src/peripheral_pwm.c

   1 /*
   2  * Copyright (c) 2017 Samsung Electronics Co., Ltd.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <unistd.h>
  20 #include <assert.h>
  21 #include <system_info.h>
  22
  23 #include "peripheral_io.h"
  24 #include "peripheral_gdbus_pwm.h"
  25 #include "peripheral_common.h"
  26 #include "peripheral_internal.h"
  27
  28 #define PERIPHERAL_IO_PWM_FEATURE "http://tizen.org/feature/peripheral_io.pwm"
  29
  30 #define PWM_FEATURE_UNKNOWN -1
  31 #define PWM_FEATURE_FALSE    0
  32 #define PWM_FEATURE_TRUE     1
  33
  34 static int pwm_feature = PWM_FEATURE_UNKNOWN;
  35
  36 static bool __is_feature_supported()
  37 {
  38         bool feature = false;
  39
  40         if (pwm_feature == PWM_FEATURE_UNKNOWN) {
  41                 system_info_get_platform_bool(PERIPHERAL_IO_PWM_FEATURE, &feature);
  42                 pwm_feature = (feature ? PWM_FEATURE_TRUE : PWM_FEATURE_FALSE);
  43         }
  44
  45         return (pwm_feature == PWM_FEATURE_TRUE ? true : false);
  46 }
  47
  48
  49 int peripheral_pwm_open(int chip, int pin, peripheral_pwm_h *pwm)
  50 {
  51         peripheral_pwm_h handle;
  52         int ret = PERIPHERAL_ERROR_NONE;
  53
  54         RETVM_IF(__is_feature_supported() == false, PERIPHERAL_ERROR_NOT_SUPPORTED, "PWM feature is not supported");
  55         RETVM_IF(pwm == NULL, PERIPHERAL_ERROR_INVALID_PARAMETER, "Invalid pwm handle");
  56         RETVM_IF(chip < 0 || pin < 0, PERIPHERAL_ERROR_INVALID_PARAMETER, "Invalid parameter");
  57
  58         /* Initialize */
  59         handle = (peripheral_pwm_h)calloc(1, sizeof(struct _peripheral_pwm_s));
  60
  61         if (handle == NULL) {
  62                 _E("Failed to allocate peripheral_pwm_h");
  63                 return PERIPHERAL_ERROR_OUT_OF_MEMORY;
  64         }
  65
  66         pwm_proxy_init();
  67
  68         ret = peripheral_gdbus_pwm_open(handle, chip, pin);
  69
  70         if (ret != PERIPHERAL_ERROR_NONE) {
  71                 _E("Failed to open PWM chip : %d, pin : %d", chip, pin);
  72                 free(handle);
  73                 handle = NULL;
  74         }
  75         *pwm = handle;
  76
  77         return ret;
  78 }
  79
  80 int peripheral_pwm_close(peripheral_pwm_h pwm)
  81 {
  82         int ret = PERIPHERAL_ERROR_NONE;
  83
  84         RETVM_IF(__is_feature_supported() == false, PERIPHERAL_ERROR_NOT_SUPPORTED, "PWM feature is not supported");
  85         RETVM_IF(pwm == NULL, PERIPHERAL_ERROR_INVALID_PARAMETER, "pwm handle is NULL");
  86
  87         if ((ret = peripheral_gdbus_pwm_close(pwm)) < 0)
  88                 _E("Failed to close PWM chip, continuing anyway, ret : %d", ret);
  89
  90         pwm_proxy_deinit();
  91         free(pwm);
  92
  93         return ret;
  94 }
  95
  96 int peripheral_pwm_set_period(peripheral_pwm_h pwm, uint32_t period_ns)
  97 {
  98         int ret;
  99
 100         RETVM_IF(__is_feature_supported() == false, PERIPHERAL_ERROR_NOT_SUPPORTED, "PWM feature is not supported");
 101         RETVM_IF(pwm == NULL, PERIPHERAL_ERROR_INVALID_PARAMETER, "pwm handle is NULL");
 102
 103         ret = peripheral_gdbus_pwm_set_period(pwm, (int)period_ns);
 104         if (ret != PERIPHERAL_ERROR_NONE)
 105                 _E("Failed to set period, ret : %d", ret);
 106
 107         return ret;
 108 }
 109
 110 int peripheral_pwm_set_duty_cycle(peripheral_pwm_h pwm, uint32_t duty_cycle_ns)
 111 {
 112         int ret;
 113
 114         RETVM_IF(__is_feature_supported() == false, PERIPHERAL_ERROR_NOT_SUPPORTED, "PWM feature is not supported");
 115         RETVM_IF(pwm == NULL, PERIPHERAL_ERROR_INVALID_PARAMETER, "pwm handle is NULL");
 116
 117         ret = peripheral_gdbus_pwm_set_duty_cycle(pwm, (int)duty_cycle_ns);
 118         if (ret != PERIPHERAL_ERROR_NONE)
 119                 _E("Failed to set duty cycle, ret : %d", ret);
 120
 121         return ret;
 122 }
 123
 124 int peripheral_pwm_set_polarity(peripheral_pwm_h pwm, peripheral_pwm_polarity_e polarity)
 125 {
 126         int ret;
 127
 128         RETVM_IF(__is_feature_supported() == false, PERIPHERAL_ERROR_NOT_SUPPORTED, "PWM feature is not supported");
 129         RETVM_IF(pwm == NULL, PERIPHERAL_ERROR_INVALID_PARAMETER, "pwm handle is NULL");
 130         RETVM_IF((polarity < PERIPHERAL_PWM_POLARITY_ACTIVE_HIGH) || (polarity > PERIPHERAL_PWM_POLARITY_ACTIVE_LOW), PERIPHERAL_ERROR_INVALID_PARAMETER, "Invalid polarity parameter");
 131
 132         ret = peripheral_gdbus_pwm_set_polarity(pwm, polarity);
 133         if (ret != PERIPHERAL_ERROR_NONE)
 134                 _E("Failed to set polarity, ret : %d", ret);
 135
 136         return ret;
 137 }
 138
 139 int peripheral_pwm_set_enabled(peripheral_pwm_h pwm, bool enable)
 140 {
 141         int ret;
 142
 143         RETVM_IF(__is_feature_supported() == false, PERIPHERAL_ERROR_NOT_SUPPORTED, "PWM feature is not supported");
 144         RETVM_IF(pwm == NULL, PERIPHERAL_ERROR_INVALID_PARAMETER, "pwm handle is NULL");
 145
 146         ret = peripheral_gdbus_pwm_set_enable(pwm, enable);
 147         if (ret != PERIPHERAL_ERROR_NONE)
 148                 _E("Failed to set enable, ret : %d", ret);
 149
 150         return ret;
 151 }