drivers/iio/adc/exynos_adc.c

   1 /*
   2  *  exynos_adc.c - Support for ADC in EXYNOS SoCs
   3  *
   4  *  8 ~ 10 channel, 10/12-bit ADC
   5  *
   6  *  Copyright (C) 2013 Naveen Krishna Chatradhi <ch.naveen@samsung.com>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/delay.h>
  27 #include <linux/errno.h>
  28 #include <linux/kernel.h>
  29 #include <linux/slab.h>
  30 #include <linux/io.h>
  31 #include <linux/clk.h>
  32 #include <linux/completion.h>
  33 #include <linux/of.h>
  34 #include <linux/of_irq.h>
  35 #include <linux/regulator/consumer.h>
  36 #include <linux/of_platform.h>
  37 #include <linux/err.h>
  38 #include <linux/input.h>
  39
  40 #include <linux/iio/iio.h>
  41 #include <linux/iio/machine.h>
  42 #include <linux/iio/driver.h>
  43 #include <linux/mfd/syscon.h>
  44 #include <linux/regmap.h>
  45
  46 #include <linux/platform_data/touchscreen-s3c2410.h>
  47
  48 /* S3C/EXYNOS4412/5250 ADC_V1 registers definitions */
  49 #define ADC_V1_CON(x)           ((x) + 0x00)
  50 #define ADC_V1_TSC(x)           ((x) + 0x04)
  51 #define ADC_V1_DLY(x)           ((x) + 0x08)
  52 #define ADC_V1_DATX(x)          ((x) + 0x0C)
  53 #define ADC_V1_DATY(x)          ((x) + 0x10)
  54 #define ADC_V1_UPDN(x)          ((x) + 0x14)
  55 #define ADC_V1_INTCLR(x)        ((x) + 0x18)
  56 #define ADC_V1_MUX(x)           ((x) + 0x1c)
  57 #define ADC_V1_CLRINTPNDNUP(x)  ((x) + 0x20)
  58
  59 /* S3C2410 ADC registers definitions */
  60 #define ADC_S3C2410_MUX(x)      ((x) + 0x18)
  61
  62 /* Future ADC_V2 registers definitions */
  63 #define ADC_V2_CON1(x)          ((x) + 0x00)
  64 #define ADC_V2_CON2(x)          ((x) + 0x04)
  65 #define ADC_V2_STAT(x)          ((x) + 0x08)
  66 #define ADC_V2_INT_EN(x)        ((x) + 0x10)
  67 #define ADC_V2_INT_ST(x)        ((x) + 0x14)
  68 #define ADC_V2_VER(x)           ((x) + 0x20)
  69
  70 /* Bit definitions for ADC_V1 */
  71 #define ADC_V1_CON_RES          (1u << 16)
  72 #define ADC_V1_CON_PRSCEN       (1u << 14)
  73 #define ADC_V1_CON_PRSCLV(x)    (((x) & 0xFF) << 6)
  74 #define ADC_V1_CON_STANDBY      (1u << 2)
  75
  76 /* Bit definitions for S3C2410 ADC */
  77 #define ADC_S3C2410_CON_SELMUX(x) (((x) & 7) << 3)
  78 #define ADC_S3C2410_DATX_MASK   0x3FF
  79 #define ADC_S3C2416_CON_RES_SEL (1u << 3)
  80
  81 /* touch screen always uses channel 0 */
  82 #define ADC_S3C2410_MUX_TS      0
  83
  84 /* ADCTSC Register Bits */
  85 #define ADC_S3C2443_TSC_UD_SEN          (1u << 8)
  86 #define ADC_S3C2410_TSC_YM_SEN          (1u << 7)
  87 #define ADC_S3C2410_TSC_YP_SEN          (1u << 6)
  88 #define ADC_S3C2410_TSC_XM_SEN          (1u << 5)
  89 #define ADC_S3C2410_TSC_XP_SEN          (1u << 4)
  90 #define ADC_S3C2410_TSC_PULL_UP_DISABLE (1u << 3)
  91 #define ADC_S3C2410_TSC_AUTO_PST        (1u << 2)
  92 #define ADC_S3C2410_TSC_XY_PST(x)       (((x) & 0x3) << 0)
  93
  94 #define ADC_TSC_WAIT4INT (ADC_S3C2410_TSC_YM_SEN | \
  95                          ADC_S3C2410_TSC_YP_SEN | \
  96                          ADC_S3C2410_TSC_XP_SEN | \
  97                          ADC_S3C2410_TSC_XY_PST(3))
  98
  99 #define ADC_TSC_AUTOPST (ADC_S3C2410_TSC_YM_SEN | \
 100                          ADC_S3C2410_TSC_YP_SEN | \
 101                          ADC_S3C2410_TSC_XP_SEN | \
 102                          ADC_S3C2410_TSC_AUTO_PST | \
 103                          ADC_S3C2410_TSC_XY_PST(0))
 104
 105 /* Bit definitions for ADC_V2 */
 106 #define ADC_V2_CON1_SOFT_RESET  (1u << 2)
 107
 108 #define ADC_V2_CON2_OSEL        (1u << 10)
 109 #define ADC_V2_CON2_ESEL        (1u << 9)
 110 #define ADC_V2_CON2_HIGHF       (1u << 8)
 111 #define ADC_V2_CON2_C_TIME(x)   (((x) & 7) << 4)
 112 #define ADC_V2_CON2_ACH_SEL(x)  (((x) & 0xF) << 0)
 113 #define ADC_V2_CON2_ACH_MASK    0xF
 114
 115 #define MAX_ADC_V2_CHANNELS             10
 116 #define MAX_ADC_V1_CHANNELS             8
 117 #define MAX_EXYNOS3250_ADC_CHANNELS     2
 118
 119 /* Bit definitions common for ADC_V1 and ADC_V2 */
 120 #define ADC_CON_EN_START        (1u << 0)
 121 #define ADC_CON_EN_START_MASK   (0x3 << 0)
 122 #define ADC_DATX_PRESSED        (1u << 15)
 123 #define ADC_DATX_MASK           0xFFF
 124 #define ADC_DATY_MASK           0xFFF
 125
 126 #define EXYNOS_ADC_TIMEOUT      (msecs_to_jiffies(100))
 127
 128 #define EXYNOS_ADCV1_PHY_OFFSET 0x0718
