Root/drivers/leds/leds-adp5520.c

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/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>
24
25struct adp5520_led {
26    struct led_classdev cdev;
27    struct work_struct work;
28    struct device *master;
29    enum led_brightness new_brightness;
30    int id;
31    int flags;
32};
33
34static void adp5520_led_work(struct work_struct *work)
35{
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);
39}
40
41static void adp5520_led_set(struct led_classdev *led_cdev,
42               enum led_brightness value)
43{
44    struct adp5520_led *led;
45
46    led = container_of(led_cdev, struct adp5520_led, cdev);
47    led->new_brightness = value;
48    schedule_work(&led->work);
49}
50
51static int adp5520_led_setup(struct adp5520_led *led)
52{
53    struct device *dev = led->master;
54    int flags = led->flags;
55    int ret = 0;
56
57    switch (led->id) {
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,
63                    ADP5520_LED1_EN);
64        break;
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,
70                     ADP5520_R3_MODE);
71        ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL,
72                    ADP5520_LED2_EN);
73        break;
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,
79                    ADP5520_C3_MODE);
80        ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL,
81                    ADP5520_LED3_EN);
82        break;
83    }
84
85    return ret;
86}
87
88static int __devinit adp5520_led_prepare(struct platform_device *pdev)
89{
90    struct adp5520_leds_platform_data *pdata = pdev->dev.platform_data;
91    struct device *dev = pdev->dev.parent;
92    int ret = 0;
93
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,
99         pdata->fade_out));
100
101    return ret;
102}
103
104static int __devinit adp5520_led_probe(struct platform_device *pdev)
105{
106    struct adp5520_leds_platform_data *pdata = pdev->dev.platform_data;
107    struct adp5520_led *led, *led_dat;
108    struct led_info *cur_led;
109    int ret, i;
110
111    if (pdata == NULL) {
112        dev_err(&pdev->dev, "missing platform data\n");
113        return -ENODEV;
114    }
115
116    if (pdata->num_leds > ADP5520_01_MAXLEDS) {
117        dev_err(&pdev->dev, "can't handle more than %d LEDS\n",
118                 ADP5520_01_MAXLEDS);
119        return -EFAULT;
120    }
121
122    led = devm_kzalloc(&pdev->dev, sizeof(*led) * pdata->num_leds,
123                GFP_KERNEL);
124    if (led == NULL) {
125        dev_err(&pdev->dev, "failed to alloc memory\n");
126        return -ENOMEM;
127    }
128
129    ret = adp5520_led_prepare(pdev);
130
131    if (ret) {
132        dev_err(&pdev->dev, "failed to write\n");
133        return ret;
134    }
135
136    for (i = 0; i < pdata->num_leds; ++i) {
137        cur_led = &pdata->leds[i];
138        led_dat = &led[i];
139
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;
144
145        if (cur_led->flags & ADP5520_FLAG_LED_MASK)
146            led_dat->flags = cur_led->flags;
147        else
148            led_dat->flags = i + 1;
149
150        led_dat->id = led_dat->flags & ADP5520_FLAG_LED_MASK;
151
152        led_dat->master = pdev->dev.parent;
153        led_dat->new_brightness = LED_OFF;
154
155        INIT_WORK(&led_dat->work, adp5520_led_work);
156
157        ret = led_classdev_register(led_dat->master, &led_dat->cdev);
158        if (ret) {
159            dev_err(&pdev->dev, "failed to register LED %d\n",
160                led_dat->id);
161            goto err;
162        }
163
164        ret = adp5520_led_setup(led_dat);
165        if (ret) {
166            dev_err(&pdev->dev, "failed to write\n");
167            i++;
168            goto err;
169        }
170    }
171
172    platform_set_drvdata(pdev, led);
173    return 0;
174
175err:
176    if (i > 0) {
177        for (i = i - 1; i >= 0; i--) {
178            led_classdev_unregister(&led[i].cdev);
179            cancel_work_sync(&led[i].work);
180        }
181    }
182
183    return ret;
184}
185
186static int __devexit adp5520_led_remove(struct platform_device *pdev)
187{
188    struct adp5520_leds_platform_data *pdata = pdev->dev.platform_data;
189    struct adp5520_led *led;
190    int i;
191
192    led = platform_get_drvdata(pdev);
193
194    adp5520_clr_bits(led->master, ADP5520_LED_CONTROL,
195         ADP5520_LED1_EN | ADP5520_LED2_EN | ADP5520_LED3_EN);
196
197    for (i = 0; i < pdata->num_leds; i++) {
198        led_classdev_unregister(&led[i].cdev);
199        cancel_work_sync(&led[i].work);
200    }
201
202    return 0;
203}
204
205static struct platform_driver adp5520_led_driver = {
206    .driver = {
207        .name = "adp5520-led",
208        .owner = THIS_MODULE,
209    },
210    .probe = adp5520_led_probe,
211    .remove = __devexit_p(adp5520_led_remove),
212};
213
214module_platform_driver(adp5520_led_driver);
215
216MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
217MODULE_DESCRIPTION("LEDS ADP5520(01) Driver");
218MODULE_LICENSE("GPL");
219MODULE_ALIAS("platform:adp5520-led");
220

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