rename target/linux/generic-2.6 to generic

[openwrt/openwrt.git] / target / linux / generic-2.6 / patches-2.6.25 / 962-backport_gpiolib_dynamic_gpio_number_allocation.patch

diff --git a/target/linux/generic-2.6/patches-2.6.25/962-backport_gpiolib_dynamic_gpio_number_allocation.patch b/target/linux/generic-2.6/patches-2.6.25/962-backport_gpiolib_dynamic_gpio_number_allocation.patch
deleted file mode 100644 (file)
index 0960f67..0000000
--- a/target/linux/generic-2.6/patches-2.6.25/962-backport_gpiolib_dynamic_gpio_number_allocation.patch
+++ /dev/null
@@ -1,116 +0,0 @@
-From: Anton Vorontsov <avorontsov@ru.mvista.com>
-Date: Mon, 28 Apr 2008 09:14:46 +0000 (-0700)
-Subject: gpiolib: dynamic gpio number allocation
-X-Git-Tag: v2.6.26-rc1~848
-X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=8d0aab2f16c4fa170f32e7a74a52cd0122bbafef
-
-gpiolib: dynamic gpio number allocation
-
-If gpio_chip->base is negative during registration, gpiolib performs dynamic
-base allocation.  This is useful for devices that aren't always present, such
-as GPIOs on hotplugged devices rather than mainboards.  (This behavior was
-previously specified but not implemented.)
-
-To avoid using any numbers that may have been explicitly assigned but not yet
-registered, this dynamic allocation assigns GPIO numbers from the biggest
-number on down, instead of from the smallest on up.
-
-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
-@@ -80,6 +80,33 @@ static inline struct gpio_chip *gpio_to_
-       return gpio_desc[gpio].chip;
- }
- 
-+/* dynamic allocation of GPIOs, e.g. on a hotplugged device */
-+static int gpiochip_find_base(int ngpio)
-+{
-+      int i;
-+      int spare = 0;
-+      int base = -ENOSPC;
-+
-+      for (i = ARCH_NR_GPIOS - 1; i >= 0 ; i--) {
-+              struct gpio_chip *chip = gpio_desc[i].chip;
-+
-+              if (!chip) {
-+                      spare++;
-+                      if (spare == ngpio) {
-+                              base = i;
-+                              break;
-+                      }
-+              } else {
-+                      spare = 0;
-+                      i -= chip->ngpio - 1;
-+              }
-+      }
-+
-+      if (gpio_is_valid(base))
-+              pr_debug("%s: found new base at %d\n", __func__, base);
-+      return base;
-+}
-+
- /**
-  * gpiochip_add() - register a gpio_chip
-  * @chip: the chip to register, with chip->base initialized
-@@ -88,38 +115,49 @@ static inline struct gpio_chip *gpio_to_
-  * Returns a negative errno if the chip can't be registered, such as
-  * because the chip->base is invalid or already associated with a
-  * different chip.  Otherwise it returns zero as a success code.
-+ *
-+ * If chip->base is negative, this requests dynamic assignment of
-+ * a range of valid GPIOs.
-  */
- int gpiochip_add(struct gpio_chip *chip)
- {
-       unsigned long   flags;
-       int             status = 0;
-       unsigned        id;
-+      int             base = chip->base;
- 
--      /* NOTE chip->base negative is reserved to mean a request for
--       * dynamic allocation.  We don't currently support that.
--       */
--
--      if (chip->base < 0 || !gpio_is_valid(chip->base  + chip->ngpio)) {
-+      if ((!gpio_is_valid(base) || !gpio_is_valid(base + chip->ngpio))
-+                      && base >= 0) {
-               status = -EINVAL;
-               goto fail;
-       }
- 
-       spin_lock_irqsave(&gpio_lock, flags);
- 
-+      if (base < 0) {
-+              base = gpiochip_find_base(chip->ngpio);
-+              if (base < 0) {
-+                      status = base;
-+                      goto fail_unlock;
-+              }
-+              chip->base = base;
-+      }
-+
-       /* these GPIO numbers must not be managed by another gpio_chip */
--      for (id = chip->base; id < chip->base + chip->ngpio; id++) {
-+      for (id = base; id < base + chip->ngpio; id++) {
-               if (gpio_desc[id].chip != NULL) {
-                       status = -EBUSY;
-                       break;
-               }
-       }
-       if (status == 0) {
--              for (id = chip->base; id < chip->base + chip->ngpio; id++) {
-+              for (id = base; id < base + chip->ngpio; id++) {
-                       gpio_desc[id].chip = chip;
-                       gpio_desc[id].flags = 0;
-               }
-       }
- 
-+fail_unlock:
-       spin_unlock_irqrestore(&gpio_lock, flags);
- fail:
-       /* failures here can mean systems won't boot... */