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1/*
2 * Copyright (c) 2012 Guenter Roeck <linux@roeck-us.net>
3 *
4 * based on max1668.c
5 * Copyright (c) 2011 David George <david.george@ska.ac.za>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 */
17
18#include <linux/module.h>
19#include <linux/init.h>
20#include <linux/slab.h>
21#include <linux/jiffies.h>
22#include <linux/i2c.h>
23#include <linux/hwmon.h>
24#include <linux/hwmon-sysfs.h>
25#include <linux/err.h>
26#include <linux/mutex.h>
27#include <linux/of.h>
28
29#include <linux/platform_data/max6697.h>
30
31enum chips { max6581, max6602, max6622, max6636, max6689, max6693, max6694,
32 max6697, max6698, max6699 };
33
34/* Report local sensor as temp1 */
35
36static const u8 MAX6697_REG_TEMP[] = {
37 0x07, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08 };
38static const u8 MAX6697_REG_TEMP_EXT[] = {
39 0x57, 0x09, 0x52, 0x53, 0x54, 0x55, 0x56, 0 };
40static const u8 MAX6697_REG_MAX[] = {
41 0x17, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x18 };
42static const u8 MAX6697_REG_CRIT[] = {
43 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27 };
44
45/*
46 * Map device tree / platform data register bit map to chip bit map.
47 * Applies to alert register and over-temperature register.
48 */
49#define MAX6697_MAP_BITS(reg) ((((reg) & 0x7e) >> 1) | \
50 (((reg) & 0x01) << 6) | ((reg) & 0x80))
51
52#define MAX6697_REG_STAT(n) (0x44 + (n))
53
54#define MAX6697_REG_CONFIG 0x41
55#define MAX6581_CONF_EXTENDED (1 << 1)
56#define MAX6693_CONF_BETA (1 << 2)
57#define MAX6697_CONF_RESISTANCE (1 << 3)
58#define MAX6697_CONF_TIMEOUT (1 << 5)
59#define MAX6697_REG_ALERT_MASK 0x42
60#define MAX6697_REG_OVERT_MASK 0x43
61
62#define MAX6581_REG_RESISTANCE 0x4a
63#define MAX6581_REG_IDEALITY 0x4b
64#define MAX6581_REG_IDEALITY_SELECT 0x4c
65#define MAX6581_REG_OFFSET 0x4d
66#define MAX6581_REG_OFFSET_SELECT 0x4e
67
68#define MAX6697_CONV_TIME 156 /* ms per channel, worst case */
69
70struct max6697_chip_data {
71 int channels;
72 u32 have_ext;
73 u32 have_crit;
74 u32 have_fault;
75 u8 valid_conf;
76 const u8 *alarm_map;
77};
78
79struct max6697_data {
80 struct i2c_client *client;
81
82 enum chips type;
83 const struct max6697_chip_data *chip;
84
85 int update_interval; /* in milli-seconds */
86 int temp_offset; /* in degrees C */
87
88 struct mutex update_lock;
89 unsigned long last_updated; /* In jiffies */
90 bool valid; /* true if following fields are valid */
91
92 /* 1x local and up to 7x remote */
93 u8 temp[8][4]; /* [nr][0]=temp [1]=ext [2]=max [3]=crit */
94#define MAX6697_TEMP_INPUT 0
95#define MAX6697_TEMP_EXT 1
96#define MAX6697_TEMP_MAX 2
97#define MAX6697_TEMP_CRIT 3
98 u32 alarms;
99};
100
101/* Diode fault status bits on MAX6581 are right shifted by one bit */
102static const u8 max6581_alarm_map[] = {
103 0, 0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15,
104 16, 17, 18, 19, 20, 21, 22, 23 };
105
106static const struct max6697_chip_data max6697_chip_data[] = {
107 [max6581] = {
108 .channels = 8,
109 .have_crit = 0xff,
110 .have_ext = 0x7f,
111 .have_fault = 0xfe,
112 .valid_conf = MAX6581_CONF_EXTENDED | MAX6697_CONF_TIMEOUT,
113 .alarm_map = max6581_alarm_map,
114 },
115 [max6602] = {
116 .channels = 5,
117 .have_crit = 0x12,
118 .have_ext = 0x02,
119 .have_fault = 0x1e,
120 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
121 },
122 [max6622] = {
123 .channels = 5,
124 .have_crit = 0x12,
125 .have_ext = 0x02,
126 .have_fault = 0x1e,
127 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
128 },
129 [max6636] = {
130 .channels = 7,
131 .have_crit = 0x72,
132 .have_ext = 0x02,
133 .have_fault = 0x7e,
134 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
135 },
136 [max6689] = {
137 .channels = 7,
138 .have_crit = 0x72,
139 .have_ext = 0x02,
140 .have_fault = 0x7e,
141 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
142 },
143 [max6693] = {
144 .channels = 7,
145 .have_crit = 0x72,
146 .have_ext = 0x02,
147 .have_fault = 0x7e,
148 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
149 MAX6697_CONF_TIMEOUT,
150 },
151 [max6694] = {
152 .channels = 5,
153 .have_crit = 0x12,
154 .have_ext = 0x02,
155 .have_fault = 0x1e,
156 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
157 MAX6697_CONF_TIMEOUT,
158 },
159 [max6697] = {
160 .channels = 7,
161 .have_crit = 0x72,
162 .have_ext = 0x02,
163 .have_fault = 0x7e,
164 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
165 },
166 [max6698] = {
167 .channels = 7,
168 .have_crit = 0x72,
169 .have_ext = 0x02,
170 .have_fault = 0x0e,
171 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
172 },
173 [max6699] = {
174 .channels = 5,
175 .have_crit = 0x12,
176 .have_ext = 0x02,
177 .have_fault = 0x1e,
178 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
179 },
180};
181
182static struct max6697_data *max6697_update_device(struct device *dev)
183{
184 struct max6697_data *data = dev_get_drvdata(dev);
185 struct i2c_client *client = data->client;
186 struct max6697_data *ret = data;
187 int val;
188 int i;
189 u32 alarms;
190
191 mutex_lock(&data->update_lock);
192
193 if (data->valid &&
194 !time_after(jiffies, data->last_updated
195 + msecs_to_jiffies(data->update_interval)))
196 goto abort;
197
198 for (i = 0; i < data->chip->channels; i++) {
199 if (data->chip->have_ext & (1 << i)) {
200 val = i2c_smbus_read_byte_data(client,
201 MAX6697_REG_TEMP_EXT[i]);
202 if (unlikely(val < 0)) {
203 ret = ERR_PTR(val);
204 goto abort;
205 }
206 data->temp[i][MAX6697_TEMP_EXT] = val;
207 }
208
209 val = i2c_smbus_read_byte_data(client, MAX6697_REG_TEMP[i]);
210 if (unlikely(val < 0)) {
211 ret = ERR_PTR(val);
212 goto abort;
213 }
214 data->temp[i][MAX6697_TEMP_INPUT] = val;
215
216 val = i2c_smbus_read_byte_data(client, MAX6697_REG_MAX[i]);
217 if (unlikely(val < 0)) {
218 ret = ERR_PTR(val);
219 goto abort;
220 }
221 data->temp[i][MAX6697_TEMP_MAX] = val;
222
223 if (data->chip->have_crit & (1 << i)) {
