drivers/extcon/extcon-arizona.c

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