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path: root/drivers/iio/adc
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-rw-r--r--drivers/iio/adc/Kconfig3
-rw-r--r--drivers/iio/adc/at91_adc.c5
-rw-r--r--drivers/iio/adc/ti_am335x_adc.c3
-rw-r--r--drivers/iio/adc/vf610_adc.c91
4 files changed, 66 insertions, 36 deletions
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 202daf889be2..46379b1fb25b 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -137,7 +137,8 @@ config AXP288_ADC
config CC10001_ADC
tristate "Cosmic Circuits 10001 ADC driver"
- depends on HAS_IOMEM || HAVE_CLK || REGULATOR
+ depends on HAVE_CLK || REGULATOR
+ depends on HAS_IOMEM
select IIO_BUFFER
select IIO_TRIGGERED_BUFFER
help
diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
index ff61ae55dd3f..8a0eb4a04fb5 100644
--- a/drivers/iio/adc/at91_adc.c
+++ b/drivers/iio/adc/at91_adc.c
@@ -544,7 +544,6 @@ static int at91_adc_configure_trigger(struct iio_trigger *trig, bool state)
{
struct iio_dev *idev = iio_trigger_get_drvdata(trig);
struct at91_adc_state *st = iio_priv(idev);
- struct iio_buffer *buffer = idev->buffer;
struct at91_adc_reg_desc *reg = st->registers;
u32 status = at91_adc_readl(st, reg->trigger_register);
int value;
@@ -564,7 +563,7 @@ static int at91_adc_configure_trigger(struct iio_trigger *trig, bool state)
at91_adc_writel(st, reg->trigger_register,
status | value);
- for_each_set_bit(bit, buffer->scan_mask,
+ for_each_set_bit(bit, idev->active_scan_mask,
st->num_channels) {
struct iio_chan_spec const *chan = idev->channels + bit;
at91_adc_writel(st, AT91_ADC_CHER,
@@ -579,7 +578,7 @@ static int at91_adc_configure_trigger(struct iio_trigger *trig, bool state)
at91_adc_writel(st, reg->trigger_register,
status & ~value);
- for_each_set_bit(bit, buffer->scan_mask,
+ for_each_set_bit(bit, idev->active_scan_mask,
st->num_channels) {
struct iio_chan_spec const *chan = idev->channels + bit;
at91_adc_writel(st, AT91_ADC_CHDR,
diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index 2e5cc4409f78..a0e7161f040c 100644
--- a/drivers/iio/adc/ti_am335x_adc.c
+++ b/drivers/iio/adc/ti_am335x_adc.c
@@ -188,12 +188,11 @@ static int tiadc_buffer_preenable(struct iio_dev *indio_dev)
static int tiadc_buffer_postenable(struct iio_dev *indio_dev)
{
struct tiadc_device *adc_dev = iio_priv(indio_dev);
- struct iio_buffer *buffer = indio_dev->buffer;
unsigned int enb = 0;
u8 bit;
tiadc_step_config(indio_dev);
- for_each_set_bit(bit, buffer->scan_mask, adc_dev->channels)
+ for_each_set_bit(bit, indio_dev->active_scan_mask, adc_dev->channels)
enb |= (get_adc_step_bit(adc_dev, bit) << 1);
adc_dev->buffer_en_ch_steps = enb;
diff --git a/drivers/iio/adc/vf610_adc.c b/drivers/iio/adc/vf610_adc.c
index 8ec353c01d98..e63b8e76d4c3 100644
--- a/drivers/iio/adc/vf610_adc.c
+++ b/drivers/iio/adc/vf610_adc.c
@@ -141,9 +141,13 @@ struct vf610_adc {
struct regulator *vref;
struct vf610_adc_feature adc_feature;
+ u32 sample_freq_avail[5];
+
struct completion completion;
};
+static const u32 vf610_hw_avgs[] = { 1, 4, 8, 16, 32 };
+
#define VF610_ADC_CHAN(_idx, _chan_type) { \
.type = (_chan_type), \
.indexed = 1, \
@@ -180,35 +184,47 @@ static const struct iio_chan_spec vf610_adc_iio_channels[] = {
/* sentinel */
};
-/*
- * ADC sample frequency, unit is ADCK cycles.
- * ADC clk source is ipg clock, which is the same as bus clock.
- *
- * ADC conversion time = SFCAdder + AverageNum x (BCT + LSTAdder)
- * SFCAdder: fixed to 6 ADCK cycles
- * AverageNum: 1, 4, 8, 16, 32 samples for hardware average.