224 val = i2c_smbus_read_byte_data(client,
225 MAX6697_REG_CRIT[i]);
226 if (unlikely(val < 0)) {
227 ret = ERR_PTR(val);
228 goto abort;
229 }
230 data->temp[i][MAX6697_TEMP_CRIT] = val;
231 }
232 }
233
234 alarms = 0;
235 for (i = 0; i < 3; i++) {
236 val = i2c_smbus_read_byte_data(client, MAX6697_REG_STAT(i));
237 if (unlikely(val < 0)) {
238 ret = ERR_PTR(val);
239 goto abort;
240 }
241 alarms = (alarms << 8) | val;
242 }
243 data->alarms = alarms;
244 data->last_updated = jiffies;
245 data->valid = true;
246abort:
247 mutex_unlock(&data->update_lock);
248
249 return ret;
250}
251
252static ssize_t show_temp_input(struct device *dev,
253 struct device_attribute *devattr, char *buf)
254{
255 int index = to_sensor_dev_attr(devattr)->index;
256 struct max6697_data *data = max6697_update_device(dev);
257 int temp;
258
259 if (IS_ERR(data))
260 return PTR_ERR(data);
261
262 temp = (data->temp[index][MAX6697_TEMP_INPUT] - data->temp_offset) << 3;
263 temp |= data->temp[index][MAX6697_TEMP_EXT] >> 5;
264
265 return sprintf(buf, "%d\n", temp * 125);
266}
267
268static ssize_t show_temp(struct device *dev,
269 struct device_attribute *devattr, char *buf)
270{
271 int nr = to_sensor_dev_attr_2(devattr)->nr;
272 int index = to_sensor_dev_attr_2(devattr)->index;
273 struct max6697_data *data = max6697_update_device(dev);
274 int temp;
275
276 if (IS_ERR(data))
277 return PTR_ERR(data);
278
279 temp = data->temp[nr][index];
280 temp -= data->temp_offset;
281
282 return sprintf(buf, "%d\n", temp * 1000);
283}
284
285static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
286 char *buf)
287{
288 int index = to_sensor_dev_attr(attr)->index;
289 struct max6697_data *data = max6697_update_device(dev);
290
291 if (IS_ERR(data))
292 return PTR_ERR(data);
293
294 if (data->chip->alarm_map)
295 index = data->chip->alarm_map[index];
296
297 return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1);
298}
299
300static ssize_t set_temp(struct device *dev,
301 struct device_attribute *devattr,
302 const char *buf, size_t count)
303{
304 int nr = to_sensor_dev_attr_2(devattr)->nr;
305 int index = to_sensor_dev_attr_2(devattr)->index;
306 struct max6697_data *data = dev_get_drvdata(dev);
307 long temp;
308 int ret;
309
310 ret = kstrtol(buf, 10, &temp);
311 if (ret < 0)
312 return ret;
313
314 mutex_lock(&data->update_lock);
315 temp = DIV_ROUND_CLOSEST(temp, 1000) + data->temp_offset;
316 temp = clamp_val(temp, 0, data->type == max6581 ? 255 : 127);
317 data->temp[nr][index] = temp;
318 ret = i2c_smbus_write_byte_data(data->client,
319 index == 2 ? MAX6697_REG_MAX[nr]
320 : MAX6697_REG_CRIT[nr],
321 temp);
322 mutex_unlock(&data->update_lock);
323
324 return ret < 0 ? ret : count;
325}
326
327static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL, 0);
328static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
329 0, MAX6697_TEMP_MAX);
330static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
331 0, MAX6697_TEMP_CRIT);
332
333static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input, NULL, 1);
334static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
335 1, MAX6697_TEMP_MAX);
336static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
337 1, MAX6697_TEMP_CRIT);
338
339static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp_input, NULL, 2);
340static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
341 2, MAX6697_TEMP_MAX);
342static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
343 2, MAX6697_TEMP_CRIT);
344
345static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp_input, NULL, 3);
346static SENSOR_DEVICE_ATTR_2(temp4_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
347 3, MAX6697_TEMP_MAX);
348static SENSOR_DEVICE_ATTR_2(temp4_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
349 3, MAX6697_TEMP_CRIT);
350
351static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp_input, NULL, 4);
352static SENSOR_DEVICE_ATTR_2(temp5_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
353 4, MAX6697_TEMP_MAX);
354static SENSOR_DEVICE_ATTR_2(temp5_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
355 4, MAX6697_TEMP_CRIT);
356
357static SENSOR_DEVICE_ATTR(temp6_input, S_IRUGO, show_temp_input, NULL, 5);
358static SENSOR_DEVICE_ATTR_2(temp6_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
359 5, MAX6697_TEMP_MAX);
360static SENSOR_DEVICE_ATTR_2(temp6_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
361 5, MAX6697_TEMP_CRIT);
362
363static SENSOR_DEVICE_ATTR(temp7_input, S_IRUGO, show_temp_input, NULL, 6);
364static SENSOR_DEVICE_ATTR_2(temp7_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
365 6, MAX6697_TEMP_MAX);
366static SENSOR_DEVICE_ATTR_2(temp7_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
367 6, MAX6697_TEMP_CRIT);
368
369static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, show_temp_input, NULL, 7);
370static SENSOR_DEVICE_ATTR_2(temp8_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
371 7, MAX6697_TEMP_MAX);
372static SENSOR_DEVICE_ATTR_2(temp8_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
373 7, MAX6697_TEMP_CRIT);
374
375static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 22);
376static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 16);
377static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 17);
378static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 18);
379static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL, 19);
380static SENSOR_DEVICE_ATTR(temp6_max_alarm, S_IRUGO, show_alarm, NULL, 20);
381static SENSOR_DEVICE_ATTR(temp7_max_alarm, S_IRUGO, show_alarm, NULL, 21);
382static SENSOR_DEVICE_ATTR(temp8_max_alarm, S_IRUGO, show_alarm, NULL, 23);
383
384static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 14);
385static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 8);
386static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
387static SENSOR_DEVICE_ATTR(temp4_crit_alarm, S_IRUGO, show_alarm, NULL, 10);
388static SENSOR_DEVICE_ATTR(temp5_crit_alarm, S_IRUGO, show_alarm, NULL, 11);
