gpio: Use new GPIO_LINE_DIRECTION

It's hard for occasional GPIO code reader/writer to know if values 0/1
equal to IN or OUT. Use defined GPIO_LINE_DIRECTION_IN and
GPIO_LINE_DIRECTION_OUT to help them out.

NOTE - for gpio-amd-fch and gpio-bd9571mwv:
This commit also changes the return value for direction get to equal 1
for direction INPUT. Prior this commit these drivers might have
returned some other positive value but 1 for INPUT.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Acked-by: Scott Branden <scott.branden@broadcom.com>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Reviewed-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Acked-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-104-dio-48e.c

@@ -59,7 +59,10 @@ static int dio48e_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
 	const unsigned port = offset / 8;
 	const unsigned mask = BIT(offset % 8);
 
-	return !!(dio48egpio->io_state[port] & mask);
+	if (dio48egpio->io_state[port] & mask)
+		return  GPIO_LINE_DIRECTION_IN;
+
+	return GPIO_LINE_DIRECTION_OUT;
 }
 
 static int dio48e_gpio_direction_input(struct gpio_chip *chip, unsigned offset)

drivers/gpio/gpio-104-idi-48.c

@@ -53,7 +53,7 @@ struct idi_48_gpio {
 
 static int idi_48_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
 {
-	return 1;
+	return GPIO_LINE_DIRECTION_IN;
 }
 
 static int idi_48_gpio_direction_input(struct gpio_chip *chip, unsigned offset)

drivers/gpio/gpio-104-idio-16.c

@@ -51,9 +51,9 @@ struct idio_16_gpio {
 static int idio_16_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
 {
 	if (offset > 15)
-		return 1;
+		return GPIO_LINE_DIRECTION_IN;
 
-	return 0;
+	return GPIO_LINE_DIRECTION_OUT;
 }
 
 static int idio_16_gpio_direction_input(struct gpio_chip *chip, unsigned offset)

drivers/gpio/gpio-74xx-mmio.c

@@ -77,7 +77,10 @@ static int mmio_74xx_get_direction(struct gpio_chip *gc, unsigned offset)
 {
 	struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);
 
-	return !(priv->flags & MMIO_74XX_DIR_OUT);
+	if (priv->flags & MMIO_74XX_DIR_OUT)
+		return GPIO_LINE_DIRECTION_OUT;
+
+	return  GPIO_LINE_DIRECTION_IN;
 }
 
 static int mmio_74xx_dir_in(struct gpio_chip *gc, unsigned int gpio)

drivers/gpio/gpio-amd-fch.c

@@ -92,7 +92,7 @@ static int amd_fch_gpio_get_direction(struct gpio_chip *gc, unsigned int gpio)
 	ret = (readl_relaxed(ptr) & AMD_FCH_GPIO_FLAG_DIRECTION);
 	spin_unlock_irqrestore(&priv->lock, flags);
 
-	return ret;
+	return ret ? GPIO_LINE_DIRECTION_IN : GPIO_LINE_DIRECTION_OUT;
 }
 
 static void amd_fch_gpio_set(struct gpio_chip *gc,

drivers/gpio/gpio-aspeed.c

@@ -487,10 +487,10 @@ static int aspeed_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
 	u32 val;
 
 	if (!have_input(gpio, offset))
-		return 0;
+		return GPIO_LINE_DIRECTION_OUT;
 
 	if (!have_output(gpio, offset))
-		return 1;
+		return GPIO_LINE_DIRECTION_IN;
 
 	spin_lock_irqsave(&gpio->lock, flags);
 
@@ -498,8 +498,7 @@ static int aspeed_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
 
 	spin_unlock_irqrestore(&gpio->lock, flags);
 
-	return !val;
-
+	return val ? GPIO_LINE_DIRECTION_OUT : GPIO_LINE_DIRECTION_IN;
 }
 
 static inline int irqd_to_aspeed_gpio_data(struct irq_data *d,

drivers/gpio/gpio-bcm-kona.c

@@ -127,7 +127,7 @@ static int bcm_kona_gpio_get_dir(struct gpio_chip *chip, unsigned gpio)
 	u32 val;
 
 	val = readl(reg_base + GPIO_CONTROL(gpio)) & GPIO_GPCTR0_IOTR_MASK;
-	return !!val;
+	return val ? GPIO_LINE_DIRECTION_IN : GPIO_LINE_DIRECTION_OUT;
 }
 
 static void bcm_kona_gpio_set(struct gpio_chip *chip, unsigned gpio, int value)
@@ -144,7 +144,7 @@ static void bcm_kona_gpio_set(struct gpio_chip *chip, unsigned gpio, int value)
 	raw_spin_lock_irqsave(&kona_gpio->lock, flags);
 
