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 #include <linux/slab.h>
  22
  23 #define DA9030_CHIP_ID          0x00
  24 #define DA9030_EVENT_A          0x01
  25 #define DA9030_EVENT_B          0x02
  26 #define DA9030_EVENT_C          0x03
  27 #define DA9030_STATUS           0x04
  28 #define DA9030_IRQ_MASK_A       0x05
  29 #define DA9030_IRQ_MASK_B       0x06
  30 #define DA9030_IRQ_MASK_C       0x07
  31 #define DA9030_SYS_CTRL_A       0x08
  32 #define DA9030_SYS_CTRL_B       0x09
  33 #define DA9030_FAULT_LOG        0x0a
  34
  35 #define DA9034_CHIP_ID          0x00
  36 #define DA9034_EVENT_A          0x01
  37 #define DA9034_EVENT_B          0x02
  38 #define DA9034_EVENT_C          0x03
  39 #define DA9034_EVENT_D          0x04
  40 #define DA9034_STATUS_A         0x05
  41 #define DA9034_STATUS_B         0x06
  42 #define DA9034_IRQ_MASK_A       0x07
  43 #define DA9034_IRQ_MASK_B       0x08
  44 #define DA9034_IRQ_MASK_C       0x09
  45 #define DA9034_IRQ_MASK_D       0x0a
  46 #define DA9034_SYS_CTRL_A       0x0b
  47 #define DA9034_SYS_CTRL_B       0x0c
  48 #define DA9034_FAULT_LOG        0x0d
  49
  50 struct da903x_chip;
  51
  52 struct da903x_chip_ops {
  53         int     (*init_chip)(struct da903x_chip *);
  54         int     (*unmask_events)(struct da903x_chip *, unsigned int events);
  55         int     (*mask_events)(struct da903x_chip *, unsigned int events);
  56         int     (*read_events)(struct da903x_chip *, unsigned int *events);
  57         int     (*read_status)(struct da903x_chip *, unsigned int *status);
  58 };
  59
  60 struct da903x_chip {
  61         struct i2c_client       *client;
  62         struct device           *dev;
  63         const struct da903x_chip_ops *ops;
  64
  65         int                     type;
  66         uint32_t                events_mask;
  67
  68         struct mutex            lock;
  69         struct work_struct      irq_work;
  70
  71         struct blocking_notifier_head notifier_list;
  72 };
  73
  74 static inline int __da903x_read(struct i2c_client *client,
  75                                 int reg, uint8_t *val)
  76 {
  77         int ret;
  78
  79         ret = i2c_smbus_read_byte_data(client, reg);
  80         if (ret < 0) {
  81                 dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
  82                 return ret;
  83         }
  84
  85         *val = (uint8_t)ret;
  86         return 0;
  87 }
  88
  89 static inline int __da903x_reads(struct i2c_client *client, int reg,
  90                                  int len, uint8_t *val)
  91 {
  92         int ret;
  93
  94         ret = i2c_smbus_read_i2c_block_data(client, reg, len, val);
  95         if (ret < 0) {
  96                 dev_err(&client->dev, "failed reading from 0x%02x\n", reg);
  97                 return ret;
  98         }
  99         return 0;
 100 }
 101
 102 static inline int __da903x_write(struct i2c_client *client,
 103                                  int reg, uint8_t val)
 104 {
 105         int ret;
 106
 107         ret = i2c_smbus_write_byte_data(client, reg, val);
 108         if (ret < 0) {
 109                 dev_err(&client->dev, "failed writing 0x%02x to 0x%02x\n",
 110                                 val, reg);
 111                 return ret;
 112         }
 113         return 0;
 114 }
 115
 116 static inline int __da903x_writes(struct i2c_client *client, int reg,
 117                                   int len, uint8_t *val)
 118 {
 119         int ret;
 120
 121         ret = i2c_smbus_write_i2c_block_data(client, reg, len, val);
 122         if (ret < 0) {
 123                 dev_err(&client->dev, "failed writings to 0x%02x\n", reg);