389static SENSOR_DEVICE_ATTR(temp6_crit_alarm, S_IRUGO, show_alarm, NULL, 12);
390static SENSOR_DEVICE_ATTR(temp7_crit_alarm, S_IRUGO, show_alarm, NULL, 13);
391static SENSOR_DEVICE_ATTR(temp8_crit_alarm, S_IRUGO, show_alarm, NULL, 15);
392
393static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 1);
394static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2);
395static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL, 3);
396static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_alarm, NULL, 4);
397static SENSOR_DEVICE_ATTR(temp6_fault, S_IRUGO, show_alarm, NULL, 5);
398static SENSOR_DEVICE_ATTR(temp7_fault, S_IRUGO, show_alarm, NULL, 6);
399static SENSOR_DEVICE_ATTR(temp8_fault, S_IRUGO, show_alarm, NULL, 7);
400
401static DEVICE_ATTR(dummy, 0, NULL, NULL);
402
403static umode_t max6697_is_visible(struct kobject *kobj, struct attribute *attr,
404 int index)
405{
406 struct device *dev = container_of(kobj, struct device, kobj);
407 struct max6697_data *data = dev_get_drvdata(dev);
408 const struct max6697_chip_data *chip = data->chip;
409 int channel = index / 6; /* channel number */
410 int nr = index % 6; /* attribute index within channel */
411
412 if (channel >= chip->channels)
413 return 0;
414
415 if ((nr == 3 || nr == 4) && !(chip->have_crit & (1 << channel)))
416 return 0;
417 if (nr == 5 && !(chip->have_fault & (1 << channel)))
418 return 0;
419
420 return attr->mode;
421}
422
423/*
424 * max6697_is_visible uses the index into the following array to determine
425 * if attributes should be created or not. Any change in order or content
426 * must be matched in max6697_is_visible.
427 */
428static struct attribute *max6697_attributes[] = {
429 &sensor_dev_attr_temp1_input.dev_attr.attr,
430 &sensor_dev_attr_temp1_max.dev_attr.attr,
431 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
432 &sensor_dev_attr_temp1_crit.dev_attr.attr,
433 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
434 &dev_attr_dummy.attr,
435
436 &sensor_dev_attr_temp2_input.dev_attr.attr,
437 &sensor_dev_attr_temp2_max.dev_attr.attr,
438 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
439 &sensor_dev_attr_temp2_crit.dev_attr.attr,
440 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
441 &sensor_dev_attr_temp2_fault.dev_attr.attr,
442
443 &sensor_dev_attr_temp3_input.dev_attr.attr,
444 &sensor_dev_attr_temp3_max.dev_attr.attr,
445 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
446 &sensor_dev_attr_temp3_crit.dev_attr.attr,
447 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
448 &sensor_dev_attr_temp3_fault.dev_attr.attr,
449
450 &sensor_dev_attr_temp4_input.dev_attr.attr,
451 &sensor_dev_attr_temp4_max.dev_attr.attr,
452 &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
453 &sensor_dev_attr_temp4_crit.dev_attr.attr,
454 &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
455 &sensor_dev_attr_temp4_fault.dev_attr.attr,
456
457 &sensor_dev_attr_temp5_input.dev_attr.attr,
458 &sensor_dev_attr_temp5_max.dev_attr.attr,
459 &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
460 &sensor_dev_attr_temp5_crit.dev_attr.attr,
461 &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
462 &sensor_dev_attr_temp5_fault.dev_attr.attr,
463
464 &sensor_dev_attr_temp6_input.dev_attr.attr,
465 &sensor_dev_attr_temp6_max.dev_attr.attr,
466 &sensor_dev_attr_temp6_max_alarm.dev_attr.attr,
467 &sensor_dev_attr_temp6_crit.dev_attr.attr,
468 &sensor_dev_attr_temp6_crit_alarm.dev_attr.attr,
469 &sensor_dev_attr_temp6_fault.dev_attr.attr,
470
471 &sensor_dev_attr_temp7_input.dev_attr.attr,
472 &sensor_dev_attr_temp7_max.dev_attr.attr,
473 &sensor_dev_attr_temp7_max_alarm.dev_attr.attr,
474 &sensor_dev_attr_temp7_crit.dev_attr.attr,
475 &sensor_dev_attr_temp7_crit_alarm.dev_attr.attr,
476 &sensor_dev_attr_temp7_fault.dev_attr.attr,
477
478 &sensor_dev_attr_temp8_input.dev_attr.attr,
479 &sensor_dev_attr_temp8_max.dev_attr.attr,
480 &sensor_dev_attr_temp8_max_alarm.dev_attr.attr,
481 &sensor_dev_attr_temp8_crit.dev_attr.attr,
482 &sensor_dev_attr_temp8_crit_alarm.dev_attr.attr,
483 &sensor_dev_attr_temp8_fault.dev_attr.attr,
484 NULL
485};
486
487static const struct attribute_group max6697_group = {
488 .attrs = max6697_attributes, .is_visible = max6697_is_visible,
489};
490__ATTRIBUTE_GROUPS(max6697);
491
492static void max6697_get_config_of(struct device_node *node,
493 struct max6697_platform_data *pdata)
494{
495 int len;
496 const __be32 *prop;
497
498 pdata->smbus_timeout_disable =
499 of_property_read_bool(node, "smbus-timeout-disable");
500 pdata->extended_range_enable =
501 of_property_read_bool(node, "extended-range-enable");
502 pdata->beta_compensation =
503 of_property_read_bool(node, "beta-compensation-enable");
504
505 prop = of_get_property(node, "alert-mask", &len);
506 if (prop && len == sizeof(u32))
507 pdata->alert_mask = be32_to_cpu(prop[0]);
508 prop = of_get_property(node, "over-temperature-mask", &len);
509 if (prop && len == sizeof(u32))
510 pdata->over_temperature_mask = be32_to_cpu(prop[0]);
511 prop = of_get_property(node, "resistance-cancellation", &len);
512 if (prop) {
513 if (len == sizeof(u32))
514 pdata->resistance_cancellation = be32_to_cpu(prop[0]);
515 else
516 pdata->resistance_cancellation = 0xfe;
517 }
518 prop = of_get_property(node, "transistor-ideality", &len);
519 if (prop && len == 2 * sizeof(u32)) {
520 pdata->ideality_mask = be32_to_cpu(prop[0]);
521 pdata->ideality_value = be32_to_cpu(prop[1]);
522 }
523}
524
525static int max6697_init_chip(struct max6697_data *data,
526 struct i2c_client *client)
527{
528 struct max6697_platform_data *pdata = dev_get_platdata(&client->dev);
529 struct max6697_platform_data p;
530 const struct max6697_chip_data *chip = data->chip;
531 int factor = chip->channels;
532 int ret, reg;
533
534 /*
535 * Don't touch configuration if neither platform data nor OF
536 * configuration was specified. If that is the case, use the
537 * current chip configuration.
