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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * max31790.c - Part of lm_sensors, Linux kernel modules for hardware
4 * monitoring.
5 *
6 * (C) 2015 by Il Han <corone.il.han@gmail.com>
7 */
8
9#include <linux/err.h>
10#include <linux/hwmon.h>
11#include <linux/i2c.h>
12#include <linux/init.h>
13#include <linux/jiffies.h>
14#include <linux/module.h>
15#include <linux/slab.h>
16
17/* MAX31790 registers */
18#define MAX31790_REG_GLOBAL_CONFIG 0x00
19#define MAX31790_REG_FAN_CONFIG(ch) (0x02 + (ch))
20#define MAX31790_REG_FAN_DYNAMICS(ch) (0x08 + (ch))
21#define MAX31790_REG_FAN_FAULT_STATUS2 0x10
22#define MAX31790_REG_FAN_FAULT_STATUS1 0x11
23#define MAX31790_REG_TACH_COUNT(ch) (0x18 + (ch) * 2)
24#define MAX31790_REG_PWM_DUTY_CYCLE(ch) (0x30 + (ch) * 2)
25#define MAX31790_REG_PWMOUT(ch) (0x40 + (ch) * 2)
26#define MAX31790_REG_TARGET_COUNT(ch) (0x50 + (ch) * 2)
27
28/* Fan Config register bits */
29#define MAX31790_FAN_CFG_RPM_MODE 0x80
30#define MAX31790_FAN_CFG_TACH_INPUT_EN 0x08
31#define MAX31790_FAN_CFG_TACH_INPUT 0x01
32
33/* Fan Dynamics register bits */
34#define MAX31790_FAN_DYN_SR_SHIFT 5
35#define MAX31790_FAN_DYN_SR_MASK 0xE0
36#define SR_FROM_REG(reg) (((reg) & MAX31790_FAN_DYN_SR_MASK) \
37 >> MAX31790_FAN_DYN_SR_SHIFT)
38
39#define FAN_RPM_MIN 120
40#define FAN_RPM_MAX 7864320
41
42#define RPM_FROM_REG(reg, sr) (((reg) >> 4) ? \
43 ((60 * (sr) * 8192) / ((reg) >> 4)) : \
44 FAN_RPM_MAX)
45#define RPM_TO_REG(rpm, sr) ((60 * (sr) * 8192) / ((rpm) * 2))
46
47#define NR_CHANNEL 6
48
49/*
50 * Client data (each client gets its own)
51 */
52struct max31790_data {
53 struct i2c_client *client;
54 struct mutex update_lock;
55 bool valid; /* zero until following fields are valid */
56 unsigned long last_updated; /* in jiffies */
57
58 /* register values */
59 u8 fan_config[NR_CHANNEL];
60 u8 fan_dynamics[NR_CHANNEL];
61 u16 fault_status;
62 u16 tach[NR_CHANNEL * 2];
63 u16 pwm[NR_CHANNEL];
64 u16 target_count[NR_CHANNEL];
65};
66
67static struct max31790_data *max31790_update_device(struct device *dev)
68{
69 struct max31790_data *data = dev_get_drvdata(dev);
70 struct i2c_client *client = data->client;
71 struct max31790_data *ret = data;
72 int i;
73 int rv;
74
75 mutex_lock(&data->update_lock);
76
77 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
78 rv = i2c_smbus_read_byte_data(client,
79 MAX31790_REG_FAN_FAULT_STATUS1);
80 if (rv < 0)
81 goto abort;
82 data->fault_status = rv & 0x3F;
83
84 rv = i2c_smbus_read_byte_data(client,
85 MAX31790_REG_FAN_FAULT_STATUS2);
86 if (rv < 0)
87 goto abort;
88 data->fault_status |= (rv & 0x3F) << 6;
89
90 for (i = 0; i < NR_CHANNEL; i++) {
91 rv = i2c_smbus_read_word_swapped(client,
92 MAX31790_REG_TACH_COUNT(i));
93 if (rv < 0)
94 goto abort;
95 data->tach[i] = rv;
96
97 if (data->fan_config[i]
98 & MAX31790_FAN_CFG_TACH_INPUT) {
99 rv = i2c_smbus_read_word_swapped(client,
100 MAX31790_REG_TACH_COUNT(NR_CHANNEL
101 + i));
102 if (rv < 0)
103 goto abort;
104 data->tach[NR_CHANNEL + i] = rv;
105 } else {
106 rv = i2c_smbus_read_word_swapped(client,
107 MAX31790_REG_PWMOUT(i));
108 if (rv < 0)
109 goto abort;
110 data->pwm[i] = rv;
111
112 rv = i2c_smbus_read_word_swapped(client,
113 MAX31790_REG_TARGET_COUNT(i));
114 if (rv < 0)
115 goto abort;
116 data->target_count[i] = rv;
117 }
118 }
119
120 data->last_updated = jiffies;
121 data->valid = true;
122 }
123 goto done;
124
125abort:
126 data->valid = false;
127 ret = ERR_PTR(rv);
128
129done:
130 mutex_unlock(&data->update_lock);
131
132 return ret;
133}
134
135static const u8 tach_period[8] = { 1, 2, 4, 8, 16, 32, 32, 32 };
136
137static u8 get_tach_period(u8 fan_dynamics)
138{
139 return tach_period[SR_FROM_REG(fan_dynamics)];
140}
141
142static u8 bits_for_tach_period(int rpm)
143{
144 u8 bits;
145
146 if (rpm < 500)
147 bits = 0x0;
148 else if (rpm < 1000)
