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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
8338eab5 HCO |
2 | /* |
3 | * Copyright (C) 2016 National Instruments Corp. | |
8338eab5 HCO |
4 | */ |
5 | ||
6 | #include <linux/acpi.h> | |
7 | #include <linux/leds.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/platform_device.h> | |
10 | #include <linux/spinlock.h> | |
11 | ||
12 | #define NIC78BX_USER1_LED_MASK 0x3 | |
13 | #define NIC78BX_USER1_GREEN_LED BIT(0) | |
14 | #define NIC78BX_USER1_YELLOW_LED BIT(1) | |
15 | ||
16 | #define NIC78BX_USER2_LED_MASK 0xC | |
17 | #define NIC78BX_USER2_GREEN_LED BIT(2) | |
18 | #define NIC78BX_USER2_YELLOW_LED BIT(3) | |
19 | ||
20 | #define NIC78BX_LOCK_REG_OFFSET 1 | |
21 | #define NIC78BX_LOCK_VALUE 0xA5 | |
22 | #define NIC78BX_UNLOCK_VALUE 0x5A | |
23 | ||
24 | #define NIC78BX_USER_LED_IO_SIZE 2 | |
25 | ||
26 | struct nic78bx_led_data { | |
27 | u16 io_base; | |
28 | spinlock_t lock; | |
29 | struct platform_device *pdev; | |
30 | }; | |
31 | ||
32 | struct nic78bx_led { | |
33 | u8 bit; | |
34 | u8 mask; | |
35 | struct nic78bx_led_data *data; | |
36 | struct led_classdev cdev; | |
37 | }; | |
38 | ||
39 | static inline struct nic78bx_led *to_nic78bx_led(struct led_classdev *cdev) | |
40 | { | |
41 | return container_of(cdev, struct nic78bx_led, cdev); | |
42 | } | |
43 | ||
44 | static void nic78bx_brightness_set(struct led_classdev *cdev, | |
45 | enum led_brightness brightness) | |
46 | { | |
47 | struct nic78bx_led *nled = to_nic78bx_led(cdev); | |
48 | unsigned long flags; | |
49 | u8 value; | |
50 | ||
51 | spin_lock_irqsave(&nled->data->lock, flags); | |
52 | value = inb(nled->data->io_base); | |
53 | ||
54 | if (brightness) { | |
55 | value &= ~nled->mask; | |
56 | value |= nled->bit; | |
57 | } else { | |
58 | value &= ~nled->bit; | |
59 | } | |
60 | ||
61 | outb(value, nled->data->io_base); | |
62 | spin_unlock_irqrestore(&nled->data->lock, flags); | |
63 | } | |
64 | ||
65 | static enum led_brightness nic78bx_brightness_get(struct led_classdev *cdev) | |
66 | { | |
67 | struct nic78bx_led *nled = to_nic78bx_led(cdev); | |
68 | unsigned long flags; | |
69 | u8 value; | |
70 | ||
71 | spin_lock_irqsave(&nled->data->lock, flags); | |
72 | value = inb(nled->data->io_base); | |
73 | spin_unlock_irqrestore(&nled->data->lock, flags); | |
74 | ||
75 | return (value & nled->bit) ? 1 : LED_OFF; | |
76 | } | |
77 | ||
78 | static struct nic78bx_led nic78bx_leds[] = { | |
79 | { | |
80 | .bit = NIC78BX_USER1_GREEN_LED, | |
81 | .mask = NIC78BX_USER1_LED_MASK, | |
82 | .cdev = { | |
83 | .name = "nilrt:green:user1", | |
84 | .max_brightness = 1, | |
85 | .brightness_set = nic78bx_brightness_set, | |
86 | .brightness_get = nic78bx_brightness_get, | |
87 | } | |
88 | }, | |
89 | { | |
90 | .bit = NIC78BX_USER1_YELLOW_LED, | |
91 | .mask = NIC78BX_USER1_LED_MASK, | |
92 | .cdev = { | |
93 | .name = "nilrt:yellow:user1", | |
94 | .max_brightness = 1, | |
95 | .brightness_set = nic78bx_brightness_set, | |
96 | .brightness_get = nic78bx_brightness_get, | |
97 | } | |
98 | }, | |
99 | { | |
100 | .bit = NIC78BX_USER2_GREEN_LED, | |
