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/init.h> 27 #include <linux/dmi.h> 28 #include <linux/module.h> 29 #include <linux/types.h> 30 #include <linux/platform_device.h> 31 #include <linux/interrupt.h> 32 #include <linux/input-polldev.h> 33 #include <linux/delay.h> 34 #include <linux/wait.h> 35 #include <linux/poll.h> 36 #include <linux/slab.h> 37 #include <linux/freezer.h> 38 #include <linux/uaccess.h> 39 #include <linux/miscdevice.h> 40 #include <linux/pm_runtime.h> 41 #include <linux/atomic.h> 42 #include <linux/of_device.h> 43 #include "lis3lv02d.h" 44 45 #define DRIVER_NAME "lis3lv02d" 46 47 /* joystick device poll interval in milliseconds */ 48 #define MDPS_POLL_INTERVAL 50 49 #define MDPS_POLL_MIN 0 50 #define MDPS_POLL_MAX 2000 51 52 #define LIS3_SYSFS_POWERDOWN_DELAY 5000 /* In milliseconds */ 53 54 #define SELFTEST_OK 0 55 #define SELFTEST_FAIL -1 56 #define SELFTEST_IRQ -2 57 58 #define IRQ_LINE0 0 59 #define IRQ_LINE1 1 60 61 /* 62 * The sensor can also generate interrupts (DRDY) but it's pretty pointless 63 * because they are generated even if the data do not change. So it's better 64 * to keep the interrupt for the free-fall event. The values are updated at 65 * 40Hz (at the lowest frequency), but as it can be pretty time consuming on 66 * some low processor, we poll the sensor only at 20Hz... enough for the 67 * joystick. 68 */ 69 70 #define LIS3_PWRON_DELAY_WAI_12B (5000) 71 #define LIS3_PWRON_DELAY_WAI_8B (3000) 72 73 /* 74 * LIS3LV02D spec says 1024 LSBs corresponds 1 G -> 1LSB is 1000/1024 mG 75 * LIS302D spec says: 18 mG / digit 76 * LIS3_ACCURACY is used to increase accuracy of the intermediate 77 * calculation results. 78 */ 79 #define LIS3_ACCURACY 1024 80 /* Sensitivity values for -2G +2G scale */ 81 #define LIS3_SENSITIVITY_12B ((LIS3_ACCURACY * 1000) / 1024) 82 #define LIS3_SENSITIVITY_8B (18 * LIS3_ACCURACY) 83 84 /* 85 * LIS331DLH spec says 1LSBs corresponds 4G/4096 -> 1LSB is 1000/1024 mG. 86 * Below macros defines sensitivity values for +/-2G. Dataout bits for 87 * +/-2G range is 12 bits so 4 bits adjustment must be done to get 12bit 88 * data from 16bit value. Currently this driver supports only 2G range. 89 */ 90 #define LIS3DLH_SENSITIVITY_2G ((LIS3_ACCURACY * 1000) / 1024) 91 #define SHIFT_ADJ_2G 4 92 93 #define LIS3_DEFAULT_FUZZ_12B 3 94 #define LIS3_DEFAULT_FLAT_12B 3 95 #define LIS3_DEFAULT_FUZZ_8B 1 96 #define LIS3_DEFAULT_FLAT_8B 1 97 98 struct lis3lv02d lis3_dev = { 99 .misc_wait = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait), 100 }; 101 EXPORT_SYMBOL_GPL(lis3_dev); 102 103 /* just like param_set_int() but does sanity-check so that it won't point 104 * over the axis array size 105 */ 106 static int param_set_axis(const char *val, const struct kernel_param *kp) 107 { 108 int ret = param_set_int(val, kp); 109 if (!ret) { 110 int val = *(int *)kp->arg; 111 if (val < 0) 112 val = -val; 113 if (!val || val > 3) 114 return -EINVAL; 115 } 116 return ret; 117 } 118 119 static struct kernel_param_ops param_ops_axis = { 120 .set = param_set_axis, 121 .get = param_get_int, 122 }; 123 124 #define param_check_axis(name, p) param_check_int(name, p) 125 126 module_param_array_named(axes, lis3_dev.ac.as_array, axis, NULL, 0644); 127 MODULE_PARM_DESC(axes, "Axis-mapping