1 /* 2 * lis3lv02d.c - ST LIS3LV02DL accelerometer driver 3 * 4 * Copyright (C) 2007-2008 Yan Burman 5 * Copyright (C) 2008 Eric Piel 6 * Copyright (C) 2008-2009 Pavel Machek 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 */ 22 23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 24 25 #include <linux/kernel.h> 26 #include <linux/dmi.h> 27 #include <linux/module.h> 28 #include <linux/types.h> 29 #include <linux/platform_device.h> 30 #include <linux/interrupt.h> 31 #include <linux/input-polldev.h> 32 #include <linux/delay.h> 33 #include <linux/wait.h> 34 #include <linux/poll.h> 35 #include <linux/slab.h> 36 #include <linux/freezer.h> 37 #include <linux/uaccess.h> 38 #include <linux/miscdevice.h> 39 #include <linux/pm_runtime.h> 40 #include <linux/atomic.h> 41 #include <linux/of_device.h> 42 #include "lis3lv02d.h" 43 44 #define DRIVER_NAME "lis3lv02d" 45 46 /* joystick device poll interval in milliseconds */ 47 #define MDPS_POLL_INTERVAL 50 48 #define MDPS_POLL_MIN 0 49 #define MDPS_POLL_MAX 2000 50 51 #define LIS3_SYSFS_POWERDOWN_DELAY 5000 /* In milliseconds */ 52 53 #define SELFTEST_OK 0 54 #define SELFTEST_FAIL -1 55 #define SELFTEST_IRQ -2 56 57 #define IRQ_LINE0 0 58 #define IRQ_LINE1 1 59 60 /* 61 * The sensor can also generate interrupts (DRDY) but it's pretty pointless 62 * because they are generated even if the data do not change. So it's better 63 * to keep the interrupt for the free-fall event. The values are updated at 64 * 40Hz (at the lowest frequency), but as it can be pretty time consuming on 65 * some low processor, we poll the sensor only at 20Hz... enough for the 66 * joystick. 67 */ 68 69 #define LIS3_PWRON_DELAY_WAI_12B (5000) 70 #define LIS3_PWRON_DELAY_WAI_8B (3000) 71 72 /* 73 * LIS3LV02D spec says 1024 LSBs corresponds 1 G -> 1LSB is 1000/1024 mG 74 * LIS302D spec says: 18 mG / digit 75 * LIS3_ACCURACY is used to increase accuracy of the intermediate 76 * calculation results. 77 */ 78 #define LIS3_ACCURACY 1024 79 /* Sensitivity values for -2G +2G scale */ 80 #define LIS3_SENSITIVITY_12B ((LIS3_ACCURACY * 1000) / 1024) 81 #define LIS3_SENSITIVITY_8B (18 * LIS3_ACCURACY) 82 83 /* 84 * LIS331DLH spec says 1LSBs corresponds 4G/4096 -> 1LSB is 1000/1024 mG. 85 * Below macros defines sensitivity values for +/-2G. Dataout bits for 86 * +/-2G range is 12 bits so 4 bits adjustment must be done to get 12bit 87 * data from 16bit value. Currently this driver supports only 2G range. 88 */ 89 #define LIS3DLH_SENSITIVITY_2G ((LIS3_ACCURACY * 1000) / 1024) 90 #define SHIFT_ADJ_2G 4 91 92 #define LIS3_DEFAULT_FUZZ_12B 3 93 #define LIS3_DEFAULT_FLAT_12B 3 94 #define LIS3_DEFAULT_FUZZ_8B 1 95 #define LIS3_DEFAULT_FLAT_8B 1 96 97 struct lis3lv02d lis3_dev = { 98 .misc_wait = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait), 99 }; 100 EXPORT_SYMBOL_GPL(lis3_dev); 101 102 /* just like param_set_int() but does sanity-check so that it won't point 103 * over the axis array size 104 */ 105 static int param_set_axis(const char *val, const struct kernel_param *kp) 106 { 107 int ret = param_set_int(val, kp); 108 if (!ret) { 109 int val = *(int *)kp->arg; 110 if (val < 0) 111 val = -val; 112 if (!val || val > 3) 113 return -EINVAL; 114 } 115 return ret; 116 } 117 118 static struct kernel_param_ops param_ops_axis = { 119 .set = param_set_axis, 120 .get = param_get_int, 121 }; 122 123 #define param_check_axis(name, p) param_check_int(name, p) 124 125 module_param_array_named(axes, lis3_dev.ac.as_array, axis, NULL, 0644); 126 MODULE_PARM_DESC(axes, "Axis-mapping for x,y,z directions"); 127 128 static s16 lis3lv02d_read_8(struct lis3lv02d *lis3, int reg) 129 { 130 s8 lo; 131 if (lis3->read(lis3, reg, &lo) < 0) 132 return 0; 133 134 return lo; 135 } 136 137 static s16 lis3lv02d_read_12(struct lis3lv02d *lis3, int reg) 138 { 139 u8 lo, hi; 140 141 lis3->read(lis3, reg - 1, &lo); 142 lis3->read(lis3, reg, &hi); 143 /* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */ 144 return (s16)((hi << 8) | lo); 145 } 146 147 /* 12bits for 2G range, 13 bits for 4G range and 14 bits for 8G range */ 148 static s16 lis331dlh_read_data(struct lis3lv02d *lis3, int reg) 149 { 150 u8 lo, hi; 151 int v; 152 153 lis3->read(lis3, reg - 1, &lo); 154 lis3->read(lis3, reg, &hi); 155 v = (int) ((hi << 8) | lo); 156 157 return (s16) v >> lis3->shift_adj; 158 } 159 160 /** 161 * lis3lv02d_get_axis - For the given axis, give the value converted 162 * @axis: 1,2,3 - can also be negative 163 * @hw_values: raw values returned by the hardware 164 * 165 * Returns the converted value. 