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Signed-off-by: Ilkka Koskinen <ilkka.koskinen@nokia.com>
[linux-2.6/next.git] / drivers / misc / lis3lv02d / lis3lv02d.c
blobe67dceab552b3d11ac7f472ffd939b0cd42d5342
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->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(struct lis3lv02d *lis3)
199 {
200 u8 ctrl;
201 int shift;
202
203 lis3->read(&lis3, CTRL_REG1, &ctrl);
204 ctrl &= lis3->odr_mask;
205 shift = ffs(lis3->odr_mask) - 1;
206 return lis3->odrs[(ctrl >> shift)];
207 }
208
209 static int lis3lv02d_get_pwron_wait(struct lis3lv02d *lis3)
210 {
211 int div = lis3lv02d_get_odr(lis3);
212
213 if (WARN_ONCE(div == 0, "device returned spurious data"))
214 return -ENXIO;
215
216 /* LIS3 power on delay is quite long */
217 msleep(lis3->pwron_delay / div);
218 return 0;
219 }
220
221 static int lis3lv02d_set_odr(struct lis3lv02d *lis3, int rate)
222 {
223 u8 ctrl;
224 int i, len, shift;
225
226 if (!rate)
227 return -EINVAL;
228
229 lis3->read(lis3, CTRL_REG1, &ctrl);
230 ctrl &= ~lis3->odr_mask;
231 len = 1 << hweight_long(lis3->odr_mask); /* # of possible values */
232 shift = ffs(lis3->odr_mask) - 1;
233
234 for (i = 0; i < len; i++)
235 if (lis3->odrs[i] == rate) {
236 lis3->write(lis3, CTRL_REG1,
237 ctrl | (i << shift));
238 return 0;
239 }
240 return -EINVAL;
241 }
242
243 static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
244 {
245 u8 ctlreg, reg;
246 s16 x, y, z;
247 u8 selftest;
248 int ret;
249 u8 ctrl_reg_data;
250 unsigned char irq_cfg;
251
252 mutex_lock(&lis3->mutex);
253
254 irq_cfg = lis3->irq_cfg;
255 if (lis3->whoami == WAI_8B) {
256 lis3->data_ready_count[IRQ_LINE0] = 0;
257 lis3->data_ready_count[IRQ_LINE1] = 0;
258
259 /* Change interrupt cfg to data ready for selftest */
260 atomic_inc(&lis3->wake_thread);
261 lis3->irq_cfg = LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY;
262 lis3->read(lis3, CTRL_REG3, &ctrl_reg_data);
263 lis3->write(lis3, CTRL_REG3, (ctrl_reg_data &
264 ~(LIS3_IRQ1_MASK | LIS3_IRQ2_MASK)) |
265 (LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY));
266 }
267
268 if (lis3->whoami == WAI_3DC) {
269 ctlreg = CTRL_REG4;
270 selftest = CTRL4_ST0;
271 } else {
272 ctlreg = CTRL_REG1;
273 if (lis3->whoami == WAI_12B)
274 selftest = CTRL1_ST;
275 else
276 selftest = CTRL1_STP;
277 }
278
279 lis3->read(lis3, ctlreg, &reg);
280 lis3->write(lis3, ctlreg, (reg | selftest));
281 ret = lis3lv02d_get_pwron_wait(lis3);
282 if (ret)
283 goto fail;
284
285 /* Read directly to avoid axis remap */
286 x = lis3->read_data(lis3, OUTX);
287 y = lis3->read_data(lis3, OUTY);
288 z = lis3->read_data(lis3, OUTZ);
289
290 /* back to normal settings */
291 lis3->write(lis3, ctlreg, reg);
292 ret = lis3lv02d_get_pwron_wait(lis3);
293 if (ret)
294 goto fail;
295
