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bonding: fix rx_handler locking
[linux/fpc-iii.git] / drivers / hwmon / lis3lv02d.c
blobd805e8e579671d4218a9e1517a487aca1daed761
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 <asm/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
92 EXPORT_SYMBOL_GPL(lis3_dev);
93
94 /* just like param_set_int() but does sanity-check so that it won't point
95 * over the axis array size
96 */
97 static int param_set_axis(const char *val, const struct kernel_param *kp)
98 {
99 int ret = param_set_int(val, kp);
100 if (!ret) {
101 int val = *(int *)kp->arg;
102 if (val < 0)
103 val = -val;
104 if (!val || val > 3)
105 return -EINVAL;
106 }
107 return ret;
108 }
109
110 static struct kernel_param_ops param_ops_axis = {
111 .set = param_set_axis,
112 .get = param_get_int,
113 };
114
115 module_param_array_named(axes, lis3_dev.ac.as_array, axis, NULL, 0644);
116 MODULE_PARM_DESC(axes, "Axis-mapping for x,y,z directions");
117
118 static s16 lis3lv02d_read_8(struct lis3lv02d *lis3, int reg)
119 {
120 s8 lo;
121 if (lis3->read(lis3, reg, &lo) < 0)
122 return 0;
123
124 return lo;
125 }
126
127 static s16 lis3lv02d_read_12(struct lis3lv02d *lis3, int reg)
128 {
129 u8 lo, hi;
130
131 lis3->read(lis3, reg - 1, &lo);
132 lis3->read(lis3, reg, &hi);
133 /* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */
134 return (s16)((hi << 8) | lo);
135 }
136
137 /**
138 * lis3lv02d_get_axis - For the given axis, give the value converted
139 * @axis: 1,2,3 - can also be negative
140 * @hw_values: raw values returned by the hardware
141 *
142 * Returns the converted value.
143 */
144 static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3])
145 {
146 if (axis > 0)
147 return hw_values[axis - 1];
148 else
149 return -hw_values[-axis - 1];
150 }
151
152 /**
153 * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer
154 * @lis3: pointer to the device struct
155 * @x: where to store the X axis value
156 * @y: where to store the Y axis value
157 * @z: where to store the Z axis value
158 *
159 * Note that 40Hz input device can eat up about 10% CPU at 800MHZ
160 */
161 static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z)
162 {
163 int position[3];
164 int i;
165
166 if (lis3->blkread) {
167 if (lis3_dev.whoami == WAI_12B) {
168 u16 data[3];
169 lis3->blkread(lis3, OUTX_L, 6, (u8 *)data);
170 for (i = 0; i < 3; i++)
171 position[i] = (s16)le16_to_cpu(data[i]);
172 } else {
173 u8 data[5];
174 /* Data: x, dummy, y, dummy, z */
175 lis3->blkread(lis3, OUTX, 5, data);
176 for (i = 0; i < 3; i++)
177 position[i] = (s8)data[i * 2];
178 }
179 } else {
180 position[0] = lis3->read_data(lis3, OUTX);
181 position[1] = lis3->read_data(lis3, OUTY);
182 position[2] = lis3->read_data(lis3, OUTZ);
183 }
184
185 for (i = 0; i < 3; i++)
186 position[i] = (position[i] * lis3->scale) / LIS3_ACCURACY;
187
188 *x = lis3lv02d_get_axis(lis3->ac.x, position);
189 *y = lis3lv02d_get_axis(lis3->ac.y, position);
190 *z = lis3lv02d_get_axis(lis3->ac.z, position);
191 }
192
193 /* conversion btw sampling rate and the register values */
194 static int lis3_12_rates[4] = {40, 160, 640, 2560};
195 static int lis3_8_rates[2] = {100, 400};
196 static int lis3_3dc_rates[16] = {0, 1, 10, 25, 50, 100, 200, 400, 1600, 5000};
197
198 /* ODR is Output Data Rate */
