gpio: gpiolib: Support for open source/emitter gpios

Adding support for the open source gpio on which client
can specify the open source property through GPIO flag
GPIOF_OPEN_SOURCE at the time of gpio request.
The open source pins are normally pulled low and it
cannot be driven to output with value of 0 and so
when client request for setting the pin to LOW, the
gpio will be set to input direction to make pin in tristate
and hence PULL-DOWN on pins will make the state to LOW.
The open source pin can be driven to HIGH by setting output
with value of 1.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviwed-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 5d25a33..58f40df 100644 (file)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -59,6 +59,7 @@ struct gpio_desc {
 #define FLAG_TRIG_RISE 6       /* trigger on rising edge */
 #define FLAG_ACTIVE_LOW        7       /* sysfs value has active low */
 #define FLAG_OPEN_DRAIN        8       /* Gpio is open drain type */
+#define FLAG_OPEN_SOURCE 9     /* Gpio is open source type */
 
 #define ID_SHIFT       16      /* add new flags before this one */
 
@@ -1266,6 +1267,7 @@ void gpio_free(unsigned gpio)
                clear_bit(FLAG_ACTIVE_LOW, &desc->flags);
                clear_bit(FLAG_REQUESTED, &desc->flags);
                clear_bit(FLAG_OPEN_DRAIN, &desc->flags);
+               clear_bit(FLAG_OPEN_SOURCE, &desc->flags);
        } else
                WARN_ON(extra_checks);
 
@@ -1290,6 +1292,9 @@ int gpio_request_one(unsigned gpio, unsigned long flags, const char *label)
        if (flags & GPIOF_OPEN_DRAIN)
                set_bit(FLAG_OPEN_DRAIN, &gpio_desc[gpio].flags);
 
+       if (flags & GPIOF_OPEN_SOURCE)
+               set_bit(FLAG_OPEN_SOURCE, &gpio_desc[gpio].flags);
+
        if (flags & GPIOF_DIR_IN)
                err = gpio_direction_input(gpio);
        else
@@ -1443,6 +1448,10 @@ int gpio_direction_output(unsigned gpio, int value)
        if (value && test_bit(FLAG_OPEN_DRAIN,  &desc->flags))
                return gpio_direction_input(gpio);
 
+       /* Open source pin should not be driven to 0 */
+       if (!value && test_bit(FLAG_OPEN_SOURCE,  &desc->flags))
+               return gpio_direction_input(gpio);
+
        spin_lock_irqsave(&gpio_lock, flags);
 
        if (!gpio_is_valid(gpio))
@@ -1604,6 +1613,32 @@ static void _gpio_set_open_drain_value(unsigned gpio,
                                        __func__, gpio, err);
 }
 
+/*
+ *  _gpio_set_open_source() - Set the open source gpio's value.
+ * @gpio: Gpio whose state need to be set.
+ * @chip: Gpio chip.
+ * @value: Non-zero for setting it HIGH otherise it will set to LOW.
+ */
+static void _gpio_set_open_source_value(unsigned gpio,
+                       struct gpio_chip *chip, int value)
+{
+       int err = 0;
+       if (value) {
+               err = chip->direction_output(chip, gpio - chip->base, 1);
+               if (!err)
+                       set_bit(FLAG_IS_OUT, &gpio_desc[gpio].flags);
+       } else {
+               err = chip->direction_input(chip, gpio - chip->base);
+               if (!err)
+                       clear_bit(FLAG_IS_OUT, &gpio_desc[gpio].flags);
+       }
+       trace_gpio_direction(gpio, !value, err);
+       if (err < 0)
+               pr_err("%s: Error in set_value for open source gpio%d err %d\n",
+                                       __func__, gpio, err);
+}
+
+
 /**
  * __gpio_set_value() - assign a gpio's value
  * @gpio: gpio whose value will be assigned
@@ -1622,6 +1657,8 @@ void __gpio_set_value(unsigned gpio, int value)
        trace_gpio_value(gpio, 0, value);
        if (test_bit(FLAG_OPEN_DRAIN,  &gpio_desc[gpio].flags))
                _gpio_set_open_drain_value(gpio, chip, value);
+       else if (test_bit(FLAG_OPEN_SOURCE,  &gpio_desc[gpio].flags))
+               _gpio_set_open_source_value(gpio, chip, value);
        else
                chip->set(chip, gpio - chip->base, value);
 }
@@ -1692,6 +1729,8 @@ void gpio_set_value_cansleep(unsigned gpio, int value)
        trace_gpio_value(gpio, 0, value);
        if (test_bit(FLAG_OPEN_DRAIN,  &gpio_desc[gpio].flags))
                _gpio_set_open_drain_value(gpio, chip, value);
+       else if (test_bit(FLAG_OPEN_SOURCE,  &gpio_desc[gpio].flags))
+               _gpio_set_open_source_value(gpio, chip, value);
        else
                chip->set(chip, gpio - chip->base, value);
 }

diff --git a/include/linux/gpio.h b/include/linux/gpio.h
index 66a5b2e..67851bb 100644 (file)
--- a/include/linux/gpio.h
+++ b/include/linux/gpio.h
@@ -17,6 +17,9 @@
 /* Gpio pin is open drain */
 #define GPIOF_OPEN_DRAIN       (1 << 2)
 
+/* Gpio pin is open source */
+#define GPIOF_OPEN_SOURCE      (1 << 3)
+
 /**
  * struct gpio - a structure describing a GPIO with configuration
  * @gpio:      the GPIO number