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Diffstat (limited to 'include/linux/gpio/driver.h')
-rw-r--r--include/linux/gpio/driver.h25
1 files changed, 24 insertions, 1 deletions
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index bee976f82788..50882e09289b 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -20,6 +20,18 @@ struct gpio_device;
#ifdef CONFIG_GPIOLIB
/**
+ * enum single_ended_mode - mode for single ended operation
+ * @LINE_MODE_PUSH_PULL: normal mode for a GPIO line, drive actively high/low
+ * @LINE_MODE_OPEN_DRAIN: set line to be open drain
+ * @LINE_MODE_OPEN_SOURCE: set line to be open source
+ */
+enum single_ended_mode {
+ LINE_MODE_PUSH_PULL,
+ LINE_MODE_OPEN_DRAIN,
+ LINE_MODE_OPEN_SOURCE,
+};
+
+/**
* struct gpio_chip - abstract a GPIO controller
* @label: a functional name for the GPIO device, such as a part
* number or the name of the SoC IP-block implementing it.
@@ -38,7 +50,15 @@ struct gpio_device;
* @set: assigns output value for signal "offset"
* @set_multiple: assigns output values for multiple signals defined by "mask"
* @set_debounce: optional hook for setting debounce time for specified gpio in
- * interrupt triggered gpio chips
+ * interrupt triggered gpio chips
+ * @set_single_ended: optional hook for setting a line as open drain, open
+ * source, or non-single ended (restore from open drain/source to normal
+ * push-pull mode) this should be implemented if the hardware supports
+ * open drain or open source settings. The GPIOlib will otherwise try
+ * to emulate open drain/source by not actively driving lines high/low
+ * if a consumer request this. The driver may return -ENOTSUPP if e.g.
+ * it supports just open drain but not open source and is called
+ * with LINE_MODE_OPEN_SOURCE as mode argument.
* @to_irq: optional hook supporting non-static gpio_to_irq() mappings;
* implementation may not sleep
* @dbg_show: optional routine to show contents in debugfs; default code
@@ -130,6 +150,9 @@ struct gpio_chip {
int (*set_debounce)(struct gpio_chip *chip,
unsigned offset,
unsigned debounce);
+ int (*set_single_ended)(struct gpio_chip *chip,
+ unsigned offset,
+ enum single_ended_mode mode);
int (*to_irq)(struct gpio_chip *chip,
unsigned offset);