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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");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * lis3lv02d.c - ST LIS3LV02DL accelerometer driver
4 *
5 * Copyright (C) 2007-2008 Yan Burman
6 * Copyright (C) 2008 Eric Piel
7 * Copyright (C) 2008-2009 Pavel Machek
8 */
9
10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/kernel.h>
13#include <linux/sched/signal.h>
14#include <linux/dmi.h>
15#include <linux/module.h>
16#include <linux/types.h>
17#include <linux/platform_device.h>
18#include <linux/interrupt.h>
19#include <linux/input-polldev.h>
20#include <linux/delay.h>
21#include <linux/wait.h>
22#include <linux/poll.h>
23#include <linux/slab.h>
24#include <linux/freezer.h>
25#include <linux/uaccess.h>
26#include <linux/miscdevice.h>
27#include <linux/pm_runtime.h>
28#include <linux/atomic.h>
29#include <linux/of_device.h>
30#include "lis3lv02d.h"
31
32#define DRIVER_NAME "lis3lv02d"
33
34/* joystick device poll interval in milliseconds */
35#define MDPS_POLL_INTERVAL 50
36#define MDPS_POLL_MIN 0
37#define MDPS_POLL_MAX 2000
38
39#define LIS3_SYSFS_POWERDOWN_DELAY 5000 /* In milliseconds */
40
41#define SELFTEST_OK 0
42#define SELFTEST_FAIL -1
43#define SELFTEST_IRQ -2
44
45#define IRQ_LINE0 0
46#define IRQ_LINE1 1
47
48/*
49 * The sensor can also generate interrupts (DRDY) but it's pretty pointless
50 * because they are generated even if the data do not change. So it's better
51 * to keep the interrupt for the free-fall event. The values are updated at
52 * 40Hz (at the lowest frequency), but as it can be pretty time consuming on
53 * some low processor, we poll the sensor only at 20Hz... enough for the
54 * joystick.
55 */
56
57#define LIS3_PWRON_DELAY_WAI_12B (5000)
58#define LIS3_PWRON_DELAY_WAI_8B (3000)
59
60/*
61 * LIS3LV02D spec says 1024 LSBs corresponds 1 G -> 1LSB is 1000/1024 mG
62 * LIS302D spec says: 18 mG / digit
63 * LIS3_ACCURACY is used to increase accuracy of the intermediate
64 * calculation results.
65 */
66#define LIS3_ACCURACY 1024
67/* Sensitivity values for -2G +2G scale */
68#define LIS3_SENSITIVITY_12B ((LIS3_ACCURACY * 1000) / 1024)
69#define LIS3_SENSITIVITY_8B (18 * LIS3_ACCURACY)
70
71/*
72 * LIS331DLH spec says 1LSBs corresponds 4G/4096 -> 1LSB is 1000/1024 mG.
73 * Below macros defines sensitivity values for +/-2G. Dataout bits for
74 * +/-2G range is 12 bits so 4 bits adjustment must be done to get 12bit
75 * data from 16bit value. Currently this driver supports only 2G range.
76 */
77#define LIS3DLH_SENSITIVITY_2G ((LIS3_ACCURACY * 1000) / 1024)
78#define SHIFT_ADJ_2G 4
79
80#define LIS3_DEFAULT_FUZZ_12B 3
81#define LIS3_DEFAULT_FLAT_12B 3
82#define LIS3_DEFAULT_FUZZ_8B 1
83#define LIS3_DEFAULT_FLAT_8B 1
84
85struct lis3lv02d lis3_dev = {
86 .misc_wait = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait),
87};
88EXPORT_SYMBOL_GPL(lis3_dev);
89
90/* just like param_set_int() but does sanity-check so that it won't point
91 * over the axis array size
92 */
93static int param_set_axis(const char *val, const struct kernel_param *kp)
94{
95 int ret = param_set_int(val, kp);
96 if (!ret) {
97 int val = *(int *)kp->arg;
98 if (val < 0)
99 val = -val;
100 if (!val || val > 3)
101 return -EINVAL;
102 }
103 return ret;
104}
105
106static const struct kernel_param_ops param_ops_axis = {
107 .set = param_set_axis,
108 .get = param_get_int,
109};
110
111#define param_check_axis(name, p) param_check_int(name, p)
112
113module_param_array_named(axes, lis3_dev.ac.as_array, axis, NULL, 0644);
114MODULE_PARM_DESC(axes, "Axis-mapping for x,y,z directions");
115
116static s16 lis3lv02d_read_8(struct lis3lv02d *lis3, int reg)
117{
118 s8 lo;
119 if (lis3->read(lis3, reg, &lo) < 0)
120 return 0;
121
122 return lo;
123}
124
125static s16 lis3lv02d_read_12(struct lis3lv02d *lis3, int reg)
126{
127 u8 lo, hi;
128
129 lis3->read(lis3, reg - 1, &lo);
130 lis3->read(lis3, reg, &hi);
131 /* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */
132 return (s16)((hi << 8) | lo);
133}
134
135/* 12bits for 2G range, 13 bits for 4G range and 14 bits for 8G range */
136static s16 lis331dlh_read_data(struct lis3lv02d *lis3, int reg)
137{
138 u8 lo, hi;
139 int v;
140
141 lis3->read(lis3, reg - 1, &lo);
142 lis3->read(lis3, reg, &hi);
143 v = (int) ((hi << 8) | lo);
144
145 return (s16) v >> lis3->shift_adj;
146}
147
148/**
149 * lis3lv02d_get_axis - For the given axis, give the value converted
150 * @axis: 1,2,3 - can also be negative
151 * @hw_values: raw values returned by the hardware
152 *
153 * Returns the converted value.
