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![Christian Eggers](/assets/img/avatar_default.png)
We found some sensors which are much slower (20% at room temperature)
than nominal. According to the data sheet, up to 27% is possible. Now I
add 33% to the nominal time out, hopefully this is enough.
Signed-off-by: Christian Eggers <ceggers@arri.de>
Link: https://lore.kernel.org/r/20200909154439.10308-1-ceggers@arri.de
Fixes: 403e5586b5
("iio: light: as73211: New driver")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
800 lines
21 KiB
C
800 lines
21 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Support for AMS AS73211 JENCOLOR(R) Digital XYZ Sensor
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*
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* Author: Christian Eggers <ceggers@arri.de>
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*
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* Copyright (c) 2020 ARRI Lighting
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*
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* Color light sensor with 16-bit channels for x, y, z and temperature);
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* 7-bit I2C slave address 0x74 .. 0x77.
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*
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* Datasheet: https://ams.com/documents/20143/36005/AS73211_DS000556_3-01.pdf
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*/
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#include <linux/bitfield.h>
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#include <linux/completion.h>
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/iio/buffer.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/trigger_consumer.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/pm.h>
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#define HZ_PER_KHZ 1000
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#define AS73211_DRV_NAME "as73211"
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/* AS73211 configuration registers */
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#define AS73211_REG_OSR 0x0
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#define AS73211_REG_AGEN 0x2
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#define AS73211_REG_CREG1 0x6
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#define AS73211_REG_CREG2 0x7
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#define AS73211_REG_CREG3 0x8
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/* AS73211 output register bank */
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#define AS73211_OUT_OSR_STATUS 0
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#define AS73211_OUT_TEMP 1
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#define AS73211_OUT_MRES1 2
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#define AS73211_OUT_MRES2 3
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#define AS73211_OUT_MRES3 4
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#define AS73211_OSR_SS BIT(7)
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#define AS73211_OSR_PD BIT(6)
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#define AS73211_OSR_SW_RES BIT(3)
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#define AS73211_OSR_DOS_MASK GENMASK(2, 0)
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#define AS73211_OSR_DOS_CONFIG FIELD_PREP(AS73211_OSR_DOS_MASK, 0x2)
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#define AS73211_OSR_DOS_MEASURE FIELD_PREP(AS73211_OSR_DOS_MASK, 0x3)
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#define AS73211_AGEN_DEVID_MASK GENMASK(7, 4)
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#define AS73211_AGEN_DEVID(x) FIELD_PREP(AS73211_AGEN_DEVID_MASK, (x))
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#define AS73211_AGEN_MUT_MASK GENMASK(3, 0)
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#define AS73211_AGEN_MUT(x) FIELD_PREP(AS73211_AGEN_MUT_MASK, (x))
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#define AS73211_CREG1_GAIN_MASK GENMASK(7, 4)
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#define AS73211_CREG1_GAIN_1 11
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#define AS73211_CREG1_TIME_MASK GENMASK(3, 0)
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#define AS73211_CREG3_CCLK_MASK GENMASK(1, 0)
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#define AS73211_OSR_STATUS_OUTCONVOF BIT(15)
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#define AS73211_OSR_STATUS_MRESOF BIT(14)
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#define AS73211_OSR_STATUS_ADCOF BIT(13)
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#define AS73211_OSR_STATUS_LDATA BIT(12)
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#define AS73211_OSR_STATUS_NDATA BIT(11)
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#define AS73211_OSR_STATUS_NOTREADY BIT(10)
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#define AS73211_SAMPLE_FREQ_BASE 1024000
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#define AS73211_SAMPLE_TIME_NUM 15
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#define AS73211_SAMPLE_TIME_MAX_MS BIT(AS73211_SAMPLE_TIME_NUM - 1)
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/* Available sample frequencies are 1.024MHz multiplied by powers of two. */
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static const int as73211_samp_freq_avail[] = {
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AS73211_SAMPLE_FREQ_BASE * 1,
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AS73211_SAMPLE_FREQ_BASE * 2,
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AS73211_SAMPLE_FREQ_BASE * 4,
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AS73211_SAMPLE_FREQ_BASE * 8,
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};
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static const int as73211_hardwaregain_avail[] = {
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1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048,
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};
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/**
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* struct as73211_data - Instance data for one AS73211
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* @client: I2C client.