 129 #define EXYNOS_ADCV2_PHY_OFFSET 0x0720
 130
 131 struct exynos_adc {
 132         struct exynos_adc_data  *data;
 133         struct device           *dev;
 134         struct input_dev        *input;
 135         void __iomem            *regs;
 136         struct regmap           *pmu_map;
 137         struct clk              *clk;
 138         struct clk              *sclk;
 139         unsigned int            irq;
 140         unsigned int            tsirq;
 141         unsigned int            delay;
 142         struct regulator        *vdd;
 143
 144         struct completion       completion;
 145
 146         u32                     value;
 147         unsigned int            version;
 148
 149         bool                    read_ts;
 150         u32                     ts_x;
 151         u32                     ts_y;
 152 };
 153
 154 struct exynos_adc_data {
 155         int num_channels;
 156         bool needs_sclk;
 157         bool needs_adc_phy;
 158         int phy_offset;
 159         u32 mask;
 160
 161         void (*init_hw)(struct exynos_adc *info);
 162         void (*exit_hw)(struct exynos_adc *info);
 163         void (*clear_irq)(struct exynos_adc *info);
 164         void (*start_conv)(struct exynos_adc *info, unsigned long addr);
 165 };
 166
 167 static void exynos_adc_unprepare_clk(struct exynos_adc *info)
 168 {
 169         if (info->data->needs_sclk)
 170                 clk_unprepare(info->sclk);
 171         clk_unprepare(info->clk);
 172 }
 173
 174 static int exynos_adc_prepare_clk(struct exynos_adc *info)
 175 {
 176         int ret;
 177
 178         ret = clk_prepare(info->clk);
 179         if (ret) {
 180                 dev_err(info->dev, "failed preparing adc clock: %d\n", ret);
 181                 return ret;
 182         }
 183
 184         if (info->data->needs_sclk) {
 185                 ret = clk_prepare(info->sclk);
 186                 if (ret) {
 187                         clk_unprepare(info->clk);
 188                         dev_err(info->dev,
 189                                 "failed preparing sclk_adc clock: %d\n", ret);
 190                         return ret;
 191                 }
 192         }
 193
 194         return 0;
 195 }
 196
 197 static void exynos_adc_disable_clk(struct exynos_adc *info)
 198 {
 199         if (info->data->needs_sclk)
 200                 clk_disable(info->sclk);
 201         clk_disable(info->clk);
 202 }
 203
 204 static int exynos_adc_enable_clk(struct exynos_adc *info)
 205 {
 206         int ret;
 207
 208         ret = clk_enable(info->clk);
 209         if (ret) {
 210                 dev_err(info->dev, "failed enabling adc clock: %d\n", ret);
 211                 return ret;
 212         }
 213
 214         if (info->data->needs_sclk) {
 215                 ret = clk_enable(info->sclk);
 216                 if (ret) {
 217                         clk_disable(info->clk);
 218                         dev_err(info->dev,
 219                                 "failed enabling sclk_adc clock: %d\n", ret);
 220                         return ret;
 221                 }
 222         }
 223
 224         return 0;
 225 }
 226
 227 static void exynos_adc_v1_init_hw(struct exynos_adc *info)
 228 {
 229         u32 con1;
 230
 231         if (info->data->needs_adc_phy)
 232                 regmap_write(info->pmu_map, info->data->phy_offset, 1);
 233
 234         /* set default prescaler values and Enable prescaler */
 235         con1 =  ADC_V1_CON_PRSCLV(49) | ADC_V1_CON_PRSCEN;
 236
 237         /* Enable 12-bit ADC resolution */
 238         con1 |= ADC_V1_CON_RES;
 239         writel(con1, ADC_V1_CON(info->regs));
 240
 241         /* set touchscreen delay */
 242         writel(info->delay, ADC_V1_DLY(info->regs));
 243 }
 244
 245 static void exynos_adc_v1_exit_hw(struct exynos_adc *info)
 246 {
 247         u32 con;
 248
 249         if (info->data->needs_adc_phy)
 250                 regmap_write(info->pmu_map, info->data->phy_offset, 0);
 251
 252         con = readl(ADC_V1_CON(info->regs));
 253         con |= ADC_V1_CON_STANDBY;
 254         writel(con, ADC_V1_CON(info->regs));
 255 }
 256
 257 static void exynos_adc_v1_clear_irq(struct exynos_adc *info)
 258 {
 259         writel(1, ADC_V1_INTCLR(info->regs));
 260 }
 261
 262 static void exynos_adc_v1_start_conv(struct exynos_adc *info,
