[PATCH 1/5] iio: adc: ad7606: Move oversampling and scale options to chip info
From: Beniamin Bia
Date: Thu May 16 2019 - 10:33:41 EST
The device dependent options which are going to be different for devices
which will be supported in the future by this driver,
were moved in chip info for a more generic driver. This patch allows
supporting more devices by the driver. Also, it is an intermediate
step of adding support for ad7616 in software mode.
Signed-off-by: Beniamin Bia <beniamin.bia@xxxxxxxxxx>
---
drivers/iio/adc/ad7606.c | 61 +++++++++++++++++++++++++++++-----------
drivers/iio/adc/ad7606.h | 15 +++++++++-
2 files changed, 58 insertions(+), 18 deletions(-)
diff --git a/drivers/iio/adc/ad7606.c b/drivers/iio/adc/ad7606.c
index 24c70c3cefb4..c66ff22f32d2 100644
--- a/drivers/iio/adc/ad7606.c
+++ b/drivers/iio/adc/ad7606.c
@@ -158,7 +158,7 @@ static int ad7606_read_raw(struct iio_dev *indio_dev,
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
*val = 0;
- *val2 = st->scale_avail[st->range];
+ *val2 = st->scale_avail[st->range[0]];
return IIO_VAL_INT_PLUS_MICRO;
case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
*val = st->oversampling;
@@ -194,6 +194,32 @@ static ssize_t in_voltage_scale_available_show(struct device *dev,
static IIO_DEVICE_ATTR_RO(in_voltage_scale_available, 0);
+static int ad7606_write_scale_hw(struct iio_dev *indio_dev, int ch, int val)
+{
+ struct ad7606_state *st = iio_priv(indio_dev);
+
+ gpiod_set_value(st->gpio_range, val);
+
+ return 0;
+}
+
+static int ad7606_write_os_hw(struct iio_dev *indio_dev, int val)
+{
+ struct ad7606_state *st = iio_priv(indio_dev);
+ DECLARE_BITMAP(values, 3);
+
+ values[0] = val;
+
+ gpiod_set_array_value(ARRAY_SIZE(values), st->gpio_os->desc,
+ st->gpio_os->info, values);
+
+ /* AD7616 requires a reset to update value */
+ if (st->chip_info->os_req_reset)
+ ad7606_reset(st);
+
+ return 0;
+}
+
static int ad7606_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val,
@@ -201,15 +227,18 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
long mask)
{
struct ad7606_state *st = iio_priv(indio_dev);
- DECLARE_BITMAP(values, 3);
- int i;
+ int i, ret, ch = 0;
switch (mask) {
case IIO_CHAN_INFO_SCALE:
mutex_lock(&st->lock);
i = find_closest(val2, st->scale_avail, st->num_scales);
- gpiod_set_value(st->gpio_range, i);
- st->range = i;
+ ret = st->write_scale(indio_dev, chan->address, i);
+ if (ret < 0) {
+ mutex_unlock(&st->lock);
+ return ret;
+ }
+ st->range[ch] = i;
mutex_unlock(&st->lock);
return 0;
@@ -218,17 +247,12 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
return -EINVAL;
i = find_closest(val, st->oversampling_avail,
st->num_os_ratios);
-
- values[0] = i;
-
mutex_lock(&st->lock);
- gpiod_set_array_value(ARRAY_SIZE(values), st->gpio_os->desc,
- st->gpio_os->info, values);
-
- /* AD7616 requires a reset to update value */
- if (st->chip_info->os_req_reset)
- ad7606_reset(st);
-
+ ret = st->write_os(indio_dev, i);
+ if (ret < 0) {
+ mutex_unlock(&st->lock);
+ return ret;
+ }
st->oversampling = st->oversampling_avail[i];
mutex_unlock(&st->lock);
@@ -536,7 +560,7 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
st->bops = bops;
st->base_address = base_address;
/* tied to logic low, analog input range is +/- 5V */
- st->range = 0;
+ st->range[0] = 0;
st->oversampling = 1;
st->scale_avail = ad7606_scale_avail;
st->num_scales = ARRAY_SIZE(ad7606_scale_avail);
@@ -589,6 +613,9 @@ 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");
+ st->write_scale = ad7606_write_scale_hw;
+ st->write_os = ad7606_write_os_hw;
+
st->trig = devm_iio_trigger_alloc(dev, "%s-dev%d",
indio_dev->name, indio_dev->id);
if (!st->trig)
@@ -643,7 +670,7 @@ static int ad7606_resume(struct device *dev)
struct ad7606_state *st = iio_priv(indio_dev);
if (st->gpio_standby) {
- gpiod_set_value(st->gpio_range, st->range);
+ gpiod_set_value(st->gpio_range, st->range[0]);
gpiod_set_value(st->gpio_standby, 1);
ad7606_reset(st);
}
diff --git a/drivers/iio/adc/ad7606.h b/drivers/iio/adc/ad7606.h
index f9ef52131e74..143c30163df9 100644
--- a/drivers/iio/adc/ad7606.h
+++ b/drivers/iio/adc/ad7606.h
@@ -16,6 +16,12 @@
* oversampling ratios.
* @oversampling_num number of elements stored in oversampling_avail array
* @os_req_reset some devices require a reset to update oversampling
+ * @write_scale_sw pointer to the function which writes the scale via spi
+ in software mode
+ * @write_os_sw pointer to the function which writes the os via spi
+ in software mode
+ * @sw_mode_config: pointer to a function which configured the device
+ * for software mode
*/
struct ad7606_chip_info {
const struct iio_chan_spec *channels;
@@ -23,6 +29,9 @@ struct ad7606_chip_info {
const unsigned int *oversampling_avail;
unsigned int oversampling_num;
bool os_req_reset;
+ int (*write_scale_sw)(struct iio_dev *indio_dev, int ch, int val);
+ int (*write_os_sw)(struct iio_dev *indio_dev, int val);
+ int (*sw_mode_config)(struct iio_dev *indio_dev);
};
/**
@@ -39,6 +48,8 @@ struct ad7606_chip_info {
* @oversampling_avail pointer to the array which stores the available
* oversampling ratios.
* @num_os_ratios number of elements stored in oversampling_avail array
+ * @write_scale pointer to the function which writes the scale
+ * @write_os pointer to the function which writes the os
* @lock protect sensor state from concurrent accesses to GPIOs
* @gpio_convst GPIO descriptor for conversion start signal (CONVST)
* @gpio_reset GPIO descriptor for device hard-reset
@@ -57,13 +68,15 @@ struct ad7606_state {
const struct ad7606_chip_info *chip_info;
struct regulator *reg;
const struct ad7606_bus_ops *bops;
- unsigned int range;
+ unsigned int range[16];
unsigned int oversampling;
void __iomem *base_address;
const unsigned int *scale_avail;
unsigned int num_scales;
const unsigned int *oversampling_avail;
unsigned int num_os_ratios;
+ int (*write_scale)(struct iio_dev *indio_dev, int ch, int val);
+ int (*write_os)(struct iio_dev *indio_dev, int val);
struct mutex lock; /* protect sensor state */
struct gpio_desc *gpio_convst;
--
2.17.1