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-rw-r--r--drivers/iio/pressure/rohm-bm1390.c934
1 files changed, 934 insertions, 0 deletions
diff --git a/drivers/iio/pressure/rohm-bm1390.c b/drivers/iio/pressure/rohm-bm1390.c
new file mode 100644
index 0000000000..ccaa07a569
--- /dev/null
+++ b/drivers/iio/pressure/rohm-bm1390.c
@@ -0,0 +1,934 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * BM1390 ROHM pressure sensor
+ *
+ * Copyright (c) 2023, ROHM Semiconductor.
+ * https://fscdn.rohm.com/en/products/databook/datasheet/ic/sensor/pressure/bm1390glv-z-e.pdf
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+
+#define BM1390_REG_MANUFACT_ID 0x0f
+#define BM1390_REG_PART_ID 0x10
+#define BM1390_REG_POWER 0x12
+#define BM1390_MASK_POWER BIT(0)
+#define BM1390_POWER_ON BM1390_MASK_POWER
+#define BM1390_POWER_OFF 0x00
+#define BM1390_REG_RESET 0x13
+#define BM1390_MASK_RESET BIT(0)
+#define BM1390_RESET_RELEASE BM1390_MASK_RESET
+#define BM1390_RESET 0x00
+#define BM1390_REG_MODE_CTRL 0x14
+#define BM1390_MASK_MEAS_MODE GENMASK(1, 0)
+#define BM1390_MASK_DRDY_EN BIT(4)
+#define BM1390_MASK_WMI_EN BIT(2)
+#define BM1390_MASK_AVE_NUM GENMASK(7, 5)
+
+/*
+ * Data-sheet states that when the IIR is used, the AVE_NUM must be set to
+ * value 110b
+ */
+#define BM1390_IIR_AVE_NUM 0x06
+#define BM1390_REG_FIFO_CTRL 0x15
+#define BM1390_MASK_IIR_MODE GENMASK(1, 0)
+#define BM1390_IIR_MODE_OFF 0x0
+#define BM1390_IIR_MODE_WEAK 0x1
+#define BM1390_IIR_MODE_MID 0x2
+#define BM1390_IIR_MODE_STRONG 0x3
+
+#define BM1390_MASK_FIFO_LEN BIT(6)
+#define BM1390_MASK_FIFO_EN BIT(7)
+#define BM1390_WMI_MIN 2
+#define BM1390_WMI_MAX 3
+
+#define BM1390_REG_FIFO_LVL 0x18
+#define BM1390_MASK_FIFO_LVL GENMASK(2, 0)
+#define BM1390_REG_STATUS 0x19
+#define BM1390_REG_PRESSURE_BASE 0x1a
+#define BM1390_REG_TEMP_HI 0x1d
+#define BM1390_REG_TEMP_LO 0x1e
+#define BM1390_MAX_REGISTER BM1390_REG_TEMP_LO
+
+#define BM1390_ID 0x34
+
+/* Regmap configs */
+static const struct regmap_range bm1390_volatile_ranges[] = {
+ {
+ .range_min = BM1390_REG_STATUS,
+ .range_max = BM1390_REG_STATUS,
+ },
+ {
+ .range_min = BM1390_REG_FIFO_LVL,
+ .range_max = BM1390_REG_TEMP_LO,
+ },
+};
+
+static const struct regmap_access_table bm1390_volatile_regs = {
+ .yes_ranges = &bm1390_volatile_ranges[0],
+ .n_yes_ranges = ARRAY_SIZE(bm1390_volatile_ranges),
+};
+
+static const struct regmap_range bm1390_precious_ranges[] = {
+ {
+ .range_min = BM1390_REG_STATUS,
+ .range_max = BM1390_REG_STATUS,
+ },
+};
+
+static const struct regmap_access_table bm1390_precious_regs = {
+ .yes_ranges = &bm1390_precious_ranges[0],