296 results[0] = x - lis3->read_data(lis3, OUTX);
297 results[1] = y - lis3->read_data(lis3, OUTY);
298 results[2] = z - lis3->read_data(lis3, OUTZ);
299
300 ret = 0;
301
302 if (lis3->whoami == WAI_8B) {
303 /* Restore original interrupt configuration */
304 atomic_dec(&lis3->wake_thread);
305 lis3->write(lis3, CTRL_REG3, ctrl_reg_data);
306 lis3->irq_cfg = irq_cfg;
307
308 if ((irq_cfg & LIS3_IRQ1_MASK) &&
309 lis3->data_ready_count[IRQ_LINE0] < 2) {
310 ret = SELFTEST_IRQ;
311 goto fail;
312 }
313
314 if ((irq_cfg & LIS3_IRQ2_MASK) &&
315 lis3->data_ready_count[IRQ_LINE1] < 2) {
316 ret = SELFTEST_IRQ;
317 goto fail;
318 }
319 }
320
321 if (lis3->pdata) {
322 int i;
323 for (i = 0; i < 3; i++) {
324 /* Check against selftest acceptance limits */
325 if ((results[i] < lis3->pdata->st_min_limits[i]) ||
326 (results[i] > lis3->pdata->st_max_limits[i])) {
327 ret = SELFTEST_FAIL;
328 goto fail;
329 }
330 }
331 }
332
333 /* test passed */
334 fail:
335 mutex_unlock(&lis3->mutex);
336 return ret;
337 }
338
339 /*
340 * Order of registers in the list affects to order of the restore process.
341 * Perhaps it is a good idea to set interrupt enable register as a last one
342 * after all other configurations
343 */
344 static u8 lis3_wai8_regs[] = { FF_WU_CFG_1, FF_WU_THS_1, FF_WU_DURATION_1,
345 FF_WU_CFG_2, FF_WU_THS_2, FF_WU_DURATION_2,
346 CLICK_CFG, CLICK_SRC, CLICK_THSY_X, CLICK_THSZ,
347 CLICK_TIMELIMIT, CLICK_LATENCY, CLICK_WINDOW,
348 CTRL_REG1, CTRL_REG2, CTRL_REG3};
349
350 static u8 lis3_wai12_regs[] = {FF_WU_CFG, FF_WU_THS_L, FF_WU_THS_H,
351 FF_WU_DURATION, DD_CFG, DD_THSI_L, DD_THSI_H,
352 DD_THSE_L, DD_THSE_H,
353 CTRL_REG1, CTRL_REG3, CTRL_REG2};
354
355 static inline void lis3_context_save(struct lis3lv02d *lis3)
356 {
357 int i;
358 for (i = 0; i < lis3->regs_size; i++)
359 lis3->read(lis3, lis3->regs[i], &lis3->reg_cache[i]);
360 lis3->regs_stored = true;
361 }
362
363 static inline void lis3_context_restore(struct lis3lv02d *lis3)
364 {
365 int i;
366 if (lis3->regs_stored)
367 for (i = 0; i < lis3->regs_size; i++)
368 lis3->write(lis3, lis3->regs[i], lis3->reg_cache[i]);
369 }
370
371 void lis3lv02d_poweroff(struct lis3lv02d *lis3)
372 {
373 if (lis3->reg_ctrl)
374 lis3_context_save(lis3);
375 /* disable X,Y,Z axis and power down */
376 lis3->write(lis3, CTRL_REG1, 0x00);
377 if (lis3->reg_ctrl)
378 lis3->reg_ctrl(lis3, LIS3_REG_OFF);
379 }
380 EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);
381
382 int lis3lv02d_poweron(struct lis3lv02d *lis3)
383 {
384 int err;
385 u8 reg;
386
387 lis3->init(lis3);
388
389 /*
390 * Common configuration
391 * BDU: (12 bits sensors only) LSB and MSB values are not updated until
392 * both have been read. So the value read will always be correct.
393 * Set BOOT bit to refresh factory tuning values.
