drivers/extcon/extcon-max8997.c

   1 /*
   2  * extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC
   3  *
   4  *  Copyright (C) 2012 Samsung Electrnoics
   5  *  Donggeun Kim <[email protected]>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/i2c.h>
  21 #include <linux/slab.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/err.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/kobject.h>
  26 #include <linux/mfd/max8997.h>
  27 #include <linux/mfd/max8997-private.h>
  28 #include <linux/extcon.h>
  29
  30 #define DEV_NAME                        "max8997-muic"
  31
  32 /* MAX8997-MUIC STATUS1 register */
  33 #define STATUS1_ADC_SHIFT               0
  34 #define STATUS1_ADCLOW_SHIFT            5
  35 #define STATUS1_ADCERR_SHIFT            6
  36 #define STATUS1_ADC_MASK                (0x1f << STATUS1_ADC_SHIFT)
  37 #define STATUS1_ADCLOW_MASK             (0x1 << STATUS1_ADCLOW_SHIFT)
  38 #define STATUS1_ADCERR_MASK             (0x1 << STATUS1_ADCERR_SHIFT)
  39
  40 /* MAX8997-MUIC STATUS2 register */
  41 #define STATUS2_CHGTYP_SHIFT            0
  42 #define STATUS2_CHGDETRUN_SHIFT         3
  43 #define STATUS2_DCDTMR_SHIFT            4
  44 #define STATUS2_DBCHG_SHIFT             5
  45 #define STATUS2_VBVOLT_SHIFT            6
  46 #define STATUS2_CHGTYP_MASK             (0x7 << STATUS2_CHGTYP_SHIFT)
  47 #define STATUS2_CHGDETRUN_MASK          (0x1 << STATUS2_CHGDETRUN_SHIFT)
  48 #define STATUS2_DCDTMR_MASK             (0x1 << STATUS2_DCDTMR_SHIFT)
  49 #define STATUS2_DBCHG_MASK              (0x1 << STATUS2_DBCHG_SHIFT)
  50 #define STATUS2_VBVOLT_MASK             (0x1 << STATUS2_VBVOLT_SHIFT)
  51
  52 /* MAX8997-MUIC STATUS3 register */
  53 #define STATUS3_OVP_SHIFT               2
  54 #define STATUS3_OVP_MASK                (0x1 << STATUS3_OVP_SHIFT)
  55
  56 /* MAX8997-MUIC CONTROL1 register */
  57 #define COMN1SW_SHIFT                   0
  58 #define COMP2SW_SHIFT                   3
  59 #define COMN1SW_MASK                    (0x7 << COMN1SW_SHIFT)
  60 #define COMP2SW_MASK                    (0x7 << COMP2SW_SHIFT)
  61 #define SW_MASK                         (COMP2SW_MASK | COMN1SW_MASK)
  62
  63 #define MAX8997_SW_USB          ((1 << COMP2SW_SHIFT) | (1 << COMN1SW_SHIFT))
  64 #define MAX8997_SW_AUDIO        ((2 << COMP2SW_SHIFT) | (2 << COMN1SW_SHIFT))
  65 #define MAX8997_SW_UART         ((3 << COMP2SW_SHIFT) | (3 << COMN1SW_SHIFT))
  66 #define MAX8997_SW_OPEN         ((0 << COMP2SW_SHIFT) | (0 << COMN1SW_SHIFT))
  67
  68 #define MAX8997_ADC_GROUND              0x00
  69 #define MAX8997_ADC_MHL                 0x01
  70 #define MAX8997_ADC_JIG_USB_1           0x18
  71 #define MAX8997_ADC_JIG_USB_2           0x19
  72 #define MAX8997_ADC_DESKDOCK            0x1a
  73 #define MAX8997_ADC_JIG_UART            0x1c
  74 #define MAX8997_ADC_CARDOCK             0x1d
  75 #define MAX8997_ADC_OPEN                0x1f
  76
  77 struct max8997_muic_irq {
  78         unsigned int irq;
  79         const char *name;
  80 };
  81
  82 static struct max8997_muic_irq muic_irqs[] = {
  83         { MAX8997_MUICIRQ_ADCError, "muic-ADC_error" },
  84         { MAX8997_MUICIRQ_ADCLow, "muic-ADC_low" },
  85         { MAX8997_MUICIRQ_ADC, "muic-ADC" },
  86         { MAX8997_MUICIRQ_VBVolt, "muic-VB_voltage" },
  87         { MAX8997_MUICIRQ_DBChg, "muic-DB_charger" },
  88         { MAX8997_MUICIRQ_DCDTmr, "muic-DCD_timer" },
  89         { MAX8997_MUICIRQ_ChgDetRun, "muic-CDR_status" },
  90         { MAX8997_MUICIRQ_ChgTyp, "muic-charger_type" },
  91         { MAX8997_MUICIRQ_OVP, "muic-over_voltage" },
  92 };
  93
  94 struct max8997_muic_info {
  95         struct device *dev;
  96         struct i2c_client *muic;
  97         struct max8997_muic_platform_data *muic_pdata;
  98
  99         int irq;
 100         struct work_struct irq_work;
 101
 102         enum max8997_muic_charger_type pre_charger_type;
 103         int pre_adc;
 104
 105         struct mutex mutex;
 106
 107         struct extcon_dev       *edev;
 108 };
 109
 110 const char *max8997_extcon_cable[] = {
 111         [0] = "USB",
 112         [1] = "USB-Host",
 113         [2] = "TA",
 114         [3] = "Fast-charger",
 115         [4] = "Slow-charger",
 116         [5] = "Charge-downstream",
 117         [6] = "MHL",
 118         [7] = "Dock-desk",
 119         [7] = "Dock-card",
 120         [8] = "JIG",
 121
 122         NULL,
 123 };
 124
 125 static int max8997_muic_handle_usb(struct max8997_muic_info *info,
 126                         enum max8997_muic_usb_type usb_type, bool attached)
 127 {
 128         int ret = 0;
 129
 130         if (usb_type == MAX8997_USB_HOST) {
 131                 /* switch to USB */
 132                 ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
 133                                 attached ? MAX8997_SW_USB : MAX8997_SW_OPEN,
 134                                 SW_MASK);
 135                 if (ret) {
 136                         dev_err(info->dev, "failed to update muic register\n");
 137                         goto out;
 138                 }
 139         }
 140
 141         switch (usb_type) {
 142         case MAX8997_USB_HOST:
 143                 extcon_set_cable_state(info->edev, "USB-Host", attached);
 144                 break;
 145         case MAX8997_USB_DEVICE:
 146                 extcon_set_cable_state(info->edev, "USB", attached);
 147                 break;
 148         default:
 149                 ret = -EINVAL;
 150                 break;
 151         }
 152
 153 out:
 154         return ret;
 155 }
 156
 157 static int max8997_muic_handle_dock(struct max8997_muic_info *info,
 158                         int adc, bool attached)
 159 {
 160         int ret = 0;
 161
 162         /* switch to AUDIO */
 163         ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
 164                                 attached ? MAX8997_SW_AUDIO : MAX8997_SW_OPEN,
 165                                 SW_MASK);
 166         if (ret) {
 167                 dev_err(info->dev, "failed to update muic register\n");
 168                 goto out;
 169         }
 170
 171         switch (adc) {
 172         case MAX8997_ADC_DESKDOCK:
 173                 extcon_set_cable_state(info->edev, "Dock-desk", attached);
 174                 break;
 175         case MAX8997_ADC_CARDOCK:
 176                 extcon_set_cable_state(info->edev, "Dock-card", attached);
 177                 break;
 178         default:
 179                 ret = -EINVAL;
 180                 break;
 181         }
 182 out:
 183         return ret;
 184 }
 185
 186 static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
 187                         bool attached)
 188 {
 189         int ret = 0;
 190
 191         /* switch to UART */
 192         ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
 193                                 attached ? MAX8997_SW_UART : MAX8997_SW_OPEN,
 194                                 SW_MASK);
 195         if (ret) {
 196                 dev_err(info->dev, "failed to update muic register\n");
 197                 goto out;
 198         }
 199
 200         extcon_set_cable_state(info->edev, "JIG", attached);
 201 out:
 202         return ret;
 203 }
 204
 205 static int max8997_muic_handle_adc_detach(struct max8997_muic_info *info)
 206 {
 207         int ret = 0;
 208
 209         switch (info->pre_adc) {
 210         case MAX8997_ADC_GROUND:
 211                 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, false);
 212                 break;
 213         case MAX8997_ADC_MHL:
 214                 extcon_set_cable_state(info->edev, "MHL", false);
 215                 break;
 216         case MAX8997_ADC_JIG_USB_1:
 217         case MAX8997_ADC_JIG_USB_2:
 218                 ret = max8997_muic_handle_usb(info, MAX8997_USB_DEVICE, false);
 219                 break;
 220         case MAX8997_ADC_DESKDOCK:
 221         case MAX8997_ADC_CARDOCK:
 222                 ret = max8997_muic_handle_dock(info, info->pre_adc, false);
 223                 break;
 224         case MAX8997_ADC_JIG_UART:
 225                 ret = max8997_muic_handle_jig_uart(info, false);
 226                 break;
 227         default:
 228                 break;
 229         }
 230
 231         return ret;
 232 }
 233
 234 static int max8997_muic_handle_adc(struct max8997_muic_info *info, int adc)
 235 {
 236         int ret = 0;
 237
 238         switch (adc) {
 239         case MAX8997_ADC_GROUND:
 240                 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, true);
 241                 break;
 242         case MAX8997_ADC_MHL:
 243                 extcon_set_cable_state(info->edev, "MHL", true);
 244                 break;
 245         case MAX8997_ADC_JIG_USB_1:
 246         case MAX8997_ADC_JIG_USB_2:
 247                 ret = max8997_muic_handle_usb(info, MAX8997_USB_DEVICE, true);
 248                 break;
 249         case MAX8997_ADC_DESKDOCK:
 250         case MAX8997_ADC_CARDOCK:
 251                 ret = max8997_muic_handle_dock(info, adc, true);
 252                 break;
 253         case MAX8997_ADC_JIG_UART:
 254                 ret = max8997_muic_handle_jig_uart(info, true);
 255                 break;
 256         case MAX8997_ADC_OPEN:
 257                 ret = max8997_muic_handle_adc_detach(info);
 258                 break;
 259         default:
 260                 ret = -EINVAL;
 261                 goto out;
 262         }
 263
 264         info->pre_adc = adc;
 265 out:
 266         return ret;
 267 }
 268
 269 static int max8997_muic_handle_charger_type_detach(
 270                                 struct max8997_muic_info *info)
 271 {
 272         int ret = 0;
 273
 274         switch (info->pre_charger_type) {
 275         case MAX8997_CHARGER_TYPE_USB:
 276                 extcon_set_cable_state(info->edev, "USB", false);
 277                 break;
 278         case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
 279                 extcon_set_cable_state(info->edev, "Charge-downstream", false);
 280                 break;
 281         case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
 282                 extcon_set_cable_state(info->edev, "TA", false);
 283                 break;
 284         case MAX8997_CHARGER_TYPE_500MA:
 285                 extcon_set_cable_state(info->edev, "Slow-charger", false);
 286                 break;
 287         case MAX8997_CHARGER_TYPE_1A:
 288                 extcon_set_cable_state(info->edev, "Fast-charger", false);
 289                 break;
 290         default:
 291                 ret = -EINVAL;
 292                 break;
 293         }
 294
 295         return ret;
 296 }
 297
 298 static int max8997_muic_handle_charger_type(struct max8997_muic_info *info,
 299                                 enum max8997_muic_charger_type charger_type)
 300 {
 301         u8 adc;
 302         int ret;
 303
 304         ret = max8997_read_reg(info->muic, MAX8997_MUIC_REG_STATUS1, &adc);
 305         if (ret) {
 306                 dev_err(info->dev, "failed to read muic register\n");
 307                 goto out;
 308         }
 309
 310         switch (charger_type) {
 311         case MAX8997_CHARGER_TYPE_NONE:
 312                 ret = max8997_muic_handle_charger_type_detach(info);
 313                 break;
 314         case MAX8997_CHARGER_TYPE_USB:
 315                 if ((adc & STATUS1_ADC_MASK) == MAX8997_ADC_OPEN) {
 316                         max8997_muic_handle_usb(info,
 317                                         MAX8997_USB_DEVICE, true);
 318                 }
 319                 break;
 320         case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
