1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * max6650.c - Part of lm_sensors, Linux kernel modules for hardware |
4 | * monitoring. |
5 | * |
6 | * (C) 2007 by Hans J. Koch <hjk@hansjkoch.de> |
7 | * |
8 | * based on code written by John Morris <john.morris@spirentcom.com> |
9 | * Copyright (c) 2003 Spirent Communications |
10 | * and Claus Gindhart <claus.gindhart@kontron.com> |
11 | * |
12 | * This module has only been tested with the MAX6650 chip. It should |
13 | * also work with the MAX6651. It does not distinguish max6650 and max6651 |
14 | * chips. |
15 | * |
16 | * The datasheet was last seen at: |
17 | * |
18 | * http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf |
19 | */ |
20 | |
21 | #include <linux/module.h> |
22 | #include <linux/init.h> |
23 | #include <linux/slab.h> |
24 | #include <linux/jiffies.h> |
25 | #include <linux/i2c.h> |
26 | #include <linux/hwmon.h> |
27 | #include <linux/hwmon-sysfs.h> |
28 | #include <linux/err.h> |
29 | #include <linux/of.h> |
30 | #include <linux/thermal.h> |
31 | |
32 | /* |
33 | * Insmod parameters |
34 | */ |
35 | |
36 | /* fan_voltage: 5=5V fan, 12=12V fan, 0=don't change */ |
37 | static int fan_voltage; |
38 | /* prescaler: Possible values are 1, 2, 4, 8, 16 or 0 for don't change */ |
39 | static int prescaler; |
40 | /* clock: The clock frequency of the chip (max6651 can be clocked externally) */ |
41 | static int clock = 254000; |
42 | |
43 | module_param(fan_voltage, int, 0444); |
44 | module_param(prescaler, int, 0444); |
45 | module_param(clock, int, 0444); |
46 | |
47 | /* |
48 | * MAX 6650/6651 registers |
49 | */ |
50 | |
51 | #define MAX6650_REG_SPEED 0x00 |
52 | #define MAX6650_REG_CONFIG 0x02 |
53 | #define MAX6650_REG_GPIO_DEF 0x04 |
54 | #define MAX6650_REG_DAC 0x06 |
55 | #define MAX6650_REG_ALARM_EN 0x08 |
56 | #define MAX6650_REG_ALARM 0x0A |
57 | #define MAX6650_REG_TACH0 0x0C |
58 | #define MAX6650_REG_TACH1 0x0E |
59 | #define MAX6650_REG_TACH2 0x10 |
60 | #define MAX6650_REG_TACH3 0x12 |
61 | #define MAX6650_REG_GPIO_STAT 0x14 |
62 | #define MAX6650_REG_COUNT 0x16 |
63 | |
64 | /* |
65 | * Config register bits |
66 | */ |
67 | |
68 | #define MAX6650_CFG_V12 0x08 |
69 | #define MAX6650_CFG_PRESCALER_MASK 0x07 |
70 | #define MAX6650_CFG_PRESCALER_2 0x01 |
71 | #define MAX6650_CFG_PRESCALER_4 0x02 |
72 | #define MAX6650_CFG_PRESCALER_8 0x03 |
73 | #define MAX6650_CFG_PRESCALER_16 0x04 |
74 | #define MAX6650_CFG_MODE_MASK 0x30 |
75 | #define MAX6650_CFG_MODE_ON 0x00 |
76 | #define MAX6650_CFG_MODE_OFF 0x10 |
77 | #define MAX6650_CFG_MODE_CLOSED_LOOP 0x20 |
78 | #define MAX6650_CFG_MODE_OPEN_LOOP 0x30 |
79 | #define MAX6650_COUNT_MASK 0x03 |
80 | |
81 | /* |
82 | * Alarm status register bits |
83 | */ |
84 | |
85 | #define MAX6650_ALRM_MAX 0x01 |
86 | #define MAX6650_ALRM_MIN 0x02 |
87 | #define MAX6650_ALRM_TACH 0x04 |
88 | #define MAX6650_ALRM_GPIO1 0x08 |
89 | #define MAX6650_ALRM_GPIO2 0x10 |
90 | |
91 | /* Minimum and maximum values of the FAN-RPM */ |
92 | #define FAN_RPM_MIN 240 |
93 | #define FAN_RPM_MAX 30000 |
94 | |
95 | #define DIV_FROM_REG(reg) (1 << ((reg) & 7)) |
