1 files changed, 349 insertions, 0 deletions

diff --git a/drivers/misc/apds9802als.c b/drivers/misc/apds9802als.c
new file mode 100644
index 000000000000..81db7811cf68
--- /dev/null
+++ b/drivers/misc/apds9802als.c
@@ -0,0 +1,349 @@
+/*
+ * apds9802als.c - apds9802  ALS Driver
+ *
+ * Copyright (C) 2009 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.
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ */
+
+#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/mutex.h>
+#include <linux/sysfs.h>
+#include <linux/pm_runtime.h>
+
+#define ALS_MIN_RANGE_VAL 1
+#define ALS_MAX_RANGE_VAL 2
+#define POWER_STA_ENABLE 1
+#define POWER_STA_DISABLE 0
+
+#define DRIVER_NAME "apds9802als"
+
+struct als_data {
+        struct 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, 0x81);
+        if (val < 0)
+                return val;
+        if (val & 1)
+                return sprintf(buf, "4095\n");
+        else
+                return sprintf(buf, "65535\n");
+}
+
+static int als_wait_for_data_ready(struct device *dev)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        int ret;
+        int retry = 10;
+
+        do {
+                msleep(30);
+                ret = i2c_smbus_read_byte_data(client, 0x86);
+        } while (!(ret & 0x80) && retry--);
+
+        if (!retry) {
+                dev_warn(dev, "timeout waiting for data ready\n");
+                return -ETIMEDOUT;
+        }
+
+        return 0;
+}
+
+static ssize_t als_lux0_input_data_show(struct device *dev,
+                        struct device_attribute *attr, char *buf)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct als_data *data = i2c_get_clientdata(client);
+        int ret_val;
+        int temp;
+
+        /* Protect against parallel reads */
+        pm_runtime_get_sync(dev);
+        mutex_lock(&data->mutex);
+
+        /* clear EOC interrupt status */
+        i2c_smbus_write_byte(client, 0x40);
+        /* start measurement */
+        temp = i2c_smbus_read_byte_data(client, 0x81);
+        i2c_smbus_write_byte_data(client, 0x81, temp | 0x08);
+
+        ret_val = als_wait_for_data_ready(dev);
+        if (ret_val < 0)
+                goto failed;
+
+        temp = i2c_smbus_read_byte_data(client, 0x8C); /* LSB data */
+        if (temp < 0) {
+                ret_val = temp;
+                goto failed;
+        }
+        ret_val = i2c_smbus_read_byte_data(client, 0x8D); /* MSB data */
+        if (ret_val < 0)
+                goto failed;
+
+        mutex_unlock(&data->mutex);
+        pm_runtime_put_sync(dev);
+
+        temp = (ret_val << 8) | temp;
+        return sprintf(buf, "%d\n", temp);
+failed:
+        mutex_unlock(&data->mutex);
+        pm_runtime_put_sync(dev);
+        return ret_val;
+}
+
+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);
+        struct als_data *data = i2c_get_clientdata(client);
+        int ret_val;
+        unsigned long val;
+
+        if (strict_strtoul(buf, 10, &val))
+                return -EINVAL;
+
+        if (val < 4096)
+                val = 1;
+        else if (val < 65536)
+                val = 2;
+        else
+                return -ERANGE;
+
+        pm_runtime_get_sync(dev);
+
+        /* Make sure nobody else reads/modifies/writes 0x81 while we
+           are active */
+        mutex_lock(&data->mutex);
+
+        ret_val = i2c_smbus_read_byte_data(client, 0x81);
+        if (ret_val < 0)
+                goto fail;
+
+        /* Reset the bits before setting them */
+        ret_val = ret_val & 0xFA;
+
+        if (val == 1) /* Setting detection range up to 4k LUX */
+                ret_val = (ret_val | 0x01);
+        else /* Setting detection range up to 64k LUX*/
+                ret_val = (ret_val | 0x00);
+
+        ret_val = i2c_smbus_write_byte_data(client, 0x81, ret_val);
+
+        if (ret_val >= 0) {
+                /* All OK */
+                mutex_unlock(&data->mutex);
+                pm_runtime_put_sync(dev);
+                return count;
+        }
+fail:
+        mutex_unlock(&data->mutex);
+        pm_runtime_put_sync(dev);
+        return ret_val;
+}
+
+static int als_set_power_state(struct i2c_client *client, bool on_off)
+{
+        int ret_val;
+        struct als_data *data = i2c_get_clientdata(client);
+
+        mutex_lock(&data->mutex);
+        ret_val = i2c_smbus_read_byte_data(client, 0x80);
+        if (ret_val < 0)
+                goto fail;
+        if (on_off)
+                ret_val = ret_val | 0x01;
+        else
+                ret_val = ret_val & 0xFE;
+        ret_val = i2c_smbus_write_byte_data(client, 0x80, ret_val);
+fail:
+        mutex_unlock(&data->mutex);
+        return 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_lux0_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 = "apds9802als",
+        .attrs = mid_att_als
+};
+
+static int als_set_default_config(struct i2c_client *client)
+{
+        int ret_val;
+        /* Write the command and then switch on */
+        ret_val = i2c_smbus_write_byte_data(client, 0x80, 0x01);
+        if (ret_val < 0) {
+                dev_err(&client->dev, "failed default switch on write\n");
+                return ret_val;
+        }
+        /* detection range: 1~64K Lux, maunal measurement */
+        ret_val = i2c_smbus_write_byte_data(client, 0x81, 0x08);
+        if (ret_val < 0)
+                dev_err(&client->dev, "failed default LUX on write\n");
+
+        /*  We always get 0 for the 1st measurement after system power on,
+         *  so make sure it is finished before user asks for data.
