On Thu, 6 Aug 2020 18:44:51 +0100 Jonathan Cameron <jic23@xxxxxxxxxx> wrote: > On Wed, 5 Aug 2020 07:57:44 +0200 > Christian Eggers <ceggers@xxxxxxx> wrote: > > > Support for AMS AS73211 JENCOLOR(R) Digital XYZ Sensor. > > > > This driver has no built-in trigger. In order for making triggered > > measurements, an external (software) trigger driver like > > iio-trig-hrtimer or iio-trig-sysfs is required. > > > > The sensor supports single and continuous measurement modes. The latter > > is not used by design as this would require tight timing synchronization > > between hardware and driver without much benefit. > > > > Datasheet: https://ams.com/documents/20143/36005/AS73211_DS000556_3-01.pdf > > Signed-off-by: Christian Eggers <ceggers@xxxxxxx> > > Hi Christian, > > I'll take this, but please send a follow up patch to add documentation > for in_intensity_x_raw and all the other new ABI this adds in > Documentation/ABI/testing/sysfs-bus-iio > I should have mentioned that earlier, but kind of assumed we already > had these documented for some reason! > > Applied to the togreg branch of iio.git and pushed out as testing for > the autobuilders to play with it. > > Thanks, > > Jonathan Unfortunatey I don't have the thread on this account / machine so I'll reply here. 0-day highlighted an issue in here and Andy sent a suggested fix. What Andy suggested almost works but there are some subtleties. So before I make the change directly on the patch I wanted to confirm I haven't gotten it horribly wrong! I'm proposing just halving the range of the loop. See below. Thanks, Jonathan > > > > --- > > MAINTAINERS | 7 + > > drivers/iio/light/Kconfig | 15 + > > drivers/iio/light/Makefile | 1 + > > drivers/iio/light/as73211.c | 801 ++++++++++++++++++++++++++++++++++++ > > 4 files changed, 824 insertions(+) > > create mode 100644 drivers/iio/light/as73211.c > > > > diff --git a/MAINTAINERS b/MAINTAINERS > > index 068d6e94122b..673570414147 100644 > > --- a/MAINTAINERS > > +++ b/MAINTAINERS > > @@ -934,6 +934,13 @@ S: Supported > > F: arch/arm64/boot/dts/amd/amd-seattle-xgbe*.dtsi > > F: drivers/net/ethernet/amd/xgbe/ > > > > +AMS AS73211 DRIVER > > +M: Christian Eggers <ceggers@xxxxxxx> > > +L: linux-iio@xxxxxxxxxxxxxxx > > +S: Maintained > > +F: Documentation/devicetree/bindings/iio/light/ams,as73211.yaml > > +F: drivers/iio/light/as73211.c > > + > > ANALOG DEVICES INC AD5686 DRIVER > > M: Michael Hennerich <Michael.Hennerich@xxxxxxxxxx> > > L: linux-pm@xxxxxxxxxxxxxxx > > diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig > > index 182bd18c4bb2..cade6dc0305b 100644 > > --- a/drivers/iio/light/Kconfig > > +++ b/drivers/iio/light/Kconfig > > @@ -86,6 +86,21 @@ config APDS9960 > > To compile this driver as a module, choose M here: the > > module will be called apds9960 > > > > +config AS73211 > > + tristate "AMS AS73211 XYZ color sensor" > > + depends on I2C > > + select IIO_BUFFER > > + select IIO_TRIGGERED_BUFFER > > + help > > + If you say yes here you get support for the AMS AS73211 > > + JENCOLOR(R) Digital XYZ Sensor. > > + > > + For triggered measurements, you will need an additional trigger driver > > + like IIO_HRTIMER_TRIGGER or IIO_SYSFS_TRIGGER. > > + > > + This driver can also be built as a module. If so, the module > > + will be called as73211. > > + > > config BH1750 > > tristate "ROHM BH1750 ambient light sensor" > > depends on I2C > > diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile > > index d1c8aa30b9a8..ea376deaca54 100644 > > --- a/drivers/iio/light/Makefile > > +++ b/drivers/iio/light/Makefile > > @@ -11,6 +11,7 @@ obj-$(CONFIG_AL3010) += al3010.o > > obj-$(CONFIG_AL3320A) += al3320a.o > > obj-$(CONFIG_APDS9300) += apds9300.o > > obj-$(CONFIG_APDS9960) += apds9960.o > > +obj-$(CONFIG_AS73211) += as73211.o > > obj-$(CONFIG_BH1750) += bh1750.o > > obj-$(CONFIG_BH1780) += bh1780.o > > obj-$(CONFIG_CM32181) += cm32181.o > > diff --git a/drivers/iio/light/as73211.c b/drivers/iio/light/as73211.c > > new file mode 100644 > > index 000000000000..3383aaacbf52 > > --- /dev/null > > +++ b/drivers/iio/light/as73211.c > > @@ -0,0 +1,801 @@ > > +// SPDX-License-Identifier: GPL-2.0-only > > +/* > > + * Support for AMS AS73211 JENCOLOR(R) Digital XYZ Sensor > > + * > > + * Author: Christian Eggers <ceggers@xxxxxxx> > > + * > > + * 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. > > + * > > + * Datasheet: https://ams.com/documents/20143/36005/AS73211_DS000556_3-01.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> > > + > > +#define HZ_PER_KHZ 1000 > > + > > +#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 13 > > +#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 - 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). > > + */ > > +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]; This is a flat array, as get_avail assumes. > > +}; > > + > > +#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 */ > > + > > +/* 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 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); i++) { This loops goes to double the size of the array. I'd propose to just do ARRAY_SIZE(data->int_time_avail) / 2 here > > + 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^(13 - 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 some extra margin for the timeout. sensor timing is not as precise > > + * as our one ... > > + */ > > + time_us += time_us / 8; > > + 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_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: { > > + unsigned int scale; > > + > > + switch (chan->channel2) { > > + case IIO_MOD_X: > > + scale = AS73211_SCALE_X; > > + break; > > + case IIO_MOD_Y: > > + scale = AS73211_SCALE_Y; > > + break; > > + case IIO_MOD_Z: > > + scale = AS73211_SCALE_Z; > > + break; > > + default: > > + return -EINVAL; > > + } > > + scale /= as73211_gain(data); > > + scale /= as73211_integration_time_1024cyc(data); > > + *val = scale; > > + return IIO_VAL_INT; > > + > > + 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); This length is correct as read_avail expects it to be double the number of entries, if using IIO_VAL_INT_PLUS_MICRO. > > + *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^(13 - 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@xxxxxxx>"); > > +MODULE_DESCRIPTION("AS73211 XYZ True Color Sensor driver"); > > +MODULE_LICENSE("GPL"); >
