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_vddout_show(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_ich_show(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_tbat_show(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_vbat_show(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_misc_channel_show(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_tsi_show(struct device *dev, 246 struct device_attribute *devattr, char *buf) 247 { 248 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 249 int channel = to_sensor_dev_attr(devattr)->index; 250 int ret; 251 252 mutex_lock(&hwmon->hwmon_lock); 253 ret = __da9052_read_tsi(dev, channel); 254 mutex_unlock(&hwmon->hwmon_lock); 255 256 if (ret < 0) 257 return ret; 258 else 259 return sprintf(buf, "%d\n", input_tsireg_to_mv(hwmon, ret)); 260 } 261 262 static ssize_t da9052_tjunc_show(struct device *dev, 263 struct device_attribute *devattr, char *buf) 264 { 265 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 266 int tjunc; 267 int toffset; 268 269 tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG); 270 if (tjunc < 0) 271 return tjunc; 272 273 toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG); 274 if (toffset < 0) 275 return toffset; 276 277 /* 278 * Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8 279 * T_OFFSET is a trim value used to improve accuracy of the result 280 */ 281 return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800); 282 } 283 284 static ssize_t da9052_vbbat_show(struct device *dev, 285 struct device_attribute *devattr, char *buf) 286 { 287 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 288 int ret; 289 290 ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT); 291 if (ret < 0) 292 return ret; 293 294 return sprintf(buf, "%d\n", vbbat_reg_to_mv(ret)); 295 } 296 297 static ssize_t label_show(struct device *dev, 298 struct device_attribute *devattr, char *buf) 299 { 300 return sprintf(buf, "%s\n", 301 input_names[to_sensor_dev_attr(devattr)->index]); 302 } 303 304 static umode_t da9052_channel_is_visible(struct kobject *kobj, 305 struct attribute *attr, int index) 306 { 307 struct device *dev = container_of(kobj, struct device, kobj); 308 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 309 struct device_attribute *dattr = container_of(attr, 310 struct device_attribute, attr); 311 struct sensor_device_attribute *sattr = to_sensor_dev_attr(dattr); 312 313 if (!hwmon->tsi_as_adc) { 314 switch (sattr->index) { 315 case DA9052_ADC_TSI_XP: 316 case DA9052_ADC_TSI_YP: 317 case DA9052_ADC_TSI_XN: 318 case DA9052_ADC_TSI_YN: 319 return 0; 320 } 321 } 322 323 return attr->mode; 324 } 325 326 static SENSOR_DEVICE_ATTR_RO(in0_input, da9052_vddout, DA9052_ADC_VDDOUT); 327 static SENSOR_DEVICE_ATTR_RO(in0_label, label, DA9052_ADC_VDDOUT); 328 static SENSOR_DEVICE_ATTR_RO(in3_input, da9052_vbat, DA9052_ADC_VBAT); 329 static SENSOR_DEVICE_ATTR_RO(in3_label, label, DA9052_ADC_VBAT); 330 static SENSOR_DEVICE_ATTR_RO(in4_input, da9052_misc_channel, DA9052_ADC_IN4); 331 static SENSOR_DEVICE_ATTR_RO(in4_label, label, DA9052_ADC_IN4); 