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add ak8973 ak8975

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This commit is contained in:
lhh
2010-11-30 09:50:50 +08:00
parent f6f5c47236
commit a93ac942ee
9 changed files with 1372 additions and 4 deletions
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4
arch/arm/mach-rk29/board-rk29sdk.c
View File

@@ -450,13 +450,15 @@ static struct i2c_board_info __initdata board_i2c1_devices[] = {
.type = "ak8973",
.addr = 0x1c,
.flags = 0,
.irq = RK29_PIN4_PA1,
},
#endif
#if defined (CONFIG_SENSORS_AK8973)
#if defined (CONFIG_SENSORS_AK8975)
{
.type = "ak8975",
.addr = 0x1c,
.flags = 0,
.irq = RK29_PIN4_PA1,
},
#endif
};

2
drivers/staging/iio/Kconfig
View File

@@ -42,7 +42,7 @@ config IIO_TRIGGER
source "drivers/staging/iio/accel/Kconfig"
source "drivers/staging/iio/adc/Kconfig"
source "drivers/staging/iio/light/Kconfig"
source "drivers/staging/iio/magnetometer/Kconfig"
source "drivers/staging/iio/trigger/Kconfig"
endif # IIO

4
drivers/staging/iio/Makefile
View File

@@ -12,5 +12,5 @@ obj-$(CONFIG_IIO_SW_RING) += ring_sw.o
obj-y += accel/
obj-y += adc/
obj-y += light/
obj-y += trigger/
obj-y += trigger/
obj-y += magnetometer/

25
drivers/staging/iio/magnetometer/Kconfig Normal file
View File

@@ -0,0 +1,25 @@
#
# Magnetometer sensors
#s"
comment "Magnetometer sensor
config SENSORS_AK8975
tristate "Asahi Kasei AK8975 3-Axis Magnetometer"
default n
depends on I2C
help
Say yes here to build support for Asahi Kasei AK8975 3-Axis
Magnetometer.
To compile this driver as a module, choose M here: the module
will be called ak8975.
config SENSORS_AK8973
tristate "Asahi Kasei AK8973 3-Axis Magnetometer"
default n
depends on I2C
help
Say yes here to build support for Asahi Kasei AK8973 3-Axis
Magnetometer.
To compile this driver as a module, choose M here: the module
will be called ak8973.

5
drivers/staging/iio/magnetometer/Makefile Normal file
View File

@@ -0,0 +1,5 @@
#
# Makefile for industrial I/O Magnetometer sensors
#
obj-$(CONFIG_SENSORS_AK8975) := ak8975.o
obj-$(CONFIG_SENSORS_AK8973) := ak8973.o

