1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * I2C multiplexer 4 * 5 * Copyright (c) 2008-2009 Rodolfo Giometti <giometti@linux.it> 6 * Copyright (c) 2008-2009 Eurotech S.p.A. <info@eurotech.it> 7 * 8 * This module supports the PCA954x and PCA984x series of I2C multiplexer/switch 9 * chips made by NXP Semiconductors. 10 * This includes the: 11 * PCA9540, PCA9542, PCA9543, PCA9544, PCA9545, PCA9546, PCA9547, 12 * PCA9548, PCA9846, PCA9847, PCA9848 and PCA9849. 13 * 14 * It's also compatible to Maxims MAX735x I2C switch chips, which are controlled 15 * as the NXP PCA9548 and the MAX736x chips that act like the PCA9544. 16 * 17 * This includes the: 18 * MAX7356, MAX7357, MAX7358, MAX7367, MAX7368 and MAX7369 19 * 20 * These chips are all controlled via the I2C bus itself, and all have a 21 * single 8-bit register. The upstream "parent" bus fans out to two, 22 * four, or eight downstream busses or channels; which of these 23 * are selected is determined by the chip type and register contents. A 24 * mux can select only one sub-bus at a time; a switch can select any 25 * combination simultaneously. 26 * 27 * Based on: 28 * pca954x.c from Kumar Gala <galak@kernel.crashing.org> 29 * Copyright (C) 2006 30 * 31 * Based on: 32 * pca954x.c from Ken Harrenstien 33 * Copyright (C) 2004 Google, Inc. (Ken Harrenstien) 34 * 35 * Based on: 36 * i2c-virtual_cb.c from Brian Kuschak <bkuschak@yahoo.com> 37 * and 38 * pca9540.c from Jean Delvare <jdelvare@suse.de>. 39 */ 40 41 #include <linux/device.h> 42 #include <linux/delay.h> 43 #include <linux/gpio/consumer.h> 44 #include <linux/i2c.h> 45 #include <linux/i2c-mux.h> 46 #include <linux/interrupt.h> 47 #include <linux/irq.h> 48 #include <linux/module.h> 49 #include <linux/pm.h> 50 #include <linux/property.h> 51 #include <linux/regulator/consumer.h> 52 #include <linux/reset.h> 53 #include <linux/slab.h> 54 #include <linux/spinlock.h> 55 #include <dt-bindings/mux/mux.h> 56 57 #define PCA954X_MAX_NCHANS 8 58 59 #define PCA954X_IRQ_OFFSET 4 60 61 /* 62 * MAX7357's configuration register is writeable after POR, but 63 * can be locked by setting the basic mode bit. MAX7358 configuration 64 * register is locked by default and needs to be unlocked first. 65 * The configuration register holds the following settings: 66 */ 67 #define MAX7357_CONF_INT_ENABLE BIT(0) 68 #define MAX7357_CONF_FLUSH_OUT BIT(1) 69 #define MAX7357_CONF_RELEASE_INT BIT(2) 70 #define MAX7357_CONF_DISCON_SINGLE_CHAN BIT(4) 71 #define MAX7357_CONF_PRECONNECT_TEST BIT(7) 72 73 #define MAX7357_POR_DEFAULT_CONF MAX7357_CONF_INT_ENABLE 74 75 enum pca_type { 76 max_7356, 77 max_7357, 78 max_7358, 79 max_7367, 80 max_7368, 81 max_7369, 82 pca_9540, 83 pca_9542, 84 pca_9543, 85 pca_9544, 86 pca_9545, 87 pca_9546, 88 pca_9547, 89 pca_9548, 90 pca_9846, 91 pca_9847, 92 pca_9848, 93 pca_9849, 94 }; 95 96 struct chip_desc { 97 u8 nchans; 98 u8 enable; /* used for muxes only */ 99 u8 has_irq; 100 enum muxtype { 101 pca954x_ismux = 0, 102 pca954x_isswi 103 } muxtype; 104 struct i2c_device_identity id; 105 }; 106 107 struct pca954x { 108 const struct chip_desc *chip; 109 110 u8 last_chan; /* last register value */ 111 /* MUX_IDLE_AS_IS, MUX_IDLE_DISCONNECT or >= 0 for channel */ 112 s32 idle_state; 113 114 struct i2c_client *client; 115 116 struct irq_domain *irq; 117 unsigned int irq_mask; 118 raw_spinlock_t lock; 119 struct