Commit | Line | Data |
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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * Device driver for the i2c thermostat found on the iBook G4, Albook G4 | |
4 | * | |
5 | * Copyright (C) 2003, 2004 Colin Leroy, Rasmus Rohde, Benjamin Herrenschmidt | |
6 | * | |
631dd1a8 | 7 | * Documentation from 115254175ADT7467_pra.pdf and 3686221171167ADT7460_b.pdf |
1666e5ea AK |
8 | * https://www.onsemi.com/PowerSolutions/product.do?id=ADT7467 |
9 | * https://www.onsemi.com/PowerSolutions/product.do?id=ADT7460 | |
1da177e4 LT |
10 | * |
11 | */ | |
12 | ||
1da177e4 LT |
13 | #include <linux/types.h> |
14 | #include <linux/module.h> | |
15 | #include <linux/errno.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/sched.h> | |
19 | #include <linux/i2c.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/spinlock.h> | |
1da177e4 LT |
23 | #include <linux/wait.h> |
24 | #include <linux/suspend.h> | |
25 | #include <linux/kthread.h> | |
26 | #include <linux/moduleparam.h> | |
7dfb7103 | 27 | #include <linux/freezer.h> |
233d687d | 28 | #include <linux/of.h> |
ad9e05ae | 29 | #include <linux/of_platform.h> |
233d687d | 30 | #include <linux/platform_device.h> |
1da177e4 | 31 | |
1da177e4 LT |
32 | #include <asm/machdep.h> |
33 | #include <asm/io.h> | |
1da177e4 | 34 | #include <asm/sections.h> |
1da177e4 LT |
35 | |
36 | #undef DEBUG | |
37 | ||
38 | #define CONFIG_REG 0x40 | |
39 | #define MANUAL_MASK 0xe0 | |
40 | #define AUTO_MASK 0x20 | |
0512a9a8 | 41 | #define INVERT_MASK 0x10 |
1da177e4 | 42 | |
d20c507f CL |
43 | static u8 TEMP_REG[3] = {0x26, 0x25, 0x27}; /* local, sensor1, sensor2 */ |
44 | static u8 LIMIT_REG[3] = {0x6b, 0x6a, 0x6c}; /* local, sensor1, sensor2 */ | |
1da177e4 LT |
45 | static u8 MANUAL_MODE[2] = {0x5c, 0x5d}; |
46 | static u8 REM_CONTROL[2] = {0x00, 0x40}; | |
47 | static u8 FAN_SPEED[2] = {0x28, 0x2a}; | |
48 | static u8 FAN_SPD_SET[2] = {0x30, 0x31}; | |
49 | ||
d20c507f CL |
50 | static u8 default_limits_local[3] = {70, 50, 70}; /* local, sensor1, sensor2 */ |
51 | static u8 default_limits_chip[3] = {80, 65, 80}; /* local, sensor1, sensor2 */ | |
7a4b15cd | 52 | static const char *sensor_location[3] = { "?", "?", "?" }; |
1da177e4 | 53 | |
87275856 | 54 | static int limit_adjust; |
1da177e4 | 55 | static int fan_speed = -1; |
90ab5ee9 | 56 | static bool verbose; |
1da177e4 LT |
57 | |
58 | MODULE_AUTHOR("Colin Leroy <colin@colino.net>"); | |
59 | MODULE_DESCRIPTION("Driver for ADT746x thermostat in iBook G4 and " | |
60 | "Powerbook G4 Alu"); | |
61 | MODULE_LICENSE("GPL"); | |
62 | ||
63 | module_param(limit_adjust, int, 0644); | |
d20c507f | 64 | MODULE_PARM_DESC(limit_adjust,"Adjust maximum temperatures (50 sensor1, 70 sensor2) " |
1da177e4 LT |
65 | "by N degrees."); |
66 | ||
67 | module_param(fan_speed, int, 0644); | |
68 | MODULE_PARM_DESC(fan_speed,"Specify starting fan speed (0-255) " | |
