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 const 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"); 519