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_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 */ 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(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 } 208 209 static 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 } 230 231 static 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 */ 318 fail: 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 */ 328 static 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}; 333 334 static 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}; 338 339 static 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 } 346 347 static 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 } 354 355 void 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 } 364 EXPORT_SYMBOL_GPL(lis3lv02d_poweroff); 365 366 void 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 lis3->read(lis3, CTRL_REG2, ®); 379 if (lis3->whoami == WAI_12B) 380 reg |= CTRL2_BDU | CTRL2_BOOT; 381 else 382 reg |= CTRL2_BOOT_8B; 383 lis3->write(lis3, CTRL_REG2, reg); 384 385 /* LIS3 power on delay is quite long */ 386 msleep(lis3->pwron_delay / lis3lv02d_get_odr()); 387 388 if (lis3->reg_ctrl) 389 lis3_context_restore(lis3); 390 } 391 EXPORT_SYMBOL_GPL(lis3lv02d_poweron); 392 393 394 static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev) 395 { 396 int x, y, z; 397 398 mutex_lock(&lis3_dev.mutex); 399 lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z); 400 input_report_abs(pidev->input, ABS_X, x); 401 input_report_abs(pidev->input, ABS_Y, y); 402 input_report_abs(pidev->input, ABS_Z, z); 403 input_sync(pidev->input); 404 mutex_unlock(&lis3_dev.mutex); 405 } 406 407 static void lis3lv02d_joystick_open(struct input_polled_dev *pidev) 408 { 409 if (lis3_dev.pm_dev) 410 pm_runtime_get_sync(lis3_dev.pm_dev); 411 412 if (lis3_dev.pdata && lis3_dev.whoami == WAI_8B && lis3_dev.idev) 413 atomic_set(&lis3_dev.wake_thread, 1); 414 /* 415 * Update coordinates for the case where poll interval is 0 and 416 * the chip in running purely under interrupt control 417 */ 418 lis3lv02d_joystick_poll(pidev); 419 } 420 421 static void lis3lv02d_joystick_close(struct input_polled_dev *pidev) 422 { 423 atomic_set(&lis3_dev.wake_thread, 0); 424 if (lis3_dev.pm_dev) 425 pm_runtime_put(lis3_dev.pm_dev); 426 } 427 428 static irqreturn_t lis302dl_interrupt(int irq, void *dummy) 429 { 430 if (!test_bit(0, &lis3_dev.misc_opened)) 431 goto out; 432 433 /* 434 * Be careful: on some HP laptops the bios force DD when on battery and 435 * the lid is closed. This leads to interrupts as soon as a little move 436 * is done. 437 */ 438 atomic_inc(&lis3_dev.count); 439 440 wake_up_interruptible(&lis3_dev.misc_wait); 441 kill_fasync(&lis3_dev.async_queue, SIGIO, POLL_IN); 442 out: 443 if (atomic_read(&lis3_dev.wake_thread)) 444 return IRQ_WAKE_THREAD; 445 return IRQ_HANDLED; 446 } 447 448 static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3) 449 { 450 struct input_dev *dev = lis3->idev->input; 451 u8 click_src; 452 453 mutex_lock(&lis3->mutex); 454 lis3->read(lis3, CLICK_SRC, &click_src); 455 456 if (click_src & CLICK_SINGLE_X) { 457 input_report_key(dev, lis3->mapped_btns[0], 