199 static int lis3lv02d_get_odr(void)
200 {
201 u8 ctrl;
202 int shift;
203
204 lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl);
205 ctrl &= lis3_dev.odr_mask;
206 shift = ffs(lis3_dev.odr_mask) - 1;
207 return lis3_dev.odrs[(ctrl >> shift)];
208 }
209
210 static int lis3lv02d_set_odr(int rate)
211 {
212 u8 ctrl;
213 int i, len, shift;
214
215 if (!rate)
216 return -EINVAL;
217
218 lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl);
219 ctrl &= ~lis3_dev.odr_mask;
220 len = 1 << hweight_long(lis3_dev.odr_mask); /* # of possible values */
221 shift = ffs(lis3_dev.odr_mask) - 1;
222
223 for (i = 0; i < len; i++)
224 if (lis3_dev.odrs[i] == rate) {
225 lis3_dev.write(&lis3_dev, CTRL_REG1,
226 ctrl | (i << shift));
227 return 0;
228 }
229 return -EINVAL;
230 }
231
232 static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
233 {
234 u8 ctlreg, reg;
235 s16 x, y, z;
236 u8 selftest;
237 int ret;
238 u8 ctrl_reg_data;
239 unsigned char irq_cfg;
240
241 mutex_lock(&lis3->mutex);
242
243 irq_cfg = lis3->irq_cfg;
244 if (lis3_dev.whoami == WAI_8B) {
245 lis3->data_ready_count[IRQ_LINE0] = 0;
246 lis3->data_ready_count[IRQ_LINE1] = 0;
247
248 /* Change interrupt cfg to data ready for selftest */
249 atomic_inc(&lis3_dev.wake_thread);
250 lis3->irq_cfg = LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY;
251 lis3->read(lis3, CTRL_REG3, &ctrl_reg_data);
252 lis3->write(lis3, CTRL_REG3, (ctrl_reg_data &
253 ~(LIS3_IRQ1_MASK | LIS3_IRQ2_MASK)) |
254 (LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY));
255 }
256
257 if (lis3_dev.whoami == WAI_3DC) {
258 ctlreg = CTRL_REG4;
259 selftest = CTRL4_ST0;
260 } else {
261 ctlreg = CTRL_REG1;
262 if (lis3_dev.whoami == WAI_12B)
263 selftest = CTRL1_ST;
264 else
265 selftest = CTRL1_STP;
266 }
267
268 lis3->read(lis3, ctlreg, &reg);
269 lis3->write(lis3, ctlreg, (reg | selftest));
270 msleep(lis3->pwron_delay / lis3lv02d_get_odr());
271
272 /* Read directly to avoid axis remap */
273 x = lis3->read_data(lis3, OUTX);
274 y = lis3->read_data(lis3, OUTY);
275 z = lis3->read_data(lis3, OUTZ);
276
277 /* back to normal settings */
278 lis3->write(lis3, ctlreg, reg);
279 msleep(lis3->pwron_delay / lis3lv02d_get_odr());
280
281 results[0] = x - lis3->read_data(lis3, OUTX);
282 results[1] = y - lis3->read_data(lis3, OUTY);
283 results[2] = z - lis3->read_data(lis3, OUTZ);
284
285 ret = 0;
286
287 if (lis3_dev.whoami == WAI_8B) {
288 /* Restore original interrupt configuration */
289 atomic_dec(&lis3_dev.wake_thread);
290 lis3->write(lis3, CTRL_REG3, ctrl_reg_data);
291 lis3->irq_cfg = irq_cfg;
292
293 if ((irq_cfg & LIS3_IRQ1_MASK) &&
294 lis3->data_ready_count[IRQ_LINE0] < 2) {
295 ret = SELFTEST_IRQ;
296 goto fail;
297 }
298
299 if ((irq_cfg & LIS3_IRQ2_MASK) &&
300 lis3->data_ready_count[IRQ_LINE1] < 2) {
301 ret = SELFTEST_IRQ;
302 goto fail;
303 }
304 }
305
306 if (lis3->pdata) {
307 int i;
308 for (i = 0; i < 3; i++) {
309 /* Check against selftest acceptance limits */
310 if ((results[i] < lis3->pdata->st_min_limits[i]) ||
311 (results[i] > lis3->pdata->st_max_limits[i])) {
312 ret = SELFTEST_FAIL;
313 goto fail;
314 }
315 }
316 }
317
318 /* test passed */
319 fail:
320 mutex_unlock(&lis3->mutex);
321 return ret;
322 }
323
324 /*
325 * Order of registers in the list affects to order of the restore process.
