1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Freescale MMA9551L Intelligent Motion-Sensing Platform driver 4 * Copyright (c) 2014, Intel Corporation. 5 */ 6 7 #include <linux/module.h> 8 #include <linux/i2c.h> 9 #include <linux/interrupt.h> 10 #include <linux/slab.h> 11 #include <linux/acpi.h> 12 #include <linux/delay.h> 13 #include <linux/gpio/consumer.h> 14 #include <linux/iio/iio.h> 15 #include <linux/iio/sysfs.h> 16 #include <linux/iio/events.h> 17 #include <linux/pm_runtime.h> 18 #include "mma9551_core.h" 19 20 #define MMA9551_DRV_NAME "mma9551" 21 #define MMA9551_IRQ_NAME "mma9551_event" 22 #define MMA9551_GPIO_COUNT 4 23 24 /* Tilt application (inclination in IIO terms). */ 25 #define MMA9551_TILT_XZ_ANG_REG 0x00 26 #define MMA9551_TILT_YZ_ANG_REG 0x01 27 #define MMA9551_TILT_XY_ANG_REG 0x02 28 #define MMA9551_TILT_ANGFLG BIT(7) 29 #define MMA9551_TILT_QUAD_REG 0x03 30 #define MMA9551_TILT_XY_QUAD_SHIFT 0 31 #define MMA9551_TILT_YZ_QUAD_SHIFT 2 32 #define MMA9551_TILT_XZ_QUAD_SHIFT 4 33 #define MMA9551_TILT_CFG_REG 0x01 34 #define MMA9551_TILT_ANG_THRESH_MASK GENMASK(3, 0) 35 36 #define MMA9551_DEFAULT_SAMPLE_RATE 122 /* Hz */ 37 38 /* Tilt events are mapped to the first three GPIO pins. */ 39 enum mma9551_tilt_axis { 40 mma9551_x = 0, 41 mma9551_y, 42 mma9551_z, 43 }; 44 45 struct mma9551_data { 46 struct i2c_client *client; 47 struct mutex mutex; 48 int event_enabled[3]; 49 int irqs[MMA9551_GPIO_COUNT]; 50 }; 51 52 static int mma9551_read_incli_chan(struct i2c_client *client, 53 const struct iio_chan_spec *chan, 54 int *val) 55 { 56 u8 quad_shift, angle, quadrant; 57 u16 reg_addr; 58 int ret; 59 60 switch (chan->channel2) { 61 case IIO_MOD_X: 62 reg_addr = MMA9551_TILT_YZ_ANG_REG; 63 quad_shift = MMA9551_TILT_YZ_QUAD_SHIFT; 64 break; 65 case IIO_MOD_Y: 66 reg_addr = MMA9551_TILT_XZ_ANG_REG; 67 quad_shift = MMA9551_TILT_XZ_QUAD_SHIFT; 68 break; 69 case IIO_MOD_Z: 70 reg_addr = MMA9551_TILT_XY_ANG_REG; 71 quad_shift = MMA9551_TILT_XY_QUAD_SHIFT; 72 break; 73 default: 74 return -EINVAL; 75 } 76 77 ret = mma9551_set_power_state(client, true); 78 if (ret < 0) 79 return ret; 80 81 ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT, 82 reg_addr, &angle); 83 if (ret < 0) 84 goto out_poweroff; 85 86 ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT, 87 MMA9551_TILT_QUAD_REG, &quadrant); 88 if (ret < 0) 89 goto out_poweroff; 90 91 angle &= ~MMA9551_TILT_ANGFLG; 92 quadrant = (quadrant >> quad_shift) & 0x03; 93 94 if (quadrant == 1 || quadrant == 3) 95 *val = 90 * (quadrant + 1) - angle; 96 else 97 *val = angle + 90 * quadrant; 98 99 ret = IIO_VAL_INT; 100 101 out_poweroff: 102 mma9551_set_power_state(client, false); 103 return ret; 104 } 105 106 static int mma9551_read_raw(struct iio_dev *indio_dev, 107 struct iio_chan_spec const *chan, 108 int *val, int *val2, long mask) 109 { 110 struct mma9551_data *data = iio_priv(indio_dev); 111 int ret; 112 113 switch (mask) { 114 case IIO_CHAN_INFO_PROCESSED: 115 switch (chan->type) { 116 case IIO_INCLI: 117 mutex_lock(&data->mutex); 118 ret = mma9551_read_incli_chan(data->client, chan, val); 119 mutex_unlock(&data->mutex); 120 return ret; 121 default: 122 return -EINVAL; 123 } 124 case IIO_CHAN_INFO_RAW: 125 switch (chan->type) { 126 case IIO_ACCEL: 127 mutex_lock(&data->mutex); 128 ret = mma9551_read_accel_chan(data->client, 129 chan, val, val2); 130 mutex_unlock(&data->mutex); 131 return ret; 132 default: 133 return -EINVAL; 134 } 135 case IIO_CHAN_INFO_SCALE: 136 switch (chan->type) { 137 case IIO_ACCEL: 138 return mma9551_read_accel_scale(val, val2); 139 default: 140 return -EINVAL; 141 } 142 default: 143 return -EINVAL; 144 } 145 } 146 147 static int mma9551_read_event_config(struct iio_dev *indio_dev, 148 const struct iio_chan_spec *chan, 149 enum iio_event_type type, 150 enum iio_event_direction dir) 151 { 152 struct mma9551_data *data = iio_priv(indio_dev); 153 154 switch (chan->type) { 155 case IIO_INCLI: 156 /* IIO counts axes from 1, because IIO_NO_MOD is 0. */ 157 return data->event_enabled[chan->channel2 - 1]; 158 default: 159 return -EINVAL; 160 } 161 } 162 163 static int mma9551_config_incli_event(struct iio_dev *indio_dev, 164 enum iio_modifier axis, 165 int state) 166 { 167 struct mma9551_data *data = iio_priv(indio_dev); 168 enum mma9551_tilt_axis mma_axis; 169 int ret; 170 171 /* IIO counts axes from 1, because IIO_NO_MOD is 0. */ 172 mma_axis = axis - 1; 173 174 if (data->event_enabled[mma_axis] == state) 175 return 0; 176 177 if (state == 0) { 178 ret = mma9551_gpio_config(data->client, 179 (enum mma9551_gpio_pin)mma_axis, 180 MMA9551_APPID_NONE, 0, 0); 181 if (ret < 0) 182 return ret; 183 184 ret = mma9551_set_power_state(data->client, false); 185 if (ret < 0) 186 return ret; 187 } else { 188 int bitnum; 189 190 /* Bit 7 of each angle register holds the angle flag. */ 191 switch (axis) { 192 case IIO_MOD_X: 193 bitnum = 7 + 8 * MMA9551_TILT_YZ_ANG_REG; 194 break; 195 case IIO_MOD_Y: 196 bitnum = 7 + 8 * MMA9551_TILT_XZ_ANG_REG; 197 break; 198 case IIO_MOD_Z: 199 bitnum = 7 + 8 * MMA9551_TILT_XY_ANG_REG; 200 break; 201 default: 202 return -EINVAL; 203 } 204 205 206 ret = mma9551_set_power_state(data->client, true); 207 if (ret < 0) 208 return ret; 209 210 ret = mma9551_gpio_config(data->client, 211 (enum mma9551_gpio_pin)mma_axis, 212 MMA9551_APPID_TILT, bitnum, 0); 213 if (ret < 0) { 214 mma9551_set_power_state(data->client, false); 215 return ret; 216 } 217 } 218 219 data->event_enabled[mma_axis] = state; 220 221 return ret; 222 } 223 224 static int mma9551_write_event_config(struct iio_dev *indio_dev, 225 const struct iio_chan_spec *chan, 226 enum iio_event_type type, 227 enum iio_event_direction dir, 228 int state) 229 { 230 struct mma9551_data *data = iio_priv(indio_dev); 231 int ret; 232 233 switch (chan->type) { 234 case IIO_INCLI: 235 mutex_lock(&data->mutex); 236 ret = mma9551_config_incli_event(indio_dev, 237 chan->channel2, state); 238 mutex_unlock(&data->mutex); 239 return ret; 240 default: 241 return -EINVAL; 242 } 243 } 244 245 static int mma9551_write_event_value(struct iio_dev *indio_dev, 246 const struct iio_chan_spec *chan, 247 enum iio_event_type type, 248 enum iio_event_direction dir, 249 enum iio_event_info info, 250 int val, int val2) 251 { 252 struct mma9551_data *data = iio_priv(indio_dev); 253 int ret; 254 255 switch (chan->type) { 256 case IIO_INCLI: 257 if (val2 != 0 || val < 1 || val > 10) 258 return -EINVAL; 259 mutex_lock(&data->mutex); 260 ret = mma9551_update_config_bits(data->client, 261 MMA9551_APPID_TILT, 262 MMA9551_TILT_CFG_REG, 263 MMA9551_TILT_ANG_THRESH_MASK, 264 val); 265 mutex_unlock(&data->mutex); 266 return ret; 267 default: 268 return -EINVAL; 269 } 270 } 271 272 static int mma9551_read_event_value(struct iio_dev *indio_dev, 273 const struct iio_chan_spec *chan, 274 enum iio_event_type type, 275 enum iio_event_direction dir, 276 enum iio_event_info info, 277 int *val, int *val2) 278 { 279 struct mma9551_data *data = iio_priv(indio_dev); 280 int ret; 281 u8 tmp; 282 283 switch (chan->type) { 284 case IIO_INCLI: 285 mutex_lock(&data->mutex); 286 ret = mma9551_read_config_byte(data->client, 287 MMA9551_APPID_TILT, 288 MMA9551_TILT_CFG_REG, &tmp); 289 mutex_unlock(&data->mutex); 290 if (ret < 0) 291 return ret; 292 *val = tmp & MMA9551_TILT_ANG_THRESH_MASK; 293 *val2 = 0; 294 return IIO_VAL_INT; 295 default: 296 return -EINVAL; 297 } 298 } 299 300 static const struct iio_event_spec mma9551_incli_event = { 301 .type = IIO_EV_TYPE_ROC, 302 .dir = IIO_EV_DIR_RISING, 303 .mask_separate = BIT(IIO_EV_INFO_ENABLE), 304 .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE), 305 }; 306 307 #define MMA9551_INCLI_CHANNEL(axis) { \ 308 .type = IIO_INCLI, \ 309 .modified = 1, \ 310 .channel2 = axis, \ 311 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \ 312 .event_spec = &mma9551_incli_event, \ 313 .num_event_specs = 1, \ 314 } 315 316 static const struct iio_chan_spec mma9551_channels[] = { 317 MMA9551_ACCEL_CHANNEL(IIO_MOD_X), 318 MMA9551_ACCEL_CHANNEL(IIO_MOD_Y), 319 MMA9551_ACCEL_CHANNEL(IIO_MOD_Z), 320 321 MMA9551_INCLI_CHANNEL(IIO_MOD_X), 322 MMA9551_INCLI_CHANNEL(IIO_MOD_Y), 323 MMA9551_INCLI_CHANNEL(IIO_MOD_Z), 324 }; 325 326 static const struct iio_info mma9551_info = { 327 .read_raw = mma9551_read_raw, 328 .read_event_config = mma9551_read_event_config, 329 .write_event_config = mma9551_write_event_config, 330 .read_event_value = mma9551_read_event_value, 331 .write_event_value = mma9551_write_event_value, 332 }; 333 334 static irqreturn_t mma9551_event_handler(int irq, void *private) 335 { 336 struct iio_dev *indio_dev = private; 337 struct mma9551_data *data = iio_priv(indio_dev); 338 int i, ret, mma_axis = -1; 339 u16 reg; 340 u8 val; 341 342 mutex_lock(&data->mutex); 343 344 for (i = 0; i < 3; i++) 345 if (irq == data->irqs[i]) { 346 mma_axis = i; 347 break; 348 } 349 350 if (mma_axis == -1) { 351 /* IRQ was triggered on 4th line, which we don't use. */ 352 dev_warn(&data->client->dev, 353 "irq triggered on unused line %d\n", data->irqs[3]); 354 goto out; 355 } 356 357 switch (mma_axis) { 358 case mma9551_x: 359 reg = MMA9551_TILT_YZ_ANG_REG; 360 break; 361 case mma9551_y: 362 reg = MMA9551_TILT_XZ_ANG_REG; 363 break; 364 case mma9551_z: 365 reg = MMA9551_TILT_XY_ANG_REG; 366 break; 367 } 368 369 /* 370 * Read the angle even though we don't use it, otherwise we 371 * won't get any further interrupts. 