96 | #define DAC_LIMIT(v12) ((v12) ? 180 : 76) |
97 | |
98 | /* |
99 | * Client data (each client gets its own) |
100 | */ |
101 | |
102 | struct max6650_data { |
103 | struct i2c_client *client; |
104 | struct mutex update_lock; /* protect alarm register updates */ |
105 | int nr_fans; |
106 | bool valid; /* false until following fields are valid */ |
107 | unsigned long last_updated; /* in jiffies */ |
108 | |
109 | /* register values */ |
110 | u8 speed; |
111 | u8 config; |
112 | u8 tach[4]; |
113 | u8 count; |
114 | u8 dac; |
115 | u8 alarm; |
116 | u8 alarm_en; |
117 | unsigned long cooling_dev_state; |
118 | }; |
119 | |
120 | static const u8 tach_reg[] = { |
121 | MAX6650_REG_TACH0, |
122 | MAX6650_REG_TACH1, |
123 | MAX6650_REG_TACH2, |
124 | MAX6650_REG_TACH3, |
125 | }; |
126 | |
127 | static const struct of_device_id __maybe_unused max6650_dt_match[] = { |
128 | { |
129 | .compatible = "maxim,max6650" , |
130 | .data = (void *)1 |
131 | }, |
132 | { |
133 | .compatible = "maxim,max6651" , |
134 | .data = (void *)4 |
135 | }, |
136 | { }, |
137 | }; |
138 | MODULE_DEVICE_TABLE(of, max6650_dt_match); |
139 | |
140 | static int dac_to_pwm(int dac, bool v12) |
141 | { |
142 | /* |
143 | * Useful range for dac is 0-180 for 12V fans and 0-76 for 5V fans. |
144 | * Lower DAC values mean higher speeds. |
145 | */ |
146 | return clamp_val(255 - (255 * dac) / DAC_LIMIT(v12), 0, 255); |
147 | } |
148 | |
149 | static u8 pwm_to_dac(unsigned int pwm, bool v12) |
150 | { |
151 | int limit = DAC_LIMIT(v12); |
152 | |
153 | return limit - (limit * pwm) / 255; |
154 | } |
155 | |
156 | static struct max6650_data *max6650_update_device(struct device *dev) |
157 | { |
158 | struct max6650_data *data = dev_get_drvdata(dev); |
159 | struct i2c_client *client = data->client; |
160 | int reg, err = 0; |
161 | int i; |
162 | |
163 | mutex_lock(&data->update_lock); |
164 | |
165 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { |
166 | for (i = 0; i < data->nr_fans; i++) { |
167 | reg = i2c_smbus_read_byte_data(client, command: tach_reg[i]); |
168 | if (reg < 0) { |
169 | err = reg; |
170 | goto error; |
171 | } |
172 | data->tach[i] = reg; |
173 | } |
174 | |
175 | /* |
176 | * Alarms are cleared on read in case the condition that |
177 | * caused the alarm is removed. Keep the value latched here |
178 | * for providing the register through different alarm files. |
179 | */ |
180 | reg = i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM); |
181 | if (reg < 0) { |
182 | err = reg; |
183 | goto error; |
184 | } |
185 | data->alarm |= reg; |
186 | data->last_updated = jiffies; |
187 | data->valid = true; |
188 | } |
189 | |
190 | error: |
191 | mutex_unlock(lock: &data->update_lock); |
192 | if (err) |
193 | data = ERR_PTR(error: err); |
194 | return data; |
195 | } |
196 | |
197 | /* |
198 | * Change the operating mode of the chip (if needed). |
199 | * mode is one of the MAX6650_CFG_MODE_* values. |
200 | */ |
201 | static int max6650_set_operating_mode(struct max6650_data *data, u8 mode) |
202 | { |
203 | int result; |
