--- /dev/null
+/*
+ * tsl4531.c - Support for TAOS TSL4531 ambient light sensor
+ *
+ * Copyright 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.
+ *
+ * IIO driver for the TSL4531x family
+ * TSL45311/TSL45313: 7-bit I2C slave address 0x39
+ * TSL45315/TSL45317: 7-bit I2C slave address 0x29
+ *
+ * TODO: single cycle measurement
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#define TSL4531_DRV_NAME "tsl4531"
+
+#define TCS3472_COMMAND BIT(7)
+
+#define TSL4531_CONTROL (TCS3472_COMMAND | 0x00)
+#define TSL4531_CONFIG (TCS3472_COMMAND | 0x01)
+#define TSL4531_DATA (TCS3472_COMMAND | 0x04)
+#define TSL4531_ID (TCS3472_COMMAND | 0x0a)
+
+/* operating modes in control register */
+#define TSL4531_MODE_POWERDOWN 0x00
+#define TSL4531_MODE_SINGLE_ADC 0x02
+#define TSL4531_MODE_NORMAL 0x03
+
+/* integration time control in config register */
+#define TSL4531_TCNTRL_400MS 0x00
+#define TSL4531_TCNTRL_200MS 0x01
+#define TSL4531_TCNTRL_100MS 0x02
+
+/* part number in id register */
+#define TSL45311_ID 0x8
+#define TSL45313_ID 0x9
+#define TSL45315_ID 0xa
+#define TSL45317_ID 0xb
+#define TSL4531_ID_SHIFT 4
+
+struct tsl4531_data {
+ struct i2c_client *client;
+ struct mutex lock;
+ int int_time;
+};
+
+static IIO_CONST_ATTR_INT_TIME_AVAIL("0.1 0.2 0.4");
+
+static struct attribute *tsl4531_attributes[] = {
+ &iio_const_attr_integration_time_available.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group tsl4531_attribute_group = {
+ .attrs = tsl4531_attributes,
+};
+
+static const struct iio_chan_spec tsl4531_channels[] = {
+ {
+ .type = IIO_LIGHT,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_INT_TIME)
+ }
+};
+
+static int tsl4531_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct tsl4531_data *data = iio_priv(indio_dev);
+ int ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = i2c_smbus_read_word_data(data->client,
+ TSL4531_DATA);
+ if (ret < 0)
+ return ret;
+ *val = ret;
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ /* 0.. 1x, 1 .. 2x, 2 .. 4x */
+ *val = 1 << data->int_time;
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_INT_TIME:
+ if (data->int_time == 0)
+ *val2 = 400000;
+ else if (data->int_time == 1)
+ *val2 = 200000;
+ else if (data->int_time == 2)
+ *val2 = 100000;
+ else
+ return -EINVAL;
+ *val = 0;
+ return IIO_VAL_INT_PLUS_MICRO;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int tsl4531_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct tsl4531_data *data = iio_priv(indio_dev);
+ int int_time, ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_INT_TIME:
+ if (val != 0)
+ return -EINVAL;
+ if (val2 == 400000)
+ int_time = 0;
+ else if (val2 == 200000)
+ int_time = 1;
+ else if (val2 == 100000)
+ int_time = 2;
+ else
+ return -EINVAL;
+ mutex_lock(&data->lock);
+ ret = i2c_smbus_write_byte_data(data->client,
+ TSL4531_CONFIG, int_time);
+ if (ret >= 0)
+ data->int_time = int_time;
+ mutex_unlock(&data->lock);
+ return ret;
+ default:
+ return -EINVAL;
+ }
+}
+
+static const struct iio_info tsl4531_info = {
+ .read_raw = tsl4531_read_raw,
+ .write_raw = tsl4531_write_raw,
+ .attrs = &tsl4531_attribute_group,
+ .driver_module = THIS_MODULE,
+};
+
+static int tsl4531_check_id(struct i2c_client *client)
+{
+ int ret = i2c_smbus_read_byte_data(client, TSL4531_ID);
+ if (ret < 0)
+ return ret;
+
+ switch (ret >> TSL4531_ID_SHIFT) {
+ case TSL45311_ID:
+ case TSL45313_ID:
+ case TSL45315_ID:
+ case TSL45317_ID:
+ return 1;
+ default:
+ return 0;
+ }
+}
+
+static int tsl4531_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct tsl4531_data *data;
+ struct iio_dev *indio_dev;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ data = iio_priv(indio_dev);
+ i2c_set_clientdata(client, indio_dev);
+ data->client = client;
+ mutex_init(&data->lock);
+
+ if (!tsl4531_check_id(client)) {
+ dev_err(&client->dev, "no TSL4531 sensor\n");
+ return -ENODEV;
+ }
+
+ ret = i2c_smbus_write_byte_data(data->client, TSL4531_CONTROL,
+ TSL4531_MODE_NORMAL);
+ if (ret < 0)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(data->client, TSL4531_CONFIG,
+ TSL4531_TCNTRL_400MS);
+ if (ret < 0)
+ return ret;
+
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->info = &tsl4531_info;
+ indio_dev->channels = tsl4531_channels;
+ indio_dev->num_channels = ARRAY_SIZE(tsl4531_channels);
+ indio_dev->name = TSL4531_DRV_NAME;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ return iio_device_register(indio_dev);
+}
+
+static int tsl4531_powerdown(struct i2c_client *client)
+{
+ return i2c_smbus_write_byte_data(client, TSL4531_CONTROL,
+ TSL4531_MODE_POWERDOWN);
+}
+
+static int tsl4531_remove(struct i2c_client *client)
+{
+ iio_device_unregister(i2c_get_clientdata(client));
+ tsl4531_powerdown(client);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int tsl4531_suspend(struct device *dev)
+{
+ return tsl4531_powerdown(to_i2c_client(dev));
+}
+
+static int tsl4531_resume(struct device *dev)
+{
+ return i2c_smbus_write_byte_data(to_i2c_client(dev), TSL4531_CONTROL,
+ TSL4531_MODE_NORMAL);
+}
+
+static SIMPLE_DEV_PM_OPS(tsl4531_pm_ops, tsl4531_suspend, tsl4531_resume);
+#define TSL4531_PM_OPS (&tsl4531_pm_ops)
+#else
+#define TSL4531_PM_OPS NULL
+#endif
+
+static const struct i2c_device_id tsl4531_id[] = {
+ { "tsl4531", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, tsl4531_id);
+
+static struct i2c_driver tsl4531_driver = {
+ .driver = {
+ .name = TSL4531_DRV_NAME,
+ .pm = TSL4531_PM_OPS,
+ .owner = THIS_MODULE,
+ },
+ .probe = tsl4531_probe,
+ .remove = tsl4531_remove,
+ .id_table = tsl4531_id,
+};
+
+module_i2c_driver(tsl4531_driver);
+
+MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
+MODULE_DESCRIPTION("TAOS TSL4531 ambient light sensors driver");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff