linux/drivers/extcon/extcon-arizona.c
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   1/*
   2 * extcon-arizona.c - Extcon driver Wolfson Arizona devices
   3 *
   4 *  Copyright (C) 2012 Wolfson Microelectronics plc
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation; either version 2 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 */
  16
  17#include <linux/kernel.h>
  18#include <linux/module.h>
  19#include <linux/i2c.h>
  20#include <linux/slab.h>
  21#include <linux/interrupt.h>
  22#include <linux/err.h>
  23#include <linux/gpio.h>
  24#include <linux/input.h>
  25#include <linux/platform_device.h>
  26#include <linux/pm_runtime.h>
  27#include <linux/regulator/consumer.h>
  28#include <linux/extcon.h>
  29
  30#include <linux/mfd/arizona/core.h>
  31#include <linux/mfd/arizona/pdata.h>
  32#include <linux/mfd/arizona/registers.h>
  33
  34#define ARIZONA_NUM_BUTTONS 6
  35
  36struct arizona_extcon_info {
  37        struct device *dev;
  38        struct arizona *arizona;
  39        struct mutex lock;
  40        struct regulator *micvdd;
  41        struct input_dev *input;
  42
  43        int micd_mode;
  44        const struct arizona_micd_config *micd_modes;
  45        int micd_num_modes;
  46
  47        bool micd_reva;
  48
  49        bool mic;
  50        bool detecting;
  51        int jack_flips;
  52
  53        struct extcon_dev edev;
  54};
  55
  56static const struct arizona_micd_config micd_default_modes[] = {
  57        { ARIZONA_ACCDET_SRC, 1 << ARIZONA_MICD_BIAS_SRC_SHIFT, 0 },
  58        { 0,                  2 << ARIZONA_MICD_BIAS_SRC_SHIFT, 1 },
  59};
  60
  61static struct {
  62        u16 status;
  63        int report;
  64} arizona_lvl_to_key[ARIZONA_NUM_BUTTONS] = {
  65        {  0x1, BTN_0 },
  66        {  0x2, BTN_1 },
  67        {  0x4, BTN_2 },
  68        {  0x8, BTN_3 },
  69        { 0x10, BTN_4 },
  70        { 0x20, BTN_5 },
  71};
  72
  73#define ARIZONA_CABLE_MECHANICAL 0
  74#define ARIZONA_CABLE_MICROPHONE 1
  75#define ARIZONA_CABLE_HEADPHONE  2
  76
  77static const char *arizona_cable[] = {
  78        "Mechanical",
  79        "Microphone",
  80        "Headphone",
  81        NULL,
  82};
  83
  84static void arizona_extcon_set_mode(struct arizona_extcon_info *info, int mode)
  85{
  86        struct arizona *arizona = info->arizona;
  87
  88        gpio_set_value_cansleep(arizona->pdata.micd_pol_gpio,
  89                                info->micd_modes[mode].gpio);
  90        regmap_update_bits(arizona->regmap, ARIZONA_MIC_DETECT_1,
  91                           ARIZONA_MICD_BIAS_SRC_MASK,
  92                           info->micd_modes[mode].bias);
  93        regmap_update_bits(arizona->regmap, ARIZONA_ACCESSORY_DETECT_MODE_1,
  94                           ARIZONA_ACCDET_SRC, info->micd_modes[mode].src);
  95
  96        info->micd_mode = mode;
  97
  98        dev_dbg(arizona->dev, "Set jack polarity to %d\n", mode);
  99}
 100
 101static void arizona_start_mic(struct arizona_extcon_info *info)
 102{
 103        struct arizona *arizona = info->arizona;
 104        bool change;
 105        int ret;
 106
 107        info->detecting = true;
 108        info->mic = false;
 109        info->jack_flips = 0;
 110
 111        /* Microphone detection can't use idle mode */
 112        pm_runtime_get(info->dev);
 113
 114        ret = regulator_enable(info->micvdd);
 115        if (ret != 0) {
 116                dev_err(arizona->dev, "Failed to enable MICVDD: %d\n",
 117                        ret);
 118        }
 119
 120        if (info->micd_reva) {
 121                regmap_write(arizona->regmap, 0x80, 0x3);
 122                regmap_write(arizona->regmap, 0x294, 0);
 123                regmap_write(arizona->regmap, 0x80, 0x0);
 124        }
 125
 126        regmap_update_bits_check(arizona->regmap, ARIZONA_MIC_DETECT_1,
 127                                 ARIZONA_MICD_ENA, ARIZONA_MICD_ENA,
 128                                 &change);
 129        if (!change) {
 130                regulator_disable(info->micvdd);
 131                pm_runtime_put_autosuspend(info->dev);
 132        }
 133}
 134
 135static void arizona_stop_mic(struct arizona_extcon_info *info)
 136{
 137        struct arizona *arizona = info->arizona;
 138        bool change;