751
drivers/staging/iio/magnetometer/ak8973.c Normal file
View File

@@ -0,0 +1,751 @@
/*
* drivers/i2c/chips/ak8973.c - ak8973 compass driver
*
* Copyright (C) 2008 viral wang <viralwang@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*/
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <linux/miscdevice.h>
#include <asm/gpio.h>
#include <asm/uaccess.h>
#include <linux/delay.h>
#include <linux/input.h>
#include <linux/workqueue.h>
#include <linux/freezer.h>
#include "ak8973.h"
#include<linux/earlysuspend.h>
#define DEBUG 0
#define MAX_FAILURE_COUNT 3
static struct i2c_client *this_client;
struct akm8973_data {
struct input_dev *input_dev;
struct work_struct work;
#ifdef CONFIG_HAS_EARLYSUSPEND
struct early_suspend early_suspend_akm;
#endif
};
/* Addresses to scan -- protected by sense_data_mutex */
static char sense_data[RBUFF_SIZE + 1];
static struct mutex sense_data_mutex;
#define AKM8973_RETRY_COUNT 10
static DECLARE_WAIT_QUEUE_HEAD(data_ready_wq);
static DECLARE_WAIT_QUEUE_HEAD(open_wq);
static atomic_t data_ready;
static atomic_t open_count;
static atomic_t open_flag;
static atomic_t reserve_open_flag;
static atomic_t m_flag;
static atomic_t a_flag;
static atomic_t t_flag;
static atomic_t mv_flag;
static int failure_count = 0;
static short akmd_delay = 0;
#ifdef CONFIG_HAS_EARLYSUSPEND
static atomic_t suspend_flag = ATOMIC_INIT(0);
#endif
static int AKI2C_RxData(char *rxData, int length)
{
uint8_t loop_i;
struct i2c_msg msgs[] = {
{
.addr = this_client->addr,
.flags = 0,
.len = 1,
.buf = rxData,
},
{
.addr = this_client->addr,
.flags = I2C_M_RD,
.len = length,
.buf = rxData,
},
};
for (loop_i = 0; loop_i < AKM8973_RETRY_COUNT; loop_i++) {
if (i2c_transfer(this_client->adapter, msgs, 2) > 0) {
break;
}
mdelay(10);
}
if (loop_i >= AKM8973_RETRY_COUNT) {
printk(KERN_ERR "%s retry over %d\n", __func__, AKM8973_RETRY_COUNT);
return -EIO;
}
return 0;
}
static int AKI2C_TxData(char *txData, int length)
{
uint8_t loop_i;
struct i2c_msg msg[] = {
{
.addr = this_client->addr,
.flags = 0,
.len = length,
.buf = txData,
},
};
for (loop_i = 0; loop_i < AKM8973_RETRY_COUNT; loop_i++) {
if (i2c_transfer(this_client->adapter, msg, 1) > 0) {
break;
}
mdelay(10);
}
if (loop_i >= AKM8973_RETRY_COUNT) {
printk(KERN_ERR "%s retry over %d\n", __func__, AKM8973_RETRY_COUNT);
return -EIO;
}
return 0;
}
static int AKECS_StartMeasure(void)
{
char buffer[2];
/* Set measure mode */
buffer[0] = AKECS_REG_MS1;
buffer[1] = AKECS_MODE_MEASURE;
/* Set data */
return AKI2C_TxData(buffer, 2);
}
static int AKECS_PowerDown(void)
{
char buffer[2];
int ret;
/* Set powerdown mode */
buffer[0] = AKECS_REG_MS1;
buffer[1] = AKECS_MODE_POWERDOWN;
/* Set data */
ret = AKI2C_TxData(buffer, 2);
if (ret < 0)
return ret;
/* Dummy read for clearing INT pin */
buffer[0] = AKECS_REG_TMPS;
/* Read data */
ret = AKI2C_RxData(buffer, 1);
if (ret < 0)
return ret;
return ret;
}
static int AKECS_StartE2PRead(void)
{
char buffer[2];
/* Set measure mode */
buffer[0] = AKECS_REG_MS1;
buffer[1] = AKECS_MODE_E2P_READ;
/* Set data */
return AKI2C_TxData(buffer, 2);
}
static int AKECS_GetData(void)
{
char buffer[RBUFF_SIZE + 1];
int ret;
memset(buffer, 0, RBUFF_SIZE + 1);
buffer[0] = AKECS_REG_ST;
ret = AKI2C_RxData(buffer, RBUFF_SIZE+1);
if (ret < 0)
return ret;
mutex_lock(&sense_data_mutex);
memcpy(sense_data, buffer, sizeof(buffer));
atomic_set(&data_ready, 1);
wake_up(&data_ready_wq);
mutex_unlock(&sense_data_mutex);
return 0;
}
static int AKECS_SetMode(char mode)
{
int ret;
switch (mode) {
case AKECS_MODE_MEASURE:
ret = AKECS_StartMeasure();
break;
case AKECS_MODE_E2P_READ:
ret = AKECS_StartE2PRead();
break;
case AKECS_MODE_POWERDOWN:
ret = AKECS_PowerDown();
break;
default:
return -EINVAL;
}
/* wait at least 300us after changing mode */
msleep(1);
return ret;
}
static int AKECS_TransRBuff(char *rbuf, int size)
{
wait_event_interruptible_timeout(data_ready_wq,
atomic_read(&data_ready), 1000);
if (!atomic_read(&data_ready)) {
#ifdef CONFIG_HAS_EARLYSUSPEND
if (!atomic_read(&suspend_flag)) {
printk(KERN_ERR
"AKM8973 AKECS_TransRBUFF: Data not ready\n");
failure_count++;
if (failure_count >= MAX_FAILURE_COUNT) {
printk(KERN_ERR
"AKM8973 AKECS_TransRBUFF: successive %d failure.\n",
failure_count);
atomic_set(&open_flag, -1);
wake_up(&open_wq);
failure_count = 0;
}
}
#endif
return -1;
}
mutex_lock(&sense_data_mutex);
memcpy(&rbuf[1], &sense_data[1], size);
atomic_set(&data_ready, 0);
mutex_unlock(&sense_data_mutex);
failure_count = 0;
return 0;
}
static void AKECS_Report_Value(short *rbuf)
{
struct akm8973_data *data = i2c_get_clientdata(this_client);
#if DEBUG
printk(KERN_INFO"AKECS_Report_Value: yaw = %d, pitch = %d, roll = %d\n", rbuf[0],
rbuf[1], rbuf[2]);
printk(KERN_INFO" tmp = %d, m_stat= %d, g_stat=%d\n", rbuf[3],
rbuf[4], rbuf[5]);
printk(KERN_INFO" G_Sensor: x = %d LSB, y = %d LSB, z = %d LSB\n",
rbuf[6], rbuf[7], rbuf[8]);
#endif
/* Report magnetic sensor information */
if (atomic_read(&m_flag)) {
input_report_abs(data->input_dev, ABS_RX, rbuf[0]);
input_report_abs(data->input_dev, ABS_RY, rbuf[1]);
input_report_abs(data->input_dev, ABS_RZ, rbuf[2]);
input_report_abs(data->input_dev, ABS_RUDDER, rbuf[4]);
}
/* Report acceleration sensor information */
if (atomic_read(&a_flag)) {
input_report_abs(data->input_dev, ABS_X, rbuf[6]);
input_report_abs(data->input_dev, ABS_Y, rbuf[7]);
