drivers/iio/light/bh1780.c

Source file repositories/reference/linux-study-clean/drivers/iio/light/bh1780.c

File Facts

System
Linux kernel
Corpus path
drivers/iio/light/bh1780.c
Extension
.c
Size
7060 bytes
Lines
286
Domain
Driver Families
Bucket
drivers/iio
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct bh1780_data {
	struct i2c_client *client;
};

static int bh1780_write(struct bh1780_data *bh1780, u8 reg, u8 val)
{
	int ret = i2c_smbus_write_byte_data(bh1780->client,
					    BH1780_CMD_BIT | reg,
					    val);
	if (ret < 0)
		dev_err(&bh1780->client->dev,
			"i2c_smbus_write_byte_data failed error "
			"%d, register %01x\n",
			ret, reg);
	return ret;
}

static int bh1780_read(struct bh1780_data *bh1780, u8 reg)
{
	int ret = i2c_smbus_read_byte_data(bh1780->client,
					   BH1780_CMD_BIT | reg);
	if (ret < 0)
		dev_err(&bh1780->client->dev,
			"i2c_smbus_read_byte_data failed error "
			"%d, register %01x\n",
			ret, reg);
	return ret;
}

static int bh1780_read_word(struct bh1780_data *bh1780, u8 reg)
{
	int ret = i2c_smbus_read_word_data(bh1780->client,
					   BH1780_CMD_BIT | reg);
	if (ret < 0)
		dev_err(&bh1780->client->dev,
			"i2c_smbus_read_word_data failed error "
			"%d, register %01x\n",
			ret, reg);
	return ret;
}

static int bh1780_debugfs_reg_access(struct iio_dev *indio_dev,
			      unsigned int reg, unsigned int writeval,
			      unsigned int *readval)
{
	struct bh1780_data *bh1780 = iio_priv(indio_dev);
	int ret;

	if (!readval)
		return bh1780_write(bh1780, (u8)reg, (u8)writeval);

	ret = bh1780_read(bh1780, (u8)reg);
	if (ret < 0)
		return ret;

	*readval = ret;

	return 0;
}

static int bh1780_read_raw(struct iio_dev *indio_dev,
			   struct iio_chan_spec const *chan,
			   int *val, int *val2, long mask)
{
	struct bh1780_data *bh1780 = iio_priv(indio_dev);
	int value;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		switch (chan->type) {
		case IIO_LIGHT:
			pm_runtime_get_sync(&bh1780->client->dev);
			value = bh1780_read_word(bh1780, BH1780_REG_DLOW);
			pm_runtime_put_autosuspend(&bh1780->client->dev);
			if (value < 0)
				return value;
			*val = value;

			return IIO_VAL_INT;
		default:
			return -EINVAL;
		}
	case IIO_CHAN_INFO_INT_TIME:
		*val = 0;
		*val2 = BH1780_INTERVAL * 1000;
		return IIO_VAL_INT_PLUS_MICRO;
	default:
		return -EINVAL;
	}
}

Annotation

Implementation Notes