projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
powerpc/mm: Drop the unnecessary region check
[linux-2.6-block.git] / drivers / hwmon / max6697.c
CommitLineData
5372d2d7
GR		 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>
9e427083 27#include <linux/of_device.h>
5372d2d7
GR		 28#include <linux/of.h>
29
30#include <linux/platform_data/max6697.h>
31
32enum chips { max6581, max6602, max6622, max6636, max6689, max6693, max6694,
33 max6697, max6698, max6699 };
34
35/* Report local sensor as temp1 */
36
37static const u8 MAX6697_REG_TEMP[] = {
38 0x07, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08 };
39static const u8 MAX6697_REG_TEMP_EXT[] = {
40 0x57, 0x09, 0x52, 0x53, 0x54, 0x55, 0x56, 0 };
41static const u8 MAX6697_REG_MAX[] = {
42 0x17, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x18 };
43static const u8 MAX6697_REG_CRIT[] = {
44 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27 };
45
46/*
47 * Map device tree / platform data register bit map to chip bit map.
48 * Applies to alert register and over-temperature register.
49 */
50#define MAX6697_MAP_BITS(reg) ((((reg) & 0x7e) >> 1) | \
51 (((reg) & 0x01) << 6) | ((reg) & 0x80))
52
53#define MAX6697_REG_STAT(n) (0x44 + (n))
54
55#define MAX6697_REG_CONFIG 0x41
56#define MAX6581_CONF_EXTENDED (1 << 1)
57#define MAX6693_CONF_BETA (1 << 2)
58#define MAX6697_CONF_RESISTANCE (1 << 3)
59#define MAX6697_CONF_TIMEOUT (1 << 5)
60#define MAX6697_REG_ALERT_MASK 0x42
61#define MAX6697_REG_OVERT_MASK 0x43
62
63#define MAX6581_REG_RESISTANCE 0x4a
64#define MAX6581_REG_IDEALITY 0x4b
65#define MAX6581_REG_IDEALITY_SELECT 0x4c
66#define MAX6581_REG_OFFSET 0x4d
67#define MAX6581_REG_OFFSET_SELECT 0x4e
68
69#define MAX6697_CONV_TIME 156 /* ms per channel, worst case */
70
71struct max6697_chip_data {
72 int channels;
73 u32 have_ext;
74 u32 have_crit;
75 u32 have_fault;
76 u8 valid_conf;
77 const u8 *alarm_map;
78};
79
80struct max6697_data {
8d373552 81 struct i2c_client *client;
5372d2d7
GR		 82
83 enum chips type;
84 const struct max6697_chip_data *chip;
85
86 int update_interval; /* in milli-seconds */
87 int temp_offset; /* in degrees C */
88
89 struct mutex update_lock;
90 unsigned long last_updated; /* In jiffies */
91 bool valid; /* true if following fields are valid */
92
93 /* 1x local and up to 7x remote */
94 u8 temp[8][4]; /* [nr][0]=temp [1]=ext [2]=max [3]=crit */
95#define MAX6697_TEMP_INPUT 0
96#define MAX6697_TEMP_EXT 1
97#define MAX6697_TEMP_MAX 2
98#define MAX6697_TEMP_CRIT 3
99 u32 alarms;
100};
101
102/* Diode fault status bits on MAX6581 are right shifted by one bit */
103static const u8 max6581_alarm_map[] = {
104 0, 0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15,
105 16, 17, 18, 19, 20, 21, 22, 23 };
106
107static const struct max6697_chip_data max6697_chip_data[] = {
108 [max6581] = {
109 .channels = 8,
110 .have_crit = 0xff,
111 .have_ext = 0x7f,
112 .have_fault = 0xfe,
113 .valid_conf = MAX6581_CONF_EXTENDED | MAX6697_CONF_TIMEOUT,
114 .alarm_map = max6581_alarm_map,
115 },
116 [max6602] = {
117 .channels = 5,
118 .have_crit = 0x12,
119 .have_ext = 0x02,
120 .have_fault = 0x1e,
121 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
122 },
