diff options
author | anantha <anantha.narayanan@intel.com> | 2010-10-26 17:22:41 -0400 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-26 19:52:15 -0400 |
commit | 22d96aa59cf120db3584e4c3365554cae77d2441 (patch) | |
tree | c43dd27c61139ee599bfe34ccaa7b14382d74b8a /drivers | |
parent | 8a233f01b7d7dd587f85fa581274f168f1e88bb8 (diff) |
drivers/misc/apds9802als.c: ALS drivers for the apds9802als
This adds support for the ADPS9802ALS sensor.
Cleanup by Alan Cox
- move mutexes to cover more things
- report I/O errors back to user space
- report range and values in LUX
Signed-off-by: Anantha Narayanan <anantha.narayanan@intel.com>
[The 4K and 64K in the hw spec actually means 4095 (12bit) and 65535 (16bit).]
Signed-off-by: Hong Liu <hong.liu@intel.com>
[Updated to match the ALS light API interface convention from Samu]
Signed-off-by: Alan Cox <alan@linux.intel.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/misc/Kconfig | 10 | ||||
-rw-r--r-- | drivers/misc/Makefile | 1 | ||||
-rw-r--r-- | drivers/misc/apds9802als.c | 308 |
3 files changed, 319 insertions, 0 deletions
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 477a9434b9c0..6d7665ce6f4a 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig | |||
@@ -285,6 +285,16 @@ config SGI_GRU_DEBUG | |||
285 | This option enables addition debugging code for the SGI GRU driver. If | 285 | This option enables addition debugging code for the SGI GRU driver. If |
286 | you are unsure, say N. | 286 | you are unsure, say N. |
287 | 287 | ||
288 | config APDS9802ALS | ||
289 | tristate "Medfield Avago APDS9802 ALS Sensor module" | ||
290 | depends on I2C | ||
291 | help | ||
292 | If you say yes here you get support for the ALS APDS9802 ambient | ||
293 | light sensor. | ||
294 | |||
295 | This driver can also be built as a module. If so, the module | ||
296 | will be called apds9802als. | ||
297 | |||
288 | config ISL29003 | 298 | config ISL29003 |
289 | tristate "Intersil ISL29003 ambient light sensor" | 299 | tristate "Intersil ISL29003 ambient light sensor" |
290 | depends on I2C && SYSFS | 300 | depends on I2C && SYSFS |
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 2ecdd32d1357..4be5c6fc5ef4 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile | |||
@@ -25,6 +25,7 @@ obj-$(CONFIG_SGI_XP) += sgi-xp/ | |||
25 | obj-$(CONFIG_SGI_GRU) += sgi-gru/ | 25 | obj-$(CONFIG_SGI_GRU) += sgi-gru/ |
26 | obj-$(CONFIG_CS5535_MFGPT) += cs5535-mfgpt.o | 26 | obj-$(CONFIG_CS5535_MFGPT) += cs5535-mfgpt.o |
27 | obj-$(CONFIG_HP_ILO) += hpilo.o | 27 | obj-$(CONFIG_HP_ILO) += hpilo.o |
28 | obj-$(CONFIG_APDS9802ALS) += apds9802als.o | ||
28 | obj-$(CONFIG_ISL29003) += isl29003.o | 29 | obj-$(CONFIG_ISL29003) += isl29003.o |
29 | obj-$(CONFIG_ISL29020) += isl29020.o | 30 | obj-$(CONFIG_ISL29020) += isl29020.o |
30 | obj-$(CONFIG_SENSORS_TSL2550) += tsl2550.o | 31 | obj-$(CONFIG_SENSORS_TSL2550) += tsl2550.o |
diff --git a/drivers/misc/apds9802als.c b/drivers/misc/apds9802als.c new file mode 100644 index 000000000000..fbe49602f396 --- /dev/null +++ b/drivers/misc/apds9802als.c | |||
@@ -0,0 +1,308 @@ | |||
1 | /* | ||
2 | * apds9802als.c - apds9802 ALS Driver | ||
3 | * | ||
4 | * Copyright (C) 2009 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 | */ | ||
23 | |||
24 | #include <linux/module.h> | ||
25 | #include <linux/init.h> | ||
26 | #include <linux/slab.h> | ||
27 | #include <linux/i2c.h> | ||
28 | #include <linux/err.h> | ||
29 | #include <linux/delay.h> | ||
30 | #include <linux/mutex.h> | ||
31 | #include <linux/sysfs.h> | ||
32 | #include <linux/hwmon-sysfs.h> | ||
33 | |||
34 | #define ALS_MIN_RANGE_VAL 1 | ||
35 | #define ALS_MAX_RANGE_VAL 2 | ||
36 | #define POWER_STA_ENABLE 1 | ||
37 | #define POWER_STA_DISABLE 0 | ||
38 | #define APDS9802ALS_I2C_ADDR 0x29 | ||
39 | |||
40 | #define DRIVER_NAME "apds9802als" | ||
41 | |||
42 | struct als_data { | ||
43 | struct device *hwmon_dev; | ||
44 | bool needresume; | ||
45 | struct mutex mutex; | ||
46 | }; | ||
47 | |||
48 | static ssize_t als_sensing_range_show(struct device *dev, | ||
49 | struct device_attribute *attr, char *buf) | ||
50 | { | ||
51 | struct i2c_client *client = to_i2c_client(dev); | ||
52 | int val; | ||
53 | |||
54 | val = i2c_smbus_read_byte_data(client, 0x81); | ||
55 | if (val < 0) | ||
56 | return val; | ||
57 | if (val & 1) | ||
58 | return sprintf(buf, "4095\n"); | ||
59 | else | ||
60 | return sprintf(buf, "65535\n"); | ||
61 | } | ||
62 | |||
63 | static ssize_t als_lux0_input_data_show(struct device *dev, | ||
64 | struct device_attribute *attr, char *buf) | ||
65 | { | ||
66 | struct i2c_client *client = to_i2c_client(dev); | ||
67 | struct als_data *data = i2c_get_clientdata(client); | ||
68 | unsigned int ret_val; | ||
69 | int temp; | ||
70 | |||
71 | /* Protect against parallel reads */ | ||
72 | mutex_lock(&data->mutex); | ||
73 | temp = i2c_smbus_read_byte_data(client, 0x8C);/*LSB data*/ | ||
74 | if (temp < 0) { | ||
75 | ret_val = temp; | ||
76 | goto failed; | ||
77 | } | ||
78 | ret_val = i2c_smbus_read_byte_data(client, 0x8D);/*MSB data*/ | ||
79 | if (ret_val < 0) | ||
80 | goto failed; | ||
81 | mutex_unlock(&data->mutex); | ||
82 | ret_val = (ret_val << 8) | temp; | ||
83 | return sprintf(buf, "%d\n", ret_val); | ||
84 | failed: | ||
85 | mutex_unlock(&data->mutex); | ||
86 | return ret_val; | ||
87 | } | ||
88 | |||
89 | static ssize_t als_sensing_range_store(struct device *dev, | ||
90 | struct device_attribute *attr, const char *buf, size_t count) | ||
91 | { | ||
92 | struct i2c_client *client = to_i2c_client(dev); | ||
93 | struct als_data *data = i2c_get_clientdata(client); | ||
94 | unsigned int ret_val; | ||
95 | unsigned long val; | ||
96 | |||
97 | if (strict_strtoul(buf, 10, &val)) | ||
98 | return -EINVAL; | ||
99 | |||
100 | if (val < 4096) | ||
101 | val = 1; | ||
102 | else if (val < 65536) | ||
103 | val = 2; | ||
104 | else | ||
105 | return -ERANGE; | ||
106 | |||
107 | /* Make sure nobody else reads/modifies/writes 0x81 while we | ||
108 | are active */ | ||
109 | |||
110 | mutex_lock(&data->mutex); | ||
111 | |||
112 | ret_val = i2c_smbus_read_byte_data(client, 0x81); | ||
113 | if (ret_val < 0) | ||
114 | goto fail; | ||
115 | |||
116 | /* Reset the bits before setting them */ | ||
117 | ret_val = ret_val & 0xFA; | ||
118 | |||
119 | if (val == 1) /* Setting the continous measurement up to 4k LUX */ | ||
120 | ret_val = (ret_val | 0x05); | ||
121 | else /* Setting the continous measurement up to 64k LUX*/ | ||