1); 458 input_report_key(dev, lis3->mapped_btns[0], 0); 459 } 460 461 if (click_src & CLICK_SINGLE_Y) { 462 input_report_key(dev, lis3->mapped_btns[1], 1); 463 input_report_key(dev, lis3->mapped_btns[1], 0); 464 } 465 466 if (click_src & CLICK_SINGLE_Z) { 467 input_report_key(dev, lis3->mapped_btns[2], 1); 468 input_report_key(dev, lis3->mapped_btns[2], 0); 469 } 470 input_sync(dev); 471 mutex_unlock(&lis3->mutex); 472 } 473 474 static inline void lis302dl_data_ready(struct lis3lv02d *lis3, int index) 475 { 476 int dummy; 477 478 /* Dummy read to ack interrupt */ 479 lis3lv02d_get_xyz(lis3, &dummy, &dummy, &dummy); 480 lis3->data_ready_count[index]++; 481 } 482 483 static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data) 484 { 485 struct lis3lv02d *lis3 = data; 486 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ1_MASK; 487 488 if (irq_cfg == LIS3_IRQ1_CLICK) 489 lis302dl_interrupt_handle_click(lis3); 490 else if (unlikely(irq_cfg == LIS3_IRQ1_DATA_READY)) 491 lis302dl_data_ready(lis3, IRQ_LINE0); 492 else 493 lis3lv02d_joystick_poll(lis3->idev); 494 495 return IRQ_HANDLED; 496 } 497 498 static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data) 499 { 500 struct lis3lv02d *lis3 = data; 501 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ2_MASK; 502 503 if (irq_cfg == LIS3_IRQ2_CLICK) 504 lis302dl_interrupt_handle_click(lis3); 505 else if (unlikely(irq_cfg == LIS3_IRQ2_DATA_READY)) 506 lis302dl_data_ready(lis3, IRQ_LINE1); 507 else 508 lis3lv02d_joystick_poll(lis3->idev); 509 510 return IRQ_HANDLED; 511 } 512 513 static int lis3lv02d_misc_open(struct inode *inode, struct file *file) 514 { 515 if (test_and_set_bit(0, &lis3_dev.misc_opened)) 516 return -EBUSY; /* already open */ 517 518 if (lis3_dev.pm_dev) 519 pm_runtime_get_sync(lis3_dev.pm_dev); 520 521 atomic_set(&lis3_dev.count, 0); 522 return 0; 523 } 524 525 static int lis3lv02d_misc_release(struct inode *inode, struct file *file) 526 { 527 fasync_helper(-1, file, 0, &lis3_dev.async_queue); 528 clear_bit(0, &lis3_dev.misc_opened); /* release the device */ 529 if (lis3_dev.pm_dev) 530 pm_runtime_put(lis3_dev.pm_dev); 531 return 0; 532 } 533 534 static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf, 535 size_t count, loff_t *pos) 536 { 537 DECLARE_WAITQUEUE(wait, current); 538 u32 data; 539 unsigned char byte_data; 540 ssize_t retval = 1; 541 542 if (count < 1) 543 return -EINVAL; 544 545 add_wait_queue(&lis3_dev.misc_wait, &wait); 546 while (true) { 547 set_current_state(TASK_INTERRUPTIBLE); 548 data = atomic_xchg(&lis3_dev.count, 0); 549 if (data) 550 break; 551 552 if (file->f_flags & O_NONBLOCK) { 553 retval = -EAGAIN; 554 goto out; 555 } 556 557 if (signal_pending(current)) { 558 retval = -ERESTARTSYS; 559 goto out; 560 } 561 562 schedule(); 563 } 564 565 if (data < 255) 566 byte_data = data; 567 else 568 byte_data = 255; 569 570 /* make sure we are not going into copy_to_user() with 571 * TASK_INTERRUPTIBLE state */ 572 set_current_state(TASK_RUNNING); 573 if (copy_to_user(buf, &byte_data, sizeof(byte_data))) 574 retval = -EFAULT; 575 576 out: 577 __set_current_state(TASK_RUNNING); 578 remove_wait_queue(&lis3_dev.misc_wait, &wait); 