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 "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 #define LIS3_DEFAULT_FUZZ_12B 3 84 #define LIS3_DEFAULT_FLAT_12B 3 85 #define LIS3_DEFAULT_FUZZ_8B 1 86 #define LIS3_DEFAULT_FLAT_8B 1 87 88 struct lis3lv02d lis3_dev = { 89 .misc_wait = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait), 90 }; 91 EXPORT_SYMBOL_GPL(lis3_dev); 92 93 /* just like param_set_int() but does sanity-check so that it won't point 94 * over the axis array size 95 */ 96 static int param_set_axis(const char *val, const struct kernel_param *kp) 97 { 98 int ret = param_set_int(val, kp); 99 if (!ret) { 100 int val = *(int *)kp->arg; 101 if (val < 0) 102 val = -val; 103 if (!val || val > 3) 104 return -EINVAL; 105 } 106 return ret; 107 } 108 109 static struct kernel_param_ops param_ops_axis = { 110 .set = param_set_axis, 111 .get = param_get_int, 112 }; 113 114 module_param_array_named(axes, lis3_dev.ac.as_array, axis, NULL, 0644); 115 MODULE_PARM_DESC(axes, "Axis-mapping for x,y,z directions"); 116 117 static s16 lis3lv02d_read_8(struct lis3lv02d *lis3, int reg) 118 { 119 s8 lo; 120 if (lis3->read(lis3, reg, &lo) < 0) 121 return 0; 122 123 return lo; 124 } 125 126 static s16 lis3lv02d_read_12(struct lis3lv02d *lis3, int reg) 127 { 128 u8 lo, hi; 129 130 lis3->read(lis3, reg - 1, &lo); 131 lis3->read(lis3, reg, &hi); 132 /* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */ 133 return (s16)((hi << 8) | lo); 134 } 135 136 /** 137 * lis3lv02d_get_axis - For the given axis, give the value converted 138 * @axis: 1,2,3 - can also be negative 139 * @hw_values: raw values returned by the hardware 140 * 141 * Returns the converted value. 142 */ 143 static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3]) 144 { 145 if (axis > 0) 146 return hw_values[axis - 1]; 147 else 148 return -hw_values[-axis - 1]; 149 } 150 151 /** 152 * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer 153 * @lis3: pointer to the device struct 154 * @x: where to store the X axis value 155 * @y: where to store the Y axis value 156 * @z: where to store the Z axis value 157 * 158 * Note that 40Hz input device can eat up about 10% CPU at 800MHZ 159 */ 160 static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z) 161 { 162 int position[3]; 163 int i; 164 165 if (lis3->blkread) { 166 if (lis3->whoami == WAI_12B) { 167 u16 data[3]; 168 lis3->blkread(lis3, OUTX_L, 6, (u8 *)data); 169 for (i = 0; i < 3; i++) 170 position[i] = (s16)le16_to_cpu(data[i]); 171 } else { 172 u8 data[5]; 173 /* Data: x, dummy, y, dummy, z */ 174 lis3->blkread(lis3, OUTX, 5, data); 175 for (i = 0; i < 3; i++) 176 position[i] = (s8)data[i * 2]; 177 } 178 } else { 179 position[0] = lis3->read_data(lis3, OUTX); 180 position[1] = lis3->read_data(lis3, OUTY); 181 position[2] = lis3->read_data(lis3, OUTZ); 182 } 183 184 for (i = 0; i < 3; i++) 185 position[i] = (position[i] * lis3->scale) / LIS3_ACCURACY; 186 187 *x = lis3lv02d_get_axis(lis3->ac.x, position); 188 *y = lis3lv02d_get_axis(lis3->ac.y, position); 189 *z = lis3lv02d_get_axis(lis3->ac.z, position); 190 } 191 192 /* conversion btw sampling rate and the register values */ 193 static int lis3_12_rates[4] = {40, 160, 640, 2560}; 194 static int lis3_8_rates[2] = {100, 400}; 195 static int lis3_3dc_rates[16] = {0, 1, 10, 25, 50, 100, 200, 400, 1600, 5000}; 196 197 /* ODR is Output Data Rate */ 198 static int lis3lv02d_get_odr(struct lis3lv02d *lis3) 199 { 200 u8 ctrl; 201 int