1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Windfarm PowerMac thermal control. FCU fan control |
4 | * |
5 | * Copyright 2012 Benjamin Herrenschmidt, IBM Corp. |
6 | */ |
7 | #undef DEBUG |
8 | |
9 | #include <linux/types.h> |
10 | #include <linux/errno.h> |
11 | #include <linux/kernel.h> |
12 | #include <linux/delay.h> |
13 | #include <linux/slab.h> |
14 | #include <linux/init.h> |
15 | #include <linux/wait.h> |
16 | #include <linux/i2c.h> |
17 | |
18 | #include <asm/machdep.h> |
19 | #include <asm/io.h> |
20 | #include <asm/sections.h> |
21 | |
22 | #include "windfarm.h" |
23 | #include "windfarm_mpu.h" |
24 | |
25 | #define VERSION "1.0" |
26 | |
27 | #ifdef DEBUG |
28 | #define DBG(args...) printk(args) |
29 | #else |
30 | #define DBG(args...) do { } while(0) |
31 | #endif |
32 | |
33 | /* |
34 | * This option is "weird" :) Basically, if you define this to 1 |
35 | * the control loop for the RPMs fans (not PWMs) will apply the |
36 | * correction factor obtained from the PID to the actual RPM |
37 | * speed read from the FCU. |
38 | * |
39 | * If you define the below constant to 0, then it will be |
40 | * applied to the setpoint RPM speed, that is basically the |
41 | * speed we proviously "asked" for. |
42 | * |
43 | * I'm using 0 for now which is what therm_pm72 used to do and |
44 | * what Darwin -apparently- does based on observed behaviour. |
45 | */ |
46 | #define RPM_PID_USE_ACTUAL_SPEED 0 |
47 | |
48 | /* Default min/max for pumps */ |
49 | #define CPU_PUMP_OUTPUT_MAX 3200 |
50 | #define CPU_PUMP_OUTPUT_MIN 1250 |
51 | |
52 | #define FCU_FAN_RPM 0 |
53 | #define FCU_FAN_PWM 1 |
54 | |
55 | struct wf_fcu_priv { |
56 | struct kref ref; |
57 | struct i2c_client *i2c; |
58 | struct mutex lock; |
59 | struct list_head fan_list; |
60 | int rpm_shift; |
61 | }; |
62 | |
63 | struct wf_fcu_fan { |
64 | struct list_head link; |
65 | int id; |
66 | s32 min, max, target; |
67 | struct wf_fcu_priv *fcu_priv; |
68 | struct wf_control ctrl; |
69 | }; |
70 | |
71 | static void wf_fcu_release(struct kref *ref) |
72 | { |
73 | struct wf_fcu_priv *pv = container_of(ref, struct wf_fcu_priv, ref); |
74 | |
75 | kfree(objp: pv); |
76 | } |
77 | |
78 | static void wf_fcu_fan_release(struct wf_control *ct) |
79 | { |
80 | struct wf_fcu_fan *fan = ct->priv; |
81 | |
82 | kref_put(kref: &fan->fcu_priv->ref, release: wf_fcu_release); |
83 | kfree(objp: fan); |
84 | } |
85 | |
86 | static int wf_fcu_read_reg(struct wf_fcu_priv *pv, int reg, |
87 | unsigned char *buf, int nb) |
88 | { |
89 | int tries, nr, nw; |
90 | |
91 | mutex_lock(&pv->lock); |
92 | |
93 | buf[0] = reg; |
94 | tries = 0; |
95 | for (;;) { |
96 | nw = i2c_master_send(client: pv->i2c, buf, count: 1); |
97 | if (nw > 0 || (nw < 0 && nw != -EIO) || tries >= 100) |
98 | break; |
99 | msleep(msecs: 10); |
100 | ++tries; |
101 | } |
102 | if (nw <= 0) { |
103 | pr_err("Failure writing address to FCU: %d" , nw); |
104 | nr = nw; |
105 | goto bail; |
106 | } |
107 | tries = 0; |
108 | for (;;) { |
109 | nr = i2c_master_recv(client: pv->i2c, buf, count: nb); |
110 | if (nr > 0 || (nr < 0 && nr != -ENODEV) || tries >= 100) |
111 | break; |
112 | msleep(msecs: 10); |
113 | ++tries; |
114 | } |
115 | if (nr <= 0) |
116 | pr_err("wf_fcu: Failure reading data from FCU: %d" , nw); |
117 | bail: |
118 | mutex_unlock(lock: &pv->lock); |
119 | return nr; |
120 | } |
121 | |
122 | static int wf_fcu_write_reg(struct wf_fcu_priv *pv, int reg, |
123 | const unsigned char *ptr, int nb) |
124 | { |
125 | int tries, nw; |
126 | unsigned char buf[16]; |
127 | |
128 | buf[0] = reg; |
129 | memcpy(buf+1, ptr, nb); |
130 | ++nb; |
131 | tries = 0; |
132 | for (;;) { |
133 | nw = i2c_master_send(client: pv->i2c, buf, count: nb); |
134 | if (nw > 0 || (nw < 0 && nw != -EIO) || tries >= 100) |
135 | break; |
136 | msleep(msecs: 10); |
137 | ++tries; |
138 | } |
139 | if (nw < 0) |
140 | pr_err("wf_fcu: Failure writing to FCU: %d" , nw); |
141 | return nw; |
142 | } |
143 | |
144 | static int wf_fcu_fan_set_rpm(struct wf_control *ct, s32 value) |
145 | { |
146 | struct wf_fcu_fan *fan = ct->priv; |
147 | struct wf_fcu_priv *pv = fan->fcu_priv; |
148 | int rc, shift = pv->rpm_shift; |
149 | unsigned char buf[2]; |
150 | |
151 | if (value < fan->min) |
152 | value = fan->min; |
153 | if (value > fan->max) |
154 | value = fan->max; |
155 | |
156 | fan->target = value; |
157 | |
158 | buf[0] = value >> (8 - shift); |
159 | buf[1] = value << shift; |
160 | rc = wf_fcu_write_reg(pv, reg: 0x10 + (fan->id * 2), ptr: buf, nb: 2); |
161 | if (rc < 0) |
162 | return -EIO; |
163 | return 0; |
164 | } |
165 | |
166 | static int wf_fcu_fan_get_rpm(struct wf_control *ct, s32 *value) |
167 | { |
168 | struct wf_fcu_fan *fan = ct->priv; |
169 | struct wf_fcu_priv *pv = fan->fcu_priv; |
170 | int rc, reg_base, shift = pv->rpm_shift; |
171 | unsigned char failure; |
172 | unsigned char active; |
173 | unsigned char buf[2]; |
174 | |
175 | rc = wf_fcu_read_reg(pv, reg: 0xb, buf: &failure, nb: 1); |
176 | if (rc != 1) |
177 | return -EIO; |
178 | if ((failure & (1 << fan->id)) != 0) |
179 | return -EFAULT; |
180 | rc = wf_fcu_read_reg(pv, reg: 0xd, buf: &active, nb: 1); |
181 | if (rc != 1) |
182 | return -EIO; |
183 | if ((active & (1 << fan->id)) == 0) |
184 | return -ENXIO; |
185 | |
186 | /* Programmed value or real current speed */ |
187 | #if RPM_PID_USE_ACTUAL_SPEED |
188 | reg_base = 0x11; |
189 | #else |
190 | reg_base = 0x10; |
191 | #endif |
192 | rc = wf_fcu_read_reg(pv, reg: reg_base + (fan->id * 2), buf, nb: 2); |
193 | if (rc != 2) |
194 | return -EIO; |
195 | |
196 | *value = (buf[0] << (8 - shift)) | buf[1] >> shift; |
197 | |
198 | return 0; |
199 | } |
200 | |
201 | static int wf_fcu_fan_set_pwm(struct wf_control *ct, s32 value) |
202 | { |
203 | struct wf_fcu_fan *fan = ct->priv; |
204 | struct wf_fcu_priv *pv = fan->fcu_priv; |
205 | unsigned char buf[2]; |
206 | int rc; |
207 | |
208 | if (value < fan->min) |
209 | value = fan->min; |
210 | if (value > fan->max) |
211 | value = fan->max; |
212 | |
213 | fan->target = value; |
214 | |
215 | value = (value * 2559) / 1000; |
216 | buf[0] = value; |
217 | rc = wf_fcu_write_reg(pv, reg: 0x30 + (fan->id * 2), ptr: buf, nb: 1); |
218 | if (rc < 0) |
219 | return -EIO; |
220 | return 0; |
221 | } |
222 | |
