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_new = 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"); 488