[linux-yocto] [PATCH 03/11] gpio-sch: Add sch_gpio_resume_set_enable()

Darren Hart dvhart at linux.intel.com
Sat May 18 14:45:54 PDT 2013


Allow for enabling and disabling of the resume well GPIOs. The E6xx Atom
CPUs multiplex the resume GPIO 2:0 lines with LVDS and individual board
drivers need to be able to enable or disable the lines appropriately.

Unfortunately, the information regarding if the pins are being used for
LVDS or GPIO is board specific and may not be available to the gpio-sch
driver at probe time.

Signed-off-by: Darren Hart <dvhart at linux.intel.com>
---
 drivers/gpio/gpio-sch.c  | 24 ++++++++++++++++++++++++
 include/linux/gpio-sch.h |  6 ++++++
 2 files changed, 30 insertions(+)
 create mode 100644 include/linux/gpio-sch.h

diff --git a/drivers/gpio/gpio-sch.c b/drivers/gpio/gpio-sch.c
index 529c488..52df787 100644
--- a/drivers/gpio/gpio-sch.c
+++ b/drivers/gpio/gpio-sch.c
@@ -41,6 +41,30 @@ static DEFINE_SPINLOCK(gpio_lock);
 
 static unsigned short gpio_ba;
 
+void sch_gpio_resume_set_enable(unsigned gpio_num, int val)
+{
+	u8 curr_en;
+	unsigned short offset, bit;
+
+	spin_lock(&gpio_lock);
+
+	offset = RGEN + gpio_num / 8;
+	bit = gpio_num % 8;
+
+	curr_en = inb(gpio_ba + offset);
+
+	if (val) {
+		if (!(curr_en & (1 << bit)))
+			outb(curr_en | (1 << bit), gpio_ba + offset);
+	} else {
+		if ((curr_en & (1 << bit)))
+			outb(curr_en & ~(1 << bit), gpio_ba + offset);
+	}
+
+	spin_unlock(&gpio_lock);
+}
+EXPORT_SYMBOL_GPL(sch_gpio_resume_set_enable);
+
 static int sch_gpio_core_direction_in(struct gpio_chip *gc, unsigned  gpio_num)
 {
 	u8 curr_dirs;
diff --git a/include/linux/gpio-sch.h b/include/linux/gpio-sch.h
new file mode 100644
index 0000000..79e042f
--- /dev/null
+++ b/include/linux/gpio-sch.h
@@ -0,0 +1,6 @@
+#ifndef _LINUX_GPIO_SCH_
+#define _LINUX_GPIO_SCH_
+
+void sch_gpio_resume_set_enable(unsigned gpio_num, int val);
+
+#endif /* _LINUX_GPIO_SCH_ */
-- 
1.8.1.2




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