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Subject[PATCH v7 2/4] pps: descriptor-based gpio, capture-clear addition
Date
This patch changes the GPIO access for the pps-gpio driver from the
integer based ABI to the descriptor based ABI. It also adds
documentation for the device tree capture-clear option and
device tree capture-clear extraction. The legacy device tree
entry for the GPIO pin is supported.

Signed-off-by: Tom Burkart <tom@aussec.com>
---
drivers/pps/clients/pps-gpio.c | 124 ++++++++++++++++++++++++++++-------------
include/linux/pps-gpio.h | 3 +-
2 files changed, 86 insertions(+), 41 deletions(-)

diff --git a/drivers/pps/clients/pps-gpio.c b/drivers/pps/clients/pps-gpio.c
index 333ad7d5b45b..aa8b8fb0e9ab 100644
--- a/drivers/pps/clients/pps-gpio.c
+++ b/drivers/pps/clients/pps-gpio.c
@@ -31,7 +31,8 @@
#include <linux/slab.h>
#include <linux/pps_kernel.h>
#include <linux/pps-gpio.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h> /* GPIO descriptor ABI */
+#include <linux/gpio.h> /* GPIO integer ABI */
#include <linux/list.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
@@ -41,9 +42,11 @@ struct pps_gpio_device_data {
int irq; /* IRQ used as PPS source */
struct pps_device *pps; /* PPS source device */
struct pps_source_info info; /* PPS source information */
+ struct gpio_desc *gpio_pin; /* GPIO port descriptors */
bool assert_falling_edge;
bool capture_clear;
- unsigned int gpio_pin;
+ bool legacy_int_gpio; /* flag for which ABI to use */
+ unsigned int gpio_pin_int; /* GPIO integer ABI */
};

/*
@@ -61,18 +64,87 @@ static irqreturn_t pps_gpio_irq_handler(int irq, void *data)

info = data;

- rising_edge = gpio_get_value(info->gpio_pin);
+ if (info->legacy_int_gpio)
+ rising_edge = gpio_get_value(info->gpio_pin_int);
+ else
+ 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);
else if (info->capture_clear &&
((rising_edge && info->assert_falling_edge) ||
- (!rising_edge && !info->assert_falling_edge)))
+ (!rising_edge && !info->assert_falling_edge)))
pps_event(info->pps, &ts, PPS_CAPTURECLEAR, NULL);

return IRQ_HANDLED;
}

+static int pps_gpio_setup(struct platform_device *pdev)
+{
+ struct pps_gpio_device_data *data = platform_get_drvdata(pdev);
+ const struct pps_gpio_platform_data *pdata = pdev->dev.platform_data;
+ struct device_node *np = pdev->dev.of_node;
+ const char *gpio_label;
+ int ret;
+
+ if (pdata) {
+ data->gpio_pin_int = pdata->gpio_pin_int;
+ data->gpio_pin = pdata->gpio_pin;
+ gpio_label = pdata->gpio_label;
+
+ data->assert_falling_edge = pdata->assert_falling_edge;
+ data->capture_clear = pdata->capture_clear;
+ } else {
+ if (of_get_property(np, "gpios", NULL)) { /* integer GPIO */
+ data->legacy_int_gpio = true;
+
+ ret = of_get_named_gpio(np, "gpios", 0);
+ if (ret < 0) {
+ dev_err(&pdev->dev,
+ "failed to get GPIO from device tree\n");
+ return ret;
+ }
+ data->gpio_pin_int = ret;
+ gpio_label = PPS_GPIO_NAME;
+
+ } else { /* descriptor GPIO */
+ data->gpio_pin = devm_gpiod_get(&pdev->dev,
+ "pps",
+ GPIOD_IN);
+ if (IS_ERR(data->gpio_pin)) {
+ dev_err(&pdev->dev,
+ "failed to request PPS GPIO\n");
+ return PTR_ERR(data->gpio_pin);
+ }
+ }
+
+ 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;
+ }
+
+ /* GPIO setup */
+ if (data->legacy_int_gpio) {
+ ret = devm_gpio_request(&pdev->dev,
+ data->gpio_pin_int,
+ gpio_label);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to request GPIO %u\n",
+ data->gpio_pin_int);
+ return ret;
+ }
+
+ ret = gpio_direction_input(data->gpio_pin_int);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to set pin as input\n");
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
static unsigned long
get_irqf_trigger_flags(const struct pps_gpio_device_data *data)
{
@@ -90,53 +162,26 @@ get_irqf_trigger_flags(const struct pps_gpio_device_data *data)
static int pps_gpio_probe(struct platform_device *pdev)
{
struct pps_gpio_device_data *data;
- const char *gpio_label;
int ret;
int pps_default_params;
- const struct pps_gpio_platform_data *pdata = pdev->dev.platform_data;
- struct device_node *np = pdev->dev.of_node;

/* allocate space for device info */
data = devm_kzalloc(&pdev->dev, sizeof(struct pps_gpio_device_data),
GFP_KERNEL);
if (!data)
return -ENOMEM;
-
- if (pdata) {
- data->gpio_pin = pdata->gpio_pin;
- gpio_label = pdata->gpio_label;
-
- data->assert_falling_edge = pdata->assert_falling_edge;
- data->capture_clear = pdata->capture_clear;
- } else {
- ret = of_get_gpio(np, 0);
- if (ret < 0) {
- dev_err(&pdev->dev, "failed to get GPIO from device tree\n");
- return ret;
- }
- data->gpio_pin = ret;
- gpio_label = PPS_GPIO_NAME;
-
- if (of_get_property(np, "assert-falling-edge", NULL))
- data->assert_falling_edge = true;
- }
+ platform_set_drvdata(pdev, data);

/* GPIO setup */
- ret = devm_gpio_request(&pdev->dev, data->gpio_pin, gpio_label);
- if (ret) {
- dev_err(&pdev->dev, "failed to request GPIO %u\n",
- data->gpio_pin);
- return ret;
- }
-
- ret = gpio_direction_input(data->gpio_pin);
- if (ret) {
- dev_err(&pdev->dev, "failed to set pin direction\n");
+ ret = pps_gpio_setup(pdev);
+ if (ret)
return -EINVAL;
- }

/* IRQ setup */
- ret = gpio_to_irq(data->gpio_pin);
+ if (data->legacy_int_gpio)
+ ret = gpio_to_irq(data->gpio_pin_int);
+ else
+ ret = gpiod_to_irq(data->gpio_pin);
if (ret < 0) {
dev_err(&pdev->dev, "failed to map GPIO to IRQ: %d\n", ret);
return -EINVAL;
@@ -173,7 +218,6 @@ static int pps_gpio_probe(struct platform_device *pdev)
return -EINVAL;
}

- platform_set_drvdata(pdev, data);
dev_info(data->pps->dev, "Registered IRQ %d as PPS source\n",
data->irq);

@@ -209,4 +253,4 @@ 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("1.0.0");
+MODULE_VERSION("1.1.0");
diff --git a/include/linux/pps-gpio.h b/include/linux/pps-gpio.h
index 56f35dd3d01d..86e2081dc7d1 100644
--- a/include/linux/pps-gpio.h
+++ b/include/linux/pps-gpio.h
@@ -23,9 +23,10 @@
#define _PPS_GPIO_H

struct pps_gpio_platform_data {
+ struct gpio_desc *gpio_pin;
bool assert_falling_edge;
bool capture_clear;
- unsigned int gpio_pin;
+ unsigned int gpio_pin_int;
const char *gpio_label;
};

--
2.12.3
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