| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * isl29125.c - Support for Intersil ISL29125 RGB light sensor |
| * |
| * Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net> |
| * |
| * RGB light sensor with 16-bit channels for red, green, blue); |
| * 7-bit I2C slave address 0x44 |
| * |
| * TODO: interrupt support, IR compensation, thresholds, 12bit |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/i2c.h> |
| #include <linux/delay.h> |
| #include <linux/pm.h> |
| |
| #include <linux/iio/iio.h> |
| #include <linux/iio/sysfs.h> |
| #include <linux/iio/trigger_consumer.h> |
| #include <linux/iio/buffer.h> |
| #include <linux/iio/triggered_buffer.h> |
| |
| #define ISL29125_DRV_NAME "isl29125" |
| |
| #define ISL29125_DEVICE_ID 0x00 |
| #define ISL29125_CONF1 0x01 |
| #define ISL29125_CONF2 0x02 |
| #define ISL29125_CONF3 0x03 |
| #define ISL29125_STATUS 0x08 |
| #define ISL29125_GREEN_DATA 0x09 |
| #define ISL29125_RED_DATA 0x0b |
| #define ISL29125_BLUE_DATA 0x0d |
| |
| #define ISL29125_ID 0x7d |
| |
| #define ISL29125_MODE_MASK GENMASK(2, 0) |
| #define ISL29125_MODE_PD 0x0 |
| #define ISL29125_MODE_G 0x1 |
| #define ISL29125_MODE_R 0x2 |
| #define ISL29125_MODE_B 0x3 |
| #define ISL29125_MODE_RGB 0x5 |
| |
| #define ISL29125_SENSING_RANGE_0 5722 /* 375 lux full range */ |
| #define ISL29125_SENSING_RANGE_1 152590 /* 10k lux full range */ |
| |
| #define ISL29125_MODE_RANGE BIT(3) |
| |
| #define ISL29125_STATUS_CONV BIT(1) |
| |
| struct isl29125_data { |
| struct i2c_client *client; |
| u8 conf1; |
| /* Ensure timestamp is naturally aligned */ |
| struct { |
| u16 chans[3]; |
| s64 timestamp __aligned(8); |
| } scan; |
| }; |
| |
| #define ISL29125_CHANNEL(_color, _si) { \ |
| .type = IIO_INTENSITY, \ |
| .modified = 1, \ |
| .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
| .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ |
| .channel2 = IIO_MOD_LIGHT_##_color, \ |
| .scan_index = _si, \ |
| .scan_type = { \ |
| .sign = 'u', \ |
| .realbits = 16, \ |
| .storagebits = 16, \ |
| .endianness = IIO_CPU, \ |
| }, \ |
| } |
| |
| static const struct iio_chan_spec isl29125_channels[] = { |
| ISL29125_CHANNEL(GREEN, 0), |
| ISL29125_CHANNEL(RED, 1), |
| ISL29125_CHANNEL(BLUE, 2), |
| IIO_CHAN_SOFT_TIMESTAMP(3), |
| }; |
| |
| static const struct { |
| u8 mode, data; |
| } isl29125_regs[] = { |
| {ISL29125_MODE_G, ISL29125_GREEN_DATA}, |
| {ISL29125_MODE_R, ISL29125_RED_DATA}, |
| {ISL29125_MODE_B, ISL29125_BLUE_DATA}, |
| }; |
| |
| static int isl29125_read_data(struct isl29125_data *data, int si) |
| { |
| int tries = 5; |
| int ret; |
| |
| ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, |
| data->conf1 | isl29125_regs[si].mode); |
| if (ret < 0) |
| return ret; |
| |
| msleep(101); |
| |
| while (tries--) { |
| ret = i2c_smbus_read_byte_data(data->client, ISL29125_STATUS); |
| if (ret < 0) |
| goto fail; |
| if (ret & ISL29125_STATUS_CONV) |
| break; |
| msleep(20); |
| } |
| |
| if (tries < 0) { |
| dev_err(&data->client->dev, "data not ready\n"); |
| ret = -EIO; |
| goto fail; |
| } |
| |
| ret = i2c_smbus_read_word_data(data->client, isl29125_regs[si].data); |
| |
| fail: |
| i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, data->conf1); |
