628 lines
16 KiB
C
628 lines
16 KiB
C
// 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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/* 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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.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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.use_single_read = true,
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.use_single_write = true,
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.cache_type = REGCACHE_RBTREE,
|
|
};
|
|
|
|
static irqreturn_t max44000_trigger_handler(int irq, void *p)
|
|
{
|
|
struct iio_poll_func *pf = p;
|
|
struct iio_dev *indio_dev = pf->indio_dev;
|
|
struct max44000_data *data = iio_priv(indio_dev);
|
|
int index = 0;
|
|
unsigned int regval;
|
|
int ret;
|
|
|
|
mutex_lock(&data->lock);
|
|
if (test_bit(MAX44000_SCAN_INDEX_ALS, indio_dev->active_scan_mask)) {
|
|
ret = max44000_read_alsval(data);
|
|
if (ret < 0)
|
|
goto out_unlock;
|
|
data->scan.channels[index++] = ret;
|
|
}
|
|
if (test_bit(MAX44000_SCAN_INDEX_PRX, indio_dev->active_scan_mask)) {
|
|
ret = regmap_read(data->regmap, MAX44000_REG_PRX_DATA, ®val);
|
|
if (ret < 0)
|
|
goto out_unlock;
|
|
data->scan.channels[index] = regval;
|
|
}
|
|
mutex_unlock(&data->lock);
|
|
|
|
iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
|
|
iio_get_time_ns(indio_dev));
|
|
iio_trigger_notify_done(indio_dev->trig);
|
|
return IRQ_HANDLED;
|
|
|
|
out_unlock:
|
|
mutex_unlock(&data->lock);
|
|
iio_trigger_notify_done(indio_dev->trig);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int max44000_probe(struct i2c_client *client)
|
|
{
|
|
struct max44000_data *data;
|
|
struct iio_dev *indio_dev;
|
|
int ret, reg;
|
|
|
|
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
|
|
if (!indio_dev)
|
|
return -ENOMEM;
|
|
data = iio_priv(indio_dev);
|
|
data->regmap = devm_regmap_init_i2c(client, &max44000_regmap_config);
|
|
if (IS_ERR(data->regmap)) {
|
|
dev_err(&client->dev, "regmap_init failed!\n");
|
|
return PTR_ERR(data->regmap);
|
|
}
|
|
|
|
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 = devm_iio_triggered_buffer_setup(&client->dev, indio_dev, NULL,
|
|
max44000_trigger_handler, NULL);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "iio triggered buffer setup failed\n");
|
|
return ret;
|
|
}
|
|
|
|
return devm_iio_device_register(&client->dev, indio_dev);
|
|
}
|
|
|
|
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,
|
|
.id_table = max44000_id,
|
|
};
|
|
|
|
module_i2c_driver(max44000_driver);
|
|
|
|
MODULE_AUTHOR("Crestez Dan Leonard <leonard.crestez@intel.com>");
|
|
MODULE_DESCRIPTION("MAX44000 Ambient and Infrared Proximity Sensor");
|
|
MODULE_LICENSE("GPL v2");
|