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SubjectRe: [PATCH v6 3/4] iio: cros_ec_accel_legacy: Use cros_ec_sensors_core
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On 16/7/19 1:14, Gwendal Grignou wrote:
> Remove duplicate code in cros-ec-accel-legacy,
> use cros-ec-sensors-core functions and structures when possible.
>
> On glimmer, check the 2 accelerometers are presented and working.
>
> Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
> Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

As the mutex problem is fixed:

Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>

> ---
> drivers/iio/accel/Kconfig | 4 +-
> drivers/iio/accel/cros_ec_accel_legacy.c | 336 ++++-------------------
> 2 files changed, 55 insertions(+), 285 deletions(-)
>
> diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
> index 62a970a20219..7d0848f9ea45 100644
> --- a/drivers/iio/accel/Kconfig
> +++ b/drivers/iio/accel/Kconfig
> @@ -201,9 +201,7 @@ config HID_SENSOR_ACCEL_3D
>
> config IIO_CROS_EC_ACCEL_LEGACY
> tristate "ChromeOS EC Legacy Accelerometer Sensor"
> - select IIO_BUFFER
> - select IIO_TRIGGERED_BUFFER
> - select CROS_EC_LPC_REGISTER_DEVICE
> + depends on IIO_CROS_EC_SENSORS_CORE
> help
> Say yes here to get support for accelerometers on Chromebook using
> legacy EC firmware.
> diff --git a/drivers/iio/accel/cros_ec_accel_legacy.c b/drivers/iio/accel/cros_ec_accel_legacy.c
> index ad19d9c716f4..f65578c65a1c 100644
> --- a/drivers/iio/accel/cros_ec_accel_legacy.c
> +++ b/drivers/iio/accel/cros_ec_accel_legacy.c
> @@ -12,6 +12,7 @@
> #include <linux/delay.h>
> #include <linux/device.h>
> #include <linux/iio/buffer.h>
> +#include <linux/iio/common/cros_ec_sensors_core.h>
> #include <linux/iio/iio.h>
> #include <linux/iio/kfifo_buf.h>
> #include <linux/iio/trigger_consumer.h>
> @@ -25,191 +26,51 @@
>
> #define DRV_NAME "cros-ec-accel-legacy"
>
> +#define CROS_EC_SENSOR_LEGACY_NUM 2
> /*
> * Sensor scale hard coded at 10 bits per g, computed as:
> * g / (2^10 - 1) = 0.009586168; with g = 9.80665 m.s^-2
> */
> #define ACCEL_LEGACY_NSCALE 9586168
>
> -/* Indices for EC sensor values. */
> -enum {
> - X,
> - Y,
> - Z,
> - MAX_AXIS,
> -};
> -
> -/* State data for cros_ec_accel_legacy iio driver. */
> -struct cros_ec_accel_legacy_state {
> - struct cros_ec_device *ec;
> -
> - /*
> - * Array holding data from a single capture. 2 bytes per channel
> - * for the 3 channels plus the timestamp which is always last and
> - * 8-bytes aligned.
> - */
> - s16 capture_data[8];
> - s8 sign[MAX_AXIS];
> - u8 sensor_num;
> -};
> -
> -static int ec_cmd_read_u8(struct cros_ec_device *ec, unsigned int offset,
> - u8 *dest)
> -{
> - return ec->cmd_readmem(ec, offset, 1, dest);
> -}
> -
> -static int ec_cmd_read_u16(struct cros_ec_device *ec, unsigned int offset,
> - u16 *dest)
> -{
> - __le16 tmp;
> - int ret = ec->cmd_readmem(ec, offset, 2, &tmp);
> -
> - *dest = le16_to_cpu(tmp);
> -
> - return ret;
> -}
> -
> -/**
> - * read_ec_until_not_busy() - Read from EC status byte until it reads not busy.
> - * @st: Pointer to state information for device.
> - *
> - * This function reads EC status until its busy bit gets cleared. It does not
> - * wait indefinitely and returns -EIO if the EC status is still busy after a
> - * few hundreds milliseconds.
> - *
> - * Return: 8-bit status if ok, -EIO on error
> - */
> -static int read_ec_until_not_busy(struct cros_ec_accel_legacy_state *st)
> -{
> - struct cros_ec_device *ec = st->ec;
> - u8 status;
> - int attempts = 0;
> -
> - ec_cmd_read_u8(ec, EC_MEMMAP_ACC_STATUS, &status);
> - while (status & EC_MEMMAP_ACC_STATUS_BUSY_BIT) {
> - /* Give up after enough attempts, return error. */
> - if (attempts++ >= 50)
> - return -EIO;
> -
> - /* Small delay every so often. */
> - if (attempts % 5 == 0)
> - msleep(25);
> -
> - ec_cmd_read_u8(ec, EC_MEMMAP_ACC_STATUS, &status);
> - }
> -
> - return status;
> -}
> -
> -/**
> - * read_ec_accel_data_unsafe() - Read acceleration data from EC shared memory.
