release/src-rt-6.x.4708/linux/linux-2.6.36/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         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) == 0) {
 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 __devinit 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         __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         kfree(chip);
 537         return ret;
 538 }
 539
 540 static int __devexit da903x_remove(struct i2c_client *client)
 541 {
 542         struct da903x_chip *chip = i2c_get_clientdata(client);
 543
 544         da903x_remove_subdevs(chip);
 545         kfree(chip);
 546         return 0;
 547 }
 548
 549 static struct i2c_driver da903x_driver = {
 550         .driver = {
 551                 .name   = "da903x",
 552                 .owner  = THIS_MODULE,
 553         },
 554         .probe          = da903x_probe,
 555         .remove         = __devexit_p(da903x_remove),
 556         .id_table       = da903x_id_table,
 557 };
 558
 559 static int __init da903x_init(void)
 560 {
 561         return i2c_add_driver(&da903x_driver);
 562 }
 563 subsys_initcall(da903x_init);
 564
 565 static void __exit da903x_exit(void)
 566 {
 567         i2c_del_driver(&da903x_driver);
 568 }
 569 module_exit(da903x_exit);
 570
 571 MODULE_DESCRIPTION("PMIC Driver for Dialog Semiconductor DA9034");
 572 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>"
 573               "Mike Rapoport <mike@compulab.co.il>");
 574 MODULE_LICENSE("GPL");