101 | .mask = NIC78BX_USER2_LED_MASK, | |
102 | .cdev = { | |
103 | .name = "nilrt:green:user2", | |
104 | .max_brightness = 1, | |
105 | .brightness_set = nic78bx_brightness_set, | |
106 | .brightness_get = nic78bx_brightness_get, | |
107 | } | |
108 | }, | |
109 | { | |
110 | .bit = NIC78BX_USER2_YELLOW_LED, | |
111 | .mask = NIC78BX_USER2_LED_MASK, | |
112 | .cdev = { | |
113 | .name = "nilrt:yellow:user2", | |
114 | .max_brightness = 1, | |
115 | .brightness_set = nic78bx_brightness_set, | |
116 | .brightness_get = nic78bx_brightness_get, | |
117 | } | |
118 | } | |
119 | }; | |
120 | ||
121 | static int nic78bx_probe(struct platform_device *pdev) | |
122 | { | |
123 | struct device *dev = &pdev->dev; | |
124 | struct nic78bx_led_data *led_data; | |
125 | struct resource *io_rc; | |
126 | int ret, i; | |
127 | ||
128 | led_data = devm_kzalloc(dev, sizeof(*led_data), GFP_KERNEL); | |
129 | if (!led_data) | |
130 | return -ENOMEM; | |
131 | ||
132 | led_data->pdev = pdev; | |
133 | platform_set_drvdata(pdev, led_data); | |
134 | ||
135 | io_rc = platform_get_resource(pdev, IORESOURCE_IO, 0); | |
136 | if (!io_rc) { | |
137 | dev_err(dev, "missing IO resources\n"); | |
138 | return -EINVAL; | |
139 | } | |
140 | ||
141 | if (resource_size(io_rc) < NIC78BX_USER_LED_IO_SIZE) { | |
142 | dev_err(dev, "IO region too small\n"); | |
143 | return -EINVAL; | |
144 | } | |
145 | ||
146 | if (!devm_request_region(dev, io_rc->start, resource_size(io_rc), | |
147 | KBUILD_MODNAME)) { | |
148 | dev_err(dev, "failed to get IO region\n"); | |
149 | return -EBUSY; | |
150 | } | |
151 | ||
152 | led_data->io_base = io_rc->start; | |
153 | spin_lock_init(&led_data->lock); | |
154 | ||
155 | for (i = 0; i < ARRAY_SIZE(nic78bx_leds); i++) { | |
156 | nic78bx_leds[i].data = led_data; | |
157 | ||
158 | ret = devm_led_classdev_register(dev, &nic78bx_leds[i].cdev); | |
159 | if (ret) | |
160 | return ret; | |
161 | } | |
162 | ||
163 | /* Unlock LED register */ | |
164 | outb(NIC78BX_UNLOCK_VALUE, | |
165 | led_data->io_base + NIC78BX_LOCK_REG_OFFSET); | |
166 | ||
167 | return ret; | |
168 | } | |
169 | ||
170 | static int nic78bx_remove(struct platform_device *pdev) | |
171 | { | |
172 | struct nic78bx_led_data *led_data = platform_get_drvdata(pdev); | |
173 | ||
174 | /* Lock LED register */ | |
175 | outb(NIC78BX_LOCK_VALUE, | |
176 | led_data->io_base + NIC78BX_LOCK_REG_OFFSET); | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
181 | static const struct acpi_device_id led_device_ids[] = { | |
182 | {"NIC78B3", 0}, | |
183 | {"", 0}, | |
184 | }; | |
185 | MODULE_DEVICE_TABLE(acpi, led_device_ids); | |
186 | ||
187 | static struct platform_driver led_driver = { | |
188 | .probe = nic78bx_probe, | |
189 | .remove = nic78bx_remove, | |
190 | .driver = { | |
191 | .name = KBUILD_MODNAME, | |
192 | .acpi_match_table = ACPI_PTR(led_device_ids), | |
193 | }, | |
194 | }; | |
195 | ||
196 | module_platform_driver(led_driver); | |
197 | ||
198 | MODULE_DESCRIPTION("National Instruments PXI User LEDs driver"); | |
199 | MODULE_AUTHOR("Hui Chun Ong <hui.chun.ong@ni.com>"); | |
200 | MODULE_LICENSE("GPL"); |