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* @osr: Cached Operational State Register.
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* @creg1: Cached Configuration Register 1.
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* @creg2: Cached Configuration Register 2.
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* @creg3: Cached Configuration Register 3.
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* @mutex: Keeps cached registers in sync with the device.
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* @completion: Completion to wait for interrupt.
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* @int_time_avail: Available integration times (depend on sampling frequency).
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*/
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struct as73211_data {
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struct i2c_client *client;
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u8 osr;
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u8 creg1;
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u8 creg2;
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u8 creg3;
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struct mutex mutex;
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struct completion completion;
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int int_time_avail[AS73211_SAMPLE_TIME_NUM * 2];
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};
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#define AS73211_COLOR_CHANNEL(_color, _si, _addr) { \
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.type = IIO_INTENSITY, \
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.modified = 1, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), \
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.info_mask_shared_by_type = \
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BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
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BIT(IIO_CHAN_INFO_HARDWAREGAIN) | \
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BIT(IIO_CHAN_INFO_INT_TIME), \
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.info_mask_shared_by_type_available = \
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BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
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BIT(IIO_CHAN_INFO_HARDWAREGAIN) | \
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BIT(IIO_CHAN_INFO_INT_TIME), \
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.channel2 = IIO_MOD_##_color, \
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.address = _addr, \
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.scan_index = _si, \
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.scan_type = { \
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.sign = 'u', \
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.realbits = 16, \
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.storagebits = 16, \
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.endianness = IIO_LE, \
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}, \
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}
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#define AS73211_OFFSET_TEMP_INT (-66)
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#define AS73211_OFFSET_TEMP_MICRO 900000
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#define AS73211_SCALE_TEMP_INT 0
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#define AS73211_SCALE_TEMP_MICRO 50000
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#define AS73211_SCALE_X 277071108 /* nW/m^2 */
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#define AS73211_SCALE_Y 298384270 /* nW/m^2 */
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#define AS73211_SCALE_Z 160241927 /* nW/m^2 */
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/* Channel order MUST match devices result register order */
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#define AS73211_SCAN_INDEX_TEMP 0
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#define AS73211_SCAN_INDEX_X 1
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#define AS73211_SCAN_INDEX_Y 2
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#define AS73211_SCAN_INDEX_Z 3
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#define AS73211_SCAN_INDEX_TS 4
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#define AS73211_SCAN_MASK_COLOR ( \
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BIT(AS73211_SCAN_INDEX_X) | \
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BIT(AS73211_SCAN_INDEX_Y) | \
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BIT(AS73211_SCAN_INDEX_Z))
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#define AS73211_SCAN_MASK_ALL ( \
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BIT(AS73211_SCAN_INDEX_TEMP) | \
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AS73211_SCAN_MASK_COLOR)
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static const struct iio_chan_spec as73211_channels[] = {
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{
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.type = IIO_TEMP,
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.info_mask_separate =
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BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_OFFSET) |
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BIT(IIO_CHAN_INFO_SCALE),
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.address = AS73211_OUT_TEMP,
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.scan_index = AS73211_SCAN_INDEX_TEMP,
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.scan_type = {
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.sign = 'u',
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.realbits = 16,
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.storagebits = 16,
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.endianness = IIO_LE,
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}
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},
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AS73211_COLOR_CHANNEL(X, AS73211_SCAN_INDEX_X, AS73211_OUT_MRES1),
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AS73211_COLOR_CHANNEL(Y, AS73211_SCAN_INDEX_Y, AS73211_OUT_MRES2),
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AS73211_COLOR_CHANNEL(Z, AS73211_SCAN_INDEX_Z, AS73211_OUT_MRES3),
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IIO_CHAN_SOFT_TIMESTAMP(AS73211_SCAN_INDEX_TS),
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};
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static unsigned int as73211_integration_time_1024cyc(struct as73211_data *data)
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{
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/*
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* Return integration time in units of 1024 clock cycles. Integration time
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* in CREG1 is in powers of 2 (x 1024 cycles).
