1 /* 2 * Copyright (c) 2011 Bosch Sensortec GmbH 3 * Copyright (c) 2011 Unixphere 4 * 5 * This driver adds support for Bosch Sensortec's digital acceleration 6 * sensors BMA150 and SMB380. 7 * The SMB380 is fully compatible with BMA150 and only differs in packaging. 8 * 9 * The datasheet for the BMA150 chip can be found here: 10 * http://www.bosch-sensortec.com/content/language1/downloads/BST-BMA150-DS000-07.pdf 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or 15 * (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 25 */ 26 #include <linux/kernel.h> 27 #include <linux/module.h> 28 #include <linux/i2c.h> 29 #include <linux/input.h> 30 #include <linux/input-polldev.h> 31 #include <linux/interrupt.h> 32 #include <linux/delay.h> 33 #include <linux/slab.h> 34 #include <linux/pm.h> 35 #include <linux/pm_runtime.h> 36 #include <linux/bma150.h> 37 38 #define ABSMAX_ACC_VAL 0x01FF 39 #define ABSMIN_ACC_VAL -(ABSMAX_ACC_VAL) 40 41 /* Each axis is represented by a 2-byte data word */ 42 #define BMA150_XYZ_DATA_SIZE 6 43 44 /* Input poll interval in milliseconds */ 45 #define BMA150_POLL_INTERVAL 10 46 #define BMA150_POLL_MAX 200 47 #define BMA150_POLL_MIN 0 48 49 #define BMA150_MODE_NORMAL 0 50 #define BMA150_MODE_SLEEP 2 51 #define BMA150_MODE_WAKE_UP 3 52 53 /* Data register addresses */ 54 #define BMA150_DATA_0_REG 0x00 55 #define BMA150_DATA_1_REG 0x01 56 #define BMA150_DATA_2_REG 0x02 57 58 /* Control register addresses */ 59 #define BMA150_CTRL_0_REG 0x0A 60 #define BMA150_CTRL_1_REG 0x0B 61 #define BMA150_CTRL_2_REG 0x14 62 #define BMA150_CTRL_3_REG 0x15 63 64 /* Configuration/Setting register addresses */ 65 #define BMA150_CFG_0_REG 0x0C 66 #define BMA150_CFG_1_REG 0x0D 67 #define BMA150_CFG_2_REG 0x0E 68 #define BMA150_CFG_3_REG 0x0F 69 #define BMA150_CFG_4_REG 0x10 70 #define BMA150_CFG_5_REG 0x11 71 72 #define BMA150_CHIP_ID 2 73 #define BMA180_CHIP_ID 3 74 #define BMA150_CHIP_ID_REG BMA150_DATA_0_REG 75 76 #define BMA150_ACC_X_LSB_REG BMA150_DATA_2_REG 77 78 #define BMA150_SLEEP_POS 0 79 #define BMA150_SLEEP_MSK 0x01 80 #define BMA150_SLEEP_REG BMA150_CTRL_0_REG 81 82 #define BMA150_BANDWIDTH_POS 0 83 #define BMA150_BANDWIDTH_MSK 0x07 84 #define BMA150_BANDWIDTH_REG BMA150_CTRL_2_REG 85 86 #define BMA150_RANGE_POS 3 87 #define BMA150_RANGE_MSK 0x18 88 #define BMA150_RANGE_REG BMA150_CTRL_2_REG 89 90 #define BMA150_WAKE_UP_POS 0 91 #define BMA150_WAKE_UP_MSK 0x01 92 #define BMA150_WAKE_UP_REG BMA150_CTRL_3_REG 93 94 #define BMA150_SW_RES_POS 1 95 #define BMA150_SW_RES_MSK 0x02 96 #define BMA150_SW_RES_REG BMA150_CTRL_0_REG 97 98 /* Any-motion interrupt register fields */ 99 #define BMA150_ANY_MOTION_EN_POS 6 100 #define BMA150_ANY_MOTION_EN_MSK 0x40 101 #define BMA150_ANY_MOTION_EN_REG BMA150_CTRL_1_REG 102 103 #define BMA150_ANY_MOTION_DUR_POS 6 104 #define BMA150_ANY_MOTION_DUR_MSK 0xC0 105 #define BMA150_ANY_MOTION_DUR_REG BMA150_CFG_5_REG 106 107 #define BMA150_ANY_MOTION_THRES_REG BMA150_CFG_4_REG 108 109 /* Advanced interrupt register fields */ 110 #define BMA150_ADV_INT_EN_POS 6 111 #define BMA150_ADV_INT_EN_MSK 0x40 112 #define BMA150_ADV_INT_EN_REG BMA150_CTRL_3_REG 113 114 /* High-G interrupt register fields */ 115 #define BMA150_HIGH_G_EN_POS 1 116 #define BMA150_HIGH_G_EN_MSK 0x02 117 #define BMA150_HIGH_G_EN_REG BMA150_CTRL_1_REG 118 119 #define BMA150_HIGH_G_HYST_POS 3 120 #define BMA150_HIGH_G_HYST_MSK 0x38 121 #define BMA150_HIGH_G_HYST_REG BMA150_CFG_5_REG 122 123 #define BMA150_HIGH_G_DUR_REG BMA150_CFG_3_REG 124 #define BMA150_HIGH_G_THRES_REG BMA150_CFG_2_REG 125 126 /* Low-G interrupt register fields */ 127 #define BMA150_LOW_G_EN_POS 0 128 #define BMA150_LOW_G_EN_MSK 0x01 129 #define BMA150_LOW_G_EN_REG BMA150_CTRL_1_REG 130 131 #define BMA150_LOW_G_HYST_POS 0 132 #define BMA150_LOW_G_HYST_MSK 0x07 133 #define BMA150_LOW_G_HYST_REG BMA150_CFG_5_REG 134 135 #define BMA150_LOW_G_DUR_REG BMA150_CFG_1_REG 136 #define BMA150_LOW_G_THRES_REG BMA150_CFG_0_REG 137 138 struct bma150_data { 139 struct i2c_client *client; 140 struct input_polled_dev *input_polled; 141 struct input_dev *input; 142 u8 mode; 143 }; 144 145 /* 146 * The settings for the given range, bandwidth and interrupt features 147 * are stated and verified by Bosch Sensortec where they are configured 148 * to provide a generic sensitivity performance. 149 */ 150 static struct bma150_cfg default_cfg = { 151 .any_motion_int = 1, 152 .hg_int = 1, 153 .lg_int = 1, 154 .any_motion_dur = 0, 155 .any_motion_thres = 0, 156 .hg_hyst = 0, 157 .hg_dur = 150, 158 .hg_thres = 160, 159 .lg_hyst = 0, 160 .lg_dur = 150, 161 .lg_thres = 20, 162 .range = BMA150_RANGE_2G, 163 .bandwidth = BMA150_BW_50HZ 164 }; 165 166 static int bma150_write_byte(struct i2c_client *client, u8 reg, u8 val) 167 { 168 s32 ret; 169 170 /* As per specification, disable irq in between register writes */ 171 if (client->irq) 172 disable_irq_nosync(client->irq); 173 174 ret = i2c_smbus_write_byte_data(client, reg, val); 175 176 if (client->irq) 177 enable_irq(client->irq); 178 179 return ret; 180 } 181 182 static int bma150_set_reg_bits(struct i2c_client *client, 183 int val, int shift, u8 mask, u8 reg) 184 { 185 int data; 186 187 data = i2c_smbus_read_byte_data(client, reg); 188 if (data < 0) 189 return data; 190 191 data = (data & ~mask) | ((val << shift) & mask); 192 return bma150_write_byte(client, reg, data); 193 } 194 195 static int bma150_set_mode(struct bma150_data *bma150, u8 mode) 196 { 197 int error; 198 199 error = bma150_set_reg_bits(bma150->client, mode, BMA150_WAKE_UP_POS, 200 BMA150_WAKE_UP_MSK, BMA150_WAKE_UP_REG); 201 if (error) 202 return error; 203 204 error = bma150_set_reg_bits(bma150->client, mode, BMA150_SLEEP_POS, 205 BMA150_SLEEP_MSK, BMA150_SLEEP_REG); 206 if (error) 207 return error; 208 209 if (mode == BMA150_MODE_NORMAL) 210 msleep(2); 211 212 bma150->mode = mode; 213 return 0; 214 } 215 216 static int bma150_soft_reset(struct bma150_data *bma150) 217 { 218 int error; 219 220 error = bma150_set_reg_bits(bma150->client, 1, BMA150_SW_RES_POS, 221 BMA150_SW_RES_MSK, BMA150_SW_RES_REG); 222 if (error) 223 return error; 224 225 msleep(2); 226 return 0; 227 } 228 229 static int bma150_set_range(struct bma150_data *bma150, u8 range) 230 { 231 return bma150_set_reg_bits(bma150->client, range, BMA150_RANGE_POS, 232 BMA150_RANGE_MSK, BMA150_RANGE_REG); 233 } 234 235 static int bma150_set_bandwidth(struct bma150_data *bma150, u8 bw) 236 { 237 return bma150_set_reg_bits(bma150->client, bw, BMA150_BANDWIDTH_POS, 238 BMA150_BANDWIDTH_MSK, BMA150_BANDWIDTH_REG); 239 } 240 241 static int bma150_set_low_g_interrupt(struct bma150_data *bma150, 242 u8 enable, u8 hyst, u8 dur, u8 thres) 243 { 244 int error; 245 246 error = bma150_set_reg_bits(bma150->client, hyst, 247 BMA150_LOW_G_HYST_POS, BMA150_LOW_G_HYST_MSK, 248 BMA150_LOW_G_HYST_REG); 249 if (error) 250 return error; 251 252 error = bma150_write_byte(bma150->client, BMA150_LOW_G_DUR_REG, dur); 253 if (error) 254 return error; 255 256 error = bma150_write_byte(bma150->client, BMA150_LOW_G_THRES_REG, thres); 257 if (error) 258 return error; 259 260 return bma150_set_reg_bits(bma150->client, !!enable, 261 BMA150_LOW_G_EN_POS, BMA150_LOW_G_EN_MSK, 262 BMA150_LOW_G_EN_REG); 263 } 264 265 static int bma150_set_high_g_interrupt(struct bma150_data *bma150, 266 u8 enable, u8 hyst, u8 dur, u8 thres) 267 { 268 int error; 269 270 error = bma150_set_reg_bits(bma150->client, hyst, 271 BMA150_HIGH_G_HYST_POS, BMA150_HIGH_G_HYST_MSK, 272 BMA150_HIGH_G_HYST_REG); 273 if (error) 274 return error; 275 276 error = bma150_write_byte(bma150->client, 277 BMA150_HIGH_G_DUR_REG, dur); 278 if (error) 279 return error; 280 281 error = bma150_write_byte(bma150->client, 282 BMA150_HIGH_G_THRES_REG, thres); 283 if (error) 284 return error; 285 286 return bma150_set_reg_bits(bma150->client, !!enable, 287 BMA150_HIGH_G_EN_POS, BMA150_HIGH_G_EN_MSK, 288 BMA150_HIGH_G_EN_REG); 289 } 290 291 292 static int bma150_set_any_motion_interrupt(struct bma150_data *bma150, 293 u8 enable, u8 dur, u8 thres) 294 { 295 int error; 296 297 error = bma150_set_reg_bits(bma150->client, dur, 298 BMA150_ANY_MOTION_DUR_POS, 299 BMA150_ANY_MOTION_DUR_MSK, 300 BMA150_ANY_MOTION_DUR_REG); 301 if (error) 302 return error; 303 304 error = bma150_write_byte(bma150->client, 305 BMA150_ANY_MOTION_THRES_REG, thres); 306 if (error) 307 return error; 308 309 error = bma150_set_reg_bits(bma150->client, !!enable, 310 BMA150_ADV_INT_EN_POS, BMA150_ADV_INT_EN_MSK, 311 BMA150_ADV_INT_EN_REG); 312 if (error) 313 return error; 314 315 return bma150_set_reg_bits(bma150->client, !!enable, 316 BMA150_ANY_MOTION_EN_POS, 317 BMA150_ANY_MOTION_EN_MSK, 318 BMA150_ANY_MOTION_EN_REG); 319 } 320 321 static void bma150_report_xyz(struct bma150_data *bma150) 322 { 323 u8 data[BMA150_XYZ_DATA_SIZE]; 