rename target/linux/generic-2.6 to generic

[openwrt/svn-archive/archive.git] / target / linux / generic-2.6 / patches-2.6.25 / 963-backport_gpio_chip_reserve.patch

diff --git a/target/linux/generic-2.6/patches-2.6.25/963-backport_gpio_chip_reserve.patch b/target/linux/generic-2.6/patches-2.6.25/963-backport_gpio_chip_reserve.patch
deleted file mode 100644 (file)
index abf77c3..0000000
--- a/target/linux/generic-2.6/patches-2.6.25/963-backport_gpio_chip_reserve.patch
+++ /dev/null
@@ -1,112 +0,0 @@
-From: Anton Vorontsov <avorontsov@ru.mvista.com>
-Date: Mon, 28 Apr 2008 09:14:47 +0000 (-0700)
-Subject: gpiochip_reserve()
-X-Git-Tag: v2.6.26-rc1~847
-X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=169b6a7a6e91e1ea32136681b475cbaf2074bf35
-
-gpiochip_reserve()
-
-Add a new function gpiochip_reserve() to reserve ranges of gpios that platform
-code has pre-allocated.  That is, this marks gpio numbers which will be
-claimed by drivers that haven't yet been loaded, and thus are not available
-for dynamic gpio number allocation.
-
-[akpm@linux-foundation.org: remove unneeded __must_check]
-[david-b@pacbell.net: don't export gpiochip_reserve (section fix)]
-Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
-Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
-Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
-Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
----
-
---- a/drivers/gpio/gpiolib.c
-+++ b/drivers/gpio/gpiolib.c
-@@ -43,6 +43,7 @@ struct gpio_desc {
- /* flag symbols are bit numbers */
- #define FLAG_REQUESTED        0
- #define FLAG_IS_OUT   1
-+#define FLAG_RESERVED 2
- 
- #ifdef CONFIG_DEBUG_FS
-       const char              *label;
-@@ -88,9 +89,10 @@ static int gpiochip_find_base(int ngpio)
-       int base = -ENOSPC;
- 
-       for (i = ARCH_NR_GPIOS - 1; i >= 0 ; i--) {
--              struct gpio_chip *chip = gpio_desc[i].chip;
-+              struct gpio_desc *desc = &gpio_desc[i];
-+              struct gpio_chip *chip = desc->chip;
- 
--              if (!chip) {
-+              if (!chip && !test_bit(FLAG_RESERVED, &desc->flags)) {
-                       spare++;
-                       if (spare == ngpio) {
-                               base = i;
-@@ -98,7 +100,8 @@ static int gpiochip_find_base(int ngpio)
-                       }
-               } else {
-                       spare = 0;
--                      i -= chip->ngpio - 1;
-+                      if (chip)
-+                              i -= chip->ngpio - 1;
-               }
-       }
- 
-@@ -108,6 +111,47 @@ static int gpiochip_find_base(int ngpio)
- }
- 
- /**
-+ * gpiochip_reserve() - reserve range of gpios to use with platform code only
-+ * @start: starting gpio number
-+ * @ngpio: number of gpios to reserve
-+ * Context: platform init, potentially before irqs or kmalloc will work
-+ *
-+ * Returns a negative errno if any gpio within the range is already reserved
-+ * or registered, else returns zero as a success code.  Use this function
-+ * to mark a range of gpios as unavailable for dynamic gpio number allocation,
-+ * for example because its driver support is not yet loaded.
-+ */
-+int __init gpiochip_reserve(int start, int ngpio)
-+{
-+      int ret = 0;
-+      unsigned long flags;
-+      int i;
-+
-+      if (!gpio_is_valid(start) || !gpio_is_valid(start + ngpio))
-+              return -EINVAL;
-+
-+      spin_lock_irqsave(&gpio_lock, flags);
-+
-+      for (i = start; i < start + ngpio; i++) {
-+              struct gpio_desc *desc = &gpio_desc[i];
-+
-+              if (desc->chip || test_bit(FLAG_RESERVED, &desc->flags)) {
-+                      ret = -EBUSY;
-+                      goto err;
-+              }
-+
-+              set_bit(FLAG_RESERVED, &desc->flags);
-+      }
-+
-+      pr_debug("%s: reserved gpios from %d to %d\n",
-+               __func__, start, start + ngpio - 1);
-+err:
-+      spin_unlock_irqrestore(&gpio_lock, flags);
-+
-+      return ret;
-+}
-+
-+/**
-  * gpiochip_add() - register a gpio_chip
-  * @chip: the chip to register, with chip->base initialized
-  * Context: potentially before irqs or kmalloc will work
---- a/include/asm-generic/gpio.h
-+++ b/include/asm-generic/gpio.h
-@@ -74,6 +74,7 @@ struct gpio_chip {
- 
- extern const char *gpiochip_is_requested(struct gpio_chip *chip,
-                       unsigned offset);
-+extern int __init __must_check gpiochip_reserve(int start, int ngpio);
- 
- /* add/remove chips */
- extern int gpiochip_add(struct gpio_chip *chip);