input_report_abs(data->input_dev, ABS_Z, rbuf[8]);
input_report_abs(data->input_dev, ABS_WHEEL, rbuf[5]);
}
/* Report temperature information */
if (atomic_read(&t_flag))
input_report_abs(data->input_dev, ABS_THROTTLE, rbuf[3]);
if (atomic_read(&mv_flag)) {
input_report_abs(data->input_dev, ABS_HAT0X, rbuf[9]);
input_report_abs(data->input_dev, ABS_HAT0Y, rbuf[10]);
input_report_abs(data->input_dev, ABS_BRAKE, rbuf[11]);
}
input_sync(data->input_dev);
}
static int AKECS_GetOpenStatus(void)
{
wait_event_interruptible(open_wq, (atomic_read(&open_flag) != 0));
return atomic_read(&open_flag);
}
static int AKECS_GetCloseStatus(void)
{
wait_event_interruptible(open_wq, (atomic_read(&open_flag) <= 0));
return atomic_read(&open_flag);
}
static void AKECS_CloseDone(void)
{
atomic_set(&m_flag, 1);
atomic_set(&a_flag, 1);
atomic_set(&t_flag, 1);
atomic_set(&mv_flag, 1);
}
static int akm_aot_open(struct inode *inode, struct file *file)
{
int ret = -1;
if (atomic_cmpxchg(&open_count, 0, 1) == 0) {
if (atomic_cmpxchg(&open_flag, 0, 1) == 0) {
atomic_set(&reserve_open_flag, 1);
wake_up(&open_wq);
ret = 0;
}
}
return ret;
}
static int akm_aot_release(struct inode *inode, struct file *file)
{
atomic_set(&reserve_open_flag, 0);
atomic_set(&open_flag, 0);
atomic_set(&open_count, 0);
wake_up(&open_wq);
return 0;
}
static int
akm_aot_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
void __user *argp = (void __user *)arg;
short flag;
switch (cmd) {
case ECS_IOCTL_APP_SET_MFLAG:
case ECS_IOCTL_APP_SET_AFLAG:
case ECS_IOCTL_APP_SET_TFLAG:
case ECS_IOCTL_APP_SET_MVFLAG:
if (copy_from_user(&flag, argp, sizeof(flag)))
return -EFAULT;
if (flag < 0 || flag > 1)
return -EINVAL;
break;
case ECS_IOCTL_APP_SET_DELAY:
if (copy_from_user(&flag, argp, sizeof(flag)))
return -EFAULT;
break;
default:
break;
}
switch (cmd) {
case ECS_IOCTL_APP_SET_MFLAG:
atomic_set(&m_flag, flag);
break;
case ECS_IOCTL_APP_GET_MFLAG:
flag = atomic_read(&m_flag);
break;
case ECS_IOCTL_APP_SET_AFLAG:
atomic_set(&a_flag, flag);
break;
case ECS_IOCTL_APP_GET_AFLAG:
flag = atomic_read(&a_flag);
break;
case ECS_IOCTL_APP_SET_TFLAG:
atomic_set(&t_flag, flag);
break;
case ECS_IOCTL_APP_GET_TFLAG:
flag = atomic_read(&t_flag);
break;
case ECS_IOCTL_APP_SET_MVFLAG:
atomic_set(&mv_flag, flag);
break;
case ECS_IOCTL_APP_GET_MVFLAG:
flag = atomic_read(&mv_flag);
break;
case ECS_IOCTL_APP_SET_DELAY:
akmd_delay = flag;
break;
case ECS_IOCTL_APP_GET_DELAY:
flag = akmd_delay;
break;
default:
return -ENOTTY;
}
switch (cmd) {
case ECS_IOCTL_APP_GET_MFLAG:
case ECS_IOCTL_APP_GET_AFLAG:
case ECS_IOCTL_APP_GET_TFLAG:
case ECS_IOCTL_APP_GET_MVFLAG:
case ECS_IOCTL_APP_GET_DELAY:
if (copy_to_user(argp, &flag, sizeof(flag)))
return -EFAULT;
break;
default:
break;
}
return 0;
}
static int akmd_open(struct inode *inode, struct file *file)
{
return nonseekable_open(inode, file);
}
static int akmd_release(struct inode *inode, struct file *file)
{
AKECS_CloseDone();
return 0;
}
static int
akmd_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
unsigned long arg)
{
void __user *argp = (void __user *)arg;
char msg[RBUFF_SIZE + 1], rwbuf[5];
int ret = -1, status;
short mode, value[12], delay;
switch (cmd) {
case ECS_IOCTL_WRITE:
case ECS_IOCTL_READ:
if (copy_from_user(&rwbuf, argp, sizeof(rwbuf)))
return -EFAULT;
break;
case ECS_IOCTL_SET_MODE:
if (copy_from_user(&mode, argp, sizeof(mode)))
return -EFAULT;
break;
case ECS_IOCTL_SET_YPR:
if (copy_from_user(&value, argp, sizeof(value)))
return -EFAULT;
break;
default:
break;
}
switch (cmd) {
case ECS_IOCTL_WRITE:
if (rwbuf[0] < 2)
return -EINVAL;
ret = AKI2C_TxData(&rwbuf[1], rwbuf[0]);
if (ret < 0)
return ret;
break;
case ECS_IOCTL_READ:
if (rwbuf[0] < 1)
return -EINVAL;
ret = AKI2C_RxData(&rwbuf[1], rwbuf[0]);
if (ret < 0)
return ret;
break;
case ECS_IOCTL_SET_MODE:
ret = AKECS_SetMode((char)mode);
if (ret < 0)
return ret;
break;
case ECS_IOCTL_GETDATA:
ret = AKECS_TransRBuff(msg, RBUFF_SIZE);
if (ret < 0)
return ret;
break;
case ECS_IOCTL_SET_YPR:
AKECS_Report_Value(value);
break;
case ECS_IOCTL_GET_OPEN_STATUS:
status = AKECS_GetOpenStatus();
break;
case ECS_IOCTL_GET_CLOSE_STATUS:
status = AKECS_GetCloseStatus();
break;
case ECS_IOCTL_GET_DELAY:
delay = akmd_delay;
break;
default:
return -ENOTTY;
}
switch (cmd) {
case ECS_IOCTL_READ:
if (copy_to_user(argp, &rwbuf, sizeof(rwbuf)))
return -EFAULT;
break;
case ECS_IOCTL_GETDATA:
if (copy_to_user(argp, &msg, sizeof(msg)))
return -EFAULT;
break;
case ECS_IOCTL_GET_OPEN_STATUS:
case ECS_IOCTL_GET_CLOSE_STATUS:
if (copy_to_user(argp, &status, sizeof(status)))
return -EFAULT;
break;
case ECS_IOCTL_GET_DELAY:
if (copy_to_user(argp, &delay, sizeof(delay)))
return -EFAULT;
break;
default:
break;
}
return 0;
}
static void akm_work_func(struct work_struct *work)
{
if (AKECS_GetData() < 0)
printk(KERN_ERR "AKM8973 akm_work_func: Get data failed\n");
enable_irq(this_client->irq);
}
static irqreturn_t akm8973_interrupt(int irq, void *dev_id)
{
struct akm8973_data *data = dev_id;
disable_irq(this_client->irq);
schedule_work(&data->work);
return IRQ_HANDLED;
}
#ifdef CONFIG_HAS_EARLYSUSPEND
static void akm8973_early_suspend(struct early_suspend *handler)
{
atomic_set(&suspend_flag, 1);
atomic_set(&reserve_open_flag, atomic_read(&open_flag));
atomic_set(&open_flag, 0);
wake_up(&open_wq);
disable_irq(this_client->irq);
}
static void akm8973_early_resume(struct early_suspend *handler)
