2 * lis3lv02d.c - ST LIS3LV02DL accelerometer driver
4 * Copyright (C) 2007-2008 Yan Burman
5 * Copyright (C) 2008 Eric Piel
6 * Copyright (C) 2008-2009 Pavel Machek
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.
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.
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
23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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"
44 #define DRIVER_NAME "lis3lv02d"
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
51 #define LIS3_SYSFS_POWERDOWN_DELAY 5000 /* In milliseconds */
54 #define SELFTEST_FAIL -1
55 #define SELFTEST_IRQ -2
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
69 #define LIS3_PWRON_DELAY_WAI_12B (5000)
70 #define LIS3_PWRON_DELAY_WAI_8B (3000)
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.
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)
84 * LIS3331DLH spec says 1LSBs corresponds 4G/1024 -> 1LSB is 1000/1024 mG.
85 * Sensitivity values for +/-2G, outdata in 12 bits for +/-2G scale. so 4
86 * bits adjustment is required
88 #define LIS3DLH_SENSITIVITY_2G ((LIS3_ACCURACY * 1000) / 1024)
89 #define SHIFT_ADJ_2G 4
91 #define LIS3_DEFAULT_FUZZ_12B 3
92 #define LIS3_DEFAULT_FLAT_12B 3
93 #define LIS3_DEFAULT_FUZZ_8B 1
94 #define LIS3_DEFAULT_FLAT_8B 1
96 struct lis3lv02d lis3_dev = {
97 .misc_wait = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait),
99 EXPORT_SYMBOL_GPL(lis3_dev);
101 /* just like param_set_int() but does sanity-check so that it won't point
102 * over the axis array size
104 static int param_set_axis(const char *val, const struct kernel_param *kp)
106 int ret = param_set_int(val, kp);
108 int val = *(int *)kp->arg;
117 static struct kernel_param_ops param_ops_axis = {
118 .set = param_set_axis,
119 .get = param_get_int,
122 #define param_check_axis(name, p) param_check_int(name, p)
124 module_param_array_named(axes, lis3_dev.ac.as_array, axis, NULL, 0644);
125 MODULE_PARM_DESC(axes, "Axis-mapping for x,y,z directions");
127 static s16 lis3lv02d_read_8(struct lis3lv02d *lis3, int reg)
130 if (lis3->read(lis3, reg, &lo) < 0)
136 static s16 lis3lv02d_read_12(struct lis3lv02d *lis3, int reg)
140 lis3->read(lis3, reg - 1, &lo);
141 lis3->read(lis3, reg, &hi);
142 /* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */
143 return (s16)((hi << 8) | lo);
146 /* 12bits for 2G range, 13 bits for 4G range and 14 bits for 8G range */
147 static s16 lis3lv02d_read_16(struct lis3lv02d *lis3, int reg)
152 lis3->read(lis3, reg - 1, &lo);
153 lis3->read(lis3, reg, &hi);
154 v = (int) ((hi << 8) | lo);
156 return (s16) v >> lis3->shift_adj;
160 * lis3lv02d_get_axis - For the given axis, give the value converted
161 * @axis: 1,2,3 - can also be negative
162 * @hw_values: raw values returned by the hardware
164 * Returns the converted value.
166 static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3])
169 return hw_values[axis - 1];
171 return -hw_values[-axis - 1];
175 * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer
176 * @lis3: pointer to the device struct
177 * @x: where to store the X axis value
178 * @y: where to store the Y axis value
179 * @z: where to store the Z axis value
181 * Note that 40Hz input device can eat up about 10% CPU at 800MHZ
183 static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z)
189 if (lis3->whoami == WAI_12B) {
191 lis3->blkread(lis3, OUTX_L, 6, (u8 *)data);
192 for (i = 0; i < 3; i++)
193 position[i] = (s16)le16_to_cpu(data[i]);
196 /* Data: x, dummy, y, dummy, z */
197 lis3->blkread(lis3, OUTX, 5, data);
198 for (i = 0; i < 3; i++)
199 position[i] = (s8)data[i * 2];
202 position[0] = lis3->read_data(lis3, OUTX);
203 position[1] = lis3->read_data(lis3, OUTY);
204 position[2] = lis3->read_data(lis3, OUTZ);
207 for (i = 0; i < 3; i++)
208 position[i] = (position[i] * lis3->scale) / LIS3_ACCURACY;
210 *x = lis3lv02d_get_axis(lis3->ac.x, position);
211 *y = lis3lv02d_get_axis(lis3->ac.y, position);
212 *z = lis3lv02d_get_axis(lis3->ac.z, position);
215 /* conversion btw sampling rate and the register values */
216 static int lis3_12_rates[4] = {40, 160, 640, 2560};
217 static int lis3_8_rates[2] = {100, 400};
218 static int lis3_3dc_rates[16] = {0, 1, 10, 25, 50, 100, 200, 400, 1600, 5000};
219 static int lis3_3dlh_rates[4] = {50, 100, 400, 1000};
221 /* ODR is Output Data Rate */
222 static int lis3lv02d_get_odr(struct lis3lv02d *lis3)
227 lis3->read(lis3, CTRL_REG1, &ctrl);
228 ctrl &= lis3->odr_mask;
229 shift = ffs(lis3->odr_mask) - 1;
230 return lis3->odrs[(ctrl >> shift)];
233 static int lis3lv02d_get_pwron_wait(struct lis3lv02d *lis3)
235 int div = lis3lv02d_get_odr(lis3);
237 if (WARN_ONCE(div == 0, "device returned spurious data"))
240 /* LIS3 power on delay is quite long */
241 msleep(lis3->pwron_delay / div);
245 static int lis3lv02d_set_odr(struct lis3lv02d *lis3, int rate)
253 lis3->read(lis3, CTRL_REG1, &ctrl);
254 ctrl &= ~lis3->odr_mask;
255 len = 1 << hweight_long(lis3->odr_mask); /* # of possible values */
256 shift = ffs(lis3->odr_mask) - 1;
258 for (i = 0; i < len; i++)
259 if (lis3->odrs[i] == rate) {
260 lis3->write(lis3, CTRL_REG1,
261 ctrl | (i << shift));
267 static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
274 unsigned char irq_cfg;
276 mutex_lock(&lis3->mutex);
278 irq_cfg = lis3->irq_cfg;
279 if (lis3->whoami == WAI_8B) {
280 lis3->data_ready_count[IRQ_LINE0] = 0;
281 lis3->data_ready_count[IRQ_LINE1] = 0;
283 /* Change interrupt cfg to data ready for selftest */
284 atomic_inc(&lis3->wake_thread);
285 lis3->irq_cfg = LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY;
286 lis3->read(lis3, CTRL_REG3, &ctrl_reg_data);
287 lis3->write(lis3, CTRL_REG3, (ctrl_reg_data &
288 ~(LIS3_IRQ1_MASK | LIS3_IRQ2_MASK)) |
289 (LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY));
292 if ((lis3->whoami == WAI_3DC) || (lis3->whoami == WAI_3DLH)) {
294 selftest = CTRL4_ST0;
297 if (lis3->whoami == WAI_12B)
300 selftest = CTRL1_STP;
303 lis3->read(lis3, ctlreg, ®);
304 lis3->write(lis3, ctlreg, (reg | selftest));
305 ret = lis3lv02d_get_pwron_wait(lis3);
309 /* Read directly to avoid axis remap */
310 x = lis3->read_data(lis3, OUTX);
311 y = lis3->read_data(lis3, OUTY);
312 z = lis3->read_data(lis3, OUTZ);
314 /* back to normal settings */
315 lis3->write(lis3, ctlreg, reg);
316 ret = lis3lv02d_get_pwron_wait(lis3);
320 results[0] = x - lis3->read_data(lis3, OUTX);
321 results[1] = y - lis3->read_data(lis3, OUTY);
322 results[2] = z - lis3->read_data(lis3, OUTZ);
326 if (lis3->whoami == WAI_8B) {
327 /* Restore original interrupt configuration */
328 atomic_dec(&lis3->wake_thread);
329 lis3->write(lis3, CTRL_REG3, ctrl_reg_data);
330 lis3->irq_cfg = irq_cfg;
332 if ((irq_cfg & LIS3_IRQ1_MASK) &&
333 lis3->data_ready_count[IRQ_LINE0] < 2) {
338 if ((irq_cfg & LIS3_IRQ2_MASK) &&
339 lis3->data_ready_count[IRQ_LINE1] < 2) {
347 for (i = 0; i < 3; i++) {
348 /* Check against selftest acceptance limits */
349 if ((results[i] < lis3->pdata->st_min_limits[i]) ||
350 (results[i] > lis3->pdata->st_max_limits[i])) {
359 mutex_unlock(&lis3->mutex);
364 * Order of registers in the list affects to order of the restore process.
365 * Perhaps it is a good idea to set interrupt enable register as a last one
366 * after all other configurations
368 static u8 lis3_wai8_regs[] = { FF_WU_CFG_1, FF_WU_THS_1, FF_WU_DURATION_1,
369 FF_WU_CFG_2, FF_WU_THS_2, FF_WU_DURATION_2,
370 CLICK_CFG, CLICK_SRC, CLICK_THSY_X, CLICK_THSZ,
371 CLICK_TIMELIMIT, CLICK_LATENCY, CLICK_WINDOW,
372 CTRL_REG1, CTRL_REG2, CTRL_REG3};
374 static u8 lis3_wai12_regs[] = {FF_WU_CFG, FF_WU_THS_L, FF_WU_THS_H,
375 FF_WU_DURATION, DD_CFG, DD_THSI_L, DD_THSI_H,
376 DD_THSE_L, DD_THSE_H,
377 CTRL_REG1, CTRL_REG3, CTRL_REG2};
379 static inline void lis3_context_save(struct lis3lv02d *lis3)
382 for (i = 0; i < lis3->regs_size; i++)
383 lis3->read(lis3, lis3->regs[i], &lis3->reg_cache[i]);
384 lis3->regs_stored = true;
387 static inline void lis3_context_restore(struct lis3lv02d *lis3)
390 if (lis3->regs_stored)
391 for (i = 0; i < lis3->regs_size; i++)
392 lis3->write(lis3, lis3->regs[i], lis3->reg_cache[i]);
395 void lis3lv02d_poweroff(struct lis3lv02d *lis3)
398 lis3_context_save(lis3);
399 /* disable X,Y,Z axis and power down */
400 lis3->write(lis3, CTRL_REG1, 0x00);
402 lis3->reg_ctrl(lis3, LIS3_REG_OFF);
404 EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);
406 int lis3lv02d_poweron(struct lis3lv02d *lis3)
414 * Common configuration
415 * BDU: (12 bits sensors only) LSB and MSB values are not updated until
416 * both have been read. So the value read will always be correct.
417 * Set BOOT bit to refresh factory tuning values.