166 */ 167 static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3]) 168 { 169 if (axis > 0) 170 return hw_values[axis - 1]; 171 else 172 return -hw_values[-axis - 1]; 173 } 174 175 /** 176 * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer 177 * @lis3: pointer to the device struct 178 * @x: where to store the X axis value 179 * @y: where to store the Y axis value 180 * @z: where to store the Z axis value 181 * 182 * Note that 40Hz input device can eat up about 10% CPU at 800MHZ 183 */ 184 static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z) 185 { 186 int position[3]; 187 int i; 188 189 if (lis3->blkread) { 190 if (lis3->whoami == WAI_12B) { 191 u16 data[3]; 192 lis3->blkread(lis3, OUTX_L, 6, (u8 *)data); 193 for (i = 0; i < 3; i++) 194 position[i] = (s16)le16_to_cpu(data[i]); 195 } else { 196 u8 data[5]; 197 /* Data: x, dummy, y, dummy, z */ 198 lis3->blkread(lis3, OUTX, 5, data); 199 for (i = 0; i < 3; i++) 200 position[i] = (s8)data[i * 2]; 201 } 202 } else { 203 position[0] = lis3->read_data(lis3, OUTX); 204 position[1] = lis3->read_data(lis3, OUTY); 205 position[2] = lis3->read_data(lis3, OUTZ); 206 } 207 208 for (i = 0; i < 3; i++) 209 position[i] = (position[i] * lis3->scale) / LIS3_ACCURACY; 210 211 *x = lis3lv02d_get_axis(lis3->ac.x, position); 212 *y = lis3lv02d_get_axis(lis3->ac.y, position); 213 *z = lis3lv02d_get_axis(lis3->ac.z, position); 214 } 215 216 /* conversion btw sampling rate and the register values */ 217 static int lis3_12_rates[4] = {40, 160, 640, 2560}; 218 static int lis3_8_rates[2] = {100, 400}; 219 static int lis3_3dc_rates[16] = {0, 1, 10, 25, 50, 100, 200, 400, 1600, 5000}; 220 static int lis3_3dlh_rates[4] = {50, 100, 400, 1000}; 221 222 /* ODR is Output Data Rate */ 223 static int lis3lv02d_get_odr(struct lis3lv02d *lis3) 224 { 225 u8 ctrl; 226 int shift; 227 228 lis3->read(lis3, CTRL_REG1, &ctrl); 229 ctrl &= lis3->odr_mask; 230 shift = ffs(lis3->odr_mask) - 1; 231 return lis3->odrs[(ctrl >> shift)]; 232 } 233 234 static int lis3lv02d_get_pwron_wait(struct lis3lv02d *lis3) 235 { 236 int div = lis3lv02d_get_odr(lis3); 237 238 if (WARN_ONCE(div == 0, "device returned spurious data")) 239 return -ENXIO; 240 241 /* LIS3 power on delay is quite long */ 242 msleep(lis3->pwron_delay / div); 243 return 0; 244 } 245 246 static int lis3lv02d_set_odr(struct lis3lv02d *lis3, int rate) 247 { 248 u8 ctrl; 249 int i, len, shift; 250 251 if (!rate) 252 return -EINVAL; 253 254 lis3->read(lis3, CTRL_REG1, &ctrl); 255 ctrl &= ~lis3->odr_mask; 256 len = 1 << hweight_long(lis3->odr_mask); /* # of possible values */ 257 shift = ffs(lis3->odr_mask) - 1; 258 259 for (i = 0; i < len; i++) 260 if (lis3->odrs[i] == rate) { 261 lis3->write(lis3, CTRL_REG1, 262 ctrl | (i << shift)); 263 return 0; 264 } 265 return -EINVAL; 266 } 267 268 static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3]) 269 { 270 u8 ctlreg, reg; 271 s16 x, y, z; 272 u8 selftest; 273 int ret; 274 u8 ctrl_reg_data; 275 unsigned char irq_cfg; 276 277 mutex_lock(&lis3->mutex); 278 279 irq_cfg = lis3->irq_cfg; 280 if (lis3->whoami == WAI_8B) { 281 lis3->data_ready_count[IRQ_LINE0] = 0; 282 lis3->data_ready_count[IRQ_LINE1] = 0; 283 284 /* Change interrupt cfg to data ready for selftest */ 285 atomic_inc(&lis3->wake_thread); 286 lis3->irq_cfg = LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY; 287 lis3->read(lis3, CTRL_REG3, &ctrl_reg_data); 288 lis3->write(lis3, CTRL_REG3, (ctrl_reg_data & 289 ~(LIS3_IRQ1_MASK | LIS3_IRQ2_MASK)) | 290 (LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY)); 291 } 292 293 if ((lis3->whoami == WAI_3DC) || (lis3->whoami == WAI_3DLH)) { 294 ctlreg = CTRL_REG4; 295 selftest = CTRL4_ST0; 296 } else { 297 ctlreg = CTRL_REG1; 298 if (lis3->whoami == WAI_12B) 299 selftest = CTRL1_ST; 300 else 301 selftest = CTRL1_STP; 302 } 303 304 lis3->read(lis3, ctlreg, ®); 305 lis3->write(lis3, ctlreg, (reg | selftest)); 306 ret = lis3lv02d_get_pwron_wait(lis3); 307 if (ret) 308 goto fail; 309 310 /* Read directly to avoid axis remap */ 311 x = lis3->read_data(lis3, OUTX); 312 y = lis3->read_data(lis3, OUTY); 313 z = lis3->read_data(lis3, OUTZ); 314 315 /* back to normal settings */ 316 lis3->write(lis3, ctlreg, reg); 317 ret = lis3lv02d_get_pwron_wait(lis3); 318 if (ret) 319 goto fail; 320 321 results[0] = x - lis3->read_data(lis3, OUTX); 322 results[1] = y - lis3->read_data(lis3, OUTY); 323 results[2] = z - lis3->read_data(lis3, OUTZ); 324 325 ret = 0; 326 327 if (lis3->whoami == WAI_8B) { 328 /* Restore original interrupt configuration */ 329 atomic_dec(&lis3->wake_thread); 330 lis3->write(lis3, CTRL_REG3, ctrl_reg_data); 