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69 lines
2.2 KiB
69 lines
2.2 KiB
12 years ago
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From fc3a1f04f5040255cbc086c419e4237f29f89f88 Mon Sep 17 00:00:00 2001
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From: Wolfram Sang <w.sang@pengutronix.de>
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Date: Tue, 13 Dec 2011 18:34:01 +0100
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Subject: [PATCH] gpio: add flags to export GPIOs when requesting
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commit fc3a1f04f5040255cbc086c419e4237f29f89f88 upstream.
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Introduce new flags to automatically export GPIOs when using the convenience
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functions gpio_request_one() or gpio_request_array(). This eases support for
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custom boards where lots of GPIOs need to be exported for customer
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applications.
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Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
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Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
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---
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Documentation/gpio.txt | 3 +++
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drivers/gpio/gpiolib.c | 12 +++++++++++-
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include/linux/gpio.h | 5 +++++
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3 files changed, 19 insertions(+), 1 deletion(-)
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--- a/Documentation/gpio.txt
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+++ b/Documentation/gpio.txt
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@@ -303,6 +303,9 @@ where 'flags' is currently defined to sp
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* GPIOF_INIT_LOW - as output, set initial level to LOW
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* GPIOF_INIT_HIGH - as output, set initial level to HIGH
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+ * GPIOF_EXPORT_DIR_FIXED - export gpio to sysfs, keep direction
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+ * GPIOF_EXPORT_DIR_CHANGEABLE - also export, allow changing direction
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+
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since GPIOF_INIT_* are only valid when configured as output, so group valid
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combinations as:
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--- a/drivers/gpio/gpiolib.c
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+++ b/drivers/gpio/gpiolib.c
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@@ -1289,8 +1289,18 @@ int gpio_request_one(unsigned gpio, unsi
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(flags & GPIOF_INIT_HIGH) ? 1 : 0);
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if (err)
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- gpio_free(gpio);
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+ goto free_gpio;
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+ if (flags & GPIOF_EXPORT) {
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+ err = gpio_export(gpio, flags & GPIOF_EXPORT_CHANGEABLE);
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+ if (err)
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+ goto free_gpio;
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+ }
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+
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+ return 0;
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+
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+ free_gpio:
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+ gpio_free(gpio);
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return err;
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}
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EXPORT_SYMBOL_GPL(gpio_request_one);
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--- a/include/linux/gpio.h
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+++ b/include/linux/gpio.h
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@@ -14,6 +14,11 @@
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#define GPIOF_OUT_INIT_LOW (GPIOF_DIR_OUT | GPIOF_INIT_LOW)
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#define GPIOF_OUT_INIT_HIGH (GPIOF_DIR_OUT | GPIOF_INIT_HIGH)
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+#define GPIOF_EXPORT (1 << 2)
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+#define GPIOF_EXPORT_CHANGEABLE (1 << 3)
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+#define GPIOF_EXPORT_DIR_FIXED (GPIOF_EXPORT)
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+#define GPIOF_EXPORT_DIR_CHANGEABLE (GPIOF_EXPORT | GPIOF_EXPORT_CHANGEABLE)
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+
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/**
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* struct gpio - a structure describing a GPIO with configuration
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* @gpio: the GPIO number
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