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2c162f9b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
a78a4a03 BH |
2 | /* |
3 | * Windfarm PowerMac thermal control. FCU fan control | |
4 | * | |
5 | * Copyright 2012 Benjamin Herrenschmidt, IBM Corp. | |
a78a4a03 BH |
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 | #include <asm/prom.h> | |
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 | * | |
6cd32099 BH |
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. | |
a78a4a03 | 45 | */ |
6cd32099 | 46 | #define RPM_PID_USE_ACTUAL_SPEED 0 |
a78a4a03 BH |
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(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(&fan->fcu_priv->ref, wf_fcu_release); | |
83 | kfree(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(pv->i2c, buf, 1); | |
97 | if (nw > 0 || (nw < 0 && nw != -EIO) || tries >= 100) | |
98 | break; | |
99 | msleep(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(pv->i2c, buf, nb); | |
110 | if (nr > 0 || (nr < 0 && nr != -ENODEV) || tries >= 100) | |
111 | break; | |
112 | msleep(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(&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(pv->i2c, buf, nb); | |
134 | if (nw > 0 || (nw < 0 && nw != -EIO) || tries >= 100) | |
135 | break; | |
136 | msleep(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 | ||
a78a4a03 BH |
156 | fan->target = value; |
157 | ||
158 | buf[0] = value >> (8 - shift); | |
159 | buf[1] = value << shift; | |
160 | rc = wf_fcu_write_reg(pv, 0x10 + (fan->id * 2), buf, 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, 0xb, &failure, 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, 0xd, &active, 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_base + (fan->id * 2), buf, 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 | ||
a78a4a03 BH |
213 | fan->target = value; |
214 | ||
215 | value = (value * 2559) / 1000; | |
216 | buf[0] = value; | |
217 | rc = wf_fcu_write_reg(pv, 0x30 + (fan->id * 2), buf, 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, 0x2b, &failure, 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, 0x2d, &active, 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, 0x30 + (fan->id * 2), buf, 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 | ||
1da42fb6 | 284 | static void wf_fcu_get_pump_minmax(struct wf_fcu_fan *fan) |
a78a4a03 BH |
285 | { |
286 | const struct mpu_data *mpu = wf_get_mpu(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 | ||
1da42fb6 | 319 | static void wf_fcu_get_rpmfan_minmax(struct wf_fcu_fan *fan) |
a78a4a03 BH |
320 | { |
321 | struct wf_fcu_priv *pv = fan->fcu_priv; | |
322 | const struct mpu_data *mpu0 = wf_get_mpu(0); | |
323 | const struct mpu_data *mpu1 = wf_get_mpu(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 | ||
1da42fb6 GKH |
361 | static void wf_fcu_add_fan(struct wf_fcu_priv *pv, const char *name, |
362 | int type, int id) | |
a78a4a03 BH |
363 | { |
364 | struct wf_fcu_fan *fan; | |
365 | ||
366 | fan = kzalloc(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(&fan->ctrl)) { | |
392 | pr_err("wf_fcu: Failed to register fan %s\n", name); | |
393 | kfree(fan); | |
394 | return; | |
395 | } | |
396 | list_add(&fan->link, &pv->fan_list); | |
397 | kref_get(&pv->ref); | |
398 | } | |
399 | ||
1da42fb6 | 400 | static void wf_fcu_lookup_fans(struct wf_fcu_priv *pv) |
a78a4a03 BH |
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 | }; | |
15b680c4 | 427 | struct device_node *np, *fcu = pv->i2c->dev.of_node; |
a78a4a03 BH |
428 | int i; |
429 | ||
430 | DBG("Looking up FCU controls in device-tree...\n"); | |
431 | ||
15b680c4 | 432 | for_each_child_of_node(fcu, np) { |
a78a4a03 BH |
433 | int id, type = -1; |
434 | const char *loc; | |
435 | const char *name; | |
436 | const u32 *reg; | |
437 | ||
15b680c4 | 438 | DBG(" control: %pOFn, type: %s\n", np, of_node_get_device_type(np)); |
a78a4a03 BH |
439 | |
440 | /* Detect control type */ | |
bf82d375 RH |
441 | if (of_node_is_type(np, "fan-rpm-control") || |
442 | of_node_is_type(np, "fan-rpm")) | |
a78a4a03 | 443 | type = FCU_FAN_RPM; |
bf82d375 RH |
444 | if (of_node_is_type(np, "fan-pwm-control") || |
445 | of_node_is_type(np, "fan-pwm")) | |
a78a4a03 BH |
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(np, "location", NULL); | |
453 | reg = of_get_property(np, "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_warning("wf_fcu: Can't parse " | |
b6a945ae RH |
472 | "fan ID in device-tree for %pOF\n", |
473 | np); | |
a78a4a03 BH |
474 | break; |
475 | } | |
476 | wf_fcu_add_fan(pv, name, type, id); | |
477 | break; | |
478 | } | |
479 | } | |
480 | } | |
481 | ||
1da42fb6 | 482 | static void wf_fcu_default_fans(struct wf_fcu_priv *pv) |
a78a4a03 BH |
483 | { |
484 | /* We only support the default fans for PowerMac7,2 */ | |
485 | if (!of_machine_is_compatible("PowerMac7,2")) | |
486 | return; | |
487 | ||
488 | wf_fcu_add_fan(pv, "backside-fan", FCU_FAN_PWM, 1); | |
489 | wf_fcu_add_fan(pv, "drive-bay-fan", FCU_FAN_RPM, 2); | |
490 | wf_fcu_add_fan(pv, "slots-fan", FCU_FAN_PWM, 2); | |
491 | wf_fcu_add_fan(pv, "cpu-front-fan-0", FCU_FAN_RPM, 3); | |
492 | wf_fcu_add_fan(pv, "cpu-rear-fan-0", FCU_FAN_RPM, 4); | |
493 | wf_fcu_add_fan(pv, "cpu-front-fan-1", FCU_FAN_RPM, 5); | |
494 | wf_fcu_add_fan(pv, "cpu-rear-fan-1", FCU_FAN_RPM, 6); | |
495 | } | |
496 | ||
1da42fb6 | 497 | static int wf_fcu_init_chip(struct wf_fcu_priv *pv) |
a78a4a03 BH |
498 | { |
499 | unsigned char buf = 0xff; | |
500 | int rc; | |
501 | ||
502 | rc = wf_fcu_write_reg(pv, 0xe, &buf, 1); | |
503 | if (rc < 0) | |
504 | return -EIO; | |
505 | rc = wf_fcu_write_reg(pv, 0x2e, &buf, 1); | |
506 | if (rc < 0) | |
507 | return -EIO; | |
508 | rc = wf_fcu_read_reg(pv, 0, &buf, 1); | |
509 | if (rc < 0) | |
510 | return -EIO; | |
511 | pv->rpm_shift = (buf == 1) ? 2 : 3; | |
512 | ||
513 | pr_debug("wf_fcu: FCU Initialized, RPM fan shift is %d\n", | |
514 | pv->rpm_shift); | |
515 | ||
516 | return 0; | |
517 | } | |
518 | ||
1da42fb6 GKH |
519 | static int wf_fcu_probe(struct i2c_client *client, |
520 | const struct i2c_device_id *id) | |
a78a4a03 BH |
521 | { |
522 | struct wf_fcu_priv *pv; | |
523 | ||
524 | pv = kzalloc(sizeof(*pv), GFP_KERNEL); | |
525 | if (!pv) | |
526 | return -ENOMEM; | |
527 | ||
528 | kref_init(&pv->ref); | |
529 | mutex_init(&pv->lock); | |
530 | INIT_LIST_HEAD(&pv->fan_list); | |
531 | pv->i2c = client; | |
532 | ||
533 | /* | |
534 | * First we must start the FCU which will query the | |
535 | * shift value to apply to RPMs | |
536 | */ | |
537 | if (wf_fcu_init_chip(pv)) { | |
538 | pr_err("wf_fcu: Initialization failed !\n"); | |
539 | kfree(pv); | |
540 | return -ENXIO; | |
541 | } | |
542 | ||
543 | /* First lookup fans in the device-tree */ | |
544 | wf_fcu_lookup_fans(pv); | |
545 | ||
546 | /* | |
547 | * Older machines don't have the device-tree entries | |
548 | * we are looking for, just hard code the list | |
549 | */ | |
550 | if (list_empty(&pv->fan_list)) | |
551 | wf_fcu_default_fans(pv); | |
552 | ||
553 | /* Still no fans ? FAIL */ | |
554 | if (list_empty(&pv->fan_list)) { | |
555 | pr_err("wf_fcu: Failed to find fans for your machine\n"); | |
556 | kfree(pv); | |
557 | return -ENODEV; | |
558 | } | |
559 | ||
560 | dev_set_drvdata(&client->dev, pv); | |
561 | ||
562 | return 0; | |
563 | } | |
564 | ||
1da42fb6 | 565 | static int wf_fcu_remove(struct i2c_client *client) |
a78a4a03 BH |
566 | { |
567 | struct wf_fcu_priv *pv = dev_get_drvdata(&client->dev); | |
568 | struct wf_fcu_fan *fan; | |
569 | ||
570 | while (!list_empty(&pv->fan_list)) { | |
571 | fan = list_first_entry(&pv->fan_list, struct wf_fcu_fan, link); | |
572 | list_del(&fan->link); | |
573 | wf_unregister_control(&fan->ctrl); | |
574 | } | |
575 | kref_put(&pv->ref, wf_fcu_release); | |
576 | return 0; | |
577 | } | |
578 | ||
579 | static const struct i2c_device_id wf_fcu_id[] = { | |
580 | { "MAC,fcu", 0 }, | |
581 | { } | |
582 | }; | |
583 | MODULE_DEVICE_TABLE(i2c, wf_fcu_id); | |
584 | ||
585 | static struct i2c_driver wf_fcu_driver = { | |
586 | .driver = { | |
587 | .name = "wf_fcu", | |
588 | }, | |
589 | .probe = wf_fcu_probe, | |
590 | .remove = wf_fcu_remove, | |
591 | .id_table = wf_fcu_id, | |
592 | }; | |
593 | ||
f7fb862b | 594 | module_i2c_driver(wf_fcu_driver); |
a78a4a03 BH |
595 | |
596 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); | |
597 | MODULE_DESCRIPTION("FCU control objects for PowerMacs thermal control"); | |
598 | MODULE_LICENSE("GPL"); | |
599 |