223 | static int wf_fcu_fan_get_pwm(struct wf_control *ct, s32 *value) |
224 | { |
225 | struct wf_fcu_fan *fan = ct->priv; |
226 | struct wf_fcu_priv *pv = fan->fcu_priv; |
227 | unsigned char failure; |
228 | unsigned char active; |
229 | unsigned char buf[2]; |
230 | int rc; |
231 | |
232 | rc = wf_fcu_read_reg(pv, reg: 0x2b, buf: &failure, nb: 1); |
233 | if (rc != 1) |
234 | return -EIO; |
235 | if ((failure & (1 << fan->id)) != 0) |
236 | return -EFAULT; |
237 | rc = wf_fcu_read_reg(pv, reg: 0x2d, buf: &active, nb: 1); |
238 | if (rc != 1) |
239 | return -EIO; |
240 | if ((active & (1 << fan->id)) == 0) |
241 | return -ENXIO; |
242 | |
243 | rc = wf_fcu_read_reg(pv, reg: 0x30 + (fan->id * 2), buf, nb: 1); |
244 | if (rc != 1) |
245 | return -EIO; |
246 | |
247 | *value = (((s32)buf[0]) * 1000) / 2559; |
248 | |
249 | return 0; |
250 | } |
251 | |
252 | static s32 wf_fcu_fan_min(struct wf_control *ct) |
253 | { |
254 | struct wf_fcu_fan *fan = ct->priv; |
255 | |
256 | return fan->min; |
257 | } |
258 | |
259 | static s32 wf_fcu_fan_max(struct wf_control *ct) |
260 | { |
261 | struct wf_fcu_fan *fan = ct->priv; |
262 | |
263 | return fan->max; |
264 | } |
265 | |
266 | static const struct wf_control_ops wf_fcu_fan_rpm_ops = { |
267 | .set_value = wf_fcu_fan_set_rpm, |
268 | .get_value = wf_fcu_fan_get_rpm, |
269 | .get_min = wf_fcu_fan_min, |
270 | .get_max = wf_fcu_fan_max, |
271 | .release = wf_fcu_fan_release, |
272 | .owner = THIS_MODULE, |
273 | }; |
274 | |
275 | static const struct wf_control_ops wf_fcu_fan_pwm_ops = { |
276 | .set_value = wf_fcu_fan_set_pwm, |
277 | .get_value = wf_fcu_fan_get_pwm, |
278 | .get_min = wf_fcu_fan_min, |
279 | .get_max = wf_fcu_fan_max, |
280 | .release = wf_fcu_fan_release, |
281 | .owner = THIS_MODULE, |
282 | }; |
283 | |
284 | static void wf_fcu_get_pump_minmax(struct wf_fcu_fan *fan) |
285 | { |
286 | const struct mpu_data *mpu = wf_get_mpu(cpu: 0); |
287 | u16 pump_min = 0, pump_max = 0xffff; |
288 | u16 tmp[4]; |
289 | |
290 | /* Try to fetch pumps min/max infos from eeprom */ |
291 | if (mpu) { |
292 | memcpy(&tmp, mpu->processor_part_num, 8); |
293 | if (tmp[0] != 0xffff && tmp[1] != 0xffff) { |
294 | pump_min = max(pump_min, tmp[0]); |
295 | pump_max = min(pump_max, tmp[1]); |
296 | } |
297 | if (tmp[2] != 0xffff && tmp[3] != 0xffff) { |
298 | pump_min = max(pump_min, tmp[2]); |
299 | pump_max = min(pump_max, tmp[3]); |
300 | } |
301 | } |
302 | |
303 | /* Double check the values, this _IS_ needed as the EEPROM on |
304 | * some dual 2.5Ghz G5s seem, at least, to have both min & max |
305 | * same to the same value ... (grrrr) |
306 | */ |
307 | if (pump_min == pump_max || pump_min == 0 || pump_max == 0xffff) { |
308 | pump_min = CPU_PUMP_OUTPUT_MIN; |
309 | pump_max = CPU_PUMP_OUTPUT_MAX; |
310 | } |
311 | |
312 | fan->min = pump_min; |
313 | fan->max = pump_max; |
314 | |
315 | DBG("wf_fcu: pump min/max for %s set to: [%d..%d] RPM\n" , |
316 | fan->ctrl.name, pump_min, pump_max); |
317 | } |
318 | |
319 | static void wf_fcu_get_rpmfan_minmax(struct wf_fcu_fan *fan) |
320 | { |
321 | struct wf_fcu_priv *pv = fan->fcu_priv; |
322 | const struct mpu_data *mpu0 = wf_get_mpu(cpu: 0); |
323 | const struct mpu_data *mpu1 = wf_get_mpu(cpu: 1); |
324 | |
325 | /* Default */ |
326 | fan->min = 2400 >> pv->rpm_shift; |
327 | fan->max = 56000 >> pv->rpm_shift; |
328 | |
329 | /* CPU fans have min/max in MPU */ |
330 | if (mpu0 && !strcmp(fan->ctrl.name, "cpu-front-fan-0" )) { |
331 | fan->min = max(fan->min, (s32)mpu0->rminn_intake_fan); |
332 | fan->max = min(fan->max, (s32)mpu0->rmaxn_intake_fan); |
333 | goto bail; |
334 | } |
335 | if (mpu1 && !strcmp(fan->ctrl.name, "cpu-front-fan-1" )) { |
336 | fan->min = max(fan->min, (s32)mpu1->rminn_intake_fan); |
337 | fan->max = min(fan->max, (s32)mpu1->rmaxn_intake_fan); |
338 | goto bail; |
339 | } |
340 | if (mpu0 && !strcmp(fan->ctrl.name, "cpu-rear-fan-0" )) { |
341 | fan->min = max(fan->min, (s32)mpu0->rminn_exhaust_fan); |
342 | fan->max = min(fan->max, (s32)mpu0->rmaxn_exhaust_fan); |
343 | goto bail; |
344 | } |
345 | if (mpu1 && !strcmp(fan->ctrl.name, "cpu-rear-fan-1" )) { |
346 | fan->min = max(fan->min, (s32)mpu1->rminn_exhaust_fan); |
347 | fan->max = min(fan->max, (s32)mpu1->rmaxn_exhaust_fan); |
348 | goto bail; |
349 | } |
350 | /* Rackmac variants, we just use mpu0 intake */ |
351 | if (!strncmp(fan->ctrl.name, "cpu-fan" , 7)) { |
352 | fan->min = max(fan->min, (s32)mpu0->rminn_intake_fan); |
353 | fan->max = min(fan->max, (s32)mpu0->rmaxn_intake_fan); |
354 | goto bail; |
355 | } |
356 | bail: |
357 | DBG("wf_fcu: fan min/max for %s set to: [%d..%d] RPM\n" , |
358 | fan->ctrl.name, fan->min, fan->max); |
359 | } |
360 | |
361 | static void wf_fcu_add_fan(struct wf_fcu_priv *pv, const char *name, |
362 | int type, int id) |
363 | { |
364 | struct wf_fcu_fan *fan; |
365 | |
366 | fan = kzalloc(size: sizeof(*fan), GFP_KERNEL); |
367 | if (!fan) |
368 | return; |
369 | fan->fcu_priv = pv; |
370 | fan->id = id; |
371 | fan->ctrl.name = name; |
372 | fan->ctrl.priv = fan; |
373 | |
374 | /* min/max is oddball but the code comes from |
375 | * therm_pm72 which seems to work so ... |
376 | */ |
377 | if (type == FCU_FAN_RPM) { |
378 | if (!strncmp(name, "cpu-pump" , strlen("cpu-pump" ))) |
379 | wf_fcu_get_pump_minmax(fan); |
380 | else |
381 | wf_fcu_get_rpmfan_minmax(fan); |
382 | fan->ctrl.type = WF_CONTROL_RPM_FAN; |
383 | fan->ctrl.ops = &wf_fcu_fan_rpm_ops; |
384 | } else { |
385 | fan->min = 10; |
386 | fan->max = 100; |
387 | fan->ctrl.type = WF_CONTROL_PWM_FAN; |
388 | fan->ctrl.ops = &wf_fcu_fan_pwm_ops; |
389 | } |
390 | |
391 | if (wf_register_control(ct: &fan->ctrl)) { |
392 | pr_err("wf_fcu: Failed to register fan %s\n" , name); |
393 | kfree(objp: fan); |
394 | return; |
395 | } |
396 | list_add(new: &fan->link, head: &pv->fan_list); |
397 | kref_get(kref: &pv->ref); |
398 | } |
399 | |
400 | static void wf_fcu_lookup_fans(struct wf_fcu_priv *pv) |
401 | { |
402 | /* Translation of device-tree location properties to |
403 | * windfarm fan names |
404 | */ |
405 | static const struct { |
406 | const char *dt_name; /* Device-tree name */ |
407 | const char *ct_name; /* Control name */ |
408 | } loc_trans[] = { |
409 | { "BACKSIDE" , "backside-fan" , }, |
410 | { "SYS CTRLR FAN" , "backside-fan" , }, |
411 | { "DRIVE BAY" , "drive-bay-fan" , }, |
412 | { "SLOT" , "slots-fan" , }, |
413 | { "PCI FAN" , "slots-fan" , }, |
414 | { "CPU A INTAKE" , "cpu-front-fan-0" , }, |
415 | { "CPU A EXHAUST" , "cpu-rear-fan-0" , }, |
416 | { "CPU B INTAKE" , "cpu-front-fan-1" , }, |
417 | { "CPU B EXHAUST" , "cpu-rear-fan-1" , }, |
418 | { "CPU A PUMP" , "cpu-pump-0" , }, |
419 | { "CPU B PUMP" , "cpu-pump-1" , }, |
420 | { "CPU A 1" , "cpu-fan-a-0" , }, |
421 | { "CPU A 2" , "cpu-fan-b-0" , }, |
422 | { "CPU A 3" , "cpu-fan-c-0" , }, |
423 | { "CPU B 1" , "cpu-fan-a-1" , }, |
424 | { "CPU B 2" , "cpu-fan-b-1" , }, |
425 | { "CPU B 3" , "cpu-fan-c-1" , }, |
426 | }; |
427 | struct device_node *np, *fcu = pv->i2c->dev.of_node; |
428 | int i; |
429 | |
430 | DBG("Looking up FCU controls in device-tree...\n" ); |
431 | |
432 | for_each_child_of_node(fcu, np) { |
433 | int id, type = -1; |
434 | const char *loc; |
435 | const char *name; |
436 | const u32 *reg; |
437 | |
438 | DBG(" control: %pOFn, type: %s\n" , np, of_node_get_device_type(np)); |
439 | |
440 | /* Detect control type */ |
441 | if (of_node_is_type(np, type: "fan-rpm-control" ) || |
442 | of_node_is_type(np, type: "fan-rpm" )) |
443 | type = FCU_FAN_RPM; |
444 | if (of_node_is_type(np, type: "fan-pwm-control" ) || |
445 | of_node_is_type(np, type: "fan-pwm" )) |
446 | type = FCU_FAN_PWM; |
447 | /* Only care about fans for now */ |
448 | if (type == -1) |
449 | continue; |
450 | |
451 | /* Lookup for a matching location */ |
452 | loc = of_get_property(node: np, name: "location" , NULL); |
453 | reg = of_get_property(node: np, name: "reg" , NULL); |
454 | if (loc == NULL || reg == NULL) |
455 | continue; |
456 | DBG(" matching location: %s, reg: 0x%08x\n" , loc, *reg); |
457 | |
458 | for (i = 0; i < ARRAY_SIZE(loc_trans); i++) { |
459 | if (strncmp(loc, loc_trans[i].dt_name, |
460 | strlen(loc_trans[i].dt_name))) |
461 | continue; |
462 | name = loc_trans[i].ct_name; |
463 | |
464 | DBG(" location match, name: %s\n" , name); |
465 | |
466 | if (type == FCU_FAN_RPM) |
467 | id = ((*reg) - 0x10) / 2; |
468 | else |
469 | id = ((*reg) - 0x30) / 2; |
470 | if (id > 7) { |
471 | pr_warn("wf_fcu: Can't parse fan ID in device-tree for %pOF\n" , np); |
472 | break; |
473 | } |
474 | wf_fcu_add_fan(pv, name, type, id); |
475 | break; |
476 | } |
477 | } |
478 | } |
479 | |
480 | static void wf_fcu_default_fans(struct wf_fcu_priv *pv) |
481 | { |
482 | /* We only support the default fans for PowerMac7,2 */ |
483 | if (!of_machine_is_compatible(compat: "PowerMac7,2" )) |
484 | return; |
485 | |
486 | wf_fcu_add_fan(pv, name: "backside-fan" , FCU_FAN_PWM, id: 1); |
487 | wf_fcu_add_fan(pv, name: "drive-bay-fan" , FCU_FAN_RPM, id: 2); |
488 | wf_fcu_add_fan(pv, name: "slots-fan" , FCU_FAN_PWM, id: 2); |
489 | wf_fcu_add_fan(pv, name: "cpu-front-fan-0" , FCU_FAN_RPM, id: 3); |
490 | wf_fcu_add_fan(pv, name: "cpu-rear-fan-0" , FCU_FAN_RPM, id: 4); |
491 | wf_fcu_add_fan(pv, name: "cpu-front-fan-1" , FCU_FAN_RPM, id: 5); |
492 | wf_fcu_add_fan(pv, name: "cpu-rear-fan-1" , FCU_FAN_RPM, id: 6); |
493 | } |
494 | |
495 | static int wf_fcu_init_chip(struct wf_fcu_priv *pv) |
496 | { |
497 | unsigned char buf = 0xff; |
498 | int rc; |
499 | |
500 | rc = wf_fcu_write_reg(pv, reg: 0xe, ptr: &buf, nb: 1); |
501 | if (rc < 0) |
502 | return -EIO; |
503 | rc = wf_fcu_write_reg(pv, reg: 0x2e, ptr: &buf, nb: 1); |
504 | if (rc < 0) |
505 | return -EIO; |
506 | rc = wf_fcu_read_reg(pv, reg: 0, buf: &buf, nb: 1); |
507 | if (rc < 0) |
508 | return -EIO; |
509 | pv->rpm_shift = (buf == 1) ? 2 : 3; |
510 | |
511 | pr_debug("wf_fcu: FCU Initialized, RPM fan shift is %d\n" , |
512 | pv->rpm_shift); |
513 | |
514 | return 0; |
515 | } |
516 | |
517 | static int wf_fcu_probe(struct i2c_client *client) |
518 | { |
519 | struct wf_fcu_priv *pv; |
520 | |
521 | pv = kzalloc(size: sizeof(*pv), GFP_KERNEL); |
522 | if (!pv) |
523 | return -ENOMEM; |
524 | |
525 | kref_init(kref: &pv->ref); |
526 | mutex_init(&pv->lock); |
527 | INIT_LIST_HEAD(list: &pv->fan_list); |
528 | pv->i2c = client; |
529 | |
530 | /* |
531 | * First we must start the FCU which will query the |
532 | * shift value to apply to RPMs |
533 | */ |
534 | if (wf_fcu_init_chip(pv)) { |
535 | pr_err("wf_fcu: Initialization failed !\n" ); |
536 | kfree(objp: pv); |
537 | return -ENXIO; |
538 | } |
539 | |
540 | /* First lookup fans in the device-tree */ |
541 | wf_fcu_lookup_fans(pv); |
542 | |
543 | /* |
544 | * Older machines don't have the device-tree entries |
545 | * we are looking for, just hard code the list |
546 | */ |
547 | if (list_empty(head: &pv->fan_list)) |
548 | wf_fcu_default_fans(pv); |
549 | |
550 | /* Still no fans ? FAIL */ |
551 | if (list_empty(head: &pv->fan_list)) { |
552 | pr_err("wf_fcu: Failed to find fans for your machine\n" ); |
553 | kfree(objp: pv); |
554 | return -ENODEV; |
555 | } |
556 | |
557 | dev_set_drvdata(dev: &client->dev, data: pv); |
558 | |
559 | return 0; |
560 | } |
561 | |
562 | static void wf_fcu_remove(struct i2c_client *client) |
563 | { |
564 | struct wf_fcu_priv *pv = dev_get_drvdata(dev: &client->dev); |
565 | struct wf_fcu_fan *fan; |
566 | |
567 | while (!list_empty(head: &pv->fan_list)) { |
568 | fan = list_first_entry(&pv->fan_list, struct wf_fcu_fan, link); |
569 | list_del(entry: &fan->link); |
570 | wf_unregister_control(ct: &fan->ctrl); |
571 | } |
572 | kref_put(kref: &pv->ref, release: wf_fcu_release); |
573 | } |
574 | |
575 | static const struct i2c_device_id wf_fcu_id[] = { |
576 | { "MAC,fcu" , 0 }, |
577 | { } |
578 | }; |
579 | MODULE_DEVICE_TABLE(i2c, wf_fcu_id); |
580 | |
581 | static const struct of_device_id wf_fcu_of_id[] = { |
582 | { .compatible = "fcu" , }, |
583 | { } |
584 | }; |
585 | MODULE_DEVICE_TABLE(of, wf_fcu_of_id); |
586 | |
587 | static struct i2c_driver wf_fcu_driver = { |
588 | .driver = { |
589 | .name = "wf_fcu" , |
590 | .of_match_table = wf_fcu_of_id, |
591 | }, |
592 | .probe = wf_fcu_probe, |
593 | .remove = wf_fcu_remove, |
594 | .id_table = wf_fcu_id, |
595 | }; |
596 | |
597 | module_i2c_driver(wf_fcu_driver); |
598 | |
599 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>" ); |
600 | MODULE_DESCRIPTION("FCU control objects for PowerMacs thermal control" ); |
601 | MODULE_LICENSE("GPL" ); |
602 | |
603 | |