679 lines
17 KiB
C
679 lines
17 KiB
C
/*
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* A iio driver for the light sensor ISL 29018.
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*
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* IIO driver for monitoring ambient light intensity in luxi, proximity
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* sensing and infrared sensing.
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*
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* Copyright (c) 2010, NVIDIA Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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#include <linux/delay.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#define CONVERSION_TIME_MS 100
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#define ISL29018_REG_ADD_COMMAND1 0x00
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#define COMMMAND1_OPMODE_SHIFT 5
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#define COMMMAND1_OPMODE_MASK (7 << COMMMAND1_OPMODE_SHIFT)
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#define COMMMAND1_OPMODE_POWER_DOWN 0
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#define COMMMAND1_OPMODE_ALS_ONCE 1
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#define COMMMAND1_OPMODE_IR_ONCE 2
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#define COMMMAND1_OPMODE_PROX_ONCE 3
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#define ISL29018_REG_ADD_COMMANDII 0x01
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#define COMMANDII_RESOLUTION_SHIFT 2
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#define COMMANDII_RESOLUTION_MASK (0x3 << COMMANDII_RESOLUTION_SHIFT)
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#define COMMANDII_RANGE_SHIFT 0
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#define COMMANDII_RANGE_MASK (0x3 << COMMANDII_RANGE_SHIFT)
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#define COMMANDII_SCHEME_SHIFT 7
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#define COMMANDII_SCHEME_MASK (0x1 << COMMANDII_SCHEME_SHIFT)
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#define ISL29018_REG_ADD_DATA_LSB 0x02
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#define ISL29018_REG_ADD_DATA_MSB 0x03
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#define ISL29018_REG_TEST 0x08
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#define ISL29018_TEST_SHIFT 0
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#define ISL29018_TEST_MASK (0xFF << ISL29018_TEST_SHIFT)
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struct isl29018_chip {
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struct device *dev;
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struct regmap *regmap;
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struct mutex lock;
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unsigned int lux_scale;
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unsigned int lux_uscale;
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unsigned int range;
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unsigned int adc_bit;
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int prox_scheme;
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bool suspended;
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};
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static int isl29018_set_range(struct isl29018_chip *chip, unsigned long range,
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unsigned int *new_range)
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{
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static const unsigned long supp_ranges[] = {1000, 4000, 16000, 64000};
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int i;
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for (i = 0; i < ARRAY_SIZE(supp_ranges); ++i) {
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if (range <= supp_ranges[i]) {
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*new_range = (unsigned int)supp_ranges[i];
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break;
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}
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}
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if (i >= ARRAY_SIZE(supp_ranges))
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return -EINVAL;
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return regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII,
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COMMANDII_RANGE_MASK, i << COMMANDII_RANGE_SHIFT);
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}
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static int isl29018_set_resolution(struct isl29018_chip *chip,
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unsigned long adcbit, unsigned int *conf_adc_bit)
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{
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static const unsigned long supp_adcbit[] = {16, 12, 8, 4};
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int i;
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for (i = 0; i < ARRAY_SIZE(supp_adcbit); ++i) {
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if (adcbit >= supp_adcbit[i]) {
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*conf_adc_bit = (unsigned int)supp_adcbit[i];
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break;
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}
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}
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if (i >= ARRAY_SIZE(supp_adcbit))
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return -EINVAL;
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return regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII,
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COMMANDII_RESOLUTION_MASK,
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i << COMMANDII_RESOLUTION_SHIFT);
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}
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static int isl29018_read_sensor_input(struct isl29018_chip *chip, int mode)
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{
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int status;
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unsigned int lsb;
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unsigned int msb;
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/* Set mode */
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status = regmap_write(chip->regmap, ISL29018_REG_ADD_COMMAND1,
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mode << COMMMAND1_OPMODE_SHIFT);
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if (status) {
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dev_err(chip->dev,
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"Error in setting operating mode err %d\n", status);
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return status;
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}
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msleep(CONVERSION_TIME_MS);
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status = regmap_read(chip->regmap, ISL29018_REG_ADD_DATA_LSB, &lsb);
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if (status < 0) {
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dev_err(chip->dev,
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"Error in reading LSB DATA with err %d\n", status);
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return status;
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}
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status = regmap_read(chip->regmap, ISL29018_REG_ADD_DATA_MSB, &msb);
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if (status < 0) {
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dev_err(chip->dev,
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"Error in reading MSB DATA with error %d\n", status);
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return status;
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}
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dev_vdbg(chip->dev, "MSB 0x%x and LSB 0x%x\n", msb, lsb);
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return (msb << 8) | lsb;
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}
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static int isl29018_read_lux(struct isl29018_chip *chip, int *lux)
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{
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int lux_data;
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unsigned int data_x_range, lux_unshifted;
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lux_data = isl29018_read_sensor_input(chip, COMMMAND1_OPMODE_ALS_ONCE);
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if (lux_data < 0)
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return lux_data;
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/* To support fractional scaling, separate the unshifted lux
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* into two calculations: int scaling and micro-scaling.
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* lux_uscale ranges from 0-999999, so about 20 bits. Split
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* the /1,000,000 in two to reduce the risk of over/underflow.
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*/
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data_x_range = lux_data * chip->range;
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lux_unshifted = data_x_range * chip->lux_scale;
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lux_unshifted += data_x_range / 1000 * chip->lux_uscale / 1000;
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*lux = lux_unshifted >> chip->adc_bit;
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return 0;
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}
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static int isl29018_read_ir(struct isl29018_chip *chip, int *ir)
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{
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int ir_data;
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ir_data = isl29018_read_sensor_input(chip, COMMMAND1_OPMODE_IR_ONCE);
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if (ir_data < 0)
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return ir_data;
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*ir = ir_data;
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return 0;
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}
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static int isl29018_read_proximity_ir(struct isl29018_chip *chip, int scheme,
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int *near_ir)
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{
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int status;
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int prox_data = -1;
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int ir_data = -1;
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/* Do proximity sensing with required scheme */
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status = regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII,
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COMMANDII_SCHEME_MASK,
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scheme << COMMANDII_SCHEME_SHIFT);
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if (status) {
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dev_err(chip->dev, "Error in setting operating mode\n");
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return status;
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}
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prox_data = isl29018_read_sensor_input(chip,
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COMMMAND1_OPMODE_PROX_ONCE);
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if (prox_data < 0)
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return prox_data;
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if (scheme == 1) {
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*near_ir = prox_data;
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return 0;
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}
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ir_data = isl29018_read_sensor_input(chip, COMMMAND1_OPMODE_IR_ONCE);
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if (ir_data < 0)
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return ir_data;
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if (prox_data >= ir_data)
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*near_ir = prox_data - ir_data;
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else
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*near_ir = 0;
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return 0;
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}
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/* Sysfs interface */
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/* range */
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static ssize_t show_range(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct isl29018_chip *chip = iio_priv(indio_dev);
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return sprintf(buf, "%u\n", chip->range);
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}
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static ssize_t store_range(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct isl29018_chip *chip = iio_priv(indio_dev);
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int status;
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unsigned long lval;
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unsigned int new_range;
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if (strict_strtoul(buf, 10, &lval))
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return -EINVAL;
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if (!(lval == 1000UL || lval == 4000UL ||
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lval == 16000UL || lval == 64000UL)) {
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dev_err(dev, "The range is not supported\n");
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return -EINVAL;
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}
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mutex_lock(&chip->lock);
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status = isl29018_set_range(chip, lval, &new_range);
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if (status < 0) {
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mutex_unlock(&chip->lock);
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dev_err(dev,
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"Error in setting max range with err %d\n", status);
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return status;
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}
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chip->range = new_range;
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mutex_unlock(&chip->lock);
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return count;
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}
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/* resolution */
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static ssize_t show_resolution(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct isl29018_chip *chip = iio_priv(indio_dev);
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return sprintf(buf, "%u\n", chip->adc_bit);
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}
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static ssize_t store_resolution(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct isl29018_chip *chip = iio_priv(indio_dev);
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int status;
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unsigned long lval;
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unsigned int new_adc_bit;
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if (strict_strtoul(buf, 10, &lval))
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return -EINVAL;
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if (!(lval == 4 || lval == 8 || lval == 12 || lval == 16)) {
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dev_err(dev, "The resolution is not supported\n");
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return -EINVAL;
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}
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mutex_lock(&chip->lock);
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status = isl29018_set_resolution(chip, lval, &new_adc_bit);
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if (status < 0) {
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mutex_unlock(&chip->lock);
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dev_err(dev, "Error in setting resolution\n");
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return status;
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}
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chip->adc_bit = new_adc_bit;
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mutex_unlock(&chip->lock);
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return count;
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}
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/* proximity scheme */
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static ssize_t show_prox_infrared_suppression(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct isl29018_chip *chip = iio_priv(indio_dev);
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/* return the "proximity scheme" i.e. if the chip does on chip
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infrared suppression (1 means perform on chip suppression) */
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return sprintf(buf, "%d\n", chip->prox_scheme);
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}
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static ssize_t store_prox_infrared_suppression(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct isl29018_chip *chip = iio_priv(indio_dev);
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unsigned long lval;
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if (strict_strtoul(buf, 10, &lval))
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return -EINVAL;
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if (!(lval == 0UL || lval == 1UL)) {
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dev_err(dev, "The mode is not supported\n");
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return -EINVAL;
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}
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/* get the "proximity scheme" i.e. if the chip does on chip
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infrared suppression (1 means perform on chip suppression) */
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mutex_lock(&chip->lock);
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chip->prox_scheme = (int)lval;
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mutex_unlock(&chip->lock);
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return count;
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}
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/* Channel IO */
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static int isl29018_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val,
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int val2,
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long mask)
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{
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struct isl29018_chip *chip = iio_priv(indio_dev);
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int ret = -EINVAL;
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mutex_lock(&chip->lock);
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if (mask == IIO_CHAN_INFO_CALIBSCALE && chan->type == IIO_LIGHT) {
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chip->lux_scale = val;
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/* With no write_raw_get_fmt(), val2 is a MICRO fraction. */
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chip->lux_uscale = val2;
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ret = 0;
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}
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mutex_unlock(&chip->lock);
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return ret;
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}
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static int isl29018_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val,
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int *val2,
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long mask)
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{
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int ret = -EINVAL;
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struct isl29018_chip *chip = iio_priv(indio_dev);
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mutex_lock(&chip->lock);
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if (chip->suspended) {
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mutex_unlock(&chip->lock);
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return -EBUSY;
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}
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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case IIO_CHAN_INFO_PROCESSED:
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switch (chan->type) {
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case IIO_LIGHT:
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ret = isl29018_read_lux(chip, val);
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break;
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case IIO_INTENSITY:
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ret = isl29018_read_ir(chip, val);
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break;
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case IIO_PROXIMITY:
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ret = isl29018_read_proximity_ir(chip,
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chip->prox_scheme, val);
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break;
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default:
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break;
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}
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if (!ret)
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ret = IIO_VAL_INT;
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break;
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case IIO_CHAN_INFO_CALIBSCALE:
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if (chan->type == IIO_LIGHT) {
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*val = chip->lux_scale;
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*val2 = chip->lux_uscale;
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ret = IIO_VAL_INT_PLUS_MICRO;
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}
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break;
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default:
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break;
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}
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mutex_unlock(&chip->lock);
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return ret;
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}
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static const struct iio_chan_spec isl29018_channels[] = {
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{
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.type = IIO_LIGHT,
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.indexed = 1,
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.channel = 0,
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.info_mask = IIO_CHAN_INFO_PROCESSED_SEPARATE_BIT |
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IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT,
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}, {
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.type = IIO_INTENSITY,
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.modified = 1,
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.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
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.channel2 = IIO_MOD_LIGHT_IR,
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}, {
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/* Unindexed in current ABI. But perhaps it should be. */
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.type = IIO_PROXIMITY,
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.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
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}
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};
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static IIO_DEVICE_ATTR(range, S_IRUGO | S_IWUSR, show_range, store_range, 0);
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static IIO_CONST_ATTR(range_available, "1000 4000 16000 64000");
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static IIO_CONST_ATTR(adc_resolution_available, "4 8 12 16");
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static IIO_DEVICE_ATTR(adc_resolution, S_IRUGO | S_IWUSR,
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show_resolution, store_resolution, 0);
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static IIO_DEVICE_ATTR(proximity_on_chip_ambient_infrared_suppression,
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S_IRUGO | S_IWUSR,
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show_prox_infrared_suppression,
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store_prox_infrared_suppression, 0);
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#define ISL29018_DEV_ATTR(name) (&iio_dev_attr_##name.dev_attr.attr)
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#define ISL29018_CONST_ATTR(name) (&iio_const_attr_##name.dev_attr.attr)
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static struct attribute *isl29018_attributes[] = {
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ISL29018_DEV_ATTR(range),
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ISL29018_CONST_ATTR(range_available),
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ISL29018_DEV_ATTR(adc_resolution),
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ISL29018_CONST_ATTR(adc_resolution_available),
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ISL29018_DEV_ATTR(proximity_on_chip_ambient_infrared_suppression),
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NULL
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};
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static const struct attribute_group isl29108_group = {
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.attrs = isl29018_attributes,
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};
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static int isl29018_chip_init(struct isl29018_chip *chip)
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{
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int status;
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int new_adc_bit;
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unsigned int new_range;
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/* Code added per Intersil Application Note 1534:
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* When VDD sinks to approximately 1.8V or below, some of
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* the part's registers may change their state. When VDD
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* recovers to 2.25V (or greater), the part may thus be in an
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* unknown mode of operation. The user can return the part to
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* a known mode of operation either by (a) setting VDD = 0V for
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* 1 second or more and then powering back up with a slew rate
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* of 0.5V/ms or greater, or (b) via I2C disable all ALS/PROX
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* conversions, clear the test registers, and then rewrite all
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* registers to the desired values.
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* ...
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* FOR ISL29011, ISL29018, ISL29021, ISL29023
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* 1. Write 0x00 to register 0x08 (TEST)
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* 2. Write 0x00 to register 0x00 (CMD1)
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* 3. Rewrite all registers to the desired values
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*
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* ISL29018 Data Sheet (FN6619.1, Feb 11, 2010) essentially says
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* the same thing EXCEPT the data sheet asks for a 1ms delay after
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* writing the CMD1 register.
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*/
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status = regmap_write(chip->regmap, ISL29018_REG_TEST, 0x0);
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if (status < 0) {
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dev_err(chip->dev, "Failed to clear isl29018 TEST reg."
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"(%d)\n", status);
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return status;
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}
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/* See Intersil AN1534 comments above.
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* "Operating Mode" (COMMAND1) register is reprogrammed when
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* data is read from the device.
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*/
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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;
|
|
}
|
|
|
|
static const struct iio_info isl29108_info = {
|
|
.attrs = &isl29108_group,
|
|
.driver_module = THIS_MODULE,
|
|
.read_raw = &isl29018_read_raw,
|
|
.write_raw = &isl29018_write_raw,
|
|
};
|
|
|
|
static bool is_volatile_reg(struct device *dev, unsigned int reg)
|
|
{
|
|
switch (reg) {
|
|
case ISL29018_REG_ADD_DATA_LSB:
|
|
case ISL29018_REG_ADD_DATA_MSB:
|
|
case ISL29018_REG_ADD_COMMAND1:
|
|
case ISL29018_REG_TEST:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* isl29018_regmap_config: regmap configuration.
|
|
* Use RBTREE mechanism for caching.