+ .n_yes_ranges = ARRAY_SIZE(bm1390_precious_ranges),
+};
+
+static const struct regmap_range bm1390_read_only_ranges[] = {
+ {
+ .range_min = BM1390_REG_MANUFACT_ID,
+ .range_max = BM1390_REG_PART_ID,
+ }, {
+ .range_min = BM1390_REG_FIFO_LVL,
+ .range_max = BM1390_REG_TEMP_LO,
+ },
+};
+
+static const struct regmap_access_table bm1390_ro_regs = {
+ .no_ranges = &bm1390_read_only_ranges[0],
+ .n_no_ranges = ARRAY_SIZE(bm1390_read_only_ranges),
+};
+
+static const struct regmap_range bm1390_noinc_read_ranges[] = {
+ {
+ .range_min = BM1390_REG_PRESSURE_BASE,
+ .range_max = BM1390_REG_TEMP_LO,
+ },
+};
+
+static const struct regmap_access_table bm1390_nir_regs = {
+ .yes_ranges = &bm1390_noinc_read_ranges[0],
+ .n_yes_ranges = ARRAY_SIZE(bm1390_noinc_read_ranges),
+};
+
+static const struct regmap_config bm1390_regmap = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .volatile_table = &bm1390_volatile_regs,
+ .wr_table = &bm1390_ro_regs,
+ .rd_noinc_table = &bm1390_nir_regs,
+ .precious_table = &bm1390_precious_regs,
+ .max_register = BM1390_MAX_REGISTER,
+ .cache_type = REGCACHE_RBTREE,
+ .disable_locking = true,
+};
+
+enum {
+ BM1390_STATE_SAMPLE,
+ BM1390_STATE_FIFO,
+};
+
+struct bm1390_data_buf {
+ u32 pressure;
+ __be16 temp;
+ s64 ts __aligned(8);
+};
+
+/* BM1390 has FIFO for 4 pressure samples */
+#define BM1390_FIFO_LENGTH 4
+
+struct bm1390_data {
+ s64 timestamp, old_timestamp;
+ struct iio_trigger *trig;
+ struct regmap *regmap;
+ struct device *dev;
+ struct bm1390_data_buf buf;
+ int irq;
+ unsigned int state;
+ bool trigger_enabled;
+ u8 watermark;
+
+ /* Prevent accessing sensor during FIFO read sequence */
+ struct mutex mutex;
+};
+
+enum {
+ BM1390_CHAN_PRESSURE,
+ BM1390_CHAN_TEMP,
+};
+
+static const struct iio_chan_spec bm1390_channels[] = {
+ {
+ .type = IIO_PRESSURE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ /*
+ * When IIR is used, we must fix amount of averaged samples.
+ * Thus we don't allow setting oversampling ratio.
+ */
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
+ .scan_index = BM1390_CHAN_PRESSURE,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 22,
+ .storagebits = 32,
+ .endianness = IIO_LE,
+ },
+ },
+ {
+ .type = IIO_TEMP,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
+ .scan_index = BM1390_CHAN_TEMP,
+ .scan_type = {
+ .sign = 's',
+ .realbits = 16,
+ .storagebits = 16,
+ .endianness = IIO_BE,
+ },
+ },
+ IIO_CHAN_SOFT_TIMESTAMP(2),
+};
+
+/*
+ * We can't skip reading the pressure because the watermark IRQ is acked
+ * only when the pressure data is read from the FIFO.
