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Release 4.7 drivers/iio/light/tcs3472.c

/*
 * tcs3472.c - Support for TAOS TCS3472 color light-to-digital converter
 *
 * Copyright (c) 2013 Peter Meerwald <pmeerw@pmeerw.net>
 *
 * This file is subject to the terms and conditions of version 2 of
 * the GNU General Public License.  See the file COPYING in the main
 * directory of this archive for more details.
 *
 * Color light sensor with 16-bit channels for red, green, blue, clear);
 * 7-bit I2C slave address 0x39 (TCS34721, TCS34723) or 0x29 (TCS34725,
 * TCS34727)
 *
 * TODO: interrupt support, thresholds, wait time
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/pm.h>

#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/buffer.h>
#include <linux/iio/triggered_buffer.h>


#define TCS3472_DRV_NAME "tcs3472"


#define TCS3472_COMMAND BIT(7)

#define TCS3472_AUTO_INCR BIT(5)


#define TCS3472_ENABLE (TCS3472_COMMAND | 0x00)

#define TCS3472_ATIME (TCS3472_COMMAND | 0x01)

#define TCS3472_WTIME (TCS3472_COMMAND | 0x03)

#define TCS3472_AILT (TCS3472_COMMAND | 0x04)

#define TCS3472_AIHT (TCS3472_COMMAND | 0x06)

#define TCS3472_PERS (TCS3472_COMMAND | 0x0c)

#define TCS3472_CONFIG (TCS3472_COMMAND | 0x0d)

#define TCS3472_CONTROL (TCS3472_COMMAND | 0x0f)

#define TCS3472_ID (TCS3472_COMMAND | 0x12)

#define TCS3472_STATUS (TCS3472_COMMAND | 0x13)

#define TCS3472_CDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x14)

#define TCS3472_RDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x16)

#define TCS3472_GDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x18)

#define TCS3472_BDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x1a)


#define TCS3472_STATUS_AVALID BIT(0)

#define TCS3472_ENABLE_AEN BIT(1)

#define TCS3472_ENABLE_PON BIT(0)

#define TCS3472_CONTROL_AGAIN_MASK (BIT(0) | BIT(1))


struct tcs3472_data {
	
struct i2c_client *client;
	
struct mutex lock;
	
u8 enable;
	
u8 control;
	
u8 atime;
	
u16 buffer[8]; /* 4 16-bit channels + 64-bit timestamp */
};


#define TCS3472_CHANNEL(_color, _si, _addr) { \
        .type = IIO_INTENSITY, \
        .modified = 1, \
        .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
        .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBSCALE) | \
                BIT(IIO_CHAN_INFO_INT_TIME), \
        .channel2 = IIO_MOD_LIGHT_##_color, \
        .address = _addr, \
        .scan_index = _si, \
        .scan_type = { \
                .sign = 'u', \
                .realbits = 16, \
                .storagebits = 16, \
                .endianness = IIO_CPU, \
        }, \
}


static const int tcs3472_agains[] = { 1, 4, 16, 60 };


static const struct iio_chan_spec tcs3472_channels[] = {
	TCS3472_CHANNEL(CLEAR, 0, TCS3472_CDATA),
	TCS3472_CHANNEL(RED, 1, TCS3472_RDATA),
	TCS3472_CHANNEL(GREEN, 2, TCS3472_GDATA),
	TCS3472_CHANNEL(BLUE, 3, TCS3472_BDATA),
	IIO_CHAN_SOFT_TIMESTAMP(4),
};


static int tcs3472_req_data(struct tcs3472_data *data) { int tries = 50; int ret; while (tries--) { ret = i2c_smbus_read_byte_data(data->client, TCS3472_STATUS); if (ret < 0) return ret; if (ret & TCS3472_STATUS_AVALID) break; msleep(20); } if (tries < 0) { dev_err(&data->client->dev, "data not ready\n"); return -EIO; } return 0; }

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static int tcs3472_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { struct tcs3472_data *data = iio_priv(indio_dev); int ret; switch (mask) { case IIO_CHAN_INFO_RAW: if (iio_buffer_enabled(indio_dev)) return -EBUSY; mutex_lock(&data->lock); ret = tcs3472_req_data(data); if (ret < 0) { mutex_unlock(&data->lock); return ret; } ret = i2c_smbus_read_word_data(data->client, chan->address); mutex_unlock(&data->lock); if (ret < 0) return ret; *val = ret; return IIO_VAL_INT; case IIO_CHAN_INFO_CALIBSCALE: *val = tcs3472_agains[data->control & TCS3472_CONTROL_AGAIN_MASK]; return IIO_VAL_INT; case IIO_CHAN_INFO_INT_TIME: *val = 0; *val2 = (256 - data->atime) * 2400; return IIO_VAL_INT_PLUS_MICRO; } return -EINVAL; }

