| 1 | /* |
| 2 | * include/linux/pwm.h |
| 3 | * |
| 4 | * Copyright (C) 2008 Bill Gatliff < bgat@billgatliff.com> |
| 5 | * |
| 6 | * This program is free software; you may redistribute and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2, as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| 18 | * USA |
| 19 | */ |
| 20 | #ifndef __LINUX_PWM_H |
| 21 | #define __LINUX_PWM_H |
| 22 | |
| 23 | enum { |
| 24 | PWM_CONFIG_DUTY_TICKS = BIT(0), |
| 25 | PWM_CONFIG_PERIOD_TICKS = BIT(1), |
| 26 | PWM_CONFIG_POLARITY = BIT(2), |
| 27 | PWM_CONFIG_START = BIT(3), |
| 28 | PWM_CONFIG_STOP = BIT(4), |
| 29 | |
| 30 | PWM_CONFIG_HANDLER = BIT(5), |
| 31 | |
| 32 | PWM_CONFIG_DUTY_NS = BIT(6), |
| 33 | PWM_CONFIG_DUTY_PERCENT = BIT(7), |
| 34 | PWM_CONFIG_PERIOD_NS = BIT(8), |
| 35 | }; |
| 36 | |
| 37 | struct pwm_channel; |
| 38 | struct work_struct; |
| 39 | |
| 40 | typedef int (*pwm_handler_t)(struct pwm_channel *p, void *data); |
| 41 | typedef void (*pwm_callback_t)(struct pwm_channel *p); |
| 42 | |
| 43 | struct pwm_channel_config { |
| 44 | int config_mask; |
| 45 | unsigned long duty_ticks; |
| 46 | unsigned long period_ticks; |
| 47 | int polarity; |
| 48 | |
| 49 | pwm_handler_t handler; |
| 50 | |
| 51 | unsigned long duty_ns; |
| 52 | unsigned long period_ns; |
| 53 | int duty_percent; |
| 54 | }; |
| 55 | |
| 56 | struct pwm_device { |
| 57 | struct list_head list; |
| 58 | spinlock_t list_lock; |
| 59 | struct device *dev; |
| 60 | struct module *owner; |
| 61 | struct pwm_channel *channels; |
| 62 | |
| 63 | const char *bus_id; |
| 64 | int nchan; |
| 65 | |
| 66 | int (*request) (struct pwm_channel *p); |
| 67 | void (*free) (struct pwm_channel *p); |
| 68 | int (*config) (struct pwm_channel *p, |
| 69 | struct pwm_channel_config *c); |
| 70 | int (*config_nosleep)(struct pwm_channel *p, |
| 71 | struct pwm_channel_config *c); |
| 72 | int (*synchronize) (struct pwm_channel *p, |
| 73 | struct pwm_channel *to_p); |
| 74 | int (*unsynchronize)(struct pwm_channel *p, |
| 75 | struct pwm_channel *from_p); |
| 76 | int (*set_callback) (struct pwm_channel *p, |
| 77 | pwm_callback_t callback); |
| 78 | }; |
| 79 | |
| 80 | int pwm_register(struct pwm_device *pwm); |
| 81 | int pwm_unregister(struct pwm_device *pwm); |
| 82 | |
| 83 | enum { |
| 84 | FLAG_REQUESTED = 0, |
| 85 | FLAG_STOP = 1, |
| 86 | }; |
| 87 | |
| 88 | struct pwm_channel { |
| 89 | struct list_head list; |
| 90 | struct pwm_device *pwm; |
| 91 | const char *requester; |
| 92 | pid_t pid; |
| 93 | int chan; |
| 94 | unsigned long flags; |
| 95 | unsigned long tick_hz; |
| 96 | |
| 97 | spinlock_t lock; |
| 98 | struct completion complete; |
| 99 | |
| 100 | pwm_callback_t callback; |
| 101 | |
| 102 | struct work_struct handler_work; |
| 103 | pwm_handler_t handler; |
| 104 | void *handler_data; |
| 105 | |
| 106 | int active_high; |
| 107 | unsigned long period_ticks; |
| 108 | unsigned long duty_ticks; |
| 109 | }; |
| 110 | |
| 111 | struct gpio_pwm_platform_data { |
| 112 | int gpio; |
| 113 | }; |
| 114 | |
| 115 | struct pwm_channel * |
| 116 | pwm_request(const char *bus_id, int chan, |
| 117 | const char *requester); |
| 118 | |
| 119 | void pwm_free(struct pwm_channel *pwm); |
| 120 | |
| 121 | int pwm_config_nosleep(struct pwm_channel *pwm, |
| 122 | struct pwm_channel_config *c); |
| 123 | |
| 124 | int pwm_config(struct pwm_channel *pwm, |
| 125 | struct pwm_channel_config *c); |
| 126 | |
| 127 | unsigned long pwm_ns_to_ticks(struct pwm_channel *pwm, |
| 128 | unsigned long nsecs); |
| 129 | |
| 130 | unsigned long pwm_ticks_to_ns(struct pwm_channel *pwm, |
| 131 | unsigned long ticks); |
| 132 | |
| 133 | int pwm_set_period_ns(struct pwm_channel *pwm, |
| 134 | unsigned long period_ns); |
| 135 | |
| 136 | unsigned long int pwm_get_period_ns(struct pwm_channel *pwm); |
| 137 | |
| 138 | int pwm_set_duty_ns(struct pwm_channel *pwm, |
| 139 | unsigned long duty_ns); |
| 140 | |
| 141 | int pwm_set_duty_percent(struct pwm_channel *pwm, |
| 142 | int percent); |
| 143 | |
| 144 | unsigned long pwm_get_duty_ns(struct pwm_channel *pwm); |
| 145 | |
| 146 | int pwm_set_polarity(struct pwm_channel *pwm, |
| 147 | int active_high); |
| 148 | |
| 149 | int pwm_start(struct pwm_channel *pwm); |
| 150 | |
| 151 | int pwm_stop(struct pwm_channel *pwm); |
| 152 | |
| 153 | int pwm_set_handler(struct pwm_channel *pwm, |
| 154 | pwm_handler_t handler, |
| 155 | void *data); |
| 156 | |
| 157 | int pwm_synchronize(struct pwm_channel *p, |
| 158 | struct pwm_channel *to_p); |
| 159 | |
| 160 | |
| 161 | int pwm_unsynchronize(struct pwm_channel *p, |
| 162 | struct pwm_channel *from_p); |
| 163 | |
| 164 | |
| 165 | #endif /* __LINUX_PWM_H */ |
| 166 | |
