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.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 
85 struct lis3lv02d lis3_dev = {
86 	.misc_wait   = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait),
87 };
88 EXPORT_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  */
93 static 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 
106 static 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 
113 module_param_array_named(axes, lis3_dev.ac.as_array, axis, NULL, 0644);
114 MODULE_PARM_DESC(axes, "Axis-mapping for x,y,z directions");
115 
116 static 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 
125 static 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 */
136 static 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  */
155 static 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  */
172 static 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 */
205 static int lis3_12_rates[4] = {40, 160, 640, 2560};
206 static int lis3_8_rates[2] = {100, 400};
207 static int lis3_3dc_rates[16] = {0, 1, 10, 25, 50, 100, 200, 400, 1600, 5000};
208 static int lis3_3dlh_rates[4] = {50, 100, 400, 1000};
209 
210 /* ODR is Output Data Rate */
211 static 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 
222 static 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 
234 static 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 
256 static 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, &reg);
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 */
347 fail:
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  */
357 static 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 
363 static 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 
368 static 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 
376 static 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 
384 void 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 }
393 EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);
394 
395 int 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, &reg);
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, &reg);
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 }
434 EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
435 
436 
437 static void lis3lv02d_joystick_poll(struct input_dev *input)
438 {
439 	struct lis3lv02d *lis3 = input_get_drvdata(input);
440 	int x, y, z;
441 
442 	mutex_lock(&lis3->mutex);
443 	lis3lv02d_get_xyz(lis3, &x, &y, &z);
444 	input_report_abs(input, ABS_X, x);
445 	input_report_abs(input, ABS_Y, y);
446 	input_report_abs(input, ABS_Z, z);
447 	input_sync(input);
448 	mutex_unlock(&lis3->mutex);
449 }
450 
451 static int lis3lv02d_joystick_open(struct input_dev *input)
452 {
453 	struct lis3lv02d *lis3 = input_get_drvdata(input);
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(input);
465 
466 	return 0;
467 }
468 
469 static void lis3lv02d_joystick_close(struct input_dev *input)
470 {
471 	struct lis3lv02d *lis3 = input_get_drvdata(input);
472 
473 	atomic_set(&lis3->wake_thread, 0);
474 	if (lis3->pm_dev)
475 		pm_runtime_put(lis3->pm_dev);
476 }
477 
478 static irqreturn_t lis302dl_interrupt(int irq, void *data)
479 {
480 	struct lis3lv02d *lis3 = data;
481 
482 	if (!test_bit(0, &lis3->misc_opened))
483 		goto out;
484 
485 	/*
486 	 * Be careful: on some HP laptops the bios force DD when on battery and
487 	 * the lid is closed. This leads to interrupts as soon as a little move
488 	 * is done.
489 	 */
490 	atomic_inc(&lis3->count);
491 
492 	wake_up_interruptible(&lis3->misc_wait);
493 	kill_fasync(&lis3->async_queue, SIGIO, POLL_IN);
494 out:
495 	if (atomic_read(&lis3->wake_thread))
496 		return IRQ_WAKE_THREAD;
497 	return IRQ_HANDLED;
498 }
499 
500 static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3)
501 {
502 	struct input_dev *dev = lis3->idev;
