summaryrefslogtreecommitdiffstats
path: root/drivers/gpio
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2010-08-05 15:57:35 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-05 15:57:35 -0700
commit03c0c29aff7e56b722eb6c47eace222b140d0377 (patch)
tree47267a19b523159cf36a050ef3c35f4dbdb33016 /drivers/gpio
parentc60c6a96b7bb0f1f8bb635fdfcf5b592aaf062b4 (diff)
parent7fb8f881c54beb05dd4d2c947dada1c636581d87 (diff)
downloadop-kernel-dev-03c0c29aff7e56b722eb6c47eace222b140d0377.zip
op-kernel-dev-03c0c29aff7e56b722eb6c47eace222b140d0377.tar.gz
Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6
* 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6: (63 commits) of/platform: Register of_platform_drivers with an "of:" prefix of/address: Clean up function declarations of/spi: call of_register_spi_devices() from spi core code of: Provide default of_node_to_nid() implementation. of/device: Make of_device_make_bus_id() usable by other code. of/irq: Fix endian issues in parsing interrupt specifiers of: Fix phandle endian issues of/flattree: fix of_flat_dt_is_compatible() to match the full compatible string of: remove of_default_bus_ids of: make of_find_device_by_node generic microblaze: remove references to of_device and to_of_device sparc: remove references to of_device and to_of_device powerpc: remove references to of_device and to_of_device of/device: Replace of_device with platform_device in includes and core code of/device: Protect against binding of_platform_drivers to non-OF devices of: remove asm/of_device.h of: remove asm/of_platform.h of/platform: remove all of_bus_type and of_platform_bus_type references of: Merge of_platform_bus_type with platform_bus_type drivercore/of: Add OF style matching to platform bus ... Fix up trivial conflicts in arch/microblaze/kernel/Makefile due to just some obj-y removals by the devicetree branch, while the microblaze updates added a new file.
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpiolib.c55
-rw-r--r--drivers/gpio/xilinx_gpio.c15
2 files changed, 55 insertions, 15 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 4e51fe3..6a6bd56 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -8,6 +8,7 @@
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/gpio.h>
+#include <linux/of_gpio.h>
#include <linux/idr.h>
#include <linux/slab.h>
@@ -1100,16 +1101,24 @@ int gpiochip_add(struct gpio_chip *chip)
}
}
+ of_gpiochip_add(chip);
+
unlock:
spin_unlock_irqrestore(&gpio_lock, flags);
- if (status == 0)
- status = gpiochip_export(chip);
+
+ if (status)
+ goto fail;
+
+ status = gpiochip_export(chip);
+ if (status)
+ goto fail;
+
+ return 0;
fail:
/* failures here can mean systems won't boot... */
- if (status)
- pr_err("gpiochip_add: gpios %d..%d (%s) failed to register\n",
- chip->base, chip->base + chip->ngpio - 1,
- chip->label ? : "generic");
+ pr_err("gpiochip_add: gpios %d..%d (%s) failed to register\n",
+ chip->base, chip->base + chip->ngpio - 1,
+ chip->label ? : "generic");
return status;
}
EXPORT_SYMBOL_GPL(gpiochip_add);
@@ -1128,6 +1137,8 @@ int gpiochip_remove(struct gpio_chip *chip)
spin_lock_irqsave(&gpio_lock, flags);
+ of_gpiochip_remove(chip);
+
for (id = chip->base; id < chip->base + chip->ngpio; id++) {
if (test_bit(FLAG_REQUESTED, &gpio_desc[id].flags)) {
status = -EBUSY;
@@ -1148,6 +1159,38 @@ int gpiochip_remove(struct gpio_chip *chip)
}
EXPORT_SYMBOL_GPL(gpiochip_remove);
+/**
+ * gpiochip_find() - iterator for locating a specific gpio_chip
+ * @data: data to pass to match function
+ * @callback: Callback function to check gpio_chip
+ *
+ * Similar to bus_find_device. It returns a reference to a gpio_chip as
+ * determined by a user supplied @match callback. The callback should return
+ * 0 if the device doesn't match and non-zero if it does. If the callback is
+ * non-zero, this function will return to the caller and not iterate over any
+ * more gpio_chips.
+ */
+struct gpio_chip *gpiochip_find(void *data,
+ int (*match)(struct gpio_chip *chip, void *data))
+{
+ struct gpio_chip *chip = NULL;
+ unsigned long flags;
+ int i;
+
+ spin_lock_irqsave(&gpio_lock, flags);
+ for (i = 0; i < ARCH_NR_GPIOS; i++) {
+ if (!gpio_desc[i].chip)
+ continue;
+
+ if (match(gpio_desc[i].chip, data)) {
+ chip = gpio_desc[i].chip;
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&gpio_lock, flags);
+
+ return chip;
+}
/* These "optional" allocation calls help prevent drivers from stomping
* on each other, and help provide better diagnostics in debugfs.
diff --git a/drivers/gpio/xilinx_gpio.c b/drivers/gpio/xilinx_gpio.c
index b8fa65b..7096909 100644
--- a/drivers/gpio/xilinx_gpio.c
+++ b/drivers/gpio/xilinx_gpio.c
@@ -161,14 +161,12 @@ static void xgpio_save_regs(struct of_mm_gpio_chip *mm_gc)
static int __devinit xgpio_of_probe(struct device_node *np)
{
struct xgpio_instance *chip;
- struct of_gpio_chip *ofchip;
int status = 0;
const u32 *tree_info;
chip = kzalloc(sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
- ofchip = &chip->mmchip.of_gc;
/* Update GPIO state shadow register with default value */
tree_info = of_get_property(np, "xlnx,dout-default", NULL);
@@ -182,21 +180,20 @@ static int __devinit xgpio_of_probe(struct device_node *np)
chip->gpio_dir = *tree_info;
/* Check device node and parent device node for device width */
- ofchip->gc.ngpio = 32; /* By default assume full GPIO controller */
+ chip->mmchip.gc.ngpio = 32; /* By default assume full GPIO controller */
tree_info = of_get_property(np, "xlnx,gpio-width", NULL);
if (!tree_info)
tree_info = of_get_property(np->parent,
"xlnx,gpio-width", NULL);
if (tree_info)
- ofchip->gc.ngpio = *tree_info;
+ chip->mmchip.gc.ngpio = *tree_info;
spin_lock_init(&chip->gpio_lock);
- ofchip->gpio_cells = 2;
- ofchip->gc.direction_input = xgpio_dir_in;
- ofchip->gc.direction_output = xgpio_dir_out;
- ofchip->gc.get = xgpio_get;
- ofchip->gc.set = xgpio_set;
+ chip->mmchip.gc.direction_input = xgpio_dir_in;
+ chip->mmchip.gc.direction_output = xgpio_dir_out;
+ chip->mmchip.gc.get = xgpio_get;
+ chip->mmchip.gc.set = xgpio_set;
chip->mmchip.save_regs = xgpio_save_regs;
OpenPOWER on IntegriCloud