 263                                      unsigned long addr)
 264 {
 265         u32 con1;
 266
 267         writel(addr, ADC_V1_MUX(info->regs));
 268
 269         con1 = readl(ADC_V1_CON(info->regs));
 270         writel(con1 | ADC_CON_EN_START, ADC_V1_CON(info->regs));
 271 }
 272
 273 static const struct exynos_adc_data exynos_adc_v1_data = {
 274         .num_channels   = MAX_ADC_V1_CHANNELS,
 275         .mask           = ADC_DATX_MASK,        /* 12 bit ADC resolution */
 276         .needs_adc_phy  = true,
 277         .phy_offset     = EXYNOS_ADCV1_PHY_OFFSET,
 278
 279         .init_hw        = exynos_adc_v1_init_hw,
 280         .exit_hw        = exynos_adc_v1_exit_hw,
 281         .clear_irq      = exynos_adc_v1_clear_irq,
 282         .start_conv     = exynos_adc_v1_start_conv,
 283 };
 284
 285 static void exynos_adc_s3c2416_start_conv(struct exynos_adc *info,
 286                                           unsigned long addr)
 287 {
 288         u32 con1;
 289
 290         /* Enable 12 bit ADC resolution */
 291         con1 = readl(ADC_V1_CON(info->regs));
 292         con1 |= ADC_S3C2416_CON_RES_SEL;
 293         writel(con1, ADC_V1_CON(info->regs));
 294
 295         /* Select channel for S3C2416 */
 296         writel(addr, ADC_S3C2410_MUX(info->regs));
 297
 298         con1 = readl(ADC_V1_CON(info->regs));
 299         writel(con1 | ADC_CON_EN_START, ADC_V1_CON(info->regs));
 300 }
 301
 302 static struct exynos_adc_data const exynos_adc_s3c2416_data = {
 303         .num_channels   = MAX_ADC_V1_CHANNELS,
 304         .mask           = ADC_DATX_MASK,        /* 12 bit ADC resolution */
 305
 306         .init_hw        = exynos_adc_v1_init_hw,
 307         .exit_hw        = exynos_adc_v1_exit_hw,
 308         .start_conv     = exynos_adc_s3c2416_start_conv,
 309 };
 310
 311 static void exynos_adc_s3c2443_start_conv(struct exynos_adc *info,
 312                                           unsigned long addr)
 313 {
 314         u32 con1;
 315
 316         /* Select channel for S3C2433 */
 317         writel(addr, ADC_S3C2410_MUX(info->regs));
 318
 319         con1 = readl(ADC_V1_CON(info->regs));
 320         writel(con1 | ADC_CON_EN_START, ADC_V1_CON(info->regs));
 321 }
 322
 323 static struct exynos_adc_data const exynos_adc_s3c2443_data = {
 324         .num_channels   = MAX_ADC_V1_CHANNELS,
 325         .mask           = ADC_S3C2410_DATX_MASK, /* 10 bit ADC resolution */
 326
 327         .init_hw        = exynos_adc_v1_init_hw,
 328         .exit_hw        = exynos_adc_v1_exit_hw,
 329         .start_conv     = exynos_adc_s3c2443_start_conv,
 330 };
 331
 332 static void exynos_adc_s3c64xx_start_conv(struct exynos_adc *info,
 333                                           unsigned long addr)
 334 {
 335         u32 con1;
 336
 337         con1 = readl(ADC_V1_CON(info->regs));
 338         con1 &= ~ADC_S3C2410_CON_SELMUX(0x7);
 339         con1 |= ADC_S3C2410_CON_SELMUX(addr);
 340         writel(con1 | ADC_CON_EN_START, ADC_V1_CON(info->regs));
 341 }
 342
 343 static struct exynos_adc_data const exynos_adc_s3c24xx_data = {
 344         .num_channels   = MAX_ADC_V1_CHANNELS,
 345         .mask           = ADC_S3C2410_DATX_MASK, /* 10 bit ADC resolution */
 346
 347         .init_hw        = exynos_adc_v1_init_hw,
 348         .exit_hw        = exynos_adc_v1_exit_hw,
 349         .start_conv     = exynos_adc_s3c64xx_start_conv,
 350 };
 351
 352 static struct exynos_adc_data const exynos_adc_s3c64xx_data = {
 353         .num_channels   = MAX_ADC_V1_CHANNELS,
 354         .mask           = ADC_DATX_MASK,        /* 12 bit ADC resolution */
 355
 356         .init_hw        = exynos_adc_v1_init_hw,
 357         .exit_hw        = exynos_adc_v1_exit_hw,
 358         .clear_irq      = exynos_adc_v1_clear_irq,
 359         .start_conv     = exynos_adc_s3c64xx_start_conv,
 360 };
 361
 362 static void exynos_adc_v2_init_hw(struct exynos_adc *info)
 363 {
 364         u32 con1, con2;
 365
 366         if (info->data->needs_adc_phy)
 367                 regmap_write(info->pmu_map, info->data->phy_offset, 1);
 368
 369         con1 = ADC_V2_CON1_SOFT_RESET;
 370         writel(con1, ADC_V2_CON1(info->regs));
 371
 372         con2 = ADC_V2_CON2_OSEL | ADC_V2_CON2_ESEL |
 373                 ADC_V2_CON2_HIGHF | ADC_V2_CON2_C_TIME(0);
 374         writel(con2, ADC_V2_CON2(info->regs));