shift; 202 203 lis3->read(lis3, CTRL_REG1, &ctrl); 204 ctrl &= lis3->odr_mask; 205 shift = ffs(lis3->odr_mask) - 1; 206 return lis3->odrs[(ctrl >> shift)]; 207 } 208 209 static int lis3lv02d_get_pwron_wait(struct lis3lv02d *lis3) 210 { 211 int div = lis3lv02d_get_odr(lis3); 212 213 if (WARN_ONCE(div == 0, "device returned spurious data")) 214 return -ENXIO; 215 216 /* LIS3 power on delay is quite long */ 217 msleep(lis3->pwron_delay / div); 218 return 0; 219 } 220 221 static int lis3lv02d_set_odr(struct lis3lv02d *lis3, int rate) 222 { 223 u8 ctrl; 224 int i, len, shift; 225 226 if (!rate) 227 return -EINVAL; 228 229 lis3->read(lis3, CTRL_REG1, &ctrl); 230 ctrl &= ~lis3->odr_mask; 231 len = 1 << hweight_long(lis3->odr_mask); /* # of possible values */ 232 shift = ffs(lis3->odr_mask) - 1; 233 234 for (i = 0; i < len; i++) 235 if (lis3->odrs[i] == rate) { 236 lis3->write(lis3, CTRL_REG1, 237 ctrl | (i << shift)); 238 return 0; 239 } 240 return -EINVAL; 241 } 242 243 static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3]) 244 { 245 u8 ctlreg, reg; 246 s16 x, y, z; 247 u8 selftest; 248 int ret; 249 u8 ctrl_reg_data; 250 unsigned char irq_cfg; 251 252 mutex_lock(&lis3->mutex); 253 254 irq_cfg = lis3->irq_cfg; 255 if (lis3->whoami == WAI_8B) { 256 lis3->data_ready_count[IRQ_LINE0] = 0; 257 lis3->data_ready_count[IRQ_LINE1] = 0; 258 259 /* Change interrupt cfg to data ready for selftest */ 260 atomic_inc(&lis3->wake_thread); 261 lis3->irq_cfg = LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY; 262 lis3->read(lis3, CTRL_REG3, &ctrl_reg_data); 263 lis3->write(lis3, CTRL_REG3, (ctrl_reg_data & 264 ~(LIS3_IRQ1_MASK | LIS3_IRQ2_MASK)) | 265 (LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY)); 266 } 267 268 if (lis3->whoami == WAI_3DC) { 269 ctlreg = CTRL_REG4; 270 selftest = CTRL4_ST0; 271 } else { 272 ctlreg = CTRL_REG1; 273 if (lis3->whoami == WAI_12B) 274 selftest = CTRL1_ST; 275 else 276 selftest = CTRL1_STP; 277 } 278 279 lis3->read(lis3, ctlreg, ®); 280 lis3->write(lis3, ctlreg, (reg | selftest)); 281 ret = lis3lv02d_get_pwron_wait(lis3); 282 if (ret) 283 goto fail; 284 285 /* Read directly to avoid axis remap */ 286 x = lis3->read_data(lis3, OUTX); 287 y = lis3->read_data(lis3, OUTY); 288 z = lis3->read_data(lis3, OUTZ); 289 290 /* back to normal settings */ 291 lis3->write(lis3, ctlreg, reg); 292 ret = lis3lv02d_get_pwron_wait(lis3); 293 if (ret) 294 goto fail; 295 296 results[0] = x - lis3->read_data(lis3, OUTX); 297 results[1] = y - lis3->read_data(lis3, OUTY); 298 results[2] = z - lis3->read_data(lis3, OUTZ); 299 300 ret = 0; 301 302 if (lis3->whoami == WAI_8B) { 303 /* Restore original interrupt configuration */ 304 atomic_dec(&lis3->wake_thread); 305 lis3->write(lis3, CTRL_REG3, ctrl_reg_data); 306 lis3->irq_cfg = irq_cfg; 307 308 if ((irq_cfg & LIS3_IRQ1_MASK) && 309 lis3->data_ready_count[IRQ_LINE0] < 2) { 310 ret = SELFTEST_IRQ; 311 goto fail; 312 } 313 314 if ((irq_cfg & LIS3_IRQ2_MASK) && 315 lis3->data_ready_count[IRQ_LINE1] < 2) { 316 ret = SELFTEST_IRQ; 317 goto fail; 318 } 319 } 320 321 if (lis3->pdata) { 322 int i; 323 for (i = 0; i < 3; i++) { 324 /* Check against selftest acceptance limits */ 325 if ((results[i] < lis3->pdata->st_min_limits[i]) || 326 (results[i] > lis3->pdata->st_max_limits[i])) { 327 ret = SELFTEST_FAIL; 328 goto fail; 329 } 330 } 331 } 332 333 /* test passed */ 334 fail: 335 mutex_unlock(&lis3->mutex); 336 return ret; 337 } 338 339 /* 340 * Order of registers in the list affects to order of the restore process. 