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-rw-r--r--drivers/pps/clients/Kconfig9
-rw-r--r--drivers/pps/clients/Makefile1
-rw-r--r--drivers/pps/clients/pps-gpio.c227
-rw-r--r--drivers/pps/clients/pps-ktimer.c12
-rw-r--r--drivers/pps/clients/pps_parport.c9
-rw-r--r--drivers/pps/kapi.c20
6 files changed, 250 insertions, 28 deletions
diff --git a/drivers/pps/clients/Kconfig b/drivers/pps/clients/Kconfig
index 8520a7f4dd6..445197d4a8c 100644
--- a/drivers/pps/clients/Kconfig
+++ b/drivers/pps/clients/Kconfig
@@ -29,4 +29,13 @@ config PPS_CLIENT_PARPORT
If you say yes here you get support for a PPS source connected
with the interrupt pin of your parallel port.
+config PPS_CLIENT_GPIO
+ tristate "PPS client using GPIO"
+ depends on PPS && GENERIC_HARDIRQS
+ help
+ If you say yes here you get support for a PPS source using
+ GPIO. To be useful you must also register a platform device
+ specifying the GPIO pin and other options, usually in your board
+ setup.
+
endif
diff --git a/drivers/pps/clients/Makefile b/drivers/pps/clients/Makefile
index 4feb7e9e71e..a461d15f4a2 100644
--- a/drivers/pps/clients/Makefile
+++ b/drivers/pps/clients/Makefile
@@ -5,5 +5,6 @@
obj-$(CONFIG_PPS_CLIENT_KTIMER) += pps-ktimer.o
obj-$(CONFIG_PPS_CLIENT_LDISC) += pps-ldisc.o
obj-$(CONFIG_PPS_CLIENT_PARPORT) += pps_parport.o
+obj-$(CONFIG_PPS_CLIENT_GPIO) += pps-gpio.o
ccflags-$(CONFIG_PPS_DEBUG) := -DDEBUG
diff --git a/drivers/pps/clients/pps-gpio.c b/drivers/pps/clients/pps-gpio.c
new file mode 100644
index 00000000000..65505554547
--- /dev/null
+++ b/drivers/pps/clients/pps-gpio.c
@@ -0,0 +1,227 @@
+/*
+ * pps-gpio.c -- PPS client driver using GPIO
+ *
+ *
+ * Copyright (C) 2010 Ricardo Martins <rasm@fe.up.pt>
+ * Copyright (C) 2011 James Nuss <jamesnuss@nanometrics.ca>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#define PPS_GPIO_NAME "pps-gpio"
+#define pr_fmt(fmt) PPS_GPIO_NAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/pps_kernel.h>
+#include <linux/pps-gpio.h>
+#include <linux/gpio.h>
+#include <linux/list.h>
+
+/* Info for each registered platform device */
+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 */
+ const struct pps_gpio_platform_data *pdata;
+};
+
+/*
+ * Report the PPS event
+ */
+
+static irqreturn_t pps_gpio_irq_handler(int irq, void *data)
+{
+ const struct pps_gpio_device_data *info;
+ struct pps_event_time ts;
+ int rising_edge;
+
+ /* Get the time stamp first */
+ pps_get_ts(&ts);
+
+ info = data;
+
+ rising_edge = gpio_get_value(info->pdata->gpio_pin);
+ if ((rising_edge && !info->pdata->assert_falling_edge) ||
+ (!rising_edge && info->pdata->assert_falling_edge))
+ pps_event(info->pps, &ts, PPS_CAPTUREASSERT, NULL);
+ else if (info->pdata->capture_clear &&
+ ((rising_edge && info->pdata->assert_falling_edge) ||
+ (!rising_edge && !info->pdata->assert_falling_edge)))
+ pps_event(info->pps, &ts, PPS_CAPTURECLEAR, NULL);
+
+ return IRQ_HANDLED;
+}
+
+static int pps_gpio_setup(struct platform_device *pdev)
+{
+ int ret;
+ const struct pps_gpio_platform_data *pdata = pdev->dev.platform_data;
+
+ ret = gpio_request(pdata->gpio_pin, pdata->gpio_label);
+ if (ret) {
+ pr_warning("failed to request GPIO %u\n", pdata->gpio_pin);
+ return -EINVAL;
+ }
+
+ ret = gpio_direction_input(pdata->gpio_pin);
+ if (ret) {
+ pr_warning("failed to set pin direction\n");
+ gpio_free(pdata->gpio_pin);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static unsigned long
+get_irqf_trigger_flags(const struct pps_gpio_platform_data *pdata)
+{
+ unsigned long flags = pdata->assert_falling_edge ?
+ IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING;
+
+ if (pdata->capture_clear) {
+ flags |= ((flags & IRQF_TRIGGER_RISING) ?
+ IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING);
+ }
+
+ return flags;
+}
+
+static int pps_gpio_probe(struct platform_device *pdev)
+{
+ struct pps_gpio_device_data *data;
+ int irq;
+ int ret;
+ int err;
+ int pps_default_params;
+ const struct pps_gpio_platform_data *pdata = pdev->dev.platform_data;
+
+
+ /* GPIO setup */
+ ret = pps_gpio_setup(pdev);
+ if (ret)
+ return -EINVAL;
+
+ /* IRQ setup */
+ irq = gpio_to_irq(pdata->gpio_pin);
+ if (irq < 0) {
+ pr_err("failed to map GPIO to IRQ: %d\n", irq);
+ err = -EINVAL;
+ goto return_error;
+ }
+
+ /* allocate space for device info */
+ data = kzalloc(sizeof(struct pps_gpio_device_data), GFP_KERNEL);
+ if (data == NULL) {
+ err = -ENOMEM;
+ goto return_error;
+ }
+
+ /* initialize PPS specific parts of the bookkeeping data structure. */
+ data->info.mode = PPS_CAPTUREASSERT | PPS_OFFSETASSERT |
+ PPS_ECHOASSERT | PPS_CANWAIT | PPS_TSFMT_TSPEC;
+ if (pdata->capture_clear)
+ data->info.mode |= PPS_CAPTURECLEAR | PPS_OFFSETCLEAR |
+ PPS_ECHOCLEAR;
+ data->info.owner = THIS_MODULE;
+ snprintf(data->info.name, PPS_MAX_NAME_LEN - 1, "%s.%d",
+ pdev->name, pdev->id);
+
+ /* register PPS source */
+ pps_default_params = PPS_CAPTUREASSERT | PPS_OFFSETASSERT;
+ if (pdata->capture_clear)
+ pps_default_params |= PPS_CAPTURECLEAR | PPS_OFFSETCLEAR;
+ data->pps = pps_register_source(&data->info, pps_default_params);
+ if (data->pps == NULL) {
+ kfree(data);
+ pr_err("failed to register IRQ %d as PPS source\n", irq);
+ err = -EINVAL;
+ goto return_error;
+ }
+
+ data->irq = irq;
+ data->pdata = pdata;
+
+ /* register IRQ interrupt handler */
+ ret = request_irq(irq, pps_gpio_irq_handler,
+ get_irqf_trigger_flags(pdata), data->info.name, data);
+ if (ret) {
+ pps_unregister_source(data->pps);
+ kfree(data);
+ pr_err("failed to acquire IRQ %d\n", irq);
+ err = -EINVAL;
+ goto return_error;
+ }
+
+ platform_set_drvdata(pdev, data);
+ dev_info(data->pps->dev, "Registered IRQ %d as PPS source\n", irq);
+
+ return 0;
+
+return_error:
+ gpio_free(pdata->gpio_pin);
+ return err;
+}
+
+static int pps_gpio_remove(struct platform_device *pdev)
+{
+ struct pps_gpio_device_data *data = platform_get_drvdata(pdev);
+ const struct pps_gpio_platform_data *pdata = data->pdata;
+
+ platform_set_drvdata(pdev, NULL);
+ free_irq(data->irq, data);
+ gpio_free(pdata->gpio_pin);
+ pps_unregister_source(data->pps);
+ pr_info("removed IRQ %d as PPS source\n", data->irq);
+ kfree(data);
+ return 0;
+}
+
+static struct platform_driver pps_gpio_driver = {
+ .probe = pps_gpio_probe,
+ .remove = __devexit_p(pps_gpio_remove),
+ .driver = {
+ .name = PPS_GPIO_NAME,
+ .owner = THIS_MODULE
+ },
+};
+
+static int __init pps_gpio_init(void)
+{
+ int ret = platform_driver_register(&pps_gpio_driver);
+ if (ret < 0)
+ pr_err("failed to register platform driver\n");
+ return ret;
+}
+
+static void __exit pps_gpio_exit(void)
+{
+ platform_driver_unregister(&pps_gpio_driver);
+ pr_debug("unregistered platform driver\n");
+}
+
+module_init(pps_gpio_init);
+module_exit(pps_gpio_exit);
+
+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");
diff --git a/drivers/pps/clients/pps-ktimer.c b/drivers/pps/clients/pps-ktimer.c
index 82583b0ff82..436b4e4e71a 100644
--- a/drivers/pps/clients/pps-ktimer.c
+++ b/drivers/pps/clients/pps-ktimer.c
@@ -52,17 +52,6 @@ static void pps_ktimer_event(unsigned long ptr)
}
/*
- * The echo function
- */
-
-static void pps_ktimer_echo(struct pps_device *pps, int event, void *data)
-{
- dev_info(pps->dev, "echo %s %s\n",
- event & PPS_CAPTUREASSERT ? "assert" : "",
- event & PPS_CAPTURECLEAR ? "clear" : "");
-}
-
-/*
* The PPS info struct
*/
@@ -72,7 +61,6 @@ static struct pps_source_info pps_ktimer_info = {
.mode = PPS_CAPTUREASSERT | PPS_OFFSETASSERT |
PPS_ECHOASSERT |
PPS_CANWAIT | PPS_TSFMT_TSPEC,
- .echo = pps_ktimer_echo,
.owner = THIS_MODULE,
};
diff --git a/drivers/pps/clients/pps_parport.c b/drivers/pps/clients/pps_parport.c
index c571d6dd8f6..e1b4705ae3e 100644
--- a/drivers/pps/clients/pps_parport.c
+++ b/drivers/pps/clients/pps_parport.c
@@ -133,14 +133,6 @@ out_both:
return;
}
-/* the PPS echo function */
-static void pps_echo(struct pps_device *pps, int event, void *data)
-{
- dev_info(pps->dev, "echo %s %s\n",
- event & PPS_CAPTUREASSERT ? "assert" : "",
- event & PPS_CAPTURECLEAR ? "clear" : "");
-}
-
static void parport_attach(struct parport *port)
{
struct pps_client_pp *device;
@@ -151,7 +143,6 @@ static void parport_attach(struct parport *port)
PPS_OFFSETASSERT | PPS_OFFSETCLEAR | \
PPS_ECHOASSERT | PPS_ECHOCLEAR | \
PPS_CANWAIT | PPS_TSFMT_TSPEC,
- .echo = pps_echo,
.owner = THIS_MODULE,
.dev = NULL
};
diff --git a/drivers/pps/kapi.c b/drivers/pps/kapi.c
index a4e8eb9fece..f197e8ea185 100644
--- a/drivers/pps/kapi.c
+++ b/drivers/pps/kapi.c
@@ -52,6 +52,14 @@ static void pps_add_offset(struct pps_ktime *ts, struct pps_ktime *offset)
ts->sec += offset->sec;
}
+static void pps_echo_client_default(struct pps_device *pps, int event,
+ void *data)
+{
+ dev_info(pps->dev, "echo %s %s\n",
+ event & PPS_CAPTUREASSERT ? "assert" : "",
+ event & PPS_CAPTURECLEAR ? "clear" : "");
+}
+
/*
* Exported functions
*/
@@ -80,13 +88,6 @@ struct pps_device *pps_register_source(struct pps_source_info *info,
err = -EINVAL;
goto pps_register_source_exit;
}
- if ((info->mode & (PPS_ECHOASSERT | PPS_ECHOCLEAR)) != 0 &&
- info->echo == NULL) {
- pr_err("%s: echo function is not defined\n",
- info->name);
- err = -EINVAL;
- goto pps_register_source_exit;
- }
if ((info->mode & (PPS_TSFMT_TSPEC | PPS_TSFMT_NTPFP)) == 0) {
pr_err("%s: unspecified time format\n",
info->name);
@@ -108,6 +109,11 @@ struct pps_device *pps_register_source(struct pps_source_info *info,
pps->params.mode = default_params;
pps->info = *info;
+ /* check for default echo function */
+ if ((pps->info.mode & (PPS_ECHOASSERT | PPS_ECHOCLEAR)) &&
+ pps->info.echo == NULL)
+ pps->info.echo = pps_echo_client_default;
+
init_waitqueue_head(&pps->queue);
spin_lock_init(&pps->lock);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-26 11:28:31 +0000