1 // SPDX-License-Identifier: GPL-2.0-only
3 * isl29020.c - Intersil ALS Driver
5 * Copyright (C) 2008 Intel Corp
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11 * Data sheet at: http://www.intersil.com/data/fn/fn6505.pdf
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/i2c.h>
17 #include <linux/err.h>
18 #include <linux/delay.h>
19 #include <linux/sysfs.h>
20 #include <linux/pm_runtime.h>
22 static DEFINE_MUTEX(mutex);
24 static ssize_t als_sensing_range_show(struct device *dev,
25 struct device_attribute *attr, char *buf)
27 struct i2c_client *client = to_i2c_client(dev);
30 val = i2c_smbus_read_byte_data(client, 0x00);
34 return sprintf(buf, "%d000\n", 1 << (2 * (val & 3)));
38 static ssize_t als_lux_input_data_show(struct device *dev,
39 struct device_attribute *attr, char *buf)
41 struct i2c_client *client = to_i2c_client(dev);
43 unsigned long int lux;
46 pm_runtime_get_sync(dev);
50 temp = i2c_smbus_read_byte_data(client, 0x02); /* MSB data */
52 pm_runtime_put_sync(dev);
57 ret_val = i2c_smbus_read_byte_data(client, 0x01); /* LSB data */
61 pm_runtime_put_sync(dev);
66 val = i2c_smbus_read_byte_data(client, 0x00);
67 pm_runtime_put_sync(dev);
70 lux = ((((1 << (2 * (val & 3))))*1000) * ret_val) / 65536;
71 return sprintf(buf, "%ld\n", lux);
74 static ssize_t als_sensing_range_store(struct device *dev,
75 struct device_attribute *attr, const char *buf, size_t count)
77 struct i2c_client *client = to_i2c_client(dev);
81 ret_val = kstrtoul(buf, 10, &val);
85 if (val < 1 || val > 64000)
88 /* Pick the smallest sensor range that will meet our requirements */
93 else if (val <= 16000)
98 ret_val = i2c_smbus_read_byte_data(client, 0x00);
102 ret_val &= 0xFC; /*reset the bit before setting them */
104 ret_val = i2c_smbus_write_byte_data(client, 0x00, ret_val);
111 static void als_set_power_state(struct i2c_client *client, int enable)
115 ret_val = i2c_smbus_read_byte_data(client, 0x00);
124 i2c_smbus_write_byte_data(client, 0x00, ret_val);
127 static DEVICE_ATTR(lux0_sensor_range, S_IRUGO | S_IWUSR,
128 als_sensing_range_show, als_sensing_range_store);
129 static DEVICE_ATTR(lux0_input, S_IRUGO, als_lux_input_data_show, NULL);
131 static struct attribute *mid_att_als[] = {
132 &dev_attr_lux0_sensor_range.attr,
133 &dev_attr_lux0_input.attr,
137 static const struct attribute_group m_als_gr = {
142 static int als_set_default_config(struct i2c_client *client)
146 retval = i2c_smbus_write_byte_data(client, 0x00, 0xc0);
148 dev_err(&client->dev, "default write failed.");
154 static int isl29020_probe(struct i2c_client *client)
158 res = als_set_default_config(client);
162 res = sysfs_create_group(&client->dev.kobj, &m_als_gr);
164 dev_err(&client->dev, "isl29020: device create file failed\n");
167 dev_info(&client->dev, "%s isl29020: ALS chip found\n", client->name);
168 als_set_power_state(client, 0);
169 pm_runtime_enable(&client->dev);
173 static void isl29020_remove(struct i2c_client *client)
175 pm_runtime_disable(&client->dev);
176 sysfs_remove_group(&client->dev.kobj, &m_als_gr);
179 static const struct i2c_device_id isl29020_id[] = {
184 MODULE_DEVICE_TABLE(i2c, isl29020_id);
188 static int isl29020_runtime_suspend(struct device *dev)
190 struct i2c_client *client = to_i2c_client(dev);
191 als_set_power_state(client, 0);
195 static int isl29020_runtime_resume(struct device *dev)
197 struct i2c_client *client = to_i2c_client(dev);
198 als_set_power_state(client, 1);
202 static const struct dev_pm_ops isl29020_pm_ops = {
203 .runtime_suspend = isl29020_runtime_suspend,
204 .runtime_resume = isl29020_runtime_resume,
207 #define ISL29020_PM_OPS (&isl29020_pm_ops)
208 #else /* CONFIG_PM */
209 #define ISL29020_PM_OPS NULL
210 #endif /* CONFIG_PM */
212 static struct i2c_driver isl29020_driver = {
215 .pm = ISL29020_PM_OPS,
217 .probe = isl29020_probe,
218 .remove = isl29020_remove,
219 .id_table = isl29020_id,
222 module_i2c_driver(isl29020_driver);
224 MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com>");
225 MODULE_DESCRIPTION("Intersil isl29020 ALS Driver");
226 MODULE_LICENSE("GPL v2");