regulator *supply; 120 121 struct reset_control *reset_cont; 122 }; 123 124 /* Provide specs for the MAX735x, PCA954x and PCA984x types we know about */ 125 static const struct chip_desc chips[] = { 126 [max_7356] = { 127 .nchans = 8, 128 .muxtype = pca954x_isswi, 129 .id = { .manufacturer_id = I2C_DEVICE_ID_NONE }, 130 }, 131 [max_7357] = { 132 .nchans = 8, 133 .muxtype = pca954x_isswi, 134 .id = { .manufacturer_id = I2C_DEVICE_ID_NONE }, 135 /* 136 * No interrupt controller support. The interrupt 137 * provides information about stuck channels. 138 */ 139 }, 140 [max_7358] = { 141 .nchans = 8, 142 .muxtype = pca954x_isswi, 143 .id = { .manufacturer_id = I2C_DEVICE_ID_NONE }, 144 /* 145 * No interrupt controller support. The interrupt 146 * provides information about stuck channels. 147 */ 148 }, 149 [max_7367] = { 150 .nchans = 4, 151 .muxtype = pca954x_isswi, 152 .has_irq = 1, 153 .id = { .manufacturer_id = I2C_DEVICE_ID_NONE }, 154 }, 155 [max_7368] = { 156 .nchans = 4, 157 .muxtype = pca954x_isswi, 158 .id = { .manufacturer_id = I2C_DEVICE_ID_NONE }, 159 }, 160 [max_7369] = { 161 .nchans = 4, 162 .enable = 0x4, 163 .muxtype = pca954x_ismux, 164 .has_irq = 1, 165 .id = { .manufacturer_id = I2C_DEVICE_ID_NONE }, 166 }, 167 [pca_9540] = { 168 .nchans = 2, 169 .enable = 0x4, 170 .muxtype = pca954x_ismux, 171 .id = { .manufacturer_id = I2C_DEVICE_ID_NONE }, 172 }, 173 [pca_9542] = { 174 .nchans = 2, 175 .enable = 0x4, 176 .has_irq = 1, 177 .muxtype = pca954x_ismux, 178 .id = { .manufacturer_id = I2C_DEVICE_ID_NONE }, 179 }, 180 [pca_9543] = { 181 .nchans = 2, 182 .has_irq = 1, 183 .muxtype = pca954x_isswi, 184 .id = { .manufacturer_id = I2C_DEVICE_ID_NONE }, 185 }, 186 [pca_9544] = { 187 .nchans = 4, 188 .enable = 0x4, 189 .has_irq = 1, 190 .muxtype = pca954x_ismux, 191 .id = { .manufacturer_id = I2C_DEVICE_ID_NONE }, 192 }, 193 [pca_9545] = { 194 .nchans = 4, 195 .has_irq = 1, 196 .muxtype = pca954x_isswi, 197 .id = { .manufacturer_id = I2C_DEVICE_ID_NONE }, 198 }, 199 [pca_9546] = { 200 .nchans = 4, 201 .muxtype = pca954x_isswi, 202 .id = { .manufacturer_id = I2C_DEVICE_ID_NONE }, 203 }, 204 [pca_9547] = { 205 .nchans = 8, 206 .enable = 0x8, 207 .muxtype = pca954x_ismux, 208 .id = { .manufacturer_id = I2C_DEVICE_ID_NONE }, 209 }, 210 [pca_9548] = { 211 .nchans = 8, 212 .muxtype = pca954x_isswi, 213 .id = { .manufacturer_id = I2C_DEVICE_ID_NONE }, 214 }, 215 [pca_9846] = { 216 .nchans = 4, 217 .muxtype = pca954x_isswi, 218 .id = { 219 .manufacturer_id = I2C_DEVICE_ID_NXP_SEMICONDUCTORS, 220 .part_id = 0x10b, 221 }, 222 }, 223 [pca_9847] = { 224 .nchans = 8, 225 .enable = 0x8, 226 .muxtype = pca954x_ismux, 227 .id = { 228 .manufacturer_id = I2C_DEVICE_ID_NXP_SEMICONDUCTORS, 229 .part_id = 0x108, 230 }, 231 }, 232 [pca_9848] = { 233 .nchans = 8, 234 .muxtype = pca954x_isswi, 235 .id = { 236 .manufacturer_id = I2C_DEVICE_ID_NXP_SEMICONDUCTORS, 237 .part_id = 0x10a, 238 }, 239 }, 240 [pca_9849] = { 241 .nchans = 4, 242 .enable = 0x4, 243 .muxtype = pca954x_ismux, 244 .id = { 245 .manufacturer_id = I2C_DEVICE_ID_NXP_SEMICONDUCTORS, 246 .part_id = 0x109, 247 }, 248 }, 249 }; 250 251 static const struct i2c_device_id pca954x_id[] = { 252 { "max7356", max_7356 }, 253 { "max7357", max_7357 }, 254 { "max7358", max_7358 }, 255 { "max7367", max_7367 }, 256 { "max7368", max_7368 }, 257 { "max7369", max_7369 }, 258 { "pca9540", pca_9540 }, 259 { "pca9542", pca_9542 }, 260 { "pca9543", pca_9543 }, 261 { "pca9544", pca_9544 }, 262 { "pca9545", pca_9545 }, 263 { "pca9546", pca_9546 }, 264 { "pca9547", pca_9547 }, 265 { "pca9548", pca_9548 }, 266 { "pca9846", pca_9846 }, 267 { "pca9847", pca_9847 }, 268 { "pca9848", pca_9848 }, 269 { "pca9849", pca_9849 }, 270 { } 271 }; 272 MODULE_DEVICE_TABLE(i2c, pca954x_id); 273 274 static const struct of_device_id pca954x_of_match[] = { 275 { .compatible = "maxim,max7356", .data = &chips[max_7356] }, 276 { .compatible = "maxim,max7357", .data = &chips[max_7357] }, 277 { .compatible = "maxim,max7358", .data = &chips[max_7358] }, 278 { .compatible = "maxim,max7367", .data = &chips[max_7367] }, 279 { .compatible = "maxim,max7368", .data = &chips[max_7368] }, 280 { .compatible = "maxim,max7369", .data = &chips[max_7369] }, 281 { .compatible = "nxp,pca9540", .data = &chips[pca_9540] }, 282 { .compatible = "nxp,pca9542", .data = &chips[pca_9542] }, 283 { .compatible = "nxp,pca9543", .data = &chips[pca_9543] }, 284 { .compatible = "nxp,pca9544", .data = &chips[pca_9544] }, 285 { .compatible = "nxp,pca9545", .data = &chips[pca_9545] }, 286 { .compatible = "nxp,pca9546", .data = &chips[pca_9546] }, 287 { .compatible = "nxp,pca9547", .data = &chips[pca_9547] }, 288 { .compatible = "nxp,pca9548", .data = &chips[pca_9548] }, 289 { .compatible = "nxp,pca9846", .data = &chips[pca_9846] }, 290 { .compatible = "nxp,pca9847", .data = &chips[pca_9847] }, 291 { .compatible = "nxp,pca9848", .data = &chips[pca_9848] }, 292 { .compatible = "nxp,pca9849", .data = &chips[pca_9849] }, 293 {} 294 }; 295 MODULE_DEVICE_TABLE(of, pca954x_of_match); 296 297 /* Write to mux register. Don't use i2c_transfer()/i2c_smbus_xfer() 298 for this as they will try to lock adapter a second time */ 299 static int pca954x_reg_write(struct i2c_adapter *adap, 300 struct i2c_client *client, u8 val) 301 { 302 union i2c_smbus_data dummy; 303 304 return __i2c_smbus_xfer(adap, client->addr, client->flags, 305 I2C_SMBUS_WRITE, val, 306 I2C_SMBUS_BYTE, &dummy); 307 } 308 309 static u8 pca954x_regval(struct pca954x *data, u8 chan) 310 { 311 /* We make switches look like muxes, not sure how to be smarter. */ 312 if (data->chip->muxtype == pca954x_ismux) 313 return chan | data->chip->enable; 314 else 315 return 1 << chan; 316 } 317 318 static void pca954x_reset_assert(struct pca954x *data) 319 { 320 if (data->reset_cont) 321 reset_control_assert(data->reset_cont); 322 } 323 324 static void pca954x_reset_deassert(struct pca954x *data) 325 { 326 if (data->reset_cont) 327 reset_control_deassert(data->reset_cont); 328 } 329 330 static void pca954x_reset_mux(struct pca954x *data) 331 { 332 pca954x_reset_assert(data); 333 udelay(1); 334 pca954x_reset_deassert(data); 335 } 336 337 static int pca954x_select_chan(struct i2c_mux_core *muxc, u32 chan) 338 { 339 struct pca954x *data = i2c_mux_priv(muxc); 340 struct i2c_client *client = data->client; 341 u8 regval; 342 int ret = 0; 343 344 regval = pca954x_regval(data, chan); 345 /* Only select the channel if its different from the last channel */ 346 if (data->last_chan != regval) { 347 ret = pca954x_reg_write(muxc->parent, client, regval); 348 data->last_chan = ret < 0 ? 