1 /* 2 * Copyright 2016 Broadcom 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License, version 2, as 6 * published by the Free Software Foundation (the "GPL"). 7 * 8 * This program is distributed in the hope that it will be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 * General Public License version 2 (GPLv2) for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * version 2 (GPLv2) along with this source code. 15 */ 16 17 #include <linux/module.h> 18 #include <linux/of.h> 19 #include <linux/io.h> 20 #include <linux/clk.h> 21 #include <linux/mfd/syscon.h> 22 #include <linux/regmap.h> 23 #include <linux/delay.h> 24 #include <linux/interrupt.h> 25 #include <linux/platform_device.h> 26 27 #include <linux/iio/iio.h> 28 29 /* Below Register's are common to IPROC ADC and Touchscreen IP */ 30 #define IPROC_REGCTL1 0x00 31 #define IPROC_REGCTL2 0x04 32 #define IPROC_INTERRUPT_THRES 0x08 33 #define IPROC_INTERRUPT_MASK 0x0c 34 #define IPROC_INTERRUPT_STATUS 0x10 35 #define IPROC_ANALOG_CONTROL 0x1c 36 #define IPROC_CONTROLLER_STATUS 0x14 37 #define IPROC_AUX_DATA 0x20 38 #define IPROC_SOFT_BYPASS_CONTROL 0x38 39 #define IPROC_SOFT_BYPASS_DATA 0x3C 40 41 /* IPROC ADC Channel register offsets */ 42 #define IPROC_ADC_CHANNEL_REGCTL1 0x800 43 #define IPROC_ADC_CHANNEL_REGCTL2 0x804 44 #define IPROC_ADC_CHANNEL_STATUS 0x808 45 #define IPROC_ADC_CHANNEL_INTERRUPT_STATUS 0x80c 46 #define IPROC_ADC_CHANNEL_INTERRUPT_MASK 0x810 47 #define IPROC_ADC_CHANNEL_DATA 0x814 48 #define IPROC_ADC_CHANNEL_OFFSET 0x20 49 50 /* Bit definitions for IPROC_REGCTL2 */ 51 #define IPROC_ADC_AUXIN_SCAN_ENA BIT(0) 52 #define IPROC_ADC_PWR_LDO BIT(5) 53 #define IPROC_ADC_PWR_ADC BIT(4) 54 #define IPROC_ADC_PWR_BG BIT(3) 55 #define IPROC_ADC_CONTROLLER_EN BIT(17) 56 57 /* Bit definitions for IPROC_INTERRUPT_MASK and IPROC_INTERRUPT_STATUS */ 58 #define IPROC_ADC_AUXDATA_RDY_INTR BIT(3) 59 #define IPROC_ADC_INTR 9 60 #define IPROC_ADC_INTR_MASK (0xFF << IPROC_ADC_INTR) 61 62 /* Bit definitions for IPROC_ANALOG_CONTROL */ 63 #define IPROC_ADC_CHANNEL_SEL 11 64 #define IPROC_ADC_CHANNEL_SEL_MASK (0x7 << IPROC_ADC_CHANNEL_SEL) 65 66 /* Bit definitions for IPROC_ADC_CHANNEL_REGCTL1 */ 67 #define IPROC_ADC_CHANNEL_ROUNDS 0x2 68 #define IPROC_ADC_CHANNEL_ROUNDS_MASK (0x3F << IPROC_ADC_CHANNEL_ROUNDS) 69 #define IPROC_ADC_CHANNEL_MODE 0x1 70 #define IPROC_ADC_CHANNEL_MODE_MASK (0x1 << IPROC_ADC_CHANNEL_MODE) 71 #define IPROC_ADC_CHANNEL_MODE_TDM 0x1 72 #define IPROC_ADC_CHANNEL_MODE_SNAPSHOT 0x0 73 #define IPROC_ADC_CHANNEL_ENABLE 0x0 74 #define IPROC_ADC_CHANNEL_ENABLE_MASK 0x1 75 76 /* Bit definitions for IPROC_ADC_CHANNEL_REGCTL2 */ 77 #define IPROC_ADC_CHANNEL_WATERMARK 0x0 78 #define IPROC_ADC_CHANNEL_WATERMARK_MASK \ 79 (0x3F << IPROC_ADC_CHANNEL_WATERMARK) 80 81 #define IPROC_ADC_WATER_MARK_LEVEL 0x1 82 83 /* Bit definitions for IPROC_ADC_CHANNEL_STATUS */ 84 #define IPROC_ADC_CHANNEL_DATA_LOST 0x0 85 #define IPROC_ADC_CHANNEL_DATA_LOST_MASK \ 86 (0x0 << IPROC_ADC_CHANNEL_DATA_LOST) 87 #define IPROC_ADC_CHANNEL_VALID_ENTERIES 0x1 88 #define IPROC_ADC_CHANNEL_VALID_ENTERIES_MASK \ 89 (0xFF << IPROC_ADC_CHANNEL_VALID_ENTERIES) 90 #define IPROC_ADC_CHANNEL_TOTAL_ENTERIES 0x9 91 #define IPROC_ADC_CHANNEL_TOTAL_ENTERIES_MASK \ 92 (0xFF << IPROC_ADC_CHANNEL_TOTAL_ENTERIES) 93 94 /* Bit definitions for IPROC_ADC_CHANNEL_INTERRUPT_MASK */ 95 #define IPROC_ADC_CHANNEL_WTRMRK_INTR 0x0 96 #define IPROC_ADC_CHANNEL_WTRMRK_INTR_MASK \ 97 (0x1 << IPROC_ADC_CHANNEL_WTRMRK_INTR) 98 #define IPROC_ADC_CHANNEL_FULL_INTR 0x1 99 #define IPROC_ADC_CHANNEL_FULL_INTR_MASK \ 100 (0x1 << IPROC_ADC_IPROC_ADC_CHANNEL_FULL_INTR) 101 #define IPROC_ADC_CHANNEL_EMPTY_INTR 0x2 102 #define IPROC_ADC_CHANNEL_EMPTY_INTR_MASK \ 103 (0x1 << IPROC_ADC_CHANNEL_EMPTY_INTR) 104 105 #define IPROC_ADC_WATER_MARK_INTR_ENABLE 0x1 106 107 /* Number of time to retry a set of the interrupt mask reg */ 108 #define IPROC_ADC_INTMASK_RETRY_ATTEMPTS 10 109 110 #define IPROC_ADC_READ_TIMEOUT (HZ*2) 111 112 #define iproc_adc_dbg_reg(dev, priv, reg) \ 113 do { \ 114 u32 val; \ 115 regmap_read(priv->regmap, reg, &val); \ 116 dev_dbg(dev, "%20s= 0x%08x\n", #reg, val); \ 117 } while (0) 118 119 struct iproc_adc_priv { 120 struct regmap *regmap; 121 struct clk *adc_clk; 122 struct mutex mutex; 123 int irqno; 124 int chan_val; 125 int chan_id; 126 struct completion completion; 127 }; 128 129 static void iproc_adc_reg_dump(struct iio_dev *indio_dev) 130 { 131 struct device *dev = &indio_dev->dev; 132 struct iproc_adc_priv *adc_priv = iio_priv(indio_dev); 133 134 iproc_adc_dbg_reg(dev, adc_priv, IPROC_REGCTL1); 135 iproc_adc_dbg_reg(dev, adc_priv, IPROC_REGCTL2); 136 iproc_adc_dbg_reg(dev, adc_priv, IPROC_INTERRUPT_THRES); 137 iproc_adc_dbg_reg(dev, adc_priv, IPROC_INTERRUPT_MASK); 138 iproc_adc_dbg_reg(dev, adc_priv, IPROC_INTERRUPT_STATUS); 139 iproc_adc_dbg_reg(dev, adc_priv, IPROC_CONTROLLER_STATUS); 140 iproc_adc_dbg_reg(dev, adc_priv, IPROC_ANALOG_CONTROL); 141 iproc_adc_dbg_reg(dev, adc_priv, IPROC_AUX_DATA); 142 iproc_adc_dbg_reg(dev, adc_priv, IPROC_SOFT_BYPASS_CONTROL); 143 iproc_adc_dbg_reg(dev, adc_priv, IPROC_SOFT_BYPASS_DATA); 144 } 145 146 static irqreturn_t iproc_adc_interrupt_handler(int irq, void *data) 147 { 148 u32 channel_intr_status; 149 u32 intr_status; 150 u32 intr_mask; 151 struct iio_dev *indio_dev = data; 152 struct iproc_adc_priv *adc_priv = iio_priv(indio_dev); 153 154 /* 155 * This interrupt is shared with the touchscreen driver. 156 * Make sure this interrupt is intended for us. 157 * Handle only ADC channel specific interrupts. 