123 [max6622] = {
124 .channels = 5,
125 .have_crit = 0x12,
126 .have_ext = 0x02,
127 .have_fault = 0x1e,
128 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
129 },
130 [max6636] = {
131 .channels = 7,
132 .have_crit = 0x72,
133 .have_ext = 0x02,
134 .have_fault = 0x7e,
135 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
136 },
137 [max6689] = {
138 .channels = 7,
139 .have_crit = 0x72,
140 .have_ext = 0x02,
141 .have_fault = 0x7e,
142 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
143 },
144 [max6693] = {
145 .channels = 7,
146 .have_crit = 0x72,
147 .have_ext = 0x02,
148 .have_fault = 0x7e,
149 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
150 MAX6697_CONF_TIMEOUT,
151 },
152 [max6694] = {
153 .channels = 5,
154 .have_crit = 0x12,
155 .have_ext = 0x02,
156 .have_fault = 0x1e,
157 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
158 MAX6697_CONF_TIMEOUT,
159 },
160 [max6697] = {
161 .channels = 7,
162 .have_crit = 0x72,
163 .have_ext = 0x02,
164 .have_fault = 0x7e,
165 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
166 },
167 [max6698] = {
168 .channels = 7,
169 .have_crit = 0x72,
170 .have_ext = 0x02,
171 .have_fault = 0x0e,
172 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
173 },
174 [max6699] = {
175 .channels = 5,
176 .have_crit = 0x12,
177 .have_ext = 0x02,
178 .have_fault = 0x1e,
179 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
180 },
181};
182
183static struct max6697_data *max6697_update_device(struct device *dev)
184{
8d373552
GR		 185 struct max6697_data *data = dev_get_drvdata(dev);
186 struct i2c_client *client = data->client;
5372d2d7
GR		 187 struct max6697_data *ret = data;
188 int val;
189 int i;
190 u32 alarms;
191
192 mutex_lock(&data->update_lock);
193
194 if (data->valid &&
195 !time_after(jiffies, data->last_updated
196 + msecs_to_jiffies(data->update_interval)))
197 goto abort;
198
199 for (i = 0; i < data->chip->channels; i++) {
200 if (data->chip->have_ext & (1 << i)) {
201 val = i2c_smbus_read_byte_data(client,
202 MAX6697_REG_TEMP_EXT[i]);
203 if (unlikely(val < 0)) {
204 ret = ERR_PTR(val);
205 goto abort;
206 }
207 data->temp[i][MAX6697_TEMP_EXT] = val;
208 }
209
210 val = i2c_smbus_read_byte_data(client, MAX6697_REG_TEMP[i]);
211 if (unlikely(val < 0)) {
212 ret = ERR_PTR(val);
213 goto abort;
214 }
215 data->temp[i][MAX6697_TEMP_INPUT] = val;
216
217 val = i2c_smbus_read_byte_data(client, MAX6697_REG_MAX[i]);
218 if (unlikely(val < 0)) {
219 ret = ERR_PTR(val);
220 goto abort;
221 }
222 data->temp[i][MAX6697_TEMP_MAX] = val;
223
224 if (data->chip->have_crit & (1 << i)) {
225 val = i2c_smbus_read_byte_data(client,
226 MAX6697_REG_CRIT[i]);
227 if (unlikely(val < 0)) {
228 ret = ERR_PTR(val);
229 goto abort;
230 }
231 data->temp[i][MAX6697_TEMP_CRIT] = val;
232 }
233 }
234
235 alarms = 0;
236 for (i = 0; i < 3; i++) {
237 val = i2c_smbus_read_byte_data(client, MAX6697_REG_STAT(i));
238 if (unlikely(val < 0)) {
239 ret = ERR_PTR(val);
240 goto abort;
241 }
242 alarms = (alarms << 8) | val;
243 }
244 data->alarms = alarms;
245 data->last_updated = jiffies;
246 data->valid = true;
247abort:
248 mutex_unlock(&data->update_lock);
249
250 return ret;
251}
252
