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@@ -35,6 +35,7 @@ struct cashd_device {
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unsigned int in_status;
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unsigned int status_changed;
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int last_status;
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+ int read_flag;
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struct delayed_work delay_work1;
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struct delayed_work delay_work2;
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void __iomem *gpio_ctl_reg_base;
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@@ -105,6 +106,7 @@ static int cashd_open(struct inode *inode, struct file *filp)
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}
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filp->private_data = dev;
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+ dev->read_flag = 0;
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pr_info("cashd: Device /dev/cashd%d opened\n", minor);
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return 0;
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@@ -129,7 +131,11 @@ static ssize_t cashd_read(struct file *filp, char __user *buf,
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if (!buf || count == 0)
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return -EINVAL;
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-
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+ if(dev->read_flag >= 1)
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+ {
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+ return 0;
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+ }
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+ dev->read_flag++;
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dev->in_status = readl(dev->gpio_status_reg_base);
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if(dev->in_status & 0x2)
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liu qidong [url ssh://qidong.liu@10.2.90.253:29418/]
4 minggu lalu