[PATCH v7 4/4] pps: pps-gpio pps-echo implementation

[Tom Burkart <tom@aussec.com>]

This patch implements the pps echo functionality for pps-gpio, that
sysfs claims is available already.

Configuration is done via device tree bindings.

This patch was originally written by Lukas Senger as part of a masters
thesis project and modified for inclusion into the linux kernel by Tom
Burkart.

Signed-off-by: Lukas Senger <lukas@fridolin.com>
Signed-off-by: Tom Burkart <tom@aussec.com>
---
 drivers/pps/clients/pps-gpio.c | 103 +++++++++++++++++++++++++++++++++++++++--
 include/linux/pps-gpio.h       |   3 ++
 2 files changed, 103 insertions(+), 3 deletions(-)

diff --git a/drivers/pps/clients/pps-gpio.c b/drivers/pps/clients/pps-gpio.c
index aa8b8fb0e9ab..ea035399d56d 100644
--- a/drivers/pps/clients/pps-gpio.c
+++ b/drivers/pps/clients/pps-gpio.c
@@ -36,6 +36,8 @@
 #include <linux/list.h>
 #include <linux/of_device.h>
 #include <linux/of_gpio.h>
+#include <linux/timer.h>
+#include <linux/jiffies.h>
 
 /* Info for each registered platform device */
 struct pps_gpio_device_data {
@@ -43,10 +45,16 @@ struct pps_gpio_device_data {
 	struct pps_device *pps;		/* PPS source device */
 	struct pps_source_info info;	/* PPS source information */
 	struct gpio_desc *gpio_pin;	/* GPIO port descriptors */
+	struct gpio_desc *echo_pin;
+	struct timer_list echo_timer;	/* timer to reset echo active state */
 	bool assert_falling_edge;
 	bool capture_clear;
+	bool enable_pps_echo;
+	bool invert_pps_echo;
 	bool legacy_int_gpio;		/* flag for which ABI to use */
+	unsigned int echo_active_ms;	/* PPS echo active duration */
 	unsigned int gpio_pin_int;	/* GPIO integer ABI */
+	unsigned long echo_timeout;	/* timer timeout value in jiffies */
 };
 
 /*
@@ -70,15 +78,54 @@ static irqreturn_t pps_gpio_irq_handler(int irq, void *data)
 		rising_edge = gpiod_get_value(info->gpio_pin);
 	if ((rising_edge && !info->assert_falling_edge) ||
 			(!rising_edge && info->assert_falling_edge))
-		pps_event(info->pps, &ts, PPS_CAPTUREASSERT, NULL);
+		pps_event(info->pps, &ts, PPS_CAPTUREASSERT, data);
 	else if (info->capture_clear &&
 			((rising_edge && info->assert_falling_edge) ||
 			(!rising_edge && !info->assert_falling_edge)))
-		pps_event(info->pps, &ts, PPS_CAPTURECLEAR, NULL);
+		pps_event(info->pps, &ts, PPS_CAPTURECLEAR, data);
 
 	return IRQ_HANDLED;
 }
 
+static void pps_gpio_echo(struct pps_device *pps, int event, void *data)
+{
+	/* add_timer() needs to write into info->echo_timer */
+	struct pps_gpio_device_data *info;
+
+	info = data;
+
+	switch (event) {
+	case PPS_CAPTUREASSERT:
+		if (pps->params.mode & PPS_ECHOASSERT)
+			gpiod_set_value(info->echo_pin,
+				info->invert_pps_echo ? 0 : 1);
+		break;
+
+	case PPS_CAPTURECLEAR:
+		if (pps->params.mode & PPS_ECHOCLEAR)
+			gpiod_set_value(info->echo_pin,
+				info->invert_pps_echo ? 0 : 1);
+		break;
+	}
+
+	/* fire the timer */
+	if (info->pps->params.mode & (PPS_ECHOASSERT | PPS_ECHOCLEAR)) {
+		info->echo_timer.expires = jiffies + info->echo_timeout;
+		add_timer(&info->echo_timer);
+	}
+}
+
+/* Timer callback to reset the echo pin to the inactive state */
+static void pps_gpio_echo_timer_callback(struct timer_list *t)
+{
+	const struct pps_gpio_device_data *info;
+
+	info = from_timer(info, t, echo_timer);
+
+	gpiod_set_value(info->echo_pin,
+		info->invert_pps_echo ? 1 : 0);
+}
+
 static int pps_gpio_setup(struct platform_device *pdev)
 {
 	struct pps_gpio_device_data *data = platform_get_drvdata(pdev);
@@ -86,14 +133,20 @@ static int pps_gpio_setup(struct platform_device *pdev)
 	struct device_node *np = pdev->dev.of_node;
 	const char *gpio_label;
 	int ret;
+	u32 value;
 