579 580 return retval; 581 } 582 583 static unsigned int lis3lv02d_misc_poll(struct file *file, poll_table *wait) 584 { 585 poll_wait(file, &lis3_dev.misc_wait, wait); 586 if (atomic_read(&lis3_dev.count)) 587 return POLLIN | POLLRDNORM; 588 return 0; 589 } 590 591 static int lis3lv02d_misc_fasync(int fd, struct file *file, int on) 592 { 593 return fasync_helper(fd, file, on, &lis3_dev.async_queue); 594 } 595 596 static const struct file_operations lis3lv02d_misc_fops = { 597 .owner = THIS_MODULE, 598 .llseek = no_llseek, 599 .read = lis3lv02d_misc_read, 600 .open = lis3lv02d_misc_open, 601 .release = lis3lv02d_misc_release, 602 .poll = lis3lv02d_misc_poll, 603 .fasync = lis3lv02d_misc_fasync, 604 }; 605 606 static struct miscdevice lis3lv02d_misc_device = { 607 .minor = MISC_DYNAMIC_MINOR, 608 .name = "freefall", 609 .fops = &lis3lv02d_misc_fops, 610 }; 611 612 int lis3lv02d_joystick_enable(void) 613 { 614 struct input_dev *input_dev; 615 int err; 616 int max_val, fuzz, flat; 617 int btns[] = {BTN_X, BTN_Y, BTN_Z}; 618 619 if (lis3_dev.idev) 620 return -EINVAL; 621 622 lis3_dev.idev = input_allocate_polled_device(); 623 if (!lis3_dev.idev) 624 return -ENOMEM; 625 626 lis3_dev.idev->poll = lis3lv02d_joystick_poll; 627 lis3_dev.idev->open = lis3lv02d_joystick_open; 628 lis3_dev.idev->close = lis3lv02d_joystick_close; 629 lis3_dev.idev->poll_interval = MDPS_POLL_INTERVAL; 630 lis3_dev.idev->poll_interval_min = MDPS_POLL_MIN; 631 lis3_dev.idev->poll_interval_max = MDPS_POLL_MAX; 632 input_dev = lis3_dev.idev->input; 633 634 input_dev->name = "ST LIS3LV02DL Accelerometer"; 635 input_dev->phys = DRIVER_NAME "/input0"; 636 input_dev->id.bustype = BUS_HOST; 637 input_dev->id.vendor = 0; 638 input_dev->dev.parent = &lis3_dev.pdev->dev; 639 640 set_bit(EV_ABS, input_dev->evbit); 641 max_val = (lis3_dev.mdps_max_val * lis3_dev.scale) / LIS3_ACCURACY; 642 if (lis3_dev.whoami == WAI_12B) { 643 fuzz = LIS3_DEFAULT_FUZZ_12B; 644 flat = LIS3_DEFAULT_FLAT_12B; 645 } else { 646 fuzz = LIS3_DEFAULT_FUZZ_8B; 647 flat = LIS3_DEFAULT_FLAT_8B; 648 } 649 fuzz = (fuzz * lis3_dev.scale) / LIS3_ACCURACY; 650 flat = (flat * lis3_dev.scale) / LIS3_ACCURACY; 651 652 input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat); 653 input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat); 654 input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat); 655 656 lis3_dev.mapped_btns[0] = lis3lv02d_get_axis(abs(lis3_dev.ac.x), btns); 657 lis3_dev.mapped_btns[1] = lis3lv02d_get_axis(abs(lis3_dev.ac.y), btns); 658 lis3_dev.mapped_btns[2] = lis3lv02d_get_axis(abs(lis3_dev.ac.z), btns); 659 660 err = input_register_polled_device(lis3_dev.idev); 661 if (err) { 662 input_free_polled_device(lis3_dev.idev); 663 lis3_dev.idev = NULL; 664 } 665 666 return err; 667 } 668 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable); 669 670 void lis3lv02d_joystick_disable(void) 671 { 672 if (lis3_dev.irq) 673 free_irq(lis3_dev.irq, &lis3_dev); 674 if (lis3_dev.pdata && lis3_dev.pdata->irq2) 675 free_irq(lis3_dev.pdata->irq2, &lis3_dev); 676 677 if (!lis3_dev.idev) 678 return; 679 680 if (lis3_dev.irq) 681 misc_deregister(&lis3lv02d_misc_device); 