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)
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
88 struct lis3lv02d lis3_dev = {
89 .misc_wait = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait),
91 EXPORT_SYMBOL_GPL(lis3_dev);
93 /* just like param_set_int() but does sanity-check so that it won't point
94 * over the axis array size
96 static int param_set_axis(const char *val, const struct kernel_param *kp)
98 int ret = param_set_int(val, kp);
100 int val = *(int *)kp->arg;
109 static struct kernel_param_ops param_ops_axis = {
110 .set = param_set_axis,
111 .get = param_get_int,
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");
117 static s16 lis3lv02d_read_8(struct lis3lv02d *lis3, int reg)
120 if (lis3->read(lis3, reg, &lo) < 0)
126 static s16 lis3lv02d_read_12(struct lis3lv02d *lis3, int reg)
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);
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
141 * Returns the converted value.
143 static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3])
146 return hw_values[axis - 1];
148 return -hw_values[-axis - 1];
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
158 * Note that 40Hz input device can eat up about 10% CPU at 800MHZ
160 static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z)
166 if (lis3_dev.whoami == WAI_12B) {
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]);
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];
179 position[0] = lis3->read_data(lis3, OUTX);
180 position[1] = lis3->read_data(lis3, OUTY);
181 position[2] = lis3->read_data(lis3, OUTZ);
184 for (i = 0; i < 3; i++)
185 position[i] = (position[i] * lis3->scale) / LIS3_ACCURACY;
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);
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};
197 /* ODR is Output Data Rate */
198 static int lis3lv02d_get_odr(void)
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)];
209 static int lis3lv02d_get_pwron_wait(struct lis3lv02d *lis3)
211 int div = lis3lv02d_get_odr();
213 if (WARN_ONCE(div == 0, "device returned spurious data"))
216 /* LIS3 power on delay is quite long */
217 msleep(lis3->pwron_delay / div);
221 static int lis3lv02d_set_odr(int rate)
229 lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl);
230 ctrl &= ~lis3_dev.odr_mask;
231 len = 1 << hweight_long(lis3_dev.odr_mask); /* # of possible values */
232 shift = ffs(lis3_dev.odr_mask) - 1;
234 for (i = 0; i < len; i++)
235 if (lis3_dev.odrs[i] == rate) {
236 lis3_dev.write(&lis3_dev, CTRL_REG1,
237 ctrl | (i << shift));
243 static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
250 unsigned char irq_cfg;
252 mutex_lock(&lis3->mutex);
254 irq_cfg = lis3->irq_cfg;
255 if (lis3_dev.whoami == WAI_8B) {
256 lis3->data_ready_count[IRQ_LINE0] = 0;
257 lis3->data_ready_count[IRQ_LINE1] = 0;
259 /* Change interrupt cfg to data ready for selftest */
260 atomic_inc(&lis3_dev.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));
268 if (lis3_dev.whoami == WAI_3DC) {
270 selftest = CTRL4_ST0;
273 if (lis3_dev.whoami == WAI_12B)
276 selftest = CTRL1_STP;
279 lis3->read(lis3, ctlreg, ®);
280 lis3->write(lis3, ctlreg, (reg | selftest));
281 ret = lis3lv02d_get_pwron_wait(lis3);
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);
290 /* back to normal settings */
291 lis3->write(lis3, ctlreg, reg);
292 ret = lis3lv02d_get_pwron_wait(lis3);
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);
302 if (lis3_dev.whoami == WAI_8B) {
303 /* Restore original interrupt configuration */
304 atomic_dec(&lis3_dev.wake_thread);
305 lis3->write(lis3, CTRL_REG3, ctrl_reg_data);
306 lis3->irq_cfg = irq_cfg;
308 if ((irq_cfg & LIS3_IRQ1_MASK) &&
309 lis3->data_ready_count[IRQ_LINE0] < 2) {
314 if ((irq_cfg & LIS3_IRQ2_MASK) &&
315 lis3->data_ready_count[IRQ_LINE1] < 2) {
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])) {
335 mutex_unlock(&lis3->mutex);
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
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};
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};
355 static inline void lis3_context_save(struct lis3lv02d *lis3)
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;
363 static inline void lis3_context_restore(struct lis3lv02d *lis3)
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]);
371 void lis3lv02d_poweroff(struct lis3lv02d *lis3)
374 lis3_context_save(lis3);
375 /* disable X,Y,Z axis and power down */
376 lis3->write(lis3, CTRL_REG1, 0x00);
378 lis3->reg_ctrl(lis3, LIS3_REG_OFF);
380 EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);
382 int lis3lv02d_poweron(struct lis3lv02d *lis3)
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.