149 bits = 0x1;
150 else if (rpm < 2000)
151 bits = 0x2;
152 else if (rpm < 4000)
153 bits = 0x3;
154 else if (rpm < 8000)
155 bits = 0x4;
156 else
157 bits = 0x5;
158
159 return bits;
160}
161
162static int max31790_read_fan(struct device *dev, u32 attr, int channel,
163 long *val)
164{
165 struct max31790_data *data = max31790_update_device(dev);
166 int sr, rpm;
167
168 if (IS_ERR(data))
169 return PTR_ERR(data);
170
171 switch (attr) {
172 case hwmon_fan_input:
173 sr = get_tach_period(data->fan_dynamics[channel]);
174 rpm = RPM_FROM_REG(data->tach[channel], sr);
175 *val = rpm;
176 return 0;
177 case hwmon_fan_target:
178 sr = get_tach_period(data->fan_dynamics[channel]);
179 rpm = RPM_FROM_REG(data->target_count[channel], sr);
180 *val = rpm;
181 return 0;
182 case hwmon_fan_fault:
183 *val = !!(data->fault_status & (1 << channel));
184 return 0;
185 default:
186 return -EOPNOTSUPP;
187 }
188}
189
190static int max31790_write_fan(struct device *dev, u32 attr, int channel,
191 long val)
192{
193 struct max31790_data *data = dev_get_drvdata(dev);
194 struct i2c_client *client = data->client;
195 int target_count;
196 int err = 0;
197 u8 bits;
198 int sr;
199
200 mutex_lock(&data->update_lock);
201
202 switch (attr) {
203 case hwmon_fan_target:
204 val = clamp_val(val, FAN_RPM_MIN, FAN_RPM_MAX);
205 bits = bits_for_tach_period(val);
206 data->fan_dynamics[channel] =
207 ((data->fan_dynamics[channel] &
208 ~MAX31790_FAN_DYN_SR_MASK) |
209 (bits << MAX31790_FAN_DYN_SR_SHIFT));
210 err = i2c_smbus_write_byte_data(client,
211 MAX31790_REG_FAN_DYNAMICS(channel),
212 data->fan_dynamics[channel]);
213 if (err < 0)
214 break;
215
216 sr = get_tach_period(data->fan_dynamics[channel]);
217 target_count = RPM_TO_REG(val, sr);
218 target_count = clamp_val(target_count, 0x1, 0x7FF);
219
220 data->target_count[channel] = target_count << 5;
221
222 err = i2c_smbus_write_word_swapped(client,
223 MAX31790_REG_TARGET_COUNT(channel),
224 data->target_count[channel]);
225 break;
226 default:
227 err = -EOPNOTSUPP;
228 break;
229 }
230
231 mutex_unlock(&data->update_lock);
232
233 return err;
234}
235
236static umode_t max31790_fan_is_visible(const void *_data, u32 attr, int channel)
237{
238 const struct max31790_data *data = _data;
239 u8 fan_config = data->fan_config[channel % NR_CHANNEL];
240
241 switch (attr) {
242 case hwmon_fan_input:
243 case hwmon_fan_fault:
244 if (channel < NR_CHANNEL ||
245 (fan_config & MAX31790_FAN_CFG_TACH_INPUT))
246 return 0444;
247 return 0;
248 case hwmon_fan_target:
249 if (channel < NR_CHANNEL &&
250 !(fan_config & MAX31790_FAN_CFG_TACH_INPUT))
251 return 0644;
252 return 0;
253 default:
254 return 0;
255 }
256}
257
258static int max31790_read_pwm(struct device *dev, u32 attr, int channel,
259 long *val)
260{
261 struct max31790_data *data = max31790_update_device(dev);
262 u8 fan_config;
263
264 if (IS_ERR(data))
265 return PTR_ERR(data);
266
267 fan_config = data->fan_config[channel];
268
269 switch (attr) {
270 case hwmon_pwm_input:
271 *val = data->pwm[channel] >> 8;
272 return 0;
273 case hwmon_pwm_enable:
274 if (fan_config & MAX31790_FAN_CFG_RPM_MODE)
275 *val = 2;
276 else if (fan_config & MAX31790_FAN_CFG_TACH_INPUT_EN)
277 *val = 1;
278 else
279 *val = 0;
280 return 0;
281 default:
282 return -EOPNOTSUPP;
283 }
284}
285
286static int max31790_write_pwm(struct device *dev, u32 attr, int channel,
287 long val)
288{
289 struct max31790_data *data = dev_get_drvdata(dev);
290 struct i2c_client *client = data->client;
291 u8 fan_config;
292 int err = 0;
293
294 mutex_lock(&data->update_lock);
295
296 switch (attr) {
297 case hwmon_pwm_input:
298 if (val < 0 || val > 255) {
299 err = -EINVAL;
300 break;
301 }
302 data->pwm[channel] = val << 8;
303 err = i2c_smbus_write_word_swapped(client,
304 MAX31790_REG_PWMOUT(channel),
305 data->pwm[channel]);
306 break;
307 case hwmon_pwm_enable:
308 fan_config = data->fan_config[channel];
309 if (val == 0) {
310 fan_config &= ~(MAX31790_FAN_CFG_TACH_INPUT_EN |
311 MAX31790_FAN_CFG_RPM_MODE);
312 } else if (val == 1) {
313 fan_config = (fan_config |
314 MAX31790_FAN_CFG_TACH_INPUT_EN) &
315 ~MAX31790_FAN_CFG_RPM_MODE;
316 } else if (val == 2) {
317 fan_config |= MAX31790_FAN_CFG_TACH_INPUT_EN |
318 MAX31790_FAN_CFG_RPM_MODE;
319 } else {
320 err = -EINVAL;
321 break;
322 }
323 data->fan_config[channel] = fan_config;
324 err = i2c_smbus_write_byte_data(client,
325 MAX31790_REG_FAN_CONFIG(channel),
326 fan_config);
327 break;
328 default:
329 err = -EOPNOTSUPP;
330 break;
331 }
332
333 mutex_unlock(&data->update_lock);
334
335 return err;
336}
337
338static umode_t max31790_pwm_is_visible(const void *_data, u32 attr, int channel)
339{
340 const struct max31790_data *data = _data;
341 u8 fan_config = data->fan_config[channel];
342
343 switch (attr) {
344 case hwmon_pwm_input:
345 case hwmon_pwm_enable:
346 if (!(fan_config & MAX31790_FAN_CFG_TACH_INPUT))
347 return 0644;
348 return 0;
349 default:
350 return 0;
351 }
352}
353
354static int max31790_read(struct device *dev, enum hwmon_sensor_types type,
355 u32 attr, int channel, long *val)
356{
357 switch (type) {
358 case hwmon_fan:
359 return max31790_read_fan(dev, attr, channel, val);
360 case hwmon_pwm:
361 return max31790_read_pwm(dev, attr, channel, val);
362 default:
363 return -EOPNOTSUPP;
364 }
365}
366
367static int max31790_write(struct device *dev, enum hwmon_sensor_types type,
368 u32 attr, int channel, long val)
369{
370 switch (type) {
371 case hwmon_fan:
372 return max31790_write_fan(dev, attr, channel, val);
373 case hwmon_pwm:
374 return max31790_write_pwm(dev, attr, channel, val);
375 default:
376 return -EOPNOTSUPP;
377 }
378}
379
380static umode_t max31790_is_visible(const void *data,
381 enum hwmon_sensor_types type,
382 u32 attr, int channel)
383{
384 switch (type) {
385 case hwmon_fan:
386 return max31790_fan_is_visible(data, attr, channel);
387 case hwmon_pwm:
388 return max31790_pwm_is_visible(data, attr, channel);
389 default:
390 return 0;
391 }
392}
393
394static const struct hwmon_channel_info *max31790_info[] = {
395 HWMON_CHANNEL_INFO(fan,
396 HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
397 HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
398 HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
399 HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
400 HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
401 HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
402 HWMON_F_INPUT | HWMON_F_FAULT,
403 HWMON_F_INPUT | HWMON_F_FAULT,
404 HWMON_F_INPUT | HWMON_F_FAULT,
405 HWMON_F_INPUT | HWMON_F_FAULT,
406 HWMON_F_INPUT | HWMON_F_FAULT,
407 HWMON_F_INPUT | HWMON_F_FAULT),
408 HWMON_CHANNEL_INFO(pwm,
409 HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
410 HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
411 HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
412 HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
413 HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
414 HWMON_PWM_INPUT | HWMON_PWM_ENABLE),
415 NULL
416};
417
418static const struct hwmon_ops max31790_hwmon_ops = {
419 .is_visible = max31790_is_visible,
420 .read = max31790_read,
421 .write = max31790_write,
422};
423
424static const struct hwmon_chip_info max31790_chip_info = {
425 .ops = &max31790_hwmon_ops,
426 .info = max31790_info,
427};
428
429static int max31790_init_client(struct i2c_client *client,
430 struct max31790_data *data)
431{
432 int i, rv;
433
434 for (i = 0; i < NR_CHANNEL; i++) {
435 rv = i2c_smbus_read_byte_data(client,
436 MAX31790_REG_FAN_CONFIG(i));
437 if (rv < 0)
438 return rv;
439 data->fan_config[i] = rv;
440
441 rv = i2c_smbus_read_byte_data(client,
442 MAX31790_REG_FAN_DYNAMICS(i));
443 if (rv < 0)
444 return rv;
