![Gregor Boirie](/assets/img/avatar_default.png)
Adds a new per-device sysfs attribute "current_timestamp_clock" to allow userspace to select a particular POSIX clock for buffered samples and events timestamping. Following clocks, as listed in clock_gettime(2), are supported: CLOCK_REALTIME, CLOCK_MONOTONIC, CLOCK_MONOTONIC_RAW, CLOCK_REALTIME_COARSE, CLOCK_MONOTONIC_COARSE, CLOCK_BOOTTIME and CLOCK_TAI. Signed-off-by: Gregor Boirie <gregor.boirie@parrot.com> Acked-by: Sanchayan Maity <maitysanchayan@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
322 lines
7.8 KiB
C
322 lines
7.8 KiB
C
/*
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* adjd_s311.c - Support for ADJD-S311-CR999 digital color sensor
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*
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* Copyright (C) 2012 Peter Meerwald <pmeerw@pmeerw.net>
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*
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* This file is subject to the terms and conditions of version 2 of
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* the GNU General Public License. See the file COPYING in the main
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* directory of this archive for more details.
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*
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* driver for ADJD-S311-CR999 digital color sensor (10-bit channels for
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* red, green, blue, clear); 7-bit I2C slave address 0x74
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*
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* limitations: no calibration, no offset mode, no sleep mode
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*/
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/bitmap.h>
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#include <linux/err.h>
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#include <linux/irq.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/iio/trigger_consumer.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/triggered_buffer.h>
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#define ADJD_S311_DRV_NAME "adjd_s311"
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#define ADJD_S311_CTRL 0x00
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#define ADJD_S311_CONFIG 0x01
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#define ADJD_S311_CAP_RED 0x06
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#define ADJD_S311_CAP_GREEN 0x07
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#define ADJD_S311_CAP_BLUE 0x08
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#define ADJD_S311_CAP_CLEAR 0x09
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#define ADJD_S311_INT_RED 0x0a
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#define ADJD_S311_INT_GREEN 0x0c
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#define ADJD_S311_INT_BLUE 0x0e
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#define ADJD_S311_INT_CLEAR 0x10
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#define ADJD_S311_DATA_RED 0x40
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#define ADJD_S311_DATA_GREEN 0x42
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#define ADJD_S311_DATA_BLUE 0x44
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#define ADJD_S311_DATA_CLEAR 0x46
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#define ADJD_S311_OFFSET_RED 0x48
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#define ADJD_S311_OFFSET_GREEN 0x49
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#define ADJD_S311_OFFSET_BLUE 0x4a
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#define ADJD_S311_OFFSET_CLEAR 0x4b
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#define ADJD_S311_CTRL_GOFS 0x02
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#define ADJD_S311_CTRL_GSSR 0x01
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#define ADJD_S311_CAP_MASK 0x0f
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#define ADJD_S311_INT_MASK 0x0fff
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#define ADJD_S311_DATA_MASK 0x03ff
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struct adjd_s311_data {
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struct i2c_client *client;
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u16 *buffer;
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};
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enum adjd_s311_channel_idx {
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IDX_RED, IDX_GREEN, IDX_BLUE, IDX_CLEAR
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};
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#define ADJD_S311_DATA_REG(chan) (ADJD_S311_DATA_RED + (chan) * 2)
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#define ADJD_S311_INT_REG(chan) (ADJD_S311_INT_RED + (chan) * 2)
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#define ADJD_S311_CAP_REG(chan) (ADJD_S311_CAP_RED + (chan))
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static int adjd_s311_req_data(struct iio_dev *indio_dev)
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{
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struct adjd_s311_data *data = iio_priv(indio_dev);
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int tries = 10;
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int ret = i2c_smbus_write_byte_data(data->client, ADJD_S311_CTRL,
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ADJD_S311_CTRL_GSSR);
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if (ret < 0)
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return ret;
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while (tries--) {
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ret = i2c_smbus_read_byte_data(data->client, ADJD_S311_CTRL);
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if (ret < 0)
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return ret;
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if (!(ret & ADJD_S311_CTRL_GSSR))
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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,
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"adjd_s311_req_data() failed, 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 adjd_s311_read_data(struct iio_dev *indio_dev, u8 reg, int *val)
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{
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struct adjd_s311_data *data = iio_priv(indio_dev);
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int ret = adjd_s311_req_data(indio_dev);
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if (ret < 0)
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return ret;
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ret = i2c_smbus_read_word_data(data->client, reg);
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if (ret < 0)
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return ret;
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*val = ret & ADJD_S311_DATA_MASK;
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return 0;
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}
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static irqreturn_t adjd_s311_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 adjd_s311_data *data = iio_priv(indio_dev);
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s64 time_ns = iio_get_time_ns(indio_dev);
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int i, j = 0;
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int ret = adjd_s311_req_data(indio_dev);
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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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ADJD_S311_DATA_REG(i));
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if (ret < 0)
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goto done;
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data->buffer[j++] = ret & ADJD_S311_DATA_MASK;
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}
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iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, time_ns);
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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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#define ADJD_S311_CHANNEL(_color, _scan_idx) { \
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.type = IIO_INTENSITY, \
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.modified = 1, \
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.address = (IDX_##_color), \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
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BIT(IIO_CHAN_INFO_HARDWAREGAIN) | \
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BIT(IIO_CHAN_INFO_INT_TIME), \
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.channel2 = (IIO_MOD_LIGHT_##_color), \
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.scan_index = (_scan_idx), \
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.scan_type = { \
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.sign = 'u', \
