1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) ST-Ericsson SA 2010 4 * 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_write() - 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 * @val: 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 const struct resource gpio_resources[] = { 145 { 146 .start = TC3589x_INT_GPIIRQ, 147 .end = TC3589x_INT_GPIIRQ, 148 .flags = IORESOURCE_IRQ, 149 }, 150 }; 151 152 static const 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_find_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 { 357 const struct i2c_device_id *id = i2c_client_get_device_id(i2c); 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 void tc3589x_remove(struct i2c_client *client) 433 { 434 struct tc3589x *tc3589x = i2c_get_clientdata(client); 435 436 mfd_remove_devices(tc3589x->dev); 437 } 438 439 static int tc3589x_suspend(struct device *dev) 440 { 441 struct tc3589x *tc3589x = dev_get_drvdata(dev); 442 struct i2c_client *client = tc3589x->i2c; 443 int ret = 0; 444 445 /* put the system to sleep mode */ 446 if (!device_may_wakeup(&client->dev)) 447 ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE, 448 TC3589x_CLKMODE_MODCTL_SLEEP); 449 450 return ret; 451 } 452 453 static int tc3589x_resume(struct device *dev) 454 { 455 struct tc3589x *tc3589x = dev_get_drvdata(dev); 456 struct i2c_client *client = tc3589x->i2c; 457 int ret = 0; 458 459 /* enable the system into operation */ 460 if (!device_may_wakeup(&client->dev)) 461 ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE, 462 TC3589x_CLKMODE_MODCTL_OPERATION); 463 464 return ret; 465 } 466 467 static DEFINE_SIMPLE_DEV_PM_OPS(tc3589x_dev_pm_ops, 468 tc3589x_suspend, tc3589x_resume); 469 470 static const struct i2c_device_id tc3589x_id[] = { 471 { "tc35890", TC3589X_TC35890 }, 472 { "tc35892", TC3589X_TC35892 }, 473 { "tc35893", TC3589X_TC35893 }, 474 { "tc35894", TC3589X_TC35894 }, 475 { "tc35895", TC3589X_TC35895 }, 476 { "tc35896", TC3589X_TC35896 }, 477 { "tc3589x", TC3589X_UNKNOWN }, 478 { } 479 }; 480 MODULE_DEVICE_TABLE(i2c, tc3589x_id); 481 482 static struct i2c_driver tc3589x_driver = { 483 .driver = { 484 .name = "tc3589x", 485 .pm = pm_sleep_ptr(&tc3589x_dev_pm_ops), 486 .of_match_table = of_match_ptr(tc3589x_match), 487 }, 488 .probe = tc3589x_probe, 489 .remove = tc3589x_remove, 490 .id_table = tc3589x_id, 491 }; 492 493 static int __init tc3589x_init(void) 494 { 495 return i2c_add_driver(&tc3589x_driver); 496 } 497 subsys_initcall(tc3589x_init); 498 499 static void __exit tc3589x_exit(void) 500 { 501 i2c_del_driver(&tc3589x_driver); 502 } 503 module_exit(tc3589x_exit); 504 505 MODULE_DESCRIPTION("TC3589x MFD core driver"); 506 MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent"); 507