69 | "(default 64)"); | |
70 | ||
9f6d4b0c BC |
71 | module_param(verbose, bool, 0); |
72 | MODULE_PARM_DESC(verbose,"Verbose log operations " | |
73 | "(default 0)"); | |
74 | ||
1da177e4 | 75 | struct thermostat { |
2e613e7f | 76 | struct i2c_client *clt; |
1da177e4 LT |
77 | u8 temps[3]; |
78 | u8 cached_temp[3]; | |
79 | u8 initial_limits[3]; | |
80 | u8 limits[3]; | |
81 | int last_speed[2]; | |
82 | int last_var[2]; | |
1496e89a | 83 | int pwm_inv[2]; |
7a4b15cd BH |
84 | struct task_struct *thread; |
85 | struct platform_device *pdev; | |
86 | enum { | |
87 | ADT7460, | |
88 | ADT7467 | |
89 | } type; | |
1da177e4 LT |
90 | }; |
91 | ||
1da177e4 LT |
92 | static void write_both_fan_speed(struct thermostat *th, int speed); |
93 | static void write_fan_speed(struct thermostat *th, int speed, int fan); | |
94 | ||
95 | static int | |
96 | write_reg(struct thermostat* th, int reg, u8 data) | |
97 | { | |
98 | u8 tmp[2]; | |
99 | int rc; | |
100 | ||
101 | tmp[0] = reg; | |
102 | tmp[1] = data; | |
2e613e7f | 103 | rc = i2c_master_send(th->clt, (const char *)tmp, 2); |
1da177e4 LT |
104 | if (rc < 0) |
105 | return rc; | |
106 | if (rc != 2) | |
107 | return -ENODEV; | |
108 | return 0; | |
109 | } | |
110 | ||
111 | static int | |
112 | read_reg(struct thermostat* th, int reg) | |
113 | { | |
114 | u8 reg_addr, data; | |
115 | int rc; | |
116 | ||
117 | reg_addr = (u8)reg; | |
2e613e7f | 118 | rc = i2c_master_send(th->clt, ®_addr, 1); |
1da177e4 LT |
119 | if (rc < 0) |
120 | return rc; | |
121 | if (rc != 1) | |
122 | return -ENODEV; | |
2e613e7f | 123 | rc = i2c_master_recv(th->clt, (char *)&data, 1); |
1da177e4 LT |
124 | if (rc < 0) |
125 | return rc; | |
126 | return data; | |
127 | } | |
128 | ||
1da177e4 LT |
129 | static int read_fan_speed(struct thermostat *th, u8 addr) |
130 | { | |
131 | u8 tmp[2]; | |
132 | u16 res; | |
133 | ||
134 | /* should start with low byte */ | |
135 | tmp[1] = read_reg(th, addr); | |
136 | tmp[0] = read_reg(th, addr + 1); | |
137 | ||
138 | res = tmp[1] + (tmp[0] << 8); | |
139 | /* "a value of 0xffff means that the fan has stopped" */ | |
140 | return (res == 0xffff ? 0 : (90000*60)/res); | |
141 | } | |
142 | ||
143 | static void write_both_fan_speed(struct thermostat *th, int speed) | |
144 | { | |
145 | write_fan_speed(th, speed, 0); | |
7a4b15cd | 146 | if (th->type == ADT7460) |
1da177e4 LT |
147 | write_fan_speed(th, speed, 1); |
148 | } | |
149 | ||
150 | static void write_fan_speed(struct thermostat *th, int speed, int fan) | |
151 | { | |
152 | u8 manual; | |
153 | ||
154 | if (speed > 0xff) | |
155 | speed = 0xff; | |
156 | else if (speed < -1) | |
157 | speed = 0; | |
158 | ||
7a4b15cd | 159 | if (th->type == ADT7467 && fan == 1) |
1da177e4 LT |
160 | return; |
161 | ||
162 | if (th->last_speed[fan] != speed) { | |
9f6d4b0c BC |
163 | if (verbose) { |
164 | if (speed == -1) | |
165 | printk(KERN_DEBUG "adt746x: Setting speed to automatic " | |
