drivers/iio/adc/exynos_adc.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  exynos_adc.c - Support for ADC in EXYNOS SoCs
   4  *
   5  *  8 ~ 10 channel, 10/12-bit ADC
   6  *
   7  *  Copyright (C) 2013 Naveen Krishna Chatradhi <[email protected]>
   8  */
   9
  10 #include <linux/compiler.h>
  11 #include <linux/module.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/delay.h>
  15 #include <linux/errno.h>
  16 #include <linux/kernel.h>
  17 #include <linux/slab.h>
  18 #include <linux/io.h>
  19 #include <linux/clk.h>
  20 #include <linux/completion.h>
  21 #include <linux/of.h>
  22 #include <linux/of_irq.h>
  23 #include <linux/regulator/consumer.h>
  24 #include <linux/of_platform.h>
  25 #include <linux/err.h>
  26 #include <linux/input.h>
  27
  28 #include <linux/iio/iio.h>
  29 #include <linux/iio/machine.h>
  30 #include <linux/iio/driver.h>
  31 #include <linux/mfd/syscon.h>
  32 #include <linux/regmap.h>
  33
  34 #include <linux/platform_data/touchscreen-s3c2410.h>
  35
  36 /* S3C/EXYNOS4412/5250 ADC_V1 registers definitions */
  37 #define ADC_V1_CON(x)           ((x) + 0x00)
  38 #define ADC_V1_TSC(x)           ((x) + 0x04)
  39 #define ADC_V1_DLY(x)           ((x) + 0x08)
  40 #define ADC_V1_DATX(x)          ((x) + 0x0C)
  41 #define ADC_V1_DATY(x)          ((x) + 0x10)
  42 #define ADC_V1_UPDN(x)          ((x) + 0x14)
  43 #define ADC_V1_INTCLR(x)        ((x) + 0x18)
  44 #define ADC_V1_MUX(x)           ((x) + 0x1c)
  45 #define ADC_V1_CLRINTPNDNUP(x)  ((x) + 0x20)
  46
  47 /* S3C2410 ADC registers definitions */
  48 #define ADC_S3C2410_MUX(x)      ((x) + 0x18)
  49
  50 /* Future ADC_V2 registers definitions */
  51 #define ADC_V2_CON1(x)          ((x) + 0x00)
  52 #define ADC_V2_CON2(x)          ((x) + 0x04)
  53 #define ADC_V2_STAT(x)          ((x) + 0x08)
  54 #define ADC_V2_INT_EN(x)        ((x) + 0x10)
  55 #define ADC_V2_INT_ST(x)        ((x) + 0x14)
  56 #define ADC_V2_VER(x)           ((x) + 0x20)
  57
  58 /* Bit definitions for ADC_V1 */
  59 #define ADC_V1_CON_RES          (1u << 16)
  60 #define ADC_V1_CON_PRSCEN       (1u << 14)
  61 #define ADC_V1_CON_PRSCLV(x)    (((x) & 0xFF) << 6)
  62 #define ADC_V1_CON_STANDBY      (1u << 2)
  63
  64 /* Bit definitions for S3C2410 ADC */
  65 #define ADC_S3C2410_CON_SELMUX(x) (((x) & 7) << 3)
  66 #define ADC_S3C2410_DATX_MASK   0x3FF
  67 #define ADC_S3C2416_CON_RES_SEL (1u << 3)
  68
  69 /* touch screen always uses channel 0 */
  70 #define ADC_S3C2410_MUX_TS      0
  71
  72 /* ADCTSC Register Bits */
  73 #define ADC_S3C2443_TSC_UD_SEN          (1u << 8)
  74 #define ADC_S3C2410_TSC_YM_SEN          (1u << 7)
  75 #define ADC_S3C2410_TSC_YP_SEN          (1u << 6)
  76 #define ADC_S3C2410_TSC_XM_SEN          (1u << 5)
  77 #define ADC_S3C2410_TSC_XP_SEN          (1u << 4)
  78 #define ADC_S3C2410_TSC_PULL_UP_DISABLE (1u << 3)
  79 #define ADC_S3C2410_TSC_AUTO_PST        (1u << 2)
  80 #define ADC_S3C2410_TSC_XY_PST(x)       (((x) & 0x3) << 0)
  81
  82 #define ADC_TSC_WAIT4INT (ADC_S3C2410_TSC_YM_SEN | \
  83                          ADC_S3C2410_TSC_YP_SEN | \
  84                          ADC_S3C2410_TSC_XP_SEN | \
  85                          ADC_S3C2410_TSC_XY_PST(3))
  86
  87 #define ADC_TSC_AUTOPST (ADC_S3C2410_TSC_YM_SEN | \
  88                          ADC_S3C2410_TSC_YP_SEN | \
  89                          ADC_S3C2410_TSC_XP_SEN | \
  90                          ADC_S3C2410_TSC_AUTO_PST | \
  91                          ADC_S3C2410_TSC_XY_PST(0))
  92
  93 /* Bit definitions for ADC_V2 */
  94 #define ADC_V2_CON1_SOFT_RESET  (1u << 2)
  95
  96 #define ADC_V2_CON2_OSEL        (1u << 10)
  97 #define ADC_V2_CON2_ESEL        (1u << 9)
  98 #define ADC_V2_CON2_HIGHF       (1u << 8)
  99 #define ADC_V2_CON2_C_TIME(x)   (((x) & 7) << 4)
 100 #define ADC_V2_CON2_ACH_SEL(x)  (((x) & 0xF) << 0)
 101 #define ADC_V2_CON2_ACH_MASK    0xF
 102
 103 #define MAX_ADC_V2_CHANNELS             10
 104 #define MAX_ADC_V1_CHANNELS             8
 105 #define MAX_EXYNOS3250_ADC_CHANNELS     2
 106 #define MAX_EXYNOS4212_ADC_CHANNELS     4
 107 #define MAX_S5PV210_ADC_CHANNELS        10
 108
 109 /* Bit definitions common for ADC_V1 and ADC_V2 */
 110 #define ADC_CON_EN_START        (1u << 0)
 111 #define ADC_CON_EN_START_MASK   (0x3 << 0)
 112 #define ADC_DATX_PRESSED        (1u << 15)
 113 #define ADC_DATX_MASK           0xFFF
 114 #define ADC_DATY_MASK           0xFFF
 115
 116 #define EXYNOS_ADC_TIMEOUT      (msecs_to_jiffies(100))
 117
 118 #define EXYNOS_ADCV1_PHY_OFFSET 0x0718
 119 #define EXYNOS_ADCV2_PHY_OFFSET 0x0720
 120
 121 struct exynos_adc {
 122         struct exynos_adc_data  *data;
