pinctrl: stm32: Implement .get_direction gpio_chip callback

Add .get_direction() gpiochip callback in STM32 pinctrl driver.

Signed-off-by: Alexandre TORGUE <alexandre.torgue@st.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

2 files changed, 25 insertions, 3 deletions

diff --git a/drivers/pinctrl/stm32/pinctrl-stm32.c b/drivers/pinctrl/stm32/pinctrl-stm32.c
index 5a15c7deea78..814f76c371c8 100644
--- a/drivers/pinctrl/stm32/pinctrl-stm32.c
+++ b/drivers/pinctrl/stm32/pinctrl-stm32.c
@@ -209,6 +209,24 @@ static int stm32_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
         return irq_create_fwspec_mapping(&fwspec);
 }
 
+static int stm32_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
+{
+        struct stm32_gpio_bank *bank = gpiochip_get_data(chip);
+        int pin = stm32_gpio_pin(offset);
+        int ret;
+        u32 mode, alt;
+
+        stm32_pmx_get_mode(bank, pin, &mode, &alt);
+        if ((alt == 0) && (mode == 0))
+                ret = 1;
+        else if ((alt == 0) && (mode == 1))
+                ret = 0;
+        else
+                ret = -EINVAL;
+
+        return ret;
+}
+
 static const struct gpio_chip stm32_gpio_template = {
         .request                = stm32_gpio_request,
         .free                   = stm32_gpio_free,
@@ -217,6 +235,7 @@ static const struct gpio_chip stm32_gpio_template = {
         .direction_input        = stm32_gpio_direction_input,
         .direction_output       = stm32_gpio_direction_output,
         .to_irq                 = stm32_gpio_to_irq,
+        .get_direction          = stm32_gpio_get_direction,
 };
 
 static int stm32_gpio_irq_request_resources(struct irq_data *irq_data)
@@ -577,8 +596,8 @@ static void stm32_pmx_set_mode(struct stm32_gpio_bank *bank,
         clk_disable(bank->clk);
 }
 
-static void stm32_pmx_get_mode(struct stm32_gpio_bank *bank,
-                int pin, u32 *mode, u32 *alt)
+void stm32_pmx_get_mode(struct stm32_gpio_bank *bank, int pin, u32 *mode,
+                        u32 *alt)
 {
         u32 val;
         int alt_shift = (pin % 8) * 4;
diff --git a/drivers/pinctrl/stm32/pinctrl-stm32.h b/drivers/pinctrl/stm32/pinctrl-stm32.h
index 35ebc94c01e4..8702a9992ce5 100644
--- a/drivers/pinctrl/stm32/pinctrl-stm32.h
+++ b/drivers/pinctrl/stm32/pinctrl-stm32.h
@@ -45,7 +45,10 @@ struct stm32_pinctrl_match_data {
         const unsigned int npins;
 };
 
-int stm32_pctl_probe(struct platform_device *pdev);
+struct stm32_gpio_bank;
 
+int stm32_pctl_probe(struct platform_device *pdev);
+void stm32_pmx_get_mode(struct stm32_gpio_bank *bank,
+                        int pin, u32 *mode, u32 *alt);
 #endif /* __PINCTRL_STM32_H */