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authorWilliam Breathitt Gray <william.gray@linaro.org>2022-09-27 18:53:38 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2022-09-30 14:32:35 +0200
commit650ae67bbf7ba5ac193f053969612fbb93247b64 (patch)
treebf80c0c98c877ded950722bbb4001d9d264ebb54 /drivers/counter
parent7bbf842cdcff30ddd1da4ab9059cf92f9d1a4326 (diff)
counter: Introduce the Signal polarity component
The Signal polarity component represents the active level of a respective Signal. There are two possible states: positive (rising edge) and negative (falling edge); enum counter_signal_polarity represents these states. A convenience macro COUNTER_COMP_POLARITY() is provided for driver authors to declare a Signal polarity component. Cc: Julien Panis <jpanis@baylibre.com> Link: https://lore.kernel.org/r/8f47d6e1db71a11bb1e2666f8e2a6e9d256d4131.1664204990.git.william.gray@linaro.org/ Signed-off-by: William Breathitt Gray <william.gray@linaro.org> Link: https://lore.kernel.org/r/b6e53438badcb6318997d13dd2fc052f97d808ac.1664318353.git.william.gray@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/counter')
-rw-r--r--drivers/counter/counter-chrdev.c1
-rw-r--r--drivers/counter/counter-sysfs.c12
2 files changed, 13 insertions, 0 deletions
diff --git a/drivers/counter/counter-chrdev.c b/drivers/counter/counter-chrdev.c
index 4e71a19d7e6a..120879ee2e87 100644
--- a/drivers/counter/counter-chrdev.c
+++ b/drivers/counter/counter-chrdev.c
@@ -487,6 +487,7 @@ static int counter_get_data(struct counter_device *const counter,
case COUNTER_COMP_ENUM:
case COUNTER_COMP_COUNT_DIRECTION:
case COUNTER_COMP_COUNT_MODE:
+ case COUNTER_COMP_SIGNAL_POLARITY:
switch (comp_node->component.scope) {
case COUNTER_SCOPE_DEVICE:
ret = comp->device_u32_read(counter, &value_u32);
diff --git a/drivers/counter/counter-sysfs.c b/drivers/counter/counter-sysfs.c
index 04eac41dad33..e5dd36e1a45f 100644
--- a/drivers/counter/counter-sysfs.c
+++ b/drivers/counter/counter-sysfs.c
@@ -91,6 +91,11 @@ static const char *const counter_count_mode_str[] = {
[COUNTER_COUNT_MODE_MODULO_N] = "modulo-n"
};
+static const char *const counter_signal_polarity_str[] = {
+ [COUNTER_SIGNAL_POLARITY_POSITIVE] = "positive",
+ [COUNTER_SIGNAL_POLARITY_NEGATIVE] = "negative"
+};
+
static ssize_t counter_comp_u8_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -201,6 +206,8 @@ static ssize_t counter_comp_u32_show(struct device *dev,
return sysfs_emit(buf, "%s\n", counter_count_direction_str[data]);
case COUNTER_COMP_COUNT_MODE:
return sysfs_emit(buf, "%s\n", counter_count_mode_str[data]);
+ case COUNTER_COMP_SIGNAL_POLARITY:
+ return sysfs_emit(buf, "%s\n", counter_signal_polarity_str[data]);
default:
return sysfs_emit(buf, "%u\n", (unsigned int)data);
}
@@ -252,6 +259,10 @@ static ssize_t counter_comp_u32_store(struct device *dev,
err = counter_find_enum(&data, avail->enums, avail->num_items,
buf, counter_count_mode_str);
break;
+ case COUNTER_COMP_SIGNAL_POLARITY:
+ err = counter_find_enum(&data, avail->enums, avail->num_items,
+ buf, counter_signal_polarity_str);
+ break;
default:
err = kstrtou32(buf, 0, &data);
break;
@@ -469,6 +480,7 @@ static int counter_attr_create(struct device *const dev,
case COUNTER_COMP_ENUM:
case COUNTER_COMP_COUNT_DIRECTION:
case COUNTER_COMP_COUNT_MODE:
+ case COUNTER_COMP_SIGNAL_POLARITY:
if (comp->device_u32_read) {
dev_attr->attr.mode |= 0444;
dev_attr->show = counter_comp_u32_show;