kernel/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_onecell,
 240 };
 241
 242 static int tc3589x_irq_init(struct tc3589x *tc3589x, struct device_node *np)
 243 {
 244         tc3589x->domain = irq_domain_add_simple(
 245                 np, TC3589x_NR_INTERNAL_IRQS, 0,
 246                 &tc3589x_irq_ops, tc3589x);
 247
 248         if (!tc3589x->domain) {
 249                 dev_err(tc3589x->dev, "Failed to create irqdomain\n");
 250                 return -ENOSYS;
 251         }
 252
 253         return 0;
 254 }
 255
 256 static int tc3589x_chip_init(struct tc3589x *tc3589x)
 257 {
 258         int manf, ver, ret;
 259
 260         manf = tc3589x_reg_read(tc3589x, TC3589x_MANFCODE);
 261         if (manf < 0)
 262                 return manf;
 263
 264         ver = tc3589x_reg_read(tc3589x, TC3589x_VERSION);
 265         if (ver < 0)
 266                 return ver;
 267
 268         if (manf != TC3589x_MANFCODE_MAGIC) {
 269                 dev_err(tc3589x->dev, "unknown manufacturer: %#x\n", manf);
 270                 return -EINVAL;
 271         }
 272
 273         dev_info(tc3589x->dev, "manufacturer: %#x, version: %#x\n", manf, ver);
 274
 275         /*
 276          * Put everything except the IRQ module into reset;
 277          * also spare the GPIO module for any pin initialization
 278          * done during pre-kernel boot
 279          */
 280         ret = tc3589x_reg_write(tc3589x, TC3589x_RSTCTRL,
 281                                 TC3589x_RSTCTRL_TIMRST
 282                                 | TC3589x_RSTCTRL_ROTRST
 283                                 | TC3589x_RSTCTRL_KBDRST);
 284         if (ret < 0)
 285                 return ret;
 286
 287         /* Clear the reset interrupt. */
 288         return tc3589x_reg_write(tc3589x, TC3589x_RSTINTCLR, 0x1);
 289 }
 290
 291 static int tc3589x_device_init(struct tc3589x *tc3589x)
 292 {
 293         int ret = 0;
 294         unsigned int blocks = tc3589x->pdata->block;
 295
 296         if (blocks & TC3589x_BLOCK_GPIO) {
 297                 ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_gpio,
 298                                       ARRAY_SIZE(tc3589x_dev_gpio), NULL,
 299                                       0, tc3589x->domain);
 300                 if (ret) {
 301                         dev_err(tc3589x->dev, "failed to add gpio child\n");
 302                         return ret;
 303                 }
 304                 dev_info(tc3589x->dev, "added gpio block\n");
 305         }
 306
 307         if (blocks & TC3589x_BLOCK_KEYPAD) {
 308                 ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_keypad,
 309                                       ARRAY_SIZE(tc3589x_dev_keypad), NULL,
 310                                       0, tc3589x->domain);
 311                 if (ret) {
 312                         dev_err(tc3589x->dev, "failed to keypad child\n");
 313                         return ret;
 314                 }
 315                 dev_info(tc3589x->dev, "added keypad block\n");
 316         }
 317
 318         return ret;
 319 }
 320
 321 static const struct of_device_id tc3589x_match[] = {
 322         /* Legacy compatible string */
 323         { .compatible = "tc3589x", .data = (void *) TC3589X_UNKNOWN },
 324         { .compatible = "toshiba,tc35890", .data = (void *) TC3589X_TC35890 },
 325         { .compatible = "toshiba,tc35892", .data = (void *) TC3589X_TC35892 },
 326         { .compatible = "toshiba,tc35893", .data = (void *) TC3589X_TC35893 },
 327         { .compatible = "toshiba,tc35894", .data = (void *) TC3589X_TC35894 },
 328         { .compatible = "toshiba,tc35895", .data = (void *) TC3589X_TC35895 },
 329         { .compatible = "toshiba,tc35896", .data = (void *) TC3589X_TC35896 },
 330         { }
 331 };
 332
 333 MODULE_DEVICE_TABLE(of, tc3589x_match);
 334
 335 static struct tc3589x_platform_data *
 336 tc3589x_of_probe(struct device *dev, enum tc3589x_version *version)
 337 {
 338         struct device_node *np = dev->of_node;
 339         struct tc3589x_platform_data *pdata;
 340         struct device_node *child;
 341         const struct of_device_id *of_id;
 342
 343         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 344         if (!pdata)
 345                 return ERR_PTR(-ENOMEM);
 346
 347         of_id = of_match_device(tc3589x_match, dev);
 348         if (!of_id)
 349                 return ERR_PTR(-ENODEV);
 350         *version = (enum tc3589x_version) of_id->data;
 351
 352         for_each_child_of_node(np, child) {
 353                 if (of_device_is_compatible(child, "toshiba,tc3589x-gpio"))
 354                         pdata->block |= TC3589x_BLOCK_GPIO;
 355                 if (of_device_is_compatible(child, "toshiba,tc3589x-keypad"))
 356                         pdata->block |= TC3589x_BLOCK_KEYPAD;
 357         }
 358
 359         return pdata;
 360 }
 361
 362 static int tc3589x_probe(struct i2c_client *i2c,
 363                                    const struct i2c_device_id *id)
 364 {
 365         struct device_node *np = i2c->dev.of_node;
 366         struct tc3589x_platform_data *pdata = dev_get_platdata(&i2c->dev);
