On Fri, 2 Aug 2019 12:42:28 +0100 Martyn Welch <martyn.we...@collabora.com> wrote:
> This driver adds the initial support for the ON Semiconductor > NOA1305 Ambient Light Sensor. > > Originally written by Sergei Miroshnichenko. Found here: > > https://github.com/EmcraftSystems/linux-upstream/commit/196d6cf897e632d2cb82d45484bd7a1bfdd5b6d9 > > Signed-off-by: Sergei M <fiz...@yandex.com> > Signed-off-by: Martyn Welch <martyn.we...@collabora.com> One minor thing I'll fix up whilst applying. Applied to the togreg branch of iio.git and pushed out as testing to see if we missed anything! Thanks, Jonathan > --- > > Changes: > v2: > - Correcting authorship and SOB. > v3: > - Improve register define naming. > - Follow IIO convention of interleaving register bit definitions with > register defintions. > - Use proper endian swapping. > - Process raw sensor count into Lux. > - Avoid setting variables to zero when not needed. > - Check return value of i2c writes. > - Implement disabling of regulator as a devm action. > - Remove excessive white spacing. > v4: > - Clean up returns > - Remove redundant noa1305_remove() > - Remove redundant interrupt configuration/disabling > - Return raw value and scaling > > Note: Scaling added for all possible interation times to ensure the > mechanism utilised would allow this, though chip currently > statically configured to 800mS. > > drivers/iio/light/Kconfig | 10 ++ > drivers/iio/light/Makefile | 1 + > drivers/iio/light/noa1305.c | 312 ++++++++++++++++++++++++++++++++++++ > 3 files changed, 323 insertions(+) > create mode 100644 drivers/iio/light/noa1305.c > > diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig > index 954c958cfc43..d1db0ec0d0f5 100644 > --- a/drivers/iio/light/Kconfig > +++ b/drivers/iio/light/Kconfig > @@ -309,6 +309,16 @@ config MAX44009 > To compile this driver as a module, choose M here: > the module will be called max44009. > > +config NOA1305 > + tristate "ON Semiconductor NOA1305 ambient light sensor" > + depends on I2C Needs to select REGMAP_I2C I think. I'll add that if it's all I find. > + help > + Say Y here if you want to build support for the ON Semiconductor > + NOA1305 ambient light sensor. > + > + To compile this driver as a module, choose M here: > + The module will be called noa1305. > + > config OPT3001 > tristate "Texas Instruments OPT3001 Light Sensor" > depends on I2C > diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile > index e40794fbb435..00d1f9b98f39 100644 > --- a/drivers/iio/light/Makefile > +++ b/drivers/iio/light/Makefile > @@ -29,6 +29,7 @@ obj-$(CONFIG_LTR501) += ltr501.o > obj-$(CONFIG_LV0104CS) += lv0104cs.o > obj-$(CONFIG_MAX44000) += max44000.o > obj-$(CONFIG_MAX44009) += max44009.o > +obj-$(CONFIG_NOA1305) += noa1305.o > obj-$(CONFIG_OPT3001) += opt3001.o > obj-$(CONFIG_PA12203001) += pa12203001.o > obj-$(CONFIG_RPR0521) += rpr0521.o > diff --git a/drivers/iio/light/noa1305.c b/drivers/iio/light/noa1305.c > new file mode 100644 > index 000000000000..b8758aa7b32a > --- /dev/null > +++ b/drivers/iio/light/noa1305.c > @@ -0,0 +1,312 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * Support for ON Semiconductor NOA1305 ambient light sensor > + * > + * Copyright (C) 2016 Emcraft Systems > + * Copyright (C) 2019 Collabora Ltd. > + */ > + > +#include <linux/delay.h> > +#include <linux/err.h> > +#include <linux/i2c.h> > +#include <linux/iio/iio.h> > +#include <linux/iio/sysfs.h> > +#include <linux/module.h> > +#include <linux/regmap.h> > +#include <linux/regulator/consumer.h> > + > +#define NOA1305_REG_POWER_CONTROL 0x0 > +#define NOA1305_POWER_CONTROL_DOWN 0x00 > +#define NOA1305_POWER_CONTROL_ON 0x08 > +#define NOA1305_REG_RESET 0x1 > +#define NOA1305_RESET_RESET 