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| 1 | /* |
| 2 | * Bachmann ot200 leds driver. |
| 3 | * |
| 4 | * Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> |
| 5 | * Christian Gmeiner <christian.gmeiner@gmail.com> |
| 6 | * |
| 7 | * License: GPL as published by the FSF. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/platform_device.h> |
| 13 | #include <linux/slab.h> |
| 14 | #include <linux/leds.h> |
| 15 | #include <linux/io.h> |
| 16 | #include <linux/module.h> |
| 17 | |
| 18 | |
| 19 | struct ot200_led { |
| 20 | struct led_classdev cdev; |
| 21 | const char *name; |
| 22 | unsigned long port; |
| 23 | u8 mask; |
| 24 | }; |
| 25 | |
| 26 | /* |
| 27 | * The device has three leds on the back panel (led_err, led_init and led_run) |
| 28 | * and can handle up to seven leds on the front panel. |
| 29 | */ |
| 30 | |
| 31 | static struct ot200_led leds[] = { |
| 32 | { |
| 33 | .name = "led_run", |
| 34 | .port = 0x5a, |
| 35 | .mask = BIT(0), |
| 36 | }, |
| 37 | { |
| 38 | .name = "led_init", |
| 39 | .port = 0x5a, |
| 40 | .mask = BIT(1), |
| 41 | }, |
| 42 | { |
| 43 | .name = "led_err", |
| 44 | .port = 0x5a, |
| 45 | .mask = BIT(2), |
| 46 | }, |
| 47 | { |
| 48 | .name = "led_1", |
| 49 | .port = 0x49, |
| 50 | .mask = BIT(7), |
| 51 | }, |
| 52 | { |
| 53 | .name = "led_2", |
| 54 | .port = 0x49, |
| 55 | .mask = BIT(6), |
| 56 | }, |
| 57 | { |
| 58 | .name = "led_3", |
| 59 | .port = 0x49, |
| 60 | .mask = BIT(5), |
| 61 | }, |
| 62 | { |
| 63 | .name = "led_4", |
| 64 | .port = 0x49, |
| 65 | .mask = BIT(4), |
| 66 | }, |
| 67 | { |
| 68 | .name = "led_5", |
| 69 | .port = 0x49, |
| 70 | .mask = BIT(3), |
| 71 | }, |
| 72 | { |
| 73 | .name = "led_6", |
| 74 | .port = 0x49, |
| 75 | .mask = BIT(2), |
| 76 | }, |
| 77 | { |
| 78 | .name = "led_7", |
| 79 | .port = 0x49, |
| 80 | .mask = BIT(1), |
| 81 | } |
| 82 | }; |
| 83 | |
| 84 | static DEFINE_SPINLOCK(value_lock); |
| 85 | |
| 86 | /* |
| 87 | * we need to store the current led states, as it is not |
| 88 | * possible to read the current led state via inb(). |
| 89 | */ |
| 90 | static u8 leds_back; |
| 91 | static u8 leds_front; |
| 92 | |
| 93 | static void ot200_led_brightness_set(struct led_classdev *led_cdev, |
| 94 | enum led_brightness value) |
| 95 | { |
| 96 | struct ot200_led *led = container_of(led_cdev, struct ot200_led, cdev); |
| 97 | u8 *val; |
| 98 | unsigned long flags; |
| 99 | |
| 100 | spin_lock_irqsave(&value_lock, flags); |
| 101 | |
| 102 | if (led->port == 0x49) |
| 103 | val = &leds_front; |
| 104 | else if (led->port == 0x5a) |
| 105 | val = &leds_back; |
| 106 | else |
| 107 | BUG(); |
| 108 | |
| 109 | if (value == LED_OFF) |
| 110 | *val &= ~led->mask; |
| 111 | else |
| 112 | *val |= led->mask; |
| 113 | |
| 114 | outb(*val, led->port); |
| 115 | spin_unlock_irqrestore(&value_lock, flags); |
| 116 | } |
| 117 | |
| 118 | static int ot200_led_probe(struct platform_device *pdev) |
| 119 | { |
| 120 | int i; |
| 121 | int ret; |
| 122 | |
| 123 | for (i = 0; i < ARRAY_SIZE(leds); i++) { |
| 124 | |
| 125 | leds[i].cdev.name = leds[i].name; |
| 126 | leds[i].cdev.brightness_set = ot200_led_brightness_set; |
| 127 | |
| 128 | ret = led_classdev_register(&pdev->dev, &leds[i].cdev); |
| 129 | if (ret < 0) |
| 130 | goto err; |
| 131 | } |
| 132 | |
| 133 | leds_front = 0; /* turn off all front leds */ |
| 134 | leds_back = BIT(1); /* turn on init led */ |
| 135 | outb(leds_front, 0x49); |
| 136 | outb(leds_back, 0x5a); |
| 137 | |
| 138 | return 0; |
| 139 | |
| 140 | err: |
| 141 | for (i = i - 1; i >= 0; i--) |
| 142 | led_classdev_unregister(&leds[i].cdev); |
| 143 | |
| 144 | return ret; |
| 145 | } |
| 146 | |
| 147 | static int ot200_led_remove(struct platform_device *pdev) |
| 148 | { |
| 149 | int i; |
| 150 | |
| 151 | for (i = 0; i < ARRAY_SIZE(leds); i++) |
| 152 | led_classdev_unregister(&leds[i].cdev); |
| 153 | |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | static struct platform_driver ot200_led_driver = { |
| 158 | .probe = ot200_led_probe, |
| 159 | .remove = ot200_led_remove, |
| 160 | .driver = { |
| 161 | .name = "leds-ot200", |
| 162 | .owner = THIS_MODULE, |
| 163 | }, |
| 164 | }; |
| 165 | |
| 166 | module_platform_driver(ot200_led_driver); |
| 167 | |
| 168 | MODULE_AUTHOR("Sebastian A. Siewior <bigeasy@linutronix.de>"); |
| 169 | MODULE_DESCRIPTION("ot200 LED driver"); |
| 170 | MODULE_LICENSE("GPL"); |
| 171 | MODULE_ALIAS("platform:leds-ot200"); |
| 172 |
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