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Subject[PATCH 05/10] iio: adc: stm32: add trigger polarity ext attr
Date
Add trigger polarity extended attribute.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
---
drivers/iio/adc/stm32/stm32-adc.c | 41 ++++++++++++++++++++++++++++++++++++-
drivers/iio/adc/stm32/stm32-adc.h | 4 ++++
drivers/iio/adc/stm32/stm32f4-adc.c | 12 +++++++++++
3 files changed, 56 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/stm32/stm32-adc.c b/drivers/iio/adc/stm32/stm32-adc.c
index 1a13450..9b4b459 100644
--- a/drivers/iio/adc/stm32/stm32-adc.c
+++ b/drivers/iio/adc/stm32/stm32-adc.c
@@ -207,7 +207,11 @@ static int stm32_adc_set_trig(struct iio_dev *indio_dev,

/* trigger source */
extsel = trig_info[ret].extsel;
- exten = STM32_EXTEN_HWTRIG_RISING_EDGE;
+
+ /* default to rising edge if no polarity */
+ if (adc->exten == STM32_EXTEN_SWTRIG)
+ adc->exten = STM32_EXTEN_HWTRIG_RISING_EDGE;
+ exten = adc->exten;
}

spin_lock_irqsave(&adc->lock, flags);
@@ -221,6 +225,40 @@ static int stm32_adc_set_trig(struct iio_dev *indio_dev,
return 0;
}

+static int stm32_adc_set_trig_pol(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ unsigned int type)
+{
+ struct stm32_adc *adc = iio_priv(indio_dev);
+
+ adc->exten = type;
+
+ return 0;
+}
+
+static int stm32_adc_get_trig_pol(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan)
+{
+ struct stm32_adc *adc = iio_priv(indio_dev);
+
+ return adc->exten;
+}
+
+static const char * const stm32_trig_pol_items[] = {
+ [STM32_EXTEN_SWTRIG] = "swtrig",
+ [STM32_EXTEN_HWTRIG_RISING_EDGE] = "rising-edge",
+ [STM32_EXTEN_HWTRIG_FALLING_EDGE] = "falling-edge",
+ [STM32_EXTEN_HWTRIG_BOTH_EDGES] = "both-edges",
+};
+
+const struct iio_enum stm32_adc_trig_pol = {
+ .items = stm32_trig_pol_items,
+ .num_items = ARRAY_SIZE(stm32_trig_pol_items),
+ .get = stm32_adc_get_trig_pol,
+ .set = stm32_adc_set_trig_pol,
+};
+EXPORT_SYMBOL_GPL(stm32_adc_trig_pol);
+
/**
* stm32_adc_conv_irq_enable() - Unmask end of conversion irq
* @adc: stm32 adc instance
@@ -893,6 +931,7 @@ static void stm32_adc_chan_init_one(struct iio_dev *indio_dev,
chan->scan_type.realbits = adc->common->data->highres;
chan->scan_type.storagebits = STM32_STORAGEBITS;
chan->scan_type.shift = 0;
+ chan->ext_info = adc->common->data->ext_info;
}

static int stm32_adc_chan_of_init(struct iio_dev *indio_dev,
diff --git a/drivers/iio/adc/stm32/stm32-adc.h b/drivers/iio/adc/stm32/stm32-adc.h
index fe3568b..6c9b70d 100644
--- a/drivers/iio/adc/stm32/stm32-adc.h
+++ b/drivers/iio/adc/stm32/stm32-adc.h
@@ -234,6 +234,7 @@ struct stm32_adc_reginfo {
* @ext_triggers: Reference to trigger info for regular channels
* @jext_triggers: Reference to trigger info for injected channels
* @adc_reginfo: stm32 ADC registers description
+ * @ext_info: Extended channel info
* @highres: Max resolution
* @max_clock_rate: Max input clock rate
* @clk_sel: routine to select common clock and prescaler
@@ -251,6 +252,7 @@ struct stm32_adc_ops {
const struct stm32_adc_trig_info *ext_triggers;
const struct stm32_adc_trig_info *jext_triggers;
const struct stm32_adc_reginfo *adc_reginfo;
+ const struct iio_chan_spec_ext_info *ext_info;
int highres;
unsigned long max_clock_rate;
int (*clk_sel)(struct stm32_adc *adc);
@@ -273,6 +275,7 @@ struct stm32_adc_ops {
* @id: ADC instance number (e.g. adc 1, 2 or 3)
* @offset: ADC instance register offset in ADC block
* @max_channels: Max channels number for this ADC.
+ * @exten: External trigger config (enable/polarity)
* @extrig_list: External trigger list (for regular channel)
* @completion: end of single conversion completion
* @buffer: data buffer
@@ -295,6 +298,7 @@ struct stm32_adc {
int id;
int offset;
int max_channels;
+ enum stm32_adc_exten exten;
struct list_head extrig_list;
struct completion completion;
u16 *buffer;
diff --git a/drivers/iio/adc/stm32/stm32f4-adc.c b/drivers/iio/adc/stm32/stm32f4-adc.c
index 4d7a2a8..e033a68 100644
--- a/drivers/iio/adc/stm32/stm32f4-adc.c
+++ b/drivers/iio/adc/stm32/stm32f4-adc.c
@@ -555,11 +555,23 @@ static int stm32f4_adc_clk_sel(struct stm32_adc *adc)
return 0;
}

+static const struct iio_chan_spec_ext_info stm32f4_adc_ext_info[] = {
+ IIO_ENUM("trigger_pol", IIO_SHARED_BY_ALL, &stm32_adc_trig_pol),
+ {
+ .name = "trigger_pol_available",
+ .shared = IIO_SHARED_BY_ALL,
+ .read = iio_enum_available_read,
+ .private = (uintptr_t)&stm32_adc_trig_pol,
+ },
+ {},
+};
+
static const struct stm32_adc_ops stm32f4_adc_ops = {
.adc_info = stm32f4_adc_info,
.ext_triggers = stm32f4_adc_ext_triggers,
.jext_triggers = stm32f4_adc_jext_triggers,
.adc_reginfo = &stm32f4_adc_reginfo,
+ .ext_info = stm32f4_adc_ext_info,
.highres = 12,
.max_clock_rate = 36000000,
.clk_sel = stm32f4_adc_clk_sel,
--
1.9.1
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