538 */
539 if (!pdata && !client->dev.of_node) {
540 reg = i2c_smbus_read_byte_data(client, MAX6697_REG_CONFIG);
541 if (reg < 0)
542 return reg;
543 if (data->type == max6581) {
544 if (reg & MAX6581_CONF_EXTENDED)
545 data->temp_offset = 64;
546 reg = i2c_smbus_read_byte_data(client,
547 MAX6581_REG_RESISTANCE);
548 if (reg < 0)
549 return reg;
550 factor += hweight8(reg);
551 } else {
552 if (reg & MAX6697_CONF_RESISTANCE)
553 factor++;
554 }
555 goto done;
556 }
557
558 if (client->dev.of_node) {
559 memset(&p, 0, sizeof(p));
560 max6697_get_config_of(client->dev.of_node, &p);
561 pdata = &p;
562 }
563
564 reg = 0;
565 if (pdata->smbus_timeout_disable &&
566 (chip->valid_conf & MAX6697_CONF_TIMEOUT)) {
567 reg |= MAX6697_CONF_TIMEOUT;
568 }
569 if (pdata->extended_range_enable &&
570 (chip->valid_conf & MAX6581_CONF_EXTENDED)) {
571 reg |= MAX6581_CONF_EXTENDED;
572 data->temp_offset = 64;
573 }
574 if (pdata->resistance_cancellation &&
575 (chip->valid_conf & MAX6697_CONF_RESISTANCE)) {
576 reg |= MAX6697_CONF_RESISTANCE;
577 factor++;
578 }
579 if (pdata->beta_compensation &&
580 (chip->valid_conf & MAX6693_CONF_BETA)) {
581 reg |= MAX6693_CONF_BETA;
582 }
583
584 ret = i2c_smbus_write_byte_data(client, MAX6697_REG_CONFIG, reg);
585 if (ret < 0)
586 return ret;
587
588 ret = i2c_smbus_write_byte_data(client, MAX6697_REG_ALERT_MASK,
589 MAX6697_MAP_BITS(pdata->alert_mask));
590 if (ret < 0)
591 return ret;
592
593 ret = i2c_smbus_write_byte_data(client, MAX6697_REG_OVERT_MASK,
594 MAX6697_MAP_BITS(pdata->over_temperature_mask));
595 if (ret < 0)
596 return ret;
597
598 if (data->type == max6581) {
599 factor += hweight8(pdata->resistance_cancellation >> 1);
600 ret = i2c_smbus_write_byte_data(client, MAX6581_REG_RESISTANCE,
601 pdata->resistance_cancellation >> 1);
602 if (ret < 0)
603 return ret;
604 ret = i2c_smbus_write_byte_data(client, MAX6581_REG_IDEALITY,
605 pdata->ideality_value);
606 if (ret < 0)
607 return ret;
608 ret = i2c_smbus_write_byte_data(client,
609 MAX6581_REG_IDEALITY_SELECT,
610 pdata->ideality_mask >> 1);
611 if (ret < 0)
612 return ret;
613 }
614done:
615 data->update_interval = factor * MAX6697_CONV_TIME;
616 return 0;
617}
618
619static int max6697_probe(struct i2c_client *client,
620 const struct i2c_device_id *id)
621{
622 struct i2c_adapter *adapter = client->adapter;
623 struct device *dev = &client->dev;
624 struct max6697_data *data;
625 struct device *hwmon_dev;
626 int err;
627
628 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
629 return -ENODEV;
630
631 data = devm_kzalloc(dev, sizeof(struct max6697_data), GFP_KERNEL);
632 if (!data)
633 return -ENOMEM;
634
635 data->type = id->driver_data;
636 data->chip = &max6697_chip_data[data->type];
637 data->client = client;
638 mutex_init(&data->update_lock);
639
640 err = max6697_init_chip(data, client);
641 if (err)
642 return err;
643
644 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
645 data,
646 max6697_groups);
647 return PTR_ERR_OR_ZERO(hwmon_dev);
648}
649
650static const struct i2c_device_id max6697_id[] = {
651 { "max6581", max6581 },
652 { "max6602", max6602 },
653 { "max6622", max6622 },
654 { "max6636", max6636 },
655 { "max6689", max6689 },
656 { "max6693", max6693 },
657 { "max6694", max6694 },
658 { "max6697", max6697 },
659 { "max6698", max6698 },
660 { "max6699", max6699 },
661 { }
662};
663MODULE_DEVICE_TABLE(i2c, max6697_id);
664
665static struct i2c_driver max6697_driver = {
666 .class = I2C_CLASS_HWMON,
667 .driver = {
668 .name = "max6697",
669 },
670 .probe = max6697_probe,
671 .id_table = max6697_id,
672};
673
674module_i2c_driver(max6697_driver);
675
676MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
677MODULE_DESCRIPTION("MAX6697 temperature sensor driver");
678MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2012 Guenter Roeck <linux@roeck-us.net>
4 *
5 * based on max1668.c
6 * Copyright (c) 2011 David George <david.george@ska.ac.za>
7 */
8
9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/slab.h>
12#include <linux/jiffies.h>
13#include <linux/i2c.h>
14#include <linux/hwmon.h>
15#include <linux/hwmon-sysfs.h>
16#include <linux/err.h>
17#include <linux/mutex.h>
18#include <linux/of_device.h>
19#include <linux/of.h>
20
21#include <linux/platform_data/max6697.h>
22
23enum chips { max6581, max6602, max6622, max6636, max6689, max6693, max6694,
24 max6697, max6698, max6699 };
25
26/* Report local sensor as temp1 */
27
28static const u8 MAX6697_REG_TEMP[] = {
29 0x07, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08 };
30static const u8 MAX6697_REG_TEMP_EXT[] = {
31 0x57, 0x09, 0x52, 0x53, 0x54, 0x55, 0x56, 0 };
32static const u8 MAX6697_REG_MAX[] = {
33 0x17, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x18 };
34static const u8 MAX6697_REG_CRIT[] = {
35 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27 };
36
37/*
38 * Map device tree / platform data register bit map to chip bit map.
