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20#include <linux/kernel.h>
21#include <linux/slab.h>
22#include <linux/module.h>
23#include <linux/delay.h>
24#include <linux/i2c.h>
25#include <linux/mutex.h>
26#include <linux/acpi.h>
27#include <linux/regmap.h>
28#include <linux/iio/iio.h>
29#include <linux/iio/sysfs.h>
30
31
32#define JSA1212_CONF_REG 0x01
33#define JSA1212_INT_REG 0x02
34#define JSA1212_PXS_LT_REG 0x03
35#define JSA1212_PXS_HT_REG 0x04
36#define JSA1212_ALS_TH1_REG 0x05
37#define JSA1212_ALS_TH2_REG 0x06
38#define JSA1212_ALS_TH3_REG 0x07
39#define JSA1212_PXS_DATA_REG 0x08
40#define JSA1212_ALS_DT1_REG 0x09
41#define JSA1212_ALS_DT2_REG 0x0A
42#define JSA1212_ALS_RNG_REG 0x0B
43#define JSA1212_MAX_REG 0x0C
44
45
46#define JSA1212_CONF_MASK 0xFF
47#define JSA1212_INT_MASK 0xFF
48#define JSA1212_PXS_LT_MASK 0xFF
49#define JSA1212_PXS_HT_MASK 0xFF
50#define JSA1212_ALS_TH1_MASK 0xFF
51#define JSA1212_ALS_TH2_LT_MASK 0x0F
52#define JSA1212_ALS_TH2_HT_MASK 0xF0
53#define JSA1212_ALS_TH3_MASK 0xFF
54#define JSA1212_PXS_DATA_MASK 0xFF
55#define JSA1212_ALS_DATA_MASK 0x0FFF
56#define JSA1212_ALS_DT1_MASK 0xFF
57#define JSA1212_ALS_DT2_MASK 0x0F
58#define JSA1212_ALS_RNG_MASK 0x07
59
60
61#define JSA1212_CONF_PXS_MASK 0x80
62#define JSA1212_CONF_PXS_ENABLE 0x80
63#define JSA1212_CONF_PXS_DISABLE 0x00
64#define JSA1212_CONF_ALS_MASK 0x04
65#define JSA1212_CONF_ALS_ENABLE 0x04
66#define JSA1212_CONF_ALS_DISABLE 0x00
67#define JSA1212_CONF_IRDR_MASK 0x08
68
69#define JSA1212_CONF_IRDR_200MA 0x08
70#define JSA1212_CONF_IRDR_100MA 0x00
71#define JSA1212_CONF_PXS_SLP_MASK 0x70
72#define JSA1212_CONF_PXS_SLP_0MS 0x70
73#define JSA1212_CONF_PXS_SLP_12MS 0x60
74#define JSA1212_CONF_PXS_SLP_50MS 0x50
75#define JSA1212_CONF_PXS_SLP_75MS 0x40
76#define JSA1212_CONF_PXS_SLP_100MS 0x30
77#define JSA1212_CONF_PXS_SLP_200MS 0x20
78#define JSA1212_CONF_PXS_SLP_400MS 0x10
79#define JSA1212_CONF_PXS_SLP_800MS 0x00
80
81
82#define JSA1212_INT_CTRL_MASK 0x01
83#define JSA1212_INT_CTRL_EITHER 0x00
84#define JSA1212_INT_CTRL_BOTH 0x01
85#define JSA1212_INT_ALS_PRST_MASK 0x06
86#define JSA1212_INT_ALS_PRST_1CONV 0x00
87#define JSA1212_INT_ALS_PRST_4CONV 0x02
88#define JSA1212_INT_ALS_PRST_8CONV 0x04
89#define JSA1212_INT_ALS_PRST_16CONV 0x06
90#define JSA1212_INT_ALS_FLAG_MASK 0x08
91#define JSA1212_INT_ALS_FLAG_CLR 0x00
92#define JSA1212_INT_PXS_PRST_MASK 0x60
93#define JSA1212_INT_PXS_PRST_1CONV 0x00
94#define JSA1212_INT_PXS_PRST_4CONV 0x20
95#define JSA1212_INT_PXS_PRST_8CONV 0x40
96#define JSA1212_INT_PXS_PRST_16CONV 0x60
97#define JSA1212_INT_PXS_FLAG_MASK 0x80
98#define JSA1212_INT_PXS_FLAG_CLR 0x00
99
100
101#define JSA1212_ALS_RNG_0_2048 0x00
102#define JSA1212_ALS_RNG_0_1024 0x01
103#define JSA1212_ALS_RNG_0_512 0x02
104#define JSA1212_ALS_RNG_0_256 0x03
105#define JSA1212_ALS_RNG_0_128 0x04
