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20#include <linux/delay.h>
21#include <linux/module.h>
22#include <linux/i2c.h>
23#include <linux/slab.h>
24#include <linux/of.h>
25#include <linux/gpio/consumer.h>
26#include <media/i2c/adp1653.h>
27#include <media/v4l2-device.h>
28
29#define TIMEOUT_MAX 820000
30#define TIMEOUT_STEP 54600
31#define TIMEOUT_MIN (TIMEOUT_MAX - ADP1653_REG_CONFIG_TMR_SET_MAX \
32 * TIMEOUT_STEP)
33#define TIMEOUT_US_TO_CODE(t) ((TIMEOUT_MAX + (TIMEOUT_STEP / 2) - (t)) \
34 / TIMEOUT_STEP)
35#define TIMEOUT_CODE_TO_US(c) (TIMEOUT_MAX - (c) * TIMEOUT_STEP)
36
37
38static int adp1653_update_hw(struct adp1653_flash *flash)
39{
40 struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
41 u8 out_sel;
42 u8 config = 0;
43 int rval;
44
45 out_sel = ADP1653_INDICATOR_INTENSITY_uA_TO_REG(
46 flash->indicator_intensity->val)
47 << ADP1653_REG_OUT_SEL_ILED_SHIFT;
48
49 switch (flash->led_mode->val) {
50 case V4L2_FLASH_LED_MODE_NONE:
51 break;
52 case V4L2_FLASH_LED_MODE_FLASH:
53
54 config = ADP1653_REG_CONFIG_TMR_CFG;
55 config |= TIMEOUT_US_TO_CODE(flash->flash_timeout->val)
56 << ADP1653_REG_CONFIG_TMR_SET_SHIFT;
57 break;
58 case V4L2_FLASH_LED_MODE_TORCH:
59
60 out_sel |= ADP1653_FLASH_INTENSITY_mA_TO_REG(
61 flash->torch_intensity->val)
62 << ADP1653_REG_OUT_SEL_HPLED_SHIFT;
63 break;
64 }
65
66 rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, out_sel);
67 if (rval < 0)
68 return rval;
69
70 rval = i2c_smbus_write_byte_data(client, ADP1653_REG_CONFIG, config);
71 if (rval < 0)
72 return rval;
73
74 return 0;
75}
76
77static int adp1653_get_fault(struct adp1653_flash *flash)
78{
79 struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
80 int fault;
81 int rval;
82
83 fault = i2c_smbus_read_byte_data(client, ADP1653_REG_FAULT);
84 if (fault < 0)
85 return fault;
86
87 flash->fault |= fault;
88
89 if (!flash->fault)
90 return 0;
91
92
93 rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, 0);
94 if (rval < 0)
95 return rval;
96
97 flash->led_mode->val = V4L2_FLASH_LED_MODE_NONE;
98
99 rval = adp1653_update_hw(flash);
100 if (rval)
101 return rval;
102
103 return flash->fault;
104}
105
106static int adp1653_strobe(struct adp1653_flash *flash, int enable)
107{
108 struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
109 u8 out_sel = ADP1653_INDICATOR_INTENSITY_uA_TO_REG(
110 flash->indicator_intensity->val)
111 << ADP1653_REG_OUT_SEL_ILED_SHIFT;
112 int rval;
113
114 if (flash->led_mode->val != V4L2_FLASH_LED_MODE_FLASH)
115 return -EBUSY;
116
117 if (!enable)
118 return i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL,
119 out_sel);
120
121 out_sel |= ADP1653_FLASH_INTENSITY_mA_TO_REG(
122 flash->flash_intensity->val)
123 << ADP1653_REG_OUT_SEL_HPLED_SHIFT;
124 rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, out_sel);
125 if (rval)
126 return rval;
127
128
129 rval = i2c_smbus_write_byte_data(client, ADP1653_REG_SW_STROBE,
130 ADP1653_REG_SW_STROBE_SW_STROBE);
131 if (rval)
132 return rval;
133 return i2c_smbus_write_byte_data(client, ADP1653_REG_SW_STROBE, 0);
134}
135
136
137
138
139
140static int adp1653_get_ctrl(struct v4l2_ctrl *ctrl)
141{
142 struct adp1653_flash *flash =
143 container_of(ctrl->handler, struct adp1653_flash, ctrls);
144 int rval;
145
146 rval = adp1653_get_fault(flash);
147 if (rval)
148 return rval;
149
150 ctrl->cur.val = 0;
151
152 if (flash->fault & ADP1653_REG_FAULT_FLT_SCP)
