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[84.72.156.211]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-adf8b393ea8sm412692766b.159.2025.06.15.15.23.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 15 Jun 2025 15:23:09 -0700 (PDT) From: Lothar Rubusch To: jic23@kernel.org, dlechner@baylibre.com, nuno.sa@analog.com, andy@kernel.org, corbet@lwn.net, lucas.p.stankus@gmail.com, lars@metafoo.de, Michael.Hennerich@analog.com, bagasdotme@gmail.com Cc: l.rubusch@gmail.com, linux-iio@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 4/8] iio: accel: adxl313: add activity sensing Date: Sun, 15 Jun 2025 22:22:54 +0000 Message-Id: <20250615222258.117771-5-l.rubusch@gmail.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250615222258.117771-1-l.rubusch@gmail.com> References: <20250615222258.117771-1-l.rubusch@gmail.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add support for configuring an activity detection threshold. Extend the interrupt handler to process activity-related interrupts, and provide functions to set the threshold as well as to enable or disable activity sensing. Additionally, introduce a virtual channel that represents the logical AND of the x, y, and z axes in the IIO channel. This patch serves as a preparatory step; some definitions and functions introduced here are intended to be extended later to support inactivity detection. Signed-off-by: Lothar Rubusch --- drivers/iio/accel/adxl313_core.c | 244 +++++++++++++++++++++++++++++++ 1 file changed, 244 insertions(+) diff --git a/drivers/iio/accel/adxl313_core.c b/drivers/iio/accel/adxl313_core.c index 488680807a8f..b0d14ce60f01 100644 --- a/drivers/iio/accel/adxl313_core.c +++ b/drivers/iio/accel/adxl313_core.c @@ -13,8 +13,10 @@ #include #include #include +#include #include +#include #include #include "adxl313.h" @@ -25,6 +27,21 @@ #define ADXL313_REG_XYZ_BASE ADXL313_REG_DATA_AXIS(0) +#define ADXL313_ACT_XYZ_EN GENMASK(6, 4) + +/* activity/inactivity */ +enum adxl313_activity_type { + ADXL313_ACTIVITY, +}; + +static const unsigned int adxl313_act_int_reg[] = { + [ADXL313_ACTIVITY] = ADXL313_INT_ACTIVITY, +}; + +static const unsigned int adxl313_act_thresh_reg[] = { + [ADXL313_ACTIVITY] = ADXL313_REG_THRESH_ACT, +}; + static const struct regmap_range adxl312_readable_reg_range[] = { regmap_reg_range(ADXL313_REG_DEVID0, ADXL313_REG_DEVID0), regmap_reg_range(ADXL313_REG_OFS_AXIS(0), ADXL313_REG_OFS_AXIS(2)), @@ -227,6 +244,15 @@ static const int adxl313_odr_freqs[][2] = { }, \ } +static const struct iio_event_spec adxl313_activity_events[] = { + { + .type = IIO_EV_TYPE_MAG, + .dir = IIO_EV_DIR_RISING, + .mask_separate = BIT(IIO_EV_INFO_ENABLE), + .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE), + }, +}; + enum adxl313_chans { chan_x, chan_y, chan_z, }; @@ -235,6 +261,14 @@ static const struct iio_chan_spec adxl313_channels[] = { ADXL313_ACCEL_CHANNEL(0, chan_x, X), ADXL313_ACCEL_CHANNEL(1, chan_y, Y), ADXL313_ACCEL_CHANNEL(2, chan_z, Z), + { + .type = IIO_ACCEL, + .modified = 1, + .channel2 = IIO_MOD_X_OR_Y_OR_Z, + .scan_index = -1, /* Fake channel for axis OR'ing */ + .event_spec = adxl313_activity_events, + .num_event_specs = ARRAY_SIZE(adxl313_activity_events), + }, }; static const unsigned long adxl313_scan_masks[] = { @@ -297,6 +331,73 @@ static int adxl313_read_freq_avail(struct iio_dev *indio_dev, } } +static int adxl313_is_act_inact_en(struct adxl313_data *data, + enum adxl313_activity_type type) +{ + unsigned int axis_ctrl; + unsigned int regval; + int axis_en, ret; + + ret = regmap_read(data->regmap, ADXL313_REG_ACT_INACT_CTL, &axis_ctrl); + if (ret) + return ret; + + axis_en = FIELD_GET(ADXL313_ACT_XYZ_EN, axis_ctrl); + + if (!axis_en) + return false; + + /* Check if specific interrupt is enabled */ + ret = regmap_read(data->regmap, ADXL313_REG_INT_ENABLE, ®val); + if (ret) + return ret; + + return adxl313_act_int_reg[type] & regval; +} + +static int adxl313_set_act_inact_en(struct adxl313_data *data, + enum adxl313_activity_type type, + bool cmd_en) +{ + unsigned int axis_ctrl; + unsigned int threshold; + int ret; + + if (type != ADXL313_ACTIVITY) + return 0; + + if (cmd_en) { + /* When turning on, check if threshold is valid */ + ret = regmap_read(data->regmap, adxl313_act_thresh_reg[type], + &threshold); + if (ret) + return ret; + + if (!threshold) /* Just ignore the command if threshold is 0 */ + return 0; + } + + /* Start modifying configuration registers */ + ret = adxl313_set_measure_en(data, false); + if (ret) + return ret; + + /* Enable axis according to the command */ + axis_ctrl = ADXL313_ACT_XYZ_EN; + ret = regmap_assign_bits(data->regmap, ADXL313_REG_ACT_INACT_CTL, + axis_ctrl, cmd_en); + if (ret) + return ret; + + /* Enable