 123         struct device           *dev;
 124         struct input_dev        *input;
 125         void __iomem            *regs;
 126         struct regmap           *pmu_map;
 127         struct clk              *clk;
 128         struct clk              *sclk;
 129         unsigned int            irq;
 130         unsigned int            tsirq;
 131         unsigned int            delay;
 132         struct regulator        *vdd;
 133
 134         struct completion       completion;
 135
 136         u32                     value;
 137         unsigned int            version;
 138
 139         bool                    ts_enabled;
 140
 141         bool                    read_ts;
 142         u32                     ts_x;
 143         u32                     ts_y;
 144
 145         /*
 146          * Lock to protect from potential concurrent access to the
 147          * completion callback during a manual conversion. For this driver
 148          * a wait-callback is used to wait for the conversion result,
 149          * so in the meantime no other read request (or conversion start)
 150          * must be performed, otherwise it would interfere with the
 151          * current conversion result.
 152          */
 153         struct mutex            lock;
 154 };
 155
 156 struct exynos_adc_data {
 157         int num_channels;
 158         bool needs_sclk;
 159         bool needs_adc_phy;
 160         int phy_offset;
 161         u32 mask;
 162
 163         void (*init_hw)(struct exynos_adc *info);
 164         void (*exit_hw)(struct exynos_adc *info);
 165         void (*clear_irq)(struct exynos_adc *info);
 166         void (*start_conv)(struct exynos_adc *info, unsigned long addr);
 167 };
 168
 169 static void exynos_adc_unprepare_clk(struct exynos_adc *info)
 170 {
 171         if (info->data->needs_sclk)
 172                 clk_unprepare(info->sclk);
 173         clk_unprepare(info->clk);
 174 }
 175
 176 static int exynos_adc_prepare_clk(struct exynos_adc *info)
 177 {
 178         int ret;
 179
 180         ret = clk_prepare(info->clk);
 181         if (ret) {
 182                 dev_err(info->dev, "failed preparing adc clock: %d\n", ret);
 183                 return ret;
 184         }
 185
 186         if (info->data->needs_sclk) {
 187                 ret = clk_prepare(info->sclk);
 188                 if (ret) {
 189                         clk_unprepare(info->clk);
 190                         dev_err(info->dev,
 191                                 "failed preparing sclk_adc clock: %d\n", ret);
 192                         return ret;
 193                 }
 194         }
 195
 196         return 0;
 197 }
 198
 199 static void exynos_adc_disable_clk(struct exynos_adc *info)
 200 {
 201         if (info->data->needs_sclk)
 202                 clk_disable(info->sclk);
 203         clk_disable(info->clk);
 204 }
 205
 206 static int exynos_adc_enable_clk(struct exynos_adc *info)
 207 {
 208         int ret;
 209
 210         ret = clk_enable(info->clk);
 211         if (ret) {
 212                 dev_err(info->dev, "failed enabling adc clock: %d\n", ret);
 213                 return ret;
 214         }
 215
 216         if (info->data->needs_sclk) {
 217                 ret = clk_enable(info->sclk);
 218                 if (ret) {
 219                         clk_disable(info->clk);
 220                         dev_err(info->dev,
 221                                 "failed enabling sclk_adc clock: %d\n", ret);
 222                         return ret;
 223                 }
 224         }
 225
 226         return 0;
 227 }
 228
 229 static void exynos_adc_v1_init_hw(struct exynos_adc *info)
 230 {
 231         u32 con1;
 232
 233         if (info->data->needs_adc_phy)
 234                 regmap_write(info->pmu_map, info->data->phy_offset, 1);
 235
 236         /* set default prescaler values and Enable prescaler */
 237         con1 =  ADC_V1_CON_PRSCLV(49) | ADC_V1_CON_PRSCEN;
 238
 239         /* Enable 12-bit ADC resolution */
 240         con1 |= ADC_V1_CON_RES;
 241         writel(con1, ADC_V1_CON(info->regs));
 242
 243         /* set touchscreen delay */
 244         writel(info->delay, ADC_V1_DLY(info->regs));
 245 }
 246
 247 static void exynos_adc_v1_exit_hw(struct exynos_adc *info)
 248 {
 249         u32 con;
 250
 251         if (info->data->needs_adc_phy)
 252                 regmap_write(info->pmu_map, info->data->phy_offset, 0);
 253
 254         con = readl(ADC_V1_CON(info->regs));
 255         con |= ADC_V1_CON_STANDBY;
 256         writel(con, ADC_V1_CON(info->regs));
 257 }
 258
 259 static void exynos_adc_v1_clear_irq(struct exynos_adc *info)
 260 {
