340 lines
8.1 KiB
C
340 lines
8.1 KiB
C
/*
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* apds9802als.c - apds9802 ALS Driver
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*
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* Copyright (C) 2009 Intel Corp
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/err.h>
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#include <linux/delay.h>
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#include <linux/mutex.h>
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#include <linux/sysfs.h>
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#include <linux/pm_runtime.h>
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#define ALS_MIN_RANGE_VAL 1
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#define ALS_MAX_RANGE_VAL 2
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#define POWER_STA_ENABLE 1
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#define POWER_STA_DISABLE 0
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#define DRIVER_NAME "apds9802als"
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struct als_data {
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struct mutex mutex;
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};
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static ssize_t als_sensing_range_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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int val;
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val = i2c_smbus_read_byte_data(client, 0x81);
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if (val < 0)
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return val;
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if (val & 1)
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return sprintf(buf, "4095\n");
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else
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return sprintf(buf, "65535\n");
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}
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static int als_wait_for_data_ready(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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int ret;
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int retry = 10;
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do {
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msleep(30);
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ret = i2c_smbus_read_byte_data(client, 0x86);
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} while (!(ret & 0x80) && retry--);
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if (!retry) {
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dev_warn(dev, "timeout waiting for data ready\n");
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return -ETIMEDOUT;
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}
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return 0;
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}
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static ssize_t als_lux0_input_data_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct als_data *data = i2c_get_clientdata(client);
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int ret_val;
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int temp;
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/* Protect against parallel reads */
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pm_runtime_get_sync(dev);
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mutex_lock(&data->mutex);
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/* clear EOC interrupt status */
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i2c_smbus_write_byte(client, 0x40);
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/* start measurement */
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temp = i2c_smbus_read_byte_data(client, 0x81);
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i2c_smbus_write_byte_data(client, 0x81, temp | 0x08);
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ret_val = als_wait_for_data_ready(dev);
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if (ret_val < 0)
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goto failed;
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temp = i2c_smbus_read_byte_data(client, 0x8C); /* LSB data */
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if (temp < 0) {
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ret_val = temp;
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goto failed;
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}
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ret_val = i2c_smbus_read_byte_data(client, 0x8D); /* MSB data */
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if (ret_val < 0)
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goto failed;
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mutex_unlock(&data->mutex);
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pm_runtime_put_sync(dev);
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temp = (ret_val << 8) | temp;
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return sprintf(buf, "%d\n", temp);
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failed:
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mutex_unlock(&data->mutex);
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pm_runtime_put_sync(dev);
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return ret_val;
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}
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static ssize_t als_sensing_range_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct als_data *data = i2c_get_clientdata(client);
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int ret_val;
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unsigned long val;
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if (strict_strtoul(buf, 10, &val))
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return -EINVAL;
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if (val < 4096)
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val = 1;
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else if (val < 65536)
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val = 2;
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else
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return -ERANGE;
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pm_runtime_get_sync(dev);
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/* Make sure nobody else reads/modifies/writes 0x81 while we
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are active */
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mutex_lock(&data->mutex);
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ret_val = i2c_smbus_read_byte_data(client, 0x81);
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if (ret_val < 0)
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goto fail;
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/* Reset the bits before setting them */
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ret_val = ret_val & 0xFA;
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if (val == 1) /* Setting detection range up to 4k LUX */
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ret_val = (ret_val | 0x01);
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else /* Setting detection range up to 64k LUX*/
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ret_val = (ret_val | 0x00);
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ret_val = i2c_smbus_write_byte_data(client, 0x81, ret_val);
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if (ret_val >= 0) {
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/* All OK */
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mutex_unlock(&data->mutex);
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pm_runtime_put_sync(dev);
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return count;
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}
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fail:
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mutex_unlock(&data->mutex);
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pm_runtime_put_sync(dev);
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return ret_val;
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}
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static int als_set_power_state(struct i2c_client *client, bool on_off)
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{
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int ret_val;
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struct als_data *data = i2c_get_clientdata(client);
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mutex_lock(&data->mutex);
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ret_val = i2c_smbus_read_byte_data(client, 0x80);
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if (ret_val < 0)
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goto fail;
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if (on_off)
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ret_val = ret_val | 0x01;
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else
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ret_val = ret_val & 0xFE;
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ret_val = i2c_smbus_write_byte_data(client, 0x80, ret_val);
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fail:
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mutex_unlock(&data->mutex);
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return ret_val;
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}
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static DEVICE_ATTR(lux0_sensor_range, S_IRUGO | S_IWUSR,
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als_sensing_range_show, als_sensing_range_store);
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static DEVICE_ATTR(lux0_input, S_IRUGO, als_lux0_input_data_show, NULL);
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static struct attribute *mid_att_als[] = {
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&dev_attr_lux0_sensor_range.attr,
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&dev_attr_lux0_input.attr,
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NULL
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};
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static struct attribute_group m_als_gr = {
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.name = "apds9802als",
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.attrs = mid_att_als
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};
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static int als_set_default_config(struct i2c_client *client)
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{
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int ret_val;
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/* Write the command and then switch on */
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ret_val = i2c_smbus_write_byte_data(client, 0x80, 0x01);
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if (ret_val < 0) {
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dev_err(&client->dev, "failed default switch on write\n");
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return ret_val;
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}
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/* detection range: 1~64K Lux, maunal measurement */
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ret_val = i2c_smbus_write_byte_data(client, 0x81, 0x08);
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if (ret_val < 0)
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dev_err(&client->dev, "failed default LUX on write\n");
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/* We always get 0 for the 1st measurement after system power on,
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* so make sure it is finished before user asks for data.
