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_read(struct device *dev, int reg, uint8_t *val)
 155 {
 156         return __da903x_read(to_i2c_client(dev), reg, val);
 157 }
 158 EXPORT_SYMBOL_GPL(da903x_read);
 159
 160 int da903x_set_bits(struct device *dev, int reg, uint8_t bit_mask)
 161 {
 162         struct da903x_chip *chip = dev_get_drvdata(dev);
 163         uint8_t reg_val;
 164         int ret = 0;
 165
 166         mutex_lock(&chip->lock);
 167
 168         ret = __da903x_read(chip->client, reg, &reg_val);
 169         if (ret)
 170                 goto out;
 171
 172         if ((reg_val & bit_mask) == 0) {
 173                 reg_val |= bit_mask;
 174                 ret = __da903x_write(chip->client, reg, reg_val);
 175         }
 176 out:
 177         mutex_unlock(&chip->lock);
 178         return ret;
 179 }
 180 EXPORT_SYMBOL_GPL(da903x_set_bits);
 181
 182 int da903x_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
 183 {
 184         struct da903x_chip *chip = dev_get_drvdata(dev);
 185         uint8_t reg_val;
 186         int ret = 0;
 187
 188         mutex_lock(&chip->lock);
 189
 190         ret = __da903x_read(chip->client, reg, &reg_val);
 191         if (ret)
 192                 goto out;
 193
 194         if (reg_val & bit_mask) {
 195                 reg_val &= ~bit_mask;
 196                 ret = __da903x_write(chip->client, reg, reg_val);
 197         }
 198 out:
 199         mutex_unlock(&chip->lock);
 200         return ret;
 201 }
 202 EXPORT_SYMBOL_GPL(da903x_clr_bits);
 203
 204 int da903x_update(struct device *dev, int reg, uint8_t val, uint8_t mask)
 205 {
 206         struct da903x_chip *chip = dev_get_drvdata(dev);
 207         uint8_t reg_val;
 208         int ret = 0;
 209
 210         mutex_lock(&chip->lock);
 211
 212         ret = __da903x_read(chip->client, reg, &reg_val);
 213         if (ret)
 214                 goto out;
 215
 216         if ((reg_val & mask) != val) {
 217                 reg_val = (reg_val & ~mask) | val;
 218                 ret = __da903x_write(chip->client, reg, reg_val);
 219         }
 220 out:
 221         mutex_unlock(&chip->lock);
 222         return ret;
 223 }
 224 EXPORT_SYMBOL_GPL(da903x_update);
 225
 226 int da903x_query_status(struct device *dev, unsigned int sbits)
 227 {
 228         struct da903x_chip *chip = dev_get_drvdata(dev);
 229         unsigned int status = 0;
 230
 231         chip->ops->read_status(chip, &status);
 232         return ((status & sbits) == sbits);
 233 }
 234 EXPORT_SYMBOL(da903x_query_status);
 235
 236 static int __devinit da9030_init_chip(struct da903x_chip *chip)
 237 {
 238         uint8_t chip_id;
 239         int err;
 240
 241         err = __da903x_read(chip->client, DA9030_CHIP_ID, &chip_id);
 242         if (err)
 243                 return err;
 244
 245         err = __da903x_write(chip->client, DA9030_SYS_CTRL_A, 0xE8);
 246         if (err)
 247                 return err;
 248
 249         dev_info(chip->dev, "DA9030 (CHIP ID: 0x%02x) detected\n", chip_id);
 250         return 0;
 251 }
 252
 253 static int da9030_unmask_events(struct da903x_chip *chip, unsigned int events)
 254 {
 255         uint8_t v[3];
 256
 257         chip->events_mask &= ~events;
 258
 259         v[0] = (chip->events_mask & 0xff);
 260         v[1] = (chip->events_mask >> 8) & 0xff;
 261         v[2] = (chip->events_mask >> 16) & 0xff;
 262
 263         return __da903x_writes(chip->client, DA9030_IRQ_MASK_A, 3, v);
 264 }
 265
 266 static int da9030_mask_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_read_events(struct da903x_chip *chip, unsigned int *events)
 280 {
 281         uint8_t v[3] = {0, 0, 0};
 282         int ret;
 283
 284         ret = __da903x_reads(chip->client, DA9030_EVENT_A, 3, v);
 285         if (ret < 0)
 286                 return ret;
 287
 288         *events = (v[2] << 16) | (v[1] << 8) | v[0];
 289         return 0;
 290 }
 291
 292 static int da9030_read_status(struct da903x_chip *chip, unsigned int *status)
 293 {
 294         return __da903x_read(chip->client, DA9030_STATUS, (uint8_t *)status);
 295 }
 296
 297 static int da9034_init_chip(struct da903x_chip *chip)
 298 {
 299         uint8_t chip_id;
 300         int err;
 301
 302         err = __da903x_read(chip->client, DA9034_CHIP_ID, &chip_id);
 303         if (err)