 261         writel(1, ADC_V1_INTCLR(info->regs));
 262 }
 263
 264 static void exynos_adc_v1_start_conv(struct exynos_adc *info,
 265                                      unsigned long addr)
 266 {
 267         u32 con1;
 268
 269         writel(addr, ADC_V1_MUX(info->regs));
 270
 271         con1 = readl(ADC_V1_CON(info->regs));
 272         writel(con1 | ADC_CON_EN_START, ADC_V1_CON(info->regs));
 273 }
 274
 275 /* Exynos4212 and 4412 is like ADCv1 but with four channels only */
 276 static const struct exynos_adc_data exynos4212_adc_data = {
 277         .num_channels   = MAX_EXYNOS4212_ADC_CHANNELS,
 278         .mask           = ADC_DATX_MASK,        /* 12 bit ADC resolution */
 279         .needs_adc_phy  = true,
 280         .phy_offset     = EXYNOS_ADCV1_PHY_OFFSET,
 281
 282         .init_hw        = exynos_adc_v1_init_hw,
 283         .exit_hw        = exynos_adc_v1_exit_hw,
 284         .clear_irq      = exynos_adc_v1_clear_irq,
 285         .start_conv     = exynos_adc_v1_start_conv,
 286 };
 287
 288 static const struct exynos_adc_data exynos_adc_v1_data = {
 289         .num_channels   = MAX_ADC_V1_CHANNELS,
 290         .mask           = ADC_DATX_MASK,        /* 12 bit ADC resolution */
 291         .needs_adc_phy  = true,
 292         .phy_offset     = EXYNOS_ADCV1_PHY_OFFSET,
 293
 294         .init_hw        = exynos_adc_v1_init_hw,
 295         .exit_hw        = exynos_adc_v1_exit_hw,
 296         .clear_irq      = exynos_adc_v1_clear_irq,
 297         .start_conv     = exynos_adc_v1_start_conv,
 298 };
 299
 300 static const struct exynos_adc_data exynos_adc_s5pv210_data = {
 301         .num_channels   = MAX_S5PV210_ADC_CHANNELS,
 302         .mask           = ADC_DATX_MASK,        /* 12 bit ADC resolution */
 303
 304         .init_hw        = exynos_adc_v1_init_hw,
 305         .exit_hw        = exynos_adc_v1_exit_hw,
 306         .clear_irq      = exynos_adc_v1_clear_irq,
 307         .start_conv     = exynos_adc_v1_start_conv,
 308 };
 309
 310 static void exynos_adc_s3c2416_start_conv(struct exynos_adc *info,
 311                                           unsigned long addr)
 312 {
 313         u32 con1;
 314
 315         /* Enable 12 bit ADC resolution */
 316         con1 = readl(ADC_V1_CON(info->regs));
 317         con1 |= ADC_S3C2416_CON_RES_SEL;
 318         writel(con1, ADC_V1_CON(info->regs));
 319
 320         /* Select channel for S3C2416 */
 321         writel(addr, ADC_S3C2410_MUX(info->regs));
 322
 323         con1 = readl(ADC_V1_CON(info->regs));
 324         writel(con1 | ADC_CON_EN_START, ADC_V1_CON(info->regs));
 325 }
 326
 327 static struct exynos_adc_data const exynos_adc_s3c2416_data = {
 328         .num_channels   = MAX_ADC_V1_CHANNELS,
 329         .mask           = ADC_DATX_MASK,        /* 12 bit ADC resolution */
 330
 331         .init_hw        = exynos_adc_v1_init_hw,
 332         .exit_hw        = exynos_adc_v1_exit_hw,
 333         .start_conv     = exynos_adc_s3c2416_start_conv,
 334 };
 335
 336 static void exynos_adc_s3c2443_start_conv(struct exynos_adc *info,
 337                                           unsigned long addr)
 338 {
 339         u32 con1;
 340
 341         /* Select channel for S3C2433 */
 342         writel(addr, ADC_S3C2410_MUX(info->regs));
 343
 344         con1 = readl(ADC_V1_CON(info->regs));
 345         writel(con1 | ADC_CON_EN_START, ADC_V1_CON(info->regs));
 346 }
 347
 348 static struct exynos_adc_data const exynos_adc_s3c2443_data = {
 349         .num_channels   = MAX_ADC_V1_CHANNELS,
 350         .mask           = ADC_S3C2410_DATX_MASK, /* 10 bit ADC resolution */
 351
 352         .init_hw        = exynos_adc_v1_init_hw,
 353         .exit_hw        = exynos_adc_v1_exit_hw,
 354         .start_conv     = exynos_adc_s3c2443_start_conv,
 355 };
 356
 357 static void exynos_adc_s3c64xx_start_conv(struct exynos_adc *info,
 358                                           unsigned long addr)
 359 {
 360         u32 con1;
 361
 362         con1 = readl(ADC_V1_CON(info->regs));
 363         con1 &= ~ADC_S3C2410_CON_SELMUX(0x7);
 364         con1 |= ADC_S3C2410_CON_SELMUX(addr);
 365         writel(con1 | ADC_CON_EN_START, ADC_V1_CON(info->regs));
 366 }
 367
 368 static struct exynos_adc_data const exynos_adc_s3c24xx_data = {
 369         .num_channels   = MAX_ADC_V1_CHANNELS,
 370         .mask           = ADC_S3C2410_DATX_MASK, /* 10 bit ADC resolution */
 371
 372         .init_hw        = exynos_adc_v1_init_hw,
 373         .exit_hw        = exynos_adc_v1_exit_hw,
 374         .start_conv     = exynos_adc_s3c64xx_start_conv,
 375 };
 376
 377 static struct exynos_adc_data const exynos_adc_s3c64xx_data = {
