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1 | /* |
2 | * Copyright (C) ST-Ericsson 2010 - 2013 | |
3 | * Author: Martin Persson <martin.persson@stericsson.com> | |
4 | * Hongbo Zhang <hongbo.zhang@linaro.org> | |
5 | * License Terms: GNU General Public License v2 | |
6 | * | |
7 | * ABX500 does not provide auto ADC, so to monitor the required temperatures, | |
8 | * a periodic work is used. It is more important to not wake up the CPU than | |
9 | * to perform this job, hence the use of a deferred delay. | |
10 | * | |
11 | * A deferred delay for thermal monitor is considered safe because: | |
12 | * If the chip gets too hot during a sleep state it's most likely due to | |
13 | * external factors, such as the surrounding temperature. I.e. no SW decisions | |
14 | * will make any difference. | |
15 | */ | |
16 | ||
17 | #include <linux/err.h> | |
18 | #include <linux/hwmon.h> | |
19 | #include <linux/hwmon-sysfs.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/jiffies.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/mutex.h> | |
24 | #include <linux/of.h> | |
25 | #include <linux/platform_device.h> | |
26 | #include <linux/pm.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/sysfs.h> | |
29 | #include <linux/workqueue.h> | |
30 | #include "abx500.h" | |
31 | ||
32 | #define DEFAULT_MONITOR_DELAY HZ | |
33 | #define DEFAULT_MAX_TEMP 130 | |
34 | ||
35 | static inline void schedule_monitor(struct abx500_temp *data) | |
36 | { | |
37 | data->work_active = true; | |
38 | schedule_delayed_work(&data->work, DEFAULT_MONITOR_DELAY); | |
39 | } | |
40 | ||
41 | static void threshold_updated(struct abx500_temp *data) | |
42 | { | |
43 | int i; | |
44 | for (i = 0; i < data->monitored_sensors; i++) | |
45 | if (data->max[i] != 0 || data->min[i] != 0) { | |
46 | schedule_monitor(data); | |
47 | return; | |
48 | } | |
49 | ||
50 | dev_dbg(&data->pdev->dev, "No active thresholds.\n"); | |
51 | cancel_delayed_work_sync(&data->work); | |
52 | data->work_active = false; | |
53 | } | |
54 | ||
55 | static void gpadc_monitor(struct work_struct *work) | |
56 | { | |
57 | int temp, i, ret; | |
58 | char alarm_node[30]; | |
59 | bool updated_min_alarm, updated_max_alarm; | |
60 | struct abx500_temp *data; | |
61 | ||
62 | data = container_of(work, struct abx500_temp, work.work); | |
63 | mutex_lock(&data->lock); | |
64 | ||
65 | for (i = 0; i < data->monitored_sensors; i++) { | |
66 | /* Thresholds are considered inactive if set to 0 */ | |
67 | if (data->max[i] == 0 && data->min[i] == 0) | |
68 | continue; | |
69 | ||
70 | if (data->max[i] < data->min[i]) | |
71 | continue; | |
72 | ||
73 | ret = data->ops.read_sensor(data, data->gpadc_addr[i], &temp); | |
74 | if (ret < 0) { | |
75 | dev_err(&data->pdev->dev, "GPADC read failed\n"); | |
76 | continue; | |
77 | } | |
78 | ||
79 | updated_min_alarm = false; | |
80 | updated_max_alarm = false; | |
81 | ||
82 | if (data->min[i] != 0) { | |
83 | if (temp < data->min[i]) { | |
84 | if (data->min_alarm[i] == false) { | |
85 | data->min_alarm[i] = true; | |
86 | updated_min_alarm = true; | |
87 | } | |
88 | } else { | |
89 | if (data->min_alarm[i] == true) { | |
90 | data->min_alarm[i] = false; | |
91 | updated_min_alarm = true; | |
92 | } | |
93 | } | |
94 | } | |
95 | if (data->max[i] != 0) { | |
96 | if (temp > data->max[i]) { | |
97 | if (data->max_alarm[i] == false) { | |
98 | data->max_alarm[i] = true; | |
99 | updated_max_alarm = true; | |
100 | } | |
101 | } else if (temp < data->max[i] - data->max_hyst[i]) { | |
102 | if (data->max_alarm[i] == true) { | |
103 | data->max_alarm[i] = false; | |
104 | updated_max_alarm = true; | |
105 | } | |
106 | } | |
107 | } | |
108 | ||
