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28#include <linux/module.h>
29#include <linux/init.h>
30#include <linux/slab.h>
31#include <linux/i2c.h>
32#include <linux/mutex.h>
33#include <linux/delay.h>
34
35#define ISL29003_DRV_NAME "isl29003"
36#define DRIVER_VERSION "1.0"
37
38#define ISL29003_REG_COMMAND 0x00
39#define ISL29003_ADC_ENABLED (1 << 7)
40#define ISL29003_ADC_PD (1 << 6)
41#define ISL29003_TIMING_INT (1 << 5)
42#define ISL29003_MODE_SHIFT (2)
43#define ISL29003_MODE_MASK (0x3 << ISL29003_MODE_SHIFT)
44#define ISL29003_RES_SHIFT (0)
45#define ISL29003_RES_MASK (0x3 << ISL29003_RES_SHIFT)
46
47#define ISL29003_REG_CONTROL 0x01
48#define ISL29003_INT_FLG (1 << 5)
49#define ISL29003_RANGE_SHIFT (2)
50#define ISL29003_RANGE_MASK (0x3 << ISL29003_RANGE_SHIFT)
51#define ISL29003_INT_PERSISTS_SHIFT (0)
52#define ISL29003_INT_PERSISTS_MASK (0xf << ISL29003_INT_PERSISTS_SHIFT)
53
54#define ISL29003_REG_IRQ_THRESH_HI 0x02
55#define ISL29003_REG_IRQ_THRESH_LO 0x03
56#define ISL29003_REG_LSB_SENSOR 0x04
57#define ISL29003_REG_MSB_SENSOR 0x05
58#define ISL29003_REG_LSB_TIMER 0x06
59#define ISL29003_REG_MSB_TIMER 0x07
60
61#define ISL29003_NUM_CACHABLE_REGS 4
62
63struct isl29003_data {
64 struct i2c_client *client;
65 struct mutex lock;
66 u8 reg_cache[ISL29003_NUM_CACHABLE_REGS];
67 u8 power_state_before_suspend;
68};
69
70static int gain_range[] = {
71 1000, 4000, 16000, 64000
72};
73
74
75
76
77
78static int __isl29003_read_reg(struct i2c_client *client,
79 u32 reg, u8 mask, u8 shift)
80{
81 struct isl29003_data *data = i2c_get_clientdata(client);
82 return (data->reg_cache[reg] & mask) >> shift;
83}
84
85static int __isl29003_write_reg(struct i2c_client *client,
86 u32 reg, u8 mask, u8 shift, u8 val)
87{
88 struct isl29003_data *data = i2c_get_clientdata(client);
89 int ret = 0;
90 u8 tmp;
91
92 if (reg >= ISL29003_NUM_CACHABLE_REGS)
93 return -EINVAL;
94
95 mutex_lock(&data->lock);
96
97 tmp = data->reg_cache[reg];
98 tmp &= ~mask;
99 tmp |= val << shift;
100
101 ret = i2c_smbus_write_byte_data(client, reg, tmp);
102 if (!ret)
103 data->reg_cache[reg] = tmp;
104
105 mutex_unlock(&data->lock);
106 return ret;
107}
108
109
110
111
112
113
114static int isl29003_get_range(struct i2c_client *client)
115{
116 return __isl29003_read_reg(client, ISL29003_REG_CONTROL,
117 ISL29003_RANGE_MASK, ISL29003_RANGE_SHIFT);
118}
119
120static int isl29003_set_range(struct i2c_client *client, int range)
121{
122 return __isl29003_write_reg(client, ISL29003_REG_CONTROL,
123 ISL29003_RANGE_MASK, ISL29003_RANGE_SHIFT, range);
124}
125
126
127static int isl29003_get_resolution(struct i2c_client *client)
128{
129 return __isl29003_read_reg(client, ISL29003_REG_COMMAND,
130 ISL29003_RES_MASK, ISL29003_RES_SHIFT);
131}
132
133static int isl29003_set_resolution(struct i2c_client *client, int res)
134{
135 return __isl29003_write_reg(client, ISL29003_REG_COMMAND,
136 ISL29003_RES_MASK, ISL29003_RES_SHIFT, res);
137}
138
139
140static int isl29003_get_mode(struct i2c_client *client)
141{
142 return __isl29003_read_reg(client, ISL29003_REG_COMMAND,
143 ISL29003_RES_MASK, ISL29003_RES_SHIFT);
144}
145
146static int isl29003_set_mode(struct i2c_client *client, int mode)
147{
148 return __isl29003_write_reg(client, ISL29003_REG_COMMAND,
149 ISL29003_RES_MASK, ISL29003_RES_SHIFT, mode);
150}
151
152
153static int isl29003_set_power_state(struct i2c_client *client, int state)
154{
155 return __isl29003_write_reg(client, ISL29003_REG_COMMAND,
156 ISL29003_ADC_ENABLED | ISL29003_ADC_PD, 0,
157 state ? ISL29003_ADC_ENABLED : ISL29003_ADC_PD);
158}
159
160static int isl29003_get_power_state(struct i2c_client *client)
161{
162 struct isl29003_data *data = i2c_get_clientdata(client);
163 u8 cmdreg = data->reg_cache[ISL29003_REG_COMMAND];
164 return ~cmdreg & ISL29003_ADC_PD;
165}
166
167static int isl29003_get_adc_value(struct i2c_client *client)
168{
169 struct isl29003_data *data = i2c_get_clientdata(client);
170 int lsb, msb, range, bitdepth;
171
172 mutex_lock(&data->lock);
173 lsb = i2c_smbus_read_byte_data(client, ISL29003_REG_LSB_SENSOR);
174
175 if (lsb < 0) {
176 mutex_unlock(&data->lock);
177 return lsb;
178 }
179
180 msb = i2c_smbus_read_byte_data(client, ISL29003_REG_MSB_SENSOR);
181 mutex_unlock(&data->lock);
182
183 if (msb < 0)
184 return msb;
185
186 range = isl29003_get_range(client);
187 bitdepth = (4 - isl29003_get_resolution(client)) * 4;
188 return (((msb << 8) | lsb) * gain_range[range]) >> bitdepth;
189}
190
191
192
193
194
195
196static ssize_t isl29003_show_range(struct device *dev,
197 struct device_attribute *attr, char *buf)
198{
199 struct i2c_client *client = to_i2c_client(dev);
200 return sprintf(buf, "%i\n", isl29003_get_range(client));
201}
202
203static ssize_t isl29003_store_range(struct device *dev,
204 struct device_attribute *attr,
205 const char *buf, size_t count)
206{
207 struct i2c_client *client = to_i2c_client(dev);
208 unsigned long val;
209 int ret;
210
211 if ((strict_strtoul(buf, 10, &val) < 0) || (val > 3))
212 return -EINVAL;
213
214 ret = isl29003_set_range(client, val);
215 if (ret < 0)
216 return ret;
217
218 return count;
219}
220
221static DEVICE_ATTR(range, S_IWUSR | S_IRUGO,
222 isl29003_show_range, isl29003_store_range);
223
224
225
226static ssize_t isl29003_show_resolution(struct device *dev,
227 struct device_attribute *attr,
228 char *buf)
229{
230 struct i2c_client *client = to_i2c_client(dev);
231 return sprintf(buf, "%d\n", isl29003_get_resolution(client));
232}
233
234static ssize_t isl29003_store_resolution(struct device *dev,
235 struct device_attribute *attr,
236 const char *buf, size_t count)
237{
238 struct i2c_client *client = to_i2c_client(dev);
239 unsigned long val;
240 int ret;
241
242 if ((strict_strtoul(buf, 10, &val) < 0) || (val > 3))
243 return -EINVAL;
244
245 ret = isl29003_set_resolution(client, val);
246 if (ret < 0)
247 return ret;
248
249 return count;
250}
251
252static DEVICE_ATTR(resolution, S_IWUSR | S_IRUGO,
253 isl29003_show_resolution, isl29003_store_resolution);
254
255
256static ssize_t isl29003_show_mode(struct device *dev,
257 struct device_attribute *attr, char *buf)
258{
259 struct i2c_client *client = to_i2c_client(dev);
260 return sprintf(buf, "%d\n", isl29003_get_mode(client));
261}
262
263static ssize_t isl29003_store_mode(struct device *dev,
264 struct device_attribute *attr, const char *buf, size_t count)
265{
266 struct i2c_client *client = to_i2c_client(dev);
267 unsigned long val;
268 int ret;
269
270 if ((strict_strtoul(buf, 10, &val) < 0) || (val > 2))
271 return -EINVAL;
272
273 ret = isl29003_set_mode(client, val);
274 if (ret < 0)
275 return ret;
276
277 return count;
278}
279
280static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO,
281 isl29003_show_mode, isl29003_store_mode);
282
283
284
285static ssize_t isl29003_show_power_state(struct device *dev,
286 struct device_attribute *attr,
287 char *buf)
288{
289 struct i2c_client *client = to_i2c_client(dev);
290 return sprintf(buf, "%d\n", isl29003_get_power_state(client));
291}
292
293static ssize_t isl29003_store_power_state(struct device *dev,
294 struct device_attribute *attr,
295 const char *buf, size_t count)
296{
297 struct i2c_client *client = to_i2c_client(dev);
298 unsigned long val;
299 int ret;
300
301 if ((strict_strtoul(buf, 10, &val) < 0) || (val > 1))
302 return -EINVAL;
303
304 ret = isl29003_set_power_state(client, val);
305 return ret ? ret : count;
306}
307
308static DEVICE_ATTR(power_state, S_IWUSR | S_IRUGO,
309 isl29003_show_power_state, isl29003_store_power_state);
310
311
312
313static ssize_t isl29003_show_lux(struct device *dev,
314 struct device_attribute *attr, char *buf)
315{
316 struct i2c_client *client = to_i2c_client(dev);
317
318
319 if (!isl29003_get_power_state(client))
320 return -EBUSY;
321
322 return sprintf(buf, "%d\n", isl29003_get_adc_value(client));
323}
324
325static DEVICE_ATTR(lux, S_IRUGO, isl29003_show_lux, NULL);
326
327static struct attribute *isl29003_attributes[] = {
328 &dev_attr_range.attr,
329 &dev_attr_resolution.attr,
330 &dev_attr_mode.attr,
331 &dev_attr_power_state.attr,
332 &dev_attr_lux.attr,
333 NULL
334};
335
336static const struct attribute_group isl29003_attr_group = {
337 .attrs = isl29003_attributes,
338};
339
340static int isl29003_init_client(struct i2c_client *client)
341{
342 struct isl29003_data *data = i2c_get_clientdata(client);
343 int i;
344
345
346
347 for (i = 0; i < ARRAY_SIZE(data->reg_cache); i++) {
348 int v = i2c_smbus_read_byte_data(client, i);
349 if (v < 0)
350 return -ENODEV;
351
352 data->reg_cache[i] = v;
353 }
354
355
356 isl29003_set_range(client, 0);
357 isl29003_set_resolution(client, 0);
358 isl29003_set_mode(client, 0);
359 isl29003_set_power_state(client, 0);
360
361 return 0;
362}
363
364
365
366
367
368static int __devinit isl29003_probe(struct i2c_client *client,
369 const struct i2c_device_id *id)
370{
371 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
372 struct isl29003_data *data;
373 int err = 0;
374
375 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
376 return -EIO;
377
378 data = kzalloc(sizeof(struct isl29003_data), GFP_KERNEL);
379 if (!data)
380 return -ENOMEM;
381
382 data->client = client;
383 i2c_set_clientdata(client, data);
384 mutex_init(&data->lock);
385
386
387 err = isl29003_init_client(client);
388 if (err)
389 goto exit_kfree;
390
391
392 err = sysfs_create_group(&client->dev.kobj, &isl29003_attr_group);
393 if (err)
394 goto exit_kfree;
395
396 dev_info(&client->dev, "driver version %s enabled\n", DRIVER_VERSION);
397 return 0;
398
399exit_kfree:
400 kfree(data);
401 return err;
402}
403
404static int __devexit isl29003_remove(struct i2c_client *client)
405{
406 sysfs_remove_group(&client->dev.kobj, &isl29003_attr_group);
407 isl29003_set_power_state(client, 0);
408 kfree(i2c_get_clientdata(client));
409 return 0;
410}
411
412#ifdef CONFIG_PM
413static int isl29003_suspend(struct i2c_client *client, pm_message_t mesg)
414{
415 struct isl29003_data *data = i2c_get_clientdata(client);
416
417 data->power_state_before_suspend = isl29003_get_power_state(client);
418 return isl29003_set_power_state(client, 0);
419}
420
421static int isl29003_resume(struct i2c_client *client)
422{
423 int i;
424 struct isl29003_data *data = i2c_get_clientdata(client);
425
426
427 for (i = 0; i < ARRAY_SIZE(data->reg_cache); i++)
428 if (i2c_smbus_write_byte_data(client, i, data->reg_cache[i]))
429 return -EIO;
430
431 return isl29003_set_power_state(client,
432 data->power_state_before_suspend);
433}
434
435#else
436#define isl29003_suspend NULL
437#define isl29003_resume NULL
438#endif
439
440static const struct i2c_device_id isl29003_id[] = {
441 { "isl29003", 0 },
442 {}
443};
444MODULE_DEVICE_TABLE(i2c, isl29003_id);
445
446static struct i2c_driver isl29003_driver = {
447 .driver = {
448 .name = ISL29003_DRV_NAME,
449 .owner = THIS_MODULE,
450 },
451 .suspend = isl29003_suspend,
452 .resume = isl29003_resume,
453 .probe = isl29003_probe,
454 .remove = __devexit_p(isl29003_remove),
455 .id_table = isl29003_id,
456};
457
458static int __init isl29003_init(void)
459{
460 return i2c_add_driver(&isl29003_driver);
461}
462
463static void __exit isl29003_exit(void)
464{
465 i2c_del_driver(&isl29003_driver);
466}
467
468MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
469MODULE_DESCRIPTION("ISL29003 ambient light sensor driver");
470MODULE_LICENSE("GPL v2");
471MODULE_VERSION(DRIVER_VERSION);
472
473module_init(isl29003_init);
474module_exit(isl29003_exit);
475
476
