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2e85c4dd KT |
1 | /* |
2 | * isl29020.c - Intersil ALS Driver | |
3 | * | |
4 | * Copyright (C) 2008 Intel Corp | |
5 | * | |
6 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; version 2 of the License. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License along | |
18 | * with this program; if not, write to the Free Software Foundation, Inc., | |
19 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
20 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
21 | * | |
22 | * Data sheet at: http://www.intersil.com/data/fn/fn6505.pdf | |
23 | */ | |
24 | ||
25 | #include <linux/module.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/i2c.h> | |
29 | #include <linux/err.h> | |
30 | #include <linux/delay.h> | |
31 | #include <linux/sysfs.h> | |
32 | #include <linux/pm_runtime.h> | |
33 | ||
34 | static DEFINE_MUTEX(mutex); | |
35 | ||
36 | static ssize_t als_sensing_range_show(struct device *dev, | |
37 | struct device_attribute *attr, char *buf) | |
38 | { | |
39 | struct i2c_client *client = to_i2c_client(dev); | |
40 | int val; | |
41 | ||
42 | val = i2c_smbus_read_byte_data(client, 0x00); | |
43 | ||
44 | if (val < 0) | |
45 | return val; | |
46 | return sprintf(buf, "%d000\n", 1 << (2 * (val & 3))); | |
47 | ||
48 | } | |
49 | ||
50 | static ssize_t als_lux_input_data_show(struct device *dev, | |
51 | struct device_attribute *attr, char *buf) | |
52 | { | |
53 | struct i2c_client *client = to_i2c_client(dev); | |
54 | int ret_val, val; | |
55 | unsigned long int lux; | |
56 | int temp; | |
57 | ||
58 | pm_runtime_get_sync(dev); | |
59 | msleep(100); | |
60 | ||
61 | mutex_lock(&mutex); | |
62 | temp = i2c_smbus_read_byte_data(client, 0x02); /* MSB data */ | |
63 | if (temp < 0) { | |
64 | pm_runtime_put_sync(dev); | |
65 | mutex_unlock(&mutex); | |
66 | return temp; | |
67 | } | |
68 | ||
69 | ret_val = i2c_smbus_read_byte_data(client, 0x01); /* LSB data */ | |
70 | mutex_unlock(&mutex); | |
71 | ||
72 | if (ret_val < 0) { | |
73 | pm_runtime_put_sync(dev); | |
74 | return ret_val; | |
75 | } | |
76 | ||
77 | ret_val |= temp << 8; | |
78 | val = i2c_smbus_read_byte_data(client, 0x00); | |
79 | pm_runtime_put_sync(dev); | |
80 | if (val < 0) | |
81 | return val; | |
82 | lux = ((((1 << (2 * (val & 3))))*1000) * ret_val) / 65536; | |
83 | return sprintf(buf, "%ld\n", lux); | |
84 | } | |
85 | ||
86 | static ssize_t als_sensing_range_store(struct device *dev, | |
87 | struct device_attribute *attr, const char *buf, size_t count) | |
88 | { | |
89 | struct i2c_client *client = to_i2c_client(dev); | |
90482e45 | 90 | int ret_val; |
2e85c4dd KT |
91 | unsigned long val; |
92 | ||
f7b41276 JH |
93 | ret_val = kstrtoul(buf, 10, &val); |
94 | if (ret_val) | |
95 | return ret_val; | |
96 | ||
2e85c4dd KT |
97 | if (val < 1 || val > 64000) |
98 | return -EINVAL; | |
99 | ||
100 | /* Pick the smallest sensor range that will meet our requirements */ | |
101 | if (val <= 1000) | |
102 | val = 1; | |
103 | else if (val <= 4000) | |
104 | val = 2; | |
105 | else if (val <= 16000) | |
106 | val = 3; | |
107 | else | |
108 | val = 4; | |
109 | ||
110 | ret_val = i2c_smbus_read_byte_data(client, 0x00); | |
90482e45 DC |
111 | if (ret_val < 0) |
112 | return ret_val; | |
2e85c4dd KT |
113 | |
114 | ret_val &= 0xFC; /*reset the bit before setting them */ | |
115 | ret_val |= val - 1; | |
116 | ret_val = i2c_smbus_write_byte_data(client, 0x00, ret_val); | |
117 | ||
118 | if (ret_val < 0) | |
119 | return ret_val; | |
120 | return count; | |
121 | } | |
122 | ||
123 | static void als_set_power_state(struct i2c_client *client, int enable) | |
124 | { | |
125 | int ret_val; | |
126 | ||
127 | ret_val = i2c_smbus_read_byte_data(client, 0x00); | |
128 | if (ret_val < 0) | |
129 | return; | |
130 | ||
131 | if (enable) | |
132 | ret_val |= 0x80; | |
133 | else | |
134 | ret_val &= 0x7F; | |
135 | ||
136 | i2c_smbus_write_byte_data(client, 0x00, ret_val); | |
137 | } | |
138 | ||
139 | static DEVICE_ATTR(lux0_sensor_range, S_IRUGO | S_IWUSR, | |
140 | als_sensing_range_show, als_sensing_range_store); | |
141 | static DEVICE_ATTR(lux0_input, S_IRUGO, als_lux_input_data_show, NULL); | |
142 | ||
143 | static struct attribute *mid_att_als[] = { | |
144 | &dev_attr_lux0_sensor_range.attr, | |
145 | &dev_attr_lux0_input.attr, | |
146 | NULL | |
147 | }; | |
148 | ||
149 | static struct attribute_group m_als_gr = { | |
150 | .name = "isl29020", | |
151 | .attrs = mid_att_als | |
152 | }; | |
153 | ||
154 | static int als_set_default_config(struct i2c_client *client) | |
155 | { | |
156 | int retval; | |
157 | ||
158 | retval = i2c_smbus_write_byte_data(client, 0x00, 0xc0); | |
159 | if (retval < 0) { | |
160 | dev_err(&client->dev, "default write failed."); | |
161 | return retval; | |
162 | } | |
2a5ac6f7 | 163 | return 0; |
2e85c4dd KT |
164 | } |
165 | ||
166 | static int isl29020_probe(struct i2c_client *client, | |
167 | const struct i2c_device_id *id) | |
168 | { | |
169 | int res; | |
170 | ||
171 | res = als_set_default_config(client); | |
172 | if (res < 0) | |
173 | return res; | |
174 | ||
175 | res = sysfs_create_group(&client->dev.kobj, &m_als_gr); | |
176 | if (res) { | |
177 | dev_err(&client->dev, "isl29020: device create file failed\n"); | |
178 | return res; | |
179 | } | |
180 | dev_info(&client->dev, "%s isl29020: ALS chip found\n", client->name); | |
181 | als_set_power_state(client, 0); | |
182 | pm_runtime_enable(&client->dev); | |
183 | return res; | |
184 | } | |
185 | ||
186 | static int isl29020_remove(struct i2c_client *client) | |
187 | { | |
2e85c4dd | 188 | sysfs_remove_group(&client->dev.kobj, &m_als_gr); |
2e85c4dd KT |
189 | return 0; |
190 | } | |
191 | ||
192 | static struct i2c_device_id isl29020_id[] = { | |
193 | { "isl29020", 0 }, | |
194 | { } | |
195 | }; | |
196 | ||
197 | MODULE_DEVICE_TABLE(i2c, isl29020_id); | |
198 | ||
199 | #ifdef CONFIG_PM | |
200 | ||
201 | static int isl29020_runtime_suspend(struct device *dev) | |
202 | { | |
203 | struct i2c_client *client = to_i2c_client(dev); | |
204 | als_set_power_state(client, 0); | |
205 | return 0; | |
206 | } | |
207 | ||
208 | static int isl29020_runtime_resume(struct device *dev) | |
209 | { | |
210 | struct i2c_client *client = to_i2c_client(dev); | |
211 | als_set_power_state(client, 1); | |
212 | return 0; | |
213 | } | |
214 | ||
215 | static const struct dev_pm_ops isl29020_pm_ops = { | |
216 | .runtime_suspend = isl29020_runtime_suspend, | |
217 | .runtime_resume = isl29020_runtime_resume, | |
218 | }; | |
219 | ||
220 | #define ISL29020_PM_OPS (&isl29020_pm_ops) | |
221 | #else /* CONFIG_PM */ | |
222 | #define ISL29020_PM_OPS NULL | |
223 | #endif /* CONFIG_PM */ | |
224 | ||
225 | static struct i2c_driver isl29020_driver = { | |
226 | .driver = { | |
227 | .name = "isl29020", | |
228 | .pm = ISL29020_PM_OPS, | |
229 | }, | |
230 | .probe = isl29020_probe, | |
231 | .remove = isl29020_remove, | |
232 | .id_table = isl29020_id, | |
233 | }; | |
234 | ||
a64fe2ed | 235 | module_i2c_driver(isl29020_driver); |
2e85c4dd | 236 | |
b38eeaae | 237 | MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com>"); |
2e85c4dd KT |
238 | MODULE_DESCRIPTION("Intersil isl29020 ALS Driver"); |
239 | MODULE_LICENSE("GPL v2"); |