git.sur5r.net Git - u-boot/blob - drivers/pwm/sandbox_pwm.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2015 Google, Inc
   4  * Written by Simon Glass <sjg@chromium.org>
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <errno.h>
  10 #include <pwm.h>
  11 #include <asm/test.h>
  12
  13 enum {
  14         NUM_CHANNELS    = 3,
  15 };
  16
  17 struct sandbox_pwm_chan {
  18         uint period_ns;
  19         uint duty_ns;
  20         bool enable;
  21         bool polarity;
  22 };
  23
  24 struct sandbox_pwm_priv {
  25         struct sandbox_pwm_chan chan[NUM_CHANNELS];
  26 };
  27
  28 static int sandbox_pwm_set_config(struct udevice *dev, uint channel,
  29                                   uint period_ns, uint duty_ns)
  30 {
  31         struct sandbox_pwm_priv *priv = dev_get_priv(dev);
  32         struct sandbox_pwm_chan *chan;
  33
  34         if (channel >= NUM_CHANNELS)
  35                 return -ENOSPC;
  36         chan = &priv->chan[channel];
  37         chan->period_ns = period_ns;
  38         chan->duty_ns = duty_ns;
  39
  40         return 0;
  41 }
  42
  43 static int sandbox_pwm_set_enable(struct udevice *dev, uint channel,
  44                                   bool enable)
  45 {
  46         struct sandbox_pwm_priv *priv = dev_get_priv(dev);
  47         struct sandbox_pwm_chan *chan;
  48
  49         if (channel >= NUM_CHANNELS)
  50                 return -ENOSPC;
  51         chan = &priv->chan[channel];
  52         chan->enable = enable;
  53
  54         return 0;
  55 }
  56
  57 static int sandbox_pwm_set_invert(struct udevice *dev, uint channel,
  58                                   bool polarity)
  59 {
  60         struct sandbox_pwm_priv *priv = dev_get_priv(dev);
  61         struct sandbox_pwm_chan *chan;
  62
  63         if (channel >= NUM_CHANNELS)
  64                 return -ENOSPC;
  65         chan = &priv->chan[channel];
  66         chan->polarity = polarity;
  67
  68         return 0;
  69 }
  70
  71 static const struct pwm_ops sandbox_pwm_ops = {
  72         .set_config     = sandbox_pwm_set_config,
  73         .set_enable     = sandbox_pwm_set_enable,
  74         .set_invert     = sandbox_pwm_set_invert,
  75 };
  76
  77 static const struct udevice_id sandbox_pwm_ids[] = {
  78         { .compatible = "sandbox,pwm" },
  79         { }
  80 };
  81
  82 U_BOOT_DRIVER(warm_pwm_sandbox) = {
  83         .name           = "pwm_sandbox",
  84         .id             = UCLASS_PWM,
  85         .of_match       = sandbox_pwm_ids,
  86         .ops            = &sandbox_pwm_ops,
  87         .priv_auto_alloc_size   = sizeof(struct sandbox_pwm_priv),
  88 };