204 | u8 config = data->config; |
205 | |
206 | if (mode == (config & MAX6650_CFG_MODE_MASK)) |
207 | return 0; |
208 | |
209 | config = (config & ~MAX6650_CFG_MODE_MASK) | mode; |
210 | |
211 | result = i2c_smbus_write_byte_data(client: data->client, MAX6650_REG_CONFIG, |
212 | value: config); |
213 | if (result < 0) |
214 | return result; |
215 | |
216 | data->config = config; |
217 | |
218 | return 0; |
219 | } |
220 | |
221 | /* |
222 | * Set the fan speed to the specified RPM (or read back the RPM setting). |
223 | * This works in closed loop mode only. Use pwm1 for open loop speed setting. |
224 | * |
225 | * The MAX6650/1 will automatically control fan speed when in closed loop |
226 | * mode. |
227 | * |
228 | * Assumptions: |
229 | * |
230 | * 1) The MAX6650/1 internal 254kHz clock frequency is set correctly. Use |
231 | * the clock module parameter if you need to fine tune this. |
232 | * |
233 | * 2) The prescaler (low three bits of the config register) has already |
234 | * been set to an appropriate value. Use the prescaler module parameter |
235 | * if your BIOS doesn't initialize the chip properly. |
236 | * |
237 | * The relevant equations are given on pages 21 and 22 of the datasheet. |
238 | * |
239 | * From the datasheet, the relevant equation when in regulation is: |
240 | * |
241 | * [fCLK / (128 x (KTACH + 1))] = 2 x FanSpeed / KSCALE |
242 | * |
243 | * where: |
244 | * |
245 | * fCLK is the oscillator frequency (either the 254kHz internal |
246 | * oscillator or the externally applied clock) |
247 | * |
248 | * KTACH is the value in the speed register |
249 | * |
250 | * FanSpeed is the speed of the fan in rps |
251 | * |
252 | * KSCALE is the prescaler value (1, 2, 4, 8, or 16) |
253 | * |
254 | * When reading, we need to solve for FanSpeed. When writing, we need to |
255 | * solve for KTACH. |
256 | * |
257 | * Note: this tachometer is completely separate from the tachometers |
258 | * used to measure the fan speeds. Only one fan's speed (fan1) is |
259 | * controlled. |
260 | */ |
261 | |
262 | static int max6650_set_target(struct max6650_data *data, unsigned long rpm) |
263 | { |
264 | int kscale, ktach; |
265 | |
266 | if (rpm == 0) |
267 | return max6650_set_operating_mode(data, MAX6650_CFG_MODE_OFF); |
268 | |
269 | rpm = clamp_val(rpm, FAN_RPM_MIN, FAN_RPM_MAX); |
270 | |
271 | /* |
272 | * Divide the required speed by 60 to get from rpm to rps, then |
273 | * use the datasheet equation: |
274 | * |
275 | * KTACH = [(fCLK x KSCALE) / (256 x FanSpeed)] - 1 |
276 | */ |
277 | |
278 | kscale = DIV_FROM_REG(data->config); |
279 | ktach = ((clock * kscale) / (256 * rpm / 60)) - 1; |
280 | if (ktach < 0) |
281 | ktach = 0; |
282 | if (ktach > 255) |
283 | ktach = 255; |
284 | data->speed = ktach; |
285 | |
286 | return i2c_smbus_write_byte_data(client: data->client, MAX6650_REG_SPEED, |
287 | value: data->speed); |
288 | } |
289 | |
290 | /* |
291 | * Get gpio alarm status: |
292 | * Possible values: |
293 | * 0 = no alarm |
294 | * 1 = alarm |
295 | */ |
296 | |
297 | static ssize_t alarm_show(struct device *dev, |