 375
 376         /* Enable interrupts */
 377         writel(1, ADC_V2_INT_EN(info->regs));
 378 }
 379
 380 static void exynos_adc_v2_exit_hw(struct exynos_adc *info)
 381 {
 382         u32 con;
 383
 384         if (info->data->needs_adc_phy)
 385                 regmap_write(info->pmu_map, info->data->phy_offset, 0);
 386
 387         con = readl(ADC_V2_CON1(info->regs));
 388         con &= ~ADC_CON_EN_START;
 389         writel(con, ADC_V2_CON1(info->regs));
 390 }
 391
 392 static void exynos_adc_v2_clear_irq(struct exynos_adc *info)
 393 {
 394         writel(1, ADC_V2_INT_ST(info->regs));
 395 }
 396
 397 static void exynos_adc_v2_start_conv(struct exynos_adc *info,
 398                                      unsigned long addr)
 399 {
 400         u32 con1, con2;
 401
 402         con2 = readl(ADC_V2_CON2(info->regs));
 403         con2 &= ~ADC_V2_CON2_ACH_MASK;
 404         con2 |= ADC_V2_CON2_ACH_SEL(addr);
 405         writel(con2, ADC_V2_CON2(info->regs));
 406
 407         con1 = readl(ADC_V2_CON1(info->regs));
 408         writel(con1 | ADC_CON_EN_START, ADC_V2_CON1(info->regs));
 409 }
 410
 411 static const struct exynos_adc_data exynos_adc_v2_data = {
 412         .num_channels   = MAX_ADC_V2_CHANNELS,
 413         .mask           = ADC_DATX_MASK, /* 12 bit ADC resolution */
 414         .needs_adc_phy  = true,
 415         .phy_offset     = EXYNOS_ADCV2_PHY_OFFSET,
 416
 417         .init_hw        = exynos_adc_v2_init_hw,
 418         .exit_hw        = exynos_adc_v2_exit_hw,
 419         .clear_irq      = exynos_adc_v2_clear_irq,
 420         .start_conv     = exynos_adc_v2_start_conv,
 421 };
 422
 423 static const struct exynos_adc_data exynos3250_adc_data = {
 424         .num_channels   = MAX_EXYNOS3250_ADC_CHANNELS,
 425         .mask           = ADC_DATX_MASK, /* 12 bit ADC resolution */
 426         .needs_sclk     = true,
 427         .needs_adc_phy  = true,
 428         .phy_offset     = EXYNOS_ADCV1_PHY_OFFSET,
 429
 430         .init_hw        = exynos_adc_v2_init_hw,
 431         .exit_hw        = exynos_adc_v2_exit_hw,
 432         .clear_irq      = exynos_adc_v2_clear_irq,
 433         .start_conv     = exynos_adc_v2_start_conv,
 434 };
 435
 436 static void exynos_adc_exynos7_init_hw(struct exynos_adc *info)
 437 {
 438         u32 con1, con2;
 439
 440         if (info->data->needs_adc_phy)
 441                 regmap_write(info->pmu_map, info->data->phy_offset, 1);
 442
 443         con1 = ADC_V2_CON1_SOFT_RESET;
 444         writel(con1, ADC_V2_CON1(info->regs));
 445
 446         con2 = readl(ADC_V2_CON2(info->regs));
 447         con2 &= ~ADC_V2_CON2_C_TIME(7);
 448         con2 |= ADC_V2_CON2_C_TIME(0);
 449         writel(con2, ADC_V2_CON2(info->regs));
 450
 451         /* Enable interrupts */
 452         writel(1, ADC_V2_INT_EN(info->regs));
 453 }
 454
 455 static const struct exynos_adc_data exynos7_adc_data = {
 456         .num_channels   = MAX_ADC_V1_CHANNELS,
 457         .mask           = ADC_DATX_MASK, /* 12 bit ADC resolution */
 458
 459         .init_hw        = exynos_adc_exynos7_init_hw,
 460         .exit_hw        = exynos_adc_v2_exit_hw,
 461         .clear_irq      = exynos_adc_v2_clear_irq,
 462         .start_conv     = exynos_adc_v2_start_conv,
 463 };
 464
 465 static const struct of_device_id exynos_adc_match[] = {
 466         {
 467                 .compatible = "samsung,s3c2410-adc",
 468                 .data = &exynos_adc_s3c24xx_data,
 469         }, {
 470                 .compatible = "samsung,s3c2416-adc",
 471                 .data = &exynos_adc_s3c2416_data,
 472         }, {
 473                 .compatible = "samsung,s3c2440-adc",
 474                 .data = &exynos_adc_s3c24xx_data,
 475         }, {
 476                 .compatible = "samsung,s3c2443-adc",
 477                 .data = &exynos_adc_s3c2443_data,
 478         }, {
 479                 .compatible = "samsung,s3c6410-adc",
 480                 .data = &exynos_adc_s3c64xx_data,
 481         }, {
 482                 .compatible = "samsung,exynos-adc-v1",
 483                 .data = &exynos_adc_v1_data,
 484         }, {
 485                 .compatible = "samsung,exynos-adc-v2",
 486                 .data = &exynos_adc_v2_data,
 487         }, {
 488                 .compatible = "samsung,exynos3250-adc",