331 lis3->irq_cfg = irq_cfg; 332 333 if ((irq_cfg & LIS3_IRQ1_MASK) && 334 lis3->data_ready_count[IRQ_LINE0] < 2) { 335 ret = SELFTEST_IRQ; 336 goto fail; 337 } 338 339 if ((irq_cfg & LIS3_IRQ2_MASK) && 340 lis3->data_ready_count[IRQ_LINE1] < 2) { 341 ret = SELFTEST_IRQ; 342 goto fail; 343 } 344 } 345 346 if (lis3->pdata) { 347 int i; 348 for (i = 0; i < 3; i++) { 349 /* Check against selftest acceptance limits */ 350 if ((results[i] < lis3->pdata->st_min_limits[i]) || 351 (results[i] > lis3->pdata->st_max_limits[i])) { 352 ret = SELFTEST_FAIL; 353 goto fail; 354 } 355 } 356 } 357 358 /* test passed */ 359 fail: 360 mutex_unlock(&lis3->mutex); 361 return ret; 362 } 363 364 /* 365 * Order of registers in the list affects to order of the restore process. 366 * Perhaps it is a good idea to set interrupt enable register as a last one 367 * after all other configurations 368 */ 369 static u8 lis3_wai8_regs[] = { FF_WU_CFG_1, FF_WU_THS_1, FF_WU_DURATION_1, 370 FF_WU_CFG_2, FF_WU_THS_2, FF_WU_DURATION_2, 371 CLICK_CFG, CLICK_SRC, CLICK_THSY_X, CLICK_THSZ, 372 CLICK_TIMELIMIT, CLICK_LATENCY, CLICK_WINDOW, 373 CTRL_REG1, CTRL_REG2, CTRL_REG3}; 374 375 static u8 lis3_wai12_regs[] = {FF_WU_CFG, FF_WU_THS_L, FF_WU_THS_H, 376 FF_WU_DURATION, DD_CFG, DD_THSI_L, DD_THSI_H, 377 DD_THSE_L, DD_THSE_H, 378 CTRL_REG1, CTRL_REG3, CTRL_REG2}; 379 380 static inline void lis3_context_save(struct lis3lv02d *lis3) 381 { 382 int i; 383 for (i = 0; i < lis3->regs_size; i++) 384 lis3->read(lis3, lis3->regs[i], &lis3->reg_cache[i]); 385 lis3->regs_stored = true; 386 } 387 388 static inline void lis3_context_restore(struct lis3lv02d *lis3) 389 { 390 int i; 391 if (lis3->regs_stored) 392 for (i = 0; i < lis3->regs_size; i++) 393 lis3->write(lis3, lis3->regs[i], lis3->reg_cache[i]); 394 } 395 396 void lis3lv02d_poweroff(struct lis3lv02d *lis3) 397 { 398 if (lis3->reg_ctrl) 399 lis3_context_save(lis3); 400 /* disable X,Y,Z axis and power down */ 401 lis3->write(lis3, CTRL_REG1, 0x00); 402 if (lis3->reg_ctrl) 403 lis3->reg_ctrl(lis3, LIS3_REG_OFF); 404 } 405 EXPORT_SYMBOL_GPL(lis3lv02d_poweroff); 406 407 int lis3lv02d_poweron(struct lis3lv02d *lis3) 408 { 409 int err; 410 u8 reg; 411 412 lis3->init(lis3); 413 414 /* 415 * Common configuration 416 * BDU: (12 bits sensors only) LSB and MSB values are not updated until 417 * both have been read. So the value read will always be correct. 418 * Set BOOT bit to refresh factory tuning values. 419 */ 420 if (lis3->pdata) { 421 lis3->read(lis3, CTRL_REG2, ®); 422 if (lis3->whoami == WAI_12B) 423 reg |= CTRL2_BDU | CTRL2_BOOT; 424 else if (lis3->whoami == WAI_3DLH) 425 reg |= CTRL2_BOOT_3DLH; 426 else 427 reg |= CTRL2_BOOT_8B; 428 lis3->write(lis3, CTRL_REG2, reg); 429 430 if (lis3->whoami == WAI_3DLH) { 431 lis3->read(lis3, CTRL_REG4, ®); 432 reg |= CTRL4_BDU; 433 lis3->write(lis3, CTRL_REG4, reg); 434 } 435 } 436 437 err = lis3lv02d_get_pwron_wait(lis3); 438 if (err) 439 return err; 440 441 if (lis3->reg_ctrl) 442 lis3_context_restore(lis3); 443 444 return 0; 445 } 446 EXPORT_SYMBOL_GPL(lis3lv02d_poweron); 447 448 449 static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev) 450 { 451 struct lis3lv02d *lis3 = pidev->private; 452 int x, y, z; 453 454 mutex_lock(&lis3->mutex); 455 lis3lv02d_get_xyz(lis3, &x, &y, &z); 456 input_report_abs(pidev->input, ABS_X, x); 457 input_report_abs(pidev->input, ABS_Y, y); 458 input_report_abs(pidev->input, ABS_Z, z); 459 input_sync(pidev->input); 460 mutex_unlock(&lis3->mutex); 461 } 462 463 static void lis3lv02d_joystick_open(struct input_polled_dev *pidev) 464 { 465 struct lis3lv02d *lis3 = pidev->private; 466 467 if (lis3->pm_dev) 468 pm_runtime_get_sync(lis3->pm_dev); 469 470 if (lis3->pdata && lis3->whoami == WAI_8B && lis3->idev) 471 atomic_set(&lis3->wake_thread, 1); 472 /* 473 * Update coordinates for the case where poll interval is 0 and 474 * the chip in running purely under interrupt control 475 */ 476 lis3lv02d_joystick_poll(pidev); 477 } 478 479 static void lis3lv02d_joystick_close(struct input_polled_dev *pidev) 480 { 481 struct lis3lv02d *lis3 = pidev->private; 482 483 atomic_set(&lis3->wake_thread, 0); 484 if (lis3->pm_dev) 485 pm_runtime_put(lis3->pm_dev); 486 } 487 488 static irqreturn_t lis302dl_interrupt(int irq, void *data) 489 { 490 struct lis3lv02d *lis3 = data; 491 492 if (!test_bit(0, &lis3->misc_opened)) 493 goto out; 494 495 /* 496 * Be careful: on some HP laptops the bios force DD when on battery and 497 * the lid is closed. This leads to interrupts as soon as a little move 498 * is done. 499 */ 500 