drivers/hwmon/da9052-hwmon.c

   1 /*
   2  * HWMON Driver for Dialog DA9052
   3  *
   4  * Copyright(c) 2012 Dialog Semiconductor Ltd.
   5  *
   6  * Author: David Dajun Chen <dchen@diasemi.com>
   7  *
   8  *  This program is free software; you can redistribute  it and/or modify it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  *
  13  */
  14
  15 #include <linux/err.h>
  16 #include <linux/hwmon.h>
  17 #include <linux/hwmon-sysfs.h>
  18 #include <linux/init.h>
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/slab.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/property.h>
  24
  25 #include <linux/mfd/da9052/da9052.h>
  26 #include <linux/mfd/da9052/reg.h>
  27 #include <linux/regulator/consumer.h>
  28
  29 struct da9052_hwmon {
  30         struct da9052           *da9052;
  31         struct mutex            hwmon_lock;
  32         bool                    tsi_as_adc;
  33         int                     tsiref_mv;
  34         struct regulator        *tsiref;
  35         struct completion       tsidone;
  36 };
  37
  38 static const char * const input_names[] = {
  39         [DA9052_ADC_VDDOUT]     =       "VDDOUT",
  40         [DA9052_ADC_ICH]        =       "CHARGING CURRENT",
  41         [DA9052_ADC_TBAT]       =       "BATTERY TEMP",
  42         [DA9052_ADC_VBAT]       =       "BATTERY VOLTAGE",
  43         [DA9052_ADC_IN4]        =       "ADC IN4",
  44         [DA9052_ADC_IN5]        =       "ADC IN5",
  45         [DA9052_ADC_IN6]        =       "ADC IN6",
  46         [DA9052_ADC_TSI_XP]     =       "ADC TS X+",
  47         [DA9052_ADC_TSI_YP]     =       "ADC TS Y+",
  48         [DA9052_ADC_TSI_XN]     =       "ADC TS X-",
  49         [DA9052_ADC_TSI_YN]     =       "ADC TS Y-",
  50         [DA9052_ADC_TJUNC]      =       "BATTERY JUNCTION TEMP",
  51         [DA9052_ADC_VBBAT]      =       "BACK-UP BATTERY VOLTAGE",
  52 };
  53
  54 /* Conversion function for VDDOUT and VBAT */
  55 static inline int volt_reg_to_mv(int value)
  56 {
  57         return DIV_ROUND_CLOSEST(value * 2000, 1023) + 2500;
  58 }
  59
  60 /* Conversion function for ADC channels 4, 5 and 6 */
  61 static inline int input_reg_to_mv(int value)
  62 {
  63         return DIV_ROUND_CLOSEST(value * 2500, 1023);
  64 }
  65
  66 /* Conversion function for VBBAT */
  67 static inline int vbbat_reg_to_mv(int value)
  68 {
  69         return DIV_ROUND_CLOSEST(value * 5000, 1023);
  70 }
  71
  72 static inline int input_tsireg_to_mv(struct da9052_hwmon *hwmon, int value)
  73 {
  74         return DIV_ROUND_CLOSEST(value * hwmon->tsiref_mv, 1023);
  75 }
  76
  77 static inline int da9052_enable_vddout_channel(struct da9052 *da9052)
  78 {
  79         return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
  80                                  DA9052_ADCCONT_AUTOVDDEN,
  81                                  DA9052_ADCCONT_AUTOVDDEN);
  82 }
  83
  84 static inline int da9052_disable_vddout_channel(struct da9052 *da9052)
  85 {
  86         return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
  87                                  DA9052_ADCCONT_AUTOVDDEN, 0);
  88 }
  89
  90 static ssize_t da9052_read_vddout(struct device *dev,
  91                                   struct device_attribute *devattr, char *buf)
  92 {
  93         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
  94         int ret, vdd;
  95
  96         mutex_lock(&hwmon->hwmon_lock);
  97
  98         ret = da9052_enable_vddout_channel(hwmon->da9052);
  99         if (ret < 0)
 100                 goto hwmon_err;
 101
 102         vdd = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG);
 103         if (vdd < 0) {
 104                 ret = vdd;
 105                 goto hwmon_err_release;
 106         }
 107
 108         ret = da9052_disable_vddout_channel(hwmon->da9052);
 109         if (ret < 0)
 110                 goto hwmon_err;
 111
 112         mutex_unlock(&hwmon->hwmon_lock);
 113         return sprintf(buf, "%d\n", volt_reg_to_mv(vdd));
 114
 115 hwmon_err_release:
 116         da9052_disable_vddout_channel(hwmon->da9052);
 117 hwmon_err:
 118         mutex_unlock(&hwmon->hwmon_lock);
 119         return ret;
 120 }
 121
 122 static ssize_t da9052_read_ich(struct device *dev,