+ */
+static const unsigned long bm1390_scan_masks[] = {
+ BIT(BM1390_CHAN_PRESSURE),
+ BIT(BM1390_CHAN_PRESSURE) | BIT(BM1390_CHAN_TEMP),
+ 0
+};
+
+static int bm1390_read_temp(struct bm1390_data *data, int *temp)
+{
+ __be16 temp_raw;
+ int ret;
+
+ ret = regmap_bulk_read(data->regmap, BM1390_REG_TEMP_HI, &temp_raw,
+ sizeof(temp_raw));
+ if (ret)
+ return ret;
+
+ *temp = be16_to_cpu(temp_raw);
+
+ return 0;
+}
+
+static int bm1390_pressure_read(struct bm1390_data *data, u32 *pressure)
+{
+ /* Pressure data is in 3 8-bit registers */
+ u8 raw[3];
+ int ret;
+
+ ret = regmap_bulk_read(data->regmap, BM1390_REG_PRESSURE_BASE,
+ raw, sizeof(raw));
+ if (ret < 0)
+ return ret;
+
+ *pressure = (u32)(raw[2] >> 2 | raw[1] << 6 | raw[0] << 14);
+
+ return 0;
+}
+
+ /* The enum values map directly to register bits */
+enum bm1390_meas_mode {
+ BM1390_MEAS_MODE_STOP = 0x0,
+ BM1390_MEAS_MODE_1SHOT = 0x1,
+ BM1390_MEAS_MODE_CONTINUOUS = 0x2,
+};
+
+static int bm1390_meas_set(struct bm1390_data *data, enum bm1390_meas_mode mode)
+{
+ return regmap_update_bits(data->regmap, BM1390_REG_MODE_CTRL,
+ BM1390_MASK_MEAS_MODE, mode);
+}
+
+/*
+ * If the trigger is not used we just wait until the measurement has
+ * completed. The data-sheet says maximum measurement cycle (regardless
+ * the AVE_NUM) is 200 mS so let's just sleep at least that long. If speed
+ * is needed the trigger should be used.
+ */
+#define BM1390_MAX_MEAS_TIME_MS 205
+
+static int bm1390_read_data(struct bm1390_data *data,
+ struct iio_chan_spec const *chan, int *val, int *val2)
+{
+ int ret, warn;
+
+ mutex_lock(&data->mutex);
+ /*
+ * We use 'continuous mode' even for raw read because according to the
+ * data-sheet an one-shot mode can't be used with IIR filter.
+ */
+ ret = bm1390_meas_set(data, BM1390_MEAS_MODE_CONTINUOUS);
+ if (ret)
+ goto unlock_out;
+
+ switch (chan->type) {
+ case IIO_PRESSURE:
+ msleep(BM1390_MAX_MEAS_TIME_MS);
+ ret = bm1390_pressure_read(data, val);
+ break;
+ case IIO_TEMP:
+ msleep(BM1390_MAX_MEAS_TIME_MS);
+ ret = bm1390_read_temp(data, val);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ warn = bm1390_meas_set(data, BM1390_MEAS_MODE_STOP);
+ if (warn)
+ dev_warn(data->dev, "Failed to stop measurement (%d)\n", warn);
+unlock_out:
+ mutex_unlock(&data->mutex);
+
+ return ret;
+}
+
+static int bm1390_read_raw(struct iio_dev *idev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct bm1390_data *data = iio_priv(idev);
+ int ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SCALE:
+ if (chan->type == IIO_TEMP) {
+ *val = 31;
+ *val2 = 250000;
+
+ return IIO_VAL_INT_PLUS_MICRO;
+ } else if (chan->type == IIO_PRESSURE) {
+ /*
+ * pressure in hPa is register value divided by 2048.
+ * This means kPa is 1/20480 times the register value,
+ */
+ *val = 1;
+ *val2 = 2048;
+
+ return IIO_VAL_FRACTIONAL;
+ }
+
+ return -EINVAL;
+ case IIO_CHAN_INFO_RAW:
+ ret = iio_device_claim_direct_mode(idev);
+ if (ret)
+ return ret;
+
+ ret = bm1390_read_data(data, chan, val, val2);
+ iio_device_release_direct_mode(idev);
+ if (ret)
+ return ret;
+
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int __bm1390_fifo_flush(struct iio_dev *idev, unsigned int samples,
+ s64 timestamp)
+{
+ /* BM1390_FIFO_LENGTH is small so we shouldn't run out of stack */
+ struct bm1390_data_buf buffer[BM1390_FIFO_LENGTH];
+ struct bm1390_data *data = iio_priv(idev);
+ int smp_lvl, ret, i, warn, dummy;
+ u64 sample_period;
+ __be16 temp = 0;
+
+ ret = regmap_read(data->regmap, BM1390_REG_FIFO_LVL, &smp_lvl);
+ if (ret)
+ return ret;
+
+ smp_lvl = FIELD_GET(BM1390_MASK_FIFO_LVL, smp_lvl);
+ if (!smp_lvl)
+ return 0;
+
+ if (smp_lvl > BM1390_FIFO_LENGTH) {
+ /*
+ * The fifo holds maximum of 4 samples so valid values
+ * should be 0, 1, 2, 3, 4 - rest are probably bit errors
+ * in I2C line. Don't overflow if this happens.
