drivers/iio/adc/ti_am335x_adc.c

   1 /*
   2  * TI ADC MFD driver
   3  *
   4  * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation version 2.
   9  *
  10  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  11  * kind, whether express or implied; without even the implied warranty
  12  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/err.h>
  18 #include <linux/module.h>
  19 #include <linux/slab.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/io.h>
  23 #include <linux/iio/iio.h>
  24 #include <linux/of.h>
  25 #include <linux/of_device.h>
  26 #include <linux/iio/machine.h>
  27 #include <linux/iio/driver.h>
  28
  29 #include <linux/mfd/ti_am335x_tscadc.h>
  30 #include <linux/iio/buffer.h>
  31 #include <linux/iio/kfifo_buf.h>
  32
  33 struct tiadc_device {
  34         struct ti_tscadc_dev *mfd_tscadc;
  35         struct mutex fifo1_lock; /* to protect fifo access */
  36         int channels;
  37         u8 channel_line[8];
  38         u8 channel_step[8];
  39         int buffer_en_ch_steps;
  40         u16 data[8];
  41         u32 open_delay[8], sample_delay[8], step_avg[8];
  42 };
  43
  44 static unsigned int tiadc_readl(struct tiadc_device *adc, unsigned int reg)
  45 {
  46         return readl(adc->mfd_tscadc->tscadc_base + reg);
  47 }
  48
  49 static void tiadc_writel(struct tiadc_device *adc, unsigned int reg,
  50                                         unsigned int val)
  51 {
  52         writel(val, adc->mfd_tscadc->tscadc_base + reg);
  53 }
  54
  55 static u32 get_adc_step_mask(struct tiadc_device *adc_dev)
  56 {
  57         u32 step_en;
  58
  59         step_en = ((1 << adc_dev->channels) - 1);
  60         step_en <<= TOTAL_STEPS - adc_dev->channels + 1;
  61         return step_en;
  62 }
  63
  64 static u32 get_adc_chan_step_mask(struct tiadc_device *adc_dev,
  65                 struct iio_chan_spec const *chan)
  66 {
  67         int i;
  68
  69         for (i = 0; i < ARRAY_SIZE(adc_dev->channel_step); i++) {
  70                 if (chan->channel == adc_dev->channel_line[i]) {
  71                         u32 step;
  72
  73                         step = adc_dev->channel_step[i];
  74                         /* +1 for the charger */
  75                         return 1 << (step + 1);
  76                 }
  77         }
  78         WARN_ON(1);
  79         return 0;
  80 }
  81
  82 static u32 get_adc_step_bit(struct tiadc_device *adc_dev, int chan)
  83 {
  84         return 1 << adc_dev->channel_step[chan];
  85 }
  86
  87 static void tiadc_step_config(struct iio_dev *indio_dev)
  88 {
  89         struct tiadc_device *adc_dev = iio_priv(indio_dev);
  90         struct device *dev = adc_dev->mfd_tscadc->dev;
  91         unsigned int stepconfig;
  92         int i, steps = 0;
  93
  94         /*
  95          * There are 16 configurable steps and 8 analog input
  96          * lines available which are shared between Touchscreen and ADC.
  97          *
  98          * Steps forwards i.e. from 0 towards 16 are used by ADC
  99          * depending on number of input lines needed.
 100          * Channel would represent which analog input
 101          * needs to be given to ADC to digitalize data.