> - * @st: Pointer to state information for device.
> - * @scan_mask: Bitmap of the sensor indices to scan.
> - * @data: Location to store data.
> - *
> - * This is the unsafe function for reading the EC data. It does not guarantee
> - * that the EC will not modify the data as it is being read in.
> - */
> -static void read_ec_accel_data_unsafe(struct cros_ec_accel_legacy_state *st,
> - unsigned long scan_mask, s16 *data)
> -{
> - int i = 0;
> - int num_enabled = bitmap_weight(&scan_mask, MAX_AXIS);
> -
> - /* Read all sensors enabled in scan_mask. Each value is 2 bytes. */
> - while (num_enabled--) {
> - i = find_next_bit(&scan_mask, MAX_AXIS, i);
> - ec_cmd_read_u16(st->ec,
> - EC_MEMMAP_ACC_DATA +
> - sizeof(s16) *
> - (1 + i + st->sensor_num * MAX_AXIS),
> - data);
> - *data *= st->sign[i];
> - i++;
> - data++;
> - }
> -}
> -
> -/**
> - * read_ec_accel_data() - Read acceleration data from EC shared memory.
> - * @st: Pointer to state information for device.
> - * @scan_mask: Bitmap of the sensor indices to scan.
> - * @data: Location to store data.
> - *
> - * This is the safe function for reading the EC data. It guarantees that
> - * the data sampled was not modified by the EC while being read.
> - *
> - * Return: 0 if ok, -ve on error
> - */
> -static int read_ec_accel_data(struct cros_ec_accel_legacy_state *st,
> - unsigned long scan_mask, s16 *data)
> -{
> - u8 samp_id = 0xff;
> - u8 status = 0;
> - int ret;
> - int attempts = 0;
> -
> - /*
> - * Continually read all data from EC until the status byte after
> - * all reads reflects that the EC is not busy and the sample id
> - * matches the sample id from before all reads. This guarantees
> - * that data read in was not modified by the EC while reading.
> - */
> - while ((status & (EC_MEMMAP_ACC_STATUS_BUSY_BIT |
> - EC_MEMMAP_ACC_STATUS_SAMPLE_ID_MASK)) != samp_id) {
> - /* If we have tried to read too many times, return error. */
> - if (attempts++ >= 5)
> - return -EIO;
> -
> - /* Read status byte until EC is not busy. */
> - ret = read_ec_until_not_busy(st);
> - if (ret < 0)
> - return ret;
> - status = ret;
> -
> - /*
> - * Store the current sample id so that we can compare to the
> - * sample id after reading the data.
> - */
> - samp_id = status & EC_MEMMAP_ACC_STATUS_SAMPLE_ID_MASK;
> -
> - /* Read all EC data, format it, and store it into data. */
> - read_ec_accel_data_unsafe(st, scan_mask, data);
> -
> - /* Read status byte. */
> - ec_cmd_read_u8(st->ec, EC_MEMMAP_ACC_STATUS, &status);
> - }
> -
> - return 0;
> -}
> -
> static int cros_ec_accel_legacy_read(struct iio_dev *indio_dev,
> struct iio_chan_spec const *chan,
> int *val, int *val2, long mask)
> {
> - struct cros_ec_accel_legacy_state *st = iio_priv(indio_dev);
> + struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
> s16 data = 0;
> - int ret = IIO_VAL_INT;
> + int ret;
> + int idx = chan->scan_index;
> +
> + mutex_lock(&st->cmd_lock);
>
> switch (mask) {
> case IIO_CHAN_INFO_RAW:
> - ret = read_ec_accel_data(st, (1 << chan->scan_index), &data);
> - if (ret)
> - return ret;
> + ret = st->read_ec_sensors_data(indio_dev, 1 << idx, &data);
> + if (ret < 0)
> + break;
> + ret = IIO_VAL_INT;
> *val = data;
> - return IIO_VAL_INT;
> + break;
> case IIO_CHAN_INFO_SCALE:
> + WARN_ON(st->type != MOTIONSENSE_TYPE_ACCEL);
> *val = 0;
> *val2 = ACCEL_LEGACY_NSCALE;
> - return IIO_VAL_INT_PLUS_NANO;
> + ret = IIO_VAL_INT_PLUS_NANO;
> + break;
> case IIO_CHAN_INFO_CALIBBIAS:
> /* Calibration not supported. */
> *val = 0;
> - return IIO_VAL_INT;
> + ret = IIO_VAL_INT;
> + break;
> default:
> - return -EINVAL;
> + ret = cros_ec_sensors_core_read(st, chan, val, val2,
> + mask);
> + break;
> }
> + mutex_unlock(&st->cmd_lock);
> +
> + return ret;
> }
>
> static int cros_ec_accel_legacy_write(struct iio_dev *indio_dev,
> @@ -231,86 +92,14 @@ static const struct iio_info cros_ec_accel_legacy_info = {
> .write_raw = &cros_ec_accel_legacy_write,
> };
>
> -/**
> - * cros_ec_accel_legacy_capture() - The trigger handler function
> - * @irq: The interrupt number.