+ */
+ dev_err(data->dev, "bad FIFO level %d\n", smp_lvl);
+ smp_lvl = BM1390_FIFO_LENGTH;
+ }
+
+ sample_period = timestamp - data->old_timestamp;
+ do_div(sample_period, smp_lvl);
+
+ if (samples && smp_lvl > samples)
+ smp_lvl = samples;
+
+
+ /*
+ * After some testing it appears that the temperature is not readable
+ * until the FIFO access has been done after the WMI. Thus, we need
+ * to read the all pressure values to memory and read the temperature
+ * only after that.
+ */
+ for (i = 0; i < smp_lvl; i++) {
+ /*
+ * When we start reading data from the FIFO the sensor goes to
+ * special FIFO reading mode. If any other register is accessed
+ * during the FIFO read, samples can be dropped. Prevent access
+ * until FIFO_LVL is read. We have mutex locked and we do also
+ * go performing reading of FIFO_LVL even if this read fails.
+ */
+ if (test_bit(BM1390_CHAN_PRESSURE, idev->active_scan_mask)) {
+ ret = bm1390_pressure_read(data, &buffer[i].pressure);
+ if (ret)
+ break;
+ }
+
+ /*
+ * Old timestamp is either the previous sample IRQ time,
+ * previous flush-time or, if this was first sample, the enable
+ * time. When we add a sample period to that we should get the
+ * best approximation of the time-stamp we are handling.
+ *
+ * Idea is to always keep the "old_timestamp" matching the
+ * timestamp which we are currently handling.
+ */
+ data->old_timestamp += sample_period;
+ buffer[i].ts = data->old_timestamp;
+ }
+ /* Reading the FIFO_LVL closes the FIFO access sequence */
+ warn = regmap_read(data->regmap, BM1390_REG_FIFO_LVL, &dummy);
+ if (warn)
+ dev_warn(data->dev, "Closing FIFO sequence failed\n");
+
+ if (ret)
+ return ret;
+
+ if (test_bit(BM1390_CHAN_TEMP, idev->active_scan_mask)) {
+ ret = regmap_bulk_read(data->regmap, BM1390_REG_TEMP_HI, &temp,
+ sizeof(temp));
+ if (ret)
+ return ret;
+ }
+
+ if (ret)
+ return ret;
+
+ for (i = 0; i < smp_lvl; i++) {
+ buffer[i].temp = temp;
+ iio_push_to_buffers(idev, &buffer[i]);
+ }
+
+ return smp_lvl;
+}
+
+static int bm1390_fifo_flush(struct iio_dev *idev, unsigned int samples)
+{
+ struct bm1390_data *data = iio_priv(idev);
+ s64 timestamp;
+ int ret;
+
+ /*
+ * If fifo_flush is being called from IRQ handler we know the stored
+ * timestamp is fairly accurate for the last stored sample. If we are
+ * called as a result of a read operation from userspace and hence
+ * before the watermark interrupt was triggered, take a timestamp
+ * now. We can fall anywhere in between two samples so the error in this
+ * case is at most one sample period.
+ * We need to have the IRQ disabled or we risk of messing-up
+ * the timestamps. If we are ran from IRQ, then the
+ * IRQF_ONESHOT has us covered - but if we are ran by the
+ * user-space read we need to disable the IRQ to be on a safe
+ * side. We do this usng synchronous disable so that if the
+ * IRQ thread is being ran on other CPU we wait for it to be
+ * finished.
