| 1 | /* |
| 2 | * LED driver for the RouterBOARD 750 |
| 3 | * |
| 4 | * Copyright (C) 2010 Gabor Juhos <juhosg@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 version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | */ |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/platform_device.h> |
| 15 | #include <linux/leds.h> |
| 16 | #include <linux/slab.h> |
| 17 | |
| 18 | #include <asm/mach-ath79/mach-rb750.h> |
| 19 | |
| 20 | #define DRV_NAME "leds-rb750" |
| 21 | |
| 22 | struct rb750_led_dev { |
| 23 | struct led_classdev cdev; |
| 24 | u32 mask; |
| 25 | int active_low; |
| 26 | void (*latch_change)(u32 clear, u32 set); |
| 27 | }; |
| 28 | |
| 29 | struct rb750_led_drvdata { |
| 30 | struct rb750_led_dev *led_devs; |
| 31 | int num_leds; |
| 32 | }; |
| 33 | |
| 34 | static inline struct rb750_led_dev *to_rbled(struct led_classdev *led_cdev) |
| 35 | { |
| 36 | return (struct rb750_led_dev *)container_of(led_cdev, |
| 37 | struct rb750_led_dev, cdev); |
| 38 | } |
| 39 | |
| 40 | static void rb750_led_brightness_set(struct led_classdev *led_cdev, |
| 41 | enum led_brightness value) |
| 42 | { |
| 43 | struct rb750_led_dev *rbled = to_rbled(led_cdev); |
| 44 | int level; |
| 45 | |
| 46 | level = (value == LED_OFF) ? 0 : 1; |
| 47 | level ^= rbled->active_low; |
| 48 | |
| 49 | if (level) |
| 50 | rbled->latch_change(0, rbled->mask); |
| 51 | else |
| 52 | rbled->latch_change(rbled->mask, 0); |
| 53 | } |
| 54 | |
| 55 | static int __devinit rb750_led_probe(struct platform_device *pdev) |
| 56 | { |
| 57 | struct rb750_led_platform_data *pdata; |
| 58 | struct rb750_led_drvdata *drvdata; |
| 59 | int ret = 0; |
| 60 | int i; |
| 61 | |
| 62 | pdata = pdev->dev.platform_data; |
| 63 | if (!pdata) |
| 64 | return -EINVAL; |
| 65 | |
| 66 | drvdata = kzalloc(sizeof(struct rb750_led_drvdata) + |
| 67 | sizeof(struct rb750_led_dev) * pdata->num_leds, |
| 68 | GFP_KERNEL); |
| 69 | if (!drvdata) |
| 70 | return -ENOMEM; |
| 71 | |
| 72 | drvdata->num_leds = pdata->num_leds; |
| 73 | drvdata->led_devs = (struct rb750_led_dev *) &drvdata[1]; |
| 74 | |
| 75 | for (i = 0; i < drvdata->num_leds; i++) { |
| 76 | struct rb750_led_dev *rbled = &drvdata->led_devs[i]; |
| 77 | struct rb750_led_data *led_data = &pdata->leds[i]; |
| 78 | |
| 79 | rbled->cdev.name = led_data->name; |
| 80 | rbled->cdev.default_trigger = led_data->default_trigger; |
| 81 | rbled->cdev.brightness_set = rb750_led_brightness_set; |
| 82 | rbled->cdev.brightness = LED_OFF; |
| 83 | |
| 84 | rbled->mask = led_data->mask; |
| 85 | rbled->active_low = !!led_data->active_low; |
| 86 | rbled->latch_change = pdata->latch_change; |
| 87 | |
| 88 | ret = led_classdev_register(&pdev->dev, &rbled->cdev); |
| 89 | if (ret) |
| 90 | goto err; |
| 91 | } |
| 92 | |
| 93 | platform_set_drvdata(pdev, drvdata); |
| 94 | return 0; |
| 95 | |
| 96 | err: |
| 97 | for (i = i - 1; i >= 0; i--) |
| 98 | led_classdev_unregister(&drvdata->led_devs[i].cdev); |
| 99 | |
| 100 | kfree(drvdata); |
| 101 | return ret; |
| 102 | } |
| 103 | |
| 104 | static int __devexit rb750_led_remove(struct platform_device *pdev) |
| 105 | { |
| 106 | struct rb750_led_drvdata *drvdata; |
| 107 | int i; |
| 108 | |
| 109 | drvdata = platform_get_drvdata(pdev); |
| 110 | for (i = 0; i < drvdata->num_leds; i++) |
| 111 | led_classdev_unregister(&drvdata->led_devs[i].cdev); |
| 112 | |
| 113 | kfree(drvdata); |
| 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | static struct platform_driver rb750_led_driver = { |
| 118 | .probe = rb750_led_probe, |
| 119 | .remove = __devexit_p(rb750_led_remove), |
| 120 | .driver = { |
| 121 | .name = DRV_NAME, |
| 122 | .owner = THIS_MODULE, |
| 123 | }, |
| 124 | }; |
| 125 | |
| 126 | MODULE_ALIAS("platform:leds-rb750"); |
| 127 | |
| 128 | static int __init rb750_led_init(void) |
| 129 | { |
| 130 | return platform_driver_register(&rb750_led_driver); |
| 131 | } |
| 132 | |
| 133 | static void __exit rb750_led_exit(void) |
| 134 | { |
| 135 | platform_driver_unregister(&rb750_led_driver); |
| 136 | } |
| 137 | |
| 138 | module_init(rb750_led_init); |
| 139 | module_exit(rb750_led_exit); |
| 140 | |
| 141 | MODULE_DESCRIPTION(DRV_NAME); |
| 142 | MODULE_DESCRIPTION("LED driver for the RouterBOARD 750"); |
| 143 | MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>"); |
| 144 | MODULE_LICENSE("GPL v2"); |
| 145 | |
