Android HAL 分析

核心提示：struct hw_device_t** device){struct led_control_device_t *dev;dev = (struct led_control_device_t *)malloc(sizeof(*dev));memset(dev, 0, sizeof(*dev));dev->com

struct hw_device_t** device)

{

struct led_control_device_t *dev;

dev = (struct led_control_device_t *)malloc(sizeof(*dev));

memset(dev, 0, sizeof(*dev));

dev->common.tag = HARDWARE_DEVICE_TAG;

dev->common.version = 0;

dev->common.module = module;

dev->common.close = led_device_close;

dev->set_on = led_on;

dev->set_off = led_off;

*device = &dev->common;

/*

* Initialize Led hardware here.

*/

dev->fd = open(LED_DEVICE, O_RDONLY);

if (dev->fd < 0)

return -1;

led_off(dev, LED_C608);

led_off(dev, LED_C609);

success:

return 0;

}

(2.4)填充具体API操作代码

int led_on(struct led_control_device_t *dev, int32_t led)

{

int fd;

LOGI("LED Stub: set %d on.", led);

fd = dev->fd;

switch (led) {

case LED_C608:

ioctl(fd, 1, &led);

break;

case LED_C609:

ioctl(fd, 1, &led);

break;

default:

return -1;

}

return 0;

}

int led_off(struct led_control_device_t *dev, int32_t led)

{

int fd;

LOGI("LED Stub: set %d off.", led);

fd = dev->fd;

switch (led) {

case LED_C608:

ioctl(fd, 2, &led);

break;

case LED_C609:

ioctl(fd, 2, &led);

break;

default:

return -1;

}

return 0;

}