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*/
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als_wait_for_data_ready(&client->dev);
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return ret_val;
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}
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static int apds9802als_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int res;
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struct als_data *data;
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data = kzalloc(sizeof(struct als_data), GFP_KERNEL);
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if (data == NULL) {
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dev_err(&client->dev, "Memory allocation failed\n");
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return -ENOMEM;
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}
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i2c_set_clientdata(client, data);
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res = sysfs_create_group(&client->dev.kobj, &m_als_gr);
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if (res) {
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dev_err(&client->dev, "device create file failed\n");
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goto als_error1;
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}
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dev_info(&client->dev, "ALS chip found\n");
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als_set_default_config(client);
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mutex_init(&data->mutex);
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pm_runtime_set_active(&client->dev);
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pm_runtime_enable(&client->dev);
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return res;
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als_error1:
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kfree(data);
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return res;
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}
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static int __devexit apds9802als_remove(struct i2c_client *client)
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{
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struct als_data *data = i2c_get_clientdata(client);
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pm_runtime_get_sync(&client->dev);
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als_set_power_state(client, false);
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sysfs_remove_group(&client->dev.kobj, &m_als_gr);
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pm_runtime_disable(&client->dev);
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pm_runtime_set_suspended(&client->dev);
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pm_runtime_put_noidle(&client->dev);
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kfree(data);
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return 0;
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}
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#ifdef CONFIG_PM
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static int apds9802als_suspend(struct i2c_client *client, pm_message_t mesg)
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{
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als_set_power_state(client, false);
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return 0;
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}
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static int apds9802als_resume(struct i2c_client *client)
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{
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als_set_default_config(client);
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return 0;
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}
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static int apds9802als_runtime_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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als_set_power_state(client, false);
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return 0;
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}
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static int apds9802als_runtime_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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als_set_power_state(client, true);
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return 0;
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}
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static const struct dev_pm_ops apds9802als_pm_ops = {
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.runtime_suspend = apds9802als_runtime_suspend,
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.runtime_resume = apds9802als_runtime_resume,
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};
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#define APDS9802ALS_PM_OPS (&apds9802als_pm_ops)
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#else /* CONFIG_PM */
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#define apds9802als_suspend NULL
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#define apds9802als_resume NULL
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#define APDS9802ALS_PM_OPS NULL
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#endif /* CONFIG_PM */
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static struct i2c_device_id apds9802als_id[] = {
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{ DRIVER_NAME, 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, apds9802als_id);
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static struct i2c_driver apds9802als_driver = {
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.driver = {
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.name = DRIVER_NAME,
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.pm = APDS9802ALS_PM_OPS,
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},
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.probe = apds9802als_probe,
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.remove = __devexit_p(apds9802als_remove),
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.suspend = apds9802als_suspend,
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.resume = apds9802als_resume,
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.id_table = apds9802als_id,
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};
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module_i2c_driver(apds9802als_driver);
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MODULE_AUTHOR("Anantha Narayanan <Anantha.Narayanan@intel.com");
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MODULE_DESCRIPTION("Avago apds9802als ALS Driver");
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MODULE_LICENSE("GPL v2");
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