Based on bindings/iio/proximity/semtech,sx9324.yaml, implement
retrieving sensor hardware property and alter default values.
Signed-off-by: Gwendal Grignou <gwendal@xxxxxxxxxxxx>
---
Changes in v5:
- Use prefixed binding names.
- Fix long lines.
Changes in v4:
- Fix spelling in commit title.
Changes in v3:
- Remove duplicate information.
- Use intervals instead of enum.
- Fix filter description.
Changes in v2:
- Fix interrupt documentation wording.
drivers/iio/proximity/sx9324.c | 164 +++++++++++++++++++++++++++++++++
1 file changed, 164 insertions(+)
diff --git a/drivers/iio/proximity/sx9324.c b/drivers/iio/proximity/sx9324.c
index a27aae64e6d4e1..86b7c83ea644e8 100644
--- a/drivers/iio/proximity/sx9324.c
+++ b/drivers/iio/proximity/sx9324.c
@@ -77,6 +77,7 @@
#define SX9324_REG_PROX_CTRL0 0x30
#define SX9324_REG_PROX_CTRL0_GAIN_MASK GENMASK(5, 3)
#define SX9324_REG_PROX_CTRL0_GAIN_1 0x80
+#define SX9324_REG_PROX_CTRL0_RAWFILT_MASK GENMASK(2, 0)
#define SX9324_REG_PROX_CTRL0_RAWFILT_1P50 0x01
#define SX9324_REG_PROX_CTRL1 0x31
#define SX9324_REG_PROX_CTRL2 0x32
@@ -751,6 +752,74 @@ static int sx9324_write_raw(struct iio_dev *indio_dev,
return -EINVAL;
}
+static const struct sx_common_reg_default sx9324_default_regs[] = {
+ { SX9324_REG_IRQ_MSK, 0x00 },
+ { SX9324_REG_IRQ_CFG0, 0x00 },
+ { SX9324_REG_IRQ_CFG1, SX9324_REG_IRQ_CFG1_FAILCOND },
+ { SX9324_REG_IRQ_CFG2, 0x00 },
+ { SX9324_REG_GNRL_CTRL0, SX9324_REG_GNRL_CTRL0_SCANPERIOD_100MS },
+ /*
+ * The lower 4 bits should not be set as it enable sensors measurements.
+ * Turning the detection on before the configuration values are set to
+ * good values can cause the device to return erroneous readings.
+ */
+ { SX9324_REG_GNRL_CTRL1, SX9324_REG_GNRL_CTRL1_PAUSECTRL },
+
+ { SX9324_REG_AFE_CTRL0, 0x00 },
+ { SX9324_REG_AFE_CTRL3, 0x00 },
+ { SX9324_REG_AFE_CTRL4, SX9324_REG_AFE_CTRL4_FREQ_83_33HZ |
+ SX9324_REG_AFE_CTRL4_RES_100 },
+ { SX9324_REG_AFE_CTRL6, 0x00 },
+ { SX9324_REG_AFE_CTRL7, SX9324_REG_AFE_CTRL4_FREQ_83_33HZ |
+ SX9324_REG_AFE_CTRL4_RES_100 },
+
+ /* TODO(gwendal): PHx use chip default or all grounded? */
+ { SX9324_REG_AFE_PH0, 0x29 },
+ { SX9324_REG_AFE_PH1, 0x26 },
+ { SX9324_REG_AFE_PH2, 0x1a },
+ { SX9324_REG_AFE_PH3, 0x16 },
+
+ { SX9324_REG_AFE_CTRL8, SX9324_REG_AFE_CTRL8_RESFILTN_4KOHM },
+ { SX9324_REG_AFE_CTRL9, SX9324_REG_AFE_CTRL9_AGAIN_1 },
+
+ { SX9324_REG_PROX_CTRL0, SX9324_REG_PROX_CTRL0_GAIN_1 |
+ SX9324_REG_PROX_CTRL0_RAWFILT_1P50 },
+ { SX9324_REG_PROX_CTRL1, SX9324_REG_PROX_CTRL0_GAIN_1 |