109 | if (updated_min_alarm) { | |
110 | ret = sprintf(alarm_node, "temp%d_min_alarm", i + 1); | |
111 | sysfs_notify(&data->pdev->dev.kobj, NULL, alarm_node); | |
112 | } | |
113 | if (updated_max_alarm) { | |
114 | ret = sprintf(alarm_node, "temp%d_max_alarm", i + 1); | |
115 | sysfs_notify(&data->pdev->dev.kobj, NULL, alarm_node); | |
116 | } | |
117 | } | |
118 | ||
119 | schedule_monitor(data); | |
120 | mutex_unlock(&data->lock); | |
121 | } | |
122 | ||
123 | /* HWMON sysfs interfaces */ | |
124 | static ssize_t show_name(struct device *dev, struct device_attribute *devattr, | |
125 | char *buf) | |
126 | { | |
127 | struct abx500_temp *data = dev_get_drvdata(dev); | |
128 | /* Show chip name */ | |
129 | return data->ops.show_name(dev, devattr, buf); | |
130 | } | |
131 | ||
132 | static ssize_t show_label(struct device *dev, | |
133 | struct device_attribute *devattr, char *buf) | |
134 | { | |
135 | struct abx500_temp *data = dev_get_drvdata(dev); | |
136 | /* Show each sensor label */ | |
137 | return data->ops.show_label(dev, devattr, buf); | |
138 | } | |
139 | ||
140 | static ssize_t show_input(struct device *dev, | |
141 | struct device_attribute *devattr, char *buf) | |
142 | { | |
143 | int ret, temp; | |
144 | struct abx500_temp *data = dev_get_drvdata(dev); | |
145 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
146 | u8 gpadc_addr = data->gpadc_addr[attr->index]; | |
147 | ||
148 | ret = data->ops.read_sensor(data, gpadc_addr, &temp); | |
149 | if (ret < 0) | |
150 | return ret; | |
151 | ||
152 | return sprintf(buf, "%d\n", temp); | |
153 | } | |
154 | ||
155 | /* Set functions (RW nodes) */ | |
156 | static ssize_t set_min(struct device *dev, struct device_attribute *devattr, | |
157 | const char *buf, size_t count) | |
158 | { | |
159 | unsigned long val; | |
160 | struct abx500_temp *data = dev_get_drvdata(dev); | |
161 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
162 | int res = kstrtol(buf, 10, &val); | |
163 | if (res < 0) | |
164 | return res; | |
165 | ||
166 | val = clamp_val(val, 0, DEFAULT_MAX_TEMP); | |
167 | ||
168 | mutex_lock(&data->lock); | |
169 | data->min[attr->index] = val; | |
170 | threshold_updated(data); | |
171 | mutex_unlock(&data->lock); | |
172 | ||
173 | return count; | |
174 | } | |
175 | ||
176 | static ssize_t set_max(struct device *dev, struct device_attribute *devattr, | |
177 | const char *buf, size_t count) | |
178 | { | |
179 | unsigned long val; | |
180 | struct abx500_temp *data = dev_get_drvdata(dev); | |
181 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
182 | int res = kstrtol(buf, 10, &val); | |
183 | if (res < 0) | |
184 | return res; | |
185 | ||
186 | val = clamp_val(val, 0, DEFAULT_MAX_TEMP); | |
187 | ||
188 | mutex_lock(&data->lock); | |
189 | data->max[attr->index] = val; | |
190 | threshold_updated(data); | |
191 | mutex_unlock(&data->lock); | |
192 | ||
193 | return count; | |
194 | } | |
195 | ||
196 | static ssize_t set_max_hyst(struct device *dev, | |
197 | struct device_attribute *devattr, | |
198 | const char *buf, size_t count) | |
199 | { | |
200 | unsigned long val; | |
201 | struct abx500_temp *data = dev_get_drvdata(dev); | |
202 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
203 | int res = kstrtoul(buf, 10, &val); | |
204 | if (res < 0) | |
205 | return res; | |
206 | ||
207 | val = clamp_val(val, 0, DEFAULT_MAX_TEMP); | |
208 | ||
209 | mutex_lock(&data->lock); | |
210 | data->max_hyst[attr->index] = val; | |
211 | threshold_updated(data); | |
212 | mutex_unlock(&data->lock); | |
213 | ||
214 | return count; | |
215 | } | |
216 | ||
217 | /* Show functions (RO nodes) */ | |
218 | static ssize_t show_min(struct device *dev, | |
