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misc: rp1-pio: Add compat_ioctl method #6476

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Nov 18, 2024
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misc: rp1-pio: Add compat_ioctl method #6476

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64 changes: 64 additions & 0 deletions drivers/misc/rp1-pio.c
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Original file line number Diff line number Diff line change
Expand Up @@ -996,11 +996,75 @@ static long rp1_pio_ioctl(struct file *filp, unsigned int ioctl_num,
return ret;
}

#ifdef CONFIG_COMPAT

struct rp1_pio_sm_xfer_data_args_compat {
uint16_t sm;
uint16_t dir;
uint16_t data_bytes;
compat_uptr_t data;
};

struct rp1_access_hw_args_compat {
uint32_t addr;
uint32_t len;
compat_uptr_t data;
};

#define PIO_IOC_SM_XFER_DATA_COMPAT _IOW(PIO_IOC_MAGIC, 1, struct rp1_pio_sm_xfer_data_args_compat)
#define PIO_IOC_READ_HW_COMPAT _IOW(PIO_IOC_MAGIC, 8, struct rp1_access_hw_args_compat)
#define PIO_IOC_WRITE_HW_COMPAT _IOW(PIO_IOC_MAGIC, 9, struct rp1_access_hw_args_compat)

static long rp1_pio_compat_ioctl(struct file *filp, unsigned int ioctl_num,
unsigned long ioctl_param)
{
struct rp1_pio_client *client = filp->private_data;

switch (ioctl_num) {
case PIO_IOC_SM_XFER_DATA_COMPAT:
{
struct rp1_pio_sm_xfer_data_args_compat compat_param;
struct rp1_pio_sm_xfer_data_args param;

if (copy_from_user(&compat_param, compat_ptr(ioctl_param), sizeof(compat_param)))
return -EFAULT;
param.sm = compat_param.sm;
param.dir = compat_param.dir;
param.data_bytes = compat_param.data_bytes;
param.data = compat_ptr(compat_param.data);
return rp1_pio_sm_xfer_data(client, &param);
}

case PIO_IOC_READ_HW_COMPAT:
case PIO_IOC_WRITE_HW_COMPAT:
{
struct rp1_access_hw_args_compat compat_param;
struct rp1_access_hw_args param;

if (copy_from_user(&compat_param, compat_ptr(ioctl_param), sizeof(compat_param)))
return -EFAULT;
param.addr = compat_param.addr;
param.len = compat_param.len;
param.data = compat_ptr(compat_param.data);
if (ioctl_num == PIO_IOC_READ_HW_COMPAT)
return rp1_pio_read_hw(client, &param);
else
return rp1_pio_write_hw(client, &param);
}
default:
return rp1_pio_ioctl(filp, ioctl_num, ioctl_param);
}
}
#else
#define rp1_pio_compat_ioctl NULL
#endif

const struct file_operations rp1_pio_fops = {
.owner = THIS_MODULE,
.open = rp1_pio_open,
.release = rp1_pio_release,
.unlocked_ioctl = rp1_pio_ioctl,
.compat_ioctl = rp1_pio_compat_ioctl,
};

static int rp1_pio_probe(struct platform_device *pdev)
Expand Down