[PATCH 1/1] iio: light: Adding driver for ISL29018 ALS

rklein-DDmLM1+adcrQT0dZR+AlfA
2010-10-01T00:23:00Z

From: Rhyland Klein <rklein-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>

Adding support for the ISL 29018 ambient light and proximity sensor.

Signed-off-by: Rhyland Klein <rklein-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
---
drivers/staging/iio/light/Kconfig | 11 +
drivers/staging/iio/light/Makefile | 1 +
drivers/staging/iio/light/isl29018.c | 565 ++++++++++++++++++++++++++++++++++
3 files changed, 577 insertions(+), 0 deletions(-)
create mode 100755 drivers/staging/iio/light/isl29018.c

diff --git a/drivers/staging/iio/light/Kconfig b/drivers/staging/iio/light/Kconfig
index 80cb6e5..09113e4 100644
--- a/drivers/staging/iio/light/Kconfig
+++ b/drivers/staging/iio/light/Kconfig
@@ -13,3 +13,14 @@ config SENSORS_TSL2563
This driver can also be built as a module. If so, the module
will be called tsl2563.

+config SENSORS_ISL29018
+ tristate "ISL 29018 light and proximity sensor"
+ depends on I2C
+ default n
+ help
+ If you say yes here you get support for ambient light sensing and
+ proximity ir sensing from Intersil ISL29018.
+ This driver will provide the measurements of ambient light intensity
+ in lux, proximity infrared sensing and normal infrared sensing.
+ Data from sensor is accessible via sysfs.
+
diff --git a/drivers/staging/iio/light/Makefile b/drivers/staging/iio/light/Makefile
index 30f3300..9142c0e 100644
--- a/drivers/staging/iio/light/Makefile
+++ b/drivers/staging/iio/light/Makefile
@@ -3,3 +3,4 @@
#

obj-$(CONFIG_SENSORS_TSL2563) += tsl2563.o
+obj-$(CONFIG_SENSORS_ISL29018) += isl29018.o
diff --git a/drivers/staging/iio/light/isl29018.c b/drivers/staging/iio/light/isl29018.c
new file mode 100755
index 0000000..453a419
--- /dev/null
+++ b/drivers/staging/iio/light/isl29018.c
@@ -0,0 +1,565 @@
+/*
+ * A iio driver for the light sensor ISL 29018.
+ *
+ * IIO driver for monitoring ambient light intensity in luxi, proximity
+ * sensing and infrared sensing.
+ *
+ * Copyright (c) 2010, NVIDIA Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include "../iio.h"
+
+#define CONVERSION_TIME_MS 100
+
+#define ISL29018_REG_ADD_COMMAND1 0x00
+#define COMMMAND1_OPMODE_SHIFT 5
+#define COMMMAND1_OPMODE_MASK (7 << COMMMAND1_OPMODE_SHIFT)
+#define COMMMAND1_OPMODE_POWER_DOWN 0
+#define COMMMAND1_OPMODE_ALS_ONCE 1
+#define COMMMAND1_OPMODE_IR_ONCE 2
+#define COMMMAND1_OPMODE_PROX_ONCE 3
+
+#define ISL29018_REG_ADD_COMMANDII 0x01
+#define COMMANDII_RESOLUTION_SHIFT 2
+#define COMMANDII_RESOLUTION_MASK (0x3 << COMMANDII_RESOLUTION_SHIFT)
+
+#define COMMANDII_RANGE_SHIFT 0
+#define COMMANDII_RANGE_MASK (0x3 << COMMANDII_RANGE_SHIFT)
+
+#define COMMANDII_SCHEME_SHIFT 7
+#define COMMANDII_SCHEME_MASK (0x1 << COMMANDII_SCHEME_SHIFT)
+
+#define ISL29018_REG_ADD_DATA_LSB 0x02
+#define ISL29018_REG_ADD_DATA_MSB 0x03
+#define ISL29018_MAX_REGS ISL29018_REG_ADD_DATA_MSB
+
+struct isl29018_chip {
+ struct iio_dev *indio_dev;
+ struct i2c_client *client;
+ struct mutex lock;
+ unsigned int range;
+ unsigned int adc_bit;
+ int prox_scheme;
+ u8 reg_cache[ISL29018_MAX_REGS];
+};
+
+static int isl29018_write_data(struct i2c_client *client, u8 reg,
+ u8 val, u8 mask, u8 shift)
+{
+ u8 regval;
+ int ret = 0;
+ struct isl29018_chip *chip = i2c_get_clientdata(client);
+
+ regval = chip->reg_cache[reg];
+ regval &= ~mask;
+ regval |= val << shift;
+
+ ret = i2c_smbus_write_byte_data(client, reg, regval);
+ if (ret) {
+ dev_err(&client->dev, "Write to device fails status %x\n", ret);
+ return ret;
+ }
+ chip->reg_cache[reg] = regval;
+
+ return 0;
+}
+
+static int isl29018_set_range(struct i2c_client *client, unsigned long range,
+ unsigned int *new_range)
+{
+ unsigned long supp_ranges[] = {1000, 4000, 16000, 64000};
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(supp_ranges); ++i) {
+ if (range <= supp_ranges[i]) {
+ *new_range = (unsigned int)supp_ranges[i];
+ break;
+ }
+ }
+
+ if (i >= ARRAY_SIZE(supp_ranges))
+ return -EINVAL;
+
+ return isl29018_write_data(client, ISL29018_REG_ADD_COMMANDII,
+ i, COMMANDII_RANGE_MASK, COMMANDII_RANGE_SHIFT);
+}
+
+static int isl29018_set_resolution(struct i2c_client *client,
+ unsigned long adcbit, unsigned int *conf_adc_bit)
+{
+ unsigned long supp_adcbit[] = {16, 12, 8, 4};
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(supp_adcbit); ++i) {
+ if (adcbit >= supp_adcbit[i]) {
+ *conf_adc_bit = (unsigned int)supp_adcbit[i];
+ break;
+ }
+ }
+
+ if (i >= ARRAY_SIZE(supp_adcbit))
+ return -EINVAL;
+
+ return isl29018_write_data(client, ISL29018_REG_ADD_COMMANDII,
+ i, COMMANDII_RESOLUTION_MASK,
+ COMMANDII_RESOLUTION_SHIFT);
+}
+
+static int isl29018_read_sensor_input(struct i2c_client *client, int mode)
+{
+ int status;
+ int lsb;
+ int msb;
+
+ /* Set mode */
+ status = isl29018_write_data(client, ISL29018_REG_ADD_COMMAND1,
+ mode, COMMMAND1_OPMODE_MASK, COMMMAND1_OPMODE_SHIFT);
+ if (status) {
+ dev_err(&client->dev, "Error in setting operating mode\n");
+ return status;
+ }
+ msleep(CONVERSION_TIME_MS);
+ lsb = i2c_smbus_read_byte_data(client, ISL29018_REG_ADD_DATA_LSB);
+ if (lsb < 0) {
+ dev_err(&client->dev, "Error in reading LSB DATA\n");
+ return lsb;
+ }
+
+ msb = i2c_smbus_read_byte_data(client, ISL29018_REG_ADD_DATA_MSB);
+ if (msb < 0) {
+ dev_err(&client->dev, "Error in reading MSB DATA\n");
+ return msb;
+ }
+ dev_vdbg(&client->dev, "MSB 0x%x and LSB 0x%x\n", msb, lsb);
+
+ return (msb << 8) | lsb;
+}
+
+static int isl29018_read_lux(struct i2c_client *client, int *lux)
+{
+ int lux_data;
+ struct isl29018_chip *chip = i2c_get_clientdata(client);
+
+ lux_data = isl29018_read_sensor_input(client,
+ COMMMAND1_OPMODE_ALS_ONCE);
+
+ if (lux_data < 0)
+ return lux_data;
+
+ *lux = (lux_data * chip->range) >> chip->adc_bit;
+
+ return 0;
+}
+
+static int isl29018_read_ir(struct i2c_client *client, int *ir)
+{
+ int ir_data;
+
+ ir_data = isl29018_read_sensor_input(client, COMMMAND1_OPMODE_IR_ONCE);
+
+ if (ir_data < 0)
+ return ir_data;
+
+ *ir = ir_data;
+
+ return 0;
+}
+
+static int isl29018_read_proximity_ir(struct i2c_client *client, int scheme,
+ int *near_ir)
+{
+ int status;
+ int prox_data = -1;
+ int ir_data = -1;
+
+ /* Do proximity sensing with required scheme */
+ status = isl29018_write_data(client, ISL29018_REG_ADD_COMMANDII,
+ scheme, COMMANDII_SCHEME_MASK, COMMANDII_SCHEME_SHIFT);
+ if (status) {
+ dev_err(&client->dev, "Error in setting operating mode\n");
+ return status;
+ }
+
+ prox_data = isl29018_read_sensor_input(client,
+ COMMMAND1_OPMODE_PROX_ONCE);
+ if (prox_data < 0)
+ return prox_data;
+
+ if (scheme == 1) {
+ *near_ir = prox_data;
+ return 0;
+ }
+
+ ir_data = isl29018_read_sensor_input(client,
+ COMMMAND1_OPMODE_IR_ONCE);
+
+ if (ir_data < 0)
+ return ir_data;
+
+ if (prox_data >= ir_data)
+ *near_ir = prox_data - ir_data;
+ else
+ *near_ir = 0;
+
+ return 0;
+}
+
+static ssize_t get_sensor_data(struct device *dev, char *buf, int mode)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct isl29018_chip *chip = indio_dev->dev_data;
+ struct i2c_client *client = chip->client;
+ int value = 0;
+ int status;
+
+ mutex_lock(&chip->lock);
+ switch (mode) {
+ case COMMMAND1_OPMODE_PROX_ONCE:
+ status = isl29018_read_proximity_ir(client,
+ chip->prox_scheme, &value);
+ break;
+
+ case COMMMAND1_OPMODE_ALS_ONCE:
+ status = isl29018_read_lux(client, &value);
+ break;
+
+ case COMMMAND1_OPMODE_IR_ONCE:
+ status = isl29018_read_ir(client, &value);
+ break;
+
+ default:
+ dev_err(&client->dev, "Mode %d is not supported\n", mode);
+ mutex_unlock(&chip->lock);
+ return -EBUSY;
+ }
+ if (status < 0) {
+ dev_err(&client->dev, "Error in Reading data");
+ mutex_unlock(&chip->lock);
+ return status;
+ }
+
+ mutex_unlock(&chip->lock);
+
+ return sprintf(buf, "%d\n", value);
+}
+
+/* Sysfs interface */
+/* range */
+static ssize_t show_range(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct isl29018_chip *chip = indio_dev->dev_data;
+
+ dev_vdbg(dev, "%s()\n", __func__);
+
+ return sprintf(buf, "%u\n", chip->range);
+}
+
+static ssize_t store_range(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct isl29018_chip *chip = indio_dev->dev_data;
+ struct i2c_client *client = chip->client;
+ int status;
+ unsigned long lval;
+ unsigned int new_range;
+
+ dev_vdbg(dev, "%s()\n", __func__);
+
+ if (strict_strtoul(buf, 10, &lval))
+ return -EINVAL;
+
+ if (!(lval == 1000UL || lval == 4000UL ||
+ lval == 16000UL || lval == 64000UL)) {
+ dev_err(dev, "The range is not supported\n");
+ return -EINVAL;
+ }
+
+ mutex_lock(&chip->lock);
+ status = isl29018_set_range(client, lval, &new_range);
+ if (status < 0) {
+ mutex_unlock(&chip->lock);
+ dev_err(dev, "Error in setting max range\n");
+ return status;
+ }
+ chip->range = new_range;
+ mutex_unlock(&chip->lock);
+
+ return count;
+}
+
+/* resolution */