445 data->fan_dynamics[i] = rv;
446 }
447
448 return 0;
449}
450
451static int max31790_probe(struct i2c_client *client,
452 const struct i2c_device_id *id)
453{
454 struct i2c_adapter *adapter = client->adapter;
455 struct device *dev = &client->dev;
456 struct max31790_data *data;
457 struct device *hwmon_dev;
458 int err;
459
460 if (!i2c_check_functionality(adapter,
461 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
462 return -ENODEV;
463
464 data = devm_kzalloc(dev, sizeof(struct max31790_data), GFP_KERNEL);
465 if (!data)
466 return -ENOMEM;
467
468 data->client = client;
469 mutex_init(&data->update_lock);
470
471 /*
472 * Initialize the max31790 chip
473 */
474 err = max31790_init_client(client, data);
475 if (err)
476 return err;
477
478 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
479 data,
480 &max31790_chip_info,
481 NULL);
482
483 return PTR_ERR_OR_ZERO(hwmon_dev);
484}
485
486static const struct i2c_device_id max31790_id[] = {
487 { "max31790", 0 },
488 { }
489};
490MODULE_DEVICE_TABLE(i2c, max31790_id);
491
492static struct i2c_driver max31790_driver = {
493 .class = I2C_CLASS_HWMON,
494 .probe = max31790_probe,
495 .driver = {
496 .name = "max31790",
497 },
498 .id_table = max31790_id,
499};
500
501module_i2c_driver(max31790_driver);
502
503MODULE_AUTHOR("Il Han <corone.il.han@gmail.com>");
504MODULE_DESCRIPTION("MAX31790 sensor driver");
505MODULE_LICENSE("GPL");
1/*
2 * max31790.c - Part of lm_sensors, Linux kernel modules for hardware
3 * monitoring.
4 *
5 * (C) 2015 by Il Han <corone.il.han@gmail.com>
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/err.h>
19#include <linux/hwmon.h>
20#include <linux/hwmon-sysfs.h>
21#include <linux/i2c.h>
22#include <linux/init.h>
23#include <linux/jiffies.h>
24#include <linux/module.h>
25#include <linux/slab.h>
26
27/* MAX31790 registers */
28#define MAX31790_REG_GLOBAL_CONFIG 0x00
29#define MAX31790_REG_FAN_CONFIG(ch) (0x02 + (ch))
30#define MAX31790_REG_FAN_DYNAMICS(ch) (0x08 + (ch))
31#define MAX31790_REG_FAN_FAULT_STATUS2 0x10
32#define MAX31790_REG_FAN_FAULT_STATUS1 0x11
33#define MAX31790_REG_TACH_COUNT(ch) (0x18 + (ch) * 2)
34#define MAX31790_REG_PWM_DUTY_CYCLE(ch) (0x30 + (ch) * 2)
35#define MAX31790_REG_PWMOUT(ch) (0x40 + (ch) * 2)
36#define MAX31790_REG_TARGET_COUNT(ch) (0x50 + (ch) * 2)
37
38/* Fan Config register bits */
39#define MAX31790_FAN_CFG_RPM_MODE 0x80
40#define MAX31790_FAN_CFG_TACH_INPUT_EN 0x08
41#define MAX31790_FAN_CFG_TACH_INPUT 0x01
42
43/* Fan Dynamics register bits */
44#define MAX31790_FAN_DYN_SR_SHIFT 5
45#define MAX31790_FAN_DYN_SR_MASK 0xE0
46#define SR_FROM_REG(reg) (((reg) & MAX31790_FAN_DYN_SR_MASK) \
47 >> MAX31790_FAN_DYN_SR_SHIFT)
48
49#define FAN_RPM_MIN 120
50#define FAN_RPM_MAX 7864320
51
52#define RPM_FROM_REG(reg, sr) (((reg) >> 4) ? \
53 ((60 * (sr) * 8192) / ((reg) >> 4)) : \
54 FAN_RPM_MAX)
55#define RPM_TO_REG(rpm, sr) ((60 * (sr) * 8192) / ((rpm) * 2))
56
57#define NR_CHANNEL 6
58
59/*
60 * Client data (each client gets its own)
61 */
62struct max31790_data {
63 struct i2c_client *client;
64 struct mutex update_lock;
65 bool valid; /* zero until following fields are valid */
66 unsigned long last_updated; /* in jiffies */
67
68 /* register values */
69 u8 fan_config[NR_CHANNEL];
70 u8 fan_dynamics[NR_CHANNEL];
71 u16 fault_status;
72 u16 tach[NR_CHANNEL * 2];
73 u16 pwm[NR_CHANNEL];
74 u16 target_count[NR_CHANNEL];
75};
76
77static struct max31790_data *max31790_update_device(struct device *dev)
78{
79 struct max31790_data *data = dev_get_drvdata(dev);
80 struct i2c_client *client = data->client;
81 struct max31790_data *ret = data;
82 int i;
83 int rv;
84
85 mutex_lock(&data->update_lock);
86
87 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
88 rv = i2c_smbus_read_byte_data(client,
89 MAX31790_REG_FAN_FAULT_STATUS1);
90 if (rv < 0)
91 goto abort;
92 data->fault_status = rv & 0x3F;