166 | "for %s fan.\n", sensor_location[fan+1]); | |
167 | else | |
168 | printk(KERN_DEBUG "adt746x: Setting speed to %d " | |
169 | "for %s fan.\n", speed, sensor_location[fan+1]); | |
170 | } | |
1da177e4 LT |
171 | } else |
172 | return; | |
173 | ||
174 | if (speed >= 0) { | |
175 | manual = read_reg(th, MANUAL_MODE[fan]); | |
1496e89a | 176 | manual &= ~INVERT_MASK; |
0512a9a8 | 177 | write_reg(th, MANUAL_MODE[fan], |
1496e89a | 178 | manual | MANUAL_MASK | th->pwm_inv[fan]); |
1da177e4 LT |
179 | write_reg(th, FAN_SPD_SET[fan], speed); |
180 | } else { | |
181 | /* back to automatic */ | |
7a4b15cd | 182 | if(th->type == ADT7460) { |
1da177e4 LT |
183 | manual = read_reg(th, |
184 | MANUAL_MODE[fan]) & (~MANUAL_MASK); | |
1496e89a DW |
185 | manual &= ~INVERT_MASK; |
186 | manual |= th->pwm_inv[fan]; | |
1da177e4 LT |
187 | write_reg(th, |
188 | MANUAL_MODE[fan], manual|REM_CONTROL[fan]); | |
189 | } else { | |
190 | manual = read_reg(th, MANUAL_MODE[fan]); | |
1496e89a DW |
191 | manual &= ~INVERT_MASK; |
192 | manual |= th->pwm_inv[fan]; | |
1da177e4 LT |
193 | write_reg(th, MANUAL_MODE[fan], manual&(~AUTO_MASK)); |
194 | } | |
195 | } | |
196 | ||
197 | th->last_speed[fan] = speed; | |
198 | } | |
199 | ||
200 | static void read_sensors(struct thermostat *th) | |
201 | { | |
202 | int i = 0; | |
203 | ||
204 | for (i = 0; i < 3; i++) | |
205 | th->temps[i] = read_reg(th, TEMP_REG[i]); | |
206 | } | |
207 | ||
208 | #ifdef DEBUG | |
209 | static void display_stats(struct thermostat *th) | |
210 | { | |
211 | if (th->temps[0] != th->cached_temp[0] | |
212 | || th->temps[1] != th->cached_temp[1] | |
213 | || th->temps[2] != th->cached_temp[2]) { | |
214 | printk(KERN_INFO "adt746x: Temperature infos:" | |
215 | " thermostats: %d,%d,%d;" | |
216 | " limits: %d,%d,%d;" | |
217 | " fan speed: %d RPM\n", | |
218 | th->temps[0], th->temps[1], th->temps[2], | |
219 | th->limits[0], th->limits[1], th->limits[2], | |
220 | read_fan_speed(th, FAN_SPEED[0])); | |
221 | } | |
222 | th->cached_temp[0] = th->temps[0]; | |
223 | th->cached_temp[1] = th->temps[1]; | |
224 | th->cached_temp[2] = th->temps[2]; | |
225 | } | |
226 | #endif | |
227 | ||
228 | static void update_fans_speed (struct thermostat *th) | |
229 | { | |
230 | int lastvar = 0; /* last variation, for iBook */ | |
231 | int i = 0; | |
232 | ||
233 | /* we don't care about local sensor, so we start at sensor 1 */ | |
234 | for (i = 1; i < 3; i++) { | |
4f256d56 | 235 | bool started = false; |
7a4b15cd | 236 | int fan_number = (th->type == ADT7460 && i == 2); |
1da177e4 LT |
237 | int var = th->temps[i] - th->limits[i]; |
238 | ||
239 | if (var > -1) { | |
240 | int step = (255 - fan_speed) / 7; | |
241 | int new_speed = 0; | |
242 | ||
243 | /* hysteresis : change fan speed only if variation is | |
244 | * more than two degrees */ | |
245 | if (abs(var - th->last_var[fan_number]) < 2) | |