503 	u8 click_src;
504 
505 	mutex_lock(&lis3->mutex);
506 	lis3->read(lis3, CLICK_SRC, &click_src);
507 
508 	if (click_src & CLICK_SINGLE_X) {
509 		input_report_key(dev, lis3->mapped_btns[0], 1);
510 		input_report_key(dev, lis3->mapped_btns[0], 0);
511 	}
512 
513 	if (click_src & CLICK_SINGLE_Y) {
514 		input_report_key(dev, lis3->mapped_btns[1], 1);
515 		input_report_key(dev, lis3->mapped_btns[1], 0);
516 	}
517 
518 	if (click_src & CLICK_SINGLE_Z) {
519 		input_report_key(dev, lis3->mapped_btns[2], 1);
520 		input_report_key(dev, lis3->mapped_btns[2], 0);
521 	}
522 	input_sync(dev);
523 	mutex_unlock(&lis3->mutex);
524 }
525 
526 static inline void lis302dl_data_ready(struct lis3lv02d *lis3, int index)
527 {
528 	int dummy;
529 
530 	/* Dummy read to ack interrupt */
531 	lis3lv02d_get_xyz(lis3, &dummy, &dummy, &dummy);
532 	lis3->data_ready_count[index]++;
533 }
534 
535 static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data)
536 {
537 	struct lis3lv02d *lis3 = data;
538 	u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ1_MASK;
539 
540 	if (irq_cfg == LIS3_IRQ1_CLICK)
541 		lis302dl_interrupt_handle_click(lis3);
542 	else if (unlikely(irq_cfg == LIS3_IRQ1_DATA_READY))
543 		lis302dl_data_ready(lis3, IRQ_LINE0);
544 	else
545 		lis3lv02d_joystick_poll(lis3->idev);
546 
547 	return IRQ_HANDLED;
548 }
549 
550 static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data)
551 {
552 	struct lis3lv02d *lis3 = data;
553 	u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ2_MASK;
554 
555 	if (irq_cfg == LIS3_IRQ2_CLICK)
556 		lis302dl_interrupt_handle_click(lis3);
557 	else if (unlikely(irq_cfg == LIS3_IRQ2_DATA_READY))
558 		lis302dl_data_ready(lis3, IRQ_LINE1);
559 	else
560 		lis3lv02d_joystick_poll(lis3->idev);
561 
562 	return IRQ_HANDLED;
563 }
564 
565 static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
566 {
567 	struct lis3lv02d *lis3 = container_of(file->private_data,
568 					      struct lis3lv02d, miscdev);
569 
570 	if (test_and_set_bit(0, &lis3->misc_opened))
571 		return -EBUSY; /* already open */
572 
573 	if (lis3->pm_dev)
574 		pm_runtime_get_sync(lis3->pm_dev);
575 
576 	atomic_set(&lis3->count, 0);
577 	return 0;
578 }
579 
580 static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
581 {
582 	struct lis3lv02d *lis3 = container_of(file->private_data,
583 					      struct lis3lv02d, miscdev);
584 
585 	clear_bit(0, &lis3->misc_opened); /* release the device */
586 	if (lis3->pm_dev)
587 		pm_runtime_put(lis3->pm_dev);
588 	return 0;
589 }
590 
591 static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf,
592 				size_t count, loff_t *pos)
593 {
594 	struct lis3lv02d *lis3 = container_of(file->private_data,
595 					      struct lis3lv02d, miscdev);
596 
597 	DECLARE_WAITQUEUE(wait, current);
598 	u32 data;
599 	unsigned char byte_data;
600 	ssize_t retval = 1;
601 
602 	if (count < 1)
603 		return -EINVAL;
604 
605 	add_wait_queue(&lis3->misc_wait, &wait);
606 	while (true) {
607 		set_current_state(TASK_INTERRUPTIBLE);
608 		data = atomic_xchg(&lis3->count, 0);
609 		if (data)
610 			break;
611 
612 		if (file->f_flags & O_NONBLOCK) {
613 			retval = -EAGAIN;
614 			goto out;
615 		}
616 
617 		if (signal_pending(current)) {
618 			retval = -ERESTARTSYS;
619 			goto out;
620 		}
621 
622 		schedule();
623 	}
624 
625 	if (data < 255)
626 		byte_data = data;
627 	else
628 		byte_data = 255;
629 
630 	/* make sure we are not going into copy_to_user() with
631 	 * TASK_INTERRUPTIBLE state */
632 	set_current_state(TASK_RUNNING);
633 	if (copy_to_user(buf, &byte_data, sizeof(byte_data)))
634 		retval = -EFAULT;
635 
636 out:
637 	__set_current_state(TASK_RUNNING);
638 	remove_wait_queue(&lis3->misc_wait, &wait);
639 
640 	return retval;
641 }
642 