 139
 140        regmap_update_bits_check(arizona->regmap, ARIZONA_MIC_DETECT_1,
 141                                 ARIZONA_MICD_ENA, 0,
 142                                 &change);
 143
 144        if (info->micd_reva) {
 145                regmap_write(arizona->regmap, 0x80, 0x3);
 146                regmap_write(arizona->regmap, 0x294, 2);
 147                regmap_write(arizona->regmap, 0x80, 0x0);
 148        }
 149
 150        if (change) {
 151                regulator_disable(info->micvdd);
 152                pm_runtime_mark_last_busy(info->dev);
 153                pm_runtime_put_autosuspend(info->dev);
 154        }
 155}
 156
 157static irqreturn_t arizona_micdet(int irq, void *data)
 158{
 159        struct arizona_extcon_info *info = data;
 160        struct arizona *arizona = info->arizona;
 161        unsigned int val, lvl;
 162        int ret, i;
 163
 164        mutex_lock(&info->lock);
 165
 166        ret = regmap_read(arizona->regmap, ARIZONA_MIC_DETECT_3, &val);
 167        if (ret != 0) {
 168                dev_err(arizona->dev, "Failed to read MICDET: %d\n", ret);
 169                mutex_unlock(&info->lock);
 170                return IRQ_NONE;
 171        }
 172
 173        dev_dbg(arizona->dev, "MICDET: %x\n", val);
 174
 175        if (!(val & ARIZONA_MICD_VALID)) {
 176                dev_warn(arizona->dev, "Microphone detection state invalid\n");
 177                mutex_unlock(&info->lock);
 178                return IRQ_NONE;
 179        }
 180
 181        /* Due to jack detect this should never happen */
 182        if (!(val & ARIZONA_MICD_STS)) {
 183                dev_warn(arizona->dev, "Detected open circuit\n");
 184                info->detecting = false;
 185                goto handled;
 186        }
 187
 188        /* If we got a high impedence we should have a headset, report it. */
 189        if (info->detecting && (val & 0x400)) {
 190                ret = extcon_update_state(&info->edev,
 191                                          1 << ARIZONA_CABLE_MICROPHONE |
 192                                          1 << ARIZONA_CABLE_HEADPHONE,
 193                                          1 << ARIZONA_CABLE_MICROPHONE |
 194                                          1 << ARIZONA_CABLE_HEADPHONE);
 195
 196                if (ret != 0)
 197                        dev_err(arizona->dev, "Headset report failed: %d\n",
 198                                ret);
 199
 200                info->mic = true;
 201                info->detecting = false;
 202                goto handled;
 203        }
 204
 205        /* If we detected a lower impedence during initial startup
 206         * then we probably have the wrong polarity, flip it.  Don't
 207         * do this for the lowest impedences to speed up detection of
 208         * plain headphones.  If both polarities report a low
 209         * impedence then give up and report headphones.
 210         */
 211        if (info->detecting && (val & 0x3f8)) {
 212                info->jack_flips++;
 213
 214                if (info->jack_flips >= info->micd_num_modes) {
 215                        dev_dbg(arizona->dev, "Detected headphone\n");
 216                        info->detecting = false;
 217                        arizona_stop_mic(info);
 218
 219                        ret = extcon_set_cable_state_(&info->edev,
 220                                                      ARIZONA_CABLE_HEADPHONE,
 221                                                      true);
 222                        if (ret != 0)
 223                                dev_err(arizona->dev,
 224                                        "Headphone report failed: %d\n",
 225                                ret);
 226                } else {
 227                        info->micd_mode++;
 228                        if (info->micd_mode == info->micd_num_modes)
 229                                info->micd_mode = 0;
 230                        arizona_extcon_set_mode(info, info->micd_mode);
 231
 232                        info->jack_flips++;
 233                }
 234
 235                goto handled;
 236        }
 237
 238        /*
 239         * If we're still detecting and we detect a short then we've
 240         * got a headphone.  Otherwise it's a button press.