298 | struct device_attribute *devattr, char *buf) |
299 | { |
300 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
301 | struct max6650_data *data = max6650_update_device(dev); |
302 | bool alarm; |
303 | |
304 | if (IS_ERR(ptr: data)) |
305 | return PTR_ERR(ptr: data); |
306 | |
307 | alarm = data->alarm & attr->index; |
308 | if (alarm) { |
309 | mutex_lock(&data->update_lock); |
310 | data->alarm &= ~attr->index; |
311 | data->valid = false; |
312 | mutex_unlock(lock: &data->update_lock); |
313 | } |
314 | |
315 | return sprintf(buf, fmt: "%d\n" , alarm); |
316 | } |
317 | |
318 | static SENSOR_DEVICE_ATTR_RO(gpio1_alarm, alarm, MAX6650_ALRM_GPIO1); |
319 | static SENSOR_DEVICE_ATTR_RO(gpio2_alarm, alarm, MAX6650_ALRM_GPIO2); |
320 | |
321 | static umode_t max6650_attrs_visible(struct kobject *kobj, struct attribute *a, |
322 | int n) |
323 | { |
324 | struct device *dev = kobj_to_dev(kobj); |
325 | struct max6650_data *data = dev_get_drvdata(dev); |
326 | struct device_attribute *devattr; |
327 | |
328 | /* |
329 | * Hide the alarms that have not been enabled by the firmware |
330 | */ |
331 | |
332 | devattr = container_of(a, struct device_attribute, attr); |
333 | if (devattr == &sensor_dev_attr_gpio1_alarm.dev_attr || |
334 | devattr == &sensor_dev_attr_gpio2_alarm.dev_attr) { |
335 | if (!(data->alarm_en & to_sensor_dev_attr(devattr)->index)) |
336 | return 0; |
337 | } |
338 | |
339 | return a->mode; |
340 | } |
341 | |
342 | static struct attribute *max6650_attrs[] = { |
343 | &sensor_dev_attr_gpio1_alarm.dev_attr.attr, |
344 | &sensor_dev_attr_gpio2_alarm.dev_attr.attr, |
345 | NULL |
346 | }; |
347 | |
348 | static const struct attribute_group max6650_group = { |
349 | .attrs = max6650_attrs, |
350 | .is_visible = max6650_attrs_visible, |
351 | }; |
352 | |
353 | static const struct attribute_group *max6650_groups[] = { |
354 | &max6650_group, |
355 | NULL |
356 | }; |
357 | |
358 | static int max6650_init_client(struct max6650_data *data, |
359 | struct i2c_client *client) |
360 | { |
361 | struct device *dev = &client->dev; |
362 | int reg; |
363 | int err; |
364 | u32 voltage; |
365 | u32 prescale; |
366 | u32 target_rpm; |
367 | |
368 | if (of_property_read_u32(np: dev->of_node, propname: "maxim,fan-microvolt" , |
369 | out_value: &voltage)) |
370 | voltage = fan_voltage; |
371 | else |
372 | voltage /= 1000000; /* Microvolts to volts */ |
373 | if (of_property_read_u32(np: dev->of_node, propname: "maxim,fan-prescale" , |
374 | out_value: &prescale)) |
375 | prescale = prescaler; |
376 | |
377 | reg = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG); |
378 | if (reg < 0) { |
379 | dev_err(dev, "Error reading config register, aborting.\n" ); |
380 | return reg; |
381 | } |
382 | |
383 | switch (voltage) { |
384 | case 0: |
385 | break; |
386 | case 5: |
387 | reg &= ~MAX6650_CFG_V12; |
388 | break; |
389 | case 12: |
390 | reg |= MAX6650_CFG_V12; |
391 | break; |
392 | default: |
393 | dev_err(dev, "illegal value for fan_voltage (%d)\n" , voltage); |
394 | } |
395 | |
396 | switch (prescale) { |
397 | case 0: |
398 | break; |
399 | case 1: |