atomic_inc(&lis3->count); 501 502 wake_up_interruptible(&lis3->misc_wait); 503 kill_fasync(&lis3->async_queue, SIGIO, POLL_IN); 504 out: 505 if (atomic_read(&lis3->wake_thread)) 506 return IRQ_WAKE_THREAD; 507 return IRQ_HANDLED; 508 } 509 510 static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3) 511 { 512 struct input_dev *dev = lis3->idev->input; 513 u8 click_src; 514 515 mutex_lock(&lis3->mutex); 516 lis3->read(lis3, CLICK_SRC, &click_src); 517 518 if (click_src & CLICK_SINGLE_X) { 519 input_report_key(dev, lis3->mapped_btns[0], 1); 520 input_report_key(dev, lis3->mapped_btns[0], 0); 521 } 522 523 if (click_src & CLICK_SINGLE_Y) { 524 input_report_key(dev, lis3->mapped_btns[1], 1); 525 input_report_key(dev, lis3->mapped_btns[1], 0); 526 } 527 528 if (click_src & CLICK_SINGLE_Z) { 529 input_report_key(dev, lis3->mapped_btns[2], 1); 530 input_report_key(dev, lis3->mapped_btns[2], 0); 531 } 532 input_sync(dev); 533 mutex_unlock(&lis3->mutex); 534 } 535 536 static inline void lis302dl_data_ready(struct lis3lv02d *lis3, int index) 537 { 538 int dummy; 539 540 /* Dummy read to ack interrupt */ 541 lis3lv02d_get_xyz(lis3, &dummy, &dummy, &dummy); 542 lis3->data_ready_count[index]++; 543 } 544 545 static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data) 546 { 547 struct lis3lv02d *lis3 = data; 548 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ1_MASK; 549 550 if (irq_cfg == LIS3_IRQ1_CLICK) 551 lis302dl_interrupt_handle_click(lis3); 552 else if (unlikely(irq_cfg == LIS3_IRQ1_DATA_READY)) 553 lis302dl_data_ready(lis3, IRQ_LINE0); 554 else 555 lis3lv02d_joystick_poll(lis3->idev); 556 557 return IRQ_HANDLED; 558 } 559 560 static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data) 561 { 562 struct lis3lv02d *lis3 = data; 563 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ2_MASK; 564 565 if (irq_cfg == LIS3_IRQ2_CLICK) 566 lis302dl_interrupt_handle_click(lis3); 567 else if (unlikely(irq_cfg == LIS3_IRQ2_DATA_READY)) 568 lis302dl_data_ready(lis3, IRQ_LINE1); 569 else 570 lis3lv02d_joystick_poll(lis3->idev); 571 572 return IRQ_HANDLED; 573 } 574 575 static int lis3lv02d_misc_open(struct inode *inode, struct file *file) 576 { 577 struct lis3lv02d *lis3 = container_of(file->private_data, 578 struct lis3lv02d, miscdev); 579 580 if (test_and_set_bit(0, &lis3->misc_opened)) 581 return -EBUSY; /* already open */ 582 583 if (lis3->pm_dev) 584 pm_runtime_get_sync(lis3->pm_dev); 585 586 atomic_set(&lis3->count, 0); 587 return 0; 588 } 589 590 static int lis3lv02d_misc_release(struct inode *inode, struct file *file) 591 { 592 struct lis3lv02d *lis3 = container_of(file->private_data, 593 struct lis3lv02d, miscdev); 594 595 clear_bit(0, &lis3->misc_opened); /* release the device */ 596 if (lis3->pm_dev) 597 pm_runtime_put(lis3->pm_dev); 598 return 0; 599 } 600 601 static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf, 602 size_t count, loff_t *pos) 603 { 604 struct lis3lv02d *lis3 = container_of(file->private_data, 605 struct lis3lv02d, miscdev); 606 607 DECLARE_WAITQUEUE(wait, current); 608 u32 data; 609 unsigned char byte_data; 610 ssize_t retval = 1; 611 612 if (count < 1) 613 return -EINVAL; 614 615 add_wait_queue(&lis3->misc_wait, &wait); 616 while (true) { 617 set_current_state(TASK_INTERRUPTIBLE); 618 data = atomic_xchg(&lis3->count, 0); 619 if (data) 620 break; 621 622 if (file->f_flags & O_NONBLOCK) { 623 retval = -EAGAIN; 624 goto out; 625 } 626 627 if (signal_pending(current)) { 628 retval = -ERESTARTSYS; 629 goto out; 630 } 631 632 schedule(); 633 } 634 635 if (data < 255) 636 byte_data = data; 637 else 638 byte_data = 255; 639 640 /* make sure we are not going into copy_to_user() with 641 * TASK_INTERRUPTIBLE state */ 642 set_current_state(TASK_RUNNING); 643 if (copy_to_user(buf, &byte_data, sizeof(byte_data))) 644 retval = -EFAULT; 645 646 out: 647 __set_current_state(TASK_RUNNING); 648 remove_wait_queue(&lis3->misc_wait, &wait); 649 650 return retval; 651 } 652 653 static unsigned int lis3lv02d_misc_poll(struct file *file, poll_table *wait) 654 { 655 struct lis3lv02d *lis3 = container_of(file->private_data, 656 struct lis3lv02d, miscdev); 657 658 poll_wait(file, &lis3->misc_wait, wait); 659 if (atomic_read(&lis3->count)) 660 return POLLIN | POLLRDNORM; 661 return 0; 662 } 663 664 static int lis3lv02d_misc_fasync(int fd, struct file *file, int on) 665 { 666 struct lis3lv02d *lis3 = container_of(file->private_data, 667 struct lis3lv02d, miscdev); 668 669 return fasync_helper(fd, file, on, &lis3->async_queue); 670 } 671 672 static const struct file_operations