3 files changed, 259 insertions, 0 deletions

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 7362851a2ca8..477a9434b9c0 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -295,6 +295,16 @@ config ISL29003
           This driver can also be built as a module.  If so, the module
           will be called isl29003.
 
+config ISL29020
+        tristate "Intersil ISL29020 ambient light sensor"
+        depends on I2C
+        help
+          If you say yes here you get support for the Intersil ISL29020
+          ambient light sensor.
+
+          This driver can also be built as a module.  If so, the module
+          will be called isl29020.
+
 config SENSORS_TSL2550
         tristate "Taos TSL2550 ambient light sensor"
         depends on I2C && SYSFS
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 081b9fca8a06..2ecdd32d1357 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -26,6 +26,7 @@ obj-$(CONFIG_SGI_GRU)		+= sgi-gru/
 obj-$(CONFIG_CS5535_MFGPT)      += cs5535-mfgpt.o
 obj-$(CONFIG_HP_ILO)            += hpilo.o
 obj-$(CONFIG_ISL29003)          += isl29003.o
+obj-$(CONFIG_ISL29020)          += isl29020.o
 obj-$(CONFIG_SENSORS_TSL2550)   += tsl2550.o
 obj-$(CONFIG_EP93XX_PWM)        += ep93xx_pwm.o
 obj-$(CONFIG_DS1682)            += ds1682.o
diff --git a/drivers/misc/isl29020.c b/drivers/misc/isl29020.c
new file mode 100644
index 000000000000..34fe835921c4
--- /dev/null
+++ b/drivers/misc/isl29020.c
@@ -0,0 +1,248 @@
+/*
+ * isl29020.c - Intersil  ALS Driver
+ *
+ * Copyright (C) 2008 Intel Corp
+ *
+ *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * 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; version 2 of the License.
+ *
+ * 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.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * Data sheet at: http://www.intersil.com/data/fn/fn6505.pdf
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/sysfs.h>
+#include <linux/pm_runtime.h>
+
+static DEFINE_MUTEX(mutex);
+
+static ssize_t als_sensing_range_show(struct device *dev,
+                        struct device_attribute *attr,  char *buf)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        int  val;
+
+        val = i2c_smbus_read_byte_data(client, 0x00);
+
+        if (val < 0)
+                return val;
+        return sprintf(buf, "%d000\n", 1 << (2 * (val & 3)));
+
+}
+
+static ssize_t als_lux_input_data_show(struct device *dev,
+                        struct device_attribute *attr, char *buf)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        int ret_val, val;
+        unsigned long int lux;
+        int temp;
+
+        pm_runtime_get_sync(dev);
+        msleep(100);
+
+        mutex_lock(&mutex);
+        temp = i2c_smbus_read_byte_data(client, 0x02); /* MSB data */
+        if (temp < 0) {
+                pm_runtime_put_sync(dev);
+                mutex_unlock(&mutex);
+                return temp;
+        }
+
+        ret_val = i2c_smbus_read_byte_data(client, 0x01); /* LSB data */
+        mutex_unlock(&mutex);
+
+        if (ret_val < 0) {
+                pm_runtime_put_sync(dev);
+                return ret_val;
+        }
+
+        ret_val |= temp << 8;
+        val = i2c_smbus_read_byte_data(client, 0x00);
+        pm_runtime_put_sync(dev);
+        if (val < 0)
+                return val;
+        lux = ((((1 << (2 * (val & 3))))*1000) * ret_val) / 65536;
+        return sprintf(buf, "%ld\n", lux);
+}
+
+static ssize_t als_sensing_range_store(struct device *dev,
+                struct device_attribute *attr, const  char *buf, size_t count)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        unsigned int ret_val;
+        unsigned long val;
+
+        if (strict_strtoul(buf, 10, &val))
+                return -EINVAL;
+        if (val < 1 || val > 64000)
+                return -EINVAL;
+
+        /* Pick the smallest sensor range that will meet our requirements */
+        if (val <= 1000)
+                val = 1;
