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