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*/
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return BIT(FIELD_GET(AS73211_CREG1_TIME_MASK, data->creg1));
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}
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static unsigned int as73211_integration_time_us(struct as73211_data *data,
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unsigned int integration_time_1024cyc)
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{
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/*
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* f_samp is configured in CREG3 in powers of 2 (x 1.024 MHz)
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* t_cycl is configured in CREG1 in powers of 2 (x 1024 cycles)
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* t_int_us = 1 / (f_samp) * t_cycl * US_PER_SEC
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* = 1 / (2^CREG3_CCLK * 1,024,000) * 2^CREG1_CYCLES * 1,024 * US_PER_SEC
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* = 2^(-CREG3_CCLK) * 2^CREG1_CYCLES * 1,000
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* In order to get rid of negative exponents, we extend the "fraction"
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* by 2^3 (CREG3_CCLK,max = 3)
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* t_int_us = 2^(3-CREG3_CCLK) * 2^CREG1_CYCLES * 125
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*/
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return BIT(3 - FIELD_GET(AS73211_CREG3_CCLK_MASK, data->creg3)) *
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integration_time_1024cyc * 125;
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}
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static void as73211_integration_time_calc_avail(struct as73211_data *data)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(data->int_time_avail) / 2; i++) {
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unsigned int time_us = as73211_integration_time_us(data, BIT(i));
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data->int_time_avail[i * 2 + 0] = time_us / USEC_PER_SEC;
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data->int_time_avail[i * 2 + 1] = time_us % USEC_PER_SEC;
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}
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}
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static unsigned int as73211_gain(struct as73211_data *data)
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{
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/* gain can be calculated from CREG1 as 2^(11 - CREG1_GAIN) */
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return BIT(AS73211_CREG1_GAIN_1 - FIELD_GET(AS73211_CREG1_GAIN_MASK, data->creg1));
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}
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/* must be called with as73211_data::mutex held. */
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static int as73211_req_data(struct as73211_data *data)
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{
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unsigned int time_us = as73211_integration_time_us(data,
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as73211_integration_time_1024cyc(data));
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struct device *dev = &data->client->dev;
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union i2c_smbus_data smbus_data;
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u16 osr_status;
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int ret;
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if (data->client->irq)
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reinit_completion(&data->completion);
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/*
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* During measurement, there should be no traffic on the i2c bus as the
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* electrical noise would disturb the measurement process.
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*/
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i2c_lock_bus(data->client->adapter, I2C_LOCK_SEGMENT);
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data->osr &= ~AS73211_OSR_DOS_MASK;
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data->osr |= AS73211_OSR_DOS_MEASURE | AS73211_OSR_SS;
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smbus_data.byte = data->osr;
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ret = __i2c_smbus_xfer(data->client->adapter, data->client->addr,
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data->client->flags, I2C_SMBUS_WRITE,
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AS73211_REG_OSR, I2C_SMBUS_BYTE_DATA, &smbus_data);
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if (ret < 0) {
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i2c_unlock_bus(data->client->adapter, I2C_LOCK_SEGMENT);
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return ret;
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}
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/*
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* Reset AS73211_OSR_SS (is self clearing) in order to avoid unintentional
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* triggering of further measurements later.
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*/
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data->osr &= ~AS73211_OSR_SS;
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/*
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* Add 33% extra margin for the timeout. fclk,min = fclk,typ - 27%.