> - * @p: Private data - always a pointer to the poll func.
> - *
> - * On a trigger event occurring, if the pollfunc is attached then this
> - * handler is called as a threaded interrupt (and hence may sleep). It
> - * is responsible for grabbing data from the device and pushing it into
> - * the associated buffer.
> - *
> - * Return: IRQ_HANDLED
> +/*
> + * Present the channel using HTML5 standard:
> + * need to invert X and Y and invert some lid axis.
> */
> -static irqreturn_t cros_ec_accel_legacy_capture(int irq, void *p)
> -{
> - struct iio_poll_func *pf = p;
> - struct iio_dev *indio_dev = pf->indio_dev;
> - struct cros_ec_accel_legacy_state *st = iio_priv(indio_dev);
> -
> - /* Clear capture data. */
> - memset(st->capture_data, 0, sizeof(st->capture_data));
> -
> - /*
> - * Read data based on which channels are enabled in scan mask. Note
> - * that on a capture we are always reading the calibrated data.
> - */
> - read_ec_accel_data(st, *indio_dev->active_scan_mask, st->capture_data);
> -
> - iio_push_to_buffers_with_timestamp(indio_dev, (void *)st->capture_data,
> - iio_get_time_ns(indio_dev));
> -
> - /*
> - * Tell the core we are done with this trigger and ready for the
> - * next one.
> - */
> - iio_trigger_notify_done(indio_dev->trig);
> -
> - return IRQ_HANDLED;
> -}
> -
> -static char *cros_ec_accel_legacy_loc_strings[] = {
> - [MOTIONSENSE_LOC_BASE] = "base",
> - [MOTIONSENSE_LOC_LID] = "lid",
> - [MOTIONSENSE_LOC_MAX] = "unknown",
> -};
> -
> -static ssize_t cros_ec_accel_legacy_loc(struct iio_dev *indio_dev,
> - uintptr_t private,
> - const struct iio_chan_spec *chan,
> - char *buf)
> -{
> - struct cros_ec_accel_legacy_state *st = iio_priv(indio_dev);
> -
> - return sprintf(buf, "%s\n",
> - cros_ec_accel_legacy_loc_strings[st->sensor_num +
> - MOTIONSENSE_LOC_BASE]);
> -}
> -
> -static ssize_t cros_ec_accel_legacy_id(struct iio_dev *indio_dev,
> - uintptr_t private,
> - const struct iio_chan_spec *chan,
> - char *buf)
> -{
> - struct cros_ec_accel_legacy_state *st = iio_priv(indio_dev);
> -
> - return sprintf(buf, "%d\n", st->sensor_num);
> -}
> -
> -static const struct iio_chan_spec_ext_info cros_ec_accel_legacy_ext_info[] = {
> - {
> - .name = "id",
> - .shared = IIO_SHARED_BY_ALL,
> - .read = cros_ec_accel_legacy_id,
> - },
> - {
> - .name = "location",
> - .shared = IIO_SHARED_BY_ALL,
> - .read = cros_ec_accel_legacy_loc,
> - },
> - { }
> -};
> +#define CROS_EC_ACCEL_ROTATE_AXIS(_axis) \
> + ((_axis) == CROS_EC_SENSOR_Z ? CROS_EC_SENSOR_Z : \
> + ((_axis) == CROS_EC_SENSOR_X ? CROS_EC_SENSOR_Y : \
> + CROS_EC_SENSOR_X))
>
> #define CROS_EC_ACCEL_LEGACY_CHAN(_axis) \
> { \
> @@ -321,28 +110,28 @@ static const struct iio_chan_spec_ext_info cros_ec_accel_legacy_ext_info[] = {
> BIT(IIO_CHAN_INFO_RAW) | \
> BIT(IIO_CHAN_INFO_CALIBBIAS), \
> .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SCALE), \
> - .ext_info = cros_ec_accel_legacy_ext_info, \
> + .ext_info = cros_ec_sensors_ext_info, \
> .scan_type = { \
> .sign = 's', \
> - .realbits = 16, \
