kernel: Remove gpio-pwm patches

There is no platform using the gpio-pwm driver, yet these patches break the
generic PWM framework that is in upstream. So just remove them.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37490 3c298f89-4303-0410-b956-a3cf2f4a3e73

4 files changed, 0 insertions, 966 deletions

diff --git a/target/linux/generic/files/drivers/pwm/Kconfig b/target/linux/generic/files/drivers/pwm/Kconfig
deleted file mode 100644
index 70f4442eab..0000000000
--- a/target/linux/generic/files/drivers/pwm/Kconfig
+++ /dev/null
@@ -1,20 +0,0 @@
-#
-# PWM infrastructure and devices
-#
-
-menuconfig GENERIC_PWM
-	tristate "PWM Support"
-	depends on SYSFS
-	help
-	  This enables PWM support through the generic PWM library.
-	  If unsure, say N.
-
-if GENERIC_PWM
-
-config GPIO_PWM
-       tristate "PWM emulation using GPIO"
-       help
-         This option enables a single-channel PWM device using
-	 a kernel interval timer and a GPIO pin.  If unsure, say N.
-
-endif
diff --git a/target/linux/generic/files/drivers/pwm/Makefile b/target/linux/generic/files/drivers/pwm/Makefile
deleted file mode 100644
index 3a0e996744..0000000000
--- a/target/linux/generic/files/drivers/pwm/Makefile
+++ /dev/null
@@ -1,5 +0,0 @@
-#
-# Makefile for pwm devices
-#
-obj-$(CONFIG_GENERIC_PWM) := pwm.o
-obj-$(CONFIG_GPIO_PWM)		+= gpio-pwm.o
diff --git a/target/linux/generic/files/drivers/pwm/gpio-pwm.c b/target/linux/generic/files/drivers/pwm/gpio-pwm.c
deleted file mode 100644
index 58e518fe7d..0000000000
--- a/target/linux/generic/files/drivers/pwm/gpio-pwm.c
+++ /dev/null
@@ -1,298 +0,0 @@
-/*
- * drivers/pwm/gpio.c
- *
- * Models a single-channel PWM device using a timer and a GPIO pin.
- *
- * Copyright (C) 2010 Bill Gatliff <bgat@billgatliff.com>
- *
- * This program is free software; you may redistribute and/or modify
- * it under the terms of the GNU General Public License Version 2, as
- * published by the Free Software Foundation.
- *
- * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- * USA
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/hrtimer.h>
-#include <linux/err.h>
-#include <linux/platform_device.h>
-#include <linux/workqueue.h>
-#include <linux/gpio.h>
-#include <linux/slab.h>
-#include <linux/pwm/pwm.h>
-
-struct gpio_pwm {
-	struct pwm_device pwm;
-	struct hrtimer timer;
-	struct work_struct work;
-	pwm_callback_t callback;
-	int gpio;
-	unsigned long polarity : 1;
-	unsigned long active : 1;
-};
-
-static inline struct gpio_pwm *to_gpio_pwm(const struct pwm_channel *p)
-{
-	return container_of(p->pwm, struct gpio_pwm, pwm);
-}
-
-static void
-gpio_pwm_work (struct work_struct *work)
-{
-	struct gpio_pwm *gp = container_of(work, struct gpio_pwm, work);
-
-	if (gp->active)
-		gpio_direction_output(gp->gpio, gp->polarity ? 1 : 0);
-	else
-		gpio_direction_output(gp->gpio, gp->polarity ? 0 : 1);
