基于设备树的TQ2440的中断（2）

下面以按键中断为例看看基于设备数的中断的用法：

设备树：

    tq2440_key {
        compatible = "tq2440,key";
        interrupt-parent = <&gpf>;
        interrupts = <0 IRQ_TYPE_EDGE_FALLING>, <1 IRQ_TYPE_EDGE_FALLING>;
        key_3 = <&gpf 2 GPIO_ACTIVE_HIGH>;
        key_4 = <&gpf 4 GPIO_ACTIVE_HIGH>;
        key_8 = <&gpg 0 GPIO_ACTIVE_HIGH>;
    };

驱动：

 1 #include <linux/init.h>
 2 #include <linux/module.h>
 3 #include <linux/platform_device.h>
 4 #include <linux/gpio.h>
 5 #include <linux/of.h>
 6 #include <linux/of_gpio.h>
 7 #include <linux/interrupt.h>
 8 
 9 static irqreturn_t tq2440_key_isr(int irq, void *dev_id)
10 {
11     printk("%s enter, irq: %d, %s\n", __func__, irq, (char *)dev_id);
12     return IRQ_HANDLED;
13 }
14 
15 static int tq2440_key_probe(struct platform_device *pdev) {
16     struct device *dev = &pdev->dev;
17     int irq_gpio = -1;
18     int irq = -1;
19 
20     printk("%s enter.\n", __func__);
21 
22     if (!dev->of_node) {
23         dev_err(dev, "no platform data.\n");
24         return -EINVAL;
25     }
26 
27     irq = platform_get_irq(pdev, 0);
28     printk("%s: get irq %d\n", __func__, irq);
29     devm_request_any_context_irq(dev, irq,
30         tq2440_key_isr, IRQF_TRIGGER_FALLING, "key-1", "key-1");
31 
32     irq = platform_get_irq(pdev, 1);
33     printk("%s: get irq %d\n", __func__, irq);
34     devm_request_any_context_irq(dev, irq,
35         tq2440_key_isr, IRQF_TRIGGER_FALLING, "key-2", "key-2");
36 
37     irq_gpio = of_get_named_gpio(dev->of_node, "key_3", 0);
38     irq = gpio_to_irq(irq_gpio);
39     printk("%s: gpio: %d ---> irq (%d)\n", __func__, irq_gpio, irq);
40     devm_request_any_context_irq(dev, irq,
41         tq2440_key_isr, IRQF_TRIGGER_FALLING, "key-3", "key-3");
42 
43     irq_gpio = of_get_named_gpio(dev->of_node, "key_4", 0);
44     irq = gpio_to_irq(irq_gpio);
45     printk("%s: gpio: %d ---> irq (%d)\n", __func__, irq_gpio, irq);
46     devm_request_any_context_irq(dev, irq,
47         tq2440_key_isr, IRQF_TRIGGER_FALLING, "key-4", "key-4");
48 
49     irq_gpio = of_get_named_gpio(dev->of_node, "key_8", 0);
50     irq = gpio_to_irq(irq_gpio);
51     printk("%s: gpio: %d ---> irq (%d)\n", __func__, irq_gpio, irq);
52     devm_request_any_context_irq(dev, irq,
53         tq2440_key_isr, IRQF_TRIGGER_FALLING, "key-8", "key-8");
54 
55     return 0;
56 }
57 
58 static int tq2440_key_remove(struct platform_device *pdev) {
59 
60     printk("%s enter.\n", __func__);
61 
62     return 0;
63 }
64 
65 static const struct of_device_id tq2440_key_dt_ids[] = {
66     { .compatible = "tq2440,key", },
67     {},
68 };
69 
70 MODULE_DEVICE_TABLE(of, tq2440_key_dt_ids);
71 
72 static struct platform_driver tq2440_key_driver = {
73     .driver        = {
74         .name    = "tq2440_key",
75         .of_match_table    = of_match_ptr(tq2440_key_dt_ids),
76     },
77     .probe        = tq2440_key_probe,
78     .remove        = tq2440_key_remove,
79 };
80 
81 static int __init tq2440_key_init(void)
82 {
83     int ret;
84 
85     ret = platform_driver_register(&tq2440_key_driver);
86     if (ret)
87         printk(KERN_ERR "tq2440_key: probe failed: %d\n", ret);
88 
89     return ret;
90 }
91 module_init(tq2440_key_init);
92 
93 static void __exit tq2440_key_exit(void)
94 {
95     platform_driver_unregister(&tq2440_key_driver);
96 }
97 module_exit(tq2440_key_exit);
98 
99 MODULE_LICENSE("GPL");
View Code

启动后，加载驱动，可以看看/proc/interrupts：

[root@tq2440 mnt]# cat /proc/interrupts 
           CPU0       
  7:        252  s3c-eint   7 Edge      eth0
  8:          0       s3c   8 Edge      s3c2410-rtc tick
 13:      37624       s3c  13 Edge      samsung_time_irq
 15:          7  s3c2410-eint0_3   0 Edge      key-1
 17:         10  s3c2410-eint0_3   1 Edge      key-2
 18:         12  s3c2410-eint0_3   2 Edge      key-3
 19:          6  s3c-eint   4 Edge      key-4
 20:          0  s3c-eint   0 Edge      key-8
 26:          0       s3c  26 Edge      ohci_hcd:usb1
 27:          4       s3c  27 Edge      54000000.i2c
 30:          0       s3c  30 Edge      s3c2410-rtc alarm
 32:        236  s3c-level  32 Level     50000000.serial
 33:       2820  s3c-level  33 Level     50000000.serial
 59:          0  s3c-level  59 Edge      53000000.watchdog

