v4.19.13 snapshot.
diff --git a/drivers/pps/clients/Kconfig b/drivers/pps/clients/Kconfig
new file mode 100644
index 0000000..7f02a9b
--- /dev/null
+++ b/drivers/pps/clients/Kconfig
@@ -0,0 +1,36 @@
+#
+# PPS clients configuration
+#
+
+comment "PPS clients support"
+
+config PPS_CLIENT_KTIMER
+ tristate "Kernel timer client (Testing client, use for debug)"
+ help
+ If you say yes here you get support for a PPS debugging client
+ which uses a kernel timer to generate the PPS signal.
+
+ This driver can also be built as a module. If so, the module
+ will be called pps-ktimer.
+
+config PPS_CLIENT_LDISC
+ tristate "PPS line discipline"
+ depends on TTY
+ help
+ If you say yes here you get support for a PPS source connected
+ with the CD (Carrier Detect) pin of your serial port.
+
+config PPS_CLIENT_PARPORT
+ tristate "Parallel port PPS client"
+ depends on PARPORT
+ help
+ 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"
+ 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.
diff --git a/drivers/pps/clients/Makefile b/drivers/pps/clients/Makefile
new file mode 100644
index 0000000..a461d15
--- /dev/null
+++ b/drivers/pps/clients/Makefile
@@ -0,0 +1,10 @@
+#
+# Makefile for PPS clients.
+#
+
+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 0000000..333ad7d
--- /dev/null
+++ b/drivers/pps/clients/pps-gpio.c
@@ -0,0 +1,212 @@
+/*
+ * 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>
+#include <linux/of_device.h>
+#include <linux/of_gpio.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 */
+ bool assert_falling_edge;
+ bool capture_clear;
+ unsigned int gpio_pin;
+};
+
+/*
+ * 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->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)))
+ pps_event(info->pps, &ts, PPS_CAPTURECLEAR, NULL);
+
+ return IRQ_HANDLED;
+}
+
+static unsigned long
+get_irqf_trigger_flags(const struct pps_gpio_device_data *data)
+{
+ unsigned long flags = data->assert_falling_edge ?
+ IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING;
+
+ if (data->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;
+ 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;
+ }
+
+ /* 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;
+ }
+
+ /* IRQ setup */
+ ret = gpio_to_irq(data->gpio_pin);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "failed to map GPIO to IRQ: %d\n", ret);
+ return -EINVAL;
+ }
+ data->irq = ret;
+
+ /* initialize PPS specific parts of the bookkeeping data structure. */
+ data->info.mode = PPS_CAPTUREASSERT | PPS_OFFSETASSERT |
+ PPS_ECHOASSERT | PPS_CANWAIT | PPS_TSFMT_TSPEC;
+ if (data->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 (data->capture_clear)
+ pps_default_params |= PPS_CAPTURECLEAR | PPS_OFFSETCLEAR;
+ data->pps = pps_register_source(&data->info, pps_default_params);
+ if (data->pps == NULL) {
+ dev_err(&pdev->dev, "failed to register IRQ %d as PPS source\n",
+ data->irq);
+ return -EINVAL;
+ }
+
+ /* register IRQ interrupt handler */
+ ret = devm_request_irq(&pdev->dev, data->irq, pps_gpio_irq_handler,
+ get_irqf_trigger_flags(data), data->info.name, data);
+ if (ret) {
+ pps_unregister_source(data->pps);
+ dev_err(&pdev->dev, "failed to acquire IRQ %d\n", data->irq);
+ return -EINVAL;
+ }
+
+ platform_set_drvdata(pdev, data);
+ dev_info(data->pps->dev, "Registered IRQ %d as PPS source\n",
+ data->irq);
+
+ return 0;
+}
+