-}
-
-static enum hrtimer_restart
-gpio_pwm_timeout(struct hrtimer *t)
-{
-	struct gpio_pwm *gp = container_of(t, struct gpio_pwm, timer);
-	ktime_t tnew;
-
-	if (unlikely(gp->pwm.channels[0].duty_ticks == 0))
-		gp->active = 0;
-	else if (unlikely(gp->pwm.channels[0].duty_ticks
-			  == gp->pwm.channels[0].period_ticks))
-		gp->active = 1;
-	else
-		gp->active ^= 1;
-
-	if (gpio_cansleep(gp->gpio))
-		schedule_work(&gp->work);
-	else
-		gpio_pwm_work(&gp->work);
-
-	if (!gp->active && gp->pwm.channels[0].callback)
-		gp->pwm.channels[0].callback(&gp->pwm.channels[0]);
-
-	if (unlikely(!gp->active &&
-		     (gp->pwm.channels[0].flags & BIT(FLAG_STOP)))) {
-		clear_bit(FLAG_STOP, &gp->pwm.channels[0].flags);
-		complete_all(&gp->pwm.channels[0].complete);
-		return HRTIMER_NORESTART;
-	}
-
-	if (gp->active)
-		tnew = ktime_set(0, gp->pwm.channels[0].duty_ticks);
-	else
-		tnew = ktime_set(0, gp->pwm.channels[0].period_ticks
-				 - gp->pwm.channels[0].duty_ticks);
-	hrtimer_start(&gp->timer, tnew, HRTIMER_MODE_REL);
-
-	return HRTIMER_NORESTART;
-}
-
-static void gpio_pwm_start(struct pwm_channel *p)
-{
-	struct gpio_pwm *gp = to_gpio_pwm(p);
-
-	gp->active = 0;
-	gpio_pwm_timeout(&gp->timer);
-}
-
-static int
-gpio_pwm_config_nosleep(struct pwm_channel *p,
-			struct pwm_channel_config *c)
-{
-	struct gpio_pwm *gp = to_gpio_pwm(p);
-	int ret = 0;
-	unsigned long flags;
-
-	spin_lock_irqsave(&p->lock, flags);
-
-	switch (c->config_mask) {
-
-	case PWM_CONFIG_DUTY_TICKS:
-		p->duty_ticks = c->duty_ticks;
-		break;
-
-	case PWM_CONFIG_START:
-		if (!hrtimer_active(&gp->timer)) {
-			gpio_pwm_start(p);
-		}
-		break;
-	default:
-		ret = -EINVAL;
-		break;
-	}
-
-	spin_unlock_irqrestore(&p->lock, flags);
-	return ret;
-}
-
-static int
-gpio_pwm_stop_sync(struct pwm_channel *p)
-{
-	struct gpio_pwm *gp = to_gpio_pwm(p);
-	int ret;
-	int was_on = hrtimer_active(&gp->timer);
-
-	if (was_on) {
-		do {
-			init_completion(&p->complete);
-			set_bit(FLAG_STOP, &p->flags);
-			ret = wait_for_completion_interruptible(&p->complete);
-			if (ret)
-				return ret;
-		} while (p->flags & BIT(FLAG_STOP));
-	}
-
-	return was_on;
-}
-
-static int
-gpio_pwm_config(struct pwm_channel *p,
-		struct pwm_channel_config *c)
-{
-	struct gpio_pwm *gp = to_gpio_pwm(p);
-	int was_on = 0;
-
-	if (p->pwm->config_nosleep) {
-		if (!p->pwm->config_nosleep(p, c))
-			return 0;
-	}
-
-	might_sleep();
-
-	was_on = gpio_pwm_stop_sync(p);
-	if (was_on < 0)
-		return was_on;
-
-	if (c->config_mask & PWM_CONFIG_PERIOD_TICKS)
-		p->period_ticks = c->period_ticks;
-
-	if (c->config_mask & PWM_CONFIG_DUTY_TICKS)
-		p->duty_ticks = c->duty_ticks;
-
-	if (c->config_mask & PWM_CONFIG_POLARITY) {
-		gp->polarity = c->polarity ? 1 : 0;
-		p->active_high = gp->polarity;
-	}
-
-	if ((c->config_mask & PWM_CONFIG_START)
-	    || (was_on && !(c->config_mask & PWM_CONFIG_STOP)))
-		gpio_pwm_start(p);
-
-	return 0;
-}
-
-static int
-gpio_pwm_set_callback(struct pwm_channel *p,
-		      pwm_callback_t callback)
-{
-	struct gpio_pwm *gp = to_gpio_pwm(p);
-	gp->callback = callback;
-	return 0;
-}
-
-static int
-gpio_pwm_request(struct pwm_channel *p)
-{
-	p->tick_hz = 1000000000UL;
-	return 0;
-}
-
-static int
-gpio_pwm_probe(struct platform_device *pdev)
-{
-	struct gpio_pwm *gp;
-	struct gpio_pwm_platform_data *gpd = pdev->dev.platform_data;
-	int ret = 0;
-
-	/* TODO: create configfs entries, so users can assign GPIOs to
-	 * PWMs at runtime instead of creating a platform_device
-	 * specification and rebuilding their kernel */
-
-	if (!gpd || gpio_request(gpd->gpio, dev_name(&pdev->dev)))
-		return -EINVAL;
-
-	gp = kzalloc(sizeof(*gp), GFP_KERNEL);
-	if (!gp) {
-		ret = -ENOMEM;
-		goto err_alloc;
-	}
-
-	platform_set_drvdata(pdev, gp);
-
-	gp->pwm.dev = &pdev->dev;
-	gp->pwm.bus_id = dev_name(&pdev->dev);
-	gp->pwm.nchan = 1;
-	gp->gpio = gpd->gpio;
-
-	INIT_WORK(&gp->work, gpio_pwm_work);
-
-	hrtimer_init(&gp->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
-	gp->timer.function = gpio_pwm_timeout;
-
-	gp->pwm.owner = THIS_MODULE;
-	gp->pwm.config_nosleep = gpio_pwm_config_nosleep;
-	gp->pwm.config = gpio_pwm_config;
-	gp->pwm.request = gpio_pwm_request;
-	gp->pwm.set_callback = gpio_pwm_set_callback;
-
-	ret = pwm_register(&gp->pwm);
-	if (ret)
-		goto err_pwm_register;
-
-	return 0;
-
-err_pwm_register:
-	platform_set_drvdata(pdev, 0);
-	kfree(gp);
-err_alloc:
-	return ret;
-}
-
-static int
-gpio_pwm_remove(struct platform_device *pdev)
-{
-	struct gpio_pwm *gp = platform_get_drvdata(pdev);
-	int ret;
-
-	ret = pwm_unregister(&gp->pwm);
-	hrtimer_cancel(&gp->timer);
-	cancel_work_sync(&gp->work);
-	platform_set_drvdata(pdev, 0);
-	kfree(gp);
-
-	return 0;
-}
-
-static struct platform_driver gpio_pwm_driver = {
-	.driver = {
-		.name = "gpio_pwm",
-		.owner = THIS_MODULE,
-	},
-	.probe = gpio_pwm_probe,
-	.remove = gpio_pwm_remove,
-};
-
-static int __init gpio_pwm_init(void)
-{
-	return platform_driver_register(&gpio_pwm_driver);
-}
-module_init(gpio_pwm_init);
-
-static void __exit gpio_pwm_exit(void)
-{
-	platform_driver_unregister(&gpio_pwm_driver);
-}
-module_exit(gpio_pwm_exit);
-
-MODULE_AUTHOR("Bill Gatliff <bgat@billgatliff.com>");
-MODULE_DESCRIPTION("PWM output using GPIO and a high-resolution timer");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:gpio_pwm");
diff --git a/target/linux/generic/files/drivers/pwm/pwm.c b/target/linux/generic/files/drivers/pwm/pwm.c
deleted file mode 100644
index c1596e9e7e..0000000000
--- a/target/linux/generic/files/drivers/pwm/pwm.c
+++ /dev/null
@@ -1,643 +0,0 @@
-/*
- * drivers/pwm/pwm.c
- *
- * Copyright (C) 2010 Bill Gatliff <bgat@billgatliff.com>
- *
- * This program is free software; you may redistribute and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- * USA
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/device.h>
-#include <linux/spinlock.h>
-#include <linux/fs.h>
-#include <linux/completion.h>
-#include <linux/workqueue.h>
-#include <linux/list.h>
-#include <linux/sched.h>
-#include <linux/slab.h>    /*kcalloc, kfree since 2.6.34 */
-#include <linux/pwm/pwm.h>
-
-static int __pwm_create_sysfs(struct pwm_device *pwm);
-
-static const char *REQUEST_SYSFS = "sysfs";
-static LIST_HEAD(pwm_device_list);
-static DEFINE_MUTEX(device_list_mutex);
-static struct class pwm_class;
-static struct workqueue_struct *pwm_handler_workqueue;
-
-int pwm_register(struct pwm_device *pwm)
-{
-	struct pwm_channel *p;
-	int wchan;
-	int ret;
-
-	spin_lock_init(&pwm->list_lock);
-
-	p = kcalloc(pwm->nchan, sizeof(*p), GFP_KERNEL);
-	if (!p)
-		return -ENOMEM;
-
-	for (wchan = 0; wchan < pwm->nchan; wchan++) {
-		spin_lock_init(&p[wchan].lock);
-		init_completion(&p[wchan].complete);
-		p[wchan].chan = wchan;
-		p[wchan].pwm = pwm;
-	}
-
-	pwm->channels = p;
-
-	mutex_lock(&device_list_mutex);
-
-	list_add_tail(&pwm->list, &pwm_device_list);
-	ret = __pwm_create_sysfs(pwm);
-	if (ret) {
-		mutex_unlock(&device_list_mutex);
-		goto err_create_sysfs;
-	}
-
-	mutex_unlock(&device_list_mutex);
-
-	dev_info(pwm->dev, "%d channel%s\n", pwm->nchan,
-		 pwm->nchan > 1 ? "s" : "");
-	return 0;
-
-err_create_sysfs:
-	kfree(p);
-
-	return ret;
-}
-EXPORT_SYMBOL(pwm_register);
-
-static int __match_device(struct device *dev, void *data)
-{
-	return dev_get_drvdata(dev) == data;
-}
-
-int pwm_unregister(struct pwm_device *pwm)
-{
-	int wchan;
-	struct device *dev;
-
-	mutex_lock(&device_list_mutex);
-
-	for (wchan = 0; wchan < pwm->nchan; wchan++) {
-	  if (pwm->channels[wchan].flags & BIT(FLAG_REQUESTED)) {
-			mutex_unlock(&device_list_mutex);
-			return -EBUSY;
-		}
-	}
-
-	for (wchan = 0; wchan < pwm->nchan; wchan++) {
-		dev = class_find_device(&pwm_class, NULL,
-					&pwm->channels[wchan],
-					__match_device);
-		if (dev) {
-			put_device(dev);
-			device_unregister(dev);
-		}
-	}
-
-	kfree(pwm->channels);
-	list_del(&pwm->list);
-	mutex_unlock(&device_list_mutex);
-
-	return 0;
-}
-EXPORT_SYMBOL(pwm_unregister);
-
-static struct pwm_device *
-__pwm_find_device(const char *bus_id)
-{
-	struct pwm_device *p;
-
-	list_for_each_entry(p, &pwm_device_list, list) {
-		if (!strcmp(bus_id, p->bus_id))
-			return p;
-	}
-	return NULL;
-}
-
-static int
-__pwm_request_channel(struct pwm_channel *p,
-		      const char *requester)
-{
-	int ret;
-
-	if (test_and_set_bit(FLAG_REQUESTED, &p->flags))
-		return -EBUSY;
-
-	if (p->pwm->request) {
-		ret = p->pwm->request(p);
-		if (ret) {
-			clear_bit(FLAG_REQUESTED, &p->flags);
-			return ret;
-		}
-	}
-
-	p->requester = requester;
-	if (!strcmp(requester, REQUEST_SYSFS))
-		p->pid = current->pid;
-
-	return 0;
-}
-
-struct pwm_channel *
-pwm_request(const char *bus_id,
-	    int chan,
-	    const char *requester)
-{
-	struct pwm_device *p;
-	int ret;
-
-	mutex_lock(&device_list_mutex);
-
-	p = __pwm_find_device(bus_id);
-	if (!p || chan >= p->nchan)
-		goto err_no_device;
-
-	if (!try_module_get(p->owner))
-		goto err_module_get_failed;
-
-	ret = __pwm_request_channel(&p->channels[chan], requester);
-	if (ret)
-		goto err_request_failed;
-
-	mutex_unlock(&device_list_mutex);
-	return &p->channels[chan];
-
-err_request_failed:
-	module_put(p->owner);
-err_module_get_failed:
-err_no_device:
-	mutex_unlock(&device_list_mutex);
-	return NULL;
-}
-EXPORT_SYMBOL(pwm_request);
-
-void pwm_free(struct pwm_channel *p)
-{
-	mutex_lock(&device_list_mutex);
-
-	if (!test_and_clear_bit(FLAG_REQUESTED, &p->flags))
-		goto done;
-
-	pwm_stop(p);
-	pwm_unsynchronize(p, NULL);
-	pwm_set_handler(p, NULL, NULL);
-
-	if (p->pwm->free)
-		p->pwm->free(p);
-	module_put(p->pwm->owner);
-done:
-	mutex_unlock(&device_list_mutex);
-}
-EXPORT_SYMBOL(pwm_free);
-
-unsigned long pwm_ns_to_ticks(struct pwm_channel *p,
-			      unsigned long nsecs)
-{
-	unsigned long long ticks;
-
-	ticks = nsecs;
-	ticks *= p->tick_hz;
-	do_div(ticks, 1000000000);
-	return ticks;
-}
-EXPORT_SYMBOL(pwm_ns_to_ticks);
-
-unsigned long pwm_ticks_to_ns(struct pwm_channel *p,
-			      unsigned long ticks)
-{
-	unsigned long long ns;
-
-	if (!p->tick_hz)
-		return 0;
-
-	ns = ticks;
-	ns *= 1000000000UL;
-	do_div(ns, p->tick_hz);
-	return ns;
-}
-EXPORT_SYMBOL(pwm_ticks_to_ns);
-
-static void
-pwm_config_ns_to_ticks(struct pwm_channel *p,
-		       struct pwm_channel_config *c)
-{
-	if (c->config_mask & PWM_CONFIG_PERIOD_NS) {
-		c->period_ticks = pwm_ns_to_ticks(p, c->period_ns);
-		c->config_mask &= ~PWM_CONFIG_PERIOD_NS;
-		c->config_mask |= PWM_CONFIG_PERIOD_TICKS;
-	}
-
-	if (c->config_mask & PWM_CONFIG_DUTY_NS) {
-		c->duty_ticks = pwm_ns_to_ticks(p, c->duty_ns);
-		c->config_mask &= ~PWM_CONFIG_DUTY_NS;
-		c->config_mask |= PWM_CONFIG_DUTY_TICKS;
-	}
-}
-
-static void
-pwm_config_percent_to_ticks(struct pwm_channel *p,
-			    struct pwm_channel_config *c)
-{
-	if (c->config_mask & PWM_CONFIG_DUTY_PERCENT) {
-		if (c->config_mask & PWM_CONFIG_PERIOD_TICKS)
-			c->duty_ticks = c->period_ticks;
-		else
-			c->duty_ticks = p->period_ticks;
-
-		c->duty_ticks *= c->duty_percent;
-		c->duty_ticks /= 100;
-		c->config_mask &= ~PWM_CONFIG_DUTY_PERCENT;
-		c->config_mask |= PWM_CONFIG_DUTY_TICKS;
-	}
-}
-
-int pwm_config_nosleep(struct pwm_channel *p,
-		       struct pwm_channel_config *c)
-{
-	if (!p->pwm->config_nosleep)
-		return -EINVAL;
-
-	pwm_config_ns_to_ticks(p, c);
-	pwm_config_percent_to_ticks(p, c);
-
-	return p->pwm->config_nosleep(p, c);
-}
-EXPORT_SYMBOL(pwm_config_nosleep);
-
-int pwm_config(struct pwm_channel *p,
-	       struct pwm_channel_config *c)
-{
-	int ret = 0;
-
-	if (unlikely(!p->pwm->config))
-		return -EINVAL;
-
-	pwm_config_ns_to_ticks(p, c);
-	pwm_config_percent_to_ticks(p, c);
-
-	switch (c->config_mask & (PWM_CONFIG_PERIOD_TICKS
-				  | PWM_CONFIG_DUTY_TICKS)) {
-	case PWM_CONFIG_PERIOD_TICKS:
-		if (p->duty_ticks > c->period_ticks) {
-			ret = -EINVAL;
-			goto err;
-		}
-		break;
-	case PWM_CONFIG_DUTY_TICKS:
-		if (p->period_ticks < c->duty_ticks) {
-			ret = -EINVAL;
-			goto err;
-		}
-		break;
-	case PWM_CONFIG_DUTY_TICKS | PWM_CONFIG_PERIOD_TICKS:
-		if (c->duty_ticks > c->period_ticks) {
-			ret = -EINVAL;
-			goto err;
-		}
-		break;
-	default:
-		break;
-	}
-
-err:
-	dev_dbg(p->pwm->dev, "%s: config_mask %d period_ticks %lu duty_ticks %lu"
-		" polarity %d duty_ns %lu period_ns %lu duty_percent %d\n",
-		__func__, c->config_mask, c->period_ticks, c->duty_ticks,
-		c->polarity, c->duty_ns, c->period_ns, c->duty_percent);
-
-	if (ret)
-		return ret;
-	return p->pwm->config(p, c);
-}
-EXPORT_SYMBOL(pwm_config);
-
-int pwm_set_period_ns(struct pwm_channel *p,
-		      unsigned long period_ns)
-{
-	struct pwm_channel_config c = {
-		.config_mask = PWM_CONFIG_PERIOD_TICKS,
-		.period_ticks = pwm_ns_to_ticks(p, period_ns),
-	};
-
-	return pwm_config(p, &c);
-}
-EXPORT_SYMBOL(pwm_set_period_ns);
-
-unsigned long pwm_get_period_ns(struct pwm_channel *p)
-{
-	return pwm_ticks_to_ns(p, p->period_ticks);
-}
-EXPORT_SYMBOL(pwm_get_period_ns);
-
-int pwm_set_duty_ns(struct pwm_channel *p,
-		    unsigned long duty_ns)
-{
-	struct pwm_channel_config c = {
-		.config_mask = PWM_CONFIG_DUTY_TICKS,
-		.duty_ticks = pwm_ns_to_ticks(p, duty_ns),
-	};
-	return pwm_config(p, &c);
-}
-EXPORT_SYMBOL(pwm_set_duty_ns);
-
-unsigned long pwm_get_duty_ns(struct pwm_channel *p)
-{
-	return pwm_ticks_to_ns(p, p->duty_ticks);
-}
-EXPORT_SYMBOL(pwm_get_duty_ns);
-
-int pwm_set_duty_percent(struct pwm_channel *p,
-			 int percent)
-{
-	struct pwm_channel_config c = {
-		.config_mask = PWM_CONFIG_DUTY_PERCENT,
-		.duty_percent = percent,
-	};
-	return pwm_config(p, &c);
-}
-EXPORT_SYMBOL(pwm_set_duty_percent);
-
-int pwm_set_polarity(struct pwm_channel *p,
-		     int active_high)
-{
-	struct pwm_channel_config c = {
-		.config_mask = PWM_CONFIG_POLARITY,
-		.polarity = active_high,
-	};
-	return pwm_config(p, &c);
-}
-EXPORT_SYMBOL(pwm_set_polarity);
-
-int pwm_start(struct pwm_channel *p)
-{
-	struct pwm_channel_config c = {
-		.config_mask = PWM_CONFIG_START,
-	};
-	return pwm_config(p, &c);
-}
-EXPORT_SYMBOL(pwm_start);
-
-int pwm_stop(struct pwm_channel *p)
-{
-	struct pwm_channel_config c = {
-		.config_mask = PWM_CONFIG_STOP,
-	};
-	return pwm_config(p, &c);
-}
-EXPORT_SYMBOL(pwm_stop);
-
-int pwm_synchronize(struct pwm_channel *p,
-		    struct pwm_channel *to_p)
-{