 	/* this function only applies to output pin */
-	if (bcm_kona_gpio_get_dir(chip, gpio) == 1)
+	if (bcm_kona_gpio_get_dir(chip, gpio) == GPIO_LINE_DIRECTION_IN)
 		goto out;
 
 	reg_offset = value ? GPIO_OUT_SET(bank_id) : GPIO_OUT_CLEAR(bank_id);
@@ -170,7 +170,7 @@ static int bcm_kona_gpio_get(struct gpio_chip *chip, unsigned gpio)
 	reg_base = kona_gpio->reg_base;
 	raw_spin_lock_irqsave(&kona_gpio->lock, flags);
 
-	if (bcm_kona_gpio_get_dir(chip, gpio) == 1)
+	if (bcm_kona_gpio_get_dir(chip, gpio) == GPIO_LINE_DIRECTION_IN)
 		reg_offset = GPIO_IN_STATUS(bank_id);
 	else
 		reg_offset = GPIO_OUT_STATUS(bank_id);

drivers/gpio/gpio-bd70528.c

@@ -54,8 +54,10 @@ static int bd70528_get_direction(struct gpio_chip *chip, unsigned int offset)
 		dev_err(bdgpio->chip.dev, "Could not read gpio direction\n");
 		return ret;
 	}
+	if (val & BD70528_GPIO_OUT_EN_MASK)
+		return GPIO_LINE_DIRECTION_OUT;
 
-	return !(val & BD70528_GPIO_OUT_EN_MASK);
+	return GPIO_LINE_DIRECTION_IN;
 }
 
 static int bd70528_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
@@ -166,9 +168,9 @@ static int bd70528_gpio_get(struct gpio_chip *chip, unsigned int offset)
 	 * locking would make no sense.
 	 */
 	ret = bd70528_get_direction(chip, offset);
-	if (ret == 0)
+	if (ret == GPIO_LINE_DIRECTION_OUT)
 		ret = bd70528_gpio_get_o(bdgpio, offset);
-	else if (ret == 1)
+	else if (ret == GPIO_LINE_DIRECTION_IN)
 		ret = bd70528_gpio_get_i(bdgpio, offset);
 	else
 		dev_err(bdgpio->chip.dev, "failed to read GPIO direction\n");

drivers/gpio/gpio-bd9571mwv.c

@@ -37,8 +37,10 @@ static int bd9571mwv_gpio_get_direction(struct gpio_chip *chip,
 	ret = regmap_read(gpio->bd->regmap, BD9571MWV_GPIO_DIR, &val);
 	if (ret < 0)
 		return ret;
+	if (val & BIT(offset))
+		return GPIO_LINE_DIRECTION_IN;
 
-	return val & BIT(offset);
+	return GPIO_LINE_DIRECTION_OUT;
 }
 
 static int bd9571mwv_gpio_direction_input(struct gpio_chip *chip,

drivers/gpio/gpio-dln2.c

@@ -200,9 +200,9 @@ static int dln2_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
 	struct dln2_gpio *dln2 = gpiochip_get_data(chip);
 
 	if (test_bit(offset, dln2->output_enabled))
-		return 0;
+		return GPIO_LINE_DIRECTION_OUT;
 
-	return 1;
+	return GPIO_LINE_DIRECTION_IN;
 }
 
 static int dln2_gpio_get(struct gpio_chip *chip, unsigned int offset)
@@ -214,7 +214,7 @@ static int dln2_gpio_get(struct gpio_chip *chip, unsigned int offset)
 	if (dir < 0)
 		return dir;
 
-	if (dir == 1)
+	if (dir == GPIO_LINE_DIRECTION_IN)
 		return dln2_gpio_pin_get_in_val(dln2, offset);
 
 	return dln2_gpio_pin_get_out_val(dln2, offset);

drivers/gpio/gpio-exar.c

@@ -77,7 +77,10 @@ static int exar_get_direction(struct gpio_chip *chip, unsigned int offset)
 		EXAR_OFFSET_MPIOSEL_HI : EXAR_OFFSET_MPIOSEL_LO;
 	unsigned int bit  = (offset + exar_gpio->first_pin) % 8;
 
-	return !!(exar_get(chip, addr) & BIT(bit));
+	if (exar_get(chip, addr) & BIT(bit))
+		return GPIO_LINE_DIRECTION_IN;
+
+	return GPIO_LINE_DIRECTION_OUT;
 }
 
 static int exar_get_value(struct gpio_chip *chip, unsigned int offset)

drivers/gpio/gpio-f7188x.c

@@ -250,7 +250,10 @@ static int f7188x_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
 
 	superio_exit(sio->addr);
 
