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author | Fabrice Gasnier <fabrice.gasnier@st.com> | 2017-01-26 15:28:30 +0100 |
---|---|---|
committer | Jonathan Cameron <jic23@kernel.org> | 2017-01-28 18:24:12 +0000 |
commit | f24a33b3e2a393856c315b23bbb5bebf422b0611 (patch) | |
tree | ed334b480eeb0951e148b03ae2f25a0454c76f3c | |
parent | da9b948514c36da480cc15f7c75f51417f882175 (diff) | |
download | linux-stable-f24a33b3e2a393856c315b23bbb5bebf422b0611.tar.gz linux-stable-f24a33b3e2a393856c315b23bbb5bebf422b0611.tar.bz2 linux-stable-f24a33b3e2a393856c315b23bbb5bebf422b0611.zip |
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>
-rw-r--r-- | drivers/iio/adc/Kconfig | 2 | ||||
-rw-r--r-- | drivers/iio/adc/stm32-adc.c | 65 |
2 files changed, 67 insertions, 0 deletions
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 69e6cc4b40bf..210fa116842b 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -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 diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c index 1e382b6c1424..87d984ba4ef2 100644 --- a/drivers/iio/adc/stm32-adc.c +++ b/drivers/iio/adc/stm32-adc.c @@ -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; } |