--- /dev/null
+/*
+ * adjd_s311.c - Support for ADJD-S311-CR999 digital color sensor
+ *
+ * Copyright (C) 2012 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.
+ *
+ * driver for ADJD-S311-CR999 digital color sensor (10-bit channels for
+ * red, green, blue, clear); 7-bit I2C slave address 0x74
+ *
+ * limitations: no calibration, no offset mode, no sleep mode
+ */
+
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/bitmap.h>
+#include <linux/err.h>
+#include <linux/irq.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 ADJD_S311_DRV_NAME "adjd_s311"
+
+#define ADJD_S311_CTRL 0x00
+#define ADJD_S311_CONFIG 0x01
+#define ADJD_S311_CAP_RED 0x06
+#define ADJD_S311_CAP_GREEN 0x07
+#define ADJD_S311_CAP_BLUE 0x08
+#define ADJD_S311_CAP_CLEAR 0x09
+#define ADJD_S311_INT_RED 0x0a
+#define ADJD_S311_INT_GREEN 0x0c
+#define ADJD_S311_INT_BLUE 0x0e
+#define ADJD_S311_INT_CLEAR 0x10
+#define ADJD_S311_DATA_RED 0x40
+#define ADJD_S311_DATA_GREEN 0x42
+#define ADJD_S311_DATA_BLUE 0x44
+#define ADJD_S311_DATA_CLEAR 0x46
+#define ADJD_S311_OFFSET_RED 0x48
+#define ADJD_S311_OFFSET_GREEN 0x49
+#define ADJD_S311_OFFSET_BLUE 0x4a
+#define ADJD_S311_OFFSET_CLEAR 0x4b
+
+#define ADJD_S311_CTRL_GOFS 0x02
+#define ADJD_S311_CTRL_GSSR 0x01
+#define ADJD_S311_CAP_MASK 0x0f
+#define ADJD_S311_INT_MASK 0x0fff
+#define ADJD_S311_DATA_MASK 0x03ff
+
+struct adjd_s311_data {
+ struct i2c_client *client;
+ u16 *buffer;
+};
+
+enum adjd_s311_channel_idx {
+ IDX_RED, IDX_GREEN, IDX_BLUE, IDX_CLEAR
+};
+
+#define ADJD_S311_DATA_REG(chan) (ADJD_S311_DATA_RED + (chan) * 2)
+#define ADJD_S311_INT_REG(chan) (ADJD_S311_INT_RED + (chan) * 2)
+#define ADJD_S311_CAP_REG(chan) (ADJD_S311_CAP_RED + (chan))
+
+static int adjd_s311_req_data(struct iio_dev *indio_dev)
+{
+ struct adjd_s311_data *data = iio_priv(indio_dev);
+ int tries = 10;
+
+ int ret = i2c_smbus_write_byte_data(data->client, ADJD_S311_CTRL,
+ ADJD_S311_CTRL_GSSR);
+ if (ret < 0)
+ return ret;
+
+ while (tries--) {
+ ret = i2c_smbus_read_byte_data(data->client, ADJD_S311_CTRL);
+ if (ret < 0)
+ return ret;
+ if (!(ret & ADJD_S311_CTRL_GSSR))
+ break;
+ msleep(20);
+ }
+
+ if (tries < 0) {
+ dev_err(&data->client->dev,
+ "adjd_s311_req_data() failed, data not ready\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int adjd_s311_read_data(struct iio_dev *indio_dev, u8 reg, int *val)
+{
+ struct adjd_s311_data *data = iio_priv(indio_dev);
+
+ int ret = adjd_s311_req_data(indio_dev);
+ if (ret < 0)
+ return ret;
+
+ ret = i2c_smbus_read_word_data(data->client, reg);
+ if (ret < 0)
+ return ret;
+
+ *val = ret & ADJD_S311_DATA_MASK;
+
+ return 0;
+}
+
+static irqreturn_t adjd_s311_trigger_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct adjd_s311_data *data = iio_priv(indio_dev);
+ s64 time_ns = iio_get_time_ns();
+ int i, j = 0;
+
+ int ret = adjd_s311_req_data(indio_dev);
+ 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,
+ ADJD_S311_DATA_REG(i));
+ if (ret < 0)
+ goto done;
+
+ data->buffer[j++] = ret & ADJD_S311_DATA_MASK;
+ }
+
+ iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, time_ns);
+
+done:
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+
+#define ADJD_S311_CHANNEL(_color, _scan_idx) { \
+ .type = IIO_INTENSITY, \
+ .modified = 1, \
+ .address = (IDX_##_color), \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
+ BIT(IIO_CHAN_INFO_HARDWAREGAIN) | \
+ BIT(IIO_CHAN_INFO_INT_TIME), \
+ .channel2 = (IIO_MOD_LIGHT_##_color), \
+ .scan_index = (_scan_idx), \
+ .scan_type = { \
+ .sign = 'u', \
+ .realbits = 10, \
+ .storagebits = 16, \
+ .endianness = IIO_CPU, \
+ }, \
+}
+
+static const struct iio_chan_spec adjd_s311_channels[] = {
+ ADJD_S311_CHANNEL(RED, 0),