+ SX9324_REG_PROX_CTRL0_RAWFILT_1P50 },
+ { SX9324_REG_PROX_CTRL2, SX9324_REG_PROX_CTRL2_AVGNEG_THRESH_16K },
+ { SX9324_REG_PROX_CTRL3, SX9324_REG_PROX_CTRL3_AVGDEB_2SAMPLES |
+ SX9324_REG_PROX_CTRL3_AVGPOS_THRESH_16K },
+ { SX9324_REG_PROX_CTRL4, SX9324_REG_PROX_CTRL4_AVGNEG_FILT_2 |
+ SX9324_REG_PROX_CTRL3_AVGPOS_FILT_256 },
+ { SX9324_REG_PROX_CTRL5, 0x00 },
+ { SX9324_REG_PROX_CTRL6, SX9324_REG_PROX_CTRL6_PROXTHRESH_32 },
+ { SX9324_REG_PROX_CTRL7, SX9324_REG_PROX_CTRL6_PROXTHRESH_32 },
+ { SX9324_REG_ADV_CTRL0, 0x00 },
+ { SX9324_REG_ADV_CTRL1, 0x00 },
+ { SX9324_REG_ADV_CTRL2, 0x00 },
+ { SX9324_REG_ADV_CTRL3, 0x00 },
+ { SX9324_REG_ADV_CTRL4, 0x00 },
+ { SX9324_REG_ADV_CTRL5, SX9324_REG_ADV_CTRL5_STARTUP_SENSOR_1 |
+ SX9324_REG_ADV_CTRL5_STARTUP_METHOD_1 },
+ { SX9324_REG_ADV_CTRL6, 0x00 },
+ { SX9324_REG_ADV_CTRL7, 0x00 },
+ { SX9324_REG_ADV_CTRL8, 0x00 },
+ { SX9324_REG_ADV_CTRL9, 0x00 },
+ /* Body/Table threshold */
+ { SX9324_REG_ADV_CTRL10, 0x00 },
+ { SX9324_REG_ADV_CTRL11, 0x00 },
+ { SX9324_REG_ADV_CTRL12, 0x00 },
+ /* TODO(gwendal): SAR currenly disabled */
+ { SX9324_REG_ADV_CTRL13, 0x00 },
+ { SX9324_REG_ADV_CTRL14, 0x00 },
+ { SX9324_REG_ADV_CTRL15, 0x00 },
+ { SX9324_REG_ADV_CTRL16, 0x00 },
+ { SX9324_REG_ADV_CTRL17, 0x00 },
+ { SX9324_REG_ADV_CTRL18, 0x00 },
+ { SX9324_REG_ADV_CTRL19, SX9324_REG_ADV_CTRL19_HIGHT_FAILURE_THRESH_SATURATION },
+ { SX9324_REG_ADV_CTRL20, SX9324_REG_ADV_CTRL19_HIGHT_FAILURE_THRESH_SATURATION },
+};
+
/* Activate all channels and perform an initial compensation. */
static int sx9324_init_compensation(struct iio_dev *indio_dev)
{
@@ -775,6 +844,99 @@ static int sx9324_init_compensation(struct iio_dev *indio_dev)
return ret;
}
+static const struct sx_common_reg_default *
+sx9324_get_default_reg(struct device *dev, int idx,
+ struct sx_common_reg_default *reg_def)
+{
+#define SX9324_PIN_DEF "semtech,ph0-pin"
+#define SX9324_RESOLUTION_DEF "semtech,ph01-resolution"
+#define SX9324_PROXRAW_DEF "semtech,ph01-proxraw-strength"
+ unsigned int pin_defs[SX9324_NUM_PINS];
+ char prop[] = SX9324_PROXRAW_DEF;
+ u32 start = 0, raw = 0, pos = 0;
+ int ret, count, ph, pin;
+
+ memcpy(reg_def, &sx9324_default_regs[idx], sizeof(*reg_def));
+ switch (reg_def->reg) {
+ case SX9324_REG_AFE_PH0:
+ case SX9324_REG_AFE_PH1:
+ case SX9324_REG_AFE_PH2:
+ case SX9324_REG_AFE_PH3:
+ ph = reg_def->reg - SX9324_REG_AFE_PH0;
+ scnprintf(prop, ARRAY_SIZE(prop), "semtech,ph%d-pin", ph);
+
+ count = device_property_count_u32(dev, prop);