341 * Perhaps it is a good idea to set interrupt enable register as a last one 342 * after all other configurations 343 */ 344 static u8 lis3_wai8_regs[] = { FF_WU_CFG_1, FF_WU_THS_1, FF_WU_DURATION_1, 345 FF_WU_CFG_2, FF_WU_THS_2, FF_WU_DURATION_2, 346 CLICK_CFG, CLICK_SRC, CLICK_THSY_X, CLICK_THSZ, 347 CLICK_TIMELIMIT, CLICK_LATENCY, CLICK_WINDOW, 348 CTRL_REG1, CTRL_REG2, CTRL_REG3}; 349 350 static u8 lis3_wai12_regs[] = {FF_WU_CFG, FF_WU_THS_L, FF_WU_THS_H, 351 FF_WU_DURATION, DD_CFG, DD_THSI_L, DD_THSI_H, 352 DD_THSE_L, DD_THSE_H, 353 CTRL_REG1, CTRL_REG3, CTRL_REG2}; 354 355 static inline void lis3_context_save(struct lis3lv02d *lis3) 356 { 357 int i; 358 for (i = 0; i < lis3->regs_size; i++) 359 lis3->read(lis3, lis3->regs[i], &lis3->reg_cache[i]); 360 lis3->regs_stored = true; 361 } 362 363 static inline void lis3_context_restore(struct lis3lv02d *lis3) 364 { 365 int i; 366 if (lis3->regs_stored) 367 for (i = 0; i < lis3->regs_size; i++) 368 lis3->write(lis3, lis3->regs[i], lis3->reg_cache[i]); 369 } 370 371 void lis3lv02d_poweroff(struct lis3lv02d *lis3) 372 { 373 if (lis3->reg_ctrl) 374 lis3_context_save(lis3); 375 /* disable X,Y,Z axis and power down */ 376 lis3->write(lis3, CTRL_REG1, 0x00); 377 if (lis3->reg_ctrl) 378 lis3->reg_ctrl(lis3, LIS3_REG_OFF); 379 } 380 EXPORT_SYMBOL_GPL(lis3lv02d_poweroff); 381 382 int lis3lv02d_poweron(struct lis3lv02d *lis3) 383 { 384 int err; 385 u8 reg; 386 387 lis3->init(lis3); 388 389 /* 390 * Common configuration 391 * BDU: (12 bits sensors only) LSB and MSB values are not updated until 392 * both have been read. So the value read will always be correct. 393 * Set BOOT bit to refresh factory tuning values. 394 */ 395 if (lis3->pdata) { 396 lis3->read(lis3, CTRL_REG2, ®); 397 if (lis3->whoami == WAI_12B) 398 reg |= CTRL2_BDU | CTRL2_BOOT; 399 else 400 reg |= CTRL2_BOOT_8B; 401 lis3->write(lis3, CTRL_REG2, reg); 402 } 403 404 err = lis3lv02d_get_pwron_wait(lis3); 405 if (err) 406 return err; 407 408 if (lis3->reg_ctrl) 409 lis3_context_restore(lis3); 410 411 return 0; 412 } 413 EXPORT_SYMBOL_GPL(lis3lv02d_poweron); 414 415 416 static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev) 417 { 418 struct lis3lv02d *lis3 = pidev->private; 419 int x, y, z; 420 421 mutex_lock(&lis3->mutex); 422 lis3lv02d_get_xyz(lis3, &x, &y, &z); 423 input_report_abs(pidev->input, ABS_X, x); 424 input_report_abs(pidev->input, ABS_Y, y); 425 input_report_abs(pidev->input, ABS_Z, z); 426 input_sync(pidev->input); 427 mutex_unlock(&lis3->mutex); 428 } 429 430 static void lis3lv02d_joystick_open(struct input_polled_dev *pidev) 431 { 432 struct lis3lv02d *lis3 = pidev->private; 433 434 if (lis3->pm_dev) 435 pm_runtime_get_sync(lis3->pm_dev); 436 437 if (lis3->pdata && lis3->whoami == WAI_8B && lis3->idev) 438 atomic_set(&lis3->wake_thread, 1); 439 /* 440 * Update coordinates for the case where poll interval is 0 and 441 * the chip in running purely under interrupt control 442 */ 443 lis3lv02d_joystick_poll(pidev); 444 } 445 446 static void lis3lv02d_joystick_close(struct input_polled_dev *pidev) 447 { 448 struct lis3lv02d *lis3 = pidev->private; 449 450 atomic_set(&lis3->wake_thread, 0); 451 if (lis3->pm_dev) 452 pm_runtime_put(lis3->pm_dev); 453 } 454 455 static irqreturn_t lis302dl_interrupt(int irq, void *data) 456 { 457 struct lis3lv02d *lis3 = data; 458 459 if (!test_bit(0, &lis3->misc_opened)) 460 goto out; 461 462 /* 