+static int pps_gpio_remove(struct platform_device *pdev)
+{
+ struct pps_gpio_device_data *data = platform_get_drvdata(pdev);
+
+ pps_unregister_source(data->pps);
+ dev_info(&pdev->dev, "removed IRQ %d as PPS source\n", data->irq);
+ return 0;
+}
+
+static const struct of_device_id pps_gpio_dt_ids[] = {
+ { .compatible = "pps-gpio", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, pps_gpio_dt_ids);
+
+static struct platform_driver pps_gpio_driver = {
+ .probe = pps_gpio_probe,
+ .remove = pps_gpio_remove,
+ .driver = {
+ .name = PPS_GPIO_NAME,
+ .of_match_table = pps_gpio_dt_ids,
+ },
+};
+
+module_platform_driver(pps_gpio_driver);
+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
new file mode 100644
index 0000000..0473564
--- /dev/null
+++ b/drivers/pps/clients/pps-ktimer.c
@@ -0,0 +1,101 @@
+/*
+ * pps-ktimer.c -- kernel timer test client
+ *
+ *
+ * Copyright (C) 2005-2006 Rodolfo Giometti <giometti@linux.it>
+ *
+ * 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 pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/time.h>
+#include <linux/timer.h>
+#include <linux/pps_kernel.h>
+
+/*
+ * Global variables
+ */
+
+static struct pps_device *pps;
+static struct timer_list ktimer;
+
+/*
+ * The kernel timer
+ */
+
+static void pps_ktimer_event(struct timer_list *unused)
+{
+ struct pps_event_time ts;
+
+ /* First of all we get the time stamp... */
+ pps_get_ts(&ts);
+
+ pps_event(pps, &ts, PPS_CAPTUREASSERT, NULL);
+
+ mod_timer(&ktimer, jiffies + HZ);
+}
+
+/*
+ * The PPS info struct
+ */
+
+static struct pps_source_info pps_ktimer_info = {
+ .name = "ktimer",
+ .path = "",
+ .mode = PPS_CAPTUREASSERT | PPS_OFFSETASSERT |
+ PPS_ECHOASSERT |
+ PPS_CANWAIT | PPS_TSFMT_TSPEC,
+ .owner = THIS_MODULE,
+};
+
+/*
+ * Module staff
+ */
+
+static void __exit pps_ktimer_exit(void)
+{
+ dev_info(pps->dev, "ktimer PPS source unregistered\n");
+
+ del_timer_sync(&ktimer);
+ pps_unregister_source(pps);
+}
+
+static int __init pps_ktimer_init(void)
+{
+ pps = pps_register_source(&pps_ktimer_info,
+ PPS_CAPTUREASSERT | PPS_OFFSETASSERT);
+ if (pps == NULL) {
+ pr_err("cannot register PPS source\n");
+ return -ENOMEM;
+ }
+
+ timer_setup(&ktimer, pps_ktimer_event, 0);
+ mod_timer(&ktimer, jiffies + HZ);
+
+ dev_info(pps->dev, "ktimer PPS source registered\n");
+
+ return 0;
+}
+
+module_init(pps_ktimer_init);
+module_exit(pps_ktimer_exit);
+
+MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
+MODULE_DESCRIPTION("dummy PPS source by using a kernel timer (just for debug)");
+MODULE_LICENSE("GPL");
diff --git a/drivers/pps/clients/pps-ldisc.c b/drivers/pps/clients/pps-ldisc.c
new file mode 100644
index 0000000..73bd3bb
--- /dev/null
+++ b/drivers/pps/clients/pps-ldisc.c
@@ -0,0 +1,163 @@
+/*
+ * pps-ldisc.c -- PPS line discipline
+ *
+ *
+ * Copyright (C) 2008 Rodolfo Giometti <giometti@linux.it>
+ *
+ * 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 pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/serial_core.h>
+#include <linux/tty.h>
+#include <linux/pps_kernel.h>
+#include <linux/bug.h>
+
+#define PPS_TTY_MAGIC 0x0001
+
+static void pps_tty_dcd_change(struct tty_struct *tty, unsigned int status)
+{
+ struct pps_device *pps;
+ struct pps_event_time ts;
+
+ pps_get_ts(&ts);
+
+ pps = pps_lookup_dev(tty);
+ /*
+ * This should never fail, but the ldisc locking is very
+ * convoluted, so don't crash just in case.
+ */
+ if (WARN_ON_ONCE(pps == NULL))
+ return;
+
+ /* Now do the PPS event report */
+ pps_event(pps, &ts, status ? PPS_CAPTUREASSERT :
+ PPS_CAPTURECLEAR, NULL);
+
+ dev_dbg(pps->dev, "PPS %s at %lu\n",
+ status ? "assert" : "clear", jiffies);
+}
+
+static int (*alias_n_tty_open)(struct tty_struct *tty);
+
+static int pps_tty_open(struct tty_struct *tty)
+{
+ struct pps_source_info info;
+ struct tty_driver *drv = tty->driver;
+ int index = tty->index + drv->name_base;
+ struct pps_device *pps;
+ int ret;
+
+ info.owner = THIS_MODULE;
+ info.dev = NULL;
+ snprintf(info.name, PPS_MAX_NAME_LEN, "%s%d", drv->driver_name, index);
+ snprintf(info.path, PPS_MAX_NAME_LEN, "/dev/%s%d", drv->name, index);
+ info.mode = PPS_CAPTUREBOTH | \
+ PPS_OFFSETASSERT | PPS_OFFSETCLEAR | \
+ PPS_CANWAIT | PPS_TSFMT_TSPEC;
+
+ pps = pps_register_source(&info, PPS_CAPTUREBOTH | \
+ PPS_OFFSETASSERT | PPS_OFFSETCLEAR);
+ if (pps == NULL) {
+ pr_err("cannot register PPS source \"%s\"\n", info.path);
+ return -ENOMEM;
+ }
+ pps->lookup_cookie = tty;
+
+ /* Now open the base class N_TTY ldisc */
+ ret = alias_n_tty_open(tty);
+ if (ret < 0) {
+ pr_err("cannot open tty ldisc \"%s\"\n", info.path);
+ goto err_unregister;
+ }
+
+ dev_info(pps->dev, "source \"%s\" added\n", info.path);
+
+ return 0;
+
+err_unregister:
+ pps_unregister_source(pps);
+ return ret;
+}
+
+static void (*alias_n_tty_close)(struct tty_struct *tty);
+
+static void pps_tty_close(struct tty_struct *tty)
+{
+ struct pps_device *pps = pps_lookup_dev(tty);
+
+ alias_n_tty_close(tty);
+
+ if (WARN_ON(!pps))
+ return;
+
+ dev_info(pps->dev, "removed\n");
+ pps_unregister_source(pps);
+}
+
+static struct tty_ldisc_ops pps_ldisc_ops;
+
+/*
+ * Module stuff
+ */
+
+static int __init pps_tty_init(void)
+{
+ int err;
+
+ /* Inherit the N_TTY's ops */
+ n_tty_inherit_ops(&pps_ldisc_ops);
+
+ /* Save N_TTY's open()/close() methods */
+ alias_n_tty_open = pps_ldisc_ops.open;
+ alias_n_tty_close = pps_ldisc_ops.close;
+
+ /* Init PPS_TTY data */
+ pps_ldisc_ops.owner = THIS_MODULE;
+ pps_ldisc_ops.magic = PPS_TTY_MAGIC;
+ pps_ldisc_ops.name = "pps_tty";
+ pps_ldisc_ops.dcd_change = pps_tty_dcd_change;
+ pps_ldisc_ops.open = pps_tty_open;
+ pps_ldisc_ops.close = pps_tty_close;
+
+ err = tty_register_ldisc(N_PPS, &pps_ldisc_ops);
+ if (err)
+ pr_err("can't register PPS line discipline\n");
+ else
+ pr_info("PPS line discipline registered\n");
+
+ return err;
+}
+
+static void __exit pps_tty_cleanup(void)
+{
+ int err;
+
+ err = tty_unregister_ldisc(N_PPS);
+ if (err)
+ pr_err("can't unregister PPS line discipline\n");
+ else
+ pr_info("PPS line discipline removed\n");
+}
+
+module_init(pps_tty_init);
+module_exit(pps_tty_cleanup);
+
+MODULE_ALIAS_LDISC(N_PPS);
+MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
+MODULE_DESCRIPTION("PPS TTY device driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/pps/clients/pps_parport.c b/drivers/pps/clients/pps_parport.c
new file mode 100644
index 0000000..4db824f
--- /dev/null
+++ b/drivers/pps/clients/pps_parport.c
@@ -0,0 +1,265 @@
+/*
+ * pps_parport.c -- kernel parallel port PPS client
+ *
+ *
+ * Copyright (C) 2009 Alexander Gordeev <lasaine@lvk.cs.msu.su>
+ *
+ * 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.
+ */
+
+
+/*
+ * TODO:
+ * implement echo over SEL pin
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/irqnr.h>
+#include <linux/time.h>
+#include <linux/slab.h>
+#include <linux/parport.h>
+#include <linux/pps_kernel.h>
+
+#define DRVDESC "parallel port PPS client"
+
+/* module parameters */
+
+#define CLEAR_WAIT_MAX 100
+#define CLEAR_WAIT_MAX_ERRORS 5
+
+static unsigned int clear_wait = 100;
+MODULE_PARM_DESC(clear_wait,
+ "Maximum number of port reads when polling for signal clear,"
+ " zero turns clear edge capture off entirely");
+module_param(clear_wait, uint, 0);
+
+static DEFINE_IDA(pps_client_index);
+
+/* internal per port structure */
+struct pps_client_pp {
+ struct pardevice *pardev; /* parport device */
+ struct pps_device *pps; /* PPS device */
+ unsigned int cw; /* port clear timeout */
+ unsigned int cw_err; /* number of timeouts */
+ int index; /* device number */
+};
+
+static inline int signal_is_set(struct parport *port)
+{
+ return (port->ops->read_status(port) & PARPORT_STATUS_ACK) != 0;
+}
+
+/* parport interrupt handler */
+static void parport_irq(void *handle)
+{
+ struct pps_event_time ts_assert, ts_clear;
+ struct pps_client_pp *dev = handle;
+ struct parport *port = dev->pardev->port;
+ unsigned int i;
+ unsigned long flags;
+
+ /* first of all we get the time stamp... */
+ pps_get_ts(&ts_assert);
+
+ if (dev->cw == 0)
+ /* clear edge capture disabled */
+ goto out_assert;
+
+ /* try capture the clear edge */
+
+ /* We have to disable interrupts here. The idea is to prevent
+ * other interrupts on the same processor to introduce random
+ * lags while polling the port. Reading from IO port is known
+ * to take approximately 1us while other interrupt handlers can
+ * take much more potentially.
+ *
+ * Interrupts won't be disabled for a long time because the
+ * number of polls is limited by clear_wait parameter which is
+ * kept rather low. So it should never be an issue.
+ */
+ local_irq_save(flags);
+ /* check the signal (no signal means the pulse is lost this time) */
+ if (!signal_is_set(port)) {
+ local_irq_restore(flags);
+ dev_err(dev->pps->dev, "lost the signal\n");
+ goto out_assert;
+ }
+
+ /* poll the port until the signal is unset */
+ for (i = dev->cw; i; i--)
+ if (!signal_is_set(port)) {
+ pps_get_ts(&ts_clear);
+ local_irq_restore(flags);
+ dev->cw_err = 0;
+ goto out_both;
+ }
+ local_irq_restore(flags);
+
+ /* timeout */
+ dev->cw_err++;
+ if (dev->cw_err >= CLEAR_WAIT_MAX_ERRORS) {
+ dev_err(dev->pps->dev, "disabled clear edge capture after %d"
+ " timeouts\n", dev->cw_err);
+ dev->cw = 0;
+ dev->cw_err = 0;
+ }
+
+out_assert:
+ /* fire assert event */
+ pps_event(dev->pps, &ts_assert,
+ PPS_CAPTUREASSERT, NULL);
+ return;
+
+out_both:
+ /* fire assert event */
+ pps_event(dev->pps, &ts_assert,
+ PPS_CAPTUREASSERT, NULL);
+ /* fire clear event */
+ pps_event(dev->pps, &ts_clear,
+ PPS_CAPTURECLEAR, NULL);
+ return;
+}
+
+static void parport_attach(struct parport *port)
+{
+ struct pardev_cb pps_client_cb;
+ int index;
+ struct pps_client_pp *device;
+ struct pps_source_info info = {
+ .name = KBUILD_MODNAME,
+ .path = "",
+ .mode = PPS_CAPTUREBOTH | \
+ PPS_OFFSETASSERT | PPS_OFFSETCLEAR | \
+ PPS_ECHOASSERT | PPS_ECHOCLEAR | \
+ PPS_CANWAIT | PPS_TSFMT_TSPEC,
+ .owner = THIS_MODULE,
+ .dev = NULL
+ };
+
+ device = kzalloc(sizeof(struct pps_client_pp), GFP_KERNEL);
+ if (!device) {
+ pr_err("memory allocation failed, not attaching\n");
+ return;
+ }
+
+ index = ida_simple_get(&pps_client_index, 0, 0, GFP_KERNEL);
+ memset(&pps_client_cb, 0, sizeof(pps_client_cb));
+ pps_client_cb.private = device;
+ pps_client_cb.irq_func = parport_irq;
+ pps_client_cb.flags = PARPORT_FLAG_EXCL;
+ device->pardev = parport_register_dev_model(port,
+ KBUILD_MODNAME,
+ &pps_client_cb,
+ index);
+ if (!device->pardev) {
+ pr_err("couldn't register with %s\n", port->name);
+ goto err_free;
+ }
+
+ if (parport_claim_or_block(device->pardev) < 0) {
+ pr_err("couldn't claim %s\n", port->name);
+ goto err_unregister_dev;
+ }
+
+ device->pps = pps_register_source(&info,
+ PPS_CAPTUREBOTH | PPS_OFFSETASSERT | PPS_OFFSETCLEAR);
+ if (device->pps == NULL) {
+ pr_err("couldn't register PPS source\n");
+ goto err_release_dev;
+ }
+
+ device->cw = clear_wait;
+
+ port->ops->enable_irq(port);
+ device->index = index;
+
+ pr_info("attached to %s\n", port->name);
+
+ return;
+
+err_release_dev:
+ parport_release(device->pardev);
+err_unregister_dev:
+ parport_unregister_device(device->pardev);
+err_free:
+ ida_simple_remove(&pps_client_index, index);
+ kfree(device);
+}
+
+static void parport_detach(struct parport *port)
+{
+ struct pardevice *pardev = port->cad;
+ struct pps_client_pp *device;
+
+ /* FIXME: oooh, this is ugly! */
+ if (!pardev || strcmp(pardev->name, KBUILD_MODNAME))
+ /* not our port */
+ return;
+
+ device = pardev->private;
+
+ port->ops->disable_irq(port);
+ pps_unregister_source(device->pps);
+ parport_release(pardev);
+ parport_unregister_device(pardev);
+ ida_simple_remove(&pps_client_index, device->index);
+ kfree(device);
+}
+
+static struct parport_driver pps_parport_driver = {
+ .name = KBUILD_MODNAME,
+ .match_port = parport_attach,
+ .detach = parport_detach,
+ .devmodel = true,
+};
+
+/* module staff */
+
+static int __init pps_parport_init(void)
+{
+ int ret;
+
+ pr_info(DRVDESC "\n");
+
+ if (clear_wait > CLEAR_WAIT_MAX) {
+ pr_err("clear_wait value should be not greater"
+ " then %d\n", CLEAR_WAIT_MAX);
+ return -EINVAL;
+ }
+
+ ret = parport_register_driver(&pps_parport_driver);
+ if (ret) {
+ pr_err("unable to register with parport\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static void __exit pps_parport_exit(void)
+{
+ parport_unregister_driver(&pps_parport_driver);
+}
+
+module_init(pps_parport_init);
+module_exit(pps_parport_exit);
+
+MODULE_AUTHOR("Alexander Gordeev <lasaine@lvk.cs.msu.su>");
+MODULE_DESCRIPTION(DRVDESC);
+MODULE_LICENSE("GPL");