154 */
155static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3])
156{
157 if (axis > 0)
158 return hw_values[axis - 1];
159 else
160 return -hw_values[-axis - 1];
161}
162
163/**
164 * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer
165 * @lis3: pointer to the device struct
166 * @x: where to store the X axis value
167 * @y: where to store the Y axis value
168 * @z: where to store the Z axis value
169 *
170 * Note that 40Hz input device can eat up about 10% CPU at 800MHZ
171 */
172static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z)
173{
174 int position[3];
175 int i;
176
177 if (lis3->blkread) {
178 if (lis3->whoami == WAI_12B) {
179 u16 data[3];
180 lis3->blkread(lis3, OUTX_L, 6, (u8 *)data);
181 for (i = 0; i < 3; i++)
182 position[i] = (s16)le16_to_cpu(data[i]);
183 } else {
184 u8 data[5];
185 /* Data: x, dummy, y, dummy, z */
186 lis3->blkread(lis3, OUTX, 5, data);
187 for (i = 0; i < 3; i++)
188 position[i] = (s8)data[i * 2];
189 }
190 } else {
191 position[0] = lis3->read_data(lis3, OUTX);
192 position[1] = lis3->read_data(lis3, OUTY);
193 position[2] = lis3->read_data(lis3, OUTZ);
194 }
195
196 for (i = 0; i < 3; i++)
197 position[i] = (position[i] * lis3->scale) / LIS3_ACCURACY;
198
199 *x = lis3lv02d_get_axis(lis3->ac.x, position);
200 *y = lis3lv02d_get_axis(lis3->ac.y, position);
201 *z = lis3lv02d_get_axis(lis3->ac.z, position);
202}
203
204/* conversion btw sampling rate and the register values */
205static int lis3_12_rates[4] = {40, 160, 640, 2560};
206static int lis3_8_rates[2] = {100, 400};
207static int lis3_3dc_rates[16] = {0, 1, 10, 25, 50, 100, 200, 400, 1600, 5000};
208static int lis3_3dlh_rates[4] = {50, 100, 400, 1000};
209
210/* ODR is Output Data Rate */
211static int lis3lv02d_get_odr(struct lis3lv02d *lis3)
212{
213 u8 ctrl;
214 int shift;
215
216 lis3->read(lis3, CTRL_REG1, &ctrl);
217 ctrl &= lis3->odr_mask;
218 shift = ffs(lis3->odr_mask) - 1;
219 return lis3->odrs[(ctrl >> shift)];
220}
221
222static int lis3lv02d_get_pwron_wait(struct lis3lv02d *lis3)
223{
224 int div = lis3lv02d_get_odr(lis3);
225
226 if (WARN_ONCE(div == 0, "device returned spurious data"))
227 return -ENXIO;
228
229 /* LIS3 power on delay is quite long */
230 msleep(lis3->pwron_delay / div);
231 return 0;
232}
233
234static int lis3lv02d_set_odr(struct lis3lv02d *lis3, int rate)
235{
236 u8 ctrl;
237 int i, len, shift;
238
239 if (!rate)
240 return -EINVAL;
241
242 lis3->read(lis3, CTRL_REG1, &ctrl);
243 ctrl &= ~lis3->odr_mask;
244 len = 1 << hweight_long(lis3->odr_mask); /* # of possible values */
245 shift = ffs(lis3->odr_mask) - 1;
246
247 for (i = 0; i < len; i++)
248 if (lis3->odrs[i] == rate) {
249 lis3->write(lis3, CTRL_REG1,
250 ctrl | (i << shift));
251 return 0;
252 }
253 return -EINVAL;
254}
255
256static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
257{
258 u8 ctlreg, reg;
259 s16 x, y, z;
260 u8 selftest;
261 int ret;
262 u8 ctrl_reg_data;
263 unsigned char irq_cfg;
264
265 mutex_lock(&lis3->mutex);
266
267 irq_cfg = lis3->irq_cfg;
268 if (lis3->whoami == WAI_8B) {
269 lis3->data_ready_count[IRQ_LINE0] = 0;
270 lis3->data_ready_count[IRQ_LINE1] = 0;
271
272 /* Change interrupt cfg to data ready for selftest */
273 atomic_inc(&lis3->wake_thread);
274 lis3->irq_cfg = LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY;
275 lis3->read(lis3, CTRL_REG3, &ctrl_reg_data);
276 lis3->write(lis3, CTRL_REG3, (ctrl_reg_data &
277 ~(LIS3_IRQ1_MASK | LIS3_IRQ2_MASK)) |
278 (LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY));
279 }
280
281 if ((lis3->whoami == WAI_3DC) || (lis3->whoami == WAI_3DLH)) {
282 ctlreg = CTRL_REG4;
283 selftest = CTRL4_ST0;
284 } else {
285 ctlreg = CTRL_REG1;
286 if (lis3->whoami == WAI_12B)
287 selftest = CTRL1_ST;
288 else
289 selftest = CTRL1_STP;
290 }
291
292 lis3->read(lis3, ctlreg, ®);
293 lis3->write(lis3, ctlreg, (reg | selftest));
294 ret = lis3lv02d_get_pwron_wait(lis3);
295 if (ret)
296 goto fail;
297
298 /* Read directly to avoid axis remap */
299 x = lis3->read_data(lis3, OUTX);
300 y = lis3->read_data(lis3, OUTY);
301 z = lis3->read_data(lis3, OUTZ);
302
303 /* back to normal settings */
304 lis3->write(lis3, ctlreg, reg);
305 ret = lis3lv02d_get_pwron_wait(lis3);
306 if (ret)
307 goto fail;
308
309 results[0] = x - lis3->read_data(lis3, OUTX);
310 results[1] = y - lis3->read_data(lis3, OUTY);
311 results[2] = z - lis3->read_data(lis3, OUTZ);
312
313 ret = 0;
314
315 if (lis3->whoami == WAI_8B) {
316 /* Restore original interrupt configuration */
317 atomic_dec(&lis3->wake_thread);
318 lis3->write(lis3, CTRL_REG3, ctrl_reg_data);
319 lis3->irq_cfg = irq_cfg;
320
321 if ((irq_cfg & LIS3_IRQ1_MASK) &&
322 lis3->data_ready_count[IRQ_LINE0] < 2) {
323 ret = SELFTEST_IRQ;
324 goto fail;
325 }
326
327 if ((irq_cfg & LIS3_IRQ2_MASK) &&
328 lis3->data_ready_count[IRQ_LINE1] < 2) {
329 ret = SELFTEST_IRQ;
330 goto fail;
331 }
332 }
333
334 if (lis3->pdata) {
335 int i;
336 for (i = 0; i < 3; i++) {
337 /* Check against selftest acceptance limits */
338 if ((results[i] < lis3->pdata->st_min_limits[i]) ||
339 (results[i] > lis3->pdata->st_max_limits[i])) {
340 ret = SELFTEST_FAIL;
341 goto fail;
342 }
343 }
344 }
345
346 /* test passed */
347fail:
348 mutex_unlock(&lis3->mutex);
349 return ret;
350}
351
352/*
353 * Order of registers in the list affects to order of the restore process.
