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Commit f24a33b3 authored by Fabrice Gasnier's avatar Fabrice Gasnier Committed by Jonathan Cameron
Browse files

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: default avatarFabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent da9b9485

drivers/iio/adc/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -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

drivers/iio/adc/stm32-adc.c

+65 −0
Original line number Diff line number Diff line
@@ -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;

}