+        else if (val <= 4000)
+                val = 2;
+        else if (val <= 16000)
+                val = 3;
+        else
+                val = 4;
+
+        ret_val = i2c_smbus_read_byte_data(client, 0x00);
+
+        ret_val &= 0xFC; /*reset the bit before setting them */
+        ret_val |= val - 1;
+        ret_val = i2c_smbus_write_byte_data(client, 0x00, ret_val);
+
+        if (ret_val < 0)
+                return ret_val;
+        return count;
+}
+
+static void als_set_power_state(struct i2c_client *client, int enable)
+{
+        int ret_val;
+
+        ret_val = i2c_smbus_read_byte_data(client, 0x00);
+        if (ret_val < 0)
+                return;
+
+        if (enable)
+                ret_val |= 0x80;
+        else
+                ret_val &= 0x7F;
+
+        i2c_smbus_write_byte_data(client, 0x00, ret_val);
+}
+
+static DEVICE_ATTR(lux0_sensor_range, S_IRUGO | S_IWUSR,
+        als_sensing_range_show, als_sensing_range_store);
+static DEVICE_ATTR(lux0_input, S_IRUGO, als_lux_input_data_show, NULL);
+
+static struct attribute *mid_att_als[] = {
+        &dev_attr_lux0_sensor_range.attr,
+        &dev_attr_lux0_input.attr,
+        NULL
+};
+
+static struct attribute_group m_als_gr = {
+        .name = "isl29020",
+        .attrs = mid_att_als
+};
+
+static int als_set_default_config(struct i2c_client *client)
+{
+        int retval;
+
+        retval = i2c_smbus_write_byte_data(client, 0x00, 0xc0);
+        if (retval < 0) {
+                dev_err(&client->dev, "default write failed.");
+                return retval;
+        }
+        return 0;;
+}
+
+static int  isl29020_probe(struct i2c_client *client,
+                                        const struct i2c_device_id *id)
+{
+        int res;
+
+        res = als_set_default_config(client);
+        if (res <  0)
+                return res;
+
+        res = sysfs_create_group(&client->dev.kobj, &m_als_gr);
+        if (res) {
+                dev_err(&client->dev, "isl29020: device create file failed\n");
+                return res;
+        }
+        dev_info(&client->dev, "%s isl29020: ALS chip found\n", client->name);
+        als_set_power_state(client, 0);
+        pm_runtime_enable(&client->dev);
+        return res;
+}
+
+static int isl29020_remove(struct i2c_client *client)
+{
+        struct als_data *data = i2c_get_clientdata(client);
+        sysfs_remove_group(&client->dev.kobj, &m_als_gr);
+        kfree(data);
+        return 0;
+}
+
+static struct i2c_device_id isl29020_id[] = {
+        { "isl29020", 0 },
+        { }
+};
+
+MODULE_DEVICE_TABLE(i2c, isl29020_id);
+
+#ifdef CONFIG_PM
+
+static int isl29020_runtime_suspend(struct device *dev)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        als_set_power_state(client, 0);
+        return 0;
+}
+
+static int isl29020_runtime_resume(struct device *dev)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        als_set_power_state(client, 1);
+        return 0;
+}
+
+static const struct dev_pm_ops isl29020_pm_ops = {
+        .runtime_suspend = isl29020_runtime_suspend,
+        .runtime_resume = isl29020_runtime_resume,
+};
+
+#define ISL29020_PM_OPS (&isl29020_pm_ops)
+#else   /* CONFIG_PM */
+#define ISL29020_PM_OPS NULL
+#endif  /* CONFIG_PM */
+
+static struct i2c_driver isl29020_driver = {
+        .driver = {
+                .name = "isl29020",
+                .pm = ISL29020_PM_OPS,
+        },
+        .probe = isl29020_probe,
+        .remove = isl29020_remove,
+        .id_table = isl29020_id,
+};
+
+static int __init sensor_isl29020_init(void)
+{
+        return i2c_add_driver(&isl29020_driver);
+}
+
+static void  __exit sensor_isl29020_exit(void)
+{
+        i2c_del_driver(&isl29020_driver);
+}
+
+module_init(sensor_isl29020_init);
+module_exit(sensor_isl29020_exit);
+
+MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");
+MODULE_DESCRIPTION("Intersil isl29020 ALS Driver");
+MODULE_LICENSE("GPL v2");