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639 lines
17 KiB
639 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* MAX44000 Ambient and Infrared Proximity Sensor |
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* |
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* Copyright (c) 2016, Intel Corporation. |
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* |
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* Data sheet: https://datasheets.maximintegrated.com/en/ds/MAX44000.pdf |
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* |
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* 7-bit I2C slave address 0x4a |
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*/ |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/i2c.h> |
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#include <linux/regmap.h> |
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#include <linux/util_macros.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/sysfs.h> |
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#include <linux/iio/buffer.h> |
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#include <linux/iio/trigger_consumer.h> |
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#include <linux/iio/triggered_buffer.h> |
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#include <linux/acpi.h> |
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#define MAX44000_DRV_NAME "max44000" |
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/* Registers in datasheet order */ |
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#define MAX44000_REG_STATUS 0x00 |
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#define MAX44000_REG_CFG_MAIN 0x01 |
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#define MAX44000_REG_CFG_RX 0x02 |
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#define MAX44000_REG_CFG_TX 0x03 |
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#define MAX44000_REG_ALS_DATA_HI 0x04 |
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#define MAX44000_REG_ALS_DATA_LO 0x05 |
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#define MAX44000_REG_PRX_DATA 0x16 |
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#define MAX44000_REG_ALS_UPTHR_HI 0x06 |
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#define MAX44000_REG_ALS_UPTHR_LO 0x07 |
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#define MAX44000_REG_ALS_LOTHR_HI 0x08 |
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#define MAX44000_REG_ALS_LOTHR_LO 0x09 |
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#define MAX44000_REG_PST 0x0a |
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#define MAX44000_REG_PRX_IND 0x0b |
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#define MAX44000_REG_PRX_THR 0x0c |
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#define MAX44000_REG_TRIM_GAIN_GREEN 0x0f |
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#define MAX44000_REG_TRIM_GAIN_IR 0x10 |
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/* REG_CFG bits */ |
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#define MAX44000_CFG_ALSINTE 0x01 |
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#define MAX44000_CFG_PRXINTE 0x02 |
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#define MAX44000_CFG_MASK 0x1c |
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#define MAX44000_CFG_MODE_SHUTDOWN 0x00 |
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#define MAX44000_CFG_MODE_ALS_GIR 0x04 |
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#define MAX44000_CFG_MODE_ALS_G 0x08 |
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#define MAX44000_CFG_MODE_ALS_IR 0x0c |
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#define MAX44000_CFG_MODE_ALS_PRX 0x10 |
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#define MAX44000_CFG_MODE_PRX 0x14 |
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#define MAX44000_CFG_TRIM 0x20 |
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/* |
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* Upper 4 bits are not documented but start as 1 on powerup |
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* Setting them to 0 causes proximity to misbehave so set them to 1 |
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*/ |
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#define MAX44000_REG_CFG_RX_DEFAULT 0xf0 |
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/* REG_RX bits */ |
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#define MAX44000_CFG_RX_ALSTIM_MASK 0x0c |
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#define MAX44000_CFG_RX_ALSTIM_SHIFT 2 |
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#define MAX44000_CFG_RX_ALSPGA_MASK 0x03 |
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#define MAX44000_CFG_RX_ALSPGA_SHIFT 0 |
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/* REG_TX bits */ |
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#define MAX44000_LED_CURRENT_MASK 0xf |
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#define MAX44000_LED_CURRENT_MAX 11 |
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#define MAX44000_LED_CURRENT_DEFAULT 6 |
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#define MAX44000_ALSDATA_OVERFLOW 0x4000 |
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struct max44000_data { |
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struct mutex lock; |
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struct regmap *regmap; |
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/* Ensure naturally aligned timestamp */ |
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struct { |
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u16 channels[2]; |
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s64 ts __aligned(8); |
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} scan; |
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}; |
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/* Default scale is set to the minimum of 0.03125 or 1 / (1 << 5) lux */ |
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#define MAX44000_ALS_TO_LUX_DEFAULT_FRACTION_LOG2 5 |
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/* Scale can be multiplied by up to 128x via ALSPGA for measurement gain */ |
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static const int max44000_alspga_shift[] = {0, 2, 4, 7}; |
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#define MAX44000_ALSPGA_MAX_SHIFT 7 |
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/* |
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* Scale can be multiplied by up to 64x via ALSTIM because of lost resolution |
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* |
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* This scaling factor is hidden from userspace and instead accounted for when |
