Commit | Line | Data |
---|---|---|
74ba9207 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
d20620de HJK |
2 | /* |
3 | * max6650.c - Part of lm_sensors, Linux kernel modules for hardware | |
4 | * monitoring. | |
5 | * | |
2aa25c22 | 6 | * (C) 2007 by Hans J. Koch <hjk@hansjkoch.de> |
d20620de HJK |
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 | * | |
52b5226f | 16 | * The datasheet was last seen at: |
d20620de HJK |
17 | * |
18 | * http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf | |
d20620de HJK |
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> | |
a6cdeefe | 29 | #include <linux/of_device.h> |
4f8d374b | 30 | #include <linux/thermal.h> |
d20620de | 31 | |
d20620de HJK |
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; | |
a6cdeefe | 40 | /* clock: The clock frequency of the chip (max6651 can be clocked externally) */ |
d20620de HJK |
41 | static int clock = 254000; |
42 | ||
0f50b2e8 GR |
43 | module_param(fan_voltage, int, 0444); |
44 | module_param(prescaler, int, 0444); | |
45 | module_param(clock, int, 0444); | |
d20620de | 46 | |
d20620de HJK |
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 | ||
52b5226f CE |
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 | ||
d20620de HJK |
91 | /* Minimum and maximum values of the FAN-RPM */ |
92 | #define FAN_RPM_MIN 240 | |
93 | #define FAN_RPM_MAX 30000 | |
94 | ||
b2905bb8 GR |
95 | #define DIV_FROM_REG(reg) (1 << ((reg) & 7)) |
96 | #define DAC_LIMIT(v12) ((v12) ? 180 : 76) | |
d20620de | 97 | |
d20620de HJK |
98 | /* |
99 | * Client data (each client gets its own) | |
100 | */ | |
101 | ||
bafda5d0 | 102 | struct max6650_data { |
17eaa25c | 103 | struct i2c_client *client; |
228b9e19 | 104 | struct mutex update_lock; /* protect alarm register updates */ |
9c084dae | 105 | int nr_fans; |
bf8c9eda | 106 | bool valid; /* false until following fields are valid */ |
d20620de HJK |
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; | |
52b5226f | 115 | u8 alarm; |
f5b20b11 | 116 | u8 alarm_en; |
4f8d374b | 117 | unsigned long cooling_dev_state; |
d20620de HJK |
118 | }; |
119 | ||
1577f94b GR |
120 | static const u8 tach_reg[] = { |
121 | MAX6650_REG_TACH0, | |
122 | MAX6650_REG_TACH1, | |
123 | MAX6650_REG_TACH2, | |
124 | MAX6650_REG_TACH3, | |
125 | }; | |
126 | ||
2720ce7e | 127 | static const struct of_device_id __maybe_unused max6650_dt_match[] = { |
a6cdeefe ML |
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 | ||
b2905bb8 GR |
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 | ||
1577f94b GR |
156 | static struct max6650_data *max6650_update_device(struct device *dev) |
157 | { | |
17eaa25c GR |
158 | struct max6650_data *data = dev_get_drvdata(dev); |
159 | struct i2c_client *client = data->client; | |
0c4a71d3 | 160 | int reg, err = 0; |
1577f94b | 161 | int i; |
1577f94b GR |
162 | |
163 | mutex_lock(&data->update_lock); | |
164 | ||
165 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { | |
1577f94b | 166 | for (i = 0; i < data->nr_fans; i++) { |
0c4a71d3 GR |
167 | reg = i2c_smbus_read_byte_data(client, tach_reg[i]); |
168 | if (reg < 0) { | |
169 | err = reg; | |
170 | goto error; | |
171 | } | |
172 | data->tach[i] = reg; | |
1577f94b | 173 | } |
1577f94b GR |
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 | */ | |
0c4a71d3 GR |
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; | |
1577f94b | 186 | data->last_updated = jiffies; |
bf8c9eda | 187 | data->valid = true; |
1577f94b GR |
188 | } |
189 | ||
0c4a71d3 | 190 | error: |
1577f94b | 191 | mutex_unlock(&data->update_lock); |
0c4a71d3 GR |
192 | if (err) |
193 | data = ERR_PTR(err); | |
1577f94b GR |