+         */
+        als_wait_for_data_ready(&client->dev);
+
+        return ret_val;
+}
+
+static int apds9802als_probe(struct i2c_client *client,
+                             const struct i2c_device_id *id)
+{
+        int res;
+        struct als_data *data;
+
+        data = kzalloc(sizeof(struct als_data), GFP_KERNEL);
+        if (data == NULL) {
+                dev_err(&client->dev, "Memory allocation failed\n");
+                return -ENOMEM;
+        }
+        i2c_set_clientdata(client, data);
+        res = sysfs_create_group(&client->dev.kobj, &m_als_gr);
+        if (res) {
+                dev_err(&client->dev, "device create file failed\n");
+                goto als_error1;
+        }
+        dev_info(&client->dev, "ALS chip found\n");
+        als_set_default_config(client);
+        mutex_init(&data->mutex);
+
+        pm_runtime_set_active(&client->dev);
+        pm_runtime_enable(&client->dev);
+
+        return res;
+als_error1:
+        kfree(data);
+        return res;
+}
+
+static int __devexit apds9802als_remove(struct i2c_client *client)
+{
+        struct als_data *data = i2c_get_clientdata(client);
+
+        pm_runtime_get_sync(&client->dev);
+
+        als_set_power_state(client, false);
+        sysfs_remove_group(&client->dev.kobj, &m_als_gr);
+
+        pm_runtime_disable(&client->dev);
+        pm_runtime_set_suspended(&client->dev);
+        pm_runtime_put_noidle(&client->dev);
+
+        kfree(data);
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int apds9802als_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+        als_set_power_state(client, false);
+        return 0;
+}
+
+static int apds9802als_resume(struct i2c_client *client)
+{
+        als_set_default_config(client);
+        return 0;
+}
+
+static int apds9802als_runtime_suspend(struct device *dev)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+
+        als_set_power_state(client, false);
+        return 0;
+}
+
+static int apds9802als_runtime_resume(struct device *dev)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+
+        als_set_power_state(client, true);
+        return 0;
+}
+
+static const struct dev_pm_ops apds9802als_pm_ops = {
+        .runtime_suspend = apds9802als_runtime_suspend,
+        .runtime_resume = apds9802als_runtime_resume,
+};
+
+#define APDS9802ALS_PM_OPS (&apds9802als_pm_ops)
+
+#else   /* CONFIG_PM */
+#define apds9802als_suspend NULL
+#define apds9802als_resume NULL
+#define APDS9802ALS_PM_OPS NULL
+#endif  /* CONFIG_PM */
+
+static struct i2c_device_id apds9802als_id[] = {
+        { DRIVER_NAME, 0 },
+        { }
+};
+
+MODULE_DEVICE_TABLE(i2c, apds9802als_id);
+
+static struct i2c_driver apds9802als_driver = {
+        .driver = {
+                .name = DRIVER_NAME,
+                .pm = APDS9802ALS_PM_OPS,
+        },
+        .probe = apds9802als_probe,
+        .remove = __devexit_p(apds9802als_remove),
+        .suspend = apds9802als_suspend,
+        .resume = apds9802als_resume,
+        .id_table = apds9802als_id,
+};
+
+static int __init sensor_apds9802als_init(void)
+{
+        return i2c_add_driver(&apds9802als_driver);
+}
+
+static void  __exit sensor_apds9802als_exit(void)
+{
+        i2c_del_driver(&apds9802als_driver);
+}
+module_init(sensor_apds9802als_init);
+module_exit(sensor_apds9802als_exit);
+
+MODULE_AUTHOR("Anantha Narayanan <Anantha.Narayanan@intel.com");
+MODULE_DESCRIPTION("Avago apds9802als ALS Driver");
+MODULE_LICENSE("GPL v2");