一开始以为是引脚被其它驱动占用引起#xff0c;或者该引脚不具…相关信息

硬件平台全志T507

一开始以为是引脚被其它驱动占用引起或者该引脚不具备中断功能经过排查已排除这两种可能因此通过从源码分析来找问题的根因。

gpio_keys.c

drivers/input/keyboard/gpio_keys.c

static

devm_request_any_context_irq(pdev-dev,

bdata-irq,isr,

devm_request_any_context_irq(struct

device

request_any_context_irq(unsigned

int

{......chip_bus_lock(desc);retval

__setup_irq(irq,

action);chip_bus_sync_unlock(desc);......return

retval;

drivers/pinctrl/sunxi/pinctrl-sunxi.c

static

sunxi_pinctrl_irq_ack,.irq_mask

sunxi_pinctrl_irq_mask,.irq_unmask

sunxi_pinctrl_irq_unmask,.irq_request_resources

sunxi_pinctrl_irq_request_resources,.irq_release_resources

sunxi_pinctrl_irq_release_resources,.irq_set_type

sunxi_pinctrl_irq_set_type,.irq_set_wake

};//

drivers/pinctrl/sunxi/pinctrl-sunxi.c

static

sunxi_pinctrl_irq_request_resources(struct

irq_data

irq_data_get_irq_chip_data(d);struct

sunxi_desc_function

sunxi_pinctrl_desc_find_function_by_pin(pctl,pctl-irq_array[d-hwirq],

irq);if

func-muxval);sunxi_pmx_set(pctl-pctl_dev,

func-muxval);return

drivers/pinctrl/sunxi/pinctrl-sunxi.c

static

pinctrl_dev_get_drvdata(pctldev);unsigned

long

mask;raw_spin_lock_irqsave(pctl-lock,

flags);pin

sunxi_mux_offset(pin);writel((val

~mask)

sunxi_mux_offset(pin),pctl-membase

sunxi_mux_reg(pin));raw_spin_unlock_irqrestore(pctl-lock,

flags);

}无论有多复杂的代码最终都需要通过读写寄存器的方式来实现控制芯片而通过上述代码分析即可发现

sunxi_pmx_set()

接口用于配置寄存器是最底层的接口可以通过打印输出传入的参数来检查是否有问题。

PF3

/sys/kernel/debug/pinctrl/pio/pins

registered

mercury-demo:/sys/kernel/debug/sunxi_pinctrl

echo

mercury-demo:/sys/kernel/debug/sunxi_pinctrl

cat

drivers/pinctrl/sunxi/pinctrl-sunxi.c

static

sunxi_pinctrl_build_state(struct

platform_device

IRQ_PER_BANK;pctl-irq_array[irqnum]

pin-pin.number;printk(KERN_EMERG[lmx]

pctl-irq_array[%d]

func-irqbank);}sunxi_pinctrl_add_function(pctl,

drivers/pinctrl/sunxi/pinctrl-sunxi.h

#define

drivers/pinctrl/sunxi/pinctrl-sunxi.h

#define

drivers/pinctrl/sunxi/pinctrl-sun50iw9p1.c

static

{......SUNXI_PIN(SUNXI_PINCTRL_PIN(G,

sdc1),

io_disabled)),SUNXI_PIN(SUNXI_PINCTRL_PIN(G,

sdc1),

io_disabled)),SUNXI_PIN(SUNXI_PINCTRL_PIN(G,

sdc1),

a/longan/kernel/linux-4.9/drivers/pinctrl/sunxi/pinctrl-sun50iw9p1.cb/longan/kernel/linux-4.9/drivers/pinctrl/sunxi/pinctrl-sun50iw9p1.c-693,7

693,7

io_disabled)),SUNXI_PIN(SUNXI_PINCTRL_PIN(G,

gpio_in),