643 static __poll_t lis3lv02d_misc_poll(struct file *file, poll_table *wait)
644 {
645 	struct lis3lv02d *lis3 = container_of(file->private_data,
646 					      struct lis3lv02d, miscdev);
647 
648 	poll_wait(file, &lis3->misc_wait, wait);
649 	if (atomic_read(&lis3->count))
650 		return EPOLLIN | EPOLLRDNORM;
651 	return 0;
652 }
653 
654 static int lis3lv02d_misc_fasync(int fd, struct file *file, int on)
655 {
656 	struct lis3lv02d *lis3 = container_of(file->private_data,
657 					      struct lis3lv02d, miscdev);
658 
659 	return fasync_helper(fd, file, on, &lis3->async_queue);
660 }
661 
662 static const struct file_operations lis3lv02d_misc_fops = {
663 	.owner   = THIS_MODULE,
664 	.llseek  = no_llseek,
665 	.read    = lis3lv02d_misc_read,
666 	.open    = lis3lv02d_misc_open,
667 	.release = lis3lv02d_misc_release,
668 	.poll    = lis3lv02d_misc_poll,
669 	.fasync  = lis3lv02d_misc_fasync,
670 };
671 
672 int lis3lv02d_joystick_enable(struct lis3lv02d *lis3)
673 {
674 	struct input_dev *input_dev;
675 	int err;
676 	int max_val, fuzz, flat;
677 	int btns[] = {BTN_X, BTN_Y, BTN_Z};
678 
679 	if (lis3->idev)
680 		return -EINVAL;
681 
682 	input_dev = input_allocate_device();
683 	if (!input_dev)
684 		return -ENOMEM;
685 
686 	input_dev->name       = "ST LIS3LV02DL Accelerometer";
687 	input_dev->phys       = DRIVER_NAME "/input0";
688 	input_dev->id.bustype = BUS_HOST;
689 	input_dev->id.vendor  = 0;
690 	input_dev->dev.parent = &lis3->pdev->dev;
691 
692 	input_dev->open = lis3lv02d_joystick_open;
693 	input_dev->close = lis3lv02d_joystick_close;
694 
695 	max_val = (lis3->mdps_max_val * lis3->scale) / LIS3_ACCURACY;
696 	if (lis3->whoami == WAI_12B) {
697 		fuzz = LIS3_DEFAULT_FUZZ_12B;
698 		flat = LIS3_DEFAULT_FLAT_12B;
699 	} else {
700 		fuzz = LIS3_DEFAULT_FUZZ_8B;
701 		flat = LIS3_DEFAULT_FLAT_8B;
702 	}
703 	fuzz = (fuzz * lis3->scale) / LIS3_ACCURACY;
704 	flat = (flat * lis3->scale) / LIS3_ACCURACY;
705 
706 	input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat);
707 	input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat);
708 	input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat);
709 
710 	input_set_drvdata(input_dev, lis3);
711 	lis3->idev = input_dev;
712 
713 	err = input_setup_polling(input_dev, lis3lv02d_joystick_poll);
714 	if (err)
715 		goto err_free_input;
716 
717 	input_set_poll_interval(input_dev, MDPS_POLL_INTERVAL);
718 	input_set_min_poll_interval(input_dev, MDPS_POLL_MIN);
719 	input_set_max_poll_interval(input_dev, MDPS_POLL_MAX);
720 
721 	lis3->mapped_btns[0] = lis3lv02d_get_axis(abs(lis3->ac.x), btns);
722 	lis3->mapped_btns[1] = lis3lv02d_get_axis(abs(lis3->ac.y), btns);
723 	lis3->mapped_btns[2] = lis3lv02d_get_axis(abs(lis3->ac.z), btns);
724 
725 	err = input_register_device(lis3->idev);
726 	if (err)
727 		goto err_free_input;
728 
729 	return 0;
730 
731 err_free_input:
732 	input_free_device(input_dev);
733 	lis3->idev = NULL;
734 	return err;
735 
736 }
737 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
738 
739 void lis3lv02d_joystick_disable(struct lis3lv02d *lis3)
740 {
741 	if (lis3->irq)
742 		free_irq(lis3->irq, lis3);
743 	if (lis3->pdata && lis3->pdata->irq2)
744 		free_irq(lis3->pdata->irq2, lis3);
745 
746 	if (!lis3->idev)
747 		return;
748 
749 	if (lis3->irq)
750 		misc_deregister(&lis3->miscdev);
751 	input_unregister_device(lis3->idev);
752 	lis3->idev = NULL;
753 }
754 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
755 
756 /* Sysfs stuff */
757 static void lis3lv02d_sysfs_poweron(struct lis3lv02d *lis3)
758 {
759 	/*
760 	 * SYSFS functions are fast visitors so put-call
761 	 * immediately after the get-call. However, keep
762 	 * chip running for a while and schedule delayed
763 	 * suspend. This way periodic sysfs calls doesn't
764 	 * suffer from relatively long power up time.
765 	 */
766 
767 	if (lis3->pm_dev) {
768 		pm_runtime_get_sync(lis3->pm_dev);
769 		pm_runtime_put_noidle(lis3->pm_dev);
770 		pm_schedule_suspend(lis3->pm_dev, LIS3_SYSFS_POWERDOWN_DELAY);
771 	}
772 }
773 
774 static ssize_t lis3lv02d_selftest_show(struct device *dev,
775 				struct device_attribute *attr, char *buf)
776 {
777 	struct lis3lv02d *lis3 = dev_get_drvdata(dev);
778 	s16 values[3];
779 
780 	static const char ok[] = "OK";
781 	static const char fail[] = "FAIL";
782 	static const char irq[] = "FAIL_IRQ";
783 	const char *res;
784 
785 	lis3lv02d_sysfs_poweron(lis3);
786 	switch (lis3lv02d_selftest(lis3, values)) {
787 	case SELFTEST_FAIL:
788 		res = fail;
789 		break;
790 	case SELFTEST_IRQ:
791 		res = irq;
792 		break;
793 	case SELFTEST_OK:
794 	default:
795 		res = ok;
796 		break;
797 	}
798 	return sprintf(buf, "%s %d %d %d\n", res,
799 		values[0], values[1], values[2]);
800 }
801 
802 static ssize_t lis3lv02d_position_show(struct device *dev,
803 				struct device_attribute *attr, char *buf)
804 {
805 	struct lis3lv02d *lis3 = dev_get_drvdata(dev);
806 	int x, y, z;
807 
808 	lis3lv02d_sysfs_poweron(lis3);
809 	mutex_lock(&lis3->mutex);
810 	lis3lv02d_get_xyz(lis3, &x, &y, &z);
811 	mutex_unlock(&lis3->mutex);
812 	return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
813 }
814 
815 static ssize_t lis3lv02d_rate_show(struct device *dev,
816 			struct device_attribute *attr, char *buf)
817 {
818 	struct lis3lv02d *lis3 = dev_get_drvdata(dev);
819 
820 	lis3lv02d_sysfs_poweron(lis3);
821 	return sprintf(buf, "%d\n", lis3lv02d_get_odr(lis3));
822 }
823 
824 static ssize_t lis3lv02d_rate_set(struct device *dev,
825 				struct device_attribute *attr, const char *buf,
826 				size_t count)
827 {
828 	struct lis3lv02d *lis3 = dev_get_drvdata(dev);
829 	unsigned long rate;
830 	int ret;
831 
832 	ret = kstrtoul(buf, 0, &rate);
833 	if (ret)
834 		return ret;
835 
836 	lis3lv02d_sysfs_poweron(lis3);
837 	if (lis3lv02d_set_odr(lis3, rate))
838 		return -EINVAL;
839 
840 	return count;
841 }
842 
843 static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL);
844 static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
845 static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show,
846 					    lis3lv02d_rate_set);
847 
848 static struct attribute *lis3lv02d_attributes[] = {
849 	&dev_attr_selftest.attr,
850 	&dev_attr_position.attr,
851 	&dev_attr_rate.attr,
852 	NULL
853 };
854 
855 static const struct attribute_group lis3lv02d_attribute_group = {
856 	.attrs = lis3lv02d_attributes
857 };
858 
859 
860 static int lis3lv02d_add_fs(struct lis3lv02d *lis3)
861 {
862 	lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
863 	if (IS_ERR(lis3->pdev))
864 		return PTR_ERR(lis3->pdev);
865 
866 	platform_set_drvdata(lis3->pdev, lis3);
867 	return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
868 }
869 
870 int lis3lv02d_remove_fs(struct lis3lv02d *lis3)
871 {
872 	sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
873 	platform_device_unregister(lis3->pdev);
874 	if (lis3->pm_dev) {
875 		/* Barrier after the sysfs remove */
876 		pm_runtime_barrier(lis3->pm_dev);
877 
878 		/* SYSFS may have left chip running. Turn off if necessary */
879 		if (!pm_runtime_suspended(lis3->pm_dev))
880 			lis3lv02d_poweroff(lis3);
881 
882 		pm_runtime_disable(lis3->pm_dev);
883 		pm_runtime_set_suspended(lis3->pm_dev);
884 	}
885 	kfree(lis3->reg_cache);
886 	return 0;
887 }
888 EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
889 
890 static void lis3lv02d_8b_configure(struct lis3lv02d *lis3,
891 				struct lis3lv02d_platform_data *p)
892 {
893 	int err;
894 	int ctrl2 = p->hipass_ctrl;
895 
896 	if (p->click_flags) {
897 		lis3->write(lis3, CLICK_CFG, p->click_flags);
898 		lis3->write(lis3, CLICK_TIMELIMIT, p->click_time_limit);
899 		lis3->write(lis3, CLICK_LATENCY, p->click_latency);
900 		lis3->write(lis3, CLICK_WINDOW, p->click_window);
901 		lis3->write(lis3, CLICK_THSZ, p->click_thresh_z & 0xf);
902 		lis3->write(lis3, CLICK_THSY_X,
903 			(p->click_thresh_x & 0xf) |
904 			(p->click_thresh_y << 4));
905 
906 		if (lis3->idev) {
907 			input_set_capability(lis3->idev, EV_KEY, BTN_X);
908 			input_set_capability(lis3->idev, EV_KEY, BTN_Y);
909 			input_set_capability(lis3->idev, EV_KEY, BTN_Z);
910 		}
911 	}
912 
913 	if (p->wakeup_flags) {
914 		lis3->write(lis3, FF_WU_CFG_1, p->wakeup_flags);
915 		lis3->write(lis3, FF_WU_THS_1, p->wakeup_thresh & 0x7f);
916 		/* pdata value + 1 to keep this backward compatible*/
917 		lis3->write(lis3, FF_WU_DURATION_1, p->duration1 + 1);
918 		ctrl2 ^= HP_FF_WU1; /* Xor to keep compatible with old pdata*/
919 	}
920 
921 	if (p->wakeup_flags2) {
922 		lis3->write(lis3, FF_WU_CFG_2, p->wakeup_flags2);
923 		lis3->write(lis3, FF_WU_THS_2, p->wakeup_thresh2 & 0x7f);
924 		/* pdata value + 1 to keep this backward compatible*/
925 		lis3->write(lis3, FF_WU_DURATION_2, p->duration2 + 1);
926 		ctrl2 ^= HP_FF_WU2; /* Xor to keep compatible with old pdata*/
927 	}
928 	/* Configure hipass filters */
929 	lis3->write(lis3, CTRL_REG2, ctrl2);
930 
931 	if (p->irq2) {
932 		err = request_threaded_irq(p->irq2,
933 					NULL,
934 					lis302dl_interrupt_thread2_8b,
935 					IRQF_TRIGGER_RISING | IRQF_ONESHOT |
936 					(p->irq_flags2 & IRQF_TRIGGER_MASK),
937 					DRIVER_NAME, lis3);
938 		if (err < 0)
939 			pr_err("No second IRQ. Limited functionality\n");
940 	}
941 }
942 
943 #ifdef CONFIG_OF
944 int lis3lv02d_init_dt(struct lis3lv02d *lis3)
945 {
946 	struct lis3lv02d_platform_data *pdata;
947 	struct device_node *np = lis3->of_node;
948 	u32 val;
949 	s32 sval;
950 
951 	if (!lis3->of_node)
952 		return 0;
953 
954 	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
955 	if (!pdata)
956 		return -ENOMEM;
957 
958 	if (of_get_property(np, "st,click-single-x", NULL))
959 		pdata->click_flags |= LIS3_CLICK_SINGLE_X;
960 	if (of_get_property(np, "st,click-double-x", NULL))
961 		pdata->click_flags |= LIS3_CLICK_DOUBLE_X;
962 
963 	if (of_get_property(np, "st,click-single-y", NULL))
964 		pdata->click_flags |= LIS3_CLICK_SINGLE_Y;
965 	if (of_get_property(np, "st,click-double-y", NULL))
966 		pdata->click_flags |= LIS3_CLICK_DOUBLE_Y;
967 
968 	if (of_get_property(np, "st,click-single-z", NULL))
969 		pdata->click_flags |= LIS3_CLICK_SINGLE_Z;
970 	if (of_get_property(np, "st,click-double-z", NULL))
971 		pdata->click_flags |= LIS3_CLICK_DOUBLE_Z;
972 
973 	if (!of_property_read_u32(np, "st,click-threshold-x", &val))
974 		pdata->click_thresh_x = val;
975 	if (!of_property_read_u32(np, "st,click-threshold-y", &val))
976 		pdata->click_thresh_y = val;
977 	if (!of_property_read_u32(np, "st,click-threshold-z", &val))
978 		pdata->click_thresh_z = val;