463 * Be careful: on some HP laptops the bios force DD when on battery and 464 * the lid is closed. This leads to interrupts as soon as a little move 465 * is done. 466 */ 467 atomic_inc(&lis3->count); 468 469 wake_up_interruptible(&lis3->misc_wait); 470 kill_fasync(&lis3->async_queue, SIGIO, POLL_IN); 471 out: 472 if (atomic_read(&lis3->wake_thread)) 473 return IRQ_WAKE_THREAD; 474 return IRQ_HANDLED; 475 } 476 477 static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3) 478 { 479 struct input_dev *dev = lis3->idev->input; 480 u8 click_src; 481 482 mutex_lock(&lis3->mutex); 483 lis3->read(lis3, CLICK_SRC, &click_src); 484 485 if (click_src & CLICK_SINGLE_X) { 486 input_report_key(dev, lis3->mapped_btns[0], 1); 487 input_report_key(dev, lis3->mapped_btns[0], 0); 488 } 489 490 if (click_src & CLICK_SINGLE_Y) { 491 input_report_key(dev, lis3->mapped_btns[1], 1); 492 input_report_key(dev, lis3->mapped_btns[1], 0); 493 } 494 495 if (click_src & CLICK_SINGLE_Z) { 496 input_report_key(dev, lis3->mapped_btns[2], 1); 497 input_report_key(dev, lis3->mapped_btns[2], 0); 498 } 499 input_sync(dev); 500 mutex_unlock(&lis3->mutex); 501 } 502 503 static inline void lis302dl_data_ready(struct lis3lv02d *lis3, int index) 504 { 505 int dummy; 506 507 /* Dummy read to ack interrupt */ 508 lis3lv02d_get_xyz(lis3, &dummy, &dummy, &dummy); 509 lis3->data_ready_count[index]++; 510 } 511 512 static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data) 513 { 514 struct lis3lv02d *lis3 = data; 515 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ1_MASK; 516 517 if (irq_cfg == LIS3_IRQ1_CLICK) 518 lis302dl_interrupt_handle_click(lis3); 519 else if (unlikely(irq_cfg == LIS3_IRQ1_DATA_READY)) 520 lis302dl_data_ready(lis3, IRQ_LINE0); 521 else 522 lis3lv02d_joystick_poll(lis3->idev); 523 524 return IRQ_HANDLED; 525 } 526 527 static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data) 528 { 529 struct lis3lv02d *lis3 = data; 530 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ2_MASK; 531 532 if (irq_cfg == LIS3_IRQ2_CLICK) 533 lis302dl_interrupt_handle_click(lis3); 534 else if (unlikely(irq_cfg == LIS3_IRQ2_DATA_READY)) 535 lis302dl_data_ready(lis3, IRQ_LINE1); 536 else 537 lis3lv02d_joystick_poll(lis3->idev); 538 539 return IRQ_HANDLED; 540 } 541 542 static int lis3lv02d_misc_open(struct inode *inode, struct file *file) 543 { 544 struct lis3lv02d *lis3 = container_of(file->private_data, 545 struct lis3lv02d, miscdev); 546 547 if (test_and_set_bit(0, &lis3->misc_opened)) 548 return -EBUSY; /* already open */ 549 550 if (lis3->pm_dev) 551 pm_runtime_get_sync(lis3->pm_dev); 552 553 atomic_set(&lis3->count, 0); 554 return 0; 555 } 556 557 static int lis3lv02d_misc_release(struct inode *inode, struct file *file) 558 { 559 struct lis3lv02d *lis3 = container_of(file->private_data, 560 struct lis3lv02d, miscdev); 561 562 fasync_helper(-1, file, 0, &lis3->async_queue); 563 clear_bit(0, &lis3->misc_opened); /* release the device */ 564 if (lis3->pm_dev) 565 pm_runtime_put(lis3->pm_dev); 566 return 0; 567 } 568 569 static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf, 570 size_t count, loff_t *pos) 571 { 572 struct lis3lv02d *lis3 = container_of(file->private_data, 573 struct lis3lv02d, miscdev); 574 575 DECLARE_WAITQUEUE(wait, current); 576 u32 data; 577 unsigned char byte_data; 578 ssize_t retval = 1; 579 580 if (count < 1) 581 return -EINVAL; 582 583 add_wait_queue(&lis3->misc_wait, &wait); 584 while (true) { 