Merge tag 'drm-intel-gt-next-2023-08-04' of git://anongit.freedesktop.org/drm/drm...
[platform/kernel/linux-rpi.git] / drivers / misc / isl29020.c
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
22 static DEFINE_MUTEX(mutex);
23
24 static 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
38 static 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, "%ld\n", lux);
72 }
73
74 static 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
111 static 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
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);
130
131 static struct attribute *mid_att_als[] = {
132         &dev_attr_lux0_sensor_range.attr,
133         &dev_attr_lux0_input.attr,
134         NULL
135 };
136
137 static const struct attribute_group m_als_gr = {
138         .name = "isl29020",
139         .attrs = mid_att_als
140 };
141
142 static 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
154 static 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
173 static 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
179 static const struct i2c_device_id isl29020_id[] = {
180         { "isl29020", 0 },
181         { }
182 };
183
184 MODULE_DEVICE_TABLE(i2c, isl29020_id);
185
186 #ifdef CONFIG_PM
187
188 static 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
195 static 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
202 static 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
212 static 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
222 module_i2c_driver(isl29020_driver);
223
224 MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com>");
225 MODULE_DESCRIPTION("Intersil isl29020 ALS Driver");
226 MODULE_LICENSE("GPL v2");