path: root/recipes-kernel/linux/linux-3.12.27/linux-3.12-gpio-expose-pullups.patch

Index: linux-3.12.13/drivers/gpio/gpiolib.c
===================================================================
--- linux-3.12.13.orig/drivers/gpio/gpiolib.c	2014-02-22 15:32:50.000000000 -0600
+++ linux-3.12.13/drivers/gpio/gpiolib.c	2014-04-18 09:25:31.977377592 -0500
@@ -87,7 +87,9 @@
 static int gpiod_request(struct gpio_desc *desc, const char *label);
 static void gpiod_free(struct gpio_desc *desc);
 static int gpiod_direction_input(struct gpio_desc *desc);
+static int gpiod_direction_input_pullup(struct gpio_desc *desc, bool pullup);
 static int gpiod_direction_output(struct gpio_desc *desc, int value);
+static int gpiod_direction_output_pullup(struct gpio_desc *desc, int value, bool pullup);
 static int gpiod_get_direction(const struct gpio_desc *desc);
 static int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);
 static int gpiod_get_value_cansleep(const struct gpio_desc *desc);
@@ -1523,11 +1525,19 @@
 	if (flags & GPIOF_OPEN_SOURCE)
 		set_bit(FLAG_OPEN_SOURCE, &desc->flags);
 
-	if (flags & GPIOF_DIR_IN)
-		err = gpiod_direction_input(desc);
-	else
-		err = gpiod_direction_output(desc,
-				(flags & GPIOF_INIT_HIGH) ? 1 : 0);
+	if (flags & GPIOF_DIR_IN) {
+		if (flags & GPIOF_PULLUP)
+			err = gpiod_direction_input_pullup(desc, (flags & GPIOF_PULLUP) ? true : false);
+		else
+			err = gpiod_direction_input(desc);
+	} else {
+		if (flags & GPIOF_PULLUP)
+			err = gpiod_direction_output_pullup(desc,
+					(flags & GPIOF_INIT_HIGH) ? 1 : 0, (flags & GPIOF_PULLUP) ? true : false);
+		else
+			err = gpiod_direction_output(desc,
+					(flags & GPIOF_INIT_HIGH) ? 1 : 0);
+	}
 
 	if (err)
 		goto free_gpio;
@@ -1613,6 +1623,71 @@
 }
 EXPORT_SYMBOL_GPL(gpiochip_is_requested);
 
+static int gpiod_direction_input_pullup(struct gpio_desc *desc, bool pullup)
+{
+	unsigned long		flags;
+	struct gpio_chip	*chip;
+	int			status = -EINVAL;
+	int			offset;
+
+	if (!desc || !desc->chip) {
+		pr_warn("%s: invalid GPIO\n", __func__);
+		return -EINVAL;
+	}
+
+	chip = desc->chip;
+	if (!chip->get || !chip->direction_input_pullup) {
+		pr_warn("%s: missing get() or direction_input_pullup() operations\n",
+			__func__);
+		return -EIO;
+	}
+
+	spin_lock_irqsave(&gpio_lock, flags);
+
+	status = gpio_ensure_requested(desc);
+	if (status < 0)
+		goto fail;
+
+	/* now we know the gpio is valid and chip won't vanish */
+
+	spin_unlock_irqrestore(&gpio_lock, flags);
+
+	might_sleep_if(chip->can_sleep);
+
+	offset = gpio_chip_hwgpio(desc);
+	if (status) {
+		status = chip->request(chip, offset);
+		if (status < 0) {
+			pr_debug("GPIO-%d: chip request fail, %d\n",
+				desc_to_gpio(desc), status);
+			/* and it's not available to anyone else ...
+			 * gpio_request() is the fully clean solution.
+			 */
+			goto lose;
+		}
+	}
+
+	status = chip->direction_input_pullup(chip, offset, pullup);
+	if (status == 0)
+		clear_bit(FLAG_IS_OUT, &desc->flags);
+
+	trace_gpio_direction(desc_to_gpio(desc), 1, status);
+lose:
+	return status;
+fail:
+	spin_unlock_irqrestore(&gpio_lock, flags);
+	if (status)
+		pr_debug("%s: gpio-%d status %d\n", __func__,
+			 desc_to_gpio(desc), status);
+	return status;
+}
+
+int gpio_direction_input_pullup(unsigned gpio, bool pullup)
+{
+	return gpiod_direction_input_pullup(gpio_to_desc(gpio), pullup);
+}
+EXPORT_SYMBOL_GPL(gpio_direction_input_pullup);
+
 
