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 regulator *tsiref; 30 struct completion tsidone; 31 }; 32 33 static const char * const input_names[] = { 34 [DA9052_ADC_VDDOUT] = "VDDOUT", 35 [DA9052_ADC_ICH] = "CHARGING CURRENT", 36 [DA9052_ADC_TBAT] = "BATTERY TEMP", 37 [DA9052_ADC_VBAT] = "BATTERY VOLTAGE", 38 [DA9052_ADC_IN4] = "ADC IN4", 39 [DA9052_ADC_IN5] = "ADC IN5", 40 [DA9052_ADC_IN6] = "ADC IN6", 41 [DA9052_ADC_TSI_XP] = "ADC TS X+", 42 [DA9052_ADC_TSI_YP] = "ADC TS Y+", 43 [DA9052_ADC_TSI_XN] = "ADC TS X-", 44 [DA9052_ADC_TSI_YN] = "ADC TS Y-", 45 [DA9052_ADC_TJUNC] = "BATTERY JUNCTION TEMP", 46 [DA9052_ADC_VBBAT] = "BACK-UP BATTERY VOLTAGE", 47 }; 48 49 /* Conversion function for VDDOUT and VBAT */ 50 static inline int volt_reg_to_mv(int value) 51 { 52 return DIV_ROUND_CLOSEST(value * 2000, 1023) + 2500; 53 } 54 55 /* Conversion function for ADC channels 4, 5 and 6 */ 56 static inline int input_reg_to_mv(int value) 57 { 58 return DIV_ROUND_CLOSEST(value * 2500, 1023); 59 } 60 61 /* Conversion function for VBBAT */ 62 static inline int vbbat_reg_to_mv(int value) 63 { 64 return DIV_ROUND_CLOSEST(value * 5000, 1023); 65 } 66 67 static inline int input_tsireg_to_mv(struct da9052_hwmon *hwmon, int value) 68 { 69 return DIV_ROUND_CLOSEST(value * hwmon->tsiref_mv, 1023); 70 } 71 72 static inline int da9052_enable_vddout_channel(struct da9052 *da9052) 73 { 74 return da9052_reg_update(da9052, DA9052_ADC_CONT_REG, 75 DA9052_ADCCONT_AUTOVDDEN, 76 DA9052_ADCCONT_AUTOVDDEN); 77 } 78 79 static inline int da9052_disable_vddout_channel(struct da9052 *da9052) 80 { 81 return da9052_reg_update(da9052, DA9052_ADC_CONT_REG, 82 DA9052_ADCCONT_AUTOVDDEN, 0); 83 } 84 85 static ssize_t da9052_vddout_show(struct device *dev, 86 struct device_attribute *devattr, char *buf) 87 { 88 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 89 int ret, vdd; 90 91 mutex_lock(&hwmon->hwmon_lock); 92 93 ret = da9052_enable_vddout_channel(hwmon->da9052); 94 if (ret < 0) 95 goto hwmon_err; 96 97 vdd = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG); 98 if (vdd < 0) { 99 ret = vdd; 100 goto hwmon_err_release; 101 } 102 103 ret = da9052_disable_vddout_channel(hwmon->da9052); 104 if (ret < 0) 105 goto hwmon_err; 106 107 mutex_unlock(&hwmon->hwmon_lock); 108 return sprintf(buf, "%d\n", volt_reg_to_mv(vdd)); 109 110 hwmon_err_release: 111 da9052_disable_vddout_channel(hwmon->da9052); 112 hwmon_err: 113 mutex_unlock(&hwmon->hwmon_lock); 114 return ret; 115 } 116 117 static ssize_t da9052_ich_show(struct device *dev, 118 struct device_attribute *devattr, char *buf) 119 { 120 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 121 int ret; 122 123 ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG); 124 if (ret < 0) 125 return ret; 126 127 /* Equivalent to 3.9mA/bit in register ICHG_AV */ 128 return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret * 39, 10)); 129 } 130 131 static ssize_t da9052_tbat_show(struct device *dev, 132 struct device_attribute *devattr, char *buf) 133 { 134 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 135 136 return sprintf(buf, "%d\n", da9052_adc_read_temp(hwmon->da9052)); 137 } 138 139 static ssize_t da9052_vbat_show(struct device *dev, 140 struct device_attribute *devattr, char *buf) 141 { 142 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 143 int ret; 144 145 ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT); 146 if (ret < 0) 147 return ret; 148 149 return sprintf(buf, "%d\n", volt_reg_to_mv(ret)); 150 } 151 152 static ssize_t da9052_misc_channel_show(struct device *dev, 153 struct device_attribute *devattr, 154 char *buf) 155 { 156 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 157 int channel = to_sensor_dev_attr(devattr)->index; 158 int ret; 159 160 ret = da9052_adc_manual_read(hwmon->da9052, channel); 161 if (ret < 0) 162 return ret; 163 164 return sprintf(buf, "%d\n", input_reg_to_mv(ret)); 165 } 166 167 static int da9052_request_tsi_read(struct da9052_hwmon *hwmon, int channel) 168 { 169 u8 val = DA9052_TSICONTB_TSIMAN; 170 171 switch (channel) { 172 case DA9052_ADC_TSI_XP: 173 val |= DA9052_TSICONTB_TSIMUX_XP; 174 break; 175 case DA9052_ADC_TSI_YP: 176 val |= DA9052_TSICONTB_TSIMUX_YP; 177 break; 178 case DA9052_ADC_TSI_XN: 179 val |= DA9052_TSICONTB_TSIMUX_XN; 180 break; 181 case DA9052_ADC_TSI_YN: 182 val |= DA9052_TSICONTB_TSIMUX_YN; 183 break; 184 } 185 186 return da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_B_REG, val); 187 } 188 189 static int da9052_get_tsi_result(struct da9052_hwmon *hwmon, int channel) 190 { 191 u8 regs[3]; 192 int msb, lsb, err; 193 194 /* block read to avoid separation of MSB and LSB */ 195 err = da9052_group_read(hwmon->da9052, DA9052_TSI_X_MSB_REG, 196 ARRAY_SIZE(regs), regs); 197 if (err) 198 return err; 199 200 switch (channel) { 201 case DA9052_ADC_TSI_XP: 202 case DA9052_ADC_TSI_XN: 203 msb = regs[0] << DA9052_TSILSB_TSIXL_BITS; 204 lsb = regs[2] & DA9052_TSILSB_TSIXL; 205 lsb >>= DA9052_TSILSB_TSIXL_SHIFT; 206 break; 207 case DA9052_ADC_TSI_YP: 208 case DA9052_ADC_TSI_YN: 209 msb = regs[1] << DA9052_TSILSB_TSIYL_BITS; 210 lsb = regs[2] & DA9052_TSILSB_TSIYL; 211 lsb >>= DA9052_TSILSB_TSIYL_SHIFT; 212 break; 213 default: 214 return -EINVAL; 215 } 216 217 return msb | lsb; 218 } 219 220 221 static ssize_t __da9052_read_tsi(struct device *dev, int channel) 222 { 223 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 224 int ret; 225 226 reinit_completion(&hwmon->tsidone); 227 228 ret = da9052_request_tsi_read(hwmon, channel); 229 if (ret < 0) 230 return ret; 231 232 /* Wait for an conversion done interrupt */ 233 if (!wait_for_completion_timeout(&hwmon->tsidone, 234 msecs_to_jiffies(500))) 235 return -ETIMEDOUT; 236 237 return da9052_get_tsi_result(hwmon, channel); 238 } 239 240 static ssize_t da9052_tsi_show(struct device *dev, 241 struct device_attribute *devattr, char *buf) 242 { 243 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 244 int channel = to_sensor_dev_attr(devattr)->index; 245 int ret; 246 247 mutex_lock(&hwmon->da9052->auxadc_lock); 248 ret = __da9052_read_tsi(dev, channel); 249 mutex_unlock(&hwmon->da9052->auxadc_lock); 250 251 if (ret < 0) 252 return ret; 253 else 254 return sprintf(buf, "%d\n", input_tsireg_to_mv(hwmon, ret)); 255 } 256 257 static ssize_t da9052_tjunc_show(struct device *dev, 258 struct device_attribute *devattr, char *buf) 259 { 260 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 261 int tjunc; 262 int toffset; 263 264 tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG); 265 if (tjunc < 0) 266 return tjunc; 267 268 toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG); 269 if (toffset < 0) 270 return toffset; 271 272 /* 273 * Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8 274 * T_OFFSET is a trim value used to improve accuracy of the result 275 */ 276 return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800); 277 } 278 279 static ssize_t da9052_vbbat_show(struct device *dev, 280 struct device_attribute *devattr, char *buf) 281 { 282 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 283 int ret; 284 285 ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT); 286 if (ret < 0) 287 return ret; 288 289 return sprintf(buf, "%d\n", vbbat_reg_to_mv(ret)); 290 } 291 292 static ssize_t label_show(struct device *dev, 293 struct device_attribute *devattr, char *buf) 294 { 295 return sprintf(buf, "%s\n", 296 input_names[to_sensor_dev_attr(devattr)->index]); 297 } 298 299 static umode_t da9052_channel_is_visible(struct kobject *kobj, 300 struct attribute *attr, int index) 301 { 302 struct device *dev = kobj_to_dev(kobj); 303 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 304 struct device_attribute *dattr = container_of(attr, 305 struct device_attribute, attr); 306 struct sensor_device_attribute *sattr = to_sensor_dev_attr(dattr); 307 308 if (!hwmon->tsi_as_adc) { 309 switch (sattr->index) { 310 case DA9052_ADC_TSI_XP: 311 case DA9052_ADC_TSI_YP: 312 case DA9052_ADC_TSI_XN: 313 case DA9052_ADC_TSI_YN: 314 return 0; 315 } 316 } 317 318 return attr->mode; 319 } 320 321 static SENSOR_DEVICE_ATTR_RO(in0_input, da9052_vddout, DA9052_ADC_VDDOUT); 322 static SENSOR_DEVICE_ATTR_RO(in0_label, label, DA9052_ADC_VDDOUT); 323 static SENSOR_DEVICE_ATTR_RO(in3_input, da9052_vbat, DA9052_ADC_VBAT); 324 static SENSOR_DEVICE_ATTR_RO(in3_label, label, DA9052_ADC_VBAT); 325 static SENSOR_DEVICE_ATTR_RO(in4_input, da9052_misc_channel, DA9052_ADC_IN4); 326 static SENSOR_DEVICE_ATTR_RO(in4_label, label, DA9052_ADC_IN4); 327 static SENSOR_DEVICE_ATTR_RO(in5_input, da9052_misc_channel, DA9052_ADC_IN5); 328 static SENSOR_DEVICE_ATTR_RO(in5_label, label, DA9052_ADC_IN5); 329 static SENSOR_DEVICE_ATTR_RO(in6_input, da9052_misc_channel, DA9052_ADC_IN6); 330 static SENSOR_DEVICE_ATTR_RO(in6_label, label, DA9052_ADC_IN6); 331 static SENSOR_DEVICE_ATTR_RO(in9_input, da9052_vbbat, DA9052_ADC_VBBAT); 332 static SENSOR_DEVICE_ATTR_RO(in9_label, label, DA9052_ADC_VBBAT); 333 334 static SENSOR_DEVICE_ATTR_RO(in70_input, da9052_tsi, DA9052_ADC_TSI_XP); 335 static SENSOR_DEVICE_ATTR_RO(in70_label, label, DA9052_ADC_TSI_XP); 336 static SENSOR_DEVICE_ATTR_RO(in71_input, da9052_tsi, DA9052_ADC_TSI_XN); 337 static SENSOR_DEVICE_ATTR_RO(in71_label, label, DA9052_ADC_TSI_XN); 338 static SENSOR_DEVICE_ATTR_RO(in72_input, da9052_tsi, DA9052_ADC_TSI_YP); 339 static SENSOR_DEVICE_ATTR_RO(in72_label, label, DA9052_ADC_TSI_YP); 340 static SENSOR_DEVICE_ATTR_RO(in73_input, da9052_tsi, DA9052_ADC_TSI_YN); 341 static SENSOR_DEVICE_ATTR_RO(in73_label, label, DA9052_ADC_TSI_YN); 342 343 static SENSOR_DEVICE_ATTR_RO(curr1_input, da9052_ich, DA9052_ADC_ICH); 344 static SENSOR_DEVICE_ATTR_RO(curr1_label, label, DA9052_ADC_ICH); 345 346 static SENSOR_DEVICE_ATTR_RO(temp2_input, da9052_tbat, DA9052_ADC_TBAT); 347 static SENSOR_DEVICE_ATTR_RO(temp2_label, label, DA9052_ADC_TBAT); 348 static SENSOR_DEVICE_ATTR_RO(temp8_input, da9052_tjunc, DA9052_ADC_TJUNC); 349 static SENSOR_DEVICE_ATTR_RO(temp8_label, label, DA9052_ADC_TJUNC); 350 351 static struct attribute *da9052_attrs[] = { 352 &sensor_dev_attr_in0_input.dev_attr.attr, 353 &sensor_dev_attr_in0_label.dev_attr.attr, 354 &sensor_dev_attr_in3_input.dev_attr.attr, 355 &sensor_dev_attr_in3_label.dev_attr.attr, 356 &sensor_dev_attr_in4_input.dev_attr.attr, 357 &sensor_dev_attr_in4_label.dev_attr.attr, 358 &sensor_dev_attr_in5_input.dev_attr.attr, 359 &sensor_dev_attr_in5_label.dev_attr.attr, 360 &sensor_dev_attr_in6_input.dev_attr.attr, 361 &sensor_dev_attr_in6_label.dev_attr.attr, 362 &sensor_dev_attr_in70_input.dev_attr.attr, 363 &sensor_dev_attr_in70_label.dev_attr.attr, 364 &sensor_dev_attr_in71_input.dev_attr.attr, 365 &sensor_dev_attr_in71_label.dev_attr.attr, 366 &sensor_dev_attr_in72_input.dev_attr.attr, 367 &sensor_dev_attr_in72_label.dev_attr.attr, 368 &sensor_dev_attr_in73_input.dev_attr.attr, 369 &sensor_dev_attr_in73_label.dev_attr.attr, 370 &sensor_dev_attr_in9_input.dev_attr.attr, 371 &sensor_dev_attr_in9_label.dev_attr.attr, 372 &sensor_dev_attr_curr1_input.dev_attr.attr, 373 &sensor_dev_attr_curr1_label.dev_attr.attr, 374 &sensor_dev_attr_temp2_input.dev_attr.attr, 375 &sensor_dev_attr_temp2_label.dev_attr.attr, 376 &sensor_dev_attr_temp8_input.dev_attr.attr, 377 &sensor_dev_attr_temp8_label.dev_attr.attr, 378 NULL 379 }; 380 381 static const struct attribute_group da9052_group = { 382 .attrs = da9052_attrs, 383 .is_visible = da9052_channel_is_visible, 384 }; 385 __ATTRIBUTE_GROUPS(da9052); 386 387 static irqreturn_t da9052_tsi_datardy_irq(int irq, void *data) 388 { 389 struct da9052_hwmon *hwmon = data; 390 391 complete(&hwmon->tsidone); 392 return IRQ_HANDLED; 393 } 394 395 static int da9052_hwmon_probe(struct platform_device *pdev) 396 { 397 struct device *dev = &pdev->dev; 398 struct da9052_hwmon *hwmon; 399 struct device *hwmon_dev; 400 int err; 401 402 hwmon = devm_kzalloc(dev, sizeof(struct da9052_hwmon), GFP_KERNEL); 403 if (!hwmon) 404 return -ENOMEM; 405 406 platform_set_drvdata(pdev, hwmon); 407 408 mutex_init(&hwmon->hwmon_lock); 409 hwmon->da9052 = dev_get_drvdata(pdev->dev.parent); 410 411 init_completion(&hwmon->tsidone); 412 413 hwmon->tsi_as_adc = 414 device_property_read_bool(pdev->dev.parent, "dlg,tsi-as-adc"); 415 416 if (hwmon->tsi_as_adc) { 417 hwmon->tsiref = devm_regulator_get(pdev->dev.parent, "tsiref"); 418 if (IS_ERR(hwmon->tsiref)) { 419 err = PTR_ERR(hwmon->tsiref); 420 dev_err(&pdev->dev, "failed to get tsiref: %d", err); 421 return err; 422 } 423 424 err = regulator_enable(hwmon->tsiref); 425 if (err) 426 return err; 427 428 hwmon->tsiref_mv = regulator_get_voltage(hwmon->tsiref); 429 if (hwmon->tsiref_mv < 0) { 430 err = hwmon->tsiref_mv; 431 goto exit_regulator; 432 } 433 434 /* convert from microvolt (DT) to millivolt (hwmon) */ 435 hwmon->tsiref_mv /= 1000; 436 437 /* TSIREF limits from datasheet */ 438 if (hwmon->tsiref_mv < 1800 || hwmon->tsiref_mv > 2600) { 439 dev_err(hwmon->da9052->dev, "invalid TSIREF voltage: %d", 440 hwmon->tsiref_mv); 441 err = -ENXIO; 442 goto exit_regulator; 443 } 444 445 /* disable touchscreen features */ 446 da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_A_REG, 0x00); 447 448 /* Sample every 1ms */ 449 da9052_reg_update(hwmon->da9052, DA9052_ADC_CONT_REG, 450 DA9052_ADCCONT_ADCMODE, 451 DA9052_ADCCONT_ADCMODE); 452 453 err = da9052_request_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, 454 "tsiready-irq", da9052_tsi_datardy_irq, 455 hwmon); 456 if (err) { 457 dev_err(&pdev->dev, "Failed to register TSIRDY IRQ: %d", 458 err); 459 goto exit_regulator; 460 } 461 } 462 463 hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052", 464 hwmon, 465 da9052_groups); 466 err = PTR_ERR_OR_ZERO(hwmon_dev); 467 if (err) 468 goto exit_irq; 469 470 return 0; 471 472 exit_irq: 473 if (hwmon->tsi_as_adc) 474 da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon); 475 exit_regulator: 476 if (hwmon->tsiref) 477 regulator_disable(hwmon->tsiref); 478 479 return err; 480 } 481 482 static int da9052_hwmon_remove(struct platform_device *pdev) 483 { 484 struct da9052_hwmon *hwmon = platform_get_drvdata(pdev); 485 486 if (hwmon->tsi_as_adc) { 487 da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon); 488 regulator_disable(hwmon->tsiref); 489 } 490 491 return 0; 492 } 493 494 static struct platform_driver da9052_hwmon_driver = { 495 .probe = da9052_hwmon_probe, 496 .remove = da9052_hwmon_remove, 497 .driver = { 498 .name = "da9052-hwmon", 499 }, 500 }; 501 502 module_platform_driver(da9052_hwmon_driver); 503 504 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 505 MODULE_DESCRIPTION("DA9052 HWMON driver"); 506 MODULE_LICENSE("GPL"); 507 MODULE_ALIAS("platform:da9052-hwmon"); 508