39 * Applies to alert register and over-temperature register.
40 */
41#define MAX6697_MAP_BITS(reg) ((((reg) & 0x7e) >> 1) | \
42 (((reg) & 0x01) << 6) | ((reg) & 0x80))
43
44#define MAX6697_REG_STAT(n) (0x44 + (n))
45
46#define MAX6697_REG_CONFIG 0x41
47#define MAX6581_CONF_EXTENDED (1 << 1)
48#define MAX6693_CONF_BETA (1 << 2)
49#define MAX6697_CONF_RESISTANCE (1 << 3)
50#define MAX6697_CONF_TIMEOUT (1 << 5)
51#define MAX6697_REG_ALERT_MASK 0x42
52#define MAX6697_REG_OVERT_MASK 0x43
53
54#define MAX6581_REG_RESISTANCE 0x4a
55#define MAX6581_REG_IDEALITY 0x4b
56#define MAX6581_REG_IDEALITY_SELECT 0x4c
57#define MAX6581_REG_OFFSET 0x4d
58#define MAX6581_REG_OFFSET_SELECT 0x4e
59
60#define MAX6697_CONV_TIME 156 /* ms per channel, worst case */
61
62struct max6697_chip_data {
63 int channels;
64 u32 have_ext;
65 u32 have_crit;
66 u32 have_fault;
67 u8 valid_conf;
68 const u8 *alarm_map;
69};
70
71struct max6697_data {
72 struct i2c_client *client;
73
74 enum chips type;
75 const struct max6697_chip_data *chip;
76
77 int update_interval; /* in milli-seconds */
78 int temp_offset; /* in degrees C */
79
80 struct mutex update_lock;
81 unsigned long last_updated; /* In jiffies */
82 bool valid; /* true if following fields are valid */
83
84 /* 1x local and up to 7x remote */
85 u8 temp[8][4]; /* [nr][0]=temp [1]=ext [2]=max [3]=crit */
86#define MAX6697_TEMP_INPUT 0
87#define MAX6697_TEMP_EXT 1
88#define MAX6697_TEMP_MAX 2
89#define MAX6697_TEMP_CRIT 3
90 u32 alarms;
91};
92
93/* Diode fault status bits on MAX6581 are right shifted by one bit */
94static const u8 max6581_alarm_map[] = {
95 0, 0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15,
96 16, 17, 18, 19, 20, 21, 22, 23 };
97
98static const struct max6697_chip_data max6697_chip_data[] = {
99 [max6581] = {
100 .channels = 8,
101 .have_crit = 0xff,
102 .have_ext = 0x7f,
103 .have_fault = 0xfe,
104 .valid_conf = MAX6581_CONF_EXTENDED | MAX6697_CONF_TIMEOUT,
105 .alarm_map = max6581_alarm_map,
106 },
107 [max6602] = {
108 .channels = 5,
109 .have_crit = 0x12,
110 .have_ext = 0x02,
111 .have_fault = 0x1e,
112 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
113 },
114 [max6622] = {
115 .channels = 5,
116 .have_crit = 0x12,
117 .have_ext = 0x02,
118 .have_fault = 0x1e,
119 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
120 },
121 [max6636] = {
122 .channels = 7,
123 .have_crit = 0x72,
124 .have_ext = 0x02,
125 .have_fault = 0x7e,
126 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
127 },
128 [max6689] = {
129 .channels = 7,
130 .have_crit = 0x72,
131 .have_ext = 0x02,
132 .have_fault = 0x7e,
133 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
134 },
135 [max6693] = {
136 .channels = 7,
137 .have_crit = 0x72,
138 .have_ext = 0x02,
139 .have_fault = 0x7e,
140 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
141 MAX6697_CONF_TIMEOUT,
142 },
143 [max6694] = {
144 .channels = 5,
145 .have_crit = 0x12,
146 .have_ext = 0x02,
147 .have_fault = 0x1e,
148 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
149 MAX6697_CONF_TIMEOUT,
150 },
151 [max6697] = {
152 .channels = 7,
153 .have_crit = 0x72,
154 .have_ext = 0x02,
155 .have_fault = 0x7e,
156 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
157 },
158 [max6698] = {
159 .channels = 7,
160 .have_crit = 0x72,
161 .have_ext = 0x02,
162 .have_fault = 0x0e,
163 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
164 },
165 [max6699] = {
166 .channels = 5,
167 .have_crit = 0x12,
168 .have_ext = 0x02,
169 .have_fault = 0x1e,
170 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
171 },
172};
173
174static struct max6697_data *max6697_update_device(struct device *dev)
175{
176 struct max6697_data *data = dev_get_drvdata(dev);
177 struct i2c_client *client = data->client;
178 struct max6697_data *ret = data;
179 int val;
180 int i;
181 u32 alarms;
182
183 mutex_lock(&data->update_lock);
184
185 if (data->valid &&
186 !time_after(jiffies, data->last_updated
187 + msecs_to_jiffies(data->update_interval)))
188 goto abort;
189
190 for (i = 0; i < data->chip->channels; i++) {
191 if (data->chip->have_ext & (1 << i)) {
192 val = i2c_smbus_read_byte_data(client,
193 MAX6697_REG_TEMP_EXT[i]);
194 if (unlikely(val < 0)) {
195 ret = ERR_PTR(val);
196 goto abort;
197 }
198 data->temp[i][MAX6697_TEMP_EXT] = val;
199 }
200
201 val = i2c_smbus_read_byte_data(client, MAX6697_REG_TEMP[i]);
202 if (unlikely(val < 0)) {
203 ret = ERR_PTR(val);
204 goto abort;
205 }
206 data->temp[i][MAX6697_TEMP_INPUT] = val;
207
208 val = i2c_smbus_read_byte_data(client, MAX6697_REG_MAX[i]);
209 if (unlikely(val < 0)) {
210 ret = ERR_PTR(val);
211 goto abort;
212 }
213 data->temp[i][MAX6697_TEMP_MAX] = val;
214
215 if (data->chip->have_crit & (1 << i)) {
216 val = i2c_smbus_read_byte_data(client,
217 MAX6697_REG_CRIT[i]);
218 if (unlikely(val < 0)) {
219 ret = ERR_PTR(val);
220 goto abort;
221 }
222 data->temp[i][MAX6697_TEMP_CRIT] = val;
223 }
224 }
225
226 alarms = 0;
227 for (i = 0; i < 3; i++) {
228 val = i2c_smbus_read_byte_data(client, MAX6697_REG_STAT(i));
229 if (unlikely(val < 0)) {
230 ret = ERR_PTR(val);
231 goto abort;
232 }
233 alarms = (alarms << 8) | val;
234 }
235 data->alarms = alarms;
236 data->last_updated = jiffies;
237 data->valid = true;
238abort:
239 mutex_unlock(&data->update_lock);
240
241 return ret;
242}
243
244static ssize_t temp_input_show(struct device *dev,
245 struct device_attribute *devattr, char *buf)
246{
247 int index = to_sensor_dev_attr(devattr)->index;
248 struct max6697_data *data = max6697_update_device(dev);
249 int temp;
250
251 if (IS_ERR(data))
252 return PTR_ERR(data);
253
254 temp = (data->temp[index][MAX6697_TEMP_INPUT] - data->temp_offset) << 3;
255 temp |= data->temp[index][MAX6697_TEMP_EXT] >> 5;
256
257 return sprintf(buf, "%d\n", temp * 125);