372 */ 373 ret = mma9551_read_status_byte(data->client, MMA9551_APPID_TILT, 374 reg, &val); 375 if (ret < 0) { 376 dev_err(&data->client->dev, 377 "error %d reading tilt register in IRQ\n", ret); 378 goto out; 379 } 380 381 iio_push_event(indio_dev, 382 IIO_MOD_EVENT_CODE(IIO_INCLI, 0, (mma_axis + 1), 383 IIO_EV_TYPE_ROC, IIO_EV_DIR_RISING), 384 iio_get_time_ns(indio_dev)); 385 386 out: 387 mutex_unlock(&data->mutex); 388 389 return IRQ_HANDLED; 390 } 391 392 static int mma9551_init(struct mma9551_data *data) 393 { 394 int ret; 395 396 ret = mma9551_read_version(data->client); 397 if (ret) 398 return ret; 399 400 return mma9551_set_device_state(data->client, true); 401 } 402 403 static int mma9551_gpio_probe(struct iio_dev *indio_dev) 404 { 405 struct gpio_desc *gpio; 406 int i, ret; 407 struct mma9551_data *data = iio_priv(indio_dev); 408 struct device *dev = &data->client->dev; 409 410 for (i = 0; i < MMA9551_GPIO_COUNT; i++) { 411 gpio = devm_gpiod_get_index(dev, NULL, i, GPIOD_IN); 412 if (IS_ERR(gpio)) { 413 dev_err(dev, "acpi gpio get index failed\n"); 414 return PTR_ERR(gpio); 415 } 416 417 ret = gpiod_to_irq(gpio); 418 if (ret < 0) 419 return ret; 420 421 data->irqs[i] = ret; 422 ret = devm_request_threaded_irq(dev, data->irqs[i], 423 NULL, mma9551_event_handler, 424 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 425 MMA9551_IRQ_NAME, indio_dev); 426 if (ret < 0) { 427 dev_err(dev, "request irq %d failed\n", data->irqs[i]); 428 return ret; 429 } 430 431 dev_dbg(dev, "gpio resource, no:%d irq:%d\n", 432 desc_to_gpio(gpio), data->irqs[i]); 433 } 434 435 return 0; 436 } 437 438 static const char *mma9551_match_acpi_device(struct device *dev) 439 { 440 const struct acpi_device_id *id; 441 442 id = acpi_match_device(dev->driver->acpi_match_table, dev); 443 if (!id) 444 return NULL; 445 446 return dev_name(dev); 447 } 448 449 static int mma9551_probe(struct i2c_client *client, 450 const struct i2c_device_id *id) 451 { 452 struct mma9551_data *data; 453 struct iio_dev *indio_dev; 454 const char *name = NULL; 455 int ret; 456 457 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); 458 if (!indio_dev) 459 return -ENOMEM; 460 461 data = iio_priv(indio_dev); 462 i2c_set_clientdata(client, indio_dev); 463 data->client = client; 464 465 if (id) 466 name = id->name; 467 else if (ACPI_HANDLE(&client->dev)) 468 name = mma9551_match_acpi_device(&client->dev); 469 470 ret = mma9551_init(data); 471 if (ret < 0) 472 return ret; 473 474 mutex_init(&data->mutex); 475 476 indio_dev->channels = mma9551_channels; 477 indio_dev->num_channels = ARRAY_SIZE(mma9551_channels); 478 indio_dev->name = name; 479 indio_dev->modes = INDIO_DIRECT_MODE; 480 indio_dev->info = &mma9551_info; 481 482 ret = mma9551_gpio_probe(indio_dev); 483 if (ret < 0) 484 goto out_poweroff; 485 486 ret = pm_runtime_set_active(&client->dev); 487 if (ret < 0) 488 goto out_poweroff; 489 490 pm_runtime_enable(&client->dev); 491 pm_runtime_set_autosuspend_delay(&client->dev, 492 MMA9551_AUTO_SUSPEND_DELAY_MS); 493 pm_runtime_use_autosuspend(&client->dev); 494 495 ret = iio_device_register(indio_dev); 496 if (ret < 0) { 497 dev_err(&client->dev, "unable to register iio device\n"); 498 goto err_pm_cleanup; 499 } 500 501 return 0; 502 503 err_pm_cleanup: 504 pm_runtime_dont_use_autosuspend(&client->dev); 505 pm_runtime_disable(&client->dev); 506 out_poweroff: 507 mma9551_set_device_state(client, false); 508 509 return ret; 510 } 511 512 static void mma9551_remove(struct i2c_client *client) 513 { 514 struct iio_dev *indio_dev = i2c_get_clientdata(client); 515 struct mma9551_data *data = iio_priv(indio_dev); 516 517 iio_device_unregister(indio_dev); 518 519 pm_runtime_disable(&client->dev); 520 pm_runtime_set_suspended(&client->dev); 521 522 mutex_lock(&data->mutex); 523 mma9551_set_device_state(data->client, false); 524 mutex_unlock(&data->mutex); 525 } 526 527 static int mma9551_runtime_suspend(struct device *dev) 528 { 529 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 530 struct mma9551_data *data = iio_priv(indio_dev); 531 int ret; 532 533 mutex_lock(&data->mutex); 534 ret = mma9551_set_device_state(data->client, false); 535 mutex_unlock(&data->mutex); 536 if (ret < 0) { 537 dev_err(&data->client->dev, "powering off device failed\n"); 538 return -EAGAIN; 539 } 540 541 return 0; 542 } 543 544 static int mma9551_runtime_resume(struct device *dev) 545 { 546 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 547 struct mma9551_data *data = iio_priv(indio_dev); 548 int ret; 549 550 ret = mma9551_set_device_state(data->client, true); 551 if (ret < 0) 552 return ret; 553 554 mma9551_sleep(MMA9551_DEFAULT_SAMPLE_RATE); 555 556 return 0; 557 } 558 559 static int mma9551_suspend(struct device *dev) 560 { 561 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 562 struct mma9551_data *data = iio_priv(indio_dev); 563 int ret; 564 565 mutex_lock(&data->mutex); 566 ret = mma9551_set_device_state(data->client, false); 567 mutex_unlock(&data->mutex); 568 569 return ret; 570 } 571 572 static int mma9551_resume(struct device *dev) 573 { 574 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 575 struct mma9551_data *data = iio_priv(indio_dev); 576 int ret; 577 578 mutex_lock(&data->mutex); 579 ret = mma9551_set_device_state(data->client, true); 580 mutex_unlock(&data->mutex); 581 582 return ret; 583 } 584 585 static const struct dev_pm_ops mma9551_pm_ops = { 586 SYSTEM_SLEEP_PM_OPS(mma9551_suspend, mma9551_resume) 587 RUNTIME_PM_OPS(mma9551_runtime_suspend, mma9551_runtime_resume, NULL) 588 }; 589 590 static const struct acpi_device_id mma9551_acpi_match[] = { 591 {"MMA9551", 0}, 592 {}, 593 }; 594 595 MODULE_DEVICE_TABLE(acpi, mma9551_acpi_match); 596 597 static const struct i2c_device_id mma9551_id[] = { 598 {"mma9551", 0}, 599 {} 600 }; 601 602 MODULE_DEVICE_TABLE(i2c, mma9551_id); 603 604 static struct i2c_driver mma9551_driver = { 605 .driver = { 606 .name = MMA9551_DRV_NAME, 607 .acpi_match_table = ACPI_PTR(mma9551_acpi_match), 608 .pm = pm_ptr(&mma9551_pm_ops), 609 }, 610 .probe = mma9551_probe, 611 .remove = mma9551_remove, 612 .id_table = mma9551_id, 613 }; 614 615 module_i2c_driver(mma9551_driver); 616 617 MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>"); 618 MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>"); 619 MODULE_LICENSE("GPL v2"); 620 MODULE_DESCRIPTION("MMA9551L motion-sensing platform driver"); 621 MODULE_IMPORT_NS(IIO_MMA9551); 622