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 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 };
  25
  26 struct sandbox_pwm_priv {
  27         struct sandbox_pwm_chan chan[NUM_CHANNELS];
  28 };
  29
  30 static int sandbox_pwm_set_config(struct udevice *dev, uint channel,
  31                                   uint period_ns, uint duty_ns)
  32 {
  33         struct sandbox_pwm_priv *priv = dev_get_priv(dev);
  34         struct sandbox_pwm_chan *chan;
  35
  36         if (channel >= NUM_CHANNELS)
  37                 return -ENOSPC;
  38         chan = &priv->chan[channel];
  39         chan->period_ns = period_ns;
  40         chan->duty_ns = duty_ns;
  41
  42         return 0;
  43 }
  44
  45 static int sandbox_pwm_set_enable(struct udevice *dev, uint channel,
  46                                   bool enable)
  47 {
  48         struct sandbox_pwm_priv *priv = dev_get_priv(dev);
  49         struct sandbox_pwm_chan *chan;
  50
  51         if (channel >= NUM_CHANNELS)
  52                 return -ENOSPC;
  53         chan = &priv->chan[channel];
  54         chan->enable = enable;
  55
  56         return 0;
  57 }
  58
  59 static const struct pwm_ops sandbox_pwm_ops = {
  60         .set_config     = sandbox_pwm_set_config,
  61         .set_enable     = sandbox_pwm_set_enable,
  62 };
  63
  64 static const struct udevice_id sandbox_pwm_ids[] = {
  65         { .compatible = "sandbox,pwm" },
  66         { }
  67 };
  68
  69 U_BOOT_DRIVER(warm_pwm_sandbox) = {
  70         .name           = "pwm_sandbox",
  71         .id             = UCLASS_PWM,
  72         .of_match       = sandbox_pwm_ids,
  73         .ops            = &sandbox_pwm_ops,
  74         .priv_auto_alloc_size   = sizeof(struct sandbox_pwm_priv),
  75 };