linux-kernel - [v3 1/7] gpiolib: Add support for removing registered consumer lookup table

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Message-Id: <1435309330-50725-2-git-send-email-shobhit.kumar@intel.com>
Date:	Fri, 26 Jun 2015 14:32:04 +0530
From:	Shobhit Kumar <shobhit.kumar@...el.com>
To:	linux-pwm <linux-pwm@...r.kernel.org>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	dri-devel <dri-devel@...ts.freedesktop.org>,
	linux-gpio <linux-gpio@...r.kernel.org>
Cc:	Paul Bolle <pebolle@...cali.nl>,
	Jani Nikula <jani.nikula@...el.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Alexandre Courbot <gnurou@...il.com>,
	David Airlie <airlied@...ux.ie>,
	Povilas Staniulis <wdmonster@...il.com>,
	Chih-Wei Huang <cwhuang@...roid-x86.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Daniel Vetter <daniel.vetter@...el.com>,
	Lee Jones <lee.jones@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	bloften80@...il.com, varkabhadram@...il.com,
	Shobhit Kumar <shobhit.kumar@...el.com>
Subject: [v3 1/7] gpiolib: Add support for removing registered consumer lookup table

In case we unload and load a driver module again that is registering a
lookup table, without this it will result in multiple entries. Provide
an option to remove the lookup table on driver unload

Cc: Samuel Ortiz <sameo@...ux.intel.com>
Cc: Linus Walleij <linus.walleij@...aro.org>
Cc: Alexandre Courbot <gnurou@...il.com>
Cc: Thierry Reding <thierry.reding@...il.com>
Reviewed-by: Alexandre Courbot <acourbot@...dia.com>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Tested-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
Signed-off-by: Shobhit Kumar <shobhit.kumar@...el.com>
---
v2: Ccing maintainers
v3: Correct the subject line (Lee jones)

 drivers/gpio/gpiolib.c       | 13 +++++++++++++
 include/linux/gpio/machine.h |  1 +
 2 files changed, 14 insertions(+)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 957ede5..9d3ea4e 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1675,6 +1675,19 @@ void gpiod_add_lookup_table(struct gpiod_lookup_table *table)
 	mutex_unlock(&gpio_lookup_lock);
 }
 
+/**
+ * gpiod_remove_lookup_table() - unregister GPIO device consumers
+ * @table: table of consumers to unregister
+ */
+void gpiod_remove_lookup_table(struct gpiod_lookup_table *table)
+{
+	mutex_lock(&gpio_lookup_lock);
+
+	list_del(&table->list);
+
+	mutex_unlock(&gpio_lookup_lock);
+}
+
 static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
 				      unsigned int idx,
 				      enum gpio_lookup_flags *flags)
diff --git a/include/linux/gpio/machine.h b/include/linux/gpio/machine.h
index e270614..c0d712d 100644
--- a/include/linux/gpio/machine.h
+++ b/include/linux/gpio/machine.h
@@ -57,5 +57,6 @@ struct gpiod_lookup_table {
 }
 
 void gpiod_add_lookup_table(struct gpiod_lookup_table *table);
+void gpiod_remove_lookup_table(struct gpiod_lookup_table *table);
 
 #endif /* __LINUX_GPIO_MACHINE_H */
-- 
1.9.1

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