106
107
108#define JSA1212_ALS_TH_MIN 0x0000
109#define JSA1212_ALS_TH_MAX 0x0FFF
110#define JSA1212_PXS_TH_MIN 0x00
111#define JSA1212_PXS_TH_MAX 0xFF
112
113#define JSA1212_ALS_DELAY_MS 200
114#define JSA1212_PXS_DELAY_MS 100
115
116#define JSA1212_DRIVER_NAME "jsa1212"
117#define JSA1212_REGMAP_NAME "jsa1212_regmap"
118
119enum jsa1212_op_mode {
120 JSA1212_OPMODE_ALS_EN,
121 JSA1212_OPMODE_PXS_EN,
122};
123
124struct jsa1212_data {
125 struct i2c_client *client;
126 struct mutex lock;
127 u8 als_rng_idx;
128 bool als_en;
129 bool pxs_en;
130 struct regmap *regmap;
131};
132
133
134static const int jsa1212_als_range_val[] = {2048, 1024, 512, 256, 128,
135 128, 128, 128};
136
137
138static int jsa1212_als_enable(struct jsa1212_data *data, u8 status)
139{
140 int ret;
141
142 ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
143 JSA1212_CONF_ALS_MASK,
144 status);
145 if (ret < 0)
146 return ret;
147
148 data->als_en = !!status;
149
150 return 0;
151}
152
153
154static int jsa1212_pxs_enable(struct jsa1212_data *data, u8 status)
155{
156 int ret;
157
158 ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
159 JSA1212_CONF_PXS_MASK,
160 status);
161 if (ret < 0)
162 return ret;
163
164 data->pxs_en = !!status;
165
166 return 0;
167}
168
169static int jsa1212_read_als_data(struct jsa1212_data *data,
170 unsigned int *val)
171{
172 int ret;
173 __le16 als_data;
174
175 ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
176 if (ret < 0)
177 return ret;
178
179
180 msleep(JSA1212_ALS_DELAY_MS);
181
182
183 ret = regmap_bulk_read(data->regmap, JSA1212_ALS_DT1_REG, &als_data, 2);
184 if (ret < 0) {
185 dev_err(&data->client->dev, "als data read err\n");
186 goto als_data_read_err;
187 }
188
189 *val = le16_to_cpu(als_data);
190
191als_data_read_err:
192 return jsa1212_als_enable(data, JSA1212_CONF_ALS_DISABLE);
193}
194
195static int jsa1212_read_pxs_data(struct jsa1212_data *data,
196 unsigned int *val)
197{
198 int ret;
199 unsigned int pxs_data;
200
201 ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
202 if (ret < 0)
203 return ret;
204
205
206 msleep(JSA1212_PXS_DELAY_MS);
207
208
209 ret = regmap_read(data->regmap, JSA1212_PXS_DATA_REG, &pxs_data);
210 if (ret < 0) {
211 dev_err(&data->client->dev, "pxs data read err\n");
212 goto pxs_data_read_err;
213 }
214
215 *val = pxs_data & JSA1212_PXS_DATA_MASK;
216
217pxs_data_read_err:
218 return jsa1212_pxs_enable(data, JSA1212_CONF_PXS_DISABLE);
219}
220
221static int jsa1212_read_raw(struct iio_dev *indio_dev,
222 struct iio_chan_spec const *chan,
223 int *val, int *val2, long mask)
224{
225 int ret;
226 struct jsa1212_data *data = iio_priv(indio_dev);
227
228 switch (mask) {
229 case IIO_CHAN_INFO_RAW:
230 mutex_lock(&data->lock);
231 switch (chan->type) {
232 case IIO_LIGHT:
233 ret = jsa1212_read_als_data(data, val);