326 * Perhaps it is a good idea to set interrupt enable register as a last one
327 * after all other configurations
328 */
329 static u8 lis3_wai8_regs[] = { FF_WU_CFG_1, FF_WU_THS_1, FF_WU_DURATION_1,
330 FF_WU_CFG_2, FF_WU_THS_2, FF_WU_DURATION_2,
331 CLICK_CFG, CLICK_SRC, CLICK_THSY_X, CLICK_THSZ,
332 CLICK_TIMELIMIT, CLICK_LATENCY, CLICK_WINDOW,
333 CTRL_REG1, CTRL_REG2, CTRL_REG3};
334
335 static u8 lis3_wai12_regs[] = {FF_WU_CFG, FF_WU_THS_L, FF_WU_THS_H,
336 FF_WU_DURATION, DD_CFG, DD_THSI_L, DD_THSI_H,
337 DD_THSE_L, DD_THSE_H,
338 CTRL_REG1, CTRL_REG3, CTRL_REG2};
339
340 static inline void lis3_context_save(struct lis3lv02d *lis3)
341 {
342 int i;
343 for (i = 0; i < lis3->regs_size; i++)
344 lis3->read(lis3, lis3->regs[i], &lis3->reg_cache[i]);
345 lis3->regs_stored = true;
346 }
347
348 static inline void lis3_context_restore(struct lis3lv02d *lis3)
349 {
350 int i;
351 if (lis3->regs_stored)
352 for (i = 0; i < lis3->regs_size; i++)
353 lis3->write(lis3, lis3->regs[i], lis3->reg_cache[i]);
354 }
355
356 void lis3lv02d_poweroff(struct lis3lv02d *lis3)
357 {
358 if (lis3->reg_ctrl)
359 lis3_context_save(lis3);
360 /* disable X,Y,Z axis and power down */
361 lis3->write(lis3, CTRL_REG1, 0x00);
362 if (lis3->reg_ctrl)
363 lis3->reg_ctrl(lis3, LIS3_REG_OFF);
364 }
365 EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);
366
367 void lis3lv02d_poweron(struct lis3lv02d *lis3)
368 {
369 u8 reg;
370
371 lis3->init(lis3);
372
373 /*
374 * Common configuration
375 * BDU: (12 bits sensors only) LSB and MSB values are not updated until
376 * both have been read. So the value read will always be correct.
377 * Set BOOT bit to refresh factory tuning values.
378 */
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 /* LIS3 power on delay is quite long */
387 msleep(lis3->pwron_delay / lis3lv02d_get_odr());
388
389 if (lis3->reg_ctrl)
390 lis3_context_restore(lis3);
391 }
392 EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
393
394
395 static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev)
396 {
397 int x, y, z;
398
399 mutex_lock(&lis3_dev.mutex);
400 lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
401 input_report_abs(pidev->input, ABS_X, x);
402 input_report_abs(pidev->input, ABS_Y, y);
403 input_report_abs(pidev->input, ABS_Z, z);
404 input_sync(pidev->input);
405 mutex_unlock(&lis3_dev.mutex);
406 }
407
408 static void lis3lv02d_joystick_open(struct input_polled_dev *pidev)
409 {
410 if (lis3_dev.pm_dev)
411 pm_runtime_get_sync(lis3_dev.pm_dev);
412
413 if (lis3_dev.pdata && lis3_dev.whoami == WAI_8B && lis3_dev.idev)
414 atomic_set(&lis3_dev.wake_thread, 1);
415 /*
416 * Update coordinates for the case where poll interval is 0 and
417 * the chip in running purely under interrupt control
418 */
419 lis3lv02d_joystick_poll(pidev);
420 }
421
422 static void lis3lv02d_joystick_close(struct input_polled_dev *pidev)
423 {
424 atomic_set(&lis3_dev.wake_thread, 0);
425 if (lis3_dev.pm_dev)
426 pm_runtime_put(lis3_dev.pm_dev);
427 }
428
429 static irqreturn_t lis302dl_interrupt(int irq, void *dummy)
430 {
431 if (!test_bit(0, &lis3_dev.misc_opened))
432 goto out;
433
434 /*
435 * Be careful: on some HP laptops the bios force DD when on battery and
436 * the lid is closed. This leads to interrupts as soon as a little move
437 * is done.
