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618 lines
15 KiB
618 lines
15 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* tcs3472.c - Support for TAOS TCS3472 color light-to-digital converter |
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* |
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* Copyright (c) 2013 Peter Meerwald <[email protected]> |
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* |
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* Color light sensor with 16-bit channels for red, green, blue, clear); |
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* 7-bit I2C slave address 0x39 (TCS34721, TCS34723) or 0x29 (TCS34725, |
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* TCS34727) |
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* |
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* Datasheet: http://ams.com/eng/content/download/319364/1117183/file/TCS3472_Datasheet_EN_v2.pdf |
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* |
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* TODO: wait time |
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*/ |
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#include <linux/module.h> |
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#include <linux/i2c.h> |
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#include <linux/delay.h> |
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#include <linux/pm.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/events.h> |
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#include <linux/iio/trigger_consumer.h> |
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#include <linux/iio/buffer.h> |
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#include <linux/iio/triggered_buffer.h> |
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#define TCS3472_DRV_NAME "tcs3472" |
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#define TCS3472_COMMAND BIT(7) |
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#define TCS3472_AUTO_INCR BIT(5) |
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#define TCS3472_SPECIAL_FUNC (BIT(5) | BIT(6)) |
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|
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#define TCS3472_INTR_CLEAR (TCS3472_COMMAND | TCS3472_SPECIAL_FUNC | 0x06) |
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#define TCS3472_ENABLE (TCS3472_COMMAND | 0x00) |
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#define TCS3472_ATIME (TCS3472_COMMAND | 0x01) |
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#define TCS3472_WTIME (TCS3472_COMMAND | 0x03) |
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#define TCS3472_AILT (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x04) |
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#define TCS3472_AIHT (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x06) |
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#define TCS3472_PERS (TCS3472_COMMAND | 0x0c) |
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#define TCS3472_CONFIG (TCS3472_COMMAND | 0x0d) |
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#define TCS3472_CONTROL (TCS3472_COMMAND | 0x0f) |
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#define TCS3472_ID (TCS3472_COMMAND | 0x12) |
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#define TCS3472_STATUS (TCS3472_COMMAND | 0x13) |
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#define TCS3472_CDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x14) |
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#define TCS3472_RDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x16) |
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#define TCS3472_GDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x18) |
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#define TCS3472_BDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x1a) |
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#define TCS3472_STATUS_AINT BIT(4) |
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#define TCS3472_STATUS_AVALID BIT(0) |
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#define TCS3472_ENABLE_AIEN BIT(4) |
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#define TCS3472_ENABLE_AEN BIT(1) |
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#define TCS3472_ENABLE_PON BIT(0) |
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#define TCS3472_CONTROL_AGAIN_MASK (BIT(0) | BIT(1)) |
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struct tcs3472_data { |
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struct i2c_client *client; |
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struct mutex lock; |
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u16 low_thresh; |
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u16 high_thresh; |
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u8 enable; |
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u8 control; |
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u8 atime; |
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u8 apers; |
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u16 buffer[8]; /* 4 16-bit channels + 64-bit timestamp */ |
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}; |
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static const struct iio_event_spec tcs3472_events[] = { |
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{ |
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.type = IIO_EV_TYPE_THRESH, |
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.dir = IIO_EV_DIR_RISING, |
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.mask_separate = BIT(IIO_EV_INFO_VALUE), |
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}, { |
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.type = IIO_EV_TYPE_THRESH, |
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.dir = IIO_EV_DIR_FALLING, |
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.mask_separate = BIT(IIO_EV_INFO_VALUE), |
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}, { |
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.type = IIO_EV_TYPE_THRESH, |
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.dir = IIO_EV_DIR_EITHER, |
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.mask_separate = BIT(IIO_EV_INFO_ENABLE) | |
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BIT(IIO_EV_INFO_PERIOD), |
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}, |
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}; |
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#define TCS3472_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), \ |
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBSCALE) | \ |
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BIT(IIO_CHAN_INFO_INT_TIME), \ |
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.channel2 = IIO_MOD_LIGHT_##_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_CPU, \ |
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}, \ |
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.event_spec = _si ? NULL : tcs3472_events, \ |
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.num_event_specs = _si ? 0 : ARRAY_SIZE(tcs3472_events), \ |
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} |
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static const int tcs3472_agains[] = { 1, 4, 16, 60 }; |