 124                 return ret;
 125         }
 126         return 0;
 127 }
 128
 129 int da903x_register_notifier(struct device *dev, struct notifier_block *nb,
 130                                 unsigned int events)
 131 {
 132         struct da903x_chip *chip = dev_get_drvdata(dev);
 133
 134         chip->ops->unmask_events(chip, events);
 135         return blocking_notifier_chain_register(&chip->notifier_list, nb);
 136 }
 137 EXPORT_SYMBOL_GPL(da903x_register_notifier);
 138
 139 int da903x_unregister_notifier(struct device *dev, struct notifier_block *nb,
 140                                 unsigned int events)
 141 {
 142         struct da903x_chip *chip = dev_get_drvdata(dev);
 143
 144         chip->ops->mask_events(chip, events);
 145         return blocking_notifier_chain_unregister(&chip->notifier_list, nb);
 146 }
 147 EXPORT_SYMBOL_GPL(da903x_unregister_notifier);
 148
 149 int da903x_write(struct device *dev, int reg, uint8_t val)
 150 {
 151         return __da903x_write(to_i2c_client(dev), reg, val);
 152 }
 153 EXPORT_SYMBOL_GPL(da903x_write);
 154
 155 int da903x_writes(struct device *dev, int reg, int len, uint8_t *val)
 156 {
 157         return __da903x_writes(to_i2c_client(dev), reg, len, val);
 158 }
 159 EXPORT_SYMBOL_GPL(da903x_writes);
 160
 161 int da903x_read(struct device *dev, int reg, uint8_t *val)
 162 {
 163         return __da903x_read(to_i2c_client(dev), reg, val);
 164 }
 165 EXPORT_SYMBOL_GPL(da903x_read);
 166
 167 int da903x_reads(struct device *dev, int reg, int len, uint8_t *val)
 168 {
 169         return __da903x_reads(to_i2c_client(dev), reg, len, val);
 170 }
 171 EXPORT_SYMBOL_GPL(da903x_reads);
 172
 173 int da903x_set_bits(struct device *dev, int reg, uint8_t bit_mask)
 174 {
 175         struct da903x_chip *chip = dev_get_drvdata(dev);
 176         uint8_t reg_val;
 177         int ret = 0;
 178
 179         mutex_lock(&chip->lock);
 180
 181         ret = __da903x_read(chip->client, reg, &reg_val);
 182         if (ret)
 183                 goto out;
 184
 185         if ((reg_val & bit_mask) != bit_mask) {
 186                 reg_val |= bit_mask;
 187                 ret = __da903x_write(chip->client, reg, reg_val);
 188         }
 189 out:
 190         mutex_unlock(&chip->lock);
 191         return ret;
 192 }
 193 EXPORT_SYMBOL_GPL(da903x_set_bits);
 194
 195 int da903x_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
 196 {
 197         struct da903x_chip *chip = dev_get_drvdata(dev);
 198         uint8_t reg_val;
 199         int ret = 0;
 200
 201         mutex_lock(&chip->lock);
 202
 203         ret = __da903x_read(chip->client, reg, &reg_val);
 204         if (ret)
 205                 goto out;
 206
 207         if (reg_val & bit_mask) {
 208                 reg_val &= ~bit_mask;
 209                 ret = __da903x_write(chip->client, reg, reg_val);
 210         }
 211 out:
 212         mutex_unlock(&chip->lock);
 213         return ret;
 214 }
 215 EXPORT_SYMBOL_GPL(da903x_clr_bits);
 216
 217 int da903x_update(struct device *dev, int reg, uint8_t val, uint8_t mask)
 218 {
 219         struct da903x_chip *chip = dev_get_drvdata(dev);
 220         uint8_t reg_val;
 221         int ret = 0;
 222
 223         mutex_lock(&chip->lock);
 224
 225         ret = __da903x_read(chip->client, reg, &reg_val);
 226         if (ret)
 227                 goto out;
 228
 229         if ((reg_val & mask) != val) {
 230                 reg_val = (reg_val & ~mask) | val;
 231                 ret = __da903x_write(chip->client, reg, reg_val);
 232         }
 233 out:
 234         mutex_unlock(&chip->lock);
 235         return ret;
 236 }