438 */
439 atomic_inc(&lis3_dev.count);
440
441 wake_up_interruptible(&lis3_dev.misc_wait);
442 kill_fasync(&lis3_dev.async_queue, SIGIO, POLL_IN);
443 out:
444 if (atomic_read(&lis3_dev.wake_thread))
445 return IRQ_WAKE_THREAD;
446 return IRQ_HANDLED;
447 }
448
449 static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3)
450 {
451 struct input_dev *dev = lis3->idev->input;
452 u8 click_src;
453
454 mutex_lock(&lis3->mutex);
455 lis3->read(lis3, CLICK_SRC, &click_src);
456
457 if (click_src & CLICK_SINGLE_X) {
458 input_report_key(dev, lis3->mapped_btns[0], 1);
459 input_report_key(dev, lis3->mapped_btns[0], 0);
460 }
461
462 if (click_src & CLICK_SINGLE_Y) {
463 input_report_key(dev, lis3->mapped_btns[1], 1);
464 input_report_key(dev, lis3->mapped_btns[1], 0);
465 }
466
467 if (click_src & CLICK_SINGLE_Z) {
468 input_report_key(dev, lis3->mapped_btns[2], 1);
469 input_report_key(dev, lis3->mapped_btns[2], 0);
470 }
471 input_sync(dev);
472 mutex_unlock(&lis3->mutex);
473 }
474
475 static inline void lis302dl_data_ready(struct lis3lv02d *lis3, int index)
476 {
477 int dummy;
478
479 /* Dummy read to ack interrupt */
480 lis3lv02d_get_xyz(lis3, &dummy, &dummy, &dummy);
481 lis3->data_ready_count[index]++;
482 }
483
484 static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data)
485 {
486 struct lis3lv02d *lis3 = data;
487 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ1_MASK;
488
489 if (irq_cfg == LIS3_IRQ1_CLICK)
490 lis302dl_interrupt_handle_click(lis3);
491 else if (unlikely(irq_cfg == LIS3_IRQ1_DATA_READY))
492 lis302dl_data_ready(lis3, IRQ_LINE0);
493 else
494 lis3lv02d_joystick_poll(lis3->idev);
495
496 return IRQ_HANDLED;
497 }
498
499 static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data)
500 {
501 struct lis3lv02d *lis3 = data;
502 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ2_MASK;
503
504 if (irq_cfg == LIS3_IRQ2_CLICK)
505 lis302dl_interrupt_handle_click(lis3);
506 else if (unlikely(irq_cfg == LIS3_IRQ2_DATA_READY))
507 lis302dl_data_ready(lis3, IRQ_LINE1);
508 else
509 lis3lv02d_joystick_poll(lis3->idev);
510
511 return IRQ_HANDLED;
512 }
513
514 static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
515 {
516 if (test_and_set_bit(0, &lis3_dev.misc_opened))
517 return -EBUSY; /* already open */
518
519 if (lis3_dev.pm_dev)
520 pm_runtime_get_sync(lis3_dev.pm_dev);
521
522 atomic_set(&lis3_dev.count, 0);
523 return 0;
524 }
525
526 static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
527 {
528 fasync_helper(-1, file, 0, &lis3_dev.async_queue);
529 clear_bit(0, &lis3_dev.misc_opened); /* release the device */
530 if (lis3_dev.pm_dev)
531 pm_runtime_put(lis3_dev.pm_dev);
532 return 0;
533 }
534
535 static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf,
536 size_t count, loff_t *pos)
537 {
538 DECLARE_WAITQUEUE(wait, current);
539 u32 data;
540 unsigned char byte_data;
541 ssize_t retval = 1;
542
543 if (count < 1)
544 return -EINVAL;
545
546 add_wait_queue(&lis3_dev.misc_wait, &wait);
547 while (true) {
548 set_current_state(TASK_INTERRUPTIBLE);
549 data = atomic_xchg(&lis3_dev.count, 0);
550 if (data)
551 break;
552
553 if (file->f_flags & O_NONBLOCK) {
554 retval = -EAGAIN;
555 goto out;
556 }
557
558 if (signal_pending(current)) {
559 retval = -ERESTARTSYS;
560 goto out;
561 }
562
563 schedule();
564 }
565
566 if (data < 255)
567 byte_data = data;
568 else
569 byte_data = 255;
570
571 /* make sure we are not going into copy_to_user() with
572 * TASK_INTERRUPTIBLE state */
573 set_current_state(TASK_RUNNING);
574 if (copy_to_user(buf, &byte_data, sizeof(byte_data)))
575 retval = -EFAULT;
576
577 out:
578 __set_current_state(TASK_RUNNING);
579 remove_wait_queue(&lis3_dev.misc_wait, &wait);