158 */ 159 regmap_read(adc_priv->regmap, IPROC_INTERRUPT_STATUS, &intr_status); 160 regmap_read(adc_priv->regmap, IPROC_INTERRUPT_MASK, &intr_mask); 161 intr_status = intr_status & intr_mask; 162 channel_intr_status = (intr_status & IPROC_ADC_INTR_MASK) >> 163 IPROC_ADC_INTR; 164 if (channel_intr_status) 165 return IRQ_WAKE_THREAD; 166 167 return IRQ_NONE; 168 } 169 170 static irqreturn_t iproc_adc_interrupt_thread(int irq, void *data) 171 { 172 irqreturn_t retval = IRQ_NONE; 173 struct iproc_adc_priv *adc_priv; 174 struct iio_dev *indio_dev = data; 175 unsigned int valid_entries; 176 u32 intr_status; 177 u32 intr_channels; 178 u32 channel_status; 179 u32 ch_intr_status; 180 181 adc_priv = iio_priv(indio_dev); 182 183 regmap_read(adc_priv->regmap, IPROC_INTERRUPT_STATUS, &intr_status); 184 dev_dbg(&indio_dev->dev, "iproc_adc_interrupt_thread(),INTRPT_STS:%x\n", 185 intr_status); 186 187 intr_channels = (intr_status & IPROC_ADC_INTR_MASK) >> IPROC_ADC_INTR; 188 if (intr_channels) { 189 regmap_read(adc_priv->regmap, 190 IPROC_ADC_CHANNEL_INTERRUPT_STATUS + 191 IPROC_ADC_CHANNEL_OFFSET * adc_priv->chan_id, 192 &ch_intr_status); 193 194 if (ch_intr_status & IPROC_ADC_CHANNEL_WTRMRK_INTR_MASK) { 195 regmap_read(adc_priv->regmap, 196 IPROC_ADC_CHANNEL_STATUS + 197 IPROC_ADC_CHANNEL_OFFSET * 198 adc_priv->chan_id, 199 &channel_status); 200 201 valid_entries = ((channel_status & 202 IPROC_ADC_CHANNEL_VALID_ENTERIES_MASK) >> 203 IPROC_ADC_CHANNEL_VALID_ENTERIES); 204 if (valid_entries >= 1) { 205 regmap_read(adc_priv->regmap, 206 IPROC_ADC_CHANNEL_DATA + 207 IPROC_ADC_CHANNEL_OFFSET * 208 adc_priv->chan_id, 209 &adc_priv->chan_val); 210 complete(&adc_priv->completion); 211 } else { 212 dev_err(&indio_dev->dev, 213 "No data rcvd on channel %d\n", 214 adc_priv->chan_id); 215 } 216 regmap_write(adc_priv->regmap, 217 IPROC_ADC_CHANNEL_INTERRUPT_MASK + 218 IPROC_ADC_CHANNEL_OFFSET * 219 adc_priv->chan_id, 220 (ch_intr_status & 221 ~(IPROC_ADC_CHANNEL_WTRMRK_INTR_MASK))); 222 } 223 regmap_write(adc_priv->regmap, 224 IPROC_ADC_CHANNEL_INTERRUPT_STATUS + 225 IPROC_ADC_CHANNEL_OFFSET * adc_priv->chan_id, 226 ch_intr_status); 227 regmap_write(adc_priv->regmap, IPROC_INTERRUPT_STATUS, 228 intr_channels); 229 retval = IRQ_HANDLED; 230 } 231 232 return retval; 233 } 234 235 static int iproc_adc_do_read(struct iio_dev *indio_dev, 236 int channel, 237 u16 *p_adc_data) 238 { 239 int read_len = 0; 240 u32 val; 241 u32 mask; 242 u32 val_check; 243 int failed_cnt = 0; 244 struct iproc_adc_priv *adc_priv = iio_priv(indio_dev); 245 246 mutex_lock(&adc_priv->mutex); 247 248 /* 249 * After a read is complete the ADC interrupts will be disabled so 250 * we can assume this section of code is safe from interrupts. 251 */ 252 adc_priv->chan_val = -1; 253 adc_priv->chan_id = channel; 254 255 reinit_completion(&adc_priv->completion); 256 /* Clear any pending interrupt */ 257 regmap_update_bits(adc_priv->regmap, IPROC_INTERRUPT_STATUS, 258 IPROC_ADC_INTR_MASK | IPROC_ADC_AUXDATA_RDY_INTR, 259 ((0x0 << channel) << IPROC_ADC_INTR) | 260 IPROC_ADC_AUXDATA_RDY_INTR); 261 262 /* Configure channel for snapshot mode and enable */ 263 val = (BIT(IPROC_ADC_CHANNEL_ROUNDS) | 264 (IPROC_ADC_CHANNEL_MODE_SNAPSHOT << IPROC_ADC_CHANNEL_MODE) | 265 (0x1 << IPROC_ADC_CHANNEL_ENABLE)); 266 267 mask = IPROC_ADC_CHANNEL_ROUNDS_MASK | IPROC_ADC_CHANNEL_MODE_MASK | 268 IPROC_ADC_CHANNEL_ENABLE_MASK; 269 regmap_update_bits(adc_priv->regmap, (IPROC_ADC_CHANNEL_REGCTL1 + 270 IPROC_ADC_CHANNEL_OFFSET * channel), 271 mask, val); 272 273 /* Set the Watermark for a channel */ 274 regmap_update_bits(adc_priv->regmap, (IPROC_ADC_CHANNEL_REGCTL2 + 275 IPROC_ADC_CHANNEL_OFFSET * channel), 276 IPROC_ADC_CHANNEL_WATERMARK_MASK, 277 0x1); 278 279 /* Enable water mark interrupt */ 280 regmap_update_bits(adc_priv->regmap, (IPROC_ADC_CHANNEL_INTERRUPT_MASK + 281 IPROC_ADC_CHANNEL_OFFSET * 282 channel), 283 IPROC_ADC_CHANNEL_WTRMRK_INTR_MASK, 284 IPROC_ADC_WATER_MARK_INTR_ENABLE); 285 regmap_read(adc_priv->regmap, IPROC_INTERRUPT_MASK, &val); 286 287 /* Enable ADC interrupt for a channel */ 288 val |= (BIT(channel) << IPROC_ADC_INTR); 289 regmap_write(adc_priv->regmap, IPROC_INTERRUPT_MASK, val); 290 291 /* 292 * There seems to be a very rare issue where writing to this register 293 * does not take effect. To work around the issue we will try multiple 294 * writes. In total we will spend about 10*10 = 100 us attempting this. 295 * Testing has shown that this may loop a few time, but we have never 296 * hit the full count. 297 */ 298 regmap_read(adc_priv->regmap, IPROC_INTERRUPT_MASK, &val_check); 299 while (val_check != val) { 300 failed_cnt++; 301 302 if (failed_cnt > IPROC_ADC_INTMASK_RETRY_ATTEMPTS) 303 break; 304 305 udelay(10); 306 regmap_update_bits(adc_priv->regmap, IPROC_INTERRUPT_MASK, 307 IPROC_ADC_INTR_MASK, 308 ((0x1 << channel) << 309 IPROC_ADC_INTR)); 310 311 regmap_read(adc_priv->regmap, IPROC_INTERRUPT_MASK, &val_check); 312 } 313 314 if (failed_cnt) { 315 dev_dbg(&indio_dev->dev, 316 "IntMask failed (%d times)", failed_cnt); 317 if (failed_cnt > IPROC_ADC_INTMASK_RETRY_ATTEMPTS) { 318 dev_err(&indio_dev->dev, 319 "IntMask set failed. Read will likely fail."); 320 read_len = -EIO; 321 goto adc_err; 322 }; 323 } 324 regmap_read(adc_priv->regmap, IPROC_INTERRUPT_MASK, &val_check); 325 326 if (wait_for_completion_timeout(&adc_priv->completion, 327 IPROC_ADC_READ_TIMEOUT) > 0) { 328 329 /* Only the lower 16 bits are relevant */ 330 *p_adc_data = adc_priv->chan_val & 0xFFFF; 331 read_len = sizeof(*p_adc_data); 332 333 } else { 334 /* 335 * We never got the interrupt, something went wrong. 336 * Perhaps the interrupt may still be coming, we do not want 337 * that now. Lets disable the ADC interrupt, and clear the 338 * status to put it back in to normal state. 339 */ 340 read_len = -ETIMEDOUT; 341 goto adc_err; 342 } 343 mutex_unlock(&adc_priv->mutex); 344 345 return read_len; 346 347 adc_err: 348 regmap_update_bits(adc_priv->regmap, IPROC_INTERRUPT_MASK, 349 IPROC_ADC_INTR_MASK, 350 ((0x0 << channel) << IPROC_ADC_INTR)); 351 352 regmap_update_bits(adc_priv->regmap, IPROC_INTERRUPT_STATUS, 353 IPROC_ADC_INTR_MASK, 354 ((0x0 << channel) << IPROC_ADC_INTR)); 355 356 dev_err(&indio_dev->dev, "Timed out waiting for ADC data!\n"); 357 iproc_adc_reg_dump(indio_dev); 358 mutex_unlock(&adc_priv->mutex); 359 360 return read_len; 361 } 362 363 static int iproc_adc_enable(struct iio_dev *indio_dev) 364 { 365 u32 val; 366 u32 channel_id; 367 struct iproc_adc_priv *adc_priv = iio_priv(indio_dev); 368 int ret; 369 370 /* Set i_amux = 3b'000, select channel 0 */ 371 ret = regmap_update_bits(adc_priv->regmap, IPROC_ANALOG_CONTROL, 372 IPROC_ADC_CHANNEL_SEL_MASK, 0); 373 if (ret) { 374 dev_err(&indio_dev->dev, 375 "failed to write IPROC_ANALOG_CONTROL %d\n", ret); 376 return ret; 377 } 378 adc_priv->chan_val = -1; 379 380 /* 381 * PWR up LDO, ADC, and Band Gap (0 to enable) 382 * Also enable ADC controller (set high) 383 */ 384 ret = regmap_read(adc_priv->regmap, IPROC_REGCTL2, &val); 385 if (ret) { 386 dev_err(&indio_dev->dev, 387 "failed to read IPROC_REGCTL2 %d\n", ret); 388 return ret; 389 } 390 391 val &= ~(IPROC_ADC_PWR_LDO | IPROC_ADC_PWR_ADC | IPROC_ADC_PWR_BG); 392 393 ret = regmap_write(adc_priv->regmap, IPROC_REGCTL2, val); 394 if (ret) { 395 dev_err(&indio_dev->dev, 396 "failed to write IPROC_REGCTL2 %d\n", ret); 397 return ret; 398 } 399 400 ret = regmap_read(adc_priv->regmap, IPROC_REGCTL2, &val); 401 if (ret) { 402 dev_err(&indio_dev->dev, 403 "failed to read IPROC_REGCTL2 %d\n", ret); 404 return ret; 405 } 406 407 val |= IPROC_ADC_CONTROLLER_EN; 408 ret = regmap_write(adc_priv->regmap, IPROC_REGCTL2, val); 409 if (ret) { 410 dev_err(&indio_dev->dev, 411 "failed to write IPROC_REGCTL2 %d\n", ret); 412 return ret; 413 } 414 415 for (channel_id = 0; channel_id < indio_dev->num_channels; 416 channel_id++) { 417 ret = regmap_write(adc_priv->regmap, 418 IPROC_ADC_CHANNEL_INTERRUPT_MASK + 419 IPROC_ADC_CHANNEL_OFFSET * channel_id, 0); 420 if (ret) { 421 dev_err(&indio_dev->dev, 422 "failed to write ADC_CHANNEL_INTERRUPT_MASK %d\n", 423 ret); 424 return ret; 425 } 426 427 ret = regmap_write(adc_priv->regmap, 428 IPROC_ADC_CHANNEL_INTERRUPT_STATUS + 429 IPROC_ADC_CHANNEL_OFFSET * channel_id, 0); 430 if (ret) { 431 dev_err(&indio_dev->dev, 432 "failed to write ADC_CHANNEL_INTERRUPT_STATUS %d\n", 433 ret); 434 return ret; 435 } 436 } 437 438 return 0; 439 } 440 441 static void iproc_adc_disable(struct iio_dev *indio_dev) 442 { 443 u32 val; 444 int ret; 445 struct iproc_adc_priv *adc_priv = iio_priv(indio_dev); 446 447 ret = regmap_read(adc_priv->regmap, IPROC_REGCTL2, &val); 448 if (ret) { 449 dev_err(&indio_dev->dev, 450 "failed to read IPROC_REGCTL2 %d\n", ret); 451 return; 452 } 453 454 val &= ~IPROC_ADC_CONTROLLER_EN; 455 ret = regmap_write(adc_priv->regmap, IPROC_REGCTL2, val); 456 if (ret) { 457 dev_err(&indio_dev->dev, 458 "failed to write IPROC_REGCTL2 %d\n", ret); 459 return; 460 } 461 } 462 463 static int iproc_adc_read_raw(struct iio_dev *indio_dev, 464 struct iio_chan_spec const *chan, 465 int *val, 466 int *val2, 467 long mask) 468 { 469 u16 adc_data; 470 int err; 471 472 switch (mask) { 473 case IIO_CHAN_INFO_RAW: 474 err = iproc_adc_do_read(indio_dev, chan->channel, &adc_data); 475 if (err < 0) 476 return err; 477 *val = adc_data; 478 return IIO_VAL_INT; 479 case IIO_CHAN_INFO_SCALE: 480 switch (chan->type) { 481 case IIO_VOLTAGE: 482 *val = 1800; 483 *val2 = 10; 484 return IIO_VAL_FRACTIONAL_LOG2; 485 default: 486 return -EINVAL; 487 } 488 default: 489 return -EINVAL; 490 } 491 } 492 493 static const struct iio_info iproc_adc_iio_info = { 494 .read_raw = &iproc_adc_read_raw, 495 .driver_module = THIS_MODULE, 496 }; 497 498 #define IPROC_ADC_CHANNEL(_index, _id) { \ 499 .type = IIO_VOLTAGE, \ 500 .indexed = 1, \ 501 .channel = _index, \ 502 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 503 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ 504 .datasheet_name = _id, \ 505 } 506 507 static const struct iio_chan_spec iproc_adc_iio_channels[] = { 508 IPROC_ADC_CHANNEL(0, "adc0"), 509 IPROC_ADC_CHANNEL(1, "adc1"), 510 IPROC_ADC_CHANNEL(2, "adc2"), 511 IPROC_ADC_CHANNEL(3, "adc3"), 512 IPROC_ADC_CHANNEL(4, "adc4"), 513 IPROC_ADC_CHANNEL(5, "adc5"), 514 IPROC_ADC_CHANNEL(6, "adc6"), 515 IPROC_ADC_CHANNEL(7, "adc7"), 516 }; 517 518 static int iproc_adc_probe(struct platform_device *pdev) 519 { 520 struct iproc_adc_priv *adc_priv; 521 struct iio_dev *indio_dev = NULL; 522 int ret; 523 524 indio_dev = devm_iio_device_alloc(&pdev->dev, 525 sizeof(*adc_priv)); 526 if (!indio_dev) { 527 dev_err(&pdev->dev, "failed to allocate iio device\n"); 528 return -ENOMEM; 529 } 530 531 adc_priv = iio_priv(indio_dev); 532 platform_set_drvdata(pdev, indio_dev); 533 534 mutex_init(&adc_priv->mutex); 535 536 init_completion(&adc_priv->completion); 537 538 adc_priv->regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, 539 "adc-syscon"); 540 if (IS_ERR(adc_priv->regmap)) { 541 dev_err(&pdev->dev, "failed to get handle for tsc syscon\n"); 542 ret = PTR_ERR(adc_priv->regmap); 543 return ret; 544 } 545 546 adc_priv->adc_clk = devm_clk_get(&pdev->dev, "tsc_clk"); 547 if (IS_ERR(adc_priv->adc_clk)) { 548 dev_err(&pdev->dev, 549 "failed getting clock tsc_clk\n"); 550 ret = PTR_ERR(adc_priv->adc_clk); 551 return ret; 552 } 553 554 adc_priv->irqno = platform_get_irq(pdev, 0); 555 if (adc_priv->irqno <= 0) { 556 dev_err(&pdev->dev, "platform_get_irq failed\n"); 557 ret = -ENODEV; 558 return ret; 559 } 560 561 ret = regmap_update_bits(adc_priv->regmap, IPROC_REGCTL2, 562 IPROC_ADC_AUXIN_SCAN_ENA, 0); 563 if (ret) { 564 dev_err(&pdev->dev, "failed to write IPROC_REGCTL2 %d\n", ret); 565 return ret; 566 } 567 568 ret = devm_request_threaded_irq(&pdev->dev, adc_priv->irqno, 569 iproc_adc_interrupt_thread, 570 iproc_adc_interrupt_handler, 571 IRQF_SHARED, "iproc-adc", indio_dev); 572 if (ret) { 573 dev_err(&pdev->dev, "request_irq error %d\n", ret); 574 return ret; 575 } 576 577 ret = clk_prepare_enable(adc_priv->adc_clk); 578 if (ret) { 579 dev_err(&pdev->dev, 580 "clk_prepare_enable failed %d\n", ret); 581 return ret; 582 } 583 584 ret = iproc_adc_enable(indio_dev); 585 if (ret) { 586 dev_err(&pdev->dev, "failed to enable adc %d\n", ret); 587 goto err_adc_enable; 588 } 589 590 indio_dev->name = "iproc-static-adc"; 591 indio_dev->dev.parent = &pdev->dev; 592 indio_dev->dev.of_node = pdev->dev.of_node; 593 indio_dev->info = &iproc_adc_iio_info; 594 indio_dev->modes = INDIO_DIRECT_MODE; 595 indio_dev->channels = iproc_adc_iio_channels; 596 indio_dev->num_channels = ARRAY_SIZE(iproc_adc_iio_channels); 597 598 ret = iio_device_register(indio_dev); 599 if (ret) { 600 dev_err(&pdev->dev, "iio_device_register failed:err %d\n", ret); 601 goto err_clk; 602 } 603 604 return 0; 605 606 err_clk: 607 iproc_adc_disable(indio_dev); 608 err_adc_enable: 609 clk_disable_unprepare(adc_priv->adc_clk); 610 611 return ret; 612 } 613 614 static int iproc_adc_remove(struct platform_device *pdev) 615 { 616 struct iio_dev *indio_dev = platform_get_drvdata(pdev); 617 struct iproc_adc_priv *adc_priv = iio_priv(indio_dev); 618 619 iio_device_unregister(indio_dev); 620 iproc_adc_disable(indio_dev); 621 clk_disable_unprepare(adc_priv->adc_clk); 622 623 return 0; 624 } 625 626 static const struct of_device_id iproc_adc_of_match[] = { 627 {.compatible = "brcm,iproc-static-adc", }, 628 { }, 629 }; 630 MODULE_DEVICE_TABLE(of, iproc_adc_of_match); 631 632 static struct platform_driver iproc_adc_driver = { 633 .probe = iproc_adc_probe, 634 .remove = iproc_adc_remove, 635 .driver = { 636 .name = "iproc-static-adc", 637 .of_match_table = of_match_ptr(iproc_adc_of_match), 638 }, 639 }; 640 module_platform_driver(iproc_adc_driver); 641 642 MODULE_DESCRIPTION("Broadcom iProc ADC controller driver"); 643 MODULE_AUTHOR("Raveendra Padasalagi <raveendra.padasalagi@broadcom.com>"); 644 MODULE_LICENSE("GPL v2"); 645