 237 EXPORT_SYMBOL_GPL(da903x_update);
 238
 239 int da903x_query_status(struct device *dev, unsigned int sbits)
 240 {
 241         struct da903x_chip *chip = dev_get_drvdata(dev);
 242         unsigned int status = 0;
 243
 244         chip->ops->read_status(chip, &status);
 245         return ((status & sbits) == sbits);
 246 }
 247 EXPORT_SYMBOL(da903x_query_status);
 248
 249 static int da9030_init_chip(struct da903x_chip *chip)
 250 {
 251         uint8_t chip_id;
 252         int err;
 253
 254         err = __da903x_read(chip->client, DA9030_CHIP_ID, &chip_id);
 255         if (err)
 256                 return err;
 257
 258         err = __da903x_write(chip->client, DA9030_SYS_CTRL_A, 0xE8);
 259         if (err)
 260                 return err;
 261
 262         dev_info(chip->dev, "DA9030 (CHIP ID: 0x%02x) detected\n", chip_id);
 263         return 0;
 264 }
 265
 266 static int da9030_unmask_events(struct da903x_chip *chip, unsigned int events)
 267 {
 268         uint8_t v[3];
 269
 270         chip->events_mask &= ~events;
 271
 272         v[0] = (chip->events_mask & 0xff);
 273         v[1] = (chip->events_mask >> 8) & 0xff;
 274         v[2] = (chip->events_mask >> 16) & 0xff;
 275
 276         return __da903x_writes(chip->client, DA9030_IRQ_MASK_A, 3, v);
 277 }
 278
 279 static int da9030_mask_events(struct da903x_chip *chip, unsigned int events)
 280 {
 281         uint8_t v[3];
 282
 283         chip->events_mask |= events;
 284
 285         v[0] = (chip->events_mask & 0xff);
 286         v[1] = (chip->events_mask >> 8) & 0xff;
 287         v[2] = (chip->events_mask >> 16) & 0xff;
 288
 289         return __da903x_writes(chip->client, DA9030_IRQ_MASK_A, 3, v);
 290 }
 291
 292 static int da9030_read_events(struct da903x_chip *chip, unsigned int *events)
 293 {
 294         uint8_t v[3] = {0, 0, 0};
 295         int ret;
 296
 297         ret = __da903x_reads(chip->client, DA9030_EVENT_A, 3, v);
 298         if (ret < 0)
 299                 return ret;
 300
 301         *events = (v[2] << 16) | (v[1] << 8) | v[0];
 302         return 0;
 303 }
 304
 305 static int da9030_read_status(struct da903x_chip *chip, unsigned int *status)
 306 {
 307         return __da903x_read(chip->client, DA9030_STATUS, (uint8_t *)status);
 308 }
 309
 310 static int da9034_init_chip(struct da903x_chip *chip)
 311 {
 312         uint8_t chip_id;
 313         int err;
 314
 315         err = __da903x_read(chip->client, DA9034_CHIP_ID, &chip_id);
 316         if (err)
 317                 return err;
 318
 319         err = __da903x_write(chip->client, DA9034_SYS_CTRL_A, 0xE8);
 320         if (err)
 321                 return err;
 322
 323         /* avoid SRAM power off during sleep*/
 324         __da903x_write(chip->client, 0x10, 0x07);
 325         __da903x_write(chip->client, 0x11, 0xff);
 326         __da903x_write(chip->client, 0x12, 0xff);
 327
 328         /* Enable the ONKEY power down functionality */
 329         __da903x_write(chip->client, DA9034_SYS_CTRL_B, 0x20);
 330         __da903x_write(chip->client, DA9034_SYS_CTRL_A, 0x60);
 331
 332         /* workaround to make LEDs work */
 333         __da903x_write(chip->client, 0x90, 0x01);
 334         __da903x_write(chip->client, 0xB0, 0x08);
 335
 336         /* make ADTV1 and SDTV1 effective */
 337         __da903x_write(chip->client, 0x20, 0x00);
 338
 339         dev_info(chip->dev, "DA9034 (CHIP ID: 0x%02x) detected\n", chip_id);
 340         return 0;
 341 }
 342
 343 static int da9034_unmask_events(struct da903x_chip *chip, unsigned int events)
 344 {
 345         uint8_t v[4];
 346
 347         chip->events_mask &= ~events;
 348
 349         v[0] = (chip->events_mask & 0xff);
