drivers/mfd/tc3589x.c

   1 /*
   2  * Copyright (C) ST-Ericsson SA 2010
   3  *
   4  * License Terms: GNU General Public License, version 2
   5  * Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
   6  * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/irq.h>
  12 #include <linux/irqdomain.h>
  13 #include <linux/slab.h>
  14 #include <linux/i2c.h>
  15 #include <linux/of.h>
  16 #include <linux/of_device.h>
  17 #include <linux/mfd/core.h>
  18 #include <linux/mfd/tc3589x.h>
  19 #include <linux/err.h>
  20
  21 /**
  22  * enum tc3589x_version - indicates the TC3589x version
  23  */
  24 enum tc3589x_version {
  25         TC3589X_TC35890,
  26         TC3589X_TC35892,
  27         TC3589X_TC35893,
  28         TC3589X_TC35894,
  29         TC3589X_TC35895,
  30         TC3589X_TC35896,
  31         TC3589X_UNKNOWN,
  32 };
  33
  34 #define TC3589x_CLKMODE_MODCTL_SLEEP            0x0
  35 #define TC3589x_CLKMODE_MODCTL_OPERATION        (1 << 0)
  36
  37 /**
  38  * tc3589x_reg_read() - read a single TC3589x register
  39  * @tc3589x:    Device to read from
  40  * @reg:        Register to read
  41  */
  42 int tc3589x_reg_read(struct tc3589x *tc3589x, u8 reg)
  43 {
  44         int ret;
  45
  46         ret = i2c_smbus_read_byte_data(tc3589x->i2c, reg);
  47         if (ret < 0)
  48                 dev_err(tc3589x->dev, "failed to read reg %#x: %d\n",
  49                         reg, ret);
  50
  51         return ret;
  52 }
  53 EXPORT_SYMBOL_GPL(tc3589x_reg_read);
  54
  55 /**
  56  * tc3589x_reg_read() - write a single TC3589x register
  57  * @tc3589x:    Device to write to
  58  * @reg:        Register to read
  59  * @data:       Value to write
  60  */
  61 int tc3589x_reg_write(struct tc3589x *tc3589x, u8 reg, u8 data)
  62 {
  63         int ret;
  64
  65         ret = i2c_smbus_write_byte_data(tc3589x->i2c, reg, data);
  66         if (ret < 0)
  67                 dev_err(tc3589x->dev, "failed to write reg %#x: %d\n",
  68                         reg, ret);
  69
  70         return ret;
  71 }
  72 EXPORT_SYMBOL_GPL(tc3589x_reg_write);
  73
  74 /**
  75  * tc3589x_block_read() - read multiple TC3589x registers
  76  * @tc3589x:    Device to read from
  77  * @reg:        First register
  78  * @length:     Number of registers
  79  * @values:     Buffer to write to
  80  */
  81 int tc3589x_block_read(struct tc3589x *tc3589x, u8 reg, u8 length, u8 *values)
  82 {
  83         int ret;
  84
  85         ret = i2c_smbus_read_i2c_block_data(tc3589x->i2c, reg, length, values);
  86         if (ret < 0)
  87                 dev_err(tc3589x->dev, "failed to read regs %#x: %d\n",
  88                         reg, ret);
  89
  90         return ret;
  91 }
  92 EXPORT_SYMBOL_GPL(tc3589x_block_read);
  93
  94 /**
  95  * tc3589x_block_write() - write multiple TC3589x registers
  96  * @tc3589x:    Device to write to
  97  * @reg:        First register
  98  * @length:     Number of registers
  99  * @values:     Values to write
 100  */
 101 int tc3589x_block_write(struct tc3589x *tc3589x, u8 reg, u8 length,
 102                         const u8 *values)
 103 {
 104         int ret;
 105