420 lis3->read(lis3, CTRL_REG2, ®);
421 if (lis3->whoami == WAI_12B)
422 reg |= CTRL2_BDU | CTRL2_BOOT;
423 else if (lis3->whoami == WAI_3DLH)
424 reg |= CTRL2_BOOT_3DLH;
426 reg |= CTRL2_BOOT_8B;
427 lis3->write(lis3, CTRL_REG2, reg);
429 if (lis3->whoami == WAI_3DLH) {
430 lis3->read(lis3, CTRL_REG4, ®);
432 lis3->write(lis3, CTRL_REG4, reg);
436 err = lis3lv02d_get_pwron_wait(lis3);
441 lis3_context_restore(lis3);
445 EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
448 static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev)
450 struct lis3lv02d *lis3 = pidev->private;
453 mutex_lock(&lis3->mutex);
454 lis3lv02d_get_xyz(lis3, &x, &y, &z);
455 input_report_abs(pidev->input, ABS_X, x);
456 input_report_abs(pidev->input, ABS_Y, y);
457 input_report_abs(pidev->input, ABS_Z, z);
458 input_sync(pidev->input);
459 mutex_unlock(&lis3->mutex);
462 static void lis3lv02d_joystick_open(struct input_polled_dev *pidev)
464 struct lis3lv02d *lis3 = pidev->private;
467 pm_runtime_get_sync(lis3->pm_dev);
469 if (lis3->pdata && lis3->whoami == WAI_8B && lis3->idev)
470 atomic_set(&lis3->wake_thread, 1);
472 * Update coordinates for the case where poll interval is 0 and
473 * the chip in running purely under interrupt control
475 lis3lv02d_joystick_poll(pidev);
478 static void lis3lv02d_joystick_close(struct input_polled_dev *pidev)
480 struct lis3lv02d *lis3 = pidev->private;
482 atomic_set(&lis3->wake_thread, 0);
484 pm_runtime_put(lis3->pm_dev);
487 static irqreturn_t lis302dl_interrupt(int irq, void *data)
489 struct lis3lv02d *lis3 = data;
491 if (!test_bit(0, &lis3->misc_opened))
495 * Be careful: on some HP laptops the bios force DD when on battery and
496 * the lid is closed. This leads to interrupts as soon as a little move
499 atomic_inc(&lis3->count);
501 wake_up_interruptible(&lis3->misc_wait);
502 kill_fasync(&lis3->async_queue, SIGIO, POLL_IN);
504 if (atomic_read(&lis3->wake_thread))
505 return IRQ_WAKE_THREAD;
509 static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3)
511 struct input_dev *dev = lis3->idev->input;
514 mutex_lock(&lis3->mutex);
515 lis3->read(lis3, CLICK_SRC, &click_src);
517 if (click_src & CLICK_SINGLE_X) {
518 input_report_key(dev, lis3->mapped_btns[0], 1);
519 input_report_key(dev, lis3->mapped_btns[0], 0);
522 if (click_src & CLICK_SINGLE_Y) {
523 input_report_key(dev, lis3->mapped_btns[1], 1);
524 input_report_key(dev, lis3->mapped_btns[1], 0);
527 if (click_src & CLICK_SINGLE_Z) {
528 input_report_key(dev, lis3->mapped_btns[2], 1);
529 input_report_key(dev, lis3->mapped_btns[2], 0);
532 mutex_unlock(&lis3->mutex);
535 static inline void lis302dl_data_ready(struct lis3lv02d *lis3, int index)
539 /* Dummy read to ack interrupt */
