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94042874 RK |
1 | /* |
2 | * A iio driver for the light sensor ISL 29018. | |
3 | * | |
4 | * IIO driver for monitoring ambient light intensity in luxi, proximity | |
5 | * sensing and infrared sensing. | |
6 | * | |
7 | * Copyright (c) 2010, NVIDIA Corporation. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
15 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
16 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
17 | * more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
22 | */ | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/i2c.h> | |
26 | #include <linux/err.h> | |
27 | #include <linux/mutex.h> | |
28 | #include <linux/delay.h> | |
057340e3 | 29 | #include <linux/regmap.h> |
94042874 | 30 | #include <linux/slab.h> |
06458e27 JC |
31 | #include <linux/iio/iio.h> |
32 | #include <linux/iio/sysfs.h> | |
057340e3 | 33 | |
94042874 RK |
34 | #define CONVERSION_TIME_MS 100 |
35 | ||
36 | #define ISL29018_REG_ADD_COMMAND1 0x00 | |
37 | #define COMMMAND1_OPMODE_SHIFT 5 | |
38 | #define COMMMAND1_OPMODE_MASK (7 << COMMMAND1_OPMODE_SHIFT) | |
39 | #define COMMMAND1_OPMODE_POWER_DOWN 0 | |
40 | #define COMMMAND1_OPMODE_ALS_ONCE 1 | |
41 | #define COMMMAND1_OPMODE_IR_ONCE 2 | |
42 | #define COMMMAND1_OPMODE_PROX_ONCE 3 | |
43 | ||
44 | #define ISL29018_REG_ADD_COMMANDII 0x01 | |
45 | #define COMMANDII_RESOLUTION_SHIFT 2 | |
46 | #define COMMANDII_RESOLUTION_MASK (0x3 << COMMANDII_RESOLUTION_SHIFT) | |
47 | ||
48 | #define COMMANDII_RANGE_SHIFT 0 | |
49 | #define COMMANDII_RANGE_MASK (0x3 << COMMANDII_RANGE_SHIFT) | |
50 | ||
51 | #define COMMANDII_SCHEME_SHIFT 7 | |
52 | #define COMMANDII_SCHEME_MASK (0x1 << COMMANDII_SCHEME_SHIFT) | |
53 | ||
54 | #define ISL29018_REG_ADD_DATA_LSB 0x02 | |
55 | #define ISL29018_REG_ADD_DATA_MSB 0x03 | |
94042874 | 56 | |
176f9f29 GG |
57 | #define ISL29018_REG_TEST 0x08 |
58 | #define ISL29018_TEST_SHIFT 0 | |
59 | #define ISL29018_TEST_MASK (0xFF << ISL29018_TEST_SHIFT) | |
60 | ||
94042874 | 61 | struct isl29018_chip { |
057340e3 LD |
62 | struct device *dev; |
63 | struct regmap *regmap; | |
94042874 | 64 | struct mutex lock; |
6d1ad0f8 | 65 | unsigned int lux_scale; |
94042874 RK |
66 | unsigned int range; |
67 | unsigned int adc_bit; | |
68 | int prox_scheme; | |
94042874 RK |
69 | }; |
70 | ||
057340e3 | 71 | static int isl29018_set_range(struct isl29018_chip *chip, unsigned long range, |
94042874 RK |
72 | unsigned int *new_range) |
73 | { | |
74 | static const unsigned long supp_ranges[] = {1000, 4000, 16000, 64000}; | |
75 | int i; | |
76 | ||
77 | for (i = 0; i < ARRAY_SIZE(supp_ranges); ++i) { | |
78 | if (range <= supp_ranges[i]) { | |
79 | *new_range = (unsigned int)supp_ranges[i]; | |
80 | break; | |
81 | } | |
82 | } | |
83 | ||
84 | if (i >= ARRAY_SIZE(supp_ranges)) | |
85 | return -EINVAL; | |
86 | ||
057340e3 LD |
87 | return regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII, |
88 | COMMANDII_RANGE_MASK, i << COMMANDII_RANGE_SHIFT); | |
94042874 RK |
89 | } |
90 | ||
057340e3 | 91 | static int isl29018_set_resolution(struct isl29018_chip *chip, |
94042874 RK |
92 | unsigned long adcbit, unsigned int *conf_adc_bit) |
93 | { | |