682 input_unregister_polled_device(lis3_dev.idev); 683 input_free_polled_device(lis3_dev.idev); 684 lis3_dev.idev = NULL; 685 } 686 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable); 687 688 /* Sysfs stuff */ 689 static void lis3lv02d_sysfs_poweron(struct lis3lv02d *lis3) 690 { 691 /* 692 * SYSFS functions are fast visitors so put-call 693 * immediately after the get-call. However, keep 694 * chip running for a while and schedule delayed 695 * suspend. This way periodic sysfs calls doesn't 696 * suffer from relatively long power up time. 697 */ 698 699 if (lis3->pm_dev) { 700 pm_runtime_get_sync(lis3->pm_dev); 701 pm_runtime_put_noidle(lis3->pm_dev); 702 pm_schedule_suspend(lis3->pm_dev, LIS3_SYSFS_POWERDOWN_DELAY); 703 } 704 } 705 706 static ssize_t lis3lv02d_selftest_show(struct device *dev, 707 struct device_attribute *attr, char *buf) 708 { 709 s16 values[3]; 710 711 static const char ok[] = "OK"; 712 static const char fail[] = "FAIL"; 713 static const char irq[] = "FAIL_IRQ"; 714 const char *res; 715 716 lis3lv02d_sysfs_poweron(&lis3_dev); 717 switch (lis3lv02d_selftest(&lis3_dev, values)) { 718 case SELFTEST_FAIL: 719 res = fail; 720 break; 721 case SELFTEST_IRQ: 722 res = irq; 723 break; 724 case SELFTEST_OK: 725 default: 726 res = ok; 727 break; 728 } 729 return sprintf(buf, "%s %d %d %d\n", res, 730 values[0], values[1], values[2]); 731 } 732 733 static ssize_t lis3lv02d_position_show(struct device *dev, 734 struct device_attribute *attr, char *buf) 735 { 736 int x, y, z; 737 738 lis3lv02d_sysfs_poweron(&lis3_dev); 739 mutex_lock(&lis3_dev.mutex); 740 lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z); 741 mutex_unlock(&lis3_dev.mutex); 742 return sprintf(buf, "(%d,%d,%d)\n", x, y, z); 743 } 744 745 static ssize_t lis3lv02d_rate_show(struct device *dev, 746 struct device_attribute *attr, char *buf) 747 { 748 lis3lv02d_sysfs_poweron(&lis3_dev); 749 return sprintf(buf, "%d\n", lis3lv02d_get_odr()); 750 } 751 752 static ssize_t lis3lv02d_rate_set(struct device *dev, 753 struct device_attribute *attr, const char *buf, 754 size_t count) 755 { 756 unsigned long rate; 757 758 if (strict_strtoul(buf, 0, &rate)) 759 return -EINVAL; 760 761 lis3lv02d_sysfs_poweron(&lis3_dev); 762 if (lis3lv02d_set_odr(rate)) 763 return -EINVAL; 764 765 return count; 766 } 767 768 static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL); 769 static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL); 770 static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show, 771 lis3lv02d_rate_set); 772 773 static struct attribute *lis3lv02d_attributes[] = { 774 &dev_attr_selftest.attr, 775 &dev_attr_position.attr, 776 &dev_attr_rate.attr, 777 NULL 778 }; 779 780 static struct attribute_group lis3lv02d_attribute_group = { 781 .attrs = lis3lv02d_attributes 782 }; 783 784 785 static int lis3lv02d_add_fs(struct lis3lv02d *lis3) 786 { 787 lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0); 788 if (IS_ERR(lis3->pdev)) 789 return PTR_ERR(lis3->pdev); 790 791 return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group); 792 } 793 794 int lis3lv02d_remove_fs(struct lis3lv02d *lis3) 795 { 796 sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group); 797 platform_device_unregister(lis3->pdev); 798 if (lis3->pm_dev) { 799 /* Barrier after the sysfs remove */ 800 pm_runtime_barrier(lis3->pm_dev); 801 802 /* SYSFS may have left chip running. Turn off if necessary */ 803 if (!pm_runtime_suspended(lis3->pm_dev)) 804 lis3lv02d_poweroff(&lis3_dev); 805 806 pm_runtime_disable(lis3->pm_dev); 807 pm_runtime_set_suspended(lis3->pm_dev); 808 } 809 kfree(lis3->reg_cache); 810 return 0; 811 } 812 EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs); 813 814 static void lis3lv02d_8b_configure(struct lis3lv02d *dev, 815 struct lis3lv02d_platform_data *p) 816 { 817 int err; 818 int ctrl2 = p->hipass_ctrl; 819 820 if (p->click_flags) { 821 dev->write(dev, CLICK_CFG, p->click_flags); 822 dev->write(dev, CLICK_TIMELIMIT, p->click_time_limit); 823 dev->write(dev, CLICK_LATENCY, p->click_latency); 824 dev->write(dev, CLICK_WINDOW, p->click_window); 825 dev->write(dev, CLICK_THSZ, p->click_thresh_z & 0xf); 826 dev->write(dev, CLICK_THSY_X, 827 (p->click_thresh_x & 0xf) | 828 (p->click_thresh_y << 4)); 829 830 if (dev->idev) { 831 struct input_dev *input_dev = lis3_dev.idev->input; 832 input_set_capability(input_dev, EV_KEY, BTN_X); 833 input_set_capability(input_dev, EV_KEY, BTN_Y); 834 input_set_capability(input_dev, EV_KEY, BTN_Z); 835 } 836 } 837 838 if (p->wakeup_flags) { 839 dev->write(dev, FF_WU_CFG_1, p->wakeup_flags); 840 dev->write(dev, FF_WU_THS_1, p->wakeup_thresh & 0x7f); 841 /* pdata value + 1 to keep this backward compatible*/ 842 dev->write(dev, FF_WU_DURATION_1, p->duration1 + 1); 843 ctrl2 ^= HP_FF_WU1; /* Xor to keep compatible with old pdata*/ 844 } 845 846 if (p->wakeup_flags2) { 847 dev->write(dev, FF_WU_CFG_2, p->wakeup_flags2); 848 dev->write(dev, FF_WU_THS_2, p->wakeup_thresh2 & 0x7f); 849 /* pdata value + 1 to keep this backward compatible*/ 850 dev->write(dev, FF_WU_DURATION_2, p->duration2 + 1); 851 ctrl2 ^= HP_FF_WU2; /* Xor to keep compatible with old pdata*/ 852 } 853 /* Configure hipass filters */ 854 dev->write(dev, CTRL_REG2, ctrl2); 855 856 if (p->irq2) { 857 err = request_threaded_irq(p->irq2, 858 NULL, 859 lis302dl_interrupt_thread2_8b, 860 IRQF_TRIGGER_RISING | IRQF_ONESHOT | 861 (p->irq_flags2 & IRQF_TRIGGER_MASK), 862 DRIVER_NAME, &lis3_dev); 863 if (err < 0) 864 pr_err("No second IRQ. Limited functionality\n"); 865 } 866 } 867 868 /* 869 * Initialise the accelerometer and the various subsystems. 870 * Should be rather independent of the bus system. 871 */ 872 int lis3lv02d_init_device(struct lis3lv02d *dev) 873 { 874 int err; 875 irq_handler_t thread_fn; 876 int irq_flags = 0; 877 878 dev->whoami = lis3lv02d_read_8(dev, WHO_AM_I); 879 880 switch (dev->whoami) { 881 case WAI_12B: 882 pr_info("12 bits sensor found\n"); 883 dev->read_data = lis3lv02d_read_12; 884 dev->mdps_max_val = 2048; 885 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_12B; 886 dev->odrs = lis3_12_rates; 887 dev->odr_mask = CTRL1_DF0 | CTRL1_DF1; 888 dev->scale = LIS3_SENSITIVITY_12B; 889 dev->regs = lis3_wai12_regs; 890 dev->regs_size = ARRAY_SIZE(lis3_wai12_regs); 891 break; 892 case WAI_8B: 893 pr_info("8 bits sensor