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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (c) 2015 Google, Inc
- * Written by Simon Glass <sjg@chromium.org>
- */
- #include <common.h>
- #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];
- 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_alloc_size = sizeof(struct sandbox_pwm_priv),
- };
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