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8338eab5 HCO |
1 | /* |
2 | * Copyright (C) 2016 National Instruments Corp. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | */ | |
14 | ||
15 | #include <linux/acpi.h> | |
16 | #include <linux/leds.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/spinlock.h> | |
20 | ||
21 | #define NIC78BX_USER1_LED_MASK 0x3 | |
22 | #define NIC78BX_USER1_GREEN_LED BIT(0) | |
23 | #define NIC78BX_USER1_YELLOW_LED BIT(1) | |
24 | ||
25 | #define NIC78BX_USER2_LED_MASK 0xC | |
26 | #define NIC78BX_USER2_GREEN_LED BIT(2) | |
27 | #define NIC78BX_USER2_YELLOW_LED BIT(3) | |
28 | ||
29 | #define NIC78BX_LOCK_REG_OFFSET 1 | |
30 | #define NIC78BX_LOCK_VALUE 0xA5 | |
31 | #define NIC78BX_UNLOCK_VALUE 0x5A | |
32 | ||
33 | #define NIC78BX_USER_LED_IO_SIZE 2 | |
34 | ||
35 | struct nic78bx_led_data { | |
36 | u16 io_base; | |
37 | spinlock_t lock; | |
38 | struct platform_device *pdev; | |
39 | }; | |
40 | ||
41 | struct nic78bx_led { | |
42 | u8 bit; | |
43 | u8 mask; | |
44 | struct nic78bx_led_data *data; | |
45 | struct led_classdev cdev; | |
46 | }; | |
47 | ||
48 | static inline struct nic78bx_led *to_nic78bx_led(struct led_classdev *cdev) | |
49 | { | |
50 | return container_of(cdev, struct nic78bx_led, cdev); | |
51 | } | |
52 | ||
53 | static void nic78bx_brightness_set(struct led_classdev *cdev, | |
54 | enum led_brightness brightness) | |
55 | { | |
56 | struct nic78bx_led *nled = to_nic78bx_led(cdev); | |
57 | unsigned long flags; | |
58 | u8 value; | |
59 | ||
60 | spin_lock_irqsave(&nled->data->lock, flags); | |
61 | value = inb(nled->data->io_base); | |
62 | ||
63 | if (brightness) { | |
64 | value &= ~nled->mask; | |
65 | value |= nled->bit; | |
66 | } else { | |
67 | value &= ~nled->bit; | |
68 | } | |
69 | ||
70 | outb(value, nled->data->io_base); | |
71 | spin_unlock_irqrestore(&nled->data->lock, flags); | |
72 | } | |
73 | ||
74 | static enum led_brightness nic78bx_brightness_get(struct led_classdev *cdev) | |
75 | { | |
76 | struct nic78bx_led *nled = to_nic78bx_led(cdev); | |
77 | unsigned long flags; | |
78 | u8 value; | |
79 | ||
80 | spin_lock_irqsave(&nled->data->lock, flags); | |
81 | value = inb(nled->data->io_base); | |
82 | spin_unlock_irqrestore(&nled->data->lock, flags); | |
83 | ||
84 | return (value & nled->bit) ? 1 : LED_OFF; | |
85 | } | |
86 | ||
87 | static struct nic78bx_led nic78bx_leds[] = { | |
88 | { | |
89 | .bit = NIC78BX_USER1_GREEN_LED, | |
90 | .mask = NIC78BX_USER1_LED_MASK, | |
91 | .cdev = { | |
92 | .name = "nilrt:green:user1", | |
93 | .max_brightness = 1, | |
94 | .brightness_set = nic78bx_brightness_set, | |
95 | .brightness_get = nic78bx_brightness_get, | |
96 | } | |
97 | }, | |
98 | { | |
99 | .bit = NIC78BX_USER1_YELLOW_LED, | |
100 | .mask = NIC78BX_USER1_LED_MASK, | |
101 | .cdev = { | |
102 | .name = "nilrt:yellow:user1", | |
103 | .max_brightness = 1, | |
104 | .brightness_set = nic78bx_brightness_set, | |
105 | .brightness_get = nic78bx_brightness_get, | |
106 | } | |
107 | }, | |
108 | { | |
109 | .bit = NIC78BX_USER2_GREEN_LED, | |
110 | .mask = NIC78BX_USER2_LED_MASK, | |