246 | continue; | |
247 | ||
4f256d56 | 248 | started = true; |
1da177e4 LT |
249 | new_speed = fan_speed + ((var-1)*step); |
250 | ||
251 | if (new_speed < fan_speed) | |
252 | new_speed = fan_speed; | |
253 | if (new_speed > 255) | |
254 | new_speed = 255; | |
255 | ||
9f6d4b0c BC |
256 | if (verbose) |
257 | printk(KERN_DEBUG "adt746x: Setting fans speed to %d " | |
8354be9c | 258 | "(limit exceeded by %d on %s)\n", |
9f6d4b0c BC |
259 | new_speed, var, |
260 | sensor_location[fan_number+1]); | |
1da177e4 LT |
261 | write_both_fan_speed(th, new_speed); |
262 | th->last_var[fan_number] = var; | |
263 | } else if (var < -2) { | |
d20c507f | 264 | /* don't stop fan if sensor2 is cold and sensor1 is not |
1da177e4 LT |
265 | * so cold (lastvar >= -1) */ |
266 | if (i == 2 && lastvar < -1) { | |
267 | if (th->last_speed[fan_number] != 0) | |
9f6d4b0c BC |
268 | if (verbose) |
269 | printk(KERN_DEBUG "adt746x: Stopping " | |
270 | "fans.\n"); | |
1da177e4 LT |
271 | write_both_fan_speed(th, 0); |
272 | } | |
273 | } | |
274 | ||
275 | lastvar = var; | |
276 | ||
277 | if (started) | |
278 | return; /* we don't want to re-stop the fan | |
d20c507f | 279 | * if sensor1 is heating and sensor2 is not */ |
1da177e4 LT |
280 | } |
281 | } | |
282 | ||
283 | static int monitor_task(void *arg) | |
284 | { | |
285 | struct thermostat* th = arg; | |
286 | ||
83144186 | 287 | set_freezable(); |
1da177e4 | 288 | while(!kthread_should_stop()) { |
3e1d1d28 | 289 | try_to_freeze(); |
1da177e4 LT |
290 | msleep_interruptible(2000); |
291 | ||
292 | #ifndef DEBUG | |
293 | if (fan_speed != -1) | |
294 | read_sensors(th); | |
295 | #else | |
296 | read_sensors(th); | |
297 | #endif | |
298 | ||
299 | if (fan_speed != -1) | |
300 | update_fans_speed(th); | |
301 | ||
302 | #ifdef DEBUG | |
303 | display_stats(th); | |
304 | #endif | |
305 | ||
306 | } | |
307 | ||
308 | return 0; | |
309 | } | |
310 | ||
311 | static void set_limit(struct thermostat *th, int i) | |
312 | { | |
7a4b15cd BH |
313 | /* Set sensor1 limit higher to avoid powerdowns */ |
314 | th->limits[i] = default_limits_chip[i] + limit_adjust; | |
315 | write_reg(th, LIMIT_REG[i], th->limits[i]); | |
1da177e4 | 316 | |
7a4b15cd BH |
317 | /* set our limits to normal */ |
318 | th->limits[i] = default_limits_local[i] + limit_adjust; | |
1da177e4 LT |
319 | } |
320 | ||
7a4b15cd BH |
321 | #define BUILD_SHOW_FUNC_INT(name, data) \ |
322 | static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \ | |
323 | { \ | |
324 | struct thermostat *th = dev_get_drvdata(dev); \ | |
325 | return sprintf(buf, "%d\n", data); \ | |
1da177e4 LT |
326 | } |
327 | ||
7a4b15cd | 328 | #define BUILD_SHOW_FUNC_INT_LITE(name, data) \ |
e404e274 | 329 | static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
330 | { \ |
331 | return sprintf(buf, "%d\n", data); \ | |
332 | } | |
333 | ||
d20c507f | 334 | #define BUILD_SHOW_FUNC_STR(name, data) \ |