lis3lv02d_misc_fops = { 673 .owner = THIS_MODULE, 674 .llseek = no_llseek, 675 .read = lis3lv02d_misc_read, 676 .open = lis3lv02d_misc_open, 677 .release = lis3lv02d_misc_release, 678 .poll = lis3lv02d_misc_poll, 679 .fasync = lis3lv02d_misc_fasync, 680 }; 681 682 int lis3lv02d_joystick_enable(struct lis3lv02d *lis3) 683 { 684 struct input_dev *input_dev; 685 int err; 686 int max_val, fuzz, flat; 687 int btns[] = {BTN_X, BTN_Y, BTN_Z}; 688 689 if (lis3->idev) 690 return -EINVAL; 691 692 lis3->idev = input_allocate_polled_device(); 693 if (!lis3->idev) 694 return -ENOMEM; 695 696 lis3->idev->poll = lis3lv02d_joystick_poll; 697 lis3->idev->open = lis3lv02d_joystick_open; 698 lis3->idev->close = lis3lv02d_joystick_close; 699 lis3->idev->poll_interval = MDPS_POLL_INTERVAL; 700 lis3->idev->poll_interval_min = MDPS_POLL_MIN; 701 lis3->idev->poll_interval_max = MDPS_POLL_MAX; 702 lis3->idev->private = lis3; 703 input_dev = lis3->idev->input; 704 705 input_dev->name = "ST LIS3LV02DL Accelerometer"; 706 input_dev->phys = DRIVER_NAME "/input0"; 707 input_dev->id.bustype = BUS_HOST; 708 input_dev->id.vendor = 0; 709 input_dev->dev.parent = &lis3->pdev->dev; 710 711 set_bit(EV_ABS, input_dev->evbit); 712 max_val = (lis3->mdps_max_val * lis3->scale) / LIS3_ACCURACY; 713 if (lis3->whoami == WAI_12B) { 714 fuzz = LIS3_DEFAULT_FUZZ_12B; 715 flat = LIS3_DEFAULT_FLAT_12B; 716 } else { 717 fuzz = LIS3_DEFAULT_FUZZ_8B; 718 flat = LIS3_DEFAULT_FLAT_8B; 719 } 720 fuzz = (fuzz * lis3->scale) / LIS3_ACCURACY; 721 flat = (flat * lis3->scale) / LIS3_ACCURACY; 722 723 input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat); 724 input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat); 725 input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat); 726 727 lis3->mapped_btns[0] = lis3lv02d_get_axis(abs(lis3->ac.x), btns); 728 lis3->mapped_btns[1] = lis3lv02d_get_axis(abs(lis3->ac.y), btns); 729 lis3->mapped_btns[2] = lis3lv02d_get_axis(abs(lis3->ac.z), btns); 730 731 err = input_register_polled_device(lis3->idev); 732 if (err) { 733 input_free_polled_device(lis3->idev); 734 lis3->idev = NULL; 735 } 736 737 return err; 738 } 739 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable); 740 741 void lis3lv02d_joystick_disable(struct lis3lv02d *lis3) 742 { 743 if (lis3->irq) 744 free_irq(lis3->irq, lis3); 745 if (lis3->pdata && lis3->pdata->irq2) 746 free_irq(lis3->pdata->irq2, lis3); 747 748 if (!lis3->idev) 749 return; 750 751 if (lis3->irq) 752 misc_deregister(&lis3->miscdev); 753 input_unregister_polled_device(lis3->idev); 754 input_free_polled_device(lis3->idev); 755 lis3->idev = NULL; 756 } 757 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable); 758 759 /* Sysfs stuff */ 760 static void lis3lv02d_sysfs_poweron(struct lis3lv02d *lis3) 761 { 762 /* 763 * SYSFS functions are fast visitors so put-call 764 * immediately after the get-call. However, keep 765 * chip running for a while and schedule delayed 766 * suspend. This way periodic sysfs calls doesn't 767 * suffer from relatively long power up time. 768 */ 769 770 if (lis3->pm_dev) { 771 pm_runtime_get_sync(lis3->pm_dev); 772 pm_runtime_put_noidle(lis3->pm_dev); 773 pm_schedule_suspend(lis3->pm_dev, LIS3_SYSFS_POWERDOWN_DELAY); 774 } 775 } 776 777 static ssize_t lis3lv02d_selftest_show(struct device *dev, 778 struct device_attribute *attr, char *buf) 779 { 780 struct lis3lv02d *lis3 = dev_get_drvdata(dev); 781 s16 values[3]; 782 783 static const char ok[] = "OK"; 784 static const char fail[] = "FAIL"; 785 static const char irq[] = "FAIL_IRQ"; 786 const char *res; 787 788 lis3lv02d_sysfs_poweron(lis3); 789 switch (lis3lv02d_selftest(lis3, values)) { 790 case SELFTEST_FAIL: 791 res = fail; 792 break; 793 case SELFTEST_IRQ: 794 res = irq; 795 break; 796 case SELFTEST_OK: 797 default: 798 res = ok; 799 break; 800 } 801 return sprintf(buf, "%s %d %d %d\n", res, 802 values[0], values[1], values[2]); 803 } 804 805 static ssize_t lis3lv02d_position_show(struct device *dev, 806 struct device_attribute *attr, char *buf) 807 { 808 struct lis3lv02d *lis3 = dev_get_drvdata(dev); 809 int x, y, z; 810 811 lis3lv02d_sysfs_poweron(lis3); 812 mutex_lock(&lis3->mutex); 813 lis3lv02d_get_xyz(lis3, &x, &y, &z); 814 mutex_unlock(&lis3->mutex); 815 return sprintf(buf, "(%d,%d,%d)\n", x, y, z); 816 } 817 818 static ssize_t lis3lv02d_rate_show(struct device *dev, 819 struct device_attribute *attr, char *buf) 820 { 821 struct lis3lv02d *lis3 = dev_get_drvdata(dev); 822 823 lis3lv02d_sysfs_poweron(lis3); 824 return sprintf(buf, "%d\n", lis3lv02d_get_odr(lis3)); 825 } 826 827 static