354 * Perhaps it is a good idea to set interrupt enable register as a last one
355 * after all other configurations
356 */
357static u8 lis3_wai8_regs[] = { FF_WU_CFG_1, FF_WU_THS_1, FF_WU_DURATION_1,
358 FF_WU_CFG_2, FF_WU_THS_2, FF_WU_DURATION_2,
359 CLICK_CFG, CLICK_SRC, CLICK_THSY_X, CLICK_THSZ,
360 CLICK_TIMELIMIT, CLICK_LATENCY, CLICK_WINDOW,
361 CTRL_REG1, CTRL_REG2, CTRL_REG3};
362
363static u8 lis3_wai12_regs[] = {FF_WU_CFG, FF_WU_THS_L, FF_WU_THS_H,
364 FF_WU_DURATION, DD_CFG, DD_THSI_L, DD_THSI_H,
365 DD_THSE_L, DD_THSE_H,
366 CTRL_REG1, CTRL_REG3, CTRL_REG2};
367
368static inline void lis3_context_save(struct lis3lv02d *lis3)
369{
370 int i;
371 for (i = 0; i < lis3->regs_size; i++)
372 lis3->read(lis3, lis3->regs[i], &lis3->reg_cache[i]);
373 lis3->regs_stored = true;
374}
375
376static inline void lis3_context_restore(struct lis3lv02d *lis3)
377{
378 int i;
379 if (lis3->regs_stored)
380 for (i = 0; i < lis3->regs_size; i++)
381 lis3->write(lis3, lis3->regs[i], lis3->reg_cache[i]);
382}
383
384void lis3lv02d_poweroff(struct lis3lv02d *lis3)
385{
386 if (lis3->reg_ctrl)
387 lis3_context_save(lis3);
388 /* disable X,Y,Z axis and power down */
389 lis3->write(lis3, CTRL_REG1, 0x00);
390 if (lis3->reg_ctrl)
391 lis3->reg_ctrl(lis3, LIS3_REG_OFF);
392}
393EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);
394
395int lis3lv02d_poweron(struct lis3lv02d *lis3)
396{
397 int err;
398 u8 reg;
399
400 lis3->init(lis3);
401
402 /*
403 * Common configuration
404 * BDU: (12 bits sensors only) LSB and MSB values are not updated until
405 * both have been read. So the value read will always be correct.
406 * Set BOOT bit to refresh factory tuning values.
407 */
408 if (lis3->pdata) {
409 lis3->read(lis3, CTRL_REG2, ®);
410 if (lis3->whoami == WAI_12B)
411 reg |= CTRL2_BDU | CTRL2_BOOT;
412 else if (lis3->whoami == WAI_3DLH)
413 reg |= CTRL2_BOOT_3DLH;
414 else
415 reg |= CTRL2_BOOT_8B;
416 lis3->write(lis3, CTRL_REG2, reg);
417
418 if (lis3->whoami == WAI_3DLH) {
419 lis3->read(lis3, CTRL_REG4, ®);
420 reg |= CTRL4_BDU;
421 lis3->write(lis3, CTRL_REG4, reg);
422 }
423 }
424
425 err = lis3lv02d_get_pwron_wait(lis3);
426 if (err)
427 return err;
428
429 if (lis3->reg_ctrl)
430 lis3_context_restore(lis3);
431
432 return 0;
433}
434EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
435
436
437static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev)
438{
439 struct lis3lv02d *lis3 = pidev->private;
440 int x, y, z;
441
442 mutex_lock(&lis3->mutex);
443 lis3lv02d_get_xyz(lis3, &x, &y, &z);
444 input_report_abs(pidev->input, ABS_X, x);
445 input_report_abs(pidev->input, ABS_Y, y);
446 input_report_abs(pidev->input, ABS_Z, z);
447 input_sync(pidev->input);
448 mutex_unlock(&lis3->mutex);
449}
450
451static void lis3lv02d_joystick_open(struct input_polled_dev *pidev)
452{
453 struct lis3lv02d *lis3 = pidev->private;
454
455 if (lis3->pm_dev)
456 pm_runtime_get_sync(lis3->pm_dev);
457
458 if (lis3->pdata && lis3->whoami == WAI_8B && lis3->idev)
459 atomic_set(&lis3->wake_thread, 1);
460 /*
461 * Update coordinates for the case where poll interval is 0 and
462 * the chip in running purely under interrupt control
463 */
464 lis3lv02d_joystick_poll(pidev);
465}
466
467static void lis3lv02d_joystick_close(struct input_polled_dev *pidev)
468{
469 struct lis3lv02d *lis3 = pidev->private;
470
471 atomic_set(&lis3->wake_thread, 0);
472 if (lis3->pm_dev)
473 pm_runtime_put(lis3->pm_dev);
474}
475
476static irqreturn_t lis302dl_interrupt(int irq, void *data)
477{
478 struct lis3lv02d *lis3 = data;
479
480 if (!test_bit(0, &lis3->misc_opened))
481 goto out;
482
483 /*
484 * Be careful: on some HP laptops the bios force DD when on battery and
485 * the lid is closed. This leads to interrupts as soon as a little move
486 * is done.
487 */
488 atomic_inc(&lis3->count);
489
490 wake_up_interruptible(&lis3->misc_wait);
491 kill_fasync(&lis3->async_queue, SIGIO, POLL_IN);
492out:
493 if (atomic_read(&lis3->wake_thread))
494 return IRQ_WAKE_THREAD;
495 return IRQ_HANDLED;
496}
497
498static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3)
499{
500 struct input_dev *dev = lis3->idev->input;
501 u8 click_src;
502
503 mutex_lock(&lis3->mutex);
504 lis3->read(lis3, CLICK_SRC, &click_src);
505
506 if (click_src & CLICK_SINGLE_X) {
507 input_report_key(dev, lis3->mapped_btns[0], 1);
508 input_report_key(dev, lis3->mapped_btns[0], 0);
509 }
510
511 if (click_src & CLICK_SINGLE_Y) {
512 input_report_key(dev, lis3->mapped_btns[1], 1);
513 input_report_key(dev, lis3->mapped_btns[1], 0);
514 }
515
516 if (click_src & CLICK_SINGLE_Z) {
517 input_report_key(dev, lis3->mapped_btns[2], 1);
518 input_report_key(dev, lis3->mapped_btns[2], 0);
519 }
520 input_sync(dev);
521 mutex_unlock(&lis3->mutex);
522}
523
524static inline void lis302dl_data_ready(struct lis3lv02d *lis3, int index)
525{
526 int dummy;
527
528 /* Dummy read to ack interrupt */
529 lis3lv02d_get_xyz(lis3, &dummy, &dummy, &dummy);
530 lis3->data_ready_count[index]++;
531}
532
533static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data)
534{
535 struct lis3lv02d *lis3 = data;
536 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ1_MASK;
537
538 if (irq_cfg == LIS3_IRQ1_CLICK)
539 lis302dl_interrupt_handle_click(lis3);
540 else if (unlikely(irq_cfg == LIS3_IRQ1_DATA_READY))
541 lis302dl_data_ready(lis3, IRQ_LINE0);
542 else
543 lis3lv02d_joystick_poll(lis3->idev);
544
545 return IRQ_HANDLED;
546}
547
548static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data)
549{
550 struct lis3lv02d *lis3 = data;
551 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ2_MASK;
552
553 if (irq_cfg == LIS3_IRQ2_CLICK)
554 lis302dl_interrupt_handle_click(lis3);
555 else if (unlikely(irq_cfg == LIS3_IRQ2_DATA_READY))
556 lis302dl_data_ready(lis3, IRQ_LINE1);
557 else
558 lis3lv02d_joystick_poll(lis3->idev);
559
560 return IRQ_HANDLED;
561}
562
563static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
564{
565 struct lis3lv02d *lis3 = container_of(file->private_data,
566 struct lis3lv02d, miscdev);
567
568 if (test_and_set_bit(0, &lis3->misc_opened))
569 return -EBUSY; /* already open */
570
571 if (lis3->pm_dev)
572 pm_runtime_get_sync(lis3->pm_dev);
573
574 atomic_set(&lis3->count, 0);
575 return 0;
576}
577
578static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
579{
580 struct lis3lv02d *lis3 = container_of(file->private_data,
581 struct lis3lv02d, miscdev);
582
583 clear_bit(0, &lis3->misc_opened); /* release the device */
584 if (lis3->pm_dev)
585 pm_runtime_put(lis3->pm_dev);
586 return 0;
587}
588
589static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf,
590 size_t count, loff_t *pos)
591{
592 struct lis3lv02d *lis3 = container_of(file->private_data,
593 struct lis3lv02d, miscdev);
594
595 DECLARE_WAITQUEUE(wait, current);
596 u32 data;
597 unsigned char byte_data;
598 ssize_t retval = 1;
599
600 if (count < 1)
601 return -EINVAL;
602
603 add_wait_queue(&lis3->misc_wait, &wait);
604 while (true) {
605 set_current_state(TASK_INTERRUPTIBLE);
606 data = atomic_xchg(&lis3->count, 0);
607 if (data)
608 break;
609
610 if (file->f_flags & O_NONBLOCK) {
611 retval = -EAGAIN;
612 goto out;
613 }
614
615 if (signal_pending(current)) {
616 retval = -ERESTARTSYS;
617 goto out;
618 }
619
620 schedule();
621 }
622
623 if (data < 255)
624 byte_data = data;
625 else
626 byte_data = 255;
627
628 /* make sure we are not going into copy_to_user() with
629 * TASK_INTERRUPTIBLE state */
630 set_current_state(TASK_RUNNING);
631 if (copy_to_user(buf, &byte_data, sizeof(byte_data)))
632 retval = -EFAULT;
633
634out:
635 __set_current_state(TASK_RUNNING);
636 remove_wait_queue(&lis3->misc_wait, &wait);
637
638 return retval;
639}
640
641static __poll_t lis3lv02d_misc_poll(struct file *file, poll_table *wait)
642{
643 struct lis3lv02d *lis3 = container_of(file->private_data,
644 struct lis3lv02d, miscdev);
645
646 poll_wait(file, &lis3->misc_wait, wait);
647 if (atomic_read(&lis3->count))
648 return EPOLLIN | EPOLLRDNORM;
649 return 0;
650}
651
652static int lis3lv02d_misc_fasync(int fd, struct file *file, int on)
653{
654 struct lis3lv02d *lis3 = container_of(file->private_data,
655 struct lis3lv02d, miscdev);
656
657 return fasync_helper(fd, file, on, &lis3->async_queue);
658}
659
660static const struct file_operations lis3lv02d_misc_fops = {
661 .owner = THIS_MODULE,
662 .llseek = no_llseek,
663 .read = lis3lv02d_misc_read,
664 .open = lis3lv02d_misc_open,
665 .release = lis3lv02d_misc_release,
666 .poll = lis3lv02d_misc_poll,
667 .fasync = lis3lv02d_misc_fasync,