395 lis3->read(lis3, CTRL_REG2, ®);
396 if (lis3->whoami == WAI_12B)
397 reg |= CTRL2_BDU | CTRL2_BOOT;
399 reg |= CTRL2_BOOT_8B;
400 lis3->write(lis3, CTRL_REG2, reg);
402 err = lis3lv02d_get_pwron_wait(lis3);
407 lis3_context_restore(lis3);
411 EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
414 static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev)
418 mutex_lock(&lis3_dev.mutex);
419 lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
420 input_report_abs(pidev->input, ABS_X, x);
421 input_report_abs(pidev->input, ABS_Y, y);
422 input_report_abs(pidev->input, ABS_Z, z);
423 input_sync(pidev->input);
424 mutex_unlock(&lis3_dev.mutex);
427 static void lis3lv02d_joystick_open(struct input_polled_dev *pidev)
430 pm_runtime_get_sync(lis3_dev.pm_dev);
432 if (lis3_dev.pdata && lis3_dev.whoami == WAI_8B && lis3_dev.idev)
433 atomic_set(&lis3_dev.wake_thread, 1);
435 * Update coordinates for the case where poll interval is 0 and
436 * the chip in running purely under interrupt control
438 lis3lv02d_joystick_poll(pidev);
441 static void lis3lv02d_joystick_close(struct input_polled_dev *pidev)
443 atomic_set(&lis3_dev.wake_thread, 0);
445 pm_runtime_put(lis3_dev.pm_dev);
448 static irqreturn_t lis302dl_interrupt(int irq, void *dummy)
450 if (!test_bit(0, &lis3_dev.misc_opened))
454 * Be careful: on some HP laptops the bios force DD when on battery and
455 * the lid is closed. This leads to interrupts as soon as a little move
458 atomic_inc(&lis3_dev.count);
460 wake_up_interruptible(&lis3_dev.misc_wait);
461 kill_fasync(&lis3_dev.async_queue, SIGIO, POLL_IN);
463 if (atomic_read(&lis3_dev.wake_thread))
464 return IRQ_WAKE_THREAD;
468 static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3)
470 struct input_dev *dev = lis3->idev->input;
473 mutex_lock(&lis3->mutex);
474 lis3->read(lis3, CLICK_SRC, &click_src);
476 if (click_src & CLICK_SINGLE_X) {
477 input_report_key(dev, lis3->mapped_btns[0], 1);
478 input_report_key(dev, lis3->mapped_btns[0], 0);
481 if (click_src & CLICK_SINGLE_Y) {
482 input_report_key(dev, lis3->mapped_btns[1], 1);
483 input_report_key(dev, lis3->mapped_btns[1], 0);
486 if (click_src & CLICK_SINGLE_Z) {
487 input_report_key(dev, lis3->mapped_btns[2], 1);
488 input_report_key(dev, lis3->mapped_btns[2], 0);
491 mutex_unlock(&lis3->mutex);
494 static inline void lis302dl_data_ready(struct lis3lv02d *lis3, int index)
498 /* Dummy read to ack interrupt */
499 lis3lv02d_get_xyz(lis3, &dummy, &dummy, &dummy);
500 lis3->data_ready_count[index]++;
503 static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data)
505 struct lis3lv02d *lis3 = data;
506 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ1_MASK;
508 if (irq_cfg == LIS3_IRQ1_CLICK)
509 lis302dl_interrupt_handle_click(lis3);
510 else if (unlikely(irq_cfg == LIS3_IRQ1_DATA_READY))
511 lis302dl_data_ready(lis3, IRQ_LINE0);
513 lis3lv02d_joystick_poll(lis3->idev);
518 static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data)
520 struct lis3lv02d *lis3 = data;