258}
259
260static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
261 char *buf)
262{
263 int nr = to_sensor_dev_attr_2(devattr)->nr;
264 int index = to_sensor_dev_attr_2(devattr)->index;
265 struct max6697_data *data = max6697_update_device(dev);
266 int temp;
267
268 if (IS_ERR(data))
269 return PTR_ERR(data);
270
271 temp = data->temp[nr][index];
272 temp -= data->temp_offset;
273
274 return sprintf(buf, "%d\n", temp * 1000);
275}
276
277static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
278 char *buf)
279{
280 int index = to_sensor_dev_attr(attr)->index;
281 struct max6697_data *data = max6697_update_device(dev);
282
283 if (IS_ERR(data))
284 return PTR_ERR(data);
285
286 if (data->chip->alarm_map)
287 index = data->chip->alarm_map[index];
288
289 return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1);
290}
291
292static ssize_t temp_store(struct device *dev,
293 struct device_attribute *devattr, const char *buf,
294 size_t count)
295{
296 int nr = to_sensor_dev_attr_2(devattr)->nr;
297 int index = to_sensor_dev_attr_2(devattr)->index;
298 struct max6697_data *data = dev_get_drvdata(dev);
299 long temp;
300 int ret;
301
302 ret = kstrtol(buf, 10, &temp);
303 if (ret < 0)
304 return ret;
305
306 mutex_lock(&data->update_lock);
307 temp = DIV_ROUND_CLOSEST(temp, 1000) + data->temp_offset;
308 temp = clamp_val(temp, 0, data->type == max6581 ? 255 : 127);
309 data->temp[nr][index] = temp;
310 ret = i2c_smbus_write_byte_data(data->client,
311 index == 2 ? MAX6697_REG_MAX[nr]
312 : MAX6697_REG_CRIT[nr],
313 temp);
314 mutex_unlock(&data->update_lock);
315
316 return ret < 0 ? ret : count;
317}
318
319static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
320static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0, MAX6697_TEMP_MAX);
321static SENSOR_DEVICE_ATTR_2_RW(temp1_crit, temp, 0, MAX6697_TEMP_CRIT);
322
323static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
324static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 1, MAX6697_TEMP_MAX);
325static SENSOR_DEVICE_ATTR_2_RW(temp2_crit, temp, 1, MAX6697_TEMP_CRIT);
326
327static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2);
328static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, MAX6697_TEMP_MAX);
329static SENSOR_DEVICE_ATTR_2_RW(temp3_crit, temp, 2, MAX6697_TEMP_CRIT);
330
331static SENSOR_DEVICE_ATTR_RO(temp4_input, temp_input, 3);
332static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 3, MAX6697_TEMP_MAX);
333static SENSOR_DEVICE_ATTR_2_RW(temp4_crit, temp, 3, MAX6697_TEMP_CRIT);
334
335static SENSOR_DEVICE_ATTR_RO(temp5_input, temp_input, 4);
336static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 4, MAX6697_TEMP_MAX);
337static SENSOR_DEVICE_ATTR_2_RW(temp5_crit, temp, 4, MAX6697_TEMP_CRIT);
338
339static SENSOR_DEVICE_ATTR_RO(temp6_input, temp_input, 5);
340static SENSOR_DEVICE_ATTR_2_RW(temp6_max, temp, 5, MAX6697_TEMP_MAX);
341static SENSOR_DEVICE_ATTR_2_RW(temp6_crit, temp, 5, MAX6697_TEMP_CRIT);
342
343static SENSOR_DEVICE_ATTR_RO(temp7_input, temp_input, 6);
344static SENSOR_DEVICE_ATTR_2_RW(temp7_max, temp, 6, MAX6697_TEMP_MAX);
345static SENSOR_DEVICE_ATTR_2_RW(temp7_crit, temp, 6, MAX6697_TEMP_CRIT);
346
347static SENSOR_DEVICE_ATTR_RO(temp8_input, temp_input, 7);
348static SENSOR_DEVICE_ATTR_2_RW(temp8_max, temp, 7, MAX6697_TEMP_MAX);
349static SENSOR_DEVICE_ATTR_2_RW(temp8_crit, temp, 7, MAX6697_TEMP_CRIT);
350
351static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 22);
352static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 16);
353static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, 17);
354static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, 18);
355static SENSOR_DEVICE_ATTR_RO(temp5_max_alarm, alarm, 19);
356static SENSOR_DEVICE_ATTR_RO(temp6_max_alarm, alarm, 20);
357static SENSOR_DEVICE_ATTR_RO(temp7_max_alarm, alarm, 21);
358static SENSOR_DEVICE_ATTR_RO(temp8_max_alarm, alarm, 23);
359
360static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 14);
361static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 8);
362static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, 9);
363static SENSOR_DEVICE_ATTR_RO(temp4_crit_alarm, alarm, 10);
364static SENSOR_DEVICE_ATTR_RO(temp5_crit_alarm, alarm, 11);
365static SENSOR_DEVICE_ATTR_RO(temp6_crit_alarm, alarm, 12);
366static SENSOR_DEVICE_ATTR_RO(temp7_crit_alarm, alarm, 13);
367static SENSOR_DEVICE_ATTR_RO(temp8_crit_alarm, alarm, 15);
368
369static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 1);
370static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2);
371static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, 3);
372static SENSOR_DEVICE_ATTR_RO(temp5_fault, alarm, 4);
373static SENSOR_DEVICE_ATTR_RO(temp6_fault, alarm, 5);
374static SENSOR_DEVICE_ATTR_RO(temp7_fault, alarm, 6);
375static SENSOR_DEVICE_ATTR_RO(temp8_fault, alarm, 7);
376
377static DEVICE_ATTR(dummy, 0, NULL, NULL);
378
379static umode_t max6697_is_visible(struct kobject *kobj, struct attribute *attr,
380 int index)
381{
382 struct device *dev = container_of(kobj, struct device, kobj);
383 struct max6697_data *data = dev_get_drvdata(dev);
384 const struct max6697_chip_data *chip = data->chip;
385 int channel = index / 6; /* channel number */
386 int nr = index % 6; /* attribute index within channel */
387
388 if (channel >= chip->channels)
389 return 0;
390
391 if ((nr == 3 || nr == 4) && !(chip->have_crit & (1 << channel)))
392 return 0;
393 if (nr == 5 && !(chip->have_fault & (1 << channel)))
394 return 0;
395
396 return attr->mode;
397}
398
399/*
400 * max6697_is_visible uses the index into the following array to determine
401 * if attributes should be created or not. Any change in order or content
402 * must be matched in max6697_is_visible.
