1 /* drivers/i2c/chips/akm8975.c - akm8975 compass driver
3 * Copyright (C) 2007-2008 HTC Corporation.
4 * Author: Hou-Kun Chen <houkun.chen@gmail.com>
6 * This software is licensed under the terms of the GNU General Public
7 * License version 2, as published by the Free Software Foundation, and
8 * may be copied, distributed, and modified under those terms.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
18 * Revised by AKM 2009/04/02
22 #include <linux/interrupt.h>
23 #include <linux/i2c.h>
24 #include <linux/slab.h>
25 #include <linux/irq.h>
26 #include <linux/miscdevice.h>
27 #include <linux/gpio.h>
28 #include <linux/uaccess.h>
29 #include <linux/delay.h>
30 #include <linux/input.h>
31 #include <linux/workqueue.h>
32 #include <linux/freezer.h>
33 #include <linux/earlysuspend.h>
36 #define AKM8975_DEBUG 1
37 #define AKM8975_DEBUG_MSG 0
38 #define AKM8975_DEBUG_FUNC 0
39 #define AKM8975_DEBUG_DATA 0
40 #define MAX_FAILURE_COUNT 3
41 #define AKM8975_RETRY_COUNT 10
42 #define AKM8975_DEFAULT_DELAY 100
45 #define AKMDBG(format, ...) printk(KERN_INFO "AKM8975 " format "\n", ## __VA_ARGS__)
47 #define AKMDBG(format, ...)
50 #if AKM8975_DEBUG_FUNC
51 #define AKMFUNC(func) printk(KERN_INFO "AKM8975 " func " is called\n")
56 static struct i2c_client *this_client;
59 struct i2c_client *client;
60 struct input_dev *input_dev;
61 struct work_struct work;
62 struct early_suspend akm_early_suspend;
64 struct akm8975_platform_data *pdata;
67 /* Addresses to scan -- protected by sense_data_mutex */
68 static char sense_data[SENSOR_DATA_SIZE];
69 static struct mutex sense_data_mutex;
70 static DECLARE_WAIT_QUEUE_HEAD(data_ready_wq);
71 static DECLARE_WAIT_QUEUE_HEAD(open_wq);
73 static atomic_t data_ready;
74 static atomic_t open_count;
75 static atomic_t open_flag;
76 static atomic_t reserve_open_flag;
78 static atomic_t m_flag;
79 static atomic_t a_flag;
80 static atomic_t mv_flag;
82 static int failure_count = 0;
84 static short akmd_delay = AKM8975_DEFAULT_DELAY;
86 static atomic_t suspend_flag = ATOMIC_INIT(0);
88 //static struct akm8975_platform_data *pdata;
90 #define AKM_I2C_RATE 100*1000
92 static int AKI2C_RxData(char *rxData, int length)
95 struct i2c_msg msgs[] = {
97 .addr = this_client->addr,
101 .scl_rate = AKM_I2C_RATE,
104 .addr = this_client->addr,
108 .scl_rate = AKM_I2C_RATE,
111 #if AKM8975_DEBUG_DATA
113 char addr = rxData[0];
116 /* Caller should check parameter validity.*/
117 if ((rxData == NULL) || (length < 1)) {
121 for (loop_i = 0; loop_i < AKM8975_RETRY_COUNT; loop_i++) {
122 if (i2c_transfer(this_client->adapter, msgs, 2) > 0) {
128 if (loop_i >= AKM8975_RETRY_COUNT) {
129 printk(KERN_ERR "%s retry over %d\n", __func__, AKM8975_RETRY_COUNT);
132 #if AKM8975_DEBUG_DATA
133 printk(KERN_INFO "RxData: len=%02x, addr=%02x\n data=", length, addr);
134 for (i = 0; i < length; i++) {
135 printk(KERN_INFO " %02x", rxData[i]);
137 printk(KERN_INFO "\n");
142 static int AKI2C_TxData(char *txData, int length)
145 struct i2c_msg msg[] = {
147 .addr = this_client->addr,
151 .scl_rate = AKM_I2C_RATE,
