drivers/pwm/sandbox_pwm.c

   1 /*
   2  * Copyright (c) 2015 Google, Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <errno.h>
  11 #include <pwm.h>
  12 #include <asm/test.h>
  13
  14 DECLARE_GLOBAL_DATA_PTR;
  15
  16 enum {
  17         NUM_CHANNELS    = 3,
  18 };
  19
  20 struct sandbox_pwm_chan {
  21         uint period_ns;
  22         uint duty_ns;
  23         bool enable;
  24         bool polarity;
  25 };
  26
  27 struct sandbox_pwm_priv {
  28         struct sandbox_pwm_chan chan[NUM_CHANNELS];
  29 };
  30
  31 static int sandbox_pwm_set_config(struct udevice *dev, uint channel,
  32                                   uint period_ns, uint duty_ns)
  33 {
  34         struct sandbox_pwm_priv *priv = dev_get_priv(dev);
  35         struct sandbox_pwm_chan *chan;
  36
  37         if (channel >= NUM_CHANNELS)
  38                 return -ENOSPC;
  39         chan = &priv->chan[channel];
  40         chan->period_ns = period_ns;
  41         chan->duty_ns = duty_ns;
  42
  43         return 0;
  44 }
  45
  46 static int sandbox_pwm_set_enable(struct udevice *dev, uint channel,
  47                                   bool enable)
  48 {
  49         struct sandbox_pwm_priv *priv = dev_get_priv(dev);
  50         struct sandbox_pwm_chan *chan;
  51
  52         if (channel >= NUM_CHANNELS)
  53                 return -ENOSPC;
  54         chan = &priv->chan[channel];
  55         chan->enable = enable;
  56
  57         return 0;
  58 }
  59
  60 static int sandbox_pwm_set_invert(struct udevice *dev, uint channel,
  61                                   bool polarity)
  62 {
  63         struct sandbox_pwm_priv *priv = dev_get_priv(dev);
  64         struct sandbox_pwm_chan *chan;
  65
  66         if (channel >= NUM_CHANNELS)
  67                 return -ENOSPC;
  68         chan = &priv->chan[channel];
  69         chan->polarity = polarity;
  70
  71         return 0;
  72 }
  73
  74 static const struct pwm_ops sandbox_pwm_ops = {
  75         .set_config     = sandbox_pwm_set_config,
  76         .set_enable     = sandbox_pwm_set_enable,
  77         .set_invert     = sandbox_pwm_set_invert,
  78 };
  79
  80 static const struct udevice_id sandbox_pwm_ids[] = {
  81         { .compatible = "sandbox,pwm" },
  82         { }
  83 };
  84
  85 U_BOOT_DRIVER(warm_pwm_sandbox) = {
  86         .name           = "pwm_sandbox",
  87         .id             = UCLASS_PWM,
  88         .of_match       = sandbox_pwm_ids,
  89         .ops            = &sandbox_pwm_ops,
  90         .priv_auto_alloc_size   = sizeof(struct sandbox_pwm_priv),
  91 };