Input: mpu3050 - configure the sampling method
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>
diff --git a/drivers/input/misc/mpu3050.c b/drivers/input/misc/mpu3050.c
index ebec0ba..208d1a1 100644
--- a/drivers/input/misc/mpu3050.c
+++ b/drivers/input/misc/mpu3050.c
@@ -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;
@@ -203,6 +252,51 @@
}
/**
+ * 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
* @id: id match information
@@ -267,6 +361,10 @@
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,