580
581 return retval;
582 }
583
584 static unsigned int lis3lv02d_misc_poll(struct file *file, poll_table *wait)
585 {
586 poll_wait(file, &lis3_dev.misc_wait, wait);
587 if (atomic_read(&lis3_dev.count))
588 return POLLIN | POLLRDNORM;
589 return 0;
590 }
591
592 static int lis3lv02d_misc_fasync(int fd, struct file *file, int on)
593 {
594 return fasync_helper(fd, file, on, &lis3_dev.async_queue);
595 }
596
597 static const struct file_operations lis3lv02d_misc_fops = {
598 .owner = THIS_MODULE,
599 .llseek = no_llseek,
600 .read = lis3lv02d_misc_read,
601 .open = lis3lv02d_misc_open,
602 .release = lis3lv02d_misc_release,
603 .poll = lis3lv02d_misc_poll,
604 .fasync = lis3lv02d_misc_fasync,
605 };
606
607 static struct miscdevice lis3lv02d_misc_device = {
608 .minor = MISC_DYNAMIC_MINOR,
609 .name = "freefall",
610 .fops = &lis3lv02d_misc_fops,
611 };
612
613 int lis3lv02d_joystick_enable(void)
614 {
615 struct input_dev *input_dev;
616 int err;
617 int max_val, fuzz, flat;
618 int btns[] = {BTN_X, BTN_Y, BTN_Z};
619
620 if (lis3_dev.idev)
621 return -EINVAL;
622
623 lis3_dev.idev = input_allocate_polled_device();
624 if (!lis3_dev.idev)
625 return -ENOMEM;
626
627 lis3_dev.idev->poll = lis3lv02d_joystick_poll;
628 lis3_dev.idev->open = lis3lv02d_joystick_open;
629 lis3_dev.idev->close = lis3lv02d_joystick_close;
630 lis3_dev.idev->poll_interval = MDPS_POLL_INTERVAL;
631 lis3_dev.idev->poll_interval_min = MDPS_POLL_MIN;
632 lis3_dev.idev->poll_interval_max = MDPS_POLL_MAX;
633 input_dev = lis3_dev.idev->input;
634
635 input_dev->name = "ST LIS3LV02DL Accelerometer";
636 input_dev->phys = DRIVER_NAME "/input0";
637 input_dev->id.bustype = BUS_HOST;
638 input_dev->id.vendor = 0;
639 input_dev->dev.parent = &lis3_dev.pdev->dev;
640
641 set_bit(EV_ABS, input_dev->evbit);
642 max_val = (lis3_dev.mdps_max_val * lis3_dev.scale) / LIS3_ACCURACY;
643 if (lis3_dev.whoami == WAI_12B) {
644 fuzz = LIS3_DEFAULT_FUZZ_12B;
645 flat = LIS3_DEFAULT_FLAT_12B;
646 } else {
647 fuzz = LIS3_DEFAULT_FUZZ_8B;
648 flat = LIS3_DEFAULT_FLAT_8B;
649 }
650 fuzz = (fuzz * lis3_dev.scale) / LIS3_ACCURACY;
651 flat = (flat * lis3_dev.scale) / LIS3_ACCURACY;
652
653 input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat);
654 input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat);
655 input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat);
656
657 lis3_dev.mapped_btns[0] = lis3lv02d_get_axis(abs(lis3_dev.ac.x), btns);
658 lis3_dev.mapped_btns[1] = lis3lv02d_get_axis(abs(lis3_dev.ac.y), btns);
659 lis3_dev.mapped_btns[2] = lis3lv02d_get_axis(abs(lis3_dev.ac.z), btns);
660
661 err = input_register_polled_device(lis3_dev.idev);
662 if (err) {
663 input_free_polled_device(lis3_dev.idev);
664 lis3_dev.idev = NULL;
665 }
666
667 return err;
668 }
669 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
670
671 void lis3lv02d_joystick_disable(void)
672 {
673 if (lis3_dev.irq)
674 free_irq(lis3_dev.irq, &lis3_dev);
675 if (lis3_dev.pdata && lis3_dev.pdata->irq2)
676 free_irq(lis3_dev.pdata->irq2, &lis3_dev);
677
678 if (!lis3_dev.idev)
679 return;
680
681 if (lis3_dev.irq)
682 misc_deregister(&lis3lv02d_misc_device);
683 input_unregister_polled_device(lis3_dev.idev);
684 input_free_polled_device(lis3_dev.idev);
685 lis3_dev.idev = NULL;
686 }
687 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
688
689 /* Sysfs stuff */
690 static void lis3lv02d_sysfs_poweron(struct lis3lv02d *lis3)
691 {
692 /*
693 * SYSFS functions are fast visitors so put-call
694 * immediately after the get-call. However, keep
695 * chip running for a while and schedule delayed
696 * suspend. This way periodic sysfs calls doesn't
697 * suffer from relatively long power up time.