- * BCT (Base Conversion Time): fixed to 25 ADCK cycles for 12 bit mode
- * LSTAdder(Long Sample Time): fixed to 3 ADCK cycles
- *
- * By default, enable 12 bit resolution mode, clock source
- * set to ipg clock, So get below frequency group:
- */
-static const u32 vf610_sample_freq_avail[5] =
-{1941176, 559332, 286957, 145374, 73171};
+static inline void vf610_adc_calculate_rates(struct vf610_adc *info)
+{
+ unsigned long adck_rate, ipg_rate = clk_get_rate(info->clk);
+ int i;
+
+ /*
+ * Calculate ADC sample frequencies
+ * Sample time unit is ADCK cycles. ADCK clk source is ipg clock,
+ * which is the same as bus clock.
+ *
+ * ADC conversion time = SFCAdder + AverageNum x (BCT + LSTAdder)
+ * SFCAdder: fixed to 6 ADCK cycles
+ * AverageNum: 1, 4, 8, 16, 32 samples for hardware average.
+ * BCT (Base Conversion Time): fixed to 25 ADCK cycles for 12 bit mode
+ * LSTAdder(Long Sample Time): fixed to 3 ADCK cycles
+ */
+ adck_rate = ipg_rate / info->adc_feature.clk_div;
+ for (i = 0; i < ARRAY_SIZE(vf610_hw_avgs); i++)
+ info->sample_freq_avail[i] =
+ adck_rate / (6 + vf610_hw_avgs[i] * (25 + 3));
+}
static inline void vf610_adc_cfg_init(struct vf610_adc *info)
{
+ struct vf610_adc_feature *adc_feature = &info->adc_feature;
+
/* set default Configuration for ADC controller */
- info->adc_feature.clk_sel = VF610_ADCIOC_BUSCLK_SET;
- info->adc_feature.vol_ref = VF610_ADCIOC_VR_VREF_SET;
+ adc_feature->clk_sel = VF610_ADCIOC_BUSCLK_SET;
+ adc_feature->vol_ref = VF610_ADCIOC_VR_VREF_SET;
+
+ adc_feature->calibration = true;
+ adc_feature->ovwren = true;
+
+ adc_feature->res_mode = 12;
+ adc_feature->sample_rate = 1;
+ adc_feature->lpm = true;
- info->adc_feature.calibration = true;
- info->adc_feature.ovwren = true;
+ /* Use a save ADCK which is below 20MHz on all devices */
+ adc_feature->clk_div = 8;
- info->adc_feature.clk_div = 1;
- info->adc_feature.res_mode = 12;
- info->adc_feature.sample_rate = 1;
- info->adc_feature.lpm = true;
+ vf610_adc_calculate_rates(info);
}
static void vf610_adc_cfg_post_set(struct vf610_adc *info)
@@ -290,12 +306,10 @@ static void vf610_adc_cfg_set(struct vf610_adc *info)
cfg_data = readl(info->regs + VF610_REG_ADC_CFG);
- /* low power configuration */
cfg_data &= ~VF610_ADC_ADLPC_EN;
if (adc_feature->lpm)
cfg_data |= VF610_ADC_ADLPC_EN;
- /* disable high speed */
cfg_data &= ~VF610_ADC_ADHSC_EN;
writel(cfg_data, info->regs + VF610_REG_ADC_CFG);
@@ -435,10 +449,27 @@ static irqreturn_t vf610_adc_isr(int irq, void *dev_id)
return IRQ_HANDLED;
}
-static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("1941176, 559332, 286957, 145374, 73171");
+static ssize_t vf610_show_samp_freq_avail(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct vf610_adc *info = iio_priv(dev_to_iio_dev(dev));
+ size_t len = 0;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(info->sample_freq_avail); i++)
+ len += scnprintf(buf + len, PAGE_SIZE - len,
+ "%u ", info->sample_freq_avail[i]);
+
+ /* replace trailing space by newline */
+ buf[len - 1] = '\n';
+
+ return len;
+}
+
+static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(vf610_show_samp_freq_avail);
static struct attribute *vf610_attributes[] = {
- &iio_const_attr_sampling_frequency_available.dev_attr.attr,
+ &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
NULL
};
@@ -502,7 +533,7 @@ static int vf610_read_raw(struct iio_dev *indio_dev,
return IIO_VAL_FRACTIONAL_LOG2;
case IIO_CHAN_INFO_SAMP_FREQ:
- *val = vf610_sample_freq_avail[info->adc_feature.sample_rate];
+ *val = info->sample_freq_avail[info->adc_feature.sample_rate];
*val2 = 0;
return IIO_VAL_INT;
@@ -525,9 +556,9 @@ static int vf610_write_raw(struct iio_dev *indio_dev,
switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
for (i = 0;
- i < ARRAY_SIZE(vf610_sample_freq_avail);
+ i < ARRAY_SIZE(info->sample_freq_avail);
i++)
- if (val == vf610_sample_freq_avail[i]) {
+ if (val == info->sample_freq_avail[i]) {
info->adc_feature.sample_rate = i;
vf610_adc_sample_set(info);
return 0;
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-28 16:34:48 +0000