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> SVN-Revision: 37490v19.07.3_mercusys_ac12_duma
Lars-Peter Clausen
11 years ago
parent
11c5730695
commit
8fc44d1f5f
@ -1,20 +0,0 @@
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#
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# PWM infrastructure and devices
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#
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menuconfig GENERIC_PWM
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tristate "PWM Support"
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depends on SYSFS
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help
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This enables PWM support through the generic PWM library.
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If unsure, say N.
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if GENERIC_PWM
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config GPIO_PWM
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tristate "PWM emulation using GPIO"
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help
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This option enables a single-channel PWM device using
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a kernel interval timer and a GPIO pin. If unsure, say N.
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endif
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@ -1,5 +0,0 @@
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#
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# Makefile for pwm devices
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#
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obj-$(CONFIG_GENERIC_PWM) := pwm.o
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obj-$(CONFIG_GPIO_PWM) += gpio-pwm.o
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@ -1,298 +0,0 @@
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/*
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* drivers/pwm/gpio.c
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*
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* Models a single-channel PWM device using a timer and a GPIO pin.
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*
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* Copyright (C) 2010 Bill Gatliff <bgat@billgatliff.com>
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*
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* This program is free software; you may redistribute and/or modify
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* it under the terms of the GNU General Public License Version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/hrtimer.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/workqueue.h>
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#include <linux/gpio.h>
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#include <linux/slab.h>
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#include <linux/pwm/pwm.h>
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struct gpio_pwm {
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struct pwm_device pwm;
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struct hrtimer timer;
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struct work_struct work;
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pwm_callback_t callback;
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int gpio;
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unsigned long polarity : 1;
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unsigned long active : 1;
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};
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static inline struct gpio_pwm *to_gpio_pwm(const struct pwm_channel *p)
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{
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return container_of(p->pwm, struct gpio_pwm, pwm);
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}
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static void
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gpio_pwm_work (struct work_struct *work)
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{
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struct gpio_pwm *gp = container_of(work, struct gpio_pwm, work);
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if (gp->active)
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gpio_direction_output(gp->gpio, gp->polarity ? 1 : 0);
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else
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gpio_direction_output(gp->gpio, gp->polarity ? 0 : 1);
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}
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static enum hrtimer_restart
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gpio_pwm_timeout(struct hrtimer *t)
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{
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struct gpio_pwm *gp = container_of(t, struct gpio_pwm, timer);
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ktime_t tnew;
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if (unlikely(gp->pwm.channels[0].duty_ticks == 0))
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gp->active = 0;
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else if (unlikely(gp->pwm.channels[0].duty_ticks
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== gp->pwm.channels[0].period_ticks))
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gp->active = 1;
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else
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gp->active ^= 1;
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if (gpio_cansleep(gp->gpio))
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schedule_work(&gp->work);
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else
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gpio_pwm_work(&gp->work);
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if (!gp->active && gp->pwm.channels[0].callback)
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gp->pwm.channels[0].callback(&gp->pwm.channels[0]);
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if (unlikely(!gp->active &&
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(gp->pwm.channels[0].flags & BIT(FLAG_STOP)))) {
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clear_bit(FLAG_STOP, &gp->pwm.channels[0].flags);
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complete_all(&gp->pwm.channels[0].complete);
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return HRTIMER_NORESTART;
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}
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if (gp->active)
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tnew = ktime_set(0, gp->pwm.channels[0].duty_ticks);
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else
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tnew = ktime_set(0, gp->pwm.channels[0].period_ticks
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- gp->pwm.channels[0].duty_ticks);
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hrtimer_start(&gp->timer, tnew, HRTIMER_MODE_REL);
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return HRTIMER_NORESTART;
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}
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static void gpio_pwm_start(struct pwm_channel *p)
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{
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struct gpio_pwm *gp = to_gpio_pwm(p);
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gp->active = 0;
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gpio_pwm_timeout(&gp->timer);
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}
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static int
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gpio_pwm_config_nosleep(struct pwm_channel *p,
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struct pwm_channel_config *c)
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{
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struct gpio_pwm *gp = to_gpio_pwm(p);
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int ret = 0;
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unsigned long flags;
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spin_lock_irqsave(&p->lock, flags);
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switch (c->config_mask) {
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case PWM_CONFIG_DUTY_TICKS:
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p->duty_ticks = c->duty_ticks;
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break;
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case PWM_CONFIG_START:
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if (!hrtimer_active(&gp->timer)) {
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gpio_pwm_start(p);
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}
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break;
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default:
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ret = -EINVAL;
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break;
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}
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spin_unlock_irqrestore(&p->lock, flags);
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return ret;
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}
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static int
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gpio_pwm_stop_sync(struct pwm_channel *p)
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{
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struct gpio_pwm *gp = to_gpio_pwm(p);
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int ret;
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int was_on = hrtimer_active(&gp->timer);
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if (was_on) {
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do {
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init_completion(&p->complete);
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set_bit(FLAG_STOP, &p->flags);
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ret = wait_for_completion_interruptible(&p->complete);
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if (ret)
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return ret;
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} while (p->flags & BIT(FLAG_STOP));
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}
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return was_on;
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}
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static int
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gpio_pwm_config(struct pwm_channel *p,
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struct pwm_channel_config *c)
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{
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struct gpio_pwm *gp = to_gpio_pwm(p);
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int was_on = 0;
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if (p->pwm->config_nosleep) {
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if (!p->pwm->config_nosleep(p, c))
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return 0;
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}
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might_sleep();
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was_on = gpio_pwm_stop_sync(p);
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if (was_on < 0)
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return was_on;
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if (c->config_mask & PWM_CONFIG_PERIOD_TICKS)
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p->period_ticks = c->period_ticks;
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if (c->config_mask & PWM_CONFIG_DUTY_TICKS)
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p->duty_ticks = c->duty_ticks;
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if (c->config_mask & PWM_CONFIG_POLARITY) {
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gp->polarity = c->polarity ? 1 : 0;
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p->active_high = gp->polarity;
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}
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if ((c->config_mask & PWM_CONFIG_START)
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|| (was_on && !(c->config_mask & PWM_CONFIG_STOP)))
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gpio_pwm_start(p);
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return 0;
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}
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static int
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gpio_pwm_set_callback(struct pwm_channel *p,
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pwm_callback_t callback)