394 */
395 lis3->read(lis3, CTRL_REG2, &reg);
396 if (lis3->whoami == WAI_12B)
397 reg |= CTRL2_BDU | CTRL2_BOOT;
398 else
399 reg |= CTRL2_BOOT_8B;
400 lis3->write(lis3, CTRL_REG2, reg);
401
402 err = lis3lv02d_get_pwron_wait(lis3);
403 if (err)
404 return err;
405
406 if (lis3->reg_ctrl)
407 lis3_context_restore(lis3);
408
409 return 0;
410 }
411 EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
412
413
414 static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev)
415 {
416 struct lis3lv02d *lis3 = pidev->private;
417 int x, y, z;
418
419 mutex_lock(&lis3->mutex);
420 lis3lv02d_get_xyz(lis3, &x, &y, &z);
421 input_report_abs(pidev->input, ABS_X, x);
422 input_report_abs(pidev->input, ABS_Y, y);
423 input_report_abs(pidev->input, ABS_Z, z);
424 input_sync(pidev->input);
425 mutex_unlock(&lis3->mutex);
426 }
427
428 static void lis3lv02d_joystick_open(struct input_polled_dev *pidev)
429 {
430 struct lis3lv02d *lis3 = pidev->private;
431
432 if (lis3->pm_dev)
433 pm_runtime_get_sync(lis3->pm_dev);
434
435 if (lis3->pdata && lis3->whoami == WAI_8B && lis3->idev)
436 atomic_set(&lis3->wake_thread, 1);
437 /*
438 * Update coordinates for the case where poll interval is 0 and
439 * the chip in running purely under interrupt control
440 */
441 lis3lv02d_joystick_poll(pidev);
442 }
443
444 static void lis3lv02d_joystick_close(struct input_polled_dev *pidev)
445 {
446 struct lis3lv02d *lis3 = pidev->private;
447
448 atomic_set(&lis3->wake_thread, 0);
449 if (lis3->pm_dev)
450 pm_runtime_put(lis3->pm_dev);
451 }
452
453 static irqreturn_t lis302dl_interrupt(int irq, void *data)
454 {
455 struct lis3lv02d *lis3 = data;
456
457 if (!test_bit(0, &lis3->misc_opened))
458 goto out;
459
460 /*
461 * Be careful: on some HP laptops the bios force DD when on battery and
462 * the lid is closed. This leads to interrupts as soon as a little move
463 * is done.
464 */
465 atomic_inc(&lis3->count);
466
467 wake_up_interruptible(&lis3->misc_wait);
468 kill_fasync(&lis3->async_queue, SIGIO, POLL_IN);
469 out:
470 if (atomic_read(&lis3->wake_thread))
471 return IRQ_WAKE_THREAD;
472 return IRQ_HANDLED;
473 }
474
475 static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3)
476 {
477 struct input_dev *dev = lis3->idev->input;
478 u8 click_src;
479
480 mutex_lock(&lis3->mutex);
481 lis3->read(lis3, CLICK_SRC, &click_src);
482
483 if (click_src & CLICK_SINGLE_X) {
484 input_report_key(dev, lis3->mapped_btns[0], 1);
485 input_report_key(dev, lis3->mapped_btns[0], 0);
486 }
487
488 if (click_src & CLICK_SINGLE_Y) {
489 input_report_key(dev, lis3->mapped_btns[1], 1);
490 input_report_key(dev, lis3->mapped_btns[1], 0);
491 }
492
493 if (click_src & CLICK_SINGLE_Z) {
494 input_report_key(dev, lis3->mapped_btns[2], 1);
495 input_report_key(dev, lis3->mapped_btns[2], 0);
496 }
497 input_sync(dev);
498 mutex_unlock(&lis3->mutex);
499 }
500
501 static inline void lis302dl_data_ready(struct lis3lv02d *lis3, int index)
502 {
503 int dummy;
504
505 /* Dummy read to ack interrupt */
506 lis3lv02d_get_xyz(lis3, &dummy, &dummy, &dummy);
507 lis3->data_ready_count[index]++;
508 }
509
510 static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data)