 	if (pdata) {
 		data->gpio_pin_int = pdata->gpio_pin_int;
 		data->gpio_pin = pdata->gpio_pin;
+		data->echo_pin = pdata->echo_pin;
+		if (pdata->echo_pin != NULL)
+			data->enable_pps_echo = true;
 		gpio_label = pdata->gpio_label;
 
 		data->assert_falling_edge = pdata->assert_falling_edge;
 		data->capture_clear = pdata->capture_clear;
+		data->invert_pps_echo = pdata->invert_pps_echo;
+		data->echo_active_ms = pdata->echo_active_ms;
 	} else {
 		if (of_get_property(np, "gpios", NULL)) { /* integer GPIO */
 			data->legacy_int_gpio = true;
@@ -118,11 +171,45 @@ static int pps_gpio_setup(struct platform_device *pdev)
 			}
 		}
 
+		if (of_get_property(np, "echo-gpios", NULL)) {
+			data->enable_pps_echo = true;
+
+			data->echo_pin = devm_gpiod_get(&pdev->dev,
+				"echo",
+				GPIOD_OUT_LOW);
+			if (IS_ERR(data->echo_pin)) {
+				dev_err(&pdev->dev, "failed to request ECHO GPIO\n");
+				return PTR_ERR(data->echo_pin);
+			}
+
+			ret = of_property_read_u32(np,
+				"echo-active-ms",
+				&value);
+			if (ret) {
+				dev_err(&pdev->dev,
+					"failed to get echo-active-ms from OF\n");
+				return ret;
+			}
+			data->echo_active_ms = value;
+		}
+
+
 		if (of_get_property(np, "assert-falling-edge", NULL))
 			data->assert_falling_edge = true;
 
 		if (of_get_property(np, "capture-clear", NULL))
 			data->capture_clear = true;
+
+		if (of_get_property(np, "invert-pps-echo", NULL))
+			data->invert_pps_echo = true;
+	}
+	/* sanity check on echo_active_ms */
+	if (data->enable_pps_echo
+			&& (!data->echo_active_ms || data->echo_active_ms > 999)) {
+		dev_err(&pdev->dev,
+			"echo-active-ms: %u - bad value from OF\n",
+			data->echo_active_ms);
+		return -EINVAL;
 	}
 
 	/* GPIO setup */
@@ -197,6 +284,11 @@ static int pps_gpio_probe(struct platform_device *pdev)
 	data->info.owner = THIS_MODULE;
 	snprintf(data->info.name, PPS_MAX_NAME_LEN - 1, "%s.%d",
 		 pdev->name, pdev->id);
+	if (data->enable_pps_echo) {
+		data->info.echo = pps_gpio_echo;
+		data->echo_timeout = msecs_to_jiffies(data->echo_active_ms);
+		timer_setup(&data->echo_timer, pps_gpio_echo_timer_callback, 0);
+	}
 
 	/* register PPS source */
 	pps_default_params = PPS_CAPTUREASSERT | PPS_OFFSETASSERT;
@@ -229,6 +321,11 @@ static int pps_gpio_remove(struct platform_device *pdev)
 	struct pps_gpio_device_data *data = platform_get_drvdata(pdev);
 
 	pps_unregister_source(data->pps);
+	if (data->enable_pps_echo) {
+		del_timer_sync(&data->echo_timer);
+		/* reset echo pin in any case */
+		gpiod_set_value(data->echo_pin, data->invert_pps_echo ? 1 : 0);
+	}
 	dev_info(&pdev->dev, "removed IRQ %d as PPS source\n", data->irq);
 	return 0;
 }
@@ -253,4 +350,4 @@ MODULE_AUTHOR("Ricardo Martins <rasm@fe.up.pt>");
 MODULE_AUTHOR("James Nuss <jamesnuss@nanometrics.ca>");
 MODULE_DESCRIPTION("Use GPIO pin as PPS source");
 MODULE_LICENSE("GPL");
-MODULE_VERSION("1.1.0");
+MODULE_VERSION("1.2.0");
diff --git a/include/linux/pps-gpio.h b/include/linux/pps-gpio.h
index 86e2081dc7d1..21eceb90187d 100644
--- a/include/linux/pps-gpio.h
+++ b/include/linux/pps-gpio.h
@@ -24,8 +24,11 @@
 
 struct pps_gpio_platform_data {
 	struct gpio_desc *gpio_pin;
+	struct gpio_desc *echo_pin;
 	bool assert_falling_edge;
 	bool capture_clear;
+	bool invert_pps_echo;
+	unsigned int echo_active_ms;
 	unsigned int gpio_pin_int;
 	const char *gpio_label;
 };
-- 
2.12.3