On 20. 02. 23, 10:37, Florian Eckert wrote:
Add additional modes to trigger the selected LED.
The following modes are supported:
Tx/Rx: Flash LED on data transmission (default)
CTS: DCE Ready to accept data from the DTE.
DSR: DCE is ready to receive and send data.
CAR: DCE is receiving a carrier from a remote DTE.
RNG: DCE has detected an incoming ring signal.
The mode can be changed for example with the following command:
echo "CTS" > /sys/class/leds/<led>/mode
This would turn on the LED, when the DTE(modem) signals the DCE that it
is ready to accept data.
Signed-off-by: Florian Eckert <fe@xxxxxxxxxx>
--- a/drivers/leds/trigger/ledtrig-tty.c
+++ b/drivers/leds/trigger/ledtrig-tty.c
@@ -7,6 +7,15 @@
#include <linux/tty.h>
#include <uapi/linux/serial.h>
+enum tty_led_mode {
+ TTY_LED_CNT,
+ TTY_LED_CTS,
+ TTY_LED_DSR,
+ TTY_LED_CAR,
+ TTY_LED_RNG,
I would do:
__TTY_LED_LAST = TTY_LED_RNG;
instead of:
+ __TTY_LED_MAX
+};
+
struct ledtrig_tty_data {
struct led_classdev *led_cdev;
struct delayed_work dwork;
@@ -14,6 +23,15 @@ struct ledtrig_tty_data {
const char *ttyname;
struct tty_struct *tty;
int rx, tx;
+ enum tty_led_mode mode;
+};
+
+static const char * const mode[] = {
+ [TTY_LED_CNT] = "Tx/Rx", // Trasmit Data / Receive Data
+ [TTY_LED_CTS] = "CTS", // CTS Clear To Send
+ [TTY_LED_DSR] = "DSR", // DSR Data Set Ready
+ [TTY_LED_CAR] = "CAR", // CAR Data Carrier Detect (DCD)
+ [TTY_LED_RNG] = "RNG", // RNG Ring Indicator (RI)
};
static void ledtrig_tty_restart(struct ledtrig_tty_data *trigger_data)
@@ -21,6 +39,71 @@ static void ledtrig_tty_restart(struct ledtrig_tty_data *trigger_data)
schedule_delayed_work(&trigger_data->dwork, 0);
}
+static ssize_t ledtrig_tty_mode_show(char *buf, enum tty_led_mode tty_mode)
+{
+ int len = 0;
+ int i;
+
+ for (i = 0; i < __TTY_LED_MAX; i++) {
+ bool hit;
+
+ hit = tty_mode == i;
Both the decl and assignment can be on a single line.
+ len += sysfs_emit_at(buf, len, "%s%s%s",
+ hit ? "[" : "",
+ mode[i],
+ hit ? "]" : "");
+
+ if (i < __TTY_LED_MAX - 1)
+ len += sysfs_emit_at(buf, len, " ");
And all this could be then:
for (i = 0; i <= __TTY_LED_LAST; i++) {
bool hit = i == tty_mode;
bool last = i == __TTY_LED_LAST;
len += sysfs_emit_at(buf, len, "%s%s%s%s",
hit ? "[" : "",
mode[i],
hit ? "]" : "",
last ? "" : " ");
}
+ }
+
+ len += sysfs_emit_at(buf, len, "\n");
+
+ return len;
+}
...
+static ssize_t tty_led_mode_store(struct device *dev,
+ struct device_attribute *attr, const char *buf,
+ size_t size)
+{
+ struct ledtrig_tty_data *trigger_data = led_trigger_get_drvdata(dev);
+ ssize_t ret = size;
+ enum tty_led_mode tty_mode = __TTY_LED_MAX;
+ int i;
+
+ /* Check for new line in string*/
+ if (size > 0 && buf[size - 1] == '\n')
+ size -= 1;
+
+ for (i = 0; i < __TTY_LED_MAX; i++) {
+ if (strncmp(buf, mode[i], size) == 0)
+ tty_mode = i;
+ }
+
+ if (tty_mode == __TTY_LED_MAX)
+ return -EINVAL;
Ah, you use __TTY_LED_MAX as an extra value. It doesn't look nice. So
now, what about:
for (i = 0; i <= __TTY_LED_LAST; i++)
if (strncmp(buf, mode[i], size) == 0) {
tty_mode = i;
break;
}
if (i > __TTY_LED_LAST)
return -EINVAL;
?
thanks,
--
js
suse labs
