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 int 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 return 0;
182 }
183
184 static struct platform_driver adp5520_led_driver = {
185 .driver = {
186 .name = "adp5520-led",
187 },
188 .probe = adp5520_led_probe,
189 .remove = adp5520_led_remove,
190 };
191
192 module_platform_driver(adp5520_led_driver);
193
194 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
195 MODULE_DESCRIPTION("LEDS ADP5520(01) Driver");
196 MODULE_LICENSE("GPL");
197 MODULE_ALIAS("platform:adp5520-led");
198