lis3lv02d.c revision 05faadcf59507e8eea57ffbeea9cbb14c9a2ab3d
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 88struct lis3lv02d lis3_dev = { 89 .misc_wait = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait), 90}; 91EXPORT_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 */ 96static 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 109static struct kernel_param_ops param_ops_axis = { 110 .set = param_set_axis, 111 .get = param_get_int, 112}; 113 114module_param_array_named(axes, lis3_dev.ac.as_array, axis, NULL, 0644); 115MODULE_PARM_DESC(axes, "Axis-mapping for x,y,z directions"); 116 117static 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 126static 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 */ 143static 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 */ 160static 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_dev.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 */ 193static int lis3_12_rates[4] = {40, 160, 640, 2560}; 194static int lis3_8_rates[2] = {100, 400}; 195static int lis3_3dc_rates[16] = {0, 1, 10, 25, 50, 100, 200, 400, 1600, 5000}; 196 197/* ODR is Output Data Rate */ 198static int lis3lv02d_get_odr(void) 199{ 200 u8 ctrl; 201 int shift; 202 203 lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl); 204 ctrl &= lis3_dev.odr_mask; 205 shift = ffs(lis3_dev.odr_mask) - 1; 206 return lis3_dev.odrs[(ctrl >> shift)]; 207} 208 209static int lis3lv02d_set_odr(int rate) 210{ 211 u8 ctrl; 212 int i, len, shift; 213 214 if (!rate) 215 return -EINVAL; 216 217 lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl); 218 ctrl &= ~lis3_dev.odr_mask; 219 len = 1 << hweight_long(lis3_dev.odr_mask); /* # of possible values */ 220 shift = ffs(lis3_dev.odr_mask) - 1; 221 222 for (i = 0; i < len; i++) 223 if (lis3_dev.odrs[i] == rate) { 224 lis3_dev.write(&lis3_dev, CTRL_REG1, 225 ctrl | (i << shift)); 226 return 0; 227 } 228 return -EINVAL; 229} 230 231static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3]) 232{ 233 u8 ctlreg, reg; 234 s16 x, y, z; 235 u8 selftest; 236 int ret; 237 u8 ctrl_reg_data; 238 unsigned char irq_cfg; 239 240 mutex_lock(&lis3->mutex); 241 242 irq_cfg = lis3->irq_cfg; 243 if (lis3_dev.whoami == WAI_8B) { 244 lis3->data_ready_count[IRQ_LINE0] = 0; 245 lis3->data_ready_count[IRQ_LINE1] = 0; 246 247 /* Change interrupt cfg to data ready for selftest */ 248 atomic_inc(&lis3_dev.wake_thread); 249 lis3->irq_cfg = LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY; 250 lis3->read(lis3, CTRL_REG3, &ctrl_reg_data); 251 lis3->write(lis3, CTRL_REG3, (ctrl_reg_data & 252 ~(LIS3_IRQ1_MASK | LIS3_IRQ2_MASK)) | 253 (LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY)); 254 } 255 256 if (lis3_dev.whoami == WAI_3DC) { 257 ctlreg = CTRL_REG4; 258 selftest = CTRL4_ST0; 259 } else { 260 ctlreg = CTRL_REG1; 261 if (lis3_dev.whoami == WAI_12B) 262 selftest = CTRL1_ST; 263 else 264 selftest = CTRL1_STP; 265 } 266 267 lis3->read(lis3, ctlreg, ®); 268 lis3->write(lis3, ctlreg, (reg | selftest)); 269 