1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * lis3lv02d.c - ST LIS3LV02DL accelerometer driver 4 * 5 * Copyright (C) 2007-2008 Yan Burman 6 * Copyright (C) 2008 Eric Piel 7 * Copyright (C) 2008-2009 Pavel Machek 8 */ 9 10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 11 12 #include <linux/kernel.h> 13 #include <linux/sched/signal.h> 14 #include <linux/dmi.h> 15 #include <linux/module.h> 16 #include <linux/types.h> 17 #include <linux/platform_device.h> 18 #include <linux/interrupt.h> 19 #include <linux/input.h> 20 #include <linux/delay.h> 21 #include <linux/wait.h> 22 #include <linux/poll.h> 23 #include <linux/slab.h> 24 #include <linux/freezer.h> 25 #include <linux/uaccess.h> 26 #include <linux/miscdevice.h> 27 #include <linux/pm_runtime.h> 28 #include <linux/atomic.h> 29 #include <linux/of_device.h> 30 #include "lis3lv02d.h" 31 32 #define DRIVER_NAME "lis3lv02d" 33 34 /* joystick device poll interval in milliseconds */ 35 #define MDPS_POLL_INTERVAL 50 36 #define MDPS_POLL_MIN 0 37 #define MDPS_POLL_MAX 2000 38 39 #define LIS3_SYSFS_POWERDOWN_DELAY 5000 /* In milliseconds */ 40 41 #define SELFTEST_OK 0 42 #define SELFTEST_FAIL -1 43 #define SELFTEST_IRQ -2 44 45 #define IRQ_LINE0 0 46 #define IRQ_LINE1 1 47 48 /* 49 * The sensor can also generate interrupts (DRDY) but it's pretty pointless 50 * because they are generated even if the data do not change. So it's better 51 * to keep the interrupt for the free-fall event. The values are updated at 52 * 40Hz (at the lowest frequency), but as it can be pretty time consuming on 53 * some low processor, we poll the sensor only at 20Hz... enough for the 54 * joystick. 55 */ 56 57 #define LIS3_PWRON_DELAY_WAI_12B (5000) 58 #define LIS3_PWRON_DELAY_WAI_8B (3000) 59 60 /* 61 * LIS3LV02D spec says 1024 LSBs corresponds 1 G -> 1LSB is 1000/1024 mG 62 * LIS302D spec says: 18 mG / digit 63 * LIS3_ACCURACY is used to increase accuracy of the intermediate 64 * calculation results. 65 */ 66 #define LIS3_ACCURACY 1024 67 /* Sensitivity values for -2G +2G scale */ 68 #define LIS3_SENSITIVITY_12B ((LIS3_ACCURACY * 1000) / 1024) 69 #define LIS3_SENSITIVITY_8B (18 * LIS3_ACCURACY) 70 71 /* 72 * LIS331DLH spec says 1LSBs corresponds 4G/4096 -> 1LSB is 1000/1024 mG. 73 * Below macros defines sensitivity values for +/-2G. Dataout bits for 74 * +/-2G range is 12 bits so 4 bits adjustment must be done to get 12bit 75 * data from 16bit value. Currently this driver supports only 2G range. 76 */ 77 #define LIS3DLH_SENSITIVITY_2G ((LIS3_ACCURACY * 1000) / 1024) 78 #define SHIFT_ADJ_2G 4 79 80 #define LIS3_DEFAULT_FUZZ_12B 3 81 #define LIS3_DEFAULT_FLAT_12B 3 82 #define LIS3_DEFAULT_FUZZ_8B 1 83 #define LIS3_DEFAULT_FLAT_8B 1 84 85 struct lis3lv02d lis3_dev = { 86 .misc_wait = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait), 87 }; 88 EXPORT_SYMBOL_GPL(lis3_dev); 89 90 /* just like param_set_int() but does sanity-check so that it won't point 91 * over the axis array size 92 */ 93 static int param_set_axis(const char *val, const struct kernel_param *kp) 94 { 95 int ret = param_set_int(val, kp); 96 if (!ret) { 97 int val = *(int *)kp->arg; 98 if (val < 0) 99 val = -val; 100 if (!val || val > 3) 101 return -EINVAL; 102 } 103 return ret; 104 } 105 106 static const struct kernel_param_ops param_ops_axis = { 107 .set = param_set_axis, 108 .get = param_get_int, 109 }; 110 111 #define param_check_axis(name, p) param_check_int(name, p) 112 113 module_param_array_named(axes, lis3_dev.ac.as_array, axis, NULL, 0644); 114 MODULE_PARM_DESC(axes, "Axis-mapping for x,y,z directions"); 115 116 static s16 lis3lv02d_read_8(struct lis3lv02d *lis3, int reg) 117 { 118 s8 lo; 119 if (lis3->read(lis3, reg, &lo) < 0) 120 return 0; 121 122 return lo; 123 } 124 125 static s16 lis3lv02d_read_12(struct lis3lv02d *lis3, int reg) 126 { 127 u8 lo, hi; 128 129 lis3->read(lis3, reg - 1, &lo); 130 lis3->read(lis3, reg, &hi); 131 /* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */ 132 return (s16)((hi << 8) | lo); 133 } 134 135 /* 12bits for 2G range, 13 bits for 4G range and 14 bits for 8G range */ 136 static s16 lis331dlh_read_data(struct lis3lv02d *lis3, int reg) 137 { 138 u8 lo, hi; 139 int v; 140 141 lis3->read(lis3, reg - 1, &lo); 142 lis3->read(lis3, reg, &hi); 143 v = (int) ((hi << 8) | lo); 144 145 return (s16) v >> lis3->shift_adj; 146 } 147 148 /** 149 * lis3lv02d_get_axis - For the given axis, give the value converted 150 * @axis: 1,2,3 - can also be negative 151 * @hw_values: raw values returned by the hardware 152 * 153 * Returns the converted value. 