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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/kernel.h>
15#include <linux/init.h>
16#include <linux/platform_device.h>
17#include <linux/leds.h>
18#include <linux/gpio.h>
19#include <linux/slab.h>
20#include <linux/module.h>
21
22#include <mach/hardware.h>
23#include <mach/regs-gpio.h>
24#include <mach/leds-gpio.h>
25
26/* our context */
27
28struct s3c24xx_gpio_led {
29 struct led_classdev cdev;
30 struct s3c24xx_led_platdata *pdata;
31};
32
33static inline struct s3c24xx_gpio_led *pdev_to_gpio(struct platform_device *dev)
34{
35 return platform_get_drvdata(dev);
36}
37
38static inline struct s3c24xx_gpio_led *to_gpio(struct led_classdev *led_cdev)
39{
40 return container_of(led_cdev, struct s3c24xx_gpio_led, cdev);
41}
42
43static void s3c24xx_led_set(struct led_classdev *led_cdev,
44 enum led_brightness value)
45{
46 struct s3c24xx_gpio_led *led = to_gpio(led_cdev);
47 struct s3c24xx_led_platdata *pd = led->pdata;
48
49 /* there will be a short delay between setting the output and
50 * going from output to input when using tristate. */
51
52 s3c2410_gpio_setpin(pd->gpio, (value ? 1 : 0) ^
53 (pd->flags & S3C24XX_LEDF_ACTLOW));
54
55 if (pd->flags & S3C24XX_LEDF_TRISTATE)
56 s3c2410_gpio_cfgpin(pd->gpio,
57 value ? S3C2410_GPIO_OUTPUT : S3C2410_GPIO_INPUT);
58
59}
60
61static int s3c24xx_led_remove(struct platform_device *dev)
62{
63 struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);
64
65 led_classdev_unregister(&led->cdev);
66 kfree(led);
67
68 return 0;
69}
70
71static int s3c24xx_led_probe(struct platform_device *dev)
72{
73 struct s3c24xx_led_platdata *pdata = dev->dev.platform_data;
74 struct s3c24xx_gpio_led *led;
75 int ret;
76
77 led = kzalloc(sizeof(struct s3c24xx_gpio_led), GFP_KERNEL);
78 if (led == NULL) {
79 dev_err(&dev->dev, "No memory for device\n");
80 return -ENOMEM;
81 }
82
83 platform_set_drvdata(dev, led);
84
85 led->cdev.brightness_set = s3c24xx_led_set;
86 led->cdev.default_trigger = pdata->def_trigger;
87 led->cdev.name = pdata->name;
88 led->cdev.flags |= LED_CORE_SUSPENDRESUME;
89
90 led->pdata = pdata;
91
92 /* no point in having a pull-up if we are always driving */
93
94 if (pdata->flags & S3C24XX_LEDF_TRISTATE) {
95 s3c2410_gpio_setpin(pdata->gpio, 0);
96 s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_INPUT);
97 } else {
98 s3c2410_gpio_pullup(pdata->gpio, 0);
99 s3c2410_gpio_setpin(pdata->gpio, 0);
100 s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_OUTPUT);
101 }
102
103 /* register our new led device */
104
105 ret = led_classdev_register(&dev->dev, &led->cdev);
106 if (ret < 0) {
107 dev_err(&dev->dev, "led_classdev_register failed\n");
108 kfree(led);
109 return ret;
110 }
111
112 return 0;
113}
114
115static struct platform_driver s3c24xx_led_driver = {
116 .probe = s3c24xx_led_probe,
117 .remove = s3c24xx_led_remove,
118 .driver = {
119 .name = "s3c24xx_led",
120 .owner = THIS_MODULE,
121 },
122};
123
124module_platform_driver(s3c24xx_led_driver);
125
126MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
127MODULE_DESCRIPTION("S3C24XX LED driver");
128MODULE_LICENSE("GPL");
129MODULE_ALIAS("platform:s3c24xx_led");
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/kernel.h>
15#include <linux/platform_device.h>
16#include <linux/leds.h>
17#include <linux/gpio.h>
18#include <linux/slab.h>
19#include <linux/module.h>
20#include <linux/platform_data/leds-s3c24xx.h>
21
22#include <mach/regs-gpio.h>
23#include <plat/gpio-cfg.h>
24
25/* our context */
26
27struct s3c24xx_gpio_led {
28 struct led_classdev cdev;
29 struct s3c24xx_led_platdata *pdata;
30};
31
32static inline struct s3c24xx_gpio_led *to_gpio(struct led_classdev *led_cdev)
33{
34 return container_of(led_cdev, struct s3c24xx_gpio_led, cdev);
35}
36
37static void s3c24xx_led_set(struct led_classdev *led_cdev,
38 enum led_brightness value)
39{
40 struct s3c24xx_gpio_led *led = to_gpio(led_cdev);
41 struct s3c24xx_led_platdata *pd = led->pdata;
42 int state = (value ? 1 : 0) ^ (pd->flags & S3C24XX_LEDF_ACTLOW);
43
44 /* there will be a short delay between setting the output and
45 * going from output to input when using tristate. */
46
47 gpio_set_value(pd->gpio, state);
48
49 if (pd->flags & S3C24XX_LEDF_TRISTATE) {
50 if (value)
51 gpio_direction_output(pd->gpio, state);
52 else
53 gpio_direction_input(pd->gpio);
54 }
55}
56
57static int s3c24xx_led_probe(struct platform_device *dev)
58{
59 struct s3c24xx_led_platdata *pdata = dev_get_platdata(&dev->dev);
60 struct s3c24xx_gpio_led *led;
61 int ret;
62
63 led = devm_kzalloc(&dev->dev, sizeof(struct s3c24xx_gpio_led),
64 GFP_KERNEL);
65 if (!led)
66 return -ENOMEM;
67
68 led->cdev.brightness_set = s3c24xx_led_set;
69 led->cdev.default_trigger = pdata->def_trigger;
70 led->cdev.name = pdata->name;
71 led->cdev.flags |= LED_CORE_SUSPENDRESUME;
72
73 led->pdata = pdata;
74
75 ret = devm_gpio_request(&dev->dev, pdata->gpio, "S3C24XX_LED");
76 if (ret < 0)
77 return ret;
78
79 /* no point in having a pull-up if we are always driving */
80
81 s3c_gpio_setpull(pdata->gpio, S3C_GPIO_PULL_NONE);
82
83 if (pdata->flags & S3C24XX_LEDF_TRISTATE)
84 gpio_direction_input(pdata->gpio);
85 else
86 gpio_direction_output(pdata->gpio,
87 pdata->flags & S3C24XX_LEDF_ACTLOW ? 1 : 0);
88
89 /* register our new led device */
90
91 ret = devm_led_classdev_register(&dev->dev, &led->cdev);
92 if (ret < 0)
93 dev_err(&dev->dev, "led_classdev_register failed\n");
94
95 return ret;
96}
97
98static struct platform_driver s3c24xx_led_driver = {
99 .probe = s3c24xx_led_probe,
100 .driver = {
101 .name = "s3c24xx_led",
102 },
103};
104
105module_platform_driver(s3c24xx_led_driver);
106
107MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
108MODULE_DESCRIPTION("S3C24XX LED driver");
109MODULE_LICENSE("GPL");
110MODULE_ALIAS("platform:s3c24xx_led");