+ ADJD_S311_CHANNEL(GREEN, 1),
+ ADJD_S311_CHANNEL(BLUE, 2),
+ ADJD_S311_CHANNEL(CLEAR, 3),
+ IIO_CHAN_SOFT_TIMESTAMP(4),
+};
+
+static int adjd_s311_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct adjd_s311_data *data = iio_priv(indio_dev);
+ int ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = adjd_s311_read_data(indio_dev,
+ ADJD_S311_DATA_REG(chan->address), val);
+ if (ret < 0)
+ return ret;
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_HARDWAREGAIN:
+ ret = i2c_smbus_read_byte_data(data->client,
+ ADJD_S311_CAP_REG(chan->address));
+ if (ret < 0)
+ return ret;
+ *val = ret & ADJD_S311_CAP_MASK;
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_INT_TIME:
+ ret = i2c_smbus_read_word_data(data->client,
+ ADJD_S311_INT_REG(chan->address));
+ if (ret < 0)
+ return ret;
+ *val = 0;
+ /*
+ * not documented, based on measurement:
+ * 4095 LSBs correspond to roughly 4 ms
+ */
+ *val2 = ret & ADJD_S311_INT_MASK;
+ return IIO_VAL_INT_PLUS_MICRO;
+ }
+ return -EINVAL;
+}
+
+static int adjd_s311_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct adjd_s311_data *data = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_HARDWAREGAIN:
+ if (val < 0 || val > ADJD_S311_CAP_MASK)
+ return -EINVAL;
+
+ return i2c_smbus_write_byte_data(data->client,
+ ADJD_S311_CAP_REG(chan->address), val);
+ case IIO_CHAN_INFO_INT_TIME:
+ if (val != 0 || val2 < 0 || val2 > ADJD_S311_INT_MASK)
+ return -EINVAL;
+
+ return i2c_smbus_write_word_data(data->client,
+ ADJD_S311_INT_REG(chan->address), val2);
+ }
+ return -EINVAL;
+}
+
+static int adjd_s311_update_scan_mode(struct iio_dev *indio_dev,
+ const unsigned long *scan_mask)
+{
+ struct adjd_s311_data *data = iio_priv(indio_dev);
+
+ kfree(data->buffer);
+ data->buffer = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
+ if (data->buffer == NULL)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static const struct iio_info adjd_s311_info = {
+ .read_raw = adjd_s311_read_raw,
+ .write_raw = adjd_s311_write_raw,
+ .update_scan_mode = adjd_s311_update_scan_mode,
+ .driver_module = THIS_MODULE,
+};
+
+static int adjd_s311_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct adjd_s311_data *data;
+ struct iio_dev *indio_dev;
+ int err;
+
+ 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;
+
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->info = &adjd_s311_info;
+ indio_dev->name = ADJD_S311_DRV_NAME;
+ indio_dev->channels = adjd_s311_channels;
+ indio_dev->num_channels = ARRAY_SIZE(adjd_s311_channels);
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ err = iio_triggered_buffer_setup(indio_dev, NULL,
+ adjd_s311_trigger_handler, NULL);
+ if (err < 0)
+ return err;
+
+ err = iio_device_register(indio_dev);
+ if (err)
+ goto exit_unreg_buffer;
+
+ dev_info(&client->dev, "ADJD-S311 color sensor registered\n");
+
+ return 0;
+
+exit_unreg_buffer:
+ iio_triggered_buffer_cleanup(indio_dev);
+ return err;
+}
+
+static int adjd_s311_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+ struct adjd_s311_data *data = iio_priv(indio_dev);
+
+ iio_device_unregister(indio_dev);
+ iio_triggered_buffer_cleanup(indio_dev);
+ kfree(data->buffer);
+
+ return 0;
+}
+
+static const struct i2c_device_id adjd_s311_id[] = {
+ { "adjd_s311", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, adjd_s311_id);
+
+static struct i2c_driver adjd_s311_driver = {
+ .driver = {
+ .name = ADJD_S311_DRV_NAME,
+ },
+ .probe = adjd_s311_probe,
+ .remove = adjd_s311_remove,
+ .id_table = adjd_s311_id,
+};
+module_i2c_driver(adjd_s311_driver);
+
+MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
+MODULE_DESCRIPTION("ADJD-S311 color sensor");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff