drivers/mfd/da903x.c

   1 /*
   2  * Base driver for Dialog Semiconductor DA9030/DA9034
   3  *
   4  * Copyright (C) 2008 Compulab, Ltd.
   5  *      Mike Rapoport <mike@compulab.co.il>
   6  *
   7  * Copyright (C) 2006-2008 Marvell International Ltd.
   8  *      Eric Miao <eric.miao@marvell.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/i2c.h>
  20 #include <linux/mfd/da903x.h>
  21
  22 #define DA9030_CHIP_ID          0x00
  23 #define DA9030_EVENT_A          0x01
  24 #define DA9030_EVENT_B          0x02
  25 #define DA9030_EVENT_C          0x03
  26 #define DA9030_STATUS           0x04
  27 #define DA9030_IRQ_MASK_A       0x05
  28 #define DA9030_IRQ_MASK_B       0x06
  29 #define DA9030_IRQ_MASK_C       0x07
  30 #define DA9030_SYS_CTRL_A       0x08
  31 #define DA9030_SYS_CTRL_B       0x09
  32 #define DA9030_FAULT_LOG        0x0a
  33
  34 #define DA9034_CHIP_ID          0x00
  35 #define DA9034_EVENT_A          0x01
  36 #define DA9034_EVENT_B          0x02
  37 #define DA9034_EVENT_C          0x03
  38 #define DA9034_EVENT_D          0x04
  39 #define DA9034_STATUS_A         0x05
  40 #define DA9034_STATUS_B         0x06
  41 #define DA9034_IRQ_MASK_A       0x07
  42 #define DA9034_IRQ_MASK_B       0x08
  43 #define DA9034_IRQ_MASK_C       0x09
  44 #define DA9034_IRQ_MASK_D       0x0a
  45 #define DA9034_SYS_CTRL_A       0x0b
  46 #define DA9034_SYS_CTRL_B       0x0c
  47 #define DA9034_FAULT_LOG        0x0d
  48
  49 struct da903x_chip;
  50
  51 struct da903x_chip_ops {
  52         int     (*init_chip)(struct da903x_chip *);
  53         int     (*unmask_events)(struct da903x_chip *, unsigned int events);
  54         int     (*mask_events)(struct da903x_chip *, unsigned int events);
  55         int     (*read_events)(struct da903x_chip *, unsigned int *events);
  56         int     (*read_status)(struct da903x_chip *, unsigned int *status);
  57 };
  58
  59 struct da903x_chip {
  60         struct i2c_client       *client;
  61         struct device           *dev;
  62         struct da903x_chip_ops  *ops;
  63
  64         int                     type;
  65         uint32_t                events_mask;
  66
  67         struct mutex            lock;
  68         struct work_struct      irq_work;
  69
  70         struct blocking_notifier_head notifier_list;
  71 };
  72
  73 static inline int __da903x_read(struct i2c_client *client,
  74                                 int reg, uint8_t *val)
  75 {
  76         int ret;
  77
  78         ret = i2c_smbus_read_byte_data(client, reg);
  79         if (ret < 0) {
  80                 dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
  81                 return ret;
  82         }
  83
  84         *val = (uint8_t)ret;
  85         return 0;
  86 }
  87
  88 static inline int __da903x_reads(struct i2c_client *client, int reg,
  89                                  int len, uint8_t *val)
  90 {
  91         int ret;
  92
  93         ret = i2c_smbus_read_i2c_block_data(client, reg, len, val);
  94         if (ret < 0) {
  95                 dev_err(&client->dev, "failed reading from 0x%02x\n", reg);
  96                 return ret;
  97         }
  98         return 0;
  99 }
 100
 101 static inline int __da903x_write(struct i2c_client *client,
 102                                  int reg, uint8_t val)
 103 {
 104         int ret;
 105
 106         ret = i2c_smbus_write_byte_data(client, reg, val);
 107         if (ret < 0) {
 108                 dev_err(&client->dev, "failed writing 0x%02x to 0x%02x\n",
 109                                 val, reg);
 110                 return ret;
 111         }
 112         return 0;
 113 }
 114
 115 static inline int __da903x_writes(struct i2c_client *client, int reg,
 116                                   int len, uint8_t *val)
 117 {
 118         int ret;
 119
 120         ret = i2c_smbus_write_i2c_block_data(client, reg, len, val);
 121         if (ret < 0) {
 122                 dev_err(&client->dev, "failed writings to 0x%02x\n", reg);
 123                 return ret;
 124         }
 125         return 0;
 126 }
 127
 128 int da903x_register_notifier(struct device *dev, struct notifier_block *nb,
 129                                 unsigned int events)
 130 {
 131         struct da903x_chip *chip = dev_get_drvdata(dev);
 132
 133         chip->ops->unmask_events(chip, events);
 134         return blocking_notifier_chain_register(&chip->notifier_list, nb);
 135 }
 136 EXPORT_SYMBOL_GPL(da903x_register_notifier);
 137
 138 int da903x_unregister_notifier(struct device *dev, struct notifier_block *nb,
 139                                 unsigned int events)
 140 {
 141         struct da903x_chip *chip = dev_get_drvdata(dev);
 142
 143         chip->ops->mask_events(chip, events);
 144         return blocking_notifier_chain_unregister(&chip->notifier_list, nb);
 145 }
 146 EXPORT_SYMBOL_GPL(da903x_unregister_notifier);
 147
 148 int da903x_write(struct device *dev, int reg, uint8_t val)
 149 {
 150         return __da903x_write(to_i2c_client(dev), reg, val);
 151 }
 152 EXPORT_SYMBOL_GPL(da903x_write);
 153
 154 int da903x_writes(struct device *dev, int reg, int len, uint8_t *val)
 155 {
 156         return __da903x_writes(to_i2c_client(dev), reg, len, val);
 157 }
 158 EXPORT_SYMBOL_GPL(da903x_writes);
 159
 160 int da903x_read(struct device *dev, int reg, uint8_t *val)
 161 {
 162         return __da903x_read(to_i2c_client(dev), reg, val);
 163 }
 164 EXPORT_SYMBOL_GPL(da903x_read);
 165
 166 int da903x_reads(struct device *dev, int reg, int len, uint8_t *val)
 167 {
 168         return __da903x_reads(to_i2c_client(dev), reg, len, val);
 169 }
 170 EXPORT_SYMBOL_GPL(da903x_reads);
 171
 172 int da903x_set_bits(struct device *dev, int reg, uint8_t bit_mask)
 173 {
 174         struct da903x_chip *chip = dev_get_drvdata(dev);
 175         uint8_t reg_val;
 176         int ret = 0;
 177
 178         mutex_lock(&chip->lock);
 179
 180         ret = __da903x_read(chip->client, reg, &reg_val);
 181         if (ret)
 182                 goto out;
 183
 184         if ((reg_val & bit_mask) == 0) {
 185                 reg_val |= bit_mask;
 186                 ret = __da903x_write(chip->client, reg, reg_val);
 187         }
 188 out:
 189         mutex_unlock(&chip->lock);
 190         return ret;
 191 }
 192 EXPORT_SYMBOL_GPL(da903x_set_bits);
 193
 194 int da903x_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
 195 {
 196         struct da903x_chip *chip = dev_get_drvdata(dev);
 197         uint8_t reg_val;
 198         int ret = 0;
 199
 200         mutex_lock(&chip->lock);
 201
 202         ret = __da903x_read(chip->client, reg, &reg_val);
 203         if (ret)
 204                 goto out;
 205
 206         if (reg_val & bit_mask) {
 207                 reg_val &= ~bit_mask;
 208                 ret = __da903x_write(chip->client, reg, reg_val);
 209         }
 210 out:
 211         mutex_unlock(&chip->lock);
 212         return ret;
 213 }
 214 EXPORT_SYMBOL_GPL(da903x_clr_bits);
 215
 216 int da903x_update(struct device *dev, int reg, uint8_t val, uint8_t mask)
 217 {
 218         struct da903x_chip *chip = dev_get_drvdata(dev);
 219         uint8_t reg_val;
 220         int ret = 0;
 221
 222         mutex_lock(&chip->lock);
 223
 224         ret = __da903x_read(chip->client, reg, &reg_val);
 225         if (ret)
 226                 goto out;
 227
 228         if ((reg_val & mask) != val) {
 229                 reg_val = (reg_val & ~mask) | val;
 230                 ret = __da903x_write(chip->client, reg, reg_val);
 231         }
 232 out:
 233         mutex_unlock(&chip->lock);
 234         return ret;
 235 }
 236 EXPORT_SYMBOL_GPL(da903x_update);
 237
 238 int da903x_query_status(struct device *dev, unsigned int sbits)
 239 {
 240         struct da903x_chip *chip = dev_get_drvdata(dev);
 241         unsigned int status = 0;
 242
 243         chip->ops->read_status(chip, &status);
 244         return ((status & sbits) == sbits);
 245 }
 246 EXPORT_SYMBOL(da903x_query_status);
 247
 248 static int __devinit da9030_init_chip(struct da903x_chip *chip)
 249 {
 250         uint8_t chip_id;
 251         int err;
 252
 253         err = __da903x_read(chip->client, DA9030_CHIP_ID, &chip_id);
 254         if (err)
 255                 return err;
 256
 257         err = __da903x_write(chip->client, DA9030_SYS_CTRL_A, 0xE8);
 258         if (err)
 259                 return err;
 260
 261         dev_info(chip->dev, "DA9030 (CHIP ID: 0x%02x) detected\n", chip_id);
 262         return 0;
 263 }
 264
 265 static int da9030_unmask_events(struct da903x_chip *chip, unsigned int events)
 266 {
 267         uint8_t v[3];
 268
 269         chip->events_mask &= ~events;
 270
 271         v[0] = (chip->events_mask & 0xff);
 272         v[1] = (chip->events_mask >> 8) & 0xff;
 273         v[2] = (chip->events_mask >> 16) & 0xff;
 274
 275         return __da903x_writes(chip->client, DA9030_IRQ_MASK_A, 3, v);
 276 }
 277
 278 static int da9030_mask_events(struct da903x_chip *chip, unsigned int events)
 279 {
 280         uint8_t v[3];
 281
 282         chip->events_mask |= events;
 283
 284         v[0] = (chip->events_mask & 0xff);
 285         v[1] = (chip->events_mask >> 8) & 0xff;
 286         v[2] = (chip->events_mask >> 16) & 0xff;
 287
 288         return __da903x_writes(chip->client, DA9030_IRQ_MASK_A, 3, v);
 289 }
 290
 291 static int da9030_read_events(struct da903x_chip *chip, unsigned int *events)
 292 {
 293         uint8_t v[3] = {0, 0, 0};
 294         int ret;
 295
 296         ret = __da903x_reads(chip->client, DA9030_EVENT_A, 3, v);
 297         if (ret < 0)
 298                 return ret;
 299
 300         *events = (v[2] << 16) | (v[1] << 8) | v[0];
 301         return 0;
 302 }
 303
 304 static int da9030_read_status(struct da903x_chip *chip, unsigned int *status)
 305 {
 306         return __da903x_read(chip->client, DA9030_STATUS, (uint8_t *)status);
 307 }
 308
 309 static int da9034_init_chip(struct da903x_chip *chip)
 310 {
 311         uint8_t chip_id;
 312         int err;
 313
 314         err = __da903x_read(chip->client, DA9034_CHIP_ID, &chip_id);
 315         if (err)
 316                 return err;
 317
 318         err = __da903x_write(chip->client, DA9034_SYS_CTRL_A, 0xE8);
 319         if (err)
 320                 return err;
 321
 322         /* avoid SRAM power off during sleep*/
 323         __da903x_write(chip->client, 0x10, 0x07);
 324         __da903x_write(chip->client, 0x11, 0xff);
 325         __da903x_write(chip->client, 0x12, 0xff);
 326
 327         /* Enable the ONKEY power down functionality */
 328         __da903x_write(chip->client, DA9034_SYS_CTRL_B, 0x20);
 329         __da903x_write(chip->client, DA9034_SYS_CTRL_A, 0x60);
 330
 331         /* workaround to make LEDs work */
 332         __da903x_write(chip->client, 0x90, 0x01);
 333         __da903x_write(chip->client, 0xB0, 0x08);
 334
 335         /* make ADTV1 and SDTV1 effective */
 336         __da903x_write(chip->client, 0x20, 0x00);
 337
 338         dev_info(chip->dev, "DA9034 (CHIP ID: 0x%02x) detected\n", chip_id);
 339         return 0;
 340 }
 341
 342 static int da9034_unmask_events(struct da903x_chip *chip, unsigned int events)
 343 {
 344         uint8_t v[4];
 345
 346         chip->events_mask &= ~events;
 347
 348         v[0] = (chip->events_mask & 0xff);
 349         v[1] = (chip->events_mask >> 8) & 0xff;
 350         v[2] = (chip->events_mask >> 16) & 0xff;
 351         v[3] = (chip->events_mask >> 24) & 0xff;
 352
 353         return __da903x_writes(chip->client, DA9034_IRQ_MASK_A, 4, v);
 354 }
 355
 356 static int da9034_mask_events(struct da903x_chip *chip, unsigned int events)
 357 {
 358         uint8_t v[4];
 359
 360         chip->events_mask |= events;
 361
 362         v[0] = (chip->events_mask & 0xff);
 363         v[1] = (chip->events_mask >> 8) & 0xff;
 364         v[2] = (chip->events_mask >> 16) & 0xff;
 365         v[3] = (chip->events_mask >> 24) & 0xff;
 366
 367         return __da903x_writes(chip->client, DA9034_IRQ_MASK_A, 4, v);
 368 }
 369
 370 static int da9034_read_events(struct da903x_chip *chip, unsigned int *events)
 371 {
 372         uint8_t v[4] = {0, 0, 0, 0};
 373         int ret;
 374
 375         ret = __da903x_reads(chip->client, DA9034_EVENT_A, 4, v);
 376         if (ret < 0)
 377                 return ret;
 378
 379         *events = (v[3] << 24) | (v[2] << 16) | (v[1] << 8) | v[0];
 380         return 0;
 381 }
 382
 383 static int da9034_read_status(struct da903x_chip *chip, unsigned int *status)
 384 {
 385         uint8_t v[2] = {0, 0};
 386         int ret = 0;
 387
 388         ret = __da903x_reads(chip->client, DA9034_STATUS_A, 2, v);
 389         if (ret)
 390                 return ret;
 391
 392         *status = (v[1] << 8) | v[0];
 393         return 0;
 394 }
 395
 396 static void da903x_irq_work(struct work_struct *work)
 397 {
 398         struct da903x_chip *chip =
 399                 container_of(work, struct da903x_chip, irq_work);
 400         unsigned int events = 0;
 401
 402         while (1) {
 403                 if (chip->ops->read_events(chip, &events))
 404                         break;
 405
 406                 events &= ~chip->events_mask;
 407                 if (events == 0)
 408                         break;
 409
 410                 blocking_notifier_call_chain(
 411                                 &chip->notifier_list, events, NULL);
 412         }
 413         enable_irq(chip->client->irq);
 414 }
 415
 416 static irqreturn_t da903x_irq_handler(int irq, void *data)
 417 {
 418         struct da903x_chip *chip = data;
 419
 420         disable_irq_nosync(irq);
 421         (void)schedule_work(&chip->irq_work);
 422
 423         return IRQ_HANDLED;
 424 }
 425
 426 static struct da903x_chip_ops da903x_ops[] = {
 427         [0] = {
 428                 .init_chip      = da9030_init_chip,
 429                 .unmask_events  = da9030_unmask_events,
 430                 .mask_events    = da9030_mask_events,
 431                 .read_events    = da9030_read_events,
 432                 .read_status    = da9030_read_status,
 433         },
 434         [1] = {
 435                 .init_chip      = da9034_init_chip,
 436                 .unmask_events  = da9034_unmask_events,
 437                 .mask_events    = da9034_mask_events,
 438                 .read_events    = da9034_read_events,
 439                 .read_status    = da9034_read_status,
 440         }
 441 };
 442
 443 static const struct i2c_device_id da903x_id_table[] = {
 444         { "da9030", 0 },
 445         { "da9034", 1 },
 446         { },
 447 };
 448 MODULE_DEVICE_TABLE(i2c, da903x_id_table);
 449
 450 static int __remove_subdev(struct device *dev, void *unused)
 451 {
 452         platform_device_unregister(to_platform_device(dev));
 453         return 0;
 454 }
 455
 456 static int da903x_remove_subdevs(struct da903x_chip *chip)
 457 {
 458         return device_for_each_child(chip->dev, NULL, __remove_subdev);
 459 }
 460