540 lis3lv02d_get_xyz(lis3, &dummy, &dummy, &dummy);
541 lis3->data_ready_count[index]++;
544 static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data)
546 struct lis3lv02d *lis3 = data;
547 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ1_MASK;
549 if (irq_cfg == LIS3_IRQ1_CLICK)
550 lis302dl_interrupt_handle_click(lis3);
551 else if (unlikely(irq_cfg == LIS3_IRQ1_DATA_READY))
552 lis302dl_data_ready(lis3, IRQ_LINE0);
554 lis3lv02d_joystick_poll(lis3->idev);
559 static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data)
561 struct lis3lv02d *lis3 = data;
562 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ2_MASK;
564 if (irq_cfg == LIS3_IRQ2_CLICK)
565 lis302dl_interrupt_handle_click(lis3);
566 else if (unlikely(irq_cfg == LIS3_IRQ2_DATA_READY))
567 lis302dl_data_ready(lis3, IRQ_LINE1);
569 lis3lv02d_joystick_poll(lis3->idev);
574 static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
576 struct lis3lv02d *lis3 = container_of(file->private_data,
577 struct lis3lv02d, miscdev);
579 if (test_and_set_bit(0, &lis3->misc_opened))
580 return -EBUSY; /* already open */
583 pm_runtime_get_sync(lis3->pm_dev);
585 atomic_set(&lis3->count, 0);
589 static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
591 struct lis3lv02d *lis3 = container_of(file->private_data,
592 struct lis3lv02d, miscdev);
594 fasync_helper(-1, file, 0, &lis3->async_queue);
595 clear_bit(0, &lis3->misc_opened); /* release the device */
597 pm_runtime_put(lis3->pm_dev);
601 static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf,
602 size_t count, loff_t *pos)
604 struct lis3lv02d *lis3 = container_of(file->private_data,
605 struct lis3lv02d, miscdev);
607 DECLARE_WAITQUEUE(wait, current);
609 unsigned char byte_data;
615 add_wait_queue(&lis3->misc_wait, &wait);
617 set_current_state(TASK_INTERRUPTIBLE);
618 data = atomic_xchg(&lis3->count, 0);
622 if (file->f_flags & O_NONBLOCK) {
627 if (signal_pending(current)) {
628 retval = -ERESTARTSYS;
640 /* make sure we are not going into copy_to_user() with
641 * TASK_INTERRUPTIBLE state */
642 set_current_state(TASK_RUNNING);
643 if (copy_to_user(buf, &byte_data, sizeof(byte_data)))
647 __set_current_state(TASK_RUNNING);
648 remove_wait_queue(&lis3->misc_wait, &wait);
653 static unsigned int lis3lv02d_misc_poll(struct file *file, poll_table *wait)
655 struct lis3lv02d *lis3 = container_of(file->private_data,
656 struct lis3lv02d, miscdev);
658 poll_wait(file, &lis3->misc_wait, wait);
659 if (atomic_read(&lis3->count))
660 return POLLIN | POLLRDNORM;
664 static int lis3lv02d_misc_fasync(int fd, struct file *file, int on)
666 struct lis3lv02d *lis3 = container_of(file->private_data,
667 struct lis3lv02d, miscdev);