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* reading raw values from the device. |
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* |
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* This makes it possible to cleanly expose ALSPGA as IIO_CHAN_INFO_SCALE and |
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* ALSTIM as IIO_CHAN_INFO_INT_TIME without the values affecting each other. |
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* |
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* Handling this internally is also required for buffer support because the |
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* channel's scan_type can't be modified dynamically. |
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*/ |
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#define MAX44000_ALSTIM_SHIFT(alstim) (2 * (alstim)) |
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|
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/* Available integration times with pretty manual alignment: */ |
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static const int max44000_int_time_avail_ns_array[] = { |
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100000000, |
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25000000, |
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6250000, |
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1562500, |
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}; |
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static const char max44000_int_time_avail_str[] = |
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"0.100 " |
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"0.025 " |
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"0.00625 " |
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"0.0015625"; |
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/* Available scales (internal to ulux) with pretty manual alignment: */ |
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static const int max44000_scale_avail_ulux_array[] = { |
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31250, |
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125000, |
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500000, |
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4000000, |
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}; |
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static const char max44000_scale_avail_str[] = |
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"0.03125 " |
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"0.125 " |
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"0.5 " |
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"4"; |
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#define MAX44000_SCAN_INDEX_ALS 0 |
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#define MAX44000_SCAN_INDEX_PRX 1 |
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static const struct iio_chan_spec max44000_channels[] = { |
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{ |
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.type = IIO_LIGHT, |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | |
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BIT(IIO_CHAN_INFO_INT_TIME), |
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.scan_index = MAX44000_SCAN_INDEX_ALS, |
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.scan_type = { |
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.sign = 'u', |
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.realbits = 14, |
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.storagebits = 16, |
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} |
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}, |
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{ |
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.type = IIO_PROXIMITY, |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
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.scan_index = MAX44000_SCAN_INDEX_PRX, |
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.scan_type = { |
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.sign = 'u', |
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.realbits = 8, |
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.storagebits = 16, |
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} |
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}, |
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IIO_CHAN_SOFT_TIMESTAMP(2), |
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{ |
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.type = IIO_CURRENT, |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | |
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BIT(IIO_CHAN_INFO_SCALE), |
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.extend_name = "led", |
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.output = 1, |
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.scan_index = -1, |
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}, |
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}; |
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static int max44000_read_alstim(struct max44000_data *data) |
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{ |
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unsigned int val; |
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int ret; |
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ret = regmap_read(data->regmap, MAX44000_REG_CFG_RX, &val); |
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if (ret < 0) |
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return ret; |
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return (val & MAX44000_CFG_RX_ALSTIM_MASK) >> MAX44000_CFG_RX_ALSTIM_SHIFT; |
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} |
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static int max44000_write_alstim(struct max44000_data *data, int val) |
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{ |
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return regmap_write_bits(data->regmap, MAX44000_REG_CFG_RX, |
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MAX44000_CFG_RX_ALSTIM_MASK, |
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val << MAX44000_CFG_RX_ALSTIM_SHIFT); |
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} |
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static int max44000_read_alspga(struct max44000_data *data) |
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{ |
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unsigned int val; |
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int ret; |
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ret = regmap_read(data->regmap, MAX44000_REG_CFG_RX, &val); |
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if (ret < 0) |
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return ret; |
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return (val & MAX44000_CFG_RX_ALSPGA_MASK) >> MAX44000_CFG_RX_ALSPGA_SHIFT; |
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} |
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static int max44000_write_alspga(struct max44000_data *data, int val) |
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{ |
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return regmap_write_bits(data->regmap, MAX44000_REG_CFG_RX, |
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MAX44000_CFG_RX_ALSPGA_MASK, |
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val << MAX44000_CFG_RX_ALSPGA_SHIFT); |
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} |
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static int max44000_read_alsval(struct max44000_data *data) |
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{ |
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u16 regval; |
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__be16 val; |
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int alstim, ret; |
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ret = regmap_bulk_read(data->regmap, MAX44000_REG_ALS_DATA_HI, |
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&val, sizeof(val)); |
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if (ret < 0) |
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return ret; |
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alstim = ret = max44000_read_alstim(data); |
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if (ret < 0) |
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return ret; |
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regval = be16_to_cpu(val); |
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/* |
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* Overflow is explained on datasheet page 17. |
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* |
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* It's a warning that either the G or IR channel has become saturated |
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* and that the value in the register is likely incorrect. |
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* |
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* The recommendation is to change the scale (ALSPGA). |
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* The driver just returns the max representable value. |
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*/ |
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if (regval & MAX44000_ALSDATA_OVERFLOW) |
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return 0x3FFF; |
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return regval << MAX44000_ALSTIM_SHIFT(alstim); |
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} |
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static int max44000_write_led_current_raw(struct max44000_data *data, int val) |
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{ |
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/* Maybe we should clamp the value instead? */ |
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if (val < 0 || val > MAX44000_LED_CURRENT_MAX) |
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return -ERANGE; |
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if (val >= 8) |
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val += 4; |
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return regmap_write_bits(data->regmap, MAX44000_REG_CFG_TX, |
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MAX44000_LED_CURRENT_MASK, val); |
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} |
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static int max44000_read_led_current_raw(struct max44000_data *data) |
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{ |
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unsigned int regval; |
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int ret; |
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ret = regmap_read(data->regmap, MAX44000_REG_CFG_TX, ®val); |
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if (ret < 0) |
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return ret; |
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regval &= MAX44000_LED_CURRENT_MASK; |
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if (regval >= 8) |
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regval -= 4; |
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return regval; |
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} |
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static int max44000_read_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int *val, int *val2, long mask) |
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{ |
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struct max44000_data *data = iio_priv(indio_dev); |
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int alstim, alspga; |
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unsigned int regval; |
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int ret; |
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switch (mask) { |
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case IIO_CHAN_INFO_RAW: |
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switch (chan->type) { |
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case IIO_LIGHT: |
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mutex_lock(&data->lock); |
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ret = max44000_read_alsval(data); |
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mutex_unlock(&data->lock); |
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if (ret < 0) |
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return ret; |
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*val = ret; |
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return IIO_VAL_INT; |
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case IIO_PROXIMITY: |
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mutex_lock(&data->lock); |
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ret = regmap_read(data->regmap, MAX44000_REG_PRX_DATA, ®val); |
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mutex_unlock(&data->lock); |
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if (ret < 0) |
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return ret; |
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*val = regval; |
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return IIO_VAL_INT; |
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case IIO_CURRENT: |
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mutex_lock(&data->lock); |
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ret = max44000_read_led_current_raw(data); |
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mutex_unlock(&data->lock); |
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if (ret < 0) |
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return ret; |
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*val = ret; |
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return IIO_VAL_INT; |
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default: |
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return -EINVAL; |
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} |
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case IIO_CHAN_INFO_SCALE: |
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switch (chan->type) { |
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case IIO_CURRENT: |
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/* Output register is in 10s of miliamps */ |
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*val = 10; |
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return IIO_VAL_INT; |
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case IIO_LIGHT: |
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mutex_lock(&data->lock); |
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alspga = ret = max44000_read_alspga(data); |
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mutex_unlock(&data->lock); |
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if (ret < 0) |
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return ret; |
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/* Avoid negative shifts */ |
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*val = (1 << MAX44000_ALSPGA_MAX_SHIFT); |
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*val2 = MAX44000_ALS_TO_LUX_DEFAULT_FRACTION_LOG2 |
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+ MAX44000_ALSPGA_MAX_SHIFT |
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- max44000_alspga_shift[alspga]; |
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return IIO_VAL_FRACTIONAL_LOG2; |
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default: |
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return -EINVAL; |
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} |
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case IIO_CHAN_INFO_INT_TIME: |
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mutex_lock(&data->lock); |
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alstim = ret = max44000_read_alstim(data); |
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mutex_unlock(&data->lock); |
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if (ret < 0) |
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return ret; |
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*val = 0; |
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*val2 = max44000_int_time_avail_ns_array[alstim]; |
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return IIO_VAL_INT_PLUS_NANO; |
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default: |
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return -EINVAL; |
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} |
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} |
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static int max44000_write_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int val, int val2, long mask) |
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{ |
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struct max44000_data *data = iio_priv(indio_dev); |
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int ret; |
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if (mask == IIO_CHAN_INFO_RAW && chan->type == IIO_CURRENT) { |
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mutex_lock(&data->lock); |
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ret = max44000_write_led_current_raw(data, val); |
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mutex_unlock(&data->lock); |
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return ret; |
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} else if (mask == IIO_CHAN_INFO_INT_TIME && chan->type == IIO_LIGHT) { |
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s64 valns = val * NSEC_PER_SEC + val2; |
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int alstim = find_closest_descending(valns, |
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max44000_int_time_avail_ns_array, |
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ARRAY_SIZE(max44000_int_time_avail_ns_array)); |
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mutex_lock(&data->lock); |
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ret = max44000_write_alstim(data, alstim); |
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mutex_unlock(&data->lock); |
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return ret; |
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} else if (mask == IIO_CHAN_INFO_SCALE && chan->type == IIO_LIGHT) { |
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s64 valus = val * USEC_PER_SEC + val2; |
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int alspga = find_closest(valus, |
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max44000_scale_avail_ulux_array, |
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ARRAY_SIZE(max44000_scale_avail_ulux_array)); |
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mutex_lock(&data->lock); |
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ret = max44000_write_alspga(data, alspga); |
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mutex_unlock(&data->lock); |
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return ret; |
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} |
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return -EINVAL; |
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} |
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static int max44000_write_raw_get_fmt(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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long mask) |
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{ |
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if (mask == IIO_CHAN_INFO_INT_TIME && chan->type == IIO_LIGHT) |
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return IIO_VAL_INT_PLUS_NANO; |
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else if (mask == IIO_CHAN_INFO_SCALE && chan->type == IIO_LIGHT) |
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return IIO_VAL_INT_PLUS_MICRO; |
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else |
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return IIO_VAL_INT; |
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} |
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static IIO_CONST_ATTR(illuminance_integration_time_available, max44000_int_time_avail_str); |