ssize_t lis3lv02d_rate_set(struct device *dev, 828 struct device_attribute *attr, const char *buf, 829 size_t count) 830 { 831 struct lis3lv02d *lis3 = dev_get_drvdata(dev); 832 unsigned long rate; 833 int ret; 834 835 ret = kstrtoul(buf, 0, &rate); 836 if (ret) 837 return ret; 838 839 lis3lv02d_sysfs_poweron(lis3); 840 if (lis3lv02d_set_odr(lis3, rate)) 841 return -EINVAL; 842 843 return count; 844 } 845 846 static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL); 847 static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL); 848 static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show, 849 lis3lv02d_rate_set); 850 851 static struct attribute *lis3lv02d_attributes[] = { 852 &dev_attr_selftest.attr, 853 &dev_attr_position.attr, 854 &dev_attr_rate.attr, 855 NULL 856 }; 857 858 static struct attribute_group lis3lv02d_attribute_group = { 859 .attrs = lis3lv02d_attributes 860 }; 861 862 863 static int lis3lv02d_add_fs(struct lis3lv02d *lis3) 864 { 865 lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0); 866 if (IS_ERR(lis3->pdev)) 867 return PTR_ERR(lis3->pdev); 868 869 platform_set_drvdata(lis3->pdev, lis3); 870 return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group); 871 } 872 873 int lis3lv02d_remove_fs(struct lis3lv02d *lis3) 874 { 875 sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group); 876 platform_device_unregister(lis3->pdev); 877 if (lis3->pm_dev) { 878 /* Barrier after the sysfs remove */ 879 pm_runtime_barrier(lis3->pm_dev); 880 881 /* SYSFS may have left chip running. Turn off if necessary */ 882 if (!pm_runtime_suspended(lis3->pm_dev)) 883 lis3lv02d_poweroff(lis3); 884 885 pm_runtime_disable(lis3->pm_dev); 886 pm_runtime_set_suspended(lis3->pm_dev); 887 } 888 kfree(lis3->reg_cache); 889 return 0; 890 } 891 EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs); 892 893 static void lis3lv02d_8b_configure(struct lis3lv02d *lis3, 894 struct lis3lv02d_platform_data *p) 895 { 896 int err; 897 int ctrl2 = p->hipass_ctrl; 898 899 if (p->click_flags) { 900 lis3->write(lis3, CLICK_CFG, p->click_flags); 901 lis3->write(lis3, CLICK_TIMELIMIT, p->click_time_limit); 902 lis3->write(lis3, CLICK_LATENCY, p->click_latency); 903 lis3->write(lis3, CLICK_WINDOW, p->click_window); 904 lis3->write(lis3, CLICK_THSZ, p->click_thresh_z & 0xf); 905 lis3->write(lis3, CLICK_THSY_X, 906 (p->click_thresh_x & 0xf) | 907 (p->click_thresh_y << 4)); 908 909 if (lis3->idev) { 910 struct input_dev *input_dev = lis3->idev->input; 911 input_set_capability(input_dev, EV_KEY, BTN_X); 912 input_set_capability(input_dev, EV_KEY, BTN_Y); 913 input_set_capability(input_dev, EV_KEY, BTN_Z); 914 } 915 } 916 917 if (p->wakeup_flags) { 918 lis3->write(lis3, FF_WU_CFG_1, p->wakeup_flags); 919 lis3->write(lis3, FF_WU_THS_1, p->wakeup_thresh & 0x7f); 920 /* pdata value + 1 to keep this backward compatible*/ 921 lis3->write(lis3, FF_WU_DURATION_1, p->duration1 + 1); 922 ctrl2 ^= HP_FF_WU1; /* Xor to keep compatible with old pdata*/ 923 } 924 925 if (p->wakeup_flags2) { 926 lis3->write(lis3, FF_WU_CFG_2, p->wakeup_flags2); 927 lis3->write(lis3, FF_WU_THS_2, p->wakeup_thresh2 & 0x7f); 928 /* pdata value + 1 to keep this backward compatible*/ 929 lis3->write(lis3, FF_WU_DURATION_2, p->duration2 + 1); 930 ctrl2 ^= HP_FF_WU2; /* Xor to keep compatible with old pdata*/ 931 } 932 /* Configure hipass filters */ 933 lis3->write(lis3, CTRL_REG2, ctrl2); 934 935 if (p->irq2) { 936 err = request_threaded_irq(p->irq2, 937 NULL, 938 lis302dl_interrupt_thread2_8b, 939 IRQF_TRIGGER_RISING | IRQF_ONESHOT | 940 (p->irq_flags2 & IRQF_TRIGGER_MASK), 941 DRIVER_NAME, lis3); 942 if (err < 0) 943 pr_err("No second IRQ. Limited functionality\n"); 944 } 945 } 946 947 #ifdef CONFIG_OF 948 int lis3lv02d_init_dt(struct lis3lv02d *lis3) 949 { 950 struct lis3lv02d_platform_data *pdata; 951 struct device_node *np = lis3->of_node; 952 u32 val; 953 954 if (!lis3->of_node) 955 return 0; 956 957 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); 958 if (!pdata) 959 return -ENOMEM; 960 961 if (of_get_property(np, "st,click-single-x", NULL)) 962 pdata->click_flags |= LIS3_CLICK_SINGLE_X; 963 if (of_get_property(np, "st,click-double-x", NULL)) 964 pdata->click_flags |= LIS3_CLICK_DOUBLE_X; 965 966 if (of_get_property(np, "st,click-single-y", NULL)) 967 pdata->click_flags |= LIS3_CLICK_SINGLE_Y; 968 if (of_get_property(np, "st,click-double-y", NULL)) 969 pdata->click_flags |= LIS3_CLICK_DOUBLE_Y; 970 971 if (of_get_property(np, "st,click-single-z", NULL)) 972 pdata->click_flags |= LIS3_CLICK_SINGLE_Z; 973 if (of_get_property(np, "st,click-double-z", NULL)) 974 pdata->click_flags |= LIS3_CLICK_DOUBLE_Z; 975 976 if (!of_property_read_u32(np, "st,click-threshold-x", &val)) 977 pdata->click_thresh_x = val; 978 if (!of_property_read_u32(np, "st,click-threshold-y", &val)) 979 pdata->click_thresh_y = val; 980 if (!of_property_read_u32(np, "st,click-threshold-z", &val)) 981 pdata->click_thresh_z = val; 982 983 if (!of_property_read_u32(np, "st,click-time-limit", &val)) 984 pdata->click_time_limit = val; 985 if (!of_property_read_u32(np, "st,click-latency", &val)) 986 pdata->click_latency = val; 987 if (!of_property_read_u32(np, "st,click-window", &val)) 988 pdata->click_window = val; 989 990 if (of_get_property(np, "st,irq1-disable", NULL)) 991 pdata->irq_cfg |= LIS3_IRQ1_DISABLE; 992 if (of_get_property(np, "st,irq1-ff-wu-1", NULL)) 993 pdata->irq_cfg |= LIS3_IRQ1_FF_WU_1; 994 if (of_get_property(np, "st,irq1-ff-wu-2", NULL)) 995 pdata->irq_cfg |= LIS3_IRQ1_FF_WU_2; 996 if (of_get_property(np, "st,irq1-data-ready", NULL)) 997 pdata->irq_cfg |= LIS3_IRQ1_DATA_READY; 998 if (of_get_property(np, "st,irq1-click", NULL)) 999 pdata->irq_cfg |= LIS3_IRQ1_CLICK; 1000 1001 if (of_get_property(np, "st,irq2-disable", NULL)) 1002 pdata->irq_cfg |= LIS3_IRQ2_DISABLE; 1003 if (of_get_property(np, "st,irq2-ff-wu-1", NULL)) 1004 pdata->irq_cfg |= LIS3_IRQ2_FF_WU_1; 1005 if (of_get_property(np, "st,irq2-ff-wu-2", NULL)) 1006 pdata->irq_cfg |= LIS3_IRQ2_FF_WU_2; 1007 if (of_get_property(np, "st,irq2-data-ready", NULL)) 1008 pdata->irq_cfg |= LIS3_IRQ2_DATA_READY; 1009 if (of_get_property(np, "st,irq2-click", NULL)) 1010 pdata->irq_cfg |= LIS3_IRQ2_CLICK; 1011 1012 if (of_get_property(np, "st,irq-open-drain", NULL)) 1013 pdata->irq_cfg |= LIS3_IRQ_OPEN_DRAIN; 1014 if (of_get_property(np, "st,irq-active-low", NULL)) 1015 pdata->irq_cfg |= LIS3_IRQ_ACTIVE_LOW; 1016 1017 if (!of_property_read_u32(np, "st,wu-duration-1", &val)) 1018 pdata->duration1 = val; 1019 if (!of_property_read_u32(np, "st,wu-duration-2", &val)) 1020 pdata->duration2 = val; 1021 1022 if (of_get_property(np, "st,wakeup-x-lo", NULL)) 1023 pdata->wakeup_flags |= LIS3_WAKEUP_X_LO; 1024 if (of_get_property(np, "st,wakeup-x-hi", NULL)) 1025 pdata->wakeup_flags |= LIS3_WAKEUP_X_HI; 1026 if (of_get_property(np, "st,wakeup-y-lo", NULL)) 1027 pdata->wakeup_flags |= LIS3_WAKEUP_Y_LO; 1028 if (of_get_property(np, "st,wakeup-y-hi", NULL)) 1029 pdata->wakeup_flags |= LIS3_WAKEUP_Y_HI; 1030 if (of_get_property(np, "st,wakeup-z-lo", NULL)) 1031 pdata->wakeup_flags |= LIS3_WAKEUP_Z_LO; 1032 if (of_get_property(np, "st,wakeup-z-hi", NULL)) 1033 pdata->wakeup_flags |= LIS3_WAKEUP_Z_HI; 1034 1035 if (!of_property_read_u32(np, "st,highpass-cutoff-hz", &val)) { 1036 switch (val) { 1037 case 1: 1038 pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_1HZ; 1039 break; 1040 case 2: 1041 pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_2HZ; 1042 break; 1043 case 4: 1044 pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_4HZ; 1045 break; 1046 case 8: 1047 pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_8HZ; 1048 break; 1049 } 1050 } 1051 1052 if (of_get_property(np, "st,hipass1-disable", NULL)) 1053 pdata->hipass_ctrl |= LIS3_HIPASS1_DISABLE; 1054 if (of_get_property(np, "st,hipass2-disable", NULL)) 1055 pdata->hipass_ctrl |= LIS3_HIPASS2_DISABLE; 1056 1057 if (of_get_property(np, "st,axis-x", &val)) 1058 pdata->axis_x = val; 1059 if (of_get_property(np, "st,axis-y", &val)) 1060 pdata->axis_y = val; 1061 if (of_get_property(np, "st,axis-z", &val)) 1062 pdata->axis_z = val; 1063 1064 if (of_get_property(np, "st,default-rate", NULL)) 1065 pdata->default_rate = val; 1066 1067 if (of_get_property(np, "st,min-limit-x", &val)) 1068 pdata->st_min_limits[0] = val; 1069 if (of_get_property(np, "st,min-limit-y", &val)) 1070 pdata->st_min_limits[1] = val; 1071 if (of_get_property(np, "st,min-limit-z", &val)) 1072 pdata->st_min_limits[2] = val; 1073 1074 if (of_get_property(np, "st,max-limit-x", &val)) 1075 pdata->st_max_limits[0] = val; 1076 if (of_get_property(np, "st,max-limit-y", &val)) 1077 pdata->st_max_limits[1] = val; 1078 if (of_get_property(np, "st,max-limit-z", &val)) 1079 pdata->st_max_limits[2] = val; 1080 1081 1082 lis3->pdata = pdata; 1083 1084 return 0; 1085 } 1086 1087 #else 1088 int lis3lv02d_init_dt(struct lis3lv02d *lis3) 1089 { 1090 return 0; 1091 } 1092 #endif 1093 EXPORT_SYMBOL_GPL(lis3lv02d_init_dt); 1094 1095 /* 1096 * Initialise the accelerometer and the various subsystems. 1097 * Should be rather independent of the bus system. 1098 */ 1099 int lis3lv02d_init_device(struct lis3lv02d *lis3) 1100 { 1101 int err; 1102 irq_handler_t thread_fn; 1103 int irq_flags = 0; 1104 1105 lis3->whoami = lis3lv02d_read_8(lis3, WHO_AM_I); 1106 1107 switch (lis3->whoami) { 1108 case WAI_12B: 1109 pr_info("12 bits sensor found\n"); 1110 lis3->read_data = lis3lv02d_read_12; 1111 lis3->mdps_max_val = 2048; 1112 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_12B; 1113 lis3->odrs = lis3_12_rates; 1114 lis3->odr_mask = CTRL1_DF0 | CTRL1_DF1; 1115 lis3->scale = LIS3_SENSITIVITY_12B; 1116 lis3->regs = lis3_wai12_regs; 1117 lis3->regs_size = ARRAY_SIZE(lis3_wai12_regs); 1118 break; 1119 case WAI_8B: 1120 pr_info("8 bits sensor found\n"); 1121 lis3->read_data = lis3lv02d_read_8; 1122 lis3->mdps_max_val = 128; 1123 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B; 1124 lis3->odrs = lis3_8_rates; 1125 lis3->odr_mask = CTRL1_DR; 1126 lis3->scale = LIS3_SENSITIVITY_8B; 1127 lis3->regs = lis3_wai8_regs; 1128 lis3->regs_size = ARRAY_SIZE(lis3_wai8_regs); 1129 break; 1130 case WAI_3DC: 1131 pr_info("8 bits 3DC sensor found\n"); 1132 lis3->read_data = lis3lv02d_read_8; 1133 lis3->mdps_max_val = 128; 1134 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B; 1135 lis3->odrs = lis3_3dc_rates; 1136 lis3->odr_mask = CTRL1_ODR0|CTRL1_ODR1|CTRL1_ODR2|CTRL1_ODR3; 1137 lis3->scale = LIS3_SENSITIVITY_8B; 1138 break; 1139 case WAI_3DLH: 1140 pr_info("16 bits lis331dlh sensor found\n"); 1141 lis3->read_data = lis331dlh_read_data; 1142 lis3->mdps_max_val = 2048; /* 12 bits for 2G */ 1143 lis3->shift_adj = SHIFT_ADJ_2G; 1144 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B; 1145 lis3->odrs = lis3_3dlh_rates; 1146 lis3->odr_mask = CTRL1_DR0 | CTRL1_DR1; 1147 lis3->scale = LIS3DLH_SENSITIVITY_2G; 1148 break; 1149 default: 1150 pr_err("unknown sensor type 0x%X\n", lis3->whoami); 1151 return -EINVAL; 1152 } 1153 1154 lis3->reg_cache = kzalloc(max(sizeof(lis3_wai8_regs), 1155 sizeof(lis3_wai12_regs)), GFP_KERNEL); 1156 1157 if (lis3->reg_cache == NULL) { 1158 printk(KERN_ERR DRIVER_NAME "out of memory\n"); 1159 return -ENOMEM; 1160 } 1161 1162 mutex_init(&lis3->mutex); 1163 atomic_set(&lis3->wake_thread, 0); 1164 1165 lis3lv02d_add_fs(lis3); 1166 err = lis3lv02d_poweron(lis3); 1167 if (err) { 1168 lis3lv02d_remove_fs(lis3); 1169 return err; 1170 } 1171 1172 if (lis3->pm_dev) { 1173 pm_runtime_set_active(lis3->pm_dev); 1174 pm_runtime_enable(lis3->pm_dev); 1175 } 1176 1177 if (lis3lv02d_joystick_enable(lis3)) 1178 pr_err("joystick initialization failed\n"); 1179 1180 /* passing in platform specific data is purely optional and only 1181 * used by the SPI transport layer at the moment */ 1182 if (lis3->pdata) { 1183 struct lis3lv02d_platform_data *p = lis3->pdata; 1184 1185 if (lis3->whoami == WAI_8B) 1186 lis3lv02d_8b_configure(lis3, p); 1187 1188 irq_flags = p->irq_flags1 & IRQF_TRIGGER_MASK; 1189 1190 lis3->irq_cfg = p->irq_cfg; 1191 if (p->irq_cfg) 1192 lis3->write(lis3, CTRL_REG3, p->irq_cfg); 1193 1194 if (p->default_rate) 1195 lis3lv02d_set_odr(lis3, p->default_rate); 1196 } 1197 1198 /* bail if we did not get an IRQ from the bus layer */ 1199 if (!lis3->irq) { 1200 pr_debug("No IRQ. Disabling /dev/freefall\n"); 1201 goto out; 1202 } 1203 1204 /* 1205 * The sensor can generate interrupts for free-fall and direction 1206 * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep 1207 * the things simple and _fast_ we activate it only for free-fall, so 1208 * no need to read register (very slow with ACPI). For the same reason, 1209 * we forbid shared interrupts. 1210 * 1211 * IRQF_TRIGGER_RISING seems pointless on HP laptops because the 1212 * io-apic is not configurable (and generates a warning) but I keep it 1213 * in case of support for other hardware. 1214 */ 1215 if (lis3->pdata && lis3->whoami == WAI_8B) 1216 thread_fn = lis302dl_interrupt_thread1_8b; 1217 else 1218 thread_fn = NULL; 1219 1220 err = request_threaded_irq(lis3->irq, lis302dl_interrupt, 1221 thread_fn, 1222 IRQF_TRIGGER_RISING | IRQF_ONESHOT | 1223 irq_flags, 1224 DRIVER_NAME, lis3); 1225 1226 if (err < 0) { 1227 pr_err("Cannot get IRQ\n"); 1228 goto out; 1229 } 1230 1231 lis3->miscdev.minor = MISC_DYNAMIC_MINOR; 1232 lis3->miscdev.name = "freefall"; 1233 lis3->miscdev.fops = &lis3lv02d_misc_fops; 1234 1235 if (misc_register(&lis3->miscdev)) 1236 pr_err("misc_register failed\n"); 1237 out: 1238 return 0; 1239 } 1240 EXPORT_SYMBOL_GPL(lis3lv02d_init_device); 1241 1242 MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver"); 1243 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek"); 1244 MODULE_LICENSE("GPL"); 1245