Blame view
drivers/misc/apds9802als.c
8.28 KB
22d96aa59
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 |
/* * apds9802als.c - apds9802 ALS Driver * * Copyright (C) 2009 Intel Corp * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * */ #include <linux/module.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/i2c.h> #include <linux/err.h> #include <linux/delay.h> #include <linux/mutex.h> #include <linux/sysfs.h> |
f0cfec111
|
32 |
#include <linux/pm_runtime.h> |
22d96aa59
|
33 34 35 36 37 |
#define ALS_MIN_RANGE_VAL 1 #define ALS_MAX_RANGE_VAL 2 #define POWER_STA_ENABLE 1 #define POWER_STA_DISABLE 0 |
22d96aa59
|
38 39 40 41 |
#define DRIVER_NAME "apds9802als" struct als_data { |
22d96aa59
|
42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 |
struct mutex mutex; }; static ssize_t als_sensing_range_show(struct device *dev, struct device_attribute *attr, char *buf) { struct i2c_client *client = to_i2c_client(dev); int val; val = i2c_smbus_read_byte_data(client, 0x81); if (val < 0) return val; if (val & 1) return sprintf(buf, "4095 "); else return sprintf(buf, "65535 "); } |
f0cfec111
|
61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 |
static int als_wait_for_data_ready(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); int ret; int retry = 10; do { msleep(30); ret = i2c_smbus_read_byte_data(client, 0x86); } while (!(ret & 0x80) && retry--); if (!retry) { dev_warn(dev, "timeout waiting for data ready "); return -ETIMEDOUT; } return 0; } |
22d96aa59
|
80 81 82 83 84 |
static ssize_t als_lux0_input_data_show(struct device *dev, struct device_attribute *attr, char *buf) { struct i2c_client *client = to_i2c_client(dev); struct als_data *data = i2c_get_clientdata(client); |
f0cfec111
|
85 |
int ret_val; |
22d96aa59
|
86 87 88 |
int temp; /* Protect against parallel reads */ |
f0cfec111
|
89 |
pm_runtime_get_sync(dev); |
22d96aa59
|
90 |
mutex_lock(&data->mutex); |
f0cfec111
|
91 92 93 94 95 96 97 98 99 100 101 102 |
/* clear EOC interrupt status */ i2c_smbus_write_byte(client, 0x40); /* start measurement */ temp = i2c_smbus_read_byte_data(client, 0x81); i2c_smbus_write_byte_data(client, 0x81, temp | 0x08); ret_val = als_wait_for_data_ready(dev); if (ret_val < 0) goto failed; temp = i2c_smbus_read_byte_data(client, 0x8C); /* LSB data */ |
22d96aa59
|
103 104 105 106 |
if (temp < 0) { ret_val = temp; goto failed; } |
f0cfec111
|
107 |
ret_val = i2c_smbus_read_byte_data(client, 0x8D); /* MSB data */ |
22d96aa59
|
108 109 |
if (ret_val < 0) goto failed; |
f0cfec111
|
110 |
|
22d96aa59
|
111 |
mutex_unlock(&data->mutex); |
f0cfec111
|
112 113 114 115 116 |
pm_runtime_put_sync(dev); temp = (ret_val << 8) | temp; return sprintf(buf, "%d ", temp); |
22d96aa59
|
117 118 |
failed: mutex_unlock(&data->mutex); |
f0cfec111
|
119 |
pm_runtime_put_sync(dev); |
22d96aa59
|
120 121 122 123 124 125 126 127 |
return ret_val; } static ssize_t als_sensing_range_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct i2c_client *client = to_i2c_client(dev); struct als_data *data = i2c_get_clientdata(client); |
1093736b3
|
128 |
int ret_val; |
22d96aa59
|
129 130 131 132 133 134 135 136 137 138 139 |
unsigned long val; if (strict_strtoul(buf, 10, &val)) return -EINVAL; if (val < 4096) val = 1; else if (val < 65536) val = 2; else return -ERANGE; |
f0cfec111
|
140 |
pm_runtime_get_sync(dev); |
22d96aa59
|
141 142 |
/* Make sure nobody else reads/modifies/writes 0x81 while we are active */ |
22d96aa59
|
143 144 145 146 147 148 149 150 |
mutex_lock(&data->mutex); ret_val = i2c_smbus_read_byte_data(client, 0x81); if (ret_val < 0) goto fail; /* Reset the bits before setting them */ ret_val = ret_val & 0xFA; |
f0cfec111
|
151 152 153 154 |
if (val == 1) /* Setting detection range up to 4k LUX */ ret_val = (ret_val | 0x01); else /* Setting detection range up to 64k LUX*/ ret_val = (ret_val | 0x00); |
22d96aa59
|
155 156 |
ret_val = i2c_smbus_write_byte_data(client, 0x81, ret_val); |
f0cfec111
|
157 |
|
22d96aa59
|
158 159 160 |
if (ret_val >= 0) { /* All OK */ mutex_unlock(&data->mutex); |
f0cfec111
|
161 |
pm_runtime_put_sync(dev); |
22d96aa59
|
162 163 164 165 |
return count; } fail: mutex_unlock(&data->mutex); |
f0cfec111
|
166 |
pm_runtime_put_sync(dev); |
22d96aa59
|
167 168 |
return ret_val; } |
22d96aa59
|
169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 |
static int als_set_power_state(struct i2c_client *client, bool on_off) { int ret_val; struct als_data *data = i2c_get_clientdata(client); mutex_lock(&data->mutex); ret_val = i2c_smbus_read_byte_data(client, 0x80); if (ret_val < 0) goto fail; if (on_off) ret_val = ret_val | 0x01; else ret_val = ret_val & 0xFE; ret_val = i2c_smbus_write_byte_data(client, 0x80, ret_val); fail: mutex_unlock(&data->mutex); return ret_val; } |
22d96aa59
|
187 188 189 |
static DEVICE_ATTR(lux0_sensor_range, S_IRUGO | S_IWUSR, als_sensing_range_show, als_sensing_range_store); static DEVICE_ATTR(lux0_input, S_IRUGO, als_lux0_input_data_show, NULL); |
22d96aa59
|
190 191 192 193 |
static struct attribute *mid_att_als[] = { &dev_attr_lux0_sensor_range.attr, &dev_attr_lux0_input.attr, |
22d96aa59
|
194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 |
NULL }; static struct attribute_group m_als_gr = { .name = "apds9802als", .attrs = mid_att_als }; static int als_set_default_config(struct i2c_client *client) { int ret_val; /* Write the command and then switch on */ ret_val = i2c_smbus_write_byte_data(client, 0x80, 0x01); if (ret_val < 0) { dev_err(&client->dev, "failed default switch on write "); return ret_val; } |
f0cfec111
|
212 213 |
/* detection range: 1~64K Lux, maunal measurement */ ret_val = i2c_smbus_write_byte_data(client, 0x81, 0x08); |
22d96aa59
|
214 215 216 |
if (ret_val < 0) dev_err(&client->dev, "failed default LUX on write "); |
f0cfec111
|
217 218 219 220 221 |
/* We always get 0 for the 1st measurement after system power on, * so make sure it is finished before user asks for data. */ als_wait_for_data_ready(&client->dev); |
22d96aa59
|
222 223 |
return ret_val; } |
f0cfec111
|
224 225 |
static int apds9802als_probe(struct i2c_client *client, const struct i2c_device_id *id) |
22d96aa59
|
226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 |
{ int res; struct als_data *data; data = kzalloc(sizeof(struct als_data), GFP_KERNEL); if (data == NULL) { dev_err(&client->dev, "Memory allocation failed "); return -ENOMEM; } i2c_set_clientdata(client, data); res = sysfs_create_group(&client->dev.kobj, &m_als_gr); if (res) { dev_err(&client->dev, "device create file failed "); goto als_error1; } |
f0cfec111
|
243 244 |
dev_info(&client->dev, "ALS chip found "); |
22d96aa59
|
245 |
als_set_default_config(client); |
22d96aa59
|
246 |
mutex_init(&data->mutex); |
f0cfec111
|
247 |
|
4e6735992
|
248 |
pm_runtime_set_active(&client->dev); |
f0cfec111
|
249 |
pm_runtime_enable(&client->dev); |
f0cfec111
|
250 |
|
22d96aa59
|
251 252 |
return res; als_error1: |
22d96aa59
|
253 254 255 |
kfree(data); return res; } |
4e6735992
|
256 |
static int __devexit apds9802als_remove(struct i2c_client *client) |
22d96aa59
|
257 258 |
{ struct als_data *data = i2c_get_clientdata(client); |
f0cfec111
|
259 |
|
4e6735992
|
260 |
pm_runtime_get_sync(&client->dev); |
f0cfec111
|
261 |
als_set_power_state(client, false); |
22d96aa59
|
262 |
sysfs_remove_group(&client->dev.kobj, &m_als_gr); |
4e6735992
|
263 264 265 266 |
pm_runtime_disable(&client->dev); pm_runtime_set_suspended(&client->dev); pm_runtime_put_noidle(&client->dev); |
22d96aa59
|
267 268 269 |
kfree(data); return 0; } |
f0cfec111
|
270 |
#ifdef CONFIG_PM |
22d96aa59
|
271 272 273 274 275 276 277 278 |
static int apds9802als_suspend(struct i2c_client *client, pm_message_t mesg) { als_set_power_state(client, false); return 0; } static int apds9802als_resume(struct i2c_client *client) { |
f0cfec111
|
279 |
als_set_default_config(client); |
22d96aa59
|
280 281 |
return 0; } |
f0cfec111
|
282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 |
static int apds9802als_runtime_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); als_set_power_state(client, false); return 0; } static int apds9802als_runtime_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); als_set_power_state(client, true); return 0; } static const struct dev_pm_ops apds9802als_pm_ops = { .runtime_suspend = apds9802als_runtime_suspend, .runtime_resume = apds9802als_runtime_resume, }; #define APDS9802ALS_PM_OPS (&apds9802als_pm_ops) #else /* CONFIG_PM */ #define apds9802als_suspend NULL #define apds9802als_resume NULL #define APDS9802ALS_PM_OPS NULL #endif /* CONFIG_PM */ |
22d96aa59
|
310 311 312 313 314 315 316 317 318 |
static struct i2c_device_id apds9802als_id[] = { { DRIVER_NAME, 0 }, { } }; MODULE_DEVICE_TABLE(i2c, apds9802als_id); static struct i2c_driver apds9802als_driver = { .driver = { |
f0cfec111
|
319 320 |
.name = DRIVER_NAME, .pm = APDS9802ALS_PM_OPS, |
22d96aa59
|
321 322 |
}, .probe = apds9802als_probe, |
4e6735992
|
323 |
.remove = __devexit_p(apds9802als_remove), |
22d96aa59
|
324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 |
.suspend = apds9802als_suspend, .resume = apds9802als_resume, .id_table = apds9802als_id, }; static int __init sensor_apds9802als_init(void) { return i2c_add_driver(&apds9802als_driver); } static void __exit sensor_apds9802als_exit(void) { i2c_del_driver(&apds9802als_driver); } module_init(sensor_apds9802als_init); module_exit(sensor_apds9802als_exit); MODULE_AUTHOR("Anantha Narayanan <Anantha.Narayanan@intel.com"); MODULE_DESCRIPTION("Avago apds9802als ALS Driver"); MODULE_LICENSE("GPL v2"); |