1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * drivers/media/i2c/adp1653.c
4 *
5 * Copyright (C) 2008--2011 Nokia Corporation
6 *
7 * Contact: Sakari Ailus <sakari.ailus@iki.fi>
8 *
9 * Contributors:
10 *	Sakari Ailus <sakari.ailus@iki.fi>
11 *	Tuukka Toivonen <tuukkat76@gmail.com>
12 *	Pavel Machek <pavel@ucw.cz>
13 *
14 * TODO:
15 * - fault interrupt handling
16 * - hardware strobe
17 * - power doesn't need to be ON if all lights are off
18 */
19
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/* Write values into ADP1653 registers. */
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		/* Flash mode, light on with strobe, duration from timer */
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		/* Torch mode, light immediately on, duration indefinite */
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	/* Clear faults. */
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	/* Software strobe using i2c */
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 * V4L2 controls
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 * V4L2 subdev operations
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	/* Clear FAULT register by writing zero to OUT_SEL */
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	/* Reset faults before reading new ones. */
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			/* Some delay is apparently required. */
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	/* If the power count is modified from 0 to != 0 or from != 0 to 0,
335	 * update the power state.
336	 */
337	if (flash->power_count == !on) {
338		ret = __adp1653_set_power(flash, !!on);
339		if (ret < 0)
340			goto done;
341	}
342
343	/* Update the power count. */
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 * I2C driver
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 /* CONFIG_PM */
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 *node_indicator = NULL;
415	struct device_node *node_flash;
416
417	pd = devm_kzalloc(&client->dev, sizeof(*pd), GFP_KERNEL);
418	if (!pd)
419		return -ENOMEM;
420	flash->platform_data = pd;
421
422	node_flash = of_get_child_by_name(node, "flash");
423	if (!node_flash)
424		return -EINVAL;
425
426	if (of_property_read_u32(node_flash, "flash-timeout-us",
427				 &pd->max_flash_timeout))
428		goto err;
429
430	if (of_property_read_u32(node_flash, "flash-max-microamp",
431				 &pd->max_flash_intensity))
432		goto err;
433
434	pd->max_flash_intensity /= 1000;
435
436	if (of_property_read_u32(node_flash, "led-max-microamp",
437				 &pd->max_torch_intensity))
438		goto err;
439
440	pd->max_torch_intensity /= 1000;
441
442	node_indicator = of_get_child_by_name(node, "indicator");
443	if (!node_indicator)
444		goto err;
445
446	if (of_property_read_u32(node_indicator, "led-max-microamp",
447				 &pd->max_indicator_intensity))
448		goto err;
449
450	of_node_put(node_flash);
451	of_node_put(node_indicator);
452
453	pd->enable_gpio = devm_gpiod_get(&client->dev, "enable", GPIOD_OUT_LOW);
454	if (IS_ERR(pd->enable_gpio)) {
455		dev_err(&client->dev, "Error getting GPIO\n");
456		return PTR_ERR(pd->enable_gpio);
457	}
458
459	return 0;
460err:
461	dev_err(&client->dev, "Required property not found\n");
462	of_node_put(node_flash);
463	of_node_put(node_indicator);
464	return -EINVAL;
465}
466
467
468static int adp1653_probe(struct i2c_client *client)
469{
470	struct adp1653_flash *flash;
471	int ret;
472
473	flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
474	if (flash == NULL)
475		return -ENOMEM;
476
477	if (client->dev.of_node) {
478		ret = adp1653_of_init(client, flash, client->dev.of_node);
479		if (ret)
480			return ret;
481	} else {
482		if (!client->dev.platform_data) {
483			dev_err(&client->dev,
484				"Neither DT not platform data provided\n");
485			return -EINVAL;
486		}
487		flash->platform_data = client->dev.platform_data;
488	}
489
490	mutex_init(&flash->power_lock);
491
492	v4l2_i2c_subdev_init(&flash->subdev, client, &adp1653_ops);
493	flash->subdev.internal_ops = &adp1653_internal_ops;
494	flash->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
495
496	ret = adp1653_init_controls(flash);
497	if (ret)
498		goto free_and_quit;
499
500	ret = media_entity_pads_init(&flash->subdev.entity, 0, NULL);
501	if (ret < 0)
502		goto free_and_quit;
503
504	flash->subdev.entity.function = MEDIA_ENT_F_FLASH;
505
506	return 0;
507
508free_and_quit:
509	dev_err(&client->dev, "adp1653: failed to register device\n");
510	v4l2_ctrl_handler_free(&flash->ctrls);
511	return ret;
512}
513
514static void adp1653_remove(struct i2c_client *client)
515{
516	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
517	struct adp1653_flash *flash = to_adp1653_flash(subdev);
518
519	v4l2_device_unregister_subdev(&flash->subdev);
520	v4l2_ctrl_handler_free(&flash->ctrls);
521	media_entity_cleanup(&flash->subdev.entity);
522}
523
524static const struct i2c_device_id adp1653_id_table[] = {
525	{ ADP1653_NAME, 0 },
526	{ }
527};
528MODULE_DEVICE_TABLE(i2c, adp1653_id_table);
529
530static const struct dev_pm_ops adp1653_pm_ops = {
531	.suspend	= adp1653_suspend,
532	.resume		= adp1653_resume,
533};
534
535static struct i2c_driver adp1653_i2c_driver = {
536	.driver		= {
537		.name	= ADP1653_NAME,
538		.pm	= &adp1653_pm_ops,
539	},
540	.probe		= adp1653_probe,
541	.remove		= adp1653_remove,
542	.id_table	= adp1653_id_table,
543};
544
545module_i2c_driver(adp1653_i2c_driver);
546
547MODULE_AUTHOR("Sakari Ailus <sakari.ailus@nokia.com>");
548MODULE_DESCRIPTION("Analog Devices ADP1653 LED flash driver");
549MODULE_LICENSE("GPL");
550