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 { .compatible = "toshiba,tc35890", .data = (void *) TC3589X_TC35890 }, 316 { .compatible = "toshiba,tc35892", .data = (void *) TC3589X_TC35892 }, 317 { .compatible = "toshiba,tc35893", .data = (void *) TC3589X_TC35893 }, 318 { .compatible = "toshiba,tc35894", .data = (void *) TC3589X_TC35894 }, 319 { .compatible = "toshiba,tc35895", .data = (void *) TC3589X_TC35895 }, 320 { .compatible = "toshiba,tc35896", .data = (void *) TC3589X_TC35896 }, 321 { } 322 }; 323 324 MODULE_DEVICE_TABLE(of, tc3589x_match); 325 326 static struct tc3589x_platform_data * 327 tc3589x_of_probe(struct device *dev, enum tc3589x_version *version) 328 { 329 struct device_node *np = dev->of_node; 330 struct tc3589x_platform_data *pdata; 331 struct device_node *child; 332 const struct of_device_id *of_id; 333 334 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 335 if (!pdata) 336 return ERR_PTR(-ENOMEM); 337 338 of_id = of_match_device(tc3589x_match, dev); 339 if (!of_id) 340 return ERR_PTR(-ENODEV); 341 *version = (uintptr_t) of_id->data; 342 343 for_each_child_of_node(np, child) { 344 if (of_device_is_compatible(child, "toshiba,tc3589x-gpio")) 345 pdata->block |= TC3589x_BLOCK_GPIO; 346 if (of_device_is_compatible(child, "toshiba,tc3589x-keypad")) 347 pdata->block |= TC3589x_BLOCK_KEYPAD; 348 } 349 350 return pdata; 351 } 352 353 static int tc3589x_probe(struct i2c_client *i2c) 354 { 355 const struct i2c_device_id *id = i2c_client_get_device_id(i2c); 356 struct device_node *np = i2c->dev.of_node; 357 struct tc3589x_platform_data *pdata = dev_get_platdata(&i2c->dev); 358 struct tc3589x *tc3589x; 359 enum tc3589x_version version; 360 int ret; 361 362 if (!pdata) { 363 pdata = tc3589x_of_probe(&i2c->dev, &version); 364 if (IS_ERR(pdata)) { 365 dev_err(&i2c->dev, "No platform data or DT found\n"); 366 return PTR_ERR(pdata); 367 } 368 } else { 369 /* When not probing from device tree we have this ID */ 370 version = id->driver_data; 371 } 372 373 if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA 374 | I2C_FUNC_SMBUS_I2C_BLOCK)) 375 return -EIO; 376 377 tc3589x = devm_kzalloc(&i2c->dev, sizeof(struct tc3589x), 378 GFP_KERNEL); 379 if (!tc3589x) 380 return -ENOMEM; 381 382 mutex_init(&tc3589x->lock); 383 384 tc3589x->dev = &i2c->dev; 385 tc3589x->i2c = i2c; 386 tc3589x->pdata = pdata; 387 388 switch (version) { 389 case TC3589X_TC35893: 390 case TC3589X_TC35895: 391 case TC3589X_TC35896: 392 tc3589x->num_gpio = 20; 393 break; 394 case TC3589X_TC35890: 395 case TC3589X_TC35892: 396 case TC3589X_TC35894: 397 case TC3589X_UNKNOWN: 398 default: 399 tc3589x->num_gpio = 24; 400 break; 401 } 402 403 i2c_set_clientdata(i2c, tc3589x); 404 405 ret = tc3589x_chip_init(tc3589x); 406 if (ret) 407 return ret; 408 409 ret = tc3589x_irq_init(tc3589x, np); 410 if (ret) 411 return ret; 412 413 ret = request_threaded_irq(tc3589x->i2c->irq, NULL, tc3589x_irq, 414 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 415 "tc3589x", tc3589x); 416 if (ret) { 417 dev_err(tc3589x->dev, "failed to request IRQ: %d\n", ret); 418 return ret; 419 } 420 421 ret = tc3589x_device_init(tc3589x); 422 if (ret) { 423 dev_err(tc3589x->dev, "failed to add child devices\n"); 424 return ret; 425 } 426 427 return 0; 428 } 429 430 static void tc3589x_remove(struct i2c_client *client) 431 { 432 struct tc3589x *tc3589x = i2c_get_clientdata(client); 433 434 mfd_remove_devices(tc3589x->dev); 435 } 436 437 static int tc3589x_suspend(struct device *dev) 438 { 439 struct tc3589x *tc3589x = dev_get_drvdata(dev); 440 struct i2c_client *client = tc3589x->i2c; 441 int ret = 0; 442 443 /* put the system to sleep mode */ 444 if (!device_may_wakeup(&client->dev)) 445 ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE, 446 TC3589x_CLKMODE_MODCTL_SLEEP); 447 448 return ret; 449 } 450 451 static int tc3589x_resume(struct device *dev) 452 { 453 struct tc3589x *tc3589x = dev_get_drvdata(dev); 454 struct i2c_client *client = tc3589x->i2c; 455 int ret = 0; 456 457 /* enable the system into operation */ 458 if (!device_may_wakeup(&client->dev)) 459 ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE, 460 TC3589x_CLKMODE_MODCTL_OPERATION); 461 462 return ret; 463 } 464 465 static DEFINE_SIMPLE_DEV_PM_OPS(tc3589x_dev_pm_ops, 466 tc3589x_suspend, tc3589x_resume); 467 468 static const struct i2c_device_id tc3589x_id[] = { 469 { "tc35890", TC3589X_TC35890 }, 470 { "tc35892", TC3589X_TC35892 }, 471 { "tc35893", TC3589X_TC35893 }, 472 { "tc35894", TC3589X_TC35894 }, 473 { "tc35895", TC3589X_TC35895 }, 474 { "tc35896", TC3589X_TC35896 }, 475 { "tc3589x", TC3589X_UNKNOWN }, 476 { } 477 }; 478 MODULE_DEVICE_TABLE(i2c, tc3589x_id); 479 480 static struct i2c_driver tc3589x_driver = { 481 .driver = { 482 .name = "tc3589x", 483 .pm = pm_sleep_ptr(&tc3589x_dev_pm_ops), 484 .of_match_table = tc3589x_match, 485 }, 486 .probe = tc3589x_probe, 487 .remove = tc3589x_remove, 488 .id_table = tc3589x_id, 489 }; 490 491 static int __init tc3589x_init(void) 492 { 493 return i2c_add_driver(&tc3589x_driver); 494 } 495 subsys_initcall(tc3589x_init); 496 497 static void __exit tc3589x_exit(void) 498 { 499 i2c_del_driver(&tc3589x_driver); 500 } 501 module_exit(tc3589x_exit); 502 503 MODULE_DESCRIPTION("TC3589x MFD core driver"); 504 MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent"); 505