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; }