 241         */
 242        if (val & 0x3fc) {
 243                if (info->mic) {
 244                        dev_dbg(arizona->dev, "Mic button detected\n");
 245
 246                        lvl = val & ARIZONA_MICD_LVL_MASK;
 247                        lvl >>= ARIZONA_MICD_LVL_SHIFT;
 248
 249                        for (i = 0; i < ARIZONA_NUM_BUTTONS; i++)
 250                                if (lvl & arizona_lvl_to_key[i].status)
 251                                        input_report_key(info->input,
 252                                                         arizona_lvl_to_key[i].report,
 253                                                         1);
 254                        input_sync(info->input);
 255
 256                } else if (info->detecting) {
 257                        dev_dbg(arizona->dev, "Headphone detected\n");
 258                        info->detecting = false;
 259                        arizona_stop_mic(info);
 260
 261                        ret = extcon_set_cable_state_(&info->edev,
 262                                                      ARIZONA_CABLE_HEADPHONE,
 263                                                      true);
 264                        if (ret != 0)
 265                                dev_err(arizona->dev,
 266                                        "Headphone report failed: %d\n",
 267                                ret);
 268                } else {
 269                        dev_warn(arizona->dev, "Button with no mic: %x\n",
 270                                 val);
 271                }
 272        } else {
 273                dev_dbg(arizona->dev, "Mic button released\n");
 274                for (i = 0; i < ARIZONA_NUM_BUTTONS; i++)
 275                        input_report_key(info->input,
 276                                         arizona_lvl_to_key[i].report, 0);
 277                input_sync(info->input);
 278        }
 279
 280handled:
 281        pm_runtime_mark_last_busy(info->dev);
 282        mutex_unlock(&info->lock);
 283
 284        return IRQ_HANDLED;
 285}
 286
 287static irqreturn_t arizona_jackdet(int irq, void *data)
 288{
 289        struct arizona_extcon_info *info = data;
 290        struct arizona *arizona = info->arizona;
 291        unsigned int val;
 292        int ret, i;
 293
 294        pm_runtime_get_sync(info->dev);
 295
 296        mutex_lock(&info->lock);
 297
 298        ret = regmap_read(arizona->regmap, ARIZONA_AOD_IRQ_RAW_STATUS, &val);
 299        if (ret != 0) {
 300                dev_err(arizona->dev, "Failed to read jackdet status: %d\n",
 301                        ret);
 302                mutex_unlock(&info->lock);
 303                pm_runtime_put_autosuspend(info->dev);
 304                return IRQ_NONE;
 305        }
 306
 307        if (val & ARIZONA_JD1_STS) {
 308                dev_dbg(arizona->dev, "Detected jack\n");
 309                ret = extcon_set_cable_state_(&info->edev,
 310                                              ARIZONA_CABLE_MECHANICAL, true);
 311
 312                if (ret != 0)
 313                        dev_err(arizona->dev, "Mechanical report failed: %d\n",
 314                                ret);
 315
 316                arizona_start_mic(info);
 317        } else {
 318                dev_dbg(arizona->dev, "Detected jack removal\n");
 319
 320                arizona_stop_mic(info);
 321
 322                for (i = 0; i < ARIZONA_NUM_BUTTONS; i++)
 323                        input_report_key(info->input,
 324                                         arizona_lvl_to_key[i].report, 0);
 325                input_sync(info->input);
 326
 327                ret = extcon_update_state(&info->edev, 0xffffffff, 0);
 328                if (ret != 0)
 329                        dev_err(arizona->dev, "Removal report failed: %d\n",
 330                                ret);
 331        }
 332
 333        mutex_unlock(&info->lock);
 334
 335        pm_runtime_mark_last_busy(info->dev);
 336        pm_runtime_put_autosuspend(info->dev);
 337
 338        return IRQ_HANDLED;
 339}
 340
 341static int arizona_extcon_probe(struct platform_device *pdev)
 342{
 343        struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
 344        struct arizona_pdata *pdata;
 345        struct arizona_extcon_info *info;
 346        int ret, mode, i;
 347
 348        pdata = dev_get_platdata(arizona->dev);
 349
 350        info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 351        if (!info) {
 352                dev_err(&pdev->dev, "Failed to allocate memory\n");
 353                ret = -ENOMEM;
 354                goto err;
 355        }
 356
 357        info->micvdd = devm_regulator_get(arizona->dev, "MICVDD");
 358        if (IS_ERR(info->micvdd)) {
 359                ret = PTR_ERR(info->micvdd);
 360                dev_err(arizona->dev, "Failed to get MICVDD: %d\n", ret);
 361                goto err;
 362        }
 363
 364        mutex_init(&info->lock);
 365        info->arizona = arizona;
 366        info->dev = &pdev->dev;
 367        info->detecting = true;
 368        platform_set_drvdata(pdev, info);
 369
 370        switch (arizona->type) {
 371        case WM5102:
 372                switch (arizona->rev) {
 373                case 0:
 374                        info->micd_reva = true;
 375                        break;
 376                default:
 377                        break;
 378                }
 379                break;
 380        default:
 381                break;
 382        }
 383
 384        info->edev.name = "Headset Jack";
 385        info->edev.supported_cable = arizona_cable;
 386
 387        ret = extcon_dev_register(&info->edev, arizona->dev);
 388        if (ret < 0) {
 389                dev_err(arizona->dev, "extcon_dev_register() failed: %d\n",
 390                        ret);
 391                goto err;
 392        }
 393
 394        if (pdata->num_micd_configs) {
 395                info->micd_modes = pdata->micd_configs;
 396                info->micd_num_modes = pdata->num_micd_configs;
 397        } else {
 398                info->micd_modes = micd_default_modes;
 399                info->micd_num_modes = ARRAY_SIZE(micd_default_modes);
 400        }
 401
 402        if (arizona->pdata.micd_pol_gpio > 0) {
 403                if (info->micd_modes[0].gpio)
 404                        mode = GPIOF_OUT_INIT_HIGH;
 405                else
 406                        mode = GPIOF_OUT_INIT_LOW;
 407
 408                ret = devm_gpio_request_one(&pdev->dev,
 409                                            arizona->pdata.micd_pol_gpio,
 410                                            mode,
 411                                            "MICD polarity");
 412                if (ret != 0) {
 413                        dev_err(arizona->dev, "Failed to request GPIO%d: %d\n",
 414                                arizona->pdata.micd_pol_gpio, ret);
 415                        goto err_register;
 416                }
 417        }
 418
 419        arizona_extcon_set_mode(info, 0);
 420
 421        info->input = input_allocate_device();
 422        if (!info->input) {
 423                dev_err(arizona->dev, "Can't allocate input dev\n");
 424                ret = -ENOMEM;
 425                goto err_register;
 426        }
 427
 428        for (i = 0; i < ARIZONA_NUM_BUTTONS; i++)
 429                input_set_capability(info->input, EV_KEY,
 430                                     arizona_lvl_to_key[i].report);
 431        info->input->name = "Headset";
 432        info->input->phys = "arizona/extcon";
 433        info->input->dev.parent = &pdev->dev;
 434
 435        pm_runtime_enable(&pdev->dev);
 436        pm_runtime_idle(&pdev->dev);
 437        pm_runtime_get_sync(&pdev->dev);
 438
 439        ret = arizona_request_irq(arizona, ARIZONA_IRQ_JD_RISE,
 440                                  "JACKDET rise", arizona_jackdet, info);
 441        if (ret != 0) {
 442                dev_err(&pdev->dev, "Failed to get JACKDET rise IRQ: %d\n",
 443                        ret);
 444                goto err_input;
 445        }
 446
 447        ret = arizona_set_irq_wake(arizona, ARIZONA_IRQ_JD_RISE, 1);
 448        if (ret != 0) {
 449                dev_err(&pdev->dev, "Failed to set JD rise IRQ wake: %d\n",
 450                        ret);
 451                goto err_rise;
 452        }
 453
 454        ret = arizona_request_irq(arizona, ARIZONA_IRQ_JD_FALL,
 455                                  "JACKDET fall", arizona_jackdet, info);
 456        if (ret != 0) {
 457                dev_err(&pdev->dev, "Failed to get JD fall IRQ: %d\n", ret);
 458                goto err_rise_wake;
 459        }
 460
 461        ret = arizona_set_irq_wake(arizona, ARIZONA_IRQ_JD_FALL, 1);
 462        if (ret != 0) {
 463                dev_err(&pdev->dev, "Failed to set JD fall IRQ wake: %d\n",
 464                        ret);
 465                goto err_fall;
 466        }
 467
 468        ret = arizona_request_irq(arizona, ARIZONA_IRQ_MICDET,
 469                                  "MICDET", arizona_micdet, info);
 470        if (ret != 0) {
 471                dev_err(&pdev->dev, "Failed to get MICDET IRQ: %d\n", ret);
 472                goto err_fall_wake;
 473        }
 474
 475        regmap_update_bits(arizona->regmap, ARIZONA_MIC_DETECT_1,
 476                           ARIZONA_MICD_BIAS_STARTTIME_MASK |
 477                           ARIZONA_MICD_RATE_MASK,
 478                           7 << ARIZONA_MICD_BIAS_STARTTIME_SHIFT |
 479                           8 << ARIZONA_MICD_RATE_SHIFT);
 480
 481        arizona_clk32k_enable(arizona);
 482        regmap_update_bits(arizona->regmap, ARIZONA_JACK_DETECT_DEBOUNCE,
 483                           ARIZONA_JD1_DB, ARIZONA_JD1_DB);
 484        regmap_update_bits(arizona->regmap, ARIZONA_JACK_DETECT_ANALOGUE,
 485                           ARIZONA_JD1_ENA, ARIZONA_JD1_ENA);
 486
 487        ret = regulator_allow_bypass(info->micvdd, true);
 488        if (ret != 0)
 489                dev_warn(arizona->dev, "Failed to set MICVDD to bypass: %d\n",
 490                         ret);
 491
 492        pm_runtime_put(&pdev->dev);
 493
 494        ret = input_register_device(info->input);
 495        if (ret) {
 496                dev_err(&pdev->dev, "Can't register input device: %d\n", ret);
 497                goto err_micdet;
 498        }
 499
 500        return 0;
 501
 502err_micdet:
 503        arizona_free_irq(arizona, ARIZONA_IRQ_MICDET, info);
 504err_fall_wake:
 505        arizona_set_irq_wake(arizona, ARIZONA_IRQ_JD_FALL, 0);
 506err_fall:
 507        arizona_free_irq(arizona, ARIZONA_IRQ_JD_FALL, info);
 508err_rise_wake:
 509        arizona_set_irq_wake(arizona, ARIZONA_IRQ_JD_RISE, 0);
 510err_rise:
 511        arizona_free_irq(arizona, ARIZONA_IRQ_JD_RISE, info);
 512err_input:
 513        input_free_device(info->input);
 514err_register:
 515        pm_runtime_disable(&pdev->dev);
 516        extcon_dev_unregister(&info->edev);
 517err:
 518        return ret;
 519}
 520
 521static int arizona_extcon_remove(struct platform_device *pdev)
 522{
 523        struct arizona_extcon_info *info = platform_get_drvdata(pdev);
 524        struct arizona *arizona = info->arizona;
 525
 526        pm_runtime_disable(&pdev->dev);
 527
 528        arizona_set_irq_wake(arizona, ARIZONA_IRQ_JD_RISE, 0);
 529        arizona_set_irq_wake(arizona, ARIZONA_IRQ_JD_FALL, 0);
 530        arizona_free_irq(arizona, ARIZONA_IRQ_MICDET, info);
 531        arizona_free_irq(arizona, ARIZONA_IRQ_JD_RISE, info);
 532        arizona_free_irq(arizona, ARIZONA_IRQ_JD_FALL, info);
 533        regmap_update_bits(arizona->regmap, ARIZONA_JACK_DETECT_ANALOGUE,
 534                           ARIZONA_JD1_ENA, 0);
 535        arizona_clk32k_disable(arizona);
 536        input_unregister_device(info->input);
 537        extcon_dev_unregister(&info->edev);
 538
 539        return 0;
 540}
 541
 542static struct platform_driver arizona_extcon_driver = {
 543        .driver         = {
 544                .name   = "arizona-extcon",
 545                .owner  = THIS_MODULE,
 546        },
 547        .probe          = arizona_extcon_probe,
 548        .remove         = arizona_extcon_remove,
 549};
 550
 551module_platform_driver(arizona_extcon_driver);
 552
 553MODULE_DESCRIPTION("Arizona Extcon driver");
 554MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 555MODULE_LICENSE("GPL");
 556MODULE_ALIAS("platform:extcon-arizona");
 557
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