122 | ret_val = (ret_val | 0x04); | ||
123 | |||
124 | ret_val = i2c_smbus_write_byte_data(client, 0x81, ret_val); | ||
125 | if (ret_val >= 0) { | ||
126 | /* All OK */ | ||
127 | mutex_unlock(&data->mutex); | ||
128 | return count; | ||
129 | } | ||
130 | fail: | ||
131 | mutex_unlock(&data->mutex); | ||
132 | return ret_val; | ||
133 | } | ||
134 | |||
135 | static ssize_t als_power_status_show(struct device *dev, | ||
136 | struct device_attribute *attr, char *buf) | ||
137 | { | ||
138 | struct i2c_client *client = to_i2c_client(dev); | ||
139 | int ret_val; | ||
140 | ret_val = i2c_smbus_read_byte_data(client, 0x80); | ||
141 | if (ret_val < 0) | ||
142 | return ret_val; | ||
143 | ret_val = ret_val & 0x01; | ||
144 | return sprintf(buf, "%d\n", ret_val); | ||
145 | } | ||
146 | |||
147 | static int als_set_power_state(struct i2c_client *client, bool on_off) | ||
148 | { | ||
149 | int ret_val; | ||
150 | struct als_data *data = i2c_get_clientdata(client); | ||
151 | |||
152 | mutex_lock(&data->mutex); | ||
153 | ret_val = i2c_smbus_read_byte_data(client, 0x80); | ||
154 | if (ret_val < 0) | ||
155 | goto fail; | ||
156 | if (on_off) | ||
157 | ret_val = ret_val | 0x01; | ||
158 | else | ||
159 | ret_val = ret_val & 0xFE; | ||
160 | ret_val = i2c_smbus_write_byte_data(client, 0x80, ret_val); | ||
161 | fail: | ||
162 | mutex_unlock(&data->mutex); | ||
163 | return ret_val; | ||
164 | } | ||
165 | |||
166 | static ssize_t als_power_status_store(struct device *dev, | ||
167 | struct device_attribute *attr, const char *buf, size_t count) | ||
168 | { | ||
169 | struct i2c_client *client = to_i2c_client(dev); | ||
170 | struct als_data *data = i2c_get_clientdata(client); | ||
171 | unsigned long val; | ||
172 | int ret_val; | ||
173 | |||
174 | if (strict_strtoul(buf, 10, &val)) | ||
175 | return -EINVAL; | ||
176 | if (val == POWER_STA_ENABLE) { | ||
177 | ret_val = als_set_power_state(client, true); | ||
178 | data->needresume = true; | ||
179 | } else if (val == POWER_STA_DISABLE) { | ||
180 | ret_val = als_set_power_state(client, false); | ||
181 | data->needresume = false; | ||
182 | } else | ||
183 | return -EINVAL; | ||
184 | if (ret_val < 0) | ||
185 | return ret_val; | ||
186 | return count; | ||
187 | } | ||
188 | |||
189 | static DEVICE_ATTR(lux0_sensor_range, S_IRUGO | S_IWUSR, | ||
190 | als_sensing_range_show, als_sensing_range_store); | ||
191 | static DEVICE_ATTR(lux0_input, S_IRUGO, als_lux0_input_data_show, NULL); | ||
192 | static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR, | ||
193 | als_power_status_show, als_power_status_store); | ||
194 | |||
195 | static struct attribute *mid_att_als[] = { | ||
196 | &dev_attr_lux0_sensor_range.attr, | ||
197 | &dev_attr_lux0_input.attr, | ||
198 | &dev_attr_power_state.attr, | ||
199 | NULL | ||
200 | }; | ||
201 | |||
202 | static struct attribute_group m_als_gr = { | ||
203 | .name = "apds9802als", | ||
204 | .attrs = mid_att_als | ||
205 | }; | ||
206 | |||
207 | static int als_set_default_config(struct i2c_client *client) | ||
208 | { | ||
209 | int ret_val; | ||
210 | /* Write the command and then switch on */ | ||
211 | ret_val = i2c_smbus_write_byte_data(client, 0x80, 0x01); | ||
212 | if (ret_val < 0) { | ||
213 | dev_err(&client->dev, "failed default switch on write\n"); | ||
214 | return ret_val; | ||
215 | } | ||
216 | /* Continous from 1Lux to 64k Lux */ | ||
217 | ret_val = i2c_smbus_write_byte_data(client, 0x81, 0x04); | ||
218 | if (ret_val < 0) | ||
219 | dev_err(&client->dev, "failed default LUX on write\n"); | ||
220 | return ret_val; | ||
221 | } | ||
222 | |||
223 | static int apds9802als_probe(struct i2c_client *client, | ||
224 | const struct i2c_device_id *id) | ||
225 | { | ||
226 | int res; | ||
227 | struct als_data *data; | ||
228 | |||
229 | data = kzalloc(sizeof(struct als_data), GFP_KERNEL); | ||
230 | if (data == NULL) { | ||
231 | dev_err(&client->dev, "Memory allocation failed\n"); | ||
232 | return -ENOMEM; | ||
233 | } | ||
234 | i2c_set_clientdata(client, data); | ||
235 | res = sysfs_create_group(&client->dev.kobj, &m_als_gr); | ||
236 | if (res) { | ||
237 | dev_err(&client->dev, "device create file failed\n"); | ||
238 | goto als_error1; | ||
239 | } | ||
240 | dev_info(&client->dev, | ||
241 | "%s apds9802als: ALS chip found\n", client->name); | ||
242 | als_set_default_config(client); | ||
243 | data->needresume = true; | ||
244 | mutex_init(&data->mutex); | ||
245 | return res; | ||
246 | als_error1: | ||
247 | i2c_set_clientdata(client, NULL); | ||
248 | kfree(data); | ||
249 | return res; | ||
250 | } | ||
251 | |||
252 | static int apds9802als_remove(struct i2c_client *client) | ||
253 | { | ||
254 | struct als_data *data = i2c_get_clientdata(client); | ||
255 | sysfs_remove_group(&client->dev.kobj, &m_als_gr); | ||
256 | kfree(data); | ||
257 | return 0; | ||
258 | } | ||
259 | |||
260 | static int apds9802als_suspend(struct i2c_client *client, pm_message_t mesg) | ||
261 | { | ||
262 | als_set_power_state(client, false); | ||
263 | return 0; | ||
264 | } | ||
265 | |||
266 | static int apds9802als_resume(struct i2c_client *client) | ||
267 | { | ||
268 | struct als_data *data = i2c_get_clientdata(client); | ||
269 | |||
270 | if (data->needresume == true) | ||
271 | als_set_power_state(client, true); | ||
272 | return 0; | ||
273 | } | ||
274 | |||
275 | static struct i2c_device_id apds9802als_id[] = { | ||
276 | { DRIVER_NAME, 0 }, | ||
277 | { } | ||
278 | }; | ||
279 | |||
280 | MODULE_DEVICE_TABLE(i2c, apds9802als_id); | ||
281 | |||
282 | static struct i2c_driver apds9802als_driver = { | ||
283 | .driver = { | ||
284 | .name = DRIVER_NAME, | ||
285 | .owner = THIS_MODULE, | ||
286 | }, | ||
287 | .probe = apds9802als_probe, | ||
288 | .remove = apds9802als_remove, | ||
289 | .suspend = apds9802als_suspend, | ||
290 | .resume = apds9802als_resume, | ||
291 | .id_table = apds9802als_id, | ||
292 | }; | ||
293 | |||
294 | static int __init sensor_apds9802als_init(void) | ||
295 | { | ||
296 | return i2c_add_driver(&apds9802als_driver); | ||
297 | } | ||
298 | |||
299 | static void __exit sensor_apds9802als_exit(void) | ||
300 | { | ||
301 | i2c_del_driver(&apds9802als_driver); | ||
302 | } | ||
303 | module_init(sensor_apds9802als_init); | ||
304 | module_exit(sensor_apds9802als_exit); | ||
305 | |||
306 | MODULE_AUTHOR("Anantha Narayanan <Anantha.Narayanan@intel.com"); | ||
307 | MODULE_DESCRIPTION("Avago apds9802als ALS Driver"); | ||
308 | MODULE_LICENSE("GPL v2"); | ||