for x,y,z directions"); 128 129 static s16 lis3lv02d_read_8(struct lis3lv02d *lis3, int reg) 130 { 131 s8 lo; 132 if (lis3->read(lis3, reg, &lo) < 0) 133 return 0; 134 135 return lo; 136 } 137 138 static s16 lis3lv02d_read_12(struct lis3lv02d *lis3, int reg) 139 { 140 u8 lo, hi; 141 142 lis3->read(lis3, reg - 1, &lo); 143 lis3->read(lis3, reg, &hi); 144 /* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */ 145 return (s16)((hi << 8) | lo); 146 } 147 148 /* 12bits for 2G range, 13 bits for 4G range and 14 bits for 8G range */ 149 static s16 lis331dlh_read_data(struct lis3lv02d *lis3, int reg) 150 { 151 u8 lo, hi; 152 int v; 153 154 lis3->read(lis3, reg - 1, &lo); 155 lis3->read(lis3, reg, &hi); 156 v = (int) ((hi << 8) | lo); 157 158 return (s16) v >> lis3->shift_adj; 159 } 160 161 /** 162 * lis3lv02d_get_axis - For the given axis, give the value converted 163 * @axis: 1,2,3 - can also be negative 164 * @hw_values: raw values returned by the hardware 165 * 166 * Returns the converted value. 167 */ 168 static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3]) 169 { 170 if (axis > 0) 171 return hw_values[axis - 1]; 172 else 173 return -hw_values[-axis - 1]; 174 } 175 176 /** 177 * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer 178 * @lis3: pointer to the device struct 179 * @x: where to store the X axis value 180 * @y: where to store the Y axis value 181 * @z: where to store the Z axis value 182 * 183 * Note that 40Hz input device can eat up about 10% CPU at 800MHZ 184 */ 185 static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z) 186 { 187 int position[3]; 188 int i; 189 190 if (lis3->blkread) { 191 if (lis3->whoami == WAI_12B) { 192 u16 data[3]; 193 lis3->blkread(lis3, OUTX_L, 6, (u8 *)data); 194 for (i = 0; i < 3; i++) 195 position[i] = (s16)le16_to_cpu(data[i]); 196 } else { 197 u8 data[5]; 198 /* Data: x, dummy, y, dummy, z */ 199 lis3->blkread(lis3, OUTX, 5, data); 200 for (i = 0; i < 3; i++) 201 position[i] = (s8)data[i * 2]; 202 } 203 } else { 204 position[0] = lis3->read_data(lis3, OUTX); 205 position[1] = lis3->read_data(lis3, OUTY); 206 position[2] = lis3->read_data(lis3, OUTZ); 207 } 208 209 for (i = 0; i < 3; i++) 210 position[i] = (position[i] * lis3->scale) / LIS3_ACCURACY; 211 212 *x = lis3lv02d_get_axis(lis3->ac.x, position); 213 *y = lis3lv02d_get_axis(lis3->ac.y, position); 214 *z = lis3lv02d_get_axis(lis3->ac.z, position); 215 } 216 217 /* conversion btw sampling rate and the register values */ 218 static int lis3_12_rates[4] = {40, 160, 640, 2560}; 219 static int lis3_8_rates[2] = {100, 400}; 220 static int lis3_3dc_rates[16] = {0, 1, 10, 25, 50, 100, 200, 400, 1600, 5000}; 221 static int lis3_3dlh_rates[4] = {50, 100, 400, 1000}; 222 223 /* ODR is Output Data Rate */ 224 static int lis3lv02d_get_odr(struct lis3lv02d *lis3) 225 { 226 u8 ctrl; 227 int shift; 228 229 lis3->read(lis3, CTRL_REG1, &ctrl); 230 ctrl &= lis3->odr_mask; 231 shift = ffs(lis3->odr_mask) - 1; 232 return lis3->odrs[(ctrl >> shift)]; 233 } 234 235 static int lis3lv02d_get_pwron_wait(struct lis3lv02d *lis3) 236 { 237 int div = lis3lv02d_get_odr(lis3); 238 239 if (WARN_ONCE(div == 0, "device returned spurious data")) 240 return -ENXIO; 241 242 /* LIS3 power on delay is quite