/***********************************************************************************
* Linux driver 板级文件跟踪一般方法
* 声明：
* 1. 这是本人使用vim+ctags最常用的跟踪方法，也是唯一的方法； :)
* 2. 本人已经在跟踪线上标注了跟踪序号，也就是先后循序；
* 3. 就目前而言，这种方法貌似是通用的；
* 4. 这个例子仅仅是简单的演示，并没有全部展开，如果想要进一步跟踪，
* 继续跟就行了。
* 5. 源代码来自：myzr_android4_2_2_1_1_0.tar.bz2
*
* 2015-6-12 晴 深圳 南山平山村 曾剑锋
**********************************************************************************/ cat arch/arm/mach-mx6/board-mx6q_sabresd.c ......
#define SABRESD_POWER_OFF IMX_GPIO_NR(3, 29) <--------------------------+
...... |
|
#if defined(CONFIG_KEYBOARD_GPIO) || defined(CONFIG_KEYBOARD_GPIO_MODULE) |
#define GPIO_BUTTON(gpio_num, ev_code, act_low, descr, wake, debounce) \ <------+ |
{ \ | |
.gpio = gpio_num, \ | |
.type = EV_KEY, \ | |
.code = ev_code, \ | |
.active_low = act_low, \ | |
.desc = "btn " descr, \ | |
.wakeup = wake, \ ^ |
.debounce_interval = debounce, \ | |
} | |
| |
static struct gpio_keys_button new_sabresd_buttons[] = { <-----<-------+ | |
//GPIO_BUTTON(SABRESD_VOLUME_UP, KEY_VOLUMEUP, 1, "volume-up", 0, 1), | | |
//GPIO_BUTTON(SABRESD_VOLUME_DN, KEY_VOLUMEDOWN, 1, "volume-down", 0, 1), | | |
GPIO_BUTTON(SABRESD_POWER_OFF, KEY_POWER, , "power-key", , ), --->----*--+ |
}; ^------------------------------------------------------*----+
|
static struct gpio_keys_platform_data new_sabresd_button_data = { <-------+ |
.buttons = new_sabresd_buttons, >------------>---------------*--+
.nbuttons = ARRAY_SIZE(new_sabresd_buttons), |
}; |
|
static struct platform_device sabresd_button_device = { <--+ |
.name = "gpio-keys", | |
.id = -, | ^
.num_resources = , | |
}; | |
| |
static void __init imx6q_add_device_buttons(void) <-----*-------+ |
{ | | |
platform_device_add_data(&sabresd_button_device, >---+ | |
&new_sabresd_button_data, | |
sizeof(new_sabresd_button_data)); >-------------*-------+
|
platform_device_register(&sabresd_button_device); |
} |
|
|
...... ^
/*! |
* Board specific initialization. |
*/ |
static void __init mx6_sabresd_board_init(void) <------------<---*--------<-----+
{ | |
...... | |
imx6q_add_device_buttons(); ------>------------->-------------+ |
...... |
} |
|
...... |
/* ^
* initialize __mach_desc_MX6Q_SABRESD data structure. |
*/ |
MACHINE_START(MX6Q_SABRESD, "Freescale i.MX 6Quad/DualLite/Solo Sabre-SD Board") |
/* Maintainer: Freescale Semiconductor, Inc. */ |
.boot_params = MX6_PHYS_OFFSET + 0x100, |
.fixup = fixup_mxc_board, |
.map_io = mx6_map_io, |
.init_irq = mx6_init_irq, |
.init_machine = mx6_sabresd_board_init, ----->------------->------->--------+
.timer = &mx6_sabresd_timer,
.reserve = mx6q_sabresd_reserve,
MACHINE_END