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SubjectRe: [PATCH v3 2/8] iio: common: cros_ec_sensors: move channels to core structure
On Tue, 18 Jun 2019 11:06:33 +0200
Fabien Lahoudere <fabien.lahoudere@collabora.com> wrote:

> To avoid code duplication, we move channels initialization in
> cros_ec_sensors_core.
>
> Signed-off-by: Fabien Lahoudere <fabien.lahoudere@collabora.com>
Hi Fabien,

In of itself a fairly minor gain in code sharing and at some slight
cost in readability. Still on balance worthwhile I think.
Minor stuff inline.

Thanks,

Jonathan

> ---
> .../common/cros_ec_sensors/cros_ec_sensors.c | 49 ++++++-------------
> .../cros_ec_sensors/cros_ec_sensors_core.c | 25 +++++++++-
> drivers/iio/light/cros_ec_light_prox.c | 42 ++++------------
> drivers/iio/pressure/cros_ec_baro.c | 38 +++-----------
> .../linux/iio/common/cros_ec_sensors_core.h | 24 ++++++++-
> 5 files changed, 78 insertions(+), 100 deletions(-)
>
> diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> index c59b0ab8fe7d..897dc83a3355 100644
> --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> @@ -28,8 +28,6 @@
> struct cros_ec_sensors_state {
> /* Shared by all sensors */
> struct cros_ec_sensors_core_state core;
> -
> - struct iio_chan_spec channels[CROS_EC_SENSORS_MAX_CHANNELS];
> };
>
> static int cros_ec_sensors_read(struct iio_dev *indio_dev,
> @@ -178,7 +176,6 @@ static int cros_ec_sensors_probe(struct platform_device *pdev)
> struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent);
> struct iio_dev *indio_dev;
> struct cros_ec_sensors_state *state;
> - struct iio_chan_spec *channel;
> int ret, i;
>
> if (!ec_dev || !ec_dev->ec_dev) {
> @@ -186,63 +183,49 @@ static int cros_ec_sensors_probe(struct platform_device *pdev)
> return -EINVAL;
> }
>
> - indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*state));
> - if (!indio_dev)
> - return -ENOMEM;
> -
> - ret = cros_ec_sensors_core_init(pdev, indio_dev, true);
> + ret = cros_ec_sensors_core_init(pdev, sizeof(*state),
> + CROS_EC_SENSORS_MAX_CHANNELS, true);
> if (ret)
> return ret;
>
> + indio_dev = platform_get_drvdata(pdev);
> state = iio_priv(indio_dev);
> - for (channel = state->channels, i = CROS_EC_SENSOR_X;
> - i < CROS_EC_SENSOR_MAX_AXIS; i++, channel++) {
> + for (i = CROS_EC_SENSOR_X; i < CROS_EC_SENSOR_MAX_AXIS; i++) {
> /* Common part */
> - channel->info_mask_separate =
> + cros_ec_core_channel_init(state->core.channels, i + 1);
Given this is kind of 'partially' initializing the channel, perhaps
we can name it as something that hints at that.

cros_ec_core_channel_common_init() or something like that?

