示例#1
0
static ssize_t store_resolution(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct isl29018_chip *chip = iio_priv(indio_dev);
	struct i2c_client *client = chip->client;
	int status;
	unsigned long lval;
	unsigned int new_adc_bit;

	if (strict_strtoul(buf, 10, &lval))
		return -EINVAL;
	if (!(lval == 4 || lval == 8 || lval == 12 || lval == 16)) {
		dev_err(dev, "The resolution is not supported\n");
		return -EINVAL;
	}

	mutex_lock(&chip->lock);
	status = isl29018_set_resolution(client, lval, &new_adc_bit);
	if (status < 0) {
		mutex_unlock(&chip->lock);
		dev_err(dev, "Error in setting resolution\n");
		return status;
	}
	chip->adc_bit = new_adc_bit;
	mutex_unlock(&chip->lock);

	return count;
}
示例#2
0
static int isl29018_chip_init(struct i2c_client *client)
{
	struct isl29018_chip *chip = i2c_get_clientdata(client);
	bool status;
	int i;
	int new_adc_bit;
	unsigned int new_range;

	for (i = 0; i < ARRAY_SIZE(chip->reg_cache); i++) {
		chip->reg_cache[i] = 0;
	}

	/* set defaults */
	isl29018_write_data(client, ISL29018_REG_TEST,
		0x00, 0xFF, 0);
	isl29018_write_data(client, ISL29018_REG_ADD_COMMAND1,
		0x00, 0xFF, 0);
	msleep(1);

	status = isl29018_set_range(client, chip->range, &new_range);
	if (status)
		status = isl29018_set_resolution(client, chip->adc_bit,
				&new_adc_bit);
	if (!status) {
		dev_err(&client->dev, "Init of isl29018 fails\n");
		return -ENODEV;
	}

	return 0;
}
static int isl29018_chip_init(struct isl29018_chip *chip)
{
	int status;
	int new_adc_bit;
	unsigned int new_range;

	/* Code added per Intersil Application Note 1534:
	 *     When VDD sinks to approximately 1.8V or below, some of
	 * the part's registers may change their state. When VDD
	 * recovers to 2.25V (or greater), the part may thus be in an
	 * unknown mode of operation. The user can return the part to
	 * a known mode of operation either by (a) setting VDD = 0V for
	 * 1 second or more and then powering back up with a slew rate
	 * of 0.5V/ms or greater, or (b) via I2C disable all ALS/PROX
	 * conversions, clear the test registers, and then rewrite all
	 * registers to the desired values.
	 * ...
	 * FOR ISL29011, ISL29018, ISL29021, ISL29023
	 * 1. Write 0x00 to register 0x08 (TEST)
	 * 2. Write 0x00 to register 0x00 (CMD1)
	 * 3. Rewrite all registers to the desired values
	 *
	 * ISL29018 Data Sheet (FN6619.1, Feb 11, 2010) essentially says
	 * the same thing EXCEPT the data sheet asks for a 1ms delay after
	 * writing the CMD1 register.
	 */
	status = regmap_write(chip->regmap, ISL29018_REG_TEST, 0x0);
	if (status < 0) {
		dev_err(chip->dev, "Failed to clear isl29018 TEST reg."
					"(%d)\n", status);
		return status;
	}

	/* See Intersil AN1534 comments above.
	 * "Operating Mode" (COMMAND1) register is reprogrammed when
	 * data is read from the device.
	 */
	status = regmap_write(chip->regmap, ISL29018_REG_ADD_COMMAND1, 0);
	if (status < 0) {
		dev_err(chip->dev, "Failed to clear isl29018 CMD1 reg."
					"(%d)\n", status);
		return status;
	}

	msleep(1);	/* per data sheet, page 10 */

	/* set defaults */
	status = isl29018_set_range(chip, chip->range, &new_range);
	if (status < 0) {
		dev_err(chip->dev, "Init of isl29018 fails\n");
		return status;
	}

	status = isl29018_set_resolution(chip, chip->adc_bit,
						&new_adc_bit);

	return 0;
}