511 {
512 struct lis3lv02d *lis3 = data;
513 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ1_MASK;
514
515 if (irq_cfg == LIS3_IRQ1_CLICK)
516 lis302dl_interrupt_handle_click(lis3);
517 else if (unlikely(irq_cfg == LIS3_IRQ1_DATA_READY))
518 lis302dl_data_ready(lis3, IRQ_LINE0);
519 else
520 lis3lv02d_joystick_poll(lis3->idev);
521
522 return IRQ_HANDLED;
523 }
524
525 static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data)
526 {
527 struct lis3lv02d *lis3 = data;
528 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ2_MASK;
529
530 if (irq_cfg == LIS3_IRQ2_CLICK)
531 lis302dl_interrupt_handle_click(lis3);
532 else if (unlikely(irq_cfg == LIS3_IRQ2_DATA_READY))
533 lis302dl_data_ready(lis3, IRQ_LINE1);
534 else
535 lis3lv02d_joystick_poll(lis3->idev);
536
537 return IRQ_HANDLED;
538 }
539
540 static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
541 {
542 struct lis3lv02d *lis3 = container_of(file->private_data,
543 struct lis3lv02d, miscdev);
544
545 if (test_and_set_bit(0, &lis3->misc_opened))
546 return -EBUSY; /* already open */
547
548 if (lis3->pm_dev)
549 pm_runtime_get_sync(lis3->pm_dev);
550
551 atomic_set(&lis3->count, 0);
552 return 0;
553 }
554
555 static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
556 {
557 struct lis3lv02d *lis3 = container_of(file->private_data,
558 struct lis3lv02d, miscdev);
559
560 fasync_helper(-1, file, 0, &lis3->async_queue);
561 clear_bit(0, &lis3->misc_opened); /* release the device */
562 if (lis3->pm_dev)
563 pm_runtime_put(lis3->pm_dev);
564 return 0;
565 }
566
567 static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf,
568 size_t count, loff_t *pos)
569 {
570 struct lis3lv02d *lis3 = container_of(file->private_data,
571 struct lis3lv02d, miscdev);
572
573 DECLARE_WAITQUEUE(wait, current);
574 u32 data;
575 unsigned char byte_data;
576 ssize_t retval = 1;
577
578 if (count < 1)
579 return -EINVAL;
580
581 add_wait_queue(&lis3->misc_wait, &wait);
582 while (true) {
583 set_current_state(TASK_INTERRUPTIBLE);
584 data = atomic_xchg(&lis3->count, 0);
585 if (data)
586 break;
587
588 if (file->f_flags & O_NONBLOCK) {
589 retval = -EAGAIN;
590 goto out;
591 }
592
593 if (signal_pending(current)) {
594 retval = -ERESTARTSYS;
595 goto out;
596 }
597
598 schedule();
599 }
600
601 if (data < 255)
602 byte_data = data;
603 else
604 byte_data = 255;
605
606 /* make sure we are not going into copy_to_user() with
607 * TASK_INTERRUPTIBLE state */
608 set_current_state(TASK_RUNNING);
609 if (copy_to_user(buf, &byte_data, sizeof(byte_data)))
610 retval = -EFAULT;
611
612 out:
613 __set_current_state(TASK_RUNNING);
614 remove_wait_queue(&lis3->misc_wait, &wait);
615
616 return retval;
617 }
618
619 static unsigned int lis3lv02d_misc_poll(struct file *file, poll_table *wait)
620 {
621 struct lis3lv02d *lis3 = container_of(file->private_data,
622 struct lis3lv02d, miscdev);
623
624 poll_wait(file, &lis3->misc_wait, wait);
625 if (atomic_read(&lis3->count))
626 return POLLIN | POLLRDNORM;
627 return 0;
628 }
629
630 static int lis3lv02d_misc_fasync(int fd, struct file *file, int on)
631 {
632 struct lis3lv02d *lis3 = container_of(file->private_data,