332 static SENSOR_DEVICE_ATTR_RO(in5_input, da9052_misc_channel, DA9052_ADC_IN5); 333 static SENSOR_DEVICE_ATTR_RO(in5_label, label, DA9052_ADC_IN5); 334 static SENSOR_DEVICE_ATTR_RO(in6_input, da9052_misc_channel, DA9052_ADC_IN6); 335 static SENSOR_DEVICE_ATTR_RO(in6_label, label, DA9052_ADC_IN6); 336 static SENSOR_DEVICE_ATTR_RO(in9_input, da9052_vbbat, DA9052_ADC_VBBAT); 337 static SENSOR_DEVICE_ATTR_RO(in9_label, label, DA9052_ADC_VBBAT); 338 339 static SENSOR_DEVICE_ATTR_RO(in70_input, da9052_tsi, DA9052_ADC_TSI_XP); 340 static SENSOR_DEVICE_ATTR_RO(in70_label, label, DA9052_ADC_TSI_XP); 341 static SENSOR_DEVICE_ATTR_RO(in71_input, da9052_tsi, DA9052_ADC_TSI_XN); 342 static SENSOR_DEVICE_ATTR_RO(in71_label, label, DA9052_ADC_TSI_XN); 343 static SENSOR_DEVICE_ATTR_RO(in72_input, da9052_tsi, DA9052_ADC_TSI_YP); 344 static SENSOR_DEVICE_ATTR_RO(in72_label, label, DA9052_ADC_TSI_YP); 345 static SENSOR_DEVICE_ATTR_RO(in73_input, da9052_tsi, DA9052_ADC_TSI_YN); 346 static SENSOR_DEVICE_ATTR_RO(in73_label, label, DA9052_ADC_TSI_YN); 347 348 static SENSOR_DEVICE_ATTR_RO(curr1_input, da9052_ich, DA9052_ADC_ICH); 349 static SENSOR_DEVICE_ATTR_RO(curr1_label, label, DA9052_ADC_ICH); 350 351 static SENSOR_DEVICE_ATTR_RO(temp2_input, da9052_tbat, DA9052_ADC_TBAT); 352 static SENSOR_DEVICE_ATTR_RO(temp2_label, label, DA9052_ADC_TBAT); 353 static SENSOR_DEVICE_ATTR_RO(temp8_input, da9052_tjunc, DA9052_ADC_TJUNC); 354 static SENSOR_DEVICE_ATTR_RO(temp8_label, label, DA9052_ADC_TJUNC); 355 356 static struct attribute *da9052_attrs[] = { 357 &sensor_dev_attr_in0_input.dev_attr.attr, 358 &sensor_dev_attr_in0_label.dev_attr.attr, 359 &sensor_dev_attr_in3_input.dev_attr.attr, 360 &sensor_dev_attr_in3_label.dev_attr.attr, 361 &sensor_dev_attr_in4_input.dev_attr.attr, 362 &sensor_dev_attr_in4_label.dev_attr.attr, 363 &sensor_dev_attr_in5_input.dev_attr.attr, 364 &sensor_dev_attr_in5_label.dev_attr.attr, 365 &sensor_dev_attr_in6_input.dev_attr.attr, 366 &sensor_dev_attr_in6_label.dev_attr.attr, 367 &sensor_dev_attr_in70_input.dev_attr.attr, 368 &sensor_dev_attr_in70_label.dev_attr.attr, 369 &sensor_dev_attr_in71_input.dev_attr.attr, 370 &sensor_dev_attr_in71_label.dev_attr.attr, 371 &sensor_dev_attr_in72_input.dev_attr.attr, 372 &sensor_dev_attr_in72_label.dev_attr.attr, 373 &sensor_dev_attr_in73_input.dev_attr.attr, 374 &sensor_dev_attr_in73_label.dev_attr.attr, 375 &sensor_dev_attr_in9_input.dev_attr.attr, 376 &sensor_dev_attr_in9_label.dev_attr.attr, 377 &sensor_dev_attr_curr1_input.dev_attr.attr, 378 &sensor_dev_attr_curr1_label.dev_attr.attr, 379 &sensor_dev_attr_temp2_input.dev_attr.attr, 380 &sensor_dev_attr_temp2_label.dev_attr.attr, 381 &sensor_dev_attr_temp8_input.dev_attr.attr, 382 &sensor_dev_attr_temp8_label.dev_attr.attr, 383 NULL 384 }; 385 386 static const struct attribute_group da9052_group = { 387 .attrs = da9052_attrs, 388 .is_visible = da9052_channel_is_visible, 389 }; 390 __ATTRIBUTE_GROUPS(da9052); 391 392 static irqreturn_t da9052_tsi_datardy_irq(int irq, void *data) 393 { 394 struct da9052_hwmon *hwmon = data; 395 396 