{
enable_irq(this_client->irq);
atomic_set(&suspend_flag, 0);
atomic_set(&open_flag, atomic_read(&reserve_open_flag));
wake_up(&open_wq);
}
#endif
static struct file_operations akmd_fops = {
.owner = THIS_MODULE,
.open = akmd_open,
.release = akmd_release,
.ioctl = akmd_ioctl,
};
static struct file_operations akm_aot_fops = {
.owner = THIS_MODULE,
.open = akm_aot_open,
.release = akm_aot_release,
.ioctl = akm_aot_ioctl,
};
static struct miscdevice akm_aot_device = {
.minor = MISC_DYNAMIC_MINOR,
.name = "akm8973_aot",
.fops = &akm_aot_fops,
};
static struct miscdevice akmd_device = {
.minor = MISC_DYNAMIC_MINOR,
.name = "akm8973_daemon",
.fops = &akmd_fops,
};
static ssize_t compass_reset_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int val;
val = -1;
sscanf(buf, "%u", &val);
if (val != 1)
return -EINVAL;
return count;
}
static DEVICE_ATTR(reset, 0644, NULL, compass_reset_store);
int akm8973_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
struct akm8973_data *akm;
int err = 0;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
err = -ENODEV;
goto exit_check_functionality_failed;
}
akm = kzalloc(sizeof(struct akm8973_data), GFP_KERNEL);
if (!akm) {
err = -ENOMEM;
goto exit_alloc_data_failed;
}
INIT_WORK(&akm->work, akm_work_func);
i2c_set_clientdata(client, akm);
this_client = client;
err = AKECS_PowerDown();
if (err < 0) {
printk(KERN_ERR"AKM8973 akm8973_probe: set power down mode error\n");
goto exit_set_mode_failed;
}
err = request_irq(client->irq, akm8973_interrupt, IRQF_TRIGGER_HIGH,
"akm8973", akm);
if (err < 0) {
printk(KERN_ERR"AKM8973 akm8973_probe: request irq failed\n");
goto exit_irq_request_failed;
}
akm->input_dev = input_allocate_device();
if (!akm->input_dev) {
err = -ENOMEM;
printk(KERN_ERR
"AKM8973 akm8973_probe: Failed to allocate input device\n");
goto exit_input_dev_alloc_failed;
}
set_bit(EV_ABS, akm->input_dev->evbit);
/* yaw */
input_set_abs_params(akm->input_dev, ABS_RX, 0, 360, 0, 0);
/* pitch */
input_set_abs_params(akm->input_dev, ABS_RY, -180, 180, 0, 0);
/* roll */
input_set_abs_params(akm->input_dev, ABS_RZ, -90, 90, 0, 0);
/* x-axis acceleration */
input_set_abs_params(akm->input_dev, ABS_X, -1872, 1872, 0, 0);
/* y-axis acceleration */
input_set_abs_params(akm->input_dev, ABS_Y, -1872, 1872, 0, 0);
/* z-axis acceleration */
input_set_abs_params(akm->input_dev, ABS_Z, -1872, 1872, 0, 0);
/* temparature */
input_set_abs_params(akm->input_dev, ABS_THROTTLE, -30, 85, 0, 0);
/* status of magnetic sensor */
input_set_abs_params(akm->input_dev, ABS_RUDDER, -32768, 3, 0, 0);
/* status of acceleration sensor */
input_set_abs_params(akm->input_dev, ABS_WHEEL, -32768, 3, 0, 0);
/* step count */
input_set_abs_params(akm->input_dev, ABS_GAS, 0, 65535, 0, 0);
/* x-axis of raw magnetic vector */
input_set_abs_params(akm->input_dev, ABS_HAT0X, -2048, 2032, 0, 0);
/* y-axis of raw magnetic vector */
input_set_abs_params(akm->input_dev, ABS_HAT0Y, -2048, 2032, 0, 0);
/* z-axis of raw magnetic vector */
input_set_abs_params(akm->input_dev, ABS_BRAKE, -2048, 2032, 0, 0);
akm->input_dev->name = "compass";
err = input_register_device(akm->input_dev);
if (err) {
printk(KERN_ERR
"AKM8973 akm8973_probe: Unable to register input device: %s\n",
akm->input_dev->name);
goto exit_input_register_device_failed;
}
err = misc_register(&akmd_device);
if (err) {
printk(KERN_ERR "AKM8973 akm8973_probe: akmd_device register failed\n");
goto exit_misc_device_register_failed;
}
err = misc_register(&akm_aot_device);
if (err) {
printk(KERN_ERR
"AKM8973 akm8973_probe: akm_aot_device register failed\n");
goto exit_misc_device_register_failed;
}
mutex_init(&sense_data_mutex);
init_waitqueue_head(&data_ready_wq);
init_waitqueue_head(&open_wq);
/* As default, report all information */
atomic_set(&m_flag, 1);
atomic_set(&a_flag, 1);
atomic_set(&t_flag, 1);
atomic_set(&mv_flag, 1);
#ifdef CONFIG_HAS_EARLYSUSPEND
akm->early_suspend_akm.suspend = akm8973_early_suspend;
akm->early_suspend_akm.resume = akm8973_early_resume;
register_early_suspend(&akm->early_suspend_akm);
#endif
err = device_create_file(&client->dev, &dev_attr_reset);
if (err)
printk(KERN_ERR
"AKM8973 akm8973_probe: create dev_attr_reset failed\n");
return 0;
exit_misc_device_register_failed:
exit_input_register_device_failed:
input_free_device(akm->input_dev);
exit_input_dev_alloc_failed:
free_irq(client->irq, akm);
exit_irq_request_failed:
exit_set_mode_failed:
kfree(akm);
exit_alloc_data_failed:
exit_check_functionality_failed:
return err;
}
static int akm8973_remove(struct i2c_client *client)
{
struct akm8973_data *akm = i2c_get_clientdata(client);
free_irq(client->irq, akm);
input_unregister_device(akm->input_dev);
kfree(akm);
return 0;
}
static const struct i2c_device_id akm8973_id[] = {
{ AKM8973_I2C_NAME, 0 },
{ }
};
static struct i2c_driver akm8973_driver = {
.probe = akm8973_probe,
.remove = akm8973_remove,
.id_table = akm8973_id,
.driver = {
.name = AKM8973_I2C_NAME,
},
};
static int __init akm8973_init(void)
{
printk(KERN_INFO "AKM8973 compass driver: init\n");
return i2c_add_driver(&akm8973_driver);
}
static void __exit akm8973_exit(void)
{
i2c_del_driver(&akm8973_driver);
}
module_init(akm8973_init);
module_exit(akm8973_exit);
MODULE_AUTHOR("viral wang <viral_wang@htc.com>");
MODULE_DESCRIPTION("AKM8973 compass driver");
MODULE_LICENSE("GPL");