下面是加载驱动的时候时的log：

<7>[   29.155953] tq2440_key_probe enter.
<7>[   29.156100] tq2440_key_probe: get irq 15
<7>[   29.156350] tq2440_key_probe: get irq 17
<7>[   29.156546] tq2440_key_probe: gpio: 86 ---> irq (18)
<7>[   29.156803] tq2440_key_probe: gpio: 88 ---> irq (19)
<7>[   29.157061] tq2440_key_probe: gpio: 92 ---> irq (20)

按键的时候会看到下面的log：

<7>[  350.161506] tq2440_key_isr enter, irq: 17, key-2
<7>[  354.624168] tq2440_key_isr enter, irq: 18, key-3
<7>[  355.301634] tq2440_key_isr enter, irq: 19, key-4
<7>[  357.053889] tq2440_key_isr enter, irq: 15, key-1
<7>[  368.231196] tq2440_key_isr enter, irq: 20, key-8

可以在中断处理函数中将调用栈打印出来：

EINT0_3中断对应的log：

<7>[  483.595441] [<bf008044>] (tq2440_key_isr [interrupts_demo]) from [<c00447d8>] (__handle_irq_event_percpu+0x3c/0x130)
<7>[  483.595481] [<c00447d8>] (__handle_irq_event_percpu) from [<c00448e8>] (handle_irq_event_percpu+0x1c/0x54)
<7>[  483.595521] [<c00448e8>] (handle_irq_event_percpu) from [<c0044948>] (handle_irq_event+0x28/0x3c)
<7>[  483.595558] [<c0044948>] (handle_irq_event) from [<c00476a8>] (handle_edge_irq+0xbc/0x190)
<7>[  483.595586] [<c00476a8>] (handle_edge_irq) from [<c0043fd8>] (generic_handle_irq+0x2c/0x40)
<7>[  483.595621] [<c0043fd8>] (generic_handle_irq) from [<c00441ac>] (__handle_domain_irq+0x6c/0xcc)
<7>[  483.595653] [<c00441ac>] (__handle_domain_irq) from [<c0009444>] (s3c24xx_handle_irq+0x6c/0x12c)
<7>[  483.595681] [<c0009444>] (s3c24xx_handle_irq) from [<c000e5fc>] (__irq_svc+0x5c/0x78)

EINT4：

<7>[  594.735684] [<bf008044>] (tq2440_key_isr [interrupts_demo]) from [<c00447d8>] (__handle_irq_event_percpu+0x3c/0x130)
<7>[  594.735725] [<c00447d8>] (__handle_irq_event_percpu) from [<c00448e8>] (handle_irq_event_percpu+0x1c/0x54)
<7>[  594.735764] [<c00448e8>] (handle_irq_event_percpu) from [<c0044948>] (handle_irq_event+0x28/0x3c)
<7>[  594.735801] [<c0044948>] (handle_irq_event) from [<c00476a8>] (handle_edge_irq+0xbc/0x190)
<7>[  594.735832] [<c00476a8>] (handle_edge_irq) from [<c0043fd8>] (generic_handle_irq+0x2c/0x40)
<7>[  594.735878] [<c0043fd8>] (generic_handle_irq) from [<c02490f4>] (s3c24xx_demux_eint4_7+0xa4/0x120)
<7>[  594.735916] [<c02490f4>] (s3c24xx_demux_eint4_7) from [<c00441ac>] (__handle_domain_irq+0x6c/0xcc)
<7>[  594.735946] [<c00441ac>] (__handle_domain_irq) from [<c0009444>] (s3c24xx_handle_irq+0x6c/0x12c)
<7>[  594.735975] [<c0009444>] (s3c24xx_handle_irq) from [<c000e5fc>] (__irq_svc+0x5c/0x78)

EINT8：

<7>[  652.506024] [<bf008044>] (tq2440_key_isr [interrupts_demo]) from [<c00447d8>] (__handle_irq_event_percpu+0x3c/0x130)
<7>[  652.506065] [<c00447d8>] (__handle_irq_event_percpu) from [<c00448e8>] (handle_irq_event_percpu+0x1c/0x54)
<7>[  652.506106] [<c00448e8>] (handle_irq_event_percpu) from [<c0044948>] (handle_irq_event+0x28/0x3c)
<7>[  652.506142] [<c0044948>] (handle_irq_event) from [<c00476a8>] (handle_edge_irq+0xbc/0x190)
<7>[  652.506171] [<c00476a8>] (handle_edge_irq) from [<c0043fd8>] (generic_handle_irq+0x2c/0x40)
<7>[  652.506219] [<c0043fd8>] (generic_handle_irq) from [<c0249224>] (s3c24xx_demux_eint8_23+0xb4/0x130)
<7>[  652.506258] [<c0249224>] (s3c24xx_demux_eint8_23) from [<c00441ac>] (__handle_domain_irq+0x6c/0xcc)
<7>[  652.506287] [<c00441ac>] (__handle_domain_irq) from [<c0009444>] (s3c24xx_handle_irq+0x6c/0x12c)
<7>[  652.506316] [<c0009444>] (s3c24xx_handle_irq) from [<c000e5fc>] (__irq_svc+0x5c/0x78)

 

完。

posted @ 2017-05-13 14:06  摩斯电码  阅读(1203)  评论(0)  编辑  收藏  举报