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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * isl29020.c - Intersil ALS Driver
4 *
5 * Copyright (C) 2008 Intel Corp
6 *
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 *
11 * Data sheet at: http://www.intersil.com/data/fn/fn6505.pdf
12 */
13
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>
21
22static DEFINE_MUTEX(mutex);
23
24static ssize_t als_sensing_range_show(struct device *dev,
25 struct device_attribute *attr, char *buf)
26{
27 struct i2c_client *client = to_i2c_client(dev);
28 int val;
29
30 val = i2c_smbus_read_byte_data(client, 0x00);
31
32 if (val < 0)
33 return val;
34 return sprintf(buf, "%d000\n", 1 << (2 * (val & 3)));
35
36}
37
38static ssize_t als_lux_input_data_show(struct device *dev,
39 struct device_attribute *attr, char *buf)
40{
41 struct i2c_client *client = to_i2c_client(dev);
42 int ret_val, val;
43 unsigned long int lux;
44 int temp;
45
46 pm_runtime_get_sync(dev);
47 msleep(100);
48
49 mutex_lock(&mutex);
50 temp = i2c_smbus_read_byte_data(client, 0x02); /* MSB data */
51 if (temp < 0) {
52 pm_runtime_put_sync(dev);
53 mutex_unlock(&mutex);
54 return temp;
55 }
56
57 ret_val = i2c_smbus_read_byte_data(client, 0x01); /* LSB data */
58 mutex_unlock(&mutex);
59
60 if (ret_val < 0) {
61 pm_runtime_put_sync(dev);
62 return ret_val;
63 }
64
65 ret_val |= temp << 8;
66 val = i2c_smbus_read_byte_data(client, 0x00);
67 pm_runtime_put_sync(dev);
68 if (val < 0)
69 return val;
70 lux = ((((1 << (2 * (val & 3))))*1000) * ret_val) / 65536;
71 return sprintf(buf, "%lu\n", lux);
72}
73
74static ssize_t als_sensing_range_store(struct device *dev,
75 struct device_attribute *attr, const char *buf, size_t count)
76{
77 struct i2c_client *client = to_i2c_client(dev);
78 int ret_val;
79 unsigned long val;
80
81 ret_val = kstrtoul(buf, 10, &val);
82 if (ret_val)
83 return ret_val;
84
85 if (val < 1 || val > 64000)
86 return -EINVAL;
87
88 /* Pick the smallest sensor range that will meet our requirements */
89 if (val <= 1000)
90 val = 1;
91 else if (val <= 4000)
92 val = 2;
93 else if (val <= 16000)
94 val = 3;
95 else
96 val = 4;
97
98 ret_val = i2c_smbus_read_byte_data(client, 0x00);
99 if (ret_val < 0)
100 return ret_val;
101
102 ret_val &= 0xFC; /*reset the bit before setting them */
103 ret_val |= val - 1;
104 ret_val = i2c_smbus_write_byte_data(client, 0x00, ret_val);
105
106 if (ret_val < 0)
107 return ret_val;
108 return count;
109}
110
111static void als_set_power_state(struct i2c_client *client, int enable)
112{
113 int ret_val;
114
115 ret_val = i2c_smbus_read_byte_data(client, 0x00);
116 if (ret_val < 0)
117 return;
118
119 if (enable)
120 ret_val |= 0x80;
121 else
122 ret_val &= 0x7F;
123
124 i2c_smbus_write_byte_data(client, 0x00, ret_val);
125}
126
127static DEVICE_ATTR(lux0_sensor_range, S_IRUGO | S_IWUSR,
128 als_sensing_range_show, als_sensing_range_store);
129static DEVICE_ATTR(lux0_input, S_IRUGO, als_lux_input_data_show, NULL);
130
131static struct attribute *mid_att_als[] = {
132 &dev_attr_lux0_sensor_range.attr,
133 &dev_attr_lux0_input.attr,
134 NULL
135};
136
137static const struct attribute_group m_als_gr = {
138 .name = "isl29020",
139 .attrs = mid_att_als
140};
141
142static int als_set_default_config(struct i2c_client *client)
143{
144 int retval;
145
146 retval = i2c_smbus_write_byte_data(client, 0x00, 0xc0);
147 if (retval < 0) {
148 dev_err(&client->dev, "default write failed.");
149 return retval;
150 }
151 return 0;
152}
153
154static int isl29020_probe(struct i2c_client *client)
155{
156 int res;
157
158 res = als_set_default_config(client);
159 if (res < 0)
160 return res;
161
162 res = sysfs_create_group(&client->dev.kobj, &m_als_gr);
163 if (res) {
164 dev_err(&client->dev, "isl29020: device create file failed\n");
165 return res;
166 }
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);
170 return res;
171}
172
173static void isl29020_remove(struct i2c_client *client)
174{
175 pm_runtime_disable(&client->dev);
176 sysfs_remove_group(&client->dev.kobj, &m_als_gr);
177}
178
179static const struct i2c_device_id isl29020_id[] = {
180 { .name = "isl29020" },
181 { }
182};
183
184MODULE_DEVICE_TABLE(i2c, isl29020_id);
185
186#ifdef CONFIG_PM
187
188static int isl29020_runtime_suspend(struct device *dev)
189{
190 struct i2c_client *client = to_i2c_client(dev);
191 als_set_power_state(client, 0);
192 return 0;
193}
194
195static int isl29020_runtime_resume(struct device *dev)
196{
197 struct i2c_client *client = to_i2c_client(dev);
198 als_set_power_state(client, 1);
199 return 0;
200}
201
202static const struct dev_pm_ops isl29020_pm_ops = {
203 .runtime_suspend = isl29020_runtime_suspend,
204 .runtime_resume = isl29020_runtime_resume,
205};
206
207#define ISL29020_PM_OPS (&isl29020_pm_ops)
208#else /* CONFIG_PM */
209#define ISL29020_PM_OPS NULL
210#endif /* CONFIG_PM */
211
212static struct i2c_driver isl29020_driver = {
213 .driver = {
214 .name = "isl29020",
215 .pm = ISL29020_PM_OPS,
216 },
217 .probe = isl29020_probe,
218 .remove = isl29020_remove,
219 .id_table = isl29020_id,
220};
221
222module_i2c_driver(isl29020_driver);
223
224MODULE_AUTHOR("Kalhan Trisal <[email protected]>");
225MODULE_DESCRIPTION("Intersil isl29020 ALS Driver");
226MODULE_LICENSE("GPL v2");