Messages in this thread Patch in this message | | | Subject | gpiolib: add names file in gpio chip sysfs. | From | ben@fluff ... | Date | Mon, 03 Aug 2009 17:55:36 +0100 |
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Add a 'names' file to the sysfs entries for each chip to show which have names.
Signed-off-by: Ben Dooks <ben@simtec.co.uk> CC: David Brownell <dbrownell@users.sourceforge.net>
--- drivers/gpio/gpiolib.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)
Index: b/drivers/gpio/gpiolib.c =================================================================== --- a/drivers/gpio/gpiolib.c 2009-08-03 17:51:40.000000000 +0100 +++ b/drivers/gpio/gpiolib.c 2009-08-03 17:53:04.000000000 +0100 @@ -303,6 +303,7 @@ static const struct attribute_group gpio * /base ... matching gpio_chip.base (N) * /label ... matching gpio_chip.label * /ngpio ... matching gpio_chip.ngpio + * /names ... matching gpio_chip.names */ static ssize_t chip_base_show(struct device *dev, @@ -332,10 +333,30 @@ static ssize_t chip_ngpio_show(struct de } static DEVICE_ATTR(ngpio, 0444, chip_ngpio_show, NULL); +static ssize_t chip_names_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + const struct gpio_chip*chip = dev_get_drvdata(dev); + char **names = chip->names; + int ptr = 0; + int name; + + if (!names) + return -EINVAL; + + for (name = 0; name < chip->ngpio && ptr < PAGE_SIZE; name++) + ptr += snprintf(buf + ptr, PAGE_SIZE - ptr, + "%s\n", names[name] ? names[name] : ""); + + return ptr; +} +DEVICE_ATTR(names, 0444, chip_names_show, NULL); + static const struct attribute *gpiochip_attrs[] = { &dev_attr_base.attr, &dev_attr_label.attr, &dev_attr_ngpio.attr, + &dev_attr_names.attr, NULL, }; --
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