complete(&hwmon->tsidone); 397 return IRQ_HANDLED; 398 } 399 400 static int da9052_hwmon_probe(struct platform_device *pdev) 401 { 402 struct device *dev = &pdev->dev; 403 struct da9052_hwmon *hwmon; 404 struct device *hwmon_dev; 405 int err; 406 407 hwmon = devm_kzalloc(dev, sizeof(struct da9052_hwmon), GFP_KERNEL); 408 if (!hwmon) 409 return -ENOMEM; 410 411 platform_set_drvdata(pdev, hwmon); 412 413 mutex_init(&hwmon->hwmon_lock); 414 hwmon->da9052 = dev_get_drvdata(pdev->dev.parent); 415 416 init_completion(&hwmon->tsidone); 417 418 hwmon->tsi_as_adc = 419 device_property_read_bool(pdev->dev.parent, "dlg,tsi-as-adc"); 420 421 if (hwmon->tsi_as_adc) { 422 hwmon->tsiref = devm_regulator_get(pdev->dev.parent, "tsiref"); 423 if (IS_ERR(hwmon->tsiref)) { 424 err = PTR_ERR(hwmon->tsiref); 425 dev_err(&pdev->dev, "failed to get tsiref: %d", err); 426 return err; 427 } 428 429 err = regulator_enable(hwmon->tsiref); 430 if (err) 431 return err; 432 433 hwmon->tsiref_mv = regulator_get_voltage(hwmon->tsiref); 434 if (hwmon->tsiref_mv < 0) { 435 err = hwmon->tsiref_mv; 436 goto exit_regulator; 437 } 438 439 /* convert from microvolt (DT) to millivolt (hwmon) */ 440 hwmon->tsiref_mv /= 1000; 441 442 /* TSIREF limits from datasheet */ 443 if (hwmon->tsiref_mv < 1800 || hwmon->tsiref_mv > 2600) { 444 dev_err(hwmon->da9052->dev, "invalid TSIREF voltage: %d", 445 hwmon->tsiref_mv); 446 err = -ENXIO; 447 goto exit_regulator; 448 } 449 450 /* disable touchscreen features */ 451 da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_A_REG, 0x00); 452 453 /* Sample every 1ms */ 454 da9052_reg_update(hwmon->da9052, DA9052_ADC_CONT_REG, 455 DA9052_ADCCONT_ADCMODE, 456 DA9052_ADCCONT_ADCMODE); 457 458 err = da9052_request_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, 459 "tsiready-irq", da9052_tsi_datardy_irq, 460 hwmon); 461 if (err) { 462 dev_err(&pdev->dev, "Failed to register TSIRDY IRQ: %d", 463 err); 464 goto exit_regulator; 465 } 466 } 467 468 hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052", 469 hwmon, 470 da9052_groups); 471 err = PTR_ERR_OR_ZERO(hwmon_dev); 472 if (err) 473 goto exit_irq; 474 475 return 0; 476 477 exit_irq: 478 if (hwmon->tsi_as_adc) 479 da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon); 480 exit_regulator: 481 if (hwmon->tsiref) 482 regulator_disable(hwmon->tsiref); 483 484 return err; 485 } 486 487 static int da9052_hwmon_remove(struct platform_device *pdev) 488 { 489 struct da9052_hwmon *hwmon = platform_get_drvdata(pdev); 490 491 if (hwmon->tsi_as_adc) { 492 da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon); 493 regulator_disable(hwmon->tsiref); 494 } 495 496 return 0; 497 } 498 499 static struct platform_driver da9052_hwmon_driver = { 500 .probe = da9052_hwmon_probe, 501 .remove = da9052_hwmon_remove, 502 .driver = { 503 .name = "da9052-hwmon", 504 }, 505 }; 506 507 module_platform_driver(da9052_hwmon_driver); 508 509 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 510 MODULE_DESCRIPTION("DA9052 HWMON driver"); 511 MODULE_LICENSE("GPL"); 512 MODULE_ALIAS("platform:da9052-hwmon"); 513