324 s16 x, y, z; 325 s32 ret; 326 327 ret = i2c_smbus_read_i2c_block_data(bma150->client, 328 BMA150_ACC_X_LSB_REG, BMA150_XYZ_DATA_SIZE, data); 329 if (ret != BMA150_XYZ_DATA_SIZE) 330 return; 331 332 x = ((0xc0 & data[0]) >> 6) | (data[1] << 2); 333 y = ((0xc0 & data[2]) >> 6) | (data[3] << 2); 334 z = ((0xc0 & data[4]) >> 6) | (data[5] << 2); 335 336 /* sign extension */ 337 x = (s16) (x << 6) >> 6; 338 y = (s16) (y << 6) >> 6; 339 z = (s16) (z << 6) >> 6; 340 341 input_report_abs(bma150->input, ABS_X, x); 342 input_report_abs(bma150->input, ABS_Y, y); 343 input_report_abs(bma150->input, ABS_Z, z); 344 input_sync(bma150->input); 345 } 346 347 static irqreturn_t bma150_irq_thread(int irq, void *dev) 348 { 349 bma150_report_xyz(dev); 350 351 return IRQ_HANDLED; 352 } 353 354 static void bma150_poll(struct input_polled_dev *dev) 355 { 356 bma150_report_xyz(dev->private); 357 } 358 359 static int bma150_open(struct bma150_data *bma150) 360 { 361 int error; 362 363 error = pm_runtime_get_sync(&bma150->client->dev); 364 if (error < 0 && error != -ENOSYS) 365 return error; 366 367 /* 368 * See if runtime PM woke up the device. If runtime PM 369 * is disabled we need to do it ourselves. 370 */ 371 if (bma150->mode != BMA150_MODE_NORMAL) { 372 error = bma150_set_mode(bma150, BMA150_MODE_NORMAL); 373 if (error) 374 return error; 375 } 376 377 return 0; 378 } 379 380 static void bma150_close(struct bma150_data *bma150) 381 { 382 pm_runtime_put_sync(&bma150->client->dev); 383 384 if (bma150->mode != BMA150_MODE_SLEEP) 385 bma150_set_mode(bma150, BMA150_MODE_SLEEP); 386 } 387 388 static int bma150_irq_open(struct input_dev *input) 389 { 390 struct bma150_data *bma150 = input_get_drvdata(input); 391 392 return bma150_open(bma150); 393 } 394 395 static void bma150_irq_close(struct input_dev *input) 396 { 397 struct bma150_data *bma150 = input_get_drvdata(input); 398 399 bma150_close(bma150); 400 } 401 402 static void bma150_poll_open(struct input_polled_dev *ipoll_dev) 403 { 404 struct bma150_data *bma150 = ipoll_dev->private; 405 406 bma150_open(bma150); 407 } 408 409 static void bma150_poll_close(struct input_polled_dev *ipoll_dev) 410 { 411 struct bma150_data *bma150 = ipoll_dev->private; 412 413 bma150_close(bma150); 414 } 415 416 static int bma150_initialize(struct bma150_data *bma150, 417 const struct bma150_cfg *cfg) 418 { 419 int error; 420 421 error = bma150_soft_reset(bma150); 422 if (error) 423 return error; 424 425 error = bma150_set_bandwidth(bma150, cfg->bandwidth); 426 if (error) 427 return error; 428 429 error = bma150_set_range(bma150, cfg->range); 430 if (error) 431 return error; 432 433 if (bma150->client->irq) { 434 error = bma150_set_any_motion_interrupt(bma150, 435 cfg->any_motion_int, 436 cfg->any_motion_dur, 437 cfg->any_motion_thres); 438 if (error) 439 return error; 440 441 error = bma150_set_high_g_interrupt(bma150, 442 cfg->hg_int, cfg->hg_hyst, 443 