521 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ2_MASK;
523 if (irq_cfg == LIS3_IRQ2_CLICK)
524 lis302dl_interrupt_handle_click(lis3);
525 else if (unlikely(irq_cfg == LIS3_IRQ2_DATA_READY))
526 lis302dl_data_ready(lis3, IRQ_LINE1);
528 lis3lv02d_joystick_poll(lis3->idev);
533 static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
535 if (test_and_set_bit(0, &lis3_dev.misc_opened))
536 return -EBUSY; /* already open */
539 pm_runtime_get_sync(lis3_dev.pm_dev);
541 atomic_set(&lis3_dev.count, 0);
545 static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
547 fasync_helper(-1, file, 0, &lis3_dev.async_queue);
548 clear_bit(0, &lis3_dev.misc_opened); /* release the device */
550 pm_runtime_put(lis3_dev.pm_dev);
554 static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf,
555 size_t count, loff_t *pos)
557 DECLARE_WAITQUEUE(wait, current);
559 unsigned char byte_data;
565 add_wait_queue(&lis3_dev.misc_wait, &wait);
567 set_current_state(TASK_INTERRUPTIBLE);
568 data = atomic_xchg(&lis3_dev.count, 0);
572 if (file->f_flags & O_NONBLOCK) {
577 if (signal_pending(current)) {
578 retval = -ERESTARTSYS;
590 /* make sure we are not going into copy_to_user() with
591 * TASK_INTERRUPTIBLE state */
592 set_current_state(TASK_RUNNING);
593 if (copy_to_user(buf, &byte_data, sizeof(byte_data)))
597 __set_current_state(TASK_RUNNING);
598 remove_wait_queue(&lis3_dev.misc_wait, &wait);
603 static unsigned int lis3lv02d_misc_poll(struct file *file, poll_table *wait)
605 poll_wait(file, &lis3_dev.misc_wait, wait);
606 if (atomic_read(&lis3_dev.count))
607 return POLLIN | POLLRDNORM;
611 static int lis3lv02d_misc_fasync(int fd, struct file *file, int on)
613 return fasync_helper(fd, file, on, &lis3_dev.async_queue);
616 static const struct file_operations lis3lv02d_misc_fops = {
617 .owner = THIS_MODULE,
619 .read = lis3lv02d_misc_read,
620 .open = lis3lv02d_misc_open,
621 .release = lis3lv02d_misc_release,
622 .poll = lis3lv02d_misc_poll,
623 .fasync = lis3lv02d_misc_fasync,
626 static struct miscdevice lis3lv02d_misc_device = {
627 .minor = MISC_DYNAMIC_MINOR,
629 .fops = &lis3lv02d_misc_fops,
632 int lis3lv02d_joystick_enable(void)
634 struct input_dev *input_dev;
636 int max_val, fuzz, flat;
637 int btns[] = {BTN_X, BTN_Y, BTN_Z};
642 lis3_dev.idev = input_allocate_polled_device();
646 lis3_dev.idev->poll = lis3lv02d_joystick_poll;
647 lis3_dev.idev->open = lis3lv02d_joystick_open;
648 lis3_dev.idev->close = lis3lv02d_joystick_close;
649 lis3_dev.idev->poll_interval = MDPS_POLL_INTERVAL;
650 lis3_dev.idev->poll_interval_min = MDPS_POLL_MIN;
651 lis3_dev.idev->poll_interval_max = MDPS_POLL_MAX;
652 input_dev = lis3_dev.idev->input;
654 input_dev->name = "ST LIS3LV02DL Accelerometer";
655 input_dev->phys = DRIVER_NAME "/input0";
656 input_dev->id.bustype = BUS_HOST;
657 input_dev->id.vendor = 0;
658 input_dev->dev.parent = &lis3_dev.pdev->dev;
660 set_bit(EV_ABS, input_dev->evbit);
661 max_val = (lis3_dev.mdps_max_val * lis3_dev.scale) / LIS3_ACCURACY;
