--- /dev/null
+/*
+ * tcs3414.c - Support for TAOS TCS3414 digital color sensor
+ *
+ * Copyright (c) 2014 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.
+ *
+ * Digital color sensor with 16-bit channels for red, green, blue, clear);
+ * 7-bit I2C slave address 0x39 (TCS3414) or 0x29, 0x49, 0x59 (TCS3413,
+ * TCS3415, TCS3416, resp.)
+ *
+ * TODO: sync, interrupt support, thresholds, prescaler
+ */
+
+#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 TCS3414_DRV_NAME "tcs3414"
+
+#define TCS3414_COMMAND BIT(7)
+#define TCS3414_COMMAND_WORD (TCS3414_COMMAND | BIT(5))
+
+#define TCS3414_CONTROL (TCS3414_COMMAND | 0x00)
+#define TCS3414_TIMING (TCS3414_COMMAND | 0x01)
+#define TCS3414_ID (TCS3414_COMMAND | 0x04)
+#define TCS3414_GAIN (TCS3414_COMMAND | 0x07)
+#define TCS3414_DATA_GREEN (TCS3414_COMMAND_WORD | 0x10)
+#define TCS3414_DATA_RED (TCS3414_COMMAND_WORD | 0x12)
+#define TCS3414_DATA_BLUE (TCS3414_COMMAND_WORD | 0x14)
+#define TCS3414_DATA_CLEAR (TCS3414_COMMAND_WORD | 0x16)
+
+#define TCS3414_CONTROL_ADC_VALID BIT(4)
+#define TCS3414_CONTROL_ADC_EN BIT(1)
+#define TCS3414_CONTROL_POWER BIT(0)
+
+#define TCS3414_INTEG_MASK GENMASK(1, 0)
+#define TCS3414_INTEG_12MS 0x0
+#define TCS3414_INTEG_100MS 0x1
+#define TCS3414_INTEG_400MS 0x2
+
+#define TCS3414_GAIN_MASK GENMASK(5, 4)
+#define TCS3414_GAIN_SHIFT 4
+
+struct tcs3414_data {
+ struct i2c_client *client;
+ struct mutex lock;
+ u8 control;
+ u8 gain;
+ u8 timing;
+ u16 buffer[8]; /* 4x 16-bit + 8 bytes timestamp */
+};
+
+#define TCS3414_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_SCALE) | \
+ 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, \
+ }, \
+}
+
+/* scale factors: 1/gain */
+static const int tcs3414_scales[][2] = {
+ {1, 0}, {0, 250000}, {0, 62500}, {0, 15625}
+};
+
+/* integration time in ms */
+static const int tcs3414_times[] = { 12, 100, 400 };
+
+static const struct iio_chan_spec tcs3414_channels[] = {
+ TCS3414_CHANNEL(GREEN, 0, TCS3414_DATA_GREEN),
+ TCS3414_CHANNEL(RED, 1, TCS3414_DATA_RED),
+ TCS3414_CHANNEL(BLUE, 2, TCS3414_DATA_BLUE),
+ TCS3414_CHANNEL(CLEAR, 3, TCS3414_DATA_CLEAR),
+ IIO_CHAN_SOFT_TIMESTAMP(4),
+};
+
+static int tcs3414_req_data(struct tcs3414_data *data)
+{
+ int tries = 25;
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
+ data->control | TCS3414_CONTROL_ADC_EN);
+ if (ret < 0)
+ return ret;
+
+ while (tries--) {
+ ret = i2c_smbus_read_byte_data(data->client, TCS3414_CONTROL);
+ if (ret < 0)
+ return ret;
+ if (ret & TCS3414_CONTROL_ADC_VALID)
+ break;
+ msleep(20);
+ }
+
+ ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
+ data->control);
+ if (ret < 0)
+ return ret;
+
+ if (tries < 0) {
+ dev_err(&data->client->dev, "data not ready\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int tcs3414_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct tcs3414_data *data = iio_priv(indio_dev);
+ int i, ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ if (iio_buffer_enabled(indio_dev))
+ return -EBUSY;
+ mutex_lock(&data->lock);
+ ret = tcs3414_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_SCALE:
+ i = (data->gain & TCS3414_GAIN_MASK) >> TCS3414_GAIN_SHIFT;
+ *val = tcs3414_scales[i][0];
+ *val2 = tcs3414_scales[i][1];
+ return IIO_VAL_INT_PLUS_MICRO;
+ case IIO_CHAN_INFO_INT_TIME:
+ *val = 0;
+ *val2 = tcs3414_times[data->timing & TCS3414_INTEG_MASK] * 1000;
+ return IIO_VAL_INT_PLUS_MICRO;
+ }
+ return -EINVAL;
+}
+
+static int tcs3414_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct tcs3414_data *data = iio_priv(indio_dev);
+ int i;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SCALE:
+ for (i = 0; i < ARRAY_SIZE(tcs3414_scales); i++) {
+ if (val == tcs3414_scales[i][0] &&
+ val2 == tcs3414_scales[i][1]) {
+ data->gain &= ~TCS3414_GAIN_MASK;
+ data->gain |= i << TCS3414_GAIN_SHIFT;
+ return i2c_smbus_write_byte_data(
+ data->client, TCS3414_GAIN,
+ data->gain);
+ }
+ }
+ return -EINVAL;
+ case IIO_CHAN_INFO_INT_TIME:
+ if (val != 0)
+ return -EINVAL;
+ for (i = 0; i < ARRAY_SIZE(tcs3414_times); i++) {
+ if (val == tcs3414_times[i] * 1000) {
+ data->timing &= ~TCS3414_INTEG_MASK;
+ data->timing |= i;
+ return i2c_smbus_write_byte_data(
+ data->client, TCS3414_TIMING,
+ data->timing);
+ }
+ }
+ return -EINVAL;
+ default:
+ return -EINVAL;
+ }
+}
+
