Octavian Purdila schrieb am 17.11.2014 18:56:
> This patch combines the any motion and new data interrupts function
> into a single, generic, interrupt enable function. On top of this, we
> can later refactor triggers to make it easier to add new triggers.
>
> Signed-off-by: Octavian Purdila <octavian.purdila@xxxxxxxxx>
> ---
> drivers/iio/accel/bmc150-accel.c | 271 +++++++++++++++++----------------------
> 1 file changed, 115 insertions(+), 156 deletions(-)
>
> diff --git a/drivers/iio/accel/bmc150-accel.c b/drivers/iio/accel/bmc150-accel.c
> index 5bfb09d..ee4afc4 100644
> --- a/drivers/iio/accel/bmc150-accel.c
> +++ b/drivers/iio/accel/bmc150-accel.c
> @@ -144,6 +144,13 @@ struct bmc150_accel_chip_info {
> const struct bmc150_scale_info scale_table[4];
> };
>
> +struct bmc150_accel_interrupt_info {
> + u8 map_reg;
> + u8 map_bitmask;
> + u8 en_reg;
> + u8 en_bitmask;
> +};
> +
> struct bmc150_accel_data {
> struct i2c_client *client;
> struct iio_trigger *dready_trig;
> @@ -374,137 +381,6 @@ static int bmc150_accel_chip_init(struct bmc150_accel_data *data)
> return 0;
> }
>
> -static int bmc150_accel_setup_any_motion_interrupt(
> - struct bmc150_accel_data *data,
> - bool status)
> -{
> - int ret;
> -
> - /* Enable/Disable INT1 mapping */
> - ret = i2c_smbus_read_byte_data(data->client,
> - BMC150_ACCEL_REG_INT_MAP_0);
> - if (ret < 0) {
> - dev_err(&data->client->dev, "Error reading reg_int_map_0\n");
> - return ret;
> - }
> - if (status)
> - ret |= BMC150_ACCEL_INT_MAP_0_BIT_SLOPE;
> - else
> - ret &= ~BMC150_ACCEL_INT_MAP_0_BIT_SLOPE;
> -
> - ret = i2c_smbus_write_byte_data(data->client,
> - BMC150_ACCEL_REG_INT_MAP_0,
> - ret);
> - if (ret < 0) {
> - dev_err(&data->client->dev, "Error writing reg_int_map_0\n");
> - return ret;
> - }
> -
> - if (status) {
> - /*
> - * New data interrupt is always non-latched,
> - * which will have higher priority, so no need
> - * to set latched mode, we will be flooded anyway with INTR
> - */
> - if (!data->dready_trigger_on) {
> - ret = i2c_smbus_write_byte_data(data->client,
> - BMC150_ACCEL_REG_INT_RST_LATCH,
> - BMC150_ACCEL_INT_MODE_LATCH_INT |
> - BMC150_ACCEL_INT_MODE_LATCH_RESET);
> - if (ret < 0) {
> - dev_err(&data->client->dev,
> - "Error writing reg_int_rst_latch\n");
> - return ret;
> - }
> - }
> -
> - ret = i2c_smbus_write_byte_data(data->client,
> - BMC150_ACCEL_REG_INT_EN_0,
> - BMC150_ACCEL_INT_EN_BIT_SLP_X |
> - BMC150_ACCEL_INT_EN_BIT_SLP_Y |
> - BMC150_ACCEL_INT_EN_BIT_SLP_Z);
> - } else
> - ret = i2c_smbus_write_byte_data(data->client,
> - BMC150_ACCEL_REG_INT_EN_0,
> - 0);
> -
> - if (ret < 0) {
> - dev_err(&data->client->dev, "Error writing reg_int_en_0\n");
> - return ret;
> - }
> -
> - return 0;
> -}
> -
> -static int bmc150_accel_setup_new_data_interrupt(struct bmc150_accel_data *data,
> - bool status)
> -{
> - int ret;
> -
> - /* Enable/Disable INT1 mapping */
> - ret = i2c_smbus_read_byte_data(data->client,
> - BMC150_ACCEL_REG_INT_MAP_1);
> - if (ret < 0) {
> - dev_err(&data->client->dev, "Error reading reg_int_map_1\n");
> - return ret;
> - }
> - if (status)
> - ret |= BMC150_ACCEL_INT_MAP_1_BIT_DATA;
> - else
> - ret &= ~BMC150_ACCEL_INT_MAP_1_BIT_DATA;
> -
> - ret = i2c_smbus_write_byte_data(data->client,
> - BMC150_ACCEL_REG_INT_MAP_1,
> - ret);
> - if (ret < 0) {
> - dev_err(&data->client->dev, "Error writing reg_int_map_1\n");
> - return ret;
> - }
> -
> - if (status) {
> - /*
> - * Set non latched mode interrupt and clear any latched
> - * interrupt
> - */
> - ret = i2c_smbus_write_byte_data(data->client,
> - BMC150_ACCEL_REG_INT_RST_LATCH,
> - BMC150_ACCEL_INT_MODE_NON_LATCH_INT |
> - BMC150_ACCEL_INT_MODE_LATCH_RESET);
> - if (ret < 0) {
> - dev_err(&data->client->dev,
> - "Error writing reg_int_rst_latch\n");
> - return ret;
> - }
> -
> - ret = i2c_smbus_write_byte_data(data->client,
> - BMC150_ACCEL_REG_INT_EN_1,
> - BMC150_ACCEL_INT_EN_BIT_DATA_EN);
> -
> - } else {
> - /* Restore default interrupt mode */
> - ret = i2c_smbus_write_byte_data(data->client,
> - BMC150_ACCEL_REG_INT_RST_LATCH,
> - BMC150_ACCEL_INT_MODE_LATCH_INT |
> - BMC150_ACCEL_INT_MODE_LATCH_RESET);
> - if (ret < 0) {
> - dev_err(&data->client->dev,
> - "Error writing reg_int_rst_latch\n");
> - return ret;
> - }
> -
> - ret = i2c_smbus_write_byte_data(data->client,
> - BMC150_ACCEL_REG_INT_EN_1,
> - 0);
> - }
> -
> - if (ret < 0) {
> - dev_err(&data->client->dev, "Error writing reg_int_en_1\n");
> - return ret;
> - }
> -
> - return 0;
> -}
> -
> static int bmc150_accel_get_bw(struct bmc150_accel_data *data, int *val,
> int *val2)
> {
> @@ -559,6 +435,99 @@ static int bmc150_accel_set_power_state(struct bmc150_accel_data *data, bool on)
> }
> #endif
>
> +static struct bmc150_accel_interrupt_info bmc150_accel_interrupts[] = {
> + { /* data ready interrupt */
> + .map_reg = BMC150_ACCEL_REG_INT_MAP_1,
> + .map_bitmask = BMC150_ACCEL_INT_MAP_1_BIT_DATA,
> + .en_reg = BMC150_ACCEL_REG_INT_EN_1,
> + .en_bitmask = BMC150_ACCEL_INT_EN_BIT_DATA_EN,
> + },
> + { /* motion interrupt */
> + .map_reg = BMC150_ACCEL_REG_INT_MAP_0,
> + .map_bitmask = BMC150_ACCEL_INT_MAP_0_BIT_SLOPE,
> + .en_reg = BMC150_ACCEL_REG_INT_EN_0,
> + .en_bitmask = BMC150_ACCEL_INT_EN_BIT_SLP_X |
> + BMC150_ACCEL_INT_EN_BIT_SLP_Y |
> + BMC150_ACCEL_INT_EN_BIT_SLP_Z
> + },
> +};
> +
> +static int bmc150_accel_set_interrupt(struct bmc150_accel_data *data,
> + struct bmc150_accel_interrupt_info *info,
> + bool state)
> +{
> + int ret;
> +
> + /*
> + * We will expect the enable and disable to do operation in
> + * in reverse order. This will happen here anyway as our
> + * resume operation uses sync mode runtime pm calls, the
> + * suspend operation will be delayed by autosuspend delay
> + * So the disable operation will still happen in reverse of
> + * enable operation. When runtime pm is disabled the mode
> + * is always on so sequence doesn't matter
> + */
> + ret = bmc150_accel_set_power_state(data, state);
> + if (ret < 0)
> + return ret;
> +
> +
> + /* map the interrupt to the appropriate pins */
> + if (info->map_reg) {
So, info->map_reg might be set, but info->en_reg will always be set?
