diff options
Diffstat (limited to 'include/linux/pwm.h')
| -rw-r--r-- | include/linux/pwm.h | 169 |
1 files changed, 150 insertions, 19 deletions
diff --git a/include/linux/pwm.h b/include/linux/pwm.h index 3945f803d514..bf33edec0761 100644 --- a/include/linux/pwm.h +++ b/include/linux/pwm.h @@ -1,31 +1,162 @@ #ifndef __LINUX_PWM_H #define __LINUX_PWM_H +#include <linux/workqueue.h> + struct pwm_device; /* - * pwm_request - request a PWM device + * include/linux/pwm.h + * + * Copyright (C) 2008 Bill Gatliff + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ -struct pwm_device *pwm_request(int pwm_id, const char *label); -/* - * pwm_free - free a PWM device - */ -void pwm_free(struct pwm_device *pwm); +enum { + PWM_CONFIG_DUTY_TICKS = BIT(0), + PWM_CONFIG_PERIOD_TICKS = BIT(1), + PWM_CONFIG_POLARITY = BIT(2), + PWM_CONFIG_START = BIT(3), + PWM_CONFIG_STOP = BIT(4), + PWM_CONFIG_HANDLER = BIT(5), + PWM_CONFIG_DUTY_NS = BIT(6), + PWM_CONFIG_DUTY_PERCENT = BIT(7), + PWM_CONFIG_PERIOD_NS = BIT(8), +}; -/* - * pwm_config - change a PWM device configuration - */ -int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns); +struct pwm_channel; +struct work_struct; -/* - * pwm_enable - start a PWM output toggling - */ -int pwm_enable(struct pwm_device *pwm); +typedef int (*pwm_handler_t)(struct pwm_channel *p, void *data); +typedef void (*pwm_callback_t)(struct pwm_channel *p); -/* - * pwm_disable - stop a PWM output toggling - */ -void pwm_disable(struct pwm_device *pwm); +struct pwm_channel_config { + int config_mask; + unsigned long duty_ticks; + unsigned long period_ticks; + int polarity; + + pwm_handler_t handler; + + unsigned long duty_ns; + unsigned long period_ns; + int duty_percent; +}; + +struct pwm_device { + struct list_head list; + spinlock_t list_lock; + struct device *dev; + struct module *owner; + struct pwm_channel *channels; + + const char *bus_id; + int nchan; + + int (*request) (struct pwm_channel *p); + void (*free) (struct pwm_channel *p); + int (*config) (struct pwm_channel *p, + struct pwm_channel_config *c); + int (*config_nosleep)(struct pwm_channel *p, + struct pwm_channel_config *c); + int (*synchronize) (struct pwm_channel *p, + struct pwm_channel *to_p); + int (*unsynchronize)(struct pwm_channel *p, + struct pwm_channel *from_p); + int (*set_callback) (struct pwm_channel *p, + pwm_callback_t callback); +}; + +int pwm_register(struct pwm_device *pwm); +int pwm_unregister(struct pwm_device *pwm); + +enum { + FLAG_REQUESTED = 0, + FLAG_STOP = 1, +}; + +struct pwm_channel { + struct list_head list; + struct pwm_device *pwm; + const char *requester; + int chan; + unsigned long flags; + unsigned long tick_hz; + + spinlock_t lock; + struct completion complete; + + pwm_callback_t callback; + + struct work_struct handler_work; + pwm_handler_t handler; + void *handler_data; + + int active_low; + unsigned long period_ticks; + unsigned long duty_ticks; +}; + +struct pwm_channel * +pwm_request(const char *bus_id, int chan, + const char *requester); + +void pwm_free(struct pwm_channel *pwm); + +int pwm_config_nosleep(struct pwm_channel *pwm, + struct pwm_channel_config *c); + +int pwm_config(struct pwm_channel *pwm, + struct pwm_channel_config *c); + +unsigned long pwm_ns_to_ticks(struct pwm_channel *pwm, + unsigned long nsecs); + +unsigned long pwm_ticks_to_ns(struct pwm_channel *pwm, + unsigned long ticks); + +int pwm_set_period_ns(struct pwm_channel *pwm, + unsigned long period_ns); + +unsigned long int pwm_get_period_ns(struct pwm_channel *pwm); + +int pwm_set_duty_ns(struct pwm_channel *pwm, + unsigned long duty_ns); + +int pwm_set_duty_percent(struct pwm_channel *pwm, + int percent); + +unsigned long pwm_get_duty_ns(struct pwm_channel *pwm); + +int pwm_set_polarity(struct pwm_channel *pwm, + int active_high); + +int pwm_start(struct pwm_channel *pwm); + +int pwm_stop(struct pwm_channel *pwm); + +int pwm_set_handler(struct pwm_channel *pwm, + pwm_handler_t handler, + void *data); + +int pwm_synchronize(struct pwm_channel *p, + struct pwm_channel *to_p); + + +int pwm_unsynchronize(struct pwm_channel *p, + struct pwm_channel *from_p); -#endif /* __ASM_ARCH_PWM_H */ +#endif /* __LINUX_PWM_H */ |