msleep(lis3->pwron_delay / lis3lv02d_get_odr()); 270 271 /* Read directly to avoid axis remap */ 272 x = lis3->read_data(lis3, OUTX); 273 y = lis3->read_data(lis3, OUTY); 274 z = lis3->read_data(lis3, OUTZ); 275 276 /* back to normal settings */ 277 lis3->write(lis3, ctlreg, reg); 278 msleep(lis3->pwron_delay / lis3lv02d_get_odr()); 279 280 results[0] = x - lis3->read_data(lis3, OUTX); 281 results[1] = y - lis3->read_data(lis3, OUTY); 282 results[2] = z - lis3->read_data(lis3, OUTZ); 283 284 ret = 0; 285 286 if (lis3_dev.whoami == WAI_8B) { 287 /* Restore original interrupt configuration */ 288 atomic_dec(&lis3_dev.wake_thread); 289 lis3->write(lis3, CTRL_REG3, ctrl_reg_data); 290 lis3->irq_cfg = irq_cfg; 291 292 if ((irq_cfg & LIS3_IRQ1_MASK) && 293 lis3->data_ready_count[IRQ_LINE0] < 2) { 294 ret = SELFTEST_IRQ; 295 goto fail; 296 } 297 298 if ((irq_cfg & LIS3_IRQ2_MASK) && 299 lis3->data_ready_count[IRQ_LINE1] < 2) { 300 ret = SELFTEST_IRQ; 301 goto fail; 302 } 303 } 304 305 if (lis3->pdata) { 306 int i; 307 for (i = 0; i < 3; i++) { 308 /* Check against selftest acceptance limits */ 309 if ((results[i] < lis3->pdata->st_min_limits[i]) || 310 (results[i] > lis3->pdata->st_max_limits[i])) { 311 ret = SELFTEST_FAIL; 312 goto fail; 313 } 314 } 315 } 316 317 /* test passed */ 318fail: 319 mutex_unlock(&lis3->mutex); 320 return ret; 321} 322 323/* 324 * Order of registers in the list affects to order of the restore process. 325 * Perhaps it is a good idea to set interrupt enable register as a last one 326 * after all other configurations 327 */ 328static u8 lis3_wai8_regs[] = { FF_WU_CFG_1, FF_WU_THS_1, FF_WU_DURATION_1, 329 FF_WU_CFG_2, FF_WU_THS_2, FF_WU_DURATION_2, 330 CLICK_CFG, CLICK_SRC, CLICK_THSY_X, CLICK_THSZ, 331 CLICK_TIMELIMIT, CLICK_LATENCY, CLICK_WINDOW, 332 CTRL_REG1, CTRL_REG2, CTRL_REG3}; 333 334static u8 lis3_wai12_regs[] = {FF_WU_CFG, FF_WU_THS_L, FF_WU_THS_H, 335 FF_WU_DURATION, DD_CFG, DD_THSI_L, DD_THSI_H, 336 DD_THSE_L, DD_THSE_H, 337 CTRL_REG1, CTRL_REG3, CTRL_REG2}; 338 339static inline void lis3_context_save(struct lis3lv02d *lis3) 340{ 341 int i; 342 for (i = 0; i < lis3->regs_size; i++) 343 lis3->read(lis3, lis3->regs[i], &lis3->reg_cache[i]); 344 lis3->regs_stored = true; 345} 346 347static inline void lis3_context_restore(struct lis3lv02d *lis3) 348{ 349 int i; 350 if (lis3->regs_stored) 351 for (i = 0; i < lis3->regs_size; i++) 352 lis3->write(lis3, lis3->regs[i], lis3->reg_cache[i]); 353} 354 355void lis3lv02d_poweroff(struct lis3lv02d *lis3) 356{ 357 if (lis3->reg_ctrl) 358 lis3_context_save(lis3); 359 /* disable X,Y,Z axis and power down */ 360 lis3->write(lis3, CTRL_REG1, 0x00); 361 if (lis3->reg_ctrl) 362 lis3->reg_ctrl(lis3, LIS3_REG_OFF); 363} 364EXPORT_SYMBOL_GPL(lis3lv02d_poweroff); 365 366void lis3lv02d_poweron(struct lis3lv02d *lis3) 367{ 368 u8 reg; 369 370 lis3->init(lis3); 371 372 /* 373 * Common configuration 374 * BDU: (12 bits sensors only) LSB and MSB values are not updated until 375 * both have been read. So the value read will always be correct. 376 * Set BOOT bit to refresh factory tuning values. 377 */ 378 if (lis3->pdata) { 379 lis3->read(lis3, CTRL_REG2, ®); 380 if (lis3->whoami == WAI_12B) 381 reg |= CTRL2_BDU | CTRL2_BOOT; 382 else 383 reg |= CTRL2_BOOT_8B; 384 lis3->write(lis3, CTRL_REG2, reg); 385 } 386 387 /* LIS3 power on delay is quite long */ 388 msleep(lis3->pwron_delay / lis3lv02d_get_odr()); 389 390 if (lis3->reg_ctrl) 391 lis3_context_restore(lis3); 392} 393EXPORT_SYMBOL_GPL(lis3lv02d_poweron); 394 395 396static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev) 397{ 398 int x, y, z; 399 400 mutex_lock(&lis3_dev.mutex); 401 lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z); 402 input_report_abs(pidev->input, ABS_X, x); 403 input_report_abs(pidev->input, ABS_Y, y); 404 input_report_abs(pidev->input, ABS_Z, z); 405 input_sync(pidev->input); 406 mutex_unlock(&lis3_dev.mutex); 407} 408 409static void lis3lv02d_joystick_open(struct input_polled_dev *pidev) 410{ 411 if (lis3_dev.pm_dev) 412 pm_runtime_get_sync(lis3_dev.pm_dev); 413 414 if (lis3_dev.pdata && lis3_dev.whoami == WAI_8B && lis3_dev.idev) 415 atomic_set(&lis3_dev.wake_thread, 1); 416 /* 417 * Update coordinates for the case where poll interval is 0 and 418 * the chip in running purely under interrupt control 419 */ 420 lis3lv02d_joystick_poll(pidev); 421} 422 423static void lis3lv02d_joystick_close(struct input_polled_dev *pidev) 424{ 425 atomic_set(&lis3_dev.wake_thread, 0); 426 if (lis3_dev.pm_dev) 427 pm_runtime_put(lis3_dev.pm_dev); 428} 429 430static irqreturn_t lis302dl_interrupt(int irq, void *dummy) 431{ 432 if (!test_bit(0, &lis3_dev.misc_opened)) 433 goto out; 434 435 /* 436 * Be careful: on some HP laptops the bios force DD when on battery and 437 * the lid is closed. This leads to interrupts as soon as a little move 438 * is done. 439 */ 440 atomic_inc(&lis3_dev.count); 441 442 wake_up_interruptible(&lis3_dev.misc_wait); 443 kill_fasync(&lis3_dev.async_queue, SIGIO, POLL_IN); 444out: 445 if (atomic_read(&lis3_dev.wake_thread)) 446 return IRQ_WAKE_THREAD; 447 return IRQ_HANDLED; 448} 449 450static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3) 451{ 452 struct input_dev *dev = lis3->idev->input; 453 u8 click_src; 454 455 mutex_lock(&lis3->mutex); 456 lis3->read(lis3, CLICK_SRC, &click_src); 457 458 if (click_src & CLICK_SINGLE_X) { 459 input_report_key(dev, lis3->mapped_btns[0], 1); 460 input_report_key(dev, lis3->mapped_btns[0], 0); 461 } 462 463 if (click_src & CLICK_SINGLE_Y) { 464 input_report_key(dev, lis3->mapped_btns[1], 1); 465 input_report_key(dev, lis3->mapped_btns[1], 0); 466 } 467 468 if (click_src & CLICK_SINGLE_Z) { 469 input_report_key(dev, lis3->mapped_btns[2], 1); 470 input_report_key(dev, lis3->mapped_btns[2], 0); 471 } 472 input_sync(dev); 473 mutex_unlock(&lis3->mutex); 474} 475 476static inline void lis302dl_data_ready(struct lis3lv02d *lis3, int index) 477{ 478 int dummy; 479 480 /* Dummy read to ack interrupt */ 481 lis3lv02d_get_xyz(lis3, &dummy, &dummy, &dummy); 482 