[J-u-boot.git] / drivers / pwm / sandbox_pwm.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2015 Google, Inc
 * Written by Simon Glass <[email protected]>
 */

#include <dm.h>
#include <errno.h>
#include <pwm.h>
#include <asm/test.h>

enum {
	NUM_CHANNELS	= 3,
};

/**
 * struct sandbox_pwm_chan - a sandbox PWM channel
 *
 * @period_ns: Period of the PWM in nanoseconds
 * @duty_ns: Current duty cycle of the PWM in nanoseconds
 * @enable: true if the PWM is enabled
 * @polarity: true if the PWM polarity is active high
 */
struct sandbox_pwm_chan {
	uint period_ns;
	uint duty_ns;
	bool enable;
	bool polarity;
};

struct sandbox_pwm_priv {
	struct sandbox_pwm_chan chan[NUM_CHANNELS];
};

int sandbox_pwm_get_config(struct udevice *dev, uint channel, uint *period_nsp,
			   uint *duty_nsp, bool *enablep, bool *polarityp)
{
	struct sandbox_pwm_priv *priv = dev_get_priv(dev);
	struct sandbox_pwm_chan *chan;

	if (channel >= NUM_CHANNELS)
		return -ENOSPC;
	chan = &priv->chan[channel];
	*period_nsp = chan->period_ns;
	*duty_nsp = chan->duty_ns;
	*enablep = chan->enable;
	*polarityp = chan->polarity;

	return 0;
}

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];

	if (channel == 2) {
		/* Pretend to have some fixed period */
		chan->period_ns = 4096;
		chan->duty_ns =  duty_ns * 4096 / period_ns;
	} else {
		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;
}

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;
}

static const struct pwm_ops sandbox_pwm_ops = {
	.set_config	= sandbox_pwm_set_config,
	.set_enable	= sandbox_pwm_set_enable,
	.set_invert	= sandbox_pwm_set_invert,
};

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	= sizeof(struct sandbox_pwm_priv),
};
Commit	Line	Data
83d290c5	1	// SPDX-License-Identifier: GPL-2.0+
43b41566 SG	2	/*
	3	* Copyright (c) 2015 Google, Inc
	4	* Written by Simon Glass <[email protected]>
43b41566 SG	5	*/
43b41566 SG	6
43b41566 SG	7	#include <dm.h>
	8	#include <errno.h>
	9	#include <pwm.h>
	10	#include <asm/test.h>
	11
43b41566 SG	12	enum {
	13	NUM_CHANNELS = 3,
	14	};
	15
5d9a88f4 SG	16	/**
	17	* struct sandbox_pwm_chan - a sandbox PWM channel
	18	*
	19	* @period_ns: Period of the PWM in nanoseconds
	20	* @duty_ns: Current duty cycle of the PWM in nanoseconds
	21	* @enable: true if the PWM is enabled
	22	* @polarity: true if the PWM polarity is active high
	23	*/
43b41566 SG	24	struct sandbox_pwm_chan {
	25	uint period_ns;
	26	uint duty_ns;
	27	bool enable;
5540e25a	28	bool polarity;
43b41566 SG	29	};
	30
	31	struct sandbox_pwm_priv {
	32	struct sandbox_pwm_chan chan[NUM_CHANNELS];
	33	};
	34
5d9a88f4 SG	35	int sandbox_pwm_get_config(struct udevice dev, uint channel, uint period_nsp,
	36	uint duty_nsp, bool enablep, bool *polarityp)
	37	{
	38	struct sandbox_pwm_priv *priv = dev_get_priv(dev);
	39	struct sandbox_pwm_chan *chan;
	40
	41	if (channel >= NUM_CHANNELS)
	42	return -ENOSPC;
	43	chan = &priv->chan[channel];
	44	*period_nsp = chan->period_ns;
	45	*duty_nsp = chan->duty_ns;
	46	*enablep = chan->enable;
	47	*polarityp = chan->polarity;
	48
	49	return 0;
	50	}
	51
43b41566 SG	52	static int sandbox_pwm_set_config(struct udevice *dev, uint channel,
	53	uint period_ns, uint duty_ns)
	54	{
	55	struct sandbox_pwm_priv *priv = dev_get_priv(dev);
	56	struct sandbox_pwm_chan *chan;
	57
	58	if (channel >= NUM_CHANNELS)
	59	return -ENOSPC;
	60	chan = &priv->chan[channel];
fefa713b ANY	61
	62	if (channel == 2) {
	63	/* Pretend to have some fixed period */
	64	chan->period_ns = 4096;
	65	chan->duty_ns = duty_ns * 4096 / period_ns;
	66	} else {
	67	chan->period_ns = period_ns;
	68	chan->duty_ns = duty_ns;
	69	}
43b41566 SG	70
	71	return 0;
	72	}
	73
	74	static int sandbox_pwm_set_enable(struct udevice *dev, uint channel,
	75	bool enable)
	76	{
	77	struct sandbox_pwm_priv *priv = dev_get_priv(dev);
	78	struct sandbox_pwm_chan *chan;
	79
	80	if (channel >= NUM_CHANNELS)
	81	return -ENOSPC;
	82	chan = &priv->chan[channel];
	83	chan->enable = enable;
	84
	85	return 0;
	86	}
	87
5540e25a KY	88	static int sandbox_pwm_set_invert(struct udevice *dev, uint channel,
	89	bool polarity)
	90	{
	91	struct sandbox_pwm_priv *priv = dev_get_priv(dev);
	92	struct sandbox_pwm_chan *chan;
	93
	94	if (channel >= NUM_CHANNELS)
	95	return -ENOSPC;
	96	chan = &priv->chan[channel];
	97	chan->polarity = polarity;
	98
	99	return 0;
	100	}
	101
43b41566 SG	102	static const struct pwm_ops sandbox_pwm_ops = {
	103	.set_config = sandbox_pwm_set_config,
	104	.set_enable = sandbox_pwm_set_enable,
5540e25a	105	.set_invert = sandbox_pwm_set_invert,
43b41566 SG	106	};
	107
	108	static const struct udevice_id sandbox_pwm_ids[] = {
	109	{ .compatible = "sandbox,pwm" },
	110	{ }
	111	};
	112
	113	U_BOOT_DRIVER(warm_pwm_sandbox) = {
	114	.name = "pwm_sandbox",
	115	.id = UCLASS_PWM,
	116	.of_match = sandbox_pwm_ids,
	117	.ops = &sandbox_pwm_ops,
41575d8e	118	.priv_auto = sizeof(struct sandbox_pwm_priv),
43b41566	119	};