> + state->core.channels[i + 1].info_mask_separate =
> BIT(IIO_CHAN_INFO_RAW) |
> BIT(IIO_CHAN_INFO_CALIBBIAS);
> - channel->info_mask_shared_by_all =
> + state->core.channels[i + 1].info_mask_shared_by_all =
> BIT(IIO_CHAN_INFO_SCALE) |
> BIT(IIO_CHAN_INFO_FREQUENCY) |
> BIT(IIO_CHAN_INFO_SAMP_FREQ);
> - channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
> - channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
> - channel->scan_index = i;
> - channel->ext_info = cros_ec_sensors_ext_info;
> - channel->modified = 1;
> - channel->channel2 = IIO_MOD_X + i;
> - channel->scan_type.sign = 's';
> + state->core.channels[i + 1].scan_index = i;
> + state->core.channels[i + 1].modified = 1;
> + state->core.channels[i + 1].channel2 = IIO_MOD_X + i;
> + state->core.channels[i + 1].scan_type.sign = 's';
>
> /* Sensor specific */
> switch (state->core.type) {
> case MOTIONSENSE_TYPE_ACCEL:
> - channel->type = IIO_ACCEL;
> + state->core.channels[i + 1].type = IIO_ACCEL;
> break;
> case MOTIONSENSE_TYPE_GYRO:
> - channel->type = IIO_ANGL_VEL;
> + state->core.channels[i + 1].type = IIO_ANGL_VEL;
> break;
> case MOTIONSENSE_TYPE_MAG:
> - channel->type = IIO_MAGN;
> + state->core.channels[i + 1].type = IIO_MAGN;
> break;
> default:
> dev_err(&pdev->dev, "Unknown motion sensor\n");
> return -EINVAL;
> }
> }
> + state->core.channels[0].scan_index = CROS_EC_SENSOR_MAX_AXIS;
> +
> state->core.info.read_raw = &cros_ec_sensors_read;
> state->core.info.write_raw = &cros_ec_sensors_write;
>
> - /* Timestamp */
> - channel->type = IIO_TIMESTAMP;
> - channel->channel = -1;
> - channel->scan_index = CROS_EC_SENSOR_MAX_AXIS;
> - channel->scan_type.sign = 's';
> - channel->scan_type.realbits = 64;
> - channel->scan_type.storagebits = 64;
> -
> - indio_dev->channels = state->channels;
> - indio_dev->num_channels = CROS_EC_SENSORS_MAX_CHANNELS;
> -
> /* There is only enough room for accel and gyro in the io space */
> if ((state->core.ec->cmd_readmem != NULL) &&
> (state->core.type != MOTIONSENSE_TYPE_MAG))
> diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> index a1b324e1a5d8..e5181e007dd7 100644
> --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> @@ -26,15 +26,25 @@ static char *cros_ec_loc[] = {
> };
>
> int cros_ec_sensors_core_init(struct platform_device *pdev,
> - struct iio_dev *indio_dev,
> + int sizeof_priv,
> + int num_channels,
> bool physical_device)
> {
> struct device *dev = &pdev->dev;
> - struct cros_ec_sensors_core_state *state = iio_priv(indio_dev);
> + struct cros_ec_sensors_core_state *state;
> struct cros_ec_dev *ec = dev_get_drvdata(pdev->dev.parent);
> struct cros_ec_sensor_platform *sensor_platform = dev_get_platdata(dev);
> + struct iio_dev *indio_dev;
> +
> + if (num_channels > CROS_EC_SENSORS_CORE_MAX_CHANNELS)
> + return -EINVAL;
> +
> + indio_dev = devm_iio_device_alloc(dev, sizeof_priv);
> + if (!indio_dev)
> + return -ENOMEM;
>
> platform_set_drvdata(pdev, indio_dev);
> + state = iio_priv(indio_dev);
>
> state->ec = ec->ec_dev;
> state->msg = devm_kzalloc(&pdev->dev,
> @@ -70,6 +80,17 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
>
> indio_dev->info = &state->info;
>
> + /* Timestamp channel */
> + state->channels[0].type = IIO_TIMESTAMP;
> + state->channels[0].channel = -1;
> + state->channels[0].scan_index = 0;
> + state->channels[0].scan_type.sign = 's';
> + state->channels[0].scan_type.realbits = 64;
> + state->channels[0].scan_type.storagebits = 64;
> +
> + indio_dev->channels = state->channels;
> + indio_dev->num_channels = num_channels;
> +
> return 0;
> }
> EXPORT_SYMBOL_GPL(cros_ec_sensors_core_init);
> diff --git a/drivers/iio/light/cros_ec_light_prox.c b/drivers/iio/light/cros_ec_light_prox.c
> index b319d95fb70f..32ea5afd495f 100644
> --- a/drivers/iio/light/cros_ec_light_prox.c
> +++ b/drivers/iio/light/cros_ec_light_prox.c
> @@ -31,8 +31,6 @@
> struct cros_ec_light_prox_state {
> /* Shared by all sensors */
> struct cros_ec_sensors_core_state core;
> -
> - struct iio_chan_spec channels[CROS_EC_LIGHT_PROX_MAX_CHANNELS];
> };
>
> static int cros_ec_light_prox_read(struct iio_dev *indio_dev,
> @@ -167,7 +165,6 @@ static int cros_ec_light_prox_probe(struct platform_device *pdev)
> struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent);
> struct iio_dev *indio_dev;
> struct cros_ec_light_prox_state *state;
> - struct iio_chan_spec *channel;
> int ret;
>
> if (!ec_dev || !ec_dev->ec_dev) {
> @@ -175,46 +172,38 @@ static int cros_ec_light_prox_probe(struct platform_device *pdev)
> return -EINVAL;
> }
>
> - indio_dev = devm_iio_device_alloc(dev, sizeof(*state));
> - if (!indio_dev)
> - return -ENOMEM;
> -
> - ret = cros_ec_sensors_core_init(pdev, indio_dev, true);
> + ret = cros_ec_sensors_core_init(pdev, sizeof(*state),
> + CROS_EC_LIGHT_PROX_MAX_CHANNELS, true);
> if (ret)
> return ret;
>
> + indio_dev = platform_get_drvdata(pdev);
> state = iio_priv(indio_dev);
> state->core.type = state->core.resp->info.type;
> state->core.loc = state->core.resp->info.location;
> state->core.info.read_raw = &cros_ec_light_prox_read;
> state->core.info.write_raw = &cros_ec_light_prox_write;
> - channel = state->channels;
>
> /* Common part */
> - channel->info_mask_shared_by_all =
> + cros_ec_core_channel_init(state->core.channels, 1);
> + state->core.channels[1].info_mask_shared_by_all =
> BIT(IIO_CHAN_INFO_SAMP_FREQ) |
> BIT(IIO_CHAN_INFO_FREQUENCY);
> - channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
> - channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
> - channel->scan_type.shift = 0;
> - channel->scan_index = 0;
> - channel->ext_info = cros_ec_sensors_ext_info;
> - channel->scan_type.sign = 'u';
>
> state->core.calib[0] = 0;
>
> /* Sensor specific */
> switch (state->core.type) {
> case MOTIONSENSE_TYPE_LIGHT:
> - channel->type = IIO_LIGHT;
> - channel->info_mask_separate =
> + state->core.channels[1].type = IIO_LIGHT;
> + state->core.channels[1].info_mask_separate =
> BIT(IIO_CHAN_INFO_PROCESSED) |
> BIT(IIO_CHAN_INFO_CALIBBIAS) |
> BIT(IIO_CHAN_INFO_CALIBSCALE);
> break;
> case MOTIONSENSE_TYPE_PROX:
> - channel->type = IIO_PROXIMITY;
> - channel->info_mask_separate =
> + state->core.channels[1].type = IIO_PROXIMITY;
> + state->core.channels[1].info_mask_separate =
> BIT(IIO_CHAN_INFO_RAW) |
> BIT(IIO_CHAN_INFO_CALIBBIAS) |
> BIT(IIO_CHAN_INFO_CALIBSCALE);
> @@ -224,19 +213,6 @@ static int cros_ec_light_prox_probe(struct platform_device *pdev)
> return -EINVAL;
> }
>
> - /* Timestamp */
> - channel++;
> - channel->type = IIO_TIMESTAMP;
> - channel->channel = -1;
> - channel->scan_index = 1;
> - channel->scan_type.sign = 's';
> - channel->scan_type.realbits = 64;
> - channel->scan_type.storagebits = 64;
> -
> - indio_dev->channels = state->channels;
> -
> - indio_dev->num_channels = CROS_EC_LIGHT_PROX_MAX_CHANNELS;
> -
> state->core.read_ec_sensors_data = cros_ec_sensors_read_cmd;
>
> ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
> diff --git a/drivers/iio/pressure/cros_ec_baro.c b/drivers/iio/pressure/cros_ec_baro.c
> index 85a4864e3a4e..8718036d74d2 100644
> --- a/drivers/iio/pressure/cros_ec_baro.c
> +++ b/drivers/iio/pressure/cros_ec_baro.c
> @@ -29,8 +29,6 @@
> struct cros_ec_baro_state {
> /* Shared by all sensors */
> struct cros_ec_sensors_core_state core;
> -
> - struct iio_chan_spec channels[CROS_EC_BARO_MAX_CHANNELS];
> };
>
> static int cros_ec_baro_read(struct iio_dev *indio_dev,
> @@ -113,7 +111,6 @@ static int cros_ec_baro_probe(struct platform_device *pdev)
> struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent);
> struct iio_dev *indio_dev;
> struct cros_ec_baro_state *state;
> - struct iio_chan_spec *channel;
> int ret;
>
> if (!ec_dev || !ec_dev->ec_dev) {
> @@ -121,57 +118,38 @@ static int cros_ec_baro_probe(struct platform_device *pdev)
> return -EINVAL;
> }
>
> - indio_dev = devm_iio_device_alloc(dev, sizeof(*state));
> - if (!indio_dev)
> - return -ENOMEM;
> -
> - ret = cros_ec_sensors_core_init(pdev, indio_dev, true);
> + ret = cros_ec_sensors_core_init(pdev, sizeof(*state),
> + CROS_EC_BARO_MAX_CHANNELS, true);
> if (ret)
> return ret;
>
> + indio_dev = platform_get_drvdata(pdev);
> state = iio_priv(indio_dev);
> state->core.type = state->core.resp->info.type;
> state->core.loc = state->core.resp->info.location;
> state->core.info.read_raw = &cros_ec_baro_read;
> state->core.info.write_raw = &cros_ec_baro_write;
> - channel = state->channels;
> +
> /* Common part */
> - channel->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
> - channel->info_mask_shared_by_all =
> + cros_ec_core_channel_init(state->core.channels, 1);
> + state->core.channels[1].info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
> + state->core.channels[1].info_mask_shared_by_all =
> BIT(IIO_CHAN_INFO_SCALE) |
> BIT(IIO_CHAN_INFO_SAMP_FREQ) |
> BIT(IIO_CHAN_INFO_FREQUENCY);
> - channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
> - channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
> - channel->scan_type.shift = 0;
> - channel->scan_index = 0;
> - channel->ext_info = cros_ec_sensors_ext_info;
> - channel->scan_type.sign = 'u';
>
> state->core.calib[0] = 0;
>
> /* Sensor specific */
> switch (state->core.type) {
> case MOTIONSENSE_TYPE_BARO:
> - channel->type = IIO_PRESSURE;
> + state->core.channels[1].type = IIO_PRESSURE;
> break;
> default:
> dev_warn(dev, "Unknown motion sensor\n");
> return -EINVAL;
> }
>
> - /* Timestamp */
> - channel++;
> - channel->type = IIO_TIMESTAMP;
> - channel->channel = -1;
> - channel->scan_index = 1;
> - channel->scan_type.sign = 's';
> - channel->scan_type.realbits = 64;
> - channel->scan_type.storagebits = 64;
> -
> - indio_dev->channels = state->channels;
> - indio_dev->num_channels = CROS_EC_BARO_MAX_CHANNELS;
> -
> state->core.read_ec_sensors_data = cros_ec_sensors_read_cmd;
>
> ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
> diff --git a/include/linux/iio/common/cros_ec_sensors_core.h b/include/linux/iio/common/cros_ec_sensors_core.h
> index a729e667f760..485c649b421f 100644
> --- a/include/linux/iio/common/cros_ec_sensors_core.h
> +++ b/include/linux/iio/common/cros_ec_sensors_core.h
> @@ -31,6 +31,8 @@ enum {
> /* Minimum sampling period to use when device is suspending */
> #define CROS_EC_MIN_SUSPEND_SAMPLING_FREQUENCY 1000 /* 1 second */
>
> +#define CROS_EC_SENSORS_CORE_MAX_CHANNELS 8
> +
> /**
> * struct cros_ec_sensors_core_state - state data for EC sensors IIO driver
> * @ec: cros EC device structure
> @@ -71,6 +73,7 @@ struct cros_ec_sensors_core_state {
>
> int curr_sampl_freq;
> struct iio_info info;
> + struct iio_chan_spec channels[CROS_EC_SENSORS_CORE_MAX_CHANNELS];
> };
>
> /**
> @@ -102,13 +105,15 @@ struct platform_device;
> /**
> * cros_ec_sensors_core_init() - basic initialization of the core structure
> * @pdev: platform device created for the sensors
> - * @indio_dev: iio device structure of the device
> + * @sizeof_priv: size of the private structure
> + * @num_channels: Number of channel
> * @physical_device: true if the device refers to a physical device
> *
> * Return: 0 on success, -errno on failure.
> */
> int cros_ec_sensors_core_init(struct platform_device *pdev,
> - struct iio_dev *indio_dev, bool physical_device);
> + int sizeof_priv, int num_channels,
> + bool physical_device);
>
> /**
> * cros_ec_sensors_capture() - the trigger handler function
> @@ -124,6 +129,21 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
> */
> irqreturn_t cros_ec_sensors_capture(int irq, void *p);
>
> +/**
> + * cros_ec_core_channel_init() - initialize channel
> + * @channel: channels table
> + * @idx: channel index to initialize
> + *
> + * Return: 0 on success, -errno on failure.
> + */
> +#define cros_ec_core_channel_init(channel, idx) \
> + channel[idx].scan_type.realbits = CROS_EC_SENSOR_BITS;\
> + channel[idx].scan_type.storagebits = CROS_EC_SENSOR_BITS;\
> + channel[idx].scan_type.shift = 0;\

No need to define the 'obvious' 0 shift case.
These must already be initialized to zero or all sorts of things are
going to potentially break.

> + channel[idx].scan_index = idx;\
> + channel[idx].ext_info = cros_ec_sensors_ext_info;\
> + channel[idx].scan_type.sign = 'u';
> +
> /**
> * cros_ec_motion_send_host_cmd() - send motion sense host command
> * @st: pointer to state information for device

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