633 struct lis3lv02d, miscdev);
634
635 return fasync_helper(fd, file, on, &lis3->async_queue);
636 }
637
638 static const struct file_operations lis3lv02d_misc_fops = {
639 .owner = THIS_MODULE,
640 .llseek = no_llseek,
641 .read = lis3lv02d_misc_read,
642 .open = lis3lv02d_misc_open,
643 .release = lis3lv02d_misc_release,
644 .poll = lis3lv02d_misc_poll,
645 .fasync = lis3lv02d_misc_fasync,
646 };
647
648 int lis3lv02d_joystick_enable(struct lis3lv02d *lis3)
649 {
650 struct input_dev *input_dev;
651 int err;
652 int max_val, fuzz, flat;
653 int btns[] = {BTN_X, BTN_Y, BTN_Z};
654
655 if (lis3->idev)
656 return -EINVAL;
657
658 lis3->idev = input_allocate_polled_device();
659 if (!lis3->idev)
660 return -ENOMEM;
661
662 lis3->idev->poll = lis3lv02d_joystick_poll;
663 lis3->idev->open = lis3lv02d_joystick_open;
664 lis3->idev->close = lis3lv02d_joystick_close;
665 lis3->idev->poll_interval = MDPS_POLL_INTERVAL;
666 lis3->idev->poll_interval_min = MDPS_POLL_MIN;
667 lis3->idev->poll_interval_max = MDPS_POLL_MAX;
668 lis3->idev->private = lis3;
669 input_dev = lis3->idev->input;
670
671 input_dev->name = "ST LIS3LV02DL Accelerometer";
672 input_dev->phys = DRIVER_NAME "/input0";
673 input_dev->id.bustype = BUS_HOST;
674 input_dev->id.vendor = 0;
675 input_dev->dev.parent = &lis3->pdev->dev;
676
677 set_bit(EV_ABS, input_dev->evbit);
678 max_val = (lis3->mdps_max_val * lis3->scale) / LIS3_ACCURACY;
679 if (lis3->whoami == WAI_12B) {
680 fuzz = LIS3_DEFAULT_FUZZ_12B;
681 flat = LIS3_DEFAULT_FLAT_12B;
682 } else {
683 fuzz = LIS3_DEFAULT_FUZZ_8B;
684 flat = LIS3_DEFAULT_FLAT_8B;
685 }
686 fuzz = (fuzz * lis3->scale) / LIS3_ACCURACY;
687 flat = (flat * lis3->scale) / LIS3_ACCURACY;
688
689 input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat);
690 input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat);
691 input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat);
692
693 lis3->mapped_btns[0] = lis3lv02d_get_axis(abs(lis3->ac.x), btns);
694 lis3->mapped_btns[1] = lis3lv02d_get_axis(abs(lis3->ac.y), btns);
695 lis3->mapped_btns[2] = lis3lv02d_get_axis(abs(lis3->ac.z), btns);
696
697 err = input_register_polled_device(lis3->idev);
698 if (err) {
699 input_free_polled_device(lis3->idev);
700 lis3->idev = NULL;
701 }
702
703 return err;
704 }
705 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
706
707 void lis3lv02d_joystick_disable(struct lis3lv02d *lis3)
708 {
709 if (lis3->irq)
710 free_irq(lis3->irq, lis3);
711 if (lis3->pdata && lis3->pdata->irq2)
712 free_irq(lis3->pdata->irq2, lis3);
713
714 if (!lis3->idev)
715 return;
716
717 if (lis3->irq)
718 misc_deregister(&lis3->miscdev);
719 input_unregister_polled_device(lis3->idev);
720 input_free_polled_device(lis3->idev);
721 lis3->idev = NULL;
722 }
723 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
724
725 /* Sysfs stuff */
726 static void lis3lv02d_sysfs_poweron(struct lis3lv02d *lis3)
727 {
728 /*
729 * SYSFS functions are fast visitors so put-call
730 * immediately after the get-call. However, keep
731 * chip running for a while and schedule delayed
732 * suspend. This way periodic sysfs calls doesn't
733 * suffer from relatively long power up time.