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static const struct iio_chan_spec tcs3472_channels[] = { |
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TCS3472_CHANNEL(CLEAR, 0, TCS3472_CDATA), |
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TCS3472_CHANNEL(RED, 1, TCS3472_RDATA), |
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TCS3472_CHANNEL(GREEN, 2, TCS3472_GDATA), |
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TCS3472_CHANNEL(BLUE, 3, TCS3472_BDATA), |
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IIO_CHAN_SOFT_TIMESTAMP(4), |
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}; |
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static int tcs3472_req_data(struct tcs3472_data *data) |
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{ |
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int tries = 50; |
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int ret; |
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while (tries--) { |
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ret = i2c_smbus_read_byte_data(data->client, TCS3472_STATUS); |
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if (ret < 0) |
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return ret; |
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if (ret & TCS3472_STATUS_AVALID) |
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break; |
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msleep(20); |
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} |
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if (tries < 0) { |
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dev_err(&data->client->dev, "data not ready\n"); |
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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 tcs3472_read_raw(struct iio_dev *indio_dev, |
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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 tcs3472_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_RAW: |
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ret = iio_device_claim_direct_mode(indio_dev); |
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if (ret) |
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return ret; |
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ret = tcs3472_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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case IIO_CHAN_INFO_CALIBSCALE: |
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*val = tcs3472_agains[data->control & |
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TCS3472_CONTROL_AGAIN_MASK]; |
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return IIO_VAL_INT; |
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case IIO_CHAN_INFO_INT_TIME: |
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*val = 0; |
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*val2 = (256 - data->atime) * 2400; |
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return IIO_VAL_INT_PLUS_MICRO; |
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} |
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return -EINVAL; |
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} |
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static int tcs3472_write_raw(struct iio_dev *indio_dev, |
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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 tcs3472_data *data = iio_priv(indio_dev); |
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int i; |
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switch (mask) { |
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case IIO_CHAN_INFO_CALIBSCALE: |
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if (val2 != 0) |
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return -EINVAL; |
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for (i = 0; i < ARRAY_SIZE(tcs3472_agains); i++) { |
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if (val == tcs3472_agains[i]) { |
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data->control &= ~TCS3472_CONTROL_AGAIN_MASK; |
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data->control |= i; |
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return i2c_smbus_write_byte_data( |
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data->client, TCS3472_CONTROL, |
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data->control); |
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} |
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} |
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return -EINVAL; |
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case IIO_CHAN_INFO_INT_TIME: |
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if (val != 0) |
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return -EINVAL; |
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for (i = 0; i < 256; i++) { |
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if (val2 == (256 - i) * 2400) { |
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data->atime = i; |
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return i2c_smbus_write_byte_data( |
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data->client, TCS3472_ATIME, |
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data->atime); |
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} |
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} |
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return -EINVAL; |
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} |
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return -EINVAL; |
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} |
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/* |
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* Translation from APERS field value to the number of consecutive out-of-range |
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* clear channel values before an interrupt is generated |
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*/ |
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static const int tcs3472_intr_pers[] = { |
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0, 1, 2, 3, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60 |
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}; |
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static int tcs3472_read_event(struct iio_dev *indio_dev, |
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const struct iio_chan_spec *chan, enum iio_event_type type, |
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enum iio_event_direction dir, enum iio_event_info info, int *val, |
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int *val2) |
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{ |
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struct tcs3472_data *data = iio_priv(indio_dev); |
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int ret; |
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unsigned int period; |
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mutex_lock(&data->lock); |
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switch (info) { |
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case IIO_EV_INFO_VALUE: |
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*val = (dir == IIO_EV_DIR_RISING) ? |