 489                 .data = &exynos3250_adc_data,
 490         }, {
 491                 .compatible = "samsung,exynos7-adc",
 492                 .data = &exynos7_adc_data,
 493         },
 494         {},
 495 };
 496 MODULE_DEVICE_TABLE(of, exynos_adc_match);
 497
 498 static struct exynos_adc_data *exynos_adc_get_data(struct platform_device *pdev)
 499 {
 500         const struct of_device_id *match;
 501
 502         match = of_match_node(exynos_adc_match, pdev->dev.of_node);
 503         return (struct exynos_adc_data *)match->data;
 504 }
 505
 506 static int exynos_read_raw(struct iio_dev *indio_dev,
 507                                 struct iio_chan_spec const *chan,
 508                                 int *val,
 509                                 int *val2,
 510                                 long mask)
 511 {
 512         struct exynos_adc *info = iio_priv(indio_dev);
 513         unsigned long timeout;
 514         int ret;
 515
 516         if (mask != IIO_CHAN_INFO_RAW)
 517                 return -EINVAL;
 518
 519         mutex_lock(&indio_dev->mlock);
 520         reinit_completion(&info->completion);
 521
 522         /* Select the channel to be used and Trigger conversion */
 523         if (info->data->start_conv)
 524                 info->data->start_conv(info, chan->address);
 525
 526         timeout = wait_for_completion_timeout(&info->completion,
 527                                               EXYNOS_ADC_TIMEOUT);
 528         if (timeout == 0) {
 529                 dev_warn(&indio_dev->dev, "Conversion timed out! Resetting\n");
 530                 if (info->data->init_hw)
 531                         info->data->init_hw(info);
 532                 ret = -ETIMEDOUT;
 533         } else {
 534                 *val = info->value;
 535                 *val2 = 0;
 536                 ret = IIO_VAL_INT;
 537         }
 538
 539         mutex_unlock(&indio_dev->mlock);
 540
 541         return ret;
 542 }
 543
 544 static int exynos_read_s3c64xx_ts(struct iio_dev *indio_dev, int *x, int *y)
 545 {
 546         struct exynos_adc *info = iio_priv(indio_dev);
 547         unsigned long timeout;
 548         int ret;
 549
 550         mutex_lock(&indio_dev->mlock);
 551         info->read_ts = true;
 552
 553         reinit_completion(&info->completion);
 554
 555         writel(ADC_S3C2410_TSC_PULL_UP_DISABLE | ADC_TSC_AUTOPST,
 556                ADC_V1_TSC(info->regs));
 557
 558         /* Select the ts channel to be used and Trigger conversion */
 559         info->data->start_conv(info, ADC_S3C2410_MUX_TS);
 560
 561         timeout = wait_for_completion_timeout(&info->completion,
 562                                               EXYNOS_ADC_TIMEOUT);
 563         if (timeout == 0) {
 564                 dev_warn(&indio_dev->dev, "Conversion timed out! Resetting\n");
 565                 if (info->data->init_hw)
 566                         info->data->init_hw(info);
 567                 ret = -ETIMEDOUT;
 568         } else {
 569                 *x = info->ts_x;
 570                 *y = info->ts_y;
 571                 ret = 0;
 572         }
 573
 574         info->read_ts = false;
 575         mutex_unlock(&indio_dev->mlock);
 576
 577         return ret;
 578 }
 579
 580 static irqreturn_t exynos_adc_isr(int irq, void *dev_id)
 581 {
 582         struct exynos_adc *info = (struct exynos_adc *)dev_id;
 583         u32 mask = info->data->mask;
 584
 585         /* Read value */
 586         if (info->read_ts) {
 587                 info->ts_x = readl(ADC_V1_DATX(info->regs));
 588                 info->ts_y = readl(ADC_V1_DATY(info->regs));
 589                 writel(ADC_TSC_WAIT4INT | ADC_S3C2443_TSC_UD_SEN, ADC_V1_TSC(info->regs));
 590         } else {
 591                 info->value = readl(ADC_V1_DATX(info->regs)) & mask;
 592         }
 593
 594         /* clear irq */
 595         if (info->data->clear_irq)
 596                 info->data->clear_irq(info);
 597
 598         complete(&info->completion);
 599
 600         return IRQ_HANDLED;
 601 }
 602
 603 /*
 604  * Here we (ab)use a threaded interrupt handler to stay running
 605  * for as long as the touchscreen remains pressed, we report
 606  * a new event with the latest data and then sleep until the
 607  * next timer tick. This mirrors the behavior of the old
 608  * driver, with much less code.