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*/
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time_us += time_us / 3;
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if (data->client->irq) {
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ret = wait_for_completion_timeout(&data->completion, usecs_to_jiffies(time_us));
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if (!ret) {
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dev_err(dev, "timeout waiting for READY IRQ\n");
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i2c_unlock_bus(data->client->adapter, I2C_LOCK_SEGMENT);
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return -ETIMEDOUT;
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}
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} else {
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/* Wait integration time */
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usleep_range(time_us, 2 * time_us);
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}
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i2c_unlock_bus(data->client->adapter, I2C_LOCK_SEGMENT);
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ret = i2c_smbus_read_word_data(data->client, AS73211_OUT_OSR_STATUS);
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if (ret < 0)
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return ret;
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osr_status = ret;
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if (osr_status != (AS73211_OSR_DOS_MEASURE | AS73211_OSR_STATUS_NDATA)) {
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if (osr_status & AS73211_OSR_SS) {
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dev_err(dev, "%s() Measurement has not stopped\n", __func__);
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return -ETIME;
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}
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if (osr_status & AS73211_OSR_STATUS_NOTREADY) {
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dev_err(dev, "%s() Data is not ready\n", __func__);
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return -ENODATA;
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}
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if (!(osr_status & AS73211_OSR_STATUS_NDATA)) {
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dev_err(dev, "%s() No new data available\n", __func__);
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return -ENODATA;
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}
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if (osr_status & AS73211_OSR_STATUS_LDATA) {
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dev_err(dev, "%s() Result buffer overrun\n", __func__);
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return -ENOBUFS;
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}
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if (osr_status & AS73211_OSR_STATUS_ADCOF) {
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dev_err(dev, "%s() ADC overflow\n", __func__);
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return -EOVERFLOW;
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}
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if (osr_status & AS73211_OSR_STATUS_MRESOF) {
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dev_err(dev, "%s() Measurement result overflow\n", __func__);
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return -EOVERFLOW;
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}
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if (osr_status & AS73211_OSR_STATUS_OUTCONVOF) {
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dev_err(dev, "%s() Timer overflow\n", __func__);
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return -EOVERFLOW;
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}
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dev_err(dev, "%s() Unexpected status value\n", __func__);
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return -EIO;
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}
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return 0;
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}
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static int as73211_read_raw(struct iio_dev *indio_dev, 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 as73211_data *data = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_RAW: {
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int ret;
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ret = iio_device_claim_direct_mode(indio_dev);
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if (ret < 0)
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return ret;
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ret = as73211_req_data(data);
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if (ret < 0) {
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iio_device_release_direct_mode(indio_dev);
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return ret;
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}