0 : regval; 349 } 350 if (ret == -ETIMEDOUT && data->reset_cont) 351 pca954x_reset_mux(data); 352 353 return ret; 354 } 355 356 static int pca954x_deselect_mux(struct i2c_mux_core *muxc, u32 chan) 357 { 358 struct pca954x *data = i2c_mux_priv(muxc); 359 struct i2c_client *client = data->client; 360 s32 idle_state; 361 int ret = 0; 362 363 idle_state = READ_ONCE(data->idle_state); 364 if (idle_state >= 0) 365 /* Set the mux back to a predetermined channel */ 366 return pca954x_select_chan(muxc, idle_state); 367 368 if (idle_state == MUX_IDLE_DISCONNECT) { 369 /* Deselect active channel */ 370 data->last_chan = 0; 371 ret = pca954x_reg_write(muxc->parent, client, 372 data->last_chan); 373 if (ret == -ETIMEDOUT && data->reset_cont) 374 pca954x_reset_mux(data); 375 } 376 377 /* otherwise leave as-is */ 378 379 return 0; 380 } 381 382 static ssize_t idle_state_show(struct device *dev, 383 struct device_attribute *attr, 384 char *buf) 385 { 386 struct i2c_client *client = to_i2c_client(dev); 387 struct i2c_mux_core *muxc = i2c_get_clientdata(client); 388 struct pca954x *data = i2c_mux_priv(muxc); 389 390 return sprintf(buf, "%d\n", READ_ONCE(data->idle_state)); 391 } 392 393 static ssize_t idle_state_store(struct device *dev, 394 struct device_attribute *attr, 395 const char *buf, size_t count) 396 { 397 struct i2c_client *client = to_i2c_client(dev); 398 struct i2c_mux_core *muxc = i2c_get_clientdata(client); 399 struct pca954x *data = i2c_mux_priv(muxc); 400 int val; 401 int ret; 402 403 ret = kstrtoint(buf, 0, &val); 404 if (ret < 0) 405 return ret; 406 407 if (val != MUX_IDLE_AS_IS && val != MUX_IDLE_DISCONNECT && 408 (val < 0 || val >= data->chip->nchans)) 409 return -EINVAL; 410 411 i2c_lock_bus(muxc->parent, I2C_LOCK_SEGMENT); 412 413 WRITE_ONCE(data->idle_state, val); 414 /* 415 * Set the mux into a state consistent with the new 416 * idle_state. 417 */ 418 if (data->last_chan || val != MUX_IDLE_DISCONNECT) 419 ret = pca954x_deselect_mux(muxc, 0); 420 421 i2c_unlock_bus(muxc->parent, I2C_LOCK_SEGMENT); 422 423 return ret < 0 ? ret : count; 424 } 425 426 static DEVICE_ATTR_RW(idle_state); 427 428 static irqreturn_t pca954x_irq_handler(int irq, void *dev_id) 429 { 430 struct pca954x *data = dev_id; 431 unsigned long pending; 432 int ret, i; 433 434 ret = i2c_smbus_read_byte(data->client); 435 if (ret < 0) 436 return IRQ_NONE; 437 438 pending = (ret >> PCA954X_IRQ_OFFSET) & (BIT(data->chip->nchans) - 1); 439 for_each_set_bit(i, &pending, data->chip->nchans) 440 handle_nested_irq(irq_find_mapping(data->irq, i)); 441 442 return IRQ_RETVAL(pending); 443 } 444 445 static int pca954x_irq_set_type(struct irq_data *idata, unsigned int type) 446 { 447 if ((type & IRQ_TYPE_SENSE_MASK) != IRQ_TYPE_LEVEL_LOW) 448 return -EINVAL; 449 return 0; 450 } 451 452 static struct irq_chip pca954x_irq_chip = { 453 .name = "i2c-mux-pca954x", 454 .irq_set_type = pca954x_irq_set_type, 455 }; 456 457 static int pca954x_irq_setup(struct i2c_mux_core *muxc) 458 { 459 struct pca954x *data = i2c_mux_priv(muxc); 460 struct i2c_client *client = data->client; 461 int c, irq; 462 463 if (!data->chip->has_irq || client->irq <= 0) 464 return 0; 465 466 raw_spin_lock_init(&data->lock); 467 468 data->irq = irq_domain_create_linear(dev_fwnode(&client->dev), data->chip->nchans, 469 &irq_domain_simple_ops, data); 470 if (!data->irq) 471 return -ENODEV; 472 473 for (c = 0; c < data->chip->nchans; c++) { 474 irq = irq_create_mapping(data->irq, c); 475 if (!irq) { 476 dev_err(&client->dev, "failed irq create