403 */
404static struct attribute *max6697_attributes[] = {
405 &sensor_dev_attr_temp1_input.dev_attr.attr,
406 &sensor_dev_attr_temp1_max.dev_attr.attr,
407 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
408 &sensor_dev_attr_temp1_crit.dev_attr.attr,
409 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
410 &dev_attr_dummy.attr,
411
412 &sensor_dev_attr_temp2_input.dev_attr.attr,
413 &sensor_dev_attr_temp2_max.dev_attr.attr,
414 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
415 &sensor_dev_attr_temp2_crit.dev_attr.attr,
416 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
417 &sensor_dev_attr_temp2_fault.dev_attr.attr,
418
419 &sensor_dev_attr_temp3_input.dev_attr.attr,
420 &sensor_dev_attr_temp3_max.dev_attr.attr,
421 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
422 &sensor_dev_attr_temp3_crit.dev_attr.attr,
423 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
424 &sensor_dev_attr_temp3_fault.dev_attr.attr,
425
426 &sensor_dev_attr_temp4_input.dev_attr.attr,
427 &sensor_dev_attr_temp4_max.dev_attr.attr,
428 &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
429 &sensor_dev_attr_temp4_crit.dev_attr.attr,
430 &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
431 &sensor_dev_attr_temp4_fault.dev_attr.attr,
432
433 &sensor_dev_attr_temp5_input.dev_attr.attr,
434 &sensor_dev_attr_temp5_max.dev_attr.attr,
435 &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
436 &sensor_dev_attr_temp5_crit.dev_attr.attr,
437 &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
438 &sensor_dev_attr_temp5_fault.dev_attr.attr,
439
440 &sensor_dev_attr_temp6_input.dev_attr.attr,
441 &sensor_dev_attr_temp6_max.dev_attr.attr,
442 &sensor_dev_attr_temp6_max_alarm.dev_attr.attr,
443 &sensor_dev_attr_temp6_crit.dev_attr.attr,
444 &sensor_dev_attr_temp6_crit_alarm.dev_attr.attr,
445 &sensor_dev_attr_temp6_fault.dev_attr.attr,
446
447 &sensor_dev_attr_temp7_input.dev_attr.attr,
448 &sensor_dev_attr_temp7_max.dev_attr.attr,
449 &sensor_dev_attr_temp7_max_alarm.dev_attr.attr,
450 &sensor_dev_attr_temp7_crit.dev_attr.attr,
451 &sensor_dev_attr_temp7_crit_alarm.dev_attr.attr,
452 &sensor_dev_attr_temp7_fault.dev_attr.attr,
453
454 &sensor_dev_attr_temp8_input.dev_attr.attr,
455 &sensor_dev_attr_temp8_max.dev_attr.attr,
456 &sensor_dev_attr_temp8_max_alarm.dev_attr.attr,
457 &sensor_dev_attr_temp8_crit.dev_attr.attr,
458 &sensor_dev_attr_temp8_crit_alarm.dev_attr.attr,
459 &sensor_dev_attr_temp8_fault.dev_attr.attr,
460 NULL
461};
462
463static const struct attribute_group max6697_group = {
464 .attrs = max6697_attributes, .is_visible = max6697_is_visible,
465};
466__ATTRIBUTE_GROUPS(max6697);
467
468static void max6697_get_config_of(struct device_node *node,
469 struct max6697_platform_data *pdata)
470{
471 int len;
472 const __be32 *prop;
473
474 pdata->smbus_timeout_disable =
475 of_property_read_bool(node, "smbus-timeout-disable");
476 pdata->extended_range_enable =
477 of_property_read_bool(node, "extended-range-enable");
478 pdata->beta_compensation =
479 of_property_read_bool(node, "beta-compensation-enable");
480
481 prop = of_get_property(node, "alert-mask", &len);
482 if (prop && len == sizeof(u32))
483 pdata->alert_mask = be32_to_cpu(prop[0]);
484 prop = of_get_property(node, "over-temperature-mask", &len);
485 if (prop && len == sizeof(u32))
486 pdata->over_temperature_mask = be32_to_cpu(prop[0]);
487 prop = of_get_property(node, "resistance-cancellation", &len);
488 if (prop) {
489 if (len == sizeof(u32))
490 pdata->resistance_cancellation = be32_to_cpu(prop[0]);
491 else
492 pdata->resistance_cancellation = 0xfe;
493 }
494 prop = of_get_property(node, "transistor-ideality", &len);
495 if (prop && len == 2 * sizeof(u32)) {
496 pdata->ideality_mask = be32_to_cpu(prop[0]);
497 pdata->ideality_value = be32_to_cpu(prop[1]);
498 }
499}
500
501static int max6697_init_chip(struct max6697_data *data,
502 struct i2c_client *client)
503{
504 struct max6697_platform_data *pdata = dev_get_platdata(&client->dev);
505 struct max6697_platform_data p;
506 const struct max6697_chip_data *chip = data->chip;
507 int factor = chip->channels;
508 int ret, reg;
509
510 /*
511 * Don't touch configuration if neither platform data nor OF
512 * configuration was specified. If that is the case, use the
513 * current chip configuration.
514 */
515 if (!pdata && !client->dev.of_node) {
516 reg = i2c_smbus_read_byte_data(client, MAX6697_REG_CONFIG);
517 if (reg < 0)
518 return reg;
519 if (data->type == max6581) {
520 if (reg & MAX6581_CONF_EXTENDED)
521 data->temp_offset = 64;
522 reg = i2c_smbus_read_byte_data(client,
523 MAX6581_REG_RESISTANCE);
524 if (reg < 0)
525 return reg;
526 factor += hweight8(reg);
527 } else {
528 if (reg & MAX6697_CONF_RESISTANCE)
529 factor++;
530 }
531 goto done;
532 }
533
534 if (client->dev.of_node) {
535 memset(&p, 0, sizeof(p));
536 max6697_get_config_of(client->dev.of_node, &p);
537 pdata = &p;
538 }
539
540 reg = 0;
541 if (pdata->smbus_timeout_disable &&
542 (chip->valid_conf & MAX6697_CONF_TIMEOUT)) {
543 reg |= MAX6697_CONF_TIMEOUT;
544 }
545 if (pdata->extended_range_enable &&
546 (chip->valid_conf & MAX6581_CONF_EXTENDED)) {
547 reg |= MAX6581_CONF_EXTENDED;
548 data->temp_offset = 64;
549 }
550 if (pdata->resistance_cancellation &&
551 (chip->valid_conf & MAX6697_CONF_RESISTANCE)) {
552 reg |= MAX6697_CONF_RESISTANCE;
553 factor++;
554 }
555 if (pdata->beta_compensation &&
556 (chip->valid_conf & MAX6693_CONF_BETA)) {
557 reg |= MAX6693_CONF_BETA;
558 }
559
560 ret = i2c_smbus_write_byte_data(client, MAX6697_REG_CONFIG, reg);
561 if (ret < 0)
562 return ret;
563
564 ret = i2c_smbus_write_byte_data(client, MAX6697_REG_ALERT_MASK,
565 MAX6697_MAP_BITS(pdata->alert_mask));
566 if (ret < 0)
567 return ret;
568
569 ret = i2c_smbus_write_byte_data(client, MAX6697_REG_OVERT_MASK,
570 MAX6697_MAP_BITS(pdata->over_temperature_mask));
571 if (ret < 0)
572 return ret;
573
574 if (data->type == max6581) {
575 factor += hweight8(pdata->resistance_cancellation >> 1);
576 ret = i2c_smbus_write_byte_data(client, MAX6581_REG_RESISTANCE,
577 pdata->resistance_cancellation >> 1);
578 if (ret < 0)
579 return ret;
580 ret = i2c_smbus_write_byte_data(client, MAX6581_REG_IDEALITY,
581 pdata->ideality_value);
582 if (ret < 0)
583 return ret;
584 ret = i2c_smbus_write_byte_data(client,
585 MAX6581_REG_IDEALITY_SELECT,
586 pdata->ideality_mask >> 1);
587 if (ret < 0)
588 return ret;
589 }
590done:
591 data->update_interval = factor * MAX6697_CONV_TIME;
592 return 0;
593}
594
595static int max6697_probe(struct i2c_client *client,
596 const struct i2c_device_id *id)
597{
598 struct i2c_adapter *adapter = client->adapter;
599 struct device *dev = &client->dev;
600 struct max6697_data *data;
601 struct device *hwmon_dev;
602 int err;
603
604 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
605 return -ENODEV;
606
607 data = devm_kzalloc(dev, sizeof(struct max6697_data), GFP_KERNEL);
608 if (!data)
609 return -ENOMEM;
610
611 if (client->dev.of_node)
612 data->type = (enum chips)of_device_get_match_data(&client->dev);
613 else
614 data->type = id->driver_data;
615 data->chip = &max6697_chip_data[data->type];
616 data->client = client;
617 mutex_init(&data->update_lock);
618
619 err = max6697_init_chip(data, client);
620 if (err)
621 return err;
622
623 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
624 data,
625 max6697_groups);
626 return PTR_ERR_OR_ZERO(hwmon_dev);
627}
628
629static const struct i2c_device_id max6697_id[] = {
630 { "max6581", max6581 },
631 { "max6602", max6602 },
632 { "max6622", max6622 },
633 { "max6636", max6636 },
634 { "max6689", max6689 },
635 { "max6693", max6693 },
636 { "max6694", max6694 },
637 { "max6697", max6697 },
638 { "max6698", max6698 },
639 { "max6699", max6699 },
640 { }
641};
642MODULE_DEVICE_TABLE(i2c, max6697_id);
643
644static const struct of_device_id __maybe_unused max6697_of_match[] = {
645 {
646 .compatible = "maxim,max6581",
647 .data = (void *)max6581
648 },
649 {
650 .compatible = "maxim,max6602",
651 .data = (void *)max6602
652 },
653 {
654 .compatible = "maxim,max6622",
655 .data = (void *)max6622
656 },
657 {
658 .compatible = "maxim,max6636",
659 .data = (void *)max6636
660 },
661 {
662 .compatible = "maxim,max6689",
663 .data = (void *)max6689
664 },
665 {
666 .compatible = "maxim,max6693",
667 .data = (void *)max6693
668 },
669 {
670 .compatible = "maxim,max6694",
671 .data = (void *)max6694
672 },
673 {
674 .compatible = "maxim,max6697",
675 .data = (void *)max6697
676 },
677 {
678 .compatible = "maxim,max6698",
679 .data = (void *)max6698
680 },
681 {
682 .compatible = "maxim,max6699",
683 .data = (void *)max6699
684 },
685 { },
686};
687MODULE_DEVICE_TABLE(of, max6697_of_match);
688
689static struct i2c_driver max6697_driver = {
690 .class = I2C_CLASS_HWMON,
691 .driver = {
692 .name = "max6697",
693 .of_match_table = of_match_ptr(max6697_of_match),
694 },
695 .probe = max6697_probe,
696 .id_table = max6697_id,
697};
698
699module_i2c_driver(max6697_driver);
700
701MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
702MODULE_DESCRIPTION("MAX6697 temperature sensor driver");
703MODULE_LICENSE("GPL");