| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * isl29020.c - Intersil ALS Driver |
| * |
| * Copyright (C) 2008 Intel Corp |
| * |
| * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| * |
| * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| * |
| * Data sheet at: http://www.intersil.com/data/fn/fn6505.pdf |
| */ |
| |
| #include <linux/module.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); |
| int ret_val; |
| unsigned long val; |
| |
| ret_val = kstrtoul(buf, 10, &val); |
| if (ret_val) |
| return ret_val; |
| |
| 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); |
| if (ret_val < 0) |
| return ret_val; |
| |
| 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 const 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 void isl29020_remove(struct i2c_client *client) |
| { |
| pm_runtime_disable(&client->dev); |
| sysfs_remove_group(&client->dev.kobj, &m_als_gr); |
| } |
| |
| static const 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, |
| }; |
| |
| module_i2c_driver(isl29020_driver); |
| |
| MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com>"); |
| MODULE_DESCRIPTION("Intersil isl29020 ALS Driver"); |
| MODULE_LICENSE("GPL v2"); |