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278 lines
6.3 KiB
278 lines
6.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* CM3323 - Capella Color Light Sensor |
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* |
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* Copyright (c) 2015, Intel Corporation. |
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* |
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* IIO driver for CM3323 (7-bit I2C slave address 0x10) |
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* |
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* TODO: calibscale to correct the lens factor |
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*/ |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/i2c.h> |
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#include <linux/mutex.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/sysfs.h> |
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#define CM3323_DRV_NAME "cm3323" |
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#define CM3323_CMD_CONF 0x00 |
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#define CM3323_CMD_RED_DATA 0x08 |
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#define CM3323_CMD_GREEN_DATA 0x09 |
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#define CM3323_CMD_BLUE_DATA 0x0A |
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#define CM3323_CMD_CLEAR_DATA 0x0B |
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#define CM3323_CONF_SD_BIT BIT(0) /* sensor disable */ |
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#define CM3323_CONF_AF_BIT BIT(1) /* auto/manual force mode */ |
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#define CM3323_CONF_IT_MASK GENMASK(6, 4) |
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#define CM3323_CONF_IT_SHIFT 4 |
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#define CM3323_INT_TIME_AVAILABLE "0.04 0.08 0.16 0.32 0.64 1.28" |
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static const struct { |
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int val; |
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int val2; |
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} cm3323_int_time[] = { |
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{0, 40000}, /* 40 ms */ |
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{0, 80000}, /* 80 ms */ |
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{0, 160000}, /* 160 ms */ |
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{0, 320000}, /* 320 ms */ |
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{0, 640000}, /* 640 ms */ |
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{1, 280000}, /* 1280 ms */ |
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}; |
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struct cm3323_data { |
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struct i2c_client *client; |
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u16 reg_conf; |
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struct mutex mutex; |
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}; |
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#define CM3323_COLOR_CHANNEL(_color, _addr) { \ |
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.type = IIO_INTENSITY, \ |
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.modified = 1, \ |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME), \ |
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.channel2 = IIO_MOD_LIGHT_##_color, \ |
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.address = _addr, \ |
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} |
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static const struct iio_chan_spec cm3323_channels[] = { |
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CM3323_COLOR_CHANNEL(RED, CM3323_CMD_RED_DATA), |
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CM3323_COLOR_CHANNEL(GREEN, CM3323_CMD_GREEN_DATA), |
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CM3323_COLOR_CHANNEL(BLUE, CM3323_CMD_BLUE_DATA), |
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CM3323_COLOR_CHANNEL(CLEAR, CM3323_CMD_CLEAR_DATA), |
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}; |
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static IIO_CONST_ATTR_INT_TIME_AVAIL(CM3323_INT_TIME_AVAILABLE); |
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static struct attribute *cm3323_attributes[] = { |
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&iio_const_attr_integration_time_available.dev_attr.attr, |
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NULL |
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}; |
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static const struct attribute_group cm3323_attribute_group = { |
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.attrs = cm3323_attributes, |
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}; |
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static int cm3323_init(struct iio_dev *indio_dev) |
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{ |
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int ret; |
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struct cm3323_data *data = iio_priv(indio_dev); |
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ret = i2c_smbus_read_word_data(data->client, CM3323_CMD_CONF); |
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if (ret < 0) { |
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dev_err(&data->client->dev, "Error reading reg_conf\n"); |
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return ret; |
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} |
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/* enable sensor and set auto force mode */ |
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ret &= ~(CM3323_CONF_SD_BIT | CM3323_CONF_AF_BIT); |
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ret = i2c_smbus_write_word_data(data->client, CM3323_CMD_CONF, ret); |
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if (ret < 0) { |
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dev_err(&data->client->dev, "Error writing reg_conf\n"); |
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return ret; |
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} |
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data->reg_conf = ret; |
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return 0; |
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} |
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static void cm3323_disable(void *data) |
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{ |
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int ret; |
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struct iio_dev *indio_dev = data; |
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struct cm3323_data *cm_data = iio_priv(indio_dev); |
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ret = i2c_smbus_write_word_data(cm_data->client, CM3323_CMD_CONF, |
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CM3323_CONF_SD_BIT); |
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if (ret < 0) |
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dev_err(&cm_data->client->dev, "Error writing reg_conf\n"); |
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} |
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static int cm3323_set_it_bits(struct cm3323_data *data, int val, int val2) |
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{ |
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int i, ret; |
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u16 reg_conf; |
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for (i = 0; i < ARRAY_SIZE(cm3323_int_time); i++) { |
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if (val == cm3323_int_time[i].val && |
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val2 == cm3323_int_time[i].val2) { |
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reg_conf = data->reg_conf & ~CM3323_CONF_IT_MASK; |
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reg_conf |= i << CM3323_CONF_IT_SHIFT; |
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ret = i2c_smbus_write_word_data(data->client, |
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CM3323_CMD_CONF, |
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reg_conf); |
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if (ret < 0) |
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return ret; |
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data->reg_conf = reg_conf; |
