[PATCH 3/4] pinctrl: stm32: Implement .get_direction gpio_chip callback

From: Alexandre TORGUE
Date: Fri Apr 07 2017 - 11:11:35 EST


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

Signed-off-by: Alexandre TORGUE <alexandre.torgue@xxxxxx>

diff --git a/drivers/pinctrl/stm32/pinctrl-stm32.c b/drivers/pinctrl/stm32/pinctrl-stm32.c
index c8825e5..fdde60f 100644
--- a/drivers/pinctrl/stm32/pinctrl-stm32.c
+++ b/drivers/pinctrl/stm32/pinctrl-stm32.c
@@ -25,6 +25,7 @@
#include <linux/regmap.h>
#include <linux/reset.h>
#include <linux/slab.h>
+#include <linux/gpio.h>

#include "../core.h"
#include "../pinconf.h"
@@ -197,6 +198,24 @@ 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 = GPIOF_DIR_IN;
+ else if ((alt == 0) && (mode == 1))
+ ret = GPIOF_DIR_OUT;
+ else
+ ret = -EINVAL;
+
+ return ret;
+}
+
static const struct gpio_chip stm32_gpio_template = {
.request = stm32_gpio_request,
.free = stm32_gpio_free,
@@ -205,6 +224,7 @@ static int stm32_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
.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)
@@ -569,8 +589,8 @@ 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 35ebc94..8702a99 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 */

--
1.9.1