+ */
+
+ timestamp = iio_get_time_ns(idev);
+ mutex_lock(&data->mutex);
+ ret = __bm1390_fifo_flush(idev, samples, timestamp);
+ mutex_unlock(&data->mutex);
+
+ return ret;
+}
+
+static int bm1390_set_watermark(struct iio_dev *idev, unsigned int val)
+{
+ struct bm1390_data *data = iio_priv(idev);
+
+ if (val < BM1390_WMI_MIN || val > BM1390_WMI_MAX)
+ return -EINVAL;
+
+ mutex_lock(&data->mutex);
+ data->watermark = val;
+ mutex_unlock(&data->mutex);
+
+ return 0;
+}
+
+static const struct iio_info bm1390_noirq_info = {
+ .read_raw = &bm1390_read_raw,
+};
+
+static const struct iio_info bm1390_info = {
+ .read_raw = &bm1390_read_raw,
+ .hwfifo_set_watermark = bm1390_set_watermark,
+ .hwfifo_flush_to_buffer = bm1390_fifo_flush,
+};
+
+static int bm1390_chip_init(struct bm1390_data *data)
+{
+ int ret;
+
+ ret = regmap_write_bits(data->regmap, BM1390_REG_POWER,
+ BM1390_MASK_POWER, BM1390_POWER_ON);
+ if (ret)
+ return ret;
+
+ msleep(1);
+
+ ret = regmap_write_bits(data->regmap, BM1390_REG_RESET,
+ BM1390_MASK_RESET, BM1390_RESET);
+ if (ret)
+ return ret;
+
+ msleep(1);
+
+ ret = regmap_write_bits(data->regmap, BM1390_REG_RESET,
+ BM1390_MASK_RESET, BM1390_RESET_RELEASE);
+ if (ret)
+ return ret;
+
+ msleep(1);
+
+ ret = regmap_reinit_cache(data->regmap, &bm1390_regmap);
+ if (ret) {
+ dev_err(data->dev, "Failed to reinit reg cache\n");
+ return ret;
+ }
+
+ /*
+ * Default to use IIR filter in "middle" mode. Also the AVE_NUM must
+ * be fixed when IIR is in use.
+ */
+ ret = regmap_update_bits(data->regmap, BM1390_REG_MODE_CTRL,
+ BM1390_MASK_AVE_NUM, BM1390_IIR_AVE_NUM);
+ if (ret)
+ return ret;
+
+ return regmap_update_bits(data->regmap, BM1390_REG_FIFO_CTRL,
+ BM1390_MASK_IIR_MODE, BM1390_IIR_MODE_MID);
+}
+
+static int bm1390_fifo_set_wmi(struct bm1390_data *data)
+{
+ u8 regval;
+
+ regval = FIELD_PREP(BM1390_MASK_FIFO_LEN,
+ data->watermark - BM1390_WMI_MIN);
+
+ return regmap_update_bits(data->regmap, BM1390_REG_FIFO_CTRL,
+ BM1390_MASK_FIFO_LEN, regval);
+}
+
+static int bm1390_fifo_enable(struct iio_dev *idev)
+{
+ struct bm1390_data *data = iio_priv(idev);
+ int ret;
+
+ /* We can't do buffered stuff without IRQ as we never get WMI */
+ if (data->irq <= 0)
+ return -EINVAL;
+
+ mutex_lock(&data->mutex);
+ if (data->trigger_enabled) {
+ ret = -EBUSY;
+ goto unlock_out;
+ }
+
+ /* Update watermark to HW */
+ ret = bm1390_fifo_set_wmi(data);
+ if (ret)
+ goto unlock_out;
+
+ /* Enable WMI_IRQ */
+ ret = regmap_set_bits(data->regmap, BM1390_REG_MODE_CTRL,
+ BM1390_MASK_WMI_EN);
+ if (ret)
+ goto unlock_out;
+
+ /* Enable FIFO */
+ ret = regmap_set_bits(data->regmap, BM1390_REG_FIFO_CTRL,
+ BM1390_MASK_FIFO_EN);
+ if (ret)
+ goto unlock_out;
+
+ data->state = BM1390_STATE_FIFO;
+
+ data->old_timestamp = iio_get_time_ns(idev);
+ ret = bm1390_meas_set(data, BM1390_MEAS_MODE_CONTINUOUS);
+
+unlock_out:
+ mutex_unlock(&data->mutex);
+