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ret = i2c_smbus_read_word_data(data->client, chan->address);
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iio_device_release_direct_mode(indio_dev);
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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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}
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case IIO_CHAN_INFO_OFFSET:
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*val = AS73211_OFFSET_TEMP_INT;
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*val2 = AS73211_OFFSET_TEMP_MICRO;
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return IIO_VAL_INT_PLUS_MICRO;
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case IIO_CHAN_INFO_SCALE:
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switch (chan->type) {
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case IIO_TEMP:
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*val = AS73211_SCALE_TEMP_INT;
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*val2 = AS73211_SCALE_TEMP_MICRO;
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return IIO_VAL_INT_PLUS_MICRO;
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case IIO_INTENSITY: {
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unsigned int scale;
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switch (chan->channel2) {
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case IIO_MOD_X:
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scale = AS73211_SCALE_X;
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break;
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case IIO_MOD_Y:
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scale = AS73211_SCALE_Y;
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break;
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case IIO_MOD_Z:
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scale = AS73211_SCALE_Z;
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break;
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default:
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return -EINVAL;
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}
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scale /= as73211_gain(data);
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scale /= as73211_integration_time_1024cyc(data);
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*val = scale;
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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_SAMP_FREQ:
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/* f_samp is configured in CREG3 in powers of 2 (x 1.024 MHz) */
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*val = BIT(FIELD_GET(AS73211_CREG3_CCLK_MASK, data->creg3)) *
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AS73211_SAMPLE_FREQ_BASE;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_HARDWAREGAIN:
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*val = as73211_gain(data);
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_INT_TIME: {
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unsigned int time_us;
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mutex_lock(&data->mutex);
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time_us = as73211_integration_time_us(data, as73211_integration_time_1024cyc(data));
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mutex_unlock(&data->mutex);
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*val = time_us / USEC_PER_SEC;
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*val2 = time_us % USEC_PER_SEC;
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return IIO_VAL_INT_PLUS_MICRO;
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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 as73211_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec const *chan,
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const int **vals, int *type, int *length, long mask)
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{
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struct as73211_data *data = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_SAMP_FREQ:
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*length = ARRAY_SIZE(as73211_samp_freq_avail);
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*vals = as73211_samp_freq_avail;
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*type = IIO_VAL_INT;
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return IIO_AVAIL_LIST;
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case IIO_CHAN_INFO_HARDWAREGAIN:
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*length = ARRAY_SIZE(as73211_hardwaregain_avail);
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*vals = as73211_hardwaregain_avail;
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*type = IIO_VAL_INT;
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return IIO_AVAIL_LIST;
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case IIO_CHAN_INFO_INT_TIME:
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*length = ARRAY_SIZE(data->int_time_avail);