740c2f2b 253static ssize_t temp_input_show(struct device *dev,
5372d2d7
GR		 254 struct device_attribute *devattr, char *buf)
255{
256 int index = to_sensor_dev_attr(devattr)->index;
257 struct max6697_data *data = max6697_update_device(dev);
258 int temp;
259
260 if (IS_ERR(data))
261 return PTR_ERR(data);
262
263 temp = (data->temp[index][MAX6697_TEMP_INPUT] - data->temp_offset) << 3;
264 temp |= data->temp[index][MAX6697_TEMP_EXT] >> 5;
265
266 return sprintf(buf, "%d\n", temp * 125);
267}
268
740c2f2b
GR		 269static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
270 char *buf)
5372d2d7
GR		 271{
272 int nr = to_sensor_dev_attr_2(devattr)->nr;
273 int index = to_sensor_dev_attr_2(devattr)->index;
274 struct max6697_data *data = max6697_update_device(dev);
275 int temp;
276
277 if (IS_ERR(data))
278 return PTR_ERR(data);
279
280 temp = data->temp[nr][index];
281 temp -= data->temp_offset;
282
283 return sprintf(buf, "%d\n", temp * 1000);
284}
285
740c2f2b 286static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
5372d2d7
GR		 287 char *buf)
288{
289 int index = to_sensor_dev_attr(attr)->index;
290 struct max6697_data *data = max6697_update_device(dev);
291
292 if (IS_ERR(data))
293 return PTR_ERR(data);
294
295 if (data->chip->alarm_map)
296 index = data->chip->alarm_map[index];
297
298 return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1);
299}
300
740c2f2b
GR		 301static ssize_t temp_store(struct device *dev,
302 struct device_attribute *devattr, const char *buf,
303 size_t count)
5372d2d7
GR		 304{
305 int nr = to_sensor_dev_attr_2(devattr)->nr;
306 int index = to_sensor_dev_attr_2(devattr)->index;
8d373552 307 struct max6697_data *data = dev_get_drvdata(dev);
5372d2d7
GR		 308 long temp;
309 int ret;
310
311 ret = kstrtol(buf, 10, &temp);
312 if (ret < 0)
313 return ret;
314
315 mutex_lock(&data->update_lock);
316 temp = DIV_ROUND_CLOSEST(temp, 1000) + data->temp_offset;
317 temp = clamp_val(temp, 0, data->type == max6581 ? 255 : 127);
318 data->temp[nr][index] = temp;
8d373552 319 ret = i2c_smbus_write_byte_data(data->client,
5372d2d7
GR		 320 index == 2 ? MAX6697_REG_MAX[nr]
321 : MAX6697_REG_CRIT[nr],
322 temp);
323 mutex_unlock(&data->update_lock);
324
325 return ret < 0 ? ret : count;
326}
327
740c2f2b
GR		 328static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
329static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0, MAX6697_TEMP_MAX);
330static SENSOR_DEVICE_ATTR_2_RW(temp1_crit, temp, 0, MAX6697_TEMP_CRIT);
331
332static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
333static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 1, MAX6697_TEMP_MAX);
334static SENSOR_DEVICE_ATTR_2_RW(temp2_crit, temp, 1, MAX6697_TEMP_CRIT);
335
336static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2);
337static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, MAX6697_TEMP_MAX);
338static SENSOR_DEVICE_ATTR_2_RW(temp3_crit, temp, 2, MAX6697_TEMP_CRIT);
339
340static SENSOR_DEVICE_ATTR_RO(temp4_input, temp_input, 3);
341static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 3, MAX6697_TEMP_MAX);
342static SENSOR_DEVICE_ATTR_2_RW(temp4_crit, temp, 3, MAX6697_TEMP_CRIT);
343
344static SENSOR_DEVICE_ATTR_RO(temp5_input, temp_input, 4);