e404e274 | 335 | static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \ |
d20c507f CL |
336 | { \ |
337 | return sprintf(buf, "%s\n", data); \ | |
338 | } | |
339 | ||
1da177e4 | 340 | #define BUILD_SHOW_FUNC_FAN(name, data) \ |
e404e274 | 341 | static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 | 342 | { \ |
7a4b15cd | 343 | struct thermostat *th = dev_get_drvdata(dev); \ |
1da177e4 | 344 | return sprintf(buf, "%d (%d rpm)\n", \ |
7a4b15cd BH |
345 | th->last_speed[data], \ |
346 | read_fan_speed(th, FAN_SPEED[data]) \ | |
1da177e4 LT |
347 | ); \ |
348 | } | |
349 | ||
350 | #define BUILD_STORE_FUNC_DEG(name, data) \ | |
e404e274 | 351 | static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \ |
1da177e4 | 352 | { \ |
7a4b15cd | 353 | struct thermostat *th = dev_get_drvdata(dev); \ |
1da177e4 LT |
354 | int val; \ |
355 | int i; \ | |
356 | val = simple_strtol(buf, NULL, 10); \ | |
d20c507f | 357 | printk(KERN_INFO "Adjusting limits by %d degrees\n", val); \ |
1da177e4 LT |
358 | limit_adjust = val; \ |
359 | for (i=0; i < 3; i++) \ | |
7a4b15cd | 360 | set_limit(th, i); \ |
1da177e4 LT |
361 | return n; \ |
362 | } | |
363 | ||
364 | #define BUILD_STORE_FUNC_INT(name, data) \ | |
e404e274 | 365 | static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \ |
1da177e4 | 366 | { \ |
2e74778c | 367 | int val; \ |
368 | val = simple_strtol(buf, NULL, 10); \ | |
1da177e4 LT |
369 | if (val < 0 || val > 255) \ |
370 | return -EINVAL; \ | |
371 | printk(KERN_INFO "Setting specified fan speed to %d\n", val); \ | |
372 | data = val; \ | |
373 | return n; \ | |
374 | } | |
375 | ||
7a4b15cd BH |
376 | BUILD_SHOW_FUNC_INT(sensor1_temperature, (read_reg(th, TEMP_REG[1]))) |
377 | BUILD_SHOW_FUNC_INT(sensor2_temperature, (read_reg(th, TEMP_REG[2]))) | |
378 | BUILD_SHOW_FUNC_INT(sensor1_limit, th->limits[1]) | |
379 | BUILD_SHOW_FUNC_INT(sensor2_limit, th->limits[2]) | |
d20c507f CL |
380 | BUILD_SHOW_FUNC_STR(sensor1_location, sensor_location[1]) |
381 | BUILD_SHOW_FUNC_STR(sensor2_location, sensor_location[2]) | |
1da177e4 | 382 | |
7a4b15cd BH |
383 | BUILD_SHOW_FUNC_INT_LITE(specified_fan_speed, fan_speed) |
384 | BUILD_STORE_FUNC_INT(specified_fan_speed,fan_speed) | |
385 | ||
d20c507f CL |
386 | BUILD_SHOW_FUNC_FAN(sensor1_fan_speed, 0) |
387 | BUILD_SHOW_FUNC_FAN(sensor2_fan_speed, 1) | |
1da177e4 | 388 | |
7a4b15cd BH |
389 | BUILD_SHOW_FUNC_INT_LITE(limit_adjust, limit_adjust) |
390 | BUILD_STORE_FUNC_DEG(limit_adjust, th) | |
1da177e4 | 391 | |
d20c507f CL |
392 | static DEVICE_ATTR(sensor1_temperature, S_IRUGO, |
393 | show_sensor1_temperature,NULL); | |
394 | static DEVICE_ATTR(sensor2_temperature, S_IRUGO, | |
395 | show_sensor2_temperature,NULL); | |
396 | static DEVICE_ATTR(sensor1_limit, S_IRUGO, | |
397 | show_sensor1_limit, NULL); | |
398 | static DEVICE_ATTR(sensor2_limit, S_IRUGO, | |
399 | show_sensor2_limit, NULL); | |
