2 * LEDs driver for Analog Devices ADP5520/ADP5501 MFD PMICs
4 * Copyright 2009 Analog Devices Inc.
6 * Loosely derived from leds-da903x:
7 * Copyright (C) 2008 Compulab, Ltd.
8 * Mike Rapoport <mike@compulab.co.il>
10 * Copyright (C) 2006-2008 Marvell International Ltd.
11 * Eric Miao <eric.miao@marvell.com>
13 * Licensed under the GPL-2 or later.
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/init.h>
19 #include <linux/platform_device.h>
20 #include <linux/leds.h>
21 #include <linux/workqueue.h>
22 #include <linux/mfd/adp5520.h>
23 #include <linux/slab.h>
26 struct led_classdev cdev;
27 struct work_struct work;
28 struct device *master;
29 enum led_brightness new_brightness;
34 static void adp5520_led_work(struct work_struct *work)
36 struct adp5520_led *led = container_of(work, struct adp5520_led, work);
37 adp5520_write(led->master, ADP5520_LED1_CURRENT + led->id - 1,
38 led->new_brightness >> 2);
41 static void adp5520_led_set(struct led_classdev *led_cdev,
42 enum led_brightness value)
44 struct adp5520_led *led;
46 led = container_of(led_cdev, struct adp5520_led, cdev);
47 led->new_brightness = value;
48 schedule_work(&led->work);
51 static int adp5520_led_setup(struct adp5520_led *led)
53 struct device *dev = led->master;
54 int flags = led->flags;
58 case FLAG_ID_ADP5520_LED1_ADP5501_LED0:
59 ret |= adp5520_set_bits(dev, ADP5520_LED_TIME,
60 (flags >> ADP5520_FLAG_OFFT_SHIFT) &
61 ADP5520_FLAG_OFFT_MASK);
62 ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL,
65 case FLAG_ID_ADP5520_LED2_ADP5501_LED1:
66 ret |= adp5520_set_bits(dev, ADP5520_LED_TIME,
67 ((flags >> ADP5520_FLAG_OFFT_SHIFT) &
68 ADP5520_FLAG_OFFT_MASK) << 2);
69 ret |= adp5520_clr_bits(dev, ADP5520_LED_CONTROL,
71 ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL,
74 case FLAG_ID_ADP5520_LED3_ADP5501_LED2:
75 ret |= adp5520_set_bits(dev, ADP5520_LED_TIME,
76 ((flags >> ADP5520_FLAG_OFFT_SHIFT) &
77 ADP5520_FLAG_OFFT_MASK) << 4);
78 ret |= adp5520_clr_bits(dev, ADP5520_LED_CONTROL,
80 ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL,
88 static int adp5520_led_prepare(struct platform_device *pdev)
90 struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
91 struct device *dev = pdev->dev.parent;
94 ret |= adp5520_write(dev, ADP5520_LED1_CURRENT, 0);
95 ret |= adp5520_write(dev, ADP5520_LED2_CURRENT, 0);
96 ret |= adp5520_write(dev, ADP5520_LED3_CURRENT, 0);
97 ret |= adp5520_write(dev, ADP5520_LED_TIME, pdata->led_on_time << 6);
98 ret |= adp5520_write(dev, ADP5520_LED_FADE, FADE_VAL(pdata->fade_in,
104 static int adp5520_led_probe(struct platform_device *pdev)
106 struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
107 struct adp5520_led *led, *led_dat;
108 struct led_info *cur_led;
112 dev_err(&pdev->dev, "missing platform data\n");
116 if (pdata->num_leds > ADP5520_01_MAXLEDS) {
117 dev_err(&pdev->dev, "can't handle more than %d LEDS\n",
122 led = devm_kzalloc(&pdev->dev, sizeof(*led) * pdata->num_leds,
125 dev_err(&pdev->dev, "failed to alloc memory\n");
129 ret = adp5520_led_prepare(pdev);
132 dev_err(&pdev->dev, "failed to write\n");
136 for (i = 0; i < pdata->num_leds; ++i) {
137 cur_led = &pdata->leds[i];
140 led_dat->cdev.name = cur_led->name;
141 led_dat->cdev.default_trigger = cur_led->default_trigger;
142 led_dat->cdev.brightness_set = adp5520_led_set;
143 led_dat->cdev.brightness = LED_OFF;
145 if (cur_led->flags & ADP5520_FLAG_LED_MASK)
146 led_dat->flags = cur_led->flags;
148 led_dat->flags = i + 1;
150 led_dat->id = led_dat->flags & ADP5520_FLAG_LED_MASK;
152 led_dat->master = pdev->dev.parent;
153 led_dat->new_brightness = LED_OFF;
155 INIT_WORK(&led_dat->work, adp5520_led_work);
157 ret = led_classdev_register(led_dat->master, &led_dat->cdev);
159 dev_err(&pdev->dev, "failed to register LED %d\n",
164 ret = adp5520_led_setup(led_dat);
166 dev_err(&pdev->dev, "failed to write\n");
172 platform_set_drvdata(pdev, led);
177 for (i = i - 1; i >= 0; i--) {
178 led_classdev_unregister(&led[i].cdev);
179 cancel_work_sync(&led[i].work);
186 static int adp5520_led_remove(struct platform_device *pdev)
188 struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
189 struct adp5520_led *led;
192 led = platform_get_drvdata(pdev);
194 adp5520_clr_bits(led->master, ADP5520_LED_CONTROL,
195 ADP5520_LED1_EN | ADP5520_LED2_EN | ADP5520_LED3_EN);
197 for (i = 0; i < pdata->num_leds; i++) {
198 led_classdev_unregister(&led[i].cdev);
199 cancel_work_sync(&led[i].work);
205 static struct platform_driver adp5520_led_driver = {
207 .name = "adp5520-led",
208 .owner = THIS_MODULE,
210 .probe = adp5520_led_probe,
211 .remove = adp5520_led_remove,
214 module_platform_driver(adp5520_led_driver);
216 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
217 MODULE_DESCRIPTION("LEDS ADP5520(01) Driver");
218 MODULE_LICENSE("GPL");
219 MODULE_ALIAS("platform:adp5520-led");