drivers/hwmon/da9052-hwmon.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * HWMON Driver for Dialog DA9052
   4  *
   5  * Copyright(c) 2012 Dialog Semiconductor Ltd.
   6  *
   7  * Author: David Dajun Chen <dchen@diasemi.com>
   8  */
   9
  10 #include <linux/err.h>
  11 #include <linux/hwmon.h>
  12 #include <linux/hwmon-sysfs.h>
  13 #include <linux/init.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/slab.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/property.h>
  19
  20 #include <linux/mfd/da9052/da9052.h>
  21 #include <linux/mfd/da9052/reg.h>
  22 #include <linux/regulator/consumer.h>
  23
  24 struct da9052_hwmon {
  25         struct da9052           *da9052;
  26         struct mutex            hwmon_lock;
  27         bool                    tsi_as_adc;
  28         int                     tsiref_mv;
  29         struct completion       tsidone;
  30 };
  31
  32 static const char * const input_names[] = {
  33         [DA9052_ADC_VDDOUT]     =       "VDDOUT",
  34         [DA9052_ADC_ICH]        =       "CHARGING CURRENT",
  35         [DA9052_ADC_TBAT]       =       "BATTERY TEMP",
  36         [DA9052_ADC_VBAT]       =       "BATTERY VOLTAGE",
  37         [DA9052_ADC_IN4]        =       "ADC IN4",
  38         [DA9052_ADC_IN5]        =       "ADC IN5",
  39         [DA9052_ADC_IN6]        =       "ADC IN6",
  40         [DA9052_ADC_TSI_XP]     =       "ADC TS X+",
  41         [DA9052_ADC_TSI_YP]     =       "ADC TS Y+",
  42         [DA9052_ADC_TSI_XN]     =       "ADC TS X-",
  43         [DA9052_ADC_TSI_YN]     =       "ADC TS Y-",
  44         [DA9052_ADC_TJUNC]      =       "BATTERY JUNCTION TEMP",
  45         [DA9052_ADC_VBBAT]      =       "BACK-UP BATTERY VOLTAGE",
  46 };
  47
  48 /* Conversion function for VDDOUT and VBAT */
  49 static inline int volt_reg_to_mv(int value)
  50 {
  51         return DIV_ROUND_CLOSEST(value * 2000, 1023) + 2500;
  52 }
  53
  54 /* Conversion function for ADC channels 4, 5 and 6 */
  55 static inline int input_reg_to_mv(int value)
  56 {
  57         return DIV_ROUND_CLOSEST(value * 2500, 1023);
  58 }
  59
  60 /* Conversion function for VBBAT */
  61 static inline int vbbat_reg_to_mv(int value)
  62 {
  63         return DIV_ROUND_CLOSEST(value * 5000, 1023);
  64 }
  65
  66 static inline int input_tsireg_to_mv(struct da9052_hwmon *hwmon, int value)
  67 {
  68         return DIV_ROUND_CLOSEST(value * hwmon->tsiref_mv, 1023);
  69 }
  70
  71 static inline int da9052_enable_vddout_channel(struct da9052 *da9052)
  72 {
  73         return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
  74                                  DA9052_ADCCONT_AUTOVDDEN,
  75                                  DA9052_ADCCONT_AUTOVDDEN);
  76 }
  77
  78 static inline int da9052_disable_vddout_channel(struct da9052 *da9052)
  79 {
  80         return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
  81                                  DA9052_ADCCONT_AUTOVDDEN, 0);
  82 }
  83
  84 static ssize_t da9052_vddout_show(struct device *dev,
  85                                   struct device_attribute *devattr, char *buf)
  86 {
  87         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
  88         int ret, vdd;
  89
  90         mutex_lock(&hwmon->hwmon_lock);
  91
  92         ret = da9052_enable_vddout_channel(hwmon->da9052);
  93         if (ret < 0)
  94                 goto hwmon_err;
  95
  96         vdd = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG);
  97         if (vdd < 0) {
  98                 ret = vdd;
  99                 goto hwmon_err_release;
 100         }
 101
 102         ret = da9052_disable_vddout_channel(hwmon->da9052);
 103         if (ret < 0)
 104                 goto hwmon_err;
 105
 106         mutex_unlock(&hwmon->hwmon_lock);
 107         return sprintf(buf, "%d\n", volt_reg_to_mv(vdd));