219 | struct device_attribute *devattr, char *buf) | |
220 | { | |
221 | struct abx500_temp *data = dev_get_drvdata(dev); | |
222 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
223 | ||
224 | return sprintf(buf, "%ld\n", data->min[attr->index]); | |
225 | } | |
226 | ||
227 | static ssize_t show_max(struct device *dev, | |
228 | struct device_attribute *devattr, char *buf) | |
229 | { | |
230 | struct abx500_temp *data = dev_get_drvdata(dev); | |
231 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
232 | ||
233 | return sprintf(buf, "%ld\n", data->max[attr->index]); | |
234 | } | |
235 | ||
236 | static ssize_t show_max_hyst(struct device *dev, | |
237 | struct device_attribute *devattr, char *buf) | |
238 | { | |
239 | struct abx500_temp *data = dev_get_drvdata(dev); | |
240 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
241 | ||
242 | return sprintf(buf, "%ld\n", data->max_hyst[attr->index]); | |
243 | } | |
244 | ||
245 | static ssize_t show_min_alarm(struct device *dev, | |
246 | struct device_attribute *devattr, char *buf) | |
247 | { | |
248 | struct abx500_temp *data = dev_get_drvdata(dev); | |
249 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
250 | ||
251 | return sprintf(buf, "%d\n", data->min_alarm[attr->index]); | |
252 | } | |
253 | ||
254 | static ssize_t show_max_alarm(struct device *dev, | |
255 | struct device_attribute *devattr, char *buf) | |
256 | { | |
257 | struct abx500_temp *data = dev_get_drvdata(dev); | |
258 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
259 | ||
260 | return sprintf(buf, "%d\n", data->max_alarm[attr->index]); | |
261 | } | |
262 | ||
60b7bf4e | 263 | static umode_t abx500_attrs_visible(struct kobject *kobj, |
0bbb06ed HZ |
264 | struct attribute *attr, int n) |
265 | { | |
266 | struct device *dev = container_of(kobj, struct device, kobj); | |
267 | struct abx500_temp *data = dev_get_drvdata(dev); | |
268 | ||
269 | if (data->ops.is_visible) | |
270 | return data->ops.is_visible(attr, n); | |
271 | ||
272 | return attr->mode; | |
273 | } | |
274 | ||
275 | /* Chip name, required by hwmon */ | |
276 | static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0); | |
277 | ||
278 | /* GPADC - SENSOR1 */ | |
279 | static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL, 0); | |
280 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0); | |
281 | static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_min, set_min, 0); | |
282 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_max, set_max, 0); | |
283 | static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, | |
284 | show_max_hyst, set_max_hyst, 0); | |
285 | static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_min_alarm, NULL, 0); | |
286 | static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_max_alarm, NULL, 0); | |
287 | ||
288 | /* GPADC - SENSOR2 */ | |
289 | static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL, 1); | |
290 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 1); | |
291 | static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_min, set_min, 1); | |
292 | static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_max, set_max, 1); | |
293 | static SENSOR_DEVICE_ATTR(temp2_max_hyst, S_IWUSR | S_IRUGO, | |
294 | show_max_hyst, set_max_hyst, 1); | |
295 | static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_min_alarm, NULL, 1); | |
296 | static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_max_alarm, NULL, 1); | |
297 | ||
298 | /* GPADC - SENSOR3 */ | |
299 | static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, show_label, NULL, 2); | |
300 | static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_input, NULL, 2); | |