+static irqreturn_t tcs3414_trigger_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct tcs3414_data *data = iio_priv(indio_dev);
+ int i, j = 0;
+
+ for_each_set_bit(i, indio_dev->active_scan_mask,
+ indio_dev->masklength) {
+ int ret = i2c_smbus_read_word_data(data->client,
+ TCS3414_DATA_GREEN + 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;
+}
+
+static IIO_CONST_ATTR(scale_available, "1 0.25 0.0625 0.015625");
+static IIO_CONST_ATTR_INT_TIME_AVAIL("0.012 0.1 0.4");
+
+static struct attribute *tcs3414_attributes[] = {
+ &iio_const_attr_scale_available.dev_attr.attr,
+ &iio_const_attr_integration_time_available.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group tcs3414_attribute_group = {
+ .attrs = tcs3414_attributes,
+};
+
+static const struct iio_info tcs3414_info = {
+ .read_raw = tcs3414_read_raw,
+ .write_raw = tcs3414_write_raw,
+ .attrs = &tcs3414_attribute_group,
+ .driver_module = THIS_MODULE,
+};
+
+static int tcs3414_buffer_preenable(struct iio_dev *indio_dev)
+{
+ struct tcs3414_data *data = iio_priv(indio_dev);
+
+ data->control |= TCS3414_CONTROL_ADC_EN;
+ return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
+ data->control);
+}
+
+static int tcs3414_buffer_predisable(struct iio_dev *indio_dev)
+{
+ struct tcs3414_data *data = iio_priv(indio_dev);
+ int ret;
+
+ ret = iio_triggered_buffer_predisable(indio_dev);
+ if (ret < 0)
+ return ret;
+
+ data->control &= ~TCS3414_CONTROL_ADC_EN;
+ return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
+ data->control);
+}
+
+static const struct iio_buffer_setup_ops tcs3414_buffer_setup_ops = {
+ .preenable = tcs3414_buffer_preenable,
+ .postenable = &iio_triggered_buffer_postenable,
+ .predisable = tcs3414_buffer_predisable,
+};
+
+static int tcs3414_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct tcs3414_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 = &tcs3414_info;
+ indio_dev->name = TCS3414_DRV_NAME;
+ indio_dev->channels = tcs3414_channels;
+ indio_dev->num_channels = ARRAY_SIZE(tcs3414_channels);
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ ret = i2c_smbus_read_byte_data(data->client, TCS3414_ID);
+ if (ret < 0)
+ return ret;
+
+ switch (ret & 0xf0) {
+ case 0x00:
+ dev_info(&client->dev, "TCS3404 found\n");
+ break;
+ case 0x10:
+ dev_info(&client->dev, "TCS3413/14/15/16 found\n");
+ break;
+ default:
+ return -ENODEV;
+ }
+
+ data->control = TCS3414_CONTROL_POWER;
+ ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
+ data->control);
+ if (ret < 0)
+ return ret;
+
+ data->timing = TCS3414_INTEG_12MS; /* free running */
+ ret = i2c_smbus_write_byte_data(data->client, TCS3414_TIMING,
+ data->timing);
+ if (ret < 0)
+ return ret;
+
+ ret = i2c_smbus_read_byte_data(data->client, TCS3414_GAIN);
+ if (ret < 0)
+ return ret;
+ data->gain = ret;
+
+ ret = iio_triggered_buffer_setup(indio_dev, NULL,
+ tcs3414_trigger_handler, &tcs3414_buffer_setup_ops);
+ 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;
+}
+
+static int tcs3414_powerdown(struct tcs3414_data *data)
+{
+ return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
+ data->control & ~(TCS3414_CONTROL_POWER |
+ TCS3414_CONTROL_ADC_EN));
+}
+
+static int tcs3414_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);
+ tcs3414_powerdown(iio_priv(indio_dev));
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int tcs3414_suspend(struct device *dev)
+{
+ struct tcs3414_data *data = iio_priv(i2c_get_clientdata(
+ to_i2c_client(dev)));
+ return tcs3414_powerdown(data);
+}
+
+static int tcs3414_resume(struct device *dev)
+{
+ struct tcs3414_data *data = iio_priv(i2c_get_clientdata(
+ to_i2c_client(dev)));
+ return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
+ data->control);
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(tcs3414_pm_ops, tcs3414_suspend, tcs3414_resume);
+
+static const struct i2c_device_id tcs3414_id[] = {
+ { "tcs3414", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, tcs3414_id);
+
+static struct i2c_driver tcs3414_driver = {
+ .driver = {
+ .name = TCS3414_DRV_NAME,
+ .pm = &tcs3414_pm_ops,
+ .owner = THIS_MODULE,
+ },
+ .probe = tcs3414_probe,
+ .remove = tcs3414_remove,
+ .id_table = tcs3414_id,
+};
+module_i2c_driver(tcs3414_driver);
+
+MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
+MODULE_DESCRIPTION("TCS3414 digital color sensors driver");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff