1/*
2 * LEDs driver for Analog Devices ADP5520/ADP5501 MFD PMICs
3 *
4 * Copyright 2009 Analog Devices Inc.
5 *
6 * Loosely derived from leds-da903x:
7 * Copyright (C) 2008 Compulab, Ltd.
8 *	Mike Rapoport <mike@compulab.co.il>
9 *
10 * Copyright (C) 2006-2008 Marvell International Ltd.
11 *	Eric Miao <eric.miao@marvell.com>
12 *
13 * Licensed under the GPL-2 or later.
14 */
15
16#include <linux/module.h>
17#include <linux/kernel.h>
18#include <linux/platform_device.h>
19#include <linux/leds.h>
20#include <linux/workqueue.h>
21#include <linux/mfd/adp5520.h>
22#include <linux/slab.h>
23
24struct adp5520_led {
25	struct led_classdev	cdev;
26	struct work_struct	work;
27	struct device		*master;
28	enum led_brightness	new_brightness;
29	int			id;
30	int			flags;
31};
32
33static void adp5520_led_work(struct work_struct *work)
34{
35	struct adp5520_led *led = container_of(work, struct adp5520_led, work);
36	adp5520_write(led->master, ADP5520_LED1_CURRENT + led->id - 1,
37			 led->new_brightness >> 2);
38}
39
40static void adp5520_led_set(struct led_classdev *led_cdev,
41			   enum led_brightness value)
42{
43	struct adp5520_led *led;
44
45	led = container_of(led_cdev, struct adp5520_led, cdev);
46	led->new_brightness = value;
47	schedule_work(&led->work);
48}
49
50static int adp5520_led_setup(struct adp5520_led *led)
51{
52	struct device *dev = led->master;
53	int flags = led->flags;
54	int ret = 0;
55
56	switch (led->id) {
57	case FLAG_ID_ADP5520_LED1_ADP5501_LED0:
58		ret |= adp5520_set_bits(dev, ADP5520_LED_TIME,
59					(flags >> ADP5520_FLAG_OFFT_SHIFT) &
60					ADP5520_FLAG_OFFT_MASK);
61		ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL,
62					ADP5520_LED1_EN);
63		break;
64	case FLAG_ID_ADP5520_LED2_ADP5501_LED1:
65		ret |= adp5520_set_bits(dev,  ADP5520_LED_TIME,
66					((flags >> ADP5520_FLAG_OFFT_SHIFT) &
67					ADP5520_FLAG_OFFT_MASK) << 2);
68		ret |= adp5520_clr_bits(dev, ADP5520_LED_CONTROL,
69					 ADP5520_R3_MODE);
70		ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL,
71					ADP5520_LED2_EN);
72		break;
73	case FLAG_ID_ADP5520_LED3_ADP5501_LED2:
74		ret |= adp5520_set_bits(dev,  ADP5520_LED_TIME,
75					((flags >> ADP5520_FLAG_OFFT_SHIFT) &
76					ADP5520_FLAG_OFFT_MASK) << 4);
77		ret |= adp5520_clr_bits(dev, ADP5520_LED_CONTROL,
78					ADP5520_C3_MODE);
79		ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL,
80					ADP5520_LED3_EN);
81		break;
82	}
83
84	return ret;
85}
86
87static int adp5520_led_prepare(struct platform_device *pdev)
88{
89	struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
90	struct device *dev = pdev->dev.parent;
91	int ret = 0;
92
93	ret |= adp5520_write(dev, ADP5520_LED1_CURRENT, 0);
94	ret |= adp5520_write(dev, ADP5520_LED2_CURRENT, 0);
95	ret |= adp5520_write(dev, ADP5520_LED3_CURRENT, 0);
96	ret |= adp5520_write(dev, ADP5520_LED_TIME, pdata->led_on_time << 6);
97	ret |= adp5520_write(dev, ADP5520_LED_FADE, FADE_VAL(pdata->fade_in,
98		 pdata->fade_out));
99
100	return ret;
101}
102
103static int adp5520_led_probe(struct platform_device *pdev)
104{
105	struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
106	struct adp5520_led *led, *led_dat;
107	struct led_info *cur_led;
108	int ret, i;
109
110	if (pdata == NULL) {
111		dev_err(&pdev->dev, "missing platform data\n");
112		return -ENODEV;
113	}
114
115	if (pdata->num_leds > ADP5520_01_MAXLEDS) {
116		dev_err(&pdev->dev, "can't handle more than %d LEDS\n",
117				 ADP5520_01_MAXLEDS);
118		return -EFAULT;
119	}
120
121	led = devm_kzalloc(&pdev->dev, sizeof(*led) * pdata->num_leds,
122				GFP_KERNEL);
123	if (!led)
124		return -ENOMEM;
125
126	ret = adp5520_led_prepare(pdev);
127	if (ret) {
128		dev_err(&pdev->dev, "failed to write\n");
129		return ret;
130	}
131
132	for (i = 0; i < pdata->num_leds; ++i) {
133		cur_led = &pdata->leds[i];
134		led_dat = &led[i];
135
136		led_dat->cdev.name = cur_led->name;
137		led_dat->cdev.default_trigger = cur_led->default_trigger;
138		led_dat->cdev.brightness_set = adp5520_led_set;
139		led_dat->cdev.brightness = LED_OFF;
140
141		if (cur_led->flags & ADP5520_FLAG_LED_MASK)
142			led_dat->flags = cur_led->flags;
143		else
144			led_dat->flags = i + 1;
145
146		led_dat->id = led_dat->flags & ADP5520_FLAG_LED_MASK;
147
148		led_dat->master = pdev->dev.parent;
149		led_dat->new_brightness = LED_OFF;
150
151		INIT_WORK(&led_dat->work, adp5520_led_work);
152
153		ret = led_classdev_register(led_dat->master, &led_dat->cdev);
154		if (ret) {
155			dev_err(&pdev->dev, "failed to register LED %d\n",
156				led_dat->id);
157			goto err;
158		}
159
160		ret = adp5520_led_setup(led_dat);
161		if (ret) {
162			dev_err(&pdev->dev, "failed to write\n");
163			i++;
164			goto err;
165		}
166	}
167
168	platform_set_drvdata(pdev, led);
169	return 0;
170
171err:
172	if (i > 0) {
173		for (i = i - 1; i >= 0; i--) {
174			led_classdev_unregister(&led[i].cdev);
175			cancel_work_sync(&led[i].work);
176		}
177	}
178
179	return ret;
180}
181
182static int adp5520_led_remove(struct platform_device *pdev)
183{
184	struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
185	struct adp5520_led *led;
186	int i;
187
188	led = platform_get_drvdata(pdev);
189
190	adp5520_clr_bits(led->master, ADP5520_LED_CONTROL,
191		 ADP5520_LED1_EN | ADP5520_LED2_EN | ADP5520_LED3_EN);
192
193	for (i = 0; i < pdata->num_leds; i++) {
194		led_classdev_unregister(&led[i].cdev);
195		cancel_work_sync(&led[i].work);
196	}
197
198	return 0;
199}
200
201static struct platform_driver adp5520_led_driver = {
202	.driver	= {
203		.name	= "adp5520-led",
204	},
205	.probe		= adp5520_led_probe,
206	.remove		= adp5520_led_remove,
207};
208
209module_platform_driver(adp5520_led_driver);
210
211MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
212MODULE_DESCRIPTION("LEDS ADP5520(01) Driver");
213MODULE_LICENSE("GPL");
214MODULE_ALIAS("platform:adp5520-led");
215