-	if (p->pwm != to_p->pwm) {
-		/* TODO: support cross-device synchronization */
-		return -EINVAL;
-	}
-
-	if (!p->pwm->synchronize)
-		return -EINVAL;
-
-	return p->pwm->synchronize(p, to_p);
-}
-EXPORT_SYMBOL(pwm_synchronize);
-
-int pwm_unsynchronize(struct pwm_channel *p,
-		      struct pwm_channel *from_p)
-{
-	if (from_p && (p->pwm != from_p->pwm)) {
-		/* TODO: support cross-device synchronization */
-		return -EINVAL;
-	}
-
-	if (!p->pwm->unsynchronize)
-		return -EINVAL;
-
-	return p->pwm->unsynchronize(p, from_p);
-}
-EXPORT_SYMBOL(pwm_unsynchronize);
-
-static void pwm_handler(struct work_struct *w)
-{
-	struct pwm_channel *p = container_of(w, struct pwm_channel,
-					     handler_work);
-	if (p->handler && p->handler(p, p->handler_data))
-		pwm_stop(p);
-}
-
-static void __pwm_callback(struct pwm_channel *p)
-{
-	queue_work(pwm_handler_workqueue, &p->handler_work);
-	dev_dbg(p->pwm->dev, "handler %p scheduled with data %p\n",
-		p->handler, p->handler_data);
-}
-
-int pwm_set_handler(struct pwm_channel *p,
-		    pwm_handler_t handler,
-		    void *data)
-{
-	if (p->pwm->set_callback) {
-		p->handler_data = data;
-		p->handler = handler;
-		INIT_WORK(&p->handler_work, pwm_handler);
-		return p->pwm->set_callback(p, handler ? __pwm_callback : NULL);
-	}
-	return -EINVAL;
-}
-EXPORT_SYMBOL(pwm_set_handler);
-
-static ssize_t pwm_run_store(struct device *dev,
-			     struct device_attribute *attr,
-			     const char *buf,
-			     size_t len)
-{
-	struct pwm_channel *p = dev_get_drvdata(dev);
-	if (sysfs_streq(buf, "1"))
-		pwm_start(p);
-	else if (sysfs_streq(buf, "0"))
-		pwm_stop(p);
-	return len;
-}
-static DEVICE_ATTR(run, 0200, NULL, pwm_run_store);
-
-static ssize_t pwm_duty_ns_show(struct device *dev,
-				struct device_attribute *attr,
-				char *buf)
-{
-	struct pwm_channel *p = dev_get_drvdata(dev);
-	return sprintf(buf, "%lu\n", pwm_get_duty_ns(p));
-}
-
-static ssize_t pwm_duty_ns_store(struct device *dev,
-				 struct device_attribute *attr,
-				 const char *buf,
-				 size_t len)
-{
-	unsigned long duty_ns;
-	struct pwm_channel *p = dev_get_drvdata(dev);
-
-	if (1 == sscanf(buf, "%lu", &duty_ns))
-		pwm_set_duty_ns(p, duty_ns);
-	return len;
-}
-static DEVICE_ATTR(duty_ns, 0644, pwm_duty_ns_show, pwm_duty_ns_store);
-
-static ssize_t pwm_period_ns_show(struct device *dev,
-				  struct device_attribute *attr,
-				  char *buf)
-{
-	struct pwm_channel *p = dev_get_drvdata(dev);
-	return sprintf(buf, "%lu\n", pwm_get_period_ns(p));
-}
-
-static ssize_t pwm_period_ns_store(struct device *dev,
-				   struct device_attribute *attr,
-				   const char *buf,
-				   size_t len)
-{
-	unsigned long period_ns;
-	struct pwm_channel *p = dev_get_drvdata(dev);
-
-	if (1 == sscanf(buf, "%lu", &period_ns))
-		pwm_set_period_ns(p, period_ns);
-	return len;
-}
-static DEVICE_ATTR(period_ns, 0644, pwm_period_ns_show, pwm_period_ns_store);
-
-static ssize_t pwm_polarity_show(struct device *dev,
-				 struct device_attribute *attr,
-				 char *buf)
-{
-	struct pwm_channel *p = dev_get_drvdata(dev);
-	return sprintf(buf, "%d\n", p->active_high ? 1 : 0);
-}
-
-static ssize_t pwm_polarity_store(struct device *dev,
-				  struct device_attribute *attr,
-				  const char *buf,
-				  size_t len)
-{
-	int polarity;
-	struct pwm_channel *p = dev_get_drvdata(dev);
-
-	if (1 == sscanf(buf, "%d", &polarity))
-		pwm_set_polarity(p, polarity);
-	return len;
-}
-static DEVICE_ATTR(polarity, 0644, pwm_polarity_show, pwm_polarity_store);
-
-static ssize_t pwm_request_show(struct device *dev,
-				struct device_attribute *attr,
-				char *buf)
-{
-	struct pwm_channel *p = dev_get_drvdata(dev);
-	mutex_lock(&device_list_mutex);
-	__pwm_request_channel(p, REQUEST_SYSFS);
-	mutex_unlock(&device_list_mutex);
-
-	if (p->pid)
-		return sprintf(buf, "%s %d\n", p->requester, p->pid);
-	else
-		return sprintf(buf, "%s\n", p->requester);
-}
-
-static ssize_t pwm_request_store(struct device *dev,
-				 struct device_attribute *attr,
-				 const char *buf,
-				 size_t len)
-{
-	struct pwm_channel *p = dev_get_drvdata(dev);
-	pwm_free(p);
-	return len;
-}
-static DEVICE_ATTR(request, 0644, pwm_request_show, pwm_request_store);
-
-static const struct attribute *pwm_attrs[] =
-{
-	&dev_attr_run.attr,
-	&dev_attr_polarity.attr,
-	&dev_attr_duty_ns.attr,
-	&dev_attr_period_ns.attr,
-	&dev_attr_request.attr,
-	NULL,
-};
-
-static const struct attribute_group pwm_device_attr_group = {
-	.attrs = (struct attribute **)pwm_attrs,
-};
-
-static int __pwm_create_sysfs(struct pwm_device *pwm)
-{
-	int ret = 0;
-	struct device *dev;
-	int wchan;
-
-	for (wchan = 0; wchan < pwm->nchan; wchan++) {
-		dev = device_create(&pwm_class, pwm->dev, MKDEV(0, 0),
-				    pwm->channels + wchan,
-				    "%s:%d", pwm->bus_id, wchan);
-		if (!dev)
-			goto err_dev_create;
-		ret = sysfs_create_group(&dev->kobj, &pwm_device_attr_group);
-		if (ret)
-			goto err_dev_create;
-	}
-
-	return ret;
-
-err_dev_create:
-	for (wchan = 0; wchan < pwm->nchan; wchan++) {
-		dev = class_find_device(&pwm_class, NULL,
-					&pwm->channels[wchan],
-					__match_device);
-		if (dev) {
-			put_device(dev);
-			device_unregister(dev);
-		}
-	}
-
-	return ret;
-}
-
-static struct class_attribute pwm_class_attrs[] = {
-	__ATTR_NULL,
-};
-
-static struct class pwm_class = {
-	.name = "pwm",
-	.owner = THIS_MODULE,
-
-	.class_attrs = pwm_class_attrs,
-};
-
-static int __init pwm_init(void)
-{
-	int ret;
-
-	/* TODO: how to deal with devices that register very early? */
-	pr_err("%s\n", __func__);
-	ret = class_register(&pwm_class);
-	if (ret < 0)
-		return ret;
-
-	pwm_handler_workqueue = create_workqueue("pwmd");
-
-	return 0;
-}
-postcore_initcall(pwm_init);