979 
980 	if (!of_property_read_u32(np, "st,click-time-limit", &val))
981 		pdata->click_time_limit = val;
982 	if (!of_property_read_u32(np, "st,click-latency", &val))
983 		pdata->click_latency = val;
984 	if (!of_property_read_u32(np, "st,click-window", &val))
985 		pdata->click_window = val;
986 
987 	if (of_get_property(np, "st,irq1-disable", NULL))
988 		pdata->irq_cfg |= LIS3_IRQ1_DISABLE;
989 	if (of_get_property(np, "st,irq1-ff-wu-1", NULL))
990 		pdata->irq_cfg |= LIS3_IRQ1_FF_WU_1;
991 	if (of_get_property(np, "st,irq1-ff-wu-2", NULL))
992 		pdata->irq_cfg |= LIS3_IRQ1_FF_WU_2;
993 	if (of_get_property(np, "st,irq1-data-ready", NULL))
994 		pdata->irq_cfg |= LIS3_IRQ1_DATA_READY;
995 	if (of_get_property(np, "st,irq1-click", NULL))
996 		pdata->irq_cfg |= LIS3_IRQ1_CLICK;
997 
998 	if (of_get_property(np, "st,irq2-disable", NULL))
999 		pdata->irq_cfg |= LIS3_IRQ2_DISABLE;
1000 	if (of_get_property(np, "st,irq2-ff-wu-1", NULL))
1001 		pdata->irq_cfg |= LIS3_IRQ2_FF_WU_1;
1002 	if (of_get_property(np, "st,irq2-ff-wu-2", NULL))
1003 		pdata->irq_cfg |= LIS3_IRQ2_FF_WU_2;
1004 	if (of_get_property(np, "st,irq2-data-ready", NULL))
1005 		pdata->irq_cfg |= LIS3_IRQ2_DATA_READY;
1006 	if (of_get_property(np, "st,irq2-click", NULL))
1007 		pdata->irq_cfg |= LIS3_IRQ2_CLICK;
1008 
1009 	if (of_get_property(np, "st,irq-open-drain", NULL))
1010 		pdata->irq_cfg |= LIS3_IRQ_OPEN_DRAIN;
1011 	if (of_get_property(np, "st,irq-active-low", NULL))
1012 		pdata->irq_cfg |= LIS3_IRQ_ACTIVE_LOW;
1013 
1014 	if (!of_property_read_u32(np, "st,wu-duration-1", &val))
1015 		pdata->duration1 = val;
1016 	if (!of_property_read_u32(np, "st,wu-duration-2", &val))
1017 		pdata->duration2 = val;
1018 
1019 	if (of_get_property(np, "st,wakeup-x-lo", NULL))
1020 		pdata->wakeup_flags |= LIS3_WAKEUP_X_LO;
1021 	if (of_get_property(np, "st,wakeup-x-hi", NULL))
1022 		pdata->wakeup_flags |= LIS3_WAKEUP_X_HI;
1023 	if (of_get_property(np, "st,wakeup-y-lo", NULL))
1024 		pdata->wakeup_flags |= LIS3_WAKEUP_Y_LO;
1025 	if (of_get_property(np, "st,wakeup-y-hi", NULL))
1026 		pdata->wakeup_flags |= LIS3_WAKEUP_Y_HI;
1027 	if (of_get_property(np, "st,wakeup-z-lo", NULL))
1028 		pdata->wakeup_flags |= LIS3_WAKEUP_Z_LO;
1029 	if (of_get_property(np, "st,wakeup-z-hi", NULL))
1030 		pdata->wakeup_flags |= LIS3_WAKEUP_Z_HI;
1031 	if (of_get_property(np, "st,wakeup-threshold", &val))
1032 		pdata->wakeup_thresh = val;
1033 
1034 	if (of_get_property(np, "st,wakeup2-x-lo", NULL))
1035 		pdata->wakeup_flags2 |= LIS3_WAKEUP_X_LO;
1036 	if (of_get_property(np, "st,wakeup2-x-hi", NULL))
1037 		pdata->wakeup_flags2 |= LIS3_WAKEUP_X_HI;
1038 	if (of_get_property(np, "st,wakeup2-y-lo", NULL))
1039 		pdata->wakeup_flags2 |= LIS3_WAKEUP_Y_LO;
1040 	if (of_get_property(np, "st,wakeup2-y-hi", NULL))
1041 		pdata->wakeup_flags2 |= LIS3_WAKEUP_Y_HI;
1042 	if (of_get_property(np, "st,wakeup2-z-lo", NULL))
1043 		pdata->wakeup_flags2 |= LIS3_WAKEUP_Z_LO;
1044 	if (of_get_property(np, "st,wakeup2-z-hi", NULL))
1045 		pdata->wakeup_flags2 |= LIS3_WAKEUP_Z_HI;
1046 	if (of_get_property(np, "st,wakeup2-threshold", &val))
1047 		pdata->wakeup_thresh2 = val;
1048 
1049 	if (!of_property_read_u32(np, "st,highpass-cutoff-hz", &val)) {
1050 		switch (val) {
1051 		case 1:
1052 			pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_1HZ;
1053 			break;
1054 		case 2:
1055 			pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_2HZ;
1056 			break;
1057 		case 4:
1058 			pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_4HZ;
1059 			break;
1060 		case 8:
1061 			pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_8HZ;
1062 			break;
1063 		}
1064 	}
1065 
1066 	if (of_get_property(np, "st,hipass1-disable", NULL))
1067 		pdata->hipass_ctrl |= LIS3_HIPASS1_DISABLE;
1068 	if (of_get_property(np, "st,hipass2-disable", NULL))
1069 		pdata->hipass_ctrl |= LIS3_HIPASS2_DISABLE;
1070 
1071 	if (of_property_read_s32(np, "st,axis-x", &sval) == 0)
1072 		pdata->axis_x = sval;
1073 	if (of_property_read_s32(np, "st,axis-y", &sval) == 0)
1074 		pdata->axis_y = sval;
1075 	if (of_property_read_s32(np, "st,axis-z", &sval) == 0)
1076 		pdata->axis_z = sval;
1077 
1078 	if (of_get_property(np, "st,default-rate", NULL))
1079 		pdata->default_rate = val;
1080 
1081 	if (of_property_read_s32(np, "st,min-limit-x", &sval) == 0)
1082 		pdata->st_min_limits[0] = sval;
1083 	if (of_property_read_s32(np, "st,min-limit-y", &sval) == 0)
1084 		pdata->st_min_limits[1] = sval;
1085 	if (of_property_read_s32(np, "st,min-limit-z", &sval) == 0)
1086 		pdata->st_min_limits[2] = sval;
1087 
1088 	if (of_property_read_s32(np, "st,max-limit-x", &sval) == 0)
1089 		pdata->st_max_limits[0] = sval;
1090 	if (of_property_read_s32(np, "st,max-limit-y", &sval) == 0)
1091 		pdata->st_max_limits[1] = sval;
1092 	if (of_property_read_s32(np, "st,max-limit-z", &sval) == 0)
1093 		pdata->st_max_limits[2] = sval;
1094 
1095 
1096 	lis3->pdata = pdata;
1097 
1098 	return 0;
1099 }
1100 
1101 #else
1102 int lis3lv02d_init_dt(struct lis3lv02d *lis3)
1103 {
1104 	return 0;
1105 }
1106 #endif
1107 EXPORT_SYMBOL_GPL(lis3lv02d_init_dt);
1108 
1109 /*
1110  * Initialise the accelerometer and the various subsystems.
1111  * Should be rather independent of the bus system.
1112  */
1113 int lis3lv02d_init_device(struct lis3lv02d *lis3)
1114 {
1115 	int err;
1116 	irq_handler_t thread_fn;
1117 	int irq_flags = 0;
1118 
1119 	lis3->whoami = lis3lv02d_read_8(lis3, WHO_AM_I);
1120 
1121 	switch (lis3->whoami) {
1122 	case WAI_12B:
1123 		pr_info("12 bits sensor found\n");
1124 		lis3->read_data = lis3lv02d_read_12;
1125 		lis3->mdps_max_val = 2048;
1126 		lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_12B;
1127 		lis3->odrs = lis3_12_rates;
1128 		lis3->odr_mask = CTRL1_DF0 | CTRL1_DF1;
1129 		lis3->scale = LIS3_SENSITIVITY_12B;
1130 		lis3->regs = lis3_wai12_regs;
1131 		lis3->regs_size = ARRAY_SIZE(lis3_wai12_regs);
1132 		break;
1133 	case WAI_8B:
1134 		pr_info("8 bits sensor found\n");
1135 		lis3->read_data = lis3lv02d_read_8;
1136 		lis3->mdps_max_val = 128;
1137 		lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
1138 		lis3->odrs = lis3_8_rates;
1139 		lis3->odr_mask = CTRL1_DR;
1140 		lis3->scale = LIS3_SENSITIVITY_8B;
1141 		lis3->regs = lis3_wai8_regs;
1142 		lis3->regs_size = ARRAY_SIZE(lis3_wai8_regs);
1143 		break;
1144 	case WAI_3DC:
1145 		pr_info("8 bits 3DC sensor found\n");
1146 		lis3->read_data = lis3lv02d_read_8;
1147 		lis3->mdps_max_val = 128;
1148 		lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
1149 		lis3->odrs = lis3_3dc_rates;
1150 		lis3->odr_mask = CTRL1_ODR0|CTRL1_ODR1|CTRL1_ODR2|CTRL1_ODR3;
1151 		lis3->scale = LIS3_SENSITIVITY_8B;
1152 		break;
1153 	case WAI_3DLH:
1154 		pr_info("16 bits lis331dlh sensor found\n");
1155 		lis3->read_data = lis331dlh_read_data;
1156 		lis3->mdps_max_val = 2048; /* 12 bits for 2G */
1157 		lis3->shift_adj = SHIFT_ADJ_2G;
1158 		lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
1159 		lis3->odrs = lis3_3dlh_rates;
1160 		lis3->odr_mask = CTRL1_DR0 | CTRL1_DR1;
1161 		lis3->scale = LIS3DLH_SENSITIVITY_2G;
1162 		break;
1163 	default:
1164 		pr_err("unknown sensor type 0x%X\n", lis3->whoami);
1165 		return -EINVAL;
1166 	}
1167 
1168 	lis3->reg_cache = kzalloc(max(sizeof(lis3_wai8_regs),
1169 				     sizeof(lis3_wai12_regs)), GFP_KERNEL);
1170 
1171 	if (lis3->reg_cache == NULL) {
1172 		printk(KERN_ERR DRIVER_NAME "out of memory\n");
1173 		return -ENOMEM;
1174 	}
1175 
1176 	mutex_init(&lis3->mutex);
1177 	atomic_set(&lis3->wake_thread, 0);
1178 
1179 	lis3lv02d_add_fs(lis3);
1180 	err = lis3lv02d_poweron(lis3);
1181 	if (err) {
1182 		lis3lv02d_remove_fs(lis3);
1183 		return err;
1184 	}
1185 
1186 	if (lis3->pm_dev) {
1187 		pm_runtime_set_active(lis3->pm_dev);
1188 		pm_runtime_enable(lis3->pm_dev);
1189 	}
1190 
1191 	if (lis3lv02d_joystick_enable(lis3))
1192 		pr_err("joystick initialization failed\n");
1193 
1194 	/* passing in platform specific data is purely optional and only
1195 	 * used by the SPI transport layer at the moment */
1196 	if (lis3->pdata) {
1197 		struct lis3lv02d_platform_data *p = lis3->pdata;
1198 
1199 		if (lis3->whoami == WAI_8B)
1200 			lis3lv02d_8b_configure(lis3, p);
1201 
1202 		irq_flags = p->irq_flags1 & IRQF_TRIGGER_MASK;
1203 
1204 		lis3->irq_cfg = p->irq_cfg;
1205 		if (p->irq_cfg)
1206 			lis3->write(lis3, CTRL_REG3, p->irq_cfg);
1207 
1208 		if (p->default_rate)
1209 			lis3lv02d_set_odr(lis3, p->default_rate);
1210 	}
1211 
1212 	/* bail if we did not get an IRQ from the bus layer */
1213 	if (!lis3->irq) {
1214 		pr_debug("No IRQ. Disabling /dev/freefall\n");
1215 		goto out;
1216 	}
1217 
1218 	/*
1219 	 * The sensor can generate interrupts for free-fall and direction
1220 	 * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep
1221 	 * the things simple and _fast_ we activate it only for free-fall, so
1222 	 * no need to read register (very slow with ACPI). For the same reason,
1223 	 * we forbid shared interrupts.
1224 	 *
1225 	 * IRQF_TRIGGER_RISING seems pointless on HP laptops because the
1226 	 * io-apic is not configurable (and generates a warning) but I keep it
1227 	 * in case of support for other hardware.
1228 	 */
1229 	if (lis3->pdata && lis3->whoami == WAI_8B)
1230 		thread_fn = lis302dl_interrupt_thread1_8b;
1231 	else
1232 		thread_fn = NULL;
1233 
1234 	err = request_threaded_irq(lis3->irq, lis302dl_interrupt,
1235 				thread_fn,
1236 				IRQF_TRIGGER_RISING | IRQF_ONESHOT |
1237 				irq_flags,
1238 				DRIVER_NAME, lis3);
1239 
1240 	if (err < 0) {
1241 		pr_err("Cannot get IRQ\n");
1242 		goto out;
1243 	}
1244 
1245 	lis3->miscdev.minor	= MISC_DYNAMIC_MINOR;
1246 	lis3->miscdev.name	= "freefall";
1247 	lis3->miscdev.fops	= &lis3lv02d_misc_fops;
1248 
1249 	if (misc_register(&lis3->miscdev))
1250 		pr_err("misc_register failed\n");
1251 out:
1252 	return 0;
1253 }
1254 EXPORT_SYMBOL_GPL(lis3lv02d_init_device);
1255 
1256 MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
1257 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
1258 MODULE_LICENSE("GPL");
1259