93
94 rv = i2c_smbus_read_byte_data(client,
95 MAX31790_REG_FAN_FAULT_STATUS2);
96 if (rv < 0)
97 goto abort;
98 data->fault_status |= (rv & 0x3F) << 6;
99
100 for (i = 0; i < NR_CHANNEL; i++) {
101 rv = i2c_smbus_read_word_swapped(client,
102 MAX31790_REG_TACH_COUNT(i));
103 if (rv < 0)
104 goto abort;
105 data->tach[i] = rv;
106
107 if (data->fan_config[i]
108 & MAX31790_FAN_CFG_TACH_INPUT) {
109 rv = i2c_smbus_read_word_swapped(client,
110 MAX31790_REG_TACH_COUNT(NR_CHANNEL
111 + i));
112 if (rv < 0)
113 goto abort;
114 data->tach[NR_CHANNEL + i] = rv;
115 } else {
116 rv = i2c_smbus_read_word_swapped(client,
117 MAX31790_REG_PWMOUT(i));
118 if (rv < 0)
119 goto abort;
120 data->pwm[i] = rv;
121
122 rv = i2c_smbus_read_word_swapped(client,
123 MAX31790_REG_TARGET_COUNT(i));
124 if (rv < 0)
125 goto abort;
126 data->target_count[i] = rv;
127 }
128 }
129
130 data->last_updated = jiffies;
131 data->valid = true;
132 }
133 goto done;
134
135abort:
136 data->valid = false;
137 ret = ERR_PTR(rv);
138
139done:
140 mutex_unlock(&data->update_lock);
141
142 return ret;
143}
144
145static const u8 tach_period[8] = { 1, 2, 4, 8, 16, 32, 32, 32 };
146
147static u8 get_tach_period(u8 fan_dynamics)
148{
149 return tach_period[SR_FROM_REG(fan_dynamics)];
150}
151
152static u8 bits_for_tach_period(int rpm)
153{
154 u8 bits;
155
156 if (rpm < 500)
157 bits = 0x0;
158 else if (rpm < 1000)
159 bits = 0x1;
160 else if (rpm < 2000)
161 bits = 0x2;
162 else if (rpm < 4000)
163 bits = 0x3;
164 else if (rpm < 8000)
165 bits = 0x4;
166 else
167 bits = 0x5;
168
169 return bits;
170}
171
172static ssize_t get_fan(struct device *dev,
173 struct device_attribute *devattr, char *buf)
174{
175 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
176 struct max31790_data *data = max31790_update_device(dev);
177 int sr, rpm;
178
179 if (IS_ERR(data))
180 return PTR_ERR(data);
181
182 sr = get_tach_period(data->fan_dynamics[attr->index]);
183 rpm = RPM_FROM_REG(data->tach[attr->index], sr);
184
185 return sprintf(buf, "%d\n", rpm);
186}
187
188static ssize_t get_fan_target(struct device *dev,
189 struct device_attribute *devattr, char *buf)
190{
191 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
192 struct max31790_data *data = max31790_update_device(dev);
193 int sr, rpm;
194
195 if (IS_ERR(data))
196 return PTR_ERR(data);
197
198 sr = get_tach_period(data->fan_dynamics[attr->index]);
199 rpm = RPM_FROM_REG(data->target_count[attr->index], sr);
200
201 return sprintf(buf, "%d\n", rpm);
202}
203
204static ssize_t set_fan_target(struct device *dev,
205 struct device_attribute *devattr,
206 const char *buf, size_t count)
207{
208 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
209 struct max31790_data *data = dev_get_drvdata(dev);
210 struct i2c_client *client = data->client;
211 u8 bits;
212 int sr;
213 int target_count;
214 unsigned long rpm;
215 int err;
216
217 err = kstrtoul(buf, 10, &rpm);
218 if (err)
219 return err;
220
221 mutex_lock(&data->update_lock);
222
223 rpm = clamp_val(rpm, FAN_RPM_MIN, FAN_RPM_MAX);
224 bits = bits_for_tach_period(rpm);
225 data->fan_dynamics[attr->index] =
226 ((data->fan_dynamics[attr->index]
227 & ~MAX31790_FAN_DYN_SR_MASK)
228 | (bits << MAX31790_FAN_DYN_SR_SHIFT));
229 err = i2c_smbus_write_byte_data(client,
230 MAX31790_REG_FAN_DYNAMICS(attr->index),
231 data->fan_dynamics[attr->index]);
232
233 if (err < 0) {
234 mutex_unlock(&data->update_lock);
235 return err;
236 }
237
238 sr = get_tach_period(data->fan_dynamics[attr->index]);
239 target_count = RPM_TO_REG(rpm, sr);
240 target_count = clamp_val(target_count, 0x1, 0x7FF);
241
242 data->target_count[attr->index] = target_count << 5;
243
244 err = i2c_smbus_write_word_swapped(client,
245 MAX31790_REG_TARGET_COUNT(attr->index),
246 data->target_count[attr->index]);
247
248 mutex_unlock(&data->update_lock);
249
250 if (err < 0)
