| 1 | /* |
| 2 | * EASY98000 CPLD LED driver |
| 3 | * |
| 4 | * Copyright (C) 2010 Ralph Hempel <ralph.hempel@lantiq.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License version 2 as published |
| 8 | * by the Free Software Foundation. |
| 9 | * |
| 10 | */ |
| 11 | |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/version.h> |
| 14 | #include <linux/types.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/platform_device.h> |
| 17 | #include <linux/errno.h> |
| 18 | #include <linux/leds.h> |
| 19 | #include <linux/slab.h> |
| 20 | |
| 21 | #include "dev-leds-easy98000-cpld.h" |
| 22 | |
| 23 | const char *led_name[8] = { |
| 24 | "ge0_act", |
| 25 | "ge0_link", |
| 26 | "ge1_act", |
| 27 | "ge1_link", |
| 28 | "fe2_act", |
| 29 | "fe2_link", |
| 30 | "fe3_act", |
| 31 | "fe3_link" |
| 32 | }; |
| 33 | |
| 34 | #define cpld_base7 ((u16 *)(KSEG1 | 0x17c0000c)) |
| 35 | #define cpld_base8 ((u16 *)(KSEG1 | 0x17c00012)) |
| 36 | |
| 37 | #define ltq_r16(reg) __raw_readw(reg) |
| 38 | #define ltq_w16(val, reg) __raw_writew(val, reg) |
| 39 | |
| 40 | struct cpld_led_dev { |
| 41 | struct led_classdev cdev; |
| 42 | u8 mask; |
| 43 | u16 *base; |
| 44 | }; |
| 45 | |
| 46 | struct cpld_led_drvdata { |
| 47 | struct cpld_led_dev *led_devs; |
| 48 | int num_leds; |
| 49 | }; |
| 50 | |
| 51 | void led_set(u8 mask, u16 *base) |
| 52 | { |
| 53 | ltq_w16(ltq_r16(base) | mask, base); |
| 54 | } |
| 55 | |
| 56 | void led_clear(u8 mask, u16 *base) |
| 57 | { |
| 58 | ltq_w16(ltq_r16(base) & (~mask), base); |
| 59 | } |
| 60 | |
| 61 | void led_blink_clear(u8 mask, u16 *base) |
| 62 | { |
| 63 | led_clear(mask, base); |
| 64 | } |
| 65 | |
| 66 | static void led_brightness(struct led_classdev *led_cdev, |
| 67 | enum led_brightness value) |
| 68 | { |
| 69 | struct cpld_led_dev *led_dev = |
| 70 | container_of(led_cdev, struct cpld_led_dev, cdev); |
| 71 | |
| 72 | if (value) |
| 73 | led_set(led_dev->mask, led_dev->base); |
| 74 | else |
| 75 | led_clear(led_dev->mask, led_dev->base); |
| 76 | } |
| 77 | |
| 78 | static int led_probe(struct platform_device *pdev) |
| 79 | { |
| 80 | int i; |
| 81 | char name[32]; |
| 82 | struct cpld_led_drvdata *drvdata; |
| 83 | int ret = 0; |
| 84 | |
| 85 | drvdata = kzalloc(sizeof(struct cpld_led_drvdata) + |
| 86 | sizeof(struct cpld_led_dev) * MAX_LED, |
| 87 | GFP_KERNEL); |
| 88 | if (!drvdata) |
| 89 | return -ENOMEM; |
| 90 | |
| 91 | drvdata->led_devs = (struct cpld_led_dev *) &drvdata[1]; |
| 92 | |
| 93 | for (i = 0; i < MAX_LED; i++) { |
| 94 | struct cpld_led_dev *led_dev = &drvdata->led_devs[i]; |
| 95 | led_dev->cdev.brightness_set = led_brightness; |
| 96 | led_dev->cdev.default_trigger = NULL; |
| 97 | led_dev->mask = 1 << (i % 8); |
| 98 | if(i < 8) { |
| 99 | sprintf(name, "easy98000-cpld:%s", led_name[i]); |
| 100 | led_dev->base = cpld_base8; |
| 101 | } else { |
| 102 | sprintf(name, "easy98000-cpld:red:%d", i-8); |
| 103 | led_dev->base = cpld_base7; |
| 104 | } |
| 105 | led_dev->cdev.name = name; |
| 106 | ret = led_classdev_register(&pdev->dev, &led_dev->cdev); |
| 107 | if (ret) |
| 108 | goto err; |
| 109 | } |
| 110 | platform_set_drvdata(pdev, drvdata); |
| 111 | return 0; |
| 112 | |
| 113 | err: |
| 114 | printk("led_probe: 3\n"); |
| 115 | for (i = i - 1; i >= 0; i--) |
| 116 | led_classdev_unregister(&drvdata->led_devs[i].cdev); |
| 117 | |
| 118 | kfree(drvdata); |
| 119 | return ret; |
| 120 | } |
| 121 | |
| 122 | static int led_remove(struct platform_device *pdev) |
| 123 | { |
| 124 | int i; |
| 125 | struct cpld_led_drvdata *drvdata = platform_get_drvdata(pdev); |
| 126 | for (i = 0; i < MAX_LED; i++) |
| 127 | led_classdev_unregister(&drvdata->led_devs[i].cdev); |
| 128 | kfree(drvdata); |
| 129 | return 0; |
| 130 | } |
| 131 | |
| 132 | static struct platform_driver led_driver = { |
| 133 | .probe = led_probe, |
| 134 | .remove = __devexit_p(led_remove), |
| 135 | .driver = { |
| 136 | .name = LED_NAME, |
| 137 | .owner = THIS_MODULE, |
| 138 | }, |
| 139 | }; |
| 140 | |
| 141 | int __init easy98000_cpld_led_init(void) |
| 142 | { |
| 143 | pr_info(LED_DESC ", Version " LED_VERSION |
| 144 | " (c) Copyright 2011, Lantiq Deutschland GmbH\n"); |
| 145 | return platform_driver_register(&led_driver); |
| 146 | } |
| 147 | |
| 148 | void __exit easy98000_cpld_led_exit(void) |
| 149 | { |
| 150 | platform_driver_unregister(&led_driver); |
| 151 | } |
| 152 | |
| 153 | module_init(easy98000_cpld_led_init); |
| 154 | module_exit(easy98000_cpld_led_exit); |
| 155 | |
| 156 | MODULE_DESCRIPTION(LED_NAME); |
| 157 | MODULE_DESCRIPTION(LED_DESC); |
| 158 | MODULE_AUTHOR("Ralph Hempel <ralph.hempel@lantiq.com>"); |
| 159 | MODULE_LICENSE("GPL v2"); |
| 160 | |
| 161 | |