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static IIO_CONST_ATTR(illuminance_scale_available, max44000_scale_avail_str); |
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static struct attribute *max44000_attributes[] = { |
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&iio_const_attr_illuminance_integration_time_available.dev_attr.attr, |
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&iio_const_attr_illuminance_scale_available.dev_attr.attr, |
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NULL |
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}; |
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static const struct attribute_group max44000_attribute_group = { |
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.attrs = max44000_attributes, |
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}; |
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static const struct iio_info max44000_info = { |
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.read_raw = max44000_read_raw, |
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.write_raw = max44000_write_raw, |
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.write_raw_get_fmt = max44000_write_raw_get_fmt, |
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.attrs = &max44000_attribute_group, |
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}; |
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static bool max44000_readable_reg(struct device *dev, unsigned int reg) |
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{ |
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switch (reg) { |
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case MAX44000_REG_STATUS: |
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case MAX44000_REG_CFG_MAIN: |
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case MAX44000_REG_CFG_RX: |
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case MAX44000_REG_CFG_TX: |
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case MAX44000_REG_ALS_DATA_HI: |
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case MAX44000_REG_ALS_DATA_LO: |
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case MAX44000_REG_PRX_DATA: |
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case MAX44000_REG_ALS_UPTHR_HI: |
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case MAX44000_REG_ALS_UPTHR_LO: |
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case MAX44000_REG_ALS_LOTHR_HI: |
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case MAX44000_REG_ALS_LOTHR_LO: |
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case MAX44000_REG_PST: |
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case MAX44000_REG_PRX_IND: |
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case MAX44000_REG_PRX_THR: |
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case MAX44000_REG_TRIM_GAIN_GREEN: |
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case MAX44000_REG_TRIM_GAIN_IR: |
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return true; |
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default: |
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return false; |
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} |
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} |
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static bool max44000_writeable_reg(struct device *dev, unsigned int reg) |
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{ |
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switch (reg) { |
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case MAX44000_REG_CFG_MAIN: |
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case MAX44000_REG_CFG_RX: |
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case MAX44000_REG_CFG_TX: |
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case MAX44000_REG_ALS_UPTHR_HI: |
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case MAX44000_REG_ALS_UPTHR_LO: |
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case MAX44000_REG_ALS_LOTHR_HI: |
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case MAX44000_REG_ALS_LOTHR_LO: |
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case MAX44000_REG_PST: |
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case MAX44000_REG_PRX_IND: |
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case MAX44000_REG_PRX_THR: |
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case MAX44000_REG_TRIM_GAIN_GREEN: |
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case MAX44000_REG_TRIM_GAIN_IR: |
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return true; |
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default: |
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return false; |
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} |
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} |
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static bool max44000_volatile_reg(struct device *dev, unsigned int reg) |
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{ |
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switch (reg) { |
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case MAX44000_REG_STATUS: |
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case MAX44000_REG_ALS_DATA_HI: |
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case MAX44000_REG_ALS_DATA_LO: |
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case MAX44000_REG_PRX_DATA: |
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return true; |
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default: |
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return false; |
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} |
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} |
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static bool max44000_precious_reg(struct device *dev, unsigned int reg) |
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{ |
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return reg == MAX44000_REG_STATUS; |
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} |
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static const struct regmap_config max44000_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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|
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.max_register = MAX44000_REG_PRX_DATA, |
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.readable_reg = max44000_readable_reg, |
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.writeable_reg = max44000_writeable_reg, |
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.volatile_reg = max44000_volatile_reg, |
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.precious_reg = max44000_precious_reg, |
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|
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.use_single_read = true, |
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.use_single_write = true, |