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{
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struct gpio_pwm *gp = to_gpio_pwm(p);
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gp->callback = callback;
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return 0;
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}
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static int
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gpio_pwm_request(struct pwm_channel *p)
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{
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p->tick_hz = 1000000000UL;
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return 0;
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}
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static int
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gpio_pwm_probe(struct platform_device *pdev)
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{
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struct gpio_pwm *gp;
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struct gpio_pwm_platform_data *gpd = pdev->dev.platform_data;
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int ret = 0;
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/* TODO: create configfs entries, so users can assign GPIOs to
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* PWMs at runtime instead of creating a platform_device
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* specification and rebuilding their kernel */
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if (!gpd || gpio_request(gpd->gpio, dev_name(&pdev->dev)))
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return -EINVAL;
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gp = kzalloc(sizeof(*gp), GFP_KERNEL);
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if (!gp) {
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ret = -ENOMEM;
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goto err_alloc;
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}
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platform_set_drvdata(pdev, gp);
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gp->pwm.dev = &pdev->dev;
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gp->pwm.bus_id = dev_name(&pdev->dev);
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gp->pwm.nchan = 1;
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gp->gpio = gpd->gpio;
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INIT_WORK(&gp->work, gpio_pwm_work);
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hrtimer_init(&gp->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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gp->timer.function = gpio_pwm_timeout;
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gp->pwm.owner = THIS_MODULE;
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gp->pwm.config_nosleep = gpio_pwm_config_nosleep;
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gp->pwm.config = gpio_pwm_config;
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gp->pwm.request = gpio_pwm_request;
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gp->pwm.set_callback = gpio_pwm_set_callback;
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ret = pwm_register(&gp->pwm);
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if (ret)
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goto err_pwm_register;
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return 0;
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err_pwm_register:
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platform_set_drvdata(pdev, 0);
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kfree(gp);
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err_alloc:
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return ret;
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}
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static int
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gpio_pwm_remove(struct platform_device *pdev)
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{
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struct gpio_pwm *gp = platform_get_drvdata(pdev);
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int ret;
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ret = pwm_unregister(&gp->pwm);
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hrtimer_cancel(&gp->timer);
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cancel_work_sync(&gp->work);
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platform_set_drvdata(pdev, 0);
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kfree(gp);
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return 0;
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}
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static struct platform_driver gpio_pwm_driver = {
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.driver = {
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.name = "gpio_pwm",
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.owner = THIS_MODULE,
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},
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.probe = gpio_pwm_probe,
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.remove = gpio_pwm_remove,
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};
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static int __init gpio_pwm_init(void)
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{
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return platform_driver_register(&gpio_pwm_driver);
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}
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module_init(gpio_pwm_init);
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static void __exit gpio_pwm_exit(void)
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{
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platform_driver_unregister(&gpio_pwm_driver);
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}
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module_exit(gpio_pwm_exit);
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MODULE_AUTHOR("Bill Gatliff <bgat@billgatliff.com>");
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MODULE_DESCRIPTION("PWM output using GPIO and a high-resolution timer");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:gpio_pwm");
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@ -1,643 +0,0 @@
