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 */
param_set_axis(const char * val,const struct kernel_param * kp)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
lis3lv02d_read_8(struct lis3lv02d * lis3,int reg)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
lis3lv02d_read_12(struct lis3lv02d * lis3,int reg)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 */
lis331dlh_read_data(struct lis3lv02d * lis3,int reg)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 */
lis3lv02d_get_axis(s8 axis,int hw_values[3])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 */
lis3lv02d_get_xyz(struct lis3lv02d * lis3,int * x,int * y,int * z)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 */
lis3lv02d_get_odr(struct lis3lv02d * lis3)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
lis3lv02d_get_pwron_wait(struct lis3lv02d * lis3)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
lis3lv02d_set_odr(struct lis3lv02d * lis3,int rate)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
lis3lv02d_selftest(struct lis3lv02d * lis3,s16 results[3])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, ®);
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
lis3_context_save(struct lis3lv02d * lis3)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
lis3_context_restore(struct lis3lv02d * lis3)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
lis3lv02d_poweroff(struct lis3lv02d * lis3)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
lis3lv02d_poweron(struct lis3lv02d * lis3)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, ®);
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 }
434 EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
435
436
lis3lv02d_joystick_poll(struct input_dev * input)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
lis3lv02d_joystick_open(struct input_dev * input)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
lis3lv02d_joystick_close(struct input_dev * input)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
lis302dl_interrupt(int irq,void * data)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
lis302dl_interrupt_handle_click(struct lis3lv02d * lis3)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
lis302dl_data_ready(struct lis3lv02d * lis3,int index)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
lis302dl_interrupt_thread1_8b(int irq,void * data)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
lis302dl_interrupt_thread2_8b(int irq,void * data)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
lis3lv02d_misc_open(struct inode * inode,struct file * file)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
lis3lv02d_misc_release(struct inode * inode,struct file * file)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
lis3lv02d_misc_read(struct file * file,char __user * buf,size_t count,loff_t * pos)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
lis3lv02d_misc_poll(struct file * file,poll_table * wait)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
lis3lv02d_misc_fasync(int fd,struct file * file,int on)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
lis3lv02d_joystick_enable(struct lis3lv02d * lis3)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
lis3lv02d_joystick_disable(struct lis3lv02d * lis3)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 */
lis3lv02d_sysfs_poweron(struct lis3lv02d * lis3)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
lis3lv02d_selftest_show(struct device * dev,struct device_attribute * attr,char * buf)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
lis3lv02d_position_show(struct device * dev,struct device_attribute * attr,char * buf)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
lis3lv02d_rate_show(struct device * dev,struct device_attribute * attr,char * buf)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
lis3lv02d_rate_set(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)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
lis3lv02d_add_fs(struct lis3lv02d * lis3)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
lis3lv02d_remove_fs(struct lis3lv02d * lis3)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
lis3lv02d_8b_configure(struct lis3lv02d * lis3,struct lis3lv02d_platform_data * p)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
lis3lv02d_init_dt(struct lis3lv02d * lis3)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
lis3lv02d_init_dt(struct lis3lv02d * lis3)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 */
lis3lv02d_init_device(struct lis3lv02d * lis3)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
