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: 37490master
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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|
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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 |
@ -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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|
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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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|
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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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|
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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"); |
@ -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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|
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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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|
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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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|
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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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|
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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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|
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mutex_lock(&device_list_mutex); |
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|
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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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|
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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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|
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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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|
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return 0; |
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} |
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EXPORT_SYMBOL(pwm_unregister); |
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|
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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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|
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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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|
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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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|
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if (test_and_set_bit(FLAG_REQUESTED, &p->flags)) |
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return -EBUSY; |
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|
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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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|
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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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|
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return 0; |
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} |
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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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|
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mutex_lock(&device_list_mutex); |
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|
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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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|
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if (!try_module_get(p->owner)) |
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goto err_module_get_failed; |
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|
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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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|
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mutex_unlock(&device_list_mutex); |
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return &p->channels[chan]; |
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|
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err_request_failed: |
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module_put(p->owner); |
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err_module_get_failed: |
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err_no_device: |
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mutex_unlock(&device_list_mutex); |
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return NULL; |
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} |
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EXPORT_SYMBOL(pwm_request); |
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|
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void pwm_free(struct pwm_channel *p) |
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{ |
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mutex_lock(&device_list_mutex); |
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|
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if (!test_and_clear_bit(FLAG_REQUESTED, &p->flags)) |
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goto done; |
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|
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pwm_stop(p); |
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pwm_unsynchronize(p, NULL); |
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pwm_set_handler(p, NULL, NULL); |
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|
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if (p->pwm->free) |
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p->pwm->free(p); |
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module_put(p->pwm->owner); |
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done: |
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mutex_unlock(&device_list_mutex); |
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} |
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EXPORT_SYMBOL(pwm_free); |
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|
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unsigned long pwm_ns_to_ticks(struct pwm_channel *p, |
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unsigned long nsecs) |
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{ |
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unsigned long long ticks; |
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|
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ticks = nsecs; |
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ticks *= p->tick_hz; |
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do_div(ticks, 1000000000); |
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return ticks; |
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} |
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EXPORT_SYMBOL(pwm_ns_to_ticks); |
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|
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unsigned long pwm_ticks_to_ns(struct pwm_channel *p, |
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unsigned long ticks) |
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{ |
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unsigned long long ns; |
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|
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if (!p->tick_hz) |
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return 0; |
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|
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ns = ticks; |
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ns *= 1000000000UL; |
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do_div(ns, p->tick_hz); |
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return ns; |
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} |
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EXPORT_SYMBOL(pwm_ticks_to_ns); |
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|
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static void |
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pwm_config_ns_to_ticks(struct pwm_channel *p, |
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struct pwm_channel_config *c) |
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{ |
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if (c->config_mask & PWM_CONFIG_PERIOD_NS) { |
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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