345static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 4, MAX6697_TEMP_MAX);
346static SENSOR_DEVICE_ATTR_2_RW(temp5_crit, temp, 4, MAX6697_TEMP_CRIT);
347
348static SENSOR_DEVICE_ATTR_RO(temp6_input, temp_input, 5);
349static SENSOR_DEVICE_ATTR_2_RW(temp6_max, temp, 5, MAX6697_TEMP_MAX);
350static SENSOR_DEVICE_ATTR_2_RW(temp6_crit, temp, 5, MAX6697_TEMP_CRIT);
351
352static SENSOR_DEVICE_ATTR_RO(temp7_input, temp_input, 6);
353static SENSOR_DEVICE_ATTR_2_RW(temp7_max, temp, 6, MAX6697_TEMP_MAX);
354static SENSOR_DEVICE_ATTR_2_RW(temp7_crit, temp, 6, MAX6697_TEMP_CRIT);
355
356static SENSOR_DEVICE_ATTR_RO(temp8_input, temp_input, 7);
357static SENSOR_DEVICE_ATTR_2_RW(temp8_max, temp, 7, MAX6697_TEMP_MAX);
358static SENSOR_DEVICE_ATTR_2_RW(temp8_crit, temp, 7, MAX6697_TEMP_CRIT);
359
360static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 22);
361static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 16);
362static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, 17);
363static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, 18);
364static SENSOR_DEVICE_ATTR_RO(temp5_max_alarm, alarm, 19);
365static SENSOR_DEVICE_ATTR_RO(temp6_max_alarm, alarm, 20);
366static SENSOR_DEVICE_ATTR_RO(temp7_max_alarm, alarm, 21);
367static SENSOR_DEVICE_ATTR_RO(temp8_max_alarm, alarm, 23);
368
369static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 14);
370static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 8);
371static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, 9);
372static SENSOR_DEVICE_ATTR_RO(temp4_crit_alarm, alarm, 10);
373static SENSOR_DEVICE_ATTR_RO(temp5_crit_alarm, alarm, 11);
374static SENSOR_DEVICE_ATTR_RO(temp6_crit_alarm, alarm, 12);
375static SENSOR_DEVICE_ATTR_RO(temp7_crit_alarm, alarm, 13);
376static SENSOR_DEVICE_ATTR_RO(temp8_crit_alarm, alarm, 15);
377
378static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 1);
379static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2);
380static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, 3);
381static SENSOR_DEVICE_ATTR_RO(temp5_fault, alarm, 4);
382static SENSOR_DEVICE_ATTR_RO(temp6_fault, alarm, 5);
383static SENSOR_DEVICE_ATTR_RO(temp7_fault, alarm, 6);
384static SENSOR_DEVICE_ATTR_RO(temp8_fault, alarm, 7);
5372d2d7 385
6bf44ced
GR		 386static DEVICE_ATTR(dummy, 0, NULL, NULL);
387
388static umode_t max6697_is_visible(struct kobject *kobj, struct attribute *attr,
389 int index)
390{
391 struct device *dev = container_of(kobj, struct device, kobj);
8d373552 392 struct max6697_data *data = dev_get_drvdata(dev);
6bf44ced
GR		 393 const struct max6697_chip_data *chip = data->chip;
394 int channel = index / 6; /* channel number */
395 int nr = index % 6; /* attribute index within channel */
396
397 if (channel >= chip->channels)
398 return 0;
399
400 if ((nr == 3 || nr == 4) && !(chip->have_crit & (1 << channel)))
401 return 0;
402 if (nr == 5 && !(chip->have_fault & (1 << channel)))
403 return 0;
404
405 return attr->mode;
406}
407
408/*
409 * max6697_is_visible uses the index into the following array to determine
410 * if attributes should be created or not. Any change in order or content
411 * must be matched in max6697_is_visible.
