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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
26struct nic78bx_led_data {
27 u16 io_base;
28 spinlock_t lock;
29 struct platform_device *pdev;
30};
31
32struct nic78bx_led {
33 u8 bit;
34 u8 mask;
35 struct nic78bx_led_data *data;
36 struct led_classdev cdev;
37};
38
39static inline struct nic78bx_led *to_nic78bx_led(struct led_classdev *cdev)
40{
41 return container_of(cdev, struct nic78bx_led, cdev);
42}
43
44static 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
65static 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
78static 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
121static 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
164 outb(NIC78BX_UNLOCK_VALUE,
165 led_data->io_base + NIC78BX_LOCK_REG_OFFSET);
166
167 return ret;
168}
169
170static int nic78bx_remove(struct platform_device *pdev)
171{
172 struct nic78bx_led_data *led_data = platform_get_drvdata(pdev);
173
174
175 outb(NIC78BX_LOCK_VALUE,
176 led_data->io_base + NIC78BX_LOCK_REG_OFFSET);
177
178 return 0;
179}
180
181static const struct acpi_device_id led_device_ids[] = {
182 {"NIC78B3", 0},
183 {"", 0},
184};
185MODULE_DEVICE_TABLE(acpi, led_device_ids);
186
187static 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
196module_platform_driver(led_driver);
197
198MODULE_DESCRIPTION("National Instruments PXI User LEDs driver");
199MODULE_AUTHOR("Hui Chun Ong <hui.chun.ong@ni.com>");
200MODULE_LICENSE("GPL");
201