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return 0; |
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} |
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} |
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return -EINVAL; |
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} |
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static int cm3323_get_it_bits(struct cm3323_data *data) |
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{ |
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int bits; |
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bits = (data->reg_conf & CM3323_CONF_IT_MASK) >> |
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CM3323_CONF_IT_SHIFT; |
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if (bits >= ARRAY_SIZE(cm3323_int_time)) |
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return -EINVAL; |
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return bits; |
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} |
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static int cm3323_read_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, int *val, |
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int *val2, long mask) |
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{ |
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int ret; |
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struct cm3323_data *data = iio_priv(indio_dev); |
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switch (mask) { |
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case IIO_CHAN_INFO_RAW: |
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mutex_lock(&data->mutex); |
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ret = i2c_smbus_read_word_data(data->client, chan->address); |
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if (ret < 0) { |
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mutex_unlock(&data->mutex); |
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return ret; |
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} |
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*val = ret; |
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mutex_unlock(&data->mutex); |
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return IIO_VAL_INT; |
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case IIO_CHAN_INFO_INT_TIME: |
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mutex_lock(&data->mutex); |
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ret = cm3323_get_it_bits(data); |
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if (ret < 0) { |
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mutex_unlock(&data->mutex); |
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return ret; |
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} |
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*val = cm3323_int_time[ret].val; |
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*val2 = cm3323_int_time[ret].val2; |
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mutex_unlock(&data->mutex); |
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return IIO_VAL_INT_PLUS_MICRO; |
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default: |
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return -EINVAL; |
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} |
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} |
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static int cm3323_write_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, int val, |
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int val2, long mask) |
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{ |
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struct cm3323_data *data = iio_priv(indio_dev); |
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int ret; |
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switch (mask) { |
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case IIO_CHAN_INFO_INT_TIME: |
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mutex_lock(&data->mutex); |
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ret = cm3323_set_it_bits(data, val, val2); |
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mutex_unlock(&data->mutex); |
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return ret; |
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default: |
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return -EINVAL; |
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} |
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} |
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static const struct iio_info cm3323_info = { |
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.read_raw = cm3323_read_raw, |
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.write_raw = cm3323_write_raw, |
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.attrs = &cm3323_attribute_group, |
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}; |
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static int cm3323_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct cm3323_data *data; |
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struct iio_dev *indio_dev; |
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int ret; |
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); |
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if (!indio_dev) |
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return -ENOMEM; |
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data = iio_priv(indio_dev); |
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i2c_set_clientdata(client, indio_dev); |
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data->client = client; |
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mutex_init(&data->mutex); |
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indio_dev->info = &cm3323_info; |
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indio_dev->name = CM3323_DRV_NAME; |
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indio_dev->channels = cm3323_channels; |
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indio_dev->num_channels = ARRAY_SIZE(cm3323_channels); |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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ret = cm3323_init(indio_dev); |
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if (ret < 0) { |
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dev_err(&client->dev, "cm3323 chip init failed\n"); |
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return ret; |
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} |
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ret = devm_add_action_or_reset(&client->dev, cm3323_disable, indio_dev); |
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if (ret < 0) |
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return ret; |
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return devm_iio_device_register(&client->dev, indio_dev); |
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} |
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static const struct i2c_device_id cm3323_id[] = { |
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{"cm3323", 0}, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(i2c, cm3323_id); |
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static const struct of_device_id cm3323_of_match[] = { |
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{ .compatible = "capella,cm3323", }, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(of, cm3323_of_match); |
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static struct i2c_driver cm3323_driver = { |
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.driver = { |
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.name = CM3323_DRV_NAME, |
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.of_match_table = cm3323_of_match, |
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}, |
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.probe = cm3323_probe, |
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.id_table = cm3323_id, |
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}; |
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module_i2c_driver(cm3323_driver); |
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MODULE_AUTHOR("Daniel Baluta <[email protected]>"); |
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MODULE_DESCRIPTION("Capella CM3323 Color Light Sensor driver"); |
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MODULE_LICENSE("GPL v2");
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