linux-kernel - Re: [PATCH v3 4/5] iio: light: vcnl4000 add support for the VCNL4040 proximity and light sensor

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Date:   Sun, 24 Mar 2019 17:24:59 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     "Angus Ainslie (Purism)" <angus@...ea.ca>
Cc:     Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Tomas Novotny <tomas@...otny.cz>, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/5] iio: light: vcnl4000 add support for the
 VCNL4040 proximity and light sensor

On Thu, 21 Mar 2019 08:40:46 -0700
"Angus Ainslie (Purism)" <angus@...ea.ca> wrote:

> The VCNL4040 is almost identical to the VCNL4200 as far as register
> layout goes but just need to check a different ID register location.
> 
> Signed-off-by: Angus Ainslie (Purism) <angus@...ea.ca>
Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.

Thanks,

Jonathan

> ---
>  drivers/iio/light/vcnl4000.c | 51 ++++++++++++++++++++++++++++++------
>  1 file changed, 43 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/iio/light/vcnl4000.c b/drivers/iio/light/vcnl4000.c
> index 308cb2d2b641..12c52f2b853a 100644
> --- a/drivers/iio/light/vcnl4000.c
> +++ b/drivers/iio/light/vcnl4000.c
> @@ -1,8 +1,9 @@
>  /*
> - * vcnl4000.c - Support for Vishay VCNL4000/4010/4020/4200 combined ambient
> + * vcnl4000.c - Support for Vishay VCNL4000/4010/4020/4040/4200 combined ambient
>   * light and proximity sensor
>   *
>   * Copyright 2012 Peter Meerwald <pmeerw@...erw.net>
> + * Copyright 2019 Pursim SPC
>   *
>   * This file is subject to the terms and conditions of version 2 of
>   * the GNU General Public License.  See the file COPYING in the main
> @@ -10,13 +11,14 @@
>   *
>   * IIO driver for:
>   *   VCNL4000/10/20 (7-bit I2C slave address 0x13)
> + *   VCNL4040 (7-bit I2C slave address 0x60)
>   *   VCNL4200 (7-bit I2C slave address 0x51)
>   *
>   * TODO:
>   *   allow to adjust IR current
>   *   proximity threshold and event handling
>   *   periodic ALS/proximity measurement (VCNL4010/20)
> - *   interrupts (VCNL4010/20, VCNL4200)
> + *   interrupts (VCNL4010/20/40, VCNL4200)
>   */
>  
>  #include <linux/module.h>
> @@ -30,6 +32,7 @@
>  #define VCNL4000_DRV_NAME "vcnl4000"
>  #define VCNL4000_PROD_ID	0x01
>  #define VCNL4010_PROD_ID	0x02 /* for VCNL4020, VCNL4010 */
> +#define VCNL4040_PROD_ID	0x86
>  #define VCNL4200_PROD_ID	0x58
>  
>  #define VCNL4000_COMMAND	0x80 /* Command register */
> @@ -49,6 +52,8 @@
>  #define VCNL4200_AL_DATA	0x09 /* Ambient light data */
>  #define VCNL4200_DEV_ID		0x0e /* Device ID, slave address and version */
>  
> +#define VCNL4040_DEV_ID		0x0c /* Device ID and version */
> +
>  /* Bit masks for COMMAND register */
>  #define VCNL4000_AL_RDY		BIT(6) /* ALS data ready? */
>  #define VCNL4000_PS_RDY		BIT(5) /* proximity data ready? */
> @@ -58,6 +63,7 @@
>  enum vcnl4000_device_ids {
>  	VCNL4000,
>  	VCNL4010,
> +	VCNL4040,
>  	VCNL4200,
>  };
>  
> @@ -90,6 +96,7 @@ static const struct i2c_device_id vcnl4000_id[] = {
>  	{ "vcnl4000", VCNL4000 },
>  	{ "vcnl4010", VCNL4010 },
>  	{ "vcnl4020", VCNL4010 },
> +	{ "vcnl4040", VCNL4040 },
>  	{ "vcnl4200", VCNL4200 },
>  	{ }
>  };
> @@ -128,14 +135,26 @@ static int vcnl4000_init(struct vcnl4000_data *data)
>  
>  static int vcnl4200_init(struct vcnl4000_data *data)
>  {
> -	int ret;
> +	int ret, id;
>  
>  	ret = i2c_smbus_read_word_data(data->client, VCNL4200_DEV_ID);
>  	if (ret < 0)
>  		return ret;
>  
> -	if ((ret & 0xff) != VCNL4200_PROD_ID)
> -		return -ENODEV;
> +	id = ret & 0xff;
> +
> +	if (id != VCNL4200_PROD_ID) {
> +		ret = i2c_smbus_read_word_data(data->client, VCNL4040_DEV_ID);
> +		if (ret < 0)
> +			return ret;
> +
> +		id = ret & 0xff;
> +
> +		if (id != VCNL4040_PROD_ID)
> +			return -ENODEV;
> +	}
> +
> +	dev_dbg(&data->client->dev, "device id 0x%x", id);
>  
>  	data->rev = (ret >> 8) & 0xf;
>  
> @@ -150,9 +169,19 @@ static int vcnl4200_init(struct vcnl4000_data *data)
>  	data->al_scale = 24000;
>  	data->vcnl4200_al.reg = VCNL4200_AL_DATA;
>  	data->vcnl4200_ps.reg = VCNL4200_PS_DATA;
> -	/* Integration time is 50ms, but the experiments show 54ms in total. */
> -	data->vcnl4200_al.sampling_rate = ktime_set(0, 54000 * 1000);
> -	data->vcnl4200_ps.sampling_rate = ktime_set(0, 4200 * 1000);
> +	switch (id) {
> +	case VCNL4200_PROD_ID:
> +		/* Integration time is 50ms, but the experiments */
> +		/* show 54ms in total. */
> +		data->vcnl4200_al.sampling_rate = ktime_set(0, 54000 * 1000);
> +		data->vcnl4200_ps.sampling_rate = ktime_set(0, 4200 * 1000);
> +		break;
> +	case VCNL4040_PROD_ID:
> +		/* Integration time is 80ms, add 10ms. */
> +		data->vcnl4200_al.sampling_rate = ktime_set(0, 100000 * 1000);
> +		data->vcnl4200_ps.sampling_rate = ktime_set(0, 100000 * 1000);
> +		break;
> +	}
>  	data->vcnl4200_al.last_measurement = ktime_set(0, 0);
>  	data->vcnl4200_ps.last_measurement = ktime_set(0, 0);
>  	mutex_init(&data->vcnl4200_al.lock);
> @@ -271,6 +300,12 @@ static const struct vcnl4000_chip_spec vcnl4000_chip_spec_cfg[] = {
>  		.measure_light = vcnl4000_measure_light,
>  		.measure_proximity = vcnl4000_measure_proximity,
>  	},
> +	[VCNL4040] = {
> +		.prod = "VCNL4040",
> +		.init = vcnl4200_init,
> +		.measure_light = vcnl4200_measure_light,
> +		.measure_proximity = vcnl4200_measure_proximity,
> +	},
>  	[VCNL4200] = {
>  		.prod = "VCNL4200",
>  		.init = vcnl4200_init,