734 */
735
736 if (lis3->pm_dev) {
737 pm_runtime_get_sync(lis3->pm_dev);
738 pm_runtime_put_noidle(lis3->pm_dev);
739 pm_schedule_suspend(lis3->pm_dev, LIS3_SYSFS_POWERDOWN_DELAY);
740 }
741 }
742
743 static ssize_t lis3lv02d_selftest_show(struct device *dev,
744 struct device_attribute *attr, char *buf)
745 {
746 struct lis3lv02d *lis3 = dev_get_drvdata(dev);
747 s16 values[3];
748
749 static const char ok[] = "OK";
750 static const char fail[] = "FAIL";
751 static const char irq[] = "FAIL_IRQ";
752 const char *res;
753
754 lis3lv02d_sysfs_poweron(lis3);
755 switch (lis3lv02d_selftest(lis3, values)) {
756 case SELFTEST_FAIL:
757 res = fail;
758 break;
759 case SELFTEST_IRQ:
760 res = irq;
761 break;
762 case SELFTEST_OK:
763 default:
764 res = ok;
765 break;
766 }
767 return sprintf(buf, "%s %d %d %d\n", res,
768 values[0], values[1], values[2]);
769 }
770
771 static ssize_t lis3lv02d_position_show(struct device *dev,
772 struct device_attribute *attr, char *buf)
773 {
774 struct lis3lv02d *lis3 = dev_get_drvdata(dev);
775 int x, y, z;
776
777 lis3lv02d_sysfs_poweron(lis3);
778 mutex_lock(&lis3->mutex);
779 lis3lv02d_get_xyz(lis3, &x, &y, &z);
780 mutex_unlock(&lis3->mutex);
781 return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
782 }
783
784 static ssize_t lis3lv02d_rate_show(struct device *dev,
785 struct device_attribute *attr, char *buf)
786 {
787 struct lis3lv02d *lis3 = dev_get_drvdata(dev);
788
789 lis3lv02d_sysfs_poweron(lis3);
790 return sprintf(buf, "%d\n", lis3lv02d_get_odr(lis3));
791 }
792
793 static ssize_t lis3lv02d_rate_set(struct device *dev,
794 struct device_attribute *attr, const char *buf,
795 size_t count)
796 {
797 struct lis3lv02d *lis3 = dev_get_drvdata(dev);
798 unsigned long rate;
799
800 if (strict_strtoul(buf, 0, &rate))
801 return -EINVAL;
802
803 lis3lv02d_sysfs_poweron(lis3);
804 if (lis3lv02d_set_odr(lis3, rate))
805 return -EINVAL;
806
807 return count;
808 }
809
810 static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL);
811 static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
812 static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show,
813 lis3lv02d_rate_set);
814
815 static struct attribute *lis3lv02d_attributes[] = {
816 &dev_attr_selftest.attr,
817 &dev_attr_position.attr,
818 &dev_attr_rate.attr,
819 NULL
820 };
821
822 static struct attribute_group lis3lv02d_attribute_group = {
823 .attrs = lis3lv02d_attributes
824 };
825
826
827 static int lis3lv02d_add_fs(struct lis3lv02d *lis3)
828 {
829 lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
830 if (IS_ERR(lis3->pdev))
831 return PTR_ERR(lis3->pdev);
832
833 platform_set_drvdata(lis3->pdev, lis3);
834 return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
835 }
836
837 int lis3lv02d_remove_fs(struct lis3lv02d *lis3)
838 {
839 sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
840 platform_device_unregister(lis3->pdev);
841 if (lis3->pm_dev) {
842 /* Barrier after the sysfs remove */
843 pm_runtime_barrier(lis3->pm_dev);
844
845 /* SYSFS may have left chip running. Turn off if necessary */
846 if (!pm_runtime_suspended(lis3->pm_dev))
847 lis3lv02d_poweroff(lis3);