234 break;
235 case IIO_PROXIMITY:
236 ret = jsa1212_read_pxs_data(data, val);
237 break;
238 default:
239 ret = -EINVAL;
240 break;
241 }
242 mutex_unlock(&data->lock);
243 return ret < 0 ? ret : IIO_VAL_INT;
244 case IIO_CHAN_INFO_SCALE:
245 switch (chan->type) {
246 case IIO_LIGHT:
247 *val = jsa1212_als_range_val[data->als_rng_idx];
248 *val2 = BIT(12);
249 return IIO_VAL_FRACTIONAL;
250 default:
251 break;
252 }
253 break;
254 default:
255 break;
256 }
257
258 return -EINVAL;
259}
260
261static const struct iio_chan_spec jsa1212_channels[] = {
262 {
263 .type = IIO_LIGHT,
264 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
265 BIT(IIO_CHAN_INFO_SCALE),
266 },
267 {
268 .type = IIO_PROXIMITY,
269 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
270 }
271};
272
273static const struct iio_info jsa1212_info = {
274 .driver_module = THIS_MODULE,
275 .read_raw = &jsa1212_read_raw,
276};
277
278static int jsa1212_chip_init(struct jsa1212_data *data)
279{
280 int ret;
281
282 ret = regmap_write(data->regmap, JSA1212_CONF_REG,
283 (JSA1212_CONF_PXS_SLP_50MS |
284 JSA1212_CONF_IRDR_200MA));
285 if (ret < 0)
286 return ret;
287
288 ret = regmap_write(data->regmap, JSA1212_INT_REG,
289 JSA1212_INT_ALS_PRST_4CONV);
290 if (ret < 0)
291 return ret;
292
293 data->als_rng_idx = JSA1212_ALS_RNG_0_2048;
294
295 return 0;
296}
297
298static bool jsa1212_is_volatile_reg(struct device *dev, unsigned int reg)
299{
300 switch (reg) {
301 case JSA1212_PXS_DATA_REG:
302 case JSA1212_ALS_DT1_REG:
303 case JSA1212_ALS_DT2_REG:
304 case JSA1212_INT_REG:
305 return true;
306 default:
307 return false;
308 }
309}
310
311static const struct regmap_config jsa1212_regmap_config = {
312 .name = JSA1212_REGMAP_NAME,
313 .reg_bits = 8,
314 .val_bits = 8,
315 .max_register = JSA1212_MAX_REG,
316 .cache_type = REGCACHE_RBTREE,
317 .volatile_reg = jsa1212_is_volatile_reg,
318};
319
320static int jsa1212_probe(struct i2c_client *client,
321 const struct i2c_device_id *id)
322{
323 struct jsa1212_data *data;
324 struct iio_dev *indio_dev;
325 struct regmap *regmap;
326 int ret;
327
328 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
329 return -EOPNOTSUPP;
330
331 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
332 if (!indio_dev)
333 return -ENOMEM;
334
335 regmap = devm_regmap_init_i2c(client, &jsa1212_regmap_config);
336 if (IS_ERR(regmap)) {
337 dev_err(&client->dev, "Regmap initialization failed.\n");
338 return PTR_ERR(regmap);
339 }
340
341 data = iio_priv(indio_dev);
342
343 i2c_set_clientdata(client, indio_dev);
344 data->client = client;
345 data->regmap = regmap;
346
347 mutex_init(&data->lock);
348
349 ret = jsa1212_chip_init(data);
350 if (ret < 0)
351 return ret;
352
353 indio_dev->dev.parent = &client->dev;
354 indio_dev->channels = jsa1212_channels;
355 indio_dev->num_channels = ARRAY_SIZE(jsa1212_channels);