 102          */
 103
 104
 105         for (i = 0; i < adc_dev->channels; i++) {
 106                 int chan;
 107
 108                 chan = adc_dev->channel_line[i];
 109
 110                 if (adc_dev->step_avg[i] > STEPCONFIG_AVG_16) {
 111                         dev_warn(dev, "chan %d step_avg truncating to %d\n",
 112                                  chan, STEPCONFIG_AVG_16);
 113                         adc_dev->step_avg[i] = STEPCONFIG_AVG_16;
 114                 }
 115
 116                 if (adc_dev->step_avg[i])
 117                         stepconfig =
 118                         STEPCONFIG_AVG(ffs(adc_dev->step_avg[i]) - 1) |
 119                         STEPCONFIG_FIFO1;
 120                 else
 121                         stepconfig = STEPCONFIG_FIFO1;
 122
 123                 if (iio_buffer_enabled(indio_dev))
 124                         stepconfig |= STEPCONFIG_MODE_SWCNT;
 125
 126                 tiadc_writel(adc_dev, REG_STEPCONFIG(steps),
 127                                 stepconfig | STEPCONFIG_INP(chan));
 128
 129                 if (adc_dev->open_delay[i] > STEPDELAY_OPEN_MASK) {
 130                         dev_warn(dev, "chan %d open delay truncating to 0x3FFFF\n",
 131                                  chan);
 132                         adc_dev->open_delay[i] = STEPDELAY_OPEN_MASK;
 133                 }
 134
 135                 if (adc_dev->sample_delay[i] > 0xFF) {
 136                         dev_warn(dev, "chan %d sample delay truncating to 0xFF\n",
 137                                  chan);
 138                         adc_dev->sample_delay[i] = 0xFF;
 139                 }
 140
 141                 tiadc_writel(adc_dev, REG_STEPDELAY(steps),
 142                                 STEPDELAY_OPEN(adc_dev->open_delay[i]) |
 143                                 STEPDELAY_SAMPLE(adc_dev->sample_delay[i]));
 144
 145                 adc_dev->channel_step[i] = steps;
 146                 steps++;
 147         }
 148 }
 149
 150 static irqreturn_t tiadc_irq_h(int irq, void *private)
 151 {
 152         struct iio_dev *indio_dev = private;
 153         struct tiadc_device *adc_dev = iio_priv(indio_dev);
 154         unsigned int status, config, adc_fsm;
 155         unsigned short count = 0;
 156
 157         status = tiadc_readl(adc_dev, REG_IRQSTATUS);
 158
 159         /*
 160          * ADC and touchscreen share the IRQ line.
 161          * FIFO0 interrupts are used by TSC. Handle FIFO1 IRQs here only
 162          */
 163         if (status & IRQENB_FIFO1OVRRUN) {
 164                 /* FIFO Overrun. Clear flag. Disable/Enable ADC to recover */
 165                 config = tiadc_readl(adc_dev, REG_CTRL);
 166                 config &= ~(CNTRLREG_TSCSSENB);
 167                 tiadc_writel(adc_dev, REG_CTRL, config);
 168                 tiadc_writel(adc_dev, REG_IRQSTATUS, IRQENB_FIFO1OVRRUN
 169                                 | IRQENB_FIFO1UNDRFLW | IRQENB_FIFO1THRES);
 170
 171                 /* wait for idle state.
 172                  * ADC needs to finish the current conversion
 173                  * before disabling the module
 174                  */
 175                 do {
 176                         adc_fsm = tiadc_readl(adc_dev, REG_ADCFSM);
 177                 } while (adc_fsm != 0x10 && count++ < 100);
 178
 179                 tiadc_writel(adc_dev, REG_CTRL, (config | CNTRLREG_TSCSSENB));
 180                 return IRQ_HANDLED;
 181         } else if (status & IRQENB_FIFO1THRES) {
 182                 /* Disable irq and wake worker thread */
 183                 tiadc_writel(adc_dev, REG_IRQCLR, IRQENB_FIFO1THRES);
 184                 return IRQ_WAKE_THREAD;
 185         }
 186
 187         return IRQ_NONE;
 188 }
 189
 190 static irqreturn_t tiadc_worker_h(int irq, void *private)
 191 {
 192         struct iio_dev *indio_dev = private;
 193         struct tiadc_device *adc_dev = iio_priv(indio_dev);
 194         int i, k, fifo1count, read;
 195         u16 *data = adc_dev->data;
 196
 197         fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT);
 198         for (k = 0; k < fifo1count; k = k + i) {
 199                 for (i = 0; i < (indio_dev->scan_bytes)/2; i++) {
 200                         read = tiadc_readl(adc_dev, REG_FIFO1);
 201                         data[i] = read & FIFOREAD_DATA_MASK;
 202                 }
 203                 iio_push_to_buffers(indio_dev, (u8 *) data);
 204         }
 205
 206         tiadc_writel(adc_dev, REG_IRQSTATUS, IRQENB_FIFO1THRES);
 207         tiadc_writel(adc_dev, REG_IRQENABLE, IRQENB_FIFO1THRES);
 208
 209         return IRQ_HANDLED;
 210 }
 211
 212 static int tiadc_buffer_preenable(struct iio_dev *indio_dev)
 213 {
 214         struct tiadc_device *adc_dev = iio_priv(indio_dev);
 215         int i, fifo1count, read;
 216
 217         tiadc_writel(adc_dev, REG_IRQCLR, (IRQENB_FIFO1THRES |
 218                                 IRQENB_FIFO1OVRRUN |
 219                                 IRQENB_FIFO1UNDRFLW));
 220
 221         /* Flush FIFO. Needed in corner cases in simultaneous tsc/adc use */
 222         fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT);
 223         for (i = 0; i < fifo1count; i++)
 224                 read = tiadc_readl(adc_dev, REG_FIFO1);
 225
 226         return 0;
 227 }
 228
 229 static int tiadc_buffer_postenable(struct iio_dev *indio_dev)
 230 {
 231         struct tiadc_device *adc_dev = iio_priv(indio_dev);
 232         unsigned int enb = 0;
 233         u8 bit;
 234
 235         tiadc_step_config(indio_dev);
 236         for_each_set_bit(bit, indio_dev->active_scan_mask, adc_dev->channels)
 237                 enb |= (get_adc_step_bit(adc_dev, bit) << 1);
 238         adc_dev->buffer_en_ch_steps = enb;
 239
 240         am335x_tsc_se_set_cache(adc_dev->mfd_tscadc, enb);
 241
 242         tiadc_writel(adc_dev,  REG_IRQSTATUS, IRQENB_FIFO1THRES
 243                                 | IRQENB_FIFO1OVRRUN | IRQENB_FIFO1UNDRFLW);
 244         tiadc_writel(adc_dev,  REG_IRQENABLE, IRQENB_FIFO1THRES
 245                                 | IRQENB_FIFO1OVRRUN);
 246
 247         return 0;
 248 }
 249
 250 static int tiadc_buffer_predisable(struct iio_dev *indio_dev)
 251 {
 252         struct tiadc_device *adc_dev = iio_priv(indio_dev);
 253         int fifo1count, i, read;
 254
 255         tiadc_writel(adc_dev, REG_IRQCLR, (IRQENB_FIFO1THRES |
 256                                 IRQENB_FIFO1OVRRUN | IRQENB_FIFO1UNDRFLW));
 257         am335x_tsc_se_clr(adc_dev->mfd_tscadc, adc_dev->buffer_en_ch_steps);
 258         adc_dev->buffer_en_ch_steps = 0;
 259
 260         /* Flush FIFO of leftover data in the time it takes to disable adc */
 261         fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT);
 262         for (i = 0; i < fifo1count; i++)
 263                 read = tiadc_readl(adc_dev, REG_FIFO1);
 264
 265         return 0;
 266 }
 267
 268 static int tiadc_buffer_postdisable(struct iio_dev *indio_dev)
 269 {
 270         tiadc_step_config(indio_dev);
 271
 272         return 0;
 273 }
 274
 275 static const struct iio_buffer_setup_ops tiadc_buffer_setup_ops = {
 276         .preenable = &tiadc_buffer_preenable,
 277         .postenable = &tiadc_buffer_postenable,
 278         .predisable = &tiadc_buffer_predisable,
 279         .postdisable = &tiadc_buffer_postdisable,
 280 };
 281
 282 static int tiadc_iio_buffered_hardware_setup(struct iio_dev *indio_dev,
 283         irqreturn_t (*pollfunc_bh)(int irq, void *p),
 284         irqreturn_t (*pollfunc_th)(int irq, void *p),
 285         int irq,
 286         unsigned long flags,
 287         const struct iio_buffer_setup_ops *setup_ops)
 288 {
 289         struct iio_buffer *buffer;
 290         int ret;
 291
 292         buffer = iio_kfifo_allocate();
 293         if (!buffer)
 294                 return -ENOMEM;
 295
 296         iio_device_attach_buffer(indio_dev, buffer);
 297
 298         ret = request_threaded_irq(irq, pollfunc_th, pollfunc_bh,
 299                                 flags, indio_dev->name, indio_dev);
 300         if (ret)
 301                 goto error_kfifo_free;
 302
 303         indio_dev->setup_ops = setup_ops;
 304         indio_dev->modes |= INDIO_BUFFER_SOFTWARE;
 305
 306         return 0;
 307
 308 error_kfifo_free:
 309         iio_kfifo_free(indio_dev->buffer);
 310         return ret;
 311 }
 312
 313 static void tiadc_iio_buffered_hardware_remove(struct iio_dev *indio_dev)
 314 {
 315         struct tiadc_device *adc_dev = iio_priv(indio_dev);
 316
 317         free_irq(adc_dev->mfd_tscadc->irq, indio_dev);
 318         iio_kfifo_free(indio_dev->buffer);
 319 }
 320
 321
 322 static const char * const chan_name_ain[] = {
 323         "AIN0",
 324         "AIN1",
 325         "AIN2",
 326         "AIN3",
 327         "AIN4",
 328         "AIN5",
 329         "AIN6",
 330         "AIN7",
 331 };
 332
 333 static int tiadc_channel_init(struct iio_dev *indio_dev, int channels)
 334 {
 335         struct tiadc_device *adc_dev = iio_priv(indio_dev);
 336         struct iio_chan_spec *chan_array;
 337         struct iio_chan_spec *chan;
 338         int i;
 339
 340         indio_dev->num_channels = channels;
 341         chan_array = kcalloc(channels,
 342                         sizeof(struct iio_chan_spec), GFP_KERNEL);
 343         if (chan_array == NULL)
 344                 return -ENOMEM;
 345
 346         chan = chan_array;
 347         for (i = 0; i < channels; i++, chan++) {
 348
 349                 chan->type = IIO_VOLTAGE;
 350                 chan->indexed = 1;
 351                 chan->channel = adc_dev->channel_line[i];
 352                 chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
 353                 chan->datasheet_name = chan_name_ain[chan->channel];
 354                 chan->scan_index = i;
 355                 chan->scan_type.sign = 'u';
 356                 chan->scan_type.realbits = 12;
 357                 chan->scan_type.storagebits = 16;
 358         }
 359
 360         indio_dev->channels = chan_array;
 361
 362         return 0;
 363 }
 364
 365 static void tiadc_channels_remove(struct iio_dev *indio_dev)
 366 {
 367         kfree(indio_dev->channels);
 368 }
 369
 370 static int tiadc_read_raw(struct iio_dev *indio_dev,
 371                 struct iio_chan_spec const *chan,
 372                 int *val, int *val2, long mask)
 373 {
 374         struct tiadc_device *adc_dev = iio_priv(indio_dev);
 375         int ret = IIO_VAL_INT;
 376         int i, map_val;
 377         unsigned int fifo1count, read, stepid;
 378         bool found = false;
 379         u32 step_en;
 380         unsigned long timeout;
 381
 382         if (iio_buffer_enabled(indio_dev))
 383                 return -EBUSY;
 384
 385         step_en = get_adc_chan_step_mask(adc_dev, chan);
 386         if (!step_en)
 387                 return -EINVAL;
 388
 389         mutex_lock(&adc_dev->fifo1_lock);
 390         fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT);
 391         while (fifo1count--)
 392                 tiadc_readl(adc_dev, REG_FIFO1);
 393
 394         am335x_tsc_se_set_once(adc_dev->mfd_tscadc, step_en);
 395
 396         timeout = jiffies + msecs_to_jiffies
 397                                 (IDLE_TIMEOUT * adc_dev->channels);
 398         /* Wait for Fifo threshold interrupt */
 399         while (1) {
 400                 fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT);
 401                 if (fifo1count)
 402                         break;
 403
 404                 if (time_after(jiffies, timeout)) {
 405                         am335x_tsc_se_adc_done(adc_dev->mfd_tscadc);
 406                         ret = -EAGAIN;
 407                         goto err_unlock;
 408                 }
 409         }
 410         map_val = adc_dev->channel_step[chan->scan_index];
 411
 412         /*
 413          * We check the complete FIFO. We programmed just one entry but in case
 414          * something went wrong we left empty handed (-EAGAIN previously) and
 415          * then the value apeared somehow in the FIFO we would have two entries.
 416          * Therefore we read every item and keep only the latest version of the
 417          * requested channel.
 418          */
 419         for (i = 0; i < fifo1count; i++) {
 420                 read = tiadc_readl(adc_dev, REG_FIFO1);
 421                 stepid = read & FIFOREAD_CHNLID_MASK;
 422                 stepid = stepid >> 0x10;
 423
 424                 if (stepid == map_val) {
 425                         read = read & FIFOREAD_DATA_MASK;
 426                         found = true;
 427                         *val = (u16) read;
 428                 }
 429         }
 430         am335x_tsc_se_adc_done(adc_dev->mfd_tscadc);
 431
 432         if (found == false)
 433                 ret =  -EBUSY;
 434
 435 err_unlock:
 436         mutex_unlock(&adc_dev->fifo1_lock);
 437         return ret;
 438 }
 439
 440 static const struct iio_info tiadc_info = {
 441         .read_raw = &tiadc_read_raw,
 442         .driver_module = THIS_MODULE,
 443 };
 444
 445 static int tiadc_parse_dt(struct platform_device *pdev,
 446                           struct tiadc_device *adc_dev)
 447 {
 448         struct device_node *node = pdev->dev.of_node;
 449         struct property *prop;
 450         const __be32 *cur;
 451         int channels = 0;
 452         u32 val;
 453
 454         of_property_for_each_u32(node, "ti,adc-channels", prop, cur, val) {
 455                 adc_dev->channel_line[channels] = val;
 456
 457                 /* Set Default values for optional DT parameters */
 458                 adc_dev->open_delay[channels] = STEPCONFIG_OPENDLY;
 459                 adc_dev->sample_delay[channels] = STEPCONFIG_SAMPLEDLY;
 460                 adc_dev->step_avg[channels] = 16;
 461
 462                 channels++;
 463         }
 464
 465         of_property_read_u32_array(node, "ti,chan-step-avg",
 466                                    adc_dev->step_avg, channels);
 467         of_property_read_u32_array(node, "ti,chan-step-opendelay",
 468                                    adc_dev->open_delay, channels);
 469         of_property_read_u32_array(node, "ti,chan-step-sampledelay",
 470                                    adc_dev->sample_delay, channels);
 471
 472         adc_dev->channels = channels;
 473         return 0;
 474 }
 475
 476 static int tiadc_probe(struct platform_device *pdev)
 477 {
 478         struct iio_dev          *indio_dev;
 479         struct tiadc_device     *adc_dev;
 480         struct device_node      *node = pdev->dev.of_node;
 481         int                     err;
 482
 483         if (!node) {
 484                 dev_err(&pdev->dev, "Could not find valid DT data.\n");
 485                 return -EINVAL;
 486         }
 487
 488         indio_dev = devm_iio_device_alloc(&pdev->dev,
 489                                           sizeof(struct tiadc_device));
 490         if (indio_dev == NULL) {
 491                 dev_err(&pdev->dev, "failed to allocate iio device\n");
 492                 return -ENOMEM;
 493         }
 494         adc_dev = iio_priv(indio_dev);
 495
 496         adc_dev->mfd_tscadc = ti_tscadc_dev_get(pdev);
 497         tiadc_parse_dt(pdev, adc_dev);
 498
 499         indio_dev->dev.parent = &pdev->dev;
 500         indio_dev->name = dev_name(&pdev->dev);
 501         indio_dev->modes = INDIO_DIRECT_MODE;
 502         indio_dev->info = &tiadc_info;
 503
 504         tiadc_step_config(indio_dev);
 505         tiadc_writel(adc_dev, REG_FIFO1THR, FIFO1_THRESHOLD);
 506         mutex_init(&adc_dev->fifo1_lock);
 507
 508         err = tiadc_channel_init(indio_dev, adc_dev->channels);
 509         if (err < 0)
 510                 return err;
 511
 512         err = tiadc_iio_buffered_hardware_setup(indio_dev,
 513                 &tiadc_worker_h,
 514                 &tiadc_irq_h,
 515                 adc_dev->mfd_tscadc->irq,
 516                 IRQF_SHARED,
 517                 &tiadc_buffer_setup_ops);
 518
 519         if (err)
 520                 goto err_free_channels;
 521
 522         err = iio_device_register(indio_dev);
 523         if (err)
 524                 goto err_buffer_unregister;
 525
 526         platform_set_drvdata(pdev, indio_dev);
 527
 528         return 0;
 529
 530 err_buffer_unregister:
 531         tiadc_iio_buffered_hardware_remove(indio_dev);
 532 err_free_channels:
 533         tiadc_channels_remove(indio_dev);
 534         return err;
 535 }
 536
 537 static int tiadc_remove(struct platform_device *pdev)
 538 {
 539         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 540         struct tiadc_device *adc_dev = iio_priv(indio_dev);
 541         u32 step_en;
 542
 543         iio_device_unregister(indio_dev);
 544         tiadc_iio_buffered_hardware_remove(indio_dev);
 545         tiadc_channels_remove(indio_dev);
 546
 547         step_en = get_adc_step_mask(adc_dev);
 548         am335x_tsc_se_clr(adc_dev->mfd_tscadc, step_en);
 549
 550         return 0;
 551 }
 552
 553 #ifdef CONFIG_PM
 554 static int tiadc_suspend(struct device *dev)
 555 {
 556         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 557         struct tiadc_device *adc_dev = iio_priv(indio_dev);
 558         struct ti_tscadc_dev *tscadc_dev;
 559         unsigned int idle;
 560
 561         tscadc_dev = ti_tscadc_dev_get(to_platform_device(dev));
 562         if (!device_may_wakeup(tscadc_dev->dev)) {
 563                 idle = tiadc_readl(adc_dev, REG_CTRL);
 564                 idle &= ~(CNTRLREG_TSCSSENB);
 565                 tiadc_writel(adc_dev, REG_CTRL, (idle |
 566                                 CNTRLREG_POWERDOWN));
 567         }
 568
 569         return 0;
 570 }
 571
 572 static int tiadc_resume(struct device *dev)
 573 {
 574         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 575         struct tiadc_device *adc_dev = iio_priv(indio_dev);
 576         unsigned int restore;
 577
 578         /* Make sure ADC is powered up */
 579         restore = tiadc_readl(adc_dev, REG_CTRL);
 580         restore &= ~(CNTRLREG_POWERDOWN);
 581         tiadc_writel(adc_dev, REG_CTRL, restore);
 582
 583         tiadc_step_config(indio_dev);
 584         am335x_tsc_se_set_cache(adc_dev->mfd_tscadc,
 585                         adc_dev->buffer_en_ch_steps);
 586         return 0;
 587 }
 588
 589 static const struct dev_pm_ops tiadc_pm_ops = {
 590         .suspend = tiadc_suspend,
 591         .resume = tiadc_resume,
 592 };
 593 #define TIADC_PM_OPS (&tiadc_pm_ops)
 594 #else
 595 #define TIADC_PM_OPS NULL
 596 #endif
 597
 598 static const struct of_device_id ti_adc_dt_ids[] = {
 599         { .compatible = "ti,am3359-adc", },
 600         { }
 601 };
 602 MODULE_DEVICE_TABLE(of, ti_adc_dt_ids);
 603
 604 static struct platform_driver tiadc_driver = {
 605         .driver = {
 606                 .name   = "TI-am335x-adc",
 607                 .pm     = TIADC_PM_OPS,
 608                 .of_match_table = ti_adc_dt_ids,
 609         },
 610         .probe  = tiadc_probe,
 611         .remove = tiadc_remove,
 612 };
 613 module_platform_driver(tiadc_driver);
 614
 615 MODULE_DESCRIPTION("TI ADC controller driver");
 616 MODULE_AUTHOR("Rachna Patil <rachna@ti.com>");
 617 MODULE_LICENSE("GPL");