long */ 243 msleep(lis3->pwron_delay / div); 244 return 0; 245 } 246 247 static int lis3lv02d_set_odr(struct lis3lv02d *lis3, int rate) 248 { 249 u8 ctrl; 250 int i, len, shift; 251 252 if (!rate) 253 return -EINVAL; 254 255 lis3->read(lis3, CTRL_REG1, &ctrl); 256 ctrl &= ~lis3->odr_mask; 257 len = 1 << hweight_long(lis3->odr_mask); /* # of possible values */ 258 shift = ffs(lis3->odr_mask) - 1; 259 260 for (i = 0; i < len; i++) 261 if (lis3->odrs[i] == rate) { 262 lis3->write(lis3, CTRL_REG1, 263 ctrl | (i << shift)); 264 return 0; 265 } 266 return -EINVAL; 267 } 268 269 static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3]) 270 { 271 u8 ctlreg, reg; 272 s16 x, y, z; 273 u8 selftest; 274 int ret; 275 u8 ctrl_reg_data; 276 unsigned char irq_cfg; 277 278 mutex_lock(&lis3->mutex); 279 280 irq_cfg = lis3->irq_cfg; 281 if (lis3->whoami == WAI_8B) { 282 lis3->data_ready_count[IRQ_LINE0] = 0; 283 lis3->data_ready_count[IRQ_LINE1] = 0; 284 285 /* Change interrupt cfg to data ready for selftest */ 286 atomic_inc(&lis3->wake_thread); 287 lis3->irq_cfg = LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY; 288 lis3->read(lis3, CTRL_REG3, &ctrl_reg_data); 289 lis3->write(lis3, CTRL_REG3, (ctrl_reg_data & 290 ~(LIS3_IRQ1_MASK | LIS3_IRQ2_MASK)) | 291 (LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY)); 292 } 293 294 if ((lis3->whoami == WAI_3DC) || (lis3->whoami == WAI_3DLH)) { 295 ctlreg = CTRL_REG4; 296 selftest = CTRL4_ST0; 297 } else { 298 ctlreg = CTRL_REG1; 299 if (lis3->whoami == WAI_12B) 300 selftest = CTRL1_ST; 301 else 302 selftest = CTRL1_STP; 303 } 304 305 lis3->read(lis3, ctlreg, ®); 306 lis3->write(lis3, ctlreg, (reg | selftest)); 307 ret = lis3lv02d_get_pwron_wait(lis3); 308 if (ret) 309 goto fail; 310 311 /* Read directly to avoid axis remap */ 312 x = lis3->read_data(lis3, OUTX); 313 y = lis3->read_data(lis3, OUTY); 314 z = lis3->read_data(lis3, OUTZ); 315 316 /* back to normal settings */ 317 lis3->write(lis3, ctlreg, reg); 318 ret = lis3lv02d_get_pwron_wait(lis3); 319 if (ret) 320 goto fail; 321 322 results[0] = x - lis3->read_data(lis3, OUTX); 323 results[1] = y - lis3->read_data(lis3, OUTY); 324 results[2] = z - lis3->read_data(lis3, OUTZ); 325 326 ret = 0; 327 328 if (lis3->whoami == WAI_8B) { 329 /* Restore original interrupt configuration */ 330 atomic_dec(&lis3->wake_thread); 331 lis3->write(lis3, CTRL_REG3, ctrl_reg_data); 332 lis3->irq_cfg = irq_cfg; 333 334 if ((irq_cfg & LIS3_IRQ1_MASK) && 335 lis3->data_ready_count[IRQ_LINE0] < 2) { 336 ret = SELFTEST_IRQ; 337 goto fail; 338 } 339 340 if ((irq_cfg & LIS3_IRQ2_MASK) && 341 lis3->data_ready_count[IRQ_LINE1] < 2) { 342 ret = SELFTEST_IRQ; 343 goto fail; 344 } 345 } 346 347 if (lis3->pdata) { 348 int i; 349 for (i = 0; i < 3; i++) { 350 /* Check against selftest acceptance limits */ 351 if ((results[i] < lis3->pdata->st_min_limits[i]) || 352 (results[i] > lis3->pdata->st_max_limits[i])) { 353 ret = SELFTEST_FAIL; 354 goto fail; 355 } 356 } 357 } 358 359 /* test passed */ 360 fail: 361 mutex_unlock(&lis3->mutex); 362 return ret; 363 } 364 365 /* 366 * Order of registers in the list affects to order of the restore process. 