cfg->hg_dur, cfg->hg_thres); 444 if (error) 445 return error; 446 447 error = bma150_set_low_g_interrupt(bma150, 448 cfg->lg_int, cfg->lg_hyst, 449 cfg->lg_dur, cfg->lg_thres); 450 if (error) 451 return error; 452 } 453 454 return bma150_set_mode(bma150, BMA150_MODE_SLEEP); 455 } 456 457 static void bma150_init_input_device(struct bma150_data *bma150, 458 struct input_dev *idev) 459 { 460 idev->name = BMA150_DRIVER; 461 idev->phys = BMA150_DRIVER "/input0"; 462 idev->id.bustype = BUS_I2C; 463 idev->dev.parent = &bma150->client->dev; 464 465 idev->evbit[0] = BIT_MASK(EV_ABS); 466 input_set_abs_params(idev, ABS_X, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0); 467 input_set_abs_params(idev, ABS_Y, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0); 468 input_set_abs_params(idev, ABS_Z, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0); 469 } 470 471 static int bma150_register_input_device(struct bma150_data *bma150) 472 { 473 struct input_dev *idev; 474 int error; 475 476 idev = input_allocate_device(); 477 if (!idev) 478 return -ENOMEM; 479 480 bma150_init_input_device(bma150, idev); 481 482 idev->open = bma150_irq_open; 483 idev->close = bma150_irq_close; 484 input_set_drvdata(idev, bma150); 485 486 error = input_register_device(idev); 487 if (error) { 488 input_free_device(idev); 489 return error; 490 } 491 492 bma150->input = idev; 493 return 0; 494 } 495 496 static int bma150_register_polled_device(struct bma150_data *bma150) 497 { 498 struct input_polled_dev *ipoll_dev; 499 int error; 500 501 ipoll_dev = input_allocate_polled_device(); 502 if (!ipoll_dev) 503 return -ENOMEM; 504 505 ipoll_dev->private = bma150; 506 ipoll_dev->open = bma150_poll_open; 507 ipoll_dev->close = bma150_poll_close; 508 ipoll_dev->poll = bma150_poll; 509 ipoll_dev->poll_interval = BMA150_POLL_INTERVAL; 510 ipoll_dev->poll_interval_min = BMA150_POLL_MIN; 511 ipoll_dev->poll_interval_max = BMA150_POLL_MAX; 512 513 bma150_init_input_device(bma150, ipoll_dev->input); 514 515 error = input_register_polled_device(ipoll_dev); 516 if (error) { 517 input_free_polled_device(ipoll_dev); 518 return error; 519 } 520 521 bma150->input_polled = ipoll_dev; 522 bma150->input = ipoll_dev->input; 523 524 return 0; 525 } 526 527 static int bma150_probe(struct i2c_client *client, 528 const struct i2c_device_id *id) 529 { 530 const struct bma150_platform_data *pdata = 531 dev_get_platdata(&client->dev); 532 const struct bma150_cfg *cfg; 533 struct bma150_data *bma150; 534 int chip_id; 535 int error; 536 537 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { 538 dev_err(&client->dev, "i2c_check_functionality error\n"); 539 return -EIO; 540 } 541 542 chip_id = i2c_smbus_read_byte_data(client, BMA150_CHIP_ID_REG); 543 if (chip_id != BMA150_CHIP_ID && chip_id != BMA180_CHIP_ID) { 544 dev_err(&client->dev, "BMA150 chip id error: %d\n", chip_id); 545 return -EINVAL; 546 } 547 548 bma150 = kzalloc(sizeof(struct