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 */
param_set_axis(const char * val,const struct kernel_param * kp)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
lis3lv02d_read_8(struct lis3lv02d * lis3,int reg)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
lis3lv02d_read_12(struct lis3lv02d * lis3,int reg)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 */
lis3lv02d_get_axis(s8 axis,int hw_values[3])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 */
lis3lv02d_get_xyz(struct lis3lv02d * lis3,int * x,int * y,int * z)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 */
lis3lv02d_get_odr(void)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
lis3lv02d_set_odr(int rate)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
lis3lv02d_selftest(struct lis3lv02d * lis3,s16 results[3])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, ®);
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
lis3_context_save(struct lis3lv02d * lis3)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
lis3_context_restore(struct lis3lv02d * lis3)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
lis3lv02d_poweroff(struct lis3lv02d * lis3)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
lis3lv02d_poweron(struct lis3lv02d * lis3)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 lis3->read(lis3, CTRL_REG2, ®);
379 if (lis3->whoami == WAI_12B)
380 reg |= CTRL2_BDU | CTRL2_BOOT;
381 else
382 reg |= CTRL2_BOOT_8B;
383 lis3->write(lis3, CTRL_REG2, reg);
384
385 /* LIS3 power on delay is quite long */
386 msleep(lis3->pwron_delay / lis3lv02d_get_odr());
387
388 if (lis3->reg_ctrl)
389 lis3_context_restore(lis3);
390 }
391 EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
392
393
lis3lv02d_joystick_poll(struct input_polled_dev * pidev)394 static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev)
395 {
396 int x, y, z;
397
398 mutex_lock(&lis3_dev.mutex);
399 lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
400 input_report_abs(pidev->input, ABS_X, x);
401 input_report_abs(pidev->input, ABS_Y, y);
402 input_report_abs(pidev->input, ABS_Z, z);
403 input_sync(pidev->input);
404 mutex_unlock(&lis3_dev.mutex);
405 }
406
lis3lv02d_joystick_open(struct input_polled_dev * pidev)407 static void lis3lv02d_joystick_open(struct input_polled_dev *pidev)
408 {
409 if (lis3_dev.pm_dev)
410 pm_runtime_get_sync(lis3_dev.pm_dev);
411
412 if (lis3_dev.pdata && lis3_dev.whoami == WAI_8B && lis3_dev.idev)
413 atomic_set(&lis3_dev.wake_thread, 1);
414 /*
415 * Update coordinates for the case where poll interval is 0 and
416 * the chip in running purely under interrupt control
417 */
418 lis3lv02d_joystick_poll(pidev);
419 }
420
lis3lv02d_joystick_close(struct input_polled_dev * pidev)421 static void lis3lv02d_joystick_close(struct input_polled_dev *pidev)
422 {
423 atomic_set(&lis3_dev.wake_thread, 0);
424 if (lis3_dev.pm_dev)
425 pm_runtime_put(lis3_dev.pm_dev);
426 }
427
lis302dl_interrupt(int irq,void * dummy)428 static irqreturn_t lis302dl_interrupt(int irq, void *dummy)
429 {
430 if (!test_bit(0, &lis3_dev.misc_opened))
431 goto out;
432
433 /*
434 * Be careful: on some HP laptops the bios force DD when on battery and
435 * the lid is closed. This leads to interrupts as soon as a little move
436 * is done.
437 */
438 atomic_inc(&lis3_dev.count);
439
440 wake_up_interruptible(&lis3_dev.misc_wait);
441 kill_fasync(&lis3_dev.async_queue, SIGIO, POLL_IN);
442 out:
443 if (atomic_read(&lis3_dev.wake_thread))
444 return IRQ_WAKE_THREAD;
445 return IRQ_HANDLED;
446 }
447
lis302dl_interrupt_handle_click(struct lis3lv02d * lis3)448 static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3)
449 {
450 struct input_dev *dev = lis3->idev->input;
451 u8 click_src;
452
453 mutex_lock(&lis3->mutex);
454 lis3->read(lis3, CLICK_SRC, &click_src);
455
456 if (click_src & CLICK_SINGLE_X) {
457 input_report_key(dev, lis3->mapped_btns[0], 1);
458 input_report_key(dev, lis3->mapped_btns[0], 0);
459 }
460
461 if (click_src & CLICK_SINGLE_Y) {
462 input_report_key(dev, lis3->mapped_btns[1], 1);
463 input_report_key(dev, lis3->mapped_btns[1], 0);
464 }
465
466 if (click_src & CLICK_SINGLE_Z) {
467 input_report_key(dev, lis3->mapped_btns[2], 1);
468 input_report_key(dev, lis3->mapped_btns[2], 0);
469 }
470 input_sync(dev);
471 mutex_unlock(&lis3->mutex);
472 }
473
lis302dl_data_ready(struct lis3lv02d * lis3,int index)474 static inline void lis302dl_data_ready(struct lis3lv02d *lis3, int index)
475 {
476 int dummy;
477
478 /* Dummy read to ack interrupt */
479 lis3lv02d_get_xyz(lis3, &dummy, &dummy, &dummy);
480 lis3->data_ready_count[index]++;
481 }
482
lis302dl_interrupt_thread1_8b(int irq,void * data)483 static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data)
484 {
485 struct lis3lv02d *lis3 = data;
486 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ1_MASK;
487
488 if (irq_cfg == LIS3_IRQ1_CLICK)
489 lis302dl_interrupt_handle_click(lis3);
490 else if (unlikely(irq_cfg == LIS3_IRQ1_DATA_READY))
491 lis302dl_data_ready(lis3, IRQ_LINE0);
492 else
493 lis3lv02d_joystick_poll(lis3->idev);
494
495 return IRQ_HANDLED;
496 }
497
lis302dl_interrupt_thread2_8b(int irq,void * data)498 static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data)
499 {
500 struct lis3lv02d *lis3 = data;
501 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ2_MASK;
502
503 if (irq_cfg == LIS3_IRQ2_CLICK)
504 lis302dl_interrupt_handle_click(lis3);
505 else if (unlikely(irq_cfg == LIS3_IRQ2_DATA_READY))
506 lis302dl_data_ready(lis3, IRQ_LINE1);
507 else
508 lis3lv02d_joystick_poll(lis3->idev);
509
510 return IRQ_HANDLED;
511 }
512
lis3lv02d_misc_open(struct inode * inode,struct file * file)513 static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
514 {
515 if (test_and_set_bit(0, &lis3_dev.misc_opened))
516 return -EBUSY; /* already open */
517
518 if (lis3_dev.pm_dev)
519 pm_runtime_get_sync(lis3_dev.pm_dev);
520
521 atomic_set(&lis3_dev.count, 0);
522 return 0;
523 }
524
lis3lv02d_misc_release(struct inode * inode,struct file * file)525 static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
526 {
527 fasync_helper(-1, file, 0, &lis3_dev.async_queue);
528 clear_bit(0, &lis3_dev.misc_opened); /* release the device */
529 if (lis3_dev.pm_dev)
530 pm_runtime_put(lis3_dev.pm_dev);
531 return 0;
532 }
533
lis3lv02d_misc_read(struct file * file,char __user * buf,size_t count,loff_t * pos)534 static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf,
535 size_t count, loff_t *pos)
536 {
537 DECLARE_WAITQUEUE(wait, current);
538 u32 data;
539 unsigned char byte_data;
540 ssize_t retval = 1;
541
542 if (count < 1)
543 return -EINVAL;
544
545 add_wait_queue(&lis3_dev.misc_wait, &wait);
546 while (true) {
547 set_current_state(TASK_INTERRUPTIBLE);
548 data = atomic_xchg(&lis3_dev.count, 0);
549 if (data)
550 break;
551
552 if (file->f_flags & O_NONBLOCK) {
553 retval = -EAGAIN;
554 goto out;
555 }
556
557 if (signal_pending(current)) {
558 retval = -ERESTARTSYS;
559 goto out;
560 }
561
562 schedule();
563 }
564
565 if (data < 255)
566 byte_data = data;
567 else
568 byte_data = 255;
569
570 /* make sure we are not going into copy_to_user() with
571 * TASK_INTERRUPTIBLE state */
572 set_current_state(TASK_RUNNING);
573 if (copy_to_user(buf, &byte_data, sizeof(byte_data)))
574 retval = -EFAULT;
