diff options
Diffstat (limited to 'drivers/gpio/gpiolib.c')
| -rw-r--r-- | drivers/gpio/gpiolib.c | 51 |
1 files changed, 49 insertions, 2 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 797c790aa750..3580c0de9d5a 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -331,14 +331,15 @@ static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) struct gpio_device *gdev = filp->private_data; struct gpio_chip *chip = gdev->chip; int __user *ip = (int __user *)arg; - struct gpiochip_info chipinfo; /* We fail any subsequent ioctl():s when the chip is gone */ if (!chip) return -ENODEV; + /* Fill in the struct and pass to userspace */ if (cmd == GPIO_GET_CHIPINFO_IOCTL) { - /* Fill in the struct and pass to userspace */ + struct gpiochip_info chipinfo; + strncpy(chipinfo.name, dev_name(&gdev->dev), sizeof(chipinfo.name)); chipinfo.name[sizeof(chipinfo.name)-1] = '\0'; @@ -349,6 +350,52 @@ static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) if (copy_to_user(ip, &chipinfo, sizeof(chipinfo))) return -EFAULT; return 0; + } else if (cmd == GPIO_GET_LINEINFO_IOCTL) { + struct gpioline_info lineinfo; + struct gpio_desc *desc; + + if (copy_from_user(&lineinfo, ip, sizeof(lineinfo))) + return -EFAULT; + if (lineinfo.line_offset > gdev->ngpio) + return -EINVAL; + + desc = &gdev->descs[lineinfo.line_offset]; + if (desc->name) { + strncpy(lineinfo.name, desc->name, + sizeof(lineinfo.name)); + lineinfo.name[sizeof(lineinfo.name)-1] = '\0'; + } else { + lineinfo.name[0] = '\0'; + } + if (desc->label) { + strncpy(lineinfo.label, desc->label, + sizeof(lineinfo.label)); + lineinfo.label[sizeof(lineinfo.label)-1] = '\0'; + } else { + lineinfo.label[0] = '\0'; + } + + /* + * Userspace only need to know that the kernel is using + * this GPIO so it can't use it. + */ + lineinfo.flags = 0; + if (desc->flags & (FLAG_REQUESTED | FLAG_IS_HOGGED | + FLAG_USED_AS_IRQ | FLAG_EXPORT | + FLAG_SYSFS)) + lineinfo.flags |= GPIOLINE_FLAG_KERNEL; + if (desc->flags & FLAG_IS_OUT) + lineinfo.flags |= GPIOLINE_FLAG_IS_OUT; + if (desc->flags & FLAG_ACTIVE_LOW) + lineinfo.flags |= GPIOLINE_FLAG_ACTIVE_LOW; + if (desc->flags & FLAG_OPEN_DRAIN) + lineinfo.flags |= GPIOLINE_FLAG_OPEN_DRAIN; + if (desc->flags & FLAG_OPEN_SOURCE) + lineinfo.flags |= GPIOLINE_FLAG_OPEN_SOURCE; + + if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) + return -EFAULT; + return 0; } return -EINVAL; } |