 350         v[1] = (chip->events_mask >> 8) & 0xff;
 351         v[2] = (chip->events_mask >> 16) & 0xff;
 352         v[3] = (chip->events_mask >> 24) & 0xff;
 353
 354         return __da903x_writes(chip->client, DA9034_IRQ_MASK_A, 4, v);
 355 }
 356
 357 static int da9034_mask_events(struct da903x_chip *chip, unsigned int events)
 358 {
 359         uint8_t v[4];
 360
 361         chip->events_mask |= events;
 362
 363         v[0] = (chip->events_mask & 0xff);
 364         v[1] = (chip->events_mask >> 8) & 0xff;
 365         v[2] = (chip->events_mask >> 16) & 0xff;
 366         v[3] = (chip->events_mask >> 24) & 0xff;
 367
 368         return __da903x_writes(chip->client, DA9034_IRQ_MASK_A, 4, v);
 369 }
 370
 371 static int da9034_read_events(struct da903x_chip *chip, unsigned int *events)
 372 {
 373         uint8_t v[4] = {0, 0, 0, 0};
 374         int ret;
 375
 376         ret = __da903x_reads(chip->client, DA9034_EVENT_A, 4, v);
 377         if (ret < 0)
 378                 return ret;
 379
 380         *events = (v[3] << 24) | (v[2] << 16) | (v[1] << 8) | v[0];
 381         return 0;
 382 }
 383
 384 static int da9034_read_status(struct da903x_chip *chip, unsigned int *status)
 385 {
 386         uint8_t v[2] = {0, 0};
 387         int ret = 0;
 388
 389         ret = __da903x_reads(chip->client, DA9034_STATUS_A, 2, v);
 390         if (ret)
 391                 return ret;
 392
 393         *status = (v[1] << 8) | v[0];
 394         return 0;
 395 }
 396
 397 static void da903x_irq_work(struct work_struct *work)
 398 {
 399         struct da903x_chip *chip =
 400                 container_of(work, struct da903x_chip, irq_work);
 401         unsigned int events = 0;
 402
 403         while (1) {
 404                 if (chip->ops->read_events(chip, &events))
 405                         break;
 406
 407                 events &= ~chip->events_mask;
 408                 if (events == 0)
 409                         break;
 410
 411                 blocking_notifier_call_chain(
 412                                 &chip->notifier_list, events, NULL);
 413         }
 414         enable_irq(chip->client->irq);
 415 }
 416
 417 static irqreturn_t da903x_irq_handler(int irq, void *data)
 418 {
 419         struct da903x_chip *chip = data;
 420
 421         disable_irq_nosync(irq);
 422         (void)schedule_work(&chip->irq_work);
 423
 424         return IRQ_HANDLED;
 425 }
 426
 427 static const struct da903x_chip_ops da903x_ops[] = {
 428         [0] = {
 429                 .init_chip      = da9030_init_chip,
 430                 .unmask_events  = da9030_unmask_events,
 431                 .mask_events    = da9030_mask_events,
 432                 .read_events    = da9030_read_events,
 433                 .read_status    = da9030_read_status,
 434         },
 435         [1] = {
 436                 .init_chip      = da9034_init_chip,
 437                 .unmask_events  = da9034_unmask_events,
 438                 .mask_events    = da9034_mask_events,
 439                 .read_events    = da9034_read_events,
 440                 .read_status    = da9034_read_status,
 441         }
 442 };
 443
 444 static const struct i2c_device_id da903x_id_table[] = {
 445         { "da9030", 0 },
 446         { "da9034", 1 },
 447         { },
 448 };
 449 MODULE_DEVICE_TABLE(i2c, da903x_id_table);
 450
 451 static int __remove_subdev(struct device *dev, void *unused)
 452 {
 453         platform_device_unregister(to_platform_device(dev));
 454         return 0;
 455 }
 456
 457 static int da903x_remove_subdevs(struct da903x_chip *chip)
 458 {
 459         return device_for_each_child(chip->dev, NULL, __remove_subdev);
 460 }
 461