154 #if AKM8975_DEBUG_DATA
158 /* Caller should check parameter validity.*/
159 if ((txData == NULL) || (length < 2)) {
163 for (loop_i = 0; loop_i < AKM8975_RETRY_COUNT; loop_i++) {
164 if (i2c_transfer(this_client->adapter, msg, 1) > 0) {
170 if (loop_i >= AKM8975_RETRY_COUNT) {
171 printk(KERN_ERR "%s retry over %d\n", __func__, AKM8975_RETRY_COUNT);
174 #if AKM8975_DEBUG_DATA
175 printk(KERN_INFO "TxData: len=%02x, addr=%02x\n data=", length, txData[0]);
176 for (i = 0; i < (length-1); i++) {
177 printk(KERN_INFO " %02x", txData[i + 1]);
179 printk(KERN_INFO "\n");
184 static int AKECS_SetMode_SngMeasure(void)
188 AKMDBG("enter %s\n", __func__);
190 atomic_set(&data_ready, 0);
192 /* Set measure mode */
193 buffer[0] = AK8975_REG_CNTL;
194 buffer[1] = AK8975_MODE_SNG_MEASURE;
197 return AKI2C_TxData(buffer, 2);
200 static int AKECS_SetMode_SelfTest(void)
203 AKMDBG("enter %s\n", __func__);
205 /* Set measure mode */
206 buffer[0] = AK8975_REG_CNTL;
207 buffer[1] = AK8975_MODE_SELF_TEST;
209 return AKI2C_TxData(buffer, 2);
212 static int AKECS_SetMode_FUSEAccess(void)
215 AKMDBG("enter %s\n", __func__);
217 /* Set measure mode */
218 buffer[0] = AK8975_REG_CNTL;
219 buffer[1] = AK8975_MODE_FUSE_ACCESS;
221 return AKI2C_TxData(buffer, 2);
224 static int AKECS_SetMode_PowerDown(void)
227 AKMDBG("enter %s\n", __func__);
229 /* Set powerdown mode */
230 buffer[0] = AK8975_REG_CNTL;
231 buffer[1] = AK8975_MODE_POWERDOWN;
233 return AKI2C_TxData(buffer, 2);
236 static int AKECS_SetMode(char mode)
239 AKMDBG("enter %s\n", __func__);
242 case AK8975_MODE_SNG_MEASURE:
243 ret = AKECS_SetMode_SngMeasure();
245 case AK8975_MODE_SELF_TEST:
246 ret = AKECS_SetMode_SelfTest();
248 case AK8975_MODE_FUSE_ACCESS:
249 ret = AKECS_SetMode_FUSEAccess();
251 case AK8975_MODE_POWERDOWN:
252 ret = AKECS_SetMode_PowerDown();
253 /* wait at least 100us after changing mode */
257 AKMDBG("%s: Unknown mode(%d)", __func__, mode);
264 static int AKECS_CheckDevice(void)
268 AKMDBG("enter %s\n", __func__);
270 /* Set measure mode */
271 buffer[0] = AK8975_REG_WIA;
274 ret = AKI2C_RxData(buffer, 1);
278 /* Check read data */
279 if (buffer[0] != 0x48) {
286 static int AKECS_GetData(char *rbuf, int size)
289 /* This function is not exposed, so parameters
290 should be checked internally.*/
291 if ((rbuf == NULL) || (size < SENSOR_DATA_SIZE)) {
295 AKMDBG("enter %s\n", __func__);
296 wait_event_interruptible_timeout(data_ready_wq,
297 atomic_read(&data_ready), 1000);
298 if (!atomic_read(&data_ready)) {
299 AKMDBG("%s: data_ready is not set.", __func__);
300 if (!atomic_read(&suspend_flag)) {
301 AKMDBG("%s: suspend_flag is not set.", __func__);
303 if (failure_count >= MAX_FAILURE_COUNT) {
305 "AKM8975 AKECS_GetData: successive %d failure.\n",
307 atomic_set(&open_flag, -1);
315 mutex_lock(&sense_data_mutex);
316 memcpy(rbuf, sense_data, size);
317 atomic_set(&data_ready, 0);
318 mutex_unlock(&sense_data_mutex);
324 static void AKECS_SetYPR(short *rbuf)
326 struct akm8975_data *data = i2c_get_clientdata(this_client);
327 #if AKM8975_DEBUG_DATA
328 printk(KERN_INFO "AKM8975 %s:\n", __func__);
329 printk(KERN_INFO " yaw =%6d, pitch =%6d, roll =%6d\n",
330 rbuf[0], rbuf[1], rbuf[2]);
331 printk(KERN_INFO " tmp =%6d, m_stat =%6d, g_stat =%6d\n",
332 rbuf[3], rbuf[4], rbuf[5]);
333 printk(KERN_INFO " Acceleration[LSB]: %6d,%6d,%6d\n",
334 rbuf[6], rbuf[7], rbuf[8]);
335 printk(KERN_INFO " Geomagnetism[LSB]: %6d,%6d,%6d\n",
336 rbuf[9], rbuf[10], rbuf[11]);
338 AKMDBG("enter %s\n", __func__);
339 /* Report magnetic sensor information */
340 if (atomic_read(&m_flag)) {
341 input_report_abs(data->input_dev, ABS_RX, rbuf[0]);
342 input_report_abs(data->input_dev, ABS_RY, rbuf[1]);
343 input_report_abs(data->input_dev, ABS_RZ, rbuf[2]);
344 input_report_abs(data->input_dev, ABS_RUDDER, rbuf[4]);
347 /* Report acceleration sensor information */
348 if (atomic_read(&a_flag)) {
349 input_report_abs(data->input_dev, ABS_X, rbuf[6]);
350 input_report_abs(data->input_dev, ABS_Y, rbuf[7]);
351 input_report_abs(data->input_dev, ABS_Z, rbuf[8]);
352 input_report_abs(data->input_dev, ABS_WHEEL, rbuf[5]);
355 /* Report magnetic vector information */
356 if (atomic_read(&mv_flag)) {
357 input_report_abs(data->input_dev, ABS_HAT0X, rbuf[9]);
358 input_report_abs(data->input_dev, ABS_HAT0Y, rbuf[10]);
359 input_report_abs(data->input_dev, ABS_BRAKE, rbuf[11]);
362 input_sync(data->input_dev);
365 static int AKECS_GetOpenStatus(void)
367 AKMDBG("enter %s\n", __func__);
368 wait_event_interruptible(open_wq, (atomic_read(&open_flag) != 0));
369 return atomic_read(&open_flag);
372 static int AKECS_GetCloseStatus(void)
374 AKMDBG("enter %s\n", __func__);
375 wait_event_interruptible(open_wq, (atomic_read(&open_flag) <= 0));
376 return atomic_read(&open_flag);
379 static void AKECS_CloseDone(void)
381 AKMDBG("enter %s\n", __func__);
382 atomic_set(&m_flag, 1);
383 atomic_set(&a_flag, 1);
384 atomic_set(&mv_flag, 1);
387 /***** akm_aot functions ***************************************/
388 static int akm_aot_open(struct inode *inode, struct file *file)
392 AKMFUNC("akm_aot_open");
393 if (atomic_cmpxchg(&open_count, 0, 1) == 0) {
394 if (atomic_cmpxchg(&open_flag, 0, 1) == 0) {
395 atomic_set(&reserve_open_flag, 1);
403 static int akm_aot_release(struct inode *inode, struct file *file)
405 AKMFUNC("akm_aot_release");
406 atomic_set(&reserve_open_flag, 0);
407 atomic_set(&open_flag, 0);
408 atomic_set(&open_count, 0);
414 //akm_aot_ioctl(struct inode *inode, struct file *file,
415 // unsigned int cmd, unsigned long arg)
416 static long akm_aot_ioctl(struct file *file,unsigned int cmd, unsigned long arg)
418 void __user *argp = (void __user *)arg;
420 AKMDBG("enter %s\n", __func__);
423 case ECS_IOCTL_APP_SET_MFLAG:
424 case ECS_IOCTL_APP_SET_AFLAG:
425 case ECS_IOCTL_APP_SET_MVFLAG:
426 if (copy_from_user(&flag, argp, sizeof(flag))) {
429 if (flag < 0 || flag > 1) {
433 case ECS_IOCTL_APP_SET_DELAY:
434 if (copy_from_user(&flag, argp, sizeof(flag))) {
443 case ECS_IOCTL_APP_SET_MFLAG:
444 atomic_set(&m_flag, flag);
445 AKMDBG("MFLAG is set to %d", flag);
447 case ECS_IOCTL_APP_GET_MFLAG:
448 flag = atomic_read(&m_flag);
450 case ECS_IOCTL_APP_SET_AFLAG:
451 atomic_set(&a_flag, flag);
452 AKMDBG("AFLAG is set to %d", flag);
454 case ECS_IOCTL_APP_GET_AFLAG:
455 flag = atomic_read(&a_flag);
457 case ECS_IOCTL_APP_SET_MVFLAG:
458 atomic_set(&mv_flag, flag);
459 AKMDBG("MVFLAG is set to %d", flag);
461 case ECS_IOCTL_APP_GET_MVFLAG:
462 flag = atomic_read(&mv_flag);
464 case ECS_IOCTL_APP_SET_DELAY:
466 AKMDBG("Delay is set to %d", flag);
468 case ECS_IOCTL_APP_GET_DELAY:
476 case ECS_IOCTL_APP_GET_MFLAG:
477 case ECS_IOCTL_APP_GET_AFLAG:
478 case ECS_IOCTL_APP_GET_MVFLAG:
479 case ECS_IOCTL_APP_GET_DELAY:
480 if (copy_to_user(argp, &flag, sizeof(flag))) {
491 /***** akmd functions ********************************************/
492 static int akmd_open(struct inode *inode, struct file *file)
494 AKMFUNC("akmd_open");
495 return nonseekable_open(inode, file);
498 static int akmd_release(struct inode *inode, struct file *file)
500 AKMFUNC("akmd_release");
506 static int akm_get_platform_data(struct akm8975_platform_data __user *arg)
508 struct akm8975_data *data = (struct akm8975_data *)i2c_get_clientdata(this_client);
509 struct akm8975_platform_data *pdata_slave;
510 // struct akm8975_platform_data local_pdata_slave;
512 // if (copy_from_user(&local_pdata_slave, arg, sizeof(local_pdata_slave)))
514 pdata_slave = data->pdata;
517 if (copy_to_user(arg, pdata_slave, sizeof(*pdata_slave)))
525 //static int akmd_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
526 // unsigned long arg)
528 static long akmd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
530 void __user *argp = (void __user *)arg;
531 AKMDBG("enter %s\n", __func__);
533 /* NOTE: In this function the size of "char" should be 1-byte. */
534 char sData[SENSOR_DATA_SIZE];/* for GETDATA */
535 char rwbuf[RWBUF_SIZE]; /* for READ/WRITE */
536 char mode; /* for SET_MODE*/
537 short value[12]; /* for SET_YPR */
538 short delay; /* for GET_DELAY */
539 int status; /* for OPEN/CLOSE_STATUS */
540 int ret = -1; /* Return value. */
541 /*AKMDBG("%s (0x%08X).", __func__, cmd);*/
544 case ECS_IOCTL_WRITE:
547 AKMDBG("invalid argument.");
550 if (copy_from_user(&rwbuf, argp, sizeof(rwbuf))) {
551 AKMDBG("copy_from_user failed.");
555 case ECS_IOCTL_SET_MODE:
557 AKMDBG("invalid argument.");
560 if (copy_from_user(&mode, argp, sizeof(mode))) {
561 AKMDBG("copy_from_user failed.");
565 case ECS_IOCTL_SET_YPR:
567 AKMDBG("invalid argument.");
570 if (copy_from_user(&value, argp, sizeof(value))) {
571 AKMDBG("copy_from_user failed.");
580 case ECS_IOCTL_WRITE:
581 AKMFUNC("IOCTL_WRITE");
582 if ((rwbuf[0] < 2) || (rwbuf[0] > (RWBUF_SIZE-1))) {
583 AKMDBG("invalid argument.");
586 ret = AKI2C_TxData(&rwbuf[1], rwbuf[0]);
592 AKMFUNC("IOCTL_READ");
593 if ((rwbuf[0] < 1) || (rwbuf[0] > (RWBUF_SIZE-1))) {
594 AKMDBG("invalid argument.");
597 ret = AKI2C_RxData(&rwbuf[1], rwbuf[0]);
602 case ECS_IOCTL_SET_MODE:
603 AKMFUNC("IOCTL_SET_MODE");
604 ret = AKECS_SetMode(mode);
609 case ECS_IOCTL_GETDATA:
610 AKMFUNC("IOCTL_GET_DATA");
611 ret = AKECS_GetData(sData, SENSOR_DATA_SIZE);
616 case ECS_IOCTL_SET_YPR:
619 case ECS_IOCTL_GET_OPEN_STATUS:
620 AKMFUNC("IOCTL_GET_OPEN_STATUS");
621 status = AKECS_GetOpenStatus();
622 AKMDBG("AKECS_GetOpenStatus returned (%d)", status);
624 case ECS_IOCTL_GET_CLOSE_STATUS:
625 AKMFUNC("IOCTL_GET_CLOSE_STATUS");
626 status = AKECS_GetCloseStatus();
627 AKMDBG("AKECS_GetCloseStatus returned (%d)", status);
629 case ECS_IOCTL_GET_DELAY:
630 AKMFUNC("IOCTL_GET_DELAY");
633 case ECS_IOCTL_GET_PLATFORM_DATA:
634 ret = akm_get_platform_data((struct akm8975_platform_data __user *)arg);
637 printk("%s:error,ret=%d\n",__FUNCTION__, ret);
648 if (copy_to_user(argp, &rwbuf, rwbuf[0]+1)) {
649 AKMDBG("copy_to_user failed.");
653 case ECS_IOCTL_GETDATA:
654 if (copy_to_user(argp, &sData, sizeof(sData))) {
655 AKMDBG("copy_to_user failed.");
659 case ECS_IOCTL_GET_OPEN_STATUS:
660 case ECS_IOCTL_GET_CLOSE_STATUS:
661 if (copy_to_user(argp, &status, sizeof(status))) {
662 AKMDBG("copy_to_user failed.");
666 case ECS_IOCTL_GET_DELAY:
667 if (copy_to_user(argp, &delay, sizeof(delay))) {
668 AKMDBG("copy_to_user failed.");
679 static void akm8975_work_func(struct work_struct *work)
681 char buffer[SENSOR_DATA_SIZE];
683 AKMDBG("enter %s\n", __func__);
685 memset(buffer, 0, SENSOR_DATA_SIZE);
686 buffer[0] = AK8975_REG_ST1;
687 ret = AKI2C_RxData(buffer, SENSOR_DATA_SIZE);
689 printk(KERN_ERR "AKM8975 akm8975_work_func: I2C failed\n");
693 if ((buffer[0] & 0x01) != 0x01) {
694 printk(KERN_ERR "AKM8975 akm8975_work_func: ST is not set\n");
698 mutex_lock(&sense_data_mutex);
699 memcpy(sense_data, buffer, SENSOR_DATA_SIZE);
700 atomic_set(&data_ready, 1);
701 wake_up(&data_ready_wq);
702 mutex_unlock(&sense_data_mutex);
704 enable_irq(this_client->irq);
706 AKMFUNC("akm8975_work_func");
709 static irqreturn_t akm8975_interrupt(int irq, void *dev_id)
711 struct akm8975_data *data = dev_id;
712 AKMFUNC("akm8975_interrupt");
713 disable_irq_nosync(this_client->irq);
714 schedule_work(&data->work);
715 AKMDBG("exit %s\n", __func__);
719 static void akm8975_early_suspend(struct early_suspend *handler)
721 AKMFUNC("akm8975_early_suspend");
722 atomic_set(&suspend_flag, 1);
723 atomic_set(&reserve_open_flag, atomic_read(&open_flag));
724 atomic_set(&open_flag, 0);
726 disable_irq(this_client->irq);
727 AKMDBG("suspended with flag=%d",
728 atomic_read(&reserve_open_flag));
731 static void akm8975_early_resume(struct early_suspend *handler)
733 AKMFUNC("akm8975_early_resume");
734 enable_irq(this_client->irq);
735 atomic_set(&suspend_flag, 0);
736 atomic_set(&open_flag, atomic_read(&reserve_open_flag));
738 AKMDBG("resumed with flag=%d",
739 atomic_read(&reserve_open_flag));
741 static int akm8975_suspend(struct i2c_client *client, pm_message_t mesg)
743 AKMFUNC("akm8975_early_suspend");
744 atomic_set(&suspend_flag, 1);
745 atomic_set(&reserve_open_flag, atomic_read(&open_flag));
746 atomic_set(&open_flag, 0);
748 disable_irq(this_client->irq);
749 AKMDBG("suspended with flag=%d",
750 atomic_read(&reserve_open_flag));
754 static int akm8975_resume(struct i2c_client *client)
756 AKMFUNC("akm8975_early_resume");
757 enable_irq(this_client->irq);
758 atomic_set(&suspend_flag, 0);
759 atomic_set(&open_flag, atomic_read(&reserve_open_flag));
761 AKMDBG("resumed with flag=%d",
762 atomic_read(&reserve_open_flag));
765 /*********************************************/
766 static struct file_operations akmd_fops = {
767 .owner = THIS_MODULE,
769 .release = akmd_release,
770 .unlocked_ioctl = akmd_ioctl,
773 static struct file_operations akm_aot_fops = {
774 .owner = THIS_MODULE,
775 .open = akm_aot_open,
776 .release = akm_aot_release,
777 .unlocked_ioctl = akm_aot_ioctl,
780 static struct miscdevice akmd_device = {
781 .minor = MISC_DYNAMIC_MINOR,
782 .name = "akm8975_dev",
786 static struct miscdevice akm_aot_device = {
787 .minor = MISC_DYNAMIC_MINOR,
788 .name = "akm8975_aot",
789 .fops = &akm_aot_fops,
792 /*********************************************/
793 int akm8975_probe(struct i2c_client *client, const struct i2c_device_id *id)
795 struct akm8975_data *akm;
798 AKMFUNC("akm8975_probe");
800 if (client->dev.platform_data == NULL) {
801 dev_err(&client->dev, "platform data is NULL. exiting.\n");
806 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
807 printk(KERN_ERR "AKM8975 akm8975_probe: check_functionality failed.\n");
812 /* Allocate memory for driver data */
813 akm = kzalloc(sizeof(struct akm8975_data), GFP_KERNEL);
815 printk(KERN_ERR "AKM8975 akm8975_probe: memory allocation failed.\n");
820 akm->pdata = client->dev.platform_data;
822 INIT_WORK(&akm->work, akm8975_work_func);
823 i2c_set_clientdata(client, akm);
825 this_client = client;
827 /* Check connection */
828 err = AKECS_CheckDevice();
830 printk(KERN_ERR "AKM8975 akm8975_probe: set power down mode error\n");
833 akm->eoc_irq = client->irq;
835 dev_dbg(&akm->client->dev, "no IRQ?\n");
838 AKMDBG("gpio %d to irq %d\n", akm->eoc_irq, gpio_to_irq(akm->eoc_irq));
839 akm->eoc_irq = gpio_to_irq(akm->eoc_irq);
841 err = gpio_request(client->irq, "ak_8975");
843 dev_err(&client->dev, "failed to request GPIO, error %d\n", err);
847 err = gpio_direction_input(client->irq);
849 dev_err(&client->dev, "failed to set GPIO direction, error %d\n", err);
852 gpio_pull_updown(client->irq, GPIOPullDown);
855 err = request_irq(akm->eoc_irq, akm8975_interrupt, IRQ_TYPE_EDGE_RISING,
856 "akm8975_DRDY", akm);
858 printk(KERN_ERR "AKM8975 akm8975_probe: request irq failed\n");
862 client->irq = akm->eoc_irq;
864 /* Declare input device */
865 akm->input_dev = input_allocate_device();
866 if (!akm->input_dev) {
869 "AKM8975 akm8975_probe: Failed to allocate input device\n");
872 /* Setup input device */
873 set_bit(EV_ABS, akm->input_dev->evbit);
875 input_set_abs_params(akm->input_dev, ABS_RX, 0, 23040, 0, 0);
876 /* pitch (-180, 180) */
877 input_set_abs_params(akm->input_dev, ABS_RY, -11520, 11520, 0, 0);
879 input_set_abs_params(akm->input_dev, ABS_RZ, -5760, 5760, 0, 0);
880 /* x-axis acceleration (720 x 8G) */
881 input_set_abs_params(akm->input_dev, ABS_X, -5760, 5760, 0, 0);