> - .storagebits = 16, \
> + .realbits = CROS_EC_SENSOR_BITS, \
> + .storagebits = CROS_EC_SENSOR_BITS, \
> }, \
> + .scan_index = CROS_EC_ACCEL_ROTATE_AXIS(_axis), \
> } \
>
> -static struct iio_chan_spec ec_accel_channels[] = {
> - CROS_EC_ACCEL_LEGACY_CHAN(X),
> - CROS_EC_ACCEL_LEGACY_CHAN(Y),
> - CROS_EC_ACCEL_LEGACY_CHAN(Z),
> - IIO_CHAN_SOFT_TIMESTAMP(MAX_AXIS)
> +static const struct iio_chan_spec cros_ec_accel_legacy_channels[] = {
> + CROS_EC_ACCEL_LEGACY_CHAN(CROS_EC_SENSOR_X),
> + CROS_EC_ACCEL_LEGACY_CHAN(CROS_EC_SENSOR_Y),
> + CROS_EC_ACCEL_LEGACY_CHAN(CROS_EC_SENSOR_Z),
> + IIO_CHAN_SOFT_TIMESTAMP(CROS_EC_SENSOR_MAX_AXIS)
> };
>
> static int cros_ec_accel_legacy_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> struct cros_ec_dev *ec = dev_get_drvdata(dev->parent);
> - struct cros_ec_sensor_platform *sensor_platform = dev_get_platdata(dev);
> struct iio_dev *indio_dev;
> - struct cros_ec_accel_legacy_state *state;
> + struct cros_ec_sensors_core_state *state;
> int ret;
>
> if (!ec || !ec->ec_dev) {
> @@ -350,46 +139,29 @@ static int cros_ec_accel_legacy_probe(struct platform_device *pdev)
> return -EINVAL;
> }
>
> - if (!ec->ec_dev->cmd_readmem) {
> - dev_warn(&pdev->dev, "EC does not support direct reads.\n");
> - return -EINVAL;
> - }
> -
> indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*state));
> if (!indio_dev)
> return -ENOMEM;
>
> - platform_set_drvdata(pdev, indio_dev);
> - state = iio_priv(indio_dev);
> - state->ec = ec->ec_dev;
> - state->sensor_num = sensor_platform->sensor_num;
> -
> - indio_dev->dev.parent = dev;
> - indio_dev->name = pdev->name;
> - indio_dev->channels = ec_accel_channels;
> - /*
> - * Present the channel using HTML5 standard:
> - * need to invert X and Y and invert some lid axis.
> - */
> - ec_accel_channels[X].scan_index = Y;
> - ec_accel_channels[Y].scan_index = X;
> - ec_accel_channels[Z].scan_index = Z;
> + ret = cros_ec_sensors_core_init(pdev, indio_dev, true);
> + if (ret)
> + return ret;
>
> - state->sign[Y] = 1;
> + indio_dev->info = &cros_ec_accel_legacy_info;
> + state = iio_priv(indio_dev);
>
> - if (state->sensor_num == MOTIONSENSE_LOC_LID)
> - state->sign[X] = state->sign[Z] = -1;
> - else
> - state->sign[X] = state->sign[Z] = 1;
> + state->read_ec_sensors_data = cros_ec_sensors_read_lpc;
>
> - indio_dev->num_channels = ARRAY_SIZE(ec_accel_channels);
> - indio_dev->dev.parent = &pdev->dev;
> - indio_dev->info = &cros_ec_accel_legacy_info;
> - indio_dev->modes = INDIO_DIRECT_MODE;
> + indio_dev->channels = cros_ec_accel_legacy_channels;
> + indio_dev->num_channels = ARRAY_SIZE(cros_ec_accel_legacy_channels);
> + /* The lid sensor needs to be presented inverted. */
> + if (state->loc == MOTIONSENSE_LOC_LID) {
> + state->sign[CROS_EC_SENSOR_X] = -1;
> + state->sign[CROS_EC_SENSOR_Z] = -1;
> + }
>
> ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
> - cros_ec_accel_legacy_capture,
> - NULL);
> + cros_ec_sensors_capture, NULL);
> if (ret)
> return ret;
>
>

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