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                         ret = extcon_set_cable_state_(&info->edev,
 200                                                       ARIZONA_CABLE_HEADPHONE,
 201                                                       true);
 202                         if (ret != 0)
 203                                 dev_err(arizona->dev,
 204                                         "Headphone report failed: %d\n",
 205                                 ret);
 206                 } else {
 207                         info->micd_mode++;
 208                         if (info->micd_mode == info->micd_num_modes)
 209                                 info->micd_mode = 0;
 210                         arizona_extcon_set_mode(info, info->micd_mode);
 211
 212                         info->jack_flips++;
 213                 }
 214
 215                 goto handled;
 216         }
 217
 218         /*
 219          * If we're still detecting and we detect a short then we've
 220          * got a headphone.  Otherwise it's a button press, the
 221          * button reporting is stubbed out for now.
 222          */
 223         if (val & 0x3fc) {
 224                 if (info->mic) {
 225                         dev_dbg(arizona->dev, "Mic button detected\n");
 226
 227                 } else if (info->detecting) {
 228                         dev_dbg(arizona->dev, "Headphone detected\n");
 229                         info->detecting = false;
 230                         arizona_stop_mic(info);
 231
 232                         ret = extcon_set_cable_state_(&info->edev,
 233                                                       ARIZONA_CABLE_HEADPHONE,
 234                                                       true);
 235                         if (ret != 0)
 236                                 dev_err(arizona->dev,
 237                                         "Headphone report failed: %d\n",
 238                                 ret);
 239                 } else {
 240                         dev_warn(arizona->dev, "Button with no mic: %x\n",
 241                                  val);
 242                 }
 243         } else {
 244                 dev_dbg(arizona->dev, "Mic button released\n");
 245         }
 246
 247 handled:
 248         pm_runtime_mark_last_busy(info->dev);
 249         mutex_unlock(&info->lock);
 250
 251         return IRQ_HANDLED;
 252 }
 253
 254 static irqreturn_t arizona_jackdet(int irq, void *data)
 255 {
 256         struct arizona_extcon_info *info = data;
 257         struct arizona *arizona = info->arizona;
 258         unsigned int val;
 259         int ret;
 260
 261         pm_runtime_get_sync(info->dev);
 262
 263         mutex_lock(&info->lock);
 264
 265         ret = regmap_read(arizona->regmap, ARIZONA_AOD_IRQ_RAW_STATUS, &val);
 266         if (ret != 0) {
 267                 dev_err(arizona->dev, "Failed to read jackdet status: %d\n",
 268                         ret);
 269                 mutex_unlock(&info->lock);
 270                 pm_runtime_put_autosuspend(info->dev);
 271                 return IRQ_NONE;
 272         }
 273
 274         if (val & ARIZONA_JD1_STS) {
 275                 dev_dbg(arizona->dev, "Detected jack\n");
 276                 ret = extcon_set_cable_state_(&info->edev,
 277                                               ARIZONA_CABLE_MECHANICAL, true);
 278
 279                 if (ret != 0)
 280                         dev_err(arizona->dev, "Mechanical report failed: %d\n",
 281                                 ret);
 282
 283                 arizona_start_mic(info);
 284         } else {
 285                 dev_dbg(arizona->dev, "Detected jack removal\n");
 286
 287                 arizona_stop_mic(info);
 288
 289                 ret = extcon_update_state(&info->edev, 0xffffffff, 0);
 290                 if (ret != 0)
