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gpio: store reflect the label to userspace

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The gpio_chip label is useful for userspace to understand what
kind of GPIO chip it is dealing with. Let's store a copy of this
label in the gpio_device, add it to the struct passed to userspace
for GPIO_GET_CHIPINFO_IOCTL and modify lsgpio to show it.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij
2016-02-12 14:48:23 +01:00
parent 0a7439ef75
commit df4878e969
5 changed files with 22 additions and 3 deletions
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13
drivers/gpio/gpiolib.c
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@@ -342,6 +342,9 @@ static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
strncpy(chipinfo.name, dev_name(&gdev->dev),
sizeof(chipinfo.name));
chipinfo.name[sizeof(chipinfo.name)-1] = '\0';
strncpy(chipinfo.label, gdev->label,
sizeof(chipinfo.label));
chipinfo.label[sizeof(chipinfo.label)-1] = '\0';
chipinfo.lines = gdev->ngpio;
if (copy_to_user(ip, &chipinfo, sizeof(chipinfo)))
return -EFAULT;
@@ -479,6 +482,16 @@ int gpiochip_add_data(struct gpio_chip *chip, void *data)
status = -EINVAL;
goto err_free_gdev;
}
if (chip->label)
gdev->label = devm_kstrdup(&gdev->dev, chip->label, GFP_KERNEL);
else
gdev->label = devm_kstrdup(&gdev->dev, "unknown", GFP_KERNEL);
if (!gdev->label) {
status = -ENOMEM;
goto err_free_gdev;
}
gdev->ngpio = chip->ngpio;
gdev->data = data;