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/*
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* drivers/pwm/pwm.c
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*
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* Copyright (C) 2010 Bill Gatliff <bgat@billgatliff.com>
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*
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* This program is free software; you may redistribute and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/spinlock.h>
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#include <linux/fs.h>
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#include <linux/completion.h>
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#include <linux/workqueue.h>
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#include <linux/list.h>
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#include <linux/sched.h>
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#include <linux/slab.h> /*kcalloc, kfree since 2.6.34 */
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#include <linux/pwm/pwm.h>
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static int __pwm_create_sysfs(struct pwm_device *pwm);
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static const char *REQUEST_SYSFS = "sysfs";
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static LIST_HEAD(pwm_device_list);
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static DEFINE_MUTEX(device_list_mutex);
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static struct class pwm_class;
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static struct workqueue_struct *pwm_handler_workqueue;
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int pwm_register(struct pwm_device *pwm)
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{
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struct pwm_channel *p;
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int wchan;
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int ret;
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spin_lock_init(&pwm->list_lock);
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p = kcalloc(pwm->nchan, sizeof(*p), GFP_KERNEL);
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if (!p)
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return -ENOMEM;
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for (wchan = 0; wchan < pwm->nchan; wchan++) {
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spin_lock_init(&p[wchan].lock);
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init_completion(&p[wchan].complete);
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p[wchan].chan = wchan;
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p[wchan].pwm = pwm;
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}
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pwm->channels = p;
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mutex_lock(&device_list_mutex);
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list_add_tail(&pwm->list, &pwm_device_list);
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ret = __pwm_create_sysfs(pwm);
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if (ret) {
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mutex_unlock(&device_list_mutex);
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goto err_create_sysfs;
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}
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mutex_unlock(&device_list_mutex);
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dev_info(pwm->dev, "%d channel%s\n", pwm->nchan,
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pwm->nchan > 1 ? "s" : "");
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return 0;
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err_create_sysfs:
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kfree(p);
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return ret;
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}
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EXPORT_SYMBOL(pwm_register);
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static int __match_device(struct device *dev, void *data)
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{
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return dev_get_drvdata(dev) == data;
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}
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int pwm_unregister(struct pwm_device *pwm)
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{
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int wchan;
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struct device *dev;
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mutex_lock(&device_list_mutex);
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for (wchan = 0; wchan < pwm->nchan; wchan++) {
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if (pwm->channels[wchan].flags & BIT(FLAG_REQUESTED)) {
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mutex_unlock(&device_list_mutex);
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return -EBUSY;
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}
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}
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for (wchan = 0; wchan < pwm->nchan; wchan++) {
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dev = class_find_device(&pwm_class, NULL,
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&pwm->channels[wchan],
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__match_device);
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if (dev) {
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put_device(dev);
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device_unregister(dev);
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}
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}
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kfree(pwm->channels);
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list_del(&pwm->list);
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mutex_unlock(&device_list_mutex);
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return 0;
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}
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EXPORT_SYMBOL(pwm_unregister);
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static struct pwm_device *
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__pwm_find_device(const char *bus_id)
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{