lis3->data_ready_count[index]++; 483} 484 485static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data) 486{ 487 struct lis3lv02d *lis3 = data; 488 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ1_MASK; 489 490 if (irq_cfg == LIS3_IRQ1_CLICK) 491 lis302dl_interrupt_handle_click(lis3); 492 else if (unlikely(irq_cfg == LIS3_IRQ1_DATA_READY)) 493 lis302dl_data_ready(lis3, IRQ_LINE0); 494 else 495 lis3lv02d_joystick_poll(lis3->idev); 496 497 return IRQ_HANDLED; 498} 499 500static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data) 501{ 502 struct lis3lv02d *lis3 = data; 503 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ2_MASK; 504 505 if (irq_cfg == LIS3_IRQ2_CLICK) 506 lis302dl_interrupt_handle_click(lis3); 507 else if (unlikely(irq_cfg == LIS3_IRQ2_DATA_READY)) 508 lis302dl_data_ready(lis3, IRQ_LINE1); 509 else 510 lis3lv02d_joystick_poll(lis3->idev); 511 512 return IRQ_HANDLED; 513} 514 515static int lis3lv02d_misc_open(struct inode *inode, struct file *file) 516{ 517 if (test_and_set_bit(0, &lis3_dev.misc_opened)) 518 return -EBUSY; /* already open */ 519 520 if (lis3_dev.pm_dev) 521 pm_runtime_get_sync(lis3_dev.pm_dev); 522 523 atomic_set(&lis3_dev.count, 0); 524 return 0; 525} 526 527static int lis3lv02d_misc_release(struct inode *inode, struct file *file) 528{ 529 fasync_helper(-1, file, 0, &lis3_dev.async_queue); 530 clear_bit(0, &lis3_dev.misc_opened); /* release the device */ 531 if (lis3_dev.pm_dev) 532 pm_runtime_put(lis3_dev.pm_dev); 533 return 0; 534} 535 536static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf, 537 size_t count, loff_t *pos) 538{ 539 DECLARE_WAITQUEUE(wait, current); 540 u32 data; 541 unsigned char byte_data; 542 ssize_t retval = 1; 543 544 if (count < 1) 545 return -EINVAL; 546 547 add_wait_queue(&lis3_dev.misc_wait, &wait); 548 while (true) { 549 set_current_state(TASK_INTERRUPTIBLE); 550 data = atomic_xchg(&lis3_dev.count, 0); 551 if (data) 552 break; 553 554 if (file->f_flags & O_NONBLOCK) { 555 retval = -EAGAIN; 556 goto out; 557 } 558 559 if (signal_pending(current)) { 560 retval = -ERESTARTSYS; 561 goto out; 562 } 563 564 schedule(); 565 } 566 567 if (data < 255) 568 byte_data = data; 569 else 570 byte_data = 255; 571 572 /* make sure we are not going into copy_to_user() with 573 * TASK_INTERRUPTIBLE state */ 574 set_current_state(TASK_RUNNING); 575 if (copy_to_user(buf, &byte_data, sizeof(byte_data))) 576 retval = -EFAULT; 577 578out: 579 __set_current_state(TASK_RUNNING); 580 remove_wait_queue(&lis3_dev.misc_wait, &wait); 581 582 return retval; 583} 584 585static unsigned int lis3lv02d_misc_poll(struct file *file, poll_table *wait) 586{ 587 poll_wait(file, &lis3_dev.misc_wait, wait); 588 if (atomic_read(&lis3_dev.count)) 589 return POLLIN | POLLRDNORM; 590 return 0; 591} 592 593static int lis3lv02d_misc_fasync(int fd, struct file *file, int on) 594{ 595 return fasync_helper(fd, file, on, &lis3_dev.async_queue); 596} 597 598static const struct file_operations lis3lv02d_misc_fops = { 599 .owner = THIS_MODULE, 600 .llseek = no_llseek, 601 .read = lis3lv02d_misc_read, 602 .open = lis3lv02d_misc_open, 603 .release = lis3lv02d_misc_release, 604 .poll = lis3lv02d_misc_poll, 605 .fasync = lis3lv02d_misc_fasync, 606}; 607 608static struct miscdevice lis3lv02d_misc_device = { 609 .minor = MISC_DYNAMIC_MINOR, 610 .name = "freefall", 611 .fops = &lis3lv02d_misc_fops, 612}; 613 614int lis3lv02d_joystick_enable(void) 615{ 616 struct input_dev *input_dev; 617 int err; 618 int max_val, fuzz, flat; 619 int btns[] = {BTN_X, BTN_Y, BTN_Z}; 620 621 if (lis3_dev.idev) 622 return -EINVAL; 623 624 lis3_dev.idev = input_allocate_polled_device(); 625 if (!lis3_dev.idev) 626 return -ENOMEM; 627 628 lis3_dev.idev->poll = lis3lv02d_joystick_poll; 629 lis3_dev.idev->open = lis3lv02d_joystick_open; 630 lis3_dev.idev->close = lis3lv02d_joystick_close; 631 lis3_dev.idev->poll_interval = MDPS_POLL_INTERVAL; 632 lis3_dev.idev->poll_interval_min = MDPS_POLL_MIN; 633 lis3_dev.idev->poll_interval_max = MDPS_POLL_MAX; 634 input_dev = lis3_dev.idev->input; 635 636 input_dev->name = "ST LIS3LV02DL Accelerometer"; 637 input_dev->phys = DRIVER_NAME "/input0"; 638 input_dev->id.bustype = BUS_HOST; 639 input_dev->id.vendor = 0; 640 input_dev->dev.parent = &lis3_dev.pdev->dev; 641 642 set_bit(EV_ABS, input_dev->evbit); 643 max_val = (lis3_dev.mdps_max_val * lis3_dev.scale) / LIS3_ACCURACY; 644 if (lis3_dev.whoami == WAI_12B) { 645 fuzz = LIS3_DEFAULT_FUZZ_12B; 646 flat = LIS3_DEFAULT_FLAT_12B; 647 } else { 648 fuzz = LIS3_DEFAULT_FUZZ_8B; 649 flat = LIS3_DEFAULT_FLAT_8B; 650 } 651 fuzz = (fuzz * lis3_dev.scale) / LIS3_ACCURACY; 652 flat = (flat * lis3_dev.scale) / LIS3_ACCURACY; 653 654 input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat); 655 input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat); 656 input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat); 657 658 lis3_dev.mapped_btns[0] = lis3lv02d_get_axis(abs(lis3_dev.ac.x), btns); 659 lis3_dev.mapped_btns[1] = lis3lv02d_get_axis(abs(lis3_dev.ac.y), btns); 660 lis3_dev.mapped_btns[2] = lis3lv02d_get_axis(abs(lis3_dev.ac.z), btns); 661 662 err = input_register_polled_device(lis3_dev.idev); 663 if (err) { 664 input_free_polled_device(lis3_dev.idev); 665 lis3_dev.idev = NULL; 666 } 667 668 return err; 669} 670EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable); 671 672void lis3lv02d_joystick_disable(void) 673{ 674 if (lis3_dev.irq) 675 free_irq(lis3_dev.irq, &lis3_dev); 676 if (lis3_dev.pdata && lis3_dev.pdata->irq2) 677 free_irq(lis3_dev.pdata->irq2, &lis3_dev); 678 679 if (!lis3_dev.idev) 680 return; 681 682 if (lis3_dev.irq) 683 misc_deregister(&lis3lv02d_misc_device); 684 input_unregister_polled_device(lis3_dev.idev); 685 input_free_polled_device(lis3_dev.idev); 686 lis3_dev.idev = NULL; 687} 688EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable); 689 690/* Sysfs stuff */ 691static void lis3lv02d_sysfs_poweron(struct lis3lv02d *lis3) 692{ 693 /* 694 * SYSFS functions are fast visitors so put-call 695 * immediately after the get-call. However, keep 