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;
}
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;
}