iio: Add tsl4531 ambient light sensor driver

driver for the TSL4531 family of 16-bit I2C ambient light
sensors; information is here:
http://www.ams.com/eng/Products/Light-Sensors/Ambient-Light-Sensor-ALS/TSL45315

the chip offers simple lux output

v3 (thanks Lars-Peter Clausen):
* add mutex to when updating integration time
* fix chip ID checking
* code cleanups
v2:
* rename to tsl4351
* use INT_TIME

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
index bf9fa0d7aff9c26d0b4caf22bf25881de868c93d..488fff7cd80d9bbb55860caf8a50f20f76ed909b 100644 (file)
--- a/drivers/iio/light/Kconfig
+++ b/drivers/iio/light/Kconfig
@@ -65,6 +65,16 @@ config SENSORS_TSL2563
         This driver can also be built as a module.  If so, the module
         will be called tsl2563.
 
+config TSL4531
+       tristate "TAOS TSL4531 ambient light sensors"
+       depends on I2C
+       help
+        Say Y here if you want to build a driver for the TAOS TSL4531 family
+        of ambient light sensors with direct lux output.
+
+        To compile this driver as a module, choose M here: the
+        module will be called tsl4531.
+
 config VCNL4000
        tristate "VCNL4000 combined ALS and proximity sensor"
        depends on I2C

diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
index 354ee9ab2379a92ba73a486d399e0b243c594ea1..cd6f3cfe625952987956e0674b0f743e3d7cd4e2 100644 (file)
--- a/drivers/iio/light/Makefile
+++ b/drivers/iio/light/Makefile
@@ -8,4 +8,5 @@ obj-$(CONFIG_APDS9300)          += apds9300.o
 obj-$(CONFIG_HID_SENSOR_ALS)   += hid-sensor-als.o
 obj-$(CONFIG_SENSORS_LM3533)   += lm3533-als.o
 obj-$(CONFIG_SENSORS_TSL2563)  += tsl2563.o
+obj-$(CONFIG_TSL4531)          += tsl4531.o
 obj-$(CONFIG_VCNL4000)         += vcnl4000.o

diff --git a/drivers/iio/light/tsl4531.c b/drivers/iio/light/tsl4531.c
new file mode 100644 (file)
index 0000000..a15006e
--- /dev/null
+++ b/drivers/iio/light/tsl4531.c
@@ -0,0 +1,258 @@
+/*
+ * 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);
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(tsl4531_pm_ops, tsl4531_suspend, tsl4531_resume);
+
+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");