400 | static DEVICE_ATTR(sensor1_location, S_IRUGO, | |
401 | show_sensor1_location, NULL); | |
402 | static DEVICE_ATTR(sensor2_location, S_IRUGO, | |
403 | show_sensor2_location, NULL); | |
1da177e4 LT |
404 | |
405 | static DEVICE_ATTR(specified_fan_speed, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH, | |
406 | show_specified_fan_speed,store_specified_fan_speed); | |
407 | ||
d20c507f CL |
408 | static DEVICE_ATTR(sensor1_fan_speed, S_IRUGO, |
409 | show_sensor1_fan_speed, NULL); | |
410 | static DEVICE_ATTR(sensor2_fan_speed, S_IRUGO, | |
411 | show_sensor2_fan_speed, NULL); | |
1da177e4 LT |
412 | |
413 | static DEVICE_ATTR(limit_adjust, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH, | |
414 | show_limit_adjust, store_limit_adjust); | |
415 | ||
7a4b15cd | 416 | static void thermostat_create_files(struct thermostat *th) |
1da177e4 | 417 | { |
7a4b15cd BH |
418 | struct device_node *np = th->clt->dev.of_node; |
419 | struct device *dev; | |
420 | int err; | |
44ea9c80 | 421 | |
7a4b15cd BH |
422 | /* To maintain ABI compatibility with userspace, create |
423 | * the old style platform driver and attach the attributes | |
424 | * to it here | |
425 | */ | |
426 | th->pdev = of_platform_device_create(np, "temperatures", NULL); | |
427 | if (!th->pdev) | |
428 | return; | |
429 | dev = &th->pdev->dev; | |
430 | dev_set_drvdata(dev, th); | |
431 | err = device_create_file(dev, &dev_attr_sensor1_temperature); | |
432 | err |= device_create_file(dev, &dev_attr_sensor2_temperature); | |
433 | err |= device_create_file(dev, &dev_attr_sensor1_limit); | |
434 | err |= device_create_file(dev, &dev_attr_sensor2_limit); | |
435 | err |= device_create_file(dev, &dev_attr_sensor1_location); | |
436 | err |= device_create_file(dev, &dev_attr_sensor2_location); | |
437 | err |= device_create_file(dev, &dev_attr_limit_adjust); | |
438 | err |= device_create_file(dev, &dev_attr_specified_fan_speed); | |
439 | err |= device_create_file(dev, &dev_attr_sensor1_fan_speed); | |
440 | if(th->type == ADT7460) | |
441 | err |= device_create_file(dev, &dev_attr_sensor2_fan_speed); | |
442 | if (err) | |
443 | printk(KERN_WARNING | |
444 | "Failed to create temperature attribute file(s).\n"); | |
445 | } | |
a8bacec0 | 446 | |
7a4b15cd BH |
447 | static void thermostat_remove_files(struct thermostat *th) |
448 | { | |
449 | struct device *dev; | |
1da177e4 | 450 | |
7a4b15cd BH |
451 | if (!th->pdev) |
452 | return; | |
453 | dev = &th->pdev->dev; | |
454 | device_remove_file(dev, &dev_attr_sensor1_temperature); | |
455 | device_remove_file(dev, &dev_attr_sensor2_temperature); | |
456 | device_remove_file(dev, &dev_attr_sensor1_limit); | |
457 | device_remove_file(dev, &dev_attr_sensor2_limit); | |
458 | device_remove_file(dev, &dev_attr_sensor1_location); | |
459 | device_remove_file(dev, &dev_attr_sensor2_location); | |
460 | device_remove_file(dev, &dev_attr_limit_adjust); | |