 609  */
 610 static irqreturn_t exynos_ts_isr(int irq, void *dev_id)
 611 {
 612         struct exynos_adc *info = dev_id;
 613         struct iio_dev *dev = dev_get_drvdata(info->dev);
 614         u32 x, y;
 615         bool pressed;
 616         int ret;
 617
 618         while (info->input->users) {
 619                 ret = exynos_read_s3c64xx_ts(dev, &x, &y);
 620                 if (ret == -ETIMEDOUT)
 621                         break;
 622
 623                 pressed = x & y & ADC_DATX_PRESSED;
 624                 if (!pressed) {
 625                         input_report_key(info->input, BTN_TOUCH, 0);
 626                         input_sync(info->input);
 627                         break;
 628                 }
 629
 630                 input_report_abs(info->input, ABS_X, x & ADC_DATX_MASK);
 631                 input_report_abs(info->input, ABS_Y, y & ADC_DATY_MASK);
 632                 input_report_key(info->input, BTN_TOUCH, 1);
 633                 input_sync(info->input);
 634
 635                 msleep(1);
 636         };
 637
 638         writel(0, ADC_V1_CLRINTPNDNUP(info->regs));
 639
 640         return IRQ_HANDLED;
 641 }
 642
 643 static int exynos_adc_reg_access(struct iio_dev *indio_dev,
 644                               unsigned reg, unsigned writeval,
 645                               unsigned *readval)
 646 {
 647         struct exynos_adc *info = iio_priv(indio_dev);
 648
 649         if (readval == NULL)
 650                 return -EINVAL;
 651
 652         *readval = readl(info->regs + reg);
 653
 654         return 0;
 655 }
 656
 657 static const struct iio_info exynos_adc_iio_info = {
 658         .read_raw = &exynos_read_raw,
 659         .debugfs_reg_access = &exynos_adc_reg_access,
 660         .driver_module = THIS_MODULE,
 661 };
 662
 663 #define ADC_CHANNEL(_index, _id) {                      \
 664         .type = IIO_VOLTAGE,                            \
 665         .indexed = 1,                                   \
 666         .channel = _index,                              \
 667         .address = _index,                              \
 668         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),   \
 669         .datasheet_name = _id,                          \
 670 }
 671
 672 static const struct iio_chan_spec exynos_adc_iio_channels[] = {
 673         ADC_CHANNEL(0, "adc0"),
 674         ADC_CHANNEL(1, "adc1"),
 675         ADC_CHANNEL(2, "adc2"),
 676         ADC_CHANNEL(3, "adc3"),
 677         ADC_CHANNEL(4, "adc4"),
 678         ADC_CHANNEL(5, "adc5"),
 679         ADC_CHANNEL(6, "adc6"),
 680         ADC_CHANNEL(7, "adc7"),
 681         ADC_CHANNEL(8, "adc8"),
 682         ADC_CHANNEL(9, "adc9"),
 683 };
 684
 685 static int exynos_adc_remove_devices(struct device *dev, void *c)
 686 {
 687         struct platform_device *pdev = to_platform_device(dev);
 688
 689         platform_device_unregister(pdev);
 690
 691         return 0;
 692 }
 693
 694 static int exynos_adc_ts_open(struct input_dev *dev)
 695 {
 696         struct exynos_adc *info = input_get_drvdata(dev);
 697
 698         enable_irq(info->tsirq);
 699
 700         return 0;
 701 }
 702
 703 static void exynos_adc_ts_close(struct input_dev *dev)
 704 {
 705         struct exynos_adc *info = input_get_drvdata(dev);
 706
 707         disable_irq(info->tsirq);
 708 }
 709
 710 static int exynos_adc_ts_init(struct exynos_adc *info)
 711 {
 712         int ret;
 713
 714         if (info->tsirq <= 0)
 715                 return -ENODEV;
 716
 717         info->input = input_allocate_device();
 718         if (!info->input)
 719                 return -ENOMEM;
 720
 721         info->input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 722         info->input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 723
 724         input_set_abs_params(info->input, ABS_X, 0, 0x3FF, 0, 0);
 725         input_set_abs_params(info->input, ABS_Y, 0, 0x3FF, 0, 0);
 726
 727         info->input->name = "S3C24xx TouchScreen";
 728         info->input->id.bustype = BUS_HOST;
 729         info->input->open = exynos_adc_ts_open;
 730         info->input->close = exynos_adc_ts_close;
 731
 732         input_set_drvdata(info->input, info);
 733
 734         ret = input_register_device(info->input);
 735         if (ret) {
 736                 input_free_device(info->input);
 737                 return ret;
 738         }
 739
 740         disable_irq(info->tsirq);
 741         ret = request_threaded_irq(info->tsirq, NULL, exynos_ts_isr,
