1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * LEDs driver for Analog Devices ADP5520/ADP5501 MFD PMICs
4 *
5 * Copyright 2009 Analog Devices Inc.
6 *
7 * Loosely derived from leds-da903x:
8 * Copyright (C) 2008 Compulab, Ltd.
9 *	Mike Rapoport <mike@compulab.co.il>
10 *
11 * Copyright (C) 2006-2008 Marvell International Ltd.
12 *	Eric Miao <eric.miao@marvell.com>
13 */
14
15#include <linux/module.h>
16#include <linux/kernel.h>
17#include <linux/platform_device.h>
18#include <linux/leds.h>
19#include <linux/mfd/adp5520.h>
20#include <linux/slab.h>
21
22struct adp5520_led {
23	struct led_classdev	cdev;
24	struct device		*master;
25	int			id;
26	int			flags;
27};
28
29static int adp5520_led_set(struct led_classdev *led_cdev,
30			   enum led_brightness value)
31{
32	struct adp5520_led *led;
33
34	led = container_of(led_cdev, struct adp5520_led, cdev);
35	return adp5520_write(led->master, ADP5520_LED1_CURRENT + led->id - 1,
36			 value >> 2);
37}
38
39static int adp5520_led_setup(struct adp5520_led *led)
40{
41	struct device *dev = led->master;
42	int flags = led->flags;
43	int ret = 0;
44
45	switch (led->id) {
46	case FLAG_ID_ADP5520_LED1_ADP5501_LED0:
47		ret |= adp5520_set_bits(dev, ADP5520_LED_TIME,
48					(flags >> ADP5520_FLAG_OFFT_SHIFT) &
49					ADP5520_FLAG_OFFT_MASK);
50		ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL,
51					ADP5520_LED1_EN);
52		break;
53	case FLAG_ID_ADP5520_LED2_ADP5501_LED1:
54		ret |= adp5520_set_bits(dev,  ADP5520_LED_TIME,
55					((flags >> ADP5520_FLAG_OFFT_SHIFT) &
56					ADP5520_FLAG_OFFT_MASK) << 2);
57		ret |= adp5520_clr_bits(dev, ADP5520_LED_CONTROL,
58					 ADP5520_R3_MODE);
59		ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL,
60					ADP5520_LED2_EN);
61		break;
62	case FLAG_ID_ADP5520_LED3_ADP5501_LED2:
63		ret |= adp5520_set_bits(dev,  ADP5520_LED_TIME,
64					((flags >> ADP5520_FLAG_OFFT_SHIFT) &
65					ADP5520_FLAG_OFFT_MASK) << 4);
66		ret |= adp5520_clr_bits(dev, ADP5520_LED_CONTROL,
67					ADP5520_C3_MODE);
68		ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL,
69					ADP5520_LED3_EN);
70		break;
71	}
72
73	return ret;
74}
75
76static int adp5520_led_prepare(struct platform_device *pdev)
77{
78	struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
79	struct device *dev = pdev->dev.parent;
80	int ret = 0;
81
82	ret |= adp5520_write(dev, ADP5520_LED1_CURRENT, 0);
83	ret |= adp5520_write(dev, ADP5520_LED2_CURRENT, 0);
84	ret |= adp5520_write(dev, ADP5520_LED3_CURRENT, 0);
85	ret |= adp5520_write(dev, ADP5520_LED_TIME, pdata->led_on_time << 6);
86	ret |= adp5520_write(dev, ADP5520_LED_FADE, FADE_VAL(pdata->fade_in,
87		 pdata->fade_out));
88
89	return ret;
90}
91
92static int adp5520_led_probe(struct platform_device *pdev)
93{
94	struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
95	struct adp5520_led *led, *led_dat;
96	struct led_info *cur_led;
97	int ret, i;
98
99	if (pdata == NULL) {
100		dev_err(&pdev->dev, "missing platform data\n");
101		return -ENODEV;
102	}
103
104	if (pdata->num_leds > ADP5520_01_MAXLEDS) {
105		dev_err(&pdev->dev, "can't handle more than %d LEDS\n",
106				 ADP5520_01_MAXLEDS);
107		return -EFAULT;
108	}
109
110	led = devm_kcalloc(&pdev->dev, pdata->num_leds, sizeof(*led),
111				GFP_KERNEL);
112	if (!led)
113		return -ENOMEM;
114
115	ret = adp5520_led_prepare(pdev);
116	if (ret) {
117		dev_err(&pdev->dev, "failed to write\n");
118		return ret;
119	}
120
121	for (i = 0; i < pdata->num_leds; ++i) {
122		cur_led = &pdata->leds[i];
123		led_dat = &led[i];
124
125		led_dat->cdev.name = cur_led->name;
126		led_dat->cdev.default_trigger = cur_led->default_trigger;
127		led_dat->cdev.brightness_set_blocking = adp5520_led_set;
128		led_dat->cdev.brightness = LED_OFF;
129
130		if (cur_led->flags & ADP5520_FLAG_LED_MASK)
131			led_dat->flags = cur_led->flags;
132		else
133			led_dat->flags = i + 1;
134
135		led_dat->id = led_dat->flags & ADP5520_FLAG_LED_MASK;
136
137		led_dat->master = pdev->dev.parent;
138
139		ret = led_classdev_register(led_dat->master, &led_dat->cdev);
140		if (ret) {
141			dev_err(&pdev->dev, "failed to register LED %d\n",
142				led_dat->id);
143			goto err;
144		}
145
146		ret = adp5520_led_setup(led_dat);
147		if (ret) {
148			dev_err(&pdev->dev, "failed to write\n");
149			i++;
150			goto err;
151		}
152	}
153
154	platform_set_drvdata(pdev, led);
155	return 0;
156
157err:
158	if (i > 0) {
159		for (i = i - 1; i >= 0; i--)
160			led_classdev_unregister(&led[i].cdev);
161	}
162
163	return ret;
164}
165
166static void adp5520_led_remove(struct platform_device *pdev)
167{
168	struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
169	struct adp5520_led *led;
170	int i;
171
172	led = platform_get_drvdata(pdev);
173
174	adp5520_clr_bits(led->master, ADP5520_LED_CONTROL,
175		 ADP5520_LED1_EN | ADP5520_LED2_EN | ADP5520_LED3_EN);
176
177	for (i = 0; i < pdata->num_leds; i++) {
178		led_classdev_unregister(&led[i].cdev);
179	}
180}
181
182static struct platform_driver adp5520_led_driver = {
183	.driver	= {
184		.name	= "adp5520-led",
185	},
186	.probe		= adp5520_led_probe,
187	.remove_new	= adp5520_led_remove,
188};
189
190module_platform_driver(adp5520_led_driver);
191
192MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
193MODULE_DESCRIPTION("LEDS ADP5520(01) Driver");
194MODULE_LICENSE("GPL");
195MODULE_ALIAS("platform:adp5520-led");
196