bma150_data), GFP_KERNEL); 549 if (!bma150) 550 return -ENOMEM; 551 552 bma150->client = client; 553 554 if (pdata) { 555 if (pdata->irq_gpio_cfg) { 556 error = pdata->irq_gpio_cfg(); 557 if (error) { 558 dev_err(&client->dev, 559 "IRQ GPIO conf. error %d, error %d\n", 560 client->irq, error); 561 goto err_free_mem; 562 } 563 } 564 cfg = &pdata->cfg; 565 } else { 566 cfg = &default_cfg; 567 } 568 569 error = bma150_initialize(bma150, cfg); 570 if (error) 571 goto err_free_mem; 572 573 if (client->irq > 0) { 574 error = bma150_register_input_device(bma150); 575 if (error) 576 goto err_free_mem; 577 578 error = request_threaded_irq(client->irq, 579 NULL, bma150_irq_thread, 580 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 581 BMA150_DRIVER, bma150); 582 if (error) { 583 dev_err(&client->dev, 584 "irq request failed %d, error %d\n", 585 client->irq, error); 586 input_unregister_device(bma150->input); 587 goto err_free_mem; 588 } 589 } else { 590 error = bma150_register_polled_device(bma150); 591 if (error) 592 goto err_free_mem; 593 } 594 595 i2c_set_clientdata(client, bma150); 596 597 pm_runtime_enable(&client->dev); 598 599 return 0; 600 601 err_free_mem: 602 kfree(bma150); 603 return error; 604 } 605 606 static int bma150_remove(struct i2c_client *client) 607 { 608 struct bma150_data *bma150 = i2c_get_clientdata(client); 609 610 pm_runtime_disable(&client->dev); 611 612 if (client->irq > 0) { 613 free_irq(client->irq, bma150); 614 input_unregister_device(bma150->input); 615 } else { 616 input_unregister_polled_device(bma150->input_polled); 617 input_free_polled_device(bma150->input_polled); 618 } 619 620 kfree(bma150); 621 622 return 0; 623 } 624 625 #ifdef CONFIG_PM 626 static int bma150_suspend(struct device *dev) 627 { 628 struct i2c_client *client = to_i2c_client(dev); 629 struct bma150_data *bma150 = i2c_get_clientdata(client); 630 631 return bma150_set_mode(bma150, BMA150_MODE_SLEEP); 632 } 633 634 static int bma150_resume(struct device *dev) 635 { 636 struct i2c_client *client = to_i2c_client(dev); 637 struct bma150_data *bma150 = i2c_get_clientdata(client); 638 639 return bma150_set_mode(bma150, BMA150_MODE_NORMAL); 640 } 641 #endif 642 643 static UNIVERSAL_DEV_PM_OPS(bma150_pm, bma150_suspend, bma150_resume, NULL); 644 645 static const struct i2c_device_id bma150_id[] = { 646 { "bma150", 0 }, 647 { "bma180", 0 }, 648 { "smb380", 0 }, 649 { "bma023", 0 }, 650 { } 651 }; 652 653 MODULE_DEVICE_TABLE(i2c, bma150_id); 654 655 static struct i2c_driver bma150_driver = { 656 .driver = { 657 .owner = THIS_MODULE, 658 .name = BMA150_DRIVER, 659 .pm = &bma150_pm, 660 }, 661 .class = I2C_CLASS_HWMON, 662 .id_table = bma150_id, 663 .probe = bma150_probe, 664 .remove = bma150_remove, 665 }; 666 667 module_i2c_driver(bma150_driver); 668 669 MODULE_AUTHOR("Albert Zhang <xu.zhang@bosch-sensortec.com>"); 670 MODULE_DESCRIPTION("BMA150 driver"); 671 MODULE_LICENSE("GPL"); 672