251 return err;
252
253 return count;
254}
255
256static ssize_t get_pwm(struct device *dev,
257 struct device_attribute *devattr, char *buf)
258{
259 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
260 struct max31790_data *data = max31790_update_device(dev);
261 int pwm;
262
263 if (IS_ERR(data))
264 return PTR_ERR(data);
265
266 pwm = data->pwm[attr->index] >> 8;
267
268 return sprintf(buf, "%d\n", pwm);
269}
270
271static ssize_t set_pwm(struct device *dev,
272 struct device_attribute *devattr,
273 const char *buf, size_t count)
274{
275 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
276 struct max31790_data *data = dev_get_drvdata(dev);
277 struct i2c_client *client = data->client;
278 unsigned long pwm;
279 int err;
280
281 err = kstrtoul(buf, 10, &pwm);
282 if (err)
283 return err;
284
285 if (pwm > 255)
286 return -EINVAL;
287
288 mutex_lock(&data->update_lock);
289
290 data->pwm[attr->index] = pwm << 8;
291 err = i2c_smbus_write_word_swapped(client,
292 MAX31790_REG_PWMOUT(attr->index),
293 data->pwm[attr->index]);
294
295 mutex_unlock(&data->update_lock);
296
297 if (err < 0)
298 return err;
299
300 return count;
301}
302
303static ssize_t get_pwm_enable(struct device *dev,
304 struct device_attribute *devattr, char *buf)
305{
306 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
307 struct max31790_data *data = max31790_update_device(dev);
308 int mode;
309
310 if (IS_ERR(data))
311 return PTR_ERR(data);
312
313 if (data->fan_config[attr->index] & MAX31790_FAN_CFG_RPM_MODE)
314 mode = 2;
315 else if (data->fan_config[attr->index] & MAX31790_FAN_CFG_TACH_INPUT_EN)
316 mode = 1;
317 else
318 mode = 0;
319
320 return sprintf(buf, "%d\n", mode);
321}
322
323static ssize_t set_pwm_enable(struct device *dev,
324 struct device_attribute *devattr,
325 const char *buf, size_t count)
326{
327 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
328 struct max31790_data *data = dev_get_drvdata(dev);
329 struct i2c_client *client = data->client;
330 unsigned long mode;
331 int err;
332
333 err = kstrtoul(buf, 10, &mode);
334 if (err)
335 return err;
336
337 switch (mode) {
338 case 0:
339 data->fan_config[attr->index] =
340 data->fan_config[attr->index]
341 & ~(MAX31790_FAN_CFG_TACH_INPUT_EN
342 | MAX31790_FAN_CFG_RPM_MODE);
343 break;
344 case 1:
345 data->fan_config[attr->index] =
346 (data->fan_config[attr->index]
347 | MAX31790_FAN_CFG_TACH_INPUT_EN)
348 & ~MAX31790_FAN_CFG_RPM_MODE;
349 break;
350 case 2:
351 data->fan_config[attr->index] =
352 data->fan_config[attr->index]
353 | MAX31790_FAN_CFG_TACH_INPUT_EN
354 | MAX31790_FAN_CFG_RPM_MODE;
355 break;
356 default:
357 return -EINVAL;
358 }
359
360 mutex_lock(&data->update_lock);
361
362 err = i2c_smbus_write_byte_data(client,
363 MAX31790_REG_FAN_CONFIG(attr->index),
364 data->fan_config[attr->index]);
365
366 mutex_unlock(&data->update_lock);
367
368 if (err < 0)
369 return err;
370
371 return count;
372}
373
374static ssize_t get_fan_fault(struct device *dev,
375 struct device_attribute *devattr, char *buf)
376{
377 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
378 struct max31790_data *data = max31790_update_device(dev);
379 int fault;
380
381 if (IS_ERR(data))
382 return PTR_ERR(data);
383
384 fault = !!(data->fault_status & (1 << attr->index));
385
386 return sprintf(buf, "%d\n", fault);
387}
388
389static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, 0);
390static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, get_fan, NULL, 1);
391static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, get_fan, NULL, 2);
392static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, get_fan, NULL, 3);
393static SENSOR_DEVICE_ATTR(fan5_input, S_IRUGO, get_fan, NULL, 4);
394static SENSOR_DEVICE_ATTR(fan6_input, S_IRUGO, get_fan, NULL, 5);
395
396static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan_fault, NULL, 0);