400 | reg &= ~MAX6650_CFG_PRESCALER_MASK; |
401 | break; |
402 | case 2: |
403 | reg = (reg & ~MAX6650_CFG_PRESCALER_MASK) |
404 | | MAX6650_CFG_PRESCALER_2; |
405 | break; |
406 | case 4: |
407 | reg = (reg & ~MAX6650_CFG_PRESCALER_MASK) |
408 | | MAX6650_CFG_PRESCALER_4; |
409 | break; |
410 | case 8: |
411 | reg = (reg & ~MAX6650_CFG_PRESCALER_MASK) |
412 | | MAX6650_CFG_PRESCALER_8; |
413 | break; |
414 | case 16: |
415 | reg = (reg & ~MAX6650_CFG_PRESCALER_MASK) |
416 | | MAX6650_CFG_PRESCALER_16; |
417 | break; |
418 | default: |
419 | dev_err(dev, "illegal value for prescaler (%d)\n" , prescale); |
420 | } |
421 | |
422 | dev_info(dev, "Fan voltage: %dV, prescaler: %d.\n" , |
423 | (reg & MAX6650_CFG_V12) ? 12 : 5, |
424 | 1 << (reg & MAX6650_CFG_PRESCALER_MASK)); |
425 | |
426 | err = i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, value: reg); |
427 | if (err) { |
428 | dev_err(dev, "Config write error, aborting.\n" ); |
429 | return err; |
430 | } |
431 | data->config = reg; |
432 | |
433 | reg = i2c_smbus_read_byte_data(client, MAX6650_REG_SPEED); |
434 | if (reg < 0) { |
435 | dev_err(dev, "Failed to read speed register, aborting.\n" ); |
436 | return reg; |
437 | } |
438 | data->speed = reg; |
439 | |
440 | reg = i2c_smbus_read_byte_data(client, MAX6650_REG_DAC); |
441 | if (reg < 0) { |
442 | dev_err(dev, "Failed to read DAC register, aborting.\n" ); |
443 | return reg; |
444 | } |
445 | data->dac = reg; |
446 | |
447 | reg = i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT); |
448 | if (reg < 0) { |
449 | dev_err(dev, "Failed to read count register, aborting.\n" ); |
450 | return reg; |
451 | } |
452 | data->count = reg; |
453 | |
454 | reg = i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM_EN); |
455 | if (reg < 0) { |
456 | dev_err(dev, "Failed to read alarm configuration, aborting.\n" ); |
457 | return reg; |
458 | } |
459 | data->alarm_en = reg; |
460 | |
461 | if (!of_property_read_u32(np: client->dev.of_node, propname: "maxim,fan-target-rpm" , |
462 | out_value: &target_rpm)) { |
463 | max6650_set_target(data, rpm: target_rpm); |
464 | max6650_set_operating_mode(data, MAX6650_CFG_MODE_CLOSED_LOOP); |
465 | } |
466 | |
467 | return 0; |
468 | } |
469 | |
470 | static int max6650_get_max_state(struct thermal_cooling_device *cdev, |
471 | unsigned long *state) |
472 | { |
473 | *state = 255; |
474 | |
475 | return 0; |
476 | } |
477 | |
478 | static int max6650_get_cur_state(struct thermal_cooling_device *cdev, |
479 | unsigned long *state) |
480 | { |
481 | struct max6650_data *data = cdev->devdata; |
482 | |
483 | *state = data->cooling_dev_state; |
484 | |
485 | return 0; |
486 | } |
487 | |
488 | static int max6650_set_cur_state(struct thermal_cooling_device *cdev, |
489 | unsigned long state) |
490 | { |
491 | struct max6650_data *data = cdev->devdata; |
492 | struct i2c_client *client = data->client; |
493 | int err; |
494 | |
495 | state = clamp_val(state, 0, 255); |
496 | |
497 | mutex_lock(&data->update_lock); |
498 | |
499 | data->dac = pwm_to_dac(pwm: state, v12: data->config & MAX6650_CFG_V12); |