 367         struct tc3589x *tc3589x;
 368         enum tc3589x_version version;
 369         int ret;
 370
 371         if (!pdata) {
 372                 pdata = tc3589x_of_probe(&i2c->dev, &version);
 373                 if (IS_ERR(pdata)) {
 374                         dev_err(&i2c->dev, "No platform data or DT found\n");
 375                         return PTR_ERR(pdata);
 376                 }
 377         } else {
 378                 /* When not probing from device tree we have this ID */
 379                 version = id->driver_data;
 380         }
 381
 382         if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA
 383                                      | I2C_FUNC_SMBUS_I2C_BLOCK))
 384                 return -EIO;
 385
 386         tc3589x = devm_kzalloc(&i2c->dev, sizeof(struct tc3589x),
 387                                 GFP_KERNEL);
 388         if (!tc3589x)
 389                 return -ENOMEM;
 390
 391         mutex_init(&tc3589x->lock);
 392
 393         tc3589x->dev = &i2c->dev;
 394         tc3589x->i2c = i2c;
 395         tc3589x->pdata = pdata;
 396
 397         switch (version) {
 398         case TC3589X_TC35893:
 399         case TC3589X_TC35895:
 400         case TC3589X_TC35896:
 401                 tc3589x->num_gpio = 20;
 402                 break;
 403         case TC3589X_TC35890:
 404         case TC3589X_TC35892:
 405         case TC3589X_TC35894:
 406         case TC3589X_UNKNOWN:
 407         default:
 408                 tc3589x->num_gpio = 24;
 409                 break;
 410         }
 411
 412         i2c_set_clientdata(i2c, tc3589x);
 413
 414         ret = tc3589x_chip_init(tc3589x);
 415         if (ret)
 416                 return ret;
 417
 418         ret = tc3589x_irq_init(tc3589x, np);
 419         if (ret)
 420                 return ret;
 421
 422         ret = request_threaded_irq(tc3589x->i2c->irq, NULL, tc3589x_irq,
 423                                    IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 424                                    "tc3589x", tc3589x);
 425         if (ret) {
 426                 dev_err(tc3589x->dev, "failed to request IRQ: %d\n", ret);
 427                 return ret;
 428         }
 429
 430         ret = tc3589x_device_init(tc3589x);
 431         if (ret) {
 432                 dev_err(tc3589x->dev, "failed to add child devices\n");
 433                 return ret;
 434         }
 435
 436         return 0;
 437 }
 438
 439 static int tc3589x_remove(struct i2c_client *client)
 440 {
 441         struct tc3589x *tc3589x = i2c_get_clientdata(client);
 442
 443         mfd_remove_devices(tc3589x->dev);
 444
 445         return 0;
 446 }
 447
 448 #ifdef CONFIG_PM_SLEEP
 449 static int tc3589x_suspend(struct device *dev)
 450 {
 451         struct tc3589x *tc3589x = dev_get_drvdata(dev);
 452         struct i2c_client *client = tc3589x->i2c;
 453         int ret = 0;
 454
 455         /* put the system to sleep mode */
 456         if (!device_may_wakeup(&client->dev))
 457                 ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
 458                                 TC3589x_CLKMODE_MODCTL_SLEEP);
 459
 460         return ret;
 461 }
 462
 463 static int tc3589x_resume(struct device *dev)
 464 {
 465         struct tc3589x *tc3589x = dev_get_drvdata(dev);
 466         struct i2c_client *client = tc3589x->i2c;
 467         int ret = 0;
 468
 469         /* enable the system into operation */
 470         if (!device_may_wakeup(&client->dev))
 471                 ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
 472                                 TC3589x_CLKMODE_MODCTL_OPERATION);
 473
 474         return ret;
 475 }
 476 #endif
 477
 478 static SIMPLE_DEV_PM_OPS(tc3589x_dev_pm_ops, tc3589x_suspend, tc3589x_resume);
 479
 480 static const struct i2c_device_id tc3589x_id[] = {
 481         { "tc35890", TC3589X_TC35890 },
 482         { "tc35892", TC3589X_TC35892 },
 483         { "tc35893", TC3589X_TC35893 },
 484         { "tc35894", TC3589X_TC35894 },
 485         { "tc35895", TC3589X_TC35895 },
 486         { "tc35896", TC3589X_TC35896 },
 487         { "tc3589x", TC3589X_UNKNOWN },
 488         { }
 489 };
 490 MODULE_DEVICE_TABLE(i2c, tc3589x_id);
 491
 492 static struct i2c_driver tc3589x_driver = {
 493         .driver = {
 494                 .name   = "tc3589x",
 495                 .owner  = THIS_MODULE,
 496                 .pm     = &tc3589x_dev_pm_ops,
 497                 .of_match_table = of_match_ptr(tc3589x_match),
 498         },
 499         .probe          = tc3589x_probe,
 500         .remove         = tc3589x_remove,
 501         .id_table       = tc3589x_id,
 502 };
 503
 504 static int __init tc3589x_init(void)
 505 {
 506         return i2c_add_driver(&tc3589x_driver);
 507 }
 508 subsys_initcall(tc3589x_init);
 509
 510 static void __exit tc3589x_exit(void)
 511 {
 512         i2c_del_driver(&tc3589x_driver);
 513 }
 514 module_exit(tc3589x_exit);
 515
 516 MODULE_LICENSE("GPL v2");
 517 MODULE_DESCRIPTION("TC3589x MFD core driver");
 518 MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");