111 | .cdev = { | |
112 | .name = "nilrt:green:user2", | |
113 | .max_brightness = 1, | |
114 | .brightness_set = nic78bx_brightness_set, | |
115 | .brightness_get = nic78bx_brightness_get, | |
116 | } | |
117 | }, | |
118 | { | |
119 | .bit = NIC78BX_USER2_YELLOW_LED, | |
120 | .mask = NIC78BX_USER2_LED_MASK, | |
121 | .cdev = { | |
122 | .name = "nilrt:yellow:user2", | |
123 | .max_brightness = 1, | |
124 | .brightness_set = nic78bx_brightness_set, | |
125 | .brightness_get = nic78bx_brightness_get, | |
126 | } | |
127 | } | |
128 | }; | |
129 | ||
130 | static int nic78bx_probe(struct platform_device *pdev) | |
131 | { | |
132 | struct device *dev = &pdev->dev; | |
133 | struct nic78bx_led_data *led_data; | |
134 | struct resource *io_rc; | |
135 | int ret, i; | |
136 | ||
137 | led_data = devm_kzalloc(dev, sizeof(*led_data), GFP_KERNEL); | |
138 | if (!led_data) | |
139 | return -ENOMEM; | |
140 | ||
141 | led_data->pdev = pdev; | |
142 | platform_set_drvdata(pdev, led_data); | |
143 | ||
144 | io_rc = platform_get_resource(pdev, IORESOURCE_IO, 0); | |
145 | if (!io_rc) { | |
146 | dev_err(dev, "missing IO resources\n"); | |
147 | return -EINVAL; | |
148 | } | |
149 | ||
150 | if (resource_size(io_rc) < NIC78BX_USER_LED_IO_SIZE) { | |
151 | dev_err(dev, "IO region too small\n"); | |
152 | return -EINVAL; | |
153 | } | |
154 | ||
155 | if (!devm_request_region(dev, io_rc->start, resource_size(io_rc), | |
156 | KBUILD_MODNAME)) { | |
157 | dev_err(dev, "failed to get IO region\n"); | |
158 | return -EBUSY; | |
159 | } | |
160 | ||
161 | led_data->io_base = io_rc->start; | |
162 | spin_lock_init(&led_data->lock); | |
163 | ||
164 | for (i = 0; i < ARRAY_SIZE(nic78bx_leds); i++) { | |
165 | nic78bx_leds[i].data = led_data; | |
166 | ||
167 | ret = devm_led_classdev_register(dev, &nic78bx_leds[i].cdev); | |
168 | if (ret) | |
169 | return ret; | |
170 | } | |
171 | ||
172 | /* Unlock LED register */ | |
173 | outb(NIC78BX_UNLOCK_VALUE, | |
174 | led_data->io_base + NIC78BX_LOCK_REG_OFFSET); | |
175 | ||
176 | return ret; | |
177 | } | |
178 | ||
179 | static int nic78bx_remove(struct platform_device *pdev) | |
180 | { | |
181 | struct nic78bx_led_data *led_data = platform_get_drvdata(pdev); | |
182 | ||
183 | /* Lock LED register */ | |
184 | outb(NIC78BX_LOCK_VALUE, | |
185 | led_data->io_base + NIC78BX_LOCK_REG_OFFSET); | |
186 | ||
187 | return 0; | |
188 | } | |
189 | ||
190 | static const struct acpi_device_id led_device_ids[] = { | |
191 | {"NIC78B3", 0}, | |
192 | {"", 0}, | |
193 | }; | |
194 | MODULE_DEVICE_TABLE(acpi, led_device_ids); | |
195 | ||
196 | static struct platform_driver led_driver = { | |
197 | .probe = nic78bx_probe, | |
198 | .remove = nic78bx_remove, | |
199 | .driver = { | |
200 | .name = KBUILD_MODNAME, | |
201 | .acpi_match_table = ACPI_PTR(led_device_ids), | |
202 | }, | |
203 | }; | |
204 | ||
205 | module_platform_driver(led_driver); | |
206 | ||
207 | MODULE_DESCRIPTION("National Instruments PXI User LEDs driver"); | |
208 | MODULE_AUTHOR("Hui Chun Ong <hui.chun.ong@ni.com>"); | |
209 | MODULE_LICENSE("GPL"); |