Eric Lee / smarc-uboot

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drivers/pwm/sandbox_pwm.c 1.8 KB
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43b41566f   Simon Glass   dm: sandbox: pwm:... 
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  /*
   * Copyright (c) 2015 Google, Inc
   * Written by Simon Glass <sjg@chromium.org>
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  #include <common.h>
  #include <dm.h>
  #include <errno.h>
  #include <pwm.h>
  #include <asm/test.h>
  
  DECLARE_GLOBAL_DATA_PTR;
  
  enum {
  	NUM_CHANNELS	= 3,
  };
  
  struct sandbox_pwm_chan {
  	uint period_ns;
  	uint duty_ns;
  	bool enable;
5540e25ae   Kever Yang   dm: sandbox: pwm:... 
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  	bool polarity;
43b41566f   Simon Glass   dm: sandbox: pwm:... 
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  };
  
  struct sandbox_pwm_priv {
  	struct sandbox_pwm_chan chan[NUM_CHANNELS];
  };
  
  static int sandbox_pwm_set_config(struct udevice *dev, uint channel,
  				  uint period_ns, uint duty_ns)
  {
  	struct sandbox_pwm_priv *priv = dev_get_priv(dev);
  	struct sandbox_pwm_chan *chan;
  
  	if (channel >= NUM_CHANNELS)
  		return -ENOSPC;
  	chan = &priv->chan[channel];
  	chan->period_ns = period_ns;
  	chan->duty_ns = duty_ns;
  
  	return 0;
  }
  
  static int sandbox_pwm_set_enable(struct udevice *dev, uint channel,
  				  bool enable)
  {
  	struct sandbox_pwm_priv *priv = dev_get_priv(dev);
  	struct sandbox_pwm_chan *chan;
  
  	if (channel >= NUM_CHANNELS)
  		return -ENOSPC;
  	chan = &priv->chan[channel];
  	chan->enable = enable;
  
  	return 0;
  }
5540e25ae   Kever Yang   dm: sandbox: pwm:... 
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  static int sandbox_pwm_set_invert(struct udevice *dev, uint channel,
  				  bool polarity)
  {
  	struct sandbox_pwm_priv *priv = dev_get_priv(dev);
  	struct sandbox_pwm_chan *chan;
  
  	if (channel >= NUM_CHANNELS)
  		return -ENOSPC;
  	chan = &priv->chan[channel];
  	chan->polarity = polarity;
  
  	return 0;
  }
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  static const struct pwm_ops sandbox_pwm_ops = {
  	.set_config	= sandbox_pwm_set_config,
  	.set_enable	= sandbox_pwm_set_enable,
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  	.set_invert	= sandbox_pwm_set_invert,
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  };
  
  static const struct udevice_id sandbox_pwm_ids[] = {
  	{ .compatible = "sandbox,pwm" },
  	{ }
  };
  
  U_BOOT_DRIVER(warm_pwm_sandbox) = {
  	.name		= "pwm_sandbox",
  	.id		= UCLASS_PWM,
  	.of_match	= sandbox_pwm_ids,
  	.ops		= &sandbox_pwm_ops,
  	.priv_auto_alloc_size	= sizeof(struct sandbox_pwm_priv),
  };