 123                                struct device_attribute *devattr, char *buf)
 124 {
 125         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 126         int ret;
 127
 128         ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG);
 129         if (ret < 0)
 130                 return ret;
 131
 132         /* Equivalent to 3.9mA/bit in register ICHG_AV */
 133         return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret * 39, 10));
 134 }
 135
 136 static ssize_t da9052_read_tbat(struct device *dev,
 137                                 struct device_attribute *devattr, char *buf)
 138 {
 139         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 140
 141         return sprintf(buf, "%d\n", da9052_adc_read_temp(hwmon->da9052));
 142 }
 143
 144 static ssize_t da9052_read_vbat(struct device *dev,
 145                                 struct device_attribute *devattr, char *buf)
 146 {
 147         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 148         int ret;
 149
 150         ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT);
 151         if (ret < 0)
 152                 return ret;
 153
 154         return sprintf(buf, "%d\n", volt_reg_to_mv(ret));
 155 }
 156
 157 static ssize_t da9052_read_misc_channel(struct device *dev,
 158                                         struct device_attribute *devattr,
 159                                         char *buf)
 160 {
 161         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 162         int channel = to_sensor_dev_attr(devattr)->index;
 163         int ret;
 164
 165         ret = da9052_adc_manual_read(hwmon->da9052, channel);
 166         if (ret < 0)
 167                 return ret;
 168
 169         return sprintf(buf, "%d\n", input_reg_to_mv(ret));
 170 }
 171
 172 static int da9052_request_tsi_read(struct da9052_hwmon *hwmon, int channel)
 173 {
 174         u8 val = DA9052_TSICONTB_TSIMAN;
 175
 176         switch (channel) {
 177         case DA9052_ADC_TSI_XP:
 178                 val |= DA9052_TSICONTB_TSIMUX_XP;
 179                 break;
 180         case DA9052_ADC_TSI_YP:
 181                 val |= DA9052_TSICONTB_TSIMUX_YP;
 182                 break;
 183         case DA9052_ADC_TSI_XN:
 184                 val |= DA9052_TSICONTB_TSIMUX_XN;
 185                 break;
 186         case DA9052_ADC_TSI_YN:
 187                 val |= DA9052_TSICONTB_TSIMUX_YN;
 188                 break;
 189         }
 190
 191         return da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_B_REG, val);
 192 }
 193
 194 static int da9052_get_tsi_result(struct da9052_hwmon *hwmon, int channel)
 195 {
 196         u8 regs[3];
 197         int msb, lsb, err;
 198
 199         /* block read to avoid separation of MSB and LSB */
 200         err = da9052_group_read(hwmon->da9052, DA9052_TSI_X_MSB_REG,
 201                                 ARRAY_SIZE(regs), regs);
 202         if (err)
 203                 return err;
 204
 205         switch (channel) {
 206         case DA9052_ADC_TSI_XP:
 207         case DA9052_ADC_TSI_XN:
 208                 msb = regs[0] << DA9052_TSILSB_TSIXL_BITS;
 209                 lsb = regs[2] & DA9052_TSILSB_TSIXL;
 210                 lsb >>= DA9052_TSILSB_TSIXL_SHIFT;
 211                 break;
 212         case DA9052_ADC_TSI_YP:
 213         case DA9052_ADC_TSI_YN:
 214                 msb = regs[1] << DA9052_TSILSB_TSIYL_BITS;
 215                 lsb = regs[2] & DA9052_TSILSB_TSIYL;
 216                 lsb >>= DA9052_TSILSB_TSIYL_SHIFT;
 217                 break;
 218         default:
 219                 return -EINVAL;
 220         }
 221
 222         return msb | lsb;
 223 }
 224
 225
 226 static ssize_t __da9052_read_tsi(struct device *dev, int channel)
 227 {
 228         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 229         int ret;
 230
 231         reinit_completion(&hwmon->tsidone);
 232
 233         ret = da9052_request_tsi_read(hwmon, channel);
 234         if (ret < 0)
 235                 return ret;
 236
 237         /* Wait for an conversion done interrupt */
 238         if (!wait_for_completion_timeout(&hwmon->tsidone,
 239                                          msecs_to_jiffies(500)))