575
576 out:
577 __set_current_state(TASK_RUNNING);
578 remove_wait_queue(&lis3_dev.misc_wait, &wait);
579
580 return retval;
581 }
582
lis3lv02d_misc_poll(struct file * file,poll_table * wait)583 static unsigned int lis3lv02d_misc_poll(struct file *file, poll_table *wait)
584 {
585 poll_wait(file, &lis3_dev.misc_wait, wait);
586 if (atomic_read(&lis3_dev.count))
587 return POLLIN | POLLRDNORM;
588 return 0;
589 }
590
lis3lv02d_misc_fasync(int fd,struct file * file,int on)591 static int lis3lv02d_misc_fasync(int fd, struct file *file, int on)
592 {
593 return fasync_helper(fd, file, on, &lis3_dev.async_queue);
594 }
595
596 static const struct file_operations lis3lv02d_misc_fops = {
597 .owner = THIS_MODULE,
598 .llseek = no_llseek,
599 .read = lis3lv02d_misc_read,
600 .open = lis3lv02d_misc_open,
601 .release = lis3lv02d_misc_release,
602 .poll = lis3lv02d_misc_poll,
603 .fasync = lis3lv02d_misc_fasync,
604 };
605
606 static struct miscdevice lis3lv02d_misc_device = {
607 .minor = MISC_DYNAMIC_MINOR,
608 .name = "freefall",
609 .fops = &lis3lv02d_misc_fops,
610 };
611
lis3lv02d_joystick_enable(void)612 int lis3lv02d_joystick_enable(void)
613 {
614 struct input_dev *input_dev;
615 int err;
616 int max_val, fuzz, flat;
617 int btns[] = {BTN_X, BTN_Y, BTN_Z};
618
619 if (lis3_dev.idev)
620 return -EINVAL;
621
622 lis3_dev.idev = input_allocate_polled_device();
623 if (!lis3_dev.idev)
624 return -ENOMEM;
625
626 lis3_dev.idev->poll = lis3lv02d_joystick_poll;
627 lis3_dev.idev->open = lis3lv02d_joystick_open;
628 lis3_dev.idev->close = lis3lv02d_joystick_close;
629 lis3_dev.idev->poll_interval = MDPS_POLL_INTERVAL;
630 lis3_dev.idev->poll_interval_min = MDPS_POLL_MIN;
631 lis3_dev.idev->poll_interval_max = MDPS_POLL_MAX;
632 input_dev = lis3_dev.idev->input;
633
634 input_dev->name = "ST LIS3LV02DL Accelerometer";
635 input_dev->phys = DRIVER_NAME "/input0";
636 input_dev->id.bustype = BUS_HOST;
637 input_dev->id.vendor = 0;
638 input_dev->dev.parent = &lis3_dev.pdev->dev;
639
640 set_bit(EV_ABS, input_dev->evbit);
641 max_val = (lis3_dev.mdps_max_val * lis3_dev.scale) / LIS3_ACCURACY;
642 if (lis3_dev.whoami == WAI_12B) {
643 fuzz = LIS3_DEFAULT_FUZZ_12B;
644 flat = LIS3_DEFAULT_FLAT_12B;
645 } else {
646 fuzz = LIS3_DEFAULT_FUZZ_8B;
647 flat = LIS3_DEFAULT_FLAT_8B;
648 }
649 fuzz = (fuzz * lis3_dev.scale) / LIS3_ACCURACY;
650 flat = (flat * lis3_dev.scale) / LIS3_ACCURACY;
651
652 input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat);
653 input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat);
654 input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat);
655
656 lis3_dev.mapped_btns[0] = lis3lv02d_get_axis(abs(lis3_dev.ac.x), btns);
657 lis3_dev.mapped_btns[1] = lis3lv02d_get_axis(abs(lis3_dev.ac.y), btns);
658 lis3_dev.mapped_btns[2] = lis3lv02d_get_axis(abs(lis3_dev.ac.z), btns);
659
660 err = input_register_polled_device(lis3_dev.idev);
661 if (err) {
662 input_free_polled_device(lis3_dev.idev);
663 lis3_dev.idev = NULL;
664 }
665
666 return err;
667 }
668 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
669
lis3lv02d_joystick_disable(void)670 void lis3lv02d_joystick_disable(void)
671 {
672 if (lis3_dev.irq)
673 free_irq(lis3_dev.irq, &lis3_dev);
674 if (lis3_dev.pdata && lis3_dev.pdata->irq2)
675 free_irq(lis3_dev.pdata->irq2, &lis3_dev);
676
677 if (!lis3_dev.idev)
678 return;
679
680 if (lis3_dev.irq)
681 misc_deregister(&lis3lv02d_misc_device);
682 input_unregister_polled_device(lis3_dev.idev);
683 input_free_polled_device(lis3_dev.idev);
684 lis3_dev.idev = NULL;
685 }
686 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
687
688 /* Sysfs stuff */
lis3lv02d_sysfs_poweron(struct lis3lv02d * lis3)689 static void lis3lv02d_sysfs_poweron(struct lis3lv02d *lis3)
690 {
691 /*
692 * SYSFS functions are fast visitors so put-call
693 * immediately after the get-call. However, keep
694 * chip running for a while and schedule delayed
695 * suspend. This way periodic sysfs calls doesn't
696 * suffer from relatively long power up time.