 462 static int da903x_add_subdevs(struct da903x_chip *chip,
 463                                         struct da903x_platform_data *pdata)
 464 {
 465         struct da903x_subdev_info *subdev;
 466         struct platform_device *pdev;
 467         int i, ret = 0;
 468
 469         for (i = 0; i < pdata->num_subdevs; i++) {
 470                 subdev = &pdata->subdevs[i];
 471
 472                 pdev = platform_device_alloc(subdev->name, subdev->id);
 473                 if (!pdev) {
 474                         ret = -ENOMEM;
 475                         goto failed;
 476                 }
 477
 478                 pdev->dev.parent = chip->dev;
 479                 pdev->dev.platform_data = subdev->platform_data;
 480
 481                 ret = platform_device_add(pdev);
 482                 if (ret) {
 483                         platform_device_put(pdev);
 484                         goto failed;
 485                 }
 486         }
 487         return 0;
 488
 489 failed:
 490         da903x_remove_subdevs(chip);
 491         return ret;
 492 }
 493
 494 static int da903x_probe(struct i2c_client *client,
 495                                   const struct i2c_device_id *id)
 496 {
 497         struct da903x_platform_data *pdata = dev_get_platdata(&client->dev);
 498         struct da903x_chip *chip;
 499         unsigned int tmp;
 500         int ret;
 501
 502         chip = devm_kzalloc(&client->dev, sizeof(struct da903x_chip),
 503                                 GFP_KERNEL);
 504         if (chip == NULL)
 505                 return -ENOMEM;
 506
 507         chip->client = client;
 508         chip->dev = &client->dev;
 509         chip->ops = &da903x_ops[id->driver_data];
 510
 511         mutex_init(&chip->lock);
 512         INIT_WORK(&chip->irq_work, da903x_irq_work);
 513         BLOCKING_INIT_NOTIFIER_HEAD(&chip->notifier_list);
 514
 515         i2c_set_clientdata(client, chip);
 516
 517         ret = chip->ops->init_chip(chip);
 518         if (ret)
 519                 return ret;
 520
 521         /* mask and clear all IRQs */
 522         chip->events_mask = 0xffffffff;
 523         chip->ops->mask_events(chip, chip->events_mask);
 524         chip->ops->read_events(chip, &tmp);
 525
 526         ret = devm_request_irq(&client->dev, client->irq, da903x_irq_handler,
 527                         IRQF_TRIGGER_FALLING,
 528                         "da903x", chip);
 529         if (ret) {
 530                 dev_err(&client->dev, "failed to request irq %d\n",
 531                                 client->irq);
 532                 return ret;
 533         }
 534
 535         return da903x_add_subdevs(chip, pdata);
 536 }
 537
 538 static int da903x_remove(struct i2c_client *client)
 539 {
 540         struct da903x_chip *chip = i2c_get_clientdata(client);
 541
 542         da903x_remove_subdevs(chip);
 543         return 0;
 544 }
 545
 546 static struct i2c_driver da903x_driver = {
 547         .driver = {
 548                 .name   = "da903x",
 549         },
 550         .probe          = da903x_probe,
 551         .remove         = da903x_remove,
 552         .id_table       = da903x_id_table,
 553 };
 554
 555 static int __init da903x_init(void)
 556 {
 557         return i2c_add_driver(&da903x_driver);
 558 }
 559 subsys_initcall(da903x_init);
 560
 561 static void __exit da903x_exit(void)
 562 {
 563         i2c_del_driver(&da903x_driver);
 564 }
 565 module_exit(da903x_exit);
 566
 567 MODULE_DESCRIPTION("PMIC Driver for Dialog Semiconductor DA9034");
 568 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
 569 MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
 570 MODULE_LICENSE("GPL v2");