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         irq_set_noprobe(virq);
 219
 220         return 0;
 221 }
 222
 223 static void tc3589x_irq_unmap(struct irq_domain *d, unsigned int virq)
 224 {
 225         irq_set_chip_and_handler(virq, NULL, NULL);
 226         irq_set_chip_data(virq, NULL);
 227 }
 228
 229 static const struct irq_domain_ops tc3589x_irq_ops = {
 230         .map    = tc3589x_irq_map,
 231         .unmap  = tc3589x_irq_unmap,
 232         .xlate  = irq_domain_xlate_onecell,
 233 };
 234
 235 static int tc3589x_irq_init(struct tc3589x *tc3589x, struct device_node *np)
 236 {
 237         tc3589x->domain = irq_domain_add_simple(
 238                 np, TC3589x_NR_INTERNAL_IRQS, 0,
 239                 &tc3589x_irq_ops, tc3589x);
 240
 241         if (!tc3589x->domain) {
 242                 dev_err(tc3589x->dev, "Failed to create irqdomain\n");
 243                 return -ENOSYS;
 244         }
 245
 246         return 0;
 247 }
 248
 249 static int tc3589x_chip_init(struct tc3589x *tc3589x)
 250 {
 251         int manf, ver, ret;
 252
 253         manf = tc3589x_reg_read(tc3589x, TC3589x_MANFCODE);
 254         if (manf < 0)
 255                 return manf;
 256
 257         ver = tc3589x_reg_read(tc3589x, TC3589x_VERSION);
 258         if (ver < 0)
 259                 return ver;
 260
 261         if (manf != TC3589x_MANFCODE_MAGIC) {
 262                 dev_err(tc3589x->dev, "unknown manufacturer: %#x\n", manf);
 263                 return -EINVAL;
 264         }
 265
 266         dev_info(tc3589x->dev, "manufacturer: %#x, version: %#x\n", manf, ver);
 267
 268         /*
 269          * Put everything except the IRQ module into reset;
 270          * also spare the GPIO module for any pin initialization
 271          * done during pre-kernel boot
 272          */
 273         ret = tc3589x_reg_write(tc3589x, TC3589x_RSTCTRL,
 274                                 TC3589x_RSTCTRL_TIMRST
 275                                 | TC3589x_RSTCTRL_ROTRST
 276                                 | TC3589x_RSTCTRL_KBDRST);
 277         if (ret < 0)
 278                 return ret;
 279
 280         /* Clear the reset interrupt. */
 281         return tc3589x_reg_write(tc3589x, TC3589x_RSTINTCLR, 0x1);
 282 }
 283
 284 static int tc3589x_device_init(struct tc3589x *tc3589x)
 285 {
 286         int ret = 0;
 287         unsigned int blocks = tc3589x->pdata->block;
 288
 289         if (blocks & TC3589x_BLOCK_GPIO) {
 290                 ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_gpio,
 291                                       ARRAY_SIZE(tc3589x_dev_gpio), NULL,
 292                                       0, tc3589x->domain);
 293                 if (ret) {
 294                         dev_err(tc3589x->dev, "failed to add gpio child\n");
 295                         return ret;
 296                 }
 297                 dev_info(tc3589x->dev, "added gpio block\n");
 298         }
 299
 300         if (blocks & TC3589x_BLOCK_KEYPAD) {
 301                 ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_keypad,
 302                                       ARRAY_SIZE(tc3589x_dev_keypad), NULL,
 303                                       0, tc3589x->domain);
 304                 if (ret) {
 305                         dev_err(tc3589x->dev, "failed to keypad child\n");
 306                         return ret;
 307                 }
 308                 dev_info(tc3589x->dev, "added keypad block\n");
 309         }
 310
 311         return ret;
 312 }
 313
 314 static const struct of_device_id tc3589x_match[] = {
 315         /* Legacy compatible string */
 316         { .compatible = "tc3589x", .data = (void *) TC3589X_UNKNOWN },
 317         { .compatible = "toshiba,tc35890", .data = (void *) TC3589X_TC35890 },
 318         { .compatible = "toshiba,tc35892", .data = (void *) TC3589X_TC35892 },
 319         { .compatible = "toshiba,tc35893", .data = (void *) TC3589X_TC35893 },
 320         { .compatible = "toshiba,tc35894", .data = (void *) TC3589X_TC35894 },
 321         { .compatible = "toshiba,tc35895", .data = (void *) TC3589X_TC35895 },
 322         { .compatible = "toshiba,tc35896", .data = (void *) TC3589X_TC35896 },
 323         { }
 324 };
 325
 326 MODULE_DEVICE_TABLE(of, tc3589x_match);
 327
 328 static struct tc3589x_platform_data *
 329 tc3589x_of_probe(struct device *dev, enum tc3589x_version *version)
 330 {
 331         struct device_node *np = dev->of_node;
 332         struct tc3589x_platform_data *pdata;
 333         struct device_node *child;
 334         const struct of_device_id *of_id;
 335
 336         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 337         if (!pdata)
 338                 return ERR_PTR(-ENOMEM);
 339
 340         of_id = of_match_device(tc3589x_match, dev);
 341         if (!of_id)
 342                 return ERR_PTR(-ENODEV);
 343         *version = (enum tc3589x_version) of_id->data;
 344
 345         for_each_child_of_node(np, child) {
 346                 if (of_device_is_compatible(child, "toshiba,tc3589x-gpio"))
 347                         pdata->block |= TC3589x_BLOCK_GPIO;
 348                 if (of_device_is_compatible(child, "toshiba,tc3589x-keypad"))
 349                         pdata->block |= TC3589x_BLOCK_KEYPAD;
 350         }
 351
 352         return pdata;
 353 }
 354
 355 static int tc3589x_probe(struct i2c_client *i2c,
 356                                    const struct i2c_device_id *id)
 357 {
 358         struct device_node *np = i2c->dev.of_node;
 359         struct tc3589x_platform_data *pdata = dev_get_platdata(&i2c->dev);
 360         struct tc3589x *tc3589x;
 361         enum tc3589x_version version;
 362         int ret;
 363
 364         if (!pdata) {
 365                 pdata = tc3589x_of_probe(&i2c->dev, &version);
 366                 if (IS_ERR(pdata)) {
 367                         dev_err(&i2c->dev, "No platform data or DT found\n");
 368                         return PTR_ERR(pdata);
 369                 }
 370         } else {
 371                 /* When not probing from device tree we have this ID */
 372                 version = id->driver_data;
 373         }
 374
 375         if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA
 376                                      | I2C_FUNC_SMBUS_I2C_BLOCK))
 377                 return -EIO;
 378
 379         tc3589x = devm_kzalloc(&i2c->dev, sizeof(struct tc3589x),
 380                                 GFP_KERNEL);
 381         if (!tc3589x)
 382                 return -ENOMEM;
 383
 384         mutex_init(&tc3589x->lock);
 385
 386         tc3589x->dev = &i2c->dev;
 387         tc3589x->i2c = i2c;
 388         tc3589x->pdata = pdata;
 389
 390         switch (version) {
 391         case TC3589X_TC35893:
 392         case TC3589X_TC35895:
 393         case TC3589X_TC35896:
 394                 tc3589x->num_gpio = 20;
 395                 break;
 396         case TC3589X_TC35890:
 397         case TC3589X_TC35892:
 398         case TC3589X_TC35894:
 399         case TC3589X_UNKNOWN:
 400         default:
 401                 tc3589x->num_gpio = 24;
 402                 break;
 403         }
 404
 405         i2c_set_clientdata(i2c, tc3589x);
 406
 407         ret = tc3589x_chip_init(tc3589x);
 408         if (ret)
 409                 return ret;
 410
 411         ret = tc3589x_irq_init(tc3589x, np);
 412         if (ret)
 413                 return ret;
 414
 415         ret = request_threaded_irq(tc3589x->i2c->irq, NULL, tc3589x_irq,
 416                                    IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 417                                    "tc3589x", tc3589x);
 418         if (ret) {
 419                 dev_err(tc3589x->dev, "failed to request IRQ: %d\n", ret);
 420                 return ret;
 421         }
 422
 423         ret = tc3589x_device_init(tc3589x);
 424         if (ret) {
 425                 dev_err(tc3589x->dev, "failed to add child devices\n");
 426                 return ret;
 427         }
 428
 429         return 0;
 430 }
 431
 432 static int tc3589x_remove(struct i2c_client *client)
 433 {
 434         struct tc3589x *tc3589x = i2c_get_clientdata(client);
 435
 436         mfd_remove_devices(tc3589x->dev);
 437
 438         return 0;
 439 }
 440
 441 #ifdef CONFIG_PM_SLEEP
 442 static int tc3589x_suspend(struct device *dev)
 443 {
 444         struct tc3589x *tc3589x = dev_get_drvdata(dev);
 445         struct i2c_client *client = tc3589x->i2c;
 446         int ret = 0;
 447
 448         /* put the system to sleep mode */
 449         if (!device_may_wakeup(&client->dev))
 450                 ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
 451                                 TC3589x_CLKMODE_MODCTL_SLEEP);
 452
 453         return ret;
 454 }
 455
 456 static int tc3589x_resume(struct device *dev)
 457 {
 458         struct tc3589x *tc3589x = dev_get_drvdata(dev);
 459         struct i2c_client *client = tc3589x->i2c;
 460         int ret = 0;
 461
 462         /* enable the system into operation */
 463         if (!device_may_wakeup(&client->dev))
 464                 ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
 465                                 TC3589x_CLKMODE_MODCTL_OPERATION);
 466
 467         return ret;
 468 }
 469 #endif
 470
 471 static SIMPLE_DEV_PM_OPS(tc3589x_dev_pm_ops, tc3589x_suspend, tc3589x_resume);
 472
 473 static const struct i2c_device_id tc3589x_id[] = {
 474         { "tc35890", TC3589X_TC35890 },
 475         { "tc35892", TC3589X_TC35892 },
 476         { "tc35893", TC3589X_TC35893 },
 477         { "tc35894", TC3589X_TC35894 },
 478         { "tc35895", TC3589X_TC35895 },
 479         { "tc35896", TC3589X_TC35896 },
 480         { "tc3589x", TC3589X_UNKNOWN },
 481         { }
 482 };
 483 MODULE_DEVICE_TABLE(i2c, tc3589x_id);
 484
 485 static struct i2c_driver tc3589x_driver = {
 486         .driver = {
 487                 .name   = "tc3589x",
 488                 .pm     = &tc3589x_dev_pm_ops,
 489                 .of_match_table = of_match_ptr(tc3589x_match),
 490         },
 491         .probe          = tc3589x_probe,
 492         .remove         = tc3589x_remove,
 493         .id_table       = tc3589x_id,
 494 };
 495
 496 static int __init tc3589x_init(void)
 497 {
 498         return i2c_add_driver(&tc3589x_driver);
 499 }
 500 subsys_initcall(tc3589x_init);
 501
 502 static void __exit tc3589x_exit(void)
 503 {
 504         i2c_del_driver(&tc3589x_driver);
 505 }
 506 module_exit(tc3589x_exit);
 507
 508 MODULE_LICENSE("GPL v2");
 509 MODULE_DESCRIPTION("TC3589x MFD core driver");
 510 MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");