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*vals = data->int_time_avail;
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*type = IIO_VAL_INT_PLUS_MICRO;
|
|
return IIO_AVAIL_LIST;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static int _as73211_write_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan __always_unused,
|
|
int val, int val2, long mask)
|
|
{
|
|
struct as73211_data *data = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_SAMP_FREQ: {
|
|
int reg_bits, freq_kHz = val / HZ_PER_KHZ; /* 1024, 2048, ... */
|
|
|
|
/* val must be 1024 * 2^x */
|
|
if (val < 0 || (freq_kHz * HZ_PER_KHZ) != val ||
|
|
!is_power_of_2(freq_kHz) || val2)
|
|
return -EINVAL;
|
|
|
|
/* f_samp is configured in CREG3 in powers of 2 (x 1.024 MHz (=2^10)) */
|
|
reg_bits = ilog2(freq_kHz) - 10;
|
|
if (!FIELD_FIT(AS73211_CREG3_CCLK_MASK, reg_bits))
|
|
return -EINVAL;
|
|
|
|
data->creg3 &= ~AS73211_CREG3_CCLK_MASK;
|
|
data->creg3 |= FIELD_PREP(AS73211_CREG3_CCLK_MASK, reg_bits);
|
|
as73211_integration_time_calc_avail(data);
|
|
|
|
ret = i2c_smbus_write_byte_data(data->client, AS73211_REG_CREG3, data->creg3);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
case IIO_CHAN_INFO_HARDWAREGAIN: {
|
|
unsigned int reg_bits;
|
|
|
|
if (val < 0 || !is_power_of_2(val) || val2)
|
|
return -EINVAL;
|
|
|
|
/* gain can be calculated from CREG1 as 2^(11 - CREG1_GAIN) */
|
|
reg_bits = AS73211_CREG1_GAIN_1 - ilog2(val);
|
|
if (!FIELD_FIT(AS73211_CREG1_GAIN_MASK, reg_bits))
|
|
return -EINVAL;
|
|
|
|
data->creg1 &= ~AS73211_CREG1_GAIN_MASK;
|
|
data->creg1 |= FIELD_PREP(AS73211_CREG1_GAIN_MASK, reg_bits);
|
|
|
|
ret = i2c_smbus_write_byte_data(data->client, AS73211_REG_CREG1, data->creg1);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
case IIO_CHAN_INFO_INT_TIME: {
|
|
int val_us = val * USEC_PER_SEC + val2;
|
|
int time_ms;
|
|
int reg_bits;
|
|
|
|
/* f_samp is configured in CREG3 in powers of 2 (x 1.024 MHz) */
|
|
int f_samp_1_024mhz = BIT(FIELD_GET(AS73211_CREG3_CCLK_MASK, data->creg3));
|
|
|
|
/*
|
|
* time_ms = time_us * US_PER_MS * f_samp_1_024mhz / MHZ_PER_HZ
|
|
* = time_us * f_samp_1_024mhz / 1000
|
|
*/
|
|
time_ms = (val_us * f_samp_1_024mhz) / 1000; /* 1 ms, 2 ms, ... (power of two) */
|
|
if (time_ms < 0 || !is_power_of_2(time_ms) || time_ms > AS73211_SAMPLE_TIME_MAX_MS)
|
|
return -EINVAL;
|
|
|
|
reg_bits = ilog2(time_ms);
|
|
if (!FIELD_FIT(AS73211_CREG1_TIME_MASK, reg_bits))
|
|
return -EINVAL; /* not possible due to previous tests */
|
|
|
|
data->creg1 &= ~AS73211_CREG1_TIME_MASK;
|
|
data->creg1 |= FIELD_PREP(AS73211_CREG1_TIME_MASK, reg_bits);
|
|
|
|
ret = i2c_smbus_write_byte_data(data->client, AS73211_REG_CREG1, data->creg1);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}}
|
|
}
|
|
|
|
static int as73211_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan,
|
|
int val, int val2, long mask)
|
|
{
|
|
struct as73211_data *data = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
mutex_lock(&data->mutex);
|
|
|
|
ret = iio_device_claim_direct_mode(indio_dev);
|
|
if (ret < 0)
|
|
goto error_unlock;
|
|
|
|
/* Need to switch to config mode ... */
|
|
if ((data->osr & AS73211_OSR_DOS_MASK) != AS73211_OSR_DOS_CONFIG) {
|
|
data->osr &= ~AS73211_OSR_DOS_MASK;
|
|
data->osr |= AS73211_OSR_DOS_CONFIG;
|
|
|
|
ret = i2c_smbus_write_byte_data(data->client, AS73211_REG_OSR, data->osr);
|
|
if (ret < 0)
|
|
goto error_release;
|
|
}
|
|
|
|
ret = _as73211_write_raw(indio_dev, chan, val, val2, mask);
|
|
|
|
error_release:
|
|
iio_device_release_direct_mode(indio_dev);
|
|
error_unlock:
|
|
mutex_unlock(&data->mutex);
|
|
return ret;
|
|
}
|
|
|
|
static irqreturn_t as73211_ready_handler(int irq __always_unused, void *priv)
|
|
{
|
|
struct as73211_data *data = iio_priv(priv);
|
|
|
|
complete(&data->completion);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t as73211_trigger_handler(int irq __always_unused, void *p)
|
|
{
|
|
struct iio_poll_func *pf = p;
|
|
struct iio_dev *indio_dev = pf->indio_dev;
|
|
struct as73211_data *data = iio_priv(indio_dev);
|
|
struct {
|
|
__le16 chan[4];
|
|
s64 ts __aligned(8);
|
|
} scan;
|
|
int data_result, ret;
|
|
|
|
mutex_lock(&data->mutex);
|
|
|
|
data_result = as73211_req_data(data);
|
|
if (data_result < 0 && data_result != -EOVERFLOW)
|
|
goto done; /* don't push any data for errors other than EOVERFLOW */
|
|
|
|
if (*indio_dev->active_scan_mask == AS73211_SCAN_MASK_ALL) {
|
|
/* Optimization for reading all (color + temperature) channels */
|
|
u8 addr = as73211_channels[0].address;
|
|
struct i2c_msg msgs[] = {
|
|
{
|
|
.addr = data->client->addr,
|
|
.flags = 0,
|
|
.len = 1,
|
|
.buf = &addr,
|
|
},
|
|
{
|
|
.addr = data->client->addr,
|
|
.flags = I2C_M_RD,
|
|
.len = sizeof(scan.chan),
|
|
.buf = (u8 *)&scan.chan,
|
|
},
|
|
};
|
|
|
|
ret = i2c_transfer(data->client->adapter, msgs, ARRAY_SIZE(msgs));
|
|
if (ret < 0)
|
|
goto done;
|
|
} else {
|
|
/* Optimization for reading only color channels */
|
|
|
|
/* AS73211 starts reading at address 2 */
|
|
ret = i2c_master_recv(data->client,
|
|