662 if (lis3_dev.whoami == WAI_12B) {
663 fuzz = LIS3_DEFAULT_FUZZ_12B;
664 flat = LIS3_DEFAULT_FLAT_12B;
666 fuzz = LIS3_DEFAULT_FUZZ_8B;
667 flat = LIS3_DEFAULT_FLAT_8B;
669 fuzz = (fuzz * lis3_dev.scale) / LIS3_ACCURACY;
670 flat = (flat * lis3_dev.scale) / LIS3_ACCURACY;
672 input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat);
673 input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat);
674 input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat);
676 lis3_dev.mapped_btns[0] = lis3lv02d_get_axis(abs(lis3_dev.ac.x), btns);
677 lis3_dev.mapped_btns[1] = lis3lv02d_get_axis(abs(lis3_dev.ac.y), btns);
678 lis3_dev.mapped_btns[2] = lis3lv02d_get_axis(abs(lis3_dev.ac.z), btns);
680 err = input_register_polled_device(lis3_dev.idev);
682 input_free_polled_device(lis3_dev.idev);
683 lis3_dev.idev = NULL;
688 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
690 void lis3lv02d_joystick_disable(void)
693 free_irq(lis3_dev.irq, &lis3_dev);
694 if (lis3_dev.pdata && lis3_dev.pdata->irq2)
695 free_irq(lis3_dev.pdata->irq2, &lis3_dev);
701 misc_deregister(&lis3lv02d_misc_device);
702 input_unregister_polled_device(lis3_dev.idev);
703 input_free_polled_device(lis3_dev.idev);
704 lis3_dev.idev = NULL;
706 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
709 static void lis3lv02d_sysfs_poweron(struct lis3lv02d *lis3)
712 * SYSFS functions are fast visitors so put-call
713 * immediately after the get-call. However, keep
714 * chip running for a while and schedule delayed
715 * suspend. This way periodic sysfs calls doesn't
716 * suffer from relatively long power up time.
720 pm_runtime_get_sync(lis3->pm_dev);
721 pm_runtime_put_noidle(lis3->pm_dev);
722 pm_schedule_suspend(lis3->pm_dev, LIS3_SYSFS_POWERDOWN_DELAY);
726 static ssize_t lis3lv02d_selftest_show(struct device *dev,
727 struct device_attribute *attr, char *buf)
731 static const char ok[] = "OK";
732 static const char fail[] = "FAIL";
733 static const char irq[] = "FAIL_IRQ";
736 lis3lv02d_sysfs_poweron(&lis3_dev);
737 switch (lis3lv02d_selftest(&lis3_dev, values)) {
749 return sprintf(buf, "%s %d %d %d\n", res,
750 values[0], values[1], values[2]);
753 static ssize_t lis3lv02d_position_show(struct device *dev,
754 struct device_attribute *attr, char *buf)
758 lis3lv02d_sysfs_poweron(&lis3_dev);
759 mutex_lock(&lis3_dev.mutex);
760 lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
761 mutex_unlock(&lis3_dev.mutex);
762 return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
765 static ssize_t lis3lv02d_rate_show(struct device *dev,
766 struct device_attribute *attr, char *buf)
768 lis3lv02d_sysfs_poweron(&lis3_dev);
769 return sprintf(buf, "%d\n", lis3lv02d_get_odr());
772 static ssize_t lis3lv02d_rate_set(struct device *dev,
773 struct device_attribute *attr, const char *buf,
778 if (strict_strtoul(buf, 0, &rate))
781 lis3lv02d_sysfs_poweron(&lis3_dev);
782 if (lis3lv02d_set_odr(rate))
788 static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL);