461 | device_remove_file(dev, &dev_attr_specified_fan_speed); | |
462 | device_remove_file(dev, &dev_attr_sensor1_fan_speed); | |
463 | if (th->type == ADT7460) | |
464 | device_remove_file(dev, &dev_attr_sensor2_fan_speed); | |
465 | of_device_unregister(th->pdev); | |
1da177e4 | 466 | |
7a4b15cd | 467 | } |
1da177e4 | 468 | |
0424113f | 469 | static int probe_thermostat(struct i2c_client *client) |
7a4b15cd | 470 | { |
0424113f | 471 | const struct i2c_device_id *id = i2c_client_get_device_id(client); |
7a4b15cd BH |
472 | struct device_node *np = client->dev.of_node; |
473 | struct thermostat* th; | |
474 | const __be32 *prop; | |
475 | int i, rc, vers, offset = 0; | |
1da177e4 | 476 | |
7a4b15cd BH |
477 | if (!np) |
478 | return -ENXIO; | |
479 | prop = of_get_property(np, "hwsensor-params-version", NULL); | |
480 | if (!prop) | |
481 | return -ENXIO; | |
482 | vers = be32_to_cpup(prop); | |
483 | printk(KERN_INFO "adt746x: version %d (%ssupported)\n", | |
484 | vers, vers == 1 ? "" : "un"); | |
485 | if (vers != 1) | |
486 | return -ENXIO; | |
1da177e4 | 487 | |
87b626a6 | 488 | if (of_property_present(np, "hwsensor-location")) { |
d20c507f | 489 | for (i = 0; i < 3; i++) { |
01b2726d | 490 | sensor_location[i] = of_get_property(np, |
d20c507f CL |
491 | "hwsensor-location", NULL) + offset; |
492 | ||
493 | if (sensor_location[i] == NULL) | |
494 | sensor_location[i] = ""; | |
495 | ||
496 | printk(KERN_INFO "sensor %d: %s\n", i, sensor_location[i]); | |
497 | offset += strlen(sensor_location[i]) + 1; | |
498 | } | |
d20c507f CL |
499 | } |
500 | ||
7a4b15cd BH |
501 | th = kzalloc(sizeof(struct thermostat), GFP_KERNEL); |
502 | if (!th) | |
503 | return -ENOMEM; | |
504 | ||
505 | i2c_set_clientdata(client, th); | |
506 | th->clt = client; | |
507 | th->type = id->driver_data; | |
44ea9c80 | 508 | |
7a4b15cd BH |
509 | rc = read_reg(th, CONFIG_REG); |
510 | if (rc < 0) { | |
511 | dev_err(&client->dev, "Thermostat failed to read config!\n"); | |
512 | kfree(th); | |
1da177e4 LT |
513 | return -ENODEV; |
514 | } | |
44ea9c80 | 515 | |
7a4b15cd BH |
516 | /* force manual control to start the fan quieter */ |
517 | if (fan_speed == -1) | |
518 | fan_speed = 64; | |
519 | ||
520 | if (th->type == ADT7460) { | |
521 | printk(KERN_INFO "adt746x: ADT7460 initializing\n"); | |
522 | /* The 7460 needs to be started explicitly */ | |
523 | write_reg(th, CONFIG_REG, 1); | |
524 | } else | |
525 | printk(KERN_INFO "adt746x: ADT7467 initializing\n"); | |
33a470f6 | 526 | |
7a4b15cd BH |
527 | for (i = 0; i < 3; i++) { |
528 | th->initial_limits[i] = read_reg(th, LIMIT_REG[i]); | |
529 | set_limit(th, i); | |
530 | } | |
531 | ||
532 | printk(KERN_INFO "adt746x: Lowering max temperatures from %d, %d, %d" | |
533 | " to %d, %d, %d\n", | |
534 | th->initial_limits[0], th->initial_limits[1], | |
535 | th->initial_limits[2], th->limits[0], th->limits[1], | |
536 | th->limits[2]); | |
