From 2a17698c0e23f3548db2c698e0da80a00814361d Mon Sep 17 00:00:00 2001 From: Martin Fuzzey Date: Wed, 13 May 2015 12:26:40 +0200 Subject: [PATCH] iio: mma8452: Add access to registers via DebugFS Signed-off-by: Martin Fuzzey Signed-off-by: Jonathan Cameron --- drivers/iio/accel/mma8452.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c index 001a7dbc863c..877ce2954196 100644 --- a/drivers/iio/accel/mma8452.c +++ b/drivers/iio/accel/mma8452.c @@ -34,6 +34,8 @@ #define MMA8452_CTRL_REG2 0x2b #define MMA8452_CTRL_REG2_RST BIT(6) +#define MMA8452_MAX_REG 0x31 + #define MMA8452_STATUS_DRDY (BIT(2) | BIT(1) | BIT(0)) #define MMA8452_CTRL_DR_MASK (BIT(5) | BIT(4) | BIT(3)) @@ -292,6 +294,28 @@ static irqreturn_t mma8452_trigger_handler(int irq, void *p) return IRQ_HANDLED; } +static int mma8452_reg_access_dbg(struct iio_dev *indio_dev, + unsigned reg, unsigned writeval, + unsigned *readval) +{ + int ret; + struct mma8452_data *data = iio_priv(indio_dev); + + if (reg > MMA8452_MAX_REG) + return -EINVAL; + + if (!readval) + return mma8452_change_config(data, reg, writeval); + + ret = i2c_smbus_read_byte_data(data->client, reg); + if (ret < 0) + return ret; + + *readval = ret; + + return 0; +} + #define MMA8452_CHANNEL(axis, idx) { \ .type = IIO_ACCEL, \ .modified = 1, \ @@ -331,6 +355,7 @@ static const struct iio_info mma8452_info = { .attrs = &mma8452_group, .read_raw = &mma8452_read_raw, .write_raw = &mma8452_write_raw, + .debugfs_reg_access = &mma8452_reg_access_dbg, .driver_module = THIS_MODULE, };