301 | static SENSOR_DEVICE_ATTR(temp3_min, S_IWUSR | S_IRUGO, show_min, set_min, 2); | |
302 | static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_max, set_max, 2); | |
303 | static SENSOR_DEVICE_ATTR(temp3_max_hyst, S_IWUSR | S_IRUGO, | |
304 | show_max_hyst, set_max_hyst, 2); | |
305 | static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_min_alarm, NULL, 2); | |
306 | static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_max_alarm, NULL, 2); | |
307 | ||
308 | /* GPADC - SENSOR4 */ | |
309 | static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, show_label, NULL, 3); | |
310 | static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_input, NULL, 3); | |
311 | static SENSOR_DEVICE_ATTR(temp4_min, S_IWUSR | S_IRUGO, show_min, set_min, 3); | |
312 | static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR | S_IRUGO, show_max, set_max, 3); | |
313 | static SENSOR_DEVICE_ATTR(temp4_max_hyst, S_IWUSR | S_IRUGO, | |
314 | show_max_hyst, set_max_hyst, 3); | |
315 | static SENSOR_DEVICE_ATTR(temp4_min_alarm, S_IRUGO, show_min_alarm, NULL, 3); | |
316 | static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_max_alarm, NULL, 3); | |
317 | ||
0b905d83 | 318 | static struct attribute *abx500_temp_attributes[] = { |
0bbb06ed HZ |
319 | &sensor_dev_attr_name.dev_attr.attr, |
320 | ||
321 | &sensor_dev_attr_temp1_label.dev_attr.attr, | |
322 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
323 | &sensor_dev_attr_temp1_min.dev_attr.attr, | |
324 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
325 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, | |
326 | &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, | |
327 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, | |
328 | ||
329 | &sensor_dev_attr_temp2_label.dev_attr.attr, | |
330 | &sensor_dev_attr_temp2_input.dev_attr.attr, | |
331 | &sensor_dev_attr_temp2_min.dev_attr.attr, | |
332 | &sensor_dev_attr_temp2_max.dev_attr.attr, | |
333 | &sensor_dev_attr_temp2_max_hyst.dev_attr.attr, | |
334 | &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, | |
335 | &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, | |
336 | ||
337 | &sensor_dev_attr_temp3_label.dev_attr.attr, | |
338 | &sensor_dev_attr_temp3_input.dev_attr.attr, | |
339 | &sensor_dev_attr_temp3_min.dev_attr.attr, | |
340 | &sensor_dev_attr_temp3_max.dev_attr.attr, | |
341 | &sensor_dev_attr_temp3_max_hyst.dev_attr.attr, | |
342 | &sensor_dev_attr_temp3_min_alarm.dev_attr.attr, | |
343 | &sensor_dev_attr_temp3_max_alarm.dev_attr.attr, | |
344 | ||
345 | &sensor_dev_attr_temp4_label.dev_attr.attr, | |
346 | &sensor_dev_attr_temp4_input.dev_attr.attr, | |
347 | &sensor_dev_attr_temp4_min.dev_attr.attr, | |
348 | &sensor_dev_attr_temp4_max.dev_attr.attr, | |
349 | &sensor_dev_attr_temp4_max_hyst.dev_attr.attr, | |
350 | &sensor_dev_attr_temp4_min_alarm.dev_attr.attr, | |
351 | &sensor_dev_attr_temp4_max_alarm.dev_attr.attr, | |
352 | NULL | |
353 | }; | |
354 | ||
355 | static const struct attribute_group abx500_temp_group = { | |
356 | .attrs = abx500_temp_attributes, | |
357 | .is_visible = abx500_attrs_visible, | |
358 | }; | |
359 | ||
360 | static irqreturn_t abx500_temp_irq_handler(int irq, void *irq_data) | |
361 | { | |
362 | struct platform_device *pdev = irq_data; | |
363 | struct abx500_temp *data = platform_get_drvdata(pdev); | |
364 | ||
365 | data->ops.irq_handler(irq, data); | |
366 | return IRQ_HANDLED; | |
367 | } | |
368 | ||
369 | static int setup_irqs(struct platform_device *pdev) | |
370 | { | |
371 | int ret; | |
372 | int irq = platform_get_irq_byname(pdev, "ABX500_TEMP_WARM"); | |
373 | ||
374 | if (irq < 0) { | |
375 | dev_err(&pdev->dev, "Get irq by name failed\n"); | |