585 set_current_state(TASK_INTERRUPTIBLE); 586 data = atomic_xchg(&lis3->count, 0); 587 if (data) 588 break; 589 590 if (file->f_flags & O_NONBLOCK) { 591 retval = -EAGAIN; 592 goto out; 593 } 594 595 if (signal_pending(current)) { 596 retval = -ERESTARTSYS; 597 goto out; 598 } 599 600 schedule(); 601 } 602 603 if (data < 255) 604 byte_data = data; 605 else 606 byte_data = 255; 607 608 /* make sure we are not going into copy_to_user() with 609 * TASK_INTERRUPTIBLE state */ 610 set_current_state(TASK_RUNNING); 611 if (copy_to_user(buf, &byte_data, sizeof(byte_data))) 612 retval = -EFAULT; 613 614 out: 615 __set_current_state(TASK_RUNNING); 616 remove_wait_queue(&lis3->misc_wait, &wait); 617 618 return retval; 619 } 620 621 static unsigned int lis3lv02d_misc_poll(struct file *file, poll_table *wait) 622 { 623 struct lis3lv02d *lis3 = container_of(file->private_data, 624 struct lis3lv02d, miscdev); 625 626 poll_wait(file, &lis3->misc_wait, wait); 627 if (atomic_read(&lis3->count)) 628 return POLLIN | POLLRDNORM; 629 return 0; 630 } 631 632 static int lis3lv02d_misc_fasync(int fd, struct file *file, int on) 633 { 634 struct lis3lv02d *lis3 = container_of(file->private_data, 635 struct lis3lv02d, miscdev); 636 637 return fasync_helper(fd, file, on, &lis3->async_queue); 638 } 639 640 static const struct file_operations lis3lv02d_misc_fops = { 641 .owner = THIS_MODULE, 642 .llseek = no_llseek, 643 .read = lis3lv02d_misc_read, 644 .open = lis3lv02d_misc_open, 645 .release = lis3lv02d_misc_release, 646 .poll = lis3lv02d_misc_poll, 647 .fasync = lis3lv02d_misc_fasync, 648 }; 649 650 int lis3lv02d_joystick_enable(struct lis3lv02d *lis3) 651 { 652 struct input_dev *input_dev; 653 int err; 654 int max_val, fuzz, flat; 655 int btns[] = {BTN_X, BTN_Y, BTN_Z}; 656 657 if (lis3->idev) 658 return -EINVAL; 659 660 lis3->idev = input_allocate_polled_device(); 661 if (!lis3->idev) 662 return -ENOMEM; 663 664 lis3->idev->poll = lis3lv02d_joystick_poll; 665 lis3->idev->open = lis3lv02d_joystick_open; 666 lis3->idev->close = lis3lv02d_joystick_close; 667 lis3->idev->poll_interval = MDPS_POLL_INTERVAL; 668 lis3->idev->poll_interval_min = MDPS_POLL_MIN; 669 lis3->idev->poll_interval_max = MDPS_POLL_MAX; 670 lis3->idev->private = lis3; 671 input_dev = lis3->idev->input; 672 673 input_dev->name = "ST LIS3LV02DL Accelerometer"; 674 input_dev->phys = DRIVER_NAME "/input0"; 675 input_dev->id.bustype = BUS_HOST; 676 input_dev->id.vendor = 0; 677 input_dev->dev.parent = &lis3->pdev->dev; 678 679 set_bit(EV_ABS, input_dev->evbit); 680 max_val = (lis3->mdps_max_val * lis3->scale) / LIS3_ACCURACY; 681 if (lis3->whoami == WAI_12B) { 682 fuzz = LIS3_DEFAULT_FUZZ_12B; 683 flat = LIS3_DEFAULT_FLAT_12B; 684 } else { 685 fuzz = LIS3_DEFAULT_FUZZ_8B; 686 flat = LIS3_DEFAULT_FLAT_8B; 687 } 688 fuzz = (fuzz * lis3->scale) / LIS3_ACCURACY; 689 flat = (flat * lis3->scale) / LIS3_ACCURACY; 690 691 input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat); 692 input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat); 693 input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat); 694 695 lis3->mapped_btns[0] = lis3lv02d_get_axis(abs(lis3->ac.x), btns); 696 lis3->mapped_btns[1] = lis3lv02d_get_axis(abs(lis3->ac.y), btns); 697 lis3->mapped_btns[2] = lis3lv02d_get_axis(abs(lis3->ac.z), btns); 698 699 err = input_register_polled_device(lis3->idev); 700 if (err) { 701 input_free_polled_device(lis3->idev); 702 lis3->idev = NULL; 703 } 704 705 return