On Tue, Mar 10, 2015 at 1:53 PM, Daniel Baluta <daniel.baluta@xxxxxxxxx> wrote: > Minimal implementation providing raw light intensity > and integration time attribute. > > Userspace applications can use GREEN channel for raw > illuminance readings following this table: > > Integration Time | G Sensitivity > ================================ > 40 ms | 0.18 > 80 ms | 0.09 > 160 ms | 0.045 > 320 ms | 0.0225 > 640 ms | 0.01125 > 1280 ms | 0.005625 > > Signed-off-by: Daniel Baluta <daniel.baluta@xxxxxxxxx> Changes since v1: * fixed nits after Peter's review - https://lkml.org/lkml/2015/1/22/196 * removed IIO_LIGHT channel since illuminance can be computed in userspace based on GREEN channel > --- > drivers/iio/light/Kconfig | 10 ++ > drivers/iio/light/Makefile | 1 + > drivers/iio/light/cm3323.c | 273 +++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 284 insertions(+) > create mode 100644 drivers/iio/light/cm3323.c > > diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig > index ae68c64..cd937d9 100644 > --- a/drivers/iio/light/Kconfig > +++ b/drivers/iio/light/Kconfig > @@ -59,6 +59,16 @@ config CM3232 > To compile this driver as a module, choose M here: > the module will be called cm3232. > > +config CM3323 > + depends on I2C > + tristate "Capella CM3323 color light sensor" > + help > + Say Y here if you want to build a driver for Capela CM3323 > + color sensor. > + > + To compile this driver as a module, choose M here: the module will > + be called cm3323. > + > config CM36651 > depends on I2C > tristate "CM36651 driver" > diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile > index b12a516..ad7c30f 100644 > --- a/drivers/iio/light/Makefile > +++ b/drivers/iio/light/Makefile > @@ -8,6 +8,7 @@ obj-$(CONFIG_AL3320A) += al3320a.o > obj-$(CONFIG_APDS9300) += apds9300.o > obj-$(CONFIG_CM32181) += cm32181.o > obj-$(CONFIG_CM3232) += cm3232.o > +obj-$(CONFIG_CM3323) += cm3323.o > obj-$(CONFIG_CM36651) += cm36651.o > obj-$(CONFIG_GP2AP020A00F) += gp2ap020a00f.o > obj-$(CONFIG_HID_SENSOR_ALS) += hid-sensor-als.o > diff --git a/drivers/iio/light/cm3323.c b/drivers/iio/light/cm3323.c > new file mode 100644 > index 0000000..a3f040e > --- /dev/null > +++ b/drivers/iio/light/cm3323.c > @@ -0,0 +1,273 @@ > +/* > + * CM3323 - Capella Color Light Sensor > + * > + * Copyright (c) 2015, Intel Corporation. > + * > + * 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 > + * directory of this archive for more details. > + * > + * IIO driver for CM3323 (7-bit I2C slave address 0x10) > + * > + * TODO: calibscale to correct the lens factor > + */ > +#include <linux/module.h> > +#include <linux/init.h> > +#include <linux/i2c.h> > +#include <linux/mutex.h> > + > +#include <linux/iio/iio.h> > +#include <linux/iio/sysfs.h> > + > +#define CM3323_DRV_NAME "cm3323" > + > +#define CM3323_CMD_CONF 0x00 > +#define CM3323_CMD_RED_DATA 0x08 > +#define CM3323_CMD_GREEN_DATA 0x09 > +#define CM3323_CMD_BLUE_DATA 0x0A > +#define CM3323_CMD_CLEAR_DATA 0x0B > + > +#define CM3323_CONF_SD_BIT BIT(0) /* sensor disable */ > +#define CM3323_CONF_AF_BIT BIT(1) /* auto/manual force mode */ > +#define CM3323_CONF_IT_MASK (BIT(4) | BIT(5) | BIT(6)) > +#define CM3323_CONF_IT_SHIFT 4 > + > +#define CM3323_INT_TIME_AVAILABLE "0.04 0.08 0.16 0.32 0.64 1.28" > + > +static const struct { > + int val; > + int val2; > +} cm3323_int_time[] = { > + {0, 40000}, /* 40 ms */ > + {0, 80000}, /* 80 ms */ > + {0, 160000}, /* 160 ms */ > + {0, 320000}, /* 320 ms */ > + {0, 640000}, /* 640 ms */ > + {1, 280000}, /* 1280 ms */ > +}; > + > +struct cm3323_data { > + struct i2c_client *client; > + u16 reg_conf; > + struct mutex mutex; > +}; > + > +#define CM3323_COLOR_CHANNEL(_color, _addr) { \ > + .type = IIO_INTENSITY, \ > + .modified = 1, \ > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ > + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME), \ > + .channel2 = IIO_MOD_LIGHT_##_color, \ > + .address = _addr, \ > +} > + > +static const struct iio_chan_spec cm3323_channels[] = { > + CM3323_COLOR_CHANNEL(RED, CM3323_CMD_RED_DATA), > + CM3323_COLOR_CHANNEL(GREEN, CM3323_CMD_GREEN_DATA), > + CM3323_COLOR_CHANNEL(BLUE, CM3323_CMD_BLUE_DATA), > + CM3323_COLOR_CHANNEL(CLEAR, CM3323_CMD_CLEAR_DATA), > +}; > + > +static IIO_CONST_ATTR_INT_TIME_AVAIL(CM3323_INT_TIME_AVAILABLE); > + > +static struct attribute *cm3323_attributes[] = { > + &iio_const_attr_integration_time_available.dev_attr.attr, > + NULL > +}; > + > +static const struct attribute_group cm3323_attribute_group = { > + .attrs = cm3323_attributes, > +}; > + > +static int cm3323_init(struct iio_dev *indio_dev) > +{ > + int ret; > + struct cm3323_data *data = iio_priv(indio_dev); > + > + ret = i2c_smbus_read_word_data(data->client, CM3323_CMD_CONF); > + if (ret < 0) { > + dev_err(&data->client->dev, "Error reading reg_conf\n"); > + return ret; > + } > + > + /* enable sensor and set auto force mode */ > + ret &= ~(CM3323_CONF_SD_BIT | CM3323_CONF_AF_BIT); > + > + ret = i2c_smbus_write_word_data(data->client, CM3323_CMD_CONF, ret); > + if (ret < 0) { > + dev_err(&data->client->dev, "Error writing reg_conf\n"); > + return ret; > + } > + > + data->reg_conf = ret; > + > + return 0; > +} > + > +static int cm3323_set_it_bits(struct cm3323_data *data, int val, int val2) > +{ > + int i, ret; > + u16 reg_conf; > + > + for (i = 0; i < ARRAY_SIZE(cm3323_int_time); i++) { > + if (val == cm3323_int_time[i].val && > + val2 == cm3323_int_time[i].val2) { > + reg_conf = data->reg_conf; > + reg_conf |= i << CM3323_CONF_IT_SHIFT; > + > + ret = i2c_smbus_write_word_data(data->client, > + CM3323_CMD_CONF, reg_conf); > + if (ret < 0) > + return ret; > + > + data->reg_conf = reg_conf; > + return 0; > + } > + } > + return -EINVAL; > +} > + > +static int cm3323_get_it_bits(struct cm3323_data *data) > +{ > + int bits; > + > + bits = (data->reg_conf & CM3323_CONF_IT_MASK) >> > + CM3323_CONF_IT_SHIFT; > + > + if (bits >= ARRAY_SIZE(cm3323_int_time)) > + return -EINVAL; > + return bits; > +} > + > +static int cm3323_read_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, int *val, > + int *val2, long mask) > +{ > + int i, ret; > + struct cm3323_data *data = iio_priv(indio_dev); > + > + switch (mask) { > + case IIO_CHAN_INFO_RAW: > + mutex_lock(&data->mutex); > + ret = i2c_smbus_read_word_data(data->client, chan->address); > + if (ret < 0) { > + mutex_unlock(&data->mutex); > + return ret; > + } > + *val = ret; > + mutex_unlock(&data->mutex); > + > + return IIO_VAL_INT; > + case IIO_CHAN_INFO_INT_TIME: > + mutex_lock(&data->mutex); > + i = cm3323_get_it_bits(data); > + if (i < 0) { > + mutex_unlock(&data->mutex); > + return -EINVAL; > + } > + > + *val = cm3323_int_time[i].val; > + *val2 = cm3323_int_time[i].val2; > + mutex_unlock(&data->mutex); > + > + return IIO_VAL_INT_PLUS_MICRO; > + default: > + return -EINVAL; > + } > +} > + > +static int cm3323_write_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, int val, > + int val2, long mask) > +{ > + struct cm3323_data *data = iio_priv(indio_dev); > + int ret; > + > + switch (mask) { > + case IIO_CHAN_INFO_INT_TIME: > + mutex_lock(&data->mutex); > + ret = cm3323_set_it_bits(data, val, val2); > + mutex_unlock(&data->mutex); > + > + return ret; > + default: > + return -EINVAL; > + } > +} > + > +static const struct iio_info cm3323_info = { > + .driver_module = THIS_MODULE, > + .read_raw = cm3323_read_raw, > + .write_raw = cm3323_write_raw, > + .attrs = &cm3323_attribute_group, > +}; > + > +static int cm3323_probe(struct i2c_client *client, > + const struct i2c_device_id *id) > +{ > + struct cm3323_data *data; > + struct iio_dev *indio_dev; > + int ret; > + > + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); > + if (!indio_dev) > + return -ENOMEM; > + > + data = iio_priv(indio_dev); > + i2c_set_clientdata(client, indio_dev); > + data->client = client; > + > + mutex_init(&data->mutex); > + > + indio_dev->dev.parent = &client->dev; > + indio_dev->info = &cm3323_info; > + indio_dev->name = CM3323_DRV_NAME; > + indio_dev->channels = cm3323_channels; > + indio_dev->num_channels = ARRAY_SIZE(cm3323_channels); > + indio_dev->modes = INDIO_DIRECT_MODE; > + > + ret = cm3323_init(indio_dev); > + if (ret < 0) { > + dev_err(&client->dev, "cm3323 chip init failed\n"); > + return ret; > + } > + return devm_iio_device_register(&client->dev, indio_dev); > +} > + > +static int cm3323_remove(struct i2c_client *client) > +{ > + struct iio_dev *indio_dev = i2c_get_clientdata(client); > + struct cm3323_data *data = iio_priv(indio_dev); > + int ret; > + > + mutex_lock(&data->mutex); > + /* disable sensor */ > + ret = i2c_smbus_write_word_data(client, CM3323_CMD_CONF, > + CM3323_CONF_SD_BIT); > + if (ret < 0) > + dev_err(&client->dev, "Error writing reg_conf\n"); > + > + mutex_unlock(&data->mutex); > + return ret; > +} > + > +static const struct i2c_device_id cm3323_id[] = { > + {"cm3323", 0}, > + {} > +}; > +MODULE_DEVICE_TABLE(i2c, cm3323_id); > + > +static struct i2c_driver cm3323_driver = { > + .driver = { > + .name = CM3323_DRV_NAME, > + }, > + .probe = cm3323_probe, > + .remove = cm3323_remove, > + .id_table = cm3323_id, > +}; > + > +module_i2c_driver(cm3323_driver); > + > +MODULE_AUTHOR("Daniel Baluta <daniel.baluta@xxxxxxxxx>"); > +MODULE_DESCRIPTION("Capella CM3323 Color Light Sensor driver"); > +MODULE_LICENSE("GPL v2"); > -- > 1.9.1 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-iio" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
