linux-kernel - Re: [PATCH 12/12] staging: iio: tsl2x7x: make proximity sensor function correctly

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Message-ID: <20180310145630.73007f89@archlinux>
Date:   Sat, 10 Mar 2018 14:56:30 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Brian Masney <masneyb@...tation.org>
Cc:     linux-iio@...r.kernel.org, gregkh@...uxfoundation.org,
        devel@...verdev.osuosl.org, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net, linux-kernel@...r.kernel.org,
        Jon.Brenner@....com
Subject: Re: [PATCH 12/12] staging: iio: tsl2x7x: make proximity sensor
 function correctly

On Sat,  3 Mar 2018 20:49:42 -0500
Brian Masney <masneyb@...tation.org> wrote:

> The bits for setting up the proximity diode were not setup correctly and
> this was causing the proximity sensor to not function correctly. This
> patch sets up the correct bit mask in tsl2x7x_chip_on() based on what
> the data sheet expects. From page 35 of the TSL2771 data sheet:
> https://ams.com/eng/content/download/250264/976045/file/TSL2771_DS000105_3-00.pdf
> 
> - Bits 0-1 is the ALS gain control
> - Bits 2-3 is reserved (The proximity gain control on other tsl2x7x chips)
> - Bits 4-5 is the proximity diode select
> - Bits 6-7 is the LED drive strength
> 
> tsl2x7x_chip_on() had the power and diode hardcoded, so these are
> extracted out into the settings so that these fields can be configured
> in the platform data.
> 
> The default prox_gain is changed from 1 (2X gain) to 0 (1X gain) since
> the proximity gain control on the TSL2771, TMD2771, and other chips have
> these fields listed as reserved, and to write 0 into those bits.
> 
> Verified that the proximity sensor now works correctly on a TSL2771
> hooked up to a Raspberry Pi 2.
> 
> Signed-off-by: Brian Masney <masneyb@...tation.org>
Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.

So just patch 10 that needs a v2.

Thanks for the set - nearly there ;)

Jonathan

> ---
>  drivers/staging/iio/light/tsl2x7x.c | 25 ++++++++++++++-----------
>  drivers/staging/iio/light/tsl2x7x.h |  2 ++
>  2 files changed, 16 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/staging/iio/light/tsl2x7x.c b/drivers/staging/iio/light/tsl2x7x.c
> index 8c29a52153c1..ab518cdec43e 100644
> --- a/drivers/staging/iio/light/tsl2x7x.c
> +++ b/drivers/staging/iio/light/tsl2x7x.c
> @@ -109,15 +109,15 @@
>  #define TSL2X7X_CNTL_INTPROXPON_ENBL	0x2F
>  
>  /*Prox diode to use */
> -#define TSL2X7X_DIODE0			0x10
> -#define TSL2X7X_DIODE1			0x20
> -#define TSL2X7X_DIODE_BOTH		0x30
> +#define TSL2X7X_DIODE0			0x01
> +#define TSL2X7X_DIODE1			0x02
> +#define TSL2X7X_DIODE_BOTH		0x03
>  
>  /* LED Power */
>  #define TSL2X7X_100_mA			0x00
> -#define TSL2X7X_50_mA			0x40
> -#define TSL2X7X_25_mA			0x80
> -#define TSL2X7X_13_mA			0xD0
> +#define TSL2X7X_50_mA			0x01
> +#define TSL2X7X_25_mA			0x02
> +#define TSL2X7X_13_mA			0x03
>  #define TSL2X7X_MAX_TIMER_CNT		0xFF
>  
>  #define TSL2X7X_MIN_ITIME		3
> @@ -228,7 +228,7 @@ static const struct tsl2x7x_settings tsl2x7x_default_settings = {
>  	.als_time = 219, /* 101 ms */
>  	.als_gain = 0,
>  	.prx_time = 254, /* 5.4 ms */
> -	.prox_gain = 1,
> +	.prox_gain = 0,
>  	.wait_time = 245,
>  	.prox_config = 0,
>  	.als_gain_trim = 1000,
> @@ -240,7 +240,9 @@ static const struct tsl2x7x_settings tsl2x7x_default_settings = {
>  	.prox_thres_low  = 0,
>  	.prox_thres_high = 512,
>  	.prox_max_samples_cal = 30,
> -	.prox_pulse_count = 8
> +	.prox_pulse_count = 8,
> +	.prox_diode = TSL2X7X_DIODE1,
> +	.prox_power = TSL2X7X_100_mA
>  };
>  
>  static const s16 tsl2x7x_als_gain[] = {
> @@ -664,9 +666,10 @@ static int tsl2x7x_chip_on(struct iio_dev *indio_dev)
>  
>  	/* Set the gain based on tsl2x7x_settings struct */
>  	chip->tsl2x7x_config[TSL2X7X_GAIN] =
> -		chip->settings.als_gain |
> -			(TSL2X7X_100_mA | TSL2X7X_DIODE1) |
> -			(chip->settings.prox_gain << 2);
> +		(chip->settings.als_gain & 0xFF) |
> +		((chip->settings.prox_gain & 0xFF) << 2) |
> +		(chip->settings.prox_diode << 4) |
> +		(chip->settings.prox_power << 6);
>  
>  	/* set chip struct re scaling and saturation */
>  	chip->als_saturation = als_count * 922; /* 90% of full scale */
> diff --git a/drivers/staging/iio/light/tsl2x7x.h b/drivers/staging/iio/light/tsl2x7x.h
> index 6624cbca7a83..28b0e7fdc9b8 100644
> --- a/drivers/staging/iio/light/tsl2x7x.h
> +++ b/drivers/staging/iio/light/tsl2x7x.h
> @@ -78,6 +78,8 @@ struct tsl2x7x_settings {
>  	int prox_thres_high;
>  	int prox_pulse_count;
>  	int prox_max_samples_cal;
> +	int prox_diode;
> +	int prox_power;
>  };
>  
>  /**