temp3[i + 1] == client->addr) {
352                                 /* enable 2nd remote temp */
353                                 config |= (1 << 7);
354                                 i2c_smbus_write_byte_data(client,
355                                                           THMC50_REG_CONF,
356                                                           config);
357                                 break;
358                         }
359         } else if (company == 0x49) {
360                 type_name = "thmc50";
361         } else {
362                 pr_debug("thmc50: Detection of THMC50/ADM1022 failed\n");
363                 return -ENODEV;
364         }
365
366         pr_debug("thmc50: Detected %s (version %x, revision %x)\n",
367                  type_name, (revision >> 4) - 0xc, revision & 0xf);
368
369         strlcpy(info->type, type_name, I2C_NAME_SIZE);
370
371         return 0;
372 }
373
374 static void thmc50_init_client(struct thmc50_data *data)
375 {
376         struct i2c_client *client = data->client;
377         int config;
378
379         data->analog_out = i2c_smbus_read_byte_data(client,
380                                                     THMC50_REG_ANALOG_OUT);
381         /* set up to at least 1 */
382         if (data->analog_out == 0) {
383                 data->analog_out = 1;
384                 i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT,
385                                           data->analog_out);
386         }
387         config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
388         config |= 0x1;  /* start the chip if it is in standby mode */
389         if (data->type == adm1022 && (config & (1 << 7)))
390                 data->has_temp3 = 1;
391         i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config);
392 }
393
394 static int thmc50_probe(struct i2c_client *client,
395                         const struct i2c_device_id *id)
396 {
397         struct device *dev = &client->dev;
398         struct thmc50_data *data;
399         struct device *hwmon_dev;
400         int idx = 0;
401
402         data = devm_kzalloc(dev, sizeof(struct thmc50_data), GFP_KERNEL);
403         if (!data)
404                 return -ENOMEM;
405
406         data->client = client;
407         data->type = id->driver_data;
408         mutex_init(&data->update_lock);
409
410         thmc50_init_client(data);
411
412         /* sysfs hooks */
413         data->groups[idx++] = &thmc50_group;
414
415         /* Register additional ADM1022 sysfs hooks */
416         if (data->has_temp3)
417                 data->groups[idx++] = &temp3_group;
418
419         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
420                                                            data, data->groups);
421         return PTR_ERR_OR_ZERO(hwmon_dev);
422 }
423
424 static const struct i2c_device_id thmc50_id[] = {
425         { "adm1022", adm1022 },
426         { "thmc50", thmc50 },
427         { }
428 };
429 MODULE_DEVICE_TABLE(i2c, thmc50_id);
430
431 static struct i2c_driver thmc50_driver = {
432         .class = I2C_CLASS_HWMON,
433         .driver = {
434                 .name = "thmc50",
435         },
436         .probe = thmc50_probe,
437         .id_table = thmc50_id,
438         .detect = thmc50_detect,
439         .address_list = normal_i2c,
440 };
441
442 module_i2c_driver(thmc50_driver);
443
444 MODULE_AUTHOR("Krzysztof Helt <krzysztof.h1@wp.pl>");
445 MODULE_DESCRIPTION("THMC50 driver");