153 ctrl->cur.val |= V4L2_FLASH_FAULT_SHORT_CIRCUIT;
154 if (flash->fault & ADP1653_REG_FAULT_FLT_OT)
155 ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_TEMPERATURE;
156 if (flash->fault & ADP1653_REG_FAULT_FLT_TMR)
157 ctrl->cur.val |= V4L2_FLASH_FAULT_TIMEOUT;
158 if (flash->fault & ADP1653_REG_FAULT_FLT_OV)
159 ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_VOLTAGE;
160
161 flash->fault = 0;
162
163 return 0;
164}
165
166static int adp1653_set_ctrl(struct v4l2_ctrl *ctrl)
167{
168 struct adp1653_flash *flash =
169 container_of(ctrl->handler, struct adp1653_flash, ctrls);
170 int rval;
171
172 rval = adp1653_get_fault(flash);
173 if (rval)
174 return rval;
175 if ((rval & (ADP1653_REG_FAULT_FLT_SCP |
176 ADP1653_REG_FAULT_FLT_OT |
177 ADP1653_REG_FAULT_FLT_OV)) &&
178 (ctrl->id == V4L2_CID_FLASH_STROBE ||
179 ctrl->id == V4L2_CID_FLASH_TORCH_INTENSITY ||
180 ctrl->id == V4L2_CID_FLASH_LED_MODE))
181 return -EBUSY;
182
183 switch (ctrl->id) {
184 case V4L2_CID_FLASH_STROBE:
185 return adp1653_strobe(flash, 1);
186 case V4L2_CID_FLASH_STROBE_STOP:
187 return adp1653_strobe(flash, 0);
188 }
189
190 return adp1653_update_hw(flash);
191}
192
193static const struct v4l2_ctrl_ops adp1653_ctrl_ops = {
194 .g_volatile_ctrl = adp1653_get_ctrl,
195 .s_ctrl = adp1653_set_ctrl,
196};
197
198static int adp1653_init_controls(struct adp1653_flash *flash)
199{
200 struct v4l2_ctrl *fault;
201
202 v4l2_ctrl_handler_init(&flash->ctrls, 9);
203
204 flash->led_mode =
205 v4l2_ctrl_new_std_menu(&flash->ctrls, &adp1653_ctrl_ops,
206 V4L2_CID_FLASH_LED_MODE,
207 V4L2_FLASH_LED_MODE_TORCH, ~0x7, 0);
208 v4l2_ctrl_new_std_menu(&flash->ctrls, &adp1653_ctrl_ops,
209 V4L2_CID_FLASH_STROBE_SOURCE,
210 V4L2_FLASH_STROBE_SOURCE_SOFTWARE, ~0x1, 0);
211 v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
212 V4L2_CID_FLASH_STROBE, 0, 0, 0, 0);
213 v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
214 V4L2_CID_FLASH_STROBE_STOP, 0, 0, 0, 0);
215 flash->flash_timeout =
216 v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
217 V4L2_CID_FLASH_TIMEOUT, TIMEOUT_MIN,
218 flash->platform_data->max_flash_timeout,
219 TIMEOUT_STEP,
220 flash->platform_data->max_flash_timeout);
221 flash->flash_intensity =
222 v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
223 V4L2_CID_FLASH_INTENSITY,
224 ADP1653_FLASH_INTENSITY_MIN,
225 flash->platform_data->max_flash_intensity,
226 1, flash->platform_data->max_flash_intensity);
227 flash->torch_intensity =
228 v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
229 V4L2_CID_FLASH_TORCH_INTENSITY,
230 ADP1653_TORCH_INTENSITY_MIN,
231 flash->platform_data->max_torch_intensity,
232 ADP1653_FLASH_INTENSITY_STEP,
233 flash->platform_data->max_torch_intensity);
234 flash->indicator_intensity =
235 v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
236 V4L2_CID_FLASH_INDICATOR_INTENSITY,
237 ADP1653_INDICATOR_INTENSITY_MIN,
238 flash->platform_data->max_indicator_intensity,
239 ADP1653_INDICATOR_INTENSITY_STEP,
240 ADP1653_INDICATOR_INTENSITY_MIN);
241 fault = v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
242 V4L2_CID_FLASH_FAULT, 0,
243 V4L2_FLASH_FAULT_OVER_VOLTAGE
244 | V4L2_FLASH_FAULT_OVER_TEMPERATURE
245 | V4L2_FLASH_FAULT_SHORT_CIRCUIT, 0, 0);
246
247 if (flash->ctrls.error)
248 return flash->ctrls.error;
249
250 fault->flags |= V4L2_CTRL_FLAG_VOLATILE;
251
252 flash->subdev.ctrl_handler = &flash->ctrls;
253 return 0;
254}
255
256
257
258
259
260static int
261adp1653_init_device(struct adp1653_flash *flash)
262{
263 struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
264 int rval;
265
266
267 rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, 0);
268 if (rval < 0) {
269 dev_err(&client->dev, "failed writing fault register\n");
270 return -EIO;
271 }
272
273 mutex_lock(flash->ctrls.lock);
274
275 flash->fault = 0;
276 rval = adp1653_get_fault(flash);
277 mutex_unlock(flash->ctrls.lock);
278 if (rval > 0) {
279 dev_err(&client->dev, "faults detected: 0x%1.1x\n", rval);
280 return -EIO;
281 }
282
283 mutex_lock(flash->ctrls.lock);
284 rval = adp1653_update_hw(flash);
285 mutex_unlock(flash->ctrls.lock);
286 if (rval) {
287 dev_err(&client->dev,
288 "adp1653_update_hw failed at %s\n", __func__);
289 return -EIO;
290 }
291
292 return 0;
293}
294
295static int
296__adp1653_set_power(struct adp1653_flash *flash, int on)
297{
298 int ret;
299
300 if (flash->platform_data->power) {
301 ret = flash->platform_data->power(&flash->subdev, on);
302 if (ret < 0)
303 return ret;
304 } else {
305 gpiod_set_value(flash->platform_data->enable_gpio, on);
306 if (on)
307
308 udelay(20);
309 }
310
311 if (!on)
312 return 0;
313
314 ret = adp1653_init_device(flash);
315 if (ret >= 0)
316 return ret;
317
318 if (flash->platform_data->power)
319 flash->platform_data->power(&flash->subdev, 0);
320 else
321 gpiod_set_value(flash->platform_data->enable_gpio, 0);
322
323 return ret;
324}
325
326static int
327adp1653_set_power(struct v4l2_subdev *subdev, int on)
328{
329 struct adp1653_flash *flash = to_adp1653_flash(subdev);
330 int ret = 0;
331
332 mutex_lock(&flash->power_lock);
333
334
335
336
337 if (flash->power_count == !on) {
338 ret = __adp1653_set_power(flash, !!on);
339 if (ret < 0)
340 goto done;
341 }
342
343
344 flash->power_count += on ? 1 : -1;
345 WARN_ON(flash->power_count < 0);
346
347done:
348 mutex_unlock(&flash->power_lock);
349 return ret;
350}
351
352static int adp1653_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
353{
354 return adp1653_set_power(sd, 1);
355}
356
357static int adp1653_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
358{
359 return adp1653_set_power(sd, 0);
360}
361
362static const struct v4l2_subdev_core_ops adp1653_core_ops = {
363 .s_power = adp1653_set_power,
364};
365
366static const struct v4l2_subdev_ops adp1653_ops = {
367 .core = &adp1653_core_ops,
368};
369
370static const struct v4l2_subdev_internal_ops adp1653_internal_ops = {
371 .open = adp1653_open,
372 .close = adp1653_close,
373};
374
375
376
377
378#ifdef CONFIG_PM
379
380static int adp1653_suspend(struct device *dev)
381{
382 struct v4l2_subdev *subdev = dev_get_drvdata(dev);
383 struct adp1653_flash *flash = to_adp1653_flash(subdev);
384
385 if (!flash->power_count)
386 return 0;
387
388 return __adp1653_set_power(flash, 0);
389}
390
391static int adp1653_resume(struct device *dev)
392{
393 struct v4l2_subdev *subdev = dev_get_drvdata(dev);
394 struct adp1653_flash *flash = to_adp1653_flash(subdev);
395
396 if (!flash->power_count)
397 return 0;
398
399 return __adp1653_set_power(flash, 1);
400}
401
402#else
403
404#define adp1653_suspend NULL
405#define adp1653_resume NULL
406
407#endif
408
409static int adp1653_of_init(struct i2c_client *client,
410 struct adp1653_flash *flash,
411 struct device_node *node)
412{
413 struct adp1653_platform_data *pd;
414 struct device_node *child;
415
416 pd = devm_kzalloc(&client->dev, sizeof(*pd), GFP_KERNEL);
417 if (!pd)