 304                 return err;
 305
 306         err = __da903x_write(chip->client, DA9034_SYS_CTRL_A, 0xE8);
 307         if (err)
 308                 return err;
 309
 310         /* avoid SRAM power off during sleep*/
 311         __da903x_write(chip->client, 0x10, 0x07);
 312         __da903x_write(chip->client, 0x11, 0xff);
 313         __da903x_write(chip->client, 0x12, 0xff);
 314
 315         /* Enable the ONKEY power down functionality */
 316         __da903x_write(chip->client, DA9034_SYS_CTRL_B, 0x20);
 317         __da903x_write(chip->client, DA9034_SYS_CTRL_A, 0x60);
 318
 319         /* workaround to make LEDs work */
 320         __da903x_write(chip->client, 0x90, 0x01);
 321         __da903x_write(chip->client, 0xB0, 0x08);
 322
 323         /* make ADTV1 and SDTV1 effective */
 324         __da903x_write(chip->client, 0x20, 0x00);
 325
 326         dev_info(chip->dev, "DA9034 (CHIP ID: 0x%02x) detected\n", chip_id);
 327         return 0;
 328 }
 329
 330 static int da9034_unmask_events(struct da903x_chip *chip, unsigned int events)
 331 {
 332         uint8_t v[4];
 333
 334         chip->events_mask &= ~events;
 335
 336         v[0] = (chip->events_mask & 0xff);
 337         v[1] = (chip->events_mask >> 8) & 0xff;
 338         v[2] = (chip->events_mask >> 16) & 0xff;
 339         v[3] = (chip->events_mask >> 24) & 0xff;
 340
 341         return __da903x_writes(chip->client, DA9034_IRQ_MASK_A, 4, v);
 342 }
 343
 344 static int da9034_mask_events(struct da903x_chip *chip, unsigned int events)
 345 {
 346         uint8_t v[4];
 347
 348         chip->events_mask |= events;
 349
 350         v[0] = (chip->events_mask & 0xff);
 351         v[1] = (chip->events_mask >> 8) & 0xff;
 352         v[2] = (chip->events_mask >> 16) & 0xff;
 353         v[3] = (chip->events_mask >> 24) & 0xff;
 354
 355         return __da903x_writes(chip->client, DA9034_IRQ_MASK_A, 4, v);
 356 }
 357
 358 static int da9034_read_events(struct da903x_chip *chip, unsigned int *events)
 359 {
 360         uint8_t v[4] = {0, 0, 0, 0};
 361         int ret;
 362
 363         ret = __da903x_reads(chip->client, DA9034_EVENT_A, 4, v);
 364         if (ret < 0)
 365                 return ret;
 366
 367         *events = (v[3] << 24) | (v[2] << 16) | (v[1] << 8) | v[0];
 368         return 0;
 369 }
 370
 371 static int da9034_read_status(struct da903x_chip *chip, unsigned int *status)
 372 {
 373         uint8_t v[2] = {0, 0};
 374         int ret = 0;
 375
 376         ret = __da903x_reads(chip->client, DA9034_STATUS_A, 2, v);
 377         if (ret)
 378                 return ret;
 379
 380         *status = (v[1] << 8) | v[0];
 381         return 0;
 382 }
 383
 384 static void da903x_irq_work(struct work_struct *work)
 385 {
 386         struct da903x_chip *chip =
 387                 container_of(work, struct da903x_chip, irq_work);
 388         unsigned int events = 0;
 389
 390         while (1) {
 391                 if (chip->ops->read_events(chip, &events))
 392                         break;
 393
 394                 events &= ~chip->events_mask;
 395                 if (events == 0)
 396                         break;
 397
 398                 blocking_notifier_call_chain(
 399                                 &chip->notifier_list, events, NULL);
 400         }
 401         enable_irq(chip->client->irq);
 402 }
 403
 404 static int da903x_irq_handler(int irq, void *data)
 405 {
 406         struct da903x_chip *chip = data;
 407
 408         disable_irq_nosync(irq);
 409         (void)schedule_work(&chip->irq_work);
 410
 411         return IRQ_HANDLED;
 412 }
 413
 414 static struct da903x_chip_ops da903x_ops[] = {
 415         [0] = {
 416                 .init_chip      = da9030_init_chip,
 417                 .unmask_events  = da9030_unmask_events,
 418                 .mask_events    = da9030_mask_events,
 419                 .read_events    = da9030_read_events,
 420                 .read_status    = da9030_read_status,
 421         },
 422         [1] = {
 423                 .init_chip      = da9034_init_chip,
 424                 .unmask_events  = da9034_unmask_events,
 425                 .mask_events    = da9034_mask_events,
 426                 .read_events    = da9034_read_events,
 427                 .read_status    = da9034_read_status,
 428         }
 429 };
 430
 431 static const struct i2c_device_id da903x_id_table[] = {
 432         { "da9030", 0 },
 433         { "da9034", 1 },
 434         { },
 435 };
 436 MODULE_DEVICE_TABLE(i2c, da903x_id_table);
 437
 438 static int __devexit __remove_subdev(struct device *dev, void *unused)
 439 {
 440         platform_device_unregister(to_platform_device(dev));
 441         return 0;
 442 }
 443
 444 static int __devexit da903x_remove_subdevs(struct da903x_chip *chip)
 445 {
 446         return device_for_each_child(chip->dev, NULL, __remove_subdev);
 447 }
 448
 449 static int __devinit da903x_add_subdevs(struct da903x_chip *chip,
 450                                         struct da903x_platform_data *pdata)
 451 {
 452         struct da903x_subdev_info *subdev;
 453         struct platform_device *pdev;
 454         int i, ret = 0;
 455
 456         for (i = 0; i < pdata->num_subdevs; i++) {
 457                 subdev = &pdata->subdevs[i];
 458
 459                 pdev = platform_device_alloc(subdev->name, subdev->id);
 460
 461                 pdev->dev.parent = chip->dev;
 462                 pdev->dev.platform_data = subdev->platform_data;
 463
 464                 ret = platform_device_add(pdev);
 465                 if (ret)
 466                         goto failed;
 467         }
 468         return 0;
 469
 470 failed:
 471         da903x_remove_subdevs(chip);
 472         return ret;
 473 }
 474
 475 static int __devinit da903x_probe(struct i2c_client *client,
 476                                   const struct i2c_device_id *id)
 477 {
 478         struct da903x_platform_data *pdata = client->dev.platform_data;
 479         struct da903x_chip *chip;
 480         unsigned int tmp;
 481         int ret;
 482
 483         chip = kzalloc(sizeof(struct da903x_chip), GFP_KERNEL);
 484         if (chip == NULL)
 485                 return -ENOMEM;
 486
 487         chip->client = client;
 488         chip->dev = &client->dev;
 489         chip->ops = &da903x_ops[id->driver_data];
 490
 491         mutex_init(&chip->lock);
 492         INIT_WORK(&chip->irq_work, da903x_irq_work);
 493         BLOCKING_INIT_NOTIFIER_HEAD(&chip->notifier_list);
 494
 495         i2c_set_clientdata(client, chip);
 496
 497         ret = chip->ops->init_chip(chip);
 498         if (ret)
 499                 goto out_free_chip;
 500
 501         /* mask and clear all IRQs */
 502         chip->events_mask = 0xffffffff;
 503         chip->ops->mask_events(chip, chip->events_mask);
 504         chip->ops->read_events(chip, &tmp);
 505
 506         ret = request_irq(client->irq, da903x_irq_handler,
 507                         IRQF_DISABLED | IRQF_TRIGGER_FALLING,
 508                         "da903x", chip);
 509         if (ret) {
 510                 dev_err(&client->dev, "failed to request irq %d\n",
 511                                 client->irq);
 512                 goto out_free_chip;
 513         }
 514
 515         ret = da903x_add_subdevs(chip, pdata);
 516         if (ret)
 517                 goto out_free_irq;
 518
 519         return 0;
 520
 521 out_free_irq:
 522         free_irq(client->irq, chip);
 523 out_free_chip:
 524         i2c_set_clientdata(client, NULL);
 525         kfree(chip);
 526         return ret;
 527 }
 528
 529 static int __devexit da903x_remove(struct i2c_client *client)
 530 {
 531         struct da903x_chip *chip = i2c_get_clientdata(client);
 532
 533         da903x_remove_subdevs(chip);
 534         kfree(chip);
 535         return 0;
 536 }
 537
 538 static struct i2c_driver da903x_driver = {
 539         .driver = {
 540                 .name   = "da903x",
 541                 .owner  = THIS_MODULE,
 542         },
 543         .probe          = da903x_probe,
 544         .remove         = __devexit_p(da903x_remove),
 545         .id_table       = da903x_id_table,
 546 };
 547
 548 static int __init da903x_init(void)
 549 {
 550         return i2c_add_driver(&da903x_driver);
 551 }
 552 module_init(da903x_init);
 553
 554 static void __exit da903x_exit(void)
 555 {
 556         i2c_del_driver(&da903x_driver);
 557 }
 558 module_exit(da903x_exit);
 559
 560 MODULE_DESCRIPTION("PMIC Driver for Dialog Semiconductor DA9034");
 561 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>"
 562               "Mike Rapoport <mike@compulab.co.il>");
 563 MODULE_LICENSE("GPL");