669 return fasync_helper(fd, file, on, &lis3->async_queue);
672 static const struct file_operations lis3lv02d_misc_fops = {
673 .owner = THIS_MODULE,
675 .read = lis3lv02d_misc_read,
676 .open = lis3lv02d_misc_open,
677 .release = lis3lv02d_misc_release,
678 .poll = lis3lv02d_misc_poll,
679 .fasync = lis3lv02d_misc_fasync,
682 int lis3lv02d_joystick_enable(struct lis3lv02d *lis3)
684 struct input_dev *input_dev;
686 int max_val, fuzz, flat;
687 int btns[] = {BTN_X, BTN_Y, BTN_Z};
692 lis3->idev = input_allocate_polled_device();
696 lis3->idev->poll = lis3lv02d_joystick_poll;
697 lis3->idev->open = lis3lv02d_joystick_open;
698 lis3->idev->close = lis3lv02d_joystick_close;
699 lis3->idev->poll_interval = MDPS_POLL_INTERVAL;
700 lis3->idev->poll_interval_min = MDPS_POLL_MIN;
701 lis3->idev->poll_interval_max = MDPS_POLL_MAX;
702 lis3->idev->private = lis3;
703 input_dev = lis3->idev->input;
705 input_dev->name = "ST LIS3LV02DL Accelerometer";
706 input_dev->phys = DRIVER_NAME "/input0";
707 input_dev->id.bustype = BUS_HOST;
708 input_dev->id.vendor = 0;
709 input_dev->dev.parent = &lis3->pdev->dev;
711 set_bit(EV_ABS, input_dev->evbit);
712 max_val = (lis3->mdps_max_val * lis3->scale) / LIS3_ACCURACY;
713 if (lis3->whoami == WAI_12B) {
714 fuzz = LIS3_DEFAULT_FUZZ_12B;
715 flat = LIS3_DEFAULT_FLAT_12B;
717 fuzz = LIS3_DEFAULT_FUZZ_8B;
718 flat = LIS3_DEFAULT_FLAT_8B;
720 fuzz = (fuzz * lis3->scale) / LIS3_ACCURACY;
721 flat = (flat * lis3->scale) / LIS3_ACCURACY;
723 input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat);
724 input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat);
725 input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat);
727 lis3->mapped_btns[0] = lis3lv02d_get_axis(abs(lis3->ac.x), btns);
728 lis3->mapped_btns[1] = lis3lv02d_get_axis(abs(lis3->ac.y), btns);
729 lis3->mapped_btns[2] = lis3lv02d_get_axis(abs(lis3->ac.z), btns);
731 err = input_register_polled_device(lis3->idev);
733 input_free_polled_device(lis3->idev);
739 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
741 void lis3lv02d_joystick_disable(struct lis3lv02d *lis3)
744 free_irq(lis3->irq, lis3);
745 if (lis3->pdata && lis3->pdata->irq2)
746 free_irq(lis3->pdata->irq2, lis3);
752 misc_deregister(&lis3->miscdev);
753 input_unregister_polled_device(lis3->idev);
754 input_free_polled_device(lis3->idev);
757 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
760 static void lis3lv02d_sysfs_poweron(struct lis3lv02d *lis3)
763 * SYSFS functions are fast visitors so put-call
764 * immediately after the get-call. However, keep
765 * chip running for a while and schedule delayed
766 * suspend. This way periodic sysfs calls doesn't
767 * suffer from relatively long power up time.
