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Linux/drivers/hwmon/abx500.c

  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 
263 static umode_t abx500_attrs_visible(struct kobject *kobj,
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 
318 static struct attribute *abx500_temp_attributes[] = {
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");
492 

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