154 */ 155 static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3]) 156 { 157 if (axis > 0) 158 return hw_values[axis - 1]; 159 else 160 return -hw_values[-axis - 1]; 161 } 162 163 /** 164 * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer 165 * @lis3: pointer to the device struct 166 * @x: where to store the X axis value 167 * @y: where to store the Y axis value 168 * @z: where to store the Z axis value 169 * 170 * Note that 40Hz input device can eat up about 10% CPU at 800MHZ 171 */ 172 static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z) 173 { 174 int position[3]; 175 int i; 176 177 if (lis3->blkread) { 178 if (lis3->whoami == WAI_12B) { 179 u16 data[3]; 180 lis3->blkread(lis3, OUTX_L, 6, (u8 *)data); 181 for (i = 0; i < 3; i++) 182 position[i] = (s16)le16_to_cpu(data[i]); 183 } else { 184 u8 data[5]; 185 /* Data: x, dummy, y, dummy, z */ 186 lis3->blkread(lis3, OUTX, 5, data); 187 for (i = 0; i < 3; i++) 188 position[i] = (s8)data[i * 2]; 189 } 190 } else { 191 position[0] = lis3->read_data(lis3, OUTX); 192 position[1] = lis3->read_data(lis3, OUTY); 193 position[2] = lis3->read_data(lis3, OUTZ); 194 } 195 196 for (i = 0; i < 3; i++) 197 position[i] = (position[i] * lis3->scale) / LIS3_ACCURACY; 198 199 *x = lis3lv02d_get_axis(lis3->ac.x, position); 200 *y = lis3lv02d_get_axis(lis3->ac.y, position); 201 *z = lis3lv02d_get_axis(lis3->ac.z, position); 202 } 203 204 /* conversion btw sampling rate and the register values */ 205 static int lis3_12_rates[4] = {40, 160, 640, 2560}; 206 static int lis3_8_rates[2] = {100, 400}; 207 static int lis3_3dc_rates[16] = {0, 1, 10, 25, 50, 100, 200, 400, 1600, 5000}; 208 static int lis3_3dlh_rates[4] = {50, 100, 400, 1000}; 209 210 /* ODR is Output Data Rate */ 211 static int lis3lv02d_get_odr_index(struct lis3lv02d *lis3) 212 { 213 u8 ctrl; 214 int shift; 215 216 lis3->read(lis3, CTRL_REG1, &ctrl); 217 ctrl &= lis3->odr_mask; 218 shift = ffs(lis3->odr_mask) - 1; 219 return (ctrl >> shift); 220 } 221 222 static int lis3lv02d_get_pwron_wait(struct lis3lv02d *lis3) 223 { 224 int odr_idx = lis3lv02d_get_odr_index(lis3); 225 int div = lis3->odrs[odr_idx]; 226 227 if (div == 0) { 228 if (odr_idx == 0) { 229 /* Power-down mode, not sampling no need to sleep */ 230 return 0; 231 } 232 233 dev_err(&lis3->pdev->dev, "Error unknown odrs-index: %d\n", odr_idx); 234 return -ENXIO; 235 } 236 237 /* LIS3 power on delay is quite long */ 238 msleep(lis3->pwron_delay / div); 239 return 0; 240 } 241 242 static int lis3lv02d_set_odr(struct lis3lv02d *lis3, int rate) 243 { 244 u8 ctrl; 245 int i, len, shift; 246 247 if (!rate) 248 return -EINVAL; 249 250 lis3->read(lis3, CTRL_REG1, &ctrl); 251 ctrl &= ~lis3->odr_mask; 252 len = 1 << hweight_long(lis3->odr_mask); /* # of possible values */ 253 shift = ffs(lis3->odr_mask) - 1; 254 255 for (i = 0; i < len; i++) 256 if (lis3->odrs[i] == rate) { 257 lis3->write(lis3, CTRL_REG1, 258 ctrl | (i << shift)); 259 return 0; 260 } 261 return -EINVAL; 262 } 263 264 static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3]) 265 { 266 u8 ctlreg, reg; 267 s16 x, y, z; 268 u8 selftest; 269 int ret; 270 u8 ctrl_reg_data; 271 unsigned char irq_cfg; 272 273 mutex_lock(&lis3->mutex); 274 275 irq_cfg = lis3->irq_cfg; 276 if (lis3->whoami == WAI_8B) { 277 lis3->data_ready_count[IRQ_LINE0] = 0; 278 lis3->data_ready_count[IRQ_LINE1] = 0; 279 280 /* Change interrupt cfg to data ready for selftest */ 281 atomic_inc(&lis3->wake_thread); 282 lis3->irq_cfg = LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY; 283 lis3->read(lis3, CTRL_REG3, &ctrl_reg_data); 284 lis3->write(lis3, CTRL_REG3, (ctrl_reg_data & 285 ~(LIS3_IRQ1_MASK | LIS3_IRQ2_MASK)) | 286 (LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY)); 287 } 288 289 if ((lis3->whoami == WAI_3DC) || (lis3->whoami == WAI_3DLH)) { 290 ctlreg = CTRL_REG4; 291 selftest = CTRL4_ST0; 292 } else { 293 ctlreg = CTRL_REG1; 294 if (lis3->whoami == WAI_12B) 295 selftest = CTRL1_ST; 296 else 297 selftest = CTRL1_STP; 298 } 299 300 lis3->read(lis3, ctlreg, ®); 301 lis3->write(lis3, ctlreg, (reg | selftest)); 302 ret = lis3lv02d_get_pwron_wait(lis3); 303 if (ret) 304 goto fail; 305 306 /* Read directly to avoid axis remap */ 307 x = lis3->read_data(lis3, OUTX); 308 y = lis3->read_data(lis3, OUTY); 309 z = lis3->read_data(lis3, OUTZ); 310 311 /* back to normal settings */ 312 lis3->write(lis3, ctlreg, reg); 313 ret = lis3lv02d_get_pwron_wait(lis3); 314 if (ret) 315 goto fail; 316 317 results[0] = x - lis3->read_data(lis3, OUTX); 318 results[1] = y - lis3->read_data(lis3, OUTY); 319 results[2] = z - lis3->read_data(lis3, OUTZ); 320 321 ret = 0; 322 323 if (lis3->whoami == WAI_8B) { 324 /* Restore original interrupt configuration */ 325 atomic_dec(&lis3->wake_thread); 326 lis3->write(lis3, CTRL_REG3, ctrl_reg_data); 327 lis3->irq_cfg = irq_cfg; 328 329 if ((irq_cfg & LIS3_IRQ1_MASK) && 330 lis3->data_ready_count[IRQ_LINE0] < 2) { 331 ret = SELFTEST_IRQ; 332 goto fail; 333 } 334 335 if ((irq_cfg & LIS3_IRQ2_MASK) && 336 lis3->data_ready_count[IRQ_LINE1] < 2) { 337 ret = SELFTEST_IRQ; 338 goto fail; 339 } 340 } 341 342 if (lis3->pdata) { 343 int i; 344 for (i = 0; i < 3; i++) { 345 /* Check against selftest acceptance limits */ 346 if ((results[i] < lis3->pdata->st_min_limits[i]) || 347 (results[i] > lis3->pdata->st_max_limits[i])) { 348 ret = SELFTEST_FAIL; 349 goto fail; 350 } 351 } 352 } 353 354 /* test passed */ 355 fail: 356 mutex_unlock(&lis3->mutex); 357 return ret; 358 } 359 360 /* 361 * Order of registers in the list affects to order of the restore process. 