+ return ret;
+}
+
+static int bm1390_fifo_disable(struct iio_dev *idev)
+{
+ struct bm1390_data *data = iio_priv(idev);
+ int ret;
+
+ msleep(1);
+
+ mutex_lock(&data->mutex);
+ ret = bm1390_meas_set(data, BM1390_MEAS_MODE_STOP);
+ if (ret)
+ goto unlock_out;
+
+ /* Disable FIFO */
+ ret = regmap_clear_bits(data->regmap, BM1390_REG_FIFO_CTRL,
+ BM1390_MASK_FIFO_EN);
+ if (ret)
+ goto unlock_out;
+
+ data->state = BM1390_STATE_SAMPLE;
+
+ /* Disable WMI_IRQ */
+ ret = regmap_clear_bits(data->regmap, BM1390_REG_MODE_CTRL,
+ BM1390_MASK_WMI_EN);
+
+unlock_out:
+ mutex_unlock(&data->mutex);
+
+ return ret;
+}
+
+static int bm1390_buffer_postenable(struct iio_dev *idev)
+{
+ /*
+ * If we use data-ready trigger, then the IRQ masks should be handled by
+ * trigger enable and the hardware buffer is not used but we just update
+ * results to the IIO FIFO when data-ready triggers.
+ */
+ if (iio_device_get_current_mode(idev) == INDIO_BUFFER_TRIGGERED)
+ return 0;
+
+ return bm1390_fifo_enable(idev);
+}
+
+static int bm1390_buffer_predisable(struct iio_dev *idev)
+{
+ if (iio_device_get_current_mode(idev) == INDIO_BUFFER_TRIGGERED)
+ return 0;
+
+ return bm1390_fifo_disable(idev);
+}
+
+static const struct iio_buffer_setup_ops bm1390_buffer_ops = {
+ .postenable = bm1390_buffer_postenable,
+ .predisable = bm1390_buffer_predisable,
+};
+
+static irqreturn_t bm1390_trigger_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *idev = pf->indio_dev;
+ struct bm1390_data *data = iio_priv(idev);
+ int ret, status;
+
+ /* DRDY is acked by reading status reg */
+ ret = regmap_read(data->regmap, BM1390_REG_STATUS, &status);
+ if (ret || !status)
+ return IRQ_NONE;
+
+ dev_dbg(data->dev, "DRDY trig status 0x%x\n", status);
+
+ if (test_bit(BM1390_CHAN_PRESSURE, idev->active_scan_mask)) {
+ ret = bm1390_pressure_read(data, &data->buf.pressure);
+ if (ret) {
+ dev_warn(data->dev, "sample read failed %d\n", ret);
+ return IRQ_NONE;
+ }
+ }
+
+ if (test_bit(BM1390_CHAN_TEMP, idev->active_scan_mask)) {
+ ret = regmap_bulk_read(data->regmap, BM1390_REG_TEMP_HI,
+ &data->buf.temp, sizeof(data->buf.temp));
+ if (ret) {
+ dev_warn(data->dev, "temp read failed %d\n", ret);
+ return IRQ_HANDLED;
+ }
+ }
+
+ iio_push_to_buffers_with_timestamp(idev, &data->buf, data->timestamp);
+ iio_trigger_notify_done(idev->trig);
+
+ return IRQ_HANDLED;
+}
+
+/* Get timestamps and wake the thread if we need to read data */
+static irqreturn_t bm1390_irq_handler(int irq, void *private)
+{
+ struct iio_dev *idev = private;
+ struct bm1390_data *data = iio_priv(idev);
+
+ data->timestamp = iio_get_time_ns(idev);
+
+ if (data->state == BM1390_STATE_FIFO || data->trigger_enabled)
+ return IRQ_WAKE_THREAD;
+
+ return IRQ_NONE;
+}
+
+static irqreturn_t bm1390_irq_thread_handler(int irq, void *private)
+{
+ struct iio_dev *idev = private;
+ struct bm1390_data *data = iio_priv(idev);