 378         .num_channels   = MAX_ADC_V1_CHANNELS,
 379         .mask           = ADC_DATX_MASK,        /* 12 bit ADC resolution */
 380
 381         .init_hw        = exynos_adc_v1_init_hw,
 382         .exit_hw        = exynos_adc_v1_exit_hw,
 383         .clear_irq      = exynos_adc_v1_clear_irq,
 384         .start_conv     = exynos_adc_s3c64xx_start_conv,
 385 };
 386
 387 static void exynos_adc_v2_init_hw(struct exynos_adc *info)
 388 {
 389         u32 con1, con2;
 390
 391         if (info->data->needs_adc_phy)
 392                 regmap_write(info->pmu_map, info->data->phy_offset, 1);
 393
 394         con1 = ADC_V2_CON1_SOFT_RESET;
 395         writel(con1, ADC_V2_CON1(info->regs));
 396
 397         con2 = ADC_V2_CON2_OSEL | ADC_V2_CON2_ESEL |
 398                 ADC_V2_CON2_HIGHF | ADC_V2_CON2_C_TIME(0);
 399         writel(con2, ADC_V2_CON2(info->regs));
 400
 401         /* Enable interrupts */
 402         writel(1, ADC_V2_INT_EN(info->regs));
 403 }
 404
 405 static void exynos_adc_v2_exit_hw(struct exynos_adc *info)
 406 {
 407         u32 con;
 408
 409         if (info->data->needs_adc_phy)
 410                 regmap_write(info->pmu_map, info->data->phy_offset, 0);
 411
 412         con = readl(ADC_V2_CON1(info->regs));
 413         con &= ~ADC_CON_EN_START;
 414         writel(con, ADC_V2_CON1(info->regs));
 415 }
 416
 417 static void exynos_adc_v2_clear_irq(struct exynos_adc *info)
 418 {
 419         writel(1, ADC_V2_INT_ST(info->regs));
 420 }
 421
 422 static void exynos_adc_v2_start_conv(struct exynos_adc *info,
 423                                      unsigned long addr)
 424 {
 425         u32 con1, con2;
 426
 427         con2 = readl(ADC_V2_CON2(info->regs));
 428         con2 &= ~ADC_V2_CON2_ACH_MASK;
 429         con2 |= ADC_V2_CON2_ACH_SEL(addr);
 430         writel(con2, ADC_V2_CON2(info->regs));
 431
 432         con1 = readl(ADC_V2_CON1(info->regs));
 433         writel(con1 | ADC_CON_EN_START, ADC_V2_CON1(info->regs));
 434 }
 435
 436 static const struct exynos_adc_data exynos_adc_v2_data = {
 437         .num_channels   = MAX_ADC_V2_CHANNELS,
 438         .mask           = ADC_DATX_MASK, /* 12 bit ADC resolution */
 439         .needs_adc_phy  = true,
 440         .phy_offset     = EXYNOS_ADCV2_PHY_OFFSET,
 441
 442         .init_hw        = exynos_adc_v2_init_hw,
 443         .exit_hw        = exynos_adc_v2_exit_hw,
 444         .clear_irq      = exynos_adc_v2_clear_irq,
 445         .start_conv     = exynos_adc_v2_start_conv,
 446 };
 447
 448 static const struct exynos_adc_data exynos3250_adc_data = {
 449         .num_channels   = MAX_EXYNOS3250_ADC_CHANNELS,
 450         .mask           = ADC_DATX_MASK, /* 12 bit ADC resolution */
 451         .needs_sclk     = true,
 452         .needs_adc_phy  = true,
 453         .phy_offset     = EXYNOS_ADCV1_PHY_OFFSET,
 454
 455         .init_hw        = exynos_adc_v2_init_hw,
 456         .exit_hw        = exynos_adc_v2_exit_hw,
 457         .clear_irq      = exynos_adc_v2_clear_irq,
 458         .start_conv     = exynos_adc_v2_start_conv,
 459 };
 460
 461 static void exynos_adc_exynos7_init_hw(struct exynos_adc *info)
 462 {
 463         u32 con1, con2;
 464
 465         con1 = ADC_V2_CON1_SOFT_RESET;
 466         writel(con1, ADC_V2_CON1(info->regs));
 467
 468         con2 = readl(ADC_V2_CON2(info->regs));
 469         con2 &= ~ADC_V2_CON2_C_TIME(7);
 470         con2 |= ADC_V2_CON2_C_TIME(0);
 471         writel(con2, ADC_V2_CON2(info->regs));
 472
 473         /* Enable interrupts */
 474         writel(1, ADC_V2_INT_EN(info->regs));
 475 }
 476
 477 static const struct exynos_adc_data exynos7_adc_data = {
 478         .num_channels   = MAX_ADC_V1_CHANNELS,
 479         .mask           = ADC_DATX_MASK, /* 12 bit ADC resolution */
 480
 481         .init_hw        = exynos_adc_exynos7_init_hw,
 482         .exit_hw        = exynos_adc_v2_exit_hw,
 483         .clear_irq      = exynos_adc_v2_clear_irq,
 484         .start_conv     = exynos_adc_v2_start_conv,
 485 };
 486
 487 static const struct of_device_id exynos_adc_match[] = {
 488         {
 489                 .compatible = "samsung,s3c2410-adc",
 490                 .data = &exynos_adc_s3c24xx_data,
 491         }, {
 492                 .compatible = "samsung,s3c2416-adc",
 493                 .data = &exynos_adc_s3c2416_data,
 494         }, {
 495                 .compatible = "samsung,s3c2440-adc",
 496                 .data = &exynos_adc_s3c24xx_data,
 497         }, {
 498                 .compatible = "samsung,s3c2443-adc",
 499                 .data = &exynos_adc_s3c2443_data,
 500         }, {
 501                 .compatible = "samsung,s3c6410-adc",