 240                 return -ETIMEDOUT;
 241
 242         return da9052_get_tsi_result(hwmon, channel);
 243 }
 244
 245 static ssize_t da9052_read_tsi(struct device *dev,
 246                                struct device_attribute *devattr,
 247                                char *buf)
 248 {
 249         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 250         int channel = to_sensor_dev_attr(devattr)->index;
 251         int ret;
 252
 253         mutex_lock(&hwmon->da9052->auxadc_lock);
 254         ret = __da9052_read_tsi(dev, channel);
 255         mutex_unlock(&hwmon->da9052->auxadc_lock);
 256
 257         if (ret < 0)
 258                 return ret;
 259         else
 260                 return sprintf(buf, "%d\n", input_tsireg_to_mv(hwmon, ret));
 261 }
 262
 263 static ssize_t da9052_read_tjunc(struct device *dev,
 264                                  struct device_attribute *devattr, char *buf)
 265 {
 266         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 267         int tjunc;
 268         int toffset;
 269
 270         tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG);
 271         if (tjunc < 0)
 272                 return tjunc;
 273
 274         toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG);
 275         if (toffset < 0)
 276                 return toffset;
 277
 278         /*
 279          * Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8
 280          * T_OFFSET is a trim value used to improve accuracy of the result
 281          */
 282         return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800);
 283 }
 284
 285 static ssize_t da9052_read_vbbat(struct device *dev,
 286                                  struct device_attribute *devattr, char *buf)
 287 {
 288         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 289         int ret;
 290
 291         ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT);
 292         if (ret < 0)
 293                 return ret;
 294
 295         return sprintf(buf, "%d\n", vbbat_reg_to_mv(ret));
 296 }
 297
 298 static ssize_t show_label(struct device *dev,
 299                           struct device_attribute *devattr, char *buf)
 300 {
 301         return sprintf(buf, "%s\n",
 302                        input_names[to_sensor_dev_attr(devattr)->index]);
 303 }
 304
 305 static umode_t da9052_channel_is_visible(struct kobject *kobj,
 306                                          struct attribute *attr, int index)
 307 {
 308         struct device *dev = container_of(kobj, struct device, kobj);
 309         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 310         struct device_attribute *dattr = container_of(attr,
 311                                 struct device_attribute, attr);
 312         struct sensor_device_attribute *sattr = to_sensor_dev_attr(dattr);
 313
 314         if (!hwmon->tsi_as_adc) {
 315                 switch (sattr->index) {
 316                 case DA9052_ADC_TSI_XP:
 317                 case DA9052_ADC_TSI_YP:
 318                 case DA9052_ADC_TSI_XN:
 319                 case DA9052_ADC_TSI_YN:
 320                         return 0;
 321                 }
 322         }
 323
 324         return attr->mode;
 325 }
 326
 327 static SENSOR_DEVICE_ATTR(in0_input, 0444, da9052_read_vddout, NULL,
 328                           DA9052_ADC_VDDOUT);
 329 static SENSOR_DEVICE_ATTR(in0_label, 0444, show_label, NULL,
 330                           DA9052_ADC_VDDOUT);
 331 static SENSOR_DEVICE_ATTR(in3_input, 0444, da9052_read_vbat, NULL,
 332                           DA9052_ADC_VBAT);
 333 static SENSOR_DEVICE_ATTR(in3_label, 0444, show_label, NULL,
 334                           DA9052_ADC_VBAT);
 335 static SENSOR_DEVICE_ATTR(in4_input, 0444, da9052_read_misc_channel, NULL,
 336                           DA9052_ADC_IN4);
 337 static SENSOR_DEVICE_ATTR(in4_label, 0444, show_label, NULL,
 338                           DA9052_ADC_IN4);
 339 static SENSOR_DEVICE_ATTR(in5_input, 0444, da9052_read_misc_channel, NULL,
 340                           DA9052_ADC_IN5);
 341 static SENSOR_DEVICE_ATTR(in5_label, 0444, show_label, NULL,
 342                           DA9052_ADC_IN5);
 343 static SENSOR_DEVICE_ATTR(in6_input, 0444, da9052_read_misc_channel, NULL,
 344                           DA9052_ADC_IN6);
 345 static SENSOR_DEVICE_ATTR(in6_label, 0444, show_label, NULL,
 346                           DA9052_ADC_IN6);
 347 static SENSOR_DEVICE_ATTR(in9_input, 0444, da9052_read_vbbat, NULL,
 348                           DA9052_ADC_VBBAT);
 349 static SENSOR_DEVICE_ATTR(in9_label, 0444, show_label, NULL,
 350                           DA9052_ADC_VBBAT);
 351
 352 static SENSOR_DEVICE_ATTR(in70_input, 0444, da9052_read_tsi, NULL,
 353                           DA9052_ADC_TSI_XP);
 354 static SENSOR_DEVICE_ATTR(in70_label, 0444, show_label, NULL,
 355                           DA9052_ADC_TSI_XP);
 356 static SENSOR_DEVICE_ATTR(in71_input, 0444, da9052_read_tsi, NULL,
 357                           DA9052_ADC_TSI_XN);
 358 static SENSOR_DEVICE_ATTR(in71_label, 0444, show_label, NULL,
 359                           DA9052_ADC_TSI_XN);
 360 static SENSOR_DEVICE_ATTR(in72_input, 0444, da9052_read_tsi, NULL,
 361                           DA9052_ADC_TSI_YP);
 362 static SENSOR_DEVICE_ATTR(in72_label, 0444, show_label, NULL,
 363                           DA9052_ADC_TSI_YP);
 364 static SENSOR_DEVICE_ATTR(in73_input, 0444, da9052_read_tsi, NULL,
 365                           DA9052_ADC_TSI_YN);
 366 static SENSOR_DEVICE_ATTR(in73_label, 0444, show_label, NULL,
 367                           DA9052_ADC_TSI_YN);
 368
 369 static SENSOR_DEVICE_ATTR(curr1_input, 0444, da9052_read_ich, NULL,
 370                           DA9052_ADC_ICH);
 371 static SENSOR_DEVICE_ATTR(curr1_label, 0444, show_label, NULL,
 372                           DA9052_ADC_ICH);
 373
 374 static SENSOR_DEVICE_ATTR(temp2_input, 0444, da9052_read_tbat, NULL,
 375                           DA9052_ADC_TBAT);
 376 static SENSOR_DEVICE_ATTR(temp2_label, 0444, show_label, NULL,
 377                           DA9052_ADC_TBAT);
 378 static SENSOR_DEVICE_ATTR(temp8_input, 0444, da9052_read_tjunc, NULL,
 379                           DA9052_ADC_TJUNC);
 380 static SENSOR_DEVICE_ATTR(temp8_label, 0444, show_label, NULL,
 381                           DA9052_ADC_TJUNC);
 382
 383 static struct attribute *da9052_attrs[] = {
 384         &sensor_dev_attr_in0_input.dev_attr.attr,
 385         &sensor_dev_attr_in0_label.dev_attr.attr,
 386         &sensor_dev_attr_in3_input.dev_attr.attr,
 387         &sensor_dev_attr_in3_label.dev_attr.attr,
 388         &sensor_dev_attr_in4_input.dev_attr.attr,
 389         &sensor_dev_attr_in4_label.dev_attr.attr,
 390         &sensor_dev_attr_in5_input.dev_attr.attr,
 391         &sensor_dev_attr_in5_label.dev_attr.attr,
 392         &sensor_dev_attr_in6_input.dev_attr.attr,
 393         &sensor_dev_attr_in6_label.dev_attr.attr,
 394         &sensor_dev_attr_in70_input.dev_attr.attr,
 395         &sensor_dev_attr_in70_label.dev_attr.attr,
 396         &sensor_dev_attr_in71_input.dev_attr.attr,
 397         &sensor_dev_attr_in71_label.dev_attr.attr,
 398         &sensor_dev_attr_in72_input.dev_attr.attr,
 399         &sensor_dev_attr_in72_label.dev_attr.attr,
 400         &sensor_dev_attr_in73_input.dev_attr.attr,
 401         &sensor_dev_attr_in73_label.dev_attr.attr,
 402         &sensor_dev_attr_in9_input.dev_attr.attr,
 403         &sensor_dev_attr_in9_label.dev_attr.attr,
 404         &sensor_dev_attr_curr1_input.dev_attr.attr,
 405         &sensor_dev_attr_curr1_label.dev_attr.attr,
 406         &sensor_dev_attr_temp2_input.dev_attr.attr,
 407         &sensor_dev_attr_temp2_label.dev_attr.attr,
 408         &sensor_dev_attr_temp8_input.dev_attr.attr,
 409         &sensor_dev_attr_temp8_label.dev_attr.attr,
 410         NULL
 411 };
 412
 413 static const struct attribute_group da9052_group = {
 414         .attrs = da9052_attrs,
 415         .is_visible = da9052_channel_is_visible,
 416 };
 417 __ATTRIBUTE_GROUPS(da9052);
 418
 419 static irqreturn_t da9052_tsi_datardy_irq(int irq, void *data)
 420 {
 421         struct da9052_hwmon *hwmon = data;
 422
 423         complete(&hwmon->tsidone);
 424         return IRQ_HANDLED;
 425 }
 426
 427 static int da9052_hwmon_probe(struct platform_device *pdev)
 428 {
 429         struct device *dev = &pdev->dev;
 430         struct da9052_hwmon *hwmon;
 431         struct device *hwmon_dev;
 432         int err;
 433
 434         hwmon = devm_kzalloc(dev, sizeof(struct da9052_hwmon), GFP_KERNEL);
 435         if (!hwmon)
 436                 return -ENOMEM;
 437
 438         platform_set_drvdata(pdev, hwmon);
 439
 440         mutex_init(&hwmon->hwmon_lock);
 441         hwmon->da9052 = dev_get_drvdata(pdev->dev.parent);
 442
 443         init_completion(&hwmon->tsidone);
 444
 445         hwmon->tsi_as_adc =
 446                 device_property_read_bool(pdev->dev.parent, "dlg,tsi-as-adc");
 447
 448         if (hwmon->tsi_as_adc) {
 449                 hwmon->tsiref = devm_regulator_get(pdev->dev.parent, "tsiref");
 450                 if (IS_ERR(hwmon->tsiref)) {
 451                         err = PTR_ERR(hwmon->tsiref);
 452                         dev_err(&pdev->dev, "failed to get tsiref: %d", err);
 453                         return err;
 454                 }
 455
 456                 err = regulator_enable(hwmon->tsiref);
 457                 if (err)
 458                         return err;
 459
 460                 hwmon->tsiref_mv = regulator_get_voltage(hwmon->tsiref);
 461                 if (hwmon->tsiref_mv < 0) {
 462                         err = hwmon->tsiref_mv;
 463                         goto exit_regulator;
 464                 }
 465
 466                 /* convert from microvolt (DT) to millivolt (hwmon) */
 467                 hwmon->tsiref_mv /= 1000;
 468
 469                 /* TSIREF limits from datasheet */
 470                 if (hwmon->tsiref_mv < 1800 || hwmon->tsiref_mv > 2600) {
 471                         dev_err(hwmon->da9052->dev, "invalid TSIREF voltage: %d",
 472                                 hwmon->tsiref_mv);
 473                         err = -ENXIO;
 474                         goto exit_regulator;
 475                 }
 476
 477                 /* disable touchscreen features */
 478                 da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_A_REG, 0x00);
 479
 480                 /* Sample every 1ms */
 481                 da9052_reg_update(hwmon->da9052, DA9052_ADC_CONT_REG,
 482                                           DA9052_ADCCONT_ADCMODE,
 483                                           DA9052_ADCCONT_ADCMODE);
 484
 485                 err = da9052_request_irq(hwmon->da9052, DA9052_IRQ_TSIREADY,
 486                                          "tsiready-irq", da9052_tsi_datardy_irq,
 487                                          hwmon);
 488                 if (err) {
 489                         dev_err(&pdev->dev, "Failed to register TSIRDY IRQ: %d",
 490                                 err);
 491                         goto exit_regulator;
 492                 }
 493         }
 494
 495         hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052",
 496                                                            hwmon,
 497                                                            da9052_groups);
 498         err = PTR_ERR_OR_ZERO(hwmon_dev);
 499         if (err)
 500                 goto exit_irq;
 501
 502         return 0;
 503
 504 exit_irq:
 505         if (hwmon->tsi_as_adc)
 506                 da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
 507 exit_regulator:
 508         if (hwmon->tsiref)
 509                 regulator_disable(hwmon->tsiref);
 510
 511         return err;
 512 }
 513
 514 static int da9052_hwmon_remove(struct platform_device *pdev)
 515 {
 516         struct da9052_hwmon *hwmon = platform_get_drvdata(pdev);
 517
 518         if (hwmon->tsi_as_adc) {
 519                 da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
 520                 regulator_disable(hwmon->tsiref);
 521         }
 522
 523         return 0;
 524 }
 525
 526 static struct platform_driver da9052_hwmon_driver = {
 527         .probe = da9052_hwmon_probe,
 528         .remove = da9052_hwmon_remove,
 529         .driver = {
 530                 .name = "da9052-hwmon",
 531         },
 532 };
 533
 534 module_platform_driver(da9052_hwmon_driver);
 535
 536 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 537 MODULE_DESCRIPTION("DA9052 HWMON driver");
 538 MODULE_LICENSE("GPL");
 539 MODULE_ALIAS("platform:da9052-hwmon");