drivers/hwmon/rockchip-hwmon.c

   1 /*
   2  * Copyright (C) rockchip 2014
   3  * Author:zhangqing <zhangqing@rock-chips.com>
   4  *
   5  * License Terms: GNU General Public License v2
   6  *
   7  * rockchip tsadc does not provide auto tsADC, 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  */
  12
  13 #include <linux/err.h>
  14 #include <linux/hwmon.h>
  15 #include <linux/hwmon-sysfs.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/jiffies.h>
  18 #include <linux/module.h>
  19 #include <linux/mutex.h>
  20 #include <linux/of.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/pm.h>
  23 #include <linux/slab.h>
  24 #include <linux/sysfs.h>
  25 #include <linux/workqueue.h>
  26 #include "hwmon-rockchip.h"
  27
  28
  29 #define DEFAULT_MONITOR_DELAY   HZ
  30 #define DEFAULT_MAX_TEMP        130
  31
  32 static inline void schedule_monitor(struct rockchip_temp *data)
  33 {
  34         data->work_active = true;
  35         schedule_delayed_work(&data->work, DEFAULT_MONITOR_DELAY);
  36 }
  37
  38 static void threshold_updated(struct rockchip_temp *data)
  39 {
  40         int i;
  41         for (i = 0; i < data->monitored_sensors; i++)
  42                 if (data->max[i] != 0 || data->min[i] != 0) {
  43                         schedule_monitor(data);
  44                         return;
  45                 }
  46
  47         dev_dbg(&data->pdev->dev, "No active thresholds.\n");
  48         cancel_delayed_work_sync(&data->work);
  49         data->work_active = false;
  50 }
  51
  52 static void tsadc_monitor(struct work_struct *work)
  53 {
  54         int temp,i, ret;
  55         char alarm_node[30];
  56         bool updated_min_alarm, updated_max_alarm;
  57         struct rockchip_temp *data;
  58
  59         data = container_of(work, struct rockchip_temp, work.work);
  60         mutex_lock(&data->lock);
  61
  62         for (i = 0; i < data->monitored_sensors; i++) {
  63                 /* Thresholds are considered inactive if set to 0 */
  64                 if (data->max[i] == 0 && data->min[i] == 0)
  65                         continue;
  66
  67                 if (data->max[i] < data->min[i])
  68                         continue;
  69
  70                 temp = data->ops.read_sensor(data->tsadc_addr[i]);
  71                 if (temp == 150) {
  72                         dev_err(&data->pdev->dev, "TSADC read failed\n");
  73                         continue;
  74                 }
  75
  76                 updated_min_alarm = false;
  77                 updated_max_alarm = false;
  78
  79                 if (data->min[i] != 0) {
  80                         if (temp < data->min[i]) {
  81                                 if (data->min_alarm[i] == false) {
  82                                         data->min_alarm[i] = true;
  83                                         updated_min_alarm = true;
  84                                 }
  85                         } else {
  86                                 if (data->min_alarm[i] == true) {
  87                                         data->min_alarm[i] = false;
  88                                         updated_min_alarm = true;
  89                                 }
  90                         }
  91                 }
  92                 if (data->max[i] != 0) {
  93                         if (temp > data->max[i]) {
  94                                 if (data->max_alarm[i] == false) {
  95                                         data->max_alarm[i] = true;
  96                                         updated_max_alarm = true;
  97                                 }
  98                         } else if (temp < data->max[i] - data->max_hyst[i]) {
  99                                 if (data->max_alarm[i] == true) {
 100                                         data->max_alarm[i] = false;
 101                                         updated_max_alarm = true;
 102                                 }
 103                         }
 104                 }
 105
 106                 if (updated_min_alarm) {
 107                         ret = sprintf(alarm_node, "temp%d_min_alarm", i + 1);
 108                         sysfs_notify(&data->pdev->dev.kobj, NULL, alarm_node);
 109                 }
 110                 if (updated_max_alarm) {
 111                         ret = sprintf(alarm_node, "temp%d_max_alarm", i + 1);
 112                         sysfs_notify(&data->pdev->dev.kobj, NULL, alarm_node);
 113                 }