367 * Perhaps it is a good idea to set interrupt enable register as a last one 368 * after all other configurations 369 */ 370 static u8 lis3_wai8_regs[] = { FF_WU_CFG_1, FF_WU_THS_1, FF_WU_DURATION_1, 371 FF_WU_CFG_2, FF_WU_THS_2, FF_WU_DURATION_2, 372 CLICK_CFG, CLICK_SRC, CLICK_THSY_X, CLICK_THSZ, 373 CLICK_TIMELIMIT, CLICK_LATENCY, CLICK_WINDOW, 374 CTRL_REG1, CTRL_REG2, CTRL_REG3}; 375 376 static u8 lis3_wai12_regs[] = {FF_WU_CFG, FF_WU_THS_L, FF_WU_THS_H, 377 FF_WU_DURATION, DD_CFG, DD_THSI_L, DD_THSI_H, 378 DD_THSE_L, DD_THSE_H, 379 CTRL_REG1, CTRL_REG3, CTRL_REG2}; 380 381 static inline void lis3_context_save(struct lis3lv02d *lis3) 382 { 383 int i; 384 for (i = 0; i < lis3->regs_size; i++) 385 lis3->read(lis3, lis3->regs[i], &lis3->reg_cache[i]); 386 lis3->regs_stored = true; 387 } 388 389 static inline void lis3_context_restore(struct lis3lv02d *lis3) 390 { 391 int i; 392 if (lis3->regs_stored) 393 for (i = 0; i < lis3->regs_size; i++) 394 lis3->write(lis3, lis3->regs[i], lis3->reg_cache[i]); 395 } 396 397 void lis3lv02d_poweroff(struct lis3lv02d *lis3) 398 { 399 if (lis3->reg_ctrl) 400 lis3_context_save(lis3); 401 /* disable X,Y,Z axis and power down */ 402 lis3->write(lis3, CTRL_REG1, 0x00); 403 if (lis3->reg_ctrl) 404 lis3->reg_ctrl(lis3, LIS3_REG_OFF); 405 } 406 EXPORT_SYMBOL_GPL(lis3lv02d_poweroff); 407 408 int lis3lv02d_poweron(struct lis3lv02d *lis3) 409 { 410 int err; 411 u8 reg; 412 413 lis3->init(lis3); 414 415 /* 416 * Common configuration 417 * BDU: (12 bits sensors only) LSB and MSB values are not updated until 418 * both have been read. So the value read will always be correct. 419 * Set BOOT bit to refresh factory tuning values. 420 */ 421 if (lis3->pdata) { 422 lis3->read(lis3, CTRL_REG2, ®); 423 if (lis3->whoami == WAI_12B) 424 reg |= CTRL2_BDU | CTRL2_BOOT; 425 else if (lis3->whoami == WAI_3DLH) 426 reg |= CTRL2_BOOT_3DLH; 427 else 428 reg |= CTRL2_BOOT_8B; 429 lis3->write(lis3, CTRL_REG2, reg); 430 431 if (lis3->whoami == WAI_3DLH) { 432 lis3->read(lis3, CTRL_REG4, ®); 433 reg |= CTRL4_BDU; 434 lis3->write(lis3, CTRL_REG4, reg); 435 } 436 } 437 438 err = lis3lv02d_get_pwron_wait(lis3); 439 if (err) 440 return err; 441 442 if (lis3->reg_ctrl) 443 lis3_context_restore(lis3); 444 445 return 0; 446 } 447 EXPORT_SYMBOL_GPL(lis3lv02d_poweron); 448 449 450 static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev) 451 { 452 struct lis3lv02d *lis3 = pidev->private; 453 int x, y, z; 454 455 mutex_lock(&lis3->mutex); 456 lis3lv02d_get_xyz(lis3, &x, &y, &z); 457 input_report_abs(pidev->input, ABS_X, x); 458 input_report_abs(pidev->input, ABS_Y, y); 459 input_report_abs(pidev->input, ABS_Z, z); 460 input_sync(pidev->input); 461 mutex_unlock(&lis3->mutex); 462 } 463 464 static void lis3lv02d_joystick_open(struct input_polled_dev *pidev) 465 { 466 struct lis3lv02d *lis3 = pidev->private; 467 468 if (lis3->pm_dev) 469 pm_runtime_get_sync(lis3->pm_dev); 470 471 if (lis3->pdata && lis3->whoami == WAI_8B && lis3->idev) 472 atomic_set(&lis3->wake_thread, 1); 473 /* 474 * Update coordinates for the case where poll interval is 0 and 475 * the chip in running purely under interrupt control 476 */ 477 lis3lv02d_joystick_poll(pidev); 478 } 479 480 static void lis3lv02d_joystick_close(struct input_polled_dev *pidev) 481 { 482 struct lis3lv02d *lis3 = pidev->private; 483 484 