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data->high_thresh : data->low_thresh; |
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ret = IIO_VAL_INT; |
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break; |
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case IIO_EV_INFO_PERIOD: |
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period = (256 - data->atime) * 2400 * |
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tcs3472_intr_pers[data->apers]; |
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*val = period / USEC_PER_SEC; |
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*val2 = period % USEC_PER_SEC; |
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ret = IIO_VAL_INT_PLUS_MICRO; |
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break; |
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default: |
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ret = -EINVAL; |
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break; |
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} |
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mutex_unlock(&data->lock); |
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return ret; |
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} |
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static int tcs3472_write_event(struct iio_dev *indio_dev, |
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const struct iio_chan_spec *chan, enum iio_event_type type, |
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enum iio_event_direction dir, enum iio_event_info info, int val, |
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int val2) |
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{ |
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struct tcs3472_data *data = iio_priv(indio_dev); |
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int ret; |
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u8 command; |
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int period; |
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int i; |
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mutex_lock(&data->lock); |
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switch (info) { |
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case IIO_EV_INFO_VALUE: |
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switch (dir) { |
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case IIO_EV_DIR_RISING: |
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command = TCS3472_AIHT; |
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break; |
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case IIO_EV_DIR_FALLING: |
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command = TCS3472_AILT; |
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break; |
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default: |
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ret = -EINVAL; |
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goto error; |
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} |
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ret = i2c_smbus_write_word_data(data->client, command, val); |
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if (ret) |
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goto error; |
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if (dir == IIO_EV_DIR_RISING) |
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data->high_thresh = val; |
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else |
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data->low_thresh = val; |
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break; |
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case IIO_EV_INFO_PERIOD: |
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period = val * USEC_PER_SEC + val2; |
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for (i = 1; i < ARRAY_SIZE(tcs3472_intr_pers) - 1; i++) { |
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if (period <= (256 - data->atime) * 2400 * |
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tcs3472_intr_pers[i]) |
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break; |
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} |
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ret = i2c_smbus_write_byte_data(data->client, TCS3472_PERS, i); |
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if (ret) |
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goto error; |
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data->apers = i; |
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break; |
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default: |
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ret = -EINVAL; |
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break; |
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} |
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error: |
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mutex_unlock(&data->lock); |
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return ret; |
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} |
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static int tcs3472_read_event_config(struct iio_dev *indio_dev, |
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const struct iio_chan_spec *chan, enum iio_event_type type, |
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enum iio_event_direction dir) |
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{ |
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struct tcs3472_data *data = iio_priv(indio_dev); |
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int ret; |
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mutex_lock(&data->lock); |
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ret = !!(data->enable & TCS3472_ENABLE_AIEN); |
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mutex_unlock(&data->lock); |
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return ret; |
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} |
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static int tcs3472_write_event_config(struct iio_dev *indio_dev, |
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const struct iio_chan_spec *chan, enum iio_event_type type, |
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enum iio_event_direction dir, int state) |
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{ |
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struct tcs3472_data *data = iio_priv(indio_dev); |
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int ret = 0; |
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u8 enable_old; |
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mutex_lock(&data->lock); |
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enable_old = data->enable; |
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if (state) |
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data->enable |= TCS3472_ENABLE_AIEN; |
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else |
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data->enable &= ~TCS3472_ENABLE_AIEN; |
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if (enable_old != data->enable) { |
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ret = i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE, |