789 static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
790 static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show,
793 static struct attribute *lis3lv02d_attributes[] = {
794 &dev_attr_selftest.attr,
795 &dev_attr_position.attr,
800 static struct attribute_group lis3lv02d_attribute_group = {
801 .attrs = lis3lv02d_attributes
805 static int lis3lv02d_add_fs(struct lis3lv02d *lis3)
807 lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
808 if (IS_ERR(lis3->pdev))
809 return PTR_ERR(lis3->pdev);
811 return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
814 int lis3lv02d_remove_fs(struct lis3lv02d *lis3)
816 sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
817 platform_device_unregister(lis3->pdev);
819 /* Barrier after the sysfs remove */
820 pm_runtime_barrier(lis3->pm_dev);
822 /* SYSFS may have left chip running. Turn off if necessary */
823 if (!pm_runtime_suspended(lis3->pm_dev))
824 lis3lv02d_poweroff(&lis3_dev);
826 pm_runtime_disable(lis3->pm_dev);
827 pm_runtime_set_suspended(lis3->pm_dev);
829 kfree(lis3->reg_cache);
832 EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
834 static void lis3lv02d_8b_configure(struct lis3lv02d *lis3,
835 struct lis3lv02d_platform_data *p)
838 int ctrl2 = p->hipass_ctrl;
840 if (p->click_flags) {
841 lis3->write(lis3, CLICK_CFG, p->click_flags);
842 lis3->write(lis3, CLICK_TIMELIMIT, p->click_time_limit);
843 lis3->write(lis3, CLICK_LATENCY, p->click_latency);
844 lis3->write(lis3, CLICK_WINDOW, p->click_window);
845 lis3->write(lis3, CLICK_THSZ, p->click_thresh_z & 0xf);
846 lis3->write(lis3, CLICK_THSY_X,
847 (p->click_thresh_x & 0xf) |
848 (p->click_thresh_y << 4));
851 struct input_dev *input_dev = lis3_dev.idev->input;
852 input_set_capability(input_dev, EV_KEY, BTN_X);
853 input_set_capability(input_dev, EV_KEY, BTN_Y);
854 input_set_capability(input_dev, EV_KEY, BTN_Z);
858 if (p->wakeup_flags) {
859 lis3->write(lis3, FF_WU_CFG_1, p->wakeup_flags);
860 lis3->write(lis3, FF_WU_THS_1, p->wakeup_thresh & 0x7f);
861 /* pdata value + 1 to keep this backward compatible*/
862 lis3->write(lis3, FF_WU_DURATION_1, p->duration1 + 1);
863 ctrl2 ^= HP_FF_WU1; /* Xor to keep compatible with old pdata*/
866 if (p->wakeup_flags2) {
867 lis3->write(lis3, FF_WU_CFG_2, p->wakeup_flags2);
868 lis3->write(lis3, FF_WU_THS_2, p->wakeup_thresh2 & 0x7f);
869 /* pdata value + 1 to keep this backward compatible*/
870 lis3->write(lis3, FF_WU_DURATION_2, p->duration2 + 1);
871 ctrl2 ^= HP_FF_WU2; /* Xor to keep compatible with old pdata*/
873 /* Configure hipass filters */
874 lis3->write(lis3, CTRL_REG2, ctrl2);
877 err = request_threaded_irq(p->irq2,
879 lis302dl_interrupt_thread2_8b,
880 IRQF_TRIGGER_RISING | IRQF_ONESHOT |
881 (p->irq_flags2 & IRQF_TRIGGER_MASK),
882 DRIVER_NAME, &lis3_dev);
884 pr_err("No second IRQ. Limited functionality\n");
889 * Initialise the accelerometer and the various subsystems.
890 * Should be rather independent of the bus system.