 461 static int __devinit da903x_add_subdevs(struct da903x_chip *chip,
 462                                         struct da903x_platform_data *pdata)
 463 {
 464         struct da903x_subdev_info *subdev;
 465         struct platform_device *pdev;
 466         int i, ret = 0;
 467
 468         for (i = 0; i < pdata->num_subdevs; i++) {
 469                 subdev = &pdata->subdevs[i];
 470
 471                 pdev = platform_device_alloc(subdev->name, subdev->id);
 472
 473                 pdev->dev.parent = chip->dev;
 474                 pdev->dev.platform_data = subdev->platform_data;
 475
 476                 ret = platform_device_add(pdev);
 477                 if (ret)
 478                         goto failed;
 479         }
 480         return 0;
 481
 482 failed:
 483         da903x_remove_subdevs(chip);
 484         return ret;
 485 }
 486
 487 static int __devinit da903x_probe(struct i2c_client *client,
 488                                   const struct i2c_device_id *id)
 489 {
 490         struct da903x_platform_data *pdata = client->dev.platform_data;
 491         struct da903x_chip *chip;
 492         unsigned int tmp;
 493         int ret;
 494
 495         chip = kzalloc(sizeof(struct da903x_chip), GFP_KERNEL);
 496         if (chip == NULL)
 497                 return -ENOMEM;
 498
 499         chip->client = client;
 500         chip->dev = &client->dev;
 501         chip->ops = &da903x_ops[id->driver_data];
 502
 503         mutex_init(&chip->lock);
 504         INIT_WORK(&chip->irq_work, da903x_irq_work);
 505         BLOCKING_INIT_NOTIFIER_HEAD(&chip->notifier_list);
 506
 507         i2c_set_clientdata(client, chip);
 508
 509         ret = chip->ops->init_chip(chip);
 510         if (ret)
 511                 goto out_free_chip;
 512
 513         /* mask and clear all IRQs */
 514         chip->events_mask = 0xffffffff;
 515         chip->ops->mask_events(chip, chip->events_mask);
 516         chip->ops->read_events(chip, &tmp);
 517
 518         ret = request_irq(client->irq, da903x_irq_handler,
 519                         IRQF_DISABLED | IRQF_TRIGGER_FALLING,
 520                         "da903x", chip);
 521         if (ret) {
 522                 dev_err(&client->dev, "failed to request irq %d\n",
 523                                 client->irq);
 524                 goto out_free_chip;
 525         }
 526
 527         ret = da903x_add_subdevs(chip, pdata);
 528         if (ret)
 529                 goto out_free_irq;
 530
 531         return 0;
 532
 533 out_free_irq:
 534         free_irq(client->irq, chip);
 535 out_free_chip:
 536         i2c_set_clientdata(client, NULL);
 537         kfree(chip);
 538         return ret;
 539 }
 540
 541 static int __devexit da903x_remove(struct i2c_client *client)
 542 {
 543         struct da903x_chip *chip = i2c_get_clientdata(client);
 544
 545         da903x_remove_subdevs(chip);
 546         kfree(chip);
 547         return 0;
 548 }
 549
 550 static struct i2c_driver da903x_driver = {
 551         .driver = {
 552                 .name   = "da903x",
 553                 .owner  = THIS_MODULE,
 554         },
 555         .probe          = da903x_probe,
 556         .remove         = __devexit_p(da903x_remove),
 557         .id_table       = da903x_id_table,
 558 };
 559
 560 static int __init da903x_init(void)
 561 {
 562         return i2c_add_driver(&da903x_driver);
 563 }
 564 subsys_initcall(da903x_init);
 565
 566 static void __exit da903x_exit(void)
 567 {
 568         i2c_del_driver(&da903x_driver);
 569 }
 570 module_exit(da903x_exit);
 571
 572 MODULE_DESCRIPTION("PMIC Driver for Dialog Semiconductor DA9034");
 573 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>"
 574               "Mike Rapoport <mike@compulab.co.il>");
 575 MODULE_LICENSE("GPL");