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1/*
2 * isl29003.c - Linux kernel module for
3 * Intersil ISL29003 ambient light sensor
4 *
5 * See file:Documentation/misc-devices/isl29003
6 *
7 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
8 *
9 * Based on code written by
10 * Rodolfo Giometti <giometti@linux.it>
11 * Eurotech S.p.A. <info@eurotech.it>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 */
27
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 * register access helpers
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 * internally used functions
111 */
112
113/* range */
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/* resolution */
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/* mode */
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/* power_state */
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 * sysfs layer
193 */
194
195/* range */
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/* resolution */
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/* mode */
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/* power state */
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/* lux */
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 /* No LUX data if not operational */
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 /* read all the registers once to fill the cache.
346 * if one of the reads fails, we consider the init failed */
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 /* set defaults */
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 * I2C layer
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 /* initialize the ISL29003 chip */
387 err = isl29003_init_client(client);
388 if (err)
389 goto exit_kfree;
390
391 /* register sysfs hooks */
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 /* restore registers from cache */
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 /* CONFIG_PM */
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
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * isl29003.c - Linux kernel module for
4 * Intersil ISL29003 ambient light sensor
5 *
6 * See file:Documentation/misc-devices/isl29003.rst
7 *
8 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
9 *
10 * Based on code written by
11 * Rodolfo Giometti <giometti@linux.it>
12 * Eurotech S.p.A. <info@eurotech.it>
13 */
14
15#include <linux/module.h>
16#include <linux/slab.h>
17#include <linux/i2c.h>
18#include <linux/mutex.h>
19#include <linux/delay.h>
20
21#define ISL29003_DRV_NAME "isl29003"
22#define DRIVER_VERSION "1.0"
23
24#define ISL29003_REG_COMMAND 0x00
25#define ISL29003_ADC_ENABLED (1 << 7)
26#define ISL29003_ADC_PD (1 << 6)
27#define ISL29003_TIMING_INT (1 << 5)
28#define ISL29003_MODE_SHIFT (2)
29#define ISL29003_MODE_MASK (0x3 << ISL29003_MODE_SHIFT)
30#define ISL29003_RES_SHIFT (0)
31#define ISL29003_RES_MASK (0x3 << ISL29003_RES_SHIFT)
32
33#define ISL29003_REG_CONTROL 0x01
34#define ISL29003_INT_FLG (1 << 5)
35#define ISL29003_RANGE_SHIFT (2)
36#define ISL29003_RANGE_MASK (0x3 << ISL29003_RANGE_SHIFT)
37#define ISL29003_INT_PERSISTS_SHIFT (0)
38#define ISL29003_INT_PERSISTS_MASK (0xf << ISL29003_INT_PERSISTS_SHIFT)
39
40#define ISL29003_REG_IRQ_THRESH_HI 0x02
41#define ISL29003_REG_IRQ_THRESH_LO 0x03
42#define ISL29003_REG_LSB_SENSOR 0x04
43#define ISL29003_REG_MSB_SENSOR 0x05
44#define ISL29003_REG_LSB_TIMER 0x06
45#define ISL29003_REG_MSB_TIMER 0x07
46
47#define ISL29003_NUM_CACHABLE_REGS 4
48
49struct isl29003_data {
50 struct i2c_client *client;
51 struct mutex lock;
52 u8 reg_cache[ISL29003_NUM_CACHABLE_REGS];
53 u8 power_state_before_suspend;
54};
55
56static int gain_range[] = {
