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authorLukas Wunner <lukas@wunner.de>2017-10-12 13:40:10 +0300
committerLinus Walleij <linus.walleij@linaro.org>2017-10-19 23:32:39 +0300
commiteec1d566cdf94b57e8f5ba9fe60eea214929bcfc (patch)
treef10fab2d393d231f711123fcf66c1b01fc893370 /Documentation/gpio
parent5307e2ad69ab3b0e0622fdf8b254c1d4565eb924 (diff)
downloadlinux-eec1d566cdf94b57e8f5ba9fe60eea214929bcfc.tar.xz
gpio: Introduce ->get_multiple callback
SPI-attached GPIO controllers typically read out all inputs in one go. If callers desire the values of multipe inputs, ideally a single readout should take place to return the desired values. However the current driver API only offers a ->get callback but no ->get_multiple (unlike ->set_multiple, which is present). Thus, to read multiple inputs, a full readout needs to be performed for every single value (barring driver-internal caching), which is inefficient. In fact, the lack of a ->get_multiple callback has been bemoaned repeatedly by the gpio subsystem maintainer: http://www.spinics.net/lists/linux-gpio/msg10571.html http://www.spinics.net/lists/devicetree/msg121734.html Introduce the missing callback. Add corresponding consumer functions such as gpiod_get_array_value(). Amend linehandle_ioctl() to take advantage of the newly added infrastructure. Update the documentation. Cc: Rojhalat Ibrahim <imr@rtschenk.de> Signed-off-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'Documentation/gpio')
-rw-r--r--Documentation/gpio/consumer.txt41
1 files changed, 30 insertions, 11 deletions
diff --git a/Documentation/gpio/consumer.txt b/Documentation/gpio/consumer.txt
index ddbfa775a78a..63e1bd1d88e3 100644
--- a/Documentation/gpio/consumer.txt
+++ b/Documentation/gpio/consumer.txt
@@ -295,9 +295,22 @@ as possible, especially by drivers which should not care about the actual
physical line level and worry about the logical value instead.
-Set multiple GPIO outputs with a single function call
------------------------------------------------------
-The following functions set the output values of an array of GPIOs:
+Access multiple GPIOs with a single function call
+-------------------------------------------------
+The following functions get or set the values of an array of GPIOs:
+
+ int gpiod_get_array_value(unsigned int array_size,
+ struct gpio_desc **desc_array,
+ int *value_array);
+ int gpiod_get_raw_array_value(unsigned int array_size,
+ struct gpio_desc **desc_array,
+ int *value_array);
+ int gpiod_get_array_value_cansleep(unsigned int array_size,
+ struct gpio_desc **desc_array,
+ int *value_array);
+ int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
+ struct gpio_desc **desc_array,
+ int *value_array);
void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
@@ -312,34 +325,40 @@ The following functions set the output values of an array of GPIOs:
struct gpio_desc **desc_array,
int *value_array)
-The array can be an arbitrary set of GPIOs. The functions will try to set
+The array can be an arbitrary set of GPIOs. The functions will try to access
GPIOs belonging to the same bank or chip simultaneously if supported by the
corresponding chip driver. In that case a significantly improved performance
-can be expected. If simultaneous setting is not possible the GPIOs will be set
-sequentially.
+can be expected. If simultaneous access is not possible the GPIOs will be
+accessed sequentially.
-The gpiod_set_array() functions take three arguments:
+The functions take three arguments:
* array_size - the number of array elements
* desc_array - an array of GPIO descriptors
- * value_array - an array of values to assign to the GPIOs
+ * value_array - an array to store the GPIOs' values (get) or
+ an array of values to assign to the GPIOs (set)
The descriptor array can be obtained using the gpiod_get_array() function
or one of its variants. If the group of descriptors returned by that function
-matches the desired group of GPIOs, those GPIOs can be set by simply using
+matches the desired group of GPIOs, those GPIOs can be accessed by simply using
the struct gpio_descs returned by gpiod_get_array():
struct gpio_descs *my_gpio_descs = gpiod_get_array(...);
gpiod_set_array_value(my_gpio_descs->ndescs, my_gpio_descs->desc,
my_gpio_values);
-It is also possible to set a completely arbitrary array of descriptors. The
+It is also possible to access a completely arbitrary array of descriptors. The
descriptors may be obtained using any combination of gpiod_get() and
gpiod_get_array(). Afterwards the array of descriptors has to be setup
-manually before it can be used with gpiod_set_array().
+manually before it can be passed to one of the above functions.
Note that for optimal performance GPIOs belonging to the same chip should be
contiguous within the array of descriptors.
+The return value of gpiod_get_array_value() and its variants is 0 on success
+or negative on error. Note the difference to gpiod_get_value(), which returns
+0 or 1 on success to convey the GPIO value. With the array functions, the GPIO
+values are stored in value_array rather than passed back as return value.
+
GPIOs mapped to IRQs
--------------------