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873e65bc | 1 | // SPDX-License-Identifier: GPL-2.0-only |
2e85c4dd KT |
2 | /* |
3 | * isl29020.c - Intersil ALS Driver | |
4 | * | |
5 | * Copyright (C) 2008 Intel Corp | |
6 | * | |
7 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
8 | * | |
2e85c4dd KT |
9 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
10 | * | |
11 | * Data sheet at: http://www.intersil.com/data/fn/fn6505.pdf | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
2e85c4dd KT |
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); | |
90482e45 | 78 | int ret_val; |
2e85c4dd KT |
79 | unsigned long val; |
80 | ||
f7b41276 JH |
81 | ret_val = kstrtoul(buf, 10, &val); |
82 | if (ret_val) | |
83 | return ret_val; | |
84 | ||
2e85c4dd KT |
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); | |
90482e45 DC |
99 | if (ret_val < 0) |
100 | return ret_val; | |
2e85c4dd KT |
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 | ||
64e6d2c1 | 137 | static const struct attribute_group m_als_gr = { |
2e85c4dd KT |
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 | } | |
2a5ac6f7 | 151 | return 0; |
2e85c4dd KT |
152 | } |
153 | ||
154 | static int isl29020_probe(struct i2c_client *client, | |
155 | const struct i2c_device_id *id) | |
156 | { | |
157 | int res; | |
158 | ||
159 | res = als_set_default_config(client); | |
160 | if (res < 0) | |
161 | return res; | |
162 | ||
163 | res = sysfs_create_group(&client->dev.kobj, &m_als_gr); | |
164 | if (res) { | |
165 | dev_err(&client->dev, "isl29020: device create file failed\n"); | |
166 | return res; | |
167 | } | |
168 | dev_info(&client->dev, "%s isl29020: ALS chip found\n", client->name); | |
169 | als_set_power_state(client, 0); | |
170 | pm_runtime_enable(&client->dev); | |
171 | return res; | |
172 | } | |
173 | ||
174 | static int isl29020_remove(struct i2c_client *client) | |
175 | { | |
efb5bea6 | 176 | pm_runtime_disable(&client->dev); |
2e85c4dd | 177 | sysfs_remove_group(&client->dev.kobj, &m_als_gr); |
2e85c4dd KT |
178 | return 0; |
179 | } | |
180 | ||
07e4049a | 181 | static const struct i2c_device_id isl29020_id[] = { |
2e85c4dd KT |
182 | { "isl29020", 0 }, |
183 | { } | |
184 | }; | |
185 | ||
186 | MODULE_DEVICE_TABLE(i2c, isl29020_id); | |
187 | ||
188 | #ifdef CONFIG_PM | |
189 | ||
190 | static int isl29020_runtime_suspend(struct device *dev) | |
191 | { | |
192 | struct i2c_client *client = to_i2c_client(dev); | |
193 | als_set_power_state(client, 0); | |
194 | return 0; | |
195 | } | |
196 | ||
197 | static int isl29020_runtime_resume(struct device *dev) | |
198 | { | |
199 | struct i2c_client *client = to_i2c_client(dev); | |
200 | als_set_power_state(client, 1); | |
201 | return 0; | |
202 | } | |
203 | ||
204 | static const struct dev_pm_ops isl29020_pm_ops = { | |
205 | .runtime_suspend = isl29020_runtime_suspend, | |
206 | .runtime_resume = isl29020_runtime_resume, | |
207 | }; | |
208 | ||
209 | #define ISL29020_PM_OPS (&isl29020_pm_ops) | |
210 | #else /* CONFIG_PM */ | |
211 | #define ISL29020_PM_OPS NULL | |
212 | #endif /* CONFIG_PM */ | |
213 | ||
214 | static struct i2c_driver isl29020_driver = { | |
215 | .driver = { | |
216 | .name = "isl29020", | |
217 | .pm = ISL29020_PM_OPS, | |
218 | }, | |
219 | .probe = isl29020_probe, | |
220 | .remove = isl29020_remove, | |
221 | .id_table = isl29020_id, | |
222 | }; | |
223 | ||
a64fe2ed | 224 | module_i2c_driver(isl29020_driver); |
2e85c4dd | 225 | |
b38eeaae | 226 | MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com>"); |
2e85c4dd KT |
227 | MODULE_DESCRIPTION("Intersil isl29020 ALS Driver"); |
228 | MODULE_LICENSE("GPL v2"); |