94 | static const unsigned long supp_adcbit[] = {16, 12, 8, 4}; | |
95 | int i; | |
96 | ||
97 | for (i = 0; i < ARRAY_SIZE(supp_adcbit); ++i) { | |
98 | if (adcbit >= supp_adcbit[i]) { | |
99 | *conf_adc_bit = (unsigned int)supp_adcbit[i]; | |
100 | break; | |
101 | } | |
102 | } | |
103 | ||
104 | if (i >= ARRAY_SIZE(supp_adcbit)) | |
105 | return -EINVAL; | |
106 | ||
057340e3 LD |
107 | return regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII, |
108 | COMMANDII_RESOLUTION_MASK, | |
109 | i << COMMANDII_RESOLUTION_SHIFT); | |
94042874 RK |
110 | } |
111 | ||
057340e3 | 112 | static int isl29018_read_sensor_input(struct isl29018_chip *chip, int mode) |
94042874 RK |
113 | { |
114 | int status; | |
057340e3 LD |
115 | unsigned int lsb; |
116 | unsigned int msb; | |
94042874 RK |
117 | |
118 | /* Set mode */ | |
057340e3 LD |
119 | status = regmap_write(chip->regmap, ISL29018_REG_ADD_COMMAND1, |
120 | mode << COMMMAND1_OPMODE_SHIFT); | |
94042874 | 121 | if (status) { |
057340e3 LD |
122 | dev_err(chip->dev, |
123 | "Error in setting operating mode err %d\n", status); | |
94042874 RK |
124 | return status; |
125 | } | |
126 | msleep(CONVERSION_TIME_MS); | |
057340e3 LD |
127 | status = regmap_read(chip->regmap, ISL29018_REG_ADD_DATA_LSB, &lsb); |
128 | if (status < 0) { | |
129 | dev_err(chip->dev, | |
130 | "Error in reading LSB DATA with err %d\n", status); | |
131 | return status; | |
94042874 RK |
132 | } |
133 | ||
057340e3 LD |
134 | status = regmap_read(chip->regmap, ISL29018_REG_ADD_DATA_MSB, &msb); |
135 | if (status < 0) { | |
136 | dev_err(chip->dev, | |
137 | "Error in reading MSB DATA with error %d\n", status); | |
138 | return status; | |
94042874 | 139 | } |
057340e3 | 140 | dev_vdbg(chip->dev, "MSB 0x%x and LSB 0x%x\n", msb, lsb); |
94042874 RK |
141 | |
142 | return (msb << 8) | lsb; | |
143 | } | |
144 | ||
057340e3 | 145 | static int isl29018_read_lux(struct isl29018_chip *chip, int *lux) |
94042874 RK |
146 | { |
147 | int lux_data; | |
94042874 | 148 | |
057340e3 | 149 | lux_data = isl29018_read_sensor_input(chip, COMMMAND1_OPMODE_ALS_ONCE); |
94042874 RK |
150 | |
151 | if (lux_data < 0) | |
152 | return lux_data; | |
153 | ||
6d1ad0f8 | 154 | *lux = (lux_data * chip->range * chip->lux_scale) >> chip->adc_bit; |
94042874 RK |
155 | |
156 | return 0; | |
157 | } | |
158 | ||
057340e3 | 159 | static int isl29018_read_ir(struct isl29018_chip *chip, int *ir) |
94042874 RK |
160 | { |
161 | int ir_data; | |
162 | ||
057340e3 | 163 | ir_data = isl29018_read_sensor_input(chip, COMMMAND1_OPMODE_IR_ONCE); |
94042874 RK |
164 | |
165 | if (ir_data < 0) | |
166 | return ir_data; | |
167 | ||
168 | *ir = ir_data; | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
057340e3 | 173 | static int isl29018_read_proximity_ir(struct isl29018_chip *chip, int scheme, |
94042874 RK |
174 | int *near_ir) |
175 | { | |
176 | int status; | |
177 | int prox_data = -1; | |
178 | int ir_data = -1; | |
179 | ||
180 | /* Do proximity sensing with required scheme */ | |
057340e3 LD |
181 | status = regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII, |
182 | COMMANDII_SCHEME_MASK, | |
183 | scheme << COMMANDII_SCHEME_SHIFT); | |
94042874 | 184 | if (status) { |
057340e3 | 185 | dev_err(chip->dev, "Error in setting operating mode\n"); |
94042874 RK |
186 | return status; |
187 | } | |
188 | ||
057340e3 | 189 | prox_data = isl29018_read_sensor_input(chip, |
94042874 RK |
190 | COMMMAND1_OPMODE_PROX_ONCE); |
191 | if (prox_data < 0) | |
192 | return prox_data; | |
193 | ||
194 | if (scheme == 1) { | |
195 | *near_ir = prox_data; | |
196 | return 0; | |
197 | } | |
198 | ||
057340e3 | 199 | ir_data = isl29018_read_sensor_input(chip, COMMMAND1_OPMODE_IR_ONCE); |
94042874 RK |
200 | |
201 | if (ir_data < 0) | |
202 | return ir_data; | |
203 | ||
204 | if (prox_data >= ir_data) | |
205 | *near_ir = prox_data - ir_data; | |
206 | else | |
207 | *near_ir = 0; | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
94042874 RK |
212 | /* Sysfs interface */ |
213 | /* range */ | |
214 | static ssize_t show_range(struct device *dev, | |
215 | struct device_attribute *attr, char *buf) | |
216 | { | |
217 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
927afbec | 218 | struct isl29018_chip *chip = iio_priv(indio_dev); |
94042874 RK |
219 | |
220 | return sprintf(buf, "%u\n", chip->range); | |
221 | } | |
222 | ||
223 | static ssize_t store_range(struct device *dev, | |
224 | struct device_attribute *attr, const char *buf, size_t count) | |
225 | { | |
226 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
927afbec | 227 | struct isl29018_chip *chip = iio_priv(indio_dev); |
94042874 RK |
228 | int status; |
229 | unsigned long lval; | |
230 | unsigned int new_range; | |
231 | ||
232 | if (strict_strtoul(buf, 10, &lval)) | |
233 | return -EINVAL; | |
234 | ||
235 | if (!(lval == 1000UL || lval == 4000UL || | |
236 | lval == 16000UL || lval == 64000UL)) { | |
237 | dev_err(dev, "The range is not supported\n"); | |
238 | return -EINVAL; | |
239 | } | |
240 | ||
241 | mutex_lock(&chip->lock); | |
057340e3 | 242 | status = isl29018_set_range(chip, lval, &new_range); |
94042874 RK |
243 | if (status < 0) { |
244 | mutex_unlock(&chip->lock); | |
057340e3 LD |
245 | dev_err(dev, |
246 | "Error in setting max range with err %d\n", status); | |
94042874 RK |
247 | return status; |
248 | } | |
249 | chip->range = new_range; | |
250 | mutex_unlock(&chip->lock); | |
251 | ||
252 | return count; | |
253 | } | |
254 | ||
255 | /* resolution */ | |
256 | static ssize_t show_resolution(struct device *dev, | |
257 | struct device_attribute *attr, char *buf) | |
258 | { | |
259 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
927afbec | 260 | struct isl29018_chip *chip = iio_priv(indio_dev); |
94042874 RK |
261 | |
262 | return sprintf(buf, "%u\n", chip->adc_bit); | |
263 | } | |
264 | ||
265 | static ssize_t store_resolution(struct device *dev, | |
266 | struct device_attribute *attr, const char *buf, size_t count) | |
267 | { | |
268 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
927afbec | 269 | struct isl29018_chip *chip = iio_priv(indio_dev); |
94042874 RK |
270 | int status; |
271 | unsigned long lval; | |
272 | unsigned int new_adc_bit; | |
273 | ||
274 | if (strict_strtoul(buf, 10, &lval)) | |
275 | return -EINVAL; | |
276 | if (!(lval == 4 || lval == 8 || lval == 12 || lval == 16)) { | |
277 | dev_err(dev, "The resolution is not supported\n"); | |