 742                                    IRQF_ONESHOT, "touchscreen", info);
 743         if (ret)
 744                 input_unregister_device(info->input);
 745
 746         return ret;
 747 }
 748
 749 static int exynos_adc_probe(struct platform_device *pdev)
 750 {
 751         struct exynos_adc *info = NULL;
 752         struct device_node *np = pdev->dev.of_node;
 753         struct s3c2410_ts_mach_info *pdata = dev_get_platdata(&pdev->dev);
 754         struct iio_dev *indio_dev = NULL;
 755         struct resource *mem;
 756         bool has_ts = false;
 757         int ret = -ENODEV;
 758         int irq;
 759
 760         indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct exynos_adc));
 761         if (!indio_dev) {
 762                 dev_err(&pdev->dev, "failed allocating iio device\n");
 763                 return -ENOMEM;
 764         }
 765
 766         info = iio_priv(indio_dev);
 767
 768         info->data = exynos_adc_get_data(pdev);
 769         if (!info->data) {
 770                 dev_err(&pdev->dev, "failed getting exynos_adc_data\n");
 771                 return -EINVAL;
 772         }
 773
 774         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 775         info->regs = devm_ioremap_resource(&pdev->dev, mem);
 776         if (IS_ERR(info->regs))
 777                 return PTR_ERR(info->regs);
 778
 779
 780         if (info->data->needs_adc_phy) {
 781                 info->pmu_map = syscon_regmap_lookup_by_phandle(
 782                                         pdev->dev.of_node,
 783                                         "samsung,syscon-phandle");
 784                 if (IS_ERR(info->pmu_map)) {
 785                         dev_err(&pdev->dev, "syscon regmap lookup failed.\n");
 786                         return PTR_ERR(info->pmu_map);
 787                 }
 788         }
 789
 790         irq = platform_get_irq(pdev, 0);
 791         if (irq < 0) {
 792                 dev_err(&pdev->dev, "no irq resource?\n");
 793                 return irq;
 794         }
 795         info->irq = irq;
 796
 797         irq = platform_get_irq(pdev, 1);
 798         if (irq == -EPROBE_DEFER)
 799                 return irq;
 800
 801         info->tsirq = irq;
 802
 803         info->dev = &pdev->dev;
 804
 805         init_completion(&info->completion);
 806
 807         info->clk = devm_clk_get(&pdev->dev, "adc");
 808         if (IS_ERR(info->clk)) {
 809                 dev_err(&pdev->dev, "failed getting clock, err = %ld\n",
 810                                                         PTR_ERR(info->clk));
 811                 return PTR_ERR(info->clk);
 812         }
 813
 814         if (info->data->needs_sclk) {
 815                 info->sclk = devm_clk_get(&pdev->dev, "sclk");
 816                 if (IS_ERR(info->sclk)) {
 817                         dev_err(&pdev->dev,
 818                                 "failed getting sclk clock, err = %ld\n",
 819                                 PTR_ERR(info->sclk));
 820                         return PTR_ERR(info->sclk);
 821                 }
 822         }
 823
 824         info->vdd = devm_regulator_get(&pdev->dev, "vdd");
 825         if (IS_ERR(info->vdd)) {
 826                 dev_err(&pdev->dev, "failed getting regulator, err = %ld\n",
 827                                                         PTR_ERR(info->vdd));
 828                 return PTR_ERR(info->vdd);
 829         }
 830
 831         ret = regulator_enable(info->vdd);
 832         if (ret)
 833                 return ret;
 834
 835         ret = exynos_adc_prepare_clk(info);
 836         if (ret)
 837                 goto err_disable_reg;
 838
 839         ret = exynos_adc_enable_clk(info);
 840         if (ret)
 841                 goto err_unprepare_clk;
 842
 843         platform_set_drvdata(pdev, indio_dev);
 844
 845         indio_dev->name = dev_name(&pdev->dev);
 846         indio_dev->dev.parent = &pdev->dev;
 847         indio_dev->dev.of_node = pdev->dev.of_node;
 848         indio_dev->info = &exynos_adc_iio_info;
 849         indio_dev->modes = INDIO_DIRECT_MODE;
 850         indio_dev->channels = exynos_adc_iio_channels;
 851         indio_dev->num_channels = info->data->num_channels;
 852
 853         ret = request_irq(info->irq, exynos_adc_isr,
 854                                         0, dev_name(&pdev->dev), info);
 855         if (ret < 0) {
 856                 dev_err(&pdev->dev, "failed requesting irq, irq = %d\n",
