gpio: add API to be strict about GPIO IRQ usage

It is currently often possible in many GPIO drivers to request
a GPIO line to be used as IRQ after calling gpio_to_irq() and,
as the gpiolib is not aware of this, set the same line to
output and start driving it, with undesired side effects.

As it is a bogus usage scenario to request a line flagged as
output to used as IRQ, we introduce APIs to let gpiolib track
the use of a line as IRQ, and also set this flag from the
userspace ABI.

The API is symmetric so that lines can also be flagged from
.irq_enable() and unflagged from IRQ by .irq_disable().
The debugfs file is altered so that we see if a line is
reserved for IRQ.

Cc: Enric Balletbo i Serra <eballetbo@gmail.com>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 86 insertions, 2 deletions

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 4fc28603a742..1014cb5e10b0 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -60,6 +60,7 @@ struct gpio_desc {
 #define FLAG_ACTIVE_LOW 6       /* sysfs value has active low */
 #define FLAG_OPEN_DRAIN 7       /* Gpio is open drain type */
 #define FLAG_OPEN_SOURCE 8      /* Gpio is open source type */
+#define FLAG_USED_AS_IRQ 9      /* GPIO is connected to an IRQ */
 
 #define ID_SHIFT        16      /* add new flags before this one */
 
@@ -96,6 +97,8 @@ static int gpiod_get_value(const struct gpio_desc *desc);
 static void gpiod_set_value(struct gpio_desc *desc, int value);
 static int gpiod_cansleep(const struct gpio_desc *desc);
 static int gpiod_to_irq(const struct gpio_desc *desc);
+static int gpiod_lock_as_irq(struct gpio_desc *desc);
+static void gpiod_unlock_as_irq(struct gpio_desc *desc);
 static int gpiod_export(struct gpio_desc *desc, bool direction_may_change);
 static int gpiod_export_link(struct device *dev, const char *name,
                              struct gpio_desc *desc);
@@ -163,6 +166,17 @@ static struct gpio_desc *gpio_to_desc(unsigned gpio)
 }
 
 /**
+ * Convert an offset on a certain chip to a corresponding descriptor
+ */
+static struct gpio_desc *gpiochip_offset_to_desc(struct gpio_chip *chip,
+                                                 unsigned int offset)
+{
+        unsigned int gpio = chip->base + offset;
+
+        return gpio_to_desc(gpio);
+}
+
+/**
  * Convert a GPIO descriptor to the integer namespace.
  * This should disappear in the future but is needed since we still
  * use GPIO numbers for error messages and sysfs nodes
@@ -428,6 +442,7 @@ static int gpio_setup_irq(struct gpio_desc *desc, struct device *dev,
         desc->flags &= ~GPIO_TRIGGER_MASK;
 
         if (!gpio_flags) {
+                gpiod_unlock_as_irq(desc);
                 ret = 0;
                 goto free_id;
         }
@@ -466,6 +481,12 @@ static int gpio_setup_irq(struct gpio_desc *desc, struct device *dev,
         if (ret < 0)
                 goto free_id;
 
+        ret = gpiod_lock_as_irq(desc);
+        if (ret < 0) {
+                gpiod_warn(desc, "failed to flag the GPIO for IRQ\n");
+                goto free_id;
+        }
+
         desc->flags |= gpio_flags;
         return 0;
 
@@ -1730,6 +1751,14 @@ static int gpiod_direction_output(struct gpio_desc *desc, int value)
                 return -EINVAL;
         }
 
+        /* GPIOs used for IRQs shall not be set as output */
+        if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) {
+                gpiod_err(desc,
+                          "%s: tried to set a GPIO tied to an IRQ as output\n",
+                          __func__);
+                return -EIO;
+        }
+
         /* Open drain pin should not be driven to 1 */
         if (value && test_bit(FLAG_OPEN_DRAIN,  &desc->flags))
                 return gpiod_direction_input(desc);
@@ -2050,6 +2079,58 @@ int __gpio_to_irq(unsigned gpio)
 }
 EXPORT_SYMBOL_GPL(__gpio_to_irq);
 
+/**
+ * gpiod_lock_as_irq() - lock a GPIO to be used as IRQ
+ * @gpio: the GPIO line to lock as used for IRQ
+ *
+ * This is used directly by GPIO drivers that want to lock down
+ * a certain GPIO line to be used as IRQs, for example in the
+ * .to_irq() callback of their gpio_chip, or in the .irq_enable()
+ * of its irq_chip implementation if the GPIO is known from that
+ * code.
+ */
+static int gpiod_lock_as_irq(struct gpio_desc *desc)
+{
+        if (!desc)
+                return -EINVAL;
+
+        if (test_bit(FLAG_IS_OUT, &desc->flags)) {
+                gpiod_err(desc,
+                          "%s: tried to flag a GPIO set as output for IRQ\n",
+                          __func__);
+                return -EIO;
+        }
+
+        set_bit(FLAG_USED_AS_IRQ, &desc->flags);
+        return 0;
+}
+
+int gpio_lock_as_irq(struct gpio_chip *chip, unsigned int offset)
+{
+        return gpiod_lock_as_irq(gpiochip_offset_to_desc(chip, offset));
+}
+EXPORT_SYMBOL_GPL(gpio_lock_as_irq);
+
+/**
+ * gpiod_unlock_as_irq() - unlock a GPIO used as IRQ
+ * @gpio: the GPIO line to unlock from IRQ usage
+ *
+ * This is used directly by GPIO drivers that want to indicate
+ * that a certain GPIO is no longer used exclusively for IRQ.
+ */
+static void gpiod_unlock_as_irq(struct gpio_desc *desc)
+{
+        if (!desc)
+                return;
+
+        clear_bit(FLAG_USED_AS_IRQ, &desc->flags);
+}
+
+void gpio_unlock_as_irq(struct gpio_chip *chip, unsigned int offset)
+{
+        return gpiod_unlock_as_irq(gpiochip_offset_to_desc(chip, offset));
+}
+EXPORT_SYMBOL_GPL(gpio_unlock_as_irq);
 
 /* There's no value in making it easy to inline GPIO calls that may sleep.
  * Common examples include ones connected to I2C or SPI chips.
@@ -2091,6 +2172,7 @@ static void gpiolib_dbg_show(struct seq_file *s, struct gpio_chip *chip)
         unsigned                gpio = chip->base;
         struct gpio_desc        *gdesc = &chip->desc[0];
         int                     is_out;
+        int                     is_irq;
 
         for (i = 0; i < chip->ngpio; i++, gpio++, gdesc++) {
                 if (!test_bit(FLAG_REQUESTED, &gdesc->flags))
@@ -2098,12 +2180,14 @@ static void gpiolib_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 
                 gpiod_get_direction(gdesc);
                 is_out = test_bit(FLAG_IS_OUT, &gdesc->flags);
-                seq_printf(s, " gpio-%-3d (%-20.20s) %s %s",
+                is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags);
+                seq_printf(s, " gpio-%-3d (%-20.20s) %s %s %s",
                         gpio, gdesc->label,
                         is_out ? "out" : "in ",
                         chip->get
                                 ? (chip->get(chip, i) ? "hi" : "lo")
-                                : "?  ");
+                                : "?  ",
+                        is_irq ? "IRQ" : "   ");
                 seq_printf(s, "\n");
         }
 }