697 */
698
699 if (lis3->pm_dev) {
700 pm_runtime_get_sync(lis3->pm_dev);
701 pm_runtime_put_noidle(lis3->pm_dev);
702 pm_schedule_suspend(lis3->pm_dev, LIS3_SYSFS_POWERDOWN_DELAY);
703 }
704 }
705
lis3lv02d_selftest_show(struct device * dev,struct device_attribute * attr,char * buf)706 static ssize_t lis3lv02d_selftest_show(struct device *dev,
707 struct device_attribute *attr, char *buf)
708 {
709 s16 values[3];
710
711 static const char ok[] = "OK";
712 static const char fail[] = "FAIL";
713 static const char irq[] = "FAIL_IRQ";
714 const char *res;
715
716 lis3lv02d_sysfs_poweron(&lis3_dev);
717 switch (lis3lv02d_selftest(&lis3_dev, values)) {
718 case SELFTEST_FAIL:
719 res = fail;
720 break;
721 case SELFTEST_IRQ:
722 res = irq;
723 break;
724 case SELFTEST_OK:
725 default:
726 res = ok;
727 break;
728 }
729 return sprintf(buf, "%s %d %d %d\n", res,
730 values[0], values[1], values[2]);
731 }
732
lis3lv02d_position_show(struct device * dev,struct device_attribute * attr,char * buf)733 static ssize_t lis3lv02d_position_show(struct device *dev,
734 struct device_attribute *attr, char *buf)
735 {
736 int x, y, z;
737
738 lis3lv02d_sysfs_poweron(&lis3_dev);
739 mutex_lock(&lis3_dev.mutex);
740 lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
741 mutex_unlock(&lis3_dev.mutex);
742 return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
743 }
744
lis3lv02d_rate_show(struct device * dev,struct device_attribute * attr,char * buf)745 static ssize_t lis3lv02d_rate_show(struct device *dev,
746 struct device_attribute *attr, char *buf)
747 {
748 lis3lv02d_sysfs_poweron(&lis3_dev);
749 return sprintf(buf, "%d\n", lis3lv02d_get_odr());
750 }
751
lis3lv02d_rate_set(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)752 static ssize_t lis3lv02d_rate_set(struct device *dev,
753 struct device_attribute *attr, const char *buf,
754 size_t count)
755 {
756 unsigned long rate;
757
758 if (strict_strtoul(buf, 0, &rate))
759 return -EINVAL;
760
761 lis3lv02d_sysfs_poweron(&lis3_dev);
762 if (lis3lv02d_set_odr(rate))
763 return -EINVAL;
764
765 return count;
766 }
767
768 static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL);
769 static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
770 static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show,
771 lis3lv02d_rate_set);
772
773 static struct attribute *lis3lv02d_attributes[] = {
774 &dev_attr_selftest.attr,
775 &dev_attr_position.attr,
776 &dev_attr_rate.attr,
777 NULL
778 };
779
780 static struct attribute_group lis3lv02d_attribute_group = {
781 .attrs = lis3lv02d_attributes
782 };
783
784
lis3lv02d_add_fs(struct lis3lv02d * lis3)785 static int lis3lv02d_add_fs(struct lis3lv02d *lis3)
786 {
787 lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
788 if (IS_ERR(lis3->pdev))
