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authorTom Burkart <tom@aussec.com>2019-05-14 15:45:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-05-14 19:52:51 -0700
commit4461d65176b408d6d7adefa41a95472a18a90a53 (patch)
tree8da092bd4a2848f83f9183bdab34768ecb114e6e /drivers/pps
parentb287a25a7148a89d977c819c1f7d6584f875b682 (diff)
download96b-common-4461d65176b408d6d7adefa41a95472a18a90a53.tar.gz
pps: descriptor-based gpio
This patch changes the GPIO access for the pps-gpio driver from the integer based API to the descriptor based API. The integer based API is considered deprecated and the descriptor based API is the preferred way to access GPIOs as per Documentation/driver-api/gpio/intro.rst No changes are made to userspace interfaces. Link: http://lkml.kernel.org/r/20190324043305.6627-2-tom@aussec.com Signed-off-by: Tom Burkart <tom@aussec.com> Acked-by: Rodolfo Giometti <giometti@enneenne.com> Reviewed-by: Philipp Zabel <philipp.zabel@gmail.com> Cc: Lukas Senger <lukas@fridolin.com> Cc: Rob Herring <robh@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/pps')
-rw-r--r--drivers/pps/clients/pps-gpio.c67
1 files changed, 31 insertions, 36 deletions
diff --git a/drivers/pps/clients/pps-gpio.c b/drivers/pps/clients/pps-gpio.c
index dd5d1103e02b..4e5e9229814b 100644
--- a/drivers/pps/clients/pps-gpio.c
+++ b/drivers/pps/clients/pps-gpio.c
@@ -31,7 +31,7 @@
#include <linux/slab.h>
#include <linux/pps_kernel.h>
#include <linux/pps-gpio.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
#include <linux/list.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
@@ -41,9 +41,9 @@ 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;
};
/*
@@ -61,18 +61,37 @@ static irqreturn_t pps_gpio_irq_handler(int irq, void *data)
info = data;
- rising_edge = gpio_get_value(info->gpio_pin);
+ 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);
+ struct device_node *np = pdev->dev.of_node;
+
+ data->gpio_pin = devm_gpiod_get(&pdev->dev,
+ NULL, /* request "gpios" */
+ 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_property_read_bool(np, "assert-falling-edge"))
+ data->assert_falling_edge = true;
+ return 0;
+}
+
static unsigned long
get_irqf_trigger_flags(const struct pps_gpio_device_data *data)
{
@@ -90,53 +109,30 @@ 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);
+ data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
+ platform_set_drvdata(pdev, data);
+ /* GPIO setup */
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;
- }
-
- /* 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");
- return -EINVAL;
+ ret = pps_gpio_setup(pdev);
+ if (ret)
+ return -EINVAL;
}
/* IRQ setup */
- ret = gpio_to_irq(data->gpio_pin);
+ 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 +169,6 @@ 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 +204,4 @@ 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");