atomic_set(&lis3->wake_thread, 0); 485 if (lis3->pm_dev) 486 pm_runtime_put(lis3->pm_dev); 487 } 488 489 static irqreturn_t lis302dl_interrupt(int irq, void *data) 490 { 491 struct lis3lv02d *lis3 = data; 492 493 if (!test_bit(0, &lis3->misc_opened)) 494 goto out; 495 496 /* 497 * Be careful: on some HP laptops the bios force DD when on battery and 498 * the lid is closed. This leads to interrupts as soon as a little move 499 * is done. 500 */ 501 atomic_inc(&lis3->count); 502 503 wake_up_interruptible(&lis3->misc_wait); 504 kill_fasync(&lis3->async_queue, SIGIO, POLL_IN); 505 out: 506 if (atomic_read(&lis3->wake_thread)) 507 return IRQ_WAKE_THREAD; 508 return IRQ_HANDLED; 509 } 510 511 static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3) 512 { 513 struct input_dev *dev = lis3->idev->input; 514 u8 click_src; 515 516 mutex_lock(&lis3->mutex); 517 lis3->read(lis3, CLICK_SRC, &click_src); 518 519 if (click_src & CLICK_SINGLE_X) { 520 input_report_key(dev, lis3->mapped_btns[0], 1); 521 input_report_key(dev, lis3->mapped_btns[0], 0); 522 } 523 524 if (click_src & CLICK_SINGLE_Y) { 525 input_report_key(dev, lis3->mapped_btns[1], 1); 526 input_report_key(dev, lis3->mapped_btns[1], 0); 527 } 528 529 if (click_src & CLICK_SINGLE_Z) { 530 input_report_key(dev, lis3->mapped_btns[2], 1); 531 input_report_key(dev, lis3->mapped_btns[2], 0); 532 } 533 input_sync(dev); 534 mutex_unlock(&lis3->mutex); 535 } 536 537 static inline void lis302dl_data_ready(struct lis3lv02d *lis3, int index) 538 { 539 int dummy; 540 541 /* Dummy read to ack interrupt */ 542 lis3lv02d_get_xyz(lis3, &dummy, &dummy, &dummy); 543 lis3->data_ready_count[index]++; 544 } 545 546 static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data) 547 { 548 struct lis3lv02d *lis3 = data; 549 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ1_MASK; 550 551 if (irq_cfg == LIS3_IRQ1_CLICK) 552 lis302dl_interrupt_handle_click(lis3); 553 else if (unlikely(irq_cfg == LIS3_IRQ1_DATA_READY)) 554 lis302dl_data_ready(lis3, IRQ_LINE0); 555 else 556 lis3lv02d_joystick_poll(lis3->idev); 557 558 return IRQ_HANDLED; 559 } 560 561 static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data) 562 { 563 struct lis3lv02d *lis3 = data; 564 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ2_MASK; 565 566 if (irq_cfg == LIS3_IRQ2_CLICK) 567 lis302dl_interrupt_handle_click(lis3); 568 else if (unlikely(irq_cfg == LIS3_IRQ2_DATA_READY)) 569 lis302dl_data_ready(lis3, IRQ_LINE1); 570 else 571 lis3lv02d_joystick_poll(lis3->idev); 572 573 return IRQ_HANDLED; 574 } 575 576 static int lis3lv02d_misc_open(struct inode *inode, struct file *file) 577 { 578 struct lis3lv02d *lis3 = container_of(file->private_data, 579 struct lis3lv02d, miscdev); 580 581 if (test_and_set_bit(0, &lis3->misc_opened)) 582 return -EBUSY; /* already open */ 583 584 if (lis3->pm_dev) 585 pm_runtime_get_sync(lis3->pm_dev); 586 587 atomic_set(&lis3->count, 0); 588 return 0; 589 } 590 591 static int lis3lv02d_misc_release(struct inode *inode, struct file *file) 592 { 593 struct lis3lv02d *lis3 = container_of(file->private_data, 594 struct lis3lv02d, miscdev); 595 596 fasync_helper(-1, file, 0, &lis3->async_queue); 597 clear_bit(0, &lis3->misc_opened); /* release the device */ 598 if (lis3->pm_dev) 599 