892 int lis3lv02d_init_device(struct lis3lv02d *lis3)
895 irq_handler_t thread_fn;
898 lis3->whoami = lis3lv02d_read_8(lis3, WHO_AM_I);
900 switch (lis3->whoami) {
902 pr_info("12 bits sensor found\n");
903 lis3->read_data = lis3lv02d_read_12;
904 lis3->mdps_max_val = 2048;
905 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_12B;
906 lis3->odrs = lis3_12_rates;
907 lis3->odr_mask = CTRL1_DF0 | CTRL1_DF1;
908 lis3->scale = LIS3_SENSITIVITY_12B;
909 lis3->regs = lis3_wai12_regs;
910 lis3->regs_size = ARRAY_SIZE(lis3_wai12_regs);
913 pr_info("8 bits sensor found\n");
914 lis3->read_data = lis3lv02d_read_8;
915 lis3->mdps_max_val = 128;
916 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
917 lis3->odrs = lis3_8_rates;
918 lis3->odr_mask = CTRL1_DR;
919 lis3->scale = LIS3_SENSITIVITY_8B;
920 lis3->regs = lis3_wai8_regs;
921 lis3->regs_size = ARRAY_SIZE(lis3_wai8_regs);
924 pr_info("8 bits 3DC sensor found\n");
925 lis3->read_data = lis3lv02d_read_8;
926 lis3->mdps_max_val = 128;
927 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
928 lis3->odrs = lis3_3dc_rates;
929 lis3->odr_mask = CTRL1_ODR0|CTRL1_ODR1|CTRL1_ODR2|CTRL1_ODR3;
930 lis3->scale = LIS3_SENSITIVITY_8B;
933 pr_err("unknown sensor type 0x%X\n", lis3->whoami);
937 lis3->reg_cache = kzalloc(max(sizeof(lis3_wai8_regs),
938 sizeof(lis3_wai12_regs)), GFP_KERNEL);
940 if (lis3->reg_cache == NULL) {
941 printk(KERN_ERR DRIVER_NAME "out of memory\n");
945 mutex_init(&lis3->mutex);
946 atomic_set(&lis3->wake_thread, 0);
948 lis3lv02d_add_fs(lis3);
949 err = lis3lv02d_poweron(lis3);
951 lis3lv02d_remove_fs(lis3);
956 pm_runtime_set_active(lis3->pm_dev);
957 pm_runtime_enable(lis3->pm_dev);
960 if (lis3lv02d_joystick_enable())
961 pr_err("joystick initialization failed\n");
963 /* passing in platform specific data is purely optional and only
964 * used by the SPI transport layer at the moment */
966 struct lis3lv02d_platform_data *p = lis3->pdata;
968 if (lis3->whoami == WAI_8B)
969 lis3lv02d_8b_configure(lis3, p);
971 irq_flags = p->irq_flags1 & IRQF_TRIGGER_MASK;
973 lis3->irq_cfg = p->irq_cfg;
975 lis3->write(lis3, CTRL_REG3, p->irq_cfg);
978 lis3lv02d_set_odr(p->default_rate);
981 /* bail if we did not get an IRQ from the bus layer */
983 pr_debug("No IRQ. Disabling /dev/freefall\n");
988 * The sensor can generate interrupts for free-fall and direction
989 * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep
990 * the things simple and _fast_ we activate it only for free-fall, so
991 * no need to read register (very slow with ACPI). For the same reason,
992 * we forbid shared interrupts.
994 * IRQF_TRIGGER_RISING seems pointless on HP laptops because the
995 * io-apic is not configurable (and generates a warning) but I keep it
996 * in case of support for other hardware.
998 if (lis3->pdata && lis3->whoami == WAI_8B)
999 thread_fn = lis302dl_interrupt_thread1_8b;
1003 err = request_threaded_irq(lis3->irq, lis302dl_interrupt,
1005 IRQF_TRIGGER_RISING | IRQF_ONESHOT |
1007 DRIVER_NAME, &lis3_dev);
1010 pr_err("Cannot get IRQ\n");
1014 if (misc_register(&lis3lv02d_misc_device))
1015 pr_err("misc_register failed\n");
1019 EXPORT_SYMBOL_GPL(lis3lv02d_init_device);
1021 MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
1022 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
1023 MODULE_LICENSE("GPL");