789 return PTR_ERR(lis3->pdev);
790
791 return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
792 }
793
lis3lv02d_remove_fs(struct lis3lv02d * lis3)794 int lis3lv02d_remove_fs(struct lis3lv02d *lis3)
795 {
796 sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
797 platform_device_unregister(lis3->pdev);
798 if (lis3->pm_dev) {
799 /* Barrier after the sysfs remove */
800 pm_runtime_barrier(lis3->pm_dev);
801
802 /* SYSFS may have left chip running. Turn off if necessary */
803 if (!pm_runtime_suspended(lis3->pm_dev))
804 lis3lv02d_poweroff(&lis3_dev);
805
806 pm_runtime_disable(lis3->pm_dev);
807 pm_runtime_set_suspended(lis3->pm_dev);
808 }
809 kfree(lis3->reg_cache);
810 return 0;
811 }
812 EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
813
lis3lv02d_8b_configure(struct lis3lv02d * dev,struct lis3lv02d_platform_data * p)814 static void lis3lv02d_8b_configure(struct lis3lv02d *dev,
815 struct lis3lv02d_platform_data *p)
816 {
817 int err;
818 int ctrl2 = p->hipass_ctrl;
819
820 if (p->click_flags) {
821 dev->write(dev, CLICK_CFG, p->click_flags);
822 dev->write(dev, CLICK_TIMELIMIT, p->click_time_limit);
823 dev->write(dev, CLICK_LATENCY, p->click_latency);
824 dev->write(dev, CLICK_WINDOW, p->click_window);
825 dev->write(dev, CLICK_THSZ, p->click_thresh_z & 0xf);
826 dev->write(dev, CLICK_THSY_X,
827 (p->click_thresh_x & 0xf) |
828 (p->click_thresh_y << 4));
829
830 if (dev->idev) {
831 struct input_dev *input_dev = lis3_dev.idev->input;
832 input_set_capability(input_dev, EV_KEY, BTN_X);
833 input_set_capability(input_dev, EV_KEY, BTN_Y);
834 input_set_capability(input_dev, EV_KEY, BTN_Z);
835 }
836 }
837
838 if (p->wakeup_flags) {
839 dev->write(dev, FF_WU_CFG_1, p->wakeup_flags);
840 dev->write(dev, FF_WU_THS_1, p->wakeup_thresh & 0x7f);
841 /* pdata value + 1 to keep this backward compatible*/
842 dev->write(dev, FF_WU_DURATION_1, p->duration1 + 1);
843 ctrl2 ^= HP_FF_WU1; /* Xor to keep compatible with old pdata*/
844 }
845
846 if (p->wakeup_flags2) {
847 dev->write(dev, FF_WU_CFG_2, p->wakeup_flags2);
848 dev->write(dev, FF_WU_THS_2, p->wakeup_thresh2 & 0x7f);
849 /* pdata value + 1 to keep this backward compatible*/
850 dev->write(dev, FF_WU_DURATION_2, p->duration2 + 1);
851 ctrl2 ^= HP_FF_WU2; /* Xor to keep compatible with old pdata*/
852 }
853 /* Configure hipass filters */
854 dev->write(dev, CTRL_REG2, ctrl2);
855
856 if (p->irq2) {
857 err = request_threaded_irq(p->irq2,
858 NULL,
859 lis302dl_interrupt_thread2_8b,
860 IRQF_TRIGGER_RISING | IRQF_ONESHOT |
861 (p->irq_flags2 & IRQF_TRIGGER_MASK),
862 DRIVER_NAME, &lis3_dev);
863 if (err < 0)
864 pr_err("No second IRQ. Limited functionality\n");
865 }
866 }
867
868 /*
869 * Initialise the accelerometer and the various subsystems.
870 * Should be rather independent of the bus system.