+static ssize_t show_resolution(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct isl29018_chip *chip = indio_dev->dev_data;
+
+ dev_vdbg(dev, "%s()\n", __func__);
+
+ return sprintf(buf, "%u\n", chip->adc_bit);
+}
+
+static ssize_t store_resolution(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct isl29018_chip *chip = indio_dev->dev_data;
+ struct i2c_client *client = chip->client;
+ int status;
+ unsigned long lval;
+ unsigned int new_adc_bit;
+
+ dev_vdbg(dev, "%s()\n", __func__);
+
+ if (strict_strtoul(buf, 10, &lval))
+ return -EINVAL;
+ if (!(lval == 4 || lval == 8 || lval == 12 || lval == 16)) {
+ dev_err(dev, "The resolution is not supported\n");
+ return -EINVAL;
+ }
+
+ mutex_lock(&chip->lock);
+ status = isl29018_set_resolution(client, lval, &new_adc_bit);
+ if (status < 0) {
+ mutex_unlock(&chip->lock);
+ dev_err(dev, "Error in setting resolution\n");
+ return status;
+ }
+ chip->adc_bit = new_adc_bit;
+ mutex_unlock(&chip->lock);
+
+ return count;
+}
+
+/* proximity scheme */
+static ssize_t show_prox_scheme(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct isl29018_chip *chip = indio_dev->dev_data;
+
+ dev_vdbg(dev, "%s()\n", __func__);
+
+ return sprintf(buf, "%d\n", chip->prox_scheme);
+}
+
+static ssize_t store_prox_scheme(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct isl29018_chip *chip = indio_dev->dev_data;
+ unsigned long lval;
+
+ dev_vdbg(dev, "%s()\n", __func__);
+
+ if (strict_strtoul(buf, 10, &lval))
+ return -EINVAL;
+ if (!(lval == 0UL || lval == 1UL)) {
+ dev_err(dev, "The scheme is not supported\n");
+ return -EINVAL;
+ }
+
+ mutex_lock(&chip->lock);
+ chip->prox_scheme = (int)lval;
+ mutex_unlock(&chip->lock);
+
+ return count;
+}
+
+/* Read lux */
+static ssize_t show_lux(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ return get_sensor_data(dev, buf, COMMMAND1_OPMODE_ALS_ONCE);
+}
+
+/* Read ir */
+static ssize_t show_ir(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ return get_sensor_data(dev, buf, COMMMAND1_OPMODE_IR_ONCE);
+}
+
+/* Read nearest ir */
+static ssize_t show_proxim_ir(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ return get_sensor_data(dev, buf, COMMMAND1_OPMODE_PROX_ONCE);
+}
+
+/* Read name */
+static ssize_t show_name(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct isl29018_chip *chip = indio_dev->dev_data;
+
+ return sprintf(buf, "%s\n", chip->client->name);
+}
+
+static IIO_DEVICE_ATTR(range, S_IRUGO | S_IWUSR, show_range, store_range, 0);
+static IIO_DEVICE_ATTR(resolution, S_IRUGO | S_IWUSR,
+ show_resolution, store_resolution, 0);
+static IIO_DEVICE_ATTR(proximity_scheme, S_IRUGO | S_IWUSR,
+ show_prox_scheme, store_prox_scheme, 0);
+static IIO_DEVICE_ATTR(lux, S_IRUGO, show_lux, NULL, 0);
+static IIO_DEVICE_ATTR(ir, S_IRUGO, show_ir, NULL, 0);
+static IIO_DEVICE_ATTR(proxim_ir, S_IRUGO, show_proxim_ir, NULL, 0);
+static IIO_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
+
+static struct attribute *isl29018_attributes[] = {
+ &iio_dev_attr_name.dev_attr.attr,