 857                                                         info->irq);
 858                 goto err_disable_clk;
 859         }
 860
 861         ret = iio_device_register(indio_dev);
 862         if (ret)
 863                 goto err_irq;
 864
 865         if (info->data->init_hw)
 866                 info->data->init_hw(info);
 867
 868         /* leave out any TS related code if unreachable */
 869         if (IS_REACHABLE(CONFIG_INPUT)) {
 870                 has_ts = of_property_read_bool(pdev->dev.of_node,
 871                                                "has-touchscreen") || pdata;
 872         }
 873
 874         if (pdata)
 875                 info->delay = pdata->delay;
 876         else
 877                 info->delay = 10000;
 878
 879         if (has_ts)
 880                 ret = exynos_adc_ts_init(info);
 881         if (ret)
 882                 goto err_iio;
 883
 884         ret = of_platform_populate(np, exynos_adc_match, NULL, &indio_dev->dev);
 885         if (ret < 0) {
 886                 dev_err(&pdev->dev, "failed adding child nodes\n");
 887                 goto err_of_populate;
 888         }
 889
 890         return 0;
 891
 892 err_of_populate:
 893         device_for_each_child(&indio_dev->dev, NULL,
 894                                 exynos_adc_remove_devices);
 895         if (has_ts) {
 896                 input_unregister_device(info->input);
 897                 free_irq(info->tsirq, info);
 898         }
 899 err_iio:
 900         iio_device_unregister(indio_dev);
 901 err_irq:
 902         free_irq(info->irq, info);
 903 err_disable_clk:
 904         if (info->data->exit_hw)
 905                 info->data->exit_hw(info);
 906         exynos_adc_disable_clk(info);
 907 err_unprepare_clk:
 908         exynos_adc_unprepare_clk(info);
 909 err_disable_reg:
 910         regulator_disable(info->vdd);
 911         return ret;
 912 }
 913
 914 static int exynos_adc_remove(struct platform_device *pdev)
 915 {
 916         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 917         struct exynos_adc *info = iio_priv(indio_dev);
 918
 919         if (IS_REACHABLE(CONFIG_INPUT) && info->input) {
 920                 free_irq(info->tsirq, info);
 921                 input_unregister_device(info->input);
 922         }
 923         device_for_each_child(&indio_dev->dev, NULL,
 924                                 exynos_adc_remove_devices);
 925         iio_device_unregister(indio_dev);
 926         free_irq(info->irq, info);
 927         if (info->data->exit_hw)
 928                 info->data->exit_hw(info);
 929         exynos_adc_disable_clk(info);
 930         exynos_adc_unprepare_clk(info);
 931         regulator_disable(info->vdd);
 932
 933         return 0;
 934 }
 935
 936 #ifdef CONFIG_PM_SLEEP
 937 static int exynos_adc_suspend(struct device *dev)
 938 {
 939         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 940         struct exynos_adc *info = iio_priv(indio_dev);
 941
 942         if (info->data->exit_hw)
 943                 info->data->exit_hw(info);
 944         exynos_adc_disable_clk(info);
 945         regulator_disable(info->vdd);
 946
 947         return 0;
 948 }
 949
 950 static int exynos_adc_resume(struct device *dev)
 951 {
 952         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 953         struct exynos_adc *info = iio_priv(indio_dev);
 954         int ret;
 955
 956         ret = regulator_enable(info->vdd);
 957         if (ret)
 958                 return ret;
 959
 960         ret = exynos_adc_enable_clk(info);
 961         if (ret)
 962                 return ret;
 963
 964         if (info->data->init_hw)
 965                 info->data->init_hw(info);
 966
 967         return 0;
 968 }
 969 #endif
 970
 971 static SIMPLE_DEV_PM_OPS(exynos_adc_pm_ops,
 972                         exynos_adc_suspend,
 973                         exynos_adc_resume);
 974
 975 static struct platform_driver exynos_adc_driver = {
 976         .probe          = exynos_adc_probe,
 977         .remove         = exynos_adc_remove,
 978         .driver         = {
 979                 .name   = "exynos-adc",
 980                 .of_match_table = exynos_adc_match,
 981                 .pm     = &exynos_adc_pm_ops,
 982         },
 983 };
 984
 985 module_platform_driver(exynos_adc_driver);
 986
 987 MODULE_AUTHOR("Naveen Krishna Chatradhi <ch.naveen@samsung.com>");
 988 MODULE_DESCRIPTION("Samsung EXYNOS5 ADC driver");
 989 MODULE_LICENSE("GPL v2");