 /* Drivers MUST set GPIO direction before making get/set calls.  In
  * some cases this is done in early boot, before IRQs are enabled.
@@ -1688,6 +1763,79 @@
 }
 EXPORT_SYMBOL_GPL(gpio_direction_input);
 
+static int gpiod_direction_output_pullup(struct gpio_desc *desc, int value, bool pullup)
+{
+	unsigned long		flags;
+	struct gpio_chip	*chip;
+	int			status = -EINVAL;
+	int offset;
+
+	if (!desc || !desc->chip) {
+		pr_warn("%s: invalid GPIO\n", __func__);
+		return -EINVAL;
+	}
+
+	/* Open drain pin should not be driven to 1 */
+	if (value && test_bit(FLAG_OPEN_DRAIN,  &desc->flags))
+		return gpiod_direction_input(desc);
+
+	/* Open source pin should not be driven to 0 */
+	if (!value && test_bit(FLAG_OPEN_SOURCE,  &desc->flags))
+		return gpiod_direction_input(desc);
+
+	chip = desc->chip;
+	if (!chip->set || !chip->direction_output_pullup) {
+		pr_warn("%s: missing set() or direction_output_pullup() operations\n",
+			__func__);
+		return -EIO;
+	}
+
+	spin_lock_irqsave(&gpio_lock, flags);
+
+	status = gpio_ensure_requested(desc);
+	if (status < 0)
+		goto fail;
+
+	/* now we know the gpio is valid and chip won't vanish */
+
+	spin_unlock_irqrestore(&gpio_lock, flags);
+
+	might_sleep_if(chip->can_sleep);
+
+	offset = gpio_chip_hwgpio(desc);
+	if (status) {
+		status = chip->request(chip, offset);
+		if (status < 0) {
+			pr_debug("GPIO-%d: chip request fail, %d\n",
+				desc_to_gpio(desc), status);
+			/* and it's not available to anyone else ...
+			 * gpio_request() is the fully clean solution.
+			 */
+			goto lose;
+		}
+	}
+
+	status = chip->direction_output_pullup(chip, offset, value, pullup);
+	if (status == 0)
+		set_bit(FLAG_IS_OUT, &desc->flags);
+	trace_gpio_value(desc_to_gpio(desc), 0, value);
+	trace_gpio_direction(desc_to_gpio(desc), 0, status);
+lose:
+	return status;
+fail:
+	spin_unlock_irqrestore(&gpio_lock, flags);
+	if (status)
+		pr_debug("%s: gpio-%d status %d\n", __func__,
+			 desc_to_gpio(desc), status);
+	return status;
+}
+
+int gpio_direction_output_pullup(unsigned gpio, int value, bool pullup)
+{
+	return gpiod_direction_output_pullup(gpio_to_desc(gpio), value, pullup);
+}
+EXPORT_SYMBOL_GPL(gpio_direction_output_pullup);
+
 static int gpiod_direction_output(struct gpio_desc *desc, int value)
 {
 	unsigned long		flags;
Index: linux-3.12.13/drivers/pinctrl/pinctrl-at91.c
===================================================================
--- linux-3.12.13.orig/drivers/pinctrl/pinctrl-at91.c	2014-02-22 15:32:50.000000000 -0600
+++ linux-3.12.13/drivers/pinctrl/pinctrl-at91.c	2014-04-18 09:25:31.985377595 -0500
@@ -1112,6 +1112,17 @@
 	return 0;
 }
 
+static int at91_gpio_direction_input_pullup(struct gpio_chip *chip, unsigned offset, bool pullup)
+{
+	struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
+	void __iomem *pio = at91_gpio->regbase;
+	unsigned mask = 1 << offset;
+
+	writel_relaxed(mask, pio + PIO_ODR);
+	at91_mux_set_pullup(pio, mask, pullup);
+	return 0;
+}
+
 static int at91_gpio_get(struct gpio_chip *chip, unsigned offset)
 {
 	struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
@@ -1146,6 +1157,20 @@
 	return 0;
 }
 