> + ret = i2c_smbus_read_byte_data(data->client, info->map_reg);
> + if (ret < 0) {
> + dev_err(&data->client->dev, "Error reading reg_int_map\n");
> + return ret;
> + }
> + if (state)
> + ret |= info->map_bitmask;
> + else
> + ret &= ~info->map_bitmask;
> +
> + ret = i2c_smbus_write_byte_data(data->client, info->map_reg,
> + ret);
> + if (ret < 0) {
> + dev_err(&data->client->dev, "Error writing reg_int_map\n");
> + return ret;
> + }
> + }
> +
> + /* enable/disable the interrupt */
> + ret = i2c_smbus_read_byte_data(data->client, info->en_reg);
> + if (ret < 0) {
> + dev_err(&data->client->dev, "Error reading reg_int_en\n");
> + return ret;
> + }
> +
> + if (state)
> + ret |= info->en_bitmask;
> + else
> + ret &= ~info->en_bitmask;
> +
> + ret = i2c_smbus_write_byte_data(data->client, info->en_reg, ret);
> + if (ret < 0) {
> + dev_err(&data->client->dev, "Error writing reg_int_en\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int bmc150_accel_setup_any_motion_interrupt(
> + struct bmc150_accel_data *data,
> + bool status)
> +{
> + return bmc150_accel_set_interrupt(data, &bmc150_accel_interrupts[1],
> + status);
> +}
> +
> +static int bmc150_accel_setup_new_data_interrupt(struct bmc150_accel_data *data,
> + bool status)
> +{
> + return bmc150_accel_set_interrupt(data, &bmc150_accel_interrupts[0],
> + status);
> +}
> +
I don't think these wrappers really provide a benefit.
> static int bmc150_accel_set_scale(struct bmc150_accel_data *data, int val)
> {
> int ret, i;
> @@ -808,22 +777,6 @@ static int bmc150_accel_write_event_config(struct iio_dev *indio_dev,
> return 0;
> }
>
> - /*
> - * We will expect the enable and disable to do operation in
> - * in reverse order. This will happen here anyway as our
> - * resume operation uses sync mode runtime pm calls, the
> - * suspend operation will be delayed by autosuspend delay
> - * So the disable operation will still happen in reverse of
> - * enable operation. When runtime pm is disabled the mode
> - * is always on so sequence doesn't matter
> - */
> -
> - ret = bmc150_accel_set_power_state(data, state);
> - if (ret < 0) {
> - mutex_unlock(&data->mutex);
> - return ret;
> - }
> -
> ret = bmc150_accel_setup_any_motion_interrupt(data, state);
> if (ret < 0) {
> mutex_unlock(&data->mutex);
> @@ -1055,15 +1008,6 @@ static int bmc150_accel_data_rdy_trigger_set_state(struct iio_trigger *trig,
> return 0;
> }
>
> - /*
> - * Refer to comment in bmc150_accel_write_event_config for
> - * enable/disable operation order
> - */
> - ret = bmc150_accel_set_power_state(data, state);
> - if (ret < 0) {
> - mutex_unlock(&data->mutex);
> - return ret;
> - }
> if (data->motion_trig == trig)
> ret = bmc150_accel_setup_any_motion_interrupt(data, state);
> else
> @@ -1240,6 +1184,21 @@ static int bmc150_accel_probe(struct i2c_client *client,
> if (ret)
> return ret;
>
> + /*
> + * Set latched mode interrupt. While certain interrupts are
> + * non-latched regardless of this settings (e.g. new data) we
> + * want to use latch mode when we can to prevent interrupt
> + * flooding.
> + */
> + ret = i2c_smbus_write_byte_data(data->client,
> + BMC150_ACCEL_REG_INT_RST_LATCH,
> + BMC150_ACCEL_INT_MODE_LATCH_RESET);
> + if (ret < 0) {
> + dev_err(&data->client->dev, "Error writing reg_int_rst_latch\n");
> + return ret;
> + }
> +
> +
> data->dready_trig = devm_iio_trigger_alloc(&client->dev,
> "%s-dev%d",
> indio_dev->name,
>
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