| return ret; |
| } |
| |
| static int isl29125_read_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int *val, int *val2, long mask) |
| { |
| struct isl29125_data *data = iio_priv(indio_dev); |
| int ret; |
| |
| switch (mask) { |
| case IIO_CHAN_INFO_RAW: |
| ret = iio_device_claim_direct_mode(indio_dev); |
| if (ret) |
| return ret; |
| ret = isl29125_read_data(data, chan->scan_index); |
| iio_device_release_direct_mode(indio_dev); |
| if (ret < 0) |
| return ret; |
| *val = ret; |
| return IIO_VAL_INT; |
| case IIO_CHAN_INFO_SCALE: |
| *val = 0; |
| if (data->conf1 & ISL29125_MODE_RANGE) |
| *val2 = ISL29125_SENSING_RANGE_1; /*10k lux full range*/ |
| else |
| *val2 = ISL29125_SENSING_RANGE_0; /*375 lux full range*/ |
| return IIO_VAL_INT_PLUS_MICRO; |
| } |
| return -EINVAL; |
| } |
| |
| static int isl29125_write_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int val, int val2, long mask) |
| { |
| struct isl29125_data *data = iio_priv(indio_dev); |
| |
| switch (mask) { |
| case IIO_CHAN_INFO_SCALE: |
| if (val != 0) |
| return -EINVAL; |
| if (val2 == ISL29125_SENSING_RANGE_1) |
| data->conf1 |= ISL29125_MODE_RANGE; |
| else if (val2 == ISL29125_SENSING_RANGE_0) |
| data->conf1 &= ~ISL29125_MODE_RANGE; |
| else |
| return -EINVAL; |
| return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, |
| data->conf1); |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| static irqreturn_t isl29125_trigger_handler(int irq, void *p) |
| { |
| struct iio_poll_func *pf = p; |
| struct iio_dev *indio_dev = pf->indio_dev; |
| struct isl29125_data *data = iio_priv(indio_dev); |
| int i, j = 0; |
| |
| for_each_set_bit(i, indio_dev->active_scan_mask, |
| indio_dev->masklength) { |
| int ret = i2c_smbus_read_word_data(data->client, |
| isl29125_regs[i].data); |
| if (ret < 0) |
| goto done; |
| |
| data->scan.chans[j++] = ret; |
| } |
| |
| iio_push_to_buffers_with_timestamp(indio_dev, &data->scan, |
| iio_get_time_ns(indio_dev)); |
| |
| done: |
| iio_trigger_notify_done(indio_dev->trig); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static IIO_CONST_ATTR(scale_available, "0.005722 0.152590"); |
| |
| static struct attribute *isl29125_attributes[] = { |
| &iio_const_attr_scale_available.dev_attr.attr, |
| NULL |
| }; |
| |
| static const struct attribute_group isl29125_attribute_group = { |
| .attrs = isl29125_attributes, |
| }; |
| |
| static const struct iio_info isl29125_info = { |
| .read_raw = isl29125_read_raw, |
| .write_raw = isl29125_write_raw, |
| .attrs = &isl29125_attribute_group, |
| }; |
| |
| static int isl29125_buffer_preenable(struct iio_dev *indio_dev) |
| { |
| struct isl29125_data *data = iio_priv(indio_dev); |
| |
| data->conf1 |= ISL29125_MODE_RGB; |
| return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, |
| data->conf1); |
| } |
| |
| static int isl29125_buffer_predisable(struct iio_dev *indio_dev) |
| { |
| struct isl29125_data *data = iio_priv(indio_dev); |
| int ret; |
| |
| ret = iio_triggered_buffer_predisable(indio_dev); |
| if (ret < 0) |
| return ret; |
| |
| data->conf1 &= ~ISL29125_MODE_MASK; |
| data->conf1 |= ISL29125_MODE_PD; |
| return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, |
| data->conf1); |
| } |
| |
| static const struct iio_buffer_setup_ops isl29125_buffer_setup_ops = { |
| .preenable = isl29125_buffer_preenable, |
| .postenable = &iio_triggered_buffer_postenable, |
| .predisable = isl29125_buffer_predisable, |
| }; |
| |
| static int isl29125_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| struct isl29125_data *data; |
| struct iio_dev *indio_dev; |
| int ret; |
| |
| indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); |
| if (indio_dev == NULL) |
| return -ENOMEM; |
| |
| data = iio_priv(indio_dev); |
| i2c_set_clientdata(client, indio_dev); |
| data->client = client; |
| |
| indio_dev->dev.parent = &client->dev; |
| indio_dev->info = &isl29125_info; |
| indio_dev->name = ISL29125_DRV_NAME; |
| indio_dev->channels = isl29125_channels; |
| indio_dev->num_channels = ARRAY_SIZE(isl29125_channels); |
| indio_dev->modes = INDIO_DIRECT_MODE; |
| |
| ret = i2c_smbus_read_byte_data(data->client, ISL29125_DEVICE_ID); |
| if (ret < 0) |
| return ret; |
| if (ret != ISL29125_ID) |
| return -ENODEV; |
| |
| data->conf1 = ISL29125_MODE_PD | ISL29125_MODE_RANGE; |
| ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, |
| data->conf1); |
| if (ret < 0) |
| return ret; |
| |
| ret = i2c_smbus_write_byte_data(data->client, ISL29125_STATUS, 0); |
| if (ret < 0) |
| return ret; |
| |
| ret = iio_triggered_buffer_setup(indio_dev, NULL, |
| isl29125_trigger_handler, &isl29125_buffer_setup_ops); |
| if (ret < 0) |
| return ret; |
| |
| ret = iio_device_register(indio_dev); |
| if (ret < 0) |
| goto buffer_cleanup; |
| |
| return 0; |
| |
| buffer_cleanup: |
| iio_triggered_buffer_cleanup(indio_dev); |
| return ret; |
| } |
| |
| static int isl29125_powerdown(struct isl29125_data *data) |
| { |
| return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, |
| (data->conf1 & ~ISL29125_MODE_MASK) | ISL29125_MODE_PD); |
| } |
| |
| static int isl29125_remove(struct i2c_client *client) |
| { |
| struct iio_dev *indio_dev = i2c_get_clientdata(client); |
| |
| iio_device_unregister(indio_dev); |
| iio_triggered_buffer_cleanup(indio_dev); |
| isl29125_powerdown(iio_priv(indio_dev)); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM_SLEEP |
| static int isl29125_suspend(struct device *dev) |
| { |
| struct isl29125_data *data = iio_priv(i2c_get_clientdata( |
| to_i2c_client(dev))); |
| return isl29125_powerdown(data); |
| } |
| |
| static int isl29125_resume(struct device *dev) |
| { |
| struct isl29125_data *data = iio_priv(i2c_get_clientdata( |
| to_i2c_client(dev))); |
| return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, |
| data->conf1); |
| } |
| #endif |
| |
| static SIMPLE_DEV_PM_OPS(isl29125_pm_ops, isl29125_suspend, isl29125_resume); |
| |
| static const struct i2c_device_id isl29125_id[] = { |
| { "isl29125", 0 }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, isl29125_id); |
| |
| static struct i2c_driver isl29125_driver = { |
| .driver = { |
| .name = ISL29125_DRV_NAME, |
| .pm = &isl29125_pm_ops, |
| }, |
| .probe = isl29125_probe, |
| .remove = isl29125_remove, |
| .id_table = isl29125_id, |
| }; |
| module_i2c_driver(isl29125_driver); |
| |
| MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>"); |
| MODULE_DESCRIPTION("ISL29125 RGB light sensor driver"); |
| MODULE_LICENSE("GPL"); |