412 */
413static struct attribute *max6697_attributes[] = {
414 &sensor_dev_attr_temp1_input.dev_attr.attr,
415 &sensor_dev_attr_temp1_max.dev_attr.attr,
416 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
417 &sensor_dev_attr_temp1_crit.dev_attr.attr,
418 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
419 &dev_attr_dummy.attr,
420
421 &sensor_dev_attr_temp2_input.dev_attr.attr,
422 &sensor_dev_attr_temp2_max.dev_attr.attr,
423 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
424 &sensor_dev_attr_temp2_crit.dev_attr.attr,
425 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
426 &sensor_dev_attr_temp2_fault.dev_attr.attr,
427
428 &sensor_dev_attr_temp3_input.dev_attr.attr,
429 &sensor_dev_attr_temp3_max.dev_attr.attr,
430 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
431 &sensor_dev_attr_temp3_crit.dev_attr.attr,
432 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
433 &sensor_dev_attr_temp3_fault.dev_attr.attr,
434
435 &sensor_dev_attr_temp4_input.dev_attr.attr,
436 &sensor_dev_attr_temp4_max.dev_attr.attr,
437 &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
438 &sensor_dev_attr_temp4_crit.dev_attr.attr,
439 &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
440 &sensor_dev_attr_temp4_fault.dev_attr.attr,
441
442 &sensor_dev_attr_temp5_input.dev_attr.attr,
443 &sensor_dev_attr_temp5_max.dev_attr.attr,
444 &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
445 &sensor_dev_attr_temp5_crit.dev_attr.attr,
446 &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
447 &sensor_dev_attr_temp5_fault.dev_attr.attr,
448
449 &sensor_dev_attr_temp6_input.dev_attr.attr,
450 &sensor_dev_attr_temp6_max.dev_attr.attr,
451 &sensor_dev_attr_temp6_max_alarm.dev_attr.attr,
452 &sensor_dev_attr_temp6_crit.dev_attr.attr,
453 &sensor_dev_attr_temp6_crit_alarm.dev_attr.attr,
454 &sensor_dev_attr_temp6_fault.dev_attr.attr,
455
456 &sensor_dev_attr_temp7_input.dev_attr.attr,
457 &sensor_dev_attr_temp7_max.dev_attr.attr,
458 &sensor_dev_attr_temp7_max_alarm.dev_attr.attr,
459 &sensor_dev_attr_temp7_crit.dev_attr.attr,
460 &sensor_dev_attr_temp7_crit_alarm.dev_attr.attr,
461 &sensor_dev_attr_temp7_fault.dev_attr.attr,
462
463 &sensor_dev_attr_temp8_input.dev_attr.attr,
464 &sensor_dev_attr_temp8_max.dev_attr.attr,
465 &sensor_dev_attr_temp8_max_alarm.dev_attr.attr,
466 &sensor_dev_attr_temp8_crit.dev_attr.attr,
467 &sensor_dev_attr_temp8_crit_alarm.dev_attr.attr,
468 &sensor_dev_attr_temp8_fault.dev_attr.attr,
469 NULL
5372d2d7
GR		 470};
471
6bf44ced
GR		 472static const struct attribute_group max6697_group = {
473 .attrs = max6697_attributes, .is_visible = max6697_is_visible,
5372d2d7 474};
8d373552 475__ATTRIBUTE_GROUPS(max6697);
5372d2d7
GR		 476
477static void max6697_get_config_of(struct device_node *node,
478 struct max6697_platform_data *pdata)
479{
480 int len;
481 const __be32 *prop;
482
8de2dcc9
AL		 483 pdata->smbus_timeout_disable =
484 of_property_read_bool(node, "smbus-timeout-disable");
485 pdata->extended_range_enable =
486 of_property_read_bool(node, "extended-range-enable");
487 pdata->beta_compensation =
488 of_property_read_bool(node, "beta-compensation-enable");
489
5372d2d7
GR		 490 prop = of_get_property(node, "alert-mask", &len);
491 if (prop && len == sizeof(u32))
492 pdata->alert_mask = be32_to_cpu(prop[0]);
493 prop = of_get_property(node, "over-temperature-mask", &len);
494 if (prop && len == sizeof(u32))
495 pdata->over_temperature_mask = be32_to_cpu(prop[0]);
496 prop = of_get_property(node, "resistance-cancellation", &len);
497 if (prop) {
498 if (len == sizeof(u32))
499 pdata->resistance_cancellation = be32_to_cpu(prop[0]);
500 else
501 pdata->resistance_cancellation = 0xfe;
502 }
503 prop = of_get_property(node, "transistor-ideality", &len);
504 if (prop && len == 2 * sizeof(u32)) {
505 pdata->ideality_mask = be32_to_cpu(prop[0]);
506 pdata->ideality_value = be32_to_cpu(prop[1]);
507 }
508}
509
8d373552
GR		 510static int max6697_init_chip(struct max6697_data *data,
511 struct i2c_client *client)
5372d2d7 512{
5372d2d7
GR		 513 struct max6697_platform_data *pdata = dev_get_platdata(&client->dev);
514 struct max6697_platform_data p;
515 const struct max6697_chip_data *chip = data->chip;
516 int factor = chip->channels;
517 int ret, reg;
518
519 /*
520 * Don't touch configuration if neither platform data nor OF
521 * configuration was specified. If that is the case, use the
522 * current chip configuration.
523 */
524 if (!pdata && !client->dev.of_node) {
525 reg = i2c_smbus_read_byte_data(client, MAX6697_REG_CONFIG);
526 if (reg < 0)
527 return reg;
528 if (data->type == max6581) {
529 if (reg & MAX6581_CONF_EXTENDED)
530 data->temp_offset = 64;
531 reg = i2c_smbus_read_byte_data(client,
532 MAX6581_REG_RESISTANCE);
533 if (reg < 0)
534 return reg;
535 factor += hweight8(reg);
536 } else {
537 if (reg & MAX6697_CONF_RESISTANCE)
538 factor++;
539 }
540 goto done;
541 }
542
543 if (client->dev.of_node) {
544 memset(&p, 0, sizeof(p));
545 max6697_get_config_of(client->dev.of_node, &p);
546 pdata = &p;
547 }
548
549 reg = 0;
550 if (pdata->smbus_timeout_disable &&
551 (chip->valid_conf & MAX6697_CONF_TIMEOUT)) {
552 reg |= MAX6697_CONF_TIMEOUT;
553 }
554 if (pdata->extended_range_enable &&
555 (chip->valid_conf & MAX6581_CONF_EXTENDED)) {
556 reg |= MAX6581_CONF_EXTENDED;
557 data->temp_offset = 64;
558 }
559 if (pdata->resistance_cancellation &&
560 (chip->valid_conf & MAX6697_CONF_RESISTANCE)) {
561 reg |= MAX6697_CONF_RESISTANCE;
562 factor++;
563 }
564 if (pdata->beta_compensation &&
565 (chip->valid_conf & MAX6693_CONF_BETA)) {
566 reg |= MAX6693_CONF_BETA;
567 }
568
569 ret = i2c_smbus_write_byte_data(client, MAX6697_REG_CONFIG, reg);
570 if (ret < 0)
571 return ret;
572
573 ret = i2c_smbus_write_byte_data(client, MAX6697_REG_ALERT_MASK,
574 MAX6697_MAP_BITS(pdata->alert_mask));
575 if (ret < 0)
576 return ret;
577
578 ret = i2c_smbus_write_byte_data(client, MAX6697_REG_OVERT_MASK,
579 MAX6697_MAP_BITS(pdata->over_temperature_mask));
580 if (ret < 0)
581 return ret;
582
583 if (data->type == max6581) {
584 factor += hweight8(pdata->resistance_cancellation >> 1);
585 ret = i2c_smbus_write_byte_data(client, MAX6581_REG_RESISTANCE,
586 pdata->resistance_cancellation >> 1);
587 if (ret < 0)
588 return ret;
589 ret = i2c_smbus_write_byte_data(client, MAX6581_REG_IDEALITY,
5c52add1 590 pdata->ideality_value);