356 indio_dev->name = JSA1212_DRIVER_NAME;
357 indio_dev->modes = INDIO_DIRECT_MODE;
358
359 indio_dev->info = &jsa1212_info;
360
361 ret = iio_device_register(indio_dev);
362 if (ret < 0)
363 dev_err(&client->dev, "%s: register device failed\n", __func__);
364
365 return ret;
366}
367
368
369static int jsa1212_power_off(struct jsa1212_data *data)
370{
371 int ret;
372
373 mutex_lock(&data->lock);
374
375 ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
376 JSA1212_CONF_ALS_MASK |
377 JSA1212_CONF_PXS_MASK,
378 JSA1212_CONF_ALS_DISABLE |
379 JSA1212_CONF_PXS_DISABLE);
380
381 if (ret < 0)
382 dev_err(&data->client->dev, "power off cmd failed\n");
383
384 mutex_unlock(&data->lock);
385
386 return ret;
387}
388
389static int jsa1212_remove(struct i2c_client *client)
390{
391 struct iio_dev *indio_dev = i2c_get_clientdata(client);
392 struct jsa1212_data *data = iio_priv(indio_dev);
393
394 iio_device_unregister(indio_dev);
395
396 return jsa1212_power_off(data);
397}
398
399#ifdef CONFIG_PM_SLEEP
400static int jsa1212_suspend(struct device *dev)
401{
402 struct jsa1212_data *data;
403
404 data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
405
406 return jsa1212_power_off(data);
407}
408
409static int jsa1212_resume(struct device *dev)
410{
411 int ret = 0;
412 struct jsa1212_data *data;
413
414 data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
415
416 mutex_lock(&data->lock);
417
418 if (data->als_en) {
419 ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
420 if (ret < 0) {
421 dev_err(dev, "als resume failed\n");
422 goto unlock_and_ret;
423 }
424 }
425
426 if (data->pxs_en) {
427 ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
428 if (ret < 0)
429 dev_err(dev, "pxs resume failed\n");
430 }
431
432unlock_and_ret:
433 mutex_unlock(&data->lock);
434 return ret;
435}
436
437static SIMPLE_DEV_PM_OPS(jsa1212_pm_ops, jsa1212_suspend, jsa1212_resume);
438
439#define JSA1212_PM_OPS (&jsa1212_pm_ops)
440#else
441#define JSA1212_PM_OPS NULL
442#endif
443
444static const struct acpi_device_id jsa1212_acpi_match[] = {
445 {"JSA1212", 0},
446 { },
447};
448MODULE_DEVICE_TABLE(acpi, jsa1212_acpi_match);
449
450static const struct i2c_device_id jsa1212_id[] = {
451 { JSA1212_DRIVER_NAME, 0 },
452 { }
453};
454MODULE_DEVICE_TABLE(i2c, jsa1212_id);
455
456static struct i2c_driver jsa1212_driver = {
457 .driver = {
458 .name = JSA1212_DRIVER_NAME,
459 .pm = JSA1212_PM_OPS,
460 .acpi_match_table = ACPI_PTR(jsa1212_acpi_match),
461 },
462 .probe = jsa1212_probe,
463 .remove = jsa1212_remove,
464 .id_table = jsa1212_id,
465};
466module_i2c_driver(jsa1212_driver);
467
468MODULE_AUTHOR("Sathya Kuppuswamy <sathyanarayanan.kuppuswamy@linux.intel.com>");
469MODULE_DESCRIPTION("JSA1212 proximity/ambient light sensor driver");
470MODULE_LICENSE("GPL v2");
471