+static int at91_gpio_direction_output_pullup(struct gpio_chip *chip, unsigned offset,
+				int val, bool pullup)
+{
+	struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
+	void __iomem *pio = at91_gpio->regbase;
+	unsigned mask = 1 << offset;
+
+	writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR));
+	writel_relaxed(mask, pio + PIO_OER);
+	at91_mux_set_pullup(pio, mask, pullup);
+
+	return 0;
+}
+
 static int at91_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
 {
 	struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
@@ -1513,8 +1538,10 @@
 	.request		= at91_gpio_request,
 	.free			= at91_gpio_free,
 	.direction_input	= at91_gpio_direction_input,
+	.direction_input_pullup = at91_gpio_direction_input_pullup,
 	.get			= at91_gpio_get,
 	.direction_output	= at91_gpio_direction_output,
+	.direction_output_pullup	= at91_gpio_direction_output_pullup,
 	.set			= at91_gpio_set,
 	.to_irq			= at91_gpio_to_irq,
 	.dbg_show		= at91_gpio_dbg_show,
Index: linux-3.12.13/include/linux/gpio.h
===================================================================
--- linux-3.12.13.orig/include/linux/gpio.h	2014-02-22 15:32:50.000000000 -0600
+++ linux-3.12.13/include/linux/gpio.h	2014-04-18 09:25:31.957377594 -0500
@@ -12,7 +12,10 @@
 #define GPIOF_INIT_LOW	(0 << 1)
 #define GPIOF_INIT_HIGH	(1 << 1)
 
+#define GPIOF_PULLUP		(2 << 0)
+
 #define GPIOF_IN		(GPIOF_DIR_IN)
+#define GPIOF_IN_PULLUP			(GPIOF_DIR_IN | GPIOF_PULLUP)
 #define GPIOF_OUT_INIT_LOW	(GPIOF_DIR_OUT | GPIOF_INIT_LOW)
 #define GPIOF_OUT_INIT_HIGH	(GPIOF_DIR_OUT | GPIOF_INIT_HIGH)
 
Index: linux-3.12.13/include/asm-generic/gpio.h
===================================================================
--- linux-3.12.13.orig/include/asm-generic/gpio.h	2014-02-22 15:32:50.000000000 -0600
+++ linux-3.12.13/include/asm-generic/gpio.h	2014-04-18 09:26:42.669377408 -0500
@@ -62,9 +62,11 @@
  * @get_direction: returns direction for signal "offset", 0=out, 1=in,
  *	(same as GPIOF_DIR_XXX), or negative error
  * @direction_input: configures signal "offset" as input, or returns error
+ * @direction_input_pullup: configures signal "offset" as input with pullup enabled, or returns error
  * @get: returns value for signal "offset"; for output signals this
  *	returns either the value actually sensed, or zero
  * @direction_output: configures signal "offset" as output, or returns error
+ * @direction_output_pullup: configures signal "offset" as output with pullup enabled, or returns error
  * @set_debounce: optional hook for setting debounce time for specified gpio in
  *      interrupt triggered gpio chips
  * @set: assigns output value for signal "offset"
@@ -111,10 +113,14 @@
 						unsigned offset);
 	int			(*direction_input)(struct gpio_chip *chip,
 						unsigned offset);
+	int			(*direction_input_pullup)(struct gpio_chip *chip,
+						unsigned offset, bool pullup);
 	int			(*get)(struct gpio_chip *chip,
 						unsigned offset);
 	int			(*direction_output)(struct gpio_chip *chip,
 						unsigned offset, int value);
+	int			(*direction_output_pullup)(struct gpio_chip *chip,
+						unsigned offset, int value, bool pullup);
 	int			(*set_debounce)(struct gpio_chip *chip,
 						unsigned offset, unsigned debounce);
 
@@ -173,7 +179,9 @@
 extern void gpio_free(unsigned gpio);
 
 extern int gpio_direction_input(unsigned gpio);
+extern int gpio_direction_input_pullup(unsigned gpio, bool pullup);
 extern int gpio_direction_output(unsigned gpio, int value);
+extern int gpio_direction_output_pullup(unsigned gpio, int value, bool pullup);
 
 extern int gpio_set_debounce(unsigned gpio, unsigned debounce);