500 | err = i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, value: data->dac); |
501 | if (!err) { |
502 | max6650_set_operating_mode(data, mode: state ? |
503 | MAX6650_CFG_MODE_OPEN_LOOP : |
504 | MAX6650_CFG_MODE_OFF); |
505 | data->cooling_dev_state = state; |
506 | } |
507 | |
508 | mutex_unlock(lock: &data->update_lock); |
509 | |
510 | return err; |
511 | } |
512 | |
513 | static const struct thermal_cooling_device_ops max6650_cooling_ops = { |
514 | .get_max_state = max6650_get_max_state, |
515 | .get_cur_state = max6650_get_cur_state, |
516 | .set_cur_state = max6650_set_cur_state, |
517 | }; |
518 | |
519 | static int max6650_read(struct device *dev, enum hwmon_sensor_types type, |
520 | u32 attr, int channel, long *val) |
521 | { |
522 | struct max6650_data *data = max6650_update_device(dev); |
523 | int mode; |
524 | |
525 | if (IS_ERR(ptr: data)) |
526 | return PTR_ERR(ptr: data); |
527 | |
528 | switch (type) { |
529 | case hwmon_pwm: |
530 | switch (attr) { |
531 | case hwmon_pwm_input: |
532 | *val = dac_to_pwm(dac: data->dac, |
533 | v12: data->config & MAX6650_CFG_V12); |
534 | break; |
535 | case hwmon_pwm_enable: |
536 | /* |
537 | * Possible values: |
538 | * 0 = Fan always on |
539 | * 1 = Open loop, Voltage is set according to speed, |
540 | * not regulated. |
541 | * 2 = Closed loop, RPM for all fans regulated by fan1 |
542 | * tachometer |
543 | * 3 = Fan off |
544 | */ |
545 | mode = (data->config & MAX6650_CFG_MODE_MASK) >> 4; |
546 | *val = (4 - mode) & 3; /* {0 1 2 3} -> {0 3 2 1} */ |
547 | break; |
548 | default: |
549 | return -EOPNOTSUPP; |
550 | } |
551 | break; |
552 | case hwmon_fan: |
553 | switch (attr) { |
554 | case hwmon_fan_input: |
555 | /* |
556 | * Calculation details: |
557 | * |
558 | * Each tachometer counts over an interval given by the |
559 | * "count" register (0.25, 0.5, 1 or 2 seconds). |
560 | * The driver assumes that the fans produce two pulses |
561 | * per revolution (this seems to be the most common). |
562 | */ |
563 | *val = DIV_ROUND_CLOSEST(data->tach[channel] * 120, |
564 | DIV_FROM_REG(data->count)); |
565 | break; |
566 | case hwmon_fan_div: |
567 | *val = DIV_FROM_REG(data->count); |
568 | break; |
569 | case hwmon_fan_target: |
570 | /* |
571 | * Use the datasheet equation: |
572 | * FanSpeed = KSCALE x fCLK / [256 x (KTACH + 1)] |
573 | * then multiply by 60 to give rpm. |
574 | */ |
575 | *val = 60 * DIV_FROM_REG(data->config) * clock / |
576 | (256 * (data->speed + 1)); |
577 | break; |
578 | case hwmon_fan_min_alarm: |
579 | *val = !!(data->alarm & MAX6650_ALRM_MIN); |
580 | data->alarm &= ~MAX6650_ALRM_MIN; |
581 | data->valid = false; |
582 | break; |
583 | case hwmon_fan_max_alarm: |
584 | *val = !!(data->alarm & MAX6650_ALRM_MAX); |
585 | data->alarm &= ~MAX6650_ALRM_MAX; |
586 | data->valid = false; |
587 | break; |
588 | case hwmon_fan_fault: |
589 | *val = !!(data->alarm & MAX6650_ALRM_TACH); |
590 | data->alarm &= ~MAX6650_ALRM_TACH; |
591 | data->valid = false; |
592 | break; |
593 | default: |
594 | return -EOPNOTSUPP; |
595 | } |
596 | break; |
597 | default: |
598 | return -EOPNOTSUPP; |
599 | } |
600 | return 0; |
601 | } |
602 | |
603 | static const u8 max6650_pwm_modes[] = { |
604 | MAX6650_CFG_MODE_ON, |
605 | MAX6650_CFG_MODE_OPEN_LOOP, |
606 | MAX6650_CFG_MODE_CLOSED_LOOP, |
607 | MAX6650_CFG_MODE_OFF, |
608 | }; |
609 | |
610 | static int max6650_write(struct device *dev, enum hwmon_sensor_types type, |
611 | u32 attr, int channel, long val) |
612 | { |
613 | struct max6650_data *data = dev_get_drvdata(dev); |
614 | int ret = 0; |
615 | u8 reg; |
616 | |
617 | mutex_lock(&data->update_lock); |
618 | |
619 | switch (type) { |
620 | case hwmon_pwm: |
621 | switch (attr) { |
622 | case hwmon_pwm_input: |
623 | reg = pwm_to_dac(clamp_val(val, 0, 255), |
624 | v12: data->config & MAX6650_CFG_V12); |
625 | ret = i2c_smbus_write_byte_data(client: data->client, |
626 | MAX6650_REG_DAC, value: reg); |
627 | if (ret) |
628 | break; |
629 | data->dac = reg; |
630 | break; |
631 | case hwmon_pwm_enable: |
632 | if (val < 0 || val >= ARRAY_SIZE(max6650_pwm_modes)) { |
633 | ret = -EINVAL; |
634 | break; |
635 | } |
636 | ret = max6650_set_operating_mode(data, |
637 | mode: max6650_pwm_modes[val]); |
638 | break; |
639 | default: |
640 | ret = -EOPNOTSUPP; |
641 | break; |
642 | } |
643 | break; |
644 | case hwmon_fan: |
645 | switch (attr) { |
646 | case hwmon_fan_div: |
647 | switch (val) { |
648 | case 1: |
649 | reg = 0; |
650 | break; |
651 | case 2: |
652 | reg = 1; |
653 | break; |
654 | case 4: |
655 | reg = 2; |
656 | break; |
657 | case 8: |
658 | reg = 3; |
659 | break; |
660 | default: |
661 | ret = -EINVAL; |
662 | goto error; |
663 | } |
664 | ret = i2c_smbus_write_byte_data(client: data->client, |
665 | MAX6650_REG_COUNT, value: reg); |
666 | if (ret) |
667 | break; |
668 | data->count = reg; |
669 | break; |
670 | case hwmon_fan_target: |
671 | if (val < 0) { |
672 | ret = -EINVAL; |
673 | break; |
674 | } |
675 | ret = max6650_set_target(data, rpm: val); |
676 | break; |
677 | default: |
678 | ret = -EOPNOTSUPP; |
679 | break; |
680 | } |
681 | break; |
682 | default: |
683 | ret = -EOPNOTSUPP; |
684 | break; |
685 | } |
686 | |
687 | error: |
688 | mutex_unlock(lock: &data->update_lock); |
689 | return ret; |
690 | } |
691 | |
692 | static umode_t max6650_is_visible(const void *_data, |
693 | enum hwmon_sensor_types type, u32 attr, |
694 | int channel) |
695 | { |
696 | const struct max6650_data *data = _data; |
697 | |
698 | if (channel && (channel >= data->nr_fans || type != hwmon_fan)) |
699 | return 0; |
700 | |
701 | switch (type) { |
702 | case hwmon_fan: |
703 | switch (attr) { |
704 | case hwmon_fan_input: |
705 | return 0444; |
706 | case hwmon_fan_target: |
707 | case hwmon_fan_div: |
708 | return 0644; |
709 | case hwmon_fan_min_alarm: |
710 | if (data->alarm_en & MAX6650_ALRM_MIN) |
711 | return 0444; |
712 | break; |
713 | case hwmon_fan_max_alarm: |
714 | if (data->alarm_en & MAX6650_ALRM_MAX) |
715 | return 0444; |
716 | break; |
717 | case hwmon_fan_fault: |
718 | if (data->alarm_en & MAX6650_ALRM_TACH) |
719 | return 0444; |
720 | break; |
721 | default: |
722 | break; |
723 | } |
724 | break; |
725 | case hwmon_pwm: |
726 | switch (attr) { |
727 | case hwmon_pwm_input: |
728 | case hwmon_pwm_enable: |
729 | return 0644; |
730 | default: |
731 | break; |
732 | } |
733 | break; |
734 | default: |
735 | break; |
736 | } |
737 | return 0; |
738 | } |
739 | |
740 | static const struct hwmon_channel_info * const max6650_info[] = { |
741 | HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_DIV | |
742 | HWMON_F_MIN_ALARM | HWMON_F_MAX_ALARM | |
743 | HWMON_F_FAULT, |
744 | HWMON_F_INPUT, HWMON_F_INPUT, HWMON_F_INPUT), |
745 | HWMON_CHANNEL_INFO(pwm, HWMON_PWM_INPUT | HWMON_PWM_ENABLE), |
746 | NULL |
747 | }; |
748 | |
749 | static const struct hwmon_ops max6650_hwmon_ops = { |
750 | .read = max6650_read, |
751 | .write = max6650_write, |
752 | .is_visible = max6650_is_visible, |
753 | }; |
754 | |
755 | static const struct hwmon_chip_info max6650_chip_info = { |
756 | .ops = &max6650_hwmon_ops, |
757 | .info = max6650_info, |
758 | }; |
759 | |
760 | static const struct i2c_device_id max6650_id[]; |
761 | |
762 | static int max6650_probe(struct i2c_client *client) |
763 | { |
764 | struct thermal_cooling_device *cooling_dev; |
765 | struct device *dev = &client->dev; |
766 | struct max6650_data *data; |
767 | struct device *hwmon_dev; |
768 | int err; |
769 | |
770 | data = devm_kzalloc(dev, size: sizeof(struct max6650_data), GFP_KERNEL); |
771 | if (!data) |
772 | return -ENOMEM; |
773 | |
774 | data->client = client; |
775 | i2c_set_clientdata(client, data); |
776 | mutex_init(&data->update_lock); |
777 | |
778 | data->nr_fans = (uintptr_t)i2c_get_match_data(client); |
779 | |
780 | /* |
781 | * Initialize the max6650 chip |
782 | */ |
783 | err = max6650_init_client(data, client); |
784 | if (err) |
785 | return err; |
786 | |
787 | hwmon_dev = devm_hwmon_device_register_with_info(dev, |
788 | name: client->name, drvdata: data, |
789 | info: &max6650_chip_info, |
790 | extra_groups: max6650_groups); |
791 | err = PTR_ERR_OR_ZERO(ptr: hwmon_dev); |
792 | if (err) |
793 | return err; |
794 | |
795 | if (IS_ENABLED(CONFIG_THERMAL)) { |
796 | cooling_dev = devm_thermal_of_cooling_device_register(dev, |
797 | np: dev->of_node, type: client->name, |
798 | devdata: data, ops: &max6650_cooling_ops); |
799 | if (IS_ERR(ptr: cooling_dev)) { |
800 | dev_warn(dev, "thermal cooling device register failed: %ld\n" , |
801 | PTR_ERR(cooling_dev)); |
802 | } |
803 | } |
804 | |
805 | return 0; |
806 | } |
807 | |
808 | static const struct i2c_device_id max6650_id[] = { |
809 | { "max6650" , 1 }, |
810 | { "max6651" , 4 }, |
811 | { } |
812 | }; |
813 | MODULE_DEVICE_TABLE(i2c, max6650_id); |
814 | |
815 | static struct i2c_driver max6650_driver = { |
816 | .driver = { |
817 | .name = "max6650" , |
818 | .of_match_table = of_match_ptr(max6650_dt_match), |
819 | }, |
820 | .probe = max6650_probe, |
821 | .id_table = max6650_id, |
822 | }; |
823 | |
824 | module_i2c_driver(max6650_driver); |
825 | |
826 | MODULE_AUTHOR("Hans J. Koch" ); |
827 | MODULE_DESCRIPTION("MAX6650 sensor driver" ); |
828 | MODULE_LICENSE("GPL" ); |
829 | |