gpio/nomadik: add function to read GPIO pull down status

Signed-off-by: Rickard Andersson <rickard.andersson@stericsson.com>
Reviewed-by: Martin Persson <martin.persson@stericsson.com>
[Split off from larger patch]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

2 files changed, 32 insertions, 4 deletions

diff --git a/arch/arm/plat-nomadik/include/plat/gpio.h b/arch/arm/plat-nomadik/include/plat/gpio.h
index 1b9f6f0843d1..ea19a5b2f227 100644
--- a/arch/arm/plat-nomadik/include/plat/gpio.h
+++ b/arch/arm/plat-nomadik/include/plat/gpio.h
@@ -78,6 +78,8 @@ extern int nmk_gpio_get_mode(int gpio);
 extern void nmk_gpio_wakeups_suspend(void);
 extern void nmk_gpio_wakeups_resume(void);
 
+extern void nmk_gpio_read_pull(int gpio_bank, u32 *pull_up);
+
 /*
  * Platform data to register a block: only the initial gpio/irq number.
  */
diff --git a/drivers/gpio/gpio-nomadik.c b/drivers/gpio/gpio-nomadik.c
index 380204781f84..4961ef9bc153 100644
--- a/drivers/gpio/gpio-nomadik.c
+++ b/drivers/gpio/gpio-nomadik.c
@@ -57,6 +57,7 @@ struct nmk_gpio_chip {
         u32 fwimsc;
         u32 slpm;
         u32 enabled;
+        u32 pull_up;
 };
 
 static struct nmk_gpio_chip *
@@ -103,16 +104,22 @@ static void __nmk_gpio_set_pull(struct nmk_gpio_chip *nmk_chip,
         u32 pdis;
 
         pdis = readl(nmk_chip->addr + NMK_GPIO_PDIS);
-        if (pull == NMK_GPIO_PULL_NONE)
+        if (pull == NMK_GPIO_PULL_NONE) {
                 pdis |= bit;
-        else
+                nmk_chip->pull_up &= ~bit;
+        } else {
                 pdis &= ~bit;
+        }
+
         writel(pdis, nmk_chip->addr + NMK_GPIO_PDIS);
 
-        if (pull == NMK_GPIO_PULL_UP)
+        if (pull == NMK_GPIO_PULL_UP) {
+                nmk_chip->pull_up |= bit;
                 writel(bit, nmk_chip->addr + NMK_GPIO_DATS);
-        else if (pull == NMK_GPIO_PULL_DOWN)
+        } else if (pull == NMK_GPIO_PULL_DOWN) {
+                nmk_chip->pull_up &= ~bit;
                 writel(bit, nmk_chip->addr + NMK_GPIO_DATC);
+        }
 }
 
 static void __nmk_gpio_make_input(struct nmk_gpio_chip *nmk_chip,
@@ -921,6 +928,25 @@ void nmk_gpio_wakeups_resume(void)
         }
 }
 
+/*
+ * Read the pull up/pull down status.
+ * A bit set in 'pull_up' means that pull up
+ * is selected if pull is enabled in PDIS register.
+ * Note: only pull up/down set via this driver can
+ * be detected due to HW limitations.
+ */
+void nmk_gpio_read_pull(int gpio_bank, u32 *pull_up)
+{
+        if (gpio_bank < NUM_BANKS) {
+                struct nmk_gpio_chip *chip = nmk_gpio_chips[gpio_bank];
+
+                if (!chip)
+                        return;
+
+                *pull_up = chip->pull_up;
+        }
+}
+
 static int __devinit nmk_gpio_probe(struct platform_device *dev)
 {
         struct nmk_gpio_platform_data *pdata = dev->dev.platform_data;