882 /* y-axis acceleration (720 x 8G) */
883 input_set_abs_params(akm->input_dev, ABS_Y, -5760, 5760, 0, 0);
884 /* z-axis acceleration (720 x 8G) */
885 input_set_abs_params(akm->input_dev, ABS_Z, -5760, 5760, 0, 0);
888 input_set_abs_params(akm->input_dev, ABS_THROTTLE, -30, 85, 0, 0);
890 /* status of magnetic sensor */
891 input_set_abs_params(akm->input_dev, ABS_RUDDER, -32768, 3, 0, 0);
892 /* status of acceleration sensor */
893 input_set_abs_params(akm->input_dev, ABS_WHEEL, -32768, 3, 0, 0);
894 /* x-axis of raw magnetic vector (-4096, 4095) */
895 input_set_abs_params(akm->input_dev, ABS_HAT0X, -20480, 20479, 0, 0);
896 /* y-axis of raw magnetic vector (-4096, 4095) */
897 input_set_abs_params(akm->input_dev, ABS_HAT0Y, -20480, 20479, 0, 0);
898 /* z-axis of raw magnetic vector (-4096, 4095) */
899 input_set_abs_params(akm->input_dev, ABS_BRAKE, -20480, 20479, 0, 0);
901 akm->input_dev->name = "compass";
904 err = input_register_device(akm->input_dev);
907 "AKM8975 akm8975_probe: Unable to register input device\n");
911 err = misc_register(&akmd_device);
914 "AKM8975 akm8975_probe: akmd_device register failed\n");
918 err = misc_register(&akm_aot_device);
921 "AKM8975 akm8975_probe: akm_aot_device register failed\n");
925 mutex_init(&sense_data_mutex);
927 init_waitqueue_head(&data_ready_wq);
928 init_waitqueue_head(&open_wq);
930 /* As default, report all information */
931 atomic_set(&m_flag, 1);
932 atomic_set(&a_flag, 1);
933 atomic_set(&mv_flag, 1);
935 //akm->akm_early_suspend.suspend = akm8975_early_suspend;
936 //akm->akm_early_suspend.resume = akm8975_early_resume;
937 //register_early_suspend(&akm->akm_early_suspend);
939 AKMDBG("successfully probed.");
943 misc_deregister(&akmd_device);
945 input_unregister_device(akm->input_dev);
947 input_free_device(akm->input_dev);
949 free_irq(client->irq, akm);
959 static int akm8975_remove(struct i2c_client *client)
961 struct akm8975_data *akm = i2c_get_clientdata(client);
962 AKMFUNC("akm8975_remove");
963 unregister_early_suspend(&akm->akm_early_suspend);
964 misc_deregister(&akm_aot_device);
965 misc_deregister(&akmd_device);
966 input_unregister_device(akm->input_dev);
967 free_irq(client->irq, akm);
969 AKMDBG("successfully removed.");
973 static const struct i2c_device_id akm8975_id[] = {
974 {AKM8975_I2C_NAME, 0 },
978 static struct i2c_driver akm8975_driver = {
979 .probe = akm8975_probe,
980 .remove = akm8975_remove,
981 .suspend = akm8975_suspend,
982 .resume = akm8975_resume,
983 .id_table = akm8975_id,
985 .name = AKM8975_I2C_NAME,
989 static int __init akm8975_init(void)
991 printk(KERN_INFO "AKM8975 compass driver: initialize\n");
992 return i2c_add_driver(&akm8975_driver);
995 static void __exit akm8975_exit(void)
997 printk(KERN_INFO "AKM8975 compass driver: release\n");
998 i2c_del_driver(&akm8975_driver);
1001 module_init(akm8975_init);
1002 module_exit(akm8975_exit);
1004 MODULE_AUTHOR("viral wang <viral_wang@htc.com>");
1005 MODULE_DESCRIPTION("AKM8975 compass driver");
1006 MODULE_LICENSE("GPL");