+ &iio_dev_attr_range.dev_attr.attr,
+ &iio_dev_attr_resolution.dev_attr.attr,
+ &iio_dev_attr_proximity_scheme.dev_attr.attr,
+ &iio_dev_attr_lux.dev_attr.attr,
+ &iio_dev_attr_ir.dev_attr.attr,
+ &iio_dev_attr_proxim_ir.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group isl29108_group = {
+ .attrs = isl29018_attributes,
+};
+
+static int isl29018_chip_init(struct i2c_client *client)
+{
+ struct isl29018_chip *chip = i2c_get_clientdata(client);
+ int status;
+ int i;
+ int new_adc_bit;
+ unsigned int new_range;
+
+ for (i = 0; i < ARRAY_SIZE(chip->reg_cache); i++)
+ chip->reg_cache[i] = 0;
+
+ /* set defaults */
+ status = isl29018_set_range(client, chip->range, &new_range);
+ if (status < 0) {
+ dev_err(&client->dev, "Init of isl29018 fails\n");
+ return status;
+ }
+
+ status = isl29018_set_resolution(client, chip->adc_bit,
+ &new_adc_bit);
+
+ return 0;
+}
+
+static int __devinit isl29018_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct isl29018_chip *chip;
+ int err;
+
+ chip = kzalloc(sizeof(struct isl29018_chip), GFP_KERNEL);
+ if (!chip) {
+ dev_err(&client->dev, "Memory allocation fails\n");
+ err = -ENOMEM;
+ goto exit;
+ }
+
+ i2c_set_clientdata(client, chip);
+ chip->client = client;
+
+ mutex_init(&chip->lock);
+
+ chip->range = 1000;
+ chip->adc_bit = 16;
+
+ err = isl29018_chip_init(client);
+ if (err)
+ goto exit_free;
+
+ chip->indio_dev = iio_allocate_device();
+ if (!chip->indio_dev) {
+ dev_err(&client->dev, "iio allocation fails\n");
+ goto exit_free;
+ }
+ chip->indio_dev->attrs = &isl29108_group;
+ chip->indio_dev->dev.parent = &client->dev;
+ chip->indio_dev->dev_data = (void *)(chip);
+ chip->indio_dev->driver_module = THIS_MODULE;
+ chip->indio_dev->modes = INDIO_DIRECT_MODE;
+ err = iio_device_register(chip->indio_dev);
+ if (err) {
+ dev_err(&client->dev, "iio registration fails\n");
+ goto exit_iio_free;
+ }
+
+ return 0;
+exit_iio_free:
+ iio_free_device(chip->indio_dev);
+exit_free:
+ kfree(chip);
+exit:
+ return err;
+}
+
+static int __devexit isl29018_remove(struct i2c_client *client)
+{
+ struct isl29018_chip *chip = i2c_get_clientdata(client);
+
+ dev_dbg(&client->dev, "%s()\n", __func__);
+ iio_device_unregister(chip->indio_dev);
+ kfree(chip);
+
+ return 0;
+}
+
+static const struct i2c_device_id isl29018_id[] = {
+ {"isl29018", 0},
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, isl29018_id);
+
+static struct i2c_driver isl29018_driver = {
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = "isl29018",
+ .owner = THIS_MODULE,
+ },
+ .probe = isl29018_probe,
+ .remove = __devexit_p(isl29018_remove),
+ .id_table = isl29018_id,
+};
+
+static int __init isl29018_init(void)
+{
+ return i2c_add_driver(&isl29018_driver);
+}
+
+static void __exit isl29018_exit(void)
+{
+ i2c_del_driver(&isl29018_driver);
+}
+
+module_init(isl29018_init);
+module_exit(isl29018_exit);
+
+MODULE_DESCRIPTION("ISL29018 Ambient Light Sensor driver");
+MODULE_LICENSE("GPL");
--
1.7.0.4