5372d2d7
GR		 591 if (ret < 0)
592 return ret;
593 ret = i2c_smbus_write_byte_data(client,
594 MAX6581_REG_IDEALITY_SELECT,
5c52add1 595 pdata->ideality_mask >> 1);
5372d2d7
GR		 596 if (ret < 0)
597 return ret;
598 }
599done:
600 data->update_interval = factor * MAX6697_CONV_TIME;
601 return 0;
602}
603
5372d2d7
GR		 604static int max6697_probe(struct i2c_client *client,
605 const struct i2c_device_id *id)
606{
607 struct i2c_adapter *adapter = client->adapter;
608 struct device *dev = &client->dev;
609 struct max6697_data *data;
8d373552 610 struct device *hwmon_dev;
6bf44ced 611 int err;
5372d2d7
GR		 612
613 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
614 return -ENODEV;
615
616 data = devm_kzalloc(dev, sizeof(struct max6697_data), GFP_KERNEL);
617 if (!data)
618 return -ENOMEM;
619
9e427083
JMC		 620 if (client->dev.of_node)
621 data->type = (enum chips)of_device_get_match_data(&client->dev);
622 else
623 data->type = id->driver_data;
5372d2d7 624 data->chip = &max6697_chip_data[data->type];
8d373552 625 data->client = client;
5372d2d7
GR		 626 mutex_init(&data->update_lock);
627
8d373552 628 err = max6697_init_chip(data, client);
5372d2d7
GR		 629 if (err)
630 return err;
631
8d373552
GR		 632 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
633 data,
634 max6697_groups);
4109a716 635 return PTR_ERR_OR_ZERO(hwmon_dev);
5372d2d7
GR		 636}
637
638static const struct i2c_device_id max6697_id[] = {
639 { "max6581", max6581 },
640 { "max6602", max6602 },
641 { "max6622", max6622 },
642 { "max6636", max6636 },
643 { "max6689", max6689 },
644 { "max6693", max6693 },
645 { "max6694", max6694 },
646 { "max6697", max6697 },
647 { "max6698", max6698 },
648 { "max6699", max6699 },
649 { }
650};
651MODULE_DEVICE_TABLE(i2c, max6697_id);
652
9e427083
JMC		 653static const struct of_device_id max6697_of_match[] = {
654 {
655 .compatible = "maxim,max6581",
656 .data = (void *)max6581
657 },
658 {
659 .compatible = "maxim,max6602",
660 .data = (void *)max6602
661 },
662 {
663 .compatible = "maxim,max6622",
664 .data = (void *)max6622
665 },
666 {
667 .compatible = "maxim,max6636",
668 .data = (void *)max6636
669 },
670 {
671 .compatible = "maxim,max6689",
672 .data = (void *)max6689
673 },
674 {
675 .compatible = "maxim,max6693",
676 .data = (void *)max6693
677 },
678 {
679 .compatible = "maxim,max6694",
680 .data = (void *)max6694
681 },
682 {
683 .compatible = "maxim,max6697",
684 .data = (void *)max6697
685 },
686 {
687 .compatible = "maxim,max6698",
688 .data = (void *)max6698
689 },
690 {
691 .compatible = "maxim,max6699",
692 .data = (void *)max6699
693 },
694 { },
695};
696MODULE_DEVICE_TABLE(of, max6697_of_match);
697
5372d2d7
GR		 698static struct i2c_driver max6697_driver = {
699 .class = I2C_CLASS_HWMON,
700 .driver = {
701 .name = "max6697",
9e427083 702 .of_match_table = of_match_ptr(max6697_of_match),
5372d2d7
GR		 703 },
704 .probe = max6697_probe,
5372d2d7
GR		 705 .id_table = max6697_id,
706};
707
708module_i2c_driver(max6697_driver);
709
710MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
711MODULE_DESCRIPTION("MAX6697 temperature sensor driver");
712MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)