 502                 .data = &exynos_adc_s3c64xx_data,
 503         }, {
 504                 .compatible = "samsung,s5pv210-adc",
 505                 .data = &exynos_adc_s5pv210_data,
 506         }, {
 507                 .compatible = "samsung,exynos4212-adc",
 508                 .data = &exynos4212_adc_data,
 509         }, {
 510                 .compatible = "samsung,exynos-adc-v1",
 511                 .data = &exynos_adc_v1_data,
 512         }, {
 513                 .compatible = "samsung,exynos-adc-v2",
 514                 .data = &exynos_adc_v2_data,
 515         }, {
 516                 .compatible = "samsung,exynos3250-adc",
 517                 .data = &exynos3250_adc_data,
 518         }, {
 519                 .compatible = "samsung,exynos7-adc",
 520                 .data = &exynos7_adc_data,
 521         },
 522         {},
 523 };
 524 MODULE_DEVICE_TABLE(of, exynos_adc_match);
 525
 526 static struct exynos_adc_data *exynos_adc_get_data(struct platform_device *pdev)
 527 {
 528         const struct of_device_id *match;
 529
 530         match = of_match_node(exynos_adc_match, pdev->dev.of_node);
 531         return (struct exynos_adc_data *)match->data;
 532 }
 533
 534 static int exynos_read_raw(struct iio_dev *indio_dev,
 535                                 struct iio_chan_spec const *chan,
 536                                 int *val,
 537                                 int *val2,
 538                                 long mask)
 539 {
 540         struct exynos_adc *info = iio_priv(indio_dev);
 541         unsigned long timeout;
 542         int ret;
 543
 544         if (mask == IIO_CHAN_INFO_SCALE) {
 545                 ret = regulator_get_voltage(info->vdd);
 546                 if (ret < 0)
 547                         return ret;
 548
 549                 /* Regulator voltage is in uV, but need mV */
 550                 *val = ret / 1000;
 551                 *val2 = info->data->mask;
 552
 553                 return IIO_VAL_FRACTIONAL;
 554         } else if (mask != IIO_CHAN_INFO_RAW) {
 555                 return -EINVAL;
 556         }
 557
 558         mutex_lock(&info->lock);
 559         reinit_completion(&info->completion);
 560
 561         /* Select the channel to be used and Trigger conversion */
 562         if (info->data->start_conv)
 563                 info->data->start_conv(info, chan->address);
 564
 565         timeout = wait_for_completion_timeout(&info->completion,
 566                                               EXYNOS_ADC_TIMEOUT);
 567         if (timeout == 0) {
 568                 dev_warn(&indio_dev->dev, "Conversion timed out! Resetting\n");
 569                 if (info->data->init_hw)
 570                         info->data->init_hw(info);
 571                 ret = -ETIMEDOUT;
 572         } else {
 573                 *val = info->value;
 574                 *val2 = 0;
 575                 ret = IIO_VAL_INT;
 576         }
 577
 578         mutex_unlock(&info->lock);
 579
 580         return ret;
 581 }
 582
 583 static int exynos_read_s3c64xx_ts(struct iio_dev *indio_dev, int *x, int *y)
 584 {
 585         struct exynos_adc *info = iio_priv(indio_dev);
 586         unsigned long timeout;
 587         int ret;
 588
 589         mutex_lock(&info->lock);
 590         info->read_ts = true;
 591
 592         reinit_completion(&info->completion);
 593
 594         writel(ADC_S3C2410_TSC_PULL_UP_DISABLE | ADC_TSC_AUTOPST,
 595                ADC_V1_TSC(info->regs));
 596
 597         /* Select the ts channel to be used and Trigger conversion */
 598         info->data->start_conv(info, ADC_S3C2410_MUX_TS);
 599
 600         timeout = wait_for_completion_timeout(&info->completion,
 601                                               EXYNOS_ADC_TIMEOUT);
 602         if (timeout == 0) {
 603                 dev_warn(&indio_dev->dev, "Conversion timed out! Resetting\n");
 604                 if (info->data->init_hw)
 605                         info->data->init_hw(info);
 606                 ret = -ETIMEDOUT;
 607         } else {
 608                 *x = info->ts_x;
 609                 *y = info->ts_y;
 610                 ret = 0;
 611         }
 612
 613         info->read_ts = false;
 614         mutex_unlock(&info->lock);
 615
 616         return ret;
 617 }
 618
 619 static irqreturn_t exynos_adc_isr(int irq, void *dev_id)
 620 {
 621         struct exynos_adc *info = dev_id;
 622         u32 mask = info->data->mask;
 623
 624         /* Read value */
 625         if (info->read_ts) {
 626                 info->ts_x = readl(ADC_V1_DATX(info->regs));
 627                 info->ts_y = readl(ADC_V1_DATY(info->regs));