848
849 pm_runtime_disable(lis3->pm_dev);
850 pm_runtime_set_suspended(lis3->pm_dev);
851 }
852 kfree(lis3->reg_cache);
853 return 0;
854 }
855 EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
856
857 static void lis3lv02d_8b_configure(struct lis3lv02d *lis3,
858 struct lis3lv02d_platform_data *p)
859 {
860 int err;
861 int ctrl2 = p->hipass_ctrl;
862
863 if (p->click_flags) {
864 lis3->write(lis3, CLICK_CFG, p->click_flags);
865 lis3->write(lis3, CLICK_TIMELIMIT, p->click_time_limit);
866 lis3->write(lis3, CLICK_LATENCY, p->click_latency);
867 lis3->write(lis3, CLICK_WINDOW, p->click_window);
868 lis3->write(lis3, CLICK_THSZ, p->click_thresh_z & 0xf);
869 lis3->write(lis3, CLICK_THSY_X,
870 (p->click_thresh_x & 0xf) |
871 (p->click_thresh_y << 4));
872
873 if (lis3->idev) {
874 struct input_dev *input_dev = lis3->idev->input;
875 input_set_capability(input_dev, EV_KEY, BTN_X);
876 input_set_capability(input_dev, EV_KEY, BTN_Y);
877 input_set_capability(input_dev, EV_KEY, BTN_Z);
878 }
879 }
880
881 if (p->wakeup_flags) {
882 lis3->write(lis3, FF_WU_CFG_1, p->wakeup_flags);
883 lis3->write(lis3, FF_WU_THS_1, p->wakeup_thresh & 0x7f);
884 /* pdata value + 1 to keep this backward compatible*/
885 lis3->write(lis3, FF_WU_DURATION_1, p->duration1 + 1);
886 ctrl2 ^= HP_FF_WU1; /* Xor to keep compatible with old pdata*/
887 }
888
889 if (p->wakeup_flags2) {
890 lis3->write(lis3, FF_WU_CFG_2, p->wakeup_flags2);
891 lis3->write(lis3, FF_WU_THS_2, p->wakeup_thresh2 & 0x7f);
892 /* pdata value + 1 to keep this backward compatible*/
893 lis3->write(lis3, FF_WU_DURATION_2, p->duration2 + 1);
894 ctrl2 ^= HP_FF_WU2; /* Xor to keep compatible with old pdata*/
895 }
896 /* Configure hipass filters */
897 lis3->write(lis3, CTRL_REG2, ctrl2);
898
899 if (p->irq2) {
900 err = request_threaded_irq(p->irq2,
901 NULL,
902 lis302dl_interrupt_thread2_8b,
903 IRQF_TRIGGER_RISING | IRQF_ONESHOT |
904 (p->irq_flags2 & IRQF_TRIGGER_MASK),
905 DRIVER_NAME, lis3);
906 if (err < 0)
907 pr_err("No second IRQ. Limited functionality\n");
908 }
909 }
910
911 /*
912 * Initialise the accelerometer and the various subsystems.
913 * Should be rather independent of the bus system.
914 */
915 int lis3lv02d_init_device(struct lis3lv02d *lis3)
916 {
917 int err;
918 irq_handler_t thread_fn;
919 int irq_flags = 0;
920
921 lis3->whoami = lis3lv02d_read_8(lis3, WHO_AM_I);
922
923 switch (lis3->whoami) {
924 case WAI_12B:
925 pr_info("12 bits sensor found\n");
926 lis3->read_data = lis3lv02d_read_12;
927 lis3->mdps_max_val = 2048;
928 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_12B;
929 lis3->odrs = lis3_12_rates;
930 lis3->odr_mask = CTRL1_DF0 | CTRL1_DF1;
931 lis3->scale = LIS3_SENSITIVITY_12B;
932 lis3->regs = lis3_wai12_regs;
933 lis3->regs_size = ARRAY_SIZE(lis3_wai12_regs);
934 break;
935 case WAI_8B:
936 pr_info("8 bits sensor found\n");
937 lis3->read_data = lis3lv02d_read_8;
938 lis3->mdps_max_val = 128;
939 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
940 lis3->odrs = lis3_8_rates;
941 lis3->odr_mask = CTRL1_DR;
942 lis3->scale = LIS3_SENSITIVITY_8B;
943 lis3->regs = lis3_wai8_regs;
944 lis3->regs_size = ARRAY_SIZE(lis3_wai8_regs);
945 break;
946 case WAI_3DC:
947 pr_info("8 bits 3DC sensor found\n");
948 lis3->read_data = lis3lv02d_read_8;
949 lis3->mdps_max_val = 128;
950 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
951 lis3->odrs = lis3_3dc_rates;
952 lis3->odr_mask = CTRL1_ODR0|CTRL1_ODR1|CTRL1_ODR2|CTRL1_ODR3;
953 lis3->scale = LIS3_SENSITIVITY_8B;
954 break;
955 default:
956 pr_err("unknown sensor type 0x%X\n", lis3->whoami);
957 return -EINVAL;
958 }
959
960 lis3->reg_cache = kzalloc(max(sizeof(lis3_wai8_regs),
961 sizeof(lis3_wai12_regs)), GFP_KERNEL);
962
963 if (lis3->reg_cache == NULL) {
964 printk(KERN_ERR DRIVER_NAME "out of memory\n");
965 return -ENOMEM;
966 }
967
968 mutex_init(&lis3->mutex);
969 atomic_set(&lis3->wake_thread, 0);
970
971 lis3lv02d_add_fs(lis3);
972 err = lis3lv02d_poweron(lis3);
973 if (err) {
974 lis3lv02d_remove_fs(lis3);
975 return err;
976 }
977
978 if (lis3->pm_dev) {
979 pm_runtime_set_active(lis3->pm_dev);
980 pm_runtime_enable(lis3->pm_dev);
981 }
982
983 if (lis3lv02d_joystick_enable(lis3))
984 pr_err("joystick initialization failed\n");
985
986 /* passing in platform specific data is purely optional and only
987 * used by the SPI transport layer at the moment */
988 if (lis3->pdata) {
989 struct lis3lv02d_platform_data *p = lis3->pdata;
990
991 if (lis3->whoami == WAI_8B)
992 lis3lv02d_8b_configure(lis3, p);
993
994 irq_flags = p->irq_flags1 & IRQF_TRIGGER_MASK;
995
996 lis3->irq_cfg = p->irq_cfg;
997 if (p->irq_cfg)
998 lis3->write(lis3, CTRL_REG3, p->irq_cfg);
999
1000 if (p->default_rate)
1001 lis3lv02d_set_odr(lis3, p->default_rate);
1002 }
1003
1004 /* bail if we did not get an IRQ from the bus layer */
1005 if (!lis3->irq) {
1006 pr_debug("No IRQ. Disabling /dev/freefall\n");
1007 goto out;
1008 }
1009
1010 /*
1011 * The sensor can generate interrupts for free-fall and direction
1012 * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep
1013 * the things simple and _fast_ we activate it only for free-fall, so
1014 * no need to read register (very slow with ACPI). For the same reason,
1015 * we forbid shared interrupts.
1016 *
1017 * IRQF_TRIGGER_RISING seems pointless on HP laptops because the
1018 * io-apic is not configurable (and generates a warning) but I keep it
1019 * in case of support for other hardware.
1020 */
1021 if (lis3->pdata && lis3->whoami == WAI_8B)
1022 thread_fn = lis302dl_interrupt_thread1_8b;
1023 else
1024 thread_fn = NULL;
1025
1026 err = request_threaded_irq(lis3->irq, lis302dl_interrupt,
1027 thread_fn,
1028 IRQF_TRIGGER_RISING | IRQF_ONESHOT |
1029 irq_flags,
1030 DRIVER_NAME, lis3);
1031
1032 if (err < 0) {
1033 pr_err("Cannot get IRQ\n");
1034 goto out;
1035 }
1036
1037 lis3->miscdev.minor = MISC_DYNAMIC_MINOR;
1038 lis3->miscdev.name = "freefall";
1039 lis3->miscdev.fops = &lis3lv02d_misc_fops;
1040
1041 if (misc_register(&lis3->miscdev))
1042 pr_err("misc_register failed\n");
1043 out:
1044 return 0;
1045 }
1046 EXPORT_SYMBOL_GPL(lis3lv02d_init_device);
1047
1048 MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
1049 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
1050 MODULE_LICENSE("GPL");
linux-next