 321                 extcon_set_cable_state(info->edev, "Charge-downstream", true);
 322                 break;
 323         case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
 324                 extcon_set_cable_state(info->edev, "TA", true);
 325                 break;
 326         case MAX8997_CHARGER_TYPE_500MA:
 327                 extcon_set_cable_state(info->edev, "Slow-charger", true);
 328                 break;
 329         case MAX8997_CHARGER_TYPE_1A:
 330                 extcon_set_cable_state(info->edev, "Fast-charger", true);
 331                 break;
 332         default:
 333                 ret = -EINVAL;
 334                 goto out;
 335         }
 336
 337         info->pre_charger_type = charger_type;
 338 out:
 339         return ret;
 340 }
 341
 342 static void max8997_muic_irq_work(struct work_struct *work)
 343 {
 344         struct max8997_muic_info *info = container_of(work,
 345                         struct max8997_muic_info, irq_work);
 346         struct max8997_dev *max8997 = i2c_get_clientdata(info->muic);
 347         u8 status[2];
 348         u8 adc, chg_type;
 349
 350         int irq_type = info->irq - max8997->irq_base;
 351         int ret;
 352
 353         mutex_lock(&info->mutex);
 354
 355         ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
 356                                 2, status);
 357         if (ret) {
 358                 dev_err(info->dev, "failed to read muic register\n");
 359                 mutex_unlock(&info->mutex);
 360                 return;
 361         }
 362
 363         dev_dbg(info->dev, "%s: STATUS1:0x%x, 2:0x%x\n", __func__,
 364                         status[0], status[1]);
 365
 366         switch (irq_type) {
 367         case MAX8997_MUICIRQ_ADC:
 368                 adc = status[0] & STATUS1_ADC_MASK;
 369                 adc >>= STATUS1_ADC_SHIFT;
 370
 371                 max8997_muic_handle_adc(info, adc);
 372                 break;
 373         case MAX8997_MUICIRQ_ChgTyp:
 374                 chg_type = status[1] & STATUS2_CHGTYP_MASK;
 375                 chg_type >>= STATUS2_CHGTYP_SHIFT;
 376
 377                 max8997_muic_handle_charger_type(info, chg_type);
 378                 break;
 379         default:
 380                 dev_info(info->dev, "misc interrupt: irq %d occurred\n",
 381                                 irq_type);
 382                 break;
 383         }
 384
 385         mutex_unlock(&info->mutex);
 386
 387         return;
 388 }
 389
 390 static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
 391 {
 392         struct max8997_muic_info *info = data;
 393
 394         dev_dbg(info->dev, "irq:%d\n", irq);
 395         info->irq = irq;
 396
 397         schedule_work(&info->irq_work);
 398
 399         return IRQ_HANDLED;
 400 }
 401
 402 static void max8997_muic_detect_dev(struct max8997_muic_info *info)
 403 {
 404         int ret;
 405         u8 status[2], adc, chg_type;
 406
 407         ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
 408                                 2, status);
 409         if (ret) {
 410                 dev_err(info->dev, "failed to read muic register\n");
 411                 return;
 412         }
 413
 414         dev_info(info->dev, "STATUS1:0x%x, STATUS2:0x%x\n",
 415                         status[0], status[1]);
 416
 417         adc = status[0] & STATUS1_ADC_MASK;
 418         adc >>= STATUS1_ADC_SHIFT;
 419
 420         chg_type = status[1] & STATUS2_CHGTYP_MASK;
 421         chg_type >>= STATUS2_CHGTYP_SHIFT;
 422
 423         max8997_muic_handle_adc(info, adc);
 424         max8997_muic_handle_charger_type(info, chg_type);
 425 }
 426
 427 static int __devinit max8997_muic_probe(struct platform_device *pdev)
 428 {
 429         struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
 430         struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev);
 431         struct max8997_muic_info *info;
 432         int ret, i;
 433
 434         info = kzalloc(sizeof(struct max8997_muic_info), GFP_KERNEL);
 435         if (!info) {
 436                 dev_err(&pdev->dev, "failed to allocate memory\n");
 437                 ret = -ENOMEM;
 438                 goto err_kfree;
 439         }
 440
 441         info->dev = &pdev->dev;
 442         info->muic = max8997->muic;
 443
 444         platform_set_drvdata(pdev, info);
 445         mutex_init(&info->mutex);
 446
 447         INIT_WORK(&info->irq_work, max8997_muic_irq_work);
 448
 449         for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
 450                 struct max8997_muic_irq *muic_irq = &muic_irqs[i];
 451
 452                 ret = request_threaded_irq(pdata->irq_base + muic_irq->irq,
 453                                 NULL, max8997_muic_irq_handler,
 454                                 0, muic_irq->name,
 455                                 info);
 456                 if (ret) {
 457                         dev_err(&pdev->dev,
 458                                 "failed: irq request (IRQ: %d,"
 459                                 " error :%d)\n",
 460                                 muic_irq->irq, ret);
 461                         goto err_irq;
 462                 }
 463         }
 464
 465         /* External connector */
 466         info->edev = kzalloc(sizeof(struct extcon_dev), GFP_KERNEL);
 467         if (!info->edev) {
 468                 dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
 469                 ret = -ENOMEM;
 470                 goto err_irq;
 471         }
 472         info->edev->name = DEV_NAME;
 473         info->edev->supported_cable = max8997_extcon_cable;
 474         ret = extcon_dev_register(info->edev, NULL);
 475         if (ret) {
 476                 dev_err(&pdev->dev, "failed to register extcon device\n");
 477                 goto err_extcon;
 478         }
 479
 480         /* Initialize registers according to platform data */
 481         if (pdata->muic_pdata) {
 482                 struct max8997_muic_platform_data *mdata = info->muic_pdata;
 483
 484                 for (i = 0; i < mdata->num_init_data; i++) {
 485                         max8997_write_reg(info->muic, mdata->init_data[i].addr,
 486                                         mdata->init_data[i].data);
 487                 }
 488         }
 489
 490         /* Initial device detection */
 491         max8997_muic_detect_dev(info);
 492
 493         return ret;
 494
 495 err_extcon:
 496         kfree(info->edev);
 497 err_irq:
 498         while (--i >= 0)
 499                 free_irq(pdata->irq_base + muic_irqs[i].irq, info);
 500         kfree(info);
 501 err_kfree:
 502         return ret;
 503 }
 504
 505 static int __devexit max8997_muic_remove(struct platform_device *pdev)
 506 {
 507         struct max8997_muic_info *info = platform_get_drvdata(pdev);
 508         struct max8997_dev *max8997 = i2c_get_clientdata(info->muic);
 509         int i;
 510
 511         for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
 512                 free_irq(max8997->irq_base + muic_irqs[i].irq, info);
 513         cancel_work_sync(&info->irq_work);
 514
 515         extcon_dev_unregister(info->edev);
 516
 517         kfree(info);
 518
 519         return 0;
 520 }
 521
 522 static struct platform_driver max8997_muic_driver = {
 523         .driver         = {
 524                 .name   = DEV_NAME,
 525                 .owner  = THIS_MODULE,
 526         },
 527         .probe          = max8997_muic_probe,
 528         .remove         = __devexit_p(max8997_muic_remove),
 529 };
 530
 531 module_platform_driver(max8997_muic_driver);
 532
 533 MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver");
 534 MODULE_AUTHOR("Donggeun Kim <[email protected]>");
 535 MODULE_LICENSE("GPL");