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800 lines
21 KiB
800 lines
21 KiB
// 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 <[email protected]> |
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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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|
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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; |
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return IIO_AVAIL_LIST; |
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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_write_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan __always_unused, |
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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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int ret; |
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switch (mask) { |
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case IIO_CHAN_INFO_SAMP_FREQ: { |
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int reg_bits, freq_kHz = val / HZ_PER_KHZ; /* 1024, 2048, ... */ |
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/* val must be 1024 * 2^x */ |
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if (val < 0 || (freq_kHz * HZ_PER_KHZ) != val || |
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!is_power_of_2(freq_kHz) || val2) |
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return -EINVAL; |
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/* f_samp is configured in CREG3 in powers of 2 (x 1.024 MHz (=2^10)) */ |
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reg_bits = ilog2(freq_kHz) - 10; |
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if (!FIELD_FIT(AS73211_CREG3_CCLK_MASK, reg_bits)) |
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return -EINVAL; |
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data->creg3 &= ~AS73211_CREG3_CCLK_MASK; |
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data->creg3 |= FIELD_PREP(AS73211_CREG3_CCLK_MASK, reg_bits); |
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as73211_integration_time_calc_avail(data); |
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ret = i2c_smbus_write_byte_data(data->client, AS73211_REG_CREG3, data->creg3); |
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if (ret < 0) |
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return ret; |
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return 0; |
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} |
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case IIO_CHAN_INFO_HARDWAREGAIN: { |
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unsigned int reg_bits; |
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if (val < 0 || !is_power_of_2(val) || val2) |
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return -EINVAL; |
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/* gain can be calculated from CREG1 as 2^(11 - CREG1_GAIN) */ |
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reg_bits = AS73211_CREG1_GAIN_1 - ilog2(val); |
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if (!FIELD_FIT(AS73211_CREG1_GAIN_MASK, reg_bits)) |
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return -EINVAL; |
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data->creg1 &= ~AS73211_CREG1_GAIN_MASK; |
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data->creg1 |= FIELD_PREP(AS73211_CREG1_GAIN_MASK, reg_bits); |
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ret = i2c_smbus_write_byte_data(data->client, AS73211_REG_CREG1, data->creg1); |
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if (ret < 0) |
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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 <[email protected]>"); |
|
MODULE_DESCRIPTION("AS73211 XYZ True Color Sensor driver"); |
|
MODULE_LICENSE("GPL");
|
|
|