57 1000, 4000, 16000, 64000
58};
59
60/*
61 * register access helpers
62 */
63
64static int __isl29003_read_reg(struct i2c_client *client,
65 u32 reg, u8 mask, u8 shift)
66{
67 struct isl29003_data *data = i2c_get_clientdata(client);
68
69 return (data->reg_cache[reg] & mask) >> shift;
70}
71
72static int __isl29003_write_reg(struct i2c_client *client,
73 u32 reg, u8 mask, u8 shift, u8 val)
74{
75 struct isl29003_data *data = i2c_get_clientdata(client);
76 int ret = 0;
77 u8 tmp;
78
79 if (reg >= ISL29003_NUM_CACHABLE_REGS)
80 return -EINVAL;
81
82 mutex_lock(&data->lock);
83
84 tmp = data->reg_cache[reg];
85 tmp &= ~mask;
86 tmp |= val << shift;
87
88 ret = i2c_smbus_write_byte_data(client, reg, tmp);
89 if (!ret)
90 data->reg_cache[reg] = tmp;
91
92 mutex_unlock(&data->lock);
93 return ret;
94}
95
96/*
97 * internally used functions
98 */
99
100/* range */
101static int isl29003_get_range(struct i2c_client *client)
102{
103 return __isl29003_read_reg(client, ISL29003_REG_CONTROL,
104 ISL29003_RANGE_MASK, ISL29003_RANGE_SHIFT);
105}
106
107static int isl29003_set_range(struct i2c_client *client, int range)
108{
109 return __isl29003_write_reg(client, ISL29003_REG_CONTROL,
110 ISL29003_RANGE_MASK, ISL29003_RANGE_SHIFT, range);
111}
112
113/* resolution */
114static int isl29003_get_resolution(struct i2c_client *client)
115{
116 return __isl29003_read_reg(client, ISL29003_REG_COMMAND,
117 ISL29003_RES_MASK, ISL29003_RES_SHIFT);
118}
119
120static int isl29003_set_resolution(struct i2c_client *client, int res)
121{
122 return __isl29003_write_reg(client, ISL29003_REG_COMMAND,
123 ISL29003_RES_MASK, ISL29003_RES_SHIFT, res);
124}
125
126/* mode */
127static int isl29003_get_mode(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_mode(struct i2c_client *client, int mode)
134{
135 return __isl29003_write_reg(client, ISL29003_REG_COMMAND,
136 ISL29003_RES_MASK, ISL29003_RES_SHIFT, mode);
137}
138
139/* power_state */
140static int isl29003_set_power_state(struct i2c_client *client, int state)
141{
142 return __isl29003_write_reg(client, ISL29003_REG_COMMAND,
143 ISL29003_ADC_ENABLED | ISL29003_ADC_PD, 0,
144 state ? ISL29003_ADC_ENABLED : ISL29003_ADC_PD);
145}
146
147static int isl29003_get_power_state(struct i2c_client *client)
148{
149 struct isl29003_data *data = i2c_get_clientdata(client);
150 u8 cmdreg = data->reg_cache[ISL29003_REG_COMMAND];
151
152 return ~cmdreg & ISL29003_ADC_PD;
153}
154
155static int isl29003_get_adc_value(struct i2c_client *client)
156{
157 struct isl29003_data *data = i2c_get_clientdata(client);
158 int lsb, msb, range, bitdepth;
159
160 mutex_lock(&data->lock);
161 lsb = i2c_smbus_read_byte_data(client, ISL29003_REG_LSB_SENSOR);
162
163 if (lsb < 0) {
164 mutex_unlock(&data->lock);
165 return lsb;
166 }
167
168 msb = i2c_smbus_read_byte_data(client, ISL29003_REG_MSB_SENSOR);
169 mutex_unlock(&data->lock);
170
171 if (msb < 0)
172 return msb;
173
174 range = isl29003_get_range(client);
175 bitdepth = (4 - isl29003_get_resolution(client)) * 4;
176 return (((msb << 8) | lsb) * gain_range[range]) >> bitdepth;
177}
178
179/*
180 * sysfs layer
181 */
182
183/* range */
184static ssize_t isl29003_show_range(struct device *dev,
185 struct device_attribute *attr, char *buf)
186{
187 struct i2c_client *client = to_i2c_client(dev);
188
189 return sprintf(buf, "%i\n", isl29003_get_range(client));
190}
191
192static ssize_t isl29003_store_range(struct device *dev,
193 struct device_attribute *attr,
194 const char *buf, size_t count)
195{
196 struct i2c_client *client = to_i2c_client(dev);
197 unsigned long val;
198 int ret;
199
200 ret = kstrtoul(buf, 10, &val);
201 if (ret)
202 return ret;
203
204 if (val > 3)
205 return -EINVAL;
206
207 ret = isl29003_set_range(client, val);
208 if (ret < 0)
209 return ret;
210
211 return count;
212}
213
214static DEVICE_ATTR(range, S_IWUSR | S_IRUGO,
215 isl29003_show_range, isl29003_store_range);
216
217
218/* resolution */
219static ssize_t isl29003_show_resolution(struct device *dev,
220 struct device_attribute *attr,
221 char *buf)
222{
223 struct i2c_client *client = to_i2c_client(dev);
224
225 return sprintf(buf, "%d\n", isl29003_get_resolution(client));
226}
227
228static ssize_t isl29003_store_resolution(struct device *dev,
229 struct device_attribute *attr,
230 const char *buf, size_t count)
231{
232 struct i2c_client *client = to_i2c_client(dev);
233 unsigned long val;
234 int ret;
235
236 ret = kstrtoul(buf, 10, &val);
237 if (ret)
238 return ret;
239
240 if (val > 3)
241 return -EINVAL;
242
243 ret = isl29003_set_resolution(client, val);
244 if (ret < 0)
245 return ret;
246
247 return count;
248}
249
250static DEVICE_ATTR(resolution, S_IWUSR | S_IRUGO,
251 isl29003_show_resolution, isl29003_store_resolution);
252
253/* mode */
254static ssize_t isl29003_show_mode(struct device *dev,
255 struct device_attribute *attr, char *buf)
256{
257 struct i2c_client *client = to_i2c_client(dev);
258
259 return sprintf(buf, "%d\n", isl29003_get_mode(client));
260}
261
262static ssize_t isl29003_store_mode(struct device *dev,
263 struct device_attribute *attr, const char *buf, size_t count)
264{
265 struct i2c_client *client = to_i2c_client(dev);
266 unsigned long val;
267 int ret;
268
269 ret = kstrtoul(buf, 10, &val);
270 if (ret)
271 return ret;
272
273 if (val > 2)
274 return -EINVAL;
275
276 ret = isl29003_set_mode(client, val);
277 if (ret < 0)
278 return ret;
279
280 return count;
281}
282
283static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO,
284 isl29003_show_mode, isl29003_store_mode);
285
286
287/* power state */
288static ssize_t isl29003_show_power_state(struct device *dev,
289 struct device_attribute *attr,
290 char *buf)
291{
292 struct i2c_client *client = to_i2c_client(dev);
293
294 return sprintf(buf, "%d\n", isl29003_get_power_state(client));
295}
296
297static ssize_t isl29003_store_power_state(struct device *dev,
298 struct device_attribute *attr,
299 const char *buf, size_t count)
300{
301 struct i2c_client *client = to_i2c_client(dev);
302 unsigned long val;
303 int ret;
304
305 ret = kstrtoul(buf, 10, &val);
306 if (ret)
307 return ret;
308
309 if (val > 1)
310 return -EINVAL;
311
312 ret = isl29003_set_power_state(client, val);
313 return ret ? ret : count;
314}
315
316static DEVICE_ATTR(power_state, S_IWUSR | S_IRUGO,
317 isl29003_show_power_state, isl29003_store_power_state);
318
319
320/* lux */
321static ssize_t isl29003_show_lux(struct device *dev,
322 struct device_attribute *attr, char *buf)
323{
324 struct i2c_client *client = to_i2c_client(dev);
325
326 /* No LUX data if not operational */
327 if (!isl29003_get_power_state(client))
328 return -EBUSY;
329
330 return sprintf(buf, "%d\n", isl29003_get_adc_value(client));
331}
332
333static DEVICE_ATTR(lux, S_IRUGO, isl29003_show_lux, NULL);
334
335static struct attribute *isl29003_attributes[] = {
336 &dev_attr_range.attr,
337 &dev_attr_resolution.attr,
338 &dev_attr_mode.attr,
339 &dev_attr_power_state.attr,
340 &dev_attr_lux.attr,
341 NULL
342};
343
344static const struct attribute_group isl29003_attr_group = {
345 .attrs = isl29003_attributes,
346};
347
348static int isl29003_init_client(struct i2c_client *client)
349{
350 struct isl29003_data *data = i2c_get_clientdata(client);
351 int i;
352
353 /* read all the registers once to fill the cache.
