1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Backlight driver for Analog Devices ADP5520/ADP5501 MFD PMICs
4 *
5 * Copyright 2009 Analog Devices Inc.
6 */
7
8#include <linux/kernel.h>
9#include <linux/init.h>
10#include <linux/platform_device.h>
11#include <linux/fb.h>
12#include <linux/backlight.h>
13#include <linux/mfd/adp5520.h>
14#include <linux/slab.h>
15#include <linux/module.h>
16
17struct adp5520_bl {
18	struct device *master;
19	struct adp5520_backlight_platform_data *pdata;
20	struct mutex lock;
21	unsigned long cached_daylight_max;
22	int id;
23	int current_brightness;
24};
25
26static int adp5520_bl_set(struct backlight_device *bl, int brightness)
27{
28	struct adp5520_bl *data = bl_get_data(bl);
29	struct device *master = data->master;
30	int ret = 0;
31
32	if (data->pdata->en_ambl_sens) {
33		if ((brightness > 0) && (brightness < ADP5020_MAX_BRIGHTNESS)) {
34			/* Disable Ambient Light auto adjust */
35			ret |= adp5520_clr_bits(master, ADP5520_BL_CONTROL,
36					ADP5520_BL_AUTO_ADJ);
37			ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
38					brightness);
39		} else {
40			/*
41			 * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust
42			 * restore daylight l3 sysfs brightness
43			 */
44			ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
45					 data->cached_daylight_max);
46			ret |= adp5520_set_bits(master, ADP5520_BL_CONTROL,
47					 ADP5520_BL_AUTO_ADJ);
48		}
49	} else {
50		ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX, brightness);
51	}
52
53	if (data->current_brightness && brightness == 0)
54		ret |= adp5520_set_bits(master,
55				ADP5520_MODE_STATUS, ADP5520_DIM_EN);
56	else if (data->current_brightness == 0 && brightness)
57		ret |= adp5520_clr_bits(master,
58				ADP5520_MODE_STATUS, ADP5520_DIM_EN);
59
60	if (!ret)
61		data->current_brightness = brightness;
62
63	return ret;
64}
65
66static int adp5520_bl_update_status(struct backlight_device *bl)
67{
68	return adp5520_bl_set(bl, backlight_get_brightness(bl));
69}
70
71static int adp5520_bl_get_brightness(struct backlight_device *bl)
72{
73	struct adp5520_bl *data = bl_get_data(bl);
74	int error;
75	uint8_t reg_val;
76
77	error = adp5520_read(data->master, ADP5520_BL_VALUE, &reg_val);
78
79	return error ? data->current_brightness : reg_val;
80}
81
82static const struct backlight_ops adp5520_bl_ops = {
83	.update_status	= adp5520_bl_update_status,
84	.get_brightness	= adp5520_bl_get_brightness,
85};
86
87static int adp5520_bl_setup(struct backlight_device *bl)
88{
89	struct adp5520_bl *data = bl_get_data(bl);
90	struct device *master = data->master;
91	struct adp5520_backlight_platform_data *pdata = data->pdata;
92	int ret = 0;
93
94	ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
95				pdata->l1_daylight_max);
96	ret |= adp5520_write(master, ADP5520_DAYLIGHT_DIM,
97				pdata->l1_daylight_dim);
98
99	if (pdata->en_ambl_sens) {
100		data->cached_daylight_max = pdata->l1_daylight_max;
101		ret |= adp5520_write(master, ADP5520_OFFICE_MAX,
102				pdata->l2_office_max);
103		ret |= adp5520_write(master, ADP5520_OFFICE_DIM,
104				pdata->l2_office_dim);
105		ret |= adp5520_write(master, ADP5520_DARK_MAX,
106				pdata->l3_dark_max);
107		ret |= adp5520_write(master, ADP5520_DARK_DIM,
108				pdata->l3_dark_dim);
109		ret |= adp5520_write(master, ADP5520_L2_TRIP,
110				pdata->l2_trip);
111		ret |= adp5520_write(master, ADP5520_L2_HYS,
112				pdata->l2_hyst);
113		ret |= adp5520_write(master, ADP5520_L3_TRIP,
114				 pdata->l3_trip);
115		ret |= adp5520_write(master, ADP5520_L3_HYS,
116				pdata->l3_hyst);
117		ret |= adp5520_write(master, ADP5520_ALS_CMPR_CFG,
118				ALS_CMPR_CFG_VAL(pdata->abml_filt,
119				ADP5520_L3_EN));
120	}
121
122	ret |= adp5520_write(master, ADP5520_BL_CONTROL,
123			BL_CTRL_VAL(pdata->fade_led_law,
124					pdata->en_ambl_sens));
125
126	ret |= adp5520_write(master, ADP5520_BL_FADE, FADE_VAL(pdata->fade_in,
127			pdata->fade_out));
128
129	ret |= adp5520_set_bits(master, ADP5520_MODE_STATUS,
130			ADP5520_BL_EN | ADP5520_DIM_EN);
131
132	return ret;
133}
134
135static ssize_t adp5520_show(struct device *dev, char *buf, int reg)
136{
137	struct adp5520_bl *data = dev_get_drvdata(dev);
138	int ret;
139	uint8_t reg_val;
140
141	mutex_lock(&data->lock);
142	ret = adp5520_read(data->master, reg, &reg_val);
143	mutex_unlock(&data->lock);
144
145	if (ret < 0)
146		return ret;
147
148	return sprintf(buf, "%u\n", reg_val);
149}
150
151static ssize_t adp5520_store(struct device *dev, const char *buf,
152			 size_t count, int reg)
153{
154	struct adp5520_bl *data = dev_get_drvdata(dev);
155	unsigned long val;
156	int ret;
157
158	ret = kstrtoul(buf, 10, &val);
159	if (ret)
160		return ret;
161
162	mutex_lock(&data->lock);
163	adp5520_write(data->master, reg, val);
164	mutex_unlock(&data->lock);
165
166	return count;
167}
168
169static ssize_t adp5520_bl_dark_max_show(struct device *dev,
170			struct device_attribute *attr, char *buf)
171{
172	return adp5520_show(dev, buf, ADP5520_DARK_MAX);
173}
174
175static ssize_t adp5520_bl_dark_max_store(struct device *dev,
176			struct device_attribute *attr,
177			const char *buf, size_t count)
178{
179	return adp5520_store(dev, buf, count, ADP5520_DARK_MAX);
180}
181static DEVICE_ATTR(dark_max, 0664, adp5520_bl_dark_max_show,
182			adp5520_bl_dark_max_store);
183
184static ssize_t adp5520_bl_office_max_show(struct device *dev,
185			struct device_attribute *attr, char *buf)
186{
187	return adp5520_show(dev, buf, ADP5520_OFFICE_MAX);
188}
189
190static ssize_t adp5520_bl_office_max_store(struct device *dev,
191			struct device_attribute *attr,
192			const char *buf, size_t count)
193{
194	return adp5520_store(dev, buf, count, ADP5520_OFFICE_MAX);
195}
196static DEVICE_ATTR(office_max, 0664, adp5520_bl_office_max_show,
197			adp5520_bl_office_max_store);
198
199static ssize_t adp5520_bl_daylight_max_show(struct device *dev,
200			struct device_attribute *attr, char *buf)
201{
202	return adp5520_show(dev, buf, ADP5520_DAYLIGHT_MAX);
203}
204
205static ssize_t adp5520_bl_daylight_max_store(struct device *dev,
206			struct device_attribute *attr,
207			const char *buf, size_t count)
208{
209	struct adp5520_bl *data = dev_get_drvdata(dev);
210	int ret;
211
212	ret = kstrtoul(buf, 10, &data->cached_daylight_max);
213	if (ret < 0)
214		return ret;
215
216	return adp5520_store(dev, buf, count, ADP5520_DAYLIGHT_MAX);
217}
218static DEVICE_ATTR(daylight_max, 0664, adp5520_bl_daylight_max_show,
219			adp5520_bl_daylight_max_store);
220
221static ssize_t adp5520_bl_dark_dim_show(struct device *dev,
222			struct device_attribute *attr, char *buf)
223{
224	return adp5520_show(dev, buf, ADP5520_DARK_DIM);
225}
226
227static ssize_t adp5520_bl_dark_dim_store(struct device *dev,
228			struct device_attribute *attr,
229			const char *buf, size_t count)
230{
231	return adp5520_store(dev, buf, count, ADP5520_DARK_DIM);
232}
233static DEVICE_ATTR(dark_dim, 0664, adp5520_bl_dark_dim_show,
234			adp5520_bl_dark_dim_store);
235
236static ssize_t adp5520_bl_office_dim_show(struct device *dev,
237			struct device_attribute *attr, char *buf)
238{
239	return adp5520_show(dev, buf, ADP5520_OFFICE_DIM);
240}
241
242static ssize_t adp5520_bl_office_dim_store(struct device *dev,
243			struct device_attribute *attr,
244			const char *buf, size_t count)
245{
246	return adp5520_store(dev, buf, count, ADP5520_OFFICE_DIM);
247}
248static DEVICE_ATTR(office_dim, 0664, adp5520_bl_office_dim_show,
249			adp5520_bl_office_dim_store);
250