771 pm_runtime_get_sync(lis3->pm_dev);
772 pm_runtime_put_noidle(lis3->pm_dev);
773 pm_schedule_suspend(lis3->pm_dev, LIS3_SYSFS_POWERDOWN_DELAY);
777 static ssize_t lis3lv02d_selftest_show(struct device *dev,
778 struct device_attribute *attr, char *buf)
780 struct lis3lv02d *lis3 = dev_get_drvdata(dev);
783 static const char ok[] = "OK";
784 static const char fail[] = "FAIL";
785 static const char irq[] = "FAIL_IRQ";
788 lis3lv02d_sysfs_poweron(lis3);
789 switch (lis3lv02d_selftest(lis3, values)) {
801 return sprintf(buf, "%s %d %d %d\n", res,
802 values[0], values[1], values[2]);
805 static ssize_t lis3lv02d_position_show(struct device *dev,
806 struct device_attribute *attr, char *buf)
808 struct lis3lv02d *lis3 = dev_get_drvdata(dev);
811 lis3lv02d_sysfs_poweron(lis3);
812 mutex_lock(&lis3->mutex);
813 lis3lv02d_get_xyz(lis3, &x, &y, &z);
814 mutex_unlock(&lis3->mutex);
815 return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
818 static ssize_t lis3lv02d_rate_show(struct device *dev,
819 struct device_attribute *attr, char *buf)
821 struct lis3lv02d *lis3 = dev_get_drvdata(dev);
823 lis3lv02d_sysfs_poweron(lis3);
824 return sprintf(buf, "%d\n", lis3lv02d_get_odr(lis3));
827 static ssize_t lis3lv02d_rate_set(struct device *dev,
828 struct device_attribute *attr, const char *buf,
831 struct lis3lv02d *lis3 = dev_get_drvdata(dev);
834 if (strict_strtoul(buf, 0, &rate))
837 lis3lv02d_sysfs_poweron(lis3);
838 if (lis3lv02d_set_odr(lis3, rate))
844 static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL);
845 static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
846 static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show,
849 static struct attribute *lis3lv02d_attributes[] = {
850 &dev_attr_selftest.attr,
851 &dev_attr_position.attr,
856 static struct attribute_group lis3lv02d_attribute_group = {
857 .attrs = lis3lv02d_attributes
861 static int lis3lv02d_add_fs(struct lis3lv02d *lis3)
863 lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
864 if (IS_ERR(lis3->pdev))
865 return PTR_ERR(lis3->pdev);
867 platform_set_drvdata(lis3->pdev, lis3);
868 return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
871 int lis3lv02d_remove_fs(struct lis3lv02d *lis3)
873 sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
874 platform_device_unregister(lis3->pdev);
876 /* Barrier after the sysfs remove */
877 pm_runtime_barrier(lis3->pm_dev);
879 /* SYSFS may have left chip running. Turn off if necessary */
880 if (!pm_runtime_suspended(lis3->pm_dev))
881 lis3lv02d_poweroff(lis3);
883 pm_runtime_disable(lis3->pm_dev);
884 pm_runtime_set_suspended(lis3->pm_dev);
886 kfree(lis3->reg_cache);
889 EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
891 static void lis3lv02d_8b_configure(struct lis3lv02d *lis3,
892 struct lis3lv02d_platform_data *p)
895 int ctrl2 = p->hipass_ctrl;
897 if (p->click_flags) {
898 lis3->write(lis3, CLICK_CFG, p->click_flags);
899 lis3->write(lis3, CLICK_TIMELIMIT, p->click_time_limit);
900 lis3->write(lis3, CLICK_LATENCY, p->click_latency);
901 lis3->write(lis3, CLICK_WINDOW, p->click_window);
902 lis3->write(lis3, CLICK_THSZ, p->click_thresh_z & 0xf);
903 lis3->write(lis3, CLICK_THSY_X,
904 (p->click_thresh_x & 0xf) |
905 (p->click_thresh_y << 4));
908 struct input_dev *input_dev = lis3->idev->input;
909 input_set_capability(input_dev, EV_KEY, BTN_X);
910 input_set_capability(input_dev, EV_KEY, BTN_Y);
911 input_set_capability(input_dev, EV_KEY, BTN_Z);
915 if (p->wakeup_flags) {
916 lis3->write(lis3, FF_WU_CFG_1, p->wakeup_flags);
917 lis3->write(lis3, FF_WU_THS_1, p->wakeup_thresh & 0x7f);
918 /* pdata value + 1 to keep this backward compatible*/
919 lis3->write(lis3, FF_WU_DURATION_1, p->duration1 + 1);
920 ctrl2 ^= HP_FF_WU1; /* Xor to keep compatible with old pdata*/
923 if (p->wakeup_flags2) {
924 lis3->write(lis3, FF_WU_CFG_2, p->wakeup_flags2);
925 lis3->write(lis3, FF_WU_THS_2, p->wakeup_thresh2 & 0x7f);
926 /* pdata value + 1 to keep this backward compatible*/
927 lis3->write(lis3, FF_WU_DURATION_2, p->duration2 + 1);
928 ctrl2 ^= HP_FF_WU2; /* Xor to keep compatible with old pdata*/
930 /* Configure hipass filters */
931 lis3->write(lis3, CTRL_REG2, ctrl2);
934 err = request_threaded_irq(p->irq2,
936 lis302dl_interrupt_thread2_8b,
937 IRQF_TRIGGER_RISING | IRQF_ONESHOT |
938 (p->irq_flags2 & IRQF_TRIGGER_MASK),
941 pr_err("No second IRQ. Limited functionality\n");
946 * Initialise the accelerometer and the various subsystems.
947 * Should be rather independent of the bus system.