 106         ret = i2c_smbus_write_i2c_block_data(tc3589x->i2c, reg, length,
 107                                              values);
 108         if (ret < 0)
 109                 dev_err(tc3589x->dev, "failed to write regs %#x: %d\n",
 110                         reg, ret);
 111
 112         return ret;
 113 }
 114 EXPORT_SYMBOL_GPL(tc3589x_block_write);
 115
 116 /**
 117  * tc3589x_set_bits() - set the value of a bitfield in a TC3589x register
 118  * @tc3589x:    Device to write to
 119  * @reg:        Register to write
 120  * @mask:       Mask of bits to set
 121  * @values:     Value to set
 122  */
 123 int tc3589x_set_bits(struct tc3589x *tc3589x, u8 reg, u8 mask, u8 val)
 124 {
 125         int ret;
 126
 127         mutex_lock(&tc3589x->lock);
 128
 129         ret = tc3589x_reg_read(tc3589x, reg);
 130         if (ret < 0)
 131                 goto out;
 132
 133         ret &= ~mask;
 134         ret |= val;
 135
 136         ret = tc3589x_reg_write(tc3589x, reg, ret);
 137
 138 out:
 139         mutex_unlock(&tc3589x->lock);
 140         return ret;
 141 }
 142 EXPORT_SYMBOL_GPL(tc3589x_set_bits);
 143
 144 static struct resource gpio_resources[] = {
 145         {
 146                 .start  = TC3589x_INT_GPIIRQ,
 147                 .end    = TC3589x_INT_GPIIRQ,
 148                 .flags  = IORESOURCE_IRQ,
 149         },
 150 };
 151
 152 static struct resource keypad_resources[] = {
 153         {
 154                 .start  = TC3589x_INT_KBDIRQ,
 155                 .end    = TC3589x_INT_KBDIRQ,
 156                 .flags  = IORESOURCE_IRQ,
 157         },
 158 };
 159
 160 static const struct mfd_cell tc3589x_dev_gpio[] = {
 161         {
 162                 .name           = "tc3589x-gpio",
 163                 .num_resources  = ARRAY_SIZE(gpio_resources),
 164                 .resources      = &gpio_resources[0],
 165                 .of_compatible  = "toshiba,tc3589x-gpio",
 166         },
 167 };
 168
 169 static const struct mfd_cell tc3589x_dev_keypad[] = {
 170         {
 171                 .name           = "tc3589x-keypad",
 172                 .num_resources  = ARRAY_SIZE(keypad_resources),
 173                 .resources      = &keypad_resources[0],
 174                 .of_compatible  = "toshiba,tc3589x-keypad",
 175         },
 176 };
 177
 178 static irqreturn_t tc3589x_irq(int irq, void *data)
 179 {
 180         struct tc3589x *tc3589x = data;
 181         int status;
 182
 183 again:
 184         status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
 185         if (status < 0)
 186                 return IRQ_NONE;
 187
 188         while (status) {
 189                 int bit = __ffs(status);
 190                 int virq = irq_create_mapping(tc3589x->domain, bit);
 191
 192                 handle_nested_irq(virq);
 193                 status &= ~(1 << bit);
 194         }
 195
 196         /*
 197          * A dummy read or write (to any register) appears to be necessary to
 198          * have the last interrupt clear (for example, GPIO IC write) take
 199          * effect. In such a case, recheck for any interrupt which is still
 200          * pending.
