| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * apds9802als.c - apds9802 ALS Driver |
| * |
| * Copyright (C) 2009 Intel Corp |
| * |
| * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| * |
| * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| */ |
| |
| #include <linux/module.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 < 0) { |
| 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; |
| |
| ret_val = kstrtoul(buf, 10, &val); |
| if (ret_val) |
| return ret_val; |
| |
| 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 const 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 void 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); |
| } |
| |
| #ifdef CONFIG_PM |
| |
| static int apds9802als_suspend(struct device *dev) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| |
| als_set_power_state(client, false); |
| return 0; |
| } |
| |
| static int apds9802als_resume(struct device *dev) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| |
| als_set_power_state(client, true); |
| return 0; |
| } |
| |
| static UNIVERSAL_DEV_PM_OPS(apds9802als_pm_ops, apds9802als_suspend, |
| apds9802als_resume, NULL); |
| |
| #define APDS9802ALS_PM_OPS (&apds9802als_pm_ops) |
| |
| #else /* CONFIG_PM */ |
| #define APDS9802ALS_PM_OPS NULL |
| #endif /* CONFIG_PM */ |
| |
| static const 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 = apds9802als_remove, |
| .id_table = apds9802als_id, |
| }; |
| |
| module_i2c_driver(apds9802als_driver); |
| |
| MODULE_AUTHOR("Anantha Narayanan <Anantha.Narayanan@intel.com"); |
| MODULE_DESCRIPTION("Avago apds9802als ALS Driver"); |
| MODULE_LICENSE("GPL v2"); |