278 | return -EINVAL; | |
279 | } | |
280 | ||
281 | mutex_lock(&chip->lock); | |
057340e3 | 282 | status = isl29018_set_resolution(chip, lval, &new_adc_bit); |
94042874 RK |
283 | if (status < 0) { |
284 | mutex_unlock(&chip->lock); | |
285 | dev_err(dev, "Error in setting resolution\n"); | |
286 | return status; | |
287 | } | |
288 | chip->adc_bit = new_adc_bit; | |
289 | mutex_unlock(&chip->lock); | |
290 | ||
291 | return count; | |
292 | } | |
293 | ||
294 | /* proximity scheme */ | |
295 | static ssize_t show_prox_infrared_supression(struct device *dev, | |
296 | struct device_attribute *attr, char *buf) | |
297 | { | |
298 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
927afbec | 299 | struct isl29018_chip *chip = iio_priv(indio_dev); |
94042874 RK |
300 | |
301 | /* return the "proximity scheme" i.e. if the chip does on chip | |
302 | infrared supression (1 means perform on chip supression) */ | |
303 | return sprintf(buf, "%d\n", chip->prox_scheme); | |
304 | } | |
305 | ||
306 | static ssize_t store_prox_infrared_supression(struct device *dev, | |
307 | struct device_attribute *attr, const char *buf, size_t count) | |
308 | { | |
309 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
927afbec | 310 | struct isl29018_chip *chip = iio_priv(indio_dev); |
94042874 RK |
311 | unsigned long lval; |
312 | ||
313 | if (strict_strtoul(buf, 10, &lval)) | |
314 | return -EINVAL; | |
315 | if (!(lval == 0UL || lval == 1UL)) { | |
316 | dev_err(dev, "The mode is not supported\n"); | |
317 | return -EINVAL; | |
318 | } | |
319 | ||
320 | /* get the "proximity scheme" i.e. if the chip does on chip | |
321 | infrared supression (1 means perform on chip supression) */ | |
322 | mutex_lock(&chip->lock); | |
323 | chip->prox_scheme = (int)lval; | |
324 | mutex_unlock(&chip->lock); | |
325 | ||
326 | return count; | |
327 | } | |
328 | ||
01e57c57 BF |
329 | /* Channel IO */ |
330 | static int isl29018_write_raw(struct iio_dev *indio_dev, | |
331 | struct iio_chan_spec const *chan, | |
332 | int val, | |
333 | int val2, | |
334 | long mask) | |
94042874 | 335 | { |
01e57c57 BF |
336 | struct isl29018_chip *chip = iio_priv(indio_dev); |
337 | int ret = -EINVAL; | |
94042874 | 338 | |
01e57c57 | 339 | mutex_lock(&chip->lock); |
c8a9f805 | 340 | if (mask == IIO_CHAN_INFO_CALIBSCALE && chan->type == IIO_LIGHT) { |
01e57c57 BF |
341 | chip->lux_scale = val; |
342 | ret = 0; | |
343 | } | |
344 | mutex_unlock(&chip->lock); | |
345 | ||
346 | return 0; | |
94042874 RK |
347 | } |
348 | ||
01e57c57 BF |
349 | static int isl29018_read_raw(struct iio_dev *indio_dev, |
350 | struct iio_chan_spec const *chan, | |
351 | int *val, | |
352 | int *val2, | |
353 | long mask) | |
94042874 | 354 | { |
01e57c57 BF |
355 | int ret = -EINVAL; |
356 | struct isl29018_chip *chip = iio_priv(indio_dev); | |
01e57c57 BF |
357 | |
358 | mutex_lock(&chip->lock); | |
359 | switch (mask) { | |
90354d00 JC |
360 | case IIO_CHAN_INFO_RAW: |
361 | case IIO_CHAN_INFO_PROCESSED: | |
01e57c57 BF |
362 | switch (chan->type) { |
363 | case IIO_LIGHT: | |
057340e3 | 364 | ret = isl29018_read_lux(chip, val); |
01e57c57 BF |
365 | break; |
366 | case IIO_INTENSITY: | |
057340e3 | 367 | ret = isl29018_read_ir(chip, val); |