354 * if one of the reads fails, we consider the init failed */
355 for (i = 0; i < ARRAY_SIZE(data->reg_cache); i++) {
356 int v = i2c_smbus_read_byte_data(client, i);
357
358 if (v < 0)
359 return -ENODEV;
360
361 data->reg_cache[i] = v;
362 }
363
364 /* set defaults */
365 isl29003_set_range(client, 0);
366 isl29003_set_resolution(client, 0);
367 isl29003_set_mode(client, 0);
368 isl29003_set_power_state(client, 0);
369
370 return 0;
371}
372
373/*
374 * I2C layer
375 */
376
377static int isl29003_probe(struct i2c_client *client,
378 const struct i2c_device_id *id)
379{
380 struct i2c_adapter *adapter = client->adapter;
381 struct isl29003_data *data;
382 int err = 0;
383
384 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
385 return -EIO;
386
387 data = kzalloc(sizeof(struct isl29003_data), GFP_KERNEL);
388 if (!data)
389 return -ENOMEM;
390
391 data->client = client;
392 i2c_set_clientdata(client, data);
393 mutex_init(&data->lock);
394
395 /* initialize the ISL29003 chip */
396 err = isl29003_init_client(client);
397 if (err)
398 goto exit_kfree;
399
400 /* register sysfs hooks */
401 err = sysfs_create_group(&client->dev.kobj, &isl29003_attr_group);
402 if (err)
403 goto exit_kfree;
404
405 dev_info(&client->dev, "driver version %s enabled\n", DRIVER_VERSION);
406 return 0;
407
408exit_kfree:
409 kfree(data);
410 return err;
411}
412
413static int isl29003_remove(struct i2c_client *client)
414{
415 sysfs_remove_group(&client->dev.kobj, &isl29003_attr_group);
416 isl29003_set_power_state(client, 0);
417 kfree(i2c_get_clientdata(client));
418 return 0;
419}
420
421#ifdef CONFIG_PM_SLEEP
422static int isl29003_suspend(struct device *dev)
423{
424 struct i2c_client *client = to_i2c_client(dev);
425 struct isl29003_data *data = i2c_get_clientdata(client);
426
427 data->power_state_before_suspend = isl29003_get_power_state(client);
428 return isl29003_set_power_state(client, 0);
429}
430
431static int isl29003_resume(struct device *dev)
432{
433 int i;
434 struct i2c_client *client = to_i2c_client(dev);
435 struct isl29003_data *data = i2c_get_clientdata(client);
436
437 /* restore registers from cache */
438 for (i = 0; i < ARRAY_SIZE(data->reg_cache); i++)
439 if (i2c_smbus_write_byte_data(client, i, data->reg_cache[i]))
440 return -EIO;
441
442 return isl29003_set_power_state(client,
443 data->power_state_before_suspend);
444}
445
446static SIMPLE_DEV_PM_OPS(isl29003_pm_ops, isl29003_suspend, isl29003_resume);
447#define ISL29003_PM_OPS (&isl29003_pm_ops)
448
449#else
450#define ISL29003_PM_OPS NULL
451#endif /* CONFIG_PM_SLEEP */
452
453static const struct i2c_device_id isl29003_id[] = {
454 { "isl29003", 0 },
455 {}
456};
457MODULE_DEVICE_TABLE(i2c, isl29003_id);
458
459static struct i2c_driver isl29003_driver = {
460 .driver = {
461 .name = ISL29003_DRV_NAME,
462 .pm = ISL29003_PM_OPS,
463 },
464 .probe = isl29003_probe,
465 .remove = isl29003_remove,
466 .id_table = isl29003_id,
467};
468
469module_i2c_driver(isl29003_driver);
470
471MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
472MODULE_DESCRIPTION("ISL29003 ambient light sensor driver");
473MODULE_LICENSE("GPL v2");
474MODULE_VERSION(DRIVER_VERSION);