+ int ret = IRQ_NONE;
+
+ mutex_lock(&data->mutex);
+
+ if (data->trigger_enabled) {
+ iio_trigger_poll_nested(data->trig);
+ ret = IRQ_HANDLED;
+ } else if (data->state == BM1390_STATE_FIFO) {
+ int ok;
+
+ ok = __bm1390_fifo_flush(idev, BM1390_FIFO_LENGTH,
+ data->timestamp);
+ if (ok > 0)
+ ret = IRQ_HANDLED;
+ }
+
+ mutex_unlock(&data->mutex);
+
+ return ret;
+}
+
+static int bm1390_set_drdy_irq(struct bm1390_data *data, bool en)
+{
+ if (en)
+ return regmap_set_bits(data->regmap, BM1390_REG_MODE_CTRL,
+ BM1390_MASK_DRDY_EN);
+ return regmap_clear_bits(data->regmap, BM1390_REG_MODE_CTRL,
+ BM1390_MASK_DRDY_EN);
+}
+
+static int bm1390_trigger_set_state(struct iio_trigger *trig,
+ bool state)
+{
+ struct bm1390_data *data = iio_trigger_get_drvdata(trig);
+ int ret = 0;
+
+ mutex_lock(&data->mutex);
+
+ if (data->trigger_enabled == state)
+ goto unlock_out;
+
+ if (data->state == BM1390_STATE_FIFO) {
+ dev_warn(data->dev, "Can't set trigger when FIFO enabled\n");
+ ret = -EBUSY;
+ goto unlock_out;
+ }
+
+ data->trigger_enabled = state;
+
+ if (state) {
+ ret = bm1390_meas_set(data, BM1390_MEAS_MODE_CONTINUOUS);
+ if (ret)
+ goto unlock_out;
+ } else {
+ int dummy;
+
+ ret = bm1390_meas_set(data, BM1390_MEAS_MODE_STOP);
+ if (ret)
+ goto unlock_out;
+
+ /*
+ * We need to read the status register in order to ACK the
+ * data-ready which may have been generated just before we
+ * disabled the measurement.
+ */
+ ret = regmap_read(data->regmap, BM1390_REG_STATUS, &dummy);
+ if (ret)
+ dev_warn(data->dev, "status read failed\n");
+ }
+
+ ret = bm1390_set_drdy_irq(data, state);
+
+unlock_out:
+ mutex_unlock(&data->mutex);
+
+ return ret;
+}
+
+static const struct iio_trigger_ops bm1390_trigger_ops = {
+ .set_trigger_state = bm1390_trigger_set_state,
+};
+
+static int bm1390_setup_buffer(struct bm1390_data *data, struct iio_dev *idev)
+{
+ int ret;
+
+ ret = devm_iio_triggered_buffer_setup(data->dev, idev,
+ &iio_pollfunc_store_time,
+ &bm1390_trigger_handler,
+ &bm1390_buffer_ops);
+
+ if (ret)
+ return dev_err_probe(data->dev, ret,
+ "iio_triggered_buffer_setup FAIL\n");
+
+ idev->available_scan_masks = bm1390_scan_masks;
+
+ return 0;
+}
+
+static int bm1390_setup_trigger(struct bm1390_data *data, struct iio_dev *idev,
+ int irq)
+{
+ struct iio_trigger *itrig;
+ char *name;
+ int ret;
+
+ itrig = devm_iio_trigger_alloc(data->dev, "%sdata-rdy-dev%d", idev->name,
+ iio_device_id(idev));
+ if (!itrig)
+ return -ENOMEM;
+
+ data->trig = itrig;
+
+ itrig->ops = &bm1390_trigger_ops;
+ iio_trigger_set_drvdata(itrig, data);
+
+ name = devm_kasprintf(data->dev, GFP_KERNEL, "%s-bm1390",
+ dev_name(data->dev));
+ if (name == NULL)
+ return -ENOMEM;
+
+ ret = devm_request_threaded_irq(data->dev, irq, bm1390_irq_handler,
+ &bm1390_irq_thread_handler,
+ IRQF_ONESHOT, name, idev);
+ if (ret)
+ return dev_err_probe(data->dev, ret, "Could not request IRQ\n");
+
+