696 * chip running for a while and schedule delayed 697 * suspend. This way periodic sysfs calls doesn't 698 * suffer from relatively long power up time. 699 */ 700 701 if (lis3->pm_dev) { 702 pm_runtime_get_sync(lis3->pm_dev); 703 pm_runtime_put_noidle(lis3->pm_dev); 704 pm_schedule_suspend(lis3->pm_dev, LIS3_SYSFS_POWERDOWN_DELAY); 705 } 706} 707 708static ssize_t lis3lv02d_selftest_show(struct device *dev, 709 struct device_attribute *attr, char *buf) 710{ 711 s16 values[3]; 712 713 static const char ok[] = "OK"; 714 static const char fail[] = "FAIL"; 715 static const char irq[] = "FAIL_IRQ"; 716 const char *res; 717 718 lis3lv02d_sysfs_poweron(&lis3_dev); 719 switch (lis3lv02d_selftest(&lis3_dev, values)) { 720 case SELFTEST_FAIL: 721 res = fail; 722 break; 723 case SELFTEST_IRQ: 724 res = irq; 725 break; 726 case SELFTEST_OK: 727 default: 728 res = ok; 729 break; 730 } 731 return sprintf(buf, "%s %d %d %d\n", res, 732 values[0], values[1], values[2]); 733} 734 735static ssize_t lis3lv02d_position_show(struct device *dev, 736 struct device_attribute *attr, char *buf) 737{ 738 int x, y, z; 739 740 lis3lv02d_sysfs_poweron(&lis3_dev); 741 mutex_lock(&lis3_dev.mutex); 742 lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z); 743 mutex_unlock(&lis3_dev.mutex); 744 return sprintf(buf, "(%d,%d,%d)\n", x, y, z); 745} 746 747static ssize_t lis3lv02d_rate_show(struct device *dev, 748 struct device_attribute *attr, char *buf) 749{ 750 lis3lv02d_sysfs_poweron(&lis3_dev); 751 return sprintf(buf, "%d\n", lis3lv02d_get_odr()); 752} 753 754static ssize_t lis3lv02d_rate_set(struct device *dev, 755 struct device_attribute *attr, const char *buf, 756 size_t count) 757{ 758 unsigned long rate; 759 760 if (strict_strtoul(buf, 0, &rate)) 761 return -EINVAL; 762 763 lis3lv02d_sysfs_poweron(&lis3_dev); 764 if (lis3lv02d_set_odr(rate)) 765 return -EINVAL; 766 767 return count; 768} 769 770static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL); 771static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL); 772static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show, 773 lis3lv02d_rate_set); 774 775static struct attribute *lis3lv02d_attributes[] = { 776 &dev_attr_selftest.attr, 777 &dev_attr_position.attr, 778 &dev_attr_rate.attr, 779 NULL 780}; 781 782static struct attribute_group lis3lv02d_attribute_group = { 783 .attrs = lis3lv02d_attributes 784}; 785 786 787static int lis3lv02d_add_fs(struct lis3lv02d *lis3) 788{ 789 lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0); 790 if (IS_ERR(lis3->pdev)) 791 return PTR_ERR(lis3->pdev); 792 793 return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group); 794} 795 796int lis3lv02d_remove_fs(struct lis3lv02d *lis3) 797{ 798 sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group); 799 platform_device_unregister(lis3->pdev); 800 if (lis3->pm_dev) { 801 /* Barrier after the sysfs remove */ 802 pm_runtime_barrier(lis3->pm_dev); 803 804 /* SYSFS may have left chip running. Turn off if necessary */ 805 if (!pm_runtime_suspended(lis3->pm_dev)) 806 lis3lv02d_poweroff(&lis3_dev); 807 808 pm_runtime_disable(lis3->pm_dev); 809 pm_runtime_set_suspended(lis3->pm_dev); 810 } 811 kfree(lis3->reg_cache); 812 return 0; 813} 814EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs); 815 816static void lis3lv02d_8b_configure(struct lis3lv02d *dev, 817 struct lis3lv02d_platform_data *p) 818{ 819 int err; 820 int ctrl2 = p->hipass_ctrl; 821 822 if (p->click_flags) { 823 dev->write(dev, CLICK_CFG, p->click_flags); 824 dev->write(dev, CLICK_TIMELIMIT, p->click_time_limit); 825 dev->write(dev, CLICK_LATENCY, p->click_latency); 826 dev->write(dev, CLICK_WINDOW, p->click_window); 827 dev->write(dev, CLICK_THSZ, p->click_thresh_z & 0xf); 828 dev->write(dev, CLICK_THSY_X, 829 (p->click_thresh_x & 0xf) | 830 (p->click_thresh_y << 4)); 831 832 if (dev->idev) { 833 struct input_dev *input_dev = lis3_dev.idev->input; 834 input_set_capability(input_dev, EV_KEY, BTN_X); 835 input_set_capability(input_dev, EV_KEY, BTN_Y); 836 input_set_capability(input_dev, EV_KEY, BTN_Z); 837 } 838 } 839 840 if (p->wakeup_flags) { 841 dev->write(dev, FF_WU_CFG_1, p->wakeup_flags); 842 dev->write(dev, FF_WU_THS_1, p->wakeup_thresh & 0x7f); 843 /* pdata value + 1 to keep this backward compatible*/ 844 dev->write(dev, FF_WU_DURATION_1, p->duration1 + 1); 845 ctrl2 ^= HP_FF_WU1; /* Xor to keep compatible with old pdata*/ 846 } 847 848 if (p->wakeup_flags2) { 849 dev->write(dev, FF_WU_CFG_2, p->wakeup_flags2); 850 dev->write(dev, FF_WU_THS_2, p->wakeup_thresh2 & 0x7f); 851 /* pdata value + 1 to keep this backward compatible*/ 852 dev->write(dev, FF_WU_DURATION_2, p->duration2 + 1); 853 ctrl2 ^= HP_FF_WU2; /* Xor to keep compatible with old pdata*/ 854 } 855 /* Configure hipass filters */ 856 dev->write(dev, CTRL_REG2, ctrl2); 857 858 if (p->irq2) { 859 err = request_threaded_irq(p->irq2, 860 NULL, 861 lis302dl_interrupt_thread2_8b, 862 IRQF_TRIGGER_RISING | IRQF_ONESHOT | 863 (p->irq_flags2 & IRQF_TRIGGER_MASK), 864 DRIVER_NAME, &lis3_dev); 865 if (err < 0) 866 pr_err("No second IRQ. Limited functionality\n"); 867 } 868} 869 870/* 871 * Initialise the accelerometer and the various subsystems. 872 * Should be rather independent of the bus system. 873 */ 874int lis3lv02d_init_device(struct lis3lv02d *dev) 875{ 876 int err; 877 irq_handler_t thread_fn; 878 int irq_flags = 0; 879 880 dev->whoami = lis3lv02d_read_8(dev, WHO_AM_I); 881 882 switch (dev->whoami) { 883 case WAI_12B: 884 pr_info("12 bits sensor found\n"); 885 dev->read_data = lis3lv02d_read_12; 886 dev->mdps_max_val = 2048; 887 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_12B; 888 dev->odrs = lis3_12_rates; 889 dev->odr_mask = CTRL1_DF0 | CTRL1_DF1; 890 dev->scale = LIS3_SENSITIVITY_12B; 891 dev->regs = lis3_wai12_regs; 892 dev->regs_size = ARRAY_SIZE(lis3_wai12_regs); 893 break; 894 case WAI_8B: 895 pr_info("8 bits sensor found\n"); 896 dev->read_data = lis3lv02d_read_8; 897 dev->mdps_max_val = 128; 898 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_8B; 899 