53
drivers/staging/iio/magnetometer/ak8973.h Normal file
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/*
* Definitions for ak8973 compass chip.
*/
#ifndef AKM8973_H
#define AKM8973_H
#include <linux/ioctl.h>
#define AKM8973_I2C_NAME "ak8973"
/* Compass device dependent definition */
#define AKECS_MODE_MEASURE 0x00 /* Starts measurement. Please use AKECS_MODE_MEASURE_SNG */
/* or AKECS_MODE_MEASURE_SEQ instead of this. */
#define AKECS_MODE_E2P_READ 0x02 /* E2P access mode (read). */
#define AKECS_MODE_POWERDOWN 0x03 /* Power down mode */
#define RBUFF_SIZE 4 /* Rx buffer size */
/* AK8973 register address */
#define AKECS_REG_ST 0xC0
#define AKECS_REG_TMPS 0xC1
#define AKECS_REG_MS1 0xE0
#define AKMIO 0xA1
/* IOCTLs for AKM library */
#define ECS_IOCTL_WRITE _IOW(AKMIO, 0x01, char[5])
#define ECS_IOCTL_READ _IOWR(AKMIO, 0x02, char[5])
#define ECS_IOCTL_RESET _IO(AKMIO, 0x03)
#define ECS_IOCTL_SET_MODE _IOW(AKMIO, 0x04, short)
#define ECS_IOCTL_GETDATA _IOR(AKMIO, 0x05, char[RBUFF_SIZE+1])
#define ECS_IOCTL_SET_YPR _IOW(AKMIO, 0x06, short[12])
#define ECS_IOCTL_GET_OPEN_STATUS _IOR(AKMIO, 0x07, int)
#define ECS_IOCTL_GET_CLOSE_STATUS _IOR(AKMIO, 0x08, int)
#define ECS_IOCTL_GET_DELAY _IOR(AKMIO, 0x30, short)
/* IOCTLs for APPs */
#define ECS_IOCTL_APP_SET_MODE _IOW(AKMIO, 0x10, short)
#define ECS_IOCTL_APP_SET_MFLAG _IOW(AKMIO, 0x11, short)
#define ECS_IOCTL_APP_GET_MFLAG _IOW(AKMIO, 0x12, short)
#define ECS_IOCTL_APP_SET_AFLAG _IOW(AKMIO, 0x13, short)
#define ECS_IOCTL_APP_GET_AFLAG _IOR(AKMIO, 0x14, short)
#define ECS_IOCTL_APP_SET_TFLAG _IOR(AKMIO, 0x15, short)
#define ECS_IOCTL_APP_GET_TFLAG _IOR(AKMIO, 0x16, short)
#define ECS_IOCTL_APP_RESET_PEDOMETER _IO(AKMIO, 0x17)
#define ECS_IOCTL_APP_SET_DELAY _IOW(AKMIO, 0x18, short)
#define ECS_IOCTL_APP_GET_DELAY ECS_IOCTL_GET_DELAY
#define ECS_IOCTL_APP_SET_MVFLAG _IOW(AKMIO, 0x19, short) /* Set raw magnetic vector flag */
#define ECS_IOCTL_APP_GET_MVFLAG _IOR(AKMIO, 0x1A, short) /* Get raw magnetic vector flag */
#endif

501
drivers/staging/iio/magnetometer/ak8975.c Normal file
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/*
* A sensor driver for the magnetometer AK8975.
*
* Magnetic compass sensor driver for monitoring magnetic flux information.
*
* Copyright (c) 2010, NVIDIA Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include "../iio.h"
#include "magnet.h"
/*
* Register definitions, as well as various shifts and masks to get at the
* individual fields of the registers.
*/
#define AK8975_REG_WIA 0x00
#define AK8975_DEVICE_ID 0x48
#define AK8975_REG_INFO 0x01
#define AK8975_REG_ST1 0x02
#define AK8975_REG_ST1_DRDY_SHIFT 0
#define AK8975_REG_ST1_DRDY_MASK (1 << AK8975_REG_ST1_DRDY_SHIFT)
#define AK8975_REG_HXL 0x03
#define AK8975_REG_HXH 0x04
#define AK8975_REG_HYL 0x05
#define AK8975_REG_HYH 0x06
#define AK8975_REG_HZL 0x07
#define AK8975_REG_HZH 0x08
#define AK8975_REG_ST2 0x09
#define AK8975_REG_ST2_DERR_SHIFT 2
#define AK8975_REG_ST2_DERR_MASK (1 << AK8975_REG_ST2_DERR_SHIFT)
#define AK8975_REG_ST2_HOFL_SHIFT 3
#define AK8975_REG_ST2_HOFL_MASK (1 << AK8975_REG_ST2_HOFL_SHIFT)
#define AK8975_REG_CNTL 0x0A
#define AK8975_REG_CNTL_MODE_SHIFT 0
#define AK8975_REG_CNTL_MODE_MASK (0xF << AK8975_REG_CNTL_MODE_SHIFT)
#define AK8975_REG_CNTL_MODE_POWER_DOWN 0
#define AK8975_REG_CNTL_MODE_ONCE 1
#define AK8975_REG_CNTL_MODE_SELF_TEST 8
#define AK8975_REG_CNTL_MODE_FUSE_ROM 0xF
#define AK8975_REG_RSVC 0x0B
#define AK8975_REG_ASTC 0x0C
#define AK8975_REG_TS1 0x0D
#define AK8975_REG_TS2 0x0E
#define AK8975_REG_I2CDIS 0x0F
#define AK8975_REG_ASAX 0x10
#define AK8975_REG_ASAY 0x11
#define AK8975_REG_ASAZ 0x12
#define AK8975_MAX_REGS AK8975_REG_ASAZ
/*
* Miscellaneous values.
*/
#define AK8975_MAX_CONVERSION_TRIAL 5
#define AK8975_MAX_CONVERSION_TIMEOUT 500
#define AK8975_CONVERSION_DONE_POLL_TIME 10
/*
* Per-instance context data for the device.
*/
struct ak8975_data {
struct i2c_client *client;
struct iio_dev *indio_dev;
struct attribute_group attrs;
struct mutex lock;
u8 asa[3];
unsigned long mode;
u8 reg_cache[AK8975_MAX_REGS];
int eoc_gpio;
int eoc_irq;
};
/*
* Helper function to write to the I2C device's registers.
*/
static bool ak8975_write_data(struct i2c_client *client,
u8 reg, u8 val, u8 mask, u8 shift)
{
u8 regval;
struct i2c_msg msg;
u8 w_data[2];
int ret = 0;
struct ak8975_data *data = i2c_get_clientdata(client);
regval = data->reg_cache[reg];
regval &= ~mask;
regval |= val << shift;
w_data[0] = reg;
w_data[1] = regval;
msg.addr = client->addr;
msg.flags = 0;
msg.len = 2;
msg.buf = w_data;
ret = i2c_transfer(client->adapter, &msg, 1);
if (ret < 0) {
dev_err(&client->dev, "Write to device fails status %x\n", ret);
return false;
}
data->reg_cache[reg] = regval;
return true;
}
/*
* Helper function to read a contiguous set of the I2C device's registers.
*/
static bool ak8975_read_data(struct i2c_client *client,
u8 reg, u8 length, u8 *buffer)
{
struct i2c_msg msg[2];
u8 w_data[2];
int ret = 0;
w_data[0] = reg;
msg[0].addr = client->addr;
msg[0].flags = I2C_M_NOSTART; /* set repeated start and write */
msg[0].len = 1;
msg[0].buf = w_data;
msg[1].addr = client->addr;
msg[1].flags = I2C_M_RD;
msg[1].len = length;
msg[1].buf = buffer;
ret = i2c_transfer(client->adapter, msg, 2);
if (ret < 0) {
dev_err(&client->dev, "Read from device fails\n");
return false;
}
return true;
}
/*
* Perform some start-of-day setup, including reading the asa calibration
* values and caching them.
*/
static int ak8975_setup(struct i2c_client *client)
{
struct ak8975_data *data = i2c_get_clientdata(client);
u8 device_id;
u8 buffer[3];
bool status;
/* Confirm that the device we're talking to is really an AK8975. */
status = ak8975_read_data(client, AK8975_REG_WIA, 1, &device_id);
if ((!status) || (device_id != AK8975_DEVICE_ID)) {
dev_err(&client->dev, "Device ak8975 not found\n");
return -ENODEV;
}
/* Write the fused rom access mode. */
status = ak8975_write_data(client, AK8975_REG_CNTL, AK8975_REG_CNTL_MODE_FUSE_ROM, AK8975_REG_CNTL_MODE_MASK, AK8975_REG_CNTL_MODE_SHIFT);
if (!status) {
dev_err(&client->dev, "Error in setting fuse access mode\n");
return false;
}
/* Get asa data and store in the device data. */
status = ak8975_read_data(client, AK8975_REG_ASAX, 3, buffer);
if (!status) {
dev_err(&client->dev, "Not able to read asa data\n");
return -ENODEV;
}
data->asa[0] = buffer[0] & 0xFF;
data->asa[1] = buffer[1] & 0xFF;
data->asa[2] = buffer[2] & 0xFF;
return 0;
}
/*
* Shows the device's mode. 0 = off, 1 = on.
*/
static ssize_t show_mode(struct device *dev, struct device_attribute *devattr,
char *buf)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ak8975_data *data = indio_dev->dev_data;
return sprintf(buf, "%lu\n", data->mode);
}
/*
* Sets the device's mode. 0 = off, 1 = on. The device's mode must be on
* for the magn raw attributes to be available.
*/
static ssize_t store_mode(struct device *dev, struct device_attribute *devattr,
const char *buf, size_t count)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ak8975_data *data = indio_dev->dev_data;
struct i2c_client *client = data->client;
unsigned long oval;
bool status;
/* Convert mode string and do some basic sanity checking on it.
only 0 or 1 are valid. */
if (strict_strtol(buf, 10, &oval))
return -EINVAL;
if ((oval < 0) || (oval > 1)) {
dev_err(dev, "mode value is not supported\n");
return -EINVAL;
}
mutex_lock(&data->lock);
/* Write the mode to the device. */
if (data->mode != oval) {
status = ak8975_write_data(client, AK8975_REG_CNTL, (u8)oval, AK8975_REG_CNTL_MODE_MASK, AK8975_REG_CNTL_MODE_SHIFT);
if (!status) {
dev_err(&client->dev, "Error in setting mode\n");
mutex_unlock(&data->lock);
return -EINVAL;
}
data->mode = oval;
}
mutex_unlock(&data->lock);
return count;
}
/*
* Emits the ASA sensitivity adjustment value for the x, y, or z axis.
* These ASA values are read from the sensor device at start of day, and
* cached in the device context struct.
*/
static ssize_t show_calibscale(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ak8975_data *data = indio_dev->dev_data;
struct iio_dev_attr *this_attr = to_iio_dev_attr(devattr);
if (!data) {
dev_err(dev, "No device found\n");
return -ENODEV;
}
return sprintf(buf, "%d\n", data->asa[this_attr->address]);
}
/*
* Emits the raw flux value for the x, y, or z axis.
*
* Adjusting the flux value with the sensitivity adjustment value should be
* done via the following formula:
*
* Hadj = H * ( ( ( (ASA-128)*0.5 ) / 128 ) + 1 )
*
* where H is the raw value, ASA is the sensitivity adjustment, and Hadj
* is the resultant adjusted value.
*/
static ssize_t show_raw(struct device *dev, struct device_attribute *devattr,
char *buf)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ak8975_data *data = indio_dev->dev_data;
struct i2c_client *client = data->client;
struct iio_dev_attr *this_attr = to_iio_dev_attr(devattr);
u32 timeout_ms = AK8975_MAX_CONVERSION_TIMEOUT;
u16 meas_reg;
s16 raw;
u8 read_status;
bool status;
int state;
/* Set up the device for taking a sample. */
status = ak8975_write_data(client, AK8975_REG_CNTL, AK8975_REG_CNTL_MODE_ONCE, AK8975_REG_CNTL_MODE_MASK, AK8975_REG_CNTL_MODE_SHIFT);
if (!status) {
dev_err(&client->dev, "Error in setting operating mode\n");
return false;
}
/* Wait for the conversion to complete. */
while (timeout_ms) {
msleep(AK8975_CONVERSION_DONE_POLL_TIME);
state = (gpio_get_value(data->eoc_gpio) ? 1 : 0);
if (state)
break;
timeout_ms -= AK8975_CONVERSION_DONE_POLL_TIME;
}
if (!timeout_ms) {
dev_err(&client->dev, "Conversion timeout happend\n");
return false;
}
status = ak8975_read_data(client, AK8975_REG_ST1, 1, &read_status);
if (!status) {
dev_err(&client->dev, "Error in reading ST1\n");
return false;
}
if (read_status & AK8975_REG_ST1_DRDY_MASK) {
status = ak8975_read_data(client, AK8975_REG_ST2, 1, &read_status);
if (!status) {
dev_err(&client->dev, "Error in reading ST2\n");
return false;
}
if (read_status & (AK8975_REG_ST2_DERR_MASK | AK8975_REG_ST2_HOFL_MASK)) {
dev_err(&client->dev, "ST2 status error 0x%x\n",
read_status);
return false;
}
}
/* Read the flux value from the appropriate register
(the register is specified in the iio device attributes). */
status = ak8975_read_data(client, this_attr->address, 2,
(u8 *)&meas_reg);
if (!status) {
dev_err(&client->dev, "Read axis data fails\n");
return false;
}
/* Endian conversion of the measured values */
raw = (s16) (le16_to_cpu(meas_reg));
return sprintf(buf, "%d\n", raw);
}
static IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR, show_mode, store_mode, 0);
static IIO_DEVICE_ATTR(magn_x_calibscale, S_IRUGO, show_calibscale, NULL, 0);
static IIO_DEVICE_ATTR(magn_y_calibscale, S_IRUGO, show_calibscale, NULL, 1);
static IIO_DEVICE_ATTR(magn_z_calibscale, S_IRUGO, show_calibscale, NULL, 2);
static IIO_DEV_ATTR_MAGN_X(show_raw, AK8975_REG_HXL);
static IIO_DEV_ATTR_MAGN_Y(show_raw, AK8975_REG_HYL);
static IIO_DEV_ATTR_MAGN_Z(show_raw, AK8975_REG_HZL);
static struct attribute *ak8975_attr[] = {
&iio_dev_attr_mode.dev_attr.attr,
&iio_dev_attr_magn_x_calibscale.dev_attr.attr,
&iio_dev_attr_magn_y_calibscale.dev_attr.attr,
&iio_dev_attr_magn_z_calibscale.dev_attr.attr,
&iio_dev_attr_magn_x_raw.dev_attr.attr,
&iio_dev_attr_magn_y_raw.dev_attr.attr,
&iio_dev_attr_magn_z_raw.dev_attr.attr,
NULL
};
static struct attribute_group ak8975_attr_group = {
.attrs = ak8975_attr,
};
static int ak8975_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct ak8975_data *data;
int err;
/* Allocate our device context. */
data = kzalloc(sizeof(struct ak8975_data), GFP_KERNEL);
if (!data) {
dev_err(&client->dev, "Memory allocation fails\n");
err = -ENOMEM;
goto exit;
}
i2c_set_clientdata(client, data);
data->client = client;
mutex_init(&data->lock);
/* Grab and set up the supplied GPIO. */
data->eoc_irq = client->irq;
data->eoc_gpio = irq_to_gpio(client->irq);
err = gpio_request(data->eoc_gpio, "ak_8975");
if (err < 0) {
dev_err(&client->dev, "failed to request GPIO %d, error %d\n",
data->eoc_gpio, err);
goto exit_free;
}
err = gpio_direction_input(data->eoc_gpio);
if (err < 0) {
dev_err(&client->dev, "Failed to configure input direction for GPIO %d, error %d\n", data->eoc_gpio, err);
gpio_free(data->eoc_gpio);
goto exit_gpio;
}
/* Perform some basic start-of-day setup of the device. */
err = ak8975_setup(client);
if (err < 0) {
dev_err(&client->dev, "AK8975 initialization fails\n");
goto exit_gpio;
}
/* Register with IIO */
data->indio_dev = iio_allocate_device();
if (data->indio_dev == NULL) {
err = -ENOMEM;
goto exit_gpio;
}
data->indio_dev->dev.parent = &client->dev;
data->indio_dev->attrs = &ak8975_attr_group;
data->indio_dev->dev_data = (void *)(data);
data->indio_dev->driver_module = THIS_MODULE;
data->indio_dev->modes = INDIO_DIRECT_MODE;
err = iio_device_register(data->indio_dev);
if (err < 0)
goto exit_free_iio;
return 0;
exit_free_iio:
iio_free_device(data->indio_dev);
exit_gpio:
gpio_free(data->eoc_gpio);
exit_free:
kfree(data);
exit:
return err;
}
static int ak8975_remove(struct i2c_client *client)
{
struct ak8975_data *data = i2c_get_clientdata(client);
iio_device_unregister(data->indio_dev);
iio_free_device(data->indio_dev);
gpio_free(data->eoc_gpio);
kfree(data);
return 0;
}
static const struct i2c_device_id ak8975_id[] = {
{"ak8975", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, ak8975_id);
static struct i2c_driver ak8975_driver = {
.driver = {
.name = "ak8975",
},
.probe = ak8975_probe,
.remove = __devexit_p(ak8975_remove),
.id_table = ak8975_id,
};
static int __init ak8975_init(void)
{
return i2c_add_driver(&ak8975_driver);
}
static void __exit ak8975_exit(void)
{
i2c_del_driver(&ak8975_driver);
}
module_init(ak8975_init);
module_exit(ak8975_exit);
MODULE_AUTHOR("Laxman Dewangan <ldewangan [at] nvidia>");
MODULE_DESCRIPTION("AK8975 magnetometer driver");
MODULE_LICENSE("GPL");

31
drivers/staging/iio/magnetometer/magnet.h Normal file
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#include "../sysfs.h"
/* Magnetometer types of attribute */
#define IIO_DEV_ATTR_MAGN_X_OFFSET(_mode, _show, _store, _addr) \
IIO_DEVICE_ATTR(magn_x_offset, _mode, _show, _store, _addr)
#define IIO_DEV_ATTR_MAGN_Y_OFFSET(_mode, _show, _store, _addr) \
IIO_DEVICE_ATTR(magn_y_offset, _mode, _show, _store, _addr)
#define IIO_DEV_ATTR_MAGN_Z_OFFSET(_mode, _show, _store, _addr) \
IIO_DEVICE_ATTR(magn_z_offset, _mode, _show, _store, _addr)
#define IIO_DEV_ATTR_MAGN_X_GAIN(_mode, _show, _store, _addr) \
IIO_DEVICE_ATTR(magn_x_gain, _mode, _show, _store, _addr)
#define IIO_DEV_ATTR_MAGN_Y_GAIN(_mode, _show, _store, _addr) \
IIO_DEVICE_ATTR(magn_y_gain, _mode, _show, _store, _addr)
#define IIO_DEV_ATTR_MAGN_Z_GAIN(_mode, _show, _store, _addr) \
IIO_DEVICE_ATTR(magn_z_gain, _mode, _show, _store, _addr)
#define IIO_DEV_ATTR_MAGN_X(_show, _addr) \
IIO_DEVICE_ATTR(magn_x_raw, S_IRUGO, _show, NULL, _addr)
#define IIO_DEV_ATTR_MAGN_Y(_show, _addr) \
IIO_DEVICE_ATTR(magn_y_raw, S_IRUGO, _show, NULL, _addr)
#define IIO_DEV_ATTR_MAGN_Z(_show, _addr) \
IIO_DEVICE_ATTR(magn_z_raw, S_IRUGO, _show, NULL, _addr)