 291                         dev_err(arizona->dev, "Removal report failed: %d\n",
 292                                 ret);
 293         }
 294
 295         mutex_unlock(&info->lock);
 296
 297         pm_runtime_mark_last_busy(info->dev);
 298         pm_runtime_put_autosuspend(info->dev);
 299
 300         return IRQ_HANDLED;
 301 }
 302
 303 static int __devinit arizona_extcon_probe(struct platform_device *pdev)
 304 {
 305         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
 306         struct arizona_pdata *pdata;
 307         struct arizona_extcon_info *info;
 308         int ret, mode;
 309
 310         pdata = dev_get_platdata(arizona->dev);
 311
 312         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 313         if (!info) {
 314                 dev_err(&pdev->dev, "failed to allocate memory\n");
 315                 ret = -ENOMEM;
 316                 goto err;
 317         }
 318
 319         info->micvdd = devm_regulator_get(arizona->dev, "MICVDD");
 320         if (IS_ERR(info->micvdd)) {
 321                 ret = PTR_ERR(info->micvdd);
 322                 dev_err(arizona->dev, "Failed to get MICVDD: %d\n", ret);
 323                 goto err;
 324         }
 325
 326         mutex_init(&info->lock);
 327         info->arizona = arizona;
 328         info->dev = &pdev->dev;
 329         info->detecting = true;
 330         platform_set_drvdata(pdev, info);
 331
 332         switch (arizona->type) {
 333         case WM5102:
 334                 switch (arizona->rev) {
 335                 case 0:
 336                         info->micd_reva = true;
 337                         break;
 338                 default:
 339                         break;
 340                 }
 341                 break;
 342         default:
 343                 break;
 344         }
 345
 346         info->edev.name = "Headset Jack";
 347         info->edev.supported_cable = arizona_cable;
 348
 349         ret = extcon_dev_register(&info->edev, arizona->dev);
 350         if (ret < 0) {
 351                 dev_err(arizona->dev, "extcon_dev_regster() failed: %d\n",
 352                         ret);
 353                 goto err;
 354         }
 355
 356         if (pdata->num_micd_configs) {
 357                 info->micd_modes = pdata->micd_configs;
 358                 info->micd_num_modes = pdata->num_micd_configs;
 359         } else {
 360                 info->micd_modes = micd_default_modes;
 361                 info->micd_num_modes = ARRAY_SIZE(micd_default_modes);
 362         }
 363
 364         if (arizona->pdata.micd_pol_gpio > 0) {
 365                 if (info->micd_modes[0].gpio)
 366                         mode = GPIOF_OUT_INIT_HIGH;
 367                 else
 368                         mode = GPIOF_OUT_INIT_LOW;
 369
 370                 ret = devm_gpio_request_one(&pdev->dev,
 371                                             arizona->pdata.micd_pol_gpio,
 372                                             mode,
 373                                             "MICD polarity");
 374                 if (ret != 0) {
 375                         dev_err(arizona->dev, "Failed to request GPIO%d: %d\n",
 376                                 arizona->pdata.micd_pol_gpio, ret);
 377                         goto err_register;
 378                 }
 379         }
 380
 381         arizona_extcon_set_mode(info, 0);
 382
 383         pm_runtime_enable(&pdev->dev);
 384         pm_runtime_idle(&pdev->dev);
 385         pm_runtime_get_sync(&pdev->dev);
 386
 387         ret = arizona_request_irq(arizona, ARIZONA_IRQ_JD_RISE,
 388                                   "JACKDET rise", arizona_jackdet, info);
 389         if (ret != 0) {
 390                 dev_err(&pdev->dev, "Failed to get JACKDET rise IRQ: %d\n",
 391                         ret);
 392                 goto err_register;
 393         }