found\n"); 894 dev->read_data = lis3lv02d_read_8; 895 dev->mdps_max_val = 128; 896 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_8B; 897 dev->odrs = lis3_8_rates; 898 dev->odr_mask = CTRL1_DR; 899 dev->scale = LIS3_SENSITIVITY_8B; 900 dev->regs = lis3_wai8_regs; 901 dev->regs_size = ARRAY_SIZE(lis3_wai8_regs); 902 break; 903 case WAI_3DC: 904 pr_info("8 bits 3DC sensor found\n"); 905 dev->read_data = lis3lv02d_read_8; 906 dev->mdps_max_val = 128; 907 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_8B; 908 dev->odrs = lis3_3dc_rates; 909 dev->odr_mask = CTRL1_ODR0|CTRL1_ODR1|CTRL1_ODR2|CTRL1_ODR3; 910 dev->scale = LIS3_SENSITIVITY_8B; 911 break; 912 default: 913 pr_err("unknown sensor type 0x%X\n", dev->whoami); 914 return -EINVAL; 915 } 916 917 dev->reg_cache = kzalloc(max(sizeof(lis3_wai8_regs), 918 sizeof(lis3_wai12_regs)), GFP_KERNEL); 919 920 if (dev->reg_cache == NULL) { 921 printk(KERN_ERR DRIVER_NAME "out of memory\n"); 922 return -ENOMEM; 923 } 924 925 mutex_init(&dev->mutex); 926 atomic_set(&dev->wake_thread, 0); 927 928 lis3lv02d_add_fs(dev); 929 lis3lv02d_poweron(dev); 930 931 if (dev->pm_dev) { 932 pm_runtime_set_active(dev->pm_dev); 933 pm_runtime_enable(dev->pm_dev); 934 } 935 936 if (lis3lv02d_joystick_enable()) 937 pr_err("joystick initialization failed\n"); 938 939 /* passing in platform specific data is purely optional and only 940 * used by the SPI transport layer at the moment */ 941 if (dev->pdata) { 942 struct lis3lv02d_platform_data *p = dev->pdata; 943 944 if (dev->whoami == WAI_8B) 945 lis3lv02d_8b_configure(dev, p); 946 947 irq_flags = p->irq_flags1 & IRQF_TRIGGER_MASK; 948 949 dev->irq_cfg = p->irq_cfg; 950 if (p->irq_cfg) 951 dev->write(dev, CTRL_REG3, p->irq_cfg); 952 953 if (p->default_rate) 954 lis3lv02d_set_odr(p->default_rate); 955 } 956 957 /* bail if we did not get an IRQ from the bus layer */ 958 if (!dev->irq) { 959 pr_debug("No IRQ. Disabling /dev/freefall\n"); 960 goto out; 961 } 962 963 /* 964 * The sensor can generate interrupts for free-fall and direction 965 * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep 966 * the things simple and _fast_ we activate it only for free-fall, so 967 * no need to read register (very slow with ACPI). For the same reason, 968 * we forbid shared interrupts. 969 * 970 * IRQF_TRIGGER_RISING seems pointless on HP laptops because the 971 * io-apic is not configurable (and generates a warning) but I keep it 972 * in case of support for other hardware. 973 */ 974 if (dev->pdata && dev->whoami == WAI_8B) 975 thread_fn = lis302dl_interrupt_thread1_8b; 976 else 977 thread_fn = NULL; 978 979 err = request_threaded_irq(dev->irq, lis302dl_interrupt, 980 thread_fn, 981 IRQF_TRIGGER_RISING | IRQF_ONESHOT | 982 irq_flags, 983 DRIVER_NAME, &lis3_dev); 984 985 if (err < 0) { 986 pr_err("Cannot get IRQ\n"); 987 goto out; 988 } 989 990 if (misc_register(&lis3lv02d_misc_device)) 991 pr_err("misc_register failed\n"); 992 out: 993 return 0; 994 } 995 EXPORT_SYMBOL_GPL(lis3lv02d_init_device); 996 997 MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver"); 998 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek"); 999 MODULE_LICENSE("GPL"); 1000