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1 | /* drivers/leds/leds-s3c24xx.c |
2 | * | |
3 | * (c) 2006 Simtec Electronics | |
4 | * http://armlinux.simtec.co.uk/ | |
5 | * Ben Dooks <ben@simtec.co.uk> | |
6 | * | |
7 | * S3C24XX - LEDs GPIO driver | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #include <linux/config.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/leds.h> | |
19 | ||
20 | #include <asm/arch/hardware.h> | |
21 | #include <asm/arch/regs-gpio.h> | |
22 | #include <asm/arch/leds-gpio.h> | |
23 | ||
24 | /* our context */ | |
25 | ||
26 | struct s3c24xx_gpio_led { | |
27 | struct led_classdev cdev; | |
28 | struct s3c24xx_led_platdata *pdata; | |
29 | }; | |
30 | ||
31 | static inline struct s3c24xx_gpio_led *pdev_to_gpio(struct platform_device *dev) | |
32 | { | |
33 | return platform_get_drvdata(dev); | |
34 | } | |
35 | ||
36 | static inline struct s3c24xx_gpio_led *to_gpio(struct led_classdev *led_cdev) | |
37 | { | |
38 | return container_of(led_cdev, struct s3c24xx_gpio_led, cdev); | |
39 | } | |
40 | ||
41 | static void s3c24xx_led_set(struct led_classdev *led_cdev, | |
42 | enum led_brightness value) | |
43 | { | |
44 | struct s3c24xx_gpio_led *led = to_gpio(led_cdev); | |
45 | struct s3c24xx_led_platdata *pd = led->pdata; | |
46 | ||
47 | /* there will be a sort delay between setting the output and | |
48 | * going from output to input when using tristate. */ | |
49 | ||
50 | s3c2410_gpio_setpin(pd->gpio, (value ? 1 : 0) ^ | |
51 | (pd->flags & S3C24XX_LEDF_ACTLOW)); | |
52 | ||
53 | if (pd->flags & S3C24XX_LEDF_TRISTATE) | |
54 | s3c2410_gpio_cfgpin(pd->gpio, | |
55 | value ? S3C2410_GPIO_OUTPUT : S3C2410_GPIO_INPUT); | |
56 | ||
57 | } | |
58 | ||
59 | static int s3c24xx_led_remove(struct platform_device *dev) | |
60 | { | |
61 | struct s3c24xx_gpio_led *led = pdev_to_gpio(dev); | |
62 | ||
63 | led_classdev_unregister(&led->cdev); | |
64 | kfree(led); | |
65 | ||
66 | return 0; | |
67 | } | |
68 | ||
69 | static int s3c24xx_led_probe(struct platform_device *dev) | |
70 | { | |
71 | struct s3c24xx_led_platdata *pdata = dev->dev.platform_data; | |
72 | struct s3c24xx_gpio_led *led; | |
73 | int ret; | |
74 | ||
75 | led = kzalloc(sizeof(struct s3c24xx_gpio_led), GFP_KERNEL); | |
76 | if (led == NULL) { | |
77 | dev_err(&dev->dev, "No memory for device\n"); | |
78 | return -ENOMEM; | |
79 | } | |
80 | ||
81 | platform_set_drvdata(dev, led); | |
82 | ||
83 | led->cdev.brightness_set = s3c24xx_led_set; | |
84 | led->cdev.default_trigger = pdata->def_trigger; | |
85 | led->cdev.name = pdata->name; | |
86 | ||
87 | led->pdata = pdata; | |
88 | ||
89 | /* no point in having a pull-up if we are always driving */ | |
90 | ||
91 | if (pdata->flags & S3C24XX_LEDF_TRISTATE) { | |
92 | s3c2410_gpio_setpin(pdata->gpio, 0); | |
93 | s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_INPUT); | |
94 | } else { | |
95 | s3c2410_gpio_pullup(pdata->gpio, 0); | |
96 | s3c2410_gpio_setpin(pdata->gpio, 0); | |
97 | s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_OUTPUT); | |
98 | } | |
99 | ||
100 | /* register our new led device */ | |
101 | ||
102 | ret = led_classdev_register(&dev->dev, &led->cdev); | |
103 | if (ret < 0) { | |
104 | dev_err(&dev->dev, "led_classdev_register failed\n"); | |
105 | goto exit_err1; | |
106 | } | |
107 | ||
108 | return 0; | |
109 | ||
110 | exit_err1: | |
111 | kfree(led); | |
112 | return ret; | |
113 | } | |
114 | ||
115 | ||
116 | #ifdef CONFIG_PM | |
117 | static int s3c24xx_led_suspend(struct platform_device *dev, pm_message_t state) | |
118 | { | |
119 | struct s3c24xx_gpio_led *led = pdev_to_gpio(dev); | |
120 | ||
121 | led_classdev_suspend(&led->cdev); | |
122 | return 0; | |
123 | } | |
124 | ||
125 | static int s3c24xx_led_resume(struct platform_device *dev) | |
126 | { | |
127 | struct s3c24xx_gpio_led *led = pdev_to_gpio(dev); | |
128 | ||
129 | led_classdev_resume(&led->cdev); | |
130 | return 0; | |
131 | } | |
132 | #else | |
133 | #define s3c24xx_led_suspend NULL | |
134 | #define s3c24xx_led_resume NULL | |
135 | #endif | |
136 | ||
137 | static struct platform_driver s3c24xx_led_driver = { | |
138 | .probe = s3c24xx_led_probe, | |
139 | .remove = s3c24xx_led_remove, | |
140 | .suspend = s3c24xx_led_suspend, | |
141 | .resume = s3c24xx_led_resume, | |
142 | .driver = { | |
143 | .name = "s3c24xx_led", | |
144 | .owner = THIS_MODULE, | |
145 | }, | |
146 | }; | |
147 | ||
148 | static int __init s3c24xx_led_init(void) | |
149 | { | |
150 | return platform_driver_register(&s3c24xx_led_driver); | |
151 | } | |
152 | ||
153 | static void __exit s3c24xx_led_exit(void) | |
154 | { | |
155 | platform_driver_unregister(&s3c24xx_led_driver); | |
156 | } | |
157 | ||
158 | module_init(s3c24xx_led_init); | |
159 | module_exit(s3c24xx_led_exit); | |
160 | ||
161 | MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); | |
162 | MODULE_DESCRIPTION("S3C24XX LED driver"); | |
163 | MODULE_LICENSE("GPL"); |