418 return -ENOMEM;
419 flash->platform_data = pd;
420
421 child = of_get_child_by_name(node, "flash");
422 if (!child)
423 return -EINVAL;
424
425 if (of_property_read_u32(child, "flash-timeout-us",
426 &pd->max_flash_timeout))
427 goto err;
428
429 if (of_property_read_u32(child, "flash-max-microamp",
430 &pd->max_flash_intensity))
431 goto err;
432
433 pd->max_flash_intensity /= 1000;
434
435 if (of_property_read_u32(child, "led-max-microamp",
436 &pd->max_torch_intensity))
437 goto err;
438
439 pd->max_torch_intensity /= 1000;
440 of_node_put(child);
441
442 child = of_get_child_by_name(node, "indicator");
443 if (!child)
444 return -EINVAL;
445
446 if (of_property_read_u32(child, "led-max-microamp",
447 &pd->max_indicator_intensity))
448 goto err;
449
450 of_node_put(child);
451
452 pd->enable_gpio = devm_gpiod_get(&client->dev, "enable", GPIOD_OUT_LOW);
453 if (IS_ERR(pd->enable_gpio)) {
454 dev_err(&client->dev, "Error getting GPIO\n");
455 return PTR_ERR(pd->enable_gpio);
456 }
457
458 return 0;
459err:
460 dev_err(&client->dev, "Required property not found\n");
461 of_node_put(child);
462 return -EINVAL;
463}
464
465
466static int adp1653_probe(struct i2c_client *client,
467 const struct i2c_device_id *devid)
468{
469 struct adp1653_flash *flash;
470 int ret;
471
472 flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
473 if (flash == NULL)
474 return -ENOMEM;
475
476 if (client->dev.of_node) {
477 ret = adp1653_of_init(client, flash, client->dev.of_node);
478 if (ret)
479 return ret;
480 } else {
481 if (!client->dev.platform_data) {
482 dev_err(&client->dev,
483 "Neither DT not platform data provided\n");
484 return -EINVAL;
485 }
486 flash->platform_data = client->dev.platform_data;
487 }
488
489 mutex_init(&flash->power_lock);
490
491 v4l2_i2c_subdev_init(&flash->subdev, client, &adp1653_ops);
492 flash->subdev.internal_ops = &adp1653_internal_ops;
493 flash->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
494
495 ret = adp1653_init_controls(flash);
496 if (ret)
497 goto free_and_quit;
498
499 ret = media_entity_pads_init(&flash->subdev.entity, 0, NULL);
500 if (ret < 0)
501 goto free_and_quit;
502
503 flash->subdev.entity.function = MEDIA_ENT_F_FLASH;
504
505 return 0;
506
507free_and_quit:
508 dev_err(&client->dev, "adp1653: failed to register device\n");
509 v4l2_ctrl_handler_free(&flash->ctrls);
510 return ret;
511}
512
513static int adp1653_remove(struct i2c_client *client)
514{
515 struct v4l2_subdev *subdev = i2c_get_clientdata(client);
516 struct adp1653_flash *flash = to_adp1653_flash(subdev);
517
518 v4l2_device_unregister_subdev(&flash->subdev);
519 v4l2_ctrl_handler_free(&flash->ctrls);
520 media_entity_cleanup(&flash->subdev.entity);
521
522 return 0;
523}
524
525static const struct i2c_device_id adp1653_id_table[] = {
526 { ADP1653_NAME, 0 },
527 { }
528};
529MODULE_DEVICE_TABLE(i2c, adp1653_id_table);
530
531static const struct dev_pm_ops adp1653_pm_ops = {
532 .suspend = adp1653_suspend,
533 .resume = adp1653_resume,
534};
535
536static struct i2c_driver adp1653_i2c_driver = {
537 .driver = {
538 .name = ADP1653_NAME,
539 .pm = &adp1653_pm_ops,
540 },
541 .probe = adp1653_probe,
542 .remove = adp1653_remove,
543 .id_table = adp1653_id_table,
544};
545
546module_i2c_driver(adp1653_i2c_driver);
547
548MODULE_AUTHOR("Sakari Ailus <sakari.ailus@nokia.com>");
549MODULE_DESCRIPTION("Analog Devices ADP1653 LED flash driver");
550MODULE_LICENSE("GPL");
551