+ if (count != ARRAY_SIZE(pin_defs))
+ break;
+ ret = device_property_read_u32_array(dev, prop, pin_defs,
+ ARRAY_SIZE(pin_defs));
+ for (pin = 0; pin < SX9324_NUM_PINS; pin++)
+ raw |= (pin_defs[pin] << (2 * pin)) &
+ SX9324_REG_AFE_PH0_PIN_MASK(pin);
+ reg_def->def = raw;
+ break;
+ case SX9324_REG_AFE_CTRL4:
+ case SX9324_REG_AFE_CTRL7:
+ if (reg_def->reg == SX9324_REG_AFE_CTRL4)
+ strncpy(prop, "semtech,ph01-resolution",
+ ARRAY_SIZE(prop));
+ else
+ strncpy(prop, "semtech,ph23-resolution",
+ ARRAY_SIZE(prop));
+
+ ret = device_property_read_u32(dev, prop, &raw);
+ if (ret)
+ break;
+
+ raw = ilog2(raw) - 3;
+
+ reg_def->def &= ~SX9324_REG_AFE_CTRL4_RESOLUTION_MASK;
+ reg_def->def |= FIELD_PREP(SX9324_REG_AFE_CTRL4_RESOLUTION_MASK,
+ raw);
+ break;
+ case SX9324_REG_ADV_CTRL5:
+ ret = device_property_read_u32(dev, "semtech,startup-sensor",
+ &start);
+ if (ret)
+ break;
+
+ reg_def->def &= ~SX9324_REG_ADV_CTRL5_STARTUPSENS_MASK;
+ reg_def->def |= FIELD_PREP(SX9324_REG_ADV_CTRL5_STARTUPSENS_MASK,
+ start);
+ break;
+ case SX9324_REG_PROX_CTRL4:
+ ret = device_property_read_u32(dev, "semtech,avg-pos-strength",
+ &pos);
+ if (ret)
+ break;
+
+ /* Powers of 2, except for a gap between 16 and 64 */
+ raw = clamp(ilog2(pos), 3, 11) - (pos >= 32 ? 4 : 3);
+
+ reg_def->def &= ~SX9324_REG_PROX_CTRL4_AVGPOSFILT_MASK;
+ reg_def->def |= FIELD_PREP(SX9324_REG_PROX_CTRL4_AVGPOSFILT_MASK,
+ raw);
+ break;
+ case SX9324_REG_PROX_CTRL0:
+ case SX9324_REG_PROX_CTRL1:
+ if (reg_def->reg == SX9324_REG_PROX_CTRL0)
+ strncpy(prop, "semtech,ph01-proxraw-strength",
+ ARRAY_SIZE(prop));
+ else
+ strncpy(prop, "semtech,ph23-proxraw-strength",
+ ARRAY_SIZE(prop));
+ ret = device_property_read_u32(dev, prop, &raw);
+ if (ret)
+ break;
+
+ reg_def->def &= ~SX9324_REG_PROX_CTRL0_RAWFILT_MASK;
+ reg_def->def |= FIELD_PREP(SX9324_REG_PROX_CTRL0_RAWFILT_MASK,
+ raw);
+ break;
+ }
+ return reg_def;
+}
+
static int sx9324_check_whoami(struct device *dev,
struct iio_dev *indio_dev)
{
@@ -795,12 +957,14 @@ static const struct sx_common_chip_info sx9324_chip_info = {
.mask_enable_chan = SX9324_REG_GNRL_CTRL1_PHEN_MASK,
.irq_msk_offset = 3,
.num_channels = SX9324_NUM_CHANNELS,
+ .num_default_regs = ARRAY_SIZE(sx9324_default_regs),
.ops = {
.read_prox_data = sx9324_read_prox_data,
.check_whoami = sx9324_check_whoami,
.init_compensation = sx9324_init_compensation,
.wait_for_sample = sx9324_wait_for_sample,
+ .get_default_reg = sx9324_get_default_reg,
},
.iio_channels = sx9324_channels,
--
2.34.1.400.ga245620fadb-goog