01e57c57 BF |
368 | break; |
369 | case IIO_PROXIMITY: | |
057340e3 | 370 | ret = isl29018_read_proximity_ir(chip, |
01e57c57 BF |
371 | chip->prox_scheme, val); |
372 | break; | |
373 | default: | |
374 | break; | |
375 | } | |
376 | if (!ret) | |
377 | ret = IIO_VAL_INT; | |
378 | break; | |
c8a9f805 | 379 | case IIO_CHAN_INFO_CALIBSCALE: |
01e57c57 BF |
380 | if (chan->type == IIO_LIGHT) { |
381 | *val = chip->lux_scale; | |
382 | ret = IIO_VAL_INT; | |
383 | } | |
384 | break; | |
385 | default: | |
386 | break; | |
387 | } | |
388 | mutex_unlock(&chip->lock); | |
389 | return ret; | |
94042874 RK |
390 | } |
391 | ||
01e57c57 BF |
392 | static const struct iio_chan_spec isl29018_channels[] = { |
393 | { | |
394 | .type = IIO_LIGHT, | |
395 | .indexed = 1, | |
396 | .channel = 0, | |
90354d00 JC |
397 | .info_mask = IIO_CHAN_INFO_PROCESSED_SEPARATE_BIT | |
398 | IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT, | |
01e57c57 BF |
399 | }, { |
400 | .type = IIO_INTENSITY, | |
401 | .modified = 1, | |
90354d00 | 402 | .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT, |
01e57c57 BF |
403 | .channel2 = IIO_MOD_LIGHT_IR, |
404 | }, { | |
405 | /* Unindexed in current ABI. But perhaps it should be. */ | |
406 | .type = IIO_PROXIMITY, | |
90354d00 | 407 | .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT, |
01e57c57 BF |
408 | } |
409 | }; | |
410 | ||
94042874 RK |
411 | static IIO_DEVICE_ATTR(range, S_IRUGO | S_IWUSR, show_range, store_range, 0); |
412 | static IIO_CONST_ATTR(range_available, "1000 4000 16000 64000"); | |
413 | static IIO_CONST_ATTR(adc_resolution_available, "4 8 12 16"); | |
414 | static IIO_DEVICE_ATTR(adc_resolution, S_IRUGO | S_IWUSR, | |
415 | show_resolution, store_resolution, 0); | |
416 | static IIO_DEVICE_ATTR(proximity_on_chip_ambient_infrared_supression, | |
417 | S_IRUGO | S_IWUSR, | |
418 | show_prox_infrared_supression, | |
419 | store_prox_infrared_supression, 0); | |
94042874 RK |
420 | |
421 | #define ISL29018_DEV_ATTR(name) (&iio_dev_attr_##name.dev_attr.attr) | |
422 | #define ISL29018_CONST_ATTR(name) (&iio_const_attr_##name.dev_attr.attr) | |
423 | static struct attribute *isl29018_attributes[] = { | |
94042874 RK |
424 | ISL29018_DEV_ATTR(range), |
425 | ISL29018_CONST_ATTR(range_available), | |
426 | ISL29018_DEV_ATTR(adc_resolution), | |
427 | ISL29018_CONST_ATTR(adc_resolution_available), | |
428 | ISL29018_DEV_ATTR(proximity_on_chip_ambient_infrared_supression), | |
94042874 RK |
429 | NULL |
430 | }; | |
431 | ||
432 | static const struct attribute_group isl29108_group = { | |
433 | .attrs = isl29018_attributes, | |
434 | }; | |
435 | ||
057340e3 | 436 | static int isl29018_chip_init(struct isl29018_chip *chip) |
94042874 | 437 | { |
94042874 RK |
438 | int status; |
439 | int new_adc_bit; | |
440 | unsigned int new_range; | |
441 | ||
176f9f29 GG |
442 | /* Code added per Intersil Application Note 1534: |
443 | * When VDD sinks to approximately 1.8V or below, some of | |
444 | * the part's registers may change their state. When VDD | |
445 | * recovers to 2.25V (or greater), the part may thus be in an | |
446 | * unknown mode of operation. The user can return the part to | |
