On Sun, 25 Aug 2013, Zubair Lutfullah wrote:
> Previously the driver had only one-shot reading functionality.
> This patch adds triggered buffer support to the driver.
>
> Continuous sampling starts when buffer is enabled.
> And samples are pushed to userpace by the trigger which
> triggers automatically at every hardware interrupt
> of FIFO1 filling with samples upto threshold value.
>
> Userspace responsibility to stop sampling by writing zero
> in the buffer enable file.
>
> Patil Rachna (TI) laid the ground work for ADC HW register access.
> Russ Dill (TI) fixed bugs in the driver relevant to FIFOs and IRQs.
>
> I fixed channel scanning so multiple ADC channels can be read
> simultaneously and pushed to userspace.
> Restructured the driver to fit IIO ABI.
> And added trigger support.
>
> Signed-off-by: Zubair Lutfullah <zubair.lutfullah@xxxxxxxxx>
> Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Russ Dill <Russ.Dill@xxxxxx>
> ---
> drivers/iio/adc/ti_am335x_adc.c | 254 +++++++++++++++++++++++++++++++---
> include/linux/mfd/ti_am335x_tscadc.h | 13 ++
> 2 files changed, 246 insertions(+), 21 deletions(-)
MFD stuff looks okay to me.
Acked-by: Lee Jones <lee.jones@xxxxxxxxxx>
<snip>
> diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h
> index db1791b..a372ebf 100644
> --- a/include/linux/mfd/ti_am335x_tscadc.h
> +++ b/include/linux/mfd/ti_am335x_tscadc.h
> @@ -46,17 +46,25 @@
> /* Step Enable */
> #define STEPENB_MASK (0x1FFFF << 0)
> #define STEPENB(val) ((val) << 0)
> +#define ENB(val) (1 << (val))
> +#define STPENB_STEPENB STEPENB(0x1FFFF)
> +#define STPENB_STEPENB_TC STEPENB(0x1FFF)
>
> /* IRQ enable */
> #define IRQENB_HW_PEN BIT(0)
> #define IRQENB_FIFO0THRES BIT(2)
> +#define IRQENB_FIFO0OVRRUN BIT(3)
> +#define IRQENB_FIFO0UNDRFLW BIT(4)
> #define IRQENB_FIFO1THRES BIT(5)
> +#define IRQENB_FIFO1OVRRUN BIT(6)
> +#define IRQENB_FIFO1UNDRFLW BIT(7)
> #define IRQENB_PENUP BIT(9)
>
> /* Step Configuration */
> #define STEPCONFIG_MODE_MASK (3 << 0)
> #define STEPCONFIG_MODE(val) ((val) << 0)
> #define STEPCONFIG_MODE_HWSYNC STEPCONFIG_MODE(2)
> +#define STEPCONFIG_MODE_SWCNT STEPCONFIG_MODE(1)
> #define STEPCONFIG_AVG_MASK (7 << 2)
> #define STEPCONFIG_AVG(val) ((val) << 2)
> #define STEPCONFIG_AVG_16 STEPCONFIG_AVG(4)
> @@ -124,6 +132,7 @@
> #define MAX_CLK_DIV 7
> #define TOTAL_STEPS 16
> #define TOTAL_CHANNELS 8
> +#define FIFO1_THRESHOLD 19
>
> /*
> * ADC runs at 3MHz, and it takes
> @@ -153,6 +162,10 @@ struct ti_tscadc_dev {
>
> /* adc device */
> struct adc_device *adc;
> +
> + /* Context save */
> + unsigned int irqstat;
> + unsigned int ctrl;
> };
>
> static inline struct ti_tscadc_dev *ti_tscadc_dev_get(struct platform_device *p)
--
Lee Jones
Linaro ST-Ericsson Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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