 108
 109 hwmon_err_release:
 110         da9052_disable_vddout_channel(hwmon->da9052);
 111 hwmon_err:
 112         mutex_unlock(&hwmon->hwmon_lock);
 113         return ret;
 114 }
 115
 116 static ssize_t da9052_ich_show(struct device *dev,
 117                                struct device_attribute *devattr, char *buf)
 118 {
 119         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 120         int ret;
 121
 122         ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG);
 123         if (ret < 0)
 124                 return ret;
 125
 126         /* Equivalent to 3.9mA/bit in register ICHG_AV */
 127         return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret * 39, 10));
 128 }
 129
 130 static ssize_t da9052_tbat_show(struct device *dev,
 131                                 struct device_attribute *devattr, char *buf)
 132 {
 133         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 134
 135         return sprintf(buf, "%d\n", da9052_adc_read_temp(hwmon->da9052));
 136 }
 137
 138 static ssize_t da9052_vbat_show(struct device *dev,
 139                                 struct device_attribute *devattr, char *buf)
 140 {
 141         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 142         int ret;
 143
 144         ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT);
 145         if (ret < 0)
 146                 return ret;
 147
 148         return sprintf(buf, "%d\n", volt_reg_to_mv(ret));
 149 }
 150
 151 static ssize_t da9052_misc_channel_show(struct device *dev,
 152                                         struct device_attribute *devattr,
 153                                         char *buf)
 154 {
 155         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 156         int channel = to_sensor_dev_attr(devattr)->index;
 157         int ret;
 158
 159         ret = da9052_adc_manual_read(hwmon->da9052, channel);
 160         if (ret < 0)
 161                 return ret;
 162
 163         return sprintf(buf, "%d\n", input_reg_to_mv(ret));
 164 }
 165
 166 static int da9052_request_tsi_read(struct da9052_hwmon *hwmon, int channel)
 167 {
 168         u8 val = DA9052_TSICONTB_TSIMAN;
 169
 170         switch (channel) {
 171         case DA9052_ADC_TSI_XP:
 172                 val |= DA9052_TSICONTB_TSIMUX_XP;
 173                 break;
 174         case DA9052_ADC_TSI_YP:
 175                 val |= DA9052_TSICONTB_TSIMUX_YP;
 176                 break;
 177         case DA9052_ADC_TSI_XN:
 178                 val |= DA9052_TSICONTB_TSIMUX_XN;
 179                 break;
 180         case DA9052_ADC_TSI_YN:
 181                 val |= DA9052_TSICONTB_TSIMUX_YN;
 182                 break;
 183         }
 184
 185         return da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_B_REG, val);
 186 }
 187
 188 static int da9052_get_tsi_result(struct da9052_hwmon *hwmon, int channel)
 189 {
 190         u8 regs[3];
 191         int msb, lsb, err;
 192
 193         /* block read to avoid separation of MSB and LSB */
 194         err = da9052_group_read(hwmon->da9052, DA9052_TSI_X_MSB_REG,
 195                                 ARRAY_SIZE(regs), regs);
 196         if (err)
 197                 return err;
 198
 199         switch (channel) {
 200         case DA9052_ADC_TSI_XP:
 201         case DA9052_ADC_TSI_XN:
 202                 msb = regs[0] << DA9052_TSILSB_TSIXL_BITS;
 203                 lsb = regs[2] & DA9052_TSILSB_TSIXL;
 204                 lsb >>= DA9052_TSILSB_TSIXL_SHIFT;
 205                 break;
 206         case DA9052_ADC_TSI_YP:
 207         case DA9052_ADC_TSI_YN:
 208                 msb = regs[1] << DA9052_TSILSB_TSIYL_BITS;
 209                 lsb = regs[2] & DA9052_TSILSB_TSIYL;
 210                 lsb >>= DA9052_TSILSB_TSIYL_SHIFT;
 211                 break;
 212         default:
 213                 return -EINVAL;
 214         }
 215
 216         return msb | lsb;
 217 }
 218
 219
 220 static ssize_t __da9052_read_tsi(struct device *dev, int channel)
 221 {
 222         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 223         int ret;
 224
 225         reinit_completion(&hwmon->tsidone);
 226
 227         ret = da9052_request_tsi_read(hwmon, channel);
 228         if (ret < 0)
 229                 return ret;
 230
 231         /* Wait for an conversion done interrupt */
 232         if (!wait_for_completion_timeout(&hwmon->tsidone,
 233                                          msecs_to_jiffies(500)))
 234                 return -ETIMEDOUT;
 235
 236         return da9052_get_tsi_result(hwmon, channel);
 237 }
 238
 239 static ssize_t da9052_tsi_show(struct device *dev,
 240                                struct device_attribute *devattr, char *buf)
 241 {
 242         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 243         int channel = to_sensor_dev_attr(devattr)->index;
 244         int ret;
 245
 246         mutex_lock(&hwmon->da9052->auxadc_lock);
 247         ret = __da9052_read_tsi(dev, channel);
 248         mutex_unlock(&hwmon->da9052->auxadc_lock);
 249
 250         if (ret < 0)
 251                 return ret;
 252         else
 253                 return sprintf(buf, "%d\n", input_tsireg_to_mv(hwmon, ret));
 254 }
 255
 256 static ssize_t da9052_tjunc_show(struct device *dev,
 257                                  struct device_attribute *devattr, char *buf)
 258 {
 259         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 260         int tjunc;
 261         int toffset;
 262
 263         tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG);
 264         if (tjunc < 0)
 265                 return tjunc;
 266
 267         toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG);
 268         if (toffset < 0)
 269                 return toffset;
 270
 271         /*
 272          * Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8
 273          * T_OFFSET is a trim value used to improve accuracy of the result
 274          */
 275         return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800);
 276 }
 277
 278 static ssize_t da9052_vbbat_show(struct device *dev,
 279                                  struct device_attribute *devattr, char *buf)
 280 {
 281         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 282         int ret;
 283
 284         ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT);
 285         if (ret < 0)
 286                 return ret;
 287
 288         return sprintf(buf, "%d\n", vbbat_reg_to_mv(ret));
 289 }
 290
 291 static ssize_t label_show(struct device *dev,
 292                           struct device_attribute *devattr, char *buf)
 293 {
 294         return sprintf(buf, "%s\n",
 295                        input_names[to_sensor_dev_attr(devattr)->index]);
 296 }
 297
 298 static umode_t da9052_channel_is_visible(struct kobject *kobj,
 299                                          struct attribute *attr, int index)
 300 {
 301         struct device *dev = kobj_to_dev(kobj);
 302         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 303         struct device_attribute *dattr = container_of(attr,
 304                                 struct device_attribute, attr);
 305         struct sensor_device_attribute *sattr = to_sensor_dev_attr(dattr);
 306
 307         if (!hwmon->tsi_as_adc) {
 308                 switch (sattr->index) {
 309                 case DA9052_ADC_TSI_XP:
 310                 case DA9052_ADC_TSI_YP:
 311                 case DA9052_ADC_TSI_XN:
 312                 case DA9052_ADC_TSI_YN:
 313                         return 0;
 314                 }
 315         }
 316
 317         return attr->mode;
 318 }
 319
 320 static SENSOR_DEVICE_ATTR_RO(in0_input, da9052_vddout, DA9052_ADC_VDDOUT);
 321 static SENSOR_DEVICE_ATTR_RO(in0_label, label, DA9052_ADC_VDDOUT);
 322 static SENSOR_DEVICE_ATTR_RO(in3_input, da9052_vbat, DA9052_ADC_VBAT);
 323 static SENSOR_DEVICE_ATTR_RO(in3_label, label, DA9052_ADC_VBAT);
 324 static SENSOR_DEVICE_ATTR_RO(in4_input, da9052_misc_channel, DA9052_ADC_IN4);
 325 static SENSOR_DEVICE_ATTR_RO(in4_label, label, DA9052_ADC_IN4);
 326 static SENSOR_DEVICE_ATTR_RO(in5_input, da9052_misc_channel, DA9052_ADC_IN5);
 327 static SENSOR_DEVICE_ATTR_RO(in5_label, label, DA9052_ADC_IN5);
 328 static SENSOR_DEVICE_ATTR_RO(in6_input, da9052_misc_channel, DA9052_ADC_IN6);
 329 static SENSOR_DEVICE_ATTR_RO(in6_label, label, DA9052_ADC_IN6);
 330 static SENSOR_DEVICE_ATTR_RO(in9_input, da9052_vbbat, DA9052_ADC_VBBAT);
 331 static SENSOR_DEVICE_ATTR_RO(in9_label, label, DA9052_ADC_VBBAT);
 332
 333 static SENSOR_DEVICE_ATTR_RO(in70_input, da9052_tsi, DA9052_ADC_TSI_XP);
 334 static SENSOR_DEVICE_ATTR_RO(in70_label, label, DA9052_ADC_TSI_XP);
 335 static SENSOR_DEVICE_ATTR_RO(in71_input, da9052_tsi, DA9052_ADC_TSI_XN);
 336 static SENSOR_DEVICE_ATTR_RO(in71_label, label, DA9052_ADC_TSI_XN);
 337 static SENSOR_DEVICE_ATTR_RO(in72_input, da9052_tsi, DA9052_ADC_TSI_YP);
 338 static SENSOR_DEVICE_ATTR_RO(in72_label, label, DA9052_ADC_TSI_YP);
 339 static SENSOR_DEVICE_ATTR_RO(in73_input, da9052_tsi, DA9052_ADC_TSI_YN);
 340 static SENSOR_DEVICE_ATTR_RO(in73_label, label, DA9052_ADC_TSI_YN);
 341
 342 static SENSOR_DEVICE_ATTR_RO(curr1_input, da9052_ich, DA9052_ADC_ICH);
 343 static SENSOR_DEVICE_ATTR_RO(curr1_label, label, DA9052_ADC_ICH);
 344
 345 static SENSOR_DEVICE_ATTR_RO(temp2_input, da9052_tbat, DA9052_ADC_TBAT);
 346 static SENSOR_DEVICE_ATTR_RO(temp2_label, label, DA9052_ADC_TBAT);
 347 static SENSOR_DEVICE_ATTR_RO(temp8_input, da9052_tjunc, DA9052_ADC_TJUNC);
 348 static SENSOR_DEVICE_ATTR_RO(temp8_label, label, DA9052_ADC_TJUNC);
 349
 350 static struct attribute *da9052_attrs[] = {
 351         &sensor_dev_attr_in0_input.dev_attr.attr,
 352         &sensor_dev_attr_in0_label.dev_attr.attr,
 353         &sensor_dev_attr_in3_input.dev_attr.attr,
 354         &sensor_dev_attr_in3_label.dev_attr.attr,
 355         &sensor_dev_attr_in4_input.dev_attr.attr,
 356         &sensor_dev_attr_in4_label.dev_attr.attr,
 357         &sensor_dev_attr_in5_input.dev_attr.attr,
 358         &sensor_dev_attr_in5_label.dev_attr.attr,
 359         &sensor_dev_attr_in6_input.dev_attr.attr,
 360         &sensor_dev_attr_in6_label.dev_attr.attr,
 361         &sensor_dev_attr_in70_input.dev_attr.attr,
 362         &sensor_dev_attr_in70_label.dev_attr.attr,
 363         &sensor_dev_attr_in71_input.dev_attr.attr,
 364         &sensor_dev_attr_in71_label.dev_attr.attr,
 365         &sensor_dev_attr_in72_input.dev_attr.attr,
 366         &sensor_dev_attr_in72_label.dev_attr.attr,
 367         &sensor_dev_attr_in73_input.dev_attr.attr,
 368         &sensor_dev_attr_in73_label.dev_attr.attr,
 369         &sensor_dev_attr_in9_input.dev_attr.attr,
 370         &sensor_dev_attr_in9_label.dev_attr.attr,
 371         &sensor_dev_attr_curr1_input.dev_attr.attr,
 372         &sensor_dev_attr_curr1_label.dev_attr.attr,
 373         &sensor_dev_attr_temp2_input.dev_attr.attr,
 374         &sensor_dev_attr_temp2_label.dev_attr.attr,
 375         &sensor_dev_attr_temp8_input.dev_attr.attr,
 376         &sensor_dev_attr_temp8_label.dev_attr.attr,
 377         NULL
 378 };
 379
 380 static const struct attribute_group da9052_group = {
 381         .attrs = da9052_attrs,
 382         .is_visible = da9052_channel_is_visible,
 383 };
 384 __ATTRIBUTE_GROUPS(da9052);
 385
 386 static irqreturn_t da9052_tsi_datardy_irq(int irq, void *data)
 387 {
 388         struct da9052_hwmon *hwmon = data;
 389
 390         complete(&hwmon->tsidone);
 391         return IRQ_HANDLED;
 392 }
 393
 394 static int da9052_hwmon_probe(struct platform_device *pdev)
 395 {
 396         struct device *dev = &pdev->dev;
 397         struct da9052_hwmon *hwmon;
 398         struct device *hwmon_dev;
 399         int err, tsiref_uv;
 400
 401         hwmon = devm_kzalloc(dev, sizeof(struct da9052_hwmon), GFP_KERNEL);
 402         if (!hwmon)
 403                 return -ENOMEM;
 404
 405         platform_set_drvdata(pdev, hwmon);
 406
 407         mutex_init(&hwmon->hwmon_lock);
 408         hwmon->da9052 = dev_get_drvdata(pdev->dev.parent);
 409
 410         init_completion(&hwmon->tsidone);
 411
 412         hwmon->tsi_as_adc =
 413                 device_property_read_bool(pdev->dev.parent, "dlg,tsi-as-adc");
 414
 415         if (hwmon->tsi_as_adc) {
 416                 tsiref_uv = devm_regulator_get_enable_read_voltage(dev->parent,
 417                                                                    "tsiref");
 418                 if (tsiref_uv < 0)
 419                         return dev_err_probe(dev, tsiref_uv,
 420                                              "failed to get tsiref voltage\n");
 421
 422                 /* convert from microvolt (DT) to millivolt (hwmon) */
 423                 hwmon->tsiref_mv = tsiref_uv / 1000;
 424
 425                 /* TSIREF limits from datasheet */
 426                 if (hwmon->tsiref_mv < 1800 || hwmon->tsiref_mv > 2600) {
 427                         dev_err(hwmon->da9052->dev, "invalid TSIREF voltage: %d",
 428                                 hwmon->tsiref_mv);
 429                         return -ENXIO;
 430                 }
 431
 432                 /* disable touchscreen features */
 433                 da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_A_REG, 0x00);
 434
 435                 /* Sample every 1ms */
 436                 da9052_reg_update(hwmon->da9052, DA9052_ADC_CONT_REG,
 437                                           DA9052_ADCCONT_ADCMODE,
 438                                           DA9052_ADCCONT_ADCMODE);
 439
 440                 err = da9052_request_irq(hwmon->da9052, DA9052_IRQ_TSIREADY,
 441                                          "tsiready-irq", da9052_tsi_datardy_irq,
 442                                          hwmon);
 443                 if (err) {
 444                         dev_err(&pdev->dev, "Failed to register TSIRDY IRQ: %d",
 445                                 err);
 446                         return err;
 447                 }
 448         }
 449
 450         hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052",
 451                                                            hwmon,
 452                                                            da9052_groups);
 453         err = PTR_ERR_OR_ZERO(hwmon_dev);
 454         if (err)
 455                 goto exit_irq;
 456
 457         return 0;
 458
 459 exit_irq:
 460         if (hwmon->tsi_as_adc)
 461                 da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
 462
 463         return err;
 464 }
 465
 466 static void da9052_hwmon_remove(struct platform_device *pdev)
 467 {
 468         struct da9052_hwmon *hwmon = platform_get_drvdata(pdev);
 469
 470         if (hwmon->tsi_as_adc)
 471                 da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
 472 }
 473
 474 static struct platform_driver da9052_hwmon_driver = {
 475         .probe = da9052_hwmon_probe,
 476         .remove = da9052_hwmon_remove,
 477         .driver = {
 478                 .name = "da9052-hwmon",
 479         },
 480 };
 481
 482 module_platform_driver(da9052_hwmon_driver);
 483
 484 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 485 MODULE_DESCRIPTION("DA9052 HWMON driver");
 486 MODULE_LICENSE("GPL");
 487 MODULE_ALIAS("platform:da9052-hwmon");