 394
 395         ret = arizona_set_irq_wake(arizona, ARIZONA_IRQ_JD_RISE, 1);
 396         if (ret != 0) {
 397                 dev_err(&pdev->dev, "Failed to set JD rise IRQ wake: %d\n",
 398                         ret);
 399                 goto err_rise;
 400         }
 401
 402         ret = arizona_request_irq(arizona, ARIZONA_IRQ_JD_FALL,
 403                                   "JACKDET fall", arizona_jackdet, info);
 404         if (ret != 0) {
 405                 dev_err(&pdev->dev, "Failed to get JD fall IRQ: %d\n", ret);
 406                 goto err_rise_wake;
 407         }
 408
 409         ret = arizona_set_irq_wake(arizona, ARIZONA_IRQ_JD_FALL, 1);
 410         if (ret != 0) {
 411                 dev_err(&pdev->dev, "Failed to set JD fall IRQ wake: %d\n",
 412                         ret);
 413                 goto err_fall;
 414         }
 415
 416         ret = arizona_request_irq(arizona, ARIZONA_IRQ_MICDET,
 417                                   "MICDET", arizona_micdet, info);
 418         if (ret != 0) {
 419                 dev_err(&pdev->dev, "Failed to get MICDET IRQ: %d\n", ret);
 420                 goto err_fall_wake;
 421         }
 422
 423         regmap_update_bits(arizona->regmap, ARIZONA_MIC_DETECT_1,
 424                            ARIZONA_MICD_BIAS_STARTTIME_MASK |
 425                            ARIZONA_MICD_RATE_MASK,
 426                            7 << ARIZONA_MICD_BIAS_STARTTIME_SHIFT |
 427                            8 << ARIZONA_MICD_RATE_SHIFT);
 428
 429         arizona_clk32k_enable(arizona);
 430         regmap_update_bits(arizona->regmap, ARIZONA_JACK_DETECT_DEBOUNCE,
 431                            ARIZONA_JD1_DB, ARIZONA_JD1_DB);
 432         regmap_update_bits(arizona->regmap, ARIZONA_JACK_DETECT_ANALOGUE,
 433                            ARIZONA_JD1_ENA, ARIZONA_JD1_ENA);
 434
 435         pm_runtime_put(&pdev->dev);
 436
 437         return 0;
 438
 439 err_fall_wake:
 440         arizona_set_irq_wake(arizona, ARIZONA_IRQ_JD_FALL, 0);
 441 err_fall:
 442         arizona_free_irq(arizona, ARIZONA_IRQ_JD_FALL, info);
 443 err_rise_wake:
 444         arizona_set_irq_wake(arizona, ARIZONA_IRQ_JD_RISE, 0);
 445 err_rise:
 446         arizona_free_irq(arizona, ARIZONA_IRQ_JD_RISE, info);
 447 err_register:
 448         pm_runtime_disable(&pdev->dev);
 449         extcon_dev_unregister(&info->edev);
 450 err:
 451         return ret;
 452 }
 453
 454 static int __devexit arizona_extcon_remove(struct platform_device *pdev)
 455 {
 456         struct arizona_extcon_info *info = platform_get_drvdata(pdev);
 457         struct arizona *arizona = info->arizona;
 458
 459         pm_runtime_disable(&pdev->dev);
 460
 461         arizona_set_irq_wake(arizona, ARIZONA_IRQ_JD_RISE, 0);
 462         arizona_set_irq_wake(arizona, ARIZONA_IRQ_JD_FALL, 0);
 463         arizona_free_irq(arizona, ARIZONA_IRQ_MICDET, info);
 464         arizona_free_irq(arizona, ARIZONA_IRQ_JD_RISE, info);
 465         arizona_free_irq(arizona, ARIZONA_IRQ_JD_FALL, info);
 466         regmap_update_bits(arizona->regmap, ARIZONA_JACK_DETECT_ANALOGUE,
 467                            ARIZONA_JD1_ENA, 0);
 468         arizona_clk32k_disable(arizona);
 469         extcon_dev_unregister(&info->edev);
 470
 471         return 0;
 472 }
 473
 474 static struct platform_driver arizona_extcon_driver = {
 475         .driver         = {
 476                 .name   = "arizona-extcon",
 477                 .owner  = THIS_MODULE,
 478         },
 479         .probe          = arizona_extcon_probe,
 480         .remove         = __devexit_p(arizona_extcon_remove),
 481 };
 482
 483 module_platform_driver(arizona_extcon_driver);
 484
 485 MODULE_DESCRIPTION("Arizona Extcon driver");
 486 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 487 MODULE_LICENSE("GPL");
 488 MODULE_ALIAS("platform:extcon-arizona");