|
|
*/
|
|
static const struct regmap_config isl29018_regmap_config = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
.volatile_reg = is_volatile_reg,
|
|
.max_register = ISL29018_REG_TEST,
|
|
.num_reg_defaults_raw = ISL29018_REG_TEST + 1,
|
|
.cache_type = REGCACHE_RBTREE,
|
|
};
|
|
|
|
static int isl29018_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct isl29018_chip *chip;
|
|
struct iio_dev *indio_dev;
|
|
int err;
|
|
|
|
indio_dev = iio_device_alloc(sizeof(*chip));
|
|
if (indio_dev == NULL) {
|
|
dev_err(&client->dev, "iio allocation fails\n");
|
|
err = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
chip = iio_priv(indio_dev);
|
|
|
|
i2c_set_clientdata(client, indio_dev);
|
|
chip->dev = &client->dev;
|
|
|
|
mutex_init(&chip->lock);
|
|
|
|
chip->lux_scale = 1;
|
|
chip->range = 1000;
|
|
chip->adc_bit = 16;
|
|
chip->suspended = false;
|
|
|
|
chip->regmap = devm_regmap_init_i2c(client, &isl29018_regmap_config);
|
|
if (IS_ERR(chip->regmap)) {
|
|
err = PTR_ERR(chip->regmap);
|
|
dev_err(chip->dev, "regmap initialization failed: %d\n", err);
|
|
goto exit;
|
|
}
|
|
|
|
err = isl29018_chip_init(chip);
|
|
if (err)
|
|
goto exit_iio_free;
|
|
|
|
indio_dev->info = &isl29108_info;
|
|
indio_dev->channels = isl29018_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(isl29018_channels);
|
|
indio_dev->name = id->name;
|
|
indio_dev->dev.parent = &client->dev;
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
err = iio_device_register(indio_dev);
|
|
if (err) {
|
|
dev_err(&client->dev, "iio registration fails\n");
|
|
goto exit_iio_free;
|
|
}
|
|
|
|
return 0;
|
|
exit_iio_free:
|
|
iio_device_free(indio_dev);
|
|
exit:
|
|
return err;
|
|
}
|
|
|
|
static int isl29018_remove(struct i2c_client *client)
|
|
{
|
|
struct iio_dev *indio_dev = i2c_get_clientdata(client);
|
|
|
|
dev_dbg(&client->dev, "%s()\n", __func__);
|
|
iio_device_unregister(indio_dev);
|
|
iio_device_free(indio_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int isl29018_suspend(struct device *dev)
|
|
{
|
|
struct isl29018_chip *chip = iio_priv(dev_get_drvdata(dev));
|
|
|
|
mutex_lock(&chip->lock);
|
|
|
|
/* Since this driver uses only polling commands, we are by default in
|
|
* auto shutdown (ie, power-down) mode.
|
|
* So we do not have much to do here.
|
|
*/
|
|
chip->suspended = true;
|
|
|
|
mutex_unlock(&chip->lock);
|
|
return 0;
|
|
}
|
|
|
|
static int isl29018_resume(struct device *dev)
|
|
{
|
|
struct isl29018_chip *chip = iio_priv(dev_get_drvdata(dev));
|
|
int err;
|
|
|
|
mutex_lock(&chip->lock);
|
|
|
|
err = isl29018_chip_init(chip);
|
|
if (!err)
|
|
chip->suspended = false;
|
|
|
|
mutex_unlock(&chip->lock);
|
|
return err;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(isl29018_pm_ops, isl29018_suspend, isl29018_resume);
|
|
#define ISL29018_PM_OPS (&isl29018_pm_ops)
|
|
#else
|
|
#define ISL29018_PM_OPS NULL
|
|
#endif
|
|
|
|
static const struct i2c_device_id isl29018_id[] = {
|
|
{"isl29018", 0},
|
|
{}
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, isl29018_id);
|
|
|
|
static const struct of_device_id isl29018_of_match[] = {
|
|
{ .compatible = "isil,isl29018", },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, isl29018_of_match);
|
|
|
|
static struct i2c_driver isl29018_driver = {
|
|
.class = I2C_CLASS_HWMON,
|
|
.driver = {
|
|
.name = "isl29018",
|
|
.pm = ISL29018_PM_OPS,
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = isl29018_of_match,
|
|
},
|
|
.probe = isl29018_probe,
|
|
.remove = isl29018_remove,
|
|
.id_table = isl29018_id,
|
|
};
|
|
module_i2c_driver(isl29018_driver);
|
|
|
|
MODULE_DESCRIPTION("ISL29018 Ambient Light Sensor driver");
|
|
MODULE_LICENSE("GPL");
|