376 | return irq; | |
377 | } | |
378 | ||
379 | ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, | |
380 | abx500_temp_irq_handler, IRQF_NO_SUSPEND, "abx500-temp", pdev); | |
381 | if (ret < 0) | |
382 | dev_err(&pdev->dev, "Request threaded irq failed (%d)\n", ret); | |
383 | ||
384 | return ret; | |
385 | } | |
386 | ||
387 | static int abx500_temp_probe(struct platform_device *pdev) | |
388 | { | |
389 | struct abx500_temp *data; | |
390 | int err; | |
391 | ||
392 | data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); | |
393 | if (!data) | |
394 | return -ENOMEM; | |
395 | ||
396 | data->pdev = pdev; | |
397 | mutex_init(&data->lock); | |
398 | ||
399 | /* Chip specific initialization */ | |
400 | err = abx500_hwmon_init(data); | |
401 | if (err < 0 || !data->ops.read_sensor || !data->ops.show_name || | |
402 | !data->ops.show_label) | |
403 | return err; | |
404 | ||
405 | INIT_DEFERRABLE_WORK(&data->work, gpadc_monitor); | |
406 | ||
407 | platform_set_drvdata(pdev, data); | |
408 | ||
409 | err = sysfs_create_group(&pdev->dev.kobj, &abx500_temp_group); | |
410 | if (err < 0) { | |
411 | dev_err(&pdev->dev, "Create sysfs group failed (%d)\n", err); | |
412 | return err; | |
413 | } | |
414 | ||
415 | data->hwmon_dev = hwmon_device_register(&pdev->dev); | |
416 | if (IS_ERR(data->hwmon_dev)) { | |
417 | err = PTR_ERR(data->hwmon_dev); | |
418 | dev_err(&pdev->dev, "Class registration failed (%d)\n", err); | |
419 | goto exit_sysfs_group; | |
420 | } | |
421 | ||
422 | if (data->ops.irq_handler) { | |
423 | err = setup_irqs(pdev); | |
424 | if (err < 0) | |
425 | goto exit_hwmon_reg; | |
426 | } | |
427 | return 0; | |
428 | ||
429 | exit_hwmon_reg: | |
430 | hwmon_device_unregister(data->hwmon_dev); | |
431 | exit_sysfs_group: | |
432 | sysfs_remove_group(&pdev->dev.kobj, &abx500_temp_group); | |
433 | return err; | |
434 | } | |
435 | ||
436 | static int abx500_temp_remove(struct platform_device *pdev) | |
437 | { | |
438 | struct abx500_temp *data = platform_get_drvdata(pdev); | |
439 | ||
440 | cancel_delayed_work_sync(&data->work); | |
441 | hwmon_device_unregister(data->hwmon_dev); | |
442 | sysfs_remove_group(&pdev->dev.kobj, &abx500_temp_group); | |
443 | ||
444 | return 0; | |
445 | } | |
446 | ||
447 | static int abx500_temp_suspend(struct platform_device *pdev, | |
448 | pm_message_t state) | |
449 | { | |
450 | struct abx500_temp *data = platform_get_drvdata(pdev); | |
451 | ||
452 | if (data->work_active) | |
453 | cancel_delayed_work_sync(&data->work); | |
454 | ||
455 | return 0; | |
456 | } | |
457 | ||
458 | static int abx500_temp_resume(struct platform_device *pdev) | |
459 | { | |
460 | struct abx500_temp *data = platform_get_drvdata(pdev); | |
461 | ||
462 | if (data->work_active) | |
463 | schedule_monitor(data); | |
464 | ||
465 | return 0; | |
466 | } | |
467 | ||
468 | #ifdef CONFIG_OF | |
469 | static const struct of_device_id abx500_temp_match[] = { | |
470 | { .compatible = "stericsson,abx500-temp" }, | |
471 | {}, | |
472 | }; | |
473 | #endif | |
474 | ||
475 | static struct platform_driver abx500_temp_driver = { | |
476 | .driver = { | |
477 | .owner = THIS_MODULE, | |
478 | .name = "abx500-temp", | |
479 | .of_match_table = of_match_ptr(abx500_temp_match), | |
480 | }, | |
481 | .suspend = abx500_temp_suspend, | |
482 | .resume = abx500_temp_resume, | |
483 | .probe = abx500_temp_probe, | |
484 | .remove = abx500_temp_remove, | |
485 | }; | |
486 | ||
487 | module_platform_driver(abx500_temp_driver); | |
488 | ||
489 | MODULE_AUTHOR("Martin Persson <martin.persson@stericsson.com>"); | |
490 | MODULE_DESCRIPTION("ABX500 temperature driver"); | |
491 | MODULE_LICENSE("GPL"); |