map\n"); 477 return -EINVAL; 478 } 479 irq_set_chip_data(irq, data); 480 irq_set_chip_and_handler(irq, &pca954x_irq_chip, 481 handle_simple_irq); 482 } 483 484 return 0; 485 } 486 487 static void pca954x_cleanup(struct i2c_mux_core *muxc) 488 { 489 struct pca954x *data = i2c_mux_priv(muxc); 490 int c, irq; 491 492 regulator_disable(data->supply); 493 494 if (data->irq) { 495 for (c = 0; c < data->chip->nchans; c++) { 496 irq = irq_find_mapping(data->irq, c); 497 irq_dispose_mapping(irq); 498 } 499 irq_domain_remove(data->irq); 500 } 501 i2c_mux_del_adapters(muxc); 502 } 503 504 static int pca954x_init(struct i2c_client *client, struct pca954x *data) 505 { 506 int ret; 507 508 if (data->idle_state >= 0) 509 data->last_chan = pca954x_regval(data, data->idle_state); 510 else 511 data->last_chan = 0; /* Disconnect multiplexer */ 512 513 if (device_is_compatible(&client->dev, "maxim,max7357")) { 514 if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) { 515 u8 conf = MAX7357_POR_DEFAULT_CONF; 516 /* 517 * The interrupt signal is shared with the reset pin. Release the 518 * interrupt after 1.6 seconds to allow using the pin as reset. 519 */ 520 conf |= MAX7357_CONF_RELEASE_INT; 521 522 if (device_property_read_bool(&client->dev, "maxim,isolate-stuck-channel")) 523 conf |= MAX7357_CONF_DISCON_SINGLE_CHAN; 524 if (device_property_read_bool(&client->dev, 525 "maxim,send-flush-out-sequence")) 526 conf |= MAX7357_CONF_FLUSH_OUT; 527 if (device_property_read_bool(&client->dev, 528 "maxim,preconnection-wiggle-test-enable")) 529 conf |= MAX7357_CONF_PRECONNECT_TEST; 530 531 ret = i2c_smbus_write_byte_data(client, data->last_chan, conf); 532 } else { 533 dev_warn(&client->dev, "Write byte data not supported." 534 "Cannot enable enhanced mode features\n"); 535 ret = i2c_smbus_write_byte(client, data->last_chan); 536 } 537 } else { 538 ret = i2c_smbus_write_byte(client, data->last_chan); 539 } 540 541 if (ret < 0) 542 data->last_chan = 0; 543 544 return ret; 545 } 546 547 static int pca954x_get_reset(struct device *dev, struct pca954x *data) 548 { 549 data->reset_cont = devm_reset_control_get_optional_shared(dev, NULL); 550 if (IS_ERR(data->reset_cont)) 551 return dev_err_probe(dev, PTR_ERR(data->reset_cont), 552 "Failed to get reset\n"); 553 554 return 0; 555 } 556 557 /* 558 * I2C init/probing/exit functions 559 */ 560 static int pca954x_probe(struct i2c_client *client) 561 { 562 const struct i2c_device_id *id = i2c_client_get_device_id(client); 563 struct i2c_adapter *adap = client->adapter; 564 struct device *dev = &client->dev; 565 struct i2c_mux_core *muxc; 566 struct pca954x *data; 567 int num; 568 int ret; 569 570 if (!i2c_check_functionality(adap, I2C_FUNC_SMBUS_BYTE)) 571 return -ENODEV; 572 573 muxc = i2c_mux_alloc(adap, dev, PCA954X_MAX_NCHANS, sizeof(*data), 0, 574 pca954x_select_chan, pca954x_deselect_mux); 575 if (!muxc) 576 return -ENOMEM; 577 data = i2c_mux_priv(muxc); 578 579 i2c_set_clientdata(client, muxc); 580 data->client = client; 581 582 data->supply = devm_regulator_get(dev, "vdd"); 583 if (IS_ERR(data->supply)) 584 return dev_err_probe(dev, PTR_ERR(data->supply), 585 "Failed to request regulator\n"); 586 587 ret = regulator_enable(data->supply); 588 if (ret) 589 return dev_err_probe(dev, ret, 590 "Failed to enable vdd supply\n"); 591 592 ret = pca954x_get_reset(dev, data); 593 if (ret) 594 goto fail_cleanup; 