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 
22 struct adp5520_led {
23 	struct led_classdev	cdev;
24 	struct device		*master;
25 	int			id;
26 	int			flags;
27 };
28 
adp5520_led_set(struct led_classdev * led_cdev,enum led_brightness value)29 static 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 
adp5520_led_setup(struct adp5520_led * led)39 static 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 
adp5520_led_prepare(struct platform_device * pdev)76 static 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 
adp5520_led_probe(struct platform_device * pdev)92 static 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 
157 err:
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 
adp5520_led_remove(struct platform_device * pdev)166 static 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 
182 static 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 
190 module_platform_driver(adp5520_led_driver);
191 
192 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
193 MODULE_DESCRIPTION("LEDS ADP5520(01) Driver");
194 MODULE_LICENSE("GPL");
195 MODULE_ALIAS("platform:adp5520-led");
196