err; 706 } 707 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable); 708 709 void lis3lv02d_joystick_disable(struct lis3lv02d *lis3) 710 { 711 if (lis3->irq) 712 free_irq(lis3->irq, lis3); 713 if (lis3->pdata && lis3->pdata->irq2) 714 free_irq(lis3->pdata->irq2, lis3); 715 716 if (!lis3->idev) 717 return; 718 719 if (lis3->irq) 720 misc_deregister(&lis3->miscdev); 721 input_unregister_polled_device(lis3->idev); 722 input_free_polled_device(lis3->idev); 723 lis3->idev = NULL; 724 } 725 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable); 726 727 /* Sysfs stuff */ 728 static void lis3lv02d_sysfs_poweron(struct lis3lv02d *lis3) 729 { 730 /* 731 * SYSFS functions are fast visitors so put-call 732 * immediately after the get-call. However, keep 733 * chip running for a while and schedule delayed 734 * suspend. This way periodic sysfs calls doesn't 735 * suffer from relatively long power up time. 736 */ 737 738 if (lis3->pm_dev) { 739 pm_runtime_get_sync(lis3->pm_dev); 740 pm_runtime_put_noidle(lis3->pm_dev); 741 pm_schedule_suspend(lis3->pm_dev, LIS3_SYSFS_POWERDOWN_DELAY); 742 } 743 } 744 745 static ssize_t lis3lv02d_selftest_show(struct device *dev, 746 struct device_attribute *attr, char *buf) 747 { 748 struct lis3lv02d *lis3 = dev_get_drvdata(dev); 749 s16 values[3]; 750 751 static const char ok[] = "OK"; 752 static const char fail[] = "FAIL"; 753 static const char irq[] = "FAIL_IRQ"; 754 const char *res; 755 756 lis3lv02d_sysfs_poweron(lis3); 757 switch (lis3lv02d_selftest(lis3, values)) { 758 case SELFTEST_FAIL: 759 res = fail; 760 break; 761 case SELFTEST_IRQ: 762 res = irq; 763 break; 764 case SELFTEST_OK: 765 default: 766 res = ok; 767 break; 768 } 769 return sprintf(buf, "%s %d %d %d\n", res, 770 values[0], values[1], values[2]); 771 } 772 773 static ssize_t lis3lv02d_position_show(struct device *dev, 774 struct device_attribute *attr, char *buf) 775 { 776 struct lis3lv02d *lis3 = dev_get_drvdata(dev); 777 int x, y, z; 778 779 lis3lv02d_sysfs_poweron(lis3); 780 mutex_lock(&lis3->mutex); 781 lis3lv02d_get_xyz(lis3, &x, &y, &z); 782 mutex_unlock(&lis3->mutex); 783 return sprintf(buf, "(%d,%d,%d)\n", x, y, z); 784 } 785 786 static ssize_t lis3lv02d_rate_show(struct device *dev, 787 struct device_attribute *attr, char *buf) 788 { 789 struct lis3lv02d *lis3 = dev_get_drvdata(dev); 790 791 lis3lv02d_sysfs_poweron(lis3); 792 return sprintf(buf, "%d\n", lis3lv02d_get_odr(lis3)); 793 } 794 795 static ssize_t lis3lv02d_rate_set(struct device *dev, 796 struct device_attribute *attr, const char *buf, 797 size_t count) 798 { 799 struct lis3lv02d *lis3 = dev_get_drvdata(dev); 800 unsigned long rate; 801 802 if (strict_strtoul(buf, 0, &rate)) 803 return -EINVAL; 804 805 lis3lv02d_sysfs_poweron(lis3); 806 if (lis3lv02d_set_odr(lis3, rate)) 807 return -EINVAL; 808 809 return count; 810 } 811 812 static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL); 813 static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL); 814 static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show, 815 lis3lv02d_rate_set); 816 817 static struct attribute *lis3lv02d_attributes[] = { 818 &dev_attr_selftest.attr, 819 &dev_attr_position.attr, 820 &dev_attr_rate.attr, 821 NULL 822 }; 823 824 static struct attribute_group lis3lv02d_attribute_group = { 825 .attrs = lis3lv02d_attributes 826 }; 827 828 829 static int lis3lv02d_add_fs(struct lis3lv02d *lis3) 830 { 831 lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0); 832 if (IS_ERR(lis3->pdev)) 833 return PTR_ERR(lis3->pdev); 834 835 platform_set_drvdata(lis3->pdev, lis3); 836 return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group); 837 } 838 839 int lis3lv02d_remove_fs(struct lis3lv02d *lis3) 840 { 841 sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group); 842 platform_device_unregister(lis3->pdev); 843 if (lis3->pm_dev) { 844 /* Barrier after the sysfs remove */ 845 pm_runtime_barrier(lis3->pm_dev); 846 847 /* SYSFS may have left chip running. Turn off if necessary */ 848 if (!pm_runtime_suspended(lis3->pm_dev)) 849 lis3lv02d_poweroff(lis3); 850 851 pm_runtime_disable(lis3->pm_dev); 852 pm_runtime_set_suspended(lis3->pm_dev); 853 } 854 kfree(lis3->reg_cache); 855 return 0; 856 } 857 EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs); 858 859 static void lis3lv02d_8b_configure(struct lis3lv02d *lis3, 860 struct lis3lv02d_platform_data *p) 861 { 862 int err; 863 int ctrl2 = p->hipass_ctrl; 864 865 if (p->click_flags) { 866 lis3->write(lis3, CLICK_CFG, p->click_flags); 867 lis3->write(lis3, CLICK_TIMELIMIT, p->click_time_limit); 868 lis3->write(lis3, CLICK_LATENCY, p->click_latency); 869 lis3->write(lis3, CLICK_WINDOW, p->click_window); 870 lis3->write(lis3, CLICK_THSZ, p->click_thresh_z & 0xf); 871 lis3->write(lis3, CLICK_THSY_X, 872 (p->click_thresh_x & 0xf) | 873 (p->click_thresh_y << 4)); 874 875 if (lis3->idev) { 876 struct input_dev *input_dev = lis3->idev->input; 877 input_set_capability(input_dev, EV_KEY, BTN_X); 878 input_set_capability(input_dev, EV_KEY, BTN_Y); 879 input_set_capability(input_dev, EV_KEY, BTN_Z); 880 } 881 } 882 883 if (p->wakeup_flags) { 884 lis3->write(lis3, FF_WU_CFG_1, p->wakeup_flags); 885 lis3->write(lis3, FF_WU_THS_1, p->wakeup_thresh & 0x7f); 886 /* pdata value + 1 to keep this backward compatible*/ 887 lis3->write(lis3, FF_WU_DURATION_1, p->duration1 + 1); 888 ctrl2 ^= HP_FF_WU1; /* Xor to keep compatible with old pdata*/ 889 } 890 891 if (p->wakeup_flags2) { 892 lis3->write(lis3, FF_WU_CFG_2, p->wakeup_flags2); 893 lis3->write(lis3, FF_WU_THS_2, p->wakeup_thresh2 & 0x7f); 894 /* pdata value + 1 to keep this backward compatible*/ 895 lis3->write(lis3, FF_WU_DURATION_2, p->duration2 + 1); 896 ctrl2 ^= HP_FF_WU2; /* Xor to keep compatible with old pdata*/ 897 } 898 /* Configure hipass filters */ 899 lis3->write(lis3, CTRL_REG2, ctrl2); 900 901 if (p->irq2) { 902 err = request_threaded_irq(p->irq2, 903 NULL, 904 lis302dl_interrupt_thread2_8b, 905 IRQF_TRIGGER_RISING | IRQF_ONESHOT | 906 (p->irq_flags2 & IRQF_TRIGGER_MASK), 907 DRIVER_NAME, lis3); 908 if (err < 0) 909 pr_err("No second IRQ. Limited functionality\n"); 910 } 911 } 912 913 /* 914 * Initialise the accelerometer and the various subsystems. 915 * Should be rather independent of the bus system. 916 */ 917 int lis3lv02d_init_device(struct lis3lv02d *lis3) 918 { 919 int err; 920 irq_handler_t thread_fn; 921 int irq_flags = 0; 922 923 lis3->whoami = lis3lv02d_read_8(lis3, WHO_AM_I); 924 925 switch (lis3->whoami) { 926 case WAI_12B: 927 pr_info("12 bits sensor found\n"); 928 lis3->read_data = lis3lv02d_read_12; 929 lis3->mdps_max_val = 2048; 930 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_12B; 931 lis3->odrs = lis3_12_rates; 932 lis3->odr_mask = CTRL1_DF0 | CTRL1_DF1; 933 lis3->scale = LIS3_SENSITIVITY_12B; 934 lis3->regs = lis3_wai12_regs; 935 lis3->regs_size = ARRAY_SIZE(lis3_wai12_regs); 936 break; 937 case WAI_8B: 938 pr_info("8 bits sensor found\n"); 939 lis3->read_data = lis3lv02d_read_8; 940 lis3->mdps_max_val = 128; 941 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B; 942 lis3->odrs = lis3_8_rates; 943 lis3->odr_mask = CTRL1_DR; 944 lis3->scale = LIS3_SENSITIVITY_8B; 945 lis3->regs = lis3_wai8_regs; 946 lis3->regs_size = ARRAY_SIZE(lis3_wai8_regs); 947 break; 948 case WAI_3DC: 949 pr_info("8 bits 3DC sensor found\n"); 950 lis3->read_data = lis3lv02d_read_8; 951 lis3->mdps_max_val = 128; 952 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B; 953 lis3->odrs = lis3_3dc_rates; 954 lis3->odr_mask = CTRL1_ODR0|CTRL1_ODR1|CTRL1_ODR2|CTRL1_ODR3; 955 lis3->scale = LIS3_SENSITIVITY_8B; 956 break; 957 default: 958 pr_err("unknown sensor type 0x%X\n", lis3->whoami); 959 return -EINVAL; 960 } 961 962 lis3->reg_cache = kzalloc(max(sizeof(lis3_wai8_regs), 963 sizeof(lis3_wai12_regs)), GFP_KERNEL); 964 965 if (lis3->reg_cache == NULL) { 966 printk(KERN_ERR DRIVER_NAME "out of memory\n"); 967 return -ENOMEM; 968 } 969 970 mutex_init(&lis3->mutex); 971 atomic_set(&lis3->wake_thread, 0); 972 973 lis3lv02d_add_fs(lis3); 974 err = lis3lv02d_poweron(lis3); 975 if (err) { 976 lis3lv02d_remove_fs(lis3); 977 return err; 978 } 979 980 if (lis3->pm_dev) { 981 pm_runtime_set_active(lis3->pm_dev); 982 pm_runtime_enable(lis3->pm_dev); 983 } 984 985 if (lis3lv02d_joystick_enable(lis3)) 986 pr_err("joystick initialization failed\n"); 987 988 /* passing in platform specific data is purely optional and only 989 * used by the SPI transport layer at the moment */ 990 if (lis3->pdata) { 991 struct lis3lv02d_platform_data *p = lis3->pdata; 992 993 if (lis3->whoami == WAI_8B) 994 lis3lv02d_8b_configure(lis3, p); 995 996 irq_flags = p->irq_flags1 & IRQF_TRIGGER_MASK; 997 998 lis3->irq_cfg = p->irq_cfg; 999 if (p->irq_cfg) 1000 lis3->write(lis3, CTRL_REG3, p->irq_cfg); 1001 1002 if (p->default_rate) 1003 lis3lv02d_set_odr(lis3, p->default_rate); 1004 } 1005 1006 /* bail if we did not get an IRQ from the bus layer */ 1007 if (!lis3->irq) { 1008 pr_debug("No IRQ. Disabling /dev/freefall\n"); 1009 goto out; 1010 } 1011 1012 /* 1013 * The sensor can generate interrupts for free-fall and direction 1014 * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep 1015 * the things simple and _fast_ we activate it only for free-fall, so 1016 * no need to read register (very slow with ACPI). For the same reason, 1017 * we forbid shared interrupts. 1018 * 1019 * IRQF_TRIGGER_RISING seems pointless on HP laptops because the 1020 * io-apic is not configurable (and generates a warning) but I keep it 1021 * in case of support for other hardware. 1022 */ 1023 if (lis3->pdata && lis3->whoami == WAI_8B) 1024 thread_fn = lis302dl_interrupt_thread1_8b; 1025 else 1026 thread_fn = NULL; 1027 1028 err = request_threaded_irq(lis3->irq, lis302dl_interrupt, 1029 thread_fn, 1030 IRQF_TRIGGER_RISING | IRQF_ONESHOT | 1031 irq_flags, 1032 DRIVER_NAME, lis3); 1033 1034 if (err < 0) { 1035 pr_err("Cannot get IRQ\n"); 1036 goto out; 1037 } 1038 1039 lis3->miscdev.minor = MISC_DYNAMIC_MINOR; 1040 lis3->miscdev.name = "freefall"; 1041 lis3->miscdev.fops = &lis3lv02d_misc_fops; 1042 1043 if (misc_register(&lis3->miscdev)) 1044 pr_err("misc_register failed\n"); 1045 out: 1046 return 0; 1047 } 1048 EXPORT_SYMBOL_GPL(lis3lv02d_init_device); 1049 1050 MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver"); 1051 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek"); 1052 MODULE_LICENSE("GPL"); 1053