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static int tcs3472_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { struct tcs3472_data *data = iio_priv(indio_dev); int i; switch (mask) { case IIO_CHAN_INFO_CALIBSCALE: if (val2 != 0) return -EINVAL; for (i = 0; i < ARRAY_SIZE(tcs3472_agains); i++) { if (val == tcs3472_agains[i]) { data->control &= ~TCS3472_CONTROL_AGAIN_MASK; data->control |= i; return i2c_smbus_write_byte_data( data->client, TCS3472_CONTROL, data->control); } } return -EINVAL; case IIO_CHAN_INFO_INT_TIME: if (val != 0) return -EINVAL; for (i = 0; i < 256; i++) { if (val2 == (256 - i) * 2400) { data->atime = i; return i2c_smbus_write_word_data( data->client, TCS3472_ATIME, data->atime); } } return -EINVAL; } return -EINVAL; }

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static irqreturn_t tcs3472_trigger_handler(int irq, void *p) { struct iio_poll_func *pf = p; struct iio_dev *indio_dev = pf->indio_dev; struct tcs3472_data *data = iio_priv(indio_dev); int i, j = 0; int ret = tcs3472_req_data(data); if (ret < 0) goto done; for_each_set_bit(i, indio_dev->active_scan_mask, indio_dev->masklength) { ret = i2c_smbus_read_word_data(data->client, TCS3472_CDATA + 2*i); if (ret < 0) goto done; data->buffer[j++] = ret; } iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, iio_get_time_ns()); done: iio_trigger_notify_done(indio_dev->trig); return IRQ_HANDLED; }

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static ssize_t tcs3472_show_int_time_available(struct device *dev, struct device_attribute *attr, char *buf) { size_t len = 0; int i; for (i = 1; i <= 256; i++) len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06d ", 2400 * i); /* replace trailing space by newline */ buf[len - 1] = '\n'; return len; }

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static IIO_CONST_ATTR(calibscale_available, "1 4 16 60"); static IIO_DEV_ATTR_INT_TIME_AVAIL(tcs3472_show_int_time_available); static struct attribute *tcs3472_attributes[] = { &iio_const_attr_calibscale_available.dev_attr.attr, &iio_dev_attr_integration_time_available.dev_attr.attr, NULL }; static const struct attribute_group tcs3472_attribute_group = { .attrs = tcs3472_attributes, }; static const struct iio_info tcs3472_info = { .read_raw = tcs3472_read_raw, .write_raw = tcs3472_write_raw, .attrs = &tcs3472_attribute_group, .driver_module = THIS_MODULE, };
static int tcs3472_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct tcs3472_data *data; struct iio_dev *indio_dev; int ret; indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); if (indio_dev == NULL) return -ENOMEM; data = iio_priv(indio_dev); i2c_set_clientdata(client, indio_dev); data->client = client; mutex_init(&data->lock); indio_dev->dev.parent = &client->dev; indio_dev->info = &tcs3472_info; indio_dev->name = TCS3472_DRV_NAME; indio_dev->channels = tcs3472_channels; indio_dev->num_channels = ARRAY_SIZE(tcs3472_channels); indio_dev->modes = INDIO_DIRECT_MODE; ret = i2c_smbus_read_byte_data(data->client, TCS3472_ID); if (ret < 0) return ret; if (ret == 0x44) dev_info(&client->dev, "TCS34721/34725 found\n"); else if (ret == 0x4d) dev_info(&client->dev, "TCS34723/34727 found\n"); else return -ENODEV; ret = i2c_smbus_read_byte_data(data->client, TCS3472_CONTROL); if (ret < 0) return ret; data->control = ret; ret = i2c_smbus_read_byte_data(data->client, TCS3472_ATIME); if (ret < 0) return ret; data->atime = ret; ret = i2c_smbus_read_byte_data(data->client, TCS3472_ENABLE); if (ret < 0) return ret; /* enable device */ data->enable = ret | TCS3472_ENABLE_PON | TCS3472_ENABLE_AEN; ret = i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE, data->enable); if (ret < 0) return ret; ret = iio_triggered_buffer_setup(indio_dev, NULL, tcs3472_trigger_handler, NULL); if (ret < 0) return ret; ret = iio_device_register(indio_dev); if (ret < 0) goto buffer_cleanup; return 0; buffer_cleanup: iio_triggered_buffer_cleanup(indio_dev); return ret; }

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static int tcs3472_powerdown(struct tcs3472_data *data) { return i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE, data->enable & ~(TCS3472_ENABLE_AEN | TCS3472_ENABLE_PON)); }

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static int tcs3472_remove(struct i2c_client *client) { struct iio_dev *indio_dev = i2c_get_clientdata(client); iio_device_unregister(indio_dev); iio_triggered_buffer_cleanup(indio_dev); tcs3472_powerdown(iio_priv(indio_dev)); return 0; }

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#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); }

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static int tcs3472_resume(struct device *dev) { struct tcs3472_data *data = iio_priv(i2c_get_clientdata( to_i2c_client(dev))); return i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE, data->enable | (TCS3472_ENABLE_AEN | TCS3472_ENABLE_PON)); }

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#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 <pmeerw@pmeerw.net>"); MODULE_DESCRIPTION("TCS3472 color light sensors driver"); MODULE_LICENSE("GPL");

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