2011-7-25 19:58:43

原创于 2011-07-26 12:00:15 发布 · 509 阅读

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文章标签：

#keyboard #matrix #struct #null #ui

本文详细介绍了在PXA3XX处理器上实现音量控制中断处理的过程，包括读取键盘控制器状态、扫描矩阵和直接输入等关键步骤。

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2011-7-25 19:58:43

音量按键

pxa3xx_keypad_interrupt

receive the dbus message for volume control--------->

static irqreturn_t pxa3xx_keypad_interrupt(int irq, void *dev_id)
{
struct pxa3xx_keypad *keypad = dev_id;
#ifdef CONFIG_KEYBOARD_ASTRI
uint32_t kpc;

spin_lock_irq(&keypad->rotary_lock);
printk("pxa3xx_keypad_interrupt\n");
kpc = keypad_readl(keypad->mmio_base, KPC);
#else
uint32_t kpc = keypad_readl(keypad->mmio_base, KPC);
#endif

#ifdef CONFIG_LITTLETON_BACKLIGHT
extern led_keypad_press(void);
led_keypad_press();
#endif

if (kpc & KPC_MI)
pxa3xx_keypad_scan_matrix(keypad);

if (kpc & KPC_DI)
pxa3xx_keypad_scan_direct(keypad);

#ifdef CONFIG_KEYBOARD_ASTRI
/* Driver all columns to high */
kpc = keypad_readl(keypad->mmio_base, KPC);
kpc |= (KPC_MS_ALL);
keypad_writel(keypad->mmio_base, KPC, kpc);
spin_unlock_irq(&keypad->rotary_lock);
#ifdef CONFIG_IPM
ipm_event_notify(IPM_EVENT_UI, IPM_EVENT_DEVICE_KEYPAD, NULL, 0);
#endif
#endif
return IRQ_HANDLED;
}