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Subjectgpiolib: add names file in gpio chip sysfs.
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Date
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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