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-rw-r--r--MAINTAINERS7
-rw-r--r--drivers/iio/light/Kconfig15
-rw-r--r--drivers/iio/light/Makefile1
-rw-r--r--drivers/iio/light/as73211.c801
4 files changed, 824 insertions, 0 deletions
diff --git a/MAINTAINERS b/MAINTAINERS
index 39bf100972e9..2e9d0ccd66a1 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -943,6 +943,13 @@ 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@arri.de>
+L: linux-iio@vger.kernel.org
+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@analog.com>
L: linux-pm@vger.kernel.org
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..b1178dfc1f65
--- /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@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.
+ *
+ * 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 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 - 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];
+};
+
+#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) / 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 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);
+ *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;
+
+ mutex_init(&data->mutex);
+ init_completion(&data->completion);
+
+ indio_dev->info = &as73211_info;
+ indio_dev->name = AS73211_DRV_NAME;
+ indio_dev->channels = as73211_channels;
+ indio_dev->num_channels = ARRAY_SIZE(as73211_channels);
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ ret = i2c_smbus_read_byte_data(data->client, AS73211_REG_OSR);
+ if (ret < 0)
+ return ret;
+ data->osr = ret;
+
+ /* reset device */
+ data->osr |= AS73211_OSR_SW_RES;
+ ret = i2c_smbus_write_byte_data(data->client, AS73211_REG_OSR, data->osr);
+ if (ret < 0)
+ return ret;
+
+ ret = i2c_smbus_read_byte_data(data->client, AS73211_REG_OSR);
+ if (ret < 0)
+ return ret;
+ data->osr = ret;
+
+ /*
+ * Reading AGEN is only possible after reset (AGEN is not available if
+ * device is in measurement mode).
+ */
+ ret = i2c_smbus_read_byte_data(data->client, AS73211_REG_AGEN);
+ if (ret < 0)
+ return ret;
+
+ /* At the time of writing this driver, only DEVID 2 and MUT 1 are known. */
+ if ((ret & AS73211_AGEN_DEVID_MASK) != AS73211_AGEN_DEVID(2) ||
+ (ret & AS73211_AGEN_MUT_MASK) != AS73211_AGEN_MUT(1))
+ return -ENODEV;
+
+ ret = i2c_smbus_read_byte_data(data->client, AS73211_REG_CREG1);
+ if (ret < 0)
+ return ret;
+ data->creg1 = ret;
+
+ ret = i2c_smbus_read_byte_data(data->client, AS73211_REG_CREG2);
+ if (ret < 0)
+ return ret;
+ data->creg2 = ret;
+
+ ret = i2c_smbus_read_byte_data(data->client, AS73211_REG_CREG3);
+ if (ret < 0)
+ return ret;
+ data->creg3 = ret;
+ as73211_integration_time_calc_avail(data);
+
+ ret = as73211_power(indio_dev, true);
+ if (ret < 0)
+ return ret;
+
+ ret = devm_add_action_or_reset(dev, as73211_power_disable, indio_dev);
+ if (ret)
+ return ret;
+
+ ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL, as73211_trigger_handler, NULL);
+ if (ret)
+ return ret;
+
+ if (client->irq) {
+ ret = devm_request_threaded_irq(&client->dev, client->irq,
+ NULL,
+ as73211_ready_handler,
+ IRQF_ONESHOT,
+ client->name, indio_dev);
+ if (ret)
+ return ret;
+ }
+
+ return devm_iio_device_register(dev, indio_dev);
+}
+
+static int __maybe_unused as73211_suspend(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+
+ return as73211_power(indio_dev, false);
+}
+
+static int __maybe_unused as73211_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+
+ return as73211_power(indio_dev, true);
+}
+
+static SIMPLE_DEV_PM_OPS(as73211_pm_ops, as73211_suspend, as73211_resume);
+
+static const struct of_device_id as73211_of_match[] = {
+ { .compatible = "ams,as73211" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, as73211_of_match);
+
+static const struct i2c_device_id as73211_id[] = {
+ { "as73211", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, as73211_id);
+
+static struct i2c_driver as73211_driver = {
+ .driver = {
+ .name = AS73211_DRV_NAME,
+ .of_match_table = as73211_of_match,
+ .pm = &as73211_pm_ops,
+ },
+ .probe_new = as73211_probe,
+ .id_table = as73211_id,
+};
+module_i2c_driver(as73211_driver);
+
+MODULE_AUTHOR("Christian Eggers <ceggers@arri.de>");
+MODULE_DESCRIPTION("AS73211 XYZ True Color Sensor driver");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-14 04:52:32 +0000