871 */
lis3lv02d_init_device(struct lis3lv02d * dev)872 int lis3lv02d_init_device(struct lis3lv02d *dev)
873 {
874 int err;
875 irq_handler_t thread_fn;
876 int irq_flags = 0;
877
878 dev->whoami = lis3lv02d_read_8(dev, WHO_AM_I);
879
880 switch (dev->whoami) {
881 case WAI_12B:
882 pr_info("12 bits sensor found\n");
883 dev->read_data = lis3lv02d_read_12;
884 dev->mdps_max_val = 2048;
885 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_12B;
886 dev->odrs = lis3_12_rates;
887 dev->odr_mask = CTRL1_DF0 | CTRL1_DF1;
888 dev->scale = LIS3_SENSITIVITY_12B;
889 dev->regs = lis3_wai12_regs;
890 dev->regs_size = ARRAY_SIZE(lis3_wai12_regs);
891 break;
892 case WAI_8B:
893 pr_info("8 bits sensor found\n");
894 dev->read_data = lis3lv02d_read_8;
895 dev->mdps_max_val = 128;
896 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
897 dev->odrs = lis3_8_rates;
898 dev->odr_mask = CTRL1_DR;
899 dev->scale = LIS3_SENSITIVITY_8B;
900 dev->regs = lis3_wai8_regs;
901 dev->regs_size = ARRAY_SIZE(lis3_wai8_regs);
902 break;
903 case WAI_3DC:
904 pr_info("8 bits 3DC sensor found\n");
905 dev->read_data = lis3lv02d_read_8;
906 dev->mdps_max_val = 128;
907 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
908 dev->odrs = lis3_3dc_rates;
909 dev->odr_mask = CTRL1_ODR0|CTRL1_ODR1|CTRL1_ODR2|CTRL1_ODR3;
910 dev->scale = LIS3_SENSITIVITY_8B;
911 break;
912 default:
913 pr_err("unknown sensor type 0x%X\n", dev->whoami);
914 return -EINVAL;
915 }
916
917 dev->reg_cache = kzalloc(max(sizeof(lis3_wai8_regs),
918 sizeof(lis3_wai12_regs)), GFP_KERNEL);
919
920 if (dev->reg_cache == NULL) {
921 printk(KERN_ERR DRIVER_NAME "out of memory\n");
922 return -ENOMEM;
923 }
924
925 mutex_init(&dev->mutex);
926 atomic_set(&dev->wake_thread, 0);
927
928 lis3lv02d_add_fs(dev);
929 lis3lv02d_poweron(dev);
930
931 if (dev->pm_dev) {
932 pm_runtime_set_active(dev->pm_dev);
933 pm_runtime_enable(dev->pm_dev);
934 }
935
936 if (lis3lv02d_joystick_enable())
937 pr_err("joystick initialization failed\n");
938
939 /* passing in platform specific data is purely optional and only
940 * used by the SPI transport layer at the moment */
941 if (dev->pdata) {
942 struct lis3lv02d_platform_data *p = dev->pdata;
943
944 if (dev->whoami == WAI_8B)
945 lis3lv02d_8b_configure(dev, p);
946
947 irq_flags = p->irq_flags1 & IRQF_TRIGGER_MASK;
948
949 dev->irq_cfg = p->irq_cfg;
950 if (p->irq_cfg)
951 dev->write(dev, CTRL_REG3, p->irq_cfg);
952
953 if (p->default_rate)
954 lis3lv02d_set_odr(p->default_rate);
955 }
956
957 /* bail if we did not get an IRQ from the bus layer */
958 if (!dev->irq) {
959 pr_debug("No IRQ. Disabling /dev/freefall\n");
960 goto out;
961 }
962
963 /*
964 * The sensor can generate interrupts for free-fall and direction
965 * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep
966 * the things simple and _fast_ we activate it only for free-fall, so
967 * no need to read register (very slow with ACPI). For the same reason,
968 * we forbid shared interrupts.
969 *
970 * IRQF_TRIGGER_RISING seems pointless on HP laptops because the
971 * io-apic is not configurable (and generates a warning) but I keep it
972 * in case of support for other hardware.
973 */
974 if (dev->pdata && dev->whoami == WAI_8B)
975 thread_fn = lis302dl_interrupt_thread1_8b;
976 else
977 thread_fn = NULL;
978
979 err = request_threaded_irq(dev->irq, lis302dl_interrupt,
980 thread_fn,
981 IRQF_TRIGGER_RISING | IRQF_ONESHOT |
982 irq_flags,
983 DRIVER_NAME, &lis3_dev);
984
985 if (err < 0) {
986 pr_err("Cannot get IRQ\n");
987 goto out;
988 }
989
990 if (misc_register(&lis3lv02d_misc_device))
991 pr_err("misc_register failed\n");
992 out:
993 return 0;
994 }
995 EXPORT_SYMBOL_GPL(lis3lv02d_init_device);
996
997 MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
998 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
999 MODULE_LICENSE("GPL");
1000