(char *)&scan.chan[1], 3 * sizeof(scan.chan[1]));
|
|
if (ret < 0)
|
|
goto done;
|
|
}
|
|
|
|
if (data_result) {
|
|
/*
|
|
* Saturate all channels (in case of overflows). Temperature channel
|
|
* is not affected by overflows.
|
|
*/
|
|
scan.chan[1] = cpu_to_le16(U16_MAX);
|
|
scan.chan[2] = cpu_to_le16(U16_MAX);
|
|
scan.chan[3] = cpu_to_le16(U16_MAX);
|
|
}
|
|
|
|
iio_push_to_buffers_with_timestamp(indio_dev, &scan, iio_get_time_ns(indio_dev));
|
|
|
|
done:
|
|
mutex_unlock(&data->mutex);
|
|
iio_trigger_notify_done(indio_dev->trig);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static const struct iio_info as73211_info = {
|
|
.read_raw = as73211_read_raw,
|
|
.read_avail = as73211_read_avail,
|
|
.write_raw = as73211_write_raw,
|
|
};
|
|
|
|
static int as73211_power(struct iio_dev *indio_dev, bool state)
|
|
{
|
|
struct as73211_data *data = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
mutex_lock(&data->mutex);
|
|
|
|
if (state)
|
|
data->osr &= ~AS73211_OSR_PD;
|
|
else
|
|
data->osr |= AS73211_OSR_PD;
|
|
|
|
ret = i2c_smbus_write_byte_data(data->client, AS73211_REG_OSR, data->osr);
|
|
|
|
mutex_unlock(&data->mutex);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void as73211_power_disable(void *data)
|
|
{
|
|
struct iio_dev *indio_dev = data;
|
|
|
|
as73211_power(indio_dev, false);
|
|
}
|
|
|
|
static int as73211_probe(struct i2c_client *client)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
struct as73211_data *data;
|
|
struct iio_dev *indio_dev;
|
|
int ret;
|
|
|
|
indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
|
|
if (!indio_dev)
|
|
return -ENOMEM;
|
|
|
|
data = iio_priv(indio_dev);
|
|
i2c_set_clientdata(client, indio_dev);
|
|
data->client = client;
|
|
|
|
mutex_init(&data->mutex);
|
|
init_completion(&data->completion);
|
|
|
|
indio_dev->info = &as73211_info;
|
|
indio_dev->name = AS73211_DRV_NAME;
|
|
indio_dev->channels = as73211_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(as73211_channels);
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
|
|
ret = i2c_smbus_read_byte_data(data->client, AS73211_REG_OSR);
|
|
if (ret < 0)
|
|
return ret;
|
|
data->osr = ret;
|
|
|
|
/* reset device */
|
|
data->osr |= AS73211_OSR_SW_RES;
|
|
ret = i2c_smbus_write_byte_data(data->client, AS73211_REG_OSR, data->osr);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = i2c_smbus_read_byte_data(data->client, AS73211_REG_OSR);
|
|
if (ret < 0)
|
|
return ret;
|
|
data->osr = ret;
|
|
|
|
/*
|
|
* Reading AGEN is only possible after reset (AGEN is not available if
|
|
* device is in measurement mode).
|
|
*/
|
|
ret = i2c_smbus_read_byte_data(data->client, AS73211_REG_AGEN);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* At the time of writing this driver, only DEVID 2 and MUT 1 are known. */
|
|
if ((ret & AS73211_AGEN_DEVID_MASK) != AS73211_AGEN_DEVID(2) ||
|
|
(ret & AS73211_AGEN_MUT_MASK) != AS73211_AGEN_MUT(1))
|
|
return -ENODEV;
|
|
|
|
ret = i2c_smbus_read_byte_data(data->client, AS73211_REG_CREG1);
|
|
if (ret < 0)
|
|
return ret;
|
|
data->creg1 = ret;
|
|
|
|
ret = i2c_smbus_read_byte_data(data->client, AS73211_REG_CREG2);
|
|
if (ret < 0)
|
|
return ret;
|
|
data->creg2 = ret;
|
|
|
|
ret = i2c_smbus_read_byte_data(data->client, AS73211_REG_CREG3);
|
|
if (ret < 0)
|
|
return ret;
|
|
data->creg3 = ret;
|
|
as73211_integration_time_calc_avail(data);
|
|
|
|
ret = as73211_power(indio_dev, true);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = devm_add_action_or_reset(dev, as73211_power_disable, indio_dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL, as73211_trigger_handler, NULL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (client->irq) {
|
|
ret = devm_request_threaded_irq(&client->dev, client->irq,
|
|
NULL,
|
|
as73211_ready_handler,
|
|
IRQF_ONESHOT,
|
|
client->name, indio_dev);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return devm_iio_device_register(dev, indio_dev);
|
|
}
|
|
|
|
static int __maybe_unused as73211_suspend(struct device *dev)
|
|
{
|
|
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
|
|
|
|
return as73211_power(indio_dev, false);
|
|
}
|
|
|
|
static int __maybe_unused as73211_resume(struct device *dev)
|
|
{
|
|
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
|
|
|
|
return as73211_power(indio_dev, true);
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(as73211_pm_ops, as73211_suspend, as73211_resume);
|
|
|
|
static const struct of_device_id as73211_of_match[] = {
|
|
{ .compatible = "ams,as73211" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, as73211_of_match);
|
|
|
|
static const struct i2c_device_id as73211_id[] = {
|
|
{ "as73211", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, as73211_id);
|
|
|
|
static struct i2c_driver as73211_driver = {
|
|
.driver = {
|
|
.name = AS73211_DRV_NAME,
|
|
.of_match_table = as73211_of_match,
|
|
.pm = &as73211_pm_ops,
|
|
},
|
|
.probe_new = as73211_probe,
|
|
.id_table = as73211_id,
|
|
};
|
|
module_i2c_driver(as73211_driver);
|
|
|
|
MODULE_AUTHOR("Christian Eggers <ceggers@arri.de>");
|
|
MODULE_DESCRIPTION("AS73211 XYZ True Color Sensor driver");
|
|
MODULE_LICENSE("GPL");
|