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.realbits = 10, \
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.storagebits = 16, \
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.endianness = IIO_CPU, \
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}, \
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}
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static const struct iio_chan_spec adjd_s311_channels[] = {
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ADJD_S311_CHANNEL(RED, 0),
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ADJD_S311_CHANNEL(GREEN, 1),
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ADJD_S311_CHANNEL(BLUE, 2),
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ADJD_S311_CHANNEL(CLEAR, 3),
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IIO_CHAN_SOFT_TIMESTAMP(4),
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};
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static int adjd_s311_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 adjd_s311_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 = adjd_s311_read_data(indio_dev,
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ADJD_S311_DATA_REG(chan->address), val);
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if (ret < 0)
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return ret;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_HARDWAREGAIN:
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ret = i2c_smbus_read_byte_data(data->client,
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ADJD_S311_CAP_REG(chan->address));
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if (ret < 0)
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return ret;
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*val = ret & ADJD_S311_CAP_MASK;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_INT_TIME:
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ret = i2c_smbus_read_word_data(data->client,
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ADJD_S311_INT_REG(chan->address));
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if (ret < 0)
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return ret;
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*val = 0;
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/*
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* not documented, based on measurement:
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* 4095 LSBs correspond to roughly 4 ms
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*/
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*val2 = ret & ADJD_S311_INT_MASK;
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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 adjd_s311_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 adjd_s311_data *data = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_HARDWAREGAIN:
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if (val < 0 || val > ADJD_S311_CAP_MASK)
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return -EINVAL;
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return i2c_smbus_write_byte_data(data->client,
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ADJD_S311_CAP_REG(chan->address), val);
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case IIO_CHAN_INFO_INT_TIME:
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if (val != 0 || val2 < 0 || val2 > ADJD_S311_INT_MASK)
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return -EINVAL;
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return i2c_smbus_write_word_data(data->client,
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ADJD_S311_INT_REG(chan->address), val2);
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}
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return -EINVAL;
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}
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static int adjd_s311_update_scan_mode(struct iio_dev *indio_dev,
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const unsigned long *scan_mask)
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{
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struct adjd_s311_data *data = iio_priv(indio_dev);
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kfree(data->buffer);
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data->buffer = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
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if (data->buffer == NULL)
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return -ENOMEM;
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return 0;
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}
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static const struct iio_info adjd_s311_info = {
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.read_raw = adjd_s311_read_raw,
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.write_raw = adjd_s311_write_raw,
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.update_scan_mode = adjd_s311_update_scan_mode,
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.driver_module = THIS_MODULE,
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};
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static int adjd_s311_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct adjd_s311_data *data;
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struct iio_dev *indio_dev;
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int err;
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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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indio_dev->dev.parent = &client->dev;
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indio_dev->info = &adjd_s311_info;
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indio_dev->name = ADJD_S311_DRV_NAME;
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indio_dev->channels = adjd_s311_channels;
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indio_dev->num_channels = ARRAY_SIZE(adjd_s311_channels);
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indio_dev->modes = INDIO_DIRECT_MODE;
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err = iio_triggered_buffer_setup(indio_dev, NULL,
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adjd_s311_trigger_handler, NULL);
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if (err < 0)
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return err;
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err = iio_device_register(indio_dev);
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if (err)
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goto exit_unreg_buffer;
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dev_info(&client->dev, "ADJD-S311 color sensor registered\n");
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return 0;
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exit_unreg_buffer:
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iio_triggered_buffer_cleanup(indio_dev);
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return err;
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}
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static int adjd_s311_remove(struct i2c_client *client)
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{
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struct iio_dev *indio_dev = i2c_get_clientdata(client);
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struct adjd_s311_data *data = iio_priv(indio_dev);
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iio_device_unregister(indio_dev);
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iio_triggered_buffer_cleanup(indio_dev);
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kfree(data->buffer);
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return 0;
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}
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static const struct i2c_device_id adjd_s311_id[] = {
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{ "adjd_s311", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, adjd_s311_id);
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static struct i2c_driver adjd_s311_driver = {
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.driver = {
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.name = ADJD_S311_DRV_NAME,
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},
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.probe = adjd_s311_probe,
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.remove = adjd_s311_remove,
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.id_table = adjd_s311_id,
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};
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module_i2c_driver(adjd_s311_driver);
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MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
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MODULE_DESCRIPTION("ADJD-S311 color sensor");
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MODULE_LICENSE("GPL");
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