git.sur5r.net Git - u-boot/blob - 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 enum {
  15         NUM_CHANNELS    = 3,
  16 };
  17
  18 struct sandbox_pwm_chan {
  19         uint period_ns;
  20         uint duty_ns;
  21         bool enable;
  22         bool polarity;
  23 };
  24
  25 struct sandbox_pwm_priv {
  26         struct sandbox_pwm_chan chan[NUM_CHANNELS];
  27 };
  28
  29 static int sandbox_pwm_set_config(struct udevice *dev, uint channel,
  30                                   uint period_ns, uint duty_ns)
  31 {
  32         struct sandbox_pwm_priv *priv = dev_get_priv(dev);
  33         struct sandbox_pwm_chan *chan;
  34
  35         if (channel >= NUM_CHANNELS)
  36                 return -ENOSPC;
  37         chan = &priv->chan[channel];
  38         chan->period_ns = period_ns;
  39         chan->duty_ns = duty_ns;
  40
  41         return 0;
  42 }
  43
  44 static int sandbox_pwm_set_enable(struct udevice *dev, uint channel,
  45                                   bool enable)
  46 {
  47         struct sandbox_pwm_priv *priv = dev_get_priv(dev);
  48         struct sandbox_pwm_chan *chan;
  49
  50         if (channel >= NUM_CHANNELS)
  51                 return -ENOSPC;
  52         chan = &priv->chan[channel];
  53         chan->enable = enable;
  54
  55         return 0;
  56 }
  57
  58 static int sandbox_pwm_set_invert(struct udevice *dev, uint channel,
  59                                   bool polarity)
  60 {
  61         struct sandbox_pwm_priv *priv = dev_get_priv(dev);
  62         struct sandbox_pwm_chan *chan;
  63
  64         if (channel >= NUM_CHANNELS)
  65                 return -ENOSPC;
  66         chan = &priv->chan[channel];
  67         chan->polarity = polarity;
  68
  69         return 0;
  70 }
  71
  72 static const struct pwm_ops sandbox_pwm_ops = {
  73         .set_config     = sandbox_pwm_set_config,
  74         .set_enable     = sandbox_pwm_set_enable,
  75         .set_invert     = sandbox_pwm_set_invert,
  76 };
  77
  78 static const struct udevice_id sandbox_pwm_ids[] = {
  79         { .compatible = "sandbox,pwm" },
  80         { }
  81 };
  82
  83 U_BOOT_DRIVER(warm_pwm_sandbox) = {
  84         .name           = "pwm_sandbox",
  85         .id             = UCLASS_PWM,
  86         .of_match       = sandbox_pwm_ids,
  87         .ops            = &sandbox_pwm_ops,
  88         .priv_auto_alloc_size   = sizeof(struct sandbox_pwm_priv),
  89 };