447 | * a known mode of operation either by (a) setting VDD = 0V for | |
448 | * 1 second or more and then powering back up with a slew rate | |
449 | * of 0.5V/ms or greater, or (b) via I2C disable all ALS/PROX | |
450 | * conversions, clear the test registers, and then rewrite all | |
451 | * registers to the desired values. | |
452 | * ... | |
453 | * FOR ISL29011, ISL29018, ISL29021, ISL29023 | |
454 | * 1. Write 0x00 to register 0x08 (TEST) | |
455 | * 2. Write 0x00 to register 0x00 (CMD1) | |
456 | * 3. Rewrite all registers to the desired values | |
457 | * | |
458 | * ISL29018 Data Sheet (FN6619.1, Feb 11, 2010) essentially says | |
459 | * the same thing EXCEPT the data sheet asks for a 1ms delay after | |
460 | * writing the CMD1 register. | |
461 | */ | |
057340e3 | 462 | status = regmap_write(chip->regmap, ISL29018_REG_TEST, 0x0); |
176f9f29 | 463 | if (status < 0) { |
057340e3 | 464 | dev_err(chip->dev, "Failed to clear isl29018 TEST reg." |
176f9f29 GG |
465 | "(%d)\n", status); |
466 | return status; | |
467 | } | |
468 | ||
469 | /* See Intersil AN1534 comments above. | |
470 | * "Operating Mode" (COMMAND1) register is reprogrammed when | |
471 | * data is read from the device. | |
472 | */ | |
057340e3 | 473 | status = regmap_write(chip->regmap, ISL29018_REG_ADD_COMMAND1, 0); |
176f9f29 | 474 | if (status < 0) { |
057340e3 | 475 | dev_err(chip->dev, "Failed to clear isl29018 CMD1 reg." |
176f9f29 GG |
476 | "(%d)\n", status); |
477 | return status; | |
478 | } | |
479 | ||
480 | msleep(1); /* per data sheet, page 10 */ | |
481 | ||
94042874 | 482 | /* set defaults */ |
057340e3 | 483 | status = isl29018_set_range(chip, chip->range, &new_range); |
94042874 | 484 | if (status < 0) { |
057340e3 | 485 | dev_err(chip->dev, "Init of isl29018 fails\n"); |
94042874 RK |
486 | return status; |
487 | } | |
488 | ||
057340e3 | 489 | status = isl29018_set_resolution(chip, chip->adc_bit, |
94042874 RK |
490 | &new_adc_bit); |
491 | ||
492 | return 0; | |
493 | } | |
494 | ||
6fe8135f JC |
495 | static const struct iio_info isl29108_info = { |
496 | .attrs = &isl29108_group, | |
497 | .driver_module = THIS_MODULE, | |
01e57c57 BF |
498 | .read_raw = &isl29018_read_raw, |
499 | .write_raw = &isl29018_write_raw, | |
6fe8135f JC |
500 | }; |
501 | ||
057340e3 LD |
502 | static bool is_volatile_reg(struct device *dev, unsigned int reg) |
503 | { | |
504 | switch (reg) { | |
505 | case ISL29018_REG_ADD_DATA_LSB: | |
506 | case ISL29018_REG_ADD_DATA_MSB: | |
507 | case ISL29018_REG_ADD_COMMAND1: | |
508 | case ISL29018_REG_TEST: | |
509 | return true; | |
510 | default: | |
511 | return false; | |
512 | } | |
513 | } | |
514 | ||
515 | /* | |
516 | * isl29018_regmap_config: regmap configuration. | |
517 | * Use RBTREE mechanism for caching. | |
518 | */ | |
519 | static const struct regmap_config isl29018_regmap_config = { | |
520 | .reg_bits = 8, | |
521 | .val_bits = 8, | |
522 | .volatile_reg = is_volatile_reg, | |
523 | .max_register = ISL29018_REG_TEST, | |
524 | .num_reg_defaults_raw = ISL29018_REG_TEST + 1, | |
525 | .cache_type = REGCACHE_RBTREE, | |
526 | }; | |
527 | ||
94042874 RK |
528 | static int __devinit isl29018_probe(struct i2c_client *client, |
529 | const struct i2c_device_id *id) | |