362 * Perhaps it is a good idea to set interrupt enable register as a last one 363 * after all other configurations 364 */ 365 static u8 lis3_wai8_regs[] = { FF_WU_CFG_1, FF_WU_THS_1, FF_WU_DURATION_1, 366 FF_WU_CFG_2, FF_WU_THS_2, FF_WU_DURATION_2, 367 CLICK_CFG, CLICK_SRC, CLICK_THSY_X, CLICK_THSZ, 368 CLICK_TIMELIMIT, CLICK_LATENCY, CLICK_WINDOW, 369 CTRL_REG1, CTRL_REG2, CTRL_REG3}; 370 371 static u8 lis3_wai12_regs[] = {FF_WU_CFG, FF_WU_THS_L, FF_WU_THS_H, 372 FF_WU_DURATION, DD_CFG, DD_THSI_L, DD_THSI_H, 373 DD_THSE_L, DD_THSE_H, 374 CTRL_REG1, CTRL_REG3, CTRL_REG2}; 375 376 static inline void lis3_context_save(struct lis3lv02d *lis3) 377 { 378 int i; 379 for (i = 0; i < lis3->regs_size; i++) 380 lis3->read(lis3, lis3->regs[i], &lis3->reg_cache[i]); 381 lis3->regs_stored = true; 382 } 383 384 static inline void lis3_context_restore(struct lis3lv02d *lis3) 385 { 386 int i; 387 if (lis3->regs_stored) 388 for (i = 0; i < lis3->regs_size; i++) 389 lis3->write(lis3, lis3->regs[i], lis3->reg_cache[i]); 390 } 391 392 void lis3lv02d_poweroff(struct lis3lv02d *lis3) 393 { 394 if (lis3->reg_ctrl) 395 lis3_context_save(lis3); 396 /* disable X,Y,Z axis and power down */ 397 lis3->write(lis3, CTRL_REG1, 0x00); 398 if (lis3->reg_ctrl) 399 lis3->reg_ctrl(lis3, LIS3_REG_OFF); 400 } 401 EXPORT_SYMBOL_GPL(lis3lv02d_poweroff); 402 403 int lis3lv02d_poweron(struct lis3lv02d *lis3) 404 { 405 int err; 406 u8 reg; 407 408 lis3->init(lis3); 409 410 /* 411 * Common configuration 412 * BDU: (12 bits sensors only) LSB and MSB values are not updated until 413 * both have been read. So the value read will always be correct. 414 * Set BOOT bit to refresh factory tuning values. 415 */ 416 if (lis3->pdata) { 417 lis3->read(lis3, CTRL_REG2, ®); 418 if (lis3->whoami == WAI_12B) 419 reg |= CTRL2_BDU | CTRL2_BOOT; 420 else if (lis3->whoami == WAI_3DLH) 421 reg |= CTRL2_BOOT_3DLH; 422 else 423 reg |= CTRL2_BOOT_8B; 424 lis3->write(lis3, CTRL_REG2, reg); 425 426 if (lis3->whoami == WAI_3DLH) { 427 lis3->read(lis3, CTRL_REG4, ®); 428 reg |= CTRL4_BDU; 429 lis3->write(lis3, CTRL_REG4, reg); 430 } 431 } 432 433 err = lis3lv02d_get_pwron_wait(lis3); 434 if (err) 435 return err; 436 437 if (lis3->reg_ctrl) 438 lis3_context_restore(lis3); 439 440 return 0; 441 } 442 EXPORT_SYMBOL_GPL(lis3lv02d_poweron); 443 444 445 static void lis3lv02d_joystick_poll(struct input_dev *input) 446 { 447 struct lis3lv02d *lis3 = input_get_drvdata(input); 448 int x, y, z; 449 450 mutex_lock(&lis3->mutex); 451 lis3lv02d_get_xyz(lis3, &x, &y, &z); 452 input_report_abs(input, ABS_X, x); 453 input_report_abs(input, ABS_Y, y); 454 input_report_abs(input, ABS_Z, z); 455 input_sync(input); 456 mutex_unlock(&lis3->mutex); 457 } 458 459 static int lis3lv02d_joystick_open(struct input_dev *input) 460 { 461 struct lis3lv02d *lis3 = input_get_drvdata(input); 462 463 if (lis3->pm_dev) 464 pm_runtime_get_sync(lis3->pm_dev); 465 466 if (lis3->pdata && lis3->whoami == WAI_8B && lis3->idev) 467 atomic_set(&lis3->wake_thread, 1); 468 /* 469 * Update coordinates for the case where poll interval is 0 and 470 * the chip in running purely under interrupt control 471 */ 472 lis3lv02d_joystick_poll(input); 473 474 return 0; 475 } 476 477 static void lis3lv02d_joystick_close(struct input_dev *input) 478 { 479 struct lis3lv02d *lis3 = input_get_drvdata(input); 480 481 atomic_set(&lis3->wake_thread, 0); 482 if (lis3->pm_dev) 483 pm_runtime_put(lis3->pm_dev); 484 } 485 486 static irqreturn_t lis302dl_interrupt(int irq, void *data) 487 { 488 struct lis3lv02d *lis3 = data; 489 490 if (!test_bit(0, &lis3->misc_opened)) 491 goto out; 492 493 /* 494 * Be careful: on some HP laptops the bios force DD when on battery and 495 * the lid is closed. This leads to interrupts as soon as a little move 496 * is done. 497 */ 498 atomic_inc(&lis3->count); 499 500 wake_up_interruptible(&lis3->misc_wait); 501 kill_fasync(&lis3->async_queue, SIGIO, POLL_IN); 502 out: 503 if (atomic_read(&lis3->wake_thread)) 504 return IRQ_WAKE_THREAD; 505 return