 628                 writel(ADC_TSC_WAIT4INT | ADC_S3C2443_TSC_UD_SEN, ADC_V1_TSC(info->regs));
 629         } else {
 630                 info->value = readl(ADC_V1_DATX(info->regs)) & mask;
 631         }
 632
 633         /* clear irq */
 634         if (info->data->clear_irq)
 635                 info->data->clear_irq(info);
 636
 637         complete(&info->completion);
 638
 639         return IRQ_HANDLED;
 640 }
 641
 642 /*
 643  * Here we (ab)use a threaded interrupt handler to stay running
 644  * for as long as the touchscreen remains pressed, we report
 645  * a new event with the latest data and then sleep until the
 646  * next timer tick. This mirrors the behavior of the old
 647  * driver, with much less code.
 648  */
 649 static irqreturn_t exynos_ts_isr(int irq, void *dev_id)
 650 {
 651         struct exynos_adc *info = dev_id;
 652         struct iio_dev *dev = dev_get_drvdata(info->dev);
 653         u32 x, y;
 654         bool pressed;
 655         int ret;
 656
 657         while (READ_ONCE(info->ts_enabled)) {
 658                 ret = exynos_read_s3c64xx_ts(dev, &x, &y);
 659                 if (ret == -ETIMEDOUT)
 660                         break;
 661
 662                 pressed = x & y & ADC_DATX_PRESSED;
 663                 if (!pressed) {
 664                         input_report_key(info->input, BTN_TOUCH, 0);
 665                         input_sync(info->input);
 666                         break;
 667                 }
 668
 669                 input_report_abs(info->input, ABS_X, x & ADC_DATX_MASK);
 670                 input_report_abs(info->input, ABS_Y, y & ADC_DATY_MASK);
 671                 input_report_key(info->input, BTN_TOUCH, 1);
 672                 input_sync(info->input);
 673
 674                 usleep_range(1000, 1100);
 675         }
 676
 677         writel(0, ADC_V1_CLRINTPNDNUP(info->regs));
 678
 679         return IRQ_HANDLED;
 680 }
 681
 682 static int exynos_adc_reg_access(struct iio_dev *indio_dev,
 683                               unsigned reg, unsigned writeval,
 684                               unsigned *readval)
 685 {
 686         struct exynos_adc *info = iio_priv(indio_dev);
 687
 688         if (readval == NULL)
 689                 return -EINVAL;
 690
 691         *readval = readl(info->regs + reg);
 692
 693         return 0;
 694 }
 695
 696 static const struct iio_info exynos_adc_iio_info = {
 697         .read_raw = &exynos_read_raw,
 698         .debugfs_reg_access = &exynos_adc_reg_access,
 699 };
 700
 701 #define ADC_CHANNEL(_index, _id) {                      \
 702         .type = IIO_VOLTAGE,                            \
 703         .indexed = 1,                                   \
 704         .channel = _index,                              \
 705         .address = _index,                              \
 706         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),   \
 707         .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SCALE),    \
 708         .datasheet_name = _id,                          \
 709 }
 710
 711 static const struct iio_chan_spec exynos_adc_iio_channels[] = {
 712         ADC_CHANNEL(0, "adc0"),
 713         ADC_CHANNEL(1, "adc1"),
 714         ADC_CHANNEL(2, "adc2"),
 715         ADC_CHANNEL(3, "adc3"),
 716         ADC_CHANNEL(4, "adc4"),
 717         ADC_CHANNEL(5, "adc5"),
 718         ADC_CHANNEL(6, "adc6"),
 719         ADC_CHANNEL(7, "adc7"),
 720         ADC_CHANNEL(8, "adc8"),
 721         ADC_CHANNEL(9, "adc9"),
 722 };
 723
 724 static int exynos_adc_remove_devices(struct device *dev, void *c)
 725 {
 726         struct platform_device *pdev = to_platform_device(dev);
 727
 728         platform_device_unregister(pdev);
 729
 730         return 0;
 731 }
 732
 733 static int exynos_adc_ts_open(struct input_dev *dev)
 734 {
 735         struct exynos_adc *info = input_get_drvdata(dev);
 736
 737         WRITE_ONCE(info->ts_enabled, true);
 738         enable_irq(info->tsirq);
 739
 740         return 0;
 741 }
 742
 743 static void exynos_adc_ts_close(struct input_dev *dev)
 744 {
 745         struct exynos_adc *info = input_get_drvdata(dev);
 746
 747         WRITE_ONCE(info->ts_enabled, false);
 748         disable_irq(info->tsirq);
 749 }
 750
 751 static int exynos_adc_ts_init(struct exynos_adc *info)
 752 {
 753         int ret;
 754
 755         if (info->tsirq <= 0)
 756                 return -ENODEV;
 757
 758         info->input = input_allocate_device();
 759         if (!info->input)
 760                 return -ENOMEM;
 761
 762         info->input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 763         info->input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 764
