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linux-stable/drivers/iio/light/as73211.c
Javier Carrasco 02324a09cb iio: light: as73211: add support for as7331 
The AMS AS7331 is a UV light sensor with three channels: UVA, UVB and
UVC (also known as deep UV and referenced as DUV in the iio core).
Its internal structure and forming blocks are practically identical to
the ones the AS73211 contains: API, internal DAC, I2C interface and
registers, measurement modes, number of channels and pinout.

The only difference between them is the photodiodes used to acquire
light, which means that only some modifications are required to add
support for the AS7331 in the existing driver.

The temperature channel is identical for both devices and only the
channel modifiers of the IIO_INTENSITY channels need to account for the
device type.

The scale values have been obtained from the chapter "7.5 Transfer
Function" of the official datasheet[1] for the configuration chosen as
basis (Nclk = 1024 and GAIN = 1). Those values keep the units from the
datasheet (nW/cm^2), as opposed to the units used for the AS73211
(nW/m^2).

Add a new device-specific data structure to account for the device
differences: channel types and scale of LSB per channel.

[1] https://ams.com/documents/20143/9106314/AS7331_DS001047_4-00.pdf

Tested-by: Christian Eggers <ceggers@arri.de>
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2024-01-22 18:58:44 +00:00

888 lines
24 KiB
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Raw Blame History

// SPDX-License-Identifier: GPL-2.0-only
/*
* Support for AMS AS73211 JENCOLOR(R) Digital XYZ Sensor and AMS AS7331
* UVA, UVB and UVC (DUV) Ultraviolet Sensor
*
* Author: Christian Eggers <ceggers@arri.de>
*
* Copyright (c) 2020 ARRI Lighting
*
* Color light sensor with 16-bit channels for x, y, z and temperature);
* 7-bit I2C slave address 0x74 .. 0x77.
*
* Datasheets:
* AS73211: https://ams.com/documents/20143/36005/AS73211_DS000556_3-01.pdf
* AS7331: https://ams.com/documents/20143/9106314/AS7331_DS001047_4-00.pdf
*/
#include <linux/bitfield.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/iio/buffer.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/pm.h>
#include <linux/units.h>
#define AS73211_DRV_NAME "as73211"
/* AS73211 configuration registers */
#define AS73211_REG_OSR 0x0
#define AS73211_REG_AGEN 0x2
#define AS73211_REG_CREG1 0x6
#define AS73211_REG_CREG2 0x7
#define AS73211_REG_CREG3 0x8
/* AS73211 output register bank */
#define AS73211_OUT_OSR_STATUS 0
#define AS73211_OUT_TEMP 1
#define AS73211_OUT_MRES1 2
#define AS73211_OUT_MRES2 3
#define AS73211_OUT_MRES3 4
#define AS73211_OSR_SS BIT(7)
#define AS73211_OSR_PD BIT(6)
#define AS73211_OSR_SW_RES BIT(3)
#define AS73211_OSR_DOS_MASK GENMASK(2, 0)
#define AS73211_OSR_DOS_CONFIG FIELD_PREP(AS73211_OSR_DOS_MASK, 0x2)
#define AS73211_OSR_DOS_MEASURE FIELD_PREP(AS73211_OSR_DOS_MASK, 0x3)
#define AS73211_AGEN_DEVID_MASK GENMASK(7, 4)
#define AS73211_AGEN_DEVID(x) FIELD_PREP(AS73211_AGEN_DEVID_MASK, (x))
#define AS73211_AGEN_MUT_MASK GENMASK(3, 0)
#define AS73211_AGEN_MUT(x) FIELD_PREP(AS73211_AGEN_MUT_MASK, (x))
#define AS73211_CREG1_GAIN_MASK GENMASK(7, 4)
#define AS73211_CREG1_GAIN_1 11
#define AS73211_CREG1_TIME_MASK GENMASK(3, 0)
#define AS73211_CREG3_CCLK_MASK GENMASK(1, 0)
#define AS73211_OSR_STATUS_OUTCONVOF BIT(15)
#define AS73211_OSR_STATUS_MRESOF BIT(14)
#define AS73211_OSR_STATUS_ADCOF BIT(13)
#define AS73211_OSR_STATUS_LDATA BIT(12)
#define AS73211_OSR_STATUS_NDATA BIT(11)
#define AS73211_OSR_STATUS_NOTREADY BIT(10)
#define AS73211_SAMPLE_FREQ_BASE 1024000
#define AS73211_SAMPLE_TIME_NUM 15
#define AS73211_SAMPLE_TIME_MAX_MS BIT(AS73211_SAMPLE_TIME_NUM - 1)
/* Available sample frequencies are 1.024MHz multiplied by powers of two. */
static const int as73211_samp_freq_avail[] = {
AS73211_SAMPLE_FREQ_BASE * 1,
AS73211_SAMPLE_FREQ_BASE * 2,
AS73211_SAMPLE_FREQ_BASE * 4,
AS73211_SAMPLE_FREQ_BASE * 8,
};
static const int as73211_hardwaregain_avail[] = {
1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048,
};
struct as73211_data;
/**
* struct as73211_spec_dev_data - device-specific data
* @intensity_scale: Function to retrieve intensity scale values.