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struct pwm_device *p;
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list_for_each_entry(p, &pwm_device_list, list) {
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if (!strcmp(bus_id, p->bus_id))
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return p;
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}
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return NULL;
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}
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static int
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__pwm_request_channel(struct pwm_channel *p,
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const char *requester)
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{
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int ret;
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if (test_and_set_bit(FLAG_REQUESTED, &p->flags))
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return -EBUSY;
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if (p->pwm->request) {
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ret = p->pwm->request(p);
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if (ret) {
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clear_bit(FLAG_REQUESTED, &p->flags);
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return ret;
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}
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}
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p->requester = requester;
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if (!strcmp(requester, REQUEST_SYSFS))
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p->pid = current->pid;
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return 0;
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}
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struct pwm_channel *
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pwm_request(const char *bus_id,
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int chan,
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const char *requester)
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{
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struct pwm_device *p;
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int ret;
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mutex_lock(&device_list_mutex);
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p = __pwm_find_device(bus_id);
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if (!p || chan >= p->nchan)
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goto err_no_device;
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if (!try_module_get(p->owner))
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goto err_module_get_failed;
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ret = __pwm_request_channel(&p->channels[chan], requester);
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if (ret)
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goto err_request_failed;
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mutex_unlock(&device_list_mutex);
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||||
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);
|
||||
@ -1,21 +0,0 @@
|
||||
--- a/drivers/Kconfig
|
||||
+++ b/drivers/Kconfig
|
||||
@@ -64,6 +64,8 @@ source "drivers/pinctrl/Kconfig"
|
||||
|
||||
source "drivers/gpio/Kconfig"
|
||||
|
||||
+source "drivers/pwm/Kconfig"
|
||||
+
|
||||
source "drivers/w1/Kconfig"
|
||||
|
||||
source "drivers/power/Kconfig"
|
||||
--- a/drivers/Makefile
|
||||
+++ b/drivers/Makefile
|
||||
@@ -13,6 +13,7 @@ obj-y += pinctrl/
|
||||
obj-y += gpio/
|
||||
obj-y += pwm/
|
||||
obj-$(CONFIG_PCI) += pci/
|
||||
+obj-$(CONFIG_GENERIC_PWM) += pwm/
|
||||
obj-$(CONFIG_PARISC) += parisc/
|
||||
obj-$(CONFIG_RAPIDIO) += rapidio/
|
||||
obj-y += video/
|
||||
@ -1,21 +0,0 @@
|
||||
--- a/drivers/Kconfig
|
||||
+++ b/drivers/Kconfig
|
||||
@@ -60,6 +60,8 @@ source "drivers/pinctrl/Kconfig"
|
||||
|
||||
source "drivers/gpio/Kconfig"
|
||||
|
||||
+source "drivers/pwm/Kconfig"
|
||||
+
|
||||
source "drivers/w1/Kconfig"
|
||||
|
||||
source "drivers/power/Kconfig"
|
||||
--- a/drivers/Makefile
|
||||
+++ b/drivers/Makefile
|
||||
@@ -8,6 +8,7 @@
|
||||
# GPIO must come after pinctrl as gpios may need to mux pins etc
|
||||
obj-y += pinctrl/
|
||||
obj-y += gpio/
|
||||
+obj-$(CONFIG_GENERIC_PWM) += pwm/
|
||||
obj-$(CONFIG_PCI) += pci/
|
||||
obj-$(CONFIG_PARISC) += parisc/
|
||||
obj-$(CONFIG_RAPIDIO) += rapidio/
|
||||
@ -1,21 +0,0 @@
|
||||
--- a/drivers/Kconfig
|
||||
+++ b/drivers/Kconfig
|
||||
@@ -60,6 +60,8 @@ source "drivers/pinctrl/Kconfig"
|
||||
|
||||
source "drivers/gpio/Kconfig"
|
||||
|
||||
+source "drivers/pwm/Kconfig"
|
||||
+
|
||||
source "drivers/w1/Kconfig"
|
||||
|
||||
source "drivers/power/Kconfig"
|
||||
--- a/drivers/Makefile
|
||||
+++ b/drivers/Makefile
|
||||
@@ -10,6 +10,7 @@ obj-y += pinctrl/
|
||||
obj-y += gpio/
|
||||
obj-y += pwm/
|
||||
obj-$(CONFIG_PCI) += pci/
|
||||
+obj-$(CONFIG_GENERIC_PWM) += pwm/
|
||||
obj-$(CONFIG_PARISC) += parisc/
|
||||
obj-$(CONFIG_RAPIDIO) += rapidio/
|
||||
obj-y += video/
|
||||
@ -1,21 +0,0 @@
|
||||
--- a/drivers/Kconfig
|
||||
+++ b/drivers/Kconfig
|
||||
@@ -62,6 +62,8 @@ source "drivers/pinctrl/Kconfig"
|
||||
|
||||
source "drivers/gpio/Kconfig"
|
||||
|
||||
+source "drivers/pwm/Kconfig"
|
||||
+
|
||||
source "drivers/w1/Kconfig"
|
||||
|
||||
source "drivers/power/Kconfig"
|
||||
--- a/drivers/Makefile
|
||||
+++ b/drivers/Makefile
|
||||
@@ -13,6 +13,7 @@ obj-y += pinctrl/
|
||||
obj-y += gpio/
|
||||
obj-y += pwm/
|
||||
obj-$(CONFIG_PCI) += pci/
|
||||
+obj-$(CONFIG_GENERIC_PWM) += pwm/
|
||||
obj-$(CONFIG_PARISC) += parisc/
|
||||
obj-$(CONFIG_RAPIDIO) += rapidio/
|
||||
obj-y += video/
|
||||
@ -1,21 +0,0 @@
|
||||
--- a/drivers/Kconfig
|
||||
+++ b/drivers/Kconfig
|
||||
@@ -62,6 +62,8 @@ source "drivers/pinctrl/Kconfig"
|
||||
|
||||
source "drivers/gpio/Kconfig"
|
||||
|
||||
+source "drivers/pwm/Kconfig"
|
||||
+
|
||||
source "drivers/w1/Kconfig"
|
||||
|
||||
source "drivers/power/Kconfig"
|
||||
--- a/drivers/Makefile
|
||||
+++ b/drivers/Makefile
|
||||
@@ -13,6 +13,7 @@ obj-y += pinctrl/
|
||||
obj-y += gpio/
|
||||
obj-y += pwm/
|
||||
obj-$(CONFIG_PCI) += pci/
|
||||
+obj-$(CONFIG_GENERIC_PWM) += pwm/
|
||||
obj-$(CONFIG_PARISC) += parisc/
|
||||
obj-$(CONFIG_RAPIDIO) += rapidio/
|
||||
obj-y += video/
|
||||
Loading…
Reference in New Issue