On Tue, 17 Jul 2018 18:46:55 +0200
Tomas Novotny <tomas@xxxxxxxxxx> wrote:
> VCNL4200 is an integrated long distance (up to 1500mm) proximity and
> ambient light sensor.
>
> The support is very basic. There is no configuration of proximity and
> ambient light sensing yet. Only the reading of both measured values is
> done.
>
> The reading of ambient light and proximity values is blocking. If you
> request a new value too early, the driver waits for new value to be
> ready.
>
> Signed-off-by: Tomas Novotny <tomas@xxxxxxxxxx>
A comment inline, but nothing much needs changing.
Jonathan
> ---
> drivers/iio/light/Kconfig | 5 +-
> drivers/iio/light/vcnl4000.c | 114 ++++++++++++++++++++++++++++++++++++++++---
> 2 files changed, 109 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
> index 074e50657366..c0344a961f54 100644
> --- a/drivers/iio/light/Kconfig
> +++ b/drivers/iio/light/Kconfig
> @@ -430,11 +430,12 @@ config US5182D
> will be called us5182d.
>
> config VCNL4000
> - tristate "VCNL4000/4010/4020 combined ALS and proximity sensor"
> + tristate "VCNL4000/4010/4020/4200 combined ALS and proximity sensor"
> depends on I2C
> help
> Say Y here if you want to build a driver for the Vishay VCNL4000,
> - VCNL4010, VCNL4020 combined ambient light and proximity sensor.
> + VCNL4010, VCNL4020, VCNL4200 combined ambient light and proximity
> + sensor.
>
> To compile this driver as a module, choose M here: the
> module will be called vcnl4000.
> diff --git a/drivers/iio/light/vcnl4000.c b/drivers/iio/light/vcnl4000.c
> index 642a366c1479..5de0d500c310 100644
> --- a/drivers/iio/light/vcnl4000.c
> +++ b/drivers/iio/light/vcnl4000.c
> @@ -1,5 +1,5 @@
> /*
> - * vcnl4000.c - Support for Vishay VCNL4000/4010/4020 combined ambient
> + * vcnl4000.c - Support for Vishay VCNL4000/4010/4020/4200 combined ambient
> * light and proximity sensor
> *
> * Copyright 2012 Peter Meerwald <pmeerw@xxxxxxxxxx>
> @@ -8,13 +8,15 @@
> * the GNU General Public License. See the file COPYING in the main
> * directory of this archive for more details.
> *
> - * IIO driver for VCNL4000 (7-bit I2C slave address 0x13)
> + * IIO driver for:
> + * VCNL4000/10/20 (7-bit I2C slave address 0x13)
> + * 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)
> + * interrupts (VCNL4010/20, VCNL4200)
> */
>
> #include <linux/module.h>
> @@ -28,6 +30,7 @@
> #define VCNL4000_DRV_NAME "vcnl4000"
> #define VCNL4000_PROD_ID 0x01
> #define VCNL4010_PROD_ID 0x02 /* for VCNL4020, VCNL4010 */
> +#define VCNL4200_PROD_ID 0x58
>
> #define VCNL4000_COMMAND 0x80 /* Command register */
> #define VCNL4000_PROD_REV 0x81 /* Product ID and Revision ID */
> @@ -40,6 +43,12 @@
> #define VCNL4000_PS_MEAS_FREQ 0x89 /* Proximity test signal frequency */
> #define VCNL4000_PS_MOD_ADJ 0x8a /* Proximity modulator timing adjustment */
>
> +#define VCNL4200_AL_CONF 0x00 /* Ambient light configuration */
> +#define VCNL4200_PS_CONF1 0x03 /* Proximity configuration */
> +#define VCNL4200_PS_DATA 0x08 /* Proximity data */
> +#define VCNL4200_AL_DATA 0x09 /* Ambient light data */
> +#define VCNL4200_DEV_ID 0x0e /* Device ID, slave address 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? */
> @@ -49,6 +58,14 @@
> enum vcnl4000_device_ids {
> VCNL4000,
> VCNL4010,
> + VCNL4200,
> +};
> +
> +struct vcnl4200_channel {
> + u8 reg;
> + ktime_t last_measurement;
> + ktime_t sampling_rate;
> + struct mutex lock;
> };
>
> struct vcnl4000_data {
> @@ -57,7 +74,9 @@ struct vcnl4000_data {
> int rev;
> int al_scale;
> const struct vcnl4000_chip_spec *chip_spec;
> - struct mutex lock;
> + struct mutex vcnl4000_lock;
> + struct vcnl4200_channel vcnl4200_al;
> + struct vcnl4200_channel vcnl4200_ps;
> };
>
> struct vcnl4000_chip_spec {
> @@ -70,6 +89,7 @@ struct vcnl4000_chip_spec {
> static const struct i2c_device_id vcnl4000_id[] = {
> { "vcnl4000", VCNL4000 },
> { "vcnl4010", VCNL4010 },
> + { "vcnl4200", VCNL4200 },
> { }
> };
> MODULE_DEVICE_TABLE(i2c, vcnl4000_id);
> @@ -100,6 +120,42 @@ static int vcnl4000_init(struct vcnl4000_data *data)
>
> data->rev = ret & 0xf;
> data->al_scale = 250000;
> + mutex_init(&data->vcnl4000_lock);
> +
> + return 0;
> +};
> +
> +static int vcnl4200_init(struct vcnl4000_data *data)
> +{
> + int ret;
> +
> + ret = i2c_smbus_read_word_data(data->client, VCNL4200_DEV_ID);
> + if (ret < 0)
> + return ret;
> +
> + if ((ret & 0xff) != VCNL4200_PROD_ID)
> + return -ENODEV;
> +
> + data->rev = (ret >> 8) & 0xf;
> +
> + /* Set defaults and enable both channels */
> + ret = i2c_smbus_write_byte_data(data->client, VCNL4200_AL_CONF, 0x00);
> + if (ret < 0)
> + return ret;
> + ret = i2c_smbus_write_byte_data(data->client, VCNL4200_PS_CONF1, 0x00);
> + if (ret < 0)
> + return ret;
> +
> + 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);
I'm not particularly keen on the mixing of constant and non constant
stuff in these, but I guess there isn't enough constant stuff to bother
factoring that out.