* @channels: Device channels.
* @num_channels: Number of channels of the device.
*/
struct as73211_spec_dev_data {
int (*intensity_scale)(struct as73211_data *data, int chan, int *val, int *val2);
struct iio_chan_spec const *channels;
int num_channels;
};
/**
* struct as73211_data - Instance data for one AS73211
* @client: I2C client.
* @osr: Cached Operational State Register.
* @creg1: Cached Configuration Register 1.
* @creg2: Cached Configuration Register 2.
* @creg3: Cached Configuration Register 3.
* @mutex: Keeps cached registers in sync with the device.
* @completion: Completion to wait for interrupt.
* @int_time_avail: Available integration times (depend on sampling frequency).
* @spec_dev: device-specific configuration.
*/
struct as73211_data {
struct i2c_client *client;
u8 osr;
u8 creg1;
u8 creg2;
u8 creg3;
struct mutex mutex;
struct completion completion;
int int_time_avail[AS73211_SAMPLE_TIME_NUM * 2];
const struct as73211_spec_dev_data *spec_dev;
};
#define AS73211_COLOR_CHANNEL(_color, _si, _addr) { \
.type = IIO_INTENSITY, \
.modified = 1, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), \
.info_mask_shared_by_type = \
BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
BIT(IIO_CHAN_INFO_HARDWAREGAIN) | \
BIT(IIO_CHAN_INFO_INT_TIME), \
.info_mask_shared_by_type_available = \
BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
BIT(IIO_CHAN_INFO_HARDWAREGAIN) | \
BIT(IIO_CHAN_INFO_INT_TIME), \
.channel2 = IIO_MOD_##_color, \
.address = _addr, \
.scan_index = _si, \
.scan_type = { \
.sign = 'u', \
.realbits = 16, \
.storagebits = 16, \
.endianness = IIO_LE, \
}, \
}
#define AS73211_OFFSET_TEMP_INT (-66)
#define AS73211_OFFSET_TEMP_MICRO 900000
#define AS73211_SCALE_TEMP_INT 0
#define AS73211_SCALE_TEMP_MICRO 50000
#define AS73211_SCALE_X 277071108 /* nW/m^2 */
#define AS73211_SCALE_Y 298384270 /* nW/m^2 */
#define AS73211_SCALE_Z 160241927 /* nW/m^2 */
#define AS7331_SCALE_UVA 340000 /* nW/cm^2 */
#define AS7331_SCALE_UVB 378000 /* nW/cm^2 */
#define AS7331_SCALE_UVC 166000 /* nW/cm^2 */
/* Channel order MUST match devices result register order */
#define AS73211_SCAN_INDEX_TEMP 0
#define AS73211_SCAN_INDEX_X 1
#define AS73211_SCAN_INDEX_Y 2
#define AS73211_SCAN_INDEX_Z 3
#define AS73211_SCAN_INDEX_TS 4
#define AS73211_SCAN_MASK_COLOR ( \
BIT(AS73211_SCAN_INDEX_X) | \
BIT(AS73211_SCAN_INDEX_Y) | \
BIT(AS73211_SCAN_INDEX_Z))
#define AS73211_SCAN_MASK_ALL ( \
BIT(AS73211_SCAN_INDEX_TEMP) | \
AS73211_SCAN_MASK_COLOR)
static const struct iio_chan_spec as73211_channels[] = {
{
.type = IIO_TEMP,
.info_mask_separate =
BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_OFFSET) |
BIT(IIO_CHAN_INFO_SCALE),
.address = AS73211_OUT_TEMP,
.scan_index = AS73211_SCAN_INDEX_TEMP,
.scan_type = {
.sign = 'u',
.realbits = 16,
.storagebits = 16,
.endianness = IIO_LE,
}
},
AS73211_COLOR_CHANNEL(X, AS73211_SCAN_INDEX_X, AS73211_OUT_MRES1),
AS73211_COLOR_CHANNEL(Y, AS73211_SCAN_INDEX_Y, AS73211_OUT_MRES2),
AS73211_COLOR_CHANNEL(Z, AS73211_SCAN_INDEX_Z, AS73211_OUT_MRES3),
IIO_CHAN_SOFT_TIMESTAMP(AS73211_SCAN_INDEX_TS),
};
static const struct iio_chan_spec as7331_channels[] = {
{
.type = IIO_TEMP,
.info_mask_separate =
BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_OFFSET) |
BIT(IIO_CHAN_INFO_SCALE),
.address = AS73211_OUT_TEMP,
.scan_index = AS73211_SCAN_INDEX_TEMP,
.scan_type = {
.sign = 'u',
.realbits = 16,
.storagebits = 16,
.endianness = IIO_LE,
}
},
AS73211_COLOR_CHANNEL(LIGHT_UVA, AS73211_SCAN_INDEX_X, AS73211_OUT_MRES1),
AS73211_COLOR_CHANNEL(LIGHT_UVB, AS73211_SCAN_INDEX_Y, AS73211_OUT_MRES2),
AS73211_COLOR_CHANNEL(LIGHT_DUV, AS73211_SCAN_INDEX_Z, AS73211_OUT_MRES3),
IIO_CHAN_SOFT_TIMESTAMP(AS73211_SCAN_INDEX_TS),
};
static unsigned int as73211_integration_time_1024cyc(struct as73211_data *data)
{
/*
* Return integration time in units of 1024 clock cycles. Integration time
* in CREG1 is in powers of 2 (x 1024 cycles).
*/
return BIT(FIELD_GET(AS73211_CREG1_TIME_MASK, data->creg1));
}
static unsigned int as73211_integration_time_us(struct as73211_data *data,
unsigned int integration_time_1024cyc)
{
/*
* f_samp is configured in CREG3 in powers of 2 (x 1.024 MHz)
* t_cycl is configured in CREG1 in powers of 2 (x 1024 cycles)
* t_int_us = 1 / (f_samp) * t_cycl * US_PER_SEC
* = 1 / (2^CREG3_CCLK * 1,024,000) * 2^CREG1_CYCLES * 1,024 * US_PER_SEC
* = 2^(-CREG3_CCLK) * 2^CREG1_CYCLES * 1,000
* In order to get rid of negative exponents, we extend the "fraction"
* by 2^3 (CREG3_CCLK,max = 3)
* t_int_us = 2^(3-CREG3_CCLK) * 2^CREG1_CYCLES * 125
*/
return BIT(3 - FIELD_GET(AS73211_CREG3_CCLK_MASK, data->creg3)) *
integration_time_1024cyc * 125;
}
static void as73211_integration_time_calc_avail(struct as73211_data *data)
{
int i;
for (i = 0; i < ARRAY_SIZE(data->int_time_avail) / 2; i++) {
unsigned int time_us = as73211_integration_time_us(data, BIT(i));
data->int_time_avail[i * 2 + 0] = time_us / USEC_PER_SEC;
data->int_time_avail[i * 2 + 1] = time_us % USEC_PER_SEC;
}
}
static unsigned int as73211_gain(struct as73211_data *data)
{
/* gain can be calculated from CREG1 as 2^(11 - CREG1_GAIN) */
return BIT(AS73211_CREG1_GAIN_1 - FIELD_GET(AS73211_CREG1_GAIN_MASK, data->creg1));
}
/* must be called with as73211_data::mutex held. */
static int as73211_req_data(struct as73211_data *data)
{
unsigned int time_us = as73211_integration_time_us(data,
as73211_integration_time_1024cyc(data));
struct device *dev = &data->client->dev;
union i2c_smbus_data smbus_data;
u16 osr_status;
int ret;
if (data->client->irq)
reinit_completion(&data->completion);
/*
* During measurement, there should be no traffic on the i2c bus as the
* electrical noise would disturb the measurement process.
*/
i2c_lock_bus(data->client->adapter, I2C_LOCK_SEGMENT);
data->osr &= ~AS73211_OSR_DOS_MASK;
data->osr |= AS73211_OSR_DOS_MEASURE | AS73211_OSR_SS;
smbus_data.byte = data->osr;
ret = __i2c_smbus_xfer(data->client->adapter, data->client->addr,
data->client->flags, I2C_SMBUS_WRITE,
AS73211_REG_OSR, I2C_SMBUS_BYTE_DATA, &smbus_data);
if (ret < 0) {
i2c_unlock_bus(data->client->adapter, I2C_LOCK_SEGMENT);
return ret;
}
/*
* Reset AS73211_OSR_SS (is self clearing) in order to avoid unintentional
* triggering of further measurements later.
*/
data->osr &= ~AS73211_OSR_SS;
/*
* Add 33% extra margin for the timeout. fclk,min = fclk,typ - 27%.
*/
time_us += time_us / 3;
if (data->client->irq) {
ret = wait_for_completion_timeout(&data->completion, usecs_to_jiffies(time_us));
if (!ret) {
dev_err(dev, "timeout waiting for READY IRQ\n");
i2c_unlock_bus(data->client->adapter, I2C_LOCK_SEGMENT);
return -ETIMEDOUT;
}
} else {
/* Wait integration time */
usleep_range(time_us, 2 * time_us);
}
i2c_unlock_bus(data->client->adapter, I2C_LOCK_SEGMENT);
ret = i2c_smbus_read_word_data(data->client, AS73211_OUT_OSR_STATUS);
if (ret < 0)
return ret;
osr_status = ret;
if (osr_status != (AS73211_OSR_DOS_MEASURE | AS73211_OSR_STATUS_NDATA)) {
if (osr_status & AS73211_OSR_SS) {
dev_err(dev, "%s() Measurement has not stopped\n", __func__);
return -ETIME;
}
if (osr_status & AS73211_OSR_STATUS_NOTREADY) {
dev_err(dev, "%s() Data is not ready\n", __func__);
return -ENODATA;
}
if (!(osr_status & AS73211_OSR_STATUS_NDATA)) {
dev_err(dev, "%s() No new data available\n", __func__);
return -ENODATA;
}
if (osr_status & AS73211_OSR_STATUS_LDATA) {
dev_err(dev, "%s() Result buffer overrun\n", __func__);
return -ENOBUFS;
}
if (osr_status & AS73211_OSR_STATUS_ADCOF) {
dev_err(dev, "%s() ADC overflow\n", __func__);
return -EOVERFLOW;
}
if (osr_status & AS73211_OSR_STATUS_MRESOF) {
dev_err(dev, "%s() Measurement result overflow\n", __func__);
return -EOVERFLOW;
}
if (osr_status & AS73211_OSR_STATUS_OUTCONVOF) {
dev_err(dev, "%s() Timer overflow\n", __func__);
return -EOVERFLOW;
}
dev_err(dev, "%s() Unexpected status value\n", __func__);
return -EIO;
}
return 0;
}
static int as73211_intensity_scale(struct as73211_data *data, int chan,
int *val, int *val2)
{
switch (chan) {
case IIO_MOD_X:
*val = AS73211_SCALE_X;
break;
case IIO_MOD_Y:
*val = AS73211_SCALE_Y;
break;
case IIO_MOD_Z:
*val = AS73211_SCALE_Z;
break;
default:
return -EINVAL;
}
*val2 = as73211_integration_time_1024cyc(data) * as73211_gain(data);
return IIO_VAL_FRACTIONAL;
}
static int as7331_intensity_scale(struct as73211_data *data, int chan,
int *val, int *val2)
{
switch (chan) {
case IIO_MOD_LIGHT_UVA:
*val = AS7331_SCALE_UVA;
break;
case IIO_MOD_LIGHT_UVB:
*val = AS7331_SCALE_UVB;
break;
case IIO_MOD_LIGHT_DUV:
*val = AS7331_SCALE_UVC;
break;
default:
return -EINVAL;
}
*val2 = as73211_integration_time_1024cyc(data) * as73211_gain(data);
return IIO_VAL_FRACTIONAL;
}
static int as73211_read_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);
switch (mask) {
case IIO_CHAN_INFO_RAW: {
int ret;
ret = iio_device_claim_direct_mode(indio_dev);
if (ret < 0)
return ret;
ret = as73211_req_data(data);
if (ret < 0) {
iio_device_release_direct_mode(indio_dev);
return ret;
}
ret = i2c_smbus_read_word_data(data->client, chan->address);
iio_device_release_direct_mode(indio_dev);
if (ret < 0)
return ret;
*val = ret;
return IIO_VAL_INT;
}
case IIO_CHAN_INFO_OFFSET:
*val = AS73211_OFFSET_TEMP_INT;
*val2 = AS73211_OFFSET_TEMP_MICRO;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_TEMP:
*val = AS73211_SCALE_TEMP_INT;
*val2 = AS73211_SCALE_TEMP_MICRO;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_INTENSITY:
return data->spec_dev->intensity_scale(data, chan->channel2,
val, val2);
default:
return -EINVAL;
}
case IIO_CHAN_INFO_SAMP_FREQ:
/* f_samp is configured in CREG3 in powers of 2 (x 1.024 MHz) */
*val = BIT(FIELD_GET(AS73211_CREG3_CCLK_MASK, data->creg3)) *
AS73211_SAMPLE_FREQ_BASE;
return IIO_VAL_INT;
case IIO_CHAN_INFO_HARDWAREGAIN:
*val = as73211_gain(data);
return IIO_VAL_INT;
case IIO_CHAN_INFO_INT_TIME: {
unsigned int time_us;
mutex_lock(&data->mutex);
time_us = as73211_integration_time_us(data, as73211_integration_time_1024cyc(data));
mutex_unlock(&data->mutex);
*val = time_us / USEC_PER_SEC;
*val2 = time_us % USEC_PER_SEC;
return IIO_VAL_INT_PLUS_MICRO;
default:
return -EINVAL;
}}
}
static int as73211_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec const *chan,
const int **vals, int *type, int *length, long mask)
{
struct as73211_data *data = iio_priv(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
*length = ARRAY_SIZE(as73211_samp_freq_avail);
*vals = as73211_samp_freq_avail;
*type = IIO_VAL_INT;
return IIO_AVAIL_LIST;
case IIO_CHAN_INFO_HARDWAREGAIN:
*length = ARRAY_SIZE(as73211_hardwaregain_avail);
*vals = as73211_hardwaregain_avail;
*type = IIO_VAL_INT;
return IIO_AVAIL_LIST;
case IIO_CHAN_INFO_INT_TIME:
*length = ARRAY_SIZE(data->int_time_avail);
*vals = data->int_time_avail;
*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;
data->spec_dev = i2c_get_match_data(client);
if (!data->spec_dev)
return -EINVAL;
mutex_init(&data->mutex);
init_completion(&data->completion);
indio_dev->info = &as73211_info;
indio_dev->name = AS73211_DRV_NAME;
indio_dev->channels = data->spec_dev->channels;
indio_dev->num_channels = data->spec_dev->num_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 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 as73211_resume(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
return as73211_power(indio_dev, true);
}
static DEFINE_SIMPLE_DEV_PM_OPS(as73211_pm_ops, as73211_suspend,
as73211_resume);
static const struct as73211_spec_dev_data as73211_spec = {
.intensity_scale = as73211_intensity_scale,
.channels = as73211_channels,
.num_channels = ARRAY_SIZE(as73211_channels),
};
static const struct as73211_spec_dev_data as7331_spec = {
.intensity_scale = as7331_intensity_scale,
.channels = as7331_channels,
.num_channels = ARRAY_SIZE(as7331_channels),
};
static const struct of_device_id as73211_of_match[] = {
{ .compatible = "ams,as73211", &as73211_spec },
{ .compatible = "ams,as7331", &as7331_spec },
{ }
};
MODULE_DEVICE_TABLE(of, as73211_of_match);
static const struct i2c_device_id as73211_id[] = {
{ "as73211", (kernel_ulong_t)&as73211_spec },
{ "as7331", (kernel_ulong_t)&as7331_spec },
{ }
};
MODULE_DEVICE_TABLE(i2c, as73211_id);
static struct i2c_driver as73211_driver = {
.driver = {
.name = AS73211_DRV_NAME,
.of_match_table = as73211_of_match,
.pm = pm_sleep_ptr(&as73211_pm_ops),
},
.probe = 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");
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