[PATCH 4/5] iio: adc: ad7606: Add support for software mode for ad7616
From: Beniamin Bia
Date: Thu May 16 2019 - 10:34:07 EST
Support for ad7616 running in software was added. In order
to activate the software mode, HW_RNGSEL pins must be pulled low.
Oversampling and input ranges are now configured in corresponding
registers. Ad7616 has multiple scale options when it is configured
in software mode.
Signed-off-by: Beniamin Bia <beniamin.bia@xxxxxxxxxx>
---
drivers/iio/adc/ad7606.c | 111 ++++++++++++++++++++++++++++++++++++---
1 file changed, 103 insertions(+), 8 deletions(-)
diff --git a/drivers/iio/adc/ad7606.c b/drivers/iio/adc/ad7606.c
index 6df81117cacc..f77df3efe43f 100644
--- a/drivers/iio/adc/ad7606.c
+++ b/drivers/iio/adc/ad7606.c
@@ -29,6 +29,20 @@
#include "ad7606.h"
+#define AD7606_RANGE_CH_ADDR(ch) (0x03 + ((ch) >> 1))
+#define AD7606_OS_MODE 0x08
+
+#define AD7616_CONFIGURATION_REGISTER 0x02
+#define AD7616_OS_MASK GENMASK(4, 2)
+#define AD7616_BURST_MODE BIT(6)
+#define AD7616_SEQEN_MODE BIT(5)
+#define AD7616_RANGE_CH_ADDR_OFF 0x04
+#define AD7616_RANGE_CH_ADDR(ch) ((((ch) & 0x1) << 1) + ((ch) >> 3))
+#define AD7616_RANGE_CH_MSK(ch) (GENMASK(1, 0) << ((ch) & 0x6))
+#define AD7616_RANGE_CH_MODE(ch, mode) ((mode) << (ch & GENMASK(2, 1)))
+
+static int ad7616_sw_mode_config(struct iio_dev *indio_dev);
+
/*
* Scales are computed as 5000/32768 and 10000/32768 respectively,
* so that when applied to the raw values they provide mV values
@@ -37,6 +51,11 @@ static const unsigned int ad7606_scale_avail[2] = {
152588, 305176
};
+
+static const unsigned int ad7616_sw_scale_avail[3] = {
+ 76293, 152588, 305176
+};
+
static const unsigned int ad7606_oversampling_avail[7] = {
1, 2, 4, 8, 16, 32, 64,
};
@@ -282,6 +301,26 @@ static int ad7606_write_os_hw(struct iio_dev *indio_dev, int val)
return 0;
}
+static int ad7616_write_scale_sw(struct iio_dev *indio_dev, int ch, int val)
+{
+ struct ad7606_state *st = iio_priv(indio_dev);
+ unsigned int ch_addr, mode;
+
+ ch_addr = AD7616_RANGE_CH_ADDR_OFF + AD7616_RANGE_CH_ADDR(ch);
+ mode = AD7616_RANGE_CH_MODE(ch, ((val + 1) & 0x3));
+
+ return ad7606_spi_write_mask(st, ch_addr, AD7616_RANGE_CH_MSK(ch),
+ mode);
+}
+
+static int ad7616_write_os_sw(struct iio_dev *indio_dev, int val)
+{
+ struct ad7606_state *st = iio_priv(indio_dev);
+
+ return ad7606_spi_write_mask(st, AD7616_CONFIGURATION_REGISTER,
+ AD7616_OS_MASK, val << 2);
+}
+
static int ad7606_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val,
@@ -368,14 +407,14 @@ static const struct attribute_group ad7606_attribute_group_range = {
.attrs = ad7606_attributes_range,
};
-#define AD760X_CHANNEL(num, mask) { \
+#define AD760X_CHANNEL(num, mask_sep, mask_type, mask_all) { \
.type = IIO_VOLTAGE, \
.indexed = 1, \
.channel = num, \
.address = num, \
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
- .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\
- .info_mask_shared_by_all = mask, \
+ .info_mask_separate = mask_sep, \
+ .info_mask_shared_by_type = mask_type, \
+ .info_mask_shared_by_all = mask_all, \
.scan_index = num, \
.scan_type = { \
.sign = 's', \
@@ -385,11 +424,18 @@ static const struct attribute_group ad7606_attribute_group_range = {
}, \
}
-#define AD7605_CHANNEL(num) \