> + data->vcnl4200_al.last_measurement = ktime_set(0, 0);
> + data->vcnl4200_ps.last_measurement = ktime_set(0, 0);
> + mutex_init(&data->vcnl4200_al.lock);
> + mutex_init(&data->vcnl4200_ps.lock);
>
> return 0;
> };
> @@ -111,7 +167,7 @@ static int vcnl4000_measure(struct vcnl4000_data *data, u8 req_mask,
> __be16 buf;
> int ret;
>
> - mutex_lock(&data->lock);
> + mutex_lock(&data->vcnl4000_lock);
>
> ret = i2c_smbus_write_byte_data(data->client, VCNL4000_COMMAND,
> req_mask);
> @@ -140,16 +196,43 @@ static int vcnl4000_measure(struct vcnl4000_data *data, u8 req_mask,
> if (ret < 0)
> goto fail;
>
> - mutex_unlock(&data->lock);
> + mutex_unlock(&data->vcnl4000_lock);
> *val = be16_to_cpu(buf);
>
> return 0;
>
> fail:
> - mutex_unlock(&data->lock);
> + mutex_unlock(&data->vcnl4000_lock);
> return ret;
> }
>
> +static int vcnl4200_measure(struct vcnl4000_data *data,
> + struct vcnl4200_channel *chan, int *val)
> +{
> + int ret;
> + s64 delta;
> + ktime_t next_measurement;
> +
> + mutex_lock(&chan->lock);
> +
> + next_measurement = ktime_add(chan->last_measurement,
> + chan->sampling_rate);
> + delta = ktime_us_delta(next_measurement, ktime_get());
> + if (delta > 0)
> + usleep_range(delta, delta + 500);
> + chan->last_measurement = ktime_get();
> +
> + mutex_unlock(&chan->lock);
> +
> + ret = i2c_smbus_read_word_data(data->client, chan->reg);
> + if (ret < 0)
> + return ret;
> +
> + *val = ret;
> +
> + return 0;
> +}
> +
> static int vcnl4000_measure_light(struct vcnl4000_data *data, int *val)
> {
> return vcnl4000_measure(data,
> @@ -157,6 +240,11 @@ static int vcnl4000_measure_light(struct vcnl4000_data *data, int *val)
> VCNL4000_AL_RESULT_HI, val);
> }
>
> +static int vcnl4200_measure_light(struct vcnl4000_data *data, int *val)
> +{
> + return vcnl4200_measure(data, &data->vcnl4200_al, val);
> +}
> +
> static int vcnl4000_measure_proximity(struct vcnl4000_data *data, int *val)
> {
> return vcnl4000_measure(data,
> @@ -164,6 +252,11 @@ static int vcnl4000_measure_proximity(struct vcnl4000_data *data, int *val)
> VCNL4000_PS_RESULT_HI, val);
> }
>
> +static int vcnl4200_measure_proximity(struct vcnl4000_data *data, int *val)
> +{
> + return vcnl4200_measure(data, &data->vcnl4200_ps, val);
> +}
> +
> static const struct vcnl4000_chip_spec vcnl4000_chip_spec_cfg[] = {
> [VCNL4000] = {
> .prod = "VCNL4000",
> @@ -177,6 +270,12 @@ static const struct vcnl4000_chip_spec vcnl4000_chip_spec_cfg[] = {
> .measure_light = vcnl4000_measure_light,
> .measure_proximity = vcnl4000_measure_proximity,
> },
> + [VCNL4200] = {
> + .prod = "VCNL4200",
> + .init = vcnl4200_init,
> + .measure_light = vcnl4200_measure_light,
> + .measure_proximity = vcnl4200_measure_proximity,
> + },
> };
>
> static const struct iio_chan_spec vcnl4000_channels[] = {
> @@ -245,7 +344,6 @@ static int vcnl4000_probe(struct i2c_client *client,
> data->client = client;
> data->id = id->driver_data;
> data->chip_spec = &vcnl4000_chip_spec_cfg[data->id];
> - mutex_init(&data->lock);
>
> ret = data->chip_spec->init(data);
> if (ret < 0)
--
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