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authorIl Han <corone.il.han@gmail.com>2015-08-30 07:44:26 -0400
committerGuenter Roeck <linux@roeck-us.net>2015-10-14 10:57:14 -0400
commit195a4b4298a7951c845dac2b326585c66add3435 (patch)
treeea2e8e46af138e75ccc0f36f0d5f4d40958496d7
parent25cb62b76430a91cc6195f902e61c2cb84ade622 (diff)
hwmon: Driver for Maxim MAX31790
The driver supports the Maxim MAX31790. Signed-off-by: Il Han <corone.il.han@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat
-rw-r--r--Documentation/hwmon/max3179037
-rw-r--r--drivers/hwmon/Kconfig10
-rw-r--r--drivers/hwmon/Makefile1
-rw-r--r--drivers/hwmon/max31790.c603
4 files changed, 651 insertions, 0 deletions
diff --git a/Documentation/hwmon/max31790 b/Documentation/hwmon/max31790
new file mode 100644
index 000000000000..855e62430da9
--- /dev/null
+++ b/Documentation/hwmon/max31790
@@ -0,0 +1,37 @@
1Kernel driver max31790
2======================
3
4Supported chips:
5 * Maxim MAX31790
6 Prefix: 'max31790'
7 Addresses scanned: -
8 Datasheet: http://pdfserv.maximintegrated.com/en/ds/MAX31790.pdf
9
10Author: Il Han <corone.il.han@gmail.com>
11
12
13Description
14-----------
15
16This driver implements support for the Maxim MAX31790 chip.
17
18The MAX31790 controls the speeds of up to six fans using six independent
19PWM outputs. The desired fan speeds (or PWM duty cycles) are written
20through the I2C interface. The outputs drive "4-wire" fans directly,
21or can be used to modulate the fan's power terminals using an external
22pass transistor.
23
24Tachometer inputs monitor fan tachometer logic outputs for precise (+/-1%)
25monitoring and control of fan RPM as well as detection of fan failure.
26Six pins are dedicated tachometer inputs. Any of the six PWM outputs can
27also be configured to serve as tachometer inputs.
28
29
30Sysfs entries
31-------------
32
33fan[1-12]_input RO fan tachometer speed in RPM
34fan[1-12]_fault RO fan experienced fault
35fan[1-6]_target RW desired fan speed in RPM
36pwm[1-6]_enable RW regulator mode, 0=disabled, 1=manual mode, 2=rpm mode
37pwm[1-6] RW fan target duty cycle (0-255)
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index e13c902e8966..796569eeaf1d 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -840,6 +840,16 @@ config SENSORS_MAX6697
840 This driver can also be built as a module. If so, the module 840 This driver can also be built as a module. If so, the module
841 will be called max6697. 841 will be called max6697.
842 842
843config SENSORS_MAX31790
844 tristate "Maxim MAX31790 sensor chip"
845 depends on I2C
846 help
847 If you say yes here you get support for 6-Channel PWM-Output
848 Fan RPM Controller.
849
850 This driver can also be built as a module. If so, the module
851 will be called max31790.
852
843config SENSORS_HTU21 853config SENSORS_HTU21
844 tristate "Measurement Specialties HTU21D humidity/temperature sensors" 854 tristate "Measurement Specialties HTU21D humidity/temperature sensors"
845 depends on I2C 855 depends on I2C
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 9e0f3dd2841d..01855ee641d1 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -115,6 +115,7 @@ obj-$(CONFIG_SENSORS_MAX6639) += max6639.o
115obj-$(CONFIG_SENSORS_MAX6642) += max6642.o 115obj-$(CONFIG_SENSORS_MAX6642) += max6642.o
116obj-$(CONFIG_SENSORS_MAX6650) += max6650.o 116obj-$(CONFIG_SENSORS_MAX6650) += max6650.o
117obj-$(CONFIG_SENSORS_MAX6697) += max6697.o 117obj-$(CONFIG_SENSORS_MAX6697) += max6697.o
118obj-$(CONFIG_SENSORS_MAX31790) += max31790.o
118obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o 119obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o
119obj-$(CONFIG_SENSORS_MCP3021) += mcp3021.o 120obj-$(CONFIG_SENSORS_MCP3021) += mcp3021.o
120obj-$(CONFIG_SENSORS_MENF21BMC_HWMON) += menf21bmc_hwmon.o 121obj-$(CONFIG_SENSORS_MENF21BMC_HWMON) += menf21bmc_hwmon.o
diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c
new file mode 100644
index 000000000000..f1296680833a
--- /dev/null
+++ b/drivers/hwmon/max31790.c
@@ -0,0 +1,603 @@
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 = get_tach_period(data->fan_dynamics[attr->index]);
178 int rpm;
179
180 if (IS_ERR(data))
181 return PTR_ERR(data);
182
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 = get_tach_period(data->fan_dynamics[attr->index]);
194 int rpm;
195
196 if (IS_ERR(data))
197 return PTR_ERR(data);
198
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");
generated by cgit v1.2.2 (git 2.25.0) at 2025-03-28 14:23:01 -0400