the interrupt line, according to the command */ + ret = regmap_assign_bits(data->regmap, ADXL313_REG_INT_ENABLE, + adxl313_act_int_reg[type], cmd_en); + if (ret) + return ret; + + return adxl313_set_measure_en(data, true); +} + static int adxl313_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) @@ -370,6 +471,103 @@ static int adxl313_write_raw(struct iio_dev *indio_dev, } } +static int adxl313_read_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir) +{ + struct adxl313_data *data = iio_priv(indio_dev); + + if (type != IIO_EV_TYPE_MAG) + return -EINVAL; + + switch (dir) { + case IIO_EV_DIR_RISING: + return adxl313_is_act_inact_en(data, ADXL313_ACTIVITY); + default: + return -EINVAL; + } +} + +static int adxl313_write_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + bool state) +{ + struct adxl313_data *data = iio_priv(indio_dev); + + if (type != IIO_EV_TYPE_MAG) + return -EINVAL; + + switch (dir) { + case IIO_EV_DIR_RISING: + return adxl313_set_act_inact_en(data, ADXL313_ACTIVITY, state); + default: + return -EINVAL; + } +} + +static int adxl313_read_event_value(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + enum iio_event_info info, + int *val, int *val2) +{ + struct adxl313_data *data = iio_priv(indio_dev); + unsigned int act_threshold; + int ret; + + if (type != IIO_EV_TYPE_MAG) + return -EINVAL; + + if (info != IIO_EV_INFO_VALUE) + return -EINVAL; + + switch (dir) { + case IIO_EV_DIR_RISING: + ret = regmap_read(data->regmap, + adxl313_act_thresh_reg[ADXL313_ACTIVITY], + &act_threshold); + if (ret) + return ret; + *val = act_threshold * 15625; + *val2 = MICRO; + return IIO_VAL_FRACTIONAL; + default: + return -EINVAL; + } +} + +static int adxl313_write_event_value(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + enum iio_event_info info, + int val, int val2) +{ + struct adxl313_data *data = iio_priv(indio_dev); + unsigned int regval; + + if (type != IIO_EV_TYPE_MAG) + return -EINVAL; + + if (info != IIO_EV_INFO_VALUE) + return -EINVAL; + + /* Scale factor 15.625 mg/LSB */ + regval = DIV_ROUND_CLOSEST(val * MICRO + val2, 15625); + switch (dir) { + case IIO_EV_DIR_RISING: + return regmap_write(data->regmap, + adxl313_act_thresh_reg[ADXL313_ACTIVITY], + regval); + default: + return -EINVAL; + } +} + static int adxl313_set_watermark(struct iio_dev *indio_dev, unsigned int value) { struct adxl313_data *data = iio_priv(indio_dev); @@ -508,6 +706,25 @@ static int adxl313_fifo_push(struct iio_dev *indio_dev, int samples) return 0; } +static int adxl313_push_events(struct iio_dev *indio_dev, int int_stat) +{ + s64 ts = iio_get_time_ns(indio_dev); + int ret = -ENOENT; + + if (FIELD_GET(ADXL313_INT_ACTIVITY, int_stat)) { + ret = iio_push_event(indio_dev, + IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, + IIO_MOD_X_OR_Y_OR_Z, + IIO_EV_TYPE_MAG, + IIO_EV_DIR_RISING), + ts); + if (ret) + return ret; + } + + return ret; +} + static irqreturn_t adxl313_irq_handler(int irq, void *p) { struct iio_dev *indio_dev = p; @@ -517,6 +734,16 @@ static irqreturn_t adxl313_irq_handler(int irq, void *p) if (regmap_read(data->regmap, ADXL313_REG_INT_SOURCE, &int_stat)) return IRQ_NONE; + /* + * In cases of sensor events not handled (still not implemented) by + * this driver, the FIFO needs to be drained to become operational + * again. In general the sensor configuration only should issue events + * which were configured by this driver. Anyway a miss-configuration + * easily might end up in a hanging sensor FIFO. + */ + if (adxl313_push_events(indio_dev, int_stat)) + goto err; + if (FIELD_GET(ADXL313_INT_WATERMARK, int_stat)) { samples = adxl313_get_samples(data); if (samples < 0) @@ -550,6 +777,10 @@ static int adxl313_reg_access(struct iio_dev *indio_dev, unsigned int reg, static const struct iio_info adxl313_info = { .read_raw = adxl313_read_raw, .write_raw = adxl313_write_raw, + .read_event_config = adxl313_read_event_config, + .write_event_config = adxl313_write_event_config, + .read_event_value = adxl313_read_event_value, + .write_event_value = adxl313_write_event_value, .read_avail = adxl313_read_freq_avail, .hwfifo_set_watermark = adxl313_set_watermark, .debugfs_reg_access = &adxl313_reg_access, @@ -663,6 +894,19 @@ int adxl313_core_probe(struct device *dev, if (ret) return ret; + /* + * Reset or configure the registers with reasonable default + * values. As having 0 in most cases may result in undesirable + * behavior if the interrupts are enabled. + */ + ret = regmap_write(data->regmap, ADXL313_REG_ACT_INACT_CTL, 0x00); + if (ret) + return ret; + + ret = regmap_write(data->regmap, ADXL313_REG_THRESH_ACT, 0x52); + if (ret) + return ret; + ret = devm_iio_kfifo_buffer_setup(dev, indio_dev, &adxl313_buffer_ops); if (ret) -- 2.39.5