668};
669
670int lis3lv02d_joystick_enable(struct lis3lv02d *lis3)
671{
672 struct input_dev *input_dev;
673 int err;
674 int max_val, fuzz, flat;
675 int btns[] = {BTN_X, BTN_Y, BTN_Z};
676
677 if (lis3->idev)
678 return -EINVAL;
679
680 lis3->idev = input_allocate_polled_device();
681 if (!lis3->idev)
682 return -ENOMEM;
683
684 lis3->idev->poll = lis3lv02d_joystick_poll;
685 lis3->idev->open = lis3lv02d_joystick_open;
686 lis3->idev->close = lis3lv02d_joystick_close;
687 lis3->idev->poll_interval = MDPS_POLL_INTERVAL;
688 lis3->idev->poll_interval_min = MDPS_POLL_MIN;
689 lis3->idev->poll_interval_max = MDPS_POLL_MAX;
690 lis3->idev->private = lis3;
691 input_dev = lis3->idev->input;
692
693 input_dev->name = "ST LIS3LV02DL Accelerometer";
694 input_dev->phys = DRIVER_NAME "/input0";
695 input_dev->id.bustype = BUS_HOST;
696 input_dev->id.vendor = 0;
697 input_dev->dev.parent = &lis3->pdev->dev;
698
699 set_bit(EV_ABS, input_dev->evbit);
700 max_val = (lis3->mdps_max_val * lis3->scale) / LIS3_ACCURACY;
701 if (lis3->whoami == WAI_12B) {
702 fuzz = LIS3_DEFAULT_FUZZ_12B;
703 flat = LIS3_DEFAULT_FLAT_12B;
704 } else {
705 fuzz = LIS3_DEFAULT_FUZZ_8B;
706 flat = LIS3_DEFAULT_FLAT_8B;
707 }
708 fuzz = (fuzz * lis3->scale) / LIS3_ACCURACY;
709 flat = (flat * lis3->scale) / LIS3_ACCURACY;
710
711 input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat);
712 input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat);
713 input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat);
714
715 lis3->mapped_btns[0] = lis3lv02d_get_axis(abs(lis3->ac.x), btns);
716 lis3->mapped_btns[1] = lis3lv02d_get_axis(abs(lis3->ac.y), btns);
717 lis3->mapped_btns[2] = lis3lv02d_get_axis(abs(lis3->ac.z), btns);
718
719 err = input_register_polled_device(lis3->idev);
720 if (err) {
721 input_free_polled_device(lis3->idev);
722 lis3->idev = NULL;
723 }
724
725 return err;
726}
727EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
728
729void lis3lv02d_joystick_disable(struct lis3lv02d *lis3)
730{
731 if (lis3->irq)
732 free_irq(lis3->irq, lis3);
733 if (lis3->pdata && lis3->pdata->irq2)
734 free_irq(lis3->pdata->irq2, lis3);
735
736 if (!lis3->idev)
737 return;
738
739 if (lis3->irq)
740 misc_deregister(&lis3->miscdev);
741 input_unregister_polled_device(lis3->idev);
742 input_free_polled_device(lis3->idev);
743 lis3->idev = NULL;
744}
745EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
746
747/* Sysfs stuff */
748static void lis3lv02d_sysfs_poweron(struct lis3lv02d *lis3)
749{
750 /*
751 * SYSFS functions are fast visitors so put-call
752 * immediately after the get-call. However, keep
753 * chip running for a while and schedule delayed
754 * suspend. This way periodic sysfs calls doesn't
755 * suffer from relatively long power up time.
756 */
757
758 if (lis3->pm_dev) {
759 pm_runtime_get_sync(lis3->pm_dev);
760 pm_runtime_put_noidle(lis3->pm_dev);
761 pm_schedule_suspend(lis3->pm_dev, LIS3_SYSFS_POWERDOWN_DELAY);
762 }
763}
764
765static ssize_t lis3lv02d_selftest_show(struct device *dev,
766 struct device_attribute *attr, char *buf)
767{
768 struct lis3lv02d *lis3 = dev_get_drvdata(dev);
769 s16 values[3];
770
771 static const char ok[] = "OK";
772 static const char fail[] = "FAIL";
773 static const char irq[] = "FAIL_IRQ";
774 const char *res;
775
776 lis3lv02d_sysfs_poweron(lis3);
777 switch (lis3lv02d_selftest(lis3, values)) {
778 case SELFTEST_FAIL:
779 res = fail;
780 break;
781 case SELFTEST_IRQ:
782 res = irq;
783 break;
784 case SELFTEST_OK:
785 default:
786 res = ok;
787 break;
788 }
789 return sprintf(buf, "%s %d %d %d\n", res,
790 values[0], values[1], values[2]);
791}
792
793static ssize_t lis3lv02d_position_show(struct device *dev,
794 struct device_attribute *attr, char *buf)
795{
796 struct lis3lv02d *lis3 = dev_get_drvdata(dev);
797 int x, y, z;
798
799 lis3lv02d_sysfs_poweron(lis3);
800 mutex_lock(&lis3->mutex);
801 lis3lv02d_get_xyz(lis3, &x, &y, &z);
802 mutex_unlock(&lis3->mutex);
803 return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
804}
805
806static ssize_t lis3lv02d_rate_show(struct device *dev,
807 struct device_attribute *attr, char *buf)
808{
809 struct lis3lv02d *lis3 = dev_get_drvdata(dev);
810
811 lis3lv02d_sysfs_poweron(lis3);
812 return sprintf(buf, "%d\n", lis3lv02d_get_odr(lis3));
813}
814
815static ssize_t lis3lv02d_rate_set(struct device *dev,
816 struct device_attribute *attr, const char *buf,
817 size_t count)
818{
819 struct lis3lv02d *lis3 = dev_get_drvdata(dev);
820 unsigned long rate;
821 int ret;
822
823 ret = kstrtoul(buf, 0, &rate);
824 if (ret)
825 return ret;
826
827 lis3lv02d_sysfs_poweron(lis3);
828 if (lis3lv02d_set_odr(lis3, rate))
829 return -EINVAL;
830
831 return count;
832}
833
834static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL);
835static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
836static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show,
837 lis3lv02d_rate_set);
838
839static struct attribute *lis3lv02d_attributes[] = {
840 &dev_attr_selftest.attr,
841 &dev_attr_position.attr,
842 &dev_attr_rate.attr,
843 NULL
844};
845
846static const struct attribute_group lis3lv02d_attribute_group = {
847 .attrs = lis3lv02d_attributes
848};
849
850
851static int lis3lv02d_add_fs(struct lis3lv02d *lis3)
852{
853 lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
854 if (IS_ERR(lis3->pdev))
855 return PTR_ERR(lis3->pdev);
856
857 platform_set_drvdata(lis3->pdev, lis3);
858 return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
859}
860
861int lis3lv02d_remove_fs(struct lis3lv02d *lis3)
862{
863 sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
864 platform_device_unregister(lis3->pdev);
865 if (lis3->pm_dev) {
866 /* Barrier after the sysfs remove */
867 pm_runtime_barrier(lis3->pm_dev);
868
869 /* SYSFS may have left chip running. Turn off if necessary */
870 if (!pm_runtime_suspended(lis3->pm_dev))
871 lis3lv02d_poweroff(lis3);
872
873 pm_runtime_disable(lis3->pm_dev);
874 pm_runtime_set_suspended(lis3->pm_dev);
875 }
876 kfree(lis3->reg_cache);
877 return 0;
878}
879EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
880
881static void lis3lv02d_8b_configure(struct lis3lv02d *lis3,
882 struct lis3lv02d_platform_data *p)
883{
884 int err;
885 int ctrl2 = p->hipass_ctrl;
886
887 if (p->click_flags) {
888 lis3->write(lis3, CLICK_CFG, p->click_flags);
889 lis3->write(lis3, CLICK_TIMELIMIT, p->click_time_limit);
890 lis3->write(lis3, CLICK_LATENCY, p->click_latency);
891 lis3->write(lis3, CLICK_WINDOW, p->click_window);
892 lis3->write(lis3, CLICK_THSZ, p->click_thresh_z & 0xf);
893 lis3->write(lis3, CLICK_THSY_X,
894 (p->click_thresh_x & 0xf) |
895 (p->click_thresh_y << 4));
896
897 if (lis3->idev) {
898 struct input_dev *input_dev = lis3->idev->input;
899 input_set_capability(input_dev, EV_KEY, BTN_X);
900 input_set_capability(input_dev, EV_KEY, BTN_Y);
901 input_set_capability(input_dev, EV_KEY, BTN_Z);
902 }
903 }
904
905 if (p->wakeup_flags) {
906 lis3->write(lis3, FF_WU_CFG_1, p->wakeup_flags);
907 lis3->write(lis3, FF_WU_THS_1, p->wakeup_thresh & 0x7f);
908 /* pdata value + 1 to keep this backward compatible*/
909 lis3->write(lis3, FF_WU_DURATION_1, p->duration1 + 1);
910 ctrl2 ^= HP_FF_WU1; /* Xor to keep compatible with old pdata*/
911 }
912
913 if (p->wakeup_flags2) {
914 lis3->write(lis3, FF_WU_CFG_2, p->wakeup_flags2);
915 lis3->write(lis3, FF_WU_THS_2, p->wakeup_thresh2 & 0x7f);
916 /* pdata value + 1 to keep this backward compatible*/
917 lis3->write(lis3, FF_WU_DURATION_2, p->duration2 + 1);
918 ctrl2 ^= HP_FF_WU2; /* Xor to keep compatible with old pdata*/
919 }
920 /* Configure hipass filters */
921 lis3->write(lis3, CTRL_REG2, ctrl2);
922
923 if (p->irq2) {
924 err = request_threaded_irq(p->irq2,
925 NULL,
926 lis302dl_interrupt_thread2_8b,
927 IRQF_TRIGGER_RISING | IRQF_ONESHOT |
928 (p->irq_flags2 & IRQF_TRIGGER_MASK),
929 DRIVER_NAME, lis3);
930 if (err < 0)
931 pr_err("No second IRQ. Limited functionality\n");
932 }
933}
934
935#ifdef CONFIG_OF
936int lis3lv02d_init_dt(struct lis3lv02d *lis3)
937{
938 struct lis3lv02d_platform_data *pdata;
939 struct device_node *np = lis3->of_node;
940 u32 val;
941 s32 sval;
942
943 if (!lis3->of_node)
944 return 0;
945
946 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
947 if (!pdata)
948 return -ENOMEM;
949
950 if (of_get_property(np, "st,click-single-x", NULL))
951 pdata->click_flags |= LIS3_CLICK_SINGLE_X;
952 if (of_get_property(np, "st,click-double-x", NULL))
953 pdata->click_flags |= LIS3_CLICK_DOUBLE_X;
954
955 if (of_get_property(np, "st,click-single-y", NULL))
956 pdata->click_flags |= LIS3_CLICK_SINGLE_Y;
957 if (of_get_property(np, "st,click-double-y", NULL))
958 pdata->click_flags |= LIS3_CLICK_DOUBLE_Y;
959
960 if (of_get_property(np, "st,click-single-z", NULL))
961 pdata->click_flags |= LIS3_CLICK_SINGLE_Z;
962 if (of_get_property(np, "st,click-double-z", NULL))
963 pdata->click_flags |= LIS3_CLICK_DOUBLE_Z;
964
965 if (!of_property_read_u32(np, "st,click-threshold-x", &val))
966 pdata->click_thresh_x = val;
967 if (!of_property_read_u32(np, "st,click-threshold-y", &val))
968 pdata->click_thresh_y = val;
969 if (!of_property_read_u32(np, "st,click-threshold-z", &val))
970 pdata->click_thresh_z = val;
971
972 if (!of_property_read_u32(np, "st,click-time-limit", &val))
973 pdata->click_time_limit = val;
974 if (!of_property_read_u32(np, "st,click-latency", &val))
975 pdata->click_latency = val;
976 if (!of_property_read_u32(np, "st,click-window", &val))
977 pdata->click_window = val;
978
979 if (of_get_property(np, "st,irq1-disable", NULL))
980 pdata->irq_cfg |= LIS3_IRQ1_DISABLE;
981 if (of_get_property(np, "st,irq1-ff-wu-1", NULL))
982 pdata->irq_cfg |= LIS3_IRQ1_FF_WU_1;
983 if (of_get_property(np, "st,irq1-ff-wu-2", NULL))
984 pdata->irq_cfg |= LIS3_IRQ1_FF_WU_2;
985 if (of_get_property(np, "st,irq1-data-ready", NULL))
986 pdata->irq_cfg |= LIS3_IRQ1_DATA_READY;
987 if (of_get_property(np, "st,irq1-click", NULL))
988 pdata->irq_cfg |= LIS3_IRQ1_CLICK;
989
990 if (of_get_property(np, "st,irq2-disable", NULL))
991 pdata->irq_cfg |= LIS3_IRQ2_DISABLE;
992 if (of_get_property(np, "st,irq2-ff-wu-1", NULL))
993 pdata->irq_cfg |= LIS3_IRQ2_FF_WU_1;
994 if (of_get_property(np, "st,irq2-ff-wu-2", NULL))
995 pdata->irq_cfg |= LIS3_IRQ2_FF_WU_2;
996 if (of_get_property(np, "st,irq2-data-ready", NULL))
997 pdata->irq_cfg |= LIS3_IRQ2_DATA_READY;
998 if (of_get_property(np, "st,irq2-click", NULL))
999 pdata->irq_cfg |= LIS3_IRQ2_CLICK;
1000
1001 if (of_get_property(np, "st,irq-open-drain", NULL))
1002 pdata->irq_cfg |= LIS3_IRQ_OPEN_DRAIN;
1003 if (of_get_property(np, "st,irq-active-low", NULL))
1004 pdata->irq_cfg |= LIS3_IRQ_ACTIVE_LOW;
1005
1006 if (!of_property_read_u32(np, "st,wu-duration-1", &val))
1007 pdata->duration1 = val;
1008 if (!of_property_read_u32(np, "st,wu-duration-2", &val))
1009 pdata->duration2 = val;
1010
1011 if (of_get_property(np, "st,wakeup-x-lo", NULL))
1012 pdata->wakeup_flags |= LIS3_WAKEUP_X_LO;
1013 if (of_get_property(np, "st,wakeup-x-hi", NULL))
1014 pdata->wakeup_flags |= LIS3_WAKEUP_X_HI;
1015 if (of_get_property(np, "st,wakeup-y-lo", NULL))
1016 pdata->wakeup_flags |= LIS3_WAKEUP_Y_LO;
1017 if (of_get_property(np, "st,wakeup-y-hi", NULL))
1018 pdata->wakeup_flags |= LIS3_WAKEUP_Y_HI;
1019 if (of_get_property(np, "st,wakeup-z-lo", NULL))
1020 pdata->wakeup_flags |= LIS3_WAKEUP_Z_LO;
1021 if (of_get_property(np, "st,wakeup-z-hi", NULL))
1022 pdata->wakeup_flags |= LIS3_WAKEUP_Z_HI;
1023 if (of_get_property(np, "st,wakeup-threshold", &val))
1024 pdata->wakeup_thresh = val;
1025
1026 if (of_get_property(np, "st,wakeup2-x-lo", NULL))
1027 pdata->wakeup_flags2 |= LIS3_WAKEUP_X_LO;
1028 if (of_get_property(np, "st,wakeup2-x-hi", NULL))
1029 pdata->wakeup_flags2 |= LIS3_WAKEUP_X_HI;
1030 if (of_get_property(np, "st,wakeup2-y-lo", NULL))
1031 pdata->wakeup_flags2 |= LIS3_WAKEUP_Y_LO;
1032 if (of_get_property(np, "st,wakeup2-y-hi", NULL))
1033 pdata->wakeup_flags2 |= LIS3_WAKEUP_Y_HI;
1034 if (of_get_property(np, "st,wakeup2-z-lo", NULL))
1035 pdata->wakeup_flags2 |= LIS3_WAKEUP_Z_LO;
1036 if (of_get_property(np, "st,wakeup2-z-hi", NULL))
1037 pdata->wakeup_flags2 |= LIS3_WAKEUP_Z_HI;
1038 if (of_get_property(np, "st,wakeup2-threshold", &val))
1039 pdata->wakeup_thresh2 = val;
1040
1041 if (!of_property_read_u32(np, "st,highpass-cutoff-hz", &val)) {
1042 switch (val) {
1043 case 1:
1044 pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_1HZ;
1045 break;
1046 case 2:
1047 pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_2HZ;
1048 break;
1049 case 4:
1050 pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_4HZ;
1051 break;
1052 case 8:
1053 pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_8HZ;
1054 break;
1055 }
1056 }
1057
1058 if (of_get_property(np, "st,hipass1-disable", NULL))
1059 pdata->hipass_ctrl |= LIS3_HIPASS1_DISABLE;
1060 if (of_get_property(np, "st,hipass2-disable", NULL))
1061 pdata->hipass_ctrl |= LIS3_HIPASS2_DISABLE;
1062
1063 if (of_property_read_s32(np, "st,axis-x", &sval) == 0)
1064 pdata->axis_x = sval;
1065 if (of_property_read_s32(np, "st,axis-y", &sval) == 0)
1066 pdata->axis_y = sval;
1067 if (of_property_read_s32(np, "st,axis-z", &sval) == 0)
1068 pdata->axis_z = sval;
1069
1070 if (of_get_property(np, "st,default-rate", NULL))
1071 pdata->default_rate = val;
1072
1073 if (of_property_read_s32(np, "st,min-limit-x", &sval) == 0)
1074 pdata->st_min_limits[0] = sval;
1075 if (of_property_read_s32(np, "st,min-limit-y", &sval) == 0)
1076 pdata->st_min_limits[1] = sval;
1077 if (of_property_read_s32(np, "st,min-limit-z", &sval) == 0)
1078 pdata->st_min_limits[2] = sval;
1079
1080 if (of_property_read_s32(np, "st,max-limit-x", &sval) == 0)
1081 pdata->st_max_limits[0] = sval;
1082 if (of_property_read_s32(np, "st,max-limit-y", &sval) == 0)
1083 pdata->st_max_limits[1] = sval;
1084 if (of_property_read_s32(np, "st,max-limit-z", &sval) == 0)
1085 pdata->st_max_limits[2] = sval;
1086
1087
1088 lis3->pdata = pdata;
1089
1090 return 0;
1091}
1092
1093#else
1094int lis3lv02d_init_dt(struct lis3lv02d *lis3)
1095{
1096 return 0;
1097}
1098#endif
1099EXPORT_SYMBOL_GPL(lis3lv02d_init_dt);
1100
1101/*
1102 * Initialise the accelerometer and the various subsystems.
1103 * Should be rather independent of the bus system.
1104 */
1105int lis3lv02d_init_device(struct lis3lv02d *lis3)
1106{
1107 int err;
1108 irq_handler_t thread_fn;
1109 int irq_flags = 0;
1110
1111 lis3->whoami = lis3lv02d_read_8(lis3, WHO_AM_I);
1112
1113 switch (lis3->whoami) {
1114 case WAI_12B:
1115 pr_info("12 bits sensor found\n");
1116 lis3->read_data = lis3lv02d_read_12;
1117 lis3->mdps_max_val = 2048;
1118 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_12B;
1119 lis3->odrs = lis3_12_rates;
1120 lis3->odr_mask = CTRL1_DF0 | CTRL1_DF1;
1121 lis3->scale = LIS3_SENSITIVITY_12B;
1122 lis3->regs = lis3_wai12_regs;
1123 lis3->regs_size = ARRAY_SIZE(lis3_wai12_regs);
1124 break;
1125 case WAI_8B:
1126 pr_info("8 bits sensor found\n");
1127 lis3->read_data = lis3lv02d_read_8;
1128 lis3->mdps_max_val = 128;
1129 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
1130 lis3->odrs = lis3_8_rates;
1131 lis3->odr_mask = CTRL1_DR;
1132 lis3->scale = LIS3_SENSITIVITY_8B;
1133 lis3->regs = lis3_wai8_regs;
1134 lis3->regs_size = ARRAY_SIZE(lis3_wai8_regs);
1135 break;
1136 case WAI_3DC:
1137 pr_info("8 bits 3DC sensor found\n");
1138 lis3->read_data = lis3lv02d_read_8;
1139 lis3->mdps_max_val = 128;
1140 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
1141 lis3->odrs = lis3_3dc_rates;
1142 lis3->odr_mask = CTRL1_ODR0|CTRL1_ODR1|CTRL1_ODR2|CTRL1_ODR3;
1143 lis3->scale = LIS3_SENSITIVITY_8B;
1144 break;
1145 case WAI_3DLH:
1146 pr_info("16 bits lis331dlh sensor found\n");
1147 lis3->read_data = lis331dlh_read_data;
1148 lis3->mdps_max_val = 2048; /* 12 bits for 2G */
1149 lis3->shift_adj = SHIFT_ADJ_2G;
1150 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
1151 lis3->odrs = lis3_3dlh_rates;
1152 lis3->odr_mask = CTRL1_DR0 | CTRL1_DR1;
1153 lis3->scale = LIS3DLH_SENSITIVITY_2G;
1154 break;
1155 default:
1156 pr_err("unknown sensor type 0x%X\n", lis3->whoami);
1157 return -EINVAL;
1158 }
1159
1160 lis3->reg_cache = kzalloc(max(sizeof(lis3_wai8_regs),
1161 sizeof(lis3_wai12_regs)), GFP_KERNEL);
1162
1163 if (lis3->reg_cache == NULL) {
1164 printk(KERN_ERR DRIVER_NAME "out of memory\n");
1165 return -ENOMEM;
1166 }
1167
1168 mutex_init(&lis3->mutex);
1169 atomic_set(&lis3->wake_thread, 0);
1170
1171 lis3lv02d_add_fs(lis3);
1172 err = lis3lv02d_poweron(lis3);
1173 if (err) {
1174 lis3lv02d_remove_fs(lis3);
1175 return err;
1176 }
1177
1178 if (lis3->pm_dev) {
1179 pm_runtime_set_active(lis3->pm_dev);
1180 pm_runtime_enable(lis3->pm_dev);
1181 }
1182
1183 if (lis3lv02d_joystick_enable(lis3))
1184 pr_err("joystick initialization failed\n");
1185
1186 /* passing in platform specific data is purely optional and only
1187 * used by the SPI transport layer at the moment */
1188 if (lis3->pdata) {
1189 struct lis3lv02d_platform_data *p = lis3->pdata;
1190
1191 if (lis3->whoami == WAI_8B)
1192 lis3lv02d_8b_configure(lis3, p);
1193
1194 irq_flags = p->irq_flags1 & IRQF_TRIGGER_MASK;
1195
1196 lis3->irq_cfg = p->irq_cfg;
1197 if (p->irq_cfg)
1198 lis3->write(lis3, CTRL_REG3, p->irq_cfg);
1199
1200 if (p->default_rate)
1201 lis3lv02d_set_odr(lis3, p->default_rate);
1202 }
1203
1204 /* bail if we did not get an IRQ from the bus layer */
1205 if (!lis3->irq) {
1206 pr_debug("No IRQ. Disabling /dev/freefall\n");
1207 goto out;
1208 }
1209
1210 /*
1211 * The sensor can generate interrupts for free-fall and direction
1212 * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep
1213 * the things simple and _fast_ we activate it only for free-fall, so
1214 * no need to read register (very slow with ACPI). For the same reason,
1215 * we forbid shared interrupts.
1216 *
1217 * IRQF_TRIGGER_RISING seems pointless on HP laptops because the
1218 * io-apic is not configurable (and generates a warning) but I keep it
1219 * in case of support for other hardware.
1220 */
1221 if (lis3->pdata && lis3->whoami == WAI_8B)
1222 thread_fn = lis302dl_interrupt_thread1_8b;
1223 else
1224 thread_fn = NULL;
1225
1226 err = request_threaded_irq(lis3->irq, lis302dl_interrupt,
1227 thread_fn,
1228 IRQF_TRIGGER_RISING | IRQF_ONESHOT |
1229 irq_flags,
1230 DRIVER_NAME, lis3);
1231
1232 if (err < 0) {
1233 pr_err("Cannot get IRQ\n");
1234 goto out;
1235 }
1236
1237 lis3->miscdev.minor = MISC_DYNAMIC_MINOR;
1238 lis3->miscdev.name = "freefall";
1239 lis3->miscdev.fops = &lis3lv02d_misc_fops;
1240
1241 if (misc_register(&lis3->miscdev))
1242 pr_err("misc_register failed\n");
1243out:
1244 return 0;
1245}
1246EXPORT_SYMBOL_GPL(lis3lv02d_init_device);
1247
1248MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
1249MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
1250MODULE_LICENSE("GPL");