397static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, get_fan_fault, NULL, 1);
398static SENSOR_DEVICE_ATTR(fan3_fault, S_IRUGO, get_fan_fault, NULL, 2);
399static SENSOR_DEVICE_ATTR(fan4_fault, S_IRUGO, get_fan_fault, NULL, 3);
400static SENSOR_DEVICE_ATTR(fan5_fault, S_IRUGO, get_fan_fault, NULL, 4);
401static SENSOR_DEVICE_ATTR(fan6_fault, S_IRUGO, get_fan_fault, NULL, 5);
402
403static SENSOR_DEVICE_ATTR(fan7_input, S_IRUGO, get_fan, NULL, 6);
404static SENSOR_DEVICE_ATTR(fan8_input, S_IRUGO, get_fan, NULL, 7);
405static SENSOR_DEVICE_ATTR(fan9_input, S_IRUGO, get_fan, NULL, 8);
406static SENSOR_DEVICE_ATTR(fan10_input, S_IRUGO, get_fan, NULL, 9);
407static SENSOR_DEVICE_ATTR(fan11_input, S_IRUGO, get_fan, NULL, 10);
408static SENSOR_DEVICE_ATTR(fan12_input, S_IRUGO, get_fan, NULL, 11);
409
410static SENSOR_DEVICE_ATTR(fan7_fault, S_IRUGO, get_fan_fault, NULL, 6);
411static SENSOR_DEVICE_ATTR(fan8_fault, S_IRUGO, get_fan_fault, NULL, 7);
412static SENSOR_DEVICE_ATTR(fan9_fault, S_IRUGO, get_fan_fault, NULL, 8);
413static SENSOR_DEVICE_ATTR(fan10_fault, S_IRUGO, get_fan_fault, NULL, 9);
414static SENSOR_DEVICE_ATTR(fan11_fault, S_IRUGO, get_fan_fault, NULL, 10);
415static SENSOR_DEVICE_ATTR(fan12_fault, S_IRUGO, get_fan_fault, NULL, 11);
416
417static SENSOR_DEVICE_ATTR(fan1_target, S_IWUSR | S_IRUGO,
418 get_fan_target, set_fan_target, 0);
419static SENSOR_DEVICE_ATTR(fan2_target, S_IWUSR | S_IRUGO,
420 get_fan_target, set_fan_target, 1);
421static SENSOR_DEVICE_ATTR(fan3_target, S_IWUSR | S_IRUGO,
422 get_fan_target, set_fan_target, 2);
423static SENSOR_DEVICE_ATTR(fan4_target, S_IWUSR | S_IRUGO,
424 get_fan_target, set_fan_target, 3);
425static SENSOR_DEVICE_ATTR(fan5_target, S_IWUSR | S_IRUGO,
426 get_fan_target, set_fan_target, 4);
427static SENSOR_DEVICE_ATTR(fan6_target, S_IWUSR | S_IRUGO,
428 get_fan_target, set_fan_target, 5);
429
430static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 0);
431static SENSOR_DEVICE_ATTR(pwm2, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 1);
432static SENSOR_DEVICE_ATTR(pwm3, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 2);
433static SENSOR_DEVICE_ATTR(pwm4, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 3);
434static SENSOR_DEVICE_ATTR(pwm5, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 4);
435static SENSOR_DEVICE_ATTR(pwm6, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 5);
436
437static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
438 get_pwm_enable, set_pwm_enable, 0);
439static SENSOR_DEVICE_ATTR(pwm2_enable, S_IWUSR | S_IRUGO,
440 get_pwm_enable, set_pwm_enable, 1);
441static SENSOR_DEVICE_ATTR(pwm3_enable, S_IWUSR | S_IRUGO,
442 get_pwm_enable, set_pwm_enable, 2);
443static SENSOR_DEVICE_ATTR(pwm4_enable, S_IWUSR | S_IRUGO,
444 get_pwm_enable, set_pwm_enable, 3);
445static SENSOR_DEVICE_ATTR(pwm5_enable, S_IWUSR | S_IRUGO,
446 get_pwm_enable, set_pwm_enable, 4);
447static SENSOR_DEVICE_ATTR(pwm6_enable, S_IWUSR | S_IRUGO,
448 get_pwm_enable, set_pwm_enable, 5);
449
450static struct attribute *max31790_attrs[] = {
451 &sensor_dev_attr_fan1_input.dev_attr.attr,
452 &sensor_dev_attr_fan2_input.dev_attr.attr,
453 &sensor_dev_attr_fan3_input.dev_attr.attr,
454 &sensor_dev_attr_fan4_input.dev_attr.attr,
455 &sensor_dev_attr_fan5_input.dev_attr.attr,
456 &sensor_dev_attr_fan6_input.dev_attr.attr,
457
458 &sensor_dev_attr_fan1_fault.dev_attr.attr,
459 &sensor_dev_attr_fan2_fault.dev_attr.attr,
460 &sensor_dev_attr_fan3_fault.dev_attr.attr,
461 &sensor_dev_attr_fan4_fault.dev_attr.attr,
462 &sensor_dev_attr_fan5_fault.dev_attr.attr,
463 &sensor_dev_attr_fan6_fault.dev_attr.attr,
464
465 &sensor_dev_attr_fan7_input.dev_attr.attr,
466 &sensor_dev_attr_fan8_input.dev_attr.attr,
467 &sensor_dev_attr_fan9_input.dev_attr.attr,
468 &sensor_dev_attr_fan10_input.dev_attr.attr,
469 &sensor_dev_attr_fan11_input.dev_attr.attr,