537 | ||
538 | /* record invert bit status because fw can corrupt it after suspend */ | |
539 | th->pwm_inv[0] = read_reg(th, MANUAL_MODE[0]) & INVERT_MASK; | |
540 | th->pwm_inv[1] = read_reg(th, MANUAL_MODE[1]) & INVERT_MASK; | |
541 | ||
542 | /* be sure to really write fan speed the first time */ | |
543 | th->last_speed[0] = -2; | |
544 | th->last_speed[1] = -2; | |
545 | th->last_var[0] = -80; | |
546 | th->last_var[1] = -80; | |
547 | ||
548 | if (fan_speed != -1) { | |
549 | /* manual mode, stop fans */ | |
550 | write_both_fan_speed(th, 0); | |
551 | } else { | |
552 | /* automatic mode */ | |
553 | write_both_fan_speed(th, -1); | |
554 | } | |
555 | ||
556 | th->thread = kthread_run(monitor_task, th, "kfand"); | |
557 | if (th->thread == ERR_PTR(-ENOMEM)) { | |
558 | printk(KERN_INFO "adt746x: Kthread creation failed\n"); | |
559 | th->thread = NULL; | |
560 | return -ENOMEM; | |
561 | } | |
562 | ||
563 | thermostat_create_files(th); | |
564 | ||
565 | return 0; | |
33a470f6 JD |
566 | } |
567 | ||
ed5c2f5f | 568 | static void remove_thermostat(struct i2c_client *client) |
33a470f6 | 569 | { |
7a4b15cd BH |
570 | struct thermostat *th = i2c_get_clientdata(client); |
571 | int i; | |
572 | ||
573 | thermostat_remove_files(th); | |
33a470f6 | 574 | |
7a4b15cd BH |
575 | if (th->thread != NULL) |
576 | kthread_stop(th->thread); | |
577 | ||
578 | printk(KERN_INFO "adt746x: Putting max temperatures back from " | |
579 | "%d, %d, %d to %d, %d, %d\n", | |
580 | th->limits[0], th->limits[1], th->limits[2], | |
581 | th->initial_limits[0], th->initial_limits[1], | |
582 | th->initial_limits[2]); | |
583 | ||
584 | for (i = 0; i < 3; i++) | |
585 | write_reg(th, LIMIT_REG[i], th->initial_limits[i]); | |
586 | ||
587 | write_both_fan_speed(th, -1); | |
588 | ||
589 | kfree(th); | |
1da177e4 LT |
590 | } |
591 | ||
7a4b15cd BH |
592 | static const struct i2c_device_id therm_adt746x_id[] = { |
593 | { "MAC,adt7460", ADT7460 }, | |
594 | { "MAC,adt7467", ADT7467 }, | |
595 | { } | |
596 | }; | |
597 | MODULE_DEVICE_TABLE(i2c, therm_adt746x_id); | |
598 | ||
599 | static struct i2c_driver thermostat_driver = { | |
600 | .driver = { | |
601 | .name = "therm_adt746x", | |
602 | }, | |
922db7c5 | 603 | .probe = probe_thermostat, |
7a4b15cd BH |
604 | .remove = remove_thermostat, |
605 | .id_table = therm_adt746x_id, | |
606 | }; | |
607 | ||
608 | static int __init thermostat_init(void) | |
1da177e4 | 609 | { |
7a4b15cd BH |
610 | #ifndef CONFIG_I2C_POWERMAC |
611 | request_module("i2c-powermac"); | |
612 | #endif | |
1da177e4 | 613 | |
7a4b15cd | 614 | return i2c_add_driver(&thermostat_driver); |
33a470f6 JD |
615 | } |
616 | ||
7a4b15cd | 617 | static void __exit thermostat_exit(void) |
33a470f6 | 618 | { |
1da177e4 LT |
619 | i2c_del_driver(&thermostat_driver); |
620 | } | |
621 | ||
622 | module_init(thermostat_init); | |
623 | module_exit(thermostat_exit); |