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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / drivers / misc / lis3lv02d / lis3lv02d.c
blob8b51cd62d067d3e5f614c65e7437d31bd6df90f8
1 /*
2 * lis3lv02d.c - ST LIS3LV02DL accelerometer driver
3 *
4 * Copyright (C) 2007-2008 Yan Burman
5 * Copyright (C) 2008 Eric Piel
6 * Copyright (C) 2008-2009 Pavel Machek
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
25 #include <linux/kernel.h>
26 #include <linux/init.h>
27 #include <linux/dmi.h>
28 #include <linux/module.h>
29 #include <linux/types.h>
30 #include <linux/platform_device.h>
31 #include <linux/interrupt.h>
32 #include <linux/input-polldev.h>
33 #include <linux/delay.h>
34 #include <linux/wait.h>
35 #include <linux/poll.h>
36 #include <linux/slab.h>
37 #include <linux/freezer.h>
38 #include <linux/uaccess.h>
39 #include <linux/miscdevice.h>
40 #include <linux/pm_runtime.h>
41 #include <linux/atomic.h>
42 #include "lis3lv02d.h"
43
44 #define DRIVER_NAME "lis3lv02d"
45
46 /* joystick device poll interval in milliseconds */
47 #define MDPS_POLL_INTERVAL 50
48 #define MDPS_POLL_MIN 0
49 #define MDPS_POLL_MAX 2000
50
51 #define LIS3_SYSFS_POWERDOWN_DELAY 5000 /* In milliseconds */
52
53 #define SELFTEST_OK 0
54 #define SELFTEST_FAIL -1
55 #define SELFTEST_IRQ -2
56
57 #define IRQ_LINE0 0
58 #define IRQ_LINE1 1
59
60 /*
61 * The sensor can also generate interrupts (DRDY) but it's pretty pointless
62 * because they are generated even if the data do not change. So it's better
63 * to keep the interrupt for the free-fall event. The values are updated at
64 * 40Hz (at the lowest frequency), but as it can be pretty time consuming on
65 * some low processor, we poll the sensor only at 20Hz... enough for the
66 * joystick.
67 */
68
69 #define LIS3_PWRON_DELAY_WAI_12B (5000)
70 #define LIS3_PWRON_DELAY_WAI_8B (3000)
71
72 /*
73 * LIS3LV02D spec says 1024 LSBs corresponds 1 G -> 1LSB is 1000/1024 mG
74 * LIS302D spec says: 18 mG / digit
75 * LIS3_ACCURACY is used to increase accuracy of the intermediate
76 * calculation results.
77 */
78 #define LIS3_ACCURACY 1024
79 /* Sensitivity values for -2G +2G scale */
80 #define LIS3_SENSITIVITY_12B ((LIS3_ACCURACY * 1000) / 1024)
81 #define LIS3_SENSITIVITY_8B (18 * LIS3_ACCURACY)
82
83 #define LIS3_DEFAULT_FUZZ_12B 3
84 #define LIS3_DEFAULT_FLAT_12B 3
85 #define LIS3_DEFAULT_FUZZ_8B 1
86 #define LIS3_DEFAULT_FLAT_8B 1
87
88 struct lis3lv02d lis3_dev = {
89 .misc_wait = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait),
90 };
91 EXPORT_SYMBOL_GPL(lis3_dev);
92
93 /* just like param_set_int() but does sanity-check so that it won't point
94 * over the axis array size
95 */
96 static int param_set_axis(const char *val, const struct kernel_param *kp)
97 {
98 int ret = param_set_int(val, kp);
99 if (!ret) {
100 int val = *(int *)kp->arg;
101 if (val < 0)
102 val = -val;
103 if (!val || val > 3)
104 return -EINVAL;
105 }
106 return ret;
107 }
108
109 static struct kernel_param_ops param_ops_axis = {
110 .set = param_set_axis,
111 .get = param_get_int,
112 };
113
114 module_param_array_named(axes, lis3_dev.ac.as_array, axis, NULL, 0644);
115 MODULE_PARM_DESC(axes, "Axis-mapping for x,y,z directions");
116
117 static s16 lis3lv02d_read_8(struct lis3lv02d *lis3, int reg)
118 {
119 s8 lo;
120 if (lis3->read(lis3, reg, &lo) < 0)
121 return 0;
122
123 return lo;
124 }
125
126 static s16 lis3lv02d_read_12(struct lis3lv02d *lis3, int reg)
127 {
128 u8 lo, hi;
129
130 lis3->read(lis3, reg - 1, &lo);
131 lis3->read(lis3, reg, &hi);
132 /* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */
133 return (s16)((hi << 8) | lo);
134 }
135
136 /**
137 * lis3lv02d_get_axis - For the given axis, give the value converted
138 * @axis: 1,2,3 - can also be negative
139 * @hw_values: raw values returned by the hardware
140 *
141 * Returns the converted value.
142 */
143 static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3])
144 {
145 if (axis > 0)
146 return hw_values[axis - 1];
147 else
148 return -hw_values[-axis - 1];
149 }
150
151 /**
152 * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer
153 * @lis3: pointer to the device struct
154 * @x: where to store the X axis value
155 * @y: where to store the Y axis value
156 * @z: where to store the Z axis value
157 *
158 * Note that 40Hz input device can eat up about 10% CPU at 800MHZ
159 */
160 static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z)
161 {
162 int position[3];
163 int i;
164
165 if (lis3->blkread) {
166 if (lis3_dev.whoami == WAI_12B) {
167 u16 data[3];
168 lis3->blkread(lis3, OUTX_L, 6, (u8 *)data);
169 for (i = 0; i < 3; i++)
170 position[i] = (s16)le16_to_cpu(data[i]);
171 } else {
172 u8 data[5];
173 /* Data: x, dummy, y, dummy, z */
174 lis3->blkread(lis3, OUTX, 5, data);
175 for (i = 0; i < 3; i++)
176 position[i] = (s8)data[i * 2];
177 }
178 } else {
179 position[0] = lis3->read_data(lis3, OUTX);
180 position[1] = lis3->read_data(lis3, OUTY);
181 position[2] = lis3->read_data(lis3, OUTZ);
182 }
183
184 for (i = 0; i < 3; i++)
185 position[i] = (position[i] * lis3->scale) / LIS3_ACCURACY;
186
187 *x = lis3lv02d_get_axis(lis3->ac.x, position);
188 *y = lis3lv02d_get_axis(lis3->ac.y, position);
189 *z = lis3lv02d_get_axis(lis3->ac.z, position);
190 }
191
192 /* conversion btw sampling rate and the register values */
193 static int lis3_12_rates[4] = {40, 160, 640, 2560};
194 static int lis3_8_rates[2] = {100, 400};
195 static int lis3_3dc_rates[16] = {0, 1, 10, 25, 50, 100, 200, 400, 1600, 5000};
196
197 /* ODR is Output Data Rate */
198 static int lis3lv02d_get_odr(void)
199 {
200 u8 ctrl;
201 int shift;
202
203 lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl);
204 ctrl &= lis3_dev.odr_mask;
205 shift = ffs(lis3_dev.odr_mask) - 1;
206 return lis3_dev.odrs[(ctrl >> shift)];
207 }
208
209 static int lis3lv02d_set_odr(int rate)
210 {
211 u8 ctrl;
212 int i, len, shift;
213
214 if (!rate)
215 return -EINVAL;
216
217 lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl);
218 ctrl &= ~lis3_dev.odr_mask;
219 len = 1 << hweight_long(lis3_dev.odr_mask); /* # of possible values */
220 shift = ffs(lis3_dev.odr_mask) - 1;
221
222 for (i = 0; i < len; i++)
223 if (lis3_dev.odrs[i] == rate) {
224 lis3_dev.write(&lis3_dev, CTRL_REG1,
225 ctrl | (i << shift));
226 return 0;
227 }
228 return -EINVAL;
229 }
230
231 static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
232 {
233 u8 ctlreg, reg;
234 s16 x, y, z;
235 u8 selftest;
236 int ret;
237 u8 ctrl_reg_data;
238 unsigned char irq_cfg;
239
240 mutex_lock(&lis3->mutex);
241
242 irq_cfg = lis3->irq_cfg;
243 if (lis3_dev.whoami == WAI_8B) {
244 lis3->data_ready_count[IRQ_LINE0] = 0;
245 lis3->data_ready_count[IRQ_LINE1] = 0;
246
247 /* Change interrupt cfg to data ready for selftest */
248 atomic_inc(&lis3_dev.wake_thread);
249 lis3->irq_cfg = LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY;
250 lis3->read(lis3, CTRL_REG3, &ctrl_reg_data);
251 lis3->write(lis3, CTRL_REG3, (ctrl_reg_data &
252 ~(LIS3_IRQ1_MASK | LIS3_IRQ2_MASK)) |
253 (LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY));
254 }
255
256 if (lis3_dev.whoami == WAI_3DC) {
257 ctlreg = CTRL_REG4;
258 selftest = CTRL4_ST0;
259 } else {
260 ctlreg = CTRL_REG1;
261 if (lis3_dev.whoami == WAI_12B)
262 selftest = CTRL1_ST;
263 else
264 selftest = CTRL1_STP;
265 }
266
267 lis3->read(lis3, ctlreg, &reg);
268 lis3->write(lis3, ctlreg, (reg | selftest));
269 msleep(lis3->pwron_delay / lis3lv02d_get_odr());
270
271 /* Read directly to avoid axis remap */
272 x = lis3->read_data(lis3, OUTX);
273 y = lis3->read_data(lis3, OUTY);
274 z = lis3->read_data(lis3, OUTZ);
275
276 /* back to normal settings */
277 lis3->write(lis3, ctlreg, reg);
278 msleep(lis3->pwron_delay / lis3lv02d_get_odr());
279
280 results[0] = x - lis3->read_data(lis3, OUTX);
281 results[1] = y - lis3->read_data(lis3, OUTY);
282 results[2] = z - lis3->read_data(lis3, OUTZ);
283
284 ret = 0;
285
286 if (lis3_dev.whoami == WAI_8B) {
287 /* Restore original interrupt configuration */
288 atomic_dec(&lis3_dev.wake_thread);
289 lis3->write(lis3, CTRL_REG3, ctrl_reg_data);
290 lis3->irq_cfg = irq_cfg;
291
292 if ((irq_cfg & LIS3_IRQ1_MASK) &&
293 lis3->data_ready_count[IRQ_LINE0] < 2) {
294 ret = SELFTEST_IRQ;
295 goto fail;
296 }
297
298 if ((irq_cfg & LIS3_IRQ2_MASK) &&
299 lis3->data_ready_count[IRQ_LINE1] < 2) {
300 ret = SELFTEST_IRQ;
301 goto fail;
302 }
303 }
304
305 if (lis3->pdata) {
306 int i;
307 for (i = 0; i < 3; i++) {
308 /* Check against selftest acceptance limits */
309 if ((results[i] < lis3->pdata->st_min_limits[i]) ||
310 (results[i] > lis3->pdata->st_max_limits[i])) {
311 ret = SELFTEST_FAIL;
312 goto fail;
313 }
314 }
315 }
316
317 /* test passed */
318 fail:
319 mutex_unlock(&lis3->mutex);
320 return ret;
321 }
322
323 /*
324 * Order of registers in the list affects to order of the restore process.
325 * Perhaps it is a good idea to set interrupt enable register as a last one
326 * after all other configurations
327 */
328 static u8 lis3_wai8_regs[] = { FF_WU_CFG_1, FF_WU_THS_1, FF_WU_DURATION_1,
329 FF_WU_CFG_2, FF_WU_THS_2, FF_WU_DURATION_2,
330 CLICK_CFG, CLICK_SRC, CLICK_THSY_X, CLICK_THSZ,
331 CLICK_TIMELIMIT, CLICK_LATENCY, CLICK_WINDOW,
332 CTRL_REG1, CTRL_REG2, CTRL_REG3};
333
334 static u8 lis3_wai12_regs[] = {FF_WU_CFG, FF_WU_THS_L, FF_WU_THS_H,
335 FF_WU_DURATION, DD_CFG, DD_THSI_L, DD_THSI_H,
336 DD_THSE_L, DD_THSE_H,
337 CTRL_REG1, CTRL_REG3, CTRL_REG2};
338
339 static inline void lis3_context_save(struct lis3lv02d *lis3)
340 {
341 int i;
342 for (i = 0; i < lis3->regs_size; i++)
343 lis3->read(lis3, lis3->regs[i], &lis3->reg_cache[i]);
344 lis3->regs_stored = true;
345 }
346
347 static inline void lis3_context_restore(struct lis3lv02d *lis3)
348 {
349 int i;
350 if (lis3->regs_stored)
351 for (i = 0; i < lis3->regs_size; i++)
352 lis3->write(lis3, lis3->regs[i], lis3->reg_cache[i]);
353 }
354
355 void lis3lv02d_poweroff(struct lis3lv02d *lis3)
356 {
357 if (lis3->reg_ctrl)
358 lis3_context_save(lis3);
359 /* disable X,Y,Z axis and power down */
360 lis3->write(lis3, CTRL_REG1, 0x00);
361 if (lis3->reg_ctrl)
362 lis3->reg_ctrl(lis3, LIS3_REG_OFF);
363 }
364 EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);
365
366 void lis3lv02d_poweron(struct lis3lv02d *lis3)
367 {
368 u8 reg;
369
370 lis3->init(lis3);
371
372 /*
373 * Common configuration
374 * BDU: (12 bits sensors only) LSB and MSB values are not updated until
375 * both have been read. So the value read will always be correct.
376 * Set BOOT bit to refresh factory tuning values.
377 */
378 if (lis3->pdata) {
379 lis3->read(lis3, CTRL_REG2, &reg);
380 if (lis3->whoami == WAI_12B)
381 reg |= CTRL2_BDU | CTRL2_BOOT;
382 else
383 reg |= CTRL2_BOOT_8B;
384 lis3->write(lis3, CTRL_REG2, reg);
385 }
386
387 /* LIS3 power on delay is quite long */
388 msleep(lis3->pwron_delay / lis3lv02d_get_odr());
389
390 if (lis3->reg_ctrl)
391 lis3_context_restore(lis3);
392 }
393 EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
394
395
396 static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev)
397 {
398 int x, y, z;
399
400 mutex_lock(&lis3_dev.mutex);
401 lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
402 input_report_abs(pidev->input, ABS_X, x);
403 input_report_abs(pidev->input, ABS_Y, y);
404 input_report_abs(pidev->input, ABS_Z, z);
405 input_sync(pidev->input);
406 mutex_unlock(&lis3_dev.mutex);
407 }
408
409 static void lis3lv02d_joystick_open(struct input_polled_dev *pidev)
410 {
411 if (lis3_dev.pm_dev)
412 pm_runtime_get_sync(lis3_dev.pm_dev);
413
414 if (lis3_dev.pdata && lis3_dev.whoami == WAI_8B && lis3_dev.idev)
415 atomic_set(&lis3_dev.wake_thread, 1);
416 /*
417 * Update coordinates for the case where poll interval is 0 and
418 * the chip in running purely under interrupt control
419 */
420 lis3lv02d_joystick_poll(pidev);
421 }
422
423 static void lis3lv02d_joystick_close(struct input_polled_dev *pidev)
424 {
425 atomic_set(&lis3_dev.wake_thread, 0);
426 if (lis3_dev.pm_dev)
427 pm_runtime_put(lis3_dev.pm_dev);
428 }
429
430 static irqreturn_t lis302dl_interrupt(int irq, void *dummy)
431 {
432 if (!test_bit(0, &lis3_dev.misc_opened))
433 goto out;
434
435 /*
436 * Be careful: on some HP laptops the bios force DD when on battery and
437 * the lid is closed. This leads to interrupts as soon as a little move
438 * is done.
439 */
440 atomic_inc(&lis3_dev.count);
441
442 wake_up_interruptible(&lis3_dev.misc_wait);
443 kill_fasync(&lis3_dev.async_queue, SIGIO, POLL_IN);
444 out:
445 if (atomic_read(&lis3_dev.wake_thread))
446 return IRQ_WAKE_THREAD;
447 return IRQ_HANDLED;
448 }
449
450 static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3)
451 {
452 struct input_dev *dev = lis3->idev->input;
453 u8 click_src;
454
455 mutex_lock(&lis3->mutex);
456 lis3->read(lis3, CLICK_SRC, &click_src);
457
458 if (click_src & CLICK_SINGLE_X) {
459 input_report_key(dev, lis3->mapped_btns[0], 1);
460 input_report_key(dev, lis3->mapped_btns[0], 0);
461 }
462
463 if (click_src & CLICK_SINGLE_Y) {
464 input_report_key(dev, lis3->mapped_btns[1], 1);
465 input_report_key(dev, lis3->mapped_btns[1], 0);
466 }
467
468 if (click_src & CLICK_SINGLE_Z) {
469 input_report_key(dev, lis3->mapped_btns[2], 1);
470 input_report_key(dev, lis3->mapped_btns[2], 0);
471 }
472 input_sync(dev);
473 mutex_unlock(&lis3->mutex);
474 }
475
476 static inline void lis302dl_data_ready(struct lis3lv02d *lis3, int index)
477 {
478 int dummy;
479
480 /* Dummy read to ack interrupt */
481 lis3lv02d_get_xyz(lis3, &dummy, &dummy, &dummy);
482 lis3->data_ready_count[index]++;
483 }
484
485 static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data)
486 {
487 struct lis3lv02d *lis3 = data;
488 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ1_MASK;
489
490 if (irq_cfg == LIS3_IRQ1_CLICK)
491 lis302dl_interrupt_handle_click(lis3);
492 else if (unlikely(irq_cfg == LIS3_IRQ1_DATA_READY))
493 lis302dl_data_ready(lis3, IRQ_LINE0);
494 else
495 lis3lv02d_joystick_poll(lis3->idev);
496
497 return IRQ_HANDLED;
498 }
499
500 static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data)
501 {
502 struct lis3lv02d *lis3 = data;
503 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ2_MASK;
504
505 if (irq_cfg == LIS3_IRQ2_CLICK)
506 lis302dl_interrupt_handle_click(lis3);
507 else if (unlikely(irq_cfg == LIS3_IRQ2_DATA_READY))
508 lis302dl_data_ready(lis3, IRQ_LINE1);
509 else
510 lis3lv02d_joystick_poll(lis3->idev);
511
512 return IRQ_HANDLED;
513 }
514
515 static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
516 {
517 if (test_and_set_bit(0, &lis3_dev.misc_opened))
518 return -EBUSY; /* already open */
519
520 if (lis3_dev.pm_dev)
521 pm_runtime_get_sync(lis3_dev.pm_dev);
522
523 atomic_set(&lis3_dev.count, 0);
524 return 0;
525 }
526
527 static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
528 {
529 fasync_helper(-1, file, 0, &lis3_dev.async_queue);
530 clear_bit(0, &lis3_dev.misc_opened); /* release the device */
531 if (lis3_dev.pm_dev)
532 pm_runtime_put(lis3_dev.pm_dev);
533 return 0;
534 }
535
536 static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf,
537 size_t count, loff_t *pos)
538 {
539 DECLARE_WAITQUEUE(wait, current);
540 u32 data;
541 unsigned char byte_data;
542 ssize_t retval = 1;
543
544 if (count < 1)
545 return -EINVAL;
546
547 add_wait_queue(&lis3_dev.misc_wait, &wait);
548 while (true) {
549 set_current_state(TASK_INTERRUPTIBLE);
550 data = atomic_xchg(&lis3_dev.count, 0);
551 if (data)
552 break;
553
554 if (file->f_flags & O_NONBLOCK) {
555 retval = -EAGAIN;
556 goto out;
557 }
558
559 if (signal_pending(current)) {
560 retval = -ERESTARTSYS;
561 goto out;
562 }
563
564 schedule();
565 }
566
567 if (data < 255)
568 byte_data = data;
569 else
570 byte_data = 255;
571
572 /* make sure we are not going into copy_to_user() with
573 * TASK_INTERRUPTIBLE state */
574 set_current_state(TASK_RUNNING);
575 if (copy_to_user(buf, &byte_data, sizeof(byte_data)))
576 retval = -EFAULT;
577
578 out:
579 __set_current_state(TASK_RUNNING);
580 remove_wait_queue(&lis3_dev.misc_wait, &wait);
581
582 return retval;
583 }
584
585 static unsigned int lis3lv02d_misc_poll(struct file *file, poll_table *wait)
586 {
587 poll_wait(file, &lis3_dev.misc_wait, wait);
588 if (atomic_read(&lis3_dev.count))
589 return POLLIN | POLLRDNORM;
590 return 0;
591 }
592
593 static int lis3lv02d_misc_fasync(int fd, struct file *file, int on)
594 {
595 return fasync_helper(fd, file, on, &lis3_dev.async_queue);
596 }
597
598 static const struct file_operations lis3lv02d_misc_fops = {
599 .owner = THIS_MODULE,
600 .llseek = no_llseek,
601 .read = lis3lv02d_misc_read,
602 .open = lis3lv02d_misc_open,
603 .release = lis3lv02d_misc_release,
604 .poll = lis3lv02d_misc_poll,
605 .fasync = lis3lv02d_misc_fasync,
606 };
607
608 static struct miscdevice lis3lv02d_misc_device = {
609 .minor = MISC_DYNAMIC_MINOR,
610 .name = "freefall",
611 .fops = &lis3lv02d_misc_fops,
612 };
613
614 int lis3lv02d_joystick_enable(void)
615 {
616 struct input_dev *input_dev;
617 int err;
618 int max_val, fuzz, flat;
619 int btns[] = {BTN_X, BTN_Y, BTN_Z};
620
621 if (lis3_dev.idev)
622 return -EINVAL;
623
624 lis3_dev.idev = input_allocate_polled_device();
625 if (!lis3_dev.idev)
626 return -ENOMEM;
627
628 lis3_dev.idev->poll = lis3lv02d_joystick_poll;
629 lis3_dev.idev->open = lis3lv02d_joystick_open;
630 lis3_dev.idev->close = lis3lv02d_joystick_close;
631 lis3_dev.idev->poll_interval = MDPS_POLL_INTERVAL;
632 lis3_dev.idev->poll_interval_min = MDPS_POLL_MIN;
633 lis3_dev.idev->poll_interval_max = MDPS_POLL_MAX;
634 input_dev = lis3_dev.idev->input;
635
636 input_dev->name = "ST LIS3LV02DL Accelerometer";
637 input_dev->phys = DRIVER_NAME "/input0";
638 input_dev->id.bustype = BUS_HOST;
639 input_dev->id.vendor = 0;
640 input_dev->dev.parent = &lis3_dev.pdev->dev;
641
642 set_bit(EV_ABS, input_dev->evbit);
643 max_val = (lis3_dev.mdps_max_val * lis3_dev.scale) / LIS3_ACCURACY;
644 if (lis3_dev.whoami == WAI_12B) {
645 fuzz = LIS3_DEFAULT_FUZZ_12B;
646 flat = LIS3_DEFAULT_FLAT_12B;
647 } else {
648 fuzz = LIS3_DEFAULT_FUZZ_8B;
649 flat = LIS3_DEFAULT_FLAT_8B;
650 }
651 fuzz = (fuzz * lis3_dev.scale) / LIS3_ACCURACY;
652 flat = (flat * lis3_dev.scale) / LIS3_ACCURACY;
653
654 input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat);
655 input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat);
656 input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat);
657
658 lis3_dev.mapped_btns[0] = lis3lv02d_get_axis(abs(lis3_dev.ac.x), btns);
659 lis3_dev.mapped_btns[1] = lis3lv02d_get_axis(abs(lis3_dev.ac.y), btns);
660 lis3_dev.mapped_btns[2] = lis3lv02d_get_axis(abs(lis3_dev.ac.z), btns);
661
662 err = input_register_polled_device(lis3_dev.idev);
663 if (err) {
664 input_free_polled_device(lis3_dev.idev);
665 lis3_dev.idev = NULL;
666 }
667
668 return err;
669 }
670 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
671
672 void lis3lv02d_joystick_disable(void)
673 {
674 if (lis3_dev.irq)
675 free_irq(lis3_dev.irq, &lis3_dev);
676 if (lis3_dev.pdata && lis3_dev.pdata->irq2)
677 free_irq(lis3_dev.pdata->irq2, &lis3_dev);
678
679 if (!lis3_dev.idev)
680 return;
681
682 if (lis3_dev.irq)
683 misc_deregister(&lis3lv02d_misc_device);
684 input_unregister_polled_device(lis3_dev.idev);
685 input_free_polled_device(lis3_dev.idev);
686 lis3_dev.idev = NULL;
687 }
688 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
689
690 /* Sysfs stuff */
691 static void lis3lv02d_sysfs_poweron(struct lis3lv02d *lis3)
692 {
693 /*
694 * SYSFS functions are fast visitors so put-call
695 * immediately after the get-call. However, keep
696 * chip running for a while and schedule delayed
697 * suspend. This way periodic sysfs calls doesn't
698 * suffer from relatively long power up time.
699 */
700
701 if (lis3->pm_dev) {
702 pm_runtime_get_sync(lis3->pm_dev);
703 pm_runtime_put_noidle(lis3->pm_dev);
704 pm_schedule_suspend(lis3->pm_dev, LIS3_SYSFS_POWERDOWN_DELAY);
705 }
706 }
707
708 static ssize_t lis3lv02d_selftest_show(struct device *dev,
709 struct device_attribute *attr, char *buf)
710 {
711 s16 values[3];
712
713 static const char ok[] = "OK";
714 static const char fail[] = "FAIL";
715 static const char irq[] = "FAIL_IRQ";
716 const char *res;
717
718 lis3lv02d_sysfs_poweron(&lis3_dev);
719 switch (lis3lv02d_selftest(&lis3_dev, values)) {
720 case SELFTEST_FAIL:
721 res = fail;
722 break;
723 case SELFTEST_IRQ:
724 res = irq;
725 break;
726 case SELFTEST_OK:
727 default:
728 res = ok;
729 break;
730 }
731 return sprintf(buf, "%s %d %d %d\n", res,
732 values[0], values[1], values[2]);
733 }
734
735 static ssize_t lis3lv02d_position_show(struct device *dev,
736 struct device_attribute *attr, char *buf)
737 {
738 int x, y, z;
739
740 lis3lv02d_sysfs_poweron(&lis3_dev);
741 mutex_lock(&lis3_dev.mutex);
742 lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
743 mutex_unlock(&lis3_dev.mutex);
744 return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
745 }
746
747 static ssize_t lis3lv02d_rate_show(struct device *dev,
748 struct device_attribute *attr, char *buf)
749 {
750 lis3lv02d_sysfs_poweron(&lis3_dev);
751 return sprintf(buf, "%d\n", lis3lv02d_get_odr());
752 }
753
754 static ssize_t lis3lv02d_rate_set(struct device *dev,
755 struct device_attribute *attr, const char *buf,
756 size_t count)
757 {
758 unsigned long rate;
759
760 if (strict_strtoul(buf, 0, &rate))
761 return -EINVAL;
762
763 lis3lv02d_sysfs_poweron(&lis3_dev);
764 if (lis3lv02d_set_odr(rate))
765 return -EINVAL;
766
767 return count;
768 }
769
770 static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL);
771 static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
772 static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show,
773 lis3lv02d_rate_set);
774
775 static struct attribute *lis3lv02d_attributes[] = {
776 &dev_attr_selftest.attr,
777 &dev_attr_position.attr,
778 &dev_attr_rate.attr,
779 NULL
780 };
781
782 static struct attribute_group lis3lv02d_attribute_group = {
783 .attrs = lis3lv02d_attributes
784 };
785
786
787 static int lis3lv02d_add_fs(struct lis3lv02d *lis3)
788 {
789 lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
790 if (IS_ERR(lis3->pdev))
791 return PTR_ERR(lis3->pdev);
792
793 return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
794 }
795
796 int lis3lv02d_remove_fs(struct lis3lv02d *lis3)
797 {
798 sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
799 platform_device_unregister(lis3->pdev);
800 if (lis3->pm_dev) {
801 /* Barrier after the sysfs remove */
802 pm_runtime_barrier(lis3->pm_dev);
803
804 /* SYSFS may have left chip running. Turn off if necessary */
805 if (!pm_runtime_suspended(lis3->pm_dev))
806 lis3lv02d_poweroff(&lis3_dev);
807
808 pm_runtime_disable(lis3->pm_dev);
809 pm_runtime_set_suspended(lis3->pm_dev);
810 }
811 kfree(lis3->reg_cache);
812 return 0;
813 }
814 EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
815
816 static void lis3lv02d_8b_configure(struct lis3lv02d *dev,
817 struct lis3lv02d_platform_data *p)
818 {
819 int err;
820 int ctrl2 = p->hipass_ctrl;
821
822 if (p->click_flags) {
823 dev->write(dev, CLICK_CFG, p->click_flags);
824 dev->write(dev, CLICK_TIMELIMIT, p->click_time_limit);
825 dev->write(dev, CLICK_LATENCY, p->click_latency);
826 dev->write(dev, CLICK_WINDOW, p->click_window);
827 dev->write(dev, CLICK_THSZ, p->click_thresh_z & 0xf);
828 dev->write(dev, CLICK_THSY_X,
829 (p->click_thresh_x & 0xf) |
830 (p->click_thresh_y << 4));
831
832 if (dev->idev) {
833 struct input_dev *input_dev = lis3_dev.idev->input;
834 input_set_capability(input_dev, EV_KEY, BTN_X);
835 input_set_capability(input_dev, EV_KEY, BTN_Y);
836 input_set_capability(input_dev, EV_KEY, BTN_Z);
837 }
838 }
839
840 if (p->wakeup_flags) {
841 dev->write(dev, FF_WU_CFG_1, p->wakeup_flags);
842 dev->write(dev, FF_WU_THS_1, p->wakeup_thresh & 0x7f);
843 /* pdata value + 1 to keep this backward compatible*/
844 dev->write(dev, FF_WU_DURATION_1, p->duration1 + 1);
845 ctrl2 ^= HP_FF_WU1; /* Xor to keep compatible with old pdata*/
846 }
847
848 if (p->wakeup_flags2) {
849 dev->write(dev, FF_WU_CFG_2, p->wakeup_flags2);
850 dev->write(dev, FF_WU_THS_2, p->wakeup_thresh2 & 0x7f);
851 /* pdata value + 1 to keep this backward compatible*/
852 dev->write(dev, FF_WU_DURATION_2, p->duration2 + 1);
853 ctrl2 ^= HP_FF_WU2; /* Xor to keep compatible with old pdata*/
854 }
855 /* Configure hipass filters */
856 dev->write(dev, CTRL_REG2, ctrl2);
857
858 if (p->irq2) {
859 err = request_threaded_irq(p->irq2,
860 NULL,
861 lis302dl_interrupt_thread2_8b,
862 IRQF_TRIGGER_RISING | IRQF_ONESHOT |
863 (p->irq_flags2 & IRQF_TRIGGER_MASK),
864 DRIVER_NAME, &lis3_dev);
865 if (err < 0)
866 pr_err("No second IRQ. Limited functionality\n");
867 }
868 }
869
870 /*
871 * Initialise the accelerometer and the various subsystems.
872 * Should be rather independent of the bus system.
873 */
874 int lis3lv02d_init_device(struct lis3lv02d *dev)
875 {
876 int err;
877 irq_handler_t thread_fn;
878 int irq_flags = 0;
879
880 dev->whoami = lis3lv02d_read_8(dev, WHO_AM_I);
881
882 switch (dev->whoami) {
883 case WAI_12B:
884 pr_info("12 bits sensor found\n");
885 dev->read_data = lis3lv02d_read_12;
886 dev->mdps_max_val = 2048;
887 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_12B;
888 dev->odrs = lis3_12_rates;
889 dev->odr_mask = CTRL1_DF0 | CTRL1_DF1;
890 dev->scale = LIS3_SENSITIVITY_12B;
891 dev->regs = lis3_wai12_regs;
892 dev->regs_size = ARRAY_SIZE(lis3_wai12_regs);
893 break;
894 case WAI_8B:
895 pr_info("8 bits sensor found\n");
896 dev->read_data = lis3lv02d_read_8;
897 dev->mdps_max_val = 128;
898 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
899 dev->odrs = lis3_8_rates;
900 dev->odr_mask = CTRL1_DR;
901 dev->scale = LIS3_SENSITIVITY_8B;
902 dev->regs = lis3_wai8_regs;
903 dev->regs_size = ARRAY_SIZE(lis3_wai8_regs);
904 break;
905 case WAI_3DC:
906 pr_info("8 bits 3DC sensor found\n");
907 dev->read_data = lis3lv02d_read_8;
908 dev->mdps_max_val = 128;
909 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
910 dev->odrs = lis3_3dc_rates;
911 dev->odr_mask = CTRL1_ODR0|CTRL1_ODR1|CTRL1_ODR2|CTRL1_ODR3;
912 dev->scale = LIS3_SENSITIVITY_8B;
913 break;
914 default:
915 pr_err("unknown sensor type 0x%X\n", dev->whoami);
916 return -EINVAL;
917 }
918
919 dev->reg_cache = kzalloc(max(sizeof(lis3_wai8_regs),
920 sizeof(lis3_wai12_regs)), GFP_KERNEL);
921
922 if (dev->reg_cache == NULL) {
923 printk(KERN_ERR DRIVER_NAME "out of memory\n");
924 return -ENOMEM;
925 }
926
927 mutex_init(&dev->mutex);
928 atomic_set(&dev->wake_thread, 0);
929
930 lis3lv02d_add_fs(dev);
931 lis3lv02d_poweron(dev);
932
933 if (dev->pm_dev) {
934 pm_runtime_set_active(dev->pm_dev);
935 pm_runtime_enable(dev->pm_dev);
936 }
937
938 if (lis3lv02d_joystick_enable())
939 pr_err("joystick initialization failed\n");
940
941 /* passing in platform specific data is purely optional and only
942 * used by the SPI transport layer at the moment */
943 if (dev->pdata) {
944 struct lis3lv02d_platform_data *p = dev->pdata;
945
946 if (dev->whoami == WAI_8B)
947 lis3lv02d_8b_configure(dev, p);
948
949 irq_flags = p->irq_flags1 & IRQF_TRIGGER_MASK;
950
951 dev->irq_cfg = p->irq_cfg;
952 if (p->irq_cfg)
953 dev->write(dev, CTRL_REG3, p->irq_cfg);
954
955 if (p->default_rate)
956 lis3lv02d_set_odr(p->default_rate);
957 }
958
959 /* bail if we did not get an IRQ from the bus layer */
960 if (!dev->irq) {
961 pr_debug("No IRQ. Disabling /dev/freefall\n");
962 goto out;
963 }
964
965 /*
966 * The sensor can generate interrupts for free-fall and direction
967 * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep
968 * the things simple and _fast_ we activate it only for free-fall, so
969 * no need to read register (very slow with ACPI). For the same reason,
970 * we forbid shared interrupts.
971 *
972 * IRQF_TRIGGER_RISING seems pointless on HP laptops because the
973 * io-apic is not configurable (and generates a warning) but I keep it
974 * in case of support for other hardware.
975 */
976 if (dev->pdata && dev->whoami == WAI_8B)
977 thread_fn = lis302dl_interrupt_thread1_8b;
978 else
979 thread_fn = NULL;
980
981 err = request_threaded_irq(dev->irq, lis302dl_interrupt,
982 thread_fn,
983 IRQF_TRIGGER_RISING | IRQF_ONESHOT |
984 irq_flags,
985 DRIVER_NAME, &lis3_dev);
986
987 if (err < 0) {
988 pr_err("Cannot get IRQ\n");
989 goto out;
990 }
991
992 if (misc_register(&lis3lv02d_misc_device))
993 pr_err("misc_register failed\n");
994 out:
995 return 0;
996 }
997 EXPORT_SYMBOL_GPL(lis3lv02d_init_device);
998
999 MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
1000 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
1001 MODULE_LICENSE("GPL");
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