 114         }
 115
 116         schedule_monitor(data);
 117         mutex_unlock(&data->lock);
 118 }
 119
 120 /* HWMON sysfs interfaces */
 121 static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
 122                          char *buf)
 123 {
 124         struct rockchip_temp *data = dev_get_drvdata(dev);
 125         /* Show chip name */
 126         return data->ops.show_name(dev, devattr, buf);
 127 }
 128
 129 static ssize_t show_label(struct device *dev,
 130                           struct device_attribute *devattr, char *buf)
 131 {
 132         struct rockchip_temp *data = dev_get_drvdata(dev);
 133         /* Show each sensor label */
 134         return data->ops.show_label(dev, devattr, buf);
 135 }
 136
 137 static ssize_t show_input(struct device *dev,
 138                           struct device_attribute *devattr, char *buf)
 139 {
 140         int  temp;
 141         struct rockchip_temp *data = dev_get_drvdata(dev);
 142         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 143         u8 tsadc_addr = data->tsadc_addr[attr->index];
 144
 145         temp = data->ops.read_sensor(tsadc_addr);
 146
 147         return sprintf(buf, "%d\n", temp);
 148 }
 149
 150 /* Set functions (RW nodes) */
 151 static ssize_t set_min(struct device *dev, struct device_attribute *devattr,
 152                        const char *buf, size_t count)
 153 {
 154         unsigned long val;
 155         struct rockchip_temp *data = dev_get_drvdata(dev);
 156         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 157         int res = kstrtol(buf, 10, &val);
 158         if (res < 0)
 159                 return res;
 160
 161         val = clamp_val(val, 0, DEFAULT_MAX_TEMP);
 162
 163         mutex_lock(&data->lock);
 164         data->min[attr->index] = val;
 165         threshold_updated(data);
 166         mutex_unlock(&data->lock);
 167
 168         return count;
 169 }
 170
 171 static ssize_t set_max(struct device *dev, struct device_attribute *devattr,
 172                        const char *buf, size_t count)
 173 {
 174         unsigned long val;
 175         struct rockchip_temp *data = dev_get_drvdata(dev);
 176         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 177         int res = kstrtol(buf, 10, &val);
 178         if (res < 0)
 179                 return res;
 180
 181         val = clamp_val(val, 0, DEFAULT_MAX_TEMP);
 182
 183         mutex_lock(&data->lock);
 184         data->max[attr->index] = val;
 185         threshold_updated(data);
 186         mutex_unlock(&data->lock);
 187
 188         return count;
 189 }
 190
 191 static ssize_t set_max_hyst(struct device *dev,
 192                             struct device_attribute *devattr,
 193                             const char *buf, size_t count)
 194 {
 195         unsigned long val;
 196         struct rockchip_temp *data = dev_get_drvdata(dev);
 197         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 198         int res = kstrtoul(buf, 10, &val);
 199         if (res < 0)
 200                 return res;
 201
 202         val = clamp_val(val, 0, DEFAULT_MAX_TEMP);
 203
 204         mutex_lock(&data->lock);
 205         data->max_hyst[attr->index] = val;
 206         threshold_updated(data);
 207         mutex_unlock(&data->lock);
 208
 209         return count;
 210 }
 211
 212 /* Show functions (RO nodes) */
 213 static ssize_t show_min(struct device *dev,
 214                         struct device_attribute *devattr, char *buf)
 215 {
 216         struct rockchip_temp *data = dev_get_drvdata(dev);
 217         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 218
 219         return sprintf(buf, "%ld\n", data->min[attr->index]);
 220 }
 221
 222 static ssize_t show_max(struct device *dev,
 223                         struct device_attribute *devattr, char *buf)
 224 {
 225         struct rockchip_temp *data = dev_get_drvdata(dev);
 226         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 227
 228         return sprintf(buf, "%ld\n", data->max[attr->index]);
 229 }
 230
 231 static ssize_t show_max_hyst(struct device *dev,
 232                              struct device_attribute *devattr, char *buf)
 233 {
 234         struct rockchip_temp *data = dev_get_drvdata(dev);
 235         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 236
 237         return sprintf(buf, "%ld\n", data->max_hyst[attr->index]);
 238 }
 239
 240 static ssize_t show_min_alarm(struct device *dev,