pm_runtime_put(lis3->pm_dev); 600 return 0; 601 } 602 603 static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf, 604 size_t count, loff_t *pos) 605 { 606 struct lis3lv02d *lis3 = container_of(file->private_data, 607 struct lis3lv02d, miscdev); 608 609 DECLARE_WAITQUEUE(wait, current); 610 u32 data; 611 unsigned char byte_data; 612 ssize_t retval = 1; 613 614 if (count < 1) 615 return -EINVAL; 616 617 add_wait_queue(&lis3->misc_wait, &wait); 618 while (true) { 619 set_current_state(TASK_INTERRUPTIBLE); 620 data = atomic_xchg(&lis3->count, 0); 621 if (data) 622 break; 623 624 if (file->f_flags & O_NONBLOCK) { 625 retval = -EAGAIN; 626 goto out; 627 } 628 629 if (signal_pending(current)) { 630 retval = -ERESTARTSYS; 631 goto out; 632 } 633 634 schedule(); 635 } 636 637 if (data < 255) 638 byte_data = data; 639 else 640 byte_data = 255; 641 642 /* make sure we are not going into copy_to_user() with 643 * TASK_INTERRUPTIBLE state */ 644 set_current_state(TASK_RUNNING); 645 if (copy_to_user(buf, &byte_data, sizeof(byte_data))) 646 retval = -EFAULT; 647 648 out: 649 __set_current_state(TASK_RUNNING); 650 remove_wait_queue(&lis3->misc_wait, &wait); 651 652 return retval; 653 } 654 655 static unsigned int lis3lv02d_misc_poll(struct file *file, poll_table *wait) 656 { 657 struct lis3lv02d *lis3 = container_of(file->private_data, 658 struct lis3lv02d, miscdev); 659 660 poll_wait(file, &lis3->misc_wait, wait); 661 if (atomic_read(&lis3->count)) 662 return POLLIN | POLLRDNORM; 663 return 0; 664 } 665 666 static int lis3lv02d_misc_fasync(int fd, struct file *file, int on) 667 { 668 struct lis3lv02d *lis3 = container_of(file->private_data, 669 struct lis3lv02d, miscdev); 670 671 return fasync_helper(fd, file, on, &lis3->async_queue); 672 } 673 674 static const struct file_operations lis3lv02d_misc_fops = { 675 .owner = THIS_MODULE, 676 .llseek = no_llseek, 677 .read = lis3lv02d_misc_read, 678 .open = lis3lv02d_misc_open, 679 .release = lis3lv02d_misc_release, 680 .poll = lis3lv02d_misc_poll, 681 .fasync = lis3lv02d_misc_fasync, 682 }; 683 684 int lis3lv02d_joystick_enable(struct lis3lv02d *lis3) 685 { 686 struct input_dev *input_dev; 687 int err; 688 int max_val, fuzz, flat; 689 int btns[] = {BTN_X, BTN_Y, BTN_Z}; 690 691 if (lis3->idev) 692 return -EINVAL; 693 694 lis3->idev = input_allocate_polled_device(); 695 if (!lis3->idev) 696 return -ENOMEM; 697 698 lis3->idev->poll = lis3lv02d_joystick_poll; 699 lis3->idev->open = lis3lv02d_joystick_open; 700 lis3->idev->close = lis3lv02d_joystick_close; 701 lis3->idev->poll_interval = MDPS_POLL_INTERVAL; 702 lis3->idev->poll_interval_min = MDPS_POLL_MIN; 703 lis3->idev->poll_interval_max = MDPS_POLL_MAX; 704 lis3->idev->private = lis3; 705 input_dev = lis3->idev->input; 706 707 input_dev->name = "ST LIS3LV02DL Accelerometer"; 708 input_dev->phys = DRIVER_NAME "/input0"; 709 input_dev->id.bustype = BUS_HOST; 710 input_dev->id.vendor = 0; 711 input_dev->dev.parent = &lis3->pdev->dev; 712 713 set_bit(EV_ABS, input_dev->evbit); 714 max_val = (lis3->mdps_max_val * lis3->scale) / LIS3_ACCURACY; 715 if (lis3->whoami == WAI_12B) { 716 fuzz = LIS3_DEFAULT_FUZZ_12B; 717 flat = LIS3_DEFAULT_FLAT_12B; 718 } else { 719 fuzz = LIS3_DEFAULT_FUZZ_8B; 720 flat = LIS3_DEFAULT_FLAT_8B; 