IRQ_HANDLED; 506 } 507 508 static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3) 509 { 510 struct input_dev *dev = lis3->idev; 511 u8 click_src; 512 513 mutex_lock(&lis3->mutex); 514 lis3->read(lis3, CLICK_SRC, &click_src); 515 516 if (click_src & CLICK_SINGLE_X) { 517 input_report_key(dev, lis3->mapped_btns[0], 1); 518 input_report_key(dev, lis3->mapped_btns[0], 0); 519 } 520 521 if (click_src & CLICK_SINGLE_Y) { 522 input_report_key(dev, lis3->mapped_btns[1], 1); 523 input_report_key(dev, lis3->mapped_btns[1], 0); 524 } 525 526 if (click_src & CLICK_SINGLE_Z) { 527 input_report_key(dev, lis3->mapped_btns[2], 1); 528 input_report_key(dev, lis3->mapped_btns[2], 0); 529 } 530 input_sync(dev); 531 mutex_unlock(&lis3->mutex); 532 } 533 534 static inline void lis302dl_data_ready(struct lis3lv02d *lis3, int index) 535 { 536 int dummy; 537 538 /* Dummy read to ack interrupt */ 539 lis3lv02d_get_xyz(lis3, &dummy, &dummy, &dummy); 540 lis3->data_ready_count[index]++; 541 } 542 543 static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data) 544 { 545 struct lis3lv02d *lis3 = data; 546 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ1_MASK; 547 548 if (irq_cfg == LIS3_IRQ1_CLICK) 549 lis302dl_interrupt_handle_click(lis3); 550 else if (unlikely(irq_cfg == LIS3_IRQ1_DATA_READY)) 551 lis302dl_data_ready(lis3, IRQ_LINE0); 552 else 553 lis3lv02d_joystick_poll(lis3->idev); 554 555 return IRQ_HANDLED; 556 } 557 558 static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data) 559 { 560 struct lis3lv02d *lis3 = data; 561 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ2_MASK; 562 563 if (irq_cfg == LIS3_IRQ2_CLICK) 564 lis302dl_interrupt_handle_click(lis3); 565 else if (unlikely(irq_cfg == LIS3_IRQ2_DATA_READY)) 566 lis302dl_data_ready(lis3, IRQ_LINE1); 567 else 568 lis3lv02d_joystick_poll(lis3->idev); 569 570 return IRQ_HANDLED; 571 } 572 573 static int lis3lv02d_misc_open(struct inode *inode, struct file *file) 574 { 575 struct lis3lv02d *lis3 = container_of(file->private_data, 576 struct lis3lv02d, miscdev); 577 578 if (test_and_set_bit(0, &lis3->misc_opened)) 579 return -EBUSY; /* already open */ 580 581 if (lis3->pm_dev) 582 pm_runtime_get_sync(lis3->pm_dev); 583 584 atomic_set(&lis3->count, 0); 585 return 0; 586 } 587 588 static int lis3lv02d_misc_release(struct inode *inode, struct file *file) 589 { 590 struct lis3lv02d *lis3 = container_of(file->private_data, 591 struct lis3lv02d, miscdev); 592 593 clear_bit(0, &lis3->misc_opened); /* release the device */ 594 if (lis3->pm_dev) 595 pm_runtime_put(lis3->pm_dev); 596 return 0; 597 } 598 599 static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf, 600 size_t count, loff_t *pos) 601 { 602 struct lis3lv02d *lis3 = container_of(file->private_data, 603 struct lis3lv02d, miscdev); 604 605 DECLARE_WAITQUEUE(wait, current); 606 u32 data; 607 unsigned char byte_data; 608 ssize_t retval = 1; 609 610 if (count < 1) 611 return -EINVAL; 612 613 add_wait_queue(&lis3->misc_wait, &wait); 614 while (true) { 615 set_current_state(TASK_INTERRUPTIBLE); 616 data = atomic_xchg(&lis3->count, 0); 617 if (data) 618 break; 619 620 if (file->f_flags & O_NONBLOCK) { 621 retval = -EAGAIN; 622 goto out; 623 } 624 625 if (signal_pending(current)) { 626 retval = -ERESTARTSYS; 627 goto out; 628 } 629 630 schedule(); 631 } 632 633 if (data < 255) 634 byte_data = data; 635 else 636 byte_data = 255; 637 638 /* make sure we are not going into copy_to_user() with 639 * TASK_INTERRUPTIBLE state */ 640 set_current_state(TASK_RUNNING); 641 if (copy_to_user(buf, &byte_data, sizeof(byte_data))) 642 retval = -EFAULT; 643 644 out: 645 __set_current_state(TASK_RUNNING); 646 remove_wait_queue(&lis3->misc_wait, &wait); 647 648 return retval; 649 } 650 651 static __poll_t lis3lv02d_misc_poll(struct file *file, poll_table *wait) 652 { 653 struct lis3lv02d *lis3 = container_of(file->private_data, 654 struct lis3lv02d, miscdev); 655 656 poll_wait(file, &lis3->misc_wait, wait); 657 if (atomic_read(&lis3->count)) 658 return EPOLLIN | EPOLLRDNORM; 659 return 0; 660 } 661 662 static int lis3lv02d_misc_fasync(int fd, struct file *file, int on) 663 { 664 struct lis3lv02d *lis3 = container_of(file->private_data, 665 struct lis3lv02d, miscdev); 666 667 return fasync_helper(fd, file, on, &lis3->async_queue); 668 } 669 670 static const struct file_operations lis3lv02d_misc_fops = { 671 .owner = THIS_MODULE, 672 .llseek = no_llseek, 673 .read = lis3lv02d_misc_read, 674 .open = lis3lv02d_misc_open, 675 .release = lis3lv02d_misc_release, 676 .poll = lis3lv02d_misc_poll, 677 .fasync = lis3lv02d_misc_fasync, 678 }; 679 680 int lis3lv02d_joystick_enable(struct lis3lv02d *lis3) 681 { 682 struct input_dev *input_dev; 683 int err; 684 int max_val, fuzz, flat; 685 int btns[] = {BTN_X, BTN_Y, BTN_Z}; 686 687 if (lis3->idev) 688 return -EINVAL; 689 690 input_dev = input_allocate_device(); 691 if (!input_dev) 692 return -ENOMEM; 693 694 input_dev->name = "ST LIS3LV02DL Accelerometer"; 695 input_dev->phys = DRIVER_NAME "/input0"; 696 input_dev->id.bustype = BUS_HOST; 697 input_dev->id.vendor = 0; 698 input_dev->dev.parent = &lis3->pdev->dev; 699 700 input_dev->open = lis3lv02d_joystick_open; 701 input_dev->close = lis3lv02d_joystick_close; 702 703 max_val = (lis3->mdps_max_val * lis3->scale) / LIS3_ACCURACY; 704 if (lis3->whoami == WAI_12B) { 705 fuzz = LIS3_DEFAULT_FUZZ_12B; 706 flat = LIS3_DEFAULT_FLAT_12B; 707 } else { 708 fuzz = LIS3_DEFAULT_FUZZ_8B; 709 flat = LIS3_DEFAULT_FLAT_8B; 710 } 711 fuzz = (fuzz * lis3->scale) / LIS3_ACCURACY; 712 flat = (flat * lis3->scale) / LIS3_ACCURACY; 713 714 input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat); 715 input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat); 716 input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat); 717 718 input_set_drvdata(input_dev, lis3); 719 lis3->idev = input_dev; 720 721 err = input_setup_polling(input_dev, lis3lv02d_joystick_poll); 722 if (err) 723 goto err_free_input; 724 725 input_set_poll_interval(input_dev, MDPS_POLL_INTERVAL); 726 input_set_min_poll_interval(input_dev, MDPS_POLL_MIN); 727 input_set_max_poll_interval(input_dev, MDPS_POLL_MAX); 728 729 lis3->mapped_btns[0] = lis3lv02d_get_axis(abs(lis3->ac.x), btns); 730 lis3->mapped_btns[1] = lis3lv02d_get_axis(abs(lis3->ac.y), btns); 731 lis3->mapped_btns[2] = lis3lv02d_get_axis(abs(lis3->ac.z), btns); 732 733 err = input_register_device(lis3->idev); 734 if (err) 735 goto err_free_input; 736 737 return 0; 738 739 err_free_input: 740 input_free_device(input_dev); 741 lis3->idev = NULL; 742 return err; 743 744 } 745 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable); 746 747 void lis3lv02d_joystick_disable(struct lis3lv02d *lis3) 748 { 749 if (lis3->irq) 750 free_irq(lis3->irq, lis3); 751 if (lis3->pdata && lis3->pdata->irq2) 752 free_irq(lis3->pdata->irq2, lis3); 753 754 if (!lis3->idev) 755 return; 756 757 if (lis3->irq) 758 misc_deregister(&lis3->miscdev); 759 input_unregister_device(lis3->idev); 760 lis3->idev = NULL; 761 } 762 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable); 763 764 /* Sysfs stuff */ 765 static void lis3lv02d_sysfs_poweron(struct lis3lv02d *lis3) 766 { 767 /* 768 * SYSFS functions are fast visitors so put-call 769 * immediately after the get-call. However, keep 770 * chip running for a while and schedule delayed 771 * suspend. This way periodic sysfs calls doesn't 772 * suffer from relatively long power up time. 773 */ 774 775 if (lis3->pm_dev) { 776 pm_runtime_get_sync(lis3->pm_dev); 777 pm_runtime_put_noidle(lis3->pm_dev); 778 pm_schedule_suspend(lis3->pm_dev, LIS3_SYSFS_POWERDOWN_DELAY); 779 } 780 } 781 782 static ssize_t lis3lv02d_selftest_show(struct device *dev, 783 struct device_attribute *attr, char *buf) 784 { 785 struct lis3lv02d *lis3 = dev_get_drvdata(dev); 786 s16 values[3]; 787 788 static const char ok[] = "OK"; 789 static const char fail[] = "FAIL"; 790 static const char irq[] = "FAIL_IRQ"; 791 const char *res; 792 793 lis3lv02d_sysfs_poweron(lis3); 794 switch (lis3lv02d_selftest(lis3, values)) { 795 case SELFTEST_FAIL: 796 res = fail; 797 break; 798 case SELFTEST_IRQ: 799 res = irq; 800 break; 801 case SELFTEST_OK: 802 default: 803 res = ok; 804 break; 805 } 806 return sprintf(buf, "%s %d %d %d\n", res, 807 values[0], values[1], values[2]); 808 } 809 810 static ssize_t lis3lv02d_position_show(struct device *dev, 811 struct device_attribute *attr, char *buf) 812 { 813 struct lis3lv02d *lis3 = dev_get_drvdata(dev); 814 int x, y, z; 815 816 lis3lv02d_sysfs_poweron(lis3); 817 mutex_lock(&lis3->mutex); 818 lis3lv02d_get_xyz(lis3, &x, &y, &z); 819 mutex_unlock(&lis3->mutex); 820 return sprintf(buf, "(%d,%d,%d)\n", x, y, z); 821 } 822 823 static ssize_t lis3lv02d_rate_show(struct device *dev, 824 struct device_attribute *attr, char *buf) 825 { 826 struct lis3lv02d *lis3 = dev_get_drvdata(dev); 827 int odr_idx; 828 829 lis3lv02d_sysfs_poweron(lis3); 830 831 odr_idx = lis3lv02d_get_odr_index(lis3); 832 return sprintf(buf, "%d\n", lis3->odrs[odr_idx]); 833 } 834 835 static ssize_t lis3lv02d_rate_set(struct device *dev, 836 struct device_attribute *attr, const char *buf, 837 size_t count) 838 { 839 struct lis3lv02d *lis3 = dev_get_drvdata(dev); 840 unsigned long rate; 841 int ret; 842 843 ret = kstrtoul(buf, 0, &rate); 844 if (ret) 845 return ret; 846 847 lis3lv02d_sysfs_poweron(lis3); 848 if (lis3lv02d_set_odr(lis3, rate)) 849 return -EINVAL; 850 851 return count; 852 } 853 854 static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL); 855 static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL); 856 static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show, 857 lis3lv02d_rate_set); 858 859 static struct attribute *lis3lv02d_attributes[] = { 860 &dev_attr_selftest.attr, 861 &dev_attr_position.attr, 862 &dev_attr_rate.attr, 863 NULL 864 }; 865 866 static const struct attribute_group lis3lv02d_attribute_group = { 867 .attrs = lis3lv02d_attributes 868 }; 869 870 871 static int lis3lv02d_add_fs(struct lis3lv02d *lis3) 872 { 873 lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0); 874 if (IS_ERR(lis3->pdev)) 875 return PTR_ERR(lis3->pdev); 876 877 platform_set_drvdata(lis3->pdev, lis3); 878 return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group); 879 } 880 881 void lis3lv02d_remove_fs(struct lis3lv02d *lis3) 882 { 883 sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group); 884 platform_device_unregister(lis3->pdev); 885 if (lis3->pm_dev) { 886 /* Barrier after the sysfs remove */ 887 pm_runtime_barrier(lis3->pm_dev); 888 889 /* SYSFS may have left chip running. Turn off if necessary */ 890 if (!pm_runtime_suspended(lis3->pm_dev)) 891 lis3lv02d_poweroff(lis3); 892 893 pm_runtime_disable(lis3->pm_dev); 894 pm_runtime_set_suspended(lis3->pm_dev); 895 } 896 kfree(lis3->reg_cache); 897 } 898 EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs); 899 900 static void lis3lv02d_8b_configure(struct lis3lv02d *lis3, 901 struct lis3lv02d_platform_data *p) 902 { 903 int err; 904 int ctrl2 = p->hipass_ctrl; 905 906 if (p->click_flags) { 907 lis3->write(lis3, CLICK_CFG, p->click_flags); 908 lis3->write(lis3, CLICK_TIMELIMIT, p->click_time_limit); 909 lis3->write(lis3, CLICK_LATENCY, p->click_latency); 910 lis3->write(lis3, CLICK_WINDOW, p->click_window); 911 lis3->write(lis3, CLICK_THSZ, p->click_thresh_z & 0xf); 912 lis3->write(lis3, CLICK_THSY_X, 913 (p->click_thresh_x & 0xf) | 914 (p->click_thresh_y << 4)); 915 916 if (lis3->idev) { 917 input_set_capability(lis3->idev, EV_KEY, BTN_X); 918 input_set_capability(lis3->idev, EV_KEY, BTN_Y); 919 input_set_capability(lis3->idev, EV_KEY, BTN_Z); 920 } 921 } 922 923 if (p->wakeup_flags) { 924 lis3->write(lis3, FF_WU_CFG_1, p->wakeup_flags); 925 lis3->write(lis3, FF_WU_THS_1, p->wakeup_thresh & 0x7f); 926 /* pdata value + 1 to keep this backward compatible*/ 927 lis3->write(lis3, FF_WU_DURATION_1, p->duration1 + 1); 928 ctrl2 ^= HP_FF_WU1; /* Xor to keep compatible with old pdata*/ 929 } 930 931 if (p->wakeup_flags2) { 932 lis3->write(lis3, FF_WU_CFG_2, p->wakeup_flags2); 933 lis3->write(lis3, FF_WU_THS_2, p->wakeup_thresh2 & 0x7f); 934 /* pdata value + 1 to keep this backward compatible*/ 935 lis3->write(lis3, FF_WU_DURATION_2, p->duration2 + 1); 936 ctrl2 ^= HP_FF_WU2; /* Xor to keep compatible with old pdata*/ 937 } 938 /* Configure hipass filters */ 939 lis3->write(lis3, CTRL_REG2, ctrl2); 940 941 if (p->irq2) { 942 err = request_threaded_irq(p->irq2, 943 NULL, 944 lis302dl_interrupt_thread2_8b, 945 IRQF_TRIGGER_RISING | IRQF_ONESHOT | 946 (p->irq_flags2 & IRQF_TRIGGER_MASK), 947 DRIVER_NAME, lis3); 948 if (err < 0) 949 pr_err("No second IRQ. Limited functionality\n"); 950 } 951 } 952 953 #ifdef CONFIG_OF 954 int lis3lv02d_init_dt(struct lis3lv02d *lis3) 955 { 956 struct lis3lv02d_platform_data *pdata; 957 struct device_node *np = lis3->of_node; 958 u32 val; 959 s32 sval; 960 961 if (!lis3->of_node) 962 return 0; 963 964 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); 965 if (!pdata) 966 return -ENOMEM; 967 968 if (of_get_property(np, "st,click-single-x", NULL)) 969 pdata->click_flags |= LIS3_CLICK_SINGLE_X; 970 if (of_get_property(np, "st,click-double-x", NULL)) 971 pdata->click_flags |= LIS3_CLICK_DOUBLE_X; 972 973 if (of_get_property(np, "st,click-single-y", NULL)) 974 pdata->click_flags |= LIS3_CLICK_SINGLE_Y; 975 if (of_get_property(np, "st,click-double-y", NULL)) 976 pdata->click_flags |= LIS3_CLICK_DOUBLE_Y; 977 978 if (of_get_property(np, "st,click-single-z", NULL)) 979 pdata->click_flags |= LIS3_CLICK_SINGLE_Z; 980 if (of_get_property(np, "st,click-double-z", NULL)) 981 pdata->click_flags |= LIS3_CLICK_DOUBLE_Z; 982 983 if (!of_property_read_u32(np, "st,click-threshold-x", &val)) 984 pdata->click_thresh_x = val; 985 if (!of_property_read_u32(np, "st,click-threshold-y", &val)) 986 pdata->click_thresh_y = val; 987 if (!of_property_read_u32(np, "st,click-threshold-z", &val)) 988 pdata->click_thresh_z = val; 989 990 if (!of_property_read_u32(np, "st,click-time-limit", &val)) 991 pdata->click_time_limit = val; 992 if (!of_property_read_u32(np, "st,click-latency", &val)) 993 pdata->click_latency = val; 994 if (!of_property_read_u32(np, "st,click-window", &val)) 995 pdata->click_window = val; 996 997 if (of_get_property(np, "st,irq1-disable", NULL)) 998 pdata->irq_cfg |= LIS3_IRQ1_DISABLE; 999 if (of_get_property(np, "st,irq1-ff-wu-1", NULL)) 1000 pdata->irq_cfg |= LIS3_IRQ1_FF_WU_1; 1001 if (of_get_property(np, "st,irq1-ff-wu-2", NULL)) 1002 pdata->irq_cfg |= LIS3_IRQ1_FF_WU_2; 1003 if (of_get_property(np, "st,irq1-data-ready", NULL)) 1004 pdata->irq_cfg |= LIS3_IRQ1_DATA_READY; 1005 if (of_get_property(np, "st,irq1-click", NULL)) 1006 pdata->irq_cfg |= LIS3_IRQ1_CLICK; 1007 1008 if (of_get_property(np, "st,irq2-disable", NULL)) 1009 pdata->irq_cfg |= LIS3_IRQ2_DISABLE; 1010 if (of_get_property(np, "st,irq2-ff-wu-1", NULL)) 1011 pdata->irq_cfg |= LIS3_IRQ2_FF_WU_1; 1012 if (of_get_property(np, "st,irq2-ff-wu-2", NULL)) 1013 pdata->irq_cfg |= LIS3_IRQ2_FF_WU_2; 1014 if (of_get_property(np, "st,irq2-data-ready", NULL)) 1015 pdata->irq_cfg |= LIS3_IRQ2_DATA_READY; 1016 if (of_get_property(np, "st,irq2-click", NULL)) 1017 pdata->irq_cfg |= LIS3_IRQ2_CLICK; 1018 1019 if (of_get_property(np, "st,irq-open-drain", NULL)) 1020 pdata->irq_cfg |= LIS3_IRQ_OPEN_DRAIN; 1021 if (of_get_property(np, "st,irq-active-low", NULL)) 1022 pdata->irq_cfg |= LIS3_IRQ_ACTIVE_LOW; 1023 1024 if (!of_property_read_u32(np, "st,wu-duration-1", &val)) 1025 pdata->duration1 = val; 1026 if (!of_property_read_u32(np, "st,wu-duration-2", &val)) 1027 pdata->duration2 = val; 1028 1029 if (of_get_property(np, "st,wakeup-x-lo", NULL)) 1030 pdata->wakeup_flags |= LIS3_WAKEUP_X_LO; 1031 if (of_get_property(np, "st,wakeup-x-hi", NULL)) 1032 pdata->wakeup_flags |= LIS3_WAKEUP_X_HI; 1033 if (of_get_property(np, "st,wakeup-y-lo", NULL)) 1034 pdata->wakeup_flags |= LIS3_WAKEUP_Y_LO; 1035 if (of_get_property(np, "st,wakeup-y-hi", NULL)) 1036 pdata->wakeup_flags |= LIS3_WAKEUP_Y_HI; 1037 if (of_get_property(np, "st,wakeup-z-lo", NULL)) 1038 pdata->wakeup_flags |= LIS3_WAKEUP_Z_LO; 1039 if (of_get_property(np, "st,wakeup-z-hi", NULL)) 1040 pdata->wakeup_flags |= LIS3_WAKEUP_Z_HI; 1041 if (of_get_property(np, "st,wakeup-threshold", &val)) 1042 pdata->wakeup_thresh = val; 1043 1044 if (of_get_property(np, "st,wakeup2-x-lo", NULL)) 1045 pdata->wakeup_flags2 |= LIS3_WAKEUP_X_LO; 1046 if (of_get_property(np, "st,wakeup2-x-hi", NULL)) 1047 pdata->wakeup_flags2 |= LIS3_WAKEUP_X_HI; 1048 if (of_get_property(np, "st,wakeup2-y-lo", NULL)) 1049 pdata->wakeup_flags2 |= LIS3_WAKEUP_Y_LO; 1050 if (of_get_property(np, "st,wakeup2-y-hi", NULL)) 1051 pdata->wakeup_flags2 |= LIS3_WAKEUP_Y_HI; 1052 if (of_get_property(np, "st,wakeup2-z-lo", NULL)) 1053 pdata->wakeup_flags2 |= LIS3_WAKEUP_Z_LO; 1054 if (of_get_property(np, "st,wakeup2-z-hi", NULL)) 1055 pdata->wakeup_flags2 |= LIS3_WAKEUP_Z_HI; 1056 if (of_get_property(np, "st,wakeup2-threshold", &val)) 1057 pdata->wakeup_thresh2 = val; 1058 1059 if (!of_property_read_u32(np, "st,highpass-cutoff-hz", &val)) { 1060 switch (val) { 1061 case 1: 1062 pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_1HZ; 1063 break; 1064 case 2: 1065 pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_2HZ; 1066 break; 1067 case 4: 1068 pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_4HZ; 1069 break; 1070 case 8: 1071 pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_8HZ; 1072 break; 1073 } 1074 } 1075 1076 if (of_get_property(np, "st,hipass1-disable", NULL)) 1077 pdata->hipass_ctrl |= LIS3_HIPASS1_DISABLE; 1078 if (of_get_property(np, "st,hipass2-disable", NULL)) 1079 pdata->hipass_ctrl |= LIS3_HIPASS2_DISABLE; 1080 1081 if (of_property_read_s32(np, "st,axis-x", &sval) == 0) 1082 pdata->axis_x = sval; 1083 if (of_property_read_s32(np, "st,axis-y", &sval) == 0) 1084 pdata->axis_y = sval; 1085 if (of_property_read_s32(np, "st,axis-z", &sval) == 0) 1086 pdata->axis_z = sval; 1087 1088 if (of_get_property(np, "st,default-rate", NULL)) 1089 pdata->default_rate = val; 1090 1091 if (of_property_read_s32(np, "st,min-limit-x", &sval) == 0) 1092 pdata->st_min_limits[0] = sval; 1093 if (of_property_read_s32(np, "st,min-limit-y", &sval) == 0) 1094 pdata->st_min_limits[1] = sval; 1095 if (of_property_read_s32(np, "st,min-limit-z", &sval) == 0) 1096 pdata->st_min_limits[2] = sval; 1097 1098 if (of_property_read_s32(np, "st,max-limit-x", &sval) == 0) 1099 pdata->st_max_limits[0] = sval; 1100 if (of_property_read_s32(np, "st,max-limit-y", &sval) == 0) 1101 pdata->st_max_limits[1] = sval; 1102 if (of_property_read_s32(np, "st,max-limit-z", &sval) == 0) 1103 pdata->st_max_limits[2] = sval; 1104 1105 1106 lis3->pdata = pdata; 1107 1108 return 0; 1109 } 1110 1111 #else 1112 int lis3lv02d_init_dt(struct lis3lv02d *lis3) 1113 { 1114 return 0; 1115 } 1116 #endif 1117 EXPORT_SYMBOL_GPL(lis3lv02d_init_dt); 1118 1119 /* 1120 * Initialise the accelerometer and the various subsystems. 1121 * Should be rather independent of the bus system. 1122 */ 1123 int lis3lv02d_init_device(struct lis3lv02d *lis3) 1124 { 1125 int err; 1126 irq_handler_t thread_fn; 1127 int irq_flags = 0; 1128 1129 lis3->whoami = lis3lv02d_read_8(lis3, WHO_AM_I); 1130 1131 switch (lis3->whoami) { 1132 case WAI_12B: 1133 pr_info("12 bits sensor found\n"); 1134 lis3->read_data = lis3lv02d_read_12; 1135 lis3->mdps_max_val = 2048; 1136 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_12B; 1137 lis3->odrs = lis3_12_rates; 1138 lis3->odr_mask = CTRL1_DF0 | CTRL1_DF1; 1139 lis3->scale = LIS3_SENSITIVITY_12B; 1140 lis3->regs = lis3_wai12_regs; 1141 lis3->regs_size = ARRAY_SIZE(lis3_wai12_regs); 1142 break; 1143 case WAI_8B: 1144 pr_info("8 bits sensor found\n"); 1145 lis3->read_data = lis3lv02d_read_8; 1146 lis3->mdps_max_val = 128; 1147 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B; 1148 lis3->odrs = lis3_8_rates; 1149 lis3->odr_mask = CTRL1_DR; 1150 lis3->scale = LIS3_SENSITIVITY_8B; 1151 lis3->regs = lis3_wai8_regs; 1152 lis3->regs_size = ARRAY_SIZE(lis3_wai8_regs); 1153 break; 1154 case WAI_3DC: 1155 pr_info("8 bits 3DC sensor found\n"); 1156 lis3->read_data = lis3lv02d_read_8; 1157 lis3->mdps_max_val = 128; 1158 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B; 1159 lis3->odrs = lis3_3dc_rates; 1160 lis3->odr_mask = CTRL1_ODR0|CTRL1_ODR1|CTRL1_ODR2|CTRL1_ODR3; 1161 lis3->scale = LIS3_SENSITIVITY_8B; 1162 break; 1163 case WAI_3DLH: 1164 pr_info("16 bits lis331dlh sensor found\n"); 1165 lis3->read_data = lis331dlh_read_data; 1166 lis3->mdps_max_val = 2048; /* 12 bits for 2G */ 1167 lis3->shift_adj = SHIFT_ADJ_2G; 1168 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B; 1169 lis3->odrs = lis3_3dlh_rates; 1170 lis3->odr_mask = CTRL1_DR0 | CTRL1_DR1; 1171 lis3->scale = LIS3DLH_SENSITIVITY_2G; 1172 break; 1173 default: 1174 pr_err("unknown sensor type 0x%X\n", lis3->whoami); 1175 return -ENODEV; 1176 } 1177 1178 lis3->reg_cache = kzalloc(max(sizeof(lis3_wai8_regs), 1179 sizeof(lis3_wai12_regs)), GFP_KERNEL); 1180 1181 if (lis3->reg_cache == NULL) 1182 return -ENOMEM; 1183 1184 mutex_init(&lis3->mutex); 1185 atomic_set(&lis3->wake_thread, 0); 1186 1187 lis3lv02d_add_fs(lis3); 1188 err = lis3lv02d_poweron(lis3); 1189 if (err) { 1190 lis3lv02d_remove_fs(lis3); 1191 return err; 1192 } 1193 1194 if (lis3->pm_dev) { 1195 pm_runtime_set_active(lis3->pm_dev); 1196 pm_runtime_enable(lis3->pm_dev); 1197 } 1198 1199 if (lis3lv02d_joystick_enable(lis3)) 1200 pr_err("joystick initialization failed\n"); 1201 1202 /* passing in platform specific data is purely optional and only 1203 * used by the SPI transport layer at the moment */ 1204 if (lis3->pdata) { 1205 struct lis3lv02d_platform_data *p = lis3->pdata; 1206 1207 if (lis3->whoami == WAI_8B) 1208 lis3lv02d_8b_configure(lis3, p); 1209 1210 irq_flags = p->irq_flags1 & IRQF_TRIGGER_MASK; 1211 1212 lis3->irq_cfg = p->irq_cfg; 1213 if (p->irq_cfg) 1214 lis3->write(lis3, CTRL_REG3, p->irq_cfg); 1215 1216 if (p->default_rate) 1217 lis3lv02d_set_odr(lis3, p->default_rate); 1218 } 1219 1220 /* bail if we did not get an IRQ from the bus layer */ 1221 if (!lis3->irq) { 1222 pr_debug("No IRQ. Disabling /dev/freefall\n"); 1223 goto out; 1224 } 1225 1226 /* 1227 * The sensor can generate interrupts for free-fall and direction 1228 * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep 1229 * the things simple and _fast_ we activate it only for free-fall, so 1230 * no need to read register (very slow with ACPI). For the same reason, 1231 * we forbid shared interrupts. 1232 * 1233 * IRQF_TRIGGER_RISING seems pointless on HP laptops because the 1234 * io-apic is not configurable (and generates a warning) but I keep it 1235 * in case of support for other hardware. 1236 */ 1237 if (lis3->pdata && lis3->whoami == WAI_8B) 1238 thread_fn = lis302dl_interrupt_thread1_8b; 1239 else 1240 thread_fn = NULL; 1241 1242 err = request_threaded_irq(lis3->irq, lis302dl_interrupt, 1243 thread_fn, 1244 IRQF_TRIGGER_RISING | IRQF_ONESHOT | 1245 irq_flags, 1246 DRIVER_NAME, lis3); 1247 1248 if (err < 0) { 1249 pr_err("Cannot get IRQ\n"); 1250 goto out; 1251 } 1252 1253 lis3->miscdev.minor = MISC_DYNAMIC_MINOR; 1254 lis3->miscdev.name = "freefall"; 1255 lis3->miscdev.fops = &lis3lv02d_misc_fops; 1256 1257 if (misc_register(&lis3->miscdev)) 1258 pr_err("misc_register failed\n"); 1259 out: 1260 return 0; 1261 } 1262 EXPORT_SYMBOL_GPL(lis3lv02d_init_device); 1263 1264 MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver"); 1265 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek"); 1266 MODULE_LICENSE("GPL"); 1267