595 596 if (data->reset_cont) { 597 udelay(1); 598 pca954x_reset_deassert(data); 599 /* Give the chip some time to recover. */ 600 udelay(1); 601 } 602 603 data->chip = device_get_match_data(dev); 604 if (!data->chip) 605 data->chip = &chips[id->driver_data]; 606 607 if (data->chip->id.manufacturer_id != I2C_DEVICE_ID_NONE) { 608 struct i2c_device_identity id; 609 610 ret = i2c_get_device_id(client, &id); 611 if (ret && ret != -EOPNOTSUPP) 612 goto fail_cleanup; 613 614 if (!ret && 615 (id.manufacturer_id != data->chip->id.manufacturer_id || 616 id.part_id != data->chip->id.part_id)) { 617 dev_warn(dev, "unexpected device id %03x-%03x-%x\n", 618 id.manufacturer_id, id.part_id, 619 id.die_revision); 620 ret = -ENODEV; 621 goto fail_cleanup; 622 } 623 } 624 625 data->idle_state = MUX_IDLE_AS_IS; 626 if (device_property_read_u32(dev, "idle-state", &data->idle_state)) { 627 if (device_property_read_bool(dev, "i2c-mux-idle-disconnect")) 628 data->idle_state = MUX_IDLE_DISCONNECT; 629 } 630 631 /* 632 * Write the mux register at addr to verify 633 * that the mux is in fact present. This also 634 * initializes the mux to a channel 635 * or disconnected state. 636 */ 637 ret = pca954x_init(client, data); 638 if (ret < 0) { 639 dev_warn(dev, "probe failed\n"); 640 ret = -ENODEV; 641 goto fail_cleanup; 642 } 643 644 ret = pca954x_irq_setup(muxc); 645 if (ret) 646 goto fail_cleanup; 647 648 /* Now create an adapter for each channel */ 649 for (num = 0; num < data->chip->nchans; num++) { 650 ret = i2c_mux_add_adapter(muxc, 0, num); 651 if (ret) 652 goto fail_cleanup; 653 } 654 655 if (data->irq) { 656 ret = devm_request_threaded_irq(dev, data->client->irq, 657 NULL, pca954x_irq_handler, 658 IRQF_ONESHOT | IRQF_SHARED, 659 "pca954x", data); 660 if (ret) 661 goto fail_cleanup; 662 } 663 664 /* 665 * The attr probably isn't going to be needed in most cases, 666 * so don't fail completely on error. 667 */ 668 device_create_file(dev, &dev_attr_idle_state); 669 670 dev_info(dev, "registered %d multiplexed busses for I2C %s %s\n", 671 num, data->chip->muxtype == pca954x_ismux 672 ? "mux" : "switch", client->name); 673 674 return 0; 675 676 fail_cleanup: 677 pca954x_cleanup(muxc); 678 return ret; 679 } 680 681 static void pca954x_remove(struct i2c_client *client) 682 { 683 struct i2c_mux_core *muxc = i2c_get_clientdata(client); 684 685 device_remove_file(&client->dev, &dev_attr_idle_state); 686 687 pca954x_cleanup(muxc); 688 } 689 690 static int pca954x_resume(struct device *dev) 691 { 692 struct i2c_client *client = to_i2c_client(dev); 693 struct i2c_mux_core *muxc = i2c_get_clientdata(client); 694 struct pca954x *data = i2c_mux_priv(muxc); 695 int ret; 696 697 ret = pca954x_init(client, data); 698 if (ret < 0) 699 dev_err(&client->dev, "failed to verify mux presence\n"); 700 701 return ret; 702 } 703 704 static DEFINE_SIMPLE_DEV_PM_OPS(pca954x_pm, NULL, pca954x_resume); 705 706 static struct i2c_driver pca954x_driver = { 707 .driver = { 708 .name = "pca954x", 709 .pm = pm_sleep_ptr(&pca954x_pm), 710 .of_match_table = pca954x_of_match, 711 }, 712 .probe = pca954x_probe, 713 .remove = pca954x_remove, 714 .id_table = pca954x_id, 715 }; 716 717 module_i2c_driver(pca954x_driver); 718 719 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>"); 720 MODULE_DESCRIPTION("PCA954x I2C mux/switch driver"); 721 MODULE_LICENSE("GPL v2"); 722