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ed4a10b4 MH |
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> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
ed4a10b4 MH |
24 | |
25 | struct 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 | ||
34 | static 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 | ||
41 | static 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 | ||
51 | static 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 | ||
88 | static 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 | ||
104 | static 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 = kzalloc(sizeof(*led) * pdata->num_leds, GFP_KERNEL); | |
123 | if (led == NULL) { | |
124 | dev_err(&pdev->dev, "failed to alloc memory\n"); | |
125 | return -ENOMEM; | |
126 | } | |
127 | ||
128 | ret = adp5520_led_prepare(pdev); | |
129 | ||
130 | if (ret) { | |
131 | dev_err(&pdev->dev, "failed to write\n"); | |
132 | goto err_free; | |
133 | } | |
134 | ||
135 | for (i = 0; i < pdata->num_leds; ++i) { | |
136 | cur_led = &pdata->leds[i]; | |
137 | led_dat = &led[i]; | |
138 | ||
139 | led_dat->cdev.name = cur_led->name; | |
140 | led_dat->cdev.default_trigger = cur_led->default_trigger; | |
141 | led_dat->cdev.brightness_set = adp5520_led_set; | |
142 | led_dat->cdev.brightness = LED_OFF; | |
143 | ||
144 | if (cur_led->flags & ADP5520_FLAG_LED_MASK) | |
145 | led_dat->flags = cur_led->flags; | |
146 | else | |
147 | led_dat->flags = i + 1; | |
148 | ||
149 | led_dat->id = led_dat->flags & ADP5520_FLAG_LED_MASK; | |
150 | ||
151 | led_dat->master = pdev->dev.parent; | |
152 | led_dat->new_brightness = LED_OFF; | |
153 | ||
154 | INIT_WORK(&led_dat->work, adp5520_led_work); | |
155 | ||
156 | ret = led_classdev_register(led_dat->master, &led_dat->cdev); | |
157 | if (ret) { | |
158 | dev_err(&pdev->dev, "failed to register LED %d\n", | |
159 | led_dat->id); | |
160 | goto err; | |
161 | } | |
162 | ||
163 | ret = adp5520_led_setup(led_dat); | |
164 | if (ret) { | |
165 | dev_err(&pdev->dev, "failed to write\n"); | |
166 | i++; | |
167 | goto err; | |
168 | } | |
169 | } | |
170 | ||
171 | platform_set_drvdata(pdev, led); | |
172 | return 0; | |
173 | ||
174 | err: | |
175 | if (i > 0) { | |
176 | for (i = i - 1; i >= 0; i--) { | |
177 | led_classdev_unregister(&led[i].cdev); | |
178 | cancel_work_sync(&led[i].work); | |
179 | } | |
180 | } | |
181 | ||
182 | err_free: | |
183 | kfree(led); | |
184 | return ret; | |
185 | } | |
186 | ||
187 | static int __devexit adp5520_led_remove(struct platform_device *pdev) | |
188 | { | |
189 | struct adp5520_leds_platform_data *pdata = pdev->dev.platform_data; | |
190 | struct adp5520_led *led; | |
191 | int i; | |
192 | ||
193 | led = platform_get_drvdata(pdev); | |
194 | ||
195 | adp5520_clr_bits(led->master, ADP5520_LED_CONTROL, | |
196 | ADP5520_LED1_EN | ADP5520_LED2_EN | ADP5520_LED3_EN); | |
197 | ||
198 | for (i = 0; i < pdata->num_leds; i++) { | |
199 | led_classdev_unregister(&led[i].cdev); | |
200 | cancel_work_sync(&led[i].work); | |
201 | } | |
202 | ||
203 | kfree(led); | |
204 | return 0; | |
205 | } | |
206 | ||
207 | static struct platform_driver adp5520_led_driver = { | |
208 | .driver = { | |
209 | .name = "adp5520-led", | |
210 | .owner = THIS_MODULE, | |
211 | }, | |
212 | .probe = adp5520_led_probe, | |
213 | .remove = __devexit_p(adp5520_led_remove), | |
214 | }; | |
215 | ||
216 | static int __init adp5520_led_init(void) | |
217 | { | |
218 | return platform_driver_register(&adp5520_led_driver); | |
219 | } | |
220 | module_init(adp5520_led_init); | |
221 | ||
222 | static void __exit adp5520_led_exit(void) | |
223 | { | |
224 | platform_driver_unregister(&adp5520_led_driver); | |
225 | } | |
226 | module_exit(adp5520_led_exit); | |
227 | ||
228 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); | |
229 | MODULE_DESCRIPTION("LEDS ADP5520(01) Driver"); | |
230 | MODULE_LICENSE("GPL"); | |
231 | MODULE_ALIAS("platform:adp5520-led"); |