 201          */
 202         status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
 203         if (status)
 204                 goto again;
 205
 206         return IRQ_HANDLED;
 207 }
 208
 209 static int tc3589x_irq_map(struct irq_domain *d, unsigned int virq,
 210                                 irq_hw_number_t hwirq)
 211 {
 212         struct tc3589x *tc3589x = d->host_data;
 213
 214         irq_set_chip_data(virq, tc3589x);
 215         irq_set_chip_and_handler(virq, &dummy_irq_chip,
 216                                 handle_edge_irq);
 217         irq_set_nested_thread(virq, 1);
 218 #ifdef CONFIG_ARM
 219         set_irq_flags(virq, IRQF_VALID);
 220 #else
 221         irq_set_noprobe(virq);
 222 #endif
 223
 224         return 0;
 225 }
 226
 227 static void tc3589x_irq_unmap(struct irq_domain *d, unsigned int virq)
 228 {
 229 #ifdef CONFIG_ARM
 230         set_irq_flags(virq, 0);
 231 #endif
 232         irq_set_chip_and_handler(virq, NULL, NULL);
 233         irq_set_chip_data(virq, NULL);
 234 }
 235
 236 static struct irq_domain_ops tc3589x_irq_ops = {
 237         .map    = tc3589x_irq_map,
 238         .unmap  = tc3589x_irq_unmap,
 239         .xlate  = irq_domain_xlate_twocell,
 240 };
 241
 242 static int tc3589x_irq_init(struct tc3589x *tc3589x, struct device_node *np)
 243 {
 244         int base = tc3589x->irq_base;
 245
 246         tc3589x->domain = irq_domain_add_simple(
 247                 np, TC3589x_NR_INTERNAL_IRQS, base,
 248                 &tc3589x_irq_ops, tc3589x);
 249
 250         if (!tc3589x->domain) {
 251                 dev_err(tc3589x->dev, "Failed to create irqdomain\n");
 252                 return -ENOSYS;
 253         }
 254
 255         return 0;
 256 }
 257
 258 static int tc3589x_chip_init(struct tc3589x *tc3589x)
 259 {
 260         int manf, ver, ret;
 261
 262         manf = tc3589x_reg_read(tc3589x, TC3589x_MANFCODE);
 263         if (manf < 0)
 264                 return manf;
 265
 266         ver = tc3589x_reg_read(tc3589x, TC3589x_VERSION);
 267         if (ver < 0)
 268                 return ver;
 269
 270         if (manf != TC3589x_MANFCODE_MAGIC) {
 271                 dev_err(tc3589x->dev, "unknown manufacturer: %#x\n", manf);
 272                 return -EINVAL;
 273         }
 274
 275         dev_info(tc3589x->dev, "manufacturer: %#x, version: %#x\n", manf, ver);
 276
 277         /*
 278          * Put everything except the IRQ module into reset;
 279          * also spare the GPIO module for any pin initialization
 280          * done during pre-kernel boot
 281          */
 282         ret = tc3589x_reg_write(tc3589x, TC3589x_RSTCTRL,
 283                                 TC3589x_RSTCTRL_TIMRST
 284                                 | TC3589x_RSTCTRL_ROTRST
 285                                 | TC3589x_RSTCTRL_KBDRST);
 286         if (ret < 0)
 287                 return ret;
 288
 289         /* Clear the reset interrupt. */
 290         return tc3589x_reg_write(tc3589x, TC3589x_RSTINTCLR, 0x1);
 291 }
 292
 293 static int tc3589x_device_init(struct tc3589x *tc3589x)
 294 {
 295         int ret = 0;
 296         unsigned int blocks = tc3589x->pdata->block;
 297
 298         if (blocks & TC3589x_BLOCK_GPIO) {
 299                 ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_gpio,
 300                                       ARRAY_SIZE(tc3589x_dev_gpio), NULL,
 301                                       tc3589x->irq_base, tc3589x->domain);
 302                 if (ret) {
 303                         dev_err(tc3589x->dev, "failed to add gpio child\n");
 304                         return ret;
 305                 }
 306                 dev_info(tc3589x->dev, "added gpio block\n");
 307         }
 308
 309         if (blocks & TC3589x_BLOCK_KEYPAD) {
 310                 ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_keypad,
 311                                       ARRAY_SIZE(tc3589x_dev_keypad), NULL,
 312                                       tc3589x->irq_base, tc3589x->domain);
 313                 if (ret) {
 314                         dev_err(tc3589x->dev, "failed to keypad child\n");
 315                         return ret;
 316                 }
 317                 dev_info(tc3589x->dev, "added keypad block\n");
 318         }
 319
 320         return ret;
 321 }
 322
 323 #ifdef CONFIG_OF
 324 static const struct of_device_id tc3589x_match[] = {
 325         /* Legacy compatible string */
 326         { .compatible = "tc3589x", .data = (void *) TC3589X_UNKNOWN },
 327         { .compatible = "toshiba,tc35890", .data = (void *) TC3589X_TC35890 },
 328         { .compatible = "toshiba,tc35892", .data = (void *) TC3589X_TC35892 },
 329         { .compatible = "toshiba,tc35893", .data = (void *) TC3589X_TC35893 },
 330         { .compatible = "toshiba,tc35894", .data = (void *) TC3589X_TC35894 },
 331         { .compatible = "toshiba,tc35895", .data = (void *) TC3589X_TC35895 },
 332         { .compatible = "toshiba,tc35896", .data = (void *) TC3589X_TC35896 },
 333         { }
 334 };
 335
 336 MODULE_DEVICE_TABLE(of, tc3589x_match);
 337
 338 static struct tc3589x_platform_data *
 339 tc3589x_of_probe(struct device *dev, enum tc3589x_version *version)
 340 {
 341         struct device_node *np = dev->of_node;
 342         struct tc3589x_platform_data *pdata;
 343         struct device_node *child;
 344         const struct of_device_id *of_id;
 345
 346         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 347         if (!pdata)
 348                 return ERR_PTR(-ENOMEM);
 349
 350         of_id = of_match_device(tc3589x_match, dev);
 351         if (!of_id)
 352                 return ERR_PTR(-ENODEV);
 353         *version = (enum tc3589x_version) of_id->data;
 354
 355         for_each_child_of_node(np, child) {
 356                 if (of_device_is_compatible(child, "toshiba,tc3589x-gpio"))
 357                         pdata->block |= TC3589x_BLOCK_GPIO;
 358                 if (of_device_is_compatible(child, "toshiba,tc3589x-keypad"))
 359                         pdata->block |= TC3589x_BLOCK_KEYPAD;
 360         }
 361
 362         return pdata;
 363 }
 364 #else
 365 static inline struct tc3589x_platform_data *
 366 tc3589x_of_probe(struct device *dev, enum tc3589x_version *version)
 367 {
 368         dev_err(dev, "no device tree support\n");
 369         return ERR_PTR(-ENODEV);
 370 }
 371 #endif
 372
 373 static int tc3589x_probe(struct i2c_client *i2c,
 374                                    const struct i2c_device_id *id)
 375 {
 376         struct device_node *np = i2c->dev.of_node;
 377         struct tc3589x_platform_data *pdata = dev_get_platdata(&i2c->dev);
 378         struct tc3589x *tc3589x;
 379         enum tc3589x_version version;
 380         int ret;
 381
 382         if (!pdata) {
 383                 pdata = tc3589x_of_probe(&i2c->dev, &version);
 384                 if (IS_ERR(pdata)) {
 385                         dev_err(&i2c->dev, "No platform data or DT found\n");
 386                         return PTR_ERR(pdata);
 387                 }
 388         } else {
 389                 /* When not probing from device tree we have this ID */
 390                 version = id->driver_data;
 391         }
 392
 393         if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA
 394                                      | I2C_FUNC_SMBUS_I2C_BLOCK))
 395                 return -EIO;
 396
 397         tc3589x = devm_kzalloc(&i2c->dev, sizeof(struct tc3589x),
 398                                 GFP_KERNEL);
 399         if (!tc3589x)
 400                 return -ENOMEM;
 401
 402         mutex_init(&tc3589x->lock);
 403
 404         tc3589x->dev = &i2c->dev;
 405         tc3589x->i2c = i2c;
 406         tc3589x->pdata = pdata;
 407         tc3589x->irq_base = pdata->irq_base;
 408
 409         switch (version) {
 410         case TC3589X_TC35893:
 411         case TC3589X_TC35895:
 412         case TC3589X_TC35896:
 413                 tc3589x->num_gpio = 20;
 414                 break;
 415         case TC3589X_TC35890:
 416         case TC3589X_TC35892:
 417         case TC3589X_TC35894:
 418         case TC3589X_UNKNOWN:
 419         default:
 420                 tc3589x->num_gpio = 24;
 421                 break;
 422         }
 423
 424         i2c_set_clientdata(i2c, tc3589x);
 425
 426         ret = tc3589x_chip_init(tc3589x);
 427         if (ret)
 428                 return ret;
 429
 430         ret = tc3589x_irq_init(tc3589x, np);
 431         if (ret)
 432                 return ret;
 433
 434         ret = request_threaded_irq(tc3589x->i2c->irq, NULL, tc3589x_irq,
 435                                    IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 436                                    "tc3589x", tc3589x);
 437         if (ret) {
 438                 dev_err(tc3589x->dev, "failed to request IRQ: %d\n", ret);
 439                 return ret;
 440         }
 441
 442         ret = tc3589x_device_init(tc3589x);
 443         if (ret) {
 444                 dev_err(tc3589x->dev, "failed to add child devices\n");
 445                 return ret;
 446         }
 447
 448         return 0;
 449 }
 450
 451 static int tc3589x_remove(struct i2c_client *client)
 452 {
 453         struct tc3589x *tc3589x = i2c_get_clientdata(client);
 454
 455         mfd_remove_devices(tc3589x->dev);
 456
 457         return 0;
 458 }
 459
 460 #ifdef CONFIG_PM_SLEEP
 461 static int tc3589x_suspend(struct device *dev)
 462 {
 463         struct tc3589x *tc3589x = dev_get_drvdata(dev);
 464         struct i2c_client *client = tc3589x->i2c;
 465         int ret = 0;
 466
 467         /* put the system to sleep mode */
 468         if (!device_may_wakeup(&client->dev))
 469                 ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
 470                                 TC3589x_CLKMODE_MODCTL_SLEEP);
 471
 472         return ret;
 473 }
 474
 475 static int tc3589x_resume(struct device *dev)
 476 {
 477         struct tc3589x *tc3589x = dev_get_drvdata(dev);
 478         struct i2c_client *client = tc3589x->i2c;
 479         int ret = 0;
 480
 481         /* enable the system into operation */
 482         if (!device_may_wakeup(&client->dev))
 483                 ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
 484                                 TC3589x_CLKMODE_MODCTL_OPERATION);
 485
 486         return ret;
 487 }
 488 #endif
 489
 490 static SIMPLE_DEV_PM_OPS(tc3589x_dev_pm_ops, tc3589x_suspend, tc3589x_resume);
 491
 492 static const struct i2c_device_id tc3589x_id[] = {
 493         { "tc35890", TC3589X_TC35890 },
 494         { "tc35892", TC3589X_TC35892 },
 495         { "tc35893", TC3589X_TC35893 },
 496         { "tc35894", TC3589X_TC35894 },
 497         { "tc35895", TC3589X_TC35895 },
 498         { "tc35896", TC3589X_TC35896 },
 499         { "tc3589x", TC3589X_UNKNOWN },
 500         { }
 501 };
 502 MODULE_DEVICE_TABLE(i2c, tc3589x_id);
 503
 504 static struct i2c_driver tc3589x_driver = {
 505         .driver = {
 506                 .name   = "tc3589x",
 507                 .owner  = THIS_MODULE,
 508                 .pm     = &tc3589x_dev_pm_ops,
 509                 .of_match_table = of_match_ptr(tc3589x_match),
 510         },
 511         .probe          = tc3589x_probe,
 512         .remove         = tc3589x_remove,
 513         .id_table       = tc3589x_id,
 514 };
 515
 516 static int __init tc3589x_init(void)
 517 {
 518         return i2c_add_driver(&tc3589x_driver);
 519 }
 520 subsys_initcall(tc3589x_init);
 521
 522 static void __exit tc3589x_exit(void)
 523 {
 524         i2c_del_driver(&tc3589x_driver);
 525 }
 526 module_exit(tc3589x_exit);
 527
 528 MODULE_LICENSE("GPL v2");
 529 MODULE_DESCRIPTION("TC3589x MFD core driver");
 530 MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");