 241                               struct device_attribute *devattr, char *buf)
 242 {
 243         struct rockchip_temp *data = dev_get_drvdata(dev);
 244         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 245
 246         return sprintf(buf, "%d\n", data->min_alarm[attr->index]);
 247 }
 248
 249 static ssize_t show_max_alarm(struct device *dev,
 250                               struct device_attribute *devattr, char *buf)
 251 {
 252         struct rockchip_temp *data = dev_get_drvdata(dev);
 253         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 254
 255         return sprintf(buf, "%d\n", data->max_alarm[attr->index]);
 256 }
 257
 258 static umode_t rockchip_attrs_visible(struct kobject *kobj,
 259                                    struct attribute *attr, int n)
 260 {
 261         struct device *dev = container_of(kobj, struct device, kobj);
 262         struct rockchip_temp *data = dev_get_drvdata(dev);
 263
 264         if (data->ops.is_visible)
 265                 return data->ops.is_visible(attr, n);
 266
 267         return attr->mode;
 268 }
 269
 270 /* Chip name, required by hwmon */
 271 static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
 272
 273 /* GPADC - SENSOR0 */
 274 static SENSOR_DEVICE_ATTR(temp0_label, S_IRUGO, show_label, NULL, 0);
 275 static SENSOR_DEVICE_ATTR(temp0_input, S_IRUGO, show_input, NULL, 0);
 276 static SENSOR_DEVICE_ATTR(temp0_min, S_IWUSR | S_IRUGO, show_min, set_min, 0);
 277 static SENSOR_DEVICE_ATTR(temp0_max, S_IWUSR | S_IRUGO, show_max, set_max, 0);
 278 static SENSOR_DEVICE_ATTR(temp0_max_hyst, S_IWUSR | S_IRUGO,
 279                           show_max_hyst, set_max_hyst, 0);
 280 static SENSOR_DEVICE_ATTR(temp0_min_alarm, S_IRUGO, show_min_alarm, NULL, 0);
 281 static SENSOR_DEVICE_ATTR(temp0_max_alarm, S_IRUGO, show_max_alarm, NULL, 0);
 282
 283 /* GPADC - SENSOR1 */
 284 static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL, 1);
 285 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 1);
 286 static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_min, set_min, 1);
 287 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_max, set_max, 1);
 288 static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
 289                           show_max_hyst, set_max_hyst, 1);
 290 static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_min_alarm, NULL, 1);
 291 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_max_alarm, NULL, 1);
 292
 293 /* GPADC - SENSOR2 */
 294 static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL, 2);
 295 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2);
 296 static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_min, set_min, 2);
 297 static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_max, set_max, 2);
 298 static SENSOR_DEVICE_ATTR(temp2_max_hyst, S_IWUSR | S_IRUGO,
 299                           show_max_hyst, set_max_hyst, 2);
 300 static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_min_alarm, NULL, 2);
 301 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_max_alarm, NULL, 2);
 302
 303 /* GPADC - SENSOR3 */
 304 static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, show_label, NULL, 3);
 305 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_input, NULL, 3);
 306 static SENSOR_DEVICE_ATTR(temp3_min, S_IWUSR | S_IRUGO, show_min, set_min, 3);
 307 static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_max, set_max, 3);
 308 static SENSOR_DEVICE_ATTR(temp3_max_hyst, S_IWUSR | S_IRUGO,
 309                           show_max_hyst, set_max_hyst, 3);
 310 static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_min_alarm, NULL, 3);
 311 static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_max_alarm, NULL, 3);
 312
 313
 314 struct attribute *rockchip_temp_attributes[] = {
 315         &sensor_dev_attr_name.dev_attr.attr,
 316
 317         &sensor_dev_attr_temp0_label.dev_attr.attr,
 318         &sensor_dev_attr_temp0_input.dev_attr.attr,
 319         &sensor_dev_attr_temp0_min.dev_attr.attr,
 320         &sensor_dev_attr_temp0_max.dev_attr.attr,
 321         &sensor_dev_attr_temp0_max_hyst.dev_attr.attr,
 322         &sensor_dev_attr_temp0_min_alarm.dev_attr.attr,
 323         &sensor_dev_attr_temp0_max_alarm.dev_attr.attr,
 324
 325         &sensor_dev_attr_temp1_label.dev_attr.attr,
 326         &sensor_dev_attr_temp1_input.dev_attr.attr,
 327         &sensor_dev_attr_temp1_min.dev_attr.attr,
 328         &sensor_dev_attr_temp1_max.dev_attr.attr,
 329         &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
 330         &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 331         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 332
 333         &sensor_dev_attr_temp2_label.dev_attr.attr,
 334         &sensor_dev_attr_temp2_input.dev_attr.attr,
 335         &sensor_dev_attr_temp2_min.dev_attr.attr,
 336         &sensor_dev_attr_temp2_max.dev_attr.attr,
 337         &sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
 338         &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
 339         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 340
 341         &sensor_dev_attr_temp3_label.dev_attr.attr,
 342         &sensor_dev_attr_temp3_input.dev_attr.attr,
 343         &sensor_dev_attr_temp3_min.dev_attr.attr,
 344         &sensor_dev_attr_temp3_max.dev_attr.attr,
 345         &sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
 346         &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
 347         &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
 348
 349
 350         NULL
 351 };
 352
 353 static const struct attribute_group rockchip_temp_group = {
 354         .attrs = rockchip_temp_attributes,
 355         .is_visible = rockchip_attrs_visible,
 356 };
 357
 358 static int rockchip_temp_probe(struct platform_device *pdev)
 359 {
 360         struct rockchip_temp *data;
 361         int err;
 362         printk("%s,line=%d\n", __func__,__LINE__);
 363
 364         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 365         if (!data)
 366                 return -ENOMEM;
 367         data->pdev = pdev;
 368         mutex_init(&data->lock);
 369
 370         /* Chip specific initialization */
 371         err = rockchip_hwmon_init(data);
 372         if (err < 0 || !data->ops.read_sensor || !data->ops.show_name ||
 373                         !data->ops.show_label)
 374                 return err;
 375
 376         INIT_DEFERRABLE_WORK(&data->work, tsadc_monitor);
 377         platform_set_drvdata(pdev, data);
 378
 379         err = sysfs_create_group(&pdev->dev.kobj, &rockchip_temp_group);
 380         if (err < 0) {
 381                 dev_err(&pdev->dev, "Create sysfs group failed (%d)\n", err);
 382                 return err;
 383         }
 384         data->hwmon_dev = hwmon_device_register(&pdev->dev);
 385         if (IS_ERR(data->hwmon_dev)) {
 386                 err = PTR_ERR(data->hwmon_dev);
 387                 dev_err(&pdev->dev, "Class registration failed (%d)\n", err);
 388                 goto exit_sysfs_group;
 389         }
 390         return 0;
 391
 392 exit_sysfs_group:
 393         sysfs_remove_group(&pdev->dev.kobj, &rockchip_temp_group);
 394         return err;
 395 }
 396
 397 static int rockchip_temp_remove(struct platform_device *pdev)
 398 {
 399         struct rockchip_temp *data = platform_get_drvdata(pdev);
 400
 401         cancel_delayed_work_sync(&data->work);
 402         hwmon_device_unregister(data->hwmon_dev);
 403         sysfs_remove_group(&pdev->dev.kobj, &rockchip_temp_group);
 404
 405         return 0;
 406 }
 407
 408 static int rockchip_temp_suspend(struct platform_device *pdev,
 409                                pm_message_t state)
 410 {
 411         struct rockchip_temp *data = platform_get_drvdata(pdev);
 412
 413         if (data->work_active)
 414                 cancel_delayed_work_sync(&data->work);
 415
 416         return 0;
 417 }
 418
 419 static int rockchip_temp_resume(struct platform_device *pdev)
 420 {
 421         struct rockchip_temp *data = platform_get_drvdata(pdev);
 422
 423         if (data->work_active)
 424                 schedule_monitor(data);
 425
 426         return 0;
 427 }
 428
 429 #ifdef CONFIG_OF
 430 static const struct of_device_id rockchip_temp_match[] = {
 431         { .compatible = "rockchip,tsadc" },
 432         {},
 433 };
 434 #endif
 435
 436 static struct platform_driver rockchip_temp_driver = {
 437         .driver = {
 438                 .owner = THIS_MODULE,
 439                 .name = "tsadc",
 440                 .of_match_table = of_match_ptr(rockchip_temp_match),
 441         },
 442         .suspend = rockchip_temp_suspend,
 443         .resume = rockchip_temp_resume,
 444         .probe = rockchip_temp_probe,
 445         .remove = rockchip_temp_remove,
 446 };
 447
 448 module_platform_driver(rockchip_temp_driver);
 449
 450 MODULE_AUTHOR("<rockchip>");
 451 MODULE_DESCRIPTION("rockchip temperature driver");
 452 MODULE_LICENSE("GPL");
 453