194 | return data; |
195 | } | |
196 | ||
20005cc5 ML |
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(data->client, MAX6650_REG_CONFIG, | |
212 | config); | |
213 | if (result < 0) | |
214 | return result; | |
215 | ||
216 | data->config = config; | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
d20620de HJK |
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 | ||
20005cc5 | 262 | static int max6650_set_target(struct max6650_data *data, unsigned long rpm) |
d20620de | 263 | { |
d20620de | 264 | int kscale, ktach; |
bafda5d0 | 265 | |
20005cc5 ML |
266 | if (rpm == 0) |
267 | return max6650_set_operating_mode(data, MAX6650_CFG_MODE_OFF); | |
d20620de | 268 | |
2a844c14 | 269 | rpm = clamp_val(rpm, FAN_RPM_MIN, FAN_RPM_MAX); |
d20620de HJK |
270 | |
271 | /* | |
703af960 GR |
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 | */ | |
d20620de | 277 | |
d20620de HJK |
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 | ||
20005cc5 ML |
286 | return i2c_smbus_write_byte_data(data->client, MAX6650_REG_SPEED, |
287 | data->speed); | |
288 | } | |
289 | ||
d20620de | 290 | /* |
e193acb3 | 291 | * Get gpio alarm status: |
52b5226f CE |
292 | * Possible values: |
293 | * 0 = no alarm | |
294 | * 1 = alarm | |
295 | */ | |
296 | ||
44007117 GR |
297 | static ssize_t alarm_show(struct device *dev, |
298 | struct device_attribute *devattr, char *buf) | |
52b5226f CE |
299 | { |
300 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
301 | struct max6650_data *data = max6650_update_device(dev); | |
0c4a71d3 | 302 | bool alarm; |
52b5226f | 303 | |
0c4a71d3 GR |
304 | if (IS_ERR(data)) |
305 | return PTR_ERR(data); | |
306 | ||
307 | alarm = data->alarm & attr->index; | |
0d5cc938 | 308 | if (alarm) { |
52b5226f | 309 | mutex_lock(&data->update_lock); |
52b5226f | 310 | data->alarm &= ~attr->index; |
0d5cc938 | 311 | data->valid = false; |
52b5226f CE |
312 | mutex_unlock(&data->update_lock); |
313 | } | |
314 | ||
315 | return sprintf(buf, "%d\n", alarm); | |
316 | } | |
317 | ||
44007117 GR |
318 | static SENSOR_DEVICE_ATTR_RO(gpio1_alarm, alarm, MAX6650_ALRM_GPIO1); |
319 | static SENSOR_DEVICE_ATTR_RO(gpio2_alarm, alarm, MAX6650_ALRM_GPIO2); | |
52b5226f | 320 | |
587a1f16 | 321 | static umode_t max6650_attrs_visible(struct kobject *kobj, struct attribute *a, |
228b9e19 | 322 | int n) |
52b5226f | 323 | { |
f1fc688c | 324 | struct device *dev = kobj_to_dev(kobj); |
17eaa25c | 325 | struct max6650_data *data = dev_get_drvdata(dev); |
52b5226f | 326 | struct device_attribute *devattr; |
d20620de | 327 | |
52b5226f CE |
328 | /* |
329 | * Hide the alarms that have not been enabled by the firmware | |
330 | */ | |
331 | ||
332 | devattr = container_of(a, struct device_attribute, attr); | |
e193acb3 GR |
333 | if (devattr == &sensor_dev_attr_gpio1_alarm.dev_attr || |
334 | devattr == &sensor_dev_attr_gpio2_alarm.dev_attr) { | |
f5b20b11 | 335 | if (!(data->alarm_en & to_sensor_dev_attr(devattr)->index)) |
52b5226f CE |
336 | return 0; |
337 | } | |
338 | ||
339 | return a->mode; | |
340 | } | |
d20620de HJK |
341 | |
342 | static struct attribute *max6650_attrs[] = { | |
52b5226f CE |
343 | &sensor_dev_attr_gpio1_alarm.dev_attr.attr, |
344 | &sensor_dev_attr_gpio2_alarm.dev_attr.attr, | |
d20620de HJK |
345 | NULL |
346 | }; | |
347 | ||
17eaa25c | 348 | static const struct attribute_group max6650_group = { |
d20620de | 349 | .attrs = max6650_attrs, |
52b5226f | 350 | .is_visible = max6650_attrs_visible, |
d20620de HJK |
351 | }; |
352 | ||
e193acb3 GR |
353 | static const struct attribute_group *max6650_groups[] = { |
354 | &max6650_group, | |
9c084dae JD |
355 | NULL |
356 | }; | |
357 | ||
17eaa25c GR |
358 | static int max6650_init_client(struct max6650_data *data, |
359 | struct i2c_client *client) | |
d20620de | 360 | { |
71ba0f31 | 361 | struct device *dev = &client->dev; |
b9d8de4a GR |
362 | int reg; |
363 | int err; | |
a6cdeefe ML |
364 | u32 voltage; |
365 | u32 prescale; | |
20005cc5 | 366 | u32 target_rpm; |
a6cdeefe ML |
367 | |
368 | if (of_property_read_u32(dev->of_node, "maxim,fan-microvolt", | |
369 | &voltage)) | |
370 | voltage = fan_voltage; | |
371 | else | |
372 | voltage /= 1000000; /* Microvolts to volts */ | |
373 | if (of_property_read_u32(dev->of_node, "maxim,fan-prescale", | |
374 | &prescale)) | |
375 | prescale = prescaler; | |
d20620de | 376 | |
b9d8de4a GR |
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; | |
d20620de HJK |
381 | } |
382 | ||
a6cdeefe | 383 | switch (voltage) { |
bafda5d0 GR |
384 | case 0: |
385 | break; | |
386 | case 5: | |
b9d8de4a | 387 | reg &= ~MAX6650_CFG_V12; |
bafda5d0 GR |
388 | break; |
389 | case 12: | |
b9d8de4a | 390 | reg |= MAX6650_CFG_V12; |
bafda5d0 GR |
391 | break; |
392 | default: | |
a6cdeefe | 393 | dev_err(dev, "illegal value for fan_voltage (%d)\n", voltage); |
d20620de HJK |
394 | } |
395 | ||
a6cdeefe | 396 | switch (prescale) { |
bafda5d0 GR |
397 | case 0: |
398 | break; | |
399 | case 1: | |
b9d8de4a | 400 | reg &= ~MAX6650_CFG_PRESCALER_MASK; |
bafda5d0 GR |
401 | break; |
402 | case 2: | |
b9d8de4a | 403 | reg = (reg & ~MAX6650_CFG_PRESCALER_MASK) |
bafda5d0 GR |
404 | | MAX6650_CFG_PRESCALER_2; |
405 | break; | |
406 | case 4: | |
b9d8de4a | 407 | reg = (reg & ~MAX6650_CFG_PRESCALER_MASK) |
bafda5d0 GR |
408 | | MAX6650_CFG_PRESCALER_4; |
409 | break; | |
410 | case 8: | |
b9d8de4a | 411 | reg = (reg & ~MAX6650_CFG_PRESCALER_MASK) |
bafda5d0 GR |
412 | | MAX6650_CFG_PRESCALER_8; |
413 | break; | |
414 | case 16: | |
b9d8de4a | 415 | reg = (reg & ~MAX6650_CFG_PRESCALER_MASK) |
bafda5d0 GR |
416 | | MAX6650_CFG_PRESCALER_16; |
417 | break; | |
418 | default: | |
a6cdeefe | 419 | dev_err(dev, "illegal value for prescaler (%d)\n", prescale); |
d20620de HJK |
420 | } |
421 | ||
a6cdeefe | 422 | dev_info(dev, "Fan voltage: %dV, prescaler: %d.\n", |
b9d8de4a GR |
423 | (reg & MAX6650_CFG_V12) ? 12 : 5, |
424 | 1 << (reg & MAX6650_CFG_PRESCALER_MASK)); | |
d20620de | 425 | |
b9d8de4a GR |
426 | err = i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, reg); |
427 | if (err) { | |
71ba0f31 | 428 | dev_err(dev, "Config write error, aborting.\n"); |
d20620de HJK |
429 | return err; |
430 | } | |
b9d8de4a | 431 | data->config = reg; |
62dbe505 GR |
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 | ||
b9d8de4a GR |
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; | |
d20620de | 453 | |
f5b20b11 GR |
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 | ||
20005cc5 ML |
461 | if (!of_property_read_u32(client->dev.of_node, "maxim,fan-target-rpm", |
462 | &target_rpm)) { | |
463 | max6650_set_target(data, target_rpm); | |
464 | max6650_set_operating_mode(data, MAX6650_CFG_MODE_CLOSED_LOOP); | |
465 | } | |
466 | ||
d20620de HJK |
467 | return 0; |
468 | } | |
469 | ||
4f8d374b JFD |
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 | ||
b2905bb8 | 499 | data->dac = pwm_to_dac(state, data->config & MAX6650_CFG_V12); |
4f8d374b | 500 | err = i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, data->dac); |
4f8d374b JFD |
501 | if (!err) { |
502 | max6650_set_operating_mode(data, state ? | |
228b9e19 GR |
503 | MAX6650_CFG_MODE_OPEN_LOOP : |
504 | MAX6650_CFG_MODE_OFF); | |
4f8d374b JFD |
505 | data->cooling_dev_state = state; |
506 | } | |
507 | ||
508 | mutex_unlock(&data->update_lock); | |