- AD760X_CHANNEL(num, 0)
+#define AD7605_CHANNEL(num) \
+ AD760X_CHANNEL(num, BIT(IIO_CHAN_INFO_RAW), \
+ BIT(IIO_CHAN_INFO_SCALE), 0)
+
+#define AD7606_CHANNEL(num) \
+ AD760X_CHANNEL(num, BIT(IIO_CHAN_INFO_RAW), \
+ BIT(IIO_CHAN_INFO_SCALE), \
+ BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO))
-#define AD7606_CHANNEL(num) \
- AD760X_CHANNEL(num, BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO))
+#define AD7616_CHANNEL(num) \
+ AD760X_CHANNEL(num, BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),\
+ 0, BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO))
static const struct iio_chan_spec ad7605_channels[] = {
IIO_CHAN_SOFT_TIMESTAMP(4),
@@ -441,6 +487,26 @@ static const struct iio_chan_spec ad7616_channels[] = {
AD7606_CHANNEL(15),
};
+static const struct iio_chan_spec ad7616_sw_channels[] = {
+ IIO_CHAN_SOFT_TIMESTAMP(16),
+ AD7616_CHANNEL(0),
+ AD7616_CHANNEL(1),
+ AD7616_CHANNEL(2),
+ AD7616_CHANNEL(3),
+ AD7616_CHANNEL(4),
+ AD7616_CHANNEL(5),
+ AD7616_CHANNEL(6),
+ AD7616_CHANNEL(7),
+ AD7616_CHANNEL(8),
+ AD7616_CHANNEL(9),
+ AD7616_CHANNEL(10),
+ AD7616_CHANNEL(11),
+ AD7616_CHANNEL(12),
+ AD7616_CHANNEL(13),
+ AD7616_CHANNEL(14),
+ AD7616_CHANNEL(15),
+};
+
static const struct ad7606_chip_info ad7606_chip_info_tbl[] = {
/* More devices added in future */
[ID_AD7605_4] = {
@@ -468,9 +534,13 @@ static const struct ad7606_chip_info ad7606_chip_info_tbl[] = {
[ID_AD7616] = {
.channels = ad7616_channels,
.num_channels = 17,
+ .sw_mode_config = ad7616_sw_mode_config,
.oversampling_avail = ad7616_oversampling_avail,
.oversampling_num = ARRAY_SIZE(ad7616_oversampling_avail),
.os_req_reset = true,
+ .spi_rd_wr_cmd = ad7616_spi_rd_wr_cmd,
+ .write_scale_sw = ad7616_write_scale_sw,
+ .write_os_sw = ad7616_write_os_sw,
},
};
@@ -604,6 +674,23 @@ static void ad7606_regulator_disable(void *data)
regulator_disable(st->reg);
}
+static int ad7616_sw_mode_config(struct iio_dev *indio_dev)
+{
+ struct ad7606_state *st = iio_priv(indio_dev);
+
+ /*
+ * Scale can be configured individually for each channel
+ * in software mode.
+ */
+ indio_dev->channels = ad7616_sw_channels;
+
+ /* Activate Burst mode and SEQEN MODE */
+ return ad7606_spi_write_mask(st,
+ AD7616_CONFIGURATION_REGISTER,
+ AD7616_BURST_MODE | AD7616_SEQEN_MODE,
+ AD7616_BURST_MODE | AD7616_SEQEN_MODE);
+}
+
int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
const char *name, unsigned int id,
const struct ad7606_bus_ops *bops)
@@ -677,6 +764,10 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
if (ret)
dev_warn(st->dev, "failed to RESET: no RESET GPIO specified\n");
+ /* AD7616 requires al least 15ms to reconfigure after a reset */
+ if (msleep_interruptible(15))
+ return -ERESTARTSYS;
+
st->write_scale = ad7606_write_scale_hw;
st->write_os = ad7606_write_os_hw;
@@ -685,6 +776,10 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
"adi,sw-mode");
if (st->sw_mode_en) {
+ /* Scale of 0.076293 is only available in sw mode */
+ st->scale_avail = ad7616_sw_scale_avail;
+ st->num_scales = ARRAY_SIZE(ad7616_sw_scale_avail);
+
/* After reset, in software mode, Â10 V is set by default */
memset32(st->range, 2, ARRAY_SIZE(st->range));
indio_dev->info = &ad7606_info_os_and_range;
--
2.17.1