721 } 722 fuzz = (fuzz * lis3->scale) / LIS3_ACCURACY; 723 flat = (flat * lis3->scale) / LIS3_ACCURACY; 724 725 input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat); 726 input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat); 727 input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat); 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_polled_device(lis3->idev); 734 if (err) { 735 input_free_polled_device(lis3->idev); 736 lis3->idev = NULL; 737 } 738 739 return err; 740 } 741 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable); 742 743 void lis3lv02d_joystick_disable(struct lis3lv02d *lis3) 744 { 745 if (lis3->irq) 746 free_irq(lis3->irq, lis3); 747 if (lis3->pdata && lis3->pdata->irq2) 748 free_irq(lis3->pdata->irq2, lis3); 749 750 if (!lis3->idev) 751 return; 752 753 if (lis3->irq) 754 misc_deregister(&lis3->miscdev); 755 input_unregister_polled_device(lis3->idev); 756 input_free_polled_device(lis3->idev); 757 lis3->idev = NULL; 758 } 759 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable); 760 761 /* Sysfs stuff */ 762 static void lis3lv02d_sysfs_poweron(struct lis3lv02d *lis3) 763 { 764 /* 765 * SYSFS functions are fast visitors so put-call 766 * immediately after the get-call. However, keep 767 * chip running for a while and schedule delayed 768 * suspend. This way periodic sysfs calls doesn't 769 * suffer from relatively long power up time. 770 */ 771 772 if (lis3->pm_dev) { 773 pm_runtime_get_sync(lis3->pm_dev); 774 pm_runtime_put_noidle(lis3->pm_dev); 775 pm_schedule_suspend(lis3->pm_dev, LIS3_SYSFS_POWERDOWN_DELAY); 776 } 777 } 778 779 static ssize_t lis3lv02d_selftest_show(struct device *dev, 780 struct device_attribute *attr, char *buf) 781 { 782 struct lis3lv02d *lis3 = dev_get_drvdata(dev); 783 s16 values[3]; 784 785 static const char ok[] = "OK"; 786 static const char fail[] = "FAIL"; 787 static const char irq[] = "FAIL_IRQ"; 788 const char *res; 789 790 lis3lv02d_sysfs_poweron(lis3); 791 switch (lis3lv02d_selftest(lis3, values)) { 792 case SELFTEST_FAIL: 793 res = fail; 794 break; 795 case SELFTEST_IRQ: 796 res = irq; 797 break; 798 case SELFTEST_OK: 799 default: 800 res = ok; 801 break; 802 } 803 return sprintf(buf, "%s %d %d %d\n", res, 804 values[0], values[1], values[2]); 805 } 806 807 static ssize_t lis3lv02d_position_show(struct device *dev, 808 struct device_attribute *attr, char *buf) 809 { 810 struct lis3lv02d *lis3 = dev_get_drvdata(dev); 811 int x, y, z; 812 813 lis3lv02d_sysfs_poweron(lis3); 814 mutex_lock(&lis3->mutex); 815 lis3lv02d_get_xyz(lis3, &x, &y, &z); 816 mutex_unlock(&lis3->mutex); 817 return sprintf(buf, "(%d,%d,%d)\n", x, y, z); 818 } 819 820 static ssize_t lis3lv02d_rate_show(struct device *dev, 821 struct device_attribute *attr, char *buf) 822 { 823 struct lis3lv02d *lis3 = dev_get_drvdata(dev); 824 825 lis3lv02d_sysfs_poweron(lis3); 826 return sprintf(buf, "%d\n", lis3lv02d_get_odr(lis3)); 827 } 828 829 static ssize_t lis3lv02d_rate_set(struct device *dev, 830 struct device_attribute *attr, const char *buf, 831 size_t count) 832 { 833 struct lis3lv02d *lis3 = dev_get_drvdata(dev); 834 unsigned long rate; 835 836 if (strict_strtoul(buf, 0, &rate)) 837 return -EINVAL; 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