[PATCH v2 04/11] gpio: stm32: add ops get_dir_flags

[Patrick Delaunay]

Add ops get_dir_flags() to read dir flags from GPIO registers.

Signed-off-by: Patrick Delaunay <patrick.delaunay at st.com>
---

Changes in v2: None

 drivers/gpio/stm32_gpio.c | 59 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/drivers/gpio/stm32_gpio.c b/drivers/gpio/stm32_gpio.c
index f120ee9808..5bff27f75b 100644
--- a/drivers/gpio/stm32_gpio.c
+++ b/drivers/gpio/stm32_gpio.c
@@ -41,6 +41,11 @@ static void stm32_gpio_set_moder(struct stm32_gpio_regs *regs,
 	clrsetbits_le32(&regs->moder, mask, mode << bits_index);
 }
 
+static int stm32_gpio_get_moder(struct stm32_gpio_regs *regs, int idx)
+{
+	return (readl(&regs->moder) >> MODE_BITS(idx)) & MODE_BITS_MASK;
+}
+
 static void stm32_gpio_set_otype(struct stm32_gpio_regs *regs,
 				 int idx,
 				 enum stm32_gpio_otype otype)
@@ -51,6 +56,12 @@ static void stm32_gpio_set_otype(struct stm32_gpio_regs *regs,
 	clrsetbits_le32(&regs->otyper, OTYPE_MSK << bits, otype << bits);
 }
 
+static enum stm32_gpio_otype stm32_gpio_get_otype(struct stm32_gpio_regs *regs,
+						  int idx)
+{
+	return (readl(&regs->otyper) >> OTYPE_BITS(idx)) & OTYPE_MSK;
+}
+
 static void stm32_gpio_set_pupd(struct stm32_gpio_regs *regs,
 				int idx,
 				enum stm32_gpio_pupd pupd)
@@ -61,6 +72,12 @@ static void stm32_gpio_set_pupd(struct stm32_gpio_regs *regs,
 	clrsetbits_le32(&regs->pupdr, PUPD_MASK << bits, pupd << bits);
 }
 
+static enum stm32_gpio_pupd stm32_gpio_get_pupd(struct stm32_gpio_regs *regs,
+						int idx)
+{
+	return (readl(&regs->pupdr) >> PUPD_BITS(idx)) & PUPD_MASK;
+}
+
 /*
  * convert gpio offset to gpio index taking into account gpio holes
  * into gpio bank
@@ -202,6 +219,47 @@ static int stm32_gpio_set_dir_flags(struct udevice *dev, unsigned int offset,
 	return 0;
 }
 
+static int stm32_gpio_get_dir_flags(struct udevice *dev, unsigned int offset,
+				    ulong *flags)
+{
+	struct stm32_gpio_priv *priv = dev_get_priv(dev);
+	struct stm32_gpio_regs *regs = priv->regs;
+	int idx;
+	ulong dir_flags = 0;
+
+	idx = stm32_offset_to_index(dev, offset);
+	if (idx < 0)
+		return idx;
+
+	switch (stm32_gpio_get_moder(regs, idx)) {
+	case STM32_GPIO_MODE_OUT:
+		dir_flags |= GPIOD_IS_OUT;
+		if (stm32_gpio_get_otype(regs, idx) == STM32_GPIO_OTYPE_OD)
+			dir_flags |= GPIOD_OPEN_DRAIN;
+		if (readl(&regs->idr) & BIT(idx))
+			dir_flags |= GPIOD_IS_OUT_ACTIVE;
+		break;
+	case STM32_GPIO_MODE_IN:
+		dir_flags |= GPIOD_IS_IN;
+		switch (stm32_gpio_get_pupd(regs, idx)) {
+		case STM32_GPIO_PUPD_UP:
+			dir_flags |= GPIOD_PULL_UP;
+			break;
+		case STM32_GPIO_PUPD_DOWN:
+			dir_flags |= GPIOD_PULL_DOWN;
+			break;
+		default:
+			break;
+		}
+		break;
+	default:
+		break;
+	}
+	*flags = dir_flags;
+
+	return 0;
+}
+
 static const struct dm_gpio_ops gpio_stm32_ops = {
 	.direction_input	= stm32_gpio_direction_input,
 	.direction_output	= stm32_gpio_direction_output,
@@ -209,6 +267,7 @@ static const struct dm_gpio_ops gpio_stm32_ops = {
 	.set_value		= stm32_gpio_set_value,
 	.get_function		= stm32_gpio_get_function,
 	.set_dir_flags		= stm32_gpio_set_dir_flags,
+	.get_dir_flags		= stm32_gpio_get_dir_flags,
 };
 
 static int gpio_stm32_probe(struct udevice *dev)
-- 
2.17.1