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iio: adc: stm32: Enable use of stm32 timer triggers 

STM32 ADC has external timer trigger sources. Use stm32 timer triggers
API (e.g. is_stm32_timer_trigger()) with local ADC lookup table to
validate a trigger can be used.
This also provides correct trigger selection value (e.g. extsel).

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Fabrice Gasnier 2017-01-26 15:28:30 +01:00 committed by Jonathan Cameron
parent da9b948514
commit f24a33b3e2
2 changed files with 67 additions and 0 deletions
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2
drivers/iio/adc/Kconfig
View File

@ -500,6 +500,8 @@ config STM32_ADC_CORE
depends on OF
depends on REGULATOR
select IIO_BUFFER
select MFD_STM32_TIMERS
select IIO_STM32_TIMER_TRIGGER
select IIO_TRIGGERED_BUFFER
help
Select this option to enable the core driver for STMicroelectronics

65
drivers/iio/adc/stm32-adc.c
View File

@ -23,6 +23,7 @@
#include <linux/delay.h>
#include <linux/iio/iio.h>
#include <linux/iio/buffer.h>
#include <linux/iio/timer/stm32-timer-trigger.h>
#include <linux/iio/trigger.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
@ -81,6 +82,36 @@ enum stm32_adc_exten {
STM32_EXTEN_HWTRIG_BOTH_EDGES,
};
/* extsel - trigger mux selection value */
enum stm32_adc_extsel {
STM32_EXT0,
STM32_EXT1,
STM32_EXT2,
STM32_EXT3,
STM32_EXT4,
STM32_EXT5,
STM32_EXT6,
STM32_EXT7,
STM32_EXT8,
STM32_EXT9,
STM32_EXT10,
STM32_EXT11,
STM32_EXT12,
STM32_EXT13,
STM32_EXT14,
STM32_EXT15,
};
/**
* struct stm32_adc_trig_info - ADC trigger info
* @name: name of the trigger, corresponding to its source
* @extsel: trigger selection
*/
struct stm32_adc_trig_info {
const char *name;
enum stm32_adc_extsel extsel;
};
/**
* stm32_adc_regs - stm32 ADC misc registers & bitfield desc
* @reg: register offset
@ -176,6 +207,26 @@ static const struct stm32_adc_regs stm32f4_sq[STM32_ADC_MAX_SQ + 1] = {
{ STM32F4_ADC_SQR1, GENMASK(19, 15), 15 },
};
/* STM32F4 external trigger sources for all instances */
static struct stm32_adc_trig_info stm32f4_adc_trigs[] = {
{ TIM1_CH1, STM32_EXT0 },
{ TIM1_CH2, STM32_EXT1 },
{ TIM1_CH3, STM32_EXT2 },
{ TIM2_CH2, STM32_EXT3 },
{ TIM2_CH3, STM32_EXT4 },
{ TIM2_CH4, STM32_EXT5 },
{ TIM2_TRGO, STM32_EXT6 },
{ TIM3_CH1, STM32_EXT7 },
{ TIM3_TRGO, STM32_EXT8 },
{ TIM4_CH4, STM32_EXT9 },
{ TIM5_CH1, STM32_EXT10 },
{ TIM5_CH2, STM32_EXT11 },
{ TIM5_CH3, STM32_EXT12 },
{ TIM8_CH1, STM32_EXT13 },
{ TIM8_TRGO, STM32_EXT14 },
{}, /* sentinel */
};
/**
* STM32 ADC registers access routines
* @adc: stm32 adc instance
@ -318,6 +369,20 @@ static int stm32_adc_conf_scan_seq(struct iio_dev *indio_dev,
*/
static int stm32_adc_get_trig_extsel(struct iio_trigger *trig)
{
int i;
/* lookup triggers registered by stm32 timer trigger driver */
for (i = 0; stm32f4_adc_trigs[i].name; i++) {
/**
* Checking both stm32 timer trigger type and trig name
* should be safe against arbitrary trigger names.
*/
if (is_stm32_timer_trigger(trig) &&
!strcmp(stm32f4_adc_trigs[i].name, trig->name)) {
return stm32f4_adc_trigs[i].extsel;
}
}
return -EINVAL;
}