251static ssize_t adp5520_bl_daylight_dim_show(struct device *dev,
252			struct device_attribute *attr, char *buf)
253{
254	return adp5520_show(dev, buf, ADP5520_DAYLIGHT_DIM);
255}
256
257static ssize_t adp5520_bl_daylight_dim_store(struct device *dev,
258			struct device_attribute *attr,
259			const char *buf, size_t count)
260{
261	return adp5520_store(dev, buf, count, ADP5520_DAYLIGHT_DIM);
262}
263static DEVICE_ATTR(daylight_dim, 0664, adp5520_bl_daylight_dim_show,
264			adp5520_bl_daylight_dim_store);
265
266static struct attribute *adp5520_bl_attributes[] = {
267	&dev_attr_dark_max.attr,
268	&dev_attr_dark_dim.attr,
269	&dev_attr_office_max.attr,
270	&dev_attr_office_dim.attr,
271	&dev_attr_daylight_max.attr,
272	&dev_attr_daylight_dim.attr,
273	NULL
274};
275
276static const struct attribute_group adp5520_bl_attr_group = {
277	.attrs = adp5520_bl_attributes,
278};
279
280static int adp5520_bl_probe(struct platform_device *pdev)
281{
282	struct backlight_properties props;
283	struct backlight_device *bl;
284	struct adp5520_bl *data;
285	int ret = 0;
286
287	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
288	if (data == NULL)
289		return -ENOMEM;
290
291	data->master = pdev->dev.parent;
292	data->pdata = dev_get_platdata(&pdev->dev);
293
294	if (data->pdata  == NULL) {
295		dev_err(&pdev->dev, "missing platform data\n");
296		return -ENODEV;
297	}
298
299	data->id = pdev->id;
300	data->current_brightness = 0;
301
302	mutex_init(&data->lock);
303
304	memset(&props, 0, sizeof(struct backlight_properties));
305	props.type = BACKLIGHT_RAW;
306	props.max_brightness = ADP5020_MAX_BRIGHTNESS;
307	bl = devm_backlight_device_register(&pdev->dev, pdev->name,
308					data->master, data, &adp5520_bl_ops,
309					&props);
310	if (IS_ERR(bl)) {
311		dev_err(&pdev->dev, "failed to register backlight\n");
312		return PTR_ERR(bl);
313	}
314
315	bl->props.brightness = ADP5020_MAX_BRIGHTNESS;
316	if (data->pdata->en_ambl_sens)
317		ret = sysfs_create_group(&bl->dev.kobj,
318			&adp5520_bl_attr_group);
319
320	if (ret) {
321		dev_err(&pdev->dev, "failed to register sysfs\n");
322		return ret;
323	}
324
325	platform_set_drvdata(pdev, bl);
326	ret = adp5520_bl_setup(bl);
327	if (ret) {
328		dev_err(&pdev->dev, "failed to setup\n");
329		if (data->pdata->en_ambl_sens)
330			sysfs_remove_group(&bl->dev.kobj,
331					&adp5520_bl_attr_group);
332		return ret;
333	}
334
335	backlight_update_status(bl);
336
337	return 0;
338}
339
340static void adp5520_bl_remove(struct platform_device *pdev)
341{
342	struct backlight_device *bl = platform_get_drvdata(pdev);
343	struct adp5520_bl *data = bl_get_data(bl);
344
345	adp5520_clr_bits(data->master, ADP5520_MODE_STATUS, ADP5520_BL_EN);
346
347	if (data->pdata->en_ambl_sens)
348		sysfs_remove_group(&bl->dev.kobj,
349				&adp5520_bl_attr_group);
350}
351
352#ifdef CONFIG_PM_SLEEP
353static int adp5520_bl_suspend(struct device *dev)
354{
355	struct backlight_device *bl = dev_get_drvdata(dev);
356
357	return adp5520_bl_set(bl, 0);
358}
359
360static int adp5520_bl_resume(struct device *dev)
361{
362	struct backlight_device *bl = dev_get_drvdata(dev);
363
364	backlight_update_status(bl);
365	return 0;
366}
367#endif
368
369static SIMPLE_DEV_PM_OPS(adp5520_bl_pm_ops, adp5520_bl_suspend,
370			adp5520_bl_resume);
371
372static struct platform_driver adp5520_bl_driver = {
373	.driver		= {
374		.name	= "adp5520-backlight",
375		.pm	= &adp5520_bl_pm_ops,
376	},
377	.probe		= adp5520_bl_probe,
378	.remove_new	= adp5520_bl_remove,
379};
380
381module_platform_driver(adp5520_bl_driver);
382
383MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
384MODULE_DESCRIPTION("ADP5520(01) Backlight Driver");
385MODULE_LICENSE("GPL");
386MODULE_ALIAS("platform:adp5520-backlight");
387