698 */
699
700 if (lis3->pm_dev) {
701 pm_runtime_get_sync(lis3->pm_dev);
702 pm_runtime_put_noidle(lis3->pm_dev);
703 pm_schedule_suspend(lis3->pm_dev, LIS3_SYSFS_POWERDOWN_DELAY);
704 }
705 }
706
707 static ssize_t lis3lv02d_selftest_show(struct device *dev,
708 struct device_attribute *attr, char *buf)
709 {
710 s16 values[3];
711
712 static const char ok[] = "OK";
713 static const char fail[] = "FAIL";
714 static const char irq[] = "FAIL_IRQ";
715 const char *res;
716
717 lis3lv02d_sysfs_poweron(&lis3_dev);
718 switch (lis3lv02d_selftest(&lis3_dev, values)) {
719 case SELFTEST_FAIL:
720 res = fail;
721 break;
722 case SELFTEST_IRQ:
723 res = irq;
724 break;
725 case SELFTEST_OK:
726 default:
727 res = ok;
728 break;
729 }
730 return sprintf(buf, "%s %d %d %d\n", res,
731 values[0], values[1], values[2]);
732 }
733
734 static ssize_t lis3lv02d_position_show(struct device *dev,
735 struct device_attribute *attr, char *buf)
736 {
737 int x, y, z;
738
739 lis3lv02d_sysfs_poweron(&lis3_dev);
740 mutex_lock(&lis3_dev.mutex);
741 lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
742 mutex_unlock(&lis3_dev.mutex);
743 return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
744 }
745
746 static ssize_t lis3lv02d_rate_show(struct device *dev,
747 struct device_attribute *attr, char *buf)
748 {
749 lis3lv02d_sysfs_poweron(&lis3_dev);
750 return sprintf(buf, "%d\n", lis3lv02d_get_odr());
751 }
752
753 static ssize_t lis3lv02d_rate_set(struct device *dev,
754 struct device_attribute *attr, const char *buf,
755 size_t count)
756 {
757 unsigned long rate;
758
759 if (strict_strtoul(buf, 0, &rate))
760 return -EINVAL;
761
762 lis3lv02d_sysfs_poweron(&lis3_dev);
763 if (lis3lv02d_set_odr(rate))
764 return -EINVAL;
765
766 return count;
767 }
768
769 static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL);
770 static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
771 static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show,
772 lis3lv02d_rate_set);
773
774 static struct attribute *lis3lv02d_attributes[] = {
775 &dev_attr_selftest.attr,
776 &dev_attr_position.attr,
777 &dev_attr_rate.attr,
778 NULL
779 };
780
781 static struct attribute_group lis3lv02d_attribute_group = {
782 .attrs = lis3lv02d_attributes
783 };
784
785
786 static int lis3lv02d_add_fs(struct lis3lv02d *lis3)
787 {
788 lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
789 if (IS_ERR(lis3->pdev))
790 return PTR_ERR(lis3->pdev);
791
792 return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
793 }
794
795 int lis3lv02d_remove_fs(struct lis3lv02d *lis3)
796 {
797 sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
798 platform_device_unregister(lis3->pdev);
799 if (lis3->pm_dev) {
800 /* Barrier after the sysfs remove */
801 pm_runtime_barrier(lis3->pm_dev);
802
803 /* SYSFS may have left chip running. Turn off if necessary */
804 if (!pm_runtime_suspended(lis3->pm_dev))
805 lis3lv02d_poweroff(&lis3_dev);
806
807 pm_runtime_disable(lis3->pm_dev);
808 pm_runtime_set_suspended(lis3->pm_dev);
809 }
810 kfree(lis3->reg_cache);
811 return 0;
812 }
813 EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
814
815 static void lis3lv02d_8b_configure(struct lis3lv02d *dev,
816 struct lis3lv02d_platform_data *p)
817 {
818 int err;
819 int ctrl2 = p->hipass_ctrl;
820
821 if (p->click_flags) {
822 dev->write(dev, CLICK_CFG, p->click_flags);
823 dev->write(dev, CLICK_TIMELIMIT, p->click_time_limit);
824 dev->write(dev, CLICK_LATENCY, p->click_latency);
825 dev->write(dev, CLICK_WINDOW, p->click_window);
826 dev->write(dev, CLICK_THSZ, p->click_thresh_z & 0xf);
827 dev->write(dev, CLICK_THSY_X,
828 (p->click_thresh_x & 0xf) |
829 (p->click_thresh_y << 4));
830
831 if (dev->idev) {
832 struct input_dev *input_dev = lis3_dev.idev->input;
833 input_set_capability(input_dev, EV_KEY, BTN_X);
834 input_set_capability(input_dev, EV_KEY, BTN_Y);
835 input_set_capability(input_dev, EV_KEY, BTN_Z);
836 }
837 }
838
839 if (p->wakeup_flags) {
840 dev->write(dev, FF_WU_CFG_1, p->wakeup_flags);
841 dev->write(dev, FF_WU_THS_1, p->wakeup_thresh & 0x7f);
842 /* pdata value + 1 to keep this backward compatible*/
843 dev->write(dev, FF_WU_DURATION_1, p->duration1 + 1);
844 ctrl2 ^= HP_FF_WU1; /* Xor to keep compatible with old pdata*/
845 }
846
847 if (p->wakeup_flags2) {
848 dev->write(dev, FF_WU_CFG_2, p->wakeup_flags2);
849 dev->write(dev, FF_WU_THS_2, p->wakeup_thresh2 & 0x7f);
850 /* pdata value + 1 to keep this backward compatible*/
851 dev->write(dev, FF_WU_DURATION_2, p->duration2 + 1);
852 ctrl2 ^= HP_FF_WU2; /* Xor to keep compatible with old pdata*/
853 }
854 /* Configure hipass filters */
855 dev->write(dev, CTRL_REG2, ctrl2);
856
857 if (p->irq2) {
858 err = request_threaded_irq(p->irq2,
859 NULL,
860 lis302dl_interrupt_thread2_8b,
861 IRQF_TRIGGER_RISING | IRQF_ONESHOT |
862 (p->irq_flags2 & IRQF_TRIGGER_MASK),
863 DRIVER_NAME, &lis3_dev);
864 if (err < 0)
865 pr_err("No second IRQ. Limited functionality\n");
866 }
867 }
868
869 /*
870 * Initialise the accelerometer and the various subsystems.
871 * Should be rather independent of the bus system.
872 */
873 int lis3lv02d_init_device(struct lis3lv02d *dev)
874 {
875 int err;
876 irq_handler_t thread_fn;
877 int irq_flags = 0;
878
879 dev->whoami = lis3lv02d_read_8(dev, WHO_AM_I);
880
881 switch (dev->whoami) {
882 case WAI_12B:
883 pr_info("12 bits sensor found\n");
884 dev->read_data = lis3lv02d_read_12;
885 dev->mdps_max_val = 2048;
886 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_12B;
887 dev->odrs = lis3_12_rates;
888 dev->odr_mask = CTRL1_DF0 | CTRL1_DF1;
889 dev->scale = LIS3_SENSITIVITY_12B;
890 dev->regs = lis3_wai12_regs;
891 dev->regs_size = ARRAY_SIZE(lis3_wai12_regs);
892 break;
893 case WAI_8B:
894 pr_info("8 bits sensor found\n");
895 dev->read_data = lis3lv02d_read_8;
896 dev->mdps_max_val = 128;
897 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
898 dev->odrs = lis3_8_rates;
899 dev->odr_mask = CTRL1_DR;
900 dev->scale = LIS3_SENSITIVITY_8B;
901 dev->regs = lis3_wai8_regs;
902 dev->regs_size = ARRAY_SIZE(lis3_wai8_regs);
903 break;
904 case WAI_3DC:
905 pr_info("8 bits 3DC sensor found\n");
906 dev->read_data = lis3lv02d_read_8;
907 dev->mdps_max_val = 128;
908 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
909 dev->odrs = lis3_3dc_rates;
910 dev->odr_mask = CTRL1_ODR0|CTRL1_ODR1|CTRL1_ODR2|CTRL1_ODR3;
911 dev->scale = LIS3_SENSITIVITY_8B;
912 break;
913 default:
914 pr_err("unknown sensor type 0x%X\n", dev->whoami);
915 return -EINVAL;
916 }
917
918 dev->reg_cache = kzalloc(max(sizeof(lis3_wai8_regs),
919 sizeof(lis3_wai12_regs)), GFP_KERNEL);
920
921 if (dev->reg_cache == NULL) {
922 printk(KERN_ERR DRIVER_NAME "out of memory\n");
923 return -ENOMEM;
924 }
925
926 mutex_init(&dev->mutex);
927 atomic_set(&dev->wake_thread, 0);
928
929 lis3lv02d_add_fs(dev);
930 lis3lv02d_poweron(dev);
931
932 if (dev->pm_dev) {
933 pm_runtime_set_active(dev->pm_dev);
934 pm_runtime_enable(dev->pm_dev);
935 }
936
937 if (lis3lv02d_joystick_enable())
938 pr_err("joystick initialization failed\n");
939
940 /* passing in platform specific data is purely optional and only
941 * used by the SPI transport layer at the moment */
942 if (dev->pdata) {
943 struct lis3lv02d_platform_data *p = dev->pdata;
944
945 if (dev->whoami == WAI_8B)
946 lis3lv02d_8b_configure(dev, p);
947
948 irq_flags = p->irq_flags1 & IRQF_TRIGGER_MASK;
949
950 dev->irq_cfg = p->irq_cfg;
951 if (p->irq_cfg)
952 dev->write(dev, CTRL_REG3, p->irq_cfg);
953
954 if (p->default_rate)
955 lis3lv02d_set_odr(p->default_rate);
956 }
957
958 /* bail if we did not get an IRQ from the bus layer */
959 if (!dev->irq) {
960 pr_debug("No IRQ. Disabling /dev/freefall\n");
961 goto out;
962 }
963
964 /*
965 * The sensor can generate interrupts for free-fall and direction
966 * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep
967 * the things simple and _fast_ we activate it only for free-fall, so
968 * no need to read register (very slow with ACPI). For the same reason,
969 * we forbid shared interrupts.
970 *
971 * IRQF_TRIGGER_RISING seems pointless on HP laptops because the
972 * io-apic is not configurable (and generates a warning) but I keep it
973 * in case of support for other hardware.
974 */
975 if (dev->pdata && dev->whoami == WAI_8B)
976 thread_fn = lis302dl_interrupt_thread1_8b;
977 else
978 thread_fn = NULL;
979
980 err = request_threaded_irq(dev->irq, lis302dl_interrupt,
981 thread_fn,
982 IRQF_TRIGGER_RISING | IRQF_ONESHOT |
983 irq_flags,
984 DRIVER_NAME, &lis3_dev);
985
986 if (err < 0) {
987 pr_err("Cannot get IRQ\n");
988 goto out;
989 }
990
991 if (misc_register(&lis3lv02d_misc_device))
992 pr_err("misc_register failed\n");
993 out:
994 return 0;
995 }
996 EXPORT_SYMBOL_GPL(lis3lv02d_init_device);
997
998 MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
999 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
1000 MODULE_LICENSE("GPL");
Linux with added FPC-III support