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Date: Sun, 19 Jul 2015 14:43:34 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Martin Kepplinger <martink@...teo.de>, knaack.h@....de,
lars@...afoo.de, pmeerw@...erw.net, mfuzzey@...keon.com,
roberta.dobrescu@...il.com, robh+dt@...nel.org, pawel.moll@....com,
mark.rutland@....com, ijc+devicetree@...lion.org.uk,
galak@...eaurora.org
CC: devicetree@...r.kernel.org, linux-iio@...r.kernel.org,
linux-kernel@...r.kernel.org,
christoph.muellner@...obroma-systems.com,
Martin Kepplinger <martin.kepplinger@...obroma-systems.com>
Subject: Re: [PATCH 2/8] iio: mma8452: add support for MMA8453Q accelerometer
chip
On 06/07/15 13:34, Martin Kepplinger wrote:
> This adds support for the 10 bit version if Freescale's accelerometers
> of this series. The datasheet is available at Freescale's website:
>
> http://cache.freescale.com/files/sensors/doc/data_sheet/MMA8453Q.pdf
>
> Signed-off-by: Martin Kepplinger <martin.kepplinger@...obroma-systems.com>
> Signed-off-by: Christoph Muellner <christoph.muellner@...obroma-systems.com>
Again, looks good to me, but I'd like Peter / Martin's Acks ideally.
Jonathan
> ---
> drivers/iio/accel/Kconfig | 6 +++---
> drivers/iio/accel/mma8452.c | 38 +++++++++++++++++++++++++++++++++++---
> 2 files changed, 38 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
> index 00e7bcb..dc80dc9 100644
> --- a/drivers/iio/accel/Kconfig
> +++ b/drivers/iio/accel/Kconfig
> @@ -87,13 +87,13 @@ config KXSD9
> will be called kxsd9.
>
> config MMA8452
> - tristate "Freescale MMA8452Q Accelerometer Driver"
> + tristate "Freescale MMA8452Q and similar Accelerometers Driver"
> depends on I2C
> select IIO_BUFFER
> select IIO_TRIGGERED_BUFFER
> help
> - Say yes here to build support for the Freescale MMA8452Q 3-axis
> - accelerometer.
> + Say yes here to build support for the following Freescale 3-axis
> + accelerometers: MMA8452Q, MMA8453Q.
>
> To compile this driver as a module, choose M here: the module
> will be called mma8452.
> diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c
> index 8919bfb..71b40f7 100644
> --- a/drivers/iio/accel/mma8452.c
> +++ b/drivers/iio/accel/mma8452.c
> @@ -1,5 +1,8 @@
> /*
> - * mma8452.c - Support for Freescale MMA8452Q 3-axis 12-bit accelerometer
> + * mma8452.c - Support for following Freescale 3-axis accelerometers:
> + *
> + * MMA8452Q
> + * MMA8453Q
> *
> * Copyright 2014 Peter Meerwald <pmeerw@...erw.net>
> *
> @@ -27,7 +30,7 @@
>
> #define DRIVER_NAME "mma8452"
> #define MMA8452_STATUS 0x00
> -#define MMA8452_OUT_X 0x01 /* MSB first, 12-bit */
> +#define MMA8452_OUT_X 0x01 /* MSB first, 10 or 12-bit */
> #define MMA8452_OUT_Y 0x03
> #define MMA8452_OUT_Z 0x05
> #define MMA8452_INT_SRC 0x0c
> @@ -74,6 +77,7 @@
> #define MMA8452_INT_TRANS BIT(5)
>
> #define MMA8452_DEVICE_ID 0x2a
> +#define MMA8453_DEVICE_ID 0x3a
>
> struct mma8452_data {
> struct i2c_client *client;
> @@ -745,8 +749,16 @@ static const struct iio_chan_spec mma8452_channels[] = {
> IIO_CHAN_SOFT_TIMESTAMP(3),
> };
>
> +static const struct iio_chan_spec mma8453_channels[] = {
> + MMA8452_CHANNEL(X, 0, 10),
> + MMA8452_CHANNEL(Y, 1, 10),
> + MMA8452_CHANNEL(Z, 2, 10),
> + IIO_CHAN_SOFT_TIMESTAMP(3),
> +};
> +
> enum {
> mma8452,
> + mma8453,
> };
>
> static const struct mma_chip_info mma_chip_info_table[] = {
> @@ -773,7 +785,24 @@ static const struct mma_chip_info mma_chip_info_table[] = {
> .ev_ths_mask = MMA8452_TRANSIENT_THS_MASK,
> .ev_count = MMA8452_TRANSIENT_COUNT,
> },
> + [mma8453] = {
> + .chip_id = MMA8453_DEVICE_ID,
> + .channels = mma8453_channels,
> + .num_channels = ARRAY_SIZE(mma8453_channels),
> + .mma_scales = { {0, 38307}, {0, 76614}, {0, 153228} },
> + .ev_cfg = MMA8452_TRANSIENT_CFG,
> + .ev_cfg_ele = MMA8452_TRANSIENT_CFG_ELE,
> + .ev_cfg_chan_shift = 1,
> + .ev_src = MMA8452_TRANSIENT_SRC,
> + .ev_src_xe = MMA8452_TRANSIENT_SRC_XTRANSE,
> + .ev_src_ye = MMA8452_TRANSIENT_SRC_YTRANSE,
> + .ev_src_ze = MMA8452_TRANSIENT_SRC_ZTRANSE,
> + .ev_ths = MMA8452_TRANSIENT_THS,
> + .ev_ths_mask = MMA8452_TRANSIENT_THS_MASK,
> + .ev_count = MMA8452_TRANSIENT_COUNT,
> + },
> };
> +
> static struct attribute *mma8452_attributes[] = {
> &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
> &iio_dev_attr_in_accel_scale_available.dev_attr.attr,
> @@ -892,6 +921,7 @@ static int mma8452_reset(struct i2c_client *client)
>
> static const struct of_device_id mma8452_dt_ids[] = {
> { .compatible = "fsl,mma8452", .data = &mma_chip_info_table[mma8452] },
> + { .compatible = "fsl,mma8453", .data = &mma_chip_info_table[mma8453] },
> { }
> };
>
> @@ -906,7 +936,8 @@ static int mma8452_probe(struct i2c_client *client,
> ret = i2c_smbus_read_byte_data(client, MMA8452_WHO_AM_I);
> if (ret < 0)
> return ret;
> - if (ret != MMA8452_DEVICE_ID)
> +
> + if (ret != MMA8452_DEVICE_ID && ret != MMA8453_DEVICE_ID)
Perhaps switch this over to a switch statement to prepare for yet more
devices being supported in future?
> return -ENODEV;
>
> match = of_match_device(mma8452_dt_ids, &client->dev);
> @@ -1053,6 +1084,7 @@ static SIMPLE_DEV_PM_OPS(mma8452_pm_ops, mma8452_suspend, mma8452_resume);
>
> static const struct i2c_device_id mma8452_id[] = {
> { "mma8452", mma8452 },
> + { "mma8453", mma8453 },
> { }
> };
> MODULE_DEVICE_TABLE(i2c, mma8452_id);
>
--
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