target/linux/ar7/files/drivers/leds/leds-ar7.c

   1 /*
   2  * linux/drivers/leds/leds-ar7.c
   3  *
   4  * Copyright (C) 2007 OpenWrt.org
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  */
  20
  21
  22 #include <linux/kernel.h>
  23 #include <linux/init.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/leds.h>
  26 #include <linux/err.h>
  27 #include <linux/io.h>
  28 #include <gpio.h>
  29
  30 #define DRVNAME "ar7-leds"
  31 #define LONGNAME "TI AR7 LEDs driver"
  32 #define AR7_GPIO_BIT_STATUS_LED 8
  33
  34 MODULE_AUTHOR("Nicolas Thill <nico@openwrt.org>");
  35 MODULE_DESCRIPTION(LONGNAME);
  36 MODULE_LICENSE("GPL");
  37
  38 static void ar7_status_led_set(struct led_classdev *pled,
  39                 enum led_brightness value)
  40 {
  41         gpio_set_value(AR7_GPIO_BIT_STATUS_LED, value ? 0 : 1);
  42 }
  43
  44 static struct led_classdev ar7_status_led = {
  45         .name           = "ar7:status",
  46         .brightness_set = ar7_status_led_set,
  47 };
  48
  49 #ifdef CONFIG_PM
  50 static int ar7_leds_suspend(struct platform_device *dev,
  51                 pm_message_t state)
  52 {
  53         led_classdev_suspend(&ar7_status_led);
  54         return 0;
  55 }
  56
  57 static int ar7_leds_resume(struct platform_device *dev)
  58 {
  59         led_classdev_resume(&ar7_status_led);
  60         return 0;
  61 }
  62 #else /* CONFIG_PM */
  63 #define ar7_leds_suspend NULL
  64 #define ar7_leds_resume NULL
  65 #endif /* CONFIG_PM */
  66
  67 static int ar7_leds_probe(struct platform_device *pdev)
  68 {
  69         int rc;
  70
  71         rc = led_classdev_register(&pdev->dev, &ar7_status_led);
  72         if (rc < 0)
  73                 goto out;
  74
  75         ar7_gpio_enable(AR7_GPIO_BIT_STATUS_LED);
  76         gpio_direction_output(AR7_GPIO_BIT_STATUS_LED, 0);
  77
  78 out:
  79         return rc;
  80 }
  81
  82 static int ar7_leds_remove(struct platform_device *pdev)
  83 {
  84         led_classdev_unregister(&ar7_status_led);
  85
  86         return 0;
  87 }
  88
  89 static struct platform_device *ar7_leds_device;
  90
  91 static struct platform_driver ar7_leds_driver = {
  92         .probe          = ar7_leds_probe,
  93         .remove         = ar7_leds_remove,
  94         .suspend        = ar7_leds_suspend,
  95         .resume         = ar7_leds_resume,
  96         .driver         = {
  97                 .name           = DRVNAME,
  98         },
  99 };
 100
 101 static int __init ar7_leds_init(void)
 102 {
 103         int rc;
 104
 105         ar7_leds_device = platform_device_alloc(DRVNAME, -1);
 106         if (!ar7_leds_device)
 107                 return -ENOMEM;
 108
 109         rc = platform_device_add(ar7_leds_device);
 110         if (rc < 0)
 111                 goto out_put;
 112
 113         rc = platform_driver_register(&ar7_leds_driver);
 114         if (rc < 0)
 115                 goto out_put;
 116
 117         goto out;
 118
 119 out_put:
 120         platform_device_put(ar7_leds_device);
 121 out:
 122         return rc;
 123 }
 124
 125 static void __exit ar7_leds_exit(void)
 126 {
 127         platform_driver_unregister(&ar7_leds_driver);
 128         platform_device_unregister(ar7_leds_device);
 129 }
 130
 131 module_init(ar7_leds_init);
 132 module_exit(ar7_leds_exit);