 765         input_set_abs_params(info->input, ABS_X, 0, 0x3FF, 0, 0);
 766         input_set_abs_params(info->input, ABS_Y, 0, 0x3FF, 0, 0);
 767
 768         info->input->name = "S3C24xx TouchScreen";
 769         info->input->id.bustype = BUS_HOST;
 770         info->input->open = exynos_adc_ts_open;
 771         info->input->close = exynos_adc_ts_close;
 772
 773         input_set_drvdata(info->input, info);
 774
 775         ret = input_register_device(info->input);
 776         if (ret) {
 777                 input_free_device(info->input);
 778                 return ret;
 779         }
 780
 781         ret = request_threaded_irq(info->tsirq, NULL, exynos_ts_isr,
 782                                    IRQF_ONESHOT | IRQF_NO_AUTOEN,
 783                                    "touchscreen", info);
 784         if (ret)
 785                 input_unregister_device(info->input);
 786
 787         return ret;
 788 }
 789
 790 static int exynos_adc_probe(struct platform_device *pdev)
 791 {
 792         struct exynos_adc *info = NULL;
 793         struct device_node *np = pdev->dev.of_node;
 794         struct s3c2410_ts_mach_info *pdata = dev_get_platdata(&pdev->dev);
 795         struct iio_dev *indio_dev = NULL;
 796         bool has_ts = false;
 797         int ret;
 798         int irq;
 799
 800         indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct exynos_adc));
 801         if (!indio_dev) {
 802                 dev_err(&pdev->dev, "failed allocating iio device\n");
 803                 return -ENOMEM;
 804         }
 805
 806         info = iio_priv(indio_dev);
 807
 808         info->data = exynos_adc_get_data(pdev);
 809         if (!info->data) {
 810                 dev_err(&pdev->dev, "failed getting exynos_adc_data\n");
 811                 return -EINVAL;
 812         }
 813
 814         info->regs = devm_platform_ioremap_resource(pdev, 0);
 815         if (IS_ERR(info->regs))
 816                 return PTR_ERR(info->regs);
 817
 818
 819         if (info->data->needs_adc_phy) {
 820                 info->pmu_map = syscon_regmap_lookup_by_phandle(
 821                                         pdev->dev.of_node,
 822                                         "samsung,syscon-phandle");
 823                 if (IS_ERR(info->pmu_map)) {
 824                         dev_err(&pdev->dev, "syscon regmap lookup failed.\n");
 825                         return PTR_ERR(info->pmu_map);
 826                 }
 827         }
 828
 829         irq = platform_get_irq(pdev, 0);
 830         if (irq < 0)
 831                 return irq;
 832         info->irq = irq;
 833
 834         irq = platform_get_irq(pdev, 1);
 835         if (irq == -EPROBE_DEFER)
 836                 return irq;
 837
 838         info->tsirq = irq;
 839
 840         info->dev = &pdev->dev;
 841
 842         init_completion(&info->completion);
 843
 844         info->clk = devm_clk_get(&pdev->dev, "adc");
 845         if (IS_ERR(info->clk)) {
 846                 dev_err(&pdev->dev, "failed getting clock, err = %ld\n",
 847                                                         PTR_ERR(info->clk));
 848                 return PTR_ERR(info->clk);
 849         }
 850
 851         if (info->data->needs_sclk) {
 852                 info->sclk = devm_clk_get(&pdev->dev, "sclk");
 853                 if (IS_ERR(info->sclk)) {
 854                         dev_err(&pdev->dev,
 855                                 "failed getting sclk clock, err = %ld\n",
 856                                 PTR_ERR(info->sclk));
 857                         return PTR_ERR(info->sclk);
 858                 }
 859         }
 860
 861         info->vdd = devm_regulator_get(&pdev->dev, "vdd");
 862         if (IS_ERR(info->vdd))
 863                 return dev_err_probe(&pdev->dev, PTR_ERR(info->vdd),
 864                                      "failed getting regulator");
 865
 866         ret = regulator_enable(info->vdd);
 867         if (ret)
 868                 return ret;
 869
 870         ret = exynos_adc_prepare_clk(info);
 871         if (ret)
 872                 goto err_disable_reg;
 873
 874         ret = exynos_adc_enable_clk(info);
 875         if (ret)
 876                 goto err_unprepare_clk;
 877
 878         platform_set_drvdata(pdev, indio_dev);
 879
 880         indio_dev->name = dev_name(&pdev->dev);
 881         indio_dev->info = &exynos_adc_iio_info;
 882         indio_dev->modes = INDIO_DIRECT_MODE;
 883         indio_dev->channels = exynos_adc_iio_channels;
 884         indio_dev->num_channels = info->data->num_channels;
 885
 886         mutex_init(&info->lock);
 887