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data->enable); |
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if (ret) |
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data->enable = enable_old; |
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} |
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mutex_unlock(&data->lock); |
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return ret; |
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} |
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static irqreturn_t tcs3472_event_handler(int irq, void *priv) |
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{ |
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struct iio_dev *indio_dev = priv; |
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struct tcs3472_data *data = iio_priv(indio_dev); |
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int ret; |
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ret = i2c_smbus_read_byte_data(data->client, TCS3472_STATUS); |
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if (ret >= 0 && (ret & TCS3472_STATUS_AINT)) { |
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iio_push_event(indio_dev, IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, 0, |
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IIO_EV_TYPE_THRESH, |
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IIO_EV_DIR_EITHER), |
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iio_get_time_ns(indio_dev)); |
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i2c_smbus_read_byte_data(data->client, TCS3472_INTR_CLEAR); |
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} |
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return IRQ_HANDLED; |
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} |
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static irqreturn_t tcs3472_trigger_handler(int irq, void *p) |
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{ |
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struct iio_poll_func *pf = p; |
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struct iio_dev *indio_dev = pf->indio_dev; |
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struct tcs3472_data *data = iio_priv(indio_dev); |
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int i, j = 0; |
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int ret = tcs3472_req_data(data); |
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if (ret < 0) |
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goto done; |
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for_each_set_bit(i, indio_dev->active_scan_mask, |
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indio_dev->masklength) { |
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ret = i2c_smbus_read_word_data(data->client, |
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TCS3472_CDATA + 2*i); |
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if (ret < 0) |
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goto done; |
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data->buffer[j++] = ret; |
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} |
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iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, |
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iio_get_time_ns(indio_dev)); |
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done: |
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iio_trigger_notify_done(indio_dev->trig); |
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return IRQ_HANDLED; |
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} |
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static ssize_t tcs3472_show_int_time_available(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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size_t len = 0; |
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int i; |
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for (i = 1; i <= 256; i++) |
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len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06d ", |
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2400 * i); |
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/* replace trailing space by newline */ |
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buf[len - 1] = '\n'; |
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return len; |
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} |
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static IIO_CONST_ATTR(calibscale_available, "1 4 16 60"); |
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static IIO_DEV_ATTR_INT_TIME_AVAIL(tcs3472_show_int_time_available); |
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static struct attribute *tcs3472_attributes[] = { |
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&iio_const_attr_calibscale_available.dev_attr.attr, |
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&iio_dev_attr_integration_time_available.dev_attr.attr, |
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NULL |
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}; |
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static const struct attribute_group tcs3472_attribute_group = { |
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.attrs = tcs3472_attributes, |
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}; |
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static const struct iio_info tcs3472_info = { |
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.read_raw = tcs3472_read_raw, |
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.write_raw = tcs3472_write_raw, |
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.read_event_value = tcs3472_read_event, |
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.write_event_value = tcs3472_write_event, |
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.read_event_config = tcs3472_read_event_config, |
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.write_event_config = tcs3472_write_event_config, |
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.attrs = &tcs3472_attribute_group, |
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}; |
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static int tcs3472_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct tcs3472_data *data; |
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struct iio_dev *indio_dev; |
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int ret; |
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); |
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if (indio_dev == NULL) |
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return -ENOMEM; |
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data = iio_priv(indio_dev); |
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i2c_set_clientdata(client, indio_dev); |
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data->client = client; |
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mutex_init(&data->lock); |
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indio_dev->info = &tcs3472_info; |
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indio_dev->name = TCS3472_DRV_NAME; |
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indio_dev->channels = tcs3472_channels; |
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indio_dev->num_channels = ARRAY_SIZE(tcs3472_channels); |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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ret = i2c_smbus_read_byte_data(data->client, TCS3472_ID); |
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if (ret < 0) |
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return ret; |
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|
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if (ret == 0x44) |
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dev_info(&client->dev, "TCS34721/34725 found\n"); |
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else if (ret == 0x4d) |
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dev_info(&client->dev, "TCS34723/34727 found\n"); |
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else |
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return -ENODEV; |
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ret = i2c_smbus_read_byte_data(data->client, TCS3472_CONTROL); |
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if (ret < 0) |
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return ret; |
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data->control = ret; |
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ret = i2c_smbus_read_byte_data(data->client, TCS3472_ATIME); |
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if (ret < 0) |
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return ret; |
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data->atime = ret; |
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ret = i2c_smbus_read_word_data(data->client, TCS3472_AILT); |
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if (ret < 0) |
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return ret; |
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data->low_thresh = ret; |
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ret = i2c_smbus_read_word_data(data->client, TCS3472_AIHT); |
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if (ret < 0) |
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return ret; |
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data->high_thresh = ret; |
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data->apers = 1; |
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ret = i2c_smbus_write_byte_data(data->client, TCS3472_PERS, |
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data->apers); |
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if (ret < 0) |
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return ret; |
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ret = i2c_smbus_read_byte_data(data->client, TCS3472_ENABLE); |
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if (ret < 0) |
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return ret; |
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|
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/* enable device */ |
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data->enable = ret | TCS3472_ENABLE_PON | TCS3472_ENABLE_AEN; |
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data->enable &= ~TCS3472_ENABLE_AIEN; |
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ret = i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE, |
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data->enable); |
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if (ret < 0) |
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return ret; |
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ret = iio_triggered_buffer_setup(indio_dev, NULL, |
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tcs3472_trigger_handler, NULL); |
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if (ret < 0) |
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return ret; |
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|
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if (client->irq) { |
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ret = request_threaded_irq(client->irq, NULL, |
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tcs3472_event_handler, |
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IRQF_TRIGGER_FALLING | IRQF_SHARED | |
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IRQF_ONESHOT, |
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client->name, indio_dev); |
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if (ret) |
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goto buffer_cleanup; |
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} |
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|
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ret = iio_device_register(indio_dev); |
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if (ret < 0) |
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goto free_irq; |
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|
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return 0; |
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|
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free_irq: |
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free_irq(client->irq, indio_dev); |
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buffer_cleanup: |
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iio_triggered_buffer_cleanup(indio_dev); |
|
return ret; |
|
} |
|
|
|
static int tcs3472_powerdown(struct tcs3472_data *data) |
|
{ |
|
int ret; |
|
u8 enable_mask = TCS3472_ENABLE_AEN | TCS3472_ENABLE_PON; |
|
|
|
mutex_lock(&data->lock); |
|
|
|
ret = i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE, |
|
data->enable & ~enable_mask); |
|
if (!ret) |
|
data->enable &= ~enable_mask; |
|
|
|
mutex_unlock(&data->lock); |
|
|
|
return ret; |
|
} |
|
|
|
static int tcs3472_remove(struct i2c_client *client) |
|
{ |
|
struct iio_dev *indio_dev = i2c_get_clientdata(client); |
|
|
|
iio_device_unregister(indio_dev); |
|
free_irq(client->irq, indio_dev); |
|
iio_triggered_buffer_cleanup(indio_dev); |
|
tcs3472_powerdown(iio_priv(indio_dev)); |
|
|
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_PM_SLEEP |
|
static int tcs3472_suspend(struct device *dev) |
|
{ |
|
struct tcs3472_data *data = iio_priv(i2c_get_clientdata( |
|
to_i2c_client(dev))); |
|
return tcs3472_powerdown(data); |
|
} |
|
|
|
static int tcs3472_resume(struct device *dev) |
|
{ |
|
struct tcs3472_data *data = iio_priv(i2c_get_clientdata( |
|
to_i2c_client(dev))); |
|
int ret; |
|
u8 enable_mask = TCS3472_ENABLE_AEN | TCS3472_ENABLE_PON; |
|
|
|
mutex_lock(&data->lock); |
|
|
|
ret = i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE, |
|
data->enable | enable_mask); |
|
if (!ret) |
|
data->enable |= enable_mask; |
|
|
|
mutex_unlock(&data->lock); |
|
|
|
return ret; |
|
} |
|
#endif |
|
|
|
static SIMPLE_DEV_PM_OPS(tcs3472_pm_ops, tcs3472_suspend, tcs3472_resume); |
|
|
|
static const struct i2c_device_id tcs3472_id[] = { |
|
{ "tcs3472", 0 }, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(i2c, tcs3472_id); |
|
|
|
static struct i2c_driver tcs3472_driver = { |
|
.driver = { |
|
.name = TCS3472_DRV_NAME, |
|
.pm = &tcs3472_pm_ops, |
|
}, |
|
.probe = tcs3472_probe, |
|
.remove = tcs3472_remove, |
|
.id_table = tcs3472_id, |
|
}; |
|
module_i2c_driver(tcs3472_driver); |
|
|
|
MODULE_AUTHOR("Peter Meerwald <[email protected]>"); |
|
MODULE_DESCRIPTION("TCS3472 color light sensors driver"); |
|
MODULE_LICENSE("GPL");
|
|
|