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.cache_type = REGCACHE_RBTREE, |
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}; |
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|
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static irqreturn_t max44000_trigger_handler(int irq, void *p) |
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{ |
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struct iio_poll_func *pf = p; |
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struct iio_dev *indio_dev = pf->indio_dev; |
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struct max44000_data *data = iio_priv(indio_dev); |
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int index = 0; |
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unsigned int regval; |
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int ret; |
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|
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mutex_lock(&data->lock); |
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if (test_bit(MAX44000_SCAN_INDEX_ALS, indio_dev->active_scan_mask)) { |
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ret = max44000_read_alsval(data); |
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if (ret < 0) |
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goto out_unlock; |
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data->scan.channels[index++] = ret; |
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} |
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if (test_bit(MAX44000_SCAN_INDEX_PRX, indio_dev->active_scan_mask)) { |
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ret = regmap_read(data->regmap, MAX44000_REG_PRX_DATA, ®val); |
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if (ret < 0) |
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goto out_unlock; |
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data->scan.channels[index] = regval; |
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} |
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mutex_unlock(&data->lock); |
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|
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iio_push_to_buffers_with_timestamp(indio_dev, &data->scan, |
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iio_get_time_ns(indio_dev)); |
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iio_trigger_notify_done(indio_dev->trig); |
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return IRQ_HANDLED; |
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out_unlock: |
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mutex_unlock(&data->lock); |
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iio_trigger_notify_done(indio_dev->trig); |
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return IRQ_HANDLED; |
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} |
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static int max44000_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct max44000_data *data; |
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struct iio_dev *indio_dev; |
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int ret, reg; |
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|
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); |
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if (!indio_dev) |
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return -ENOMEM; |
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data = iio_priv(indio_dev); |
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data->regmap = devm_regmap_init_i2c(client, &max44000_regmap_config); |
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if (IS_ERR(data->regmap)) { |
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dev_err(&client->dev, "regmap_init failed!\n"); |
|
return PTR_ERR(data->regmap); |
|
} |
|
|
|
i2c_set_clientdata(client, indio_dev); |
|
mutex_init(&data->lock); |
|
indio_dev->info = &max44000_info; |
|
indio_dev->name = MAX44000_DRV_NAME; |
|
indio_dev->channels = max44000_channels; |
|
indio_dev->num_channels = ARRAY_SIZE(max44000_channels); |
|
|
|
/* |
|
* The device doesn't have a reset function so we just clear some |
|
* important bits at probe time to ensure sane operation. |
|
* |
|
* Since we don't support interrupts/events the threshold values are |
|
* not important. We also don't touch trim values. |
|
*/ |
|
|
|
/* Reset ALS scaling bits */ |
|
ret = regmap_write(data->regmap, MAX44000_REG_CFG_RX, |
|
MAX44000_REG_CFG_RX_DEFAULT); |
|
if (ret < 0) { |
|
dev_err(&client->dev, "failed to write default CFG_RX: %d\n", |
|
ret); |
|
return ret; |
|
} |
|
|
|
/* |
|
* By default the LED pulse used for the proximity sensor is disabled. |
|
* Set a middle value so that we get some sort of valid data by default. |
|
*/ |
|
ret = max44000_write_led_current_raw(data, MAX44000_LED_CURRENT_DEFAULT); |
|
if (ret < 0) { |
|
dev_err(&client->dev, "failed to write init config: %d\n", ret); |
|
return ret; |
|
} |
|
|
|
/* Reset CFG bits to ALS_PRX mode which allows easy reading of both values. */ |
|
reg = MAX44000_CFG_TRIM | MAX44000_CFG_MODE_ALS_PRX; |
|
ret = regmap_write(data->regmap, MAX44000_REG_CFG_MAIN, reg); |
|
if (ret < 0) { |
|
dev_err(&client->dev, "failed to write init config: %d\n", ret); |
|
return ret; |
|
} |
|
|
|
/* Read status at least once to clear any stale interrupt bits. */ |
|
ret = regmap_read(data->regmap, MAX44000_REG_STATUS, ®); |
|
if (ret < 0) { |
|
dev_err(&client->dev, "failed to read init status: %d\n", ret); |
|
return ret; |
|
} |
|
|
|
ret = iio_triggered_buffer_setup(indio_dev, NULL, max44000_trigger_handler, NULL); |
|
if (ret < 0) { |
|
dev_err(&client->dev, "iio triggered buffer setup failed\n"); |
|
return ret; |
|
} |
|
|
|
return iio_device_register(indio_dev); |
|
} |
|
|
|
static int max44000_remove(struct i2c_client *client) |
|
{ |
|
struct iio_dev *indio_dev = i2c_get_clientdata(client); |
|
|
|
iio_device_unregister(indio_dev); |
|
iio_triggered_buffer_cleanup(indio_dev); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct i2c_device_id max44000_id[] = { |
|
{"max44000", 0}, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(i2c, max44000_id); |
|
|
|
#ifdef CONFIG_ACPI |
|
static const struct acpi_device_id max44000_acpi_match[] = { |
|
{"MAX44000", 0}, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(acpi, max44000_acpi_match); |
|
#endif |
|
|
|
static struct i2c_driver max44000_driver = { |
|
.driver = { |
|
.name = MAX44000_DRV_NAME, |
|
.acpi_match_table = ACPI_PTR(max44000_acpi_match), |
|
}, |
|
.probe = max44000_probe, |
|
.remove = max44000_remove, |
|
.id_table = max44000_id, |
|
}; |
|
|
|
module_i2c_driver(max44000_driver); |
|
|
|
MODULE_AUTHOR("Crestez Dan Leonard <[email protected]>"); |
|
MODULE_DESCRIPTION("MAX44000 Ambient and Infrared Proximity Sensor"); |
|
MODULE_LICENSE("GPL v2");
|
|
|