 888         ret = request_irq(info->irq, exynos_adc_isr,
 889                                         0, dev_name(&pdev->dev), info);
 890         if (ret < 0) {
 891                 dev_err(&pdev->dev, "failed requesting irq, irq = %d\n",
 892                                                         info->irq);
 893                 goto err_disable_clk;
 894         }
 895
 896         ret = iio_device_register(indio_dev);
 897         if (ret)
 898                 goto err_irq;
 899
 900         if (info->data->init_hw)
 901                 info->data->init_hw(info);
 902
 903         /* leave out any TS related code if unreachable */
 904         if (IS_REACHABLE(CONFIG_INPUT)) {
 905                 has_ts = of_property_read_bool(pdev->dev.of_node,
 906                                                "has-touchscreen") || pdata;
 907         }
 908
 909         if (pdata)
 910                 info->delay = pdata->delay;
 911         else
 912                 info->delay = 10000;
 913
 914         if (has_ts)
 915                 ret = exynos_adc_ts_init(info);
 916         if (ret)
 917                 goto err_iio;
 918
 919         ret = of_platform_populate(np, exynos_adc_match, NULL, &indio_dev->dev);
 920         if (ret < 0) {
 921                 dev_err(&pdev->dev, "failed adding child nodes\n");
 922                 goto err_of_populate;
 923         }
 924
 925         return 0;
 926
 927 err_of_populate:
 928         device_for_each_child(&indio_dev->dev, NULL,
 929                                 exynos_adc_remove_devices);
 930         if (has_ts) {
 931                 input_unregister_device(info->input);
 932                 free_irq(info->tsirq, info);
 933         }
 934 err_iio:
 935         iio_device_unregister(indio_dev);
 936 err_irq:
 937         free_irq(info->irq, info);
 938 err_disable_clk:
 939         if (info->data->exit_hw)
 940                 info->data->exit_hw(info);
 941         exynos_adc_disable_clk(info);
 942 err_unprepare_clk:
 943         exynos_adc_unprepare_clk(info);
 944 err_disable_reg:
 945         regulator_disable(info->vdd);
 946         return ret;
 947 }
 948
 949 static int exynos_adc_remove(struct platform_device *pdev)
 950 {
 951         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 952         struct exynos_adc *info = iio_priv(indio_dev);
 953
 954         if (IS_REACHABLE(CONFIG_INPUT) && info->input) {
 955                 free_irq(info->tsirq, info);
 956                 input_unregister_device(info->input);
 957         }
 958         device_for_each_child(&indio_dev->dev, NULL,
 959                                 exynos_adc_remove_devices);
 960         iio_device_unregister(indio_dev);
 961         free_irq(info->irq, info);
 962         if (info->data->exit_hw)
 963                 info->data->exit_hw(info);
 964         exynos_adc_disable_clk(info);
 965         exynos_adc_unprepare_clk(info);
 966         regulator_disable(info->vdd);
 967
 968         return 0;
 969 }
 970
 971 static int exynos_adc_suspend(struct device *dev)
 972 {
 973         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 974         struct exynos_adc *info = iio_priv(indio_dev);
 975
 976         if (info->data->exit_hw)
 977                 info->data->exit_hw(info);
 978         exynos_adc_disable_clk(info);
 979         regulator_disable(info->vdd);
 980
 981         return 0;
 982 }
 983
 984 static int exynos_adc_resume(struct device *dev)
 985 {
 986         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 987         struct exynos_adc *info = iio_priv(indio_dev);
 988         int ret;
 989
 990         ret = regulator_enable(info->vdd);
 991         if (ret)
 992                 return ret;
 993
 994         ret = exynos_adc_enable_clk(info);
 995         if (ret)
 996                 return ret;
 997
 998         if (info->data->init_hw)
 999                 info->data->init_hw(info);
1000
1001         return 0;
1002 }
1003
1004 static DEFINE_SIMPLE_DEV_PM_OPS(exynos_adc_pm_ops, exynos_adc_suspend,
1005                                 exynos_adc_resume);
1006
1007 static struct platform_driver exynos_adc_driver = {
1008         .probe          = exynos_adc_probe,
1009         .remove         = exynos_adc_remove,
1010         .driver         = {
1011                 .name   = "exynos-adc",
1012                 .of_match_table = exynos_adc_match,
1013                 .pm     = pm_sleep_ptr(&exynos_adc_pm_ops),
1014         },
1015 };
1016
1017 module_platform_driver(exynos_adc_driver);
1018
1019 MODULE_AUTHOR("Naveen Krishna Chatradhi <[email protected]>");
1020 MODULE_DESCRIPTION("Samsung EXYNOS5 ADC driver");
1021 MODULE_LICENSE("GPL v2");