dev->odrs = lis3_8_rates; 900 dev->odr_mask = CTRL1_DR; 901 dev->scale = LIS3_SENSITIVITY_8B; 902 dev->regs = lis3_wai8_regs; 903 dev->regs_size = ARRAY_SIZE(lis3_wai8_regs); 904 break; 905 case WAI_3DC: 906 pr_info("8 bits 3DC sensor found\n"); 907 dev->read_data = lis3lv02d_read_8; 908 dev->mdps_max_val = 128; 909 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_8B; 910 dev->odrs = lis3_3dc_rates; 911 dev->odr_mask = CTRL1_ODR0|CTRL1_ODR1|CTRL1_ODR2|CTRL1_ODR3; 912 dev->scale = LIS3_SENSITIVITY_8B; 913 break; 914 default: 915 pr_err("unknown sensor type 0x%X\n", dev->whoami); 916 return -EINVAL; 917 } 918 919 dev->reg_cache = kzalloc(max(sizeof(lis3_wai8_regs), 920 sizeof(lis3_wai12_regs)), GFP_KERNEL); 921 922 if (dev->reg_cache == NULL) { 923 printk(KERN_ERR DRIVER_NAME "out of memory\n"); 924 return -ENOMEM; 925 } 926 927 mutex_init(&dev->mutex); 928 atomic_set(&dev->wake_thread, 0); 929 930 lis3lv02d_add_fs(dev); 931 lis3lv02d_poweron(dev); 932 933 if (dev->pm_dev) { 934 pm_runtime_set_active(dev->pm_dev); 935 pm_runtime_enable(dev->pm_dev); 936 } 937 938 if (lis3lv02d_joystick_enable()) 939 pr_err("joystick initialization failed\n"); 940 941 /* passing in platform specific data is purely optional and only 942 * used by the SPI transport layer at the moment */ 943 if (dev->pdata) { 944 struct lis3lv02d_platform_data *p = dev->pdata; 945 946 if (dev->whoami == WAI_8B) 947 lis3lv02d_8b_configure(dev, p); 948 949 irq_flags = p->irq_flags1 & IRQF_TRIGGER_MASK; 950 951 dev->irq_cfg = p->irq_cfg; 952 if (p->irq_cfg) 953 dev->write(dev, CTRL_REG3, p->irq_cfg); 954 955 if (p->default_rate) 956 lis3lv02d_set_odr(p->default_rate); 957 } 958 959 /* bail if we did not get an IRQ from the bus layer */ 960 if (!dev->irq) { 961 pr_debug("No IRQ. Disabling /dev/freefall\n"); 962 goto out; 963 } 964 965 /* 966 * The sensor can generate interrupts for free-fall and direction 967 * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep 968 * the things simple and _fast_ we activate it only for free-fall, so 969 * no need to read register (very slow with ACPI). For the same reason, 970 * we forbid shared interrupts. 971 * 972 * IRQF_TRIGGER_RISING seems pointless on HP laptops because the 973 * io-apic is not configurable (and generates a warning) but I keep it 974 * in case of support for other hardware. 975 */ 976 if (dev->pdata && dev->whoami == WAI_8B) 977 thread_fn = lis302dl_interrupt_thread1_8b; 978 else 979 thread_fn = NULL; 980 981 err = request_threaded_irq(dev->irq, lis302dl_interrupt, 982 thread_fn, 983 IRQF_TRIGGER_RISING | IRQF_ONESHOT | 984 irq_flags, 985 DRIVER_NAME, &lis3_dev); 986 987 if (err < 0) { 988 pr_err("Cannot get IRQ\n"); 989 goto out; 990 } 991 992 if (misc_register(&lis3lv02d_misc_device)) 993 pr_err("misc_register failed\n"); 994out: 995 return 0; 996} 997EXPORT_SYMBOL_GPL(lis3lv02d_init_device); 998 999MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver"); 1000MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek"); 1001MODULE_LICENSE("GPL"); 1002