949 int lis3lv02d_init_device(struct lis3lv02d *lis3)
952 irq_handler_t thread_fn;
955 lis3->whoami = lis3lv02d_read_8(lis3, WHO_AM_I);
957 switch (lis3->whoami) {
959 pr_info("12 bits sensor found\n");
960 lis3->read_data = lis3lv02d_read_12;
961 lis3->mdps_max_val = 2048;
962 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_12B;
963 lis3->odrs = lis3_12_rates;
964 lis3->odr_mask = CTRL1_DF0 | CTRL1_DF1;
965 lis3->scale = LIS3_SENSITIVITY_12B;
966 lis3->regs = lis3_wai12_regs;
967 lis3->regs_size = ARRAY_SIZE(lis3_wai12_regs);
970 pr_info("8 bits sensor found\n");
971 lis3->read_data = lis3lv02d_read_8;
972 lis3->mdps_max_val = 128;
973 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
974 lis3->odrs = lis3_8_rates;
975 lis3->odr_mask = CTRL1_DR;
976 lis3->scale = LIS3_SENSITIVITY_8B;
977 lis3->regs = lis3_wai8_regs;
978 lis3->regs_size = ARRAY_SIZE(lis3_wai8_regs);
981 pr_info("8 bits 3DC sensor found\n");
982 lis3->read_data = lis3lv02d_read_8;
983 lis3->mdps_max_val = 128;
984 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
985 lis3->odrs = lis3_3dc_rates;
986 lis3->odr_mask = CTRL1_ODR0|CTRL1_ODR1|CTRL1_ODR2|CTRL1_ODR3;
987 lis3->scale = LIS3_SENSITIVITY_8B;
990 pr_info("16 bits 3DLH sensor found\n");
991 lis3->read_data = lis3lv02d_read_16;
992 lis3->mdps_max_val = 2048; /* 12 bits for 2G */
993 lis3->shift_adj = SHIFT_ADJ_2G;
994 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
995 lis3->odrs = lis3_3dlh_rates;
996 lis3->odr_mask = CTRL1_DR0 | CTRL1_DR1;
997 lis3->scale = LIS3DLH_SENSITIVITY_2G;
1000 pr_err("unknown sensor type 0x%X\n", lis3->whoami);
1004 lis3->reg_cache = kzalloc(max(sizeof(lis3_wai8_regs),
1005 sizeof(lis3_wai12_regs)), GFP_KERNEL);
1007 if (lis3->reg_cache == NULL) {
1008 printk(KERN_ERR DRIVER_NAME "out of memory\n");
1012 mutex_init(&lis3->mutex);
1013 atomic_set(&lis3->wake_thread, 0);
1015 lis3lv02d_add_fs(lis3);
1016 err = lis3lv02d_poweron(lis3);
1018 lis3lv02d_remove_fs(lis3);
1023 pm_runtime_set_active(lis3->pm_dev);
1024 pm_runtime_enable(lis3->pm_dev);
1027 if (lis3lv02d_joystick_enable(lis3))
1028 pr_err("joystick initialization failed\n");
1030 /* passing in platform specific data is purely optional and only
1031 * used by the SPI transport layer at the moment */
1033 struct lis3lv02d_platform_data *p = lis3->pdata;
1035 if (lis3->whoami == WAI_8B)
1036 lis3lv02d_8b_configure(lis3, p);
1038 irq_flags = p->irq_flags1 & IRQF_TRIGGER_MASK;
1040 lis3->irq_cfg = p->irq_cfg;
1042 lis3->write(lis3, CTRL_REG3, p->irq_cfg);
1044 if (p->default_rate)
1045 lis3lv02d_set_odr(lis3, p->default_rate);
1048 /* bail if we did not get an IRQ from the bus layer */
1050 pr_debug("No IRQ. Disabling /dev/freefall\n");
1055 * The sensor can generate interrupts for free-fall and direction
1056 * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep
1057 * the things simple and _fast_ we activate it only for free-fall, so
1058 * no need to read register (very slow with ACPI). For the same reason,
1059 * we forbid shared interrupts.
1061 * IRQF_TRIGGER_RISING seems pointless on HP laptops because the
1062 * io-apic is not configurable (and generates a warning) but I keep it
1063 * in case of support for other hardware.
1065 if (lis3->pdata && lis3->whoami == WAI_8B)
1066 thread_fn = lis302dl_interrupt_thread1_8b;
1070 err = request_threaded_irq(lis3->irq, lis302dl_interrupt,
1072 IRQF_TRIGGER_RISING | IRQF_ONESHOT |
1077 pr_err("Cannot get IRQ\n");
1081 lis3->miscdev.minor = MISC_DYNAMIC_MINOR;
1082 lis3->miscdev.name = "freefall";
1083 lis3->miscdev.fops = &lis3lv02d_misc_fops;
1085 if (misc_register(&lis3->miscdev))
1086 pr_err("misc_register failed\n");
1090 EXPORT_SYMBOL_GPL(lis3lv02d_init_device);
1092 MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
1093 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
1094 MODULE_LICENSE("GPL");