470 &sensor_dev_attr_fan12_input.dev_attr.attr,
471
472 &sensor_dev_attr_fan7_fault.dev_attr.attr,
473 &sensor_dev_attr_fan8_fault.dev_attr.attr,
474 &sensor_dev_attr_fan9_fault.dev_attr.attr,
475 &sensor_dev_attr_fan10_fault.dev_attr.attr,
476 &sensor_dev_attr_fan11_fault.dev_attr.attr,
477 &sensor_dev_attr_fan12_fault.dev_attr.attr,
478
479 &sensor_dev_attr_fan1_target.dev_attr.attr,
480 &sensor_dev_attr_fan2_target.dev_attr.attr,
481 &sensor_dev_attr_fan3_target.dev_attr.attr,
482 &sensor_dev_attr_fan4_target.dev_attr.attr,
483 &sensor_dev_attr_fan5_target.dev_attr.attr,
484 &sensor_dev_attr_fan6_target.dev_attr.attr,
485
486 &sensor_dev_attr_pwm1.dev_attr.attr,
487 &sensor_dev_attr_pwm2.dev_attr.attr,
488 &sensor_dev_attr_pwm3.dev_attr.attr,
489 &sensor_dev_attr_pwm4.dev_attr.attr,
490 &sensor_dev_attr_pwm5.dev_attr.attr,
491 &sensor_dev_attr_pwm6.dev_attr.attr,
492
493 &sensor_dev_attr_pwm1_enable.dev_attr.attr,
494 &sensor_dev_attr_pwm2_enable.dev_attr.attr,
495 &sensor_dev_attr_pwm3_enable.dev_attr.attr,
496 &sensor_dev_attr_pwm4_enable.dev_attr.attr,
497 &sensor_dev_attr_pwm5_enable.dev_attr.attr,
498 &sensor_dev_attr_pwm6_enable.dev_attr.attr,
499 NULL
500};
501
502static umode_t max31790_attrs_visible(struct kobject *kobj,
503 struct attribute *a, int n)
504{
505 struct device *dev = container_of(kobj, struct device, kobj);
506 struct max31790_data *data = dev_get_drvdata(dev);
507 struct device_attribute *devattr =
508 container_of(a, struct device_attribute, attr);
509 int index = to_sensor_dev_attr(devattr)->index % NR_CHANNEL;
510 u8 fan_config;
511
512 fan_config = data->fan_config[index];
513
514 if (n >= NR_CHANNEL * 2 && n < NR_CHANNEL * 4 &&
515 !(fan_config & MAX31790_FAN_CFG_TACH_INPUT))
516 return 0;
517 if (n >= NR_CHANNEL * 4 && (fan_config & MAX31790_FAN_CFG_TACH_INPUT))
518 return 0;
519
520 return a->mode;
521}
522
523static const struct attribute_group max31790_group = {
524 .attrs = max31790_attrs,
525 .is_visible = max31790_attrs_visible,
526};
527__ATTRIBUTE_GROUPS(max31790);
528
529static int max31790_init_client(struct i2c_client *client,
530 struct max31790_data *data)
531{
532 int i, rv;
533
534 for (i = 0; i < NR_CHANNEL; i++) {
535 rv = i2c_smbus_read_byte_data(client,
536 MAX31790_REG_FAN_CONFIG(i));
537 if (rv < 0)
538 return rv;
539 data->fan_config[i] = rv;
540
541 rv = i2c_smbus_read_byte_data(client,
542 MAX31790_REG_FAN_DYNAMICS(i));
543 if (rv < 0)
544 return rv;
545 data->fan_dynamics[i] = rv;
546 }
547
548 return 0;
549}
550
551static int max31790_probe(struct i2c_client *client,
552 const struct i2c_device_id *id)
553{
554 struct i2c_adapter *adapter = client->adapter;
555 struct device *dev = &client->dev;
556 struct max31790_data *data;
557 struct device *hwmon_dev;
558 int err;
559
560 if (!i2c_check_functionality(adapter,
561 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
562 return -ENODEV;
563
564 data = devm_kzalloc(dev, sizeof(struct max31790_data), GFP_KERNEL);
565 if (!data)
566 return -ENOMEM;
567
568 data->client = client;
569 mutex_init(&data->update_lock);
570
571 /*
572 * Initialize the max31790 chip
573 */
574 err = max31790_init_client(client, data);
575 if (err)
576 return err;
577
578 hwmon_dev = devm_hwmon_device_register_with_groups(dev,
579 client->name, data, max31790_groups);
580
581 return PTR_ERR_OR_ZERO(hwmon_dev);
582}
583
584static const struct i2c_device_id max31790_id[] = {
585 { "max31790", 0 },
586 { }
587};
588MODULE_DEVICE_TABLE(i2c, max31790_id);
589
590static struct i2c_driver max31790_driver = {
591 .class = I2C_CLASS_HWMON,
592 .probe = max31790_probe,
593 .driver = {
594 .name = "max31790",
595 },
596 .id_table = max31790_id,
597};
598
599module_i2c_driver(max31790_driver);
600
601MODULE_AUTHOR("Il Han <corone.il.han@gmail.com>");
602MODULE_DESCRIPTION("MAX31790 sensor driver");
603MODULE_LICENSE("GPL");