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Input: mpu3050 - configure the sampling method

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This will improve the output of the sensor.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Heikki Krogerus 2011-12-24 00:09:04 -08:00 committed by Dmitry Torokhov
parent 3b5187248b
commit cd314fa637
1 changed files with 103 additions and 5 deletions
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108
drivers/input/misc/mpu3050.c
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@ -41,18 +41,67 @@
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#define MPU3050_CHIP_ID_REG 0x00
#define MPU3050_CHIP_ID 0x69
#define MPU3050_XOUT_H 0x1D
#define MPU3050_PWR_MGM 0x3E
#define MPU3050_PWR_MGM_POS 6
#define MPU3050_PWR_MGM_MASK 0x40
#define MPU3050_AUTO_DELAY 1000
#define MPU3050_MIN_VALUE -32768
#define MPU3050_MAX_VALUE 32767
#define MPU3050_DEFAULT_POLL_INTERVAL 200
#define MPU3050_DEFAULT_FS_RANGE 3
/* Register map */
#define MPU3050_CHIP_ID_REG 0x00
#define MPU3050_SMPLRT_DIV 0x15
#define MPU3050_DLPF_FS_SYNC 0x16
#define MPU3050_INT_CFG 0x17
#define MPU3050_XOUT_H 0x1D
#define MPU3050_PWR_MGM 0x3E
#define MPU3050_PWR_MGM_POS 6
/* Register bits */
/* DLPF_FS_SYNC */
#define MPU3050_EXT_SYNC_NONE 0x00
#define MPU3050_EXT_SYNC_TEMP 0x20
#define MPU3050_EXT_SYNC_GYROX 0x40
#define MPU3050_EXT_SYNC_GYROY 0x60
#define MPU3050_EXT_SYNC_GYROZ 0x80
#define MPU3050_EXT_SYNC_ACCELX 0xA0
#define MPU3050_EXT_SYNC_ACCELY 0xC0
#define MPU3050_EXT_SYNC_ACCELZ 0xE0
#define MPU3050_EXT_SYNC_MASK 0xE0
#define MPU3050_FS_250DPS 0x00
#define MPU3050_FS_500DPS 0x08
#define MPU3050_FS_1000DPS 0x10
#define MPU3050_FS_2000DPS 0x18
#define MPU3050_FS_MASK 0x18
#define MPU3050_DLPF_CFG_256HZ_NOLPF2 0x00
#define MPU3050_DLPF_CFG_188HZ 0x01
#define MPU3050_DLPF_CFG_98HZ 0x02
#define MPU3050_DLPF_CFG_42HZ 0x03
#define MPU3050_DLPF_CFG_20HZ 0x04
#define MPU3050_DLPF_CFG_10HZ 0x05
#define MPU3050_DLPF_CFG_5HZ 0x06
#define MPU3050_DLPF_CFG_2100HZ_NOLPF 0x07
#define MPU3050_DLPF_CFG_MASK 0x07
/* INT_CFG */
#define MPU3050_RAW_RDY_EN 0x01
#define MPU3050_MPU_RDY_EN 0x02
#define MPU3050_LATCH_INT_EN 0x04
/* PWR_MGM */
#define MPU3050_PWR_MGM_PLL_X 0x01
#define MPU3050_PWR_MGM_PLL_Y 0x02
#define MPU3050_PWR_MGM_PLL_Z 0x03
#define MPU3050_PWR_MGM_CLKSEL 0x07
#define MPU3050_PWR_MGM_STBY_ZG 0x08
#define MPU3050_PWR_MGM_STBY_YG 0x10
#define MPU3050_PWR_MGM_STBY_XG 0x20
#define MPU3050_PWR_MGM_SLEEP 0x40
#define MPU3050_PWR_MGM_RESET 0x80
#define MPU3050_PWR_MGM_MASK 0x40
struct axis_data {
s16 x;
s16 y;
@ -202,6 +251,51 @@ static irqreturn_t mpu3050_interrupt_thread(int irq, void *data)
return IRQ_HANDLED;
}
/**
* mpu3050_hw_init - initialize hardware
* @sensor: the sensor
*
* Called during device probe; configures the sampling method.
*/
static int __devinit mpu3050_hw_init(struct mpu3050_sensor *sensor)
{
struct i2c_client *client = sensor->client;
int ret;
u8 reg;
/* Reset */
ret = i2c_smbus_write_byte_data(client, MPU3050_PWR_MGM,
MPU3050_PWR_MGM_RESET);
if (ret < 0)
return ret;
ret = i2c_smbus_read_byte_data(client, MPU3050_PWR_MGM);
if (ret < 0)
return ret;
ret &= ~MPU3050_PWR_MGM_CLKSEL;
ret |= MPU3050_PWR_MGM_PLL_Z;
ret = i2c_smbus_write_byte_data(client, MPU3050_PWR_MGM, ret);
if (ret < 0)
return ret;
/* Output frequency divider. The poll interval */
ret = i2c_smbus_write_byte_data(client, MPU3050_SMPLRT_DIV,
MPU3050_DEFAULT_POLL_INTERVAL - 1);
if (ret < 0)
return ret;
/* Set low pass filter and full scale */
reg = MPU3050_DEFAULT_FS_RANGE;
reg |= MPU3050_DLPF_CFG_42HZ << 3;
reg |= MPU3050_EXT_SYNC_NONE << 5;
ret = i2c_smbus_write_byte_data(client, MPU3050_DLPF_FS_SYNC, reg);
if (ret < 0)
return ret;
return 0;
}
/**
* mpu3050_probe - device detection callback
* @client: i2c client of found device
@ -267,6 +361,10 @@ static int __devinit mpu3050_probe(struct i2c_client *client,
pm_runtime_set_active(&client->dev);
error = mpu3050_hw_init(sensor);
if (error)
goto err_pm_set_suspended;
error = request_threaded_irq(client->irq,
NULL, mpu3050_interrupt_thread,
IRQF_TRIGGER_RISING,