0x10 > +#define NOA1305_REG_INTEGRATION_TIME 0x2 > +#define NOA1305_INTEGR_TIME_800MS 0x00 > +#define NOA1305_INTEGR_TIME_400MS 0x01 > +#define NOA1305_INTEGR_TIME_200MS 0x02 > +#define NOA1305_INTEGR_TIME_100MS 0x03 > +#define NOA1305_INTEGR_TIME_50MS 0x04 > +#define NOA1305_INTEGR_TIME_25MS 0x05 > +#define NOA1305_INTEGR_TIME_12_5MS 0x06 > +#define NOA1305_INTEGR_TIME_6_25MS 0x07 > +#define NOA1305_REG_INT_SELECT 0x3 > +#define NOA1305_INT_SEL_ACTIVE_HIGH 0x01 > +#define NOA1305_INT_SEL_ACTIVE_LOW 0x02 > +#define NOA1305_INT_SEL_INACTIVE 0x03 > +#define NOA1305_REG_INT_THRESH_LSB 0x4 > +#define NOA1305_REG_INT_THRESH_MSB 0x5 > +#define NOA1305_REG_ALS_DATA_LSB 0x6 > +#define NOA1305_REG_ALS_DATA_MSB 0x7 > +#define NOA1305_REG_DEVICE_ID_LSB 0x8 > +#define NOA1305_REG_DEVICE_ID_MSB 0x9 > + > +#define NOA1305_DEVICE_ID 0x0519 > +#define NOA1305_DRIVER_NAME "noa1305" > + > +struct noa1305_priv { > + struct i2c_client *client; > + struct regmap *regmap; > + struct regulator *vin_reg; > +}; > + > +static int noa1305_measure(struct noa1305_priv *priv) > +{ > + __le16 data; > + int ret; > + > + ret = regmap_bulk_read(priv->regmap, NOA1305_REG_ALS_DATA_LSB, &data, > + 2); > + if (ret < 0) > + return ret; > + > + return le16_to_cpu(data); > +} > + > +static int noa1305_scale(struct noa1305_priv *priv, int *val, int *val2) > +{ > + int data; > + int ret; > + > + ret = regmap_read(priv->regmap, NOA1305_REG_INTEGRATION_TIME, &data); > + if (ret < 0) > + return ret; > + > + /* > + * Lux = count / (<Integration Constant> * <Integration Time>) > + * > + * Integration Constant = 7.7 > + * Integration Time in Seconds > + */ > + switch (data) { > + case NOA1305_INTEGR_TIME_800MS: > + *val = 100; > + *val2 = 77 * 8; > + break; > + case NOA1305_INTEGR_TIME_400MS: > + *val = 100; > + *val2 = 77 * 4; > + case NOA1305_INTEGR_TIME_200MS: > + *val = 100; > + *val2 = 77 * 2; > + break; > + case NOA1305_INTEGR_TIME_100MS: > + *val = 100; > + *val2 = 77; > + break; > + case NOA1305_INTEGR_TIME_50MS: > + *val = 1000; > + *val2 = 77 * 5; > + break; > + case NOA1305_INTEGR_TIME_25MS: > + *val = 10000; > + *val2 = 77 * 25; > + break; > + case NOA1305_INTEGR_TIME_12_5MS: > + *val = 100000; > + *val2 = 77 * 125; > + break; > + case NOA1305_INTEGR_TIME_6_25MS: > + *val = 1000000; > + *val2 = 77 * 625; > + break; > + default: > + return -EINVAL; > + } > + > + return IIO_VAL_FRACTIONAL; > +} > + > +static const struct iio_chan_spec noa1305_channels[] = { > + { > + .type = IIO_LIGHT, > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), > + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), > + } > +}; > + > +static int noa1305_read_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, > + int *val, int *val2, long mask) > +{ > + int ret = -EINVAL; > + struct noa1305_priv *priv = iio_priv(indio_dev); > + > + switch (mask) { > + case IIO_CHAN_INFO_RAW: > + switch (chan->type) { > + case IIO_LIGHT: > + ret = noa1305_measure(priv); > + if (ret < 0) > + return ret; > + *val = ret; > + return IIO_VAL_INT; > + default: > + break; > + } > + break; > + case IIO_CHAN_INFO_SCALE: > + switch (chan->type) { > + case IIO_LIGHT: > + return noa1305_scale(priv, val, val2); > + default: > + break; > + } > + break; > + default: > + break; > + } > + > + return ret; > +} > + > +static const struct iio_info noa1305_info = { > + .read_raw = noa1305_read_raw, > +}; > + > +static bool noa1305_writable_reg(struct device *dev, unsigned int reg) > +{ > + switch (reg) { > + case NOA1305_REG_POWER_CONTROL: > + case NOA1305_REG_RESET: > + case NOA1305_REG_INTEGRATION_TIME: > + case NOA1305_REG_INT_SELECT: > + case NOA1305_REG_INT_THRESH_LSB: > + case NOA1305_REG_INT_THRESH_MSB: > + return true; > + default: > + return false; > + } > +} > + > +static const struct regmap_config noa1305_regmap_config = { > + .name = NOA1305_DRIVER_NAME, > + .reg_bits = 8, > + .val_bits = 8, > + .max_register = NOA1305_REG_DEVICE_ID_MSB, > + .writeable_reg = noa1305_writable_reg, > +}; > + > +static void noa1305_reg_remove(void *data) > +{ > + struct noa1305_priv *priv = data; > + > + regulator_disable(priv->vin_reg); > +} > + > +static int noa1305_probe(struct i2c_client *client, > + const struct i2c_device_id *id) > +{ > + struct noa1305_priv *priv; > + struct iio_dev *indio_dev; > + struct regmap *regmap; > + __le16 data; > + unsigned int dev_id; > + int ret; > + > + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*priv)); > + if (!indio_dev) > + return -ENOMEM; > + > + regmap = devm_regmap_init_i2c(client, &noa1305_regmap_config); > + if (IS_ERR(regmap)) { > + dev_err(&client->dev, "Regmap initialization failed.\n"); > + return PTR_ERR(regmap); > + } > + > + priv = iio_priv(indio_dev); > + > + priv->vin_reg = devm_regulator_get(&client->dev, "vin"); > + if (IS_ERR(priv->vin_reg)) { > + dev_err(&client->dev, "get regulator vin failed\n"); > + return PTR_ERR(priv->vin_reg); > + } > + > + ret = regulator_enable(priv->vin_reg); > + if (ret) { > + dev_err(&client->dev, "enable regulator vin failed\n"); > + return ret; > + } > + > + ret = devm_add_action_or_reset(&client->dev, noa1305_reg_remove, priv); > + if (ret) { > + dev_err(&client->dev, "addition of devm action failed\n"); > + return ret; > + } > + > + i2c_set_clientdata(client, indio_dev); > + priv->client = client; > + priv->regmap = regmap; > + > + ret = regmap_bulk_read(regmap, NOA1305_REG_DEVICE_ID_LSB, &data, 2); > + if (ret < 0) { > + dev_err(&client->dev, "ID reading failed: %d\n", ret); > + return ret; > + } > + > + dev_id = le16_to_cpu(data); > + if (dev_id != NOA1305_DEVICE_ID) { > + dev_err(&client->dev, "Unknown device ID: 0x%x\n", dev_id); > + return -ENODEV; > + } > + > + ret = regmap_write(regmap, NOA1305_REG_POWER_CONTROL, > + NOA1305_POWER_CONTROL_ON); > + if (ret < 0) { > + dev_err(&client->dev, "Enabling power control failed\n"); > + return ret; > + } > + > + ret = regmap_write(regmap, NOA1305_REG_RESET, NOA1305_RESET_RESET); > + if (ret < 0) { > + dev_err(&client->dev, "Device reset failed\n"); > + return ret; > + } > + > + ret = regmap_write(regmap, NOA1305_REG_INTEGRATION_TIME, > + NOA1305_INTEGR_TIME_800MS); > + if (ret < 0) { > + dev_err(&client->dev, "Setting integration time failed\n"); > + return ret; > + } > + > + indio_dev->dev.parent = &client->dev; > + indio_dev->info = &noa1305_info; > + indio_dev->channels = noa1305_channels; > + indio_dev->num_channels = ARRAY_SIZE(noa1305_channels); > + indio_dev->name = NOA1305_DRIVER_NAME; > + indio_dev->modes = INDIO_DIRECT_MODE; > + > + ret = devm_iio_device_register(&client->dev, indio_dev); > + if (ret) > + dev_err(&client->dev, "registering device failed\n"); > + > + return ret; > +} > + > +static const struct of_device_id noa1305_of_match[] = { > + { .compatible = "onnn,noa1305" }, > + { } > +}; > +MODULE_DEVICE_TABLE(of, noa1305_of_match); > + > +static const struct i2c_device_id noa1305_ids[] = { > + { "noa1305", 0 }, > + { } > +}; > +MODULE_DEVICE_TABLE(i2c, noa1305_id); > + > +static struct i2c_driver noa1305_driver = { > + .driver = { > + .name = NOA1305_DRIVER_NAME, > + .of_match_table = noa1305_of_match, > + }, > + .probe = noa1305_probe, > + .id_table = noa1305_ids, > +}; > + > +module_i2c_driver(noa1305_driver); > + > +MODULE_AUTHOR("Sergei Miroshnichenko <sergei...@emcraft.com>"); > +MODULE_AUTHOR("Martyn Welch <martyn.we...@collabora.com"); > +MODULE_DESCRIPTION("ON Semiconductor NOA1305 ambient light sensor"); > +MODULE_LICENSE("GPL");