530 | { | |
531 | struct isl29018_chip *chip; | |
927afbec | 532 | struct iio_dev *indio_dev; |
94042874 RK |
533 | int err; |
534 | ||
7cbb7537 | 535 | indio_dev = iio_device_alloc(sizeof(*chip)); |
927afbec JC |
536 | if (indio_dev == NULL) { |
537 | dev_err(&client->dev, "iio allocation fails\n"); | |
94042874 RK |
538 | err = -ENOMEM; |
539 | goto exit; | |
540 | } | |
927afbec | 541 | chip = iio_priv(indio_dev); |
94042874 | 542 | |
927afbec | 543 | i2c_set_clientdata(client, indio_dev); |
057340e3 | 544 | chip->dev = &client->dev; |
94042874 RK |
545 | |
546 | mutex_init(&chip->lock); | |
547 | ||
6d1ad0f8 | 548 | chip->lux_scale = 1; |
94042874 RK |
549 | chip->range = 1000; |
550 | chip->adc_bit = 16; | |
551 | ||
057340e3 LD |
552 | chip->regmap = devm_regmap_init_i2c(client, &isl29018_regmap_config); |
553 | if (IS_ERR(chip->regmap)) { | |
554 | err = PTR_ERR(chip->regmap); | |
555 | dev_err(chip->dev, "regmap initialization failed: %d\n", err); | |
556 | goto exit; | |
557 | } | |
558 | ||
559 | err = isl29018_chip_init(chip); | |
94042874 | 560 | if (err) |
927afbec | 561 | goto exit_iio_free; |
94042874 | 562 | |
927afbec | 563 | indio_dev->info = &isl29108_info; |
01e57c57 BF |
564 | indio_dev->channels = isl29018_channels; |
565 | indio_dev->num_channels = ARRAY_SIZE(isl29018_channels); | |
927afbec JC |
566 | indio_dev->name = id->name; |
567 | indio_dev->dev.parent = &client->dev; | |
568 | indio_dev->modes = INDIO_DIRECT_MODE; | |
569 | err = iio_device_register(indio_dev); | |
94042874 RK |
570 | if (err) { |
571 | dev_err(&client->dev, "iio registration fails\n"); | |
572 | goto exit_iio_free; | |
573 | } | |
574 | ||
575 | return 0; | |
576 | exit_iio_free: | |
7cbb7537 | 577 | iio_device_free(indio_dev); |
94042874 RK |
578 | exit: |
579 | return err; | |
580 | } | |
581 | ||
582 | static int __devexit isl29018_remove(struct i2c_client *client) | |
583 | { | |
927afbec | 584 | struct iio_dev *indio_dev = i2c_get_clientdata(client); |
94042874 RK |
585 | |
586 | dev_dbg(&client->dev, "%s()\n", __func__); | |
927afbec | 587 | iio_device_unregister(indio_dev); |
7cbb7537 | 588 | iio_device_free(indio_dev); |
94042874 RK |
589 | |
590 | return 0; | |
591 | } | |
592 | ||
593 | static const struct i2c_device_id isl29018_id[] = { | |
594 | {"isl29018", 0}, | |
595 | {} | |
596 | }; | |
597 | ||
598 | MODULE_DEVICE_TABLE(i2c, isl29018_id); | |
599 | ||
4ee19524 | 600 | static const struct of_device_id isl29018_of_match[] = { |
610202dd | 601 | { .compatible = "isil,isl29018", }, |
4ee19524 OJ |
602 | { }, |
603 | }; | |
604 | MODULE_DEVICE_TABLE(of, isl29018_of_match); | |
605 | ||
94042874 RK |
606 | static struct i2c_driver isl29018_driver = { |
607 | .class = I2C_CLASS_HWMON, | |
608 | .driver = { | |
609 | .name = "isl29018", | |
610 | .owner = THIS_MODULE, | |
4ee19524 | 611 | .of_match_table = isl29018_of_match, |
94042874 RK |
612 | }, |
613 | .probe = isl29018_probe, | |
614 | .remove = __devexit_p(isl29018_remove), | |
615 | .id_table = isl29018_id, | |
616 | }; | |
6e5af184 | 617 | module_i2c_driver(isl29018_driver); |
94042874 RK |
618 | |
619 | MODULE_DESCRIPTION("ISL29018 Ambient Light Sensor driver"); | |
620 | MODULE_LICENSE("GPL"); |