509 | ||
b2905bb8 | 510 | return err; |
4f8d374b JFD |
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 | }; | |
4f8d374b | 518 | |
e193acb3 GR |
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 | ||
0c4a71d3 GR |
525 | if (IS_ERR(data)) |
526 | return PTR_ERR(data); | |
527 | ||
e193acb3 GR |
528 | switch (type) { |
529 | case hwmon_pwm: | |
530 | switch (attr) { | |
531 | case hwmon_pwm_input: | |
532 | *val = dac_to_pwm(data->dac, | |
533 | 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 | data->config & MAX6650_CFG_V12); | |
625 | ret = i2c_smbus_write_byte_data(data->client, | |
626 | MAX6650_REG_DAC, 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 | 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(data->client, | |
665 | MAX6650_REG_COUNT, 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, 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(&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 *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 | ||
67487038 SK |
760 | static const struct i2c_device_id max6650_id[]; |
761 | ||
762 | static int max6650_probe(struct i2c_client *client) | |
d20620de | 763 | { |
8e5e7ddd | 764 | struct thermal_cooling_device *cooling_dev; |
71ba0f31 | 765 | struct device *dev = &client->dev; |
a6cdeefe ML |
766 | const struct of_device_id *of_id = |
767 | of_match_device(of_match_ptr(max6650_dt_match), dev); | |
1577f94b | 768 | struct max6650_data *data; |
17eaa25c | 769 | struct device *hwmon_dev; |
1577f94b | 770 | int err; |
d20620de | 771 | |
71ba0f31 | 772 | data = devm_kzalloc(dev, sizeof(struct max6650_data), GFP_KERNEL); |
0b5e33b6 | 773 | if (!data) |
1577f94b | 774 | return -ENOMEM; |
d20620de | 775 | |
17eaa25c | 776 | data->client = client; |
4f8d374b | 777 | i2c_set_clientdata(client, data); |
1577f94b | 778 | mutex_init(&data->update_lock); |
67487038 SK |
779 | data->nr_fans = of_id ? (int)(uintptr_t)of_id->data : |
780 | i2c_match_id(max6650_id, client)->driver_data; | |
d20620de | 781 | |
1577f94b GR |
782 | /* |
783 | * Initialize the max6650 chip | |
784 | */ | |
17eaa25c | 785 | err = max6650_init_client(data, client); |
1577f94b GR |
786 | if (err) |
787 | return err; | |
52b5226f | 788 | |
e193acb3 GR |
789 | hwmon_dev = devm_hwmon_device_register_with_info(dev, |
790 | client->name, data, | |
791 | &max6650_chip_info, | |
792 | max6650_groups); | |
4f8d374b JFD |
793 | err = PTR_ERR_OR_ZERO(hwmon_dev); |
794 | if (err) | |
795 | return err; | |
796 | ||
3253854d AB |
797 | if (IS_ENABLED(CONFIG_THERMAL)) { |
798 | cooling_dev = devm_thermal_of_cooling_device_register(dev, | |
799 | dev->of_node, client->name, | |
800 | data, &max6650_cooling_ops); | |
801 | if (IS_ERR(cooling_dev)) { | |
802 | dev_warn(dev, "thermal cooling device register failed: %ld\n", | |
803 | PTR_ERR(cooling_dev)); | |
804 | } | |
8e5e7ddd | 805 | } |
3253854d | 806 | |
4f8d374b JFD |
807 | return 0; |
808 | } | |
809 | ||
1577f94b GR |
810 | static const struct i2c_device_id max6650_id[] = { |
811 | { "max6650", 1 }, | |
812 | { "max6651", 4 }, | |
813 | { } | |
814 | }; | |
815 | MODULE_DEVICE_TABLE(i2c, max6650_id); | |
816 | ||
817 | static struct i2c_driver max6650_driver = { | |
818 | .driver = { | |
819 | .name = "max6650", | |
a6cdeefe | 820 | .of_match_table = of_match_ptr(max6650_dt_match), |
1577f94b | 821 | }, |
67487038 | 822 | .probe_new = max6650_probe, |
1577f94b GR |
823 | .id_table = max6650_id, |
824 | }; | |
825 | ||
f0967eea | 826 | module_i2c_driver(max6650_driver); |
d20620de HJK |
827 | |
828 | MODULE_AUTHOR("Hans J. Koch"); | |
829 | MODULE_DESCRIPTION("MAX6650 sensor driver"); | |
830 | MODULE_LICENSE("GPL"); |