From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Subject: [PATCH 2/9] iio: mma8452: Add access to registers via DebugFS To: linux-iio@vger.kernel.org, Jonathan Cameron From: Martin Fuzzey Date: Thu, 19 Feb 2015 15:15:58 +0100 Message-ID: <20150219141558.27001.74884.stgit@localhost> In-Reply-To: <20150219141553.27001.18825.stgit@localhost> References: <20150219141553.27001.18825.stgit@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" List-ID: Signed-off-by: Martin Fuzzey --- 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 04a4f34..c46df4e 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 @@ done: 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 == NULL) { + ret = mma8452_change_config(data, reg, writeval); + } else { + ret = i2c_smbus_read_byte_data(data->client, reg); + if (ret < 0) + return ret; + *readval = ret; + ret = 0; + } + return ret; +} + #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, };