-	return !(dir & 1 << offset);
+	if (dir & 1 << offset)
+		return GPIO_LINE_DIRECTION_OUT;
+
+	return GPIO_LINE_DIRECTION_IN;
 }
 
 static int f7188x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)

drivers/gpio/gpio-gpio-mm.c

@@ -52,7 +52,10 @@ static int gpiomm_gpio_get_direction(struct gpio_chip *chip,
 	const unsigned int port = offset / 8;
 	const unsigned int mask = BIT(offset % 8);
 
-	return !!(gpiommgpio->io_state[port] & mask);
+	if (gpiommgpio->io_state[port] & mask)
+		return GPIO_LINE_DIRECTION_IN;
+
+	return GPIO_LINE_DIRECTION_OUT;
 }
 
 static int gpiomm_gpio_direction_input(struct gpio_chip *chip,

drivers/gpio/gpio-htc-egpio.c

@@ -220,7 +220,10 @@ static int egpio_get_direction(struct gpio_chip *chip, unsigned offset)
 
 	egpio = gpiochip_get_data(chip);
 
-	return !test_bit(offset, &egpio->is_out);
+	if (test_bit(offset, &egpio->is_out))
+		return GPIO_LINE_DIRECTION_OUT;
+
+	return GPIO_LINE_DIRECTION_IN;
 }
 
 static void egpio_write_cache(struct egpio_info *ei)

drivers/gpio/gpio-ich.c

@@ -159,7 +159,10 @@ static bool ichx_gpio_check_available(struct gpio_chip *gpio, unsigned nr)
 
 static int ichx_gpio_get_direction(struct gpio_chip *gpio, unsigned nr)
 {
-	return ichx_read_bit(GPIO_IO_SEL, nr);
+	if (ichx_read_bit(GPIO_IO_SEL, nr))
+		return GPIO_LINE_DIRECTION_IN;
+
+	return GPIO_LINE_DIRECTION_OUT;
 }
 
 static int ichx_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)

drivers/gpio/gpio-kempld.c

@@ -104,7 +104,10 @@ static int kempld_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
 	struct kempld_gpio_data *gpio = gpiochip_get_data(chip);
 	struct kempld_device_data *pld = gpio->pld;
 
-	return !kempld_gpio_get_bit(pld, KEMPLD_GPIO_DIR_NUM(offset), offset);
+	if (kempld_gpio_get_bit(pld, KEMPLD_GPIO_DIR_NUM(offset), offset))
+		return GPIO_LINE_DIRECTION_OUT;
+
+	return GPIO_LINE_DIRECTION_IN;
 }
 
 static int kempld_gpio_pincount(struct kempld_device_data *pld)

drivers/gpio/gpio-lp873x.c

@@ -33,7 +33,7 @@ static int lp873x_gpio_get_direction(struct gpio_chip *chip,
 				     unsigned int offset)
 {
 	/* This device is output only */
-	return 0;
+	return GPIO_LINE_DIRECTION_OUT;
 }
 
 static int lp873x_gpio_direction_input(struct gpio_chip *chip,

drivers/gpio/gpio-lp87565.c

@@ -57,7 +57,10 @@ static int lp87565_gpio_get_direction(struct gpio_chip *chip,
 	if (ret < 0)
 		return ret;
 
-	return !(val & BIT(offset));
+	if (val & BIT(offset))
+		return GPIO_LINE_DIRECTION_OUT;
+
+	return GPIO_LINE_DIRECTION_IN;
 }
 
 static int lp87565_gpio_direction_input(struct gpio_chip *chip,

drivers/gpio/gpio-madera.c

@@ -34,7 +34,10 @@ static int madera_gpio_get_direction(struct gpio_chip *chip,
 	if (ret < 0)
 		return ret;
 
-	return !!(val & MADERA_GP1_DIR_MASK);
+	if (val & MADERA_GP1_DIR_MASK)
+		return GPIO_LINE_DIRECTION_IN;
+
+	return GPIO_LINE_DIRECTION_OUT;
 }
 
 static int madera_gpio_direction_in(struct gpio_chip *chip, unsigned int offset)

drivers/gpio/gpio-max3191x.c

@@ -94,7 +94,7 @@ DECLARE_CRC8_TABLE(max3191x_crc8);
 
 static int max3191x_get_direction(struct gpio_chip *gpio, unsigned int offset)
 {
-	return 1; /* always in */
+	return GPIO_LINE_DIRECTION_IN; /* always in */
 }
 
 static int max3191x_direction_input(struct gpio_chip *gpio, unsigned int offset)