+ ret = devm_iio_trigger_register(data->dev, itrig);
+ if (ret)
+ return dev_err_probe(data->dev, ret,
+ "Trigger registration failed\n");
+
+ return 0;
+}
+
+static int bm1390_probe(struct i2c_client *i2c)
+{
+ struct bm1390_data *data;
+ struct regmap *regmap;
+ struct iio_dev *idev;
+ struct device *dev;
+ unsigned int part_id;
+ int ret;
+
+ dev = &i2c->dev;
+
+ regmap = devm_regmap_init_i2c(i2c, &bm1390_regmap);
+ if (IS_ERR(regmap))
+ return dev_err_probe(dev, PTR_ERR(regmap),
+ "Failed to initialize Regmap\n");
+
+ ret = devm_regulator_get_enable(dev, "vdd");
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to get regulator\n");
+
+ ret = regmap_read(regmap, BM1390_REG_PART_ID, &part_id);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to access sensor\n");
+
+ if (part_id != BM1390_ID)
+ dev_warn(dev, "unknown device 0x%x\n", part_id);
+
+ idev = devm_iio_device_alloc(dev, sizeof(*data));
+ if (!idev)
+ return -ENOMEM;
+
+ data = iio_priv(idev);
+ data->regmap = regmap;
+ data->dev = dev;
+ data->irq = i2c->irq;
+ /*
+ * For now we just allow BM1390_WMI_MIN to BM1390_WMI_MAX and
+ * discard every other configuration when triggered mode is not used.
+ */
+ data->watermark = BM1390_WMI_MAX;
+ mutex_init(&data->mutex);
+
+ idev->channels = bm1390_channels;
+ idev->num_channels = ARRAY_SIZE(bm1390_channels);
+ idev->name = "bm1390";
+ idev->modes = INDIO_DIRECT_MODE;
+
+ ret = bm1390_chip_init(data);
+ if (ret)
+ return dev_err_probe(dev, ret, "sensor init failed\n");
+
+ ret = bm1390_setup_buffer(data, idev);
+ if (ret)
+ return ret;
+
+ /* No trigger if we don't have IRQ for data-ready and WMI */
+ if (i2c->irq > 0) {
+ idev->info = &bm1390_info;
+ idev->modes |= INDIO_BUFFER_SOFTWARE;
+ ret = bm1390_setup_trigger(data, idev, i2c->irq);
+ if (ret)
+ return ret;
+ } else {
+ idev->info = &bm1390_noirq_info;
+ }
+
+ ret = devm_iio_device_register(dev, idev);
+ if (ret < 0)
+ return dev_err_probe(dev, ret,
+ "Unable to register iio device\n");
+
+ return 0;
+}
+
+static const struct of_device_id bm1390_of_match[] = {
+ { .compatible = "rohm,bm1390glv-z" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, bm1390_of_match);
+
+static const struct i2c_device_id bm1390_id[] = {
+ { "bm1390glv-z", },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, bm1390_id);
+
+static struct i2c_driver bm1390_driver = {
+ .driver = {
+ .name = "bm1390",
+ .of_match_table = bm1390_of_match,
+ /*
+ * Probing explicitly requires a few millisecond of sleep.
+ * Enabling the VDD regulator may include ramp up rates.
+ */
+ .probe_type = PROBE_PREFER_ASYNCHRONOUS,
+ },
+ .probe = bm1390_probe,
+ .id_table = bm1390_id,
+};
+module_i2c_driver(bm1390_driver);
+
+MODULE_AUTHOR("Matti Vaittinen <mazziesaccount@gmail.com>");
+MODULE_DESCRIPTION("Driver for ROHM BM1390 pressure sensor");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 16:44:14 +0000