static int isl29018_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val,
int val2,
long mask)
{
struct isl29018_chip *chip = iio_priv(indio_dev);
int ret = -EINVAL;
mutex_lock(&chip->lock);
if (chip->suspended) {
ret = -EBUSY;
goto write_done;
}
switch (mask) {
case IIO_CHAN_INFO_CALIBSCALE:
if (chan->type == IIO_LIGHT) {
chip->calibscale = val;
chip->ucalibscale = val2;
ret = 0;
}
break;
case IIO_CHAN_INFO_INT_TIME:
if (chan->type == IIO_LIGHT && !val)
ret = isl29018_set_integration_time(chip, val2);
break;
case IIO_CHAN_INFO_SCALE:
if (chan->type == IIO_LIGHT)
ret = isl29018_set_scale(chip, val, val2);
break;
default:
break;
}
write_done:
mutex_unlock(&chip->lock);
return ret;
}
static int isl29018_chip_init(struct isl29018_chip *chip)
{
int status;
struct device *dev = regmap_get_device(chip->regmap);
if (chip->type == isl29035) {
status = isl29035_detect(chip);
if (status < 0)
return status;
}
/* 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(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(dev, "Failed to clear isl29018 CMD1 reg.(%d)\n",
status);
return status;
}
usleep_range(1000, 2000); /* per data sheet, page 10 */
/* set defaults */
status = isl29018_set_scale(chip, chip->scale.scale,
chip->scale.uscale);
if (status < 0) {
dev_err(dev, "Init of isl29018 fails\n");
return status;
}
status = isl29018_set_integration_time(chip,
isl29018_int_utimes[chip->type][chip->int_time]);
if (status < 0) {
dev_err(dev, "Init of isl29018 fails\n");
return status;
}
return 0;
}
