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