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.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_index(struct lis3lv02d * lis3)211 static int lis3lv02d_get_odr_index(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 (ctrl >> shift);
220 }
221
lis3lv02d_get_pwron_wait(struct lis3lv02d * lis3)222 static int lis3lv02d_get_pwron_wait(struct lis3lv02d *lis3)
223 {
224 int odr_idx = lis3lv02d_get_odr_index(lis3);
225 int div = lis3->odrs[odr_idx];
226
227 if (div == 0) {
228 if (odr_idx == 0) {
229 /* Power-down mode, not sampling no need to sleep */
230 return 0;
231 }
232
233 dev_err(&lis3->pdev->dev, "Error unknown odrs-index: %d\n", odr_idx);
234 return -ENXIO;
235 }
236
237 /* LIS3 power on delay is quite long */
238 msleep(lis3->pwron_delay / div);
239 return 0;
240 }
241
lis3lv02d_set_odr(struct lis3lv02d * lis3,int rate)242 static int lis3lv02d_set_odr(struct lis3lv02d *lis3, int rate)
243 {
244 u8 ctrl;
245 int i, len, shift;
246
247 if (!rate)
248 return -EINVAL;
249
250 lis3->read(lis3, CTRL_REG1, &ctrl);
251 ctrl &= ~lis3->odr_mask;
252 len = 1 << hweight_long(lis3->odr_mask); /* # of possible values */
253 shift = ffs(lis3->odr_mask) - 1;
254
255 for (i = 0; i < len; i++)
256 if (lis3->odrs[i] == rate) {
257 lis3->write(lis3, CTRL_REG1,
258 ctrl | (i << shift));
259 return 0;
260 }
261 return -EINVAL;
262 }
263
lis3lv02d_selftest(struct lis3lv02d * lis3,s16 results[3])264 static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
265 {
266 u8 ctlreg, reg;
267 s16 x, y, z;
268 u8 selftest;
269 int ret;
270 u8 ctrl_reg_data;
271 unsigned char irq_cfg;
272
273 mutex_lock(&lis3->mutex);
274
275 irq_cfg = lis3->irq_cfg;
276 if (lis3->whoami == WAI_8B) {
277 lis3->data_ready_count[IRQ_LINE0] = 0;
278 lis3->data_ready_count[IRQ_LINE1] = 0;
279
280 /* Change interrupt cfg to data ready for selftest */
281 atomic_inc(&lis3->wake_thread);
282 lis3->irq_cfg = LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY;
283 lis3->read(lis3, CTRL_REG3, &ctrl_reg_data);
284 lis3->write(lis3, CTRL_REG3, (ctrl_reg_data &
285 ~(LIS3_IRQ1_MASK | LIS3_IRQ2_MASK)) |
286 (LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY));
287 }
288
289 if ((lis3->whoami == WAI_3DC) || (lis3->whoami == WAI_3DLH)) {
290 ctlreg = CTRL_REG4;
291 selftest = CTRL4_ST0;
292 } else {
293 ctlreg = CTRL_REG1;
294 if (lis3->whoami == WAI_12B)
295 selftest = CTRL1_ST;
296 else
297 selftest = CTRL1_STP;
298 }
299
300 lis3->read(lis3, ctlreg, ®);
301 lis3->write(lis3, ctlreg, (reg | selftest));
302 ret = lis3lv02d_get_pwron_wait(lis3);
303 if (ret)
304 goto fail;
305
306 /* Read directly to avoid axis remap */
307 x = lis3->read_data(lis3, OUTX);
308 y = lis3->read_data(lis3, OUTY);
309 z = lis3->read_data(lis3, OUTZ);
310
311 /* back to normal settings */
312 lis3->write(lis3, ctlreg, reg);
313 ret = lis3lv02d_get_pwron_wait(lis3);
314 if (ret)
315 goto fail;
316
317 results[0] = x - lis3->read_data(lis3, OUTX);
318 results[1] = y - lis3->read_data(lis3, OUTY);
319 results[2] = z - lis3->read_data(lis3, OUTZ);
320
321 ret = 0;
322
323 if (lis3->whoami == WAI_8B) {
324 /* Restore original interrupt configuration */
325 atomic_dec(&lis3->wake_thread);
326 lis3->write(lis3, CTRL_REG3, ctrl_reg_data);
327 lis3->irq_cfg = irq_cfg;
328
329 if ((irq_cfg & LIS3_IRQ1_MASK) &&
330 lis3->data_ready_count[IRQ_LINE0] < 2) {
331 ret = SELFTEST_IRQ;
332 goto fail;
333 }
334
335 if ((irq_cfg & LIS3_IRQ2_MASK) &&
336 lis3->data_ready_count[IRQ_LINE1] < 2) {
337 ret = SELFTEST_IRQ;
338 goto fail;
339 }
340 }
341
342 if (lis3->pdata) {
343 int i;
344 for (i = 0; i < 3; i++) {
345 /* Check against selftest acceptance limits */
346 if ((results[i] < lis3->pdata->st_min_limits[i]) ||
347 (results[i] > lis3->pdata->st_max_limits[i])) {
348 ret = SELFTEST_FAIL;
349 goto fail;
350 }
351 }
352 }
353
354 /* test passed */
355 fail:
356 mutex_unlock(&lis3->mutex);
357 return ret;
358 }
359
360 /*
361 * Order of registers in the list affects to order of the restore process.
362 * Perhaps it is a good idea to set interrupt enable register as a last one
363 * after all other configurations
364 */
365 static u8 lis3_wai8_regs[] = { FF_WU_CFG_1, FF_WU_THS_1, FF_WU_DURATION_1,
366 FF_WU_CFG_2, FF_WU_THS_2, FF_WU_DURATION_2,
367 CLICK_CFG, CLICK_SRC, CLICK_THSY_X, CLICK_THSZ,
368 CLICK_TIMELIMIT, CLICK_LATENCY, CLICK_WINDOW,
369 CTRL_REG1, CTRL_REG2, CTRL_REG3};
370
371 static u8 lis3_wai12_regs[] = {FF_WU_CFG, FF_WU_THS_L, FF_WU_THS_H,
372 FF_WU_DURATION, DD_CFG, DD_THSI_L, DD_THSI_H,
373 DD_THSE_L, DD_THSE_H,
374 CTRL_REG1, CTRL_REG3, CTRL_REG2};
375
lis3_context_save(struct lis3lv02d * lis3)376 static inline void lis3_context_save(struct lis3lv02d *lis3)
377 {
378 int i;
379 for (i = 0; i < lis3->regs_size; i++)
380 lis3->read(lis3, lis3->regs[i], &lis3->reg_cache[i]);
381 lis3->regs_stored = true;
382 }
383
lis3_context_restore(struct lis3lv02d * lis3)384 static inline void lis3_context_restore(struct lis3lv02d *lis3)
385 {
386 int i;
387 if (lis3->regs_stored)
388 for (i = 0; i < lis3->regs_size; i++)
389 lis3->write(lis3, lis3->regs[i], lis3->reg_cache[i]);
390 }
391
lis3lv02d_poweroff(struct lis3lv02d * lis3)392 void lis3lv02d_poweroff(struct lis3lv02d *lis3)
393 {
394 if (lis3->reg_ctrl)
395 lis3_context_save(lis3);
396 /* disable X,Y,Z axis and power down */
397 lis3->write(lis3, CTRL_REG1, 0x00);
398 if (lis3->reg_ctrl)
399 lis3->reg_ctrl(lis3, LIS3_REG_OFF);
400 }
401 EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);
402
lis3lv02d_poweron(struct lis3lv02d * lis3)403 int lis3lv02d_poweron(struct lis3lv02d *lis3)
404 {
405 int err;
406 u8 reg;
407
408 lis3->init(lis3);
409
410 /*
411 * Common configuration
412 * BDU: (12 bits sensors only) LSB and MSB values are not updated until
413 * both have been read. So the value read will always be correct.
414 * Set BOOT bit to refresh factory tuning values.
415 */
416 if (lis3->pdata) {
417 lis3->read(lis3, CTRL_REG2, ®);
418 if (lis3->whoami == WAI_12B)
419 reg |= CTRL2_BDU | CTRL2_BOOT;
420 else if (lis3->whoami == WAI_3DLH)
421 reg |= CTRL2_BOOT_3DLH;
422 else
423 reg |= CTRL2_BOOT_8B;
424 lis3->write(lis3, CTRL_REG2, reg);
425
426 if (lis3->whoami == WAI_3DLH) {
427 lis3->read(lis3, CTRL_REG4, ®);
428 reg |= CTRL4_BDU;
429 lis3->write(lis3, CTRL_REG4, reg);
430 }
431 }
432
433 err = lis3lv02d_get_pwron_wait(lis3);
434 if (err)
435 return err;
436
437 if (lis3->reg_ctrl)
438 lis3_context_restore(lis3);
439
440 return 0;
441 }
442 EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
443
444
lis3lv02d_joystick_poll(struct input_dev * input)445 static void lis3lv02d_joystick_poll(struct input_dev *input)
446 {
447 struct lis3lv02d *lis3 = input_get_drvdata(input);
448 int x, y, z;
449
450 mutex_lock(&lis3->mutex);
451 lis3lv02d_get_xyz(lis3, &x, &y, &z);
452 input_report_abs(input, ABS_X, x);
453 input_report_abs(input, ABS_Y, y);
454 input_report_abs(input, ABS_Z, z);
455 input_sync(input);
456 mutex_unlock(&lis3->mutex);
457 }
458
lis3lv02d_joystick_open(struct input_dev * input)459 static int lis3lv02d_joystick_open(struct input_dev *input)
460 {
461 struct lis3lv02d *lis3 = input_get_drvdata(input);
462
463 if (lis3->pm_dev)
464 pm_runtime_get_sync(lis3->pm_dev);
465
466 if (lis3->pdata && lis3->whoami == WAI_8B && lis3->idev)
467 atomic_set(&lis3->wake_thread, 1);
468 /*
469 * Update coordinates for the case where poll interval is 0 and
470 * the chip in running purely under interrupt control
471 */
472 lis3lv02d_joystick_poll(input);
473
474 return 0;
475 }
476
lis3lv02d_joystick_close(struct input_dev * input)477 static void lis3lv02d_joystick_close(struct input_dev *input)
478 {
479 struct lis3lv02d *lis3 = input_get_drvdata(input);
480
481 atomic_set(&lis3->wake_thread, 0);
482 if (lis3->pm_dev)
483 pm_runtime_put(lis3->pm_dev);
484 }
485
lis302dl_interrupt(int irq,void * data)486 static irqreturn_t lis302dl_interrupt(int irq, void *data)
487 {
488 struct lis3lv02d *lis3 = data;
489
490 if (!test_bit(0, &lis3->misc_opened))
491 goto out;
492
493 /*
494 * Be careful: on some HP laptops the bios force DD when on battery and
495 * the lid is closed. This leads to interrupts as soon as a little move
496 * is done.
497 */
498 atomic_inc(&lis3->count);
499
500 wake_up_interruptible(&lis3->misc_wait);
501 kill_fasync(&lis3->async_queue, SIGIO, POLL_IN);
502 out:
503 if (atomic_read(&lis3->wake_thread))
504 return IRQ_WAKE_THREAD;
505 return IRQ_HANDLED;
506 }
507
lis302dl_interrupt_handle_click(struct lis3lv02d * lis3)508 static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3)
509 {
510 struct input_dev *dev = lis3->idev;
511 u8 click_src;
512
513 mutex_lock(&lis3->mutex);
514 lis3->read(lis3, CLICK_SRC, &click_src);
515
516 if (click_src & CLICK_SINGLE_X) {
517 input_report_key(dev, lis3->mapped_btns[0], 1);
518 input_report_key(dev, lis3->mapped_btns[0], 0);
519 }
520
521 if (click_src & CLICK_SINGLE_Y) {
522 input_report_key(dev, lis3->mapped_btns[1], 1);
523 input_report_key(dev, lis3->mapped_btns[1], 0);
524 }
525
526 if (click_src & CLICK_SINGLE_Z) {
527 input_report_key(dev, lis3->mapped_btns[2], 1);
528 input_report_key(dev, lis3->mapped_btns[2], 0);
529 }
530 input_sync(dev);
531 mutex_unlock(&lis3->mutex);
532 }
533
lis302dl_data_ready(struct lis3lv02d * lis3,int index)534 static inline void lis302dl_data_ready(struct lis3lv02d *lis3, int index)
535 {
536 int dummy;
537
538 /* Dummy read to ack interrupt */
539 lis3lv02d_get_xyz(lis3, &dummy, &dummy, &dummy);
540 lis3->data_ready_count[index]++;
541 }
542
lis302dl_interrupt_thread1_8b(int irq,void * data)543 static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data)
544 {
545 struct lis3lv02d *lis3 = data;
546 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ1_MASK;
547
548 if (irq_cfg == LIS3_IRQ1_CLICK)
549 lis302dl_interrupt_handle_click(lis3);
550 else if (unlikely(irq_cfg == LIS3_IRQ1_DATA_READY))
551 lis302dl_data_ready(lis3, IRQ_LINE0);
552 else
553 lis3lv02d_joystick_poll(lis3->idev);
554
555 return IRQ_HANDLED;
556 }
557
lis302dl_interrupt_thread2_8b(int irq,void * data)558 static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data)
559 {
560 struct lis3lv02d *lis3 = data;
561 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ2_MASK;
562
563 if (irq_cfg == LIS3_IRQ2_CLICK)
564 lis302dl_interrupt_handle_click(lis3);
565 else if (unlikely(irq_cfg == LIS3_IRQ2_DATA_READY))
566 lis302dl_data_ready(lis3, IRQ_LINE1);
567 else
568 lis3lv02d_joystick_poll(lis3->idev);
569
570 return IRQ_HANDLED;
571 }
572
lis3lv02d_misc_open(struct inode * inode,struct file * file)573 static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
574 {
575 struct lis3lv02d *lis3 = container_of(file->private_data,
576 struct lis3lv02d, miscdev);
577
578 if (test_and_set_bit(0, &lis3->misc_opened))
579 return -EBUSY; /* already open */
580
581 if (lis3->pm_dev)
582 pm_runtime_get_sync(lis3->pm_dev);
583
584 atomic_set(&lis3->count, 0);
585 return 0;
586 }
587
lis3lv02d_misc_release(struct inode * inode,struct file * file)588 static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
589 {
590 struct lis3lv02d *lis3 = container_of(file->private_data,
591 struct lis3lv02d, miscdev);
592
593 clear_bit(0, &lis3->misc_opened); /* release the device */
594 if (lis3->pm_dev)
595 pm_runtime_put(lis3->pm_dev);
596 return 0;
597 }
598
lis3lv02d_misc_read(struct file * file,char __user * buf,size_t count,loff_t * pos)599 static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf,
600 size_t count, loff_t *pos)
601 {
602 struct lis3lv02d *lis3 = container_of(file->private_data,
603 struct lis3lv02d, miscdev);
604
605 DECLARE_WAITQUEUE(wait, current);
606 u32 data;
607 unsigned char byte_data;
608 ssize_t retval = 1;
609
610 if (count < 1)
611 return -EINVAL;
612
613 add_wait_queue(&lis3->misc_wait, &wait);
614 while (true) {
615 set_current_state(TASK_INTERRUPTIBLE);
616 data = atomic_xchg(&lis3->count, 0);
617 if (data)
618 break;
619
620 if (file->f_flags & O_NONBLOCK) {
621 retval = -EAGAIN;
622 goto out;
623 }
624
625 if (signal_pending(current)) {
626 retval = -ERESTARTSYS;
627 goto out;
628 }
629
630 schedule();
631 }
632
633 if (data < 255)
634 byte_data = data;
635 else
636 byte_data = 255;
637
638 /* make sure we are not going into copy_to_user() with
639 * TASK_INTERRUPTIBLE state */
640 set_current_state(TASK_RUNNING);
641 if (copy_to_user(buf, &byte_data, sizeof(byte_data)))
642 retval = -EFAULT;
643
644 out:
645 __set_current_state(TASK_RUNNING);
646 remove_wait_queue(&lis3->misc_wait, &wait);
647
648 return retval;
649 }
650
lis3lv02d_misc_poll(struct file * file,poll_table * wait)651 static __poll_t lis3lv02d_misc_poll(struct file *file, poll_table *wait)
652 {
653 struct lis3lv02d *lis3 = container_of(file->private_data,
654 struct lis3lv02d, miscdev);
655
656 poll_wait(file, &lis3->misc_wait, wait);
657 if (atomic_read(&lis3->count))
658 return EPOLLIN | EPOLLRDNORM;
659 return 0;
660 }
661
lis3lv02d_misc_fasync(int fd,struct file * file,int on)662 static int lis3lv02d_misc_fasync(int fd, struct file *file, int on)
663 {
664 struct lis3lv02d *lis3 = container_of(file->private_data,
665 struct lis3lv02d, miscdev);
666
667 return fasync_helper(fd, file, on, &lis3->async_queue);
668 }
669
670 static const struct file_operations lis3lv02d_misc_fops = {
671 .owner = THIS_MODULE,
672 .llseek = no_llseek,
673 .read = lis3lv02d_misc_read,
674 .open = lis3lv02d_misc_open,
675 .release = lis3lv02d_misc_release,
676 .poll = lis3lv02d_misc_poll,
677 .fasync = lis3lv02d_misc_fasync,
678 };
679
lis3lv02d_joystick_enable(struct lis3lv02d * lis3)680 int lis3lv02d_joystick_enable(struct lis3lv02d *lis3)
681 {
682 struct input_dev *input_dev;
683 int err;
684 int max_val, fuzz, flat;
685 int btns[] = {BTN_X, BTN_Y, BTN_Z};
686
687 if (lis3->idev)
688 return -EINVAL;
689
690 input_dev = input_allocate_device();
691 if (!input_dev)
692 return -ENOMEM;
693
694 input_dev->name = "ST LIS3LV02DL Accelerometer";
695 input_dev->phys = DRIVER_NAME "/input0";
696 input_dev->id.bustype = BUS_HOST;
697 input_dev->id.vendor = 0;
698 input_dev->dev.parent = &lis3->pdev->dev;
699
700 input_dev->open = lis3lv02d_joystick_open;
701 input_dev->close = lis3lv02d_joystick_close;
702
703 max_val = (lis3->mdps_max_val * lis3->scale) / LIS3_ACCURACY;
704 if (lis3->whoami == WAI_12B) {
705 fuzz = LIS3_DEFAULT_FUZZ_12B;
706 flat = LIS3_DEFAULT_FLAT_12B;
707 } else {
708 fuzz = LIS3_DEFAULT_FUZZ_8B;
709 flat = LIS3_DEFAULT_FLAT_8B;
710 }
711 fuzz = (fuzz * lis3->scale) / LIS3_ACCURACY;
712 flat = (flat * lis3->scale) / LIS3_ACCURACY;
713
714 input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat);
715 input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat);
716 input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat);
717
718 input_set_drvdata(input_dev, lis3);
719 lis3->idev = input_dev;
720
721 err = input_setup_polling(input_dev, lis3lv02d_joystick_poll);
722 if (err)
723 goto err_free_input;
724
725 input_set_poll_interval(input_dev, MDPS_POLL_INTERVAL);
726 input_set_min_poll_interval(input_dev, MDPS_POLL_MIN);
727 input_set_max_poll_interval(input_dev, MDPS_POLL_MAX);
728
729 lis3->mapped_btns[0] = lis3lv02d_get_axis(abs(lis3->ac.x), btns);
730 lis3->mapped_btns[1] = lis3lv02d_get_axis(abs(lis3->ac.y), btns);
731 lis3->mapped_btns[2] = lis3lv02d_get_axis(abs(lis3->ac.z), btns);
732
733 err = input_register_device(lis3->idev);
734 if (err)
735 goto err_free_input;
736
737 return 0;
738
739 err_free_input:
740 input_free_device(input_dev);
741 lis3->idev = NULL;
742 return err;
743
744 }
745 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
746
lis3lv02d_joystick_disable(struct lis3lv02d * lis3)747 void lis3lv02d_joystick_disable(struct lis3lv02d *lis3)
748 {
749 if (lis3->irq)
750 free_irq(lis3->irq, lis3);
751 if (lis3->pdata && lis3->pdata->irq2)
752 free_irq(lis3->pdata->irq2, lis3);
753
754 if (!lis3->idev)
755 return;
756
757 if (lis3->irq)
758 misc_deregister(&lis3->miscdev);
759 input_unregister_device(lis3->idev);
760 lis3->idev = NULL;
761 }
762 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
763
764 /* Sysfs stuff */
lis3lv02d_sysfs_poweron(struct lis3lv02d * lis3)765 static void lis3lv02d_sysfs_poweron(struct lis3lv02d *lis3)
766 {
767 /*
768 * SYSFS functions are fast visitors so put-call
769 * immediately after the get-call. However, keep
770 * chip running for a while and schedule delayed
771 * suspend. This way periodic sysfs calls doesn't
772 * suffer from relatively long power up time.
773 */
774
775 if (lis3->pm_dev) {
776 pm_runtime_get_sync(lis3->pm_dev);
777 pm_runtime_put_noidle(lis3->pm_dev);
778 pm_schedule_suspend(lis3->pm_dev, LIS3_SYSFS_POWERDOWN_DELAY);
779 }
780 }
781
lis3lv02d_selftest_show(struct device * dev,struct device_attribute * attr,char * buf)782 static ssize_t lis3lv02d_selftest_show(struct device *dev,
783 struct device_attribute *attr, char *buf)
784 {
785 struct lis3lv02d *lis3 = dev_get_drvdata(dev);
786 s16 values[3];
787
788 static const char ok[] = "OK";
789 static const char fail[] = "FAIL";
790 static const char irq[] = "FAIL_IRQ";
791 const char *res;
792
793 lis3lv02d_sysfs_poweron(lis3);
794 switch (lis3lv02d_selftest(lis3, values)) {
795 case SELFTEST_FAIL:
796 res = fail;
797 break;
798 case SELFTEST_IRQ:
799 res = irq;
800 break;
801 case SELFTEST_OK:
802 default:
803 res = ok;
804 break;
805 }
806 return sprintf(buf, "%s %d %d %d\n", res,
807 values[0], values[1], values[2]);
808 }
809
lis3lv02d_position_show(struct device * dev,struct device_attribute * attr,char * buf)810 static ssize_t lis3lv02d_position_show(struct device *dev,
811 struct device_attribute *attr, char *buf)
812 {
813 struct lis3lv02d *lis3 = dev_get_drvdata(dev);
814 int x, y, z;
815
816 lis3lv02d_sysfs_poweron(lis3);
817 mutex_lock(&lis3->mutex);
818 lis3lv02d_get_xyz(lis3, &x, &y, &z);
819 mutex_unlock(&lis3->mutex);
820 return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
821 }
822
lis3lv02d_rate_show(struct device * dev,struct device_attribute * attr,char * buf)823 static ssize_t lis3lv02d_rate_show(struct device *dev,
824 struct device_attribute *attr, char *buf)
825 {
826 struct lis3lv02d *lis3 = dev_get_drvdata(dev);
827 int odr_idx;
828
829 lis3lv02d_sysfs_poweron(lis3);
830
831 odr_idx = lis3lv02d_get_odr_index(lis3);
832 return sprintf(buf, "%d\n", lis3->odrs[odr_idx]);
833 }
834
lis3lv02d_rate_set(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)835 static ssize_t lis3lv02d_rate_set(struct device *dev,
836 struct device_attribute *attr, const char *buf,
837 size_t count)
838 {
839 struct lis3lv02d *lis3 = dev_get_drvdata(dev);
840 unsigned long rate;
841 int ret;
842
843 ret = kstrtoul(buf, 0, &rate);
844 if (ret)
845 return ret;
846
847 lis3lv02d_sysfs_poweron(lis3);
848 if (lis3lv02d_set_odr(lis3, rate))
849 return -EINVAL;
850
851 return count;
852 }
853
854 static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL);
855 static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
856 static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show,
857 lis3lv02d_rate_set);
858
859 static struct attribute *lis3lv02d_attributes[] = {
860 &dev_attr_selftest.attr,
861 &dev_attr_position.attr,
862 &dev_attr_rate.attr,
863 NULL
864 };
865
866 static const struct attribute_group lis3lv02d_attribute_group = {
867 .attrs = lis3lv02d_attributes
868 };
869
870
lis3lv02d_add_fs(struct lis3lv02d * lis3)871 static int lis3lv02d_add_fs(struct lis3lv02d *lis3)
872 {
873 lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
874 if (IS_ERR(lis3->pdev))
875 return PTR_ERR(lis3->pdev);
876
877 platform_set_drvdata(lis3->pdev, lis3);
878 return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
879 }
880
lis3lv02d_remove_fs(struct lis3lv02d * lis3)881 void lis3lv02d_remove_fs(struct lis3lv02d *lis3)
882 {
883 sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
884 platform_device_unregister(lis3->pdev);
885 if (lis3->pm_dev) {
886 /* Barrier after the sysfs remove */
887 pm_runtime_barrier(lis3->pm_dev);
888
889 /* SYSFS may have left chip running. Turn off if necessary */
890 if (!pm_runtime_suspended(lis3->pm_dev))
891 lis3lv02d_poweroff(lis3);
892
893 pm_runtime_disable(lis3->pm_dev);
894 pm_runtime_set_suspended(lis3->pm_dev);
895 }
896 kfree(lis3->reg_cache);
897 }
898 EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
899
lis3lv02d_8b_configure(struct lis3lv02d * lis3,struct lis3lv02d_platform_data * p)900 static void lis3lv02d_8b_configure(struct lis3lv02d *lis3,
901 struct lis3lv02d_platform_data *p)
902 {
903 int err;
904 int ctrl2 = p->hipass_ctrl;
905
906 if (p->click_flags) {
907 lis3->write(lis3, CLICK_CFG, p->click_flags);
908 lis3->write(lis3, CLICK_TIMELIMIT, p->click_time_limit);
909 lis3->write(lis3, CLICK_LATENCY, p->click_latency);
910 lis3->write(lis3, CLICK_WINDOW, p->click_window);
911 lis3->write(lis3, CLICK_THSZ, p->click_thresh_z & 0xf);
912 lis3->write(lis3, CLICK_THSY_X,
913 (p->click_thresh_x & 0xf) |
914 (p->click_thresh_y << 4));
915
916 if (lis3->idev) {
917 input_set_capability(lis3->idev, EV_KEY, BTN_X);
918 input_set_capability(lis3->idev, EV_KEY, BTN_Y);
919 input_set_capability(lis3->idev, EV_KEY, BTN_Z);
920 }
921 }
922
923 if (p->wakeup_flags) {
924 lis3->write(lis3, FF_WU_CFG_1, p->wakeup_flags);
925 lis3->write(lis3, FF_WU_THS_1, p->wakeup_thresh & 0x7f);
926 /* pdata value + 1 to keep this backward compatible*/
927 lis3->write(lis3, FF_WU_DURATION_1, p->duration1 + 1);
928 ctrl2 ^= HP_FF_WU1; /* Xor to keep compatible with old pdata*/
929 }
930
931 if (p->wakeup_flags2) {
932 lis3->write(lis3, FF_WU_CFG_2, p->wakeup_flags2);
933 lis3->write(lis3, FF_WU_THS_2, p->wakeup_thresh2 & 0x7f);
934 /* pdata value + 1 to keep this backward compatible*/
935 lis3->write(lis3, FF_WU_DURATION_2, p->duration2 + 1);
936 ctrl2 ^= HP_FF_WU2; /* Xor to keep compatible with old pdata*/
937 }
938 /* Configure hipass filters */
939 lis3->write(lis3, CTRL_REG2, ctrl2);
940
941 if (p->irq2) {
942 err = request_threaded_irq(p->irq2,
943 NULL,
944 lis302dl_interrupt_thread2_8b,
945 IRQF_TRIGGER_RISING | IRQF_ONESHOT |
946 (p->irq_flags2 & IRQF_TRIGGER_MASK),
947 DRIVER_NAME, lis3);
948 if (err < 0)
949 pr_err("No second IRQ. Limited functionality\n");
950 }
951 }
952
953 #ifdef CONFIG_OF
lis3lv02d_init_dt(struct lis3lv02d * lis3)954 int lis3lv02d_init_dt(struct lis3lv02d *lis3)
955 {
956 struct lis3lv02d_platform_data *pdata;
957 struct device_node *np = lis3->of_node;
958 u32 val;
959 s32 sval;
960
961 if (!lis3->of_node)
962 return 0;
963
964 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
965 if (!pdata)
966 return -ENOMEM;
967
968 if (of_property_read_bool(np, "st,click-single-x"))
969 pdata->click_flags |= LIS3_CLICK_SINGLE_X;
970 if (of_property_read_bool(np, "st,click-double-x"))
971 pdata->click_flags |= LIS3_CLICK_DOUBLE_X;
972
973 if (of_property_read_bool(np, "st,click-single-y"))
974 pdata->click_flags |= LIS3_CLICK_SINGLE_Y;
975 if (of_property_read_bool(np, "st,click-double-y"))
976 pdata->click_flags |= LIS3_CLICK_DOUBLE_Y;
977
978 if (of_property_read_bool(np, "st,click-single-z"))
979 pdata->click_flags |= LIS3_CLICK_SINGLE_Z;
980 if (of_property_read_bool(np, "st,click-double-z"))
981 pdata->click_flags |= LIS3_CLICK_DOUBLE_Z;
982
983 if (!of_property_read_u32(np, "st,click-threshold-x", &val))
984 pdata->click_thresh_x = val;
985 if (!of_property_read_u32(np, "st,click-threshold-y", &val))
986 pdata->click_thresh_y = val;
987 if (!of_property_read_u32(np, "st,click-threshold-z", &val))
988 pdata->click_thresh_z = val;
989
990 if (!of_property_read_u32(np, "st,click-time-limit", &val))
991 pdata->click_time_limit = val;
992 if (!of_property_read_u32(np, "st,click-latency", &val))
993 pdata->click_latency = val;
994 if (!of_property_read_u32(np, "st,click-window", &val))
995 pdata->click_window = val;
996
997 if (of_property_read_bool(np, "st,irq1-disable"))
998 pdata->irq_cfg |= LIS3_IRQ1_DISABLE;
999 if (of_property_read_bool(np, "st,irq1-ff-wu-1"))
1000 pdata->irq_cfg |= LIS3_IRQ1_FF_WU_1;
1001 if (of_property_read_bool(np, "st,irq1-ff-wu-2"))
1002 pdata->irq_cfg |= LIS3_IRQ1_FF_WU_2;
1003 if (of_property_read_bool(np, "st,irq1-data-ready"))
1004 pdata->irq_cfg |= LIS3_IRQ1_DATA_READY;
1005 if (of_property_read_bool(np, "st,irq1-click"))
1006 pdata->irq_cfg |= LIS3_IRQ1_CLICK;
1007
1008 if (of_property_read_bool(np, "st,irq2-disable"))
1009 pdata->irq_cfg |= LIS3_IRQ2_DISABLE;
1010 if (of_property_read_bool(np, "st,irq2-ff-wu-1"))
1011 pdata->irq_cfg |= LIS3_IRQ2_FF_WU_1;
1012 if (of_property_read_bool(np, "st,irq2-ff-wu-2"))
1013 pdata->irq_cfg |= LIS3_IRQ2_FF_WU_2;
1014 if (of_property_read_bool(np, "st,irq2-data-ready"))
1015 pdata->irq_cfg |= LIS3_IRQ2_DATA_READY;
1016 if (of_property_read_bool(np, "st,irq2-click"))
1017 pdata->irq_cfg |= LIS3_IRQ2_CLICK;
1018
1019 if (of_property_read_bool(np, "st,irq-open-drain"))
1020 pdata->irq_cfg |= LIS3_IRQ_OPEN_DRAIN;
1021 if (of_property_read_bool(np, "st,irq-active-low"))
1022 pdata->irq_cfg |= LIS3_IRQ_ACTIVE_LOW;
1023
1024 if (!of_property_read_u32(np, "st,wu-duration-1", &val))
1025 pdata->duration1 = val;
1026 if (!of_property_read_u32(np, "st,wu-duration-2", &val))
1027 pdata->duration2 = val;
1028
1029 if (of_property_read_bool(np, "st,wakeup-x-lo"))
1030 pdata->wakeup_flags |= LIS3_WAKEUP_X_LO;
1031 if (of_property_read_bool(np, "st,wakeup-x-hi"))
1032 pdata->wakeup_flags |= LIS3_WAKEUP_X_HI;
1033 if (of_property_read_bool(np, "st,wakeup-y-lo"))
1034 pdata->wakeup_flags |= LIS3_WAKEUP_Y_LO;
1035 if (of_property_read_bool(np, "st,wakeup-y-hi"))
1036 pdata->wakeup_flags |= LIS3_WAKEUP_Y_HI;
1037 if (of_property_read_bool(np, "st,wakeup-z-lo"))
1038 pdata->wakeup_flags |= LIS3_WAKEUP_Z_LO;
1039 if (of_property_read_bool(np, "st,wakeup-z-hi"))
1040 pdata->wakeup_flags |= LIS3_WAKEUP_Z_HI;
1041 if (of_get_property(np, "st,wakeup-threshold", &val))
1042 pdata->wakeup_thresh = val;
1043
1044 if (of_property_read_bool(np, "st,wakeup2-x-lo"))
1045 pdata->wakeup_flags2 |= LIS3_WAKEUP_X_LO;
1046 if (of_property_read_bool(np, "st,wakeup2-x-hi"))
1047 pdata->wakeup_flags2 |= LIS3_WAKEUP_X_HI;
1048 if (of_property_read_bool(np, "st,wakeup2-y-lo"))
1049 pdata->wakeup_flags2 |= LIS3_WAKEUP_Y_LO;
1050 if (of_property_read_bool(np, "st,wakeup2-y-hi"))
1051 pdata->wakeup_flags2 |= LIS3_WAKEUP_Y_HI;
1052 if (of_property_read_bool(np, "st,wakeup2-z-lo"))
1053 pdata->wakeup_flags2 |= LIS3_WAKEUP_Z_LO;
1054 if (of_property_read_bool(np, "st,wakeup2-z-hi"))
1055 pdata->wakeup_flags2 |= LIS3_WAKEUP_Z_HI;
1056 if (of_get_property(np, "st,wakeup2-threshold", &val))
1057 pdata->wakeup_thresh2 = val;
1058
1059 if (!of_property_read_u32(np, "st,highpass-cutoff-hz", &val)) {
1060 switch (val) {
1061 case 1:
1062 pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_1HZ;
1063 break;
1064 case 2:
1065 pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_2HZ;
1066 break;
1067 case 4:
1068 pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_4HZ;
1069 break;
1070 case 8:
1071 pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_8HZ;
1072 break;
1073 }
1074 }
1075
1076 if (of_property_read_bool(np, "st,hipass1-disable"))
1077 pdata->hipass_ctrl |= LIS3_HIPASS1_DISABLE;
1078 if (of_property_read_bool(np, "st,hipass2-disable"))
1079 pdata->hipass_ctrl |= LIS3_HIPASS2_DISABLE;
1080
1081 if (of_property_read_s32(np, "st,axis-x", &sval) == 0)
1082 pdata->axis_x = sval;
1083 if (of_property_read_s32(np, "st,axis-y", &sval) == 0)
1084 pdata->axis_y = sval;
1085 if (of_property_read_s32(np, "st,axis-z", &sval) == 0)
1086 pdata->axis_z = sval;
1087
1088 if (of_property_read_u32(np, "st,default-rate", &val) == 0)
1089 pdata->default_rate = val;
1090
1091 if (of_property_read_s32(np, "st,min-limit-x", &sval) == 0)
1092 pdata->st_min_limits[0] = sval;
1093 if (of_property_read_s32(np, "st,min-limit-y", &sval) == 0)
1094 pdata->st_min_limits[1] = sval;
1095 if (of_property_read_s32(np, "st,min-limit-z", &sval) == 0)
1096 pdata->st_min_limits[2] = sval;
1097
1098 if (of_property_read_s32(np, "st,max-limit-x", &sval) == 0)
1099 pdata->st_max_limits[0] = sval;
1100 if (of_property_read_s32(np, "st,max-limit-y", &sval) == 0)
1101 pdata->st_max_limits[1] = sval;
1102 if (of_property_read_s32(np, "st,max-limit-z", &sval) == 0)
1103 pdata->st_max_limits[2] = sval;
1104
1105
1106 lis3->pdata = pdata;
1107
1108 return 0;
1109 }
1110
1111 #else
lis3lv02d_init_dt(struct lis3lv02d * lis3)1112 int lis3lv02d_init_dt(struct lis3lv02d *lis3)
1113 {
1114 return 0;
1115 }
1116 #endif
1117 EXPORT_SYMBOL_GPL(lis3lv02d_init_dt);
1118
1119 /*
1120 * Initialise the accelerometer and the various subsystems.
1121 * Should be rather independent of the bus system.
1122 */
lis3lv02d_init_device(struct lis3lv02d * lis3)1123 int lis3lv02d_init_device(struct lis3lv02d *lis3)
1124 {
1125 int err;
1126 irq_handler_t thread_fn;
1127 int irq_flags = 0;
1128
1129 lis3->whoami = lis3lv02d_read_8(lis3, WHO_AM_I);
1130
1131 switch (lis3->whoami) {
1132 case WAI_12B:
1133 pr_info("12 bits sensor found\n");
1134 lis3->read_data = lis3lv02d_read_12;
1135 lis3->mdps_max_val = 2048;
1136 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_12B;
1137 lis3->odrs = lis3_12_rates;
1138 lis3->odr_mask = CTRL1_DF0 | CTRL1_DF1;
1139 lis3->scale = LIS3_SENSITIVITY_12B;
1140 lis3->regs = lis3_wai12_regs;
1141 lis3->regs_size = ARRAY_SIZE(lis3_wai12_regs);
1142 break;
1143 case WAI_8B:
1144 pr_info("8 bits sensor found\n");
1145 lis3->read_data = lis3lv02d_read_8;
1146 lis3->mdps_max_val = 128;
1147 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
1148 lis3->odrs = lis3_8_rates;
1149 lis3->odr_mask = CTRL1_DR;
1150 lis3->scale = LIS3_SENSITIVITY_8B;
1151 lis3->regs = lis3_wai8_regs;
1152 lis3->regs_size = ARRAY_SIZE(lis3_wai8_regs);
1153 break;
1154 case WAI_3DC:
1155 pr_info("8 bits 3DC sensor found\n");
1156 lis3->read_data = lis3lv02d_read_8;
1157 lis3->mdps_max_val = 128;
1158 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
1159 lis3->odrs = lis3_3dc_rates;
1160 lis3->odr_mask = CTRL1_ODR0|CTRL1_ODR1|CTRL1_ODR2|CTRL1_ODR3;
1161 lis3->scale = LIS3_SENSITIVITY_8B;
1162 break;
1163 case WAI_3DLH:
1164 pr_info("16 bits lis331dlh sensor found\n");
1165 lis3->read_data = lis331dlh_read_data;
1166 lis3->mdps_max_val = 2048; /* 12 bits for 2G */
1167 lis3->shift_adj = SHIFT_ADJ_2G;
1168 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
1169 lis3->odrs = lis3_3dlh_rates;
1170 lis3->odr_mask = CTRL1_DR0 | CTRL1_DR1;
1171 lis3->scale = LIS3DLH_SENSITIVITY_2G;
1172 break;
1173 default:
1174 pr_err("unknown sensor type 0x%X\n", lis3->whoami);
1175 return -ENODEV;
1176 }
1177
1178 lis3->reg_cache = kzalloc(max(sizeof(lis3_wai8_regs),
1179 sizeof(lis3_wai12_regs)), GFP_KERNEL);
1180
1181 if (lis3->reg_cache == NULL)
1182 return -ENOMEM;
1183
1184 mutex_init(&lis3->mutex);
1185 atomic_set(&lis3->wake_thread, 0);
1186
1187 lis3lv02d_add_fs(lis3);
1188 err = lis3lv02d_poweron(lis3);
1189 if (err) {
1190 lis3lv02d_remove_fs(lis3);
1191 return err;
1192 }
1193
1194 if (lis3->pm_dev) {
1195 pm_runtime_set_active(lis3->pm_dev);
1196 pm_runtime_enable(lis3->pm_dev);
1197 }
1198
1199 if (lis3lv02d_joystick_enable(lis3))
1200 pr_err("joystick initialization failed\n");
1201
1202 /* passing in platform specific data is purely optional and only
1203 * used by the SPI transport layer at the moment */
1204 if (lis3->pdata) {
1205 struct lis3lv02d_platform_data *p = lis3->pdata;
1206
1207 if (lis3->whoami == WAI_8B)
1208 lis3lv02d_8b_configure(lis3, p);
1209
1210 irq_flags = p->irq_flags1 & IRQF_TRIGGER_MASK;
1211
1212 lis3->irq_cfg = p->irq_cfg;
1213 if (p->irq_cfg)
1214 lis3->write(lis3, CTRL_REG3, p->irq_cfg);
1215
1216 if (p->default_rate)
1217 lis3lv02d_set_odr(lis3, p->default_rate);
1218 }
1219
1220 /* bail if we did not get an IRQ from the bus layer */
1221 if (!lis3->irq) {
1222 pr_debug("No IRQ. Disabling /dev/freefall\n");
1223 goto out;
1224 }
1225
1226 /*
1227 * The sensor can generate interrupts for free-fall and direction
1228 * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep
1229 * the things simple and _fast_ we activate it only for free-fall, so
1230 * no need to read register (very slow with ACPI). For the same reason,
1231 * we forbid shared interrupts.
1232 *
1233 * IRQF_TRIGGER_RISING seems pointless on HP laptops because the
1234 * io-apic is not configurable (and generates a warning) but I keep it
1235 * in case of support for other hardware.
1236 */
1237 if (lis3->pdata && lis3->whoami == WAI_8B)
1238 thread_fn = lis302dl_interrupt_thread1_8b;
1239 else
1240 thread_fn = NULL;
1241
1242 err = request_threaded_irq(lis3->irq, lis302dl_interrupt,
1243 thread_fn,
1244 IRQF_TRIGGER_RISING | IRQF_ONESHOT |
1245 irq_flags,
1246 DRIVER_NAME, lis3);
1247
1248 if (err < 0) {
1249 pr_err("Cannot get IRQ\n");
1250 goto out;
1251 }
1252
1253 lis3->miscdev.minor = MISC_DYNAMIC_MINOR;
1254 lis3->miscdev.name = "freefall";
1255 lis3->miscdev.fops = &lis3lv02d_misc_fops;
1256
1257 if (misc_register(&lis